CB/T 3679-1995 Technical requirements for repair of marine reciprocating hydraulic steering gear

This standard specifies the repair technical requirements for marine reciprocating hydraulic steering gear, rudder control and steering mechanical equipment. This standard applies to the repair of reciprocating plunger hydraulic steering gear. CB/T 3679-1995 Technical requirements for repair of marine reciprocating hydraulic steering gear CB/T3679-1995 Standard download decompression password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CB/T3679-1995
Technical requirements for the repair of marine reciprocating hydraulic steering gear Issued on June 19, 1995
China State Shipbuilding Corporation
Implementation on April 1, 1996
Shipbuilding Industry Standard of the People's Republic of China
Technical requirements for the repair of marine reciprocating hydraulic steering gear 1 Subject content and scope of application
CB/T3679—1995
Classification number: R32
This standard specifies the technical requirements for the repair of marine reciprocating hydraulic steering gear's rudder thruster, rudder control and energy-operating mechanical equipment. This standard applies to the repair of reciprocating plunger hydraulic steering gear. 2 Reference standards
GB3452.1 Size series and tolerances of O-type rubber seals for hydraulic and pneumatic applications GB7038 Rubber materials for O-type rubber seals for general hydraulic systems GB7039 Rubber materials for seals for reciprocating motion
ZB/TR32003 Technical requirements for repair of hydraulic components for engineering ships CB/T3668 Technical requirements for brush plating of nickel and copper 3 Fault inspection before repair and repair limit regulations 3.1 Fault inspection before repair
Fault inspection before repair Refer to Figures 1 and 2. 3.1.1 Slow steering
3.1.1.1 Check whether the packing of the push steering mechanism is too tight. 3.1.1.2 Check whether the parallelism between the axis of the energy machine plunger and the guide plate is out of tolerance, and check whether there are any signs of wear on the extended surface of the plunger. Check whether the oil pump is worn and leaking.
Check whether the safety wave valve and bypass valve are not closed tightly. Check whether the storage spring of the follow-up feedback lever is broken or blocked, which affects the oil pump variable. 3.1.1.5
Check whether the relief valve port is unclean or worn, which causes abnormal overflow of the main valve port. Check whether the pilot valve port of the relief valve is unclean or not closed tightly, which causes abnormal overflow of the main valve port. Check whether the variable rod of the variable pump is improperly adjusted, which causes insufficient opening of the oil pump. Check whether the actuator spring of the steering wheel hydraulic remote control mechanism is broken or blocked, which causes the oil pump variable to be not in place. 3.1.1.10
Check whether the electrical and hydraulic components of the electro-hydraulic servo remote control mechanism are faulty, which causes the servo piston to fail to move normally. 3.1.2 No rudder
3.1.2.1 Check whether the electromagnetic reversing valve or the electro-hydraulic reversing valve is de-energized and whether the reset spring is blocked. 3.1.2.2
Check whether the relief valve is abnormally open and overflows, which causes insufficient oil supply. Check whether the bypass valve is closed. Check whether the safety wave-proof valve and bypass valve are not closed tightly. 3.1.2.4 Check whether the hydraulic or electro-hydraulic servo remote control mechanism of the steering wheel pump fails, causing the oil pump to be unable to change normally. 3.1.3
No rudder on one side
3.1.3.1 Check whether the electromagnetic coil on the corresponding side of the electromagnetic reversing valve or electro-hydraulic reversing valve is burned out and loses power. 3.1.3.2
Check whether the safety wave-proof valve on the corresponding side is not closed tightly, resulting in insufficient oil supply and inability to push the rudder. Check whether the overflow valve on the corresponding side overflows abnormally due to a fault. Approved by China State Shipbuilding Corporation on June 19, 1995 and implemented on April 1, 1996
CB/T 3679-1995
Poop control
Handwheel emergency control
Hydraulic remote torque control,
Figure 1 Variable pump reciprocating plunger hydraulic energy machine
Electro-hydraulic
Servo cylinder control
1--Hydraulic remote control mechanism actuator; 2-plunger; 3-following feedback rod; 4-storage spring; 5-energy column; 6-manual bypass valve; 7-safety anti-wave valve; 8-cylinder; 9-variable pump; 10-adjusting nut; 11-air release valve; 12-energy angle indicator Note: A-control point; B-feedback point; C-variable point. 3.1.4 Rudder
CB/T3679-1995
Figure 2 Fixed-base pump reciprocating plunger hydraulic energy machine device manual bypass valve; 2---oil cylinder; 3--plunger; 4--safety anti-wave valve; 5-oil tank; 6 hydraulic control check valve; 7-hydraulic reversing valve; 8-main oil pump; 9--overflow valve: 10--filter; 11-electromagnetic reversing valve3.1.4.1 Check whether the hydraulic control check valve is not closed tightly, resulting in the system not being able to hydraulically self-lock in time. 2 Check whether the safety anti-wave valve is not closed tightly. 3.1.4.2
Check whether the bypass valve is not closed tightly.
Check whether the zero point of the operating energy is synchronized with the zero point of the tracking feedback. 3.1.4.4
3.1.5 Rudder without air
Check whether the push-rudder mechanism has air.
Check whether the pumps, valves, joints, and instruments of the steering equipment are not tightly sealed, leaking oil, or sucking air. Check whether the steering equipment has air storage and oil leakage. 3.1.6 Too high temperature
Check whether the valve port of the overflow valve is unclean, causing throttling heating. Check whether the safety wave-proof valve, hydraulically controlled one-way valve, and reversing valve are not tightly closed, causing throttling heating. Check whether the thrust mechanism has abnormal friction heating. Check whether the transmission axis of the oil pump is misaligned, causing heating. Check whether the hydraulic system has air storage, causing compression disturbance and oil heating. Check whether the oil level in the oil tank is too low and the suction port is not deep enough, causing oil surface disturbance and heating. 3.1.7 Noise
Check whether the sealing packing of the push-steering mechanism is pressed too tightly. Check whether the thrust, steering, steering mechanism and its pipeline accessories are not tightly sealed, causing air storage in the system. Check whether the valve parts have unnecessary throttling noise due to unclean hydraulic oil. Check whether the oil level in the oil tank is too low, and the suction port is not deep enough, causing the oil surface to disturb and produce noise. 3.1.8 Vibration
CB/T3679-1995
Check whether the fasteners of the push-rudder mechanism are loose. Check whether the clearance of the motion coupling of the push-rudder mechanism is too large, causing knocking and vibration. Check whether the transmission axis of the oil pump is misaligned. Check whether the pipe clamps of the hydraulic pipeline are improperly set or loose, causing pipe vibration. Check whether the push-rudder mechanism or pipeline has water hammer due to air storage, causing pipeline vibration. Check whether the handle or rudder bar sinks or bends, causing excessive load and causing vibration of the safety anti-wave valve. 3.2 Repair limit regulations
The change in the distance between the center line of the push-rudder mechanism cylinder and the guide plate shall not exceed 1/2 of the clearance between the plunger and the bushing. The increment of the clearance between the slider and the guide plate shall not be greater than 0.2mm. The clearance between the crosshead trunnion bushing and the trunnion shall not be greater than 2 times the maximum clearance of its H8/f7 fit. The clearance between the tiller handle and the crosshead bushing shall not be greater than twice the maximum clearance of its H8/f7 combination. The clearance between the fork or fork slide and the roller (roller ring) shall not exceed 0.8mm. The clearance between the plunger and the cylinder bushing shall not exceed twice the maximum clearance of its H8/f7 combination. The chrome plating of the plunger shall not have local peeling, corrosion pitting, and the base shall not be exposed. The handle shall not sink 0.5mm with the rudder bar.
The parallelism error of the center line of the four-cylinder parallel opposed cylinder shall not exceed 0.04mm/m. The coaxiality error of the center line of the two-cylinder opposed cylinder shall not exceed 0.12mm. The running angle of the hydraulic or electro-hydraulic control mechanism shall not exceed 2°. The synchronization error of the zero position indication angle of the push steering mechanism and the control mechanism shall not exceed ±1°. 3.2.13
The system shall not have abnormal sounds.
The system oil temperature shall not exceed 65℃.
If the weight of solid particles in the system oil exceeds the limit value specified in ZB/TR32003, the hydraulic oil should be replaced. Repair technical requirements
Repair of vulnerable parts of thrust mechanism
4.1.1 Replacement of materials
Parts materials are generally replaced according to the original material or according to Table 1. Table 1 Replacement materials for wearing parts
Part name
Sealing ring
Material brand
ZG230-450
ZG270-500
ZG 270-500
ZCuA19Mn2
ZG 230-450
ZG 270-500
Standard number
GB11352—89
GB699-88
GB11352—89
GB1176-87
GB7039-86
GB11352—89
GB 699-88
GB11352--89
GB69988
Technical requirements
Annealing after casting
Normalizing after forging
Annealing after casting
Normalizing after forging
Annealing after casting
Part name
Shift fork pin
CB/T3679-1995
Continued table 1
Material brand
ZCuAl9Mn2
Standard number
GB1176—87
YB9-68
GB3077—88
Technical requirements
Quenching and tempering
4.1.2 Plunger
4.1.2.1 If the chrome layer on the surface of the crosshead and fork servo plungers is partially peeled off, corroded and pitted, it can be repaired by rapid electroplating and other methods. The pretreatment before brush plating, brush plating process and quality shall comply with the provisions of CB/T3668. 4.1.2.2 The processing section and the reserved section before brush plating shall have a smooth transition. The brush plating layer less than 0.2mm can be composed of a transition layer and a working layer; the brush plating layer greater than 0.2mm shall be composed of a transition layer, an intermediate layer and a working layer. The thickness of the brush plating layer shall not exceed 0.4mm. 4.1.2.3 If the surface accuracy and shape and position tolerance of the chrome layer after brush plating meet the requirements and there are no defects on the surface, grinding is not required. 4.1.2.4 If the processing length for removing defects exceeds 250mm, consideration should be given to removing the entire chrome layer and re-plating. 4.1.2.5 The dimensional tolerance, surface roughness and shape and position tolerance of the plunger shall comply with the requirements of Figure 3. Grade A
Figure 3 Plunger
4.1.3 Oil Cylinder and Bushing
4.1.3.1 If the oil cylinder has oil leakage defects, the cast steel body can be repaired by electric welding. It should be annealed if necessary; the cast iron body should not be welded, but it can be filled with plastic resin and other materials if the strength is not affected after the defects are removed. The repaired body should pass the tightness pressure test. The test pressure is 1.5 times the working pressure.
4.1.3.2 If the oil cylinder bushing is worn beyond the tolerance, it should be replaced. Spraying repair is allowed for large diameter copper bushings. The dimensional tolerance, surface roughness, and geometric tolerance of the oil mark T and bushing should meet the requirements of Figure 4 and Figure 5. 4.1.3.3
Figure 4 Oil Cylinder
4.1.4 Crosshead Trunnion
CB/T 3679--1995
Figure 5 Oil Cylinder Bushing
4.1.4.1 The wear of the crosshead trunnion can be repaired by surfacing, rapid electroplating and low-temperature iron plating. 4.1.4.2 When the wear of the crosshead trunnion bushing exceeds the tolerance, it should generally be replaced. 4.1.4.3 The dimensional tolerance, surface roughness, and geometric tolerance of the crosshead trunnion and bushing shall comply with the requirements of Figures 6 and 7. Two places
8 level AB
Figure 6 Crosshead trunnion
4.1.5 Handle, roller and slider
CB/T3679—1995
Figure 7 Trunnion bushing
4.1.5.1 If the wear of the crosshead steering gear handle exceeds the tolerance, it can be repaired by surfacing welding or other methods. 4.1.5.2 If the wear of the fork groove of the fork handle exceeds the tolerance, it can be repaired by adding a hardened guide plate. The hardness of the hardened guide plate should be lower than the hardness of the roller by HRC2~3.
4.1.5.3 The dimensional tolerance, surface roughness, form and position tolerance of the crosshead steering gear handle and the fork tiller should meet the requirements of Figure 8 and Figure 9 respectively.
O17 grade
Figure 8 Crosshead steering gear tiller
CB/T3679-1995
Figure 9 Fork-type tiller
4.1.5.4 When the slider or roller of the fork-type tiller is worn beyond tolerance, it should be matched with the fork groove or hardened guide plate for processing and replacement, and the matching clearance is 0.2~0.5mm.
4.1.6 Guide plate and slide plate
4.1.6.1 When the inner and outer slide plates are worn beyond tolerance with the guide plate, they can be repaired by processing the inner slide plate and adding gaskets under the condition that the strength allows. The inner slide plate after processing should be scraped and matched with the guide plate, requiring that the contact point per square centimeter is not less than 1 point. 4.1.6.2 It is allowed to add or remove gaskets between the inner and outer slide plates to adjust the clearance. 4.1.7 Seals
The sealing surface of the rubber seal ring of the thrust cylinder shall be free of visible defects such as scratches, and shall have good elasticity and no plastic deformation on the cross section. 4.1.7.1#
4.1.7.2 The newly replaced seal ring shall be made of medium hardness oil-resistant rubber, and its appearance quality and physical and mechanical properties shall comply with the relevant provisions of GB7039.
4.2 Repair and installation of components
4.2.1 The joint surfaces of the two plungers of the cross-head push steering device shall be tightly matched with not less than 20% of the total number of reaming screws, and not less than 2. 4.2.2 The coaxiality tolerance of the two plungers after connection shall be less than or equal to the 8-level position tolerance. 4.2.3 The parallelism tolerance between the axis of the two plungers after connection and the slider installation surface of the plunger shall be less than or equal to 0.05mm/m. 4.2.4 The coaxiality tolerance of the center line of the opposed cylinder shall be less than or equal to the 8-level position tolerance requirement. 4.2.5 After the cylinder is connected to the guide plate, the parallelism tolerance should be less than or equal to 0.03mm/m. 4.2.6 After the crosshead type thrust mechanism is installed and positioned, the installation gap between the guide plate and the slider is detected within the full stroke, and the thickness of the feeler gauge that can be inserted should be less than or equal to 0.1mm. This gap can be adjusted with a gasket, and it must be ensured that the plunger slider can push against the guide plate. 4.2.7 The front, rear, left and right limit blocks of the thrust mechanism should be repositioned and tightened, and the maximum energy angle limit should not exceed 37°. 4.2.8 The gap between the fork type energy handle groove and the roller should be less than or equal to 0.5mm. 4.2.9 The parallelism tolerance of the center lines of the two parallel thrust cylinders of the four cylinders should be less than or equal to 0.05mm/m. The verticality tolerance of the center line of the cylinder and the center line of the energy rod shaft hole should be less than or equal to 0.08mm/m. 4.2.10 After the
plate is pushed against the guide plate, it should be ensured that there is a gap between the plunger and the bushing. The values ​​in Table 2 are recommended for the clearance between the plunger and the bushing. Table 2 Clearance between the plunger and the bushing
Plunger diameter
≤120
>120~180
>180~260
>260~350
Assembly clearance
0.12~0.20
0.15~0.25
0.19~0.30
0.26~0.35
Limit clearance
CB/T3679--1995
4.2.12 The matching accuracy of the main parts of the thrust mechanism shall comply with the requirements of Figures 10 and 11. o.8
Hydraulic energy machine push mechanism
1--Cylinder; 2--Bushing; 3--Seal ring; 4-Plunger; 5 Guide plate; 6-Slide plate; 7-Crosshead; 8-Bushing 4.3 Repair of energy control equipment
CB/T3679-1995
Figure 11 Fork and roller type hydraulic energy machine push steering mechanism 1-Guide plate; 2-Rolling ring; 3-Bushing; 4-Pin shaft; 5-Seal ring; 6-Bushing; 7-Plunger This energy control equipment repair includes pumps, valves, pipelines, working oil and other parts. 3.2y
4.3.1 Before the steering gear is overhauled, the hydraulic oil pollution should be checked by sampling. The sampling container should be very clean and no external pollution should be caused during the sampling operation. The sampling should be done by draining oil from the oil return port or from the spare pipe joint during the system operation. The oil drain pipe joint should be kept clean and not cause contamination.
4.3.2 If the contamination of the sampled oil reaches the specified limit, the hydraulic oil should be replaced. 4.3.3 Before replacing the hydraulic oil in the system, the pump, valve, oil tank and other detachable accessories should be cleaned. 4.3.4 The pipe fittings should be pressure flushed according to the loop, and the precision components such as pumps, valves and instruments should be bypassed during flushing. 4.3.5 When the system is filled with new oil, filters with different filtration accuracies should be selected depending on the type of main oil pump. It is recommended to select according to Table 3. Table 3 System oil filtration accuracy
Main oil pump type
Gear pump
Vane pump
Piston pump
Filtration accuracy, μm
4.3.6 The tortuosity and offset of the coupling flange between the oil pump and the motor in the free state shall comply with the provisions of Table 4. 102 If the wear of the oil cylinder bushing exceeds the tolerance, it should generally be replaced. For large diameter copper bushings, spray repair is allowed. The dimensional tolerance, surface roughness, form and position tolerance of the oil mark T and bushing shall comply with the requirements of Figure 4 and Figure 5. 4.1.3.3
Figure 4 Oil cylinder
4.1.4 Crosshead trunnion
CB/T 3679--1995
Figure 5 Oil cylinder bushing
4.1.4.1 The wear of the crosshead trunnion can be repaired by surfacing, rapid electroplating and low-temperature iron plating. 4.1.4.2 If the wear of the crosshead trunnion bushing exceeds the tolerance, it should generally be replaced. 4.1.4.3 The dimensional tolerance, surface roughness, form and position tolerance of the crosshead trunnion and bushing shall comply with the requirements of Figure 6 and Figure 7. Two places
8 level AB
Figure 6 Crosshead trunnion
4.1.5 Handle, roller and slider
CB/T3679—1995
Figure 7 Trunnion bushing
4.1.5.1 If the wear of the crosshead steering gear handle exceeds the tolerance, it can be repaired by surfacing welding or other methods. 4.1.5.2 If the wear of the fork groove of the fork handle exceeds the tolerance, it can be repaired by adding a hardened guide plate. The hardness of the hardened guide plate should be lower than the hardness of the roller by HRC2~3.
4.1.5.3 The dimensional tolerance, surface roughness, form and position tolerance of the crosshead steering gear handle and the fork tiller should meet the requirements of Figure 8 and Figure 9 respectively.
O17 grade
Figure 8 Crosshead steering gear tiller
CB/T3679-1995
Figure 9 Fork-type tiller
4.1.5.4 When the slider or roller of the fork-type tiller is worn beyond tolerance, it should be matched with the fork groove or hardened guide plate for processing and replacement, and the matching clearance is 0.2~0.5mm.
4.1.6 Guide plate and slide plate
4.1.6.1 When the inner and outer slide plates are worn beyond tolerance with the guide plate, they can be repaired by processing the inner slide plate and adding gaskets under the condition that the strength allows. The inner slide plate after processing should be scraped and matched with the guide plate, requiring that the contact point per square centimeter is not less than 1 point. 4.1.6.2 It is allowed to add or remove gaskets between the inner and outer slide plates to adjust the clearance. 4.1.7 Seals
The sealing surface of the rubber seal ring of the thrust cylinder shall be free of visible defects such as scratches, and shall have good elasticity and no plastic deformation on the cross section. 4.1.7.1#
4.1.7.2 The newly replaced seal ring shall be made of medium hardness oil-resistant rubber, and its appearance quality and physical and mechanical properties shall comply with the relevant provisions of GB7039.
4.2 Repair and installation of components
4.2.1 The joint surfaces of the two plungers of the cross-head push steering device shall be tightly matched with not less than 20% of the total number of reaming screws, and not less than 2. 4.2.2 The coaxiality tolerance of the two plungers after connection shall be less than or equal to the 8-level position tolerance. 4.2.3 The parallelism tolerance between the axis of the two plungers after connection and the slider installation surface of the plunger shall be less than or equal to 0.05mm/m. 4.2.4 The coaxiality tolerance of the center line of the opposed cylinder shall be less than or equal to the 8-level position tolerance requirement. 4.2.5 After the cylinder is connected to the guide plate, the parallelism tolerance should be less than or equal to 0.03mm/m. 4.2.6 After the crosshead type thrust mechanism is installed and positioned, the installation gap between the guide plate and the slider is detected within the full stroke, and the thickness of the feeler gauge that can be inserted should be less than or equal to 0.1mm. This gap can be adjusted with a gasket, and it must be ensured that the plunger slider can push against the guide plate. 4.2.7 The front, rear, left and right limit blocks of the thrust mechanism should be repositioned and tightened, and the maximum energy angle limit should not exceed 37°. 4.2.8 The gap between the fork type energy handle groove and the roller should be less than or equal to 0.5mm. 4.2.9 The parallelism tolerance of the center lines of the two parallel thrust cylinders of the four cylinders should be less than or equal to 0.05mm/m. The verticality tolerance of the center line of the cylinder and the center line of the energy rod shaft hole should be less than or equal to 0.08mm/m. 4.2.10 After the
plate is pushed against the guide plate, it should be ensured that there is a gap between the plunger and the bushing. The values ​​in Table 2 are recommended for the clearance between the plunger and the bushing. Table 2 Clearance between plunger and bushing
Plunger diameter
≤120
>120~180
>180~260
>260~350
Assembly clearance
0.12~0.20
0.15~0.25
0.19~0.30
0.26~0.35
Limit clearance
CB/T3679--1995
4.2.12 The matching accuracy of the main parts of the thrust mechanism shall comply with the requirements of Figures 10 and 11. o.8
Hydraulic energy machine push mechanism
1--Cylinder; 2--Bushing; 3--Seal ring; 4-Plunger; 5 Guide plate; 6-Slide plate; 7-Crosshead; 8-Bushing 4.3 Repair of energy control equipment
CB/T3679-1995
Figure 11 Fork and roller type hydraulic energy machine push steering mechanism 1-Guide plate; 2-Rolling ring; 3-Bushing; 4-Pin shaft; 5-Seal ring; 6-Bushing; 7-Plunger This energy control equipment repair includes pumps, valves, pipelines, working oil and other parts. 3.2y
4.3.1 Before the steering gear is overhauled, the hydraulic oil pollution should be checked by sampling. The sampling container should be very clean and no external pollution should be caused during the sampling operation. The sampling should be done by draining oil from the oil return port or from the spare pipe joint during the system operation. The oil drain pipe joint should be kept clean and not cause contamination.
4.3.2 If the contamination of the sampled oil reaches the specified limit, the hydraulic oil should be replaced. 4.3.3 Before replacing the hydraulic oil in the system, the pump, valve, oil tank and other detachable accessories should be cleaned. 4.3.4 The pipe fittings should be pressure flushed according to the loop, and the precision components such as pumps, valves and instruments should be bypassed during flushing. 4.3.5 When the system is filled with new oil, filters with different filtration accuracies should be selected depending on the type of main oil pump. It is recommended to select according to Table 3. Table 3 System oil filtration accuracy
Main oil pump type
Gear pump
Vane pump
Piston pump
Filtration accuracy, μm
4.3.6 The tortuosity and offset of the coupling flange between the oil pump and the motor in the free state shall comply with the provisions of Table 4. 102 If the wear of the oil cylinder bushing exceeds the tolerance, it should generally be replaced. For large diameter copper bushings, spray repair is allowed. The dimensional tolerance, surface roughness, form and position tolerance of the oil mark T and bushing shall comply with the requirements of Figure 4 and Figure 5. 4.1.3.3
Figure 4 Oil cylinder
4.1.4 Crosshead trunnion
CB/T 3679--1995
Figure 5 Oil cylinder bushing
4.1.4.1 The wear of the crosshead trunnion can be repaired by surfacing, rapid electroplating and low-temperature iron plating. 4.1.4.2 If the wear of the crosshead trunnion bushing exceeds the tolerance, it should generally be replaced. 4.1.4.3 The dimensional tolerance, surface roughness, form and position tolerance of the crosshead trunnion and bushing shall comply with the requirements of Figure 6 and Figure 7. Two places
8 level AB
Figure 6 Crosshead trunnion
4.1.5 Handle, roller and slider
CB/T3679—1995
Figure 7 Trunnion bushing
4.1.5.1 If the wear of the crosshead steering gear handle exceeds the tolerance, it can be repaired by surfacing welding or other methods. 4.1.5.2 If the wear of the fork groove of the fork handle exceeds the tolerance, it can be repaired by adding a hardened guide plate. The hardness of the hardened guide plate should be lower than the hardness of the roller by HRC2~3.
4.1.5.3 The dimensional tolerance, surface roughness, form and position tolerance of the crosshead steering gear handle and the fork tiller should meet the requirements of Figure 8 and Figure 9 respectively.
O17 grade
Figure 8 Crosshead steering gear tiller
CB/T3679-1995
Figure 9 Fork-type tiller
4.1.5.4 When the slider or roller of the fork-type tiller is worn beyond tolerance, it should be matched with the fork groove or hardened guide plate for processing and replacement, and the matching clearance is 0.2~0.5mm.
4.1.6 Guide plate and slide plate
4.1.6.1 When the inner and outer slide plates are worn beyond tolerance with the guide plate, they can be repaired by processing the inner slide plate and adding gaskets under the condition that the strength allows. The inner slide plate after processing should be scraped and matched with the guide plate, requiring that the contact point per square centimeter is not less than 1 point. 4.1.6.2 It is allowed to add or remove gaskets between the inner and outer slide plates to adjust the clearance. 4.1.7 Seals
The sealing surface of the rubber seal ring of the thrust cylinder shall be free of visible defects such as scratches, and shall have good elasticity and no plastic deformation on the cross section. 4.1.7.1#
4.1.7.2 The newly replaced seal ring shall be made of medium hardness oil-resistant rubber, and its appearance quality and physical and mechanical properties shall comply with the relevant provisions of GB7039.
4.2 Repair and installation of components
4.2.1 The joint surfaces of the two plungers of the cross-head push steering device shall be tightly matched with not less than 20% of the total number of reaming screws, and not less than 2. 4.2.2 The coaxiality tolerance of the two plungers after connection shall be less than or equal to the 8-level position tolerance. 4.2.3 The parallelism tolerance between the axis of the two plungers after connection and the slider installation surface of the plunger shall be less than or equal to 0.05mm/m. 4.2.4 The coaxiality tolerance of the center line of the opposed cylinder shall be less than or equal to the 8-level position tolerance requirement. 4.2.5 After the cylinder is connected to the guide plate, the parallelism tolerance should be less than or equal to 0.03mm/m. 4.2.6 After the crosshead type thrust mechanism is installed and positioned, the installation gap between the guide plate and the slider is detected within the full stroke, and the thickness of the feeler gauge that can be inserted should be less than or equal to 0.1mm. This gap can be adjusted with a gasket, and it must be ensured that the plunger slider can push against the guide plate. 4.2.7 The front, rear, left and right limit blocks of the thrust mechanism should be repositioned and tightened, and the maximum energy angle limit should not exceed 37°. 4.2.8 The gap between the fork type energy handle groove and the roller should be less than or equal to 0.5mm. 4.2.9 The parallelism tolerance of the center lines of the two parallel thrust cylinders of the four cylinders should be less than or equal to 0.05mm/m. The verticality tolerance of the center line of the cylinder and the center line of the energy rod shaft hole should be less than or equal to 0.08mm/m. 4.2.10 After the
plate is pushed against the guide plate, it should be ensured that there is a gap between the plunger and the bushing. The values ​​in Table 2 are recommended for the clearance between the plunger and the bushing. Table 2 Clearance between the plunger and the bushing
Plunger diameter
≤120
>120~180
>180~260
>260~350Www.bzxZ.net
Assembly clearance
0.12~0.20
0.15~0.25
0.19~0.30
0.26~0.35
Limit clearance
CB/T3679--1995
4.2.12 The matching accuracy of the main parts of the thrust mechanism shall comply with the requirements of Figures 10 and 11. o.8
Hydraulic energy machine push mechanism
1--Cylinder; 2--Bushing; 3--Seal ring; 4-Plunger; 5 Guide plate; 6-Slide plate; 7-Crosshead; 8-Bushing 4.3 Repair of energy control equipment
CB/T3679-1995
Figure 11 Fork and roller type hydraulic energy machine push steering mechanism 1-Guide plate; 2-Rolling ring; 3-Bushing; 4-Pin shaft; 5-Seal ring; 6-Bushing; 7-Plunger This energy control equipment repair includes pumps, valves, pipelines, working oil and other parts. 3.2y
4.3.1 Before the steering gear is overhauled, the hydraulic oil pollution should be checked by sampling. The sampling container should be very clean and no external pollution should be caused during the sampling operation. The sampling should be done by draining oil from the oil return port or from the spare pipe joint during the system operation. The oil drain pipe joint should be kept clean and not cause contamination.
4.3.2 If the contamination of the sampled oil reaches the specified limit, the hydraulic oil should be replaced. 4.3.3 Before replacing the hydraulic oil in the system, the pump, valve, oil tank and other detachable accessories should be cleaned. 4.3.4 The pipe fittings should be pressure flushed according to the loop, and the precision components such as pumps, valves and instruments should be bypassed during flushing. 4.3.5 When the system is filled with new oil, filters with different filtration accuracies should be selected depending on the type of main oil pump. It is recommended to select according to Table 3. Table 3 System oil filtration accuracy
Main oil pump type
Gear pump
Vane pump
Piston pump
Filtration accuracy, μm
4.3.6 The tortuosity and offset of the coupling flange between the oil pump and the motor in the free state shall comply with the provisions of Table 4. 102 The coaxial tolerance of the two plungers after connection should be less than or equal to the 8th level position tolerance. 4.2.3 The parallelism tolerance of the axis of the two plungers after connection and the slider installation surface of the plunger should be less than or equal to 0.05mm/m. 4.2.4 The coaxiality tolerance of the center line of the opposed oil cylinder should be less than or equal to the 8th level position tolerance requirement. 4.2.5 After the oil cylinder is connected to the guide plate, its parallelism tolerance should be less than or equal to 0.03mm/m. 4.2.6 After the crosshead type thrust mechanism is installed and positioned, the installation gap between the guide plate and the slider is detected within the full stroke. The thickness of the feeler gauge that can be inserted should be less than or equal to 0.1mm. This gap can be adjusted with a gasket, and it must be ensured that the plunger slider can push against the guide plate. 4.2.7 The front, rear, left and right limit blocks of the thrust mechanism should be repositioned and tightened, and the maximum energy angle limit should be ensured not to exceed 37°. 4.2.8 The gap between the fork type energy handle groove and the roller should be less than or equal to 0.5mm. 4.2.9 The tolerance of the parallelism of the center lines of the two thrust cylinders in parallel should be less than or equal to 0.05mm/m. The tolerance of the verticality between the center line of the cylinder and the center line of the energy rod shaft hole should be less than or equal to 0.08mm/m. 4.2.10 After the
plate is pushed against the guide plate, it should be ensured that there is a gap between the plunger and the bushing. The clearance between the plunger and the bushing is recommended to use the value in Table 2. Table 2 Assembly clearance between plunger and bushing
Plunger diameter
≤120
>120~180
>180~260
>260~350
Assembly clearance
0.12~0.20
0.15~0.25
0.19~0.30
0.26~0.35
Limit clearance
CB/T3679--1995
4.2.12 The matching accuracy of the main parts of the thrust mechanism shall comply with the requirements of Figures 10 and 11. o.8
Hydraulic energy machine push mechanism
1--Cylinder; 2--Bushing; 3--Seal ring; 4-Plunger; 5 Guide plate; 6-Slide plate; 7-Crosshead; 8-Bushing 4.3 Repair of energy control equipment
CB/T3679-1995
Figure 11 Fork and roller type hydraulic energy machine push steering mechanism 1-Guide plate; 2-Rolling ring; 3-Bushing; 4-Pin shaft; 5-Seal ring; 6-Bushing; 7-Plunger This energy control equipment repair includes pumps, valves, pipelines, working oil and other parts. 3.2y
4.3.1 Before the steering gear is overhauled, the hydraulic oil pollution should be checked by sampling. The sampling container should be very clean and no external pollution should be caused during the sampling operation. The sampling should be done by draining oil from the oil return port or from the spare pipe joint during the system operation. The oil drain pipe joint should be kept clean and not cause contamination.
4.3.2 If the contamination of the sampled oil reaches the specified limit, the hydraulic oil should be replaced. 4.3.3 Before replacing the hydraulic oil in the system, the pump, valve, oil tank and other detachable accessories should be cleaned. 4.3.4 The pipe fittings should be pressure flushed according to the loop, and the precision components such as pumps, valves and instruments should be bypassed during flushing. 4.3.5 When the system is filled with new oil, filters with different filtration accuracies should be selected depending on the type of main oil pump. It is recommended to select according to Table 3. Table 3 System oil filtration accuracy
Main oil pump type
Gear pump
Vane pump
Piston pump
Filtration accuracy, μm
4.3.6 The tortuosity and offset of the coupling flange between the oil pump and the motor in the free state shall comply with the provisions of Table 4. 102 The coaxial tolerance of the two plungers after connection should be less than or equal to the 8th level position tolerance. 4.2.3 The parallelism tolerance of the axis of the two plungers after connection and the slider installation surface of the plunger should be less than or equal to 0.05mm/m. 4.2.4 The coaxiality tolerance of the center line of the opposed oil cylinder should be less than or equal to the 8th level position tolerance requirement. 4.2.5 After the oil cylinder is connected to the guide plate, its parallelism tolerance should be less than or equal to 0.03mm/m. 4.2.6 After the crosshead type thrust mechanism is installed and positioned, the installation gap between the guide plate and the slider is detected within the full stroke. The thickness of the feeler gauge that can be inserted should be less than or equal to 0.1mm. This gap can be adjusted with a gasket, and it must be ensured that the plunger slider can push against the guide plate. 4.2.7 The front, rear, left and right limit blocks of the thrust mechanism should be repositioned and tightened, and the maximum energy angle limit should be ensured not to exceed 37°. 4.2.8 The gap between the fork type energy handle groove and the roller should be less than or equal to 0.5mm. 4.2.9 The tolerance of the parallelism of the center lines of the two thrust cylinders in parallel should be less than or equal to 0.05mm/m. The tolerance of the verticality between the center line of the cylinder and the center line of the energy rod shaft hole should be less than or equal to 0.08mm/m. 4.2.10 After the
plate is pushed against the guide plate, it should be ensured that there is a gap between the plunger and the bushing. The clearance between the plunger and the bushing is recommended to use the value in Table 2. Table 2 Assembly clearance between plunger and bushing
Plunger diameter
≤120
>120~180
>180~260
>260~350
Assembly clearance
0.12~0.20
0.15~0.25
0.19~0.30
0.26~0.35
Limit clearance
CB/T3679--1995
4.2.12 The matching accuracy of the main parts of the thrust mechanism shall comply with the requirements of Figures 10 and 11. o.8
Hydraulic energy machine push mechanism
1--Cylinder; 2--Bushing; 3--Seal ring; 4-Plunger; 5 Guide plate; 6-Slide plate; 7-Crosshead; 8-Bushing 4.3 Repair of energy control equipment
CB/T3679-1995
Figure 11 Fork and roller type hydraulic energy machine push steering mechanism 1-Guide plate; 2-Rolling ring; 3-Bushing; 4-Pin shaft; 5-Seal ring; 6-Bushing; 7-Plunger This energy control equipment repair includes pumps, valves, pipelines, working oil and other parts. 3.2y
4.3.1 Before the steering gear is overhauled, the hydraulic oil pollution should be checked by sampling. The sampling container should be very clean and no external pollution should be caused during the sampling operation. The sampling should be done by draining oil from the oil return port or from the spare pipe joint during the system operation. The oil drain pipe joint should be kept clean and not cause contamination.
4.3.2 If the contamination of the sampled oil reaches the specified limit, the hydraulic oil should be replaced. 4.3.3 Before replacing the hydraulic oil in the system, the pump, valve, oil tank and other detachable accessories should be cleaned. 4.3.4 The pipe fittings should be pressure flushed according to the loop, and the precision components such as pumps, valves and instruments should be bypassed during flushing. 4.3.5 When the system is filled with new oil, filters with different filtration accuracies should be selected depending on the type of main oil pump. It is recommended to select according to Table 3. Table 3 System oil filtration accuracy
Main oil pump type
Gear pump
Vane pump
Piston pump
Filtration accuracy, μm
4.3.6 The tortuosity and offset of the coupling flange between the oil pump and the motor in the free state shall comply with the provisions of Table 4. 10
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