Flexible digitization assembly method for safety valve elastic check ring of hydraulic plunger pump

Abstract

The present application relates to the technical field of hydraulic plunger pump repair, and particularly relates to a flexible digital assembly method for a safety valve elastic baffle ring of a hydraulic plunger pump, which comprises the following specific steps: S1, installing the elastic baffle ring; S2, installing the tire; S3, installing the fixing table; S4, resetting the digital dial gauge; S5, calculating the thickness; S6, taking out the component; S7, checking; S8, splicing and assembling; S9, positioning the shell; S10, positioning the groove; S11, horizontally placing the elastic baffle ring; S12, corresponding to the groove; S13, flexibly assembling by the servo press; S14, checking the press-fitting curve; S15, rotating the spring clamp; S16, re-measuring; By controlling the assembly gap of the elastic baffle ring, controlling the servo press down parameters, and controlling the compression amount of the elastic baffle ring, the flexible digital assembly of the elastic baffle ring is realized, so that the assembly quality and efficiency of the elastic baffle ring are improved, and the maintenance quality and reliability of the hydraulic plunger pump are improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic piston pump repair technology, specifically a flexible digital assembly method for the elastic retaining ring of a hydraulic piston pump safety valve. Background Technology

[0002] The safety valve of a hydraulic piston pump is a mechanism that, during pump operation, opens when the return oil pressure in the pump source system's housing cavity rises to a certain limit, allowing oil to enter the pump inlet and thus relieving the pressure inside the housing cavity. The safety valve mainly consists of a spring retaining ring, adjusting washer, valve seat, valve, spring, and support, and is installed in the safety valve mounting hole on the housing. The mechanism's composition and installation sequence are detailed below. Figure 1 In the safety valve mechanism, the components are mainly fixed by elastic retaining rings. The elastic retaining rings are steel parts that mainly bear the axial impact force and radial compressive force when the safety valve is opened and closed. In addition, when the safety valve is not open, the elastic retaining rings will also bear the axial impact force and radial compressive force caused by the fretting of the valve seat.

[0003] Due to the complex operating conditions at the elastic retaining ring, its assembly quality is particularly important. Historically, there have been numerous instances of elastic retaining ring fracture leading to hydraulic piston pump wear, severely impacting aviation quality and safety. Furthermore, traditional hydraulic piston pump repair methods using calipers to compress the elastic retaining ring during assembly can easily cause radial over-compression and axial misalignment, damaging the retaining ring and leaving original defects, resulting in substandard assembly and affecting assembly quality and efficiency. Therefore, a flexible digital assembly method for the elastic retaining ring of the hydraulic piston pump safety valve was designed, which can effectively improve the assembly quality and efficiency of the elastic retaining ring and enhance the maintenance quality of the hydraulic piston pump. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes a flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve.

[0005] A flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve includes the following specific steps:

[0006] S1. Install the elastic retaining ring: Place the valve seat into the safety valve mounting hole, and use snap ring pliers to install the process elastic retaining ring into the snap ring groove of the safety valve mounting hole;

[0007] S2. Install the expansion tire: Insert the expansion tire from the gap measuring fixture into the valve seat hole, and tighten the tightening nut to fix the expansion tire in the valve seat hole;

[0008] S3. Install the fixed platform: Install the gap measuring fixture onto the upper end face of the housing and tighten the nut to fix the fixed platform on the housing. During the installation process, put the measuring rod into the U-shaped opening of the rocker arm and make the end face of the measuring rod contact the digital dial indicator.

[0009] S4. Zeroing the digital dial indicator: Raise the rocker arm to bring the measuring rod to the lowest point and return the digital dial indicator to zero. Press the rocker arm down to bring the measuring rod to the highest point to obtain the travel distance D of the valve seat in the safety valve mounting hole. After confirmation, upload the travel distance value through the digital dial indicator.

[0010] S5. Calculate the thickness using the formula T = D - 0.1 +0.05 Use a digital micrometer to select and adjust the thickness T of the washers to ensure that the assembly clearance G meets the requirement of 0.05~0.10mm;

[0011] S6. Remove components: Remove the clearance measuring fixture, and take out the process elastic retaining ring and valve seat;

[0012] S7. Inspection: Use a scribing needle to install the sealing ring into the sealing ring groove of the valve seat. Slide the sealing ring around the circumference with the scribing needle to check that the sealing ring assembly is not twisted.

[0013] S8. Assembly: Assemble the support column, spring, selected adjusting washer 1 and adjusting washer 2, valve, valve seat, and selected adjusting washer in sequence, and place them into the safety valve mounting hole with the support column inside and the adjusting washer 3 outside.

[0014] S9. Housing positioning: Place the hydraulic piston pump housing on the press base to position the housing. The bottom of the housing is fixed to the intermediate positioning shaft and positioning pin on the press base. Tighten the elbow clamp to prevent the housing from shaking.

[0015] S10. Groove positioning: Place the elastic retaining ring guide fixture on the safety valve mounting hole. The boss on the elastic retaining ring guide fixture should correspond to the groove of the hydraulic piston pump housing to prevent the elastic retaining ring guide fixture from moving in a cross-sectional manner.

[0016] S11. Horizontally place the elastic retaining ring: Place the elastic retaining ring 1 horizontally in the elastic retaining ring guide fixture;

[0017] S12, Corresponding groove: Loosen the fixing handle, pull up the spring fixing pin, fix the elastic retaining ring pressing fixture on the press transition block, the groove of the elastic retaining ring pressing fixture corresponds to the position of the spring fixing pin, loosen the spring fixing pin, and tighten the fixing handle;

[0018] S13. Assemble the servo press under flexible pressure;

[0019] S14. Check the pressing curve: There are no more than 2 inflection points in the force value as the displacement changes, and the force value increases with a large slope after pressing is in place, and the force value is no more than 220N. Save the pressing curve as a historical curve and iteratively optimize the subsequent pressing process and criteria.

[0020] S15. Rotary snap ring pliers: Use snap ring pliers to slightly rotate the spring retainer ring one-quarter turn; it should rotate smoothly without any resistance.

[0021] S16. Retest: Retest the assembly gap according to steps S2 to S5. The gap must be 0.05 to 0.10 mm for the elastic retaining ring to be assembled successfully.

[0022] Step S5 requires four measurements of the adjustment shims after installation. The thickness T must be uniform. Visual inspection shows that the selected adjustment shims are not allowed to have defects such as deformation, abnormal wear, or sharp edges and burrs. After confirmation, the thickness T value is uploaded through a digital dial indicator, and the system automatically calculates the assembly clearance G value.

[0023] The assembly gap in step S6 is 0.05 to 0.10 mm.

[0024] In step S6, the thickness difference of the three adjusting washers is no greater than 0.01 mm.

[0025] In step S11, the surface roughness of the inner surface of the elastic retaining ring guide fixture is controlled to be no greater than Ra0.8, and d is the size of the safety valve mounting hole.

[0026] The elastic retaining ring guide fixture in step S11 controls the compression amount of the elastic retaining ring assembly process to 0.99d to prevent the elastic retaining ring from being over-compressed radially.

[0027] The assembly process for step S13 is as follows:

[0028] a. Within the no-load displacement range of 0 to 230 mm, the servo press presses down at a speed of 30 mm / s;

[0029] b. Within the range of 230 to 250.82 mm, the servo press presses down at a speed of 1.0 mm / s.

[0030] In step S11, the feedback force value during the pressing process is set to be no greater than 220N. This ensures that the elastic retaining ring is pressed into place while maintaining a smooth pressing process. After pressing is completed, the servo press automatically returns to its original position.

[0031] The beneficial effects of this invention are: by controlling the assembly gap of the elastic retaining ring, controlling the pressing parameters of the servo press, and controlling the compression amount of the elastic retaining ring, flexible digital assembly of the elastic retaining ring is achieved, thereby improving the assembly quality and efficiency of the elastic retaining ring and improving the maintenance quality and reliability of the hydraulic piston pump. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a three-dimensional structural diagram of the safety gate mechanism of the present invention;

[0034] Figure 2 This is a schematic diagram of the safety valve mounting hole structure of the present invention;

[0035] Figure 3 This is a schematic diagram of the main structure of the press of the present invention;

[0036] Figure 4 This is a top view of the press structure of the present invention;

[0037] Figure 5 This is a side view of the press structure of the present invention;

[0038] Figure 6 This is a schematic diagram of the elastic retaining ring guide tooling structure of the present invention. Figure 1 ;

[0039] Figure 7 This is a schematic diagram of the elastic retaining ring guide tooling structure of the present invention. Figure 2 ;

[0040] Figure 8 This is a three-dimensional structural diagram of the elastic retaining ring pressing tool of the present invention;

[0041] Figure 9 This is a schematic diagram of the main structure of the gap measuring fixture of the present invention;

[0042] Figure 10 This is a schematic diagram of the three-dimensional structure of the gap measuring fixture of the present invention;

[0043] Reference numerals: 1. Elastic retaining ring; 2. Adjusting washer three; 3. Valve seat; 4. Valve; 5. Adjusting washer two; 6. Adjusting washer one; 7. Spring; 8. Support column; 9. Sealing ring; 10. Safety valve mounting hole; 11. Servo press; 12. Press transition block; 13. Press base; 14. Spring retaining pin; 15. Fixed handle; 16. Elbow clamp; 17. Intermediate positioning shaft; 18. Positioning pin; 19. Elastic retaining ring guide fixture; 20. Elastic retaining ring pressing fixture; 21. Measuring rod; 22. Expansion tire; 23. Tightening nut; 24. Digital dial indicator; 25. Fixed platform; 26. Tire; 27. Nut. Detailed Implementation

[0044] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below.

[0045] like Figures 1 to 10 As shown, a flexible digital assembly method for the elastic retaining ring of a hydraulic piston pump safety valve includes the following specific steps:

[0046] S1. Install the elastic retaining ring 1: Place the valve seat 3 into the safety valve mounting hole 10, and use snap ring pliers to install the process elastic retaining ring 1 into the snap ring groove of the safety valve mounting hole 10;

[0047] S2. Install expansion tire 22: Insert the expansion tire 22 in the gap measuring fixture into the hole of the valve seat 3, and tighten the tightening nut 23 to fix the expansion tire 22 in the hole of the valve seat 3.

[0048] S3. Install the fixed platform 25: Install the gap measuring fixture onto the upper end face of the housing and tighten the nut 27 to fix the fixed platform 25 on the housing. During the installation process, put the measuring rod 21 into the U-shaped opening of the rocker arm 26 and make the end face of the measuring rod 21 contact the digital micrometer 24.

[0049] S4. Zeroing the digital micrometer 24: Raise the rocker arm 26 to bring the measuring rod 21 to the lowest point, return the digital micrometer 24 to zero, and press down the rocker arm 26 to bring the measuring rod 21 to the highest point. This will obtain the travel distance D of the valve seat 3 in the safety valve mounting hole 10. After confirmation, the travel distance value will be uploaded through the digital micrometer 24.

[0050] S5. Calculate the thickness using the formula T = D - 0.1 +0.05 Use a digital micrometer to select and adjust the thickness T of the 2mm shim to ensure that the assembly clearance G meets the requirement of 0.05~0.10mm;

[0051] S6. Remove components: Remove the clearance measuring fixture, and remove the process elastic retaining ring 1 and the valve seat 3;

[0052] Serial Number Repair technical specifications description Repair technical specifications requirements 1 Assembly clearance (0.05~0.10)mm 2 Adjusting the thickness difference of the three washers No larger than 0.01mm

[0053] S7. Inspection: Use a scribing needle to install the sealing ring 9 into the sealing ring groove of the valve seat 3. Slide the sealing ring around the circumference with the scribing needle to check that the sealing ring assembly is not twisted.

[0054] S8. Assembly: Assemble the support column 8, spring 7, selected adjustment washer 1 6 and adjustment washer 2 5, valve 4, valve seat 3, and selected adjustment washer 3 2 in sequence, and place them into the safety valve mounting hole 10 with the support column 8 inside and the adjustment washer 3 2 outside.

[0055] S9. Housing positioning: Place the hydraulic plunger pump housing on the press base 13 to position the housing. The bottom of the housing is fixed to the intermediate positioning shaft 17 and positioning pin 18 on the press base 13. Fasten the elbow clamp 16 to prevent the housing from shaking.

[0056] S10, Groove positioning: Place the elastic retaining ring guide fixture 19 on the safety valve mounting hole 10. The boss on the elastic retaining ring guide fixture 19 should correspond to the groove of the hydraulic piston pump housing to prevent the elastic retaining ring guide fixture 19 from moving in a cross-flow manner.

[0057] S11. Horizontally place the elastic retaining ring 1: Place the elastic retaining ring 1 horizontally in the elastic retaining ring guide fixture 19;

[0058] S12, Corresponding groove: Loosen the fixing handle 15, pull up the spring fixing pin 14, fix the elastic retaining ring pressing tool 20 on the press transition block 12, the groove of the elastic retaining ring pressing tool 20 corresponds to the position of the spring fixing pin 14, loosen the spring fixing pin 14, and tighten the fixing handle 15.

[0059] S13. Assemble the servo press 11 under flexible pressure;

[0060] S14. Check the pressing curve: There are no more than 2 inflection points in the force value as the displacement changes, and the force value increases with a large slope after pressing is in place, and the force value is no more than 220N. Save the pressing curve as a historical curve and iteratively optimize the subsequent pressing process and criteria.

[0061] S15. Rotary snap ring pliers: Use snap ring pliers to slightly rotate the elastic retaining ring by 1 / 4 turn; it should rotate smoothly without any resistance.

[0062] S16. Retest: Retest the assembly gap according to steps S2 to S5. The gap must be 0.05 to 0.10 mm for the elastic retaining ring 1 to be assembled successfully.

[0063] By controlling the assembly gap of the elastic retaining ring 1, controlling the pressing parameters of the servo press 11, and controlling the compression amount of the elastic retaining ring 1, flexible digital assembly of the elastic retaining ring 1 is achieved, thereby improving the assembly quality and efficiency of the elastic retaining ring 1 and improving the maintenance quality and reliability of the hydraulic piston pump.

[0064] Step S5 requires four measurements of the adjustment washer 2 after installation. The thickness T must be uniform. Visual inspection shows that the selected adjustment washer is not allowed to have defects such as deformation, abnormal wear, or sharp edges and burrs. After confirmation, the thickness T value is uploaded through the digital micrometer 24, and the system automatically calculates the assembly gap G value.

[0065] The assembly gap in step S6 is 0.05 to 0.10 mm.

[0066] The thickness difference between the three adjusting washers in step S6 is no greater than 0.01 mm.

[0067] In step S11, the surface roughness of the inner surface of the elastic retaining ring guide fixture 19 is controlled to be no greater than Ra0.8, and d is the size of the safety valve mounting hole 10.

[0068] In step S11, the elastic retaining ring guide fixture 19 controls the compression amount of the elastic retaining ring 1 during assembly to be 0.99d, thereby preventing the elastic retaining ring 1 from being over-compressed radially.

[0069] The main technical specifications for the assembly of the elastic retaining ring 1 are as follows:

[0070]

[0071] The assembly process for step S13 is as follows:

[0072] a. Within the no-load displacement range of 0 to 230 mm, the servo press presses down at a speed of 30 mm / s;

[0073] b. Within the range of 230 to 250.82 mm, the servo press presses down at a speed of 1.0 mm / s.

[0074] In step S11, the feedback force value during the pressing process is set to be no greater than 220N. This ensures that the elastic retaining ring 1 is pressed into place while maintaining a smooth pressing process. After pressing is completed, the servo press 11 automatically returns to its original position.

[0075] This invention enables flexible and digital assembly of the elastic retaining ring 1 at the safety valve of a hydraulic piston pump. It solves the problems of low assembly efficiency and excessive reliance on operational skills in the traditional hydraulic piston pump repair process. It can effectively avoid ring breakage and abnormal wear of the hydraulic piston pump due to assembly issues, thereby improving product maintenance quality and safety.

[0076] This invention has been applied to the quality improvement project of hydraulic piston pump repair, which can effectively improve the assembly quality and efficiency of elastic retaining ring 1. The method is simple, fast, highly repeatable, and has a wide range of application prospects, with significant military, economic and social benefits.

[0077] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve, characterized in that: The specific steps are as follows: S1. Install the elastic retaining ring (1): Place the valve seat (3) into the safety valve mounting hole (10), and use snap ring pliers to install the process elastic retaining ring (1) into the snap ring groove of the safety valve mounting hole (10); S2. Install the expansion tire (22): Insert the expansion tire (22) in the gap measuring fixture into the hole of the valve seat (3), and tighten the tightening nut (23) to fix the expansion tire (22) in the hole of the valve seat (3); S3. Install the fixed platform (25): Install the gap measuring fixture onto the upper end face of the housing and tighten the nut (27) to fix the fixed platform (25) on the housing. During the installation process, put the measuring rod (21) into the U-shaped opening of the rocker arm (26) and the end face of the measuring rod (21) contacts the digital micrometer (24). S4. Zeroing the digital micrometer (24): Raise the lever (26) to bring the measuring rod (21) to the lowest point, return the digital micrometer (24) to zero, and press down the lever (26) to bring the measuring rod (21) to the highest point. This will give you the travel distance D of the valve seat (3) in the safety valve mounting hole (10). After confirmation, upload the travel distance value through the digital micrometer (24). S5. Calculate the thickness using the formula T = (D - 0.1) +0.05 Use a digital micrometer to select and adjust the thickness T of the washers to ensure that the assembly clearance G meets the requirement of 0.05~0.10mm; S6. Remove the components: Remove the clearance measuring fixture, and remove the process elastic retaining ring (1) and the valve seat (3); S7. Inspection: Use a scribing needle to install the sealing ring (9) into the sealing ring groove of the valve seat (3), and slide the sealing ring around the circumference with the scribing needle to check that the sealing ring assembly is not twisted. S8. Assembly: Assemble the support column (8), spring (7), selected adjustment washer one (6) and adjustment washer two (5), valve (4), valve seat (3) and selected adjustment washer three in sequence, and put them into the safety valve mounting hole (10) in the order of support column (8) inside and adjustment washer three outside. S9. Housing positioning: Place the hydraulic plunger pump housing on the press base (13) to position the housing. The bottom of the housing is fixed on the intermediate positioning shaft (17) and positioning pin (18) on the press base (13), and the elbow clamp (16) is fastened. S10, Groove positioning: Place the elastic retaining ring guide fixture (19) on the safety valve mounting hole (10), and the boss on the elastic retaining ring guide fixture (19) should correspond to the groove of the hydraulic piston pump housing; S11, Horizontally place the elastic retaining ring (1): Place the elastic retaining ring (1) horizontally in the elastic retaining ring guide fixture (19); S12, Corresponding groove: Loosen the fixing handle (15), pull up the spring fixing pin (14), fix the elastic retaining ring pressing tool (20) on the press transition block (12), the groove of the elastic retaining ring pressing tool (20) corresponds to the position of the spring fixing pin (14), loosen the spring fixing pin (14), and tighten the fixing handle (15). S13. Assemble the servo press (11) under flexible pressure; S14. Check the pressing curve: There are no more than 2 inflection points in the force value as the displacement changes, and the force value increases with a large slope after pressing is in place, and the force value is no more than 220N. S15, Rotating snap ring pliers: Use snap ring pliers to slightly rotate the elastic retaining ring (1) by one-quarter turn; S16. Retest: Retest the assembly gap according to steps S2 to S5. The gap should be 0.05 to 0.10 mm.

2. The flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve according to claim 1, characterized in that: Step S5 requires four measurements of the adjustment shims after installation. The thickness T must be uniform. Visual inspection shows that the selected adjustment shims are not allowed to have defects such as deformation, abnormal wear, or sharp edges and burrs. After confirmation, the thickness T value is uploaded through a digital dial indicator (24), and the system automatically calculates the assembly gap G value.

3. The flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve according to claim 1, characterized in that: The assembly gap in step S6 is 0.05 to 0.10 mm.

4. The flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve according to claim 1, characterized in that: In step S6, the thickness difference of the three adjusting washers is no greater than 0.01 mm.

5. The flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve according to claim 1, characterized in that: The surface roughness of the inner surface of the elastic retaining ring guide fixture (19) in step S11 is controlled to be no greater than Ra0.8, and d is the size of the safety valve mounting hole (10).

6. The flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve according to claim 1, characterized in that: The elastic retaining ring guide fixture (19) in step S11 controls the compression amount of the elastic retaining ring (1) during assembly to be 0.99d, thereby preventing the elastic retaining ring (1) from being over-compressed radially.

7. The flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve according to claim 1, characterized in that: In step S11, the feedback force value during the pressing process is set to be no greater than 220N.

8. The flexible digital assembly method for the elastic retaining ring of a hydraulic plunger pump safety valve according to claim 1, characterized in that: The assembly process for step S13 is as follows: a. Within the no-load displacement range of 0 to 230 mm, the servo press presses down at a speed of 30 mm / s; b. Within the range of 230 to 250.82 mm, the servo press presses down at a speed of 1.0 mm / s.

Images