Universal plunger assembly axial clearance measuring device
By designing a plunger assembly axial clearance measuring device that includes a base, a centering mechanism, and a measuring mechanism, the problems of low measurement accuracy, cumbersome operation, and high cost in the prior art are solved, and high-precision, low-cost axial clearance measurement of plunger assemblies is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU SPD AUTOMATION EQUIP CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-12
AI Technical Summary
Existing plunger assemblies suffer from low axial clearance measurement accuracy, limited equipment versatility, cumbersome operation, and high cost.
A universal plunger assembly axial clearance measuring device was designed, comprising a base, a centering mechanism, a support mechanism, and a measuring mechanism. Through the cooperation of components such as the centering block, connecting rod assembly, and dial indicator, the plunger assembly can be accurately positioned and measured.
It improves measurement accuracy and repeatability, reduces operational complexity and cost, is suitable for plunger assemblies of different diameters and lengths, and does not damage the slipper.
Smart Images
Figure CN224353757U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of plunger slipper testing equipment, and in particular to a universal plunger assembly axial clearance measuring device. Background Technology
[0002] A plunger assembly is a ball-and-shoe joint consisting of a plunger rod with a ball head and a slipper with a ball socket, connected by a machined hinge. During operation, the plunger assembly is forced to rotate by the return plate. The plunger reciprocates within the cylinder to achieve oil suction and pressure. The continuous disengagement and compression of the plunger and slipper creates a periodic motion that leads to discontinuous fluid delivery and pressure variations. As a key component in the flow and pressure output of a plunger hydraulic pump, the plunger assembly is crucial to the pump's pressure pulsation characteristics and durability.
[0003] After the plunger assembly is machined, the axial clearance between the plunger ball head and the slipper ball socket needs to be measured. Excessive axial clearance between the plunger and slipper can lead to pump flow loss, reduced pump life, increased noise, and decreased efficiency. The primary method for measuring the axial clearance of the plunger assembly is by touch, which is highly subjective. Due to the small clearance, the measurement accuracy is low, and misdiagnosis is common. Using common testing tools such as vernier calipers and height gauges is also cumbersome and lacks precision. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a universal plunger assembly axial clearance measuring device, which can effectively solve the technical problems of low axial clearance measurement accuracy, poor equipment versatility, cumbersome operation and high cost of existing plunger assembly devices.
[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:
[0006] One technical solution of this utility model provides a universal plunger assembly axial clearance measuring device, including a base and a centering mechanism, a support mechanism and a measuring mechanism disposed on the base;
[0007] The centering mechanism includes a fixed base, with two centering blocks and a contact block on one side and an adjustment knob on the other side. The centering blocks are located on both sides of the contact block. A connecting rod assembly is horizontally inserted inside the fixed base, and the two ends of the connecting rod assembly are respectively connected to the contact block and the adjustment knob.
[0008] The support mechanism includes a V-block and a V-block adjusting seat. The V-block and the V-block adjusting seat are detachably fixedly connected. The bottom of both ends of the V-block adjusting seat are respectively fixedly connected to a first slider. Two parallel adjusting grooves are opened on the base, and the first slider is movably embedded in the adjusting groove.
[0009] The measuring mechanism includes a dial indicator, a dial indicator base, and a contact plate. The measuring probe of the dial indicator extends horizontally through the inside of the dial indicator base and abuts against the contact plate. The measuring probe, the contact block, and the plunger assembly are coaxial. A second slider is fixedly connected to the bottom of both ends of the dial indicator base, and the second slider is movably embedded in the adjustment groove.
[0010] During measurement, the plunger assembly is placed in the V-block. The position of the V-block adjusting seat relative to the adjusting groove is adjusted using the first slider. The fixed position between the V-block and the V-block adjusting seat is adjusted so that the plunger assembly and the contact block are coaxially centered. The position of the contact block is adjusted by the adjusting knob so that it abuts against the plunger assembly. The slipper part in the plunger assembly is fixed from both sides by two centering blocks. Then, the dial indicator seat is adjusted by the second slider to slide along the adjusting groove so that the contact plate abuts against the plunger assembly. After the measuring probe abuts against the contact plate, the dial indicator measurement value can be read. The plunger is manually pushed in the axial direction to measure when the assembly clearance between the plunger and the slipper is at the minimum and maximum values. The difference between the dial indicator measurement values at the two positions is taken to obtain the axial clearance value of the plunger assembly.
[0011] In some possible implementations, the centering block has a through first slot in the middle. The first slot is fixedly connected to the fixed seat by a through-bolt, which is used to adjust the connection position between the centering block and the fixed seat in the horizontal direction. This adjusts the distance between the two centering blocks and the plunger assembly, so that the plunger assembly and the contact block are centered and abut against each other. The two centering blocks lock the slipper in the plunger assembly from both sides. Moreover, the clamping width can be adaptively adjusted according to slippers of different diameters, increasing the versatility of the device.
[0012] In some possible implementations, the mounting base is provided with a horizontal scale, which is parallel to the centering blocks. The zero line of the scale is collinear with the axis of the contact block, which is used to indicate the moving distance of the two centering blocks. The two centering blocks fix the position of the plunger assembly in the center position coaxial with the contact block.
[0013] In some possible implementations, the linkage assembly includes a connected helical rod and a sliding rod. The helical rod is fixedly connected to an adjusting knob, and the contact block is fixedly connected to the sliding rod. The sliding rod is slidably fitted inside a fixed seat. The adjusting knob, helical rod, sliding rod, and contact block are coaxial. The helical rod has an external threaded connection to a threaded seat, which is fixedly connected to the fixed seat. By rotating the adjusting knob, the threaded connection position between the helical rod and the threaded seat is adjusted, thereby pushing the sliding rod and the contact block to move horizontally. This adjusts the horizontal position of the contact block so that it abuts against the plunger assembly, ensuring that the two centering blocks engage the slipper while the contact block presses against the slipper to fix its position.
[0014] In some possible implementations, the end of the helical rod is embedded in the sliding rod, and the two are rotatably connected. A guide groove is provided in the middle of the fixed seat, and a limiting rod is provided within the guide groove. The limiting rod is fixedly connected to the sliding rod. When the position of the helical rod within the threaded seat is adjusted by adjusting the knob, the helical rod horizontally pushes the sliding rod to slide within the fixed seat, simultaneously driving the limiting rod to move within the guide groove for guidance.
[0015] In some possible implementations, a V-shaped groove is provided above the V-block, a second through-groove is provided in the middle of the V-block, a slot is provided on the V-block adjusting seat, and a limiting bolt is connected between the slot and the second through-groove to adjust the connection position of the V-block with the V-block adjusting seat in the vertical direction, thereby adjusting the placement height of the plunger assembly so that the plunger assembly and the contact block are coaxially distributed.
[0016] In some possible implementations, two guide rods are horizontally connected to both ends of the dial indicator base. The guide rods are located on both sides of the dial indicator, with one end of the guide rod fixedly connected to the contact plate and the other end movably connected to the dial indicator base.
[0017] During measurement, first, simultaneously bring the measuring probe, the contact plate, and the end of the plunger into contact, ensuring that the contact plate pushes the gap between the plunger and the slipper to its minimum, and record the dial indicator reading. Then, manually push the plunger horizontally while keeping it in contact with the contact plate and the measuring probe, so that the gap between it and the slipper is at its maximum position, record the dial indicator reading, and calculate the difference between the two readings. This change in value is the axial clearance distance of the assembled plunger assembly.
[0018] In some possible implementations, a handle is fixedly connected to each side of the base to facilitate lifting and transporting the entire measuring device.
[0019] This utility model has the following beneficial effects:
[0020] The universal plunger assembly axial clearance measuring device provided by this utility model has a compact structure, small footprint, low manufacturing cost, and convenient operation. It is convenient for inspectors to measure the axial clearance of plunger assemblies with diameters ranging from 3 to 40 mm and lengths from 10 to 160 mm. It has strong versatility, can flexibly adjust the measurement space, has high measurement accuracy and repeatability, and will not damage the slip shoe during the clamping measurement process, thus ensuring good safety performance during the measurement process. Attached Figure Description
[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0022] Figure 1 This is a three-dimensional structural schematic diagram of the universal plunger assembly axial clearance measuring device in this utility model;
[0023] Figure 2 This is a top view of the universal plunger assembly axial clearance measuring device of this utility model;
[0024] Figure 3 This is a right view of the universal plunger assembly axial clearance measuring device of this utility model;
[0025] Figure 4 This is a partial cross-sectional schematic diagram of the axial clearance measuring device for the universal plunger assembly in this utility model;
[0026] Figure 5 This is a three-dimensional structural schematic diagram of the axial clearance measuring device for the assembled plunger assembly of this utility model;
[0027] Figure 6 This is a schematic diagram of the measurement status of the universal plunger assembly axial clearance measuring device in this utility model.
[0028] Explanation of the labels in the diagram:
[0029] 1. Base; 11. Adjustment groove; 12. Handle; 2. Centering mechanism; 21. Fixed seat; 22. Centering block; 221. First strip groove; 23. Contact block; 24. Adjustment knob; 25. Linkage assembly; 251. Helical rod; 252. Sliding rod; 253. Limiting rod; 26. Scale; 27. Threaded seat; 28. Guide groove; 3. Support mechanism; 31. V-block; 311. V-groove; 312. Second strip groove; 32. V-block adjustment seat; 321. Slot hole; 33. First slider; 4. Measuring mechanism; 41. Dial indicator; 42. Dial indicator seat; 43. Contact plate; 44. Second slider; 45. Measuring probe; 46. Guide rod; 5. Limiting bolt; 100. Slipper; 200. Plunger. Detailed Implementation
[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be introduced in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment.
[0031] In the description of this embodiment, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to has a specific orientation, or is constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.
[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.
[0034] refer to Figure 1 This embodiment provides a universal plunger assembly axial clearance measuring device, including a base 1 and a centering mechanism 2, a support mechanism 3 and a measuring mechanism 4 disposed on the base 1.
[0035] Specifically, refer to Figure 1 and Figure 2 The centering mechanism 2 includes a fixed base 21. Two centering blocks 22 and a contact block 23 are located on one side of the fixed base 21, and an adjustment knob 24 is located on the other side. The centering blocks 22 are located on both sides of the contact block 23. The parts of the contact block 23 and the centering blocks 22 that contact the sliding shoe are made of nylon to prevent wear on the sliding shoe. A connecting rod assembly 25 is horizontally inserted inside the fixed base 21. The two ends of the connecting rod assembly 25 are connected to the contact block 23 and the adjustment knob 24, respectively. (Reference) Figure 1 and Figure 5A through-hole first strip-shaped groove 221 is provided in the middle of the centering block 22. The first strip-shaped groove 221 is fixedly connected to the fixed seat 21 by a through-hole limiting bolt 5. This is used to adjust the connection position between the centering block 22 and the fixed seat 21 in the horizontal direction, thereby adjusting the distance between the two centering blocks 22 and the plunger assembly. This ensures that the plunger assembly and the contact block 23 are centered and abut against each other, and that the two centering blocks 22 respectively engage and lock the slipper 100 in the plunger assembly from both sides. (Reference) Figure 1 A horizontal scale 26 is provided on the fixed base 21. The scale 26 is parallel to the centering block 22, and the zero line of the scale 26 is collinear with the axis of the contact block 23. This scale is used to indicate the moving distance of the two centering blocks 22. The two centering blocks 22 fix the position of the plunger assembly in the center position coaxial with the contact block 23. A handle 12 is fixedly connected to each side of the base 1 to facilitate the operator to lift the measuring device during installation and transportation.
[0036] refer to Figure 4 and Figure 5 The connecting rod assembly 25 includes a connected helical rod 251 and a sliding rod 252. The helical rod 251 is fixedly connected to the adjusting knob 24, and the contact block 23 is fixedly connected to the sliding rod 252. The sliding rod 252 is slidably sleeved inside the fixed seat 21. The adjusting knob 24, the helical rod 251, the sliding rod 252, and the contact block 23 are coaxial. The external thread of the helical rod 251 is connected to a threaded seat 27, which is fixedly connected to the fixed seat 21. By rotating the adjusting knob 24, the threaded connection position between the helical rod 251 and the threaded seat 27 is adjusted, thereby pushing the sliding rod 252 and the contact block 23 to move horizontally. This adjusts the horizontal position of the contact block 23 so that it abuts against the plunger assembly, ensuring that the two centering blocks 22 engage the slipper 100 while the contact block 23 abuts against the slipper 100, fixing the position of the slipper 100. The end of the helical rod 251 is embedded in the sliding rod 252, and the two are rotatably connected. A guide groove 28 is provided in the middle of the fixed base 21, and a limiting rod 253 is provided in the guide groove 28. The limiting rod 253 is fixedly connected to the sliding rod 252. When the position of the screw rod 251 in the threaded seat 27 is adjusted by adjusting the knob 24, the screw rod 251 horizontally pushes the sliding rod 252 to slide in the fixed base 21, and at the same time drives the limiting rod 253 to move in the guide groove 28 for guidance.
[0037] refer to Figure 1 The support mechanism 3 includes a V-block 31 and a V-block adjusting seat 32. The V-block 31 and the V-block adjusting seat 32 are detachably fixedly connected. The bottom of both ends of the V-block adjusting seat 32 are respectively fixedly connected to a first slider 33. The base 1 has two parallel adjusting grooves 11, and the first slider 33 is movably embedded in the adjusting grooves 11.
[0038] refer to Figure 1 and Figure 5 A V-shaped groove 311 is provided above the V-shaped block 31, and a through second strip groove 312 is provided in the middle of the V-shaped block 31. A slot 321 is provided on the V-shaped block adjusting seat 32, and a limiting bolt 5 is connected between the slot 321 and the second strip groove 312 to adjust the connection position of the V-shaped block 31 and the V-shaped block adjusting seat 32 in the vertical direction, thereby adjusting the placement height of the plunger assembly so that the plunger assembly and the contact block 23 are coaxially distributed.
[0039] refer to Figures 1 to 3 , Figure 6 The measuring mechanism 4 includes a dial indicator 41, a dial indicator base 42, and a contact plate 43. The measuring probe 45 of the dial indicator 41 extends horizontally through the interior of the dial indicator base 42 and abuts against the contact plate 43. The measuring probe 45, the contact block 23, and the plunger assembly are coaxial. Second sliders 44 are fixedly connected to the bottom of both ends of the dial indicator base 42, and the second sliders 44 are movably embedded in the adjustment groove 11. (Reference) Figure 1 and Figure 6 Two guide rods 46 are horizontally connected to both ends of the dial indicator base 42. The guide rods 46 are located on both sides of the dial indicator 41. One end of the guide rod 46 is fixedly connected to the contact plate 43, and the other end is movably connected to the dial indicator base 42.
[0040] The universal plunger assembly axial clearance measuring device of this utility model measures as follows:
[0041] (1) First, place the plunger assembly in the V-block 31. Adjust the position of the V-block adjusting seat 32 relative to the adjusting groove 11 in the horizontal direction through the first slider 33. Adjust the fixed position between the V-block 31 and the V-block adjusting seat 32 in the vertical direction so that the plunger assembly and the contact block 23 are coaxial and centered.
[0042] (2) Adjust the position of the contact block 23 by adjusting the knob 24 so that it abuts against the plunger assembly, and at the same time, the two centering blocks 22 lock the slipper 100 in the plunger assembly from both sides in the horizontal direction.
[0043] (3) Adjust the dial indicator base 42 to slide horizontally along the adjustment groove 11 by the second slider 44, so that the contact plate 43 abuts against the plunger assembly, and the measuring probe 45 can read the dial indicator measurement value after it abuts against the contact plate 43.
[0044] (4) First, simultaneously bring the measuring probe 45 into contact with the contact plate 43 and the end of the plunger 200 to ensure that the contact plate 43 pushes the gap between the plunger 200 and the slipper 100 to the minimum, and record the reading of the dial indicator 41.
[0045] (5) Manually push the plunger 200 horizontally to keep it in contact with the contact plate 43 and the measuring probe 45, and make the gap between it and the slipper 100 reach the maximum position. Record the reading of the dial indicator 41 and calculate the difference between the two readings. The change in this value is the axial gap distance of the assembled plunger assembly.
[0046] Although the preferred embodiments of this utility model have been disclosed above, they are not intended to limit this utility model. Any person skilled in the art can make possible changes and modifications to the technical solutions of this utility model by utilizing the methods and techniques disclosed above without departing from the spirit and scope of this utility model. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solutions of this utility model shall fall within the protection scope of the technical solutions of this utility model.
Claims
1. A universal plunger assembly axial clearance measuring device, characterized in that, It includes a base (1) and a centering mechanism (2), a support mechanism (3) and a measuring mechanism (4) provided on the base (1); The centering mechanism (2) includes a fixed base (21). Two centering blocks (22) and a contact block (23) are provided on one side of the fixed base (21), and an adjustment knob (24) is provided on the other side. The centering blocks (22) are located on both sides of the contact block (23). A connecting rod assembly (25) is horizontally inserted inside the fixed base (21). The two ends of the connecting rod assembly (25) are connected to the contact block (23) and the adjustment knob (24) respectively. The support mechanism (3) includes a V-block (31) and a V-block adjustment seat (32). The V-block (31) and the V-block adjustment seat (32) are detachably fixedly connected. The bottom of both ends of the V-block adjustment seat (32) are respectively fixedly connected to a first slider (33). Two parallel adjustment grooves (11) are opened on the base (1). The first slider (33) is movably embedded in the adjustment groove (11). The measuring mechanism (4) includes a dial indicator (41), a dial indicator base (42), and a contact plate (43). The measuring probe (45) of the dial indicator (41) extends horizontally through the inside of the dial indicator base (42) and abuts against the contact plate (43). The measuring probe (45), the contact block (23), and the plunger assembly are coaxial. The bottom of both ends of the dial indicator base (42) are respectively fixedly connected to a second slider (44), which is movably embedded in the adjustment groove (11).
2. The universal plunger assembly axial clearance measuring device according to claim 1, characterized in that, The centering block (22) has a through first strip groove (221) in the middle, and the first strip groove (221) is fixedly connected to the fixing seat (21) by a through limit bolt (5).
3. The universal plunger assembly axial clearance measuring device according to claim 2, characterized in that, The fixed base (21) is provided with a horizontal scale (26), which is parallel to the centering block (22). The zero line of the scale (26) is collinear with the axis of the contact block (23).
4. The universal plunger assembly axial clearance measuring device according to claim 1, characterized in that, The connecting rod assembly (25) includes a connected helical rod (251) and a sliding rod (252). The helical rod (251) is fixedly connected to the adjusting knob (24), and the contact block (23) is fixedly connected to the sliding rod (252). The sliding rod (252) is slidably sleeved inside the fixed seat (21). The adjusting knob (24), the helical rod (251), the sliding rod (252) and the contact block (23) are coaxial. The external thread of the helical rod (251) is connected to a threaded seat (27), and the threaded seat (27) is fixedly connected to the fixed seat (21).
5. The universal plunger assembly axial clearance measuring device according to claim 4, characterized in that, The end of the spiral rod (251) is embedded in the sliding rod (252) and the two are rotatably connected. The middle part of the fixed seat (21) is provided with a guide groove (28), and a limiting rod (253) is provided in the guide groove (28). The limiting rod (253) is fixedly connected to the sliding rod (252).
6. The universal plunger assembly axial clearance measuring device according to claim 1, characterized in that, The V-shaped block (31) has a V-shaped groove (311) on its upper part, and a through second strip groove (312) is opened in the middle of the V-shaped block (31). The V-shaped block adjusting seat (32) has a slot (321) and a limiting bolt (5) is connected between the slot (321) and the second strip groove (312).
7. The universal plunger assembly axial clearance measuring device according to claim 1, characterized in that, Two guide rods (46) are horizontally connected to both ends of the dial indicator base (42). The guide rods (46) are located on both sides of the dial indicator (41). One end of the guide rod (46) is fixedly connected to the contact plate (43), and the other end is movably connected to the dial indicator base (42).
8. The universal plunger assembly axial clearance measuring device according to claim 1, characterized in that, A handle (12) is fixedly connected to each side of the base (1).