Axial clearance gauge for connecting rod plunger

Abstract

The application relates to an axial gap detector for a connecting rod plunger, which comprises a bottom plate, a first V-shaped block and a second V-shaped block being fixedly arranged on the top surface of the bottom plate and being spaced apart along the length direction of the connecting rod plunger, the first V-shaped block being used for placing a rod body of the connecting rod plunger, a stopper being fixedly arranged on the end of the first V-shaped block away from the second V-shaped block and being used for abutting against the rod body, the second V-shaped block being used for placing a ball head of the connecting rod plunger, the center of the ball head and the center line of the rod body being located on the same straight line, a clamping assembly being fixedly arranged on the top surface of the bottom plate and being used for clamping and fixing the rod body of the connecting rod plunger, and a measuring assembly, the measuring assembly comprising a micrometer seat and a micrometer, the micrometer seat being fixedly arranged on the top surface of the bottom plate along the length direction of the connecting rod plunger, the micrometer being fixedly installed on the micrometer seat, and the pointer of the micrometer pointing to the vertex of the ball head. Through the application, the axial gap distance of the connecting rod plunger can be quickly identified, the operation is simple, different models can be quickly converted, the cost is low, and the reading is accurate.

Description

Technical Field

[0001] This application relates to the field of hydraulic pump component testing technology, specifically to an axial clearance gauge for a connecting rod plunger. Background Technology

[0002] The connecting rod plunger, installed in a swashplate axial piston pump, is a key component of the pump. When the drive shaft of the swashplate axial piston pump rotates, the connecting rod and plunger contact the cylinder block, causing the cylinder block to rotate. Simultaneously, the plunger reciprocates within the plunger bore of the cylinder block, achieving oil suction and pressure. The centerline of the drive shaft of the swashplate axial piston pump is inclined at an angle to the centerline of the cylinder block. By adjusting the tilt angle of the cylinder block relative to the main shaft, the plunger stroke can be changed, thereby controlling the displacement. Therefore, the swashplate axial piston pump also functions as a variable displacement pump.

[0003] Compared to straight-shaft axial piston pumps, swashplate axial piston pumps have a larger tilt angle between the cylinder block and the spindle, reaching up to 36 degrees, while the tilt angle of straight-shaft axial piston pumps does not exceed 20 degrees. This allows swashplate axial piston pumps to have a longer stroke and a wider variable range, enabling them to discharge more oil. Therefore, swashplate axial piston pumps are core power components in high-pressure hydraulic systems and are widely used in: construction machinery: excavator and crane hydraulic systems (requiring large displacement and high pressure); industrial equipment: injection molding machines and machine tool hydraulic stations (relying on precise variable control); aerospace: aircraft landing gear actuation systems (requiring high reliability).

[0004] In existing technologies, plunger pump manufacturers typically use the following two methods to measure the axial clearance of the connecting rod plunger in a slant-shaft axial plunger pump: 1. Split-type inspection: using plug gauges to measure radial clearance and dial indicators to detect runout, which suffers from inconsistent reference standards (accumulated errors ≥ 0.02 mm); 2. Optical imaging instrument: the equipment is expensive (a single unit > 500,000 RMB), making it difficult for small and medium-sized enterprises to configure; the inspection cycle is long (a single piece ≥ 5 minutes), which is not suitable for the rapid inspection needs of production lines. Summary of the Invention

[0005] This application provides an axial clearance gauge for connecting rod plungers, which can quickly identify the axial clearance distance of connecting rod plungers. It is simple to operate, adaptable to quick conversion of different models, low in cost, and provides accurate readings.

[0006] This application provides an axial clearance gauge for a connecting rod plunger, comprising: a base plate, on the top surface of which a first V-block and a second V-block are fixedly disposed, spaced apart along the length of the connecting rod plunger; the first V-block is used to place the rod body of the connecting rod plunger, and a stop block for abutting the rod body is fixedly disposed at the end away from the second V-block; the second V-block is used to place the ball head of the connecting rod plunger, the center of the ball head being collinear with the center line of the rod body; a clamping assembly fixedly disposed on the top surface of the base plate for clamping and fixing the rod body of the connecting rod plunger; and a measuring assembly comprising a dial indicator base and a dial indicator, the dial indicator base being fixedly disposed on the top surface of the base plate along the length of the connecting rod plunger, the dial indicator being fixedly mounted on the dial indicator base, and the dial indicator needle pointing to the apex of the ball head.

[0007] In some embodiments, the center distance tolerance between the first V-block and the second V-block is ±0.005 mm.

[0008] In some embodiments, the radius tolerance of the second V-block is ±0.02 mm.

[0009] In some embodiments, the clamping assembly includes a clamping seat and a clamp, the clamping seat being fixed to the top surface of the base plate, the clamp being fixedly mounted on the clamping seat, and the clamping end of the clamp being fixedly provided with a pressure block for pressing the rod body.

[0010] In some embodiments, the force axis of the clamp coincides with the symmetry plane of the first V-block by less than 0.03 mm.

[0011] In some embodiments, the side of the pressure block that contacts the rod body is provided with anti-slip texture.

[0012] In some embodiments, the side of the pressure block that contacts the rod is an arc-shaped surface.

[0013] In some embodiments, the pressure block is elastic.

[0014] In some embodiments, the bottom of the base plate is provided with a plurality of rubber feet evenly distributed.

[0015] In some embodiments, a pair of handles are symmetrically provided on the top surface of the base plate.

[0016] The beneficial effects of the technical solutions provided in this application include:

[0017] This application, by providing a first V-block for placing the connecting rod plunger body and a second V-block for placing the connecting rod plunger ball head at intervals along the length of the connecting rod plunger on the top surface of the base plate, allows for stable placement of the connecting rod plunger during axial clearance measurement, ensuring correct placement posture, i.e., the center of the ball head is located on the centerline of the rod body. This facilitates subsequent measurement of the connecting rod plunger's axial clearance. Furthermore, since the tops of the first and second V-blocks are V-shaped surfaces, they can be adapted for quick conversion between different connecting rod plunger models.

[0018] By fixing a stop block at one end away from the second V-block to hold the rod, simple positioning can be achieved when placing the connecting rod plunger. It can also ensure that the connecting rod plunger does not produce huge axial displacement when measuring the connecting rod plunger, thus ensuring the accuracy of the axial clearance measurement of the connecting rod plunger.

[0019] By fixing the clamping assembly to the top surface of the base plate, it can be used to hold and fix the connecting rod plunger, preventing it from shifting during the measurement process and causing measurement inaccuracies.

[0020] When measuring the axial clearance of a connecting rod plunger using a measuring assembly, the dial indicator base is fixed to the top surface of a base along the length of the connecting rod plunger, and the dial indicator is fixedly mounted on the base with its needle pointing to the apex of the ball joint. By adjusting the dial indicator needle until it abuts against the apex of the ball joint, the connecting rod plunger is moved back and forth along its length, and the difference in the maximum value of the dial indicator reading is taken. This allows for the determination of the axial clearance of the connecting rod plunger with relatively high accuracy. Therefore, this application provides a highly accurate, simple, and efficient measurement of the axial clearance of the connecting rod plunger. Furthermore, this axial clearance gauge for the connecting rod plunger can be quickly adapted to different models and has a low manufacturing cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a front view of the axial clearance gauge for the connecting rod plunger in the embodiments of this application;

[0023] Figure 2 This is a top view of the axial clearance gauge for the connecting rod plunger in the embodiments of this application.

[0024] In the picture:

[0025] 1. Base plate; 2. First V-block; 3. Second V-block; 4. Stop block; 5. Connecting rod plunger; 51. Rod body; 52. Ball head; 6. Clamping assembly; 61. Clamp seat; 62. Clamp; 63. Pressure block; 7. Measuring assembly; 71. Dial indicator seat; 72. Dial indicator; 721. Indicator needle; 8. Rubber feet; 9. Handle. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0027] This application provides an axial clearance gauge for connecting rod plungers, which can quickly identify the axial clearance distance of connecting rod plungers. It is simple to operate, adaptable to quick conversion between different models, low in cost, and provides accurate readings.

[0028] Reference Figure 1 and Figure 2 , Figure 1 This is a front view of the axial clearance gauge of the connecting rod plunger 5 in the embodiments of this application; Figure 2 This is a top view of the axial clearance gauge for the connecting rod plunger 5 in this embodiment of the application. Figure 1 and Figure 2As shown, the axial clearance gauge for the connecting rod plunger 5 includes: a base plate 1, a first V-block 2, a second V-block 3, a stop 4, a clamping assembly 6, and a measuring assembly 7. Specifically, the top surface of the base plate 1 is fixed with the first V-block 2 and the second V-block 3, which are spaced apart along the length of the connecting rod plunger 5. The first V-block 2 is used to place the rod body 51 of the connecting rod plunger 5, and the end away from the second V-block 3 is fixed with a stop 4 for supporting the rod body 51. The second V-block 3 is used to place the ball head 52 of the connecting rod plunger 5, and the center of the ball head 52 is on the same straight line as the center line of the rod body 51. Preferably, the base plate 1 can be made of 45# steel with a flatness of 0.02 / 1000mm. The first V-block 2 and the second V-block 3 can both be made of Cr12 (alloy tool steel), and the surface roughness of the first V-block 2 is Ra0.4 (meaning the average surface roughness of the material is 0.4 micrometers). The radius of the second V-block 3 can be R20±0.002mm. The plane of symmetry of the first V-block 2 and the second V-block 3 is the same plane. The connecting rod plunger 5 is placed on the first V-block 2 and the second V-block 3, and the center of its ball head 52 is on the same straight line as the center line of the rod body 51. The first V-block 2 and the second V-block 3 are fixed to the top surface of the base plate 1. They can be designed separately from the base plate 1 to facilitate replacement when the first V-block 2 and the second V-block 3 are worn out. The material of the stop block 4 can be 45# steel. One end of the rod body 51 of the connecting rod plunger 5 is the ball head 52, and the other end abuts against the stop block 4. The abutting surface of the stop block 4 can be set at a 90-degree angle with the axis of the first V-block 2.

[0029] The clamping assembly 6 is fixed to the top surface of the base plate 1 and is used to clamp and fix the connecting rod plunger 5. Preferably, the clamping assembly 6 is fixed to the top surface of the base plate 1 and is mainly used to clamp and fix the connecting rod plunger 5. Its fixing position can be the rod body 51 of the connecting rod plunger 5, fixing the rod body 51 to the first V-block 2.

[0030] The measuring assembly 7 includes a dial indicator base 71 and a dial indicator 72. The dial indicator base 71 is fixed to the top surface of the base plate 1 along the length direction of the connecting rod plunger 5. The dial indicator 72 is fixedly mounted on the dial indicator base 71, and the pointer 721 of the dial indicator 72 points to the apex of the ball head 52. Preferably, the measuring assembly 7 is used to measure the axial clearance of the connecting rod plunger 5. Therefore, the measuring assembly 7 needs to be set along the length direction (axial direction) of the connecting rod plunger 5, and the pointer 721 of the dial indicator 72 points to the apex of the ball head 52. By adjusting the distance between the pointer 721 and the apex of the ball head 52, the pointer 721 is positioned at the apex of the ball head 52.

[0031] In this embodiment, by providing a first V-block 2 for placing the rod body 51 of the connecting rod plunger 5 and a second V-block 3 for placing the ball head 52 of the connecting rod plunger 5 at intervals along the length of the connecting rod plunger 5 on the top surface of the base plate 1, the connecting rod plunger 5 can be placed smoothly during the axial clearance measurement, ensuring that its placement posture is correct, i.e., the center of the ball head 52 is located on the center line of the rod body 51. This facilitates the subsequent measurement of the axial clearance of the connecting rod plunger 5. In addition, since the tops of the first V-block 2 and the second V-block 3 are V-shaped surfaces, they can be adapted for quick conversion between different models of connecting rod plungers 5.

[0032] By fixing a stop 4 for holding the rod body 51 at one end away from the second V-block 3, simple positioning can be achieved when placing the connecting rod plunger 5, and the connecting rod plunger 5 can be ensured that it will not produce huge axial displacement when measuring it, thus ensuring the accuracy of the axial clearance measurement of the connecting rod plunger 5.

[0033] By fixing the clamping assembly 6 to the top surface of the base plate 1, it can be used to hold and fix the connecting rod plunger 5 to prevent it from shifting during the measurement process, which would lead to measurement inaccuracy.

[0034] When measuring the axial clearance of the connecting rod plunger 5 using the measuring assembly 7, the dial indicator base 71 is fixed to the top surface of the base along the length of the connecting rod plunger, and the dial indicator 72 is fixedly mounted on the dial indicator base 71 so that the needle 721 of the dial indicator 72 points to the apex of the ball head 52. By adjusting the needle 721 of the dial indicator 72 until it abuts against the apex of the ball head 52, the rod body 51 of the connecting rod plunger 5 is moved back and forth along its length, and the maximum difference of the dial indicator 72 is read. The axial clearance of the connecting rod plunger 5 can then be determined, and the reading is relatively accurate. Therefore, through this embodiment, the axial clearance measurement of the connecting rod plunger 5 is relatively accurate, simple to operate, and highly efficient. In addition, the axial clearance gauge of the connecting rod plunger 5 can be quickly adapted to different models, and the manufacturing cost is low.

[0035] Furthermore, in one embodiment, the center distance tolerance between the first V-block 2 and the second V-block 3 is ±0.005mm. In this embodiment, for the connecting rod plunger 5, the center distance accuracy directly affects its axial straightness and the coaxiality of the two support points. By controlling the center distance tolerance between the first V-block 2 and the second V-block 3 to ±0.005mm, the measurement results of the axial clearance of the connecting rod plunger 5 can be ensured to be more accurate.

[0036] Furthermore, in one embodiment, the radius tolerance of the second V-block 3 is ±0.02mm. In this embodiment, the second V-block 3 is mainly used to place the ball head 52 of the connecting rod plunger 5, and its radius needs to match the curvature of the ball head 52. By controlling the radius tolerance of the second V-block 3 to ±0.02mm, the matching degree between the radius and the curvature of the ball head 52 can be ensured, avoiding the ball head 52 tilting or poor contact due to excessive radius deviation.

[0037] Furthermore, in one embodiment, such as Figure 1 and Figure 2 As shown, the clamping assembly 6 includes a clamp seat 61 and a clamp 62. The clamp seat 61 is fixed to the top surface of the base plate 1, and the clamp 62 is fixedly mounted on the clamp seat 61. A pressure block 63 for pressing the rod body 51 is fixed to the clamping end of the clamp 62. In this embodiment, the clamping assembly 6 includes a clamp 62 and a clamp seat 61, and the clamp seat 61 can be rigidly fixed to the top surface of the base plate 1 by bolts or welding. The clamp seat 61 is fixed close to the first V-block 2. For example, the clamp seat 61 can be located on one side of the first V-block 2, or at the end of the first V-block 2 away from the second V-block 3. The clamp 62 can be a manual clamp 62 (such as a spiral clamp or a toggle clamp) or a pneumatic clamp 62, providing clamping force through levers or air pressure. Figure 1 As shown, the clamp 62 is fixedly mounted on the clamp base 61 and located directly above the first V-block 2. The center of the clamping end pressure block 63 falls on the symmetry plane of the first V-block 2. The pressure block 63 is usually made of soft metals such as aluminum and copper or non-metallic materials such as nylon and rubber to avoid damaging the surface of the rod 51 (especially precision-machined cylindrical surfaces). The pressure block 63 can be divided into two types: one is a flat pressure block 63, which is suitable for situations where the rod 51 is a flat surface or a large-diameter cylindrical surface, providing uniform pressure; the other is an arc-shaped pressure block 63, which matches the curvature of the cylindrical surface of the rod 51 to form line contact or surface contact, reducing local stress concentration.

[0038] In this embodiment, by fixing the clamp seat 61 to the top surface of the base plate 1, the clamp 62 is fixedly installed on the clamp seat 61. The clamping end of the clamp 62 is fixed with a pressure block 63 for pressing the rod body 51. After the first V-block 2 (with stop block 4) and the second V-block 3 complete the axial and radial positioning of the connecting rod plunger 5, the clamp 62 can also apply a clamping force to the middle of the rod body 51 through the pressure block 63, thereby forming a stable structure of "three-point positioning and single-point clamping". This can effectively prevent the connecting rod plunger 5 from being slightly offset due to gravity, measuring force (such as the pressure of the needle 721 of the dial indicator 72) or vibration, and ensure that the center of the ball head 52 and the center line of the rod body 51 are always collinear.

[0039] Furthermore, in one embodiment, such as Figure 2As shown, the overlap between the force-applying axis of the clamp 62 and the symmetry plane of the first V-block 2 is less than 0.03 mm. In this embodiment, by controlling the overlap between the force-applying axis of the clamp 62 and the symmetry plane of the first V-block 2 to less than 0.03 mm, the force of the pressure block 63 can be transmitted along the axial direction of the rod 51, resulting in a more uniform stress distribution and preventing lateral slippage or tilting of the connecting rod plunger 5 due to eccentric load.

[0040] Furthermore, in one embodiment, the side of the pressure block 63 that contacts the rod 51 is provided with anti-slip texture. In this embodiment, by providing anti-slip texture on the side of the pressure block 63 that contacts the rod 51, for example, with a texture depth of 0.3-0.5mm, the coefficient of friction between the pressure block 63 and the rod 51 can be increased, preventing the connecting rod plunger 5 from slipping in the axial direction.

[0041] Furthermore, in one embodiment, the side of the pressure block 63 that contacts the rod 51 is an arc-shaped surface. In this embodiment, by setting the side of the pressure block 63 that contacts the rod 51 to an arc-shaped surface, the rod 51 can be limited to prevent it from rotating around its axis, effectively suppressing the slight shaking of the connecting rod plunger 5 during the measurement process.

[0042] Furthermore, in one embodiment, the pressure block 63 is elastic. In this embodiment, the pressure block 63 is made of an elastic material, such as rubber and polyurethane. By making it elastic, impact loads can be reduced through cushioning, while pressure is dispersed with flexible contact during continuous clamping, protecting the surface integrity of the rod 51.

[0043] Furthermore, in one embodiment, such as Figure 1 As shown, multiple rubber pads 8 are evenly distributed on the bottom of the base plate 1. In this embodiment, the rubber material itself has a high coefficient of friction, and the evenly distributed rubber pads 8 can increase the contact area between the base plate 1 and the worktable surface. Through the principle of "multi-point support and flexible gripping", the static friction is significantly improved, preventing the axial clearance gauge of the connecting rod plunger 5 from slipping during clamping or handling. It is especially suitable for vibration environments or scenarios that require frequent position adjustments, avoiding accuracy deviations or safety hazards caused by slippage.

[0044] Furthermore, in one embodiment, such as Figure 2 As shown, a pair of handles 9 are symmetrically arranged on the top surface of the base plate 1. In this embodiment, the symmetrically arranged handles 9 ensure that the force points are evenly distributed when two or more people carry the device, so that the center of gravity of the base plate 1 is located on the center line of the line connecting the handles 9, avoiding tilting, flipping or shifting of the center of gravity of the device due to unilateral force application.

[0045] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0046] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An axial clearance gauge for a connecting rod plunger, characterized in that, include: The base plate (1) has a first V-shaped block (2) and a second V-shaped block (3) fixed on its top surface. The two are spaced apart along the length of the connecting rod plunger (5). The first V-shaped block (2) is used to place the rod body (51) of the connecting rod plunger (5). A stop block (4) for supporting the rod body (51) is fixed at one end away from the second V-shaped block (3). The second V-shaped block (3) is used to place the ball head (52) of the connecting rod plunger (5). The center of the ball head (52) is on the same straight line as the center line of the rod body (51). The clamping assembly (6) is fixed to the top surface of the base plate (1) and is used to clamp the rod (51) of the fixed connecting rod plunger (5). The measuring component (7) includes a dial indicator base (71) and a dial indicator (72). The dial indicator base (71) is fixed to the top surface of the base plate (1) along the length direction of the connecting rod plunger (5). The dial indicator (72) is fixedly installed on the dial indicator base (71), and the needle of the dial indicator (72) points to the apex of the ball head (52).

2. The axial clearance gauge for the connecting rod plunger as described in claim 1, characterized in that, The center distance tolerance between the first V-block (2) and the second V-block (3) is ±0.005mm.

3. The axial clearance gauge for the connecting rod plunger as described in claim 1, characterized in that, The tolerance of the surface radius of the second V-block (3) is ±0.02mm.

4. The axial clearance gauge for the connecting rod plunger as described in claim 1, characterized in that, The clamping assembly (6) includes a clamp seat (61) and a clamp (62). The clamp seat (61) is fixed to the top surface of the base plate (1), and the clamp (62) is fixedly installed on the clamp seat (61). The clamping end of the clamp (62) is fixed with a pressure block (63) for pressing the rod body (51).

5. The axial clearance gauge for the connecting rod plunger as described in claim 4, characterized in that, The force-applying axis of the clamp (62) coincides with the symmetry plane of the first V-block (2) by less than 0.03 mm.

6. The axial clearance gauge for the connecting rod plunger as described in claim 4, characterized in that, The side of the pressure block (63) that contacts the rod (51) is provided with anti-slip texture.

7. The axial clearance gauge for the connecting rod plunger as described in claim 4, characterized in that, The side of the pressure block (63) that contacts the rod (51) is an arc-shaped surface.

8. The axial clearance gauge for the connecting rod plunger as described in claim 4, characterized in that, The pressure block (63) is elastic.

9. The axial clearance gauge for the connecting rod plunger as described in claim 1, characterized in that, The bottom of the base plate (1) is provided with a plurality of rubber pads (8) evenly distributed.

10. The axial clearance gauge for the connecting rod plunger as described in claim 1, characterized in that, The bottom plate (1) has a pair of handles (9) symmetrically arranged on its top surface.

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