Adjustable pull-off force testing tooling for various size plunger shoe assembly components

Abstract

The application discloses an adjustable pull-out force test tool suitable for various size plunger slipper assembly components, which comprises an upper clamping structure and a lower clamping structure. The upper clamping structure comprises an upper clamping cap and an upper pull rod which are connected with each other. The bottom of the upper clamping cap is provided with a T-shaped cavity with a V-shaped opening, which is used for accommodating and limiting the slipper of the plunger slipper assembly component to be tested. The lower clamping structure comprises a lower clamping shell, a lower pull rod and a slidable limiting plate. The lower clamping shell is internally provided with a cavity structure, and the bottom of the lower clamping shell is connected with the lower pull rod. The slidable limiting plate is a pair of right-angled trapezoidal plates which are placed on the top of the lower clamping shell. After the plunger of the plunger slipper assembly component to be tested is placed in the cavity structure of the lower clamping shell, the slidable limiting plate is adjusted so that the inclined edges of the pair of right-angled trapezoidal plates clamp the neck of the plunger slipper assembly component and axially limit the plunger slipper assembly component. The application has wide application range, simple structure and convenient operation.

Description

Technical Field

[0001] This invention relates to the field of measuring devices for plunger pump assemblies, and particularly to an adjustable pull-out force testing fixture suitable for plunger slipper assembly assemblies of various sizes. Background Technology

[0002] The plunger slipper assembly is the core component of a hydraulic pump / motor. Several sets of plunger slipper assemblies together with the cylinder block form the core rotating part of the hydraulic pump / motor.

[0003] The plunger slipper assembly requires high precision, and pull-out force is a key indicator of this assembly. Therefore, a set of testing fixtures suitable for batch testing and easy to use is necessary. Furthermore, with the continuous design and development of hydraulic pump / motor models, plunger slipper assemblies are becoming increasingly diverse in size and connection methods between the plunger and slipper. Designing and manufacturing multiple sets of testing fixtures of different specifications is costly and difficult to manage, making it impractical for improving production efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes an adjustable pull-out force testing fixture suitable for plunger slipper assembly components of various sizes. This fixture is designed to handle pull-out force testing of plunger slipper assembly components of different specifications and sizes in actual production testing activities, thereby saving on fixture manufacturing and management costs.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An adjustable pull-out force testing fixture suitable for plunger slipper assembly components of various sizes, comprising an upper clamping structure and a lower clamping structure;

[0007] The upper clamping structure includes an upper clamping cap and an upper pull rod connected to each other; the bottom of the upper clamping cap has a T-shaped cavity with a V-shaped opening for accommodating the slipper of the plunger slipper assembly to be tested. The cross-section of the T-shaped cavity gradually decreases from the inlet. When the slipper enters the T-shaped cavity with the V-shaped opening, it is horizontally limited by the V-shaped opening and axially limited by the inward protrusion at the bottom of the T-shaped cavity, so that the slipper is clamped in the upper clamping cap.

[0008] The lower clamping structure includes a lower clamping housing, a pull rod, and a sliding limiting plate. The lower clamping housing has an internal cavity, and its bottom is connected to the pull rod. The sliding limiting plate is a pair of right-angled trapezoidal plates placed on top of the lower clamping housing. After the plunger of the plunger shoe assembly to be tested is placed in the cavity of the lower clamping housing, the sliding limiting plate is adjusted so that the hypotenuses of the pair of right-angled trapezoidal plates clamp the plunger neck or the edge of the plunger opening of the plunger shoe assembly, axially limiting it. Then, the sliding limiting plate is fixed to the lower clamping housing by fasteners.

[0009] Furthermore, the sliding limiting plate has strip grooves at both ends. Through the strip grooves, when the sliding limiting plate is adapted to different plunger slipper assembly components to be tested, its installation position on the lower clamping housing can be changed.

[0010] Furthermore, a T-shaped through slot is provided at the top of the upper clamping structure, and the movable upper pull rod is installed in the T-shaped through slot.

[0011] Furthermore, the lower clamping structure also includes a pressure plate, which is located on the slidable limiting plate. Both the pressure plate and the slidable limiting plate are fixed to the lower clamping housing by fasteners.

[0012] Furthermore, the lower clamping housing and the pull rod are an integrated structure.

[0013] The beneficial effects of this invention are as follows:

[0014] (1) The adjustable pull-out force testing fixture of the present invention can be adapted to plunger slipper assembly components of different sizes by simply adjusting the position of the limiting plate and the V-groove on the upper clamping cap, making the fixture of the present invention widely applicable.

[0015] (2) The test fixture of the present invention has a simple structure, small size and convenient operation. Attached Figure Description

[0016] Figure 1 A circumferential view of an adjustable pull-out force testing fixture for various sizes of plunger slipper assembly components provided in this embodiment of the invention;

[0017] Figure 2 A front view of an adjustable pull-out force testing fixture for various sizes of plunger slipper assembly components provided in an embodiment of the present invention;

[0018] Figure 3 Left view of an adjustable pull-out force testing fixture for plunger slipper assembly of various sizes provided in an embodiment of the present invention;

[0019] Figure 4 A top view of an adjustable pull-out force testing fixture for plunger slipper assembly assemblies of various sizes provided in an embodiment of the present invention;

[0020] Figure 5 A cross-sectional view of an adjustable pull-out force testing fixture for plunger slipper assembly of various sizes provided in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the upper clamping cap of an adjustable pull-out force testing fixture suitable for various sizes of plunger slipper assembly components provided in an embodiment of the present invention; wherein, Figure 8 (a) in the figure is a circumferential side view of the upper clamp cap. Figure 8 (b) is a bottom view of the top-mounted cap.

[0022] Figure 7 A peripheral view of the lower clamping housing of an adjustable pull-out force testing fixture for various sizes of plunger slipper assembly provided in this application embodiment;

[0023] Figure 8 A circumferential view of the sliding limiting plate of the adjustable pull-out force testing fixture applicable to various sizes of plunger slipper assembly components provided in this embodiment of the invention;

[0024] Figure 9 A side view of the pressure plate of an adjustable pull-out force testing fixture for various sizes of plunger slipper assembly components provided in an embodiment of the present invention.

[0025] In the figure: 1. Upper clamping structure; 11. Movable upper pull rod; 12. Upper clamping cap; 2. Lower clamping structure; 21. Screw; 22. Pressure plate; 23. Sliding limiting plate; 24. Lower clamping housing; 3. Plunger slipper assembly; 31. Slipper; 32. Plunger. Detailed Implementation

[0026] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0027] like Figures 1-5 As shown, this embodiment of the adjustable pull-out force testing fixture, applicable to plunger slipper assembly assemblies of various sizes, includes two parts: an upper clamping structure 1 and a lower clamping structure 2. Wherein,

[0028] The upper clamping structure 1 includes an upper clamping cap 12 and a movable upper pull rod 11. The top of the upper clamping cap 12 has a T-shaped through slot, such as... Figure 6As shown in (a), the width of the T-shaped through groove is uniform, and the movable upper pull rod 11 is placed in the T-shaped through groove and can slide within it. Figure 6 As shown, the bottom of the upper clamping cap 12 has a T-shaped cavity with a V-shaped opening, and the cross-section of the T-shaped cavity gradually decreases from the inlet. Figure 5 As shown, the T-shaped cavity with a V-shaped opening is used to accommodate the slipper 31 of the plunger slipper assembly 3. When the slipper enters the T-shaped cavity with a V-shaped opening, it is horizontally limited by the V-shaped opening and axially limited by the protrusion at the bottom of the T-shaped cavity, so that the slipper 31 is clamped in the upper clamping cap 12.

[0029] The lower clamping structure 2 includes a lower clamping housing 24, a sliding limiting plate 23, a pressure plate 22, and screws 21. For example... Figure 7 As shown, the lower clamping housing 24 has an internal cavity structure, and its bottom protrudes to form a pull rod. A sliding limiting plate 23 is placed on top of the lower clamping housing 24; it is a pair of right-angled trapezoidal plates, as shown... Figure 8 As shown, this is used to axially limit the plunger 32 of the plunger slipper assembly 3. When the plunger 32 of the plunger slipper assembly 3 to be tested is placed in the cavity of the lower clamping housing 24, the sliding limiting plate 23 is adjusted so that the hypotenuses of a pair of right-angled trapezoidal plates press against the neck (ball head on the plunger) or the edge of the constricted opening of the plunger 32 of the plunger slipper assembly 3. Then, a pressure plate 22 is placed on the sliding limiting plate 23, as shown. Figure 9 As shown, the pressure plate 22 and the sliding limiting plate 23 are finally fixed to the lower clamping housing 24 by screws 21, preventing the plunger 32 from moving axially. The sliding limiting plate 23 also has slots at both ends, allowing the installation position of the sliding limiting plate 23 to be changed to accommodate plunger shoe assembly assemblies of various sizes. In this embodiment, the pressure plate 22 can also be omitted; the sliding limiting plate 23 can be directly fixed to the lower clamping housing 24 by capped screws 21 (with appropriately sized washers).

[0030] The working process of the adjustable pull-out force testing fixture applicable to various sizes of plunger slipper assembly assemblies in this embodiment is as follows:

[0031] Connect the pull rod of the lower clamping housing 24 to the tensile testing machine. Place the plunger of the plunger slipper assembly 3 to be tested into the cavity of the lower clamping housing 24. At this time, adjust the sliding limiting plate 23 so that the hypotenuses of a pair of right-angled trapezoidal plates press against the neck (ball head on the plunger) or the edge of the constricted end of the plunger 32 of the plunger slipper assembly 3. Then place the pressure plate 22 on the sliding limiting plate 23. Finally, fix the pressure plate 22 and the sliding limiting plate 23 to the lower clamping housing 24 with screws 21 to prevent the plunger from moving axially. Then, pass the slipper 31 of the plunger slipper assembly 3 to be tested through the T-shaped cavity with a V-shaped opening at the bottom of the upper clamping cap 12, and adjust its clamping position in the T-shaped cavity according to the size of the slipper. Finally, connect the movable upper pull rod 11 of the upper clamping structure 1 to the tensile testing machine. By applying two forces in opposite directions from top to bottom using a tensile testing machine, the connection between the ball head and the ball socket of the plunger slipper assembly 3 to be tested is discontinued, and the pull-out force can be obtained.

[0032] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An adjustable pull-off force testing tooling suitable for a plurality of size plunger shoe assembly, characterized by, It comprises two parts of upper clamping structure and lower clamping structure; The upper clamping structure comprises an upper clamping cap and a movable upper pull rod connected with each other; the bottom of the upper clamping cap is provided with a T-shaped cavity with a V-shaped opening, which is used for accommodating a sliding shoe of a piston sliding shoe assembly to be tested; the cross section of the T-shaped cavity gradually decreases from the entrance; when the sliding shoe enters the T-shaped cavity with the V-shaped opening, the sliding shoe is horizontally limited by the V-shaped opening and axially limited by the protrusion on the inner side of the bottom of the T-shaped cavity, so that the sliding shoe is clamped in the upper clamping cap; The lower clamping structure comprises a lower clamping shell, a lower pull rod and a slidable limiting plate; the lower clamping shell is provided with a cavity inside and is connected with the lower pull rod at the bottom; the slidable limiting plate is a pair of right-angled trapezoidal plates placed on the top of the lower clamping shell; when a piston of a piston sliding shoe assembly to be tested is placed in the cavity of the lower clamping shell, the slidable limiting plate is adjusted so that the hypotenuse of the pair of right-angled trapezoidal plates clamps the neck of the piston sliding shoe assembly or the edge part of the piston, and then the slidable limiting plate is fixed on the lower clamping shell by fasteners after being axially limited.

2. The adjustable pull-off force test tooling suitable for multiple size plunger shoe assembly of claim 1, wherein, The two ends of the slidable limiting plate are provided with strip-shaped grooves; by means of the strip-shaped grooves, the installation position of the slidable limiting plate on the lower clamping shell can be changed when the slidable limiting plate is adapted to different piston sliding shoe assemblies to be tested.

3. The adjustable pull force test tooling suitable for multiple size plunger shoe assembly of claim 1, wherein, The top of the upper clamping structure is provided with a T-shaped through groove, and the movable upper pull rod is installed in the T-shaped through groove.

4. The adjustable pull-off force test tool suitable for various size plunger shoe assembly of claim 1, wherein, The lower clamping structure further comprises a pressing plate on the slidable limiting plate, and the pressing plate and the slidable limiting plate are fixed on the lower clamping shell by fasteners.

5. The adjustable pull-off force test tool suitable for various size plunger shoe assembly of claim 1, wherein, The lower clamping shell and the lower pull rod are integrated.

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