Clamping mechanism, detection tool and detection device

Abstract

The invention relates to a clamping mechanism, a detection tool and a detection device.The clamping mechanism comprises a positioning piece, the positioning piece is provided with a base body part and a plurality of pressing connection parts extending along one side of the base body part, a first containing cavity is formed in the base body part, an extrusion space is defined by the multiple pressing connection parts, and the extrusion space communicates with the first containing cavity; a first assembly structure is arranged on the outer surface of the base body part; the limiting piece is provided with a sleeving part and a limiting part which are sequentially arranged in the height direction, a first center hole is formed in the middle of the sleeving part, a second center hole is formed in the middle of the limiting part, the hole wall of the second center hole is a first conical surface, and a second assembly structure is arranged on the hole wall of the first center hole; when the base body part is partially located in the first center hole, the outer surface of each crimping part is tightly attached to the hole wall of the second center hole, and the first assembling structure and the second assembling structure are detachably and fixedly connected. In this way, the problem that an existing tension testing device cannot clamp the plunger is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile testing, and in particular to a clamping mechanism, a testing tool and a testing device. Background Art

[0002] The plunger assembly is the core component for the plunger pump to realize its functions. The plunger and the sliding shoe are connected by the "plunger closing production technology" to form a ball joint. The plunger assembly has to withstand oil pressure, centrifugal force, inertia force, return force, friction force and vertical reaction force of the swash plate during movement. It is the component with the most complex force and the worst working conditions in the oil pump. Therefore, during the production process, it is necessary to measure the pull-off force of the plunger assembly after the closing is completed to check whether the pull-off force of the batch of plunger assemblies meets the technical requirements.

[0003] Since the plunger assembly parts are small in size, the outer surface of the plunger is very smooth, and the sliding shoe is made of copper-plated silver material with a soft texture, it cannot be clamped using tensile testing equipment. Therefore, it is necessary to make auxiliary clamping tooling with a harder surface for equipment clamping, and at the same time be able to hold the plunger assembly tightly for tensile testing. Summary of the invention

[0004] In order to solve the problem that the existing tensile testing equipment cannot clamp the plunger, the present invention provides a clamping mechanism, a detection tool and a detection device.

[0005] In a first aspect, the present invention provides a clamping mechanism, comprising:

[0006] A positioning member, the positioning member having a base portion and a plurality of crimping portions extending along one side of the base portion, a first accommodating cavity being provided in the base portion, the plurality of crimping portions being symmetrically arranged along the circumference of the base portion, a gap being provided between two adjacent crimping portions, and an extrusion space being enclosed by the plurality of crimping portions, the extrusion space being communicated with the first accommodating cavity, and a first assembly structure being provided on an outer surface of the base portion;

[0007] A limiter, wherein the limiter has a sleeve-fitting portion and a limiter arranged in sequence along the height direction, a first center hole extending along the height direction is provided in the middle of the sleeve-fitting portion, a second center hole extending along the height direction is provided in the middle of the limiter, the first center hole is connected to the second center hole, and a hole wall of the second center hole is a first conical surface; along the height direction, an end of the second center hole with a larger cross section faces the first center hole, and a second assembly structure is provided on the hole wall of the first center hole;

[0008] Wherein, when the base portion is partially located in the first center hole, the outer surface of each crimping portion is tightly fitted with the hole wall of the second center hole, and the first assembly structure and the second assembly structure are detachably fixedly connected.

[0009] In some embodiments, the outer side walls of the crimping portions are combined to form a second conical surface, and the taper of the second conical surface is the same as the taper of the first conical surface.

[0010] In some embodiments, an inner side wall of each crimping portion is formed with an annular first limiting boss, and the first limiting boss is extended from an end of the crimping portion away from the base portion.

[0011] In some embodiments, the base portion is sequentially provided with a main body portion and a connecting portion along the height direction, a plurality of the crimping portions are arranged on the connecting portion, and an end located away from the main body portion is extended along the height direction, the first assembly structure is arranged on the connecting portion, and the main body portion is used to connect a tensile testing machine.

[0012] In some embodiments, the first assembly structure is an external thread, the second assembly structure is an internal thread, and the positioning member is connected to the limiting member in a threaded manner.

[0013] On the other hand, the present invention provides a detection tool, which is applied to a plunger shoe assembly, comprising:

[0014] A clamping mechanism as described above; and,

[0015] A gripping mechanism, wherein the gripping mechanism comprises a bearing member, wherein a second accommodating cavity is disposed in the bearing member, wherein the second accommodating cavity is disposed through the bearing member in a height direction, wherein a second limiting boss is convexly disposed at the bottom of an inner side wall of the second accommodating cavity, wherein an opening of the second accommodating cavity located on the side where the second limiting boss is located is disposed opposite to the second center hole in a height direction;

[0016] Wherein, the plunger of the plunger and slide shoe assembly is limited in the first accommodating cavity by the crimping parts, and the slide shoe of the plunger and slide shoe assembly is limited in the second accommodating cavity by the second limiting boss.

[0017] In some embodiments, the second limiting boss is arranged around the circumference of the inner wall of the second accommodating cavity in a direction perpendicular to the height direction.

[0018] In some embodiments, there are a plurality of second limiting bosses, and each of the second limiting bosses is arranged at equal intervals around the inner side wall of the second accommodating cavity along a direction perpendicular to the height.

[0019] In some embodiments, the bearing member is provided with an action portion and a pull rod portion in sequence along the height direction, the second limiting boss is located in the second accommodating cavity on the side where the action portion is located, and the pull rod portion is used to connect to a tensile testing machine.

[0020] In a third aspect, the present invention provides a detection device applied to a plunger shoe assembly, including a tensile testing machine, and the detection tooling as described above connected to the tensile testing machine.

[0021] In order to solve the problem that the existing tensile testing equipment cannot clamp the plunger, the present invention has the following advantages:

[0022] Through the technical solution of the present invention, the plurality of crimping parts of the positioning member are closed by using a limiting member, so that the plunger of the plunger shoe assembly can be clamped more tightly, and there is no need to design a more complicated structure for limiting the plunger of the plunger shoe assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural schematic diagram of a clamping mechanism is shown;

[0024] Figure 2 Shows Figure 1 A schematic structural diagram of the positioning member at another angle shown in FIG.

[0025] Figure 3 A structural schematic diagram of the grabbing mechanism is shown.

[0026] Figure markings: 10-clamping mechanism; 11-positioning member; 111-base portion; A-main body; B-connecting portion; 1111-first accommodating cavity; 1112-first assembling structure; 112-crimping portion; 12-limiting member; 121-fitting portion; 1211-first center hole; 122-limiting portion; 1221-second center hole; 20-grasping mechanism; 21-carrying member; 211-second accommodating cavity; 2111-second limiting boss; H-height direction. DETAILED DESCRIPTION

[0027] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0028] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0029] As one of the important components of the missile, the hydraulic steering gear uses high-pressure oil as its working medium to drive the product to move. The working performance of the steering gear directly affects the working performance of the missile. The hydraulic pump, as the heart of the electro-hydraulic steering gear, provides high-pressure oil for the electro-hydraulic steering gear, which directly affects the working performance and reliability of the steering gear.

[0030] The hydraulic pump model products have been developed for a long time. During the running-in process, the plunger assembly is often pulled off. As a key component of the hydraulic pump, the plunger assembly has complex reasons for pulling off, and insufficient pull-off force is one of them. However, measuring the pull-off force of the plunger assembly is of great significance for analyzing the working pressure and performance of the hydraulic pump.

[0031] Through the existing tensile testing machine, the author focuses on solving the problems that the existing tensile testing machine cannot clamp the plunger combination, the outer circle of the plunger combination is smooth, and the texture of the sliding shoe is relatively soft, and designs a tooling auxiliary clamping. The tooling can better clamp the plunger and provide a better force point for the sliding shoe to achieve the measurement effect.

[0032] like Figure 1 and Figure 2 As shown, this embodiment discloses a clamping mechanism 10, comprising:

[0033] A positioning member 11, wherein the positioning member 11 has a base portion 111 and a plurality of crimping portions 112 extending along one side of the base portion 111, wherein a first accommodating cavity 1111 is provided in the base portion 111, wherein the plurality of crimping portions 112 are symmetrically arranged along the circumference of the base portion 111, wherein a gap is provided between two adjacent crimping portions 112, and wherein an extrusion space is formed between the plurality of crimping portions 112, wherein the extrusion space is communicated with the first accommodating cavity 1111, and wherein a first assembly structure 1112 is provided on an outer surface of the base portion 111;

[0034] The limiting member 12 comprises a sleeve-fitting portion 121 and a limiting portion 122 which are sequentially arranged along the height direction H, a first center hole 1211 extending along the height direction H is provided in the middle of the sleeve-fitting portion 121, a second center hole 1221 extending along the height direction H is provided in the middle of the limiting portion 122, the first center hole 1211 is connected to the second center hole 1221, and the hole wall of the second center hole 1221 is a first conical surface; along the height direction H, the end with a larger cross section of the sixth center hole faces the first center hole 1211, and the hole wall of the first center hole 1211 is provided with a second assembly structure;

[0035] When the base portion 111 is partially located in the first center hole 1211 , the outer surface of each crimping portion 112 is tightly fitted with the hole wall of the second center hole 1221 , and the first assembly structure 1112 and the second assembly structure are detachably fixedly connected.

[0036] In the present embodiment, a clamping mechanism 10 is provided, and the clamping mechanism 10 is used to clamp the plunger of the plunger shoe assembly. When the base portion 111 of the positioning member 11 partially extends into the first center hole 1211 of the sleeve portion 121 of the limiting member 12, the multiple crimping portions 112 of the positioning member 11 all extend into the second center hole 1221 of the limiting portion 122 of the limiting member 12, so that the outer surface of each crimping portion 112 is tightly fitted with the hole wall of the second center hole 1221, thereby forcing each crimping portion 112 to shrink inward around the extrusion space to complete the positioning and clamping of the outer surface of the plunger placed in the first accommodating cavity 1111; at the same time, the first assembly structure 1112 disposed on the outer surface of the base portion 111 is used to contact the hole wall of the first center hole 1211. The second assembly structure is detachably fixedly connected, so that the limiting member 12 can close the multiple crimping parts 112 of the positioning member 11, which can achieve a relatively tight clamping of the plunger of the plunger shoe assembly, and there is no need to design a more complicated structure for limiting the plunger of the plunger shoe assembly; furthermore, by using multiple crimping parts 112 to be symmetrically arranged along the circumference of the base part 111, when the multiple crimping parts 112 are closed, each crimping part 112 simultaneously or partially contacts the plunger of the plunger shoe assembly. When partial contact occurs, the contacting crimping part 112 will correct the position of the plunger of the plunger shoe assembly, thereby achieving accurate positioning of the position of the plunger. In the present application, four crimping parts 112 are preferably used, so that the plunger of the plunger shoe assembly is symmetrically fixed in the first accommodating cavity 1111 along the height direction H.

[0037] In some embodiments, the outer side walls of the crimping portions 112 are combined to form a second conical surface, and the taper of the second conical surface is the same as the taper of the first conical surface.

[0038] In this embodiment, through the above-mentioned structural setting, the outer surface of each crimping portion 112 can be quickly and tightly fitted with the hole wall of the second center hole 1221, thereby achieving precise positioning and improving assembly efficiency.

[0039] In some embodiments, an inner side wall of each crimping portion 112 is formed with an annular first limiting boss, and the first limiting boss is extended from an end of the crimping portion 112 away from the base portion 111 .

[0040] In this embodiment, through the above arrangement, during the installation of the plunger of the plunger shoe assembly, the first limiting bosses on each crimping portion 112 can abut against the outer surface of the plunger, thereby achieving clamping of the plunger.

[0041] In some embodiments, the base portion 111 is sequentially provided with a main body portion A and a connecting portion B along the height direction H, and the plurality of crimping portions 112 are all provided on the connecting portion B, and the end located away from the side where the main body portion A is located is extended along the height direction H, the first assembly structure 1112 is provided on the connecting portion B, and the main body portion A is used to connect a tensile testing machine.

[0042] In this embodiment, through the above arrangement, the positioning member 11 can be connected to the tensile testing machine through the main body A, wherein the outer surface of the main body A is provided with a thread or a mesh structure to increase friction and facilitate clamping by the tensile testing machine. In the present application, a limiting structure is also provided on the main body A, and the limiting structure is used to cooperate with the tensile testing machine to limit the rotation of the positioning member 11 along the height direction H. Among them, the limiting structure can be a limiting surface or other implementable structure, and the present application is not limited thereto.

[0043] In some embodiments, the first assembly structure 1112 is an external thread, the second assembly structure is an internal thread, and the positioning member 11 is connected to the limiting member 12 in a threaded manner.

[0044] In this embodiment, through the above-mentioned arrangement, the positioning member 11 and the limiting member 12 can be connected through threaded cooperation to improve the assembly or disassembly efficiency between the positioning member 11 and the limiting member 12, thereby realizing the rapid clamping or disassembly of the plungers of multiple plunger slipper assemblies, thereby reducing the assembly or disassembly time during the detection process.

[0045] On the other hand, this embodiment also discloses a detection tool, such as Figure 2 and Figure 3 As shown, the detection tool includes the above-mentioned clamping mechanism 10; and,

[0046] The gripping mechanism 20 includes a carrier 21, a second accommodating cavity 211 is provided in the carrier 21, the second accommodating cavity 211 is arranged to penetrate the carrier 21 along the height direction H, a second limiting boss 2111 is convexly provided at the bottom of the inner side wall of the second accommodating cavity 211, and the opening of the second accommodating cavity 211 on the side where the second limiting boss 2111 is located is arranged opposite to the second center hole 1221 along the height direction H;

[0047] The plunger of the plunger and shoe assembly is limited in the first accommodating cavity 1111 by the crimping portions 112 , and the shoe of the plunger and shoe assembly is limited in the second accommodating cavity 211 by the second limiting boss 2111 .

[0048] In this embodiment, in the process of detecting the pull-off force of the plunger shoe assembly, in order to reduce the time spent by humans in the assembly process, the shoe of the plunger shoe assembly can also be quickly moved by the gripping mechanism 20 to improve the assembly efficiency. In this application, a second accommodating cavity 211 is provided in the carrier 21, and a second limiting boss 2111 is convexly provided at the bottom of the second accommodating cavity 211. The shoe of the plunger shoe assembly is placed in the second accommodating cavity 211, so that the shoe of the plunger shoe assembly is clamped on the second limiting boss 2111; wherein the plunger of the plunger shoe assembly passes through the second accommodating cavity 211 and is placed in the first accommodating cavity 1111, and is clamped by the multiple crimping parts 112 of the clamping mechanism 10.

[0049] In some embodiments, the second limiting boss 2111 is arranged along a circumference perpendicular to the height direction H and surrounding the inner wall of the second accommodating cavity 211 .

[0050] In this embodiment, through the above arrangement, the sliding shoe has a step surface on the side where the plunger is located, and the sliding shoe abuts against the second limiting boss 2111 through the step surface, so as to limit the sliding shoe in the second accommodating cavity along the height direction H. Among them, since the second limiting boss 2111 is arranged around the inner side wall of the second accommodating cavity 211 to increase the contact area between the step surface of the sliding shoe and the second limiting boss 2111, the bearing member 21 provides a relatively sufficient supporting force, so as to complete the subsequent pull-off force detection of the plunger sliding shoe assembly.

[0051] In some embodiments, there are multiple second limiting bosses 2111 , and each of the second limiting bosses 2111 is arranged at equal intervals along a circumference perpendicular to the height direction H and around the inner wall of the second accommodating cavity 211 .

[0052] In this embodiment, through the above arrangement, the sliding shoe has a step surface on the side where the plunger is located, and the sliding shoe abuts against the plurality of second limiting bosses 2111 through the step surface, so as to limit the sliding shoe in the second accommodating cavity along the height direction H. Among them, since the plurality of second limiting bosses 2111 are arranged around the inner side wall of the second accommodating cavity 211, the contact area between the step surface of the sliding shoe and the supporting member can also be increased, so that the bearing member 21 provides a relatively sufficient supporting force, so as to complete the subsequent pull-off force detection of the plunger sliding shoe assembly.

[0053] In some embodiments, the supporting member 21 is provided with an action portion and a pull rod portion in sequence along the height direction H, the second limiting boss 2111 is located in the second accommodating cavity 211 on the side where the action portion is located, and the pull rod portion is used to connect to a tensile testing machine.

[0054] In this embodiment, through the above-mentioned arrangement, it is possible to connect the support member 21 to the tensile testing machine through the pull rod portion, wherein the outer surface of the action portion is provided with a threaded or mesh structure to increase the friction force, so as to facilitate the cooperation and clamping with the tensile testing machine, and at the same time to limit the rotation of the support member 21 along the height direction H.

[0055] On the other hand, this embodiment also provides a detection device for detecting the pull-off force of a plunger sliding shoe assembly, including a tension testing machine and the detection tooling described in the above embodiment connected to the tension testing machine.

[0056] In summary, through the technical solution of the present invention, the multiple crimping parts of the positioning member are closed by using a limit member, so that the plunger of the plunger shoe assembly can be clamped more tightly, and there is no need to design a more complicated structure for limiting the plunger of the plunger shoe assembly.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0058] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A clamping mechanism, characterized in that: include: A positioning member, the positioning member having a base portion and a plurality of crimping portions extending along one side of the base portion, a first accommodating cavity being provided in the base portion, the plurality of crimping portions being symmetrically arranged along the circumference of the base portion, a gap being provided between two adjacent crimping portions, and an extrusion space being enclosed by the plurality of crimping portions, the extrusion space being communicated with the first accommodating cavity, and a first assembly structure being provided on an outer surface of the base portion; A limiter, wherein the limiter has a sleeve-fitting portion and a limiter arranged in sequence along the height direction, a first center hole extending along the height direction is provided in the middle of the sleeve-fitting portion, a second center hole extending along the height direction is provided in the middle of the limiter, the first center hole is connected to the second center hole, and a hole wall of the second center hole is a first conical surface; along the height direction, an end of the second center hole with a larger cross section faces the first center hole, and a second assembly structure is provided on the hole wall of the first center hole; Wherein, when the base portion is partially located in the first center hole, the outer surface of each crimping portion is tightly fitted with the hole wall of the second center hole, and the first assembly structure and the second assembly structure are detachably fixedly connected.

2. The clamping mechanism according to claim 1, characterized in that: The outer side walls of the crimping portions are combined to form a second conical surface, and the taper of the second conical surface is the same as the taper of the first conical surface.

3. The clamping mechanism according to claim 1, characterized in that: An inner side wall of each crimping portion is formed with an annular first limiting boss, and the first limiting boss is extended from one end of the crimping portion away from the base portion.

4. The clamping mechanism according to claim 1, characterized in that: The base portion is sequentially provided with a main body portion and a connecting portion along the height direction, a plurality of the crimping portions are all provided on the connecting portion, and one end located away from the main body portion is extended along the height direction, the first assembly structure is provided on the connecting portion, and the main body portion is used to connect a tensile testing machine.

5. The clamping mechanism according to any one of claims 1 to 4, characterized in that: The first assembly structure is an external thread, the second assembly structure is an internal thread, and the positioning member is connected to the limiting member in a threaded manner.

6. A detection tool, applied to a plunger shoe assembly, characterized in that: include: The clamping mechanism according to any one of claims 1 to 5; and A gripping mechanism, wherein the gripping mechanism comprises a bearing member, wherein a second accommodating cavity is disposed in the bearing member, wherein the second accommodating cavity is disposed through the bearing member in a height direction, wherein a second limiting boss is convexly disposed at the bottom of an inner side wall of the second accommodating cavity, wherein an opening of the second accommodating cavity located on the side where the second limiting boss is located is disposed opposite to the second center hole in a height direction; Wherein, the plunger of the plunger and slide shoe assembly is limited in the first accommodating cavity by the crimping parts, and the slide shoe of the plunger and slide shoe assembly is limited in the second accommodating cavity by the second limiting boss.

7. The detection tooling according to claim 6, characterized in that: The second limiting boss is arranged around the inner wall of the second accommodating cavity in a direction perpendicular to the height direction.

8. The detection tool as claimed in claim 6, characterized in that: There are a plurality of second limiting bosses, and each of the second limiting bosses is arranged at equal intervals around the inner side wall of the second accommodating cavity along a direction perpendicular to the height.

9. The detection tool as claimed in claim 6, characterized in that: The bearing member is provided with an action portion and a pull rod portion in sequence along the height direction, the second limiting boss is located in the second accommodating cavity on the side where the action portion is located, and the pull rod portion is used to connect to a tensile testing machine.

10. A detection device, applied to a plunger shoe assembly, characterized in that: It comprises a tensile testing machine and a detection tool as described in any one of claims 6 to 9 connected to the tensile testing machine.

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