CN220932606U

CN220932606U - Clamp

Info

Publication number: CN220932606U
Application number: CN202322852330.0U
Authority: CN
Inventors: 楼飞鹏; 陈玲玲; 朱春燕; 贾晨; 周灏敏; 吴松林; 郭晶
Original assignee: Shanghai Aircraft Manufacturing Co Ltd
Current assignee: Shanghai Aircraft Manufacturing Co Ltd
Priority date: 2023-10-24
Filing date: 2023-10-24
Publication date: 2024-05-10
Anticipated expiration: 2033-10-24

Abstract

The utility model belongs to the technical field of test fixtures, and discloses a fixture which comprises a first connecting piece and a limiting plate, wherein one end of the first connecting piece extends along a first straight line and is arranged on a first output end of a testing machine, the first connecting piece is provided with a mounting channel which is penetrated along a first direction, a side wall of the mounting channel is provided with a working port which is penetrated along a second direction, the first end of a workpiece penetrates through the working port and stretches into the mounting channel, the first straight line is overlapped with the center line of the workpiece, the limiting plate is configured to be abutted against the inner wall of the mounting channel, the first end of the workpiece is adhered to the limiting plate, the second end of the workpiece is arranged on a second output end of the testing machine, the connecting line of the center of the first end of the workpiece and the center of the second end of the workpiece is the center line of the workpiece, and the first output end and the second output end of the testing machine can move oppositely along the first straight line respectively. Through the arrangement, the fixture disclosed by the utility model can assist the testing machine in testing the tensile strength of the workpiece under the bonding condition, and is accurate in result and convenient to operate.

Description

Clamp

Technical Field

The utility model relates to the technical field of test fixtures, in particular to a fixture.

Background

The aircraft electrical wiring interconnect system (ELECTRICAL WIRING interconnection system, EWIS), which corresponds to an aircraft neural network, is used for transmitting electrical energy (including data and signals) between two or more endpoints, and has a range of products including wires, cables, connectors, protective materials, clips, and the like, and has an extremely important role in the flight and safety of the aircraft for transmitting various system signals and electrical energy to the aircraft. The latest transportation aircraft airworthiness regulations determine it as a stand-alone system and introduce a division H specifically concerning EWIS, defining its airworthiness requirements, so that aircraft electrical wiring interconnect system installations must meet stringent requirements, ensuring compliance with the terms. The cable installing support is used for connecting the wire with the aircraft organism or interior trim structure, and the installing support mainly bears the tensile load of cable to the organism in the aircraft take-off or landing process, therefore, the joint strength between installing support and the organism structure is crucial. In addition, the large-scale airliner has about 2 ten thousand cable installation brackets, and the installation environment is complex and various throughout the airliner, so that strict requirements are also put on the structural form, the use mode and the connection strength of the brackets.

Furthermore, weight saving is a constant pursuit of aircraft structures. Conventional mechanical attachment brackets require drilling holes in the attachment locations, are costly to process, and the use of a large number of fasteners can result in weight gain of the aircraft. The regular bonding support (such as CB4001 bonding support developed by Click Bond company) for the aircraft structure has the advantages of regular shape, convenient installation, lower weight gain of the structure and the like, has strong adaptability to bonding positions, and is expected to be applied to EWIS systems of composite aircraft in batches.

However, due to the shaking of the EWIS harness caused by the aircraft taking off, landing, and the sudden wind encountered by the aircraft, the adhesive bracket needs to withstand the out-of-plane tensile load from the cable. If the adhesive support is not firmly adhered to the aircraft structure, the risk of cable falling off or even breaking and the like can be caused. Therefore, it is desirable to evaluate the ability of an adhesive stent to withstand out-of-plane tensile loads.

At present, a reliable method for evaluating the tensile capacity of an adhesive support is not yet found, and the existing clamp cannot meet the experimental requirement of a tensile test of a workpiece under an adhesive condition, and in the tensile test process, the tensile forces born by two ends of the workpiece cannot be kept on the same action line, so that the test result is inaccurate, and a lot of difficulties are brought to the tensile test.

Disclosure of utility model

The utility model aims to provide a clamp which can assist a testing machine to test the tensile strength of a workpiece under the bonding condition, has accurate results and is convenient to operate.

To achieve the purpose, the utility model adopts the following technical scheme:

a clamp, comprising:

One end of the first connecting piece extends along a first straight line and is arranged on a first output end of the testing machine, the first connecting piece is provided with a mounting channel which is penetrated along a first direction, a side wall of the mounting channel is provided with a working port which is penetrated along a second direction, the first end of a workpiece penetrates through the working port and stretches into the mounting channel, the second direction is perpendicular to the first direction and parallel to the first straight line, and the first straight line is superposed with the center line of the workpiece;

The limiting plate is configured to be abutted to the inner wall of the installation channel, the first end of the workpiece is adhered to the limiting plate, the second end of the workpiece is installed on the second output end of the testing machine, a connecting line between the center of the first end of the workpiece and the center of the second end of the workpiece is the center line of the workpiece, and the first output end and the second output end of the testing machine can move in opposite directions along the first straight line respectively.

Optionally, the first connecting piece includes first pull rod and first connecting seat, the one end of first pull rod connect in on the first output of testing machine, the other end can dismantle connect in first connecting seat, the installation passageway set up in the first connecting seat, the axis of first pull rod is first straight line.

Optionally, the fixture further comprises a first nut, the first connecting seat is provided with a first hole, the other end of the first pull rod penetrates through the first hole and is in threaded connection with the first nut, and the first nut is in butt joint with the inner wall of the installation channel.

Optionally, the fixture further comprises a connecting rod, a thread groove is formed in the second end of the workpiece, one end of the connecting rod is in threaded connection with the thread groove, the other end of the connecting rod is connected to the second output end of the testing machine, and the axis of the connecting rod is the first straight line.

Optionally, the fixture further comprises a second connecting piece, one end of the second connecting piece extends along the first straight line and is connected to the second output end of the testing machine, and the other end of the second connecting piece is detachably connected to the connecting rod.

Optionally, the second connecting piece includes the second connecting seat, the second connecting seat is equipped with along the equipment passageway that the first direction link up, set up the locating hole on the lateral wall of equipment passageway, the center of locating hole can with the center of the second end of work piece is just right.

Optionally, the fixture further comprises a second nut, the other end of the connecting rod penetrates through the positioning hole and is in threaded connection with the second nut, and the second nut is in butt joint with the inner wall of the assembly channel.

Optionally, the second connecting piece further includes a second pull rod extending along the first straight line, one end of the second pull rod is connected to the second output end of the testing machine, and the other end of the second pull rod is detachably connected to the side wall of the assembly channel.

Optionally, the fixture further comprises a third nut, the second connecting seat is provided with a second opening, one end of the second pull rod penetrates through the second opening and is in threaded connection with the third nut, and the third nut is in butt joint with the inner wall of the assembly channel.

Optionally, a limiting groove communicated with the operation port is formed in the inner wall of the installation channel, and the limiting plate can be abutted to the inner wall of the limiting groove.

The beneficial effects are that:

The utility model provides a clamp, which comprises a first connecting piece and a limiting plate, wherein one end of the first connecting piece extends along a first straight line and is arranged on a first output end of a testing machine, so that the testing machine can conveniently carry out stretching operation, the first connecting piece is provided with a mounting channel penetrating along a first direction, the mounting channel is used for assembling and assembling a workpiece and the clamp, a working port penetrating along a second direction is formed in the side wall of the mounting channel, the first end of the workpiece penetrates through the working port and stretches into the mounting channel and is then adhered to the limiting plate, the limiting plate is abutted against the inner wall of the mounting channel, the workpiece is limited in the mounting channel and waits for stretching operation, the second end of the workpiece is arranged on a second output end of the testing machine, the first output end and the second output end of the testing machine respectively move along the first straight line, the two ends of the workpiece are respectively subjected to equal sizes, the directions are opposite, the action lines are tensile forces along the first straight line until the workpiece is broken, the tensile strength of the workpiece is obtained through the testing machine, the center of the first end of the workpiece and the center of the second end of the workpiece is the center line of the workpiece is the straight line of the workpiece, the tensile force of the workpiece is the center line of the first straight line, and the center line of the workpiece is the center of the tensile force of the workpiece is the first straight line, and the tensile force of the workpiece is the two ends of the workpiece are opposite directions, and the tensile ends of the tensile test result, and the tensile test result of the workpiece are. Through the arrangement, the fixture disclosed by the utility model can assist the testing machine in testing the tensile strength of the workpiece under the bonding condition, and is accurate in result and convenient to operate.

Drawings

FIG. 1 is an isometric view of a clamp provided by an embodiment of the present utility model;

FIG. 2 is a schematic view of a clamp provided by an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a clamp provided by an embodiment of the present utility model;

FIG. 4 is a schematic view of a workpiece provided by an embodiment of the present utility model;

FIG. 5 is a top view of a workpiece provided by an embodiment of the utility model;

FIG. 6 is a schematic view of a first pull rod according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a first connection base according to an embodiment of the present utility model;

FIG. 8 is a schematic view of a limiting plate according to an embodiment of the present utility model;

FIG. 9 is a schematic view of a second connection base according to an embodiment of the present utility model;

fig. 10 is a schematic view of a second pull rod according to an embodiment of the present utility model.

In the figure:

1. A first connector; 11. a mounting channel; 111. an operation port; 112. a limit groove; 12. a first pull rod; 13. a first connection base; 131. a first opening;

2. a limiting plate; 3. a first nut; 4. a connecting rod;

5. A second connector; 51. a second connecting seat; 511. assembling the channel; 5111. positioning holes; 512. a second opening; 52. a second pull rod;

6. A second nut; 7. a third nut;

100. a workpiece; 101. a thread groove.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1-10, the present embodiment provides a fixture, which includes a first connecting member 1 and a limiting plate 2, wherein one end of the first connecting member 1 extends along a first straight line and is mounted on a first output end of a testing machine, the first connecting member 1 is provided with a mounting channel 11 penetrating along a first direction, a side wall of the mounting channel 11 is provided with a working opening 111 penetrating along a second direction, a first end of a workpiece 100 penetrates through the working opening 111 and extends into the mounting channel 11, the second direction is perpendicular to the first direction and is parallel to the first straight line, the first straight line is overlapped with a center line of the workpiece 100, the limiting plate 2 is configured to abut against an inner wall of the mounting channel 11, a first end of the workpiece 100 is adhered to the limiting plate 2, a second end is mounted on a second output end of the testing machine, a connecting line between the center of the first end of the workpiece 100 and the center of the second end of the workpiece 100 is the center line of the workpiece 100, and the first output end of the testing machine and the second output end of the testing machine can move in opposite directions along the first straight line.

In this embodiment, one end of the first connecting piece 1 extends along a first straight line and is mounted on a first output end of the testing machine, so that the testing machine is convenient to carry out stretching operation, the first connecting piece 1 is provided with a mounting channel 11 penetrating along a first direction, the mounting channel 11 is used for assembling and assembling the workpiece 100 and a clamp, a working opening 111 penetrating along a second direction is formed in the side wall of the mounting channel 11, the first end of the workpiece 100 penetrates through the working opening 111 and stretches into the mounting channel 11 and is then bonded on the limiting plate 2, the limiting plate 2 abuts against the inner wall of the mounting channel 11, and accordingly the workpiece 100 is limited in the mounting channel 11 and waits for stretching operation, the second end of the workpiece 100 is mounted on a second output end of the testing machine, the first output end and the second output end of the testing machine are respectively moved along the first straight line, two ends of the workpiece 100 are respectively equal in size, opposite directions are respectively broken by pulling force along the first straight line until the workpiece 100 is broken, the tensile force of the workpiece 100 is obtained by the testing machine, the center of the first end of the workpiece 100 and the center of the second end of the workpiece 100 is the center line of the workpiece 100 is identical, and the tensile force of the two ends of the workpiece 100 is accurately coincident with each other on the straight line, and the tensile force of the workpiece 100 is ensured. Through the arrangement, the fixture disclosed by the application can assist the testing machine in testing the tensile strength of the workpiece 100 under the bonding condition, and is accurate in result and convenient to operate.

Specifically, in the present embodiment, the first direction is a horizontal direction and the second direction is a vertical direction, so that the workpiece 100 is convenient for a tensile test. In other embodiments, the first direction and the second direction can be adjusted by those skilled in the art based on the above technical solutions, so long as the stretching operation is convenient, and no limitation is made herein. Further, as shown in fig. 4 and 5, in the present embodiment, the work 100 is composed of a circular chassis and a cylindrical metal joint, in which a screw thread is provided for fixing a cable. In other embodiments, the specific composition and shape of the workpiece 100 may be adjusted according to the actual manufacturing operation, without undue limitations.

Specifically, as shown in fig. 1-3, 6 and 7, the first connecting piece 1 includes a first pull rod 12 and a first connecting seat 13, one end of the first pull rod 12 is connected to a first output end of the testing machine, the other end of the first pull rod 12 is detachably connected to the first connecting seat 13, so that an operator can assemble and disassemble the components conveniently, and meanwhile, the moving stroke of the output end of the testing machine can be reduced by arranging the first pull rod 12 and the first connecting seat 13, and the testing is facilitated. The installation passageway 11 sets up in first connecting seat 13, and the axis of first pull rod 12 is first straight line, moves in order to tensile first pull rod 12 in first straight line direction through the testing machine, and then guarantees that work piece 100 receives the pulling force in tensile in-process and is in first straight line direction all the time, has improved the accuracy of test result, and simultaneously, the operating personnel also can be through observing whether first pull rod 12 is on first straight line, and then adjusts the tensile operation of work piece 100.

More specifically, as shown in fig. 1 to 3, in the present embodiment, the fixture further includes a first nut 3, the first connecting seat 13 is provided with a first opening 131, and the other end of the first pull rod 12 passes through the first opening 131 and is screwed to the first nut 3, and the first nut 3 abuts against the inner wall of the mounting channel 11. Through the arrangement, the first pull rod 12 and the first connecting seat 13 are detachably connected, and the installation and the detachment are more convenient and quick. In other embodiments, the first pull rod 12 and the first connecting seat 13 may be detachably connected by a clamping manner, so long as the above function can be achieved, which is not limited herein.

Specifically, as shown in fig. 1-5, the fixture further includes a connecting rod 4, and a thread groove 101 is disposed in the second end of the workpiece 100, and due to the characteristics of the workpiece 100, the chuck of the testing machine is inconvenient to be directly connected to the workpiece 100, and one end of the connecting rod 4 is screwed to the thread groove 101, and the other end is connected to the second output end of the testing machine, so that the workpiece 100 can be smoothly connected to the testing machine in the tensile test process, and the tensile test can be smoothly performed. In addition, because the axis of connecting rod 4 is first straight line, coincide in the tensile direction of testing machine output, can further guarantee the accuracy of tensile test result, the operation of being convenient for more.

Specifically, as shown in fig. 1-3, the fixture further includes a second connecting member 5, one end of the second connecting member 5 extends along a first straight line and is connected to a second output end of the testing machine, and the other end of the second connecting member 5 is detachably connected to the connecting rod 4. Through setting up second connecting piece 5, can cooperate with first connecting piece 1, guarantee that the connecting elements at work piece 100 both ends can keep relative symmetry, because above-mentioned part itself has certain weight, through above-mentioned setting for the tensile force that work piece 100 both ends received keeps equally, is favorable to the tensile test of work piece 100, and the result is more accurate.

Specifically, as shown in fig. 1-9, the second connecting piece 5 includes a second connecting seat 51, the second connecting seat 51 is provided with an assembly channel 511 penetrating along the first direction, the assembly channel 511 is used for connecting the connecting rod 4 with the second connecting seat 51, so that an operator can assemble conveniently, a positioning hole 5111 is formed in the side wall of the assembly channel 511, the center of the positioning hole 5111 can be opposite to the center of the second end of the workpiece 100, the tensile force applied to the workpiece 100 in the stretching process is further ensured to be always in the first linear direction, and the accuracy of the test result is improved.

More specifically, as shown in fig. 1 to 3, the clamp further includes a second nut 6, and the other end of the connecting rod 4 passes through the positioning hole 5111 and is screwed to the second nut 6, and the second nut 6 abuts against the inner wall of the assembly channel 511. Through the arrangement, the connection of the connecting rod 4 and the second connecting seat 51 can be detached, and the installation and the detachment are more convenient and quick. In other embodiments, the connecting rod 4 and the second connecting seat 51 may be detachably connected by a screw, so long as the above function can be achieved, which is not limited herein.

Specifically, as shown in fig. 1 to 10, the second connector 5 further includes a second pull rod 52 extending along the first line, one end of the second pull rod 52 is connected to the second output end of the testing machine, and the other end is detachably connected to the side wall of the assembly channel 511. The second pull rod 52 is stretched by the testing machine to move in the first linear direction, so that the second connecting seat 51 and the workpiece 100 are driven to move along the first linear direction, the tensile force applied to the workpiece 100 in the stretching process is always in the first linear direction, the accuracy of a test result is improved, and meanwhile, an operator can also adjust the stretching operation of the workpiece 100 by observing whether the second pull rod 52 is in the first linear direction or not.

More specifically, as shown in fig. 1 to 3, the fixture further includes a third nut 7, the second connecting seat 51 is provided with a second opening 512, one end of the second pull rod 52 passes through the second opening 512 and is screwed to the third nut 7, and the third nut 7 abuts against the inner wall of the assembly channel 511. Through the arrangement, the second pull rod 52 and the second connecting seat 51 are detachably connected, and the installation and the detachment are more convenient and quicker. In other embodiments, the second pull rod 52 and the second connecting seat 51 may be detachably connected by a screw, so long as the above function can be achieved, which is not limited herein.

Specifically, as shown in fig. 2, the inner wall of the installation channel 11 is provided with a limit groove 112 communicated with the operation port 111, and the limit plate 2 is accommodated in the limit groove 112 and can be abutted against the inner wall of the limit groove 112, so that one end of the workpiece 100 bonded with the limit plate 2 cannot be separated from the installation channel 11, and meanwhile, the workpiece 100 can be ensured to maintain certain stability in the stretching operation process without shaking, and the accuracy of the stretching test is affected.

The specific use process of the clamp is described below:

Step one, preparing a workpiece 100:

One end of the workpiece 100 is inserted into the mounting channel 11 through the operation port 111, and the workpiece 100 is adhered to the limiting plate 2, and the limiting plate 2 is placed in the limiting groove 112, so that the workpiece 100 is limited on the first connecting seat 13.

Step two, preparation of a tensile test:

The first pull rod 12 is screwed on the first connecting seat 13 through the first nut 3, and the first pull rod 12 is arranged on a chuck of the testing machine;

the connecting rod 4 is screwed to the other end of the workpiece 100, then the second pull rod 52 is screwed to the second connecting seat 51 through the third nut 7, and the second pull rod 52 is installed on the other chuck of the testing machine;

The positions of the two chucks of the testing machine are adjusted so that the positioning holes 5111 are opposite to the center of the end face of the other end of the workpiece 100, then one end of the connecting rod 4 is inserted into the assembly channel 511, and the connecting rod 4 is screwed onto the second connecting seat 51 through the second nut 6.

Step three, tensile test:

The tester tensile program is set, the tensile load is applied by the tester collet, and at the same time, the load is collected and recorded in real time by the tester until the workpiece 100 is damaged. After the experiment is finished, the peak load measured by the testing machine is read, so that the tensile capacity of the workpiece 100 is obtained.

By the arrangement, the clamp disclosed by the application can be used for testing the tensile strength of the bonding support of the electric circuit interconnection system, so that the accuracy and the repeatability of the bonding strength test result are ensured, and when the workpiece 100 (the bonding support) is pulled to be damaged, an operator can replace the workpiece 100 (the bonding support) and the limiting plate 2, thereby realizing the repeatability of a tensile test.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. The anchor clamps, its characterized in that includes:

The first connecting piece (1) is provided with a mounting channel (11) which is penetrated along a first direction, the side wall of the mounting channel (11) is provided with a working opening (111) which is penetrated along a second direction, the first end of the workpiece (100) penetrates through the working opening (111) and stretches into the mounting channel (11), and the second direction is perpendicular to the first direction and parallel to the first straight line, and the first straight line is overlapped with the center line of the workpiece (100);

Limiting plate (2) is configured to butt in the inner wall of installation passageway (11), the first end of work piece (100) bond in limiting plate (2), the second end install in the second output of test machine, the line of the center of the first end of work piece (100) with the center of the second end of work piece (100) is the center line of work piece (100), the first output and the second output of test machine can be respectively followed first straight line motion in opposite directions.

2. The fixture according to claim 1, wherein the first connecting piece (1) comprises a first pull rod (12) and a first connecting seat (13), one end of the first pull rod (12) is connected to the first output end of the testing machine, the other end of the first pull rod is detachably connected to the first connecting seat (13), the mounting channel (11) is arranged in the first connecting seat (13), and the axis of the first pull rod (12) is the first straight line.

3. The clamp according to claim 2, further comprising a first nut (3), wherein the first connecting seat (13) is provided with a first opening (131), the other end of the first pull rod (12) passes through the first opening (131) and is screwed to the first nut (3), and the first nut (3) is abutted against the inner wall of the mounting channel (11).

4. The fixture according to claim 1, further comprising a connecting rod (4), wherein a thread groove (101) is formed in the second end of the workpiece (100), one end of the connecting rod (4) is screwed into the thread groove (101), the other end of the connecting rod is connected to the second output end of the testing machine, and the axis of the connecting rod (4) is the first straight line.

5. The clamp according to claim 4, characterized in that it further comprises a second connecting element (5), one end of the second connecting element (5) extending along a first straight line and being connected to a second output end of the testing machine, the other end of the second connecting element (5) being detachably connected to the connecting rod (4).

6. The fixture according to claim 5, wherein the second connecting member (5) comprises a second connecting seat (51), the second connecting seat (51) is provided with an assembly channel (511) penetrating along the first direction, a positioning hole (5111) is formed in the side wall of the assembly channel (511), and the center of the positioning hole (5111) can be opposite to the center of the second end of the workpiece (100).

7. The clamp according to claim 6, further comprising a second nut (6), the other end of the connecting rod (4) passing through the positioning hole (5111) and being screwed to the second nut (6), the second nut (6) abutting against the inner wall of the assembly channel (511).

8. The clamp according to claim 6, characterized in that the second connecting piece (5) further comprises a second pull rod (52) extending along the first straight line, the second pull rod (52) being connected at one end to the second output end of the testing machine and at the other end to the side wall of the assembly channel (511).

9. The clamp according to claim 8, further comprising a third nut (7), wherein the second connecting seat (51) is provided with a second opening (512), one end of the second pull rod (52) passes through the second opening (512) and is screwed to the third nut (7), and the third nut (7) is abutted against the inner wall of the assembly channel (511).

10. The clamp according to any one of claims 1-9, characterized in that a limit groove (112) communicated with the operation port (111) is formed in the inner wall of the installation channel (11), and the limit plate (2) can be abutted against the inner wall of the limit groove (112).