CN214703706U - Test fixture - Google Patents

Abstract

The application discloses test fixture, including first mould and the second mould that is located first mould one side, be equipped with the installed part that is used for installing the product on the second mould, and the installed part is made by conducting material, be equipped with first briquetting on first mould, first briquetting passes through elastic component and first mould elastic connection, first connecting piece has on the product, when the product is installed in the installed part of second mould, first briquetting is at least partly just to first connecting piece, when first mould and second mould do not compound die, first briquetting receives the promotion of elastic component and is separated from between the first mould and have the interval, when first mould and second mould compound die, the elastic component receives the compression and promotes first briquetting and at least partly compress tightly on first connecting piece, thereby make and form the electricity between product and the installed part and be connected. The application of the test fixture realizes controllable adjustment on the pressing force of the pressing block through the elastic piece, and the pressing block is simple in structure, low in production cost, low in assembly difficulty and long in service life.

Description

Test fixture

Technical Field

The utility model relates to an electronic product test field, concretely relates to test fixture.

Background

In the production of electronic products, it is generally necessary to test the electrical conductivity of a product to which a conductive connecting sheet is connected before the product is shipped. The test fixture generally includes an upper die and a lower die, on which a mounting member is provided, the mounting member being made of a conductive material, for example, the mounting member may be a copper block. After the product is mounted on the mounting member, the conductive connecting piece on the product and the mounting member may not be in sufficient contact due to the residual stress of the connecting piece. Therefore, after the upper die and the lower die are assembled, the first connecting piece is pressed on the mounting piece through the first pressing piece of the upper die, and therefore the product is electrically connected with the mounting piece. However, the pressing block part of the existing test fixture has the disadvantages of complex structure, high production cost, high assembly difficulty, short service life of the pressing block, uncontrollable pressing force of the pressing block and limited product compatibility.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a test fixture realizes controllable the regulation through the packing force of elastic component to the briquetting, and the simple structure of briquetting part, low in production cost, the assembly degree of difficulty is low, long service life.

The embodiment of the utility model provides a test fixture for the test has the product of conductive connection piece, include:

a first mold;

the second die is positioned on one side of the first die, and a mounting piece for mounting the product is arranged on the second die and is made of a conductive material; and

the first pressing block is arranged on the first die and is elastically connected with the first die through an elastic piece;

wherein the conductive connection piece comprises a first connection piece, and the first pressing piece is at least partially opposite to the first connection piece;

when the first mold and the second mold are not closed, the first pressing block is pushed by the elastic piece to be separated from the first mold by a distance;

when the first die and the second die are closed, the elastic piece is compressed and pushes the first pressing piece to be at least partially pressed on the first connecting piece, so that the electric connection between the product and the mounting piece is formed.

In some embodiments, the first press block includes a first end, a second end opposite the first end, and a middle portion between the first end and the second end;

the first end is opposite to the first connecting piece;

the middle part is elastically connected with the first die through the elastic piece;

the second end is rotatably connected with the first mold.

In some embodiments, the first end extends from the middle portion toward the second die.

In some embodiments, the molding machine further comprises a bracket and a rotating shaft, the bracket is convexly arranged on the surface of the first mold facing the second mold, and the rotating shaft is arranged through the bracket and the second end of the first pressing block, so that the first pressing block is pivoted with the first mold;

the middle part and the first end rotate relative to the rotating shaft so as to be separated from the first die or pressed on the product.

In some embodiments, further comprising:

the probe module is arranged on the first die and comprises a test head facing the mounting piece;

when the first mold and the second mold are closed, the test head is contacted with the product and reads the conduction parameters of the first connecting sheet.

In some embodiments, further comprising:

the cover plate is arranged on the second die and located on one side of the mounting piece, and the cover plate is used for fixing the product on the mounting piece.

In some embodiments, the cover plate includes a third end and a fourth end opposite the third end;

the third end is rotationally connected with the second die;

the fourth end is arranged to rotate relative to the second die so as to be opened and closed on the mounting piece.

In some embodiments, further comprising:

the sliding block is movably arranged on the second die and is positioned in the groove on one side of the mounting piece;

the second pressing block is convexly arranged on the sliding block and extends towards the mounting piece;

the roller is convexly arranged on the sliding block;

the first die is provided with a protrusion and an inclined plane push block extending to one side of the roller, and when the first die and the second die move in opposite directions and are closed, the inclined plane push block drives the roller to rotate and drives the sliding block to move towards the mounting piece;

the conductive connecting piece further comprises a second connecting piece, and the second pressing piece and the sliding block synchronously move towards the mounting piece, so that the second connecting piece is pressed on the mounting piece after the first die and the second die are combined.

In some embodiments, further comprising:

the third pressing block is convexly arranged on the first die and extends towards the mounting piece;

the fourth pressing block is convexly arranged on the first die and extends towards the mounting piece;

the conductive connecting piece further comprises a third connecting piece and a fourth connecting piece, and after the first die and the second die are closed, the third pressing block presses the third connecting piece on the mounting piece, and the fourth pressing block presses the fourth connecting piece on the mounting piece.

In some embodiments, further comprising:

a guide post disposed on the first mold or the second mold;

a guide hole provided on the second mold or the first mold;

the guide post is arranged to extend into the guide hole to guide the mold clamping when the mold is clamped.

The utility model discloses test fixture compresses tightly first briquetting in the first connecting piece of product through elastic component elasticity, makes to form the electricity between product and the installed part and is connected, and the packing force is controllable, and the simple structure of briquetting part, low in production cost, the assembly degree of difficulty is low, long service life.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is an exploded view of a test fixture according to an embodiment of the present invention;

fig. 2 is a schematic view of a bottom view of a first mold according to an embodiment of the present invention;

FIG. 3 is a schematic view of the first pressing block and the elastic member according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a product to which the test fixture of the embodiment of the present invention can be applied for testing;

fig. 5 is a schematic structural view of a mounting member according to an embodiment of the present invention;

FIG. 6 is a schematic view of a product mounted on a mounting member according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a first pressing block according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a cover plate according to an embodiment of the present invention;

fig. 9 is a top view of a second mold with a cover plate in a closed state according to an embodiment of the present invention;

fig. 10 is a top view of a second mold with a cover plate in an open state according to an embodiment of the present invention;

fig. 11 is a top view of the second mold with the slide block in the sliding state according to the embodiment of the present invention.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Fig. 1-3 are schematic views of a testing fixture according to an embodiment of the present invention. As shown in fig. 1 and 2, the test fixture includes a first mold 1, a second mold 2 located on one side of the first mold 1, and a first press block 3 disposed on the first mold 1. The second mold 2 is provided with a mounting member 21 for mounting a product, and the mounting member 21 is made of a conductive material. The first pressure piece 3 is at least partially directed towards the mounting 21.

As shown in fig. 3, first press block 3 is elastically connected to first mold 1 by elastic member 34. When the first mold 1 and the second mold 2 are not closed, the first pressing block 3 is pushed by the elastic member 34 to be spaced apart from the first mold 1 (i.e., the state shown in fig. 3). When the first die 1 and the second die 2 are closed, the first pressing block 3 is pressed by the product on the mounting member 21 to be attached to the first die 1, and further the elastic member 34 is compressed. The elastic member 34 is compressed to push the first pressing block 3 at least partially against the product of the mounting member 21. In fig. 3, in order to clearly show the relative positions of the first pressing block 3 and the elastic member 34 with the first mold 1, other structures on the first mold 1 are not shown, so as to avoid the other structures from shielding the first pressing block 3 and the elastic member 34.

The test fixture of the embodiment can be used for testing products with conductive connection sheets, which are commonly found in the structures of electronic products. When the product is mounted on the mounting member 21 of the second mold 2, its conductive connecting piece should be in sufficient contact with the mounting member 21 so that the electrical conductivity of the product can be tested. However, due to residual stress on the conductive connection tabs, they may at least partially tilt out of contact with the mount 21. Therefore, when the first mold 1 and the second mold 2 are closed, the first pressing block 3 presses down the conductive connecting piece and presses the conductive connecting piece to the mounting member 21, so that the product and the mounting member 21 are electrically connected and can be tested.

Wherein the elastic member 34 may be a spring.

As shown in fig. 4 and 5, in this embodiment, product a includes a first attachment tab a1, the first attachment tab a1 extending outwardly from an edge of product a. The mounting member 21 is a block structure, and the mounting member 21 has a first protrusion 21a protruding upward from the main body.

As shown in fig. 6, when the product a is mounted on the mounting member 21, the first connecting piece a1 is located on the first boss 21 a. At this time, as described above, first pressing block 3 is at least partially directed toward mounting member 21, and first pressing block 3 is also at least partially directed toward product a, more specifically, toward first connecting piece a 1. Thus, when the first mold 1 and the second mold 2 are clamped, the first presser 3 presses the first connecting piece a1, and the first connecting piece a1 and the mounting member 21 are brought into sufficient contact to form an electrical connection.

Wherein the mounting member 21 may be a metal block, such as a copper block. The main body of the mounting member 21 can be embedded in the second mold 2, and the first boss 21a thereof is ejected and extended out of the second mold 2 to expose the second mold 2, the exposed portion being contacted by the product. In other words, the second mold 2 may have a hole (not shown) for ejecting the first stud 21a, the first stud 21a protrudes from the hole to the outside of the second mold 2 to contact the product a, and the other part of the mounting member 21 is located in the second mold 2.

In this case, since the mounting member 21 exposes only the protruding portion of the first boss 21a to the second mold 2, the remaining portion is not in contact with the mounting member 21 but in contact with the second mold 2 except the first connecting piece a1 of the product a in contact with the mounting member 21. At this time, a limit contour groove (not shown) may be formed on the second mold 2 between the mounting member 21 and the product a, and the limit contour groove is adapted to the shape and volume of the product a, so that the product a can be positioned and mounted through the limit contour groove during mounting and is limited and fixed after mounting.

As shown in FIG. 7, in some embodiments, first compression block 3 includes a first end 31, a second end 33 opposite first end 31, and a middle portion 32 located between first end 31 and second end 33. Here, as described above, the first presser piece 3 is facing the first connecting piece a1, and more specifically, the first end 31 of the first presser piece 3 is facing the first connecting piece a 1. The middle portion 32 is elastically connected to the first mold 1 by an elastic member 34. The second end 33 is rotatably connected to the first mold 11. Thereby, the first pressing block 3 rotates relative to the first mold 1 through the second end 33, the first end 31 and the middle part 32 are driven to rotate synchronously, and in the process, the elastic piece 34 connected to the middle part 32 applies pressing force and flexibly adjusts the pressing force, so that the first end 31 presses the first connecting piece a1 on the mounting part 21 with adaptive force.

As shown in fig. 2 and 3, in some embodiments, a bracket 11 and a rotating shaft 12 may be further included, the bracket 11 is convexly disposed on a side surface of the first die 1 facing the second die 2, the rotating shaft 12 is disposed through the bracket 11 and the second end 33 of the first pressing block 3, so that the first pressing block 3 is pivotally connected to the first die 1, and further, the first end 31 and the middle portion 32 of the first pressing block 3 may rotate relative to the rotating shaft 12 to be spaced apart from the first die 1 or to be pressed against the product a.

In fig. 3, only the position where the rotating shaft 12 is inserted is shown by a dotted line, but a person skilled in the art can easily understand the connecting structure between the rotating shaft 12 and the bracket 11 and the first pressing block 3, and therefore redundant description is omitted here.

In an alternative implementation, as shown in fig. 7, the second end 33 of the first pressing block 3 may have a through hole 36 through which the rotating shaft 12 passes.

In an alternative embodiment, as shown in fig. 7, the middle portion 32 of the first pressing piece 3 may have an elastic piece groove 35 for the elastic piece 34 to partially extend into to limit and fix the elastic piece 34.

As shown in fig. 7, in some embodiments, first end 31 of first pressing block 3 extends from middle portion 32 toward second die 2. That is, the first end 31 is closer to the second mold 2 than the second end 33 and the middle portion 32. This allows the first end 31 to be closer to the mounting member 21 when the first mold 1 and the second mold 2 are clamped, thereby pressing the first connecting piece a1 more firmly against the mounting member 21.

As shown in fig. 2, in some embodiments, a probe module 4 may be further included, the probe module 4 is disposed on the first mold 1, the probe module 4 includes a testing head 41 facing the mounting member 21, and when a product a to be tested is mounted on the mounting member 21, the testing head 41 faces the product a. When the first mold 1 and the second mold 2 are closed, the test head 41 contacts the product a and reads the conduction parameter of the first connection sheet a1, so as to judge whether the conduction of the product a is qualified.

In addition, the probe module 4 may include other structures besides the test head 41, such as a mounting plate (not shown) for mounting to a mold, a protective cover (not shown), a connecting wire (not shown) for transmitting data measured by the test head 41, and the like, which belong to the prior art known to those skilled in the art, and therefore, the description of the embodiment is omitted here.

As shown in fig. 8-10, in some embodiments, a cover plate 5 may be further included, the cover plate 5 being disposed on the second mold 2 and located on one side of the mounting member 21. The cover 5 can be opened and closed above the mounting member 21, so that the product a can be mounted on the mounting member 21 in the open state, and the product a can be fixed on the mounting member 21 in the closed state.

As shown in fig. 8, in some embodiments, the cover plate 5 may include a third end 51 and a fourth end 52 opposite the third end 51. The third end 51 is rotatably connected to the second mold 2, and the fourth end 52 is rotatable relative to the second mold 2 to open and close above the mounting member 21.

The third end 51 is rotatably connected to the second mold 2 by referring to the connection between the second end 33 of the first pressing block 3 and the first mold 1, and those skilled in the art can understand that the two are similar connection structures, which is not described herein again.

As shown in fig. 9, the cover plate 5 is closed with respect to the second mold 2 (in this case, the mounting member 21 may already have the product a mounted thereon), and the third end 51 thereof is located right above the mounting member 21, so that the product a can be press-fitted onto the mounting member 21 for fixing.

After the test is completed, the third end 51 is rotated about a rotation shaft (not shown) on which the fourth end 52 is located away from the right above the mounting member 21, and forms a space with the mounting member 21 for the product a to enter.

As shown in fig. 10, the cover plate 5 is opened with respect to the second mold 2 with the third end 51 thereof being away from the mounting member 21, so that the product a can be mounted to the mounting member 21. It should be understood that the angle at which the cover 5 is opened may be any angle (0-180), and the opening of 180 shown in fig. 9 is merely illustrative as long as the product a can be mounted on the mounting member 21 after the cover 5 is opened.

As shown in fig. 8, the cover 5 may have a notch 53 at its fourth end 52 to avoid any raised structure on the product a when the cover is pressed onto the product a. The shape and size of the notch 53 can be adapted according to the appearance of the product a.

As shown in fig. 1, 2, 9-11, in some embodiments, a slide 22, a second press block 6, and a roller 23 may be further included. The slide block 22 is movably arranged in a groove 221 on the second die 2 and located on one side of the mounting part 21, the second pressing block 6 is convexly arranged on the slide block 22 and extends towards the mounting part 21, and the roller 23 is convexly arranged on one side, adjacent to the second pressing block 6, of the slide block 22. On a surface of the first mold 1 on a side facing the second mold 2, a bevel push block 13 having a protrusion and extending to a side of the roller 23, a trailing end of the bevel push block 13 (i.e., an end facing the roller 23) is formed as a bevel. During the process of moving the first mold 1 and the second mold 2 towards each other and clamping the molds, the inclined plane push block 13 gradually moves to the roller 23 and is in sliding fit with the roller 23, and the slide 22, more specifically, the slide 22 is driven to move towards the mounting piece 21 by the rolling between the inclined plane push block 13 and the roller 23 along with the increase of the clamping depth. Thereby driving the second pressing block 6 to move towards the mounting member 21 synchronously. In this case, as shown in fig. 4-6, the product a may further have a second connecting piece a2 thereon, and the second pressing piece 6 is moved toward the mounting member 21 until the second connecting piece a2 is pressed against the mounting member 21, thereby testing the conductivity of the second connecting piece a 2.

The state of the slide block 22, the second pressing block 6 and the roller 23 at the initial position can be referred to fig. 11, and the state of the slide block 22, the second pressing block 6 and the roller 23 after moving towards the mounting member 21 under the driving of the inclined pushing block 13 can be referred to fig. 9.

In an alternative implementation, a reset member (not shown), such as a spring, may be connected between the slide 22 and the second mold 2, so that when the first mold 1 and the second mold 2 are opened, the roller 23 is disengaged from the bevel push block 13, and the reset member may drive the slide 22 to move back to the initial position for resetting.

In an alternative implementation, the groove 221 may have a slide rail (not shown) therein, and the slide rail extends toward the mounting member 21. The slider 22 is disposed on the slide rail so as to move toward the mounting member 21 to press the second connecting piece a2, or, to move away from the mounting member 21 to be reset.

The arrangement of the reset piece and the slide rail is easily conceivable by those skilled in the art, and therefore, the detailed description is omitted here.

As shown in fig. 4-6 and 8, when a plurality of conductive connecting pieces, such as a third connecting piece A3 and a fourth connecting piece a4, are provided on the product a, a third pressing block 7 and a fourth pressing block 8 may be protruded on a side surface of the first die 1 facing the second die 2, and both the third pressing block 7 and the fourth pressing block 8 extend toward the mounting member 21. More specifically, when product a is placed on mount 21, third presser 7 extends towards third tab A3 of product a and is thus located on the side of third tab A3, and fourth presser 8 extends towards fourth tab a4 of product a and is thus located on the side of fourth tab a 4. Therefore, after the first die 1 and the second die 2 are closed, the third pressing block 7 presses the third connecting piece A3 on the mounting piece 21, and the fourth pressing block 8 presses the fourth connecting piece A4 on the mounting piece 21, so that the conductivity of the third connecting piece A3 and the fourth connecting piece A4 is tested.

When the product a has more conductive connecting pads (for example, also has a fifth connecting pad or more), the compression structure of the remaining conductive connecting pads may be the same as the second connecting pad a 2/the third connecting pad A3/the fourth connecting pad a4, and thus the description thereof is omitted.

As shown in fig. 1 and 2, in some embodiments, a guide post 91 and a guide hole 92 may be further included, and the guide post 91 may be disposed on the first mold 1 and the guide hole 92 may be disposed on the second mold 2, or the guide post 91 may be disposed on the second mold 1 and the guide hole 92 may be disposed on the first mold 1. The guide post 91 is provided to extend into the guide hole 92 at the time of mold clamping to guide the clamping of the first mold 1 and the second mold 2.

The number of the guide posts 91 and the guide holes 92 may be one or more, for example, in the present embodiment, the guide posts 91 have four, which are respectively located at four corners of the first mold 1, and the guide holes 92 also have four, which are respectively located at four corners of the second mold 2 in alignment with the guide posts 91.

The utility model discloses test fixture compresses tightly the first connection piece of product on the installed part through the first briquetting elasticity of elastic component drive, with the conductivity of testing first connection piece, promote roller and slider towards the installed part motion through the inclined plane ejector pad on the first mould, drive the second briquetting and compress tightly the second connection piece of product on the installed part, with the conductivity of testing the second connection piece, can also be through locating the third briquetting on the first mould, the fourth briquetting compresses tightly the third connection piece of product, the fourth connection piece is on the installed part, and go on simultaneously when first mould and second mould compound die above action, the efficiency of software testing is high, and the simple structure of briquetting part, low in production cost, the assembly degree of difficulty is low, long service life, and the packing force that the first briquetting of elastic component drive compressed tightly is elastic self-interacting, compress tightly effectually.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A test fixture for testing a product with a conductive connection sheet, comprising:

a first mold (1);

the second die (2) is positioned on one side of the first die (1), a mounting piece (21) for mounting the product is arranged on the second die (2), and the mounting piece (21) is made of a conductive material; and

the first pressing block (3) is arranged on the first die (1) and is elastically connected with the first die (1) through an elastic piece (34);

wherein the conductive connecting sheet comprises a first connecting sheet, and the first pressing block (3) is at least partially opposite to the first connecting sheet;

when the first mold (1) and the second mold (2) are not closed, the first pressing block (3) is pushed by the elastic piece (34) to be separated from the first mold (1) by a distance;

when the first die (1) and the second die (2) are closed, the elastic piece (34) is compressed and pushes the first pressing piece (3) to be at least partially pressed on the first connecting piece, so that the product is electrically connected with the mounting piece (21).

2. Test fixture according to claim 1, wherein the first press block (3) comprises a first end (31), a second end (33) opposite to the first end (31), and a middle portion (32) between the first end (31) and the second end (33);

the first end (31) is opposite to the first connecting piece;

the middle part (32) is elastically connected with the first die (1) through the elastic piece (34);

the second end (33) is rotatably connected to the first mold (1).

3. Test fixture according to claim 2, wherein the first end (31) extends from the middle portion (32) towards the second mould (2) in a bent manner.

4. The test fixture according to claim 2 or 3, further comprising a bracket (11) and a rotating shaft (12), wherein the bracket (11) is convexly disposed on a surface of the first mold (1) facing the second mold (2), and the rotating shaft (12) is disposed through the bracket (11) and the second end (33) of the first pressing block (3), so that the first pressing block (3) is pivotally connected to the first mold (1);

the middle part (32) and the first end (31) are rotated relative to the axis of rotation (12) in order to be spaced apart from the first mould (1) or pressed against the product.

5. The test fixture of claim 1, further comprising:

a probe module (4) provided to the first mold (1), the probe module (4) including a test head (41) facing the mounting member (21);

when the first mold (1) and the second mold (2) are closed, the test head (41) is contacted with the product and reads the conduction parameters of the first connecting sheet.

6. The test fixture of claim 1, further comprising:

the cover plate (5) is arranged on the second die (2) and located on one side of the mounting piece (21), and the cover plate (5) is used for fixing the product on the mounting piece (21).

7. Test fixture according to claim 6, wherein the cover plate (5) comprises a third end (51) and a fourth end (52) opposite to the third end (51);

the third end (51) is rotatably connected with the second die (2);

the fourth end (52) is arranged to rotate relative to the second mould (2) to open and close on the mounting member (21).

8. The test fixture of claim 1, further comprising:

the sliding block (22) is movably arranged in a groove (221) on one side of the mounting piece (21) on the second die (2);

the second pressing block (6) is convexly arranged on the sliding block (22) and extends towards the mounting piece (21);

a roller (23) which is provided in a protruding manner on the slider (22);

the first die (1) is provided with a slope push block (13) which protrudes and extends to one side of the roller (23), and when the first die (1) and the second die (2) move oppositely and are closed, the slope push block (13) drives the roller (23) to rotate and drives the sliding block (22) to move towards the mounting part (21);

the conductive connecting piece further comprises a second connecting piece, and the second pressing piece (6) and the sliding block (22) synchronously move towards the mounting piece (21), so that the second connecting piece is pressed on the mounting piece (21) after the first die (1) and the second die (2) are closed.

9. The test fixture of claim 1, further comprising:

a third pressing block (7) which is arranged on the first die (1) in a protruding mode and extends towards the mounting piece (21);

the fourth pressing block (8) is arranged on the first die (1) in a protruding mode and extends towards the mounting piece (21);

the conductive connecting piece further comprises a third connecting piece and a fourth connecting piece, after the first die (1) and the second die (2) are assembled, the third pressing block (7) presses the third connecting piece on the mounting piece (21), and the fourth pressing block (8) presses the fourth connecting piece on the mounting piece (21).

10. The test fixture of claim 1, further comprising:

a guide post (91) provided on the first mold (1) or the second mold (2);

a guide hole (92) provided in the second mold (2) or the first mold (1);

the guide post (91) is arranged to extend into the guide hole (92) to guide the clamping when clamping.

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