Lateral special-shaped cylinder piston locking device and testing jig applying same

Abstract

A lateral special-shaped cylinder piston locking device (300), having a base body (310) configured to be mounted on a fixing step (110) of a jig (100), wherein the base body (310) forms a module accommodating cavity (311) corresponding to a module body (120) of the jig (100); the base body (310) forms a lateral cylinder (312) on a side edge of the module accommodating cavity (311); an air inlet (313) and an air passage (314) are formed on the base body (310); a piston (320) and a pressing head bracket (330) are mounted in the lateral cylinder (312), an air chamber (315) is formed between the rear end of the piston (320) and the bottom of the lateral cylinder (312), and one end of the air passage (314) is connected to the air inlet (313) and the other end thereof communicates with the air chamber (315); and the pressing head bracket (330) is located at the front end of the piston (320), a return spring (331) is provided between the pressing head bracket (330) and the base body (310), a pressing head (340) is mounted on the pressing head bracket (330), and the front end of the pressing head (340) extends from the lateral cylinder (312) and is inserted into the module accommodating cavity (311). Further disclosed is a testing jig (100) applying the lateral special-shaped cylinder piston locking device (300). The lateral special-shaped cylinder piston locking device (300) is integrally designed, has a compact structure and a small overall volume, is integrally manufactured, and can make full use of the fixing step (110) of the jig (100), thereby facilitating manufacturing and assembly, and greatly reducing costs.

Description

A side-mounted irregular cylinder piston locking device and its application testing fixture Technical Field

[0001] This invention relates to a testing fixture, and more particularly to a lateral irregular cylinder piston locking device, and a testing fixture for its application. Background Technology

[0002] A connector is a device that connects two active devices to transmit current or signals. After connector assembly, it is necessary to check whether the terminals are installed, whether the installation position is accurate, and whether the terminals are deformed. Only when the terminals are correctly installed and without deformation can the normal use of the connector be guaranteed.

[0003] In the prior art, there are many fixtures used for testing the positioning of connector terminal assemblies. Regardless of the type of fixture used, the connector must first be positioned on the testing module. A commonly used positioning structure is shown in Figure 1. The fixture 100 has a fixed step 110, on which a module body 120 is mounted. A workpiece cavity 130 is formed on the module body 120. The fixture 100 also includes a direct-push cylinder 140 for positioning the workpiece and an unlocking button 150. A locking head 160 is mounted on the front end of the push rod of the direct-push cylinder 140. During testing, the workpiece 200 is placed in the workpiece cavity 130. The direct-push cylinder 140 is activated, causing the locking head 160 to extend into the workpiece cavity 130 and press against the workpiece 200, thus positioning the workpiece 200 within the cavity. After testing, the unlocking button 150 is activated, causing the direct-push cylinder 140 to reverse and drive the locking head 160, releasing the pressure on the workpiece 200. A careful analysis of the existing positioning structure reveals that the 140-stroke direct-push cylinder used for positioning has a large stroke, and the push rod drives the locking head 160 for positioning, resulting in a non-compact positioning structure with a large overall volume. Moreover, each time it requires special processing and assembly of each component, which is costly.

[0004] In view of this, the inventor, relying on his professional technical level and rich experience in the long-term research, design and manufacture of testing fixtures, as well as his familiarity with connector products, has developed a new type of testing fixture with a lateral irregular cylinder piston locking device, which leads to this invention. Summary of the Invention

[0005] The purpose of this invention is to provide a side-shaped cylinder piston locking device and a testing fixture for its application. The locking device is designed as an integrated unit with a compact structure and small overall size. It is manufactured as a single unit, which can make full use of the fixing steps of the fixture, making it convenient for processing and assembly, and greatly reducing costs.

[0006] To achieve the above objectives, the solution of the present invention is:

[0007] A lateral irregular cylinder piston locking device has a base body for mounting on a fixed step of a fixture; the base body forms a module receiving cavity corresponding to the module body of the fixture; a lateral cylinder is formed on the side of the module receiving cavity on the base body; an air inlet and an air passage are formed on the base body; a piston and a pressure head bracket are installed in the lateral cylinder, an air chamber is formed between the rear end of the piston and the bottom of the lateral cylinder, one end of the air passage is connected to the air inlet and the other end is connected to the bottom air chamber of the lateral cylinder; the pressure head bracket is located at the front end of the piston, a return spring is provided between the pressure head bracket and the base body, a pressure head is installed on the pressure head bracket, the front end of the pressure head extends out from the lateral cylinder and is inserted into the module receiving cavity, and the piston drives the pressure head bracket forward under the action of air pressure, so that the front end of the pressure head extends forward.

[0008] A support boss is formed at the bottom of the lateral cylinder, and a support groove is formed at the bottom of the piston. The piston is mounted in the lateral cylinder by means of the cooperation between the support boss and the support groove. Furthermore, the support boss is composed of several conical protrusions arranged in a ring at the bottom of the lateral cylinder, and the support groove is composed of several conical grooves arranged in a ring at the bottom skirt of the piston. The gaps between the several support grooves of the piston skirt form skirt support ribs, which connect the skirt and the piston center body.

[0009] The pressure head support has a sliding groove. The pressure head consists of a head and a buckle. A buckle deformation groove is formed on the buckle. The buckle of the pressure head passes through the sliding groove and is then set on the pressure head support by cooperating with the sliding groove through the buckle deformation groove.

[0010] The base body forms an unlock button slot and circuit board bracket fixing holes.

[0011] The base body has a longitudinally arranged air inlet and a transversely arranged air passage next to the lateral cylinder. The transverse air passage is connected to the air inlet. The air inlet opens downwards. The transverse air passage has a branch at the other end. One branch is connected to the air chamber, and the other branch is provided with a plug.

[0012] The base body is L-shaped, and the module accommodating cavity is located between the two sides of the L-shape, so that the base body combined with the module accommodating cavity is square; a lateral cylinder is formed on one side of the L-shape, and a fixing hole for fixing the module body is provided; an unlocking button slot and a circuit board bracket fixing hole are formed on the other side of the L-shape, and a fixing hole for auxiliary fixing of the module body is selectively provided.

[0013] The base body is frame-shaped, with the module housing cavity located within the frame. A lateral cylinder is fixed on one side of the frame; an unlocking button slot and a circuit board bracket fixing hole are formed on the other side of the frame. The frame interior has multiple fixing holes for fixing the module body, and the side has screw holes for fixing the lateral cylinder. Furthermore, a sub-base is disposed on one side of the frame of the base body, with the lateral cylinder formed on the sub-base, and an air inlet and air passage formed on the sub-base; a return spring is provided between the pressure head bracket and the sub-base.

[0014] A testing fixture includes a fixed step, a module body, and a lateral irregular cylinder piston locking device as described above. The base body of the lateral irregular cylinder piston locking device is mounted on the fixed step. The base body forms a module receiving cavity corresponding to the module body of the fixture. The module body is disposed within the module receiving cavity, and a communicating workpiece cavity and pressure head slot are formed on the module body. A lateral cylinder is formed on the side of the module receiving cavity on the base body. An air inlet and an air passage are formed on the base body. A piston and a pressure head support are installed in the lateral cylinder. An air chamber is formed between the rear end of the piston and the bottom of the lateral cylinder. One end of the air passage is connected to the air inlet, and the other end leads to the bottom air chamber of the lateral cylinder. The pressure head support is located at the front end of the piston. A return spring is provided between the pressure head support and the base body. A pressure head is installed on the pressure head support. The front end of the pressure head extends from the lateral cylinder and is inserted into the pressure head slot of the module body. Under the action of air pressure, the piston drives the pressure head support forward, causing the front end of the pressure head to extend forward into the workpiece cavity.

[0015] By adopting the above solution, the present invention makes full use of the fixed steps on the testing fixture originally used for module body assembly, and configures a locking device with a lateral irregular cylinder piston in the space of the fixed steps. The locking device is designed and processed into a standard part in an integrated manner, and the module body is assembled in the locking device, making the entire fixture structure more compact, which can greatly reduce the volume of the module body and the volume of the entire fixture, making it convenient for subsequent processing and assembly, and greatly reducing costs.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments are briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 is a schematic diagram of the existing detection device;

[0019] Figure 2 is a structural schematic diagram of Embodiment 1 of the present invention;

[0020] Figures 3 to 6 are top, rear, front and bottom views of the base body according to Embodiment 1 of the present invention;

[0021] Figures 7 to 9 are top, rear, and front views of the pressure head bracket according to Embodiment 1 of the present invention;

[0022] Figures 10 to 12 are top view, front view and rear view of the piston of Embodiment 1 of the present invention;

[0023] Figure 13 is a schematic diagram of the pressure head in Embodiment 1 of the present invention;

[0024] Figure 14 is a structural schematic diagram of Embodiment 2 of the present invention;

[0025] Figures 15 and 16 are top and rear views of the base body according to Embodiment 2 of the present invention;

[0026] Figure 17 is a structural schematic diagram of Embodiment 3 of the present invention;

[0027] Figure 18 is a left view of the auxiliary seat in Embodiment 3 of the present invention.

[0028] Label Explanation

[0029] Fixture 100, fixed step 110, module body 120, workpiece cavity 130, pressure head slot 131, direct push cylinder 140, unlocking button 150, locking head 160;

[0030] Workpiece 200;

[0031] Lateral irregular cylinder piston locking device 300, base body 310, module accommodating cavity 311, lateral cylinder 312, air inlet 313, air passage 314, air chamber 315, auxiliary seat 316, steel ball plug 317, support boss 318, screw hole 319, piston 320, support groove 321, skirt support rib 322, pressure head bracket 330, return spring 331, slide groove 332, pressure head 340, head 341, buckle 342, buckle deformation groove 343, unlocking button groove 350, circuit board bracket fixing hole 360, mounting hole 370, fixing hole 380, splicing concealing line 390. Embodiments of the present invention

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that the terms front, back, inside, outside, top, bottom, left, right, first, second, third, etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the technical features indicated, unless otherwise explicitly defined.

[0034] As shown in Figures 2 to 18, this invention discloses a lateral irregular cylinder piston locking device, and three embodiments are provided to illustrate the specific structure. The lateral irregular cylinder piston locking device 300 of this invention has a base body 310 for mounting on a fixture fixing step 110. The base body 310 forms a module receiving cavity 311 corresponding to the module body 120 of the fixture 100. A lateral cylinder 312 is formed on the side of the module receiving cavity 311 in the base body 310. An air inlet 313 and an air passage 314 are formed on the base body 310. A piston 320 and a pressure head support 330 are installed in the lateral cylinder 312. An air chamber 315 is formed between the rear end of the piston 320 and the bottom of the lateral cylinder 312, and one end of the air passage 314 is connected to the air inlet 313 while the other end leads to the bottom air chamber 315 of the lateral cylinder 312. The pressure head bracket 330 is located at the front end of the piston 320. A return spring 331 is provided between the pressure head bracket 330 and the base body 310. The pressure head 340 is installed on the pressure head bracket 330. The front end of the pressure head 340 extends from the side cylinder 312 and is inserted into the module receiving cavity 311.

[0035] During testing, the gas supplied by the air pump enters through the air inlet 313, passes through the air passage 314, and reaches the air chamber 315. The air pressure acts on the rear of the piston 320, pushing the piston 320 to compress the return spring 331, storing energy and moving it forward. The pressure head support 330 drives the front end of the pressure head 340 forward into the workpiece cavity 130 of the module body 120, positioning the workpiece 200. After testing, pressing the unlock button 150 causes the air pump to draw air, causing the piston 320 to lose its thrust. Under the action of the return spring 331, the pressure head support 330 and the piston 320 move backward to reset, causing the front end of the pressure head 340 to exit the workpiece cavity 130, unlocking the workpiece 200.

[0036] In this way, the present invention makes full use of the fixed step 110 on the testing fixture 100, which was originally used for assembling the module body 120. The lateral irregular cylinder piston locking device 300 of the present invention is arranged in the space of the fixed step 110, and then the module body 120 is assembled in the lateral irregular cylinder piston locking device 300, making the structure of the entire fixture 100 more compact, which can greatly reduce the volume of the module body 120, and the volume of the entire fixture 100 is also reduced accordingly. Furthermore, the lateral irregular cylinder piston locking device 300 of the present invention adopts an integrated design and is processed into a standard part, further reducing the size of the module body 120, facilitating subsequent processing and assembly, and greatly reducing costs.

[0037] Meanwhile, this invention discloses a testing fixture 100, comprising a fixed step 110, a module body 120, and a lateral irregular cylinder piston locking device 300 as described above. The base body 310 of the lateral irregular cylinder piston locking device 300 is mounted on the fixed step 110 via a mounting member and mounting hole 370, making full use of the fixed step 110 of the testing fixture 100. The base body 310 forms a module receiving cavity 311 corresponding to the module body 120 of the fixture 100. The module body 120 is disposed in the module receiving cavity 311 via a fixing member and fixing hole 380. A communicating workpiece cavity 130 and a pressure head slot 131 are formed on the module body 120. A lateral cylinder 312 is formed on the side of the module receiving cavity 311 by the base body 310. An air inlet 313 and an air passage 314 are formed on the base body 310. The air inlet 313 avoids the fixed step 110. A piston 320 and a pressure head bracket 330 are installed in the side cylinder 312. An air chamber 315 is formed between the rear end of the piston 320 and the bottom of the side cylinder 312. One end of the air passage 314 is connected to the air inlet 313, and the other end leads to the bottom air chamber 315 of the side cylinder 312. The pressure head bracket 330 is located at the front end of the piston 320. A return spring 331 is provided between the pressure head bracket 330 and the base body 310. A pressure head 340 is installed on the pressure head bracket 330. The front end of the pressure head 340 extends from the side cylinder 312 and is inserted into the pressure head slot 131 of the module body 120. As mentioned above, under the action of air pressure, the piston 320 drives the pressure head support 330 to move forward, so that the front end of the pressure head 340 passes through the pressure head slot 131 and extends into the workpiece cavity 130 to position the workpiece 200.

[0038] Furthermore, a support boss 318 is formed at the bottom of the lateral cylinder 312, and a support groove 321 is formed at the bottom of the piston 320. The piston 320 is mounted in the lateral cylinder 312 by means of the cooperation between the support boss 318 and the support groove 321. To ensure smooth movement and accurate repositioning of the piston 320 after assembly, the support boss 318 is composed of several conical protrusions arranged in a ring at the bottom of the lateral cylinder 312. Correspondingly, the support groove 321 is composed of several conical grooves arranged in a ring at the bottom skirt (periphery) of the piston 320. Through the cooperation between the conical protrusions and the conical grooves, the piston 320 is accurately positioned during repositioning, and the piston 320 skirt is supported. The piston 320 skirt can be tightly attached to the cylinder wall of the lateral cylinder 312 in the initial position. The effective sealing function effectively prevents deformation of the skirt of the non-circular piston 320. During operation, the conical protrusion and conical groove play a guiding role, making the movement smooth. Moreover, the gap between the several support grooves 321 of the piston 320 skirt forms the skirt support ribs 322. The skirt support ribs 322 connect the skirt and the piston center body, which can maintain the shape of the piston 320 skirt, prevent the skirt from collapsing inward (supporting the skirt to not collapse inward), and maintain elasticity, further promoting the skirt to keep tightly sealed to the cylinder wall.

[0039] Furthermore, in this invention, a sliding groove 332 is formed on the pressure head bracket 330. The pressure head 340 consists of a head 341 and a latch 342. A latch deformation groove 343 is formed on the latch 342, which gives the latch 342 the elastic deformation function to shrink and expand. After the latch 342 of the pressure head 340 passes through the sliding groove 332, it cooperates with the sliding groove 332 with the help of the latch deformation groove 343, allowing the pressure head 340 to move within the sliding groove 332. According to the appropriate position that the workpiece 200 needs to be locked, the pressure head 340 is slid to the required position and then positioned on the pressure head bracket 330. In this way, the pressure head 340 is elastically fixed in the sliding groove 332 without the need for screw fixation, making assembly and positioning very convenient.

[0040] As shown in Figures 2 to 13, the base body 310 of Embodiment 1 of the present invention is L-shaped, and the module accommodating cavity 311 is located between the two sides of the L-shape, so that the base body 310 combined with the module accommodating cavity 311 is rectangular in plan view; a lateral cylinder 312 is formed on one side of the L-shape, and a fixing hole 380 for fixing the module body 120 is provided; a longitudinally arranged air inlet 313 and a transversely arranged air passage 314 are formed next to the lateral cylinder 312. The transverse air passage 314 is connected to the air inlet 313. The air inlet 313 avoids the fixing step 110, and the opening of the air inlet 313 faces downward. In order to facilitate processing and forming, the transversely arranged air passage 314... At the other end, there is a fork, one fork is connected to the air chamber 315, and the other fork (i.e. the demolding through hole) is provided with a steel ball plug 317; an unlocking button groove 350 (for installing the unlocking button 150) and a circuit board bracket fixing hole 360 ​​(for installing the circuit board bracket) are formed on the other side of the L-shape. A splicing masking line 390 is also provided between the module body 120 and the module receiving cavity 311; the piston 320 is elongated, and the corresponding pressure head bracket 330 is also elongated. Three pressure heads 340 are installed on the pressure head bracket 330. The workpiece cavity 130 on the module body 120 is also elongated. This embodiment is suitable for detecting elongated workpieces 200.

[0041] As shown in Figures 14 to 16, the base body 310 of Embodiment 2 of the present invention is also L-shaped. The difference between Embodiment 2 and Embodiment 1 is that the shapes and sizes are different. The two sides of the L-shape in Embodiment 1 have different lengths, while the two sides of the L-shape in Embodiment 2 have equal lengths. The module accommodating cavity 311 of Embodiment 2 is located between the two sides of the L-shape, so that the base body 310 combined with the module accommodating cavity 311 is square. This structure is similar to that of Embodiment 1. A lateral cylinder 312 is formed on one side of the L-shape, and a fixing hole 380 for fixing the module body 120 is provided. A longitudinally arranged air inlet 313 and a transversely arranged air passage 314 are formed next to the lateral cylinder 312. The transverse air passage 314 is connected to the air inlet 313. The air inlet 313 avoids the fixing step 110. The opening of the air inlet 313 is... The downward-facing, horizontally arranged air passage 314 has a fork at the other end. One fork communicates with the air chamber 315, and the other fork (i.e., the demolding through hole) is provided with a steel ball plug 317. The intersection of the two sides of the L-shape forms an unlocking button groove 350 and a circuit board bracket fixing hole 360. The base body 310 also has a mounting hole 370 for installing a locking device, and a fixing hole 380 for auxiliary fixing of the module body 120 as needed. A splicing concealing line 390 is also provided between the module body 120 and the module receiving cavity 311. The piston 320 is square, and the corresponding pressure head bracket 330 is also square. A pressure head 340 is installed on the pressure head bracket 330. The workpiece cavity 130 on the module body 120 is also square. This embodiment is suitable for detecting square workpieces 200.

[0042] As shown in Figures 17 and 18, the base body 310 of Embodiment 3 of the present invention is frame-shaped, with the module accommodating cavity 311 located within the frame. The frame contains multiple fixing holes 380 for fixing the module body 120. A lateral cylinder 312 is fixed on one side of the frame. Specifically, in this embodiment, an independent sub-base 316 is configured on one side of the frame of the base body 310. The lateral cylinder 312 is formed on the sub-base 316, and screws and screw holes 319 are used to fix the sub-base 316 (lateral cylinder 312). A return spring 331 is provided between the pressure head bracket 330 and the sub-base 316. A longitudinal arrangement is formed on the sub-base 316. The air inlet 313 and the transversely arranged air passage 314 are connected to the air inlet 313. The air inlet 313 avoids the fixed step 110 and the opening of the air inlet 313 faces downward. The transversely arranged air passage 314 has a fork at the other end. One fork is connected to the air chamber 315, and the other fork (i.e. the demolding through hole) is provided with a steel ball plug 317. An unlocking button groove 350 and a circuit board bracket fixing hole 360 ​​are formed on the other side of the frame. The piston 320 is elongated, and the corresponding pressure head bracket 330 is also elongated. Two pressure heads 340 are installed on the pressure head bracket 330. This embodiment is suitable for detecting square or elongated workpieces 200.

[0043] The embodiments described above are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, they do not limit the patent scope of the present invention. All equivalent changes or modifications made in accordance with the spirit disclosed in the present invention should still be covered within the patent scope of the present invention.

Claims

1. A lateral irregular-shaped cylinder piston locking device, characterized in that: It has a base body for mounting on a fixed step of a fixture; the base body forms a module receiving cavity corresponding to the module body of the fixture; a lateral cylinder is formed on the side of the module receiving cavity on the base body; an air inlet and an air passage are formed on the base body; a piston and a pressure head bracket are installed in the lateral cylinder, an air chamber is formed between the rear end of the piston and the bottom of the lateral cylinder, one end of the air passage is connected to the air inlet and the other end is connected to the bottom air chamber of the lateral cylinder; the pressure head bracket is located at the front end of the piston, a return spring is provided between the pressure head bracket and the base body, a pressure head is installed on the pressure head bracket, the front end of the pressure head extends from the lateral cylinder and is inserted into the module receiving cavity, and the piston drives the pressure head bracket forward under the action of air pressure, so that the front end of the pressure head extends forward.

2. The lateral irregular cylinder piston locking device according to claim 1, characterized in that: The bottom of the lateral cylinder forms a support boss, and the bottom of the piston forms a support groove. The piston is mounted in the lateral cylinder by means of the cooperation between the support boss and the support groove.

3. The lateral irregular cylinder piston locking device according to claim 2, characterized in that: The support boss is composed of several conical protrusions arranged in a ring at the bottom of the side cylinder. The support groove is composed of several conical grooves arranged in a ring at the bottom skirt of the piston. The gap between the several support grooves of the piston skirt forms the skirt support ribs, which connect the skirt and the piston center body.

4. The lateral irregular cylinder piston locking device according to claim 1, characterized in that: The pressure head support has a sliding groove. The pressure head consists of a head and a buckle. A buckle deformation groove is formed on the buckle. The buckle of the pressure head passes through the sliding groove and is then set on the pressure head support by cooperating with the sliding groove through the buckle deformation groove.

5. A lateral irregular-shaped cylinder piston locking device according to claim 1, characterized in that: The base body forms an unlock button slot and circuit board bracket fixing holes.

6. The lateral irregular cylinder piston locking device according to claim 1, characterized in that: The base body has a longitudinally arranged air inlet and a transversely arranged air passage next to the lateral cylinder. The transverse air passage is connected to the air inlet. The air inlet opens downwards. The transverse air passage has a branch at the other end. One branch is connected to the air chamber, and the other branch is provided with a plug.

7. A lateral irregular-shaped cylinder piston locking device according to claim 1, characterized in that: The base body is L-shaped, and the module accommodating cavity is located between the two sides of the L-shape, so that the base body combined with the module accommodating cavity is square; a lateral cylinder is formed on one side of the L-shape, and a fixing hole for fixing the module body is provided; an unlocking button slot and a circuit board bracket fixing hole are formed on the other side of the L-shape, and a fixing hole for auxiliary fixing of the module body is selectively provided.

8. A lateral irregular-shaped cylinder piston locking device according to claim 1, characterized in that: The base body is frame-shaped, and the module accommodating cavity is located in the frame. A lateral cylinder is fixed on one side of the frame. An unlocking button slot and a circuit board bracket fixing hole are formed on the other side of the frame. The frame has multiple fixing holes for fixing the module body inside, and screw holes for fixing the lateral cylinder on the side.

9. A lateral irregular-shaped cylinder piston locking device according to claim 8, characterized in that: A sub-seat is arranged on one side of the frame of the base body, a lateral cylinder is formed on the sub-seat, and an air inlet and air passage are formed on the sub-seat; a return spring is provided between the pressure head bracket and the sub-seat.

10. A testing fixture, characterized in that: The device comprises a fixed step, a module body, and a lateral irregular cylinder piston locking device according to any one of claims 1 to 9; the base body of the lateral irregular cylinder piston locking device is mounted on the fixed step; the base body forms a module receiving cavity corresponding to the module body of the fixture, the module body is disposed in the module receiving cavity, and a communicating workpiece cavity and a pressure head slot are formed on the module body; a lateral cylinder is formed on the side of the module receiving cavity on the base body; an air inlet and an air passage are formed on the base body; a piston and a pressure head bracket are installed in the lateral cylinder, an air chamber is formed between the rear end of the piston and the bottom of the lateral cylinder, one end of the air passage is connected to the air inlet and the other end is connected to the bottom air chamber of the lateral cylinder; the pressure head bracket is located at the front end of the piston, a return spring is provided between the pressure head bracket and the base body, a pressure head is installed on the pressure head bracket, the front end of the pressure head extends out from the lateral cylinder and is inserted into the pressure head slot of the module body, and the piston drives the pressure head bracket forward under the action of air pressure, so that the front end of the pressure head extends forward into the workpiece cavity.

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