Tray tool convenient for quickly fixing PCB (Printed Circuit Board) and operation method thereof

Abstract

The invention discloses a tray tool convenient for quickly fixing a PCB (Printed Circuit Board) and an operation method of the tray tool. The tray tool comprises a tool tray, a to-be-tested object placing box arranged at the top of the tool tray, a side pushing block quick clamp arranged on one side of the top of the tool tray, and a forward pushing quick clamp arranged on one side, away from the side pushing block quick clamp, of one end of the top of the tool tray. And the cam sliding plate is arranged on the surface of the to-be-detected object placing box. According to the tray tool, the gland clamping hooks are matched and fixed with the upper gland and the lower gland, then the top plate is automatically bounced, one-key type rapid fixing of an object to be detected can be achieved, an operator only needs to place a PCB and trigger the clamping mechanism, reliable clamping can be completed, the feeding and discharging time is greatly shortened, and the working efficiency is improved. The production and testing efficiency is remarkably improved, the overall structure is compact, all parts are reasonable in layout and smooth in movement, space is saved, and operation portability and stability are guaranteed.

Description

Technical Field

[0001] This invention relates to a pallet fixture, and more particularly to a pallet fixture for quickly securing PCB boards and its operating method. Background Technology

[0002] PCB, or Printed Circuit Board, is an important electronic component. It serves as the support for electronic components and the carrier for their electrical interconnections. Because it is manufactured using electronic printing techniques, it is called a "printed" circuit board. Almost every electronic device, from small items like watches and calculators to large systems like computers, communication devices, and military weapons, uses PCBs to enable electrical interconnection between integrated circuits and other electronic components. A PCB consists of an insulating base, connecting wires, and pads for mounting and soldering electronic components. It serves the dual purpose of conductive lines and an insulating base, and can replace... Printed circuit boards (PCBs) replace complex wiring to achieve electrical connections between various components in a circuit. This not only simplifies the assembly and soldering of electronic products and reduces the amount of wiring work in traditional methods, greatly reducing the labor intensity of workers, but also reduces the overall size of the device, lowers product costs, and improves the quality and reliability of electronic equipment. PCBs offer excellent product consistency, allowing for standardized design, which facilitates mechanization and automation in the production process. Furthermore, a fully assembled and debugged PCB can serve as an independent spare part, facilitating interchangeability and maintenance of the entire product. Currently, PCBs are widely used in the manufacturing of electronic products.

[0003] Currently, common PCB board fixing methods mostly use general-purpose clamps with bolts for locking, multiple independent pressure plates or clamps for local fixation, or rely on positioning pins and manual alignment. This means that each PCB board needs to be manually aligned, placed, and clamped one by one through multiple steps, which takes a long time to load and unload. It is difficult to meet the needs of batch and high-efficiency production testing. In addition, it relies on the experience of operators and is prone to problems such as uneven clamping force, positioning deviation, or insecure locking, which may lead to poor contact of test probes, unstable signal transmission, or even damage to the PCB board. Summary of the Invention

[0004] Given that the existing tooling requires multiple steps of manual alignment, placement, and individual clamping when operating on PCB boards, the loading and unloading process is time-consuming and difficult to adapt to the needs of batch, high-efficiency production testing. Furthermore, it relies on the operator's experience and is prone to problems such as uneven clamping force, positioning deviation, or insecure locking, which may lead to poor contact of test probes, unstable signal transmission, or even damage to the PCB board, this invention is proposed.

[0005] Therefore, the main objective of this invention is to provide a tray fixture and its operation method for quickly fixing PCB boards, so as to overcome the shortcomings of the prior art.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution.

[0007] One aspect of the present invention provides a tray fixture for facilitating rapid fixation of a PCB board, comprising a fixture tray, a test object placement box disposed on the top of the fixture tray, a side-push quick clamp disposed on one side of the top of the fixture tray, a front-push quick clamp disposed on one end of the top of the fixture tray away from the side-push quick clamp, a cam sliding plate disposed on the surface of the test object placement box, a probe mounting module disposed on the front-push quick clamp, a test object disposed on the top of the test object placement box, a lower pressure cover disposed above the test object placement box, an upper pressure cover disposed above the lower pressure cover, a mounting plate disposed on the top of the fixture tray away from the front-push quick clamp, an electrical signal conversion module disposed above the mounting plate, a lifting component disposed above the test object placement box, and a quick-release component disposed below the mounting plate.

[0008] In one embodiment, a mounting base is fixedly installed at one end of the test object placement box, a rotating shaft is provided on the top of the mounting base, a pressing block is provided above the mounting base, and the bottom end of the pressing block and the top end of the upper pressure cover are connected to each other.

[0009] In one embodiment, connecting blocks are fixedly installed on both sides of one end of the bottom of the pressing block, and a connecting hole is provided on one side of the connecting block. The connecting hole passes through the connecting block, and the rotating shaft slides through the two sets of connecting blocks through the connecting hole.

[0010] In one embodiment, a foolproof mounting block is installed at one end of the top two sides of the test object placement box. The foolproof mounting block is L-shaped, and support columns are provided on both sides of the top of the test object placement box away from the foolproof mounting block.

[0011] In one embodiment, the lower pressure cover has a first limiting groove at the end away from the pressing top block, the upper pressure cover has a second limiting groove at the end away from the pressing top block, and the top of the test object placement box is rotatably connected to a pressure cover hook at the end away from the mounting base, with a limiting horizontal block provided at the end of the pressure cover hook near the test object.

[0012] In one embodiment, the lifting assembly includes first slide rails on both sides of the top of the test object placement box near the end of the pressure cover hook, two sets of first sliders disposed inside the first slide rails, a top plate disposed above the first slide rails, connecting plates disposed on both sides of the bottom of the top plate, and a first spring disposed on one side of the two sets of connecting plates that are close to each other. The end of the connecting plate away from the top plate is hinged to the top of the first slider. In one embodiment, the quick-release assembly includes insertion holes on both sides of the top of the mounting plate, the insertion holes penetrating the mounting plate, and positioning blocks on both sides of the bottom of the electrical signal conversion module, the positioning blocks penetrating the mounting plate through the insertion holes, and a positioning hole on one bottom side of the positioning block penetrating the positioning block.

[0013] In one embodiment, the mounting plate has second slide rails on both sides of its bottom, a second slider is provided on the inner side of the second slide rail, and a limit rod is provided on one side of the second slider. One end of the limit rod passes through the positioning block through a positioning hole.

[0014] In one embodiment, mounting side plates are fixedly installed at both ends of the bottom of the mounting plate. The mounting side plates are located between two sets of second sliders. Limiting rods are provided at one end of the two sets of mounting side plates that are close to each other. A movable sleeve block is provided on the surface of the limiting rod. A second spring is provided at one end of the surface of the limiting rod. Connecting rods are provided on both sides of the movable sleeve block. One end of the connecting rod is hinged to one side of the second slider. A pull rod is provided at the bottom of the movable sleeve block. One end of the pull rod slides through one set of mounting side plates. A pull handle is provided at the end of the pull rod away from the movable sleeve block.

[0015] Another aspect of the present invention provides a method for operating a tray fixture for quickly securing a PCB board, comprising the following steps: When it is necessary to remove and replace the test object placed on the test box, first flip the cover hook so that the cover hook and the limiting block move out from the second limiting groove on the upper cover and the first limiting groove on the lower cover. Then, through the rebound force of the first spring, the angle between the two sets of connecting plates at the bottom of the top plate and the top plate decreases, causing the two sets of first sliders to move closer to each other within the first slide rail, and then causing the top plate to rise. When the top plate rises, the lower cover can be automatically pushed open. At this point, simply rotate the lower and upper covers according to the axis of rotation to fully expose the test object on the test object placement box, making it convenient to take out and replace the test object. After replacing the test item in the test item placement box, first press the lower and upper pressure caps back onto the top of the test item placement box, and then reset the pressure cap hooks.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: (1) This invention achieves one-click quick fixation of the test object by using the mutual adaptation and fixation of the pressure cover hook and the upper and lower pressure covers, and then using the automatic pop-up setting of the top plate. The operator only needs to place the PCB board and trigger the clamping mechanism to complete the reliable clamping, which greatly shortens the loading and unloading time and significantly improves the production and testing efficiency. The overall structure is exquisite and compact, the layout of each component is reasonable, and the movement is smooth. It saves space and ensures the ease and stability of operation. At the same time, the upper and lower pressure covers are closed with the pressure cover hook, combined with the synergistic effect of the multi-directional quick clamp, which can apply uniform and controllable clamping force to the test object, avoiding excessive local stress that may cause deformation of the test object or damage to the components. In addition, the mechanical clamping method is more consistent than manual screw fixing, which is conducive to ensuring the stability of electrical connection during the test.

[0017] (2) The tooling of the present invention integrates an electrical signal conversion module, and the electrical signal conversion module adopts a pluggable design, which enables quick connection and separation between the tooling body and the tooling body. When the electrical signal conversion module is damaged due to frequent use or needs to be adapted to different test interfaces, it can be directly disassembled and replaced without replacing the entire tooling or performing complex wiring operations. This significantly reduces maintenance costs, reduces equipment downtime, and improves the applicability and life cycle of the tooling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a tray fixture for quickly fixing a PCB board in one embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of a tray fixture for quickly fixing a PCB board, taken from another perspective, according to one embodiment of the present invention. Figure 3 This is a three-dimensional structural diagram of a test object placement box according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the unfolded three-dimensional structure of a test object placement box according to one embodiment of the present invention; Figure 5 for Figure 4 A magnified structural diagram at point A; Figure 6 This is a three-dimensional structural diagram of a mounting plate and an electrical signal conversion module according to one embodiment of the present invention; Figure 7 This is a bottom-view perspective view of a mounting plate in one embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Tooling tray; 2. Side-push block quick clamp; 3. Cam sliding plate; 4. Front-push quick clamp; 5. Probe mounting module; 6. Cover hook; 7. Test object; 8. Upper cover; 9. Test object placement box; 10. Electrical signal conversion module; 11. Mounting plate; 12. Lifting assembly; 121. First slide rail; 122. First slider; 123. Connecting plate; 124. Top plate; 125. First spring; 13. Quick-release assembly; 131. Insertion hole; 132. Positioning block; 133. Positioning hole; 134. Second slide rail; 135. Second slider; 136. Mounting side plate; 137. Limiting rod; 138. Limiting rod; 139. Second spring; 1310. Moving sleeve; 1311. Pull rod; 1312. Linkage rod; 1313. Pull handle; 14. Anti-foolproof mounting block; 15. Support column; 16. Limiting horizontal block; 17. Lower pressure cover; 18. Pressing top block; 19. Connecting block; 20. Connecting hole; 21. First limiting slot; 22. Second limiting slot; 23. Rotating shaft; 24. Mounting base. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Example 1 Reference Figures 1-5 This is the first embodiment of the present invention, which provides a tray fixture for quick and easy fixing of PCB boards. The tray fixture includes a fixture tray 1, a test object placement box 9 disposed on the top of the fixture tray 1, a side push block quick clamp 2 disposed on one side of the top of the fixture tray 1, a front push quick clamp 4 disposed on one side of the top of the fixture tray 1 away from the side push block quick clamp 2, a cam sliding plate 3 disposed on the surface of the test object placement box 9, which can drive the cam sliding plate 3 through the side push block quick clamp 2 to limit the upward operation of the internal structure of the test object placement box 9, a probe mounting module 5 disposed on the front push quick clamp 4, a test object 7 disposed on the top of the test object placement box 9, a lower pressure cover 17 disposed above the test object placement box 9, an upper pressure cover 8 disposed above the lower pressure cover 17, a mounting plate 11 disposed on the top of the fixture tray 1 away from the front push quick clamp 4, and an electrical signal conversion module 10 disposed above the mounting plate 11. The electrical signal conversion module 10 can be used to connect to the outside to complete the test operation via a cable. The lifting assembly 12 is located above the test object placement box 9, and the quick-release assembly 13 is located below the mounting plate 11.

[0022] One end of the test object placement box 9 is fixedly installed with a mounting base 24, a rotating shaft 23 is rotatably connected to the top of the mounting base 24, and a pressing block 18 is set above the mounting base 24, with the bottom end of the pressing block 18 and the top end of the upper pressure cover 8 connected to each other.

[0023] Connecting blocks 19 are fixedly installed on both sides of one end of the bottom of the pressing top block 18. A connecting hole 20 is opened on one side of the connecting block 19 and passes through the connecting block 19. The rotating shaft 23 slides through the two sets of connecting blocks 19 through the connecting hole 20. The pressing top block 18 and the connecting block 19 are installed vertically to restrict the top of the upper cover 8, and then the lower cover 17 and the upper cover 8 are fixed.

[0024] Anti-mistake mounting blocks 14 are installed at one end of the top two sides of the test object placement box 9. The anti-mistake mounting blocks 14 are L-shaped and are set on the support columns 15 on both sides of the top of the test object placement box 9 away from the anti-mistake mounting blocks 14. The anti-mistake mounting blocks 14 and support columns 15 can make the lower pressure cover 17 and the upper pressure cover 8 above the test object 7, avoiding hard contact between the lower pressure cover 17 and the test object 7 and causing damage.

[0025] The lower pressure cover 17 has a first limiting groove 21 at the end away from the pressing top block 18, and the upper pressure cover 8 has a second limiting groove 22 at the end away from the pressing top block 18. The top of the test object placement box 9 is rotatably connected to the pressure cover hook 6 at the end away from the mounting base 24, and a limiting horizontal block 16 is set at the end of the pressure cover hook 6 near the test object 7. The lower pressure cover 17 and the upper pressure cover 8 can be fixed by the pressure cover hook 6 and the limiting horizontal block 16, thereby ensuring that the test object 7 is fixed.

[0026] The lifting assembly 12 includes a first slide rail 121 on both sides of the top of the object placement box 9 near the end of the cover hook 6, two sets of first sliders 122 slidably connected to the inner side of the first slide rail 121, a top plate 124 disposed above the first slide rail 121, connecting plates 123 hinged to the bottom sides of the top plate 124, with the end of the connecting plate 123 away from the top plate 124 and the top of the first sliders 122 hinged to each other, and a first spring 125 connected to the side of the two sets of connecting plates 123 that are close to each other. When the cover 17 is installed on the object placement box 9, the top plate 124 is in a pressed state, which causes the two sets of connecting plates 123 to push the two sets of first sliders 122 to move away from each other inside the first slide rail 121, thereby stretching the first spring 125.

[0027] During use, when it is necessary to remove and replace the test object 7 on the test object placement box 9, firstly, the connecting block 19 is rotated and sleeved on the surface of the rotating shaft 23 on the mounting base 24, thereby synchronously connecting the pressing top block 18 and the upper pressure cover 8. Then, the pressure cover hook 6 is flipped, causing the pressure cover hook 6 and the limiting horizontal block 16 to move out of the second limiting slot 22 on the upper pressure cover 8 and the first limiting slot 21 on the lower pressure cover 17. Subsequently, the rebound force of the first spring 125 causes the angle between the two sets of connecting plates 123 at the bottom of the top plate 124 and the top plate 124 to decrease, so that the two sets of connecting plates 123 at the bottom of the top plate 124 and the angle between the top plate 124 decrease. A slider 122 moves closer to each other within the first slide rail 121, causing the top plate 124 to rise. When the top plate 124 rises, it automatically pushes open the lower pressure cover 17. At this time, simply rotate the lower pressure cover 17 and the upper pressure cover 8 with the rotation shaft 23 at the axis, so that the test object 7 on the test object placement box 9 is fully exposed, making it convenient to take out and replace the test object 7. After the test object 7 on the test object placement box 9 is replaced, first press the lower pressure cover 17 and the upper pressure cover 8 back onto the top of the test object placement box 9, and then reset the pressure cover hook 6.

[0028] Example 2 Reference Figures 1-7 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the quick-release assembly 13 includes insertion holes 131 on both sides of the top of the mounting plate 11, and the insertion holes 131 penetrate the mounting plate 11; positioning blocks 132 are installed on both sides of the bottom of the electrical signal conversion module 10, and the positioning blocks 132 penetrate the mounting plate 11 through the insertion holes 131; and positioning holes 133 are opened on the bottom of one side of the positioning blocks 132, and the positioning holes 133 penetrate the positioning blocks 132.

[0029] The mounting plate 11 has two sides of the bottom of the second slide rail 134 and a second slider 135 slidably connected to the inner side of the second slide rail 134. The second slide rail 134 and the second slider 135 are used to facilitate the limiting operation of the limiting rod 137. The limiting rod 137 is installed on one side of the second slider 135, and one end of the limiting rod 137 passes through the positioning hole 133 and penetrates the positioning block 132.

[0030] Mounting side plates 136 are fixedly mounted at both ends of the bottom of the mounting plate 11, and the mounting side plates 136 are located between two sets of second sliders 135. A limiting rod 138 is positioned at one end of each set of mounting side plates 136, and a movable sleeve 1310 is slidably sleeved on the surface of the limiting rod 138. A second spring 139 is sleeved on one end of the surface of the limiting rod 138, with one end of the second spring 139 connected to one end of one set of mounting side plates 136, and one end of the second spring 139 connected to one end of the movable sleeve 1310. The ends are connected to each other, and the connecting rods 1312 are set on both sides of the movable sleeve block 1310. One end of the connecting rod 1312 is hinged to one side of the second slider 135. The pull rod 1311 is fixedly installed at the bottom of the movable sleeve block 1310. One end of the pull rod 1311 slides through a set of mounting side plates 136. The pull handle 1313 is set at the end of the pull rod 1311 away from the movable sleeve block 1310. The pull handle 1313 is used to facilitate the pulling operation of the pull rod 1311.

[0031] During use, when it is necessary to disassemble and replace the electrical signal conversion module 10 on the mounting plate 11, the pull handle 1313 is pulled to move the pull rod 1311, causing the moving sleeve 1310 to slide on the surface of the limiting rod 138, thus stretching the second spring 139. The movement of the moving sleeve 1310 then causes the connecting rods 1312 on both sides to pull the second slider 135 closer to the limiting rod 138 inside the second slide rail 134. This causes the limiting insert 137 on one side of the second slider 135 to move out of the positioning hole 133 on the positioning insert 132, thus canceling the positioning... After fixing the plug 132, the electrical signal converter module 10 can be quickly removed and replaced from the mounting plate 11. When replacing the electrical signal converter module 10, simply reinsert the positioning plug 132 into the socket 131 on the electrical signal converter module 10, then release the pull handle 1313. The rebound force of the second spring 139 will drive the moving sleeve 1310 to reset, thereby allowing the limiting plug 137 to pass through the positioning hole 133 and penetrate the positioning plug 132 again, thus completing the restriction of the positioning plug 132 and realizing the fixing operation of the mounting plate 11 on the electrical signal converter module 10.

[0032] The remaining structure is the same as that in Example 1.

[0033] The pallet fixture provided in the above embodiments of the present invention has a compact and stable structure, is easy to operate, can significantly shorten loading and unloading time, and significantly improve production and testing efficiency.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A tray fixture for quick and easy fixing of PCB boards, comprising a fixture tray (1), characterized in that, Also includes: Test object placement box (9) is set on top of the tooling tray (1). Side push block clamp (2) is set on one side of the top of the tooling tray (1). The front-push quick clamp (4) is located on the top end of the tooling tray (1) away from the side push block quick clamp (2). Cam sliding plate (3) is disposed on the surface of the test object placement box (9). The probe mounting module (5) is mounted on the forward quick clamp (4). The test object (7) is placed on top of the test object placement box (9). The pressure cap (17) is located above the test object placement box (9). An upper pressure cover (8) is disposed above the lower pressure cover (17). Mounting plate (11) is located on the top of the tooling tray (1) at the end away from the front push quick clamp (4). Electrical signal conversion module (10) is located on the mounting plate (11). A lifting component (12) is disposed above the test object placement box (9). And a quick-release assembly (13) disposed below the mounting plate (11).

2. The tray fixture for quickly fixing PCB boards according to claim 1, characterized in that: The test object placement box (9) is equipped with a foolproof mounting block (14) at one end of the top two sides. The foolproof mounting block (14) is L-shaped. Support columns (15) are provided on both sides of the top of the test object placement box (9) away from the foolproof mounting block (14).

3. The tray fixture for quickly fixing PCB boards according to claim 1, characterized in that: One end of the test object placement box (9) is fixedly installed with a mounting base (24), the top of the mounting base (24) is provided with a rotating shaft (23), and a pressing block (18) is provided above the mounting base (24). The bottom end of the pressing block (18) and the top end of the upper cover (8) are connected to each other.

4. The tray fixture for quickly fixing PCB boards according to claim 3, characterized in that: Connecting blocks (19) are fixedly installed on both sides of one end of the bottom of the pressing block (18). A connecting hole (20) is provided on one side of the connecting block (19). The connecting hole (20) passes through the connecting block (19). The rotating shaft (23) slides through the two sets of connecting blocks (19) through the connecting hole (20).

5. The tray fixture for quickly fixing PCB boards according to claim 3, characterized in that: The lower pressure cover (17) has a first limiting groove (21) at the end away from the pressing top block (18), and the upper pressure cover (8) has a second limiting groove (22) at the end away from the pressing top block (18). The top of the test object placement box (9) is rotatably connected to a pressure cover hook (6) at the end away from the mounting base (24). The pressure cover hook (6) has a limiting horizontal block (16) at the end near the test object (7).

6. The tray fixture for quickly fixing PCB boards according to claim 5, characterized in that, The lifting assembly (12) includes: The first slide rail (121) is located on both sides of the top of the test object placement box (9) near the end of the cover hook (6). Two sets of first sliders (122) are disposed inside the first slide rail (121). The top plate (124) is located above the first slide rail (121). Connecting plates (123) are disposed on both sides of the bottom of the top plate (124). The end of the connecting plate (123) away from the top plate (124) is hinged to the top of the first slider (122). And a first spring (125) disposed on one side of the two sets of connecting plates (123) that are close to each other.

7. The tray fixture for quickly fixing PCB boards according to claim 6, characterized in that, The quick-release assembly (13) includes: Insertion holes (131) are provided on both sides of the top of the mounting plate (11), and the insertion holes (131) penetrate the mounting plate (11). Positioning blocks (132) are provided on both sides of the bottom of the electrical signal conversion module (10). The positioning blocks (132) penetrate the mounting plate (11) through the socket (131). In addition, a positioning hole (133) is provided at the bottom of one side of the positioning plug (132), the positioning hole (133) penetrating the positioning plug (132).

8. The tray fixture for quickly fixing PCB boards according to claim 7, characterized in that: The mounting plate (11) has a second slide rail (134) on both sides of its bottom. A second slider (135) is provided inside the second slide rail (134). A limit rod (137) is provided on one side of the second slider (135). One end of the limit rod (137) passes through the positioning hole (133) and penetrates the positioning block (132).

9. The tray fixture for quickly fixing PCB boards according to claim 8, characterized in that: Mounting side plates (136) are fixedly installed at both ends of the bottom of the mounting plate (11). The mounting side plates (136) are located between two sets of second sliders (135). The two sets of mounting side plates (136) are provided with a limit rod (138) at one end close to each other. A movable sleeve block (1310) is provided on the surface of the limit rod (138). A second spring (139) is provided at one end of the surface of the limit rod (138). A connecting rod (1312) is provided on both sides of the movable sleeve block (1310). One end of the connecting rod (1312) is hinged to one side of the second slider (135). A pull rod (1311) is provided at the bottom of the movable sleeve block (1310). One end of the pull rod (1311) slides through one set of mounting side plates (136). A pull handle (1313) is provided at the end of the pull rod (1311) away from the movable sleeve block (1310).

10. The method for operating the tray fixture for quickly fixing PCB boards as described in claim 9, characterized in that, Includes the following steps, When it is necessary to remove and replace the test object (7) on the test object placement box (9), first flip the cover hook (6) so that the cover hook (6) and the limiting horizontal block (16) move out from the second limiting slot (22) on the upper cover (8) and the first limiting slot (21) on the lower cover (17); Then, through the rebound force of the first spring (125), the angle between the two sets of connecting plates (123) at the bottom of the top plate (124) and the top plate (124) decreases, causing the two sets of first sliders (122) to move closer to each other within the first slide rail (121), and then causing the top plate (124) to rise. When the top plate (124) rises, the lower cover (17) can be automatically pushed open. At this point, simply rotate the lower cover (17) and the upper cover (8) according to the rotation axis (23) being located at the axis center, so that the test object (7) on the test object placement box (9) can be fully exposed, and then it is convenient to take out and replace the test object (7); After replacing the test object (7) on the test object placement box (9), first press the lower pressure cover (17) and the upper pressure cover (8) back onto the top of the test object placement box (9), and then reset the pressure cover hook (6).

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