Probe card fixing assembly for easy installation

Abstract

The utility model relates to the technical field of semiconductor test, disclose probe card fixing assembly convenient to installation, including the bottom disc, the outer wall fixed connection of bottom disc has drive switch, the inside of bottom disc is provided with self -adaptation telescopic mechanism, the bottom of bottom disc is provided with press locking mechanism, the self -adaptation telescopic mechanism includes rotary shaft no.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor testing technology, and in particular to a probe card fixing assembly that is easy to install. Background Technology

[0002] Easy-to-install probe card fixing components are mechanical devices used in the field of semiconductor testing. They are applied in probe station testing equipment, and their core function is to quickly and stably fix the probe card on the test platform to ensure precise contact between the probe card and the device under test on the wafer, thereby realizing electrical performance testing. The ease of installation of this component directly affects the testing efficiency, especially in mass production testing scenarios, where it is of great significance for quickly changing probe cards and shortening equipment downtime.

[0003] Traditional easy-to-install probe card fixing components use a screw-fixing structure, consisting of a base, pressure block, and fastening screws. During use, the probe card must be placed in a preset position on the base, and multiple fastening screws are manually rotated to press the pressure block against the edge of the probe card. Fixation is achieved through the mechanical locking of the screws with the threaded holes. This structure has significant drawbacks: installation requires tightening each screw individually, ensuring even force on each screw to prevent probe card deformation, making the operation cumbersome and time-consuming. Disassembly also requires loosening each screw individually, reducing testing efficiency in scenarios with frequent probe card replacements. Furthermore, repeated screw tightening causes thread wear, affecting fixation stability and increasing maintenance costs.

[0004] To address the cumbersome operation of screw fixing, existing technologies employ an improved snap-fit ​​structure. This structure consists of a base with snap-fit ​​components and elastic claws. In use, the probe card is aligned with the base, and pressing or rotating causes the snap-fit ​​of the elastic claws to automatically engage with the slots on the edge of the probe card, achieving rapid fixing. However, this improved structure still has limitations in practical applications. Because the size and position of the snap-fit ​​and elastic claws are fixed, it can only accommodate probe cards of specific sizes and shapes. When faced with probe cards of different sizes or irregular shapes, the snap-fit ​​cannot adaptively adjust its clamping range, resulting in uneven clamping force and ineffective fixing. It requires replacing the snap-fit ​​components with the corresponding specifications, indicating poor versatility. The root cause is that the existing snap-fit ​​structure lacks an adjustable clamping size adaptation mechanism, making it impossible to flexibly adjust according to the shape characteristics of the probe card. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a probe card fixing assembly that is easy to install, aiming to improve the problem that the existing buckle structure lacks an adjustable clamping size adaptation mechanism and cannot be flexibly adjusted according to the shape characteristics of the probe card.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a probe card fixing assembly that is easy to install, including a chassis, a drive switch fixedly connected to the outer wall of the chassis, an adaptive telescopic mechanism provided inside the chassis, and a pressing locking mechanism provided at the bottom of the chassis.

[0007] The adaptive telescopic mechanism includes a second rotating shaft, which is fixedly connected to the top side of the inner wall of the chassis. A rotating base plate is rotatably connected to the top outer side of the second rotating shaft. Multiple first rotating shafts are fixedly connected to the bottom perimeter of the rotating base plate. Corresponding folding arms are rotatably connected to the outer walls of the multiple first rotating shafts. The other end of each of the multiple folding arms is rotatably connected to a corresponding first rotating shaft. Two cylinders are installed inside the chassis. The left end of each of the two cylinders is fixedly connected to the same connecting rod, which is fixedly connected to the bottom of the connecting seat.

[0008] As a further description of the above technical solution:

[0009] The pressing and locking mechanism includes a slide rod. Multiple slots are provided on the bottom of the chassis. Two sliding grooves are provided on both sides of the inner wall of each slot. A slide rod is slidably connected to the inner wall of each of the two sliding grooves. A spring is provided on the outside of each of the two slide rods. One adjacent end of each of the two slide rods is fixedly connected to the side of two corresponding push blocks away from each other. One adjacent end of each of the two springs is fixedly connected to the side of two corresponding push blocks away from each other. A fixing post is provided outside the slots. A sliding column is fixedly connected to the top of the fixing post. A slider is slidably connected to the outside of the sliding column. A locking block is fixedly connected to the top of the sliding column.

[0010] As a further description of the above technical solution:

[0011] The chassis has multiple slide rails around its top, and each slide rail has a slidably connected claw.

[0012] As a further description of the above technical solution:

[0013] Each of the multiple claws has a push plate two fixedly connected to its top, and each of the multiple push plates two has two telescopic rods fixedly connected to its front.

[0014] As a further description of the above technical solution:

[0015] Two springs are fixedly connected to the outside of each of the two telescopic rods, and the same push plate is fixedly connected to the front end of each of the two telescopic rods.

[0016] As a further description of the above technical solution:

[0017] The push plate has two threaded grooves inside, and the inner walls of the two threaded grooves are threaded with screws.

[0018] As a further description of the above technical solution:

[0019] A rubber protective pad is fixedly connected to the front side of the push plate, and a pressure gauge is fixedly connected to the left side of the outer wall of the chassis. The pressure gauge is electrically connected to the rubber protective pad.

[0020] As a further description of the above technical solution:

[0021] A sensor button is fixedly connected to the inner wall of the card slot, and a sensor light is fixedly connected to the right side of the outer wall of the chassis. The sensor button is electrically connected to the sensor light.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the cylinder is extended and retracted by a drive switch, and the claws slide along the slide rail via the connecting rod and connecting seat. At the same time, the rotating base plate rotates around the second rotating shaft, and the first rotating shaft drives the folding arm to adjust the position of multiple claws synchronously, which solves the problem that the fixing components in the prior art cannot adapt to probe cards of various sizes.

[0024] 2. In this utility model, the pressing and locking mechanism inserts the locking block into the slot, and the pressing push block compresses the spring. The slide rod slides along the slide groove to ensure the horizontal movement of the push block. After the locking block is in place, the spring pushes the push block to lock between the slider and the locking block to achieve locking. When unlocking, pressing causes the push block to retract, which drives the slider to slide up the slide column to complete the unlocking. This solves the problem that the fixed components are inconvenient to install and replace in the prior art. Attached Figure Description

[0025] Figure 1 This is a perspective view of the probe card fixing assembly for easy installation proposed in this utility model;

[0026] Figure 2 This is a front view of the probe card fixing assembly that is easy to install according to this utility model;

[0027] Figure 3 This is a schematic diagram of a partial structure of the probe card fixing assembly that is easy to install according to this utility model;

[0028] Figure 4 This is a cross-sectional view of the press-locking mechanism of the probe card fixing assembly that is easy to install according to this utility model;

[0029] Figure 5 This is a partial exploded view of the probe card fixing assembly for easy installation proposed in this utility model;

[0030] Figure 6 This is a schematic diagram of the adaptive telescopic mechanism of the probe card fixing assembly that is easy to install, as proposed in this utility model.

[0031] Legend:

[0032] 1. Chassis; 2. Adaptive telescopic mechanism; 201. Rotating base plate; 202. Rotating shaft one; 203. Folding arm; 204. Rotating shaft two; 205. Cylinder; 206. Connecting rod; 207. Connecting seat; 3. Press-locking mechanism; 301. Slot; 302. Slide groove; 303. Slide rod; 304. Spring one; 305. Push block; 306. Fixed column; 307. Slide column; 308. Slider; 309. Locking block; 4. Drive switch; 5. Slide rail; 6. Claw; 7. Rubber protective pad; 8. Pressure gauge; 9. Threaded groove; 10. Push plate one; 11. Telescopic rod; 12. Spring two; 13. Push plate two; 14. Sensor button; 15. Sensor light; 16. Screw. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figure 1 , Figure 3 and Figure 6This utility model provides an embodiment of a probe card fixing assembly that is easy to install. The assembly includes a chassis 1, which serves as the basic load-bearing structure for mounting and supporting the various components. A drive switch 4 is fixedly connected to the outer wall of the chassis 1. The drive switch 4 controls the start and stop of the cylinder 205 to achieve the extension and retraction of the claw 6. An adaptive extension mechanism 2 is provided inside the chassis 1. This mechanism automatically adjusts the position of the claw 6 according to the size of the probe card. A pressing and locking mechanism 3 is provided at the bottom of the chassis 1. The locking mechanism 3 is used to quickly fix and unlock the chassis 1 and the test platform. The adaptive telescopic mechanism 2 includes a second rotating shaft 204, which is fixedly connected to the top side of the inner wall of the chassis 1. The second rotating shaft 204 provides a rotation axis for the rotating base plate 201, ensuring that the rotating base plate 201 can rotate stably. The rotating base plate 201 is rotatably connected to the top outer side of the second rotating shaft 204. The rotating base plate 201 drives the folding arm 203 to move synchronously through rotation, thereby realizing the linkage adjustment of the chuck 6. The bottom four of the rotating base plate 201 Multiple rotating shafts 202 are fixedly connected around the circumference, providing rotational connection points for the folding arm 203, allowing the folding arm 203 to rotate flexibly around them. Corresponding folding arms 203 are rotatably connected to the outer walls of each of the rotating shafts 202. The folding arms 203 transmit the rotational force of the rotating base plate 201, converting the rotational motion into linear sliding of the chuck 6. The other end of each folding arm 203 is rotatably connected to a corresponding rotating shaft 202, which also serves to connect the folding arm 203 to the chuck 6. The folding arm 203 can drive the claw 6 to move smoothly. The chassis 1 has two cylinders 205 inside. The two cylinders 205 serve as a power source to provide driving force for the sliding of the claw 6. The left end of each of the two cylinders 205 is fixedly connected to the same connecting rod 206. The connecting rod 206 is used to integrate the driving force of the two cylinders 205 and transmit it synchronously to the connecting seat 207. The connecting rod 206 is fixedly connected to the bottom of the connecting seat 207. The connecting seat 207 is used to transmit the force of the connecting rod 206 to the claw 6 to realize the extension and retraction of the claw 6.

[0035] Specifically, the second rotating shaft 204 in the adaptive telescopic mechanism 2 is fixed to the top side of the inner wall of the chassis 1, providing rotational support for the rotating base plate 201. The rotating base plate 201 can rotate around the second rotating shaft 204. Multiple rotating shafts 202 fixed around its bottom provide connection points for the folding arm 203. One end of the folding arm 203 is rotatably connected to the first rotating shaft 202, and the other end is rotatably connected to the corresponding first rotating shaft 202. The rotation of the rotating base plate 201 drives the folding arm 203 to move in tandem. Two cylinders 205 inside the chassis 1 provide driving force. The same connecting rod 206 fixed at its left end integrates the force of the two cylinders 205. The connecting rod 206 is fixedly connected to the bottom of the connecting seat 207, transmitting the force to the connecting seat 207, thereby driving the claw 6 to move. The various components cooperate to realize the extension and synchronous adjustment of the claw 6 to adapt to probe cards of different sizes.

[0036] Reference Figure 1 , Figure 2 and Figure 4 The pressing and locking mechanism 3 includes a slide rod 303, which restricts the movement trajectory of the push block 305 to ensure stable horizontal sliding. Multiple slots 301 are provided at the bottom of the chassis 1 for the insertion of the block 309, providing a positioning base for the connection between the fixing post 306 and the chassis 1. Two sliding grooves 302 are provided on both sides of the inner wall of each slot 301, providing a sliding channel for the slide rod 303 to ensure smooth movement. The inner walls of both sliding grooves 302 are slidably connected to the slide rod 303. Springs 304 are provided on the outside of each slide rod 303, providing a restoring force for the push block 305, allowing it to automatically pop out and lock after the block 309 is in place. The adjacent ends of the two slide rods 303 are fixedly connected to the opposite side of the corresponding two push blocks 305. The push blocks 305 are used to... The lower clip is positioned between the slider 308 and the locking block 309 to lock the fixed post 306 to the chassis 1. The adjacent ends of the two springs 304 are fixedly connected to the opposite side of the corresponding push blocks 305. The outside of the slot 301 is provided with a fixed post 306, which is used to connect the test platform and the sliding post 307, and plays a role in bearing and connecting. The top of the fixed post 306 is fixedly connected to the sliding post 307, which is used to provide sliding support for the slider 308, allowing the slider 308 to move up and down along it. The outside of the sliding post 307 is slidably connected to the slider 308, which is used to cooperate with the push block 305. When unlocking, the slider 308 moves with the push block 305 to release the locking block 309. The top of the sliding post 307 is fixedly connected to the locking block 309, which is used to insert into the slot 301. Through cooperation with the push block 305 and the slider 308, the fixing and unlocking of the fixed post 306 and the chassis 1 are completed.

[0037] Specifically, in the pressing and locking mechanism 3, the slide rod 303 is slidably connected in the slide grooves 302 on both sides of the inner wall of the slot 301. The slide rod 303 is fixedly connected to the push block 305. The slide grooves 302 provide a sliding channel for the slide rod 303. The slide rod 303 restricts the push block 305 to slide stably in the horizontal direction. The side of the push block 305 away from the spring 304 is connected to the spring 304, which provides a restoring force for the push block 305. The slide post 307 at the top of the fixed post 306 is externally connected to the slider 308. The locking block 309 at the top of the slide post 307 is inserted into the slide post 307. When the slot 301 is engaged, the push block 305 is pressed to compress the spring 304. After the locking block 309 is in place, the spring 304 pushes the push block 305 to lock between the slider 308 and the locking block 309, thereby locking the fixing post 306 and the chassis 1. When unlocking, the push block 305 is pressed to retract, the spring 304 is compressed, and the push block 305 contacts the lower end of the slider 308. When pulled out, the push block 305 drives the slider 308 to slide up along the sliding post 307, and the locking block 309 disengages from the slot 301. The cooperation of each component realizes the rapid fixing and unlocking of the chassis 1 and the test platform.

[0038] Reference Figure 1 , Figure 2 and Figure 5 Multiple slide rails 5 are provided around the top of the chassis 1. The slide rails 5 provide a sliding path for the claws 6 to limit their movement direction. Claws 6 are slidably connected to the inner walls of the multiple slide rails 5. The claws 6 are used to adjust their position by sliding to accommodate probe cards of different sizes. Push plates 2 13 are fixedly connected to the top of the multiple claws 6. Push plates 2 13 are used to connect the claws 6 to the telescopic rods 11 to transmit power. Two telescopic rods 11 are fixedly connected to the front of the multiple push plates 2 13. The telescopic rods 11 are used to adjust the distance between push plates 1 10 and push plates 2 13 by telescopic adjustment. Two springs 2 12 are fixedly connected to the outside of the two telescopic rods 11. Springs 2 12 are used to buffer the clamping force and keep the pressure of each claw 6 balanced. The same push plate 10 is fixedly connected to the front end of the two telescopic rods 11. Push plate 10 is used to directly contact the probe card to achieve stable clamping.

[0039] Specifically, multiple slide rails 5 around the top of the chassis 1 provide a sliding path for the claws 6, restricting the movement direction of the claws 6, allowing the claws 6 to slide and adjust their position along the slide rails 5 to accommodate probe cards of different sizes. The push plate 2 13 fixed on the top of the claws 6 connects the claws 6 to the telescopic rod 11, transmitting the power of the claws 6 to the telescopic rod 11. The two telescopic rods 11 fixed at the front of the push plate 2 13 can extend and retract to adjust the distance between the push plate 1 10 and the push plate 2 13. The two springs 2 12 on the outside of the telescopic rod 11 can buffer the clamping force, keeping the pressure of each claw 6 balanced. The same push plate 10 fixed at the front end of the telescopic rod 11 directly contacts the probe card. Through the cooperation of various components, the claws 6 slide and adjust their position along the slide rails 5, the telescopic rod 11 extends and retracts in coordination with the springs 2 12 to adjust the pressure, and the push plate 1 10 stably clamps the probe card, achieving adaptation and stable clamping of probe cards of different sizes.

[0040] Reference Figure 1 , Figure 4 and Figure 5 The push plate 10 has two threaded grooves 9 inside. The threaded grooves 9 provide threaded connection positions for screws 16 to fix the components. The inner walls of the two threaded grooves 9 are threaded with screws 16. The screws 16 are used to fix the push plate 10 and the telescopic rod 11 through threaded engagement. A rubber protective pad 7 is fixedly connected to the front side of the push plate 10. The rubber protective pad 7 is used to directly contact the probe card to avoid scratching its surface. A pressure gauge 8 is fixedly connected to the left side of the outer wall of the chassis 1. The pressure gauge 8 is used to display the pressure value of the rubber protective pad 7 in real time. The pressure gauge 8 and the rubber protective pad 7 are electrically connected. The two electrical connections can realize the transmission and display of pressure signals. A sensor button 14 is fixedly connected to the inner wall of the card slot 301. The sensor button 14 is used to sense whether the card block 309 is inserted in place. A sensor light 15 is fixedly connected to the right side of the outer wall of the chassis 1. The sensor light 15 is used to indicate to the operator whether the card block 309 is installed in place by lighting up. The sensor button 14 and the sensor light 15 are electrically connected. The two electrical connections can realize the transmission of sensor signals and the linkage of light prompts.

[0041] Specifically, the two threaded grooves 9 inside the push plate 10 are threadedly connected to the screws 16. The screws 16 fix the push plate 10 to the telescopic rod 11 through the threaded engagement, thus realizing the installation and fixation of the push plate 10. The rubber protective pad 7 on the front side of the push plate 10 directly contacts the probe card to prevent the probe card surface from being scratched. The pressure gauge 8 on the left side of the outer wall of the chassis 1 is electrically connected to the rubber protective pad 7. The pressure on the rubber protective pad 7 is transmitted to the pressure gauge 8 through the electrical connection. The pressure gauge 8 displays the pressure value in real time, making it convenient for the operator to monitor the pressure. The sensing button 14 on the inner wall of the card slot 301 is electrically connected to the sensing light 15 on the right side of the outer wall of the chassis 1. When the card block 309 is inserted into the position and touches the sensing button 14, the sensing signal is transmitted to the sensing light 15 through the electrical connection. The sensing light 15 lights up to indicate to the operator that the card block 309 has been installed in place. Through the above cooperation, the components realize the functions of stable installation of the push plate 10, protection of the probe card, real-time pressure monitoring, and installation confirmation.

[0042] Working principle: When installing the probe card, first operate the drive switch 4. The drive switch 4 controls the cylinder 205 to extend and retract. The extension and retraction of the cylinder 205 drives the connecting rod 206 to move. The connecting rod 206 then drives the connecting seat 207 to move. The movement of the connecting seat 207 will cause the claw 6 to slide on the slide rail 5, realizing the initial position adjustment of the claw 6. At the same time, the rotating base plate 201 rotates on the rotating shaft 204. The rotation of the rotating base plate 201 will drive the folding arm 203 to rotate accordingly. The rotation of the folding arm 203 will cause the four slide rails 5 to slide on the claw 6 simultaneously, thereby realizing adaptive adjustment for probe cards of different sizes, solving the problem of difficulty in adapting to probe cards of different sizes in the existing technology.

[0043] When installing chassis 1, the fixing post 306 is installed at one end of the test platform. Then, the locking block 309 is inserted into the locking slot 301. During the process of entering the locking slot 301, the locking block 309 will press the push block 305, causing the push block 305 to slide within the sliding groove 302. The sliding rod 303 ensures that the push block 305 always moves in a horizontal direction, ensuring the stability of the movement. When the locking block 309 has entered a certain distance, the push block 305 is pushed out by the elastic force of the spring 304 and locked between the slider 308 and the locking block 309, thus fixing chassis 1 to the test platform. The whole process does not require complicated operation, solving the problem of cumbersome installation of traditional chassis 1. At this time, the top of the locking block 309 touches the sensor button 14, and the sensor light 15 lights up, allowing the operator to intuitively judge whether it is locked in place. When it is necessary to remove chassis 1, continue to press for a distance, and the push block 305 will retract. Inside the slide groove 302, until it contacts the lower end of the slider 308, then pull it outwards. The push block 305 will slide the slider 308 upwards, thus completing the unlocking. The operation is simple and quick. After the probe card is installed, the rubber protective pad 7 will contact the probe card to protect it and prevent damage. At the same time, the pressure will be transmitted to the pressure gauge 8. The operator can observe the pressure by observing the pressure gauge 8 to understand the pressure situation and avoid excessive pressure from adversely affecting the probe card. The push plate 10 has a threaded groove 9 and is fixed to the telescopic rod 11 by the screw 16, which realizes the detachability of the push plate 10. It is convenient to replace it according to the probe card of different shapes and improves the versatility of the components. The spring 2 12 between the push plate 2 13 and the push plate 10 can balance the pressure between the four claws 6, making the pressure tend to be stable and ensuring the stability of the probe card installation.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An easy-to-install probe card fixing assembly, including a chassis (1), characterized in that: A drive switch (4) is fixedly connected to the outer wall of the chassis (1), an adaptive telescopic mechanism (2) is provided inside the chassis (1), and a pressing locking mechanism (3) is provided at the bottom of the chassis (1). The adaptive telescopic mechanism (2) includes a second rotating shaft (204), which is fixedly connected to the top side of the inner wall of the chassis (1). A rotating base plate (201) is rotatably connected to the outer side of the top of the second rotating shaft (204). Multiple rotating shafts (202) are fixedly connected around the bottom of the rotating base plate (201). Corresponding folding arms (203) are rotatably connected to the outer walls of the multiple rotating shafts (202). The other end of the multiple folding arms (203) is rotatably connected to the corresponding rotating shaft (202). Two cylinders (205) are provided inside the chassis (1). The left end of the two cylinders (205) is fixedly connected to the same connecting rod (206). The connecting rod (206) is fixedly connected to the bottom of the connecting seat (207).

2. The probe card fixing assembly for easy installation according to claim 1, characterized in that: The pressing and locking mechanism (3) includes a slide rod (303). The bottom of the chassis (1) is provided with multiple slots (301). Two slide grooves (302) are provided on both sides of the inner wall of the multiple slots (301). The inner walls of the two slide grooves (302) are slidably connected to the slide rods (303). The outer side of the two slide rods (303) is provided with springs (304). The adjacent ends of the two slide rods (303) are fixedly connected to the opposite side of the corresponding two push blocks (305). The adjacent ends of the two springs (304) are fixedly connected to the opposite side of the corresponding two push blocks (305). The outer side of the slots (301) is provided with a fixing post (306). The top of the fixing post (306) is fixedly connected with a slide post (307). The outer side of the slide post (307) is slidably connected with a slider (308). The top of the slide post (307) is fixedly connected with a locking block (309).

3. The probe card fixing assembly for easy installation according to claim 1, characterized in that: The chassis (1) has multiple slide rails (5) around its top, and the inner walls of the multiple slide rails (5) are slidably connected with claws (6).

4. The easy-to-install probe card fixing assembly according to claim 3, characterized in that: Each of the multiple claws (6) has a push plate (13) fixedly connected to its top, and each of the multiple push plates (13) has two telescopic rods (11) fixedly connected to its front.

5. The probe card fixing assembly for easy installation according to claim 4, characterized in that: Two springs (12) are fixedly connected to the outside of each of the two telescopic rods (11), and the same push plate (10) is fixedly connected to the front end of each of the two telescopic rods (11).

6. The probe card fixing assembly for easy installation according to claim 5, characterized in that: The push plate (10) has two threaded grooves (9) inside, and the inner walls of the two threaded grooves (9) are threaded with screws (16).

7. The probe card fixing assembly for easy installation according to claim 5, characterized in that: A rubber protective pad (7) is fixedly connected to the front side of the push plate (10), and a pressure gauge (8) is fixedly connected to the left side of the outer wall of the chassis (1). The pressure gauge (8) is electrically connected to the rubber protective pad (7).

8. The probe card fixing assembly for easy installation according to claim 2, characterized in that: A sensor button (14) is fixedly connected to the inner wall of the slot (301), and a sensor light (15) is fixedly connected to the right side of the outer wall of the chassis (1). The sensor button (14) is electrically connected to the sensor light (15).

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