Detection card withdrawing structure of fluorescence immunoassay analyzer

Abstract

The utility model discloses a fluorescence immunoassay analyzer detection card withdrawing structure, which belongs to the field of in vitro diagnosis detection instruments, and comprises a first support plate and a second support plate, the first support plate is provided with a support table lower than the surface of the first support plate, the second support plate is provided with a side plate, and the side plate is provided with a clamping groove. The side plate is located on one side of the supporting table and forms a clamping groove with the supporting table, a second elastic piece is arranged on the groove wall of the clamping groove, and a first elastic piece is arranged on the second supporting plate and located above the clamping groove. According to the scheme, the first elastic piece is located above the clamping groove and can abut against the reagent card in the clamping groove, edge warping of the reagent card in the vertical direction is prevented, when the second elastic piece makes contact with the reagent card, the second elastic piece pushes the reagent card to be tightly attached to the other side wall of the clamping groove, and centering is achieved; therefore, by means of the first elastic piece and the second elastic piece, the problem that the side edge of the reagent card is warped up in the centering process is solved, and the detection effect of the light path module on the reagent card is improved.

Description

Technical Field

[0001] The utility model relates to a structure of a fluorescent immunoassay analyzer, and more specifically to a detection card-removing structure of a fluorescent immunoassay analyzer. Background Art

[0002] There is a gap between the reagent card and the reagent card support structure of the existing multi-channel fluorescent immunoassay strip detection structure. The reagent card may be biased to one side and not centered. Since the color development area of ​​the reagent card sample addition reaction is uneven, if the reagent card is not centered, it may cause large differences between different batches of reagents and different instruments, affecting the accuracy of the test results. In the process of centering the reagent card, it may also cause the reagent card to slightly tilt upward on one side, affecting the test effect.

[0003] For example: Chinese patent announcement number CN212780838U, announcement date March 23, 2021, the name of the utility model is a multi-channel fluorescent immunoassay analyzer. The application discloses a card slot structure for placing reagent cards of a fluorescent immunoassay analyzer, and positioning bosses are provided on the side walls of the card slot. The reagent card is laterally fixed in the card slot by the positioning bosses. This scheme can achieve the center positioning of the reagent card and improve the positioning effect; however, in this scheme, after the reagent card contacts the positioning bosses, it is easy for the reagent card to be unevenly stressed in the lateral direction, causing one side of the reagent card to slightly warp up, affecting the detection effect of the optical path module. Utility Model Content

[0004] The utility model overcomes the problem of side warping during the centering process of the reagent card of the existing multi-channel fluorescent immunoassay analyzer, and provides a fluorescent immunoassay detection card ejection structure. In this scheme, an elastic member is added in the card slot of the reagent card to complete the centering and prevent the unilateral warping problem, thereby improving the detection effect of the analyzer.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a fluorescent immunoassay instrument detection card withdrawal structure, including a first support plate and a second support plate, a support platform lower than the surface of the first support plate is provided on the first support plate, a side plate is provided on the second support plate, the side plate is located on one side of the support plate and forms a card slot with the support plate, the slot wall of the card slot is provided with a second spring sheet, and a first spring sheet is provided on the second support plate and located above the card slot. In this solution, the support platform on the first support plate is used to support the reagent card, the support platform is an L-shaped support platform, and together with the side plate on the second support plate, a card slot is formed for accommodating the reagent card. When the reagent card just enters the card slot, the first spring sheet is located above the card slot, and will press the reagent card in the card slot to prevent the reagent card from warping in the vertical direction. As the reagent card continues to move into the card slot, the second spring sheet contacts the reagent card, and the second spring sheet pushes the reagent card to the other side wall of the card slot to achieve centering, so that the reagent card will not warp up on the side during the centering process through the first spring sheet and the second spring sheet, thereby improving the detection effect of the optical path module on the reagent card.

[0006] Preferably, the second support plate is located above the first support plate, and a through hole corresponding to the card slot is provided on the second support plate, and an optical path module is provided at the position of the through hole. A first spring sheet is provided on the second support plate, and the second support plate is located above the first support plate, so that the second support plate is also located above the card slot, that is, the first spring sheet can press the upper surface of the reagent card from above, and an optical path module is provided on the through hole on the second support plate for detecting the reagent card, and the through hole structure on the second support plate is provided to prevent the second support plate from blocking the reagent card and making it impossible for the optical path module to detect it.

[0007] Preferably, a workbench is further included, the first support plate and the second support plate are arranged on the workbench, and a waste port is arranged on the workbench corresponding to the card slot position. The waste port on the workbench is used for recycling the reagent card after it is withdrawn, and the reagent card falls into the waste port after falling off from the card slot position to complete recycling.

[0008] Preferably, a reagent card transfer mechanism is provided on the workbench near the first spring sheet, and a card return slot is provided on the reagent card transfer mechanism, and the card return slot corresponds to the position of the card slot. The reagent card transfer mechanism will transport the reagent card to the support table, and the card return slot on the reagent card transfer mechanism is connected with the card slot, so that the reagent card can be transferred from the reagent card transfer mechanism to the card slot.

[0009] Preferably, the reagent card transfer mechanism is provided with a push bar block that can reciprocate along the card withdrawal slot. The push bar block is used to push the reagent card along the card withdrawal slot into the card slot, thereby driving the reagent card.

[0010] Preferably, a card-returning baffle is provided on the side of the workbench away from the reagent card transfer mechanism, and the card-returning baffle is located on the side of the card slot away from the side plate, and the top of the card-returning baffle is flush with the card slot. The card-returning baffle is used to complete the reagent card removal operation. Since the card slot is composed of a support platform and a side plate, and the support platform is L-shaped, when the support platform is separated from the side plate, the card-returning baffle pushes the reagent card from one side of the card slot, and the reagent card can be pushed out from the side of the card slot, and the reagent card will fall off when it loses support.

[0011] Preferably, the support platform is provided with a slide groove for accommodating a card ejection baffle, wherein the slide groove enables the card ejection baffle to move along the width direction of the card slot, so that the card ejection baffle pushes the reagent card out from the side to complete the card ejection operation.

[0012] Preferably, the first support plate is connected to a driving device, and the driving device drives the first support plate to move relative to the second support plate, and the movement direction of the first support plate is the width direction of the card slot. The driving device is used to drive the first support plate to move, and when the first support plate is close to the second support plate, the support platform and the side plate form a card slot structure, and when the first support plate is separated from the second support plate, the reagent card can be detached from the support platform.

[0013] Preferably, the first support plate is provided with a sensing sheet, the workbench is provided with a first sensor, and the first sensor corresponds to the height position of the sensing sheet. The sensing sheet and the first sensor are used to determine whether the movement of the first support plate is in place, so that the first support plate does not collide when it approaches the second support plate, and ensure that the card slot is of a suitable size.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) the first spring sheet and the second spring sheet structure are used to prevent the reagent card from tilting in the card slot and to achieve a good centering effect; (2) the position of the reagent card is fixed to avoid uneven color development of the reagent card and solve the problem of large differences in test results between different reagent cards and different instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an axonometric drawing of the present utility model.

[0016] Figure 2 This is a state diagram of the reagent card of the utility model when it is located in the card slot.

[0017] Figure 3 It is an enlarged schematic diagram of the reagent card of the utility model when it cooperates with the second spring piece.

[0018] Figure 4 It is a cross-sectional view of the reagent card of the utility model when it is matched with the card slot.

[0019] In the figure: 1. first support plate, 2. second support plate, 3. support table, 4. side plate, 5. card slot, 6. first spring sheet, 7. second spring sheet, 8. through hole, 9. optical path module, 10. workbench, 11. waste port, 12. reagent card transfer mechanism, 13. card ejection slot, 14. push bar block, 15. card ejection baffle, 16. slide slot, 17. drive device, 18. induction sheet, 19. first sensor, 20. reagent card, 21. flat plate, 22. conveyor belt, 23. rotating motor, 24. second sensor, 25. third sensor. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0021] Example 1: A fluorescent immunoassay analyzer detects a card-removal structure, such as Figure 1 As shown, the workbench 10 and the reagent card transfer mechanism 12 are close together. The workbench 10 and the reagent card transfer mechanism 12 are arranged on the workbench 10. The first support plate 1 and the second support plate 2 are arranged below the second support plate 2, and the first support plate 1 and the second support plate 2 are close to each other in the vertical direction. Figure 3 and Figure 4 As shown, a support platform 3 is provided on the first support plate 1, and the support platform 3 is on the side of the first support plate 1 and lower than the upper surface of the first support plate 1, so that the support platform 3 is L-shaped, and a side plate 4 is provided below the second support plate 2, the lowest position (bottom position) of the side plate 4 is flush with the surface of the support platform 3, and the side plate 4 is located on one side of the support platform 3, and when the support platform 3 and the side plate 4 are close to each other, a slot 5 structure can be formed.

[0022] A card ejection slot 13 is provided on the reagent card transfer mechanism 12, and the card ejection slot 13 is connected with the card slot 5 formed by the support platform 3 and the side plate 4. A flat plate 21 structure is provided on the upper surface of the reagent card transfer mechanism 12, and a slot body is provided on the flat plate 21 corresponding to the position of the card ejection slot 13, so that the card ejection slot 13 is exposed, and a transmission device is provided on the flat plate 21 along the length direction of the card ejection slot 13, and a transmission wheel is provided on each side of the transmission device, and a conveyor belt 22 is provided between the transmission wheels, and a push strip block 14 structure is fixed on the conveyor belt 22, and the position of the push strip block 14 is just located at the position of the card ejection slot 13. A rotating motor 23 is also provided on the flat plate 21, and the rotating motor 23 drives one of the transmission wheels to rotate, so that the conveyor belt 22 moves, and drives the push strip block 14 on the conveyor belt 22 to move along the length direction of the card ejection slot 13, such as Figure 1 As shown, when there is a reagent card 20 in the card ejection slot 13 , the push bar stopper 14 can push the reagent card 20 to the position of the card slot 5 and enter the card slot 5 .

[0023] It should be noted that a second sensor 24 and a third sensor 25 are also provided on the upper surface of the flat plate 21 structure. The second sensor 24 and the third sensor 25 are respectively located at the starting position and the end position of the push bar block 14. When the push bar block 14 moves to the corresponding sensor position, the rotating motor 23 will stop driving to prevent the push bar block 14 from exceeding the stroke position.

[0024] like Figure 2 As shown, a first spring piece 6 and a through hole 8 are provided on the upper surface of the second support plate 2. The position of the through hole 8 corresponds to the position of the card slot 5, and the first spring piece 6 is provided on the upper side of the end of the through hole 8 and is located at the notch where the reagent card 20 enters the card slot 5. One end of the first spring piece 6 is fixed to the second support plate 2, and the other end extends downward toward the card slot 5 and is bent so that the end of the first spring piece 6 is in a horizontal state. When the push bar block 14 pushes the reagent card 20 from the card ejection slot 13 into the card slot 5, the card slot 5 will be pressed by the horizontal end of the first spring piece 6, so that the reagent card 20 cannot be lifted up in the card slot 5. As shown in FIG. Figure 3 As shown, a second spring piece 7 is also provided on the slot wall of the card slot 5. Specifically, the second spring piece 7 is provided on the first support plate 1, that is, on the side wall of the L-shaped support platform 3 of the first support plate 1. One end of the second spring piece 7 is fixed to the side wall of the support platform 3, and the other end extends into the card slot 5 along the movement direction of the reagent card 20 and is bent into the card slot 5, so that the end of the second spring piece 7 is parallel to the length direction of the card slot 5. When the reagent card 20 enters the card slot 5, it abuts against the second spring piece 7. Under the action of the elastic force of the second spring piece 7, the reagent card 20 is pushed along the width direction of the card slot 5, and the other side of the reagent card 20 is pressed against the side plate 4 of the second support plate 2, thereby completing the centering operation of the reagent card 20. Since the first spring piece 6 has been pressed on the upper surface of the reagent card 20 at this time, the second spring piece 7 will not cause the edge of the reagent card 20 to warp when pushing the reagent card 20 from the side, which can improve the detection effect of the optical path module 9.

[0025] like Figure 1 and Figure 2 As shown, above the second support plate 2, and at the position of the through hole 8, an optical path module 9 is provided, which can detect the reagent card 20, and can detect the C and T lines on the reagent card 20, and give the detection result according to the color development degree of C and T. The through hole 8 structure runs through the second support plate 2, so that there is no object blocking between the reagent card 20 in the card slot 5 and the optical path module 9, which can ensure the normal detection of the optical path module 9.

[0026] A driving device 17 is also provided on the surface of the workbench. The driving device 17 can adopt a structure such as a servo motor or a telescopic cylinder. In the present embodiment, the driving device 17 specifically adopts a servo motor. The output end of the servo motor is fixedly connected to the first support plate 1, and can drive the first support plate 1 to move relative to the second support plate 2. The movement direction is along the width direction of the slot 5. When the servo motor drives the first support plate 1 to approach the second support plate 2, the support platform 3 on the first support plate 1 and the side plate 4 on the second support plate 2 can form a slot.

[0027] A card ejection baffle 15 is also provided on the workbench 10. Figure 1 and Figure 3 As shown, two card return baffles 15 are provided and are vertically arranged long strip structures, one of which is located on the outside of the first support plate 1, that is, on the outside of the card slot 5, and the other card return baffle 15 is located in the support platform 3 of the first support plate 1. Specifically, a slide groove 16 structure is provided on the support platform 3, and the length direction of the slide groove 16 is along the width direction of the card slot 5. The slide groove 16 runs through the surface of the support platform 3, so that the top of the card return baffle 15 can pass through the support platform 3 and the top of the card return baffle 15 is slightly higher than the surface of the support platform 3. It should also be noted that the two card return baffles 15 are located on the same side of the card slot 5. When the reagent card 20 moves into the card slot 5, the two card return baffles 15 can be on the side of the reagent card 20. When the driving device 17 (servo motor) drives the first support plate 1 to move away from the second support plate 2, since the card ejection baffle 15 is fixed on the workbench 10, the position will not change, and the card ejection baffle 15 is located on the side of the reagent card 20 (the side of the movement direction when the first support plate 1 moves away from the second support plate 2), the reagent card 20 on the support table 3 abuts against the two card ejection baffles 15, and the reagent card 20 gradually detaches from the support table 3 under the obstruction of the card ejection baffle 15, so that the reagent card 20 falls, completing the card ejection operation.

[0028] like Figure 1 As shown, a waste port 11 is also provided on the workbench 10, and the position of the waste port 11 is set directly below the card slot 5, that is, corresponding to the position of the side plate 4 of the second support plate 2. When the first support plate 1 is away from the second support plate 2, the card slot 5 structure disappears, and the reagent card 20 on the support table 3 is pushed out by the card ejection baffle 15 and falls into the waste port 11. A waste bin (not shown in the figure) is provided below the workbench 10 and corresponding to the waste port 11, and the waste bin can recycle the ejected reagent card 20.

[0029] Example 2: A fluorescent immunoassay analyzer detects a card-removal structure, such as Figure 1As shown, the workbench 10 and the reagent card transfer mechanism 12 are close together. The workbench 10 and the reagent card transfer mechanism 12 are arranged on the workbench 10. The first support plate 1 and the second support plate 2 are arranged below the second support plate 2, and the first support plate 1 and the second support plate 2 are close to each other in the vertical direction. Figure 3 and Figure 4 As shown, a support platform 3 is provided on the first support plate 1, and the support platform 3 is on the side of the first support plate 1 and lower than the upper surface of the first support plate 1, so that the support platform 3 is L-shaped, and a side plate 4 is provided below the second support plate 2, the lowest position (bottom position) of the side plate 4 is flush with the surface of the support platform 3, and the side plate 4 is located on one side of the support platform 3, and when the support platform 3 and the side plate 4 are close to each other, a slot 5 structure can be formed.

[0030] A card ejection slot 13 is provided on the reagent card transfer mechanism 12, and the card ejection slot 13 is connected with the card slot 5 formed by the support platform 3 and the side plate 4. A flat plate 21 structure is provided on the upper surface of the reagent card transfer mechanism 12, and a slot body is provided on the flat plate 21 corresponding to the position of the card ejection slot 13, so that the card ejection slot 13 is exposed, and a transmission device is provided on the flat plate 21 along the length direction of the card ejection slot 13, and a transmission wheel is provided on each side of the transmission device, and a conveyor belt 22 is provided between the transmission wheels, and a push bar block 14 structure is fixed on the conveyor belt 22, and the position of the push bar block 14 is just located at the position of the card ejection slot 13. A rotating motor 23 is also provided on the flat plate 21, and the rotating motor 23 drives one of the transmission wheels to rotate, so that the conveyor belt 22 moves, and drives the push bar block 14 on the conveyor belt 22 to move along the length direction of the card ejection slot 13, such as Figure 1 As shown, when there is a reagent card 20 in the card ejection slot 13 , the push bar stopper 14 can push the reagent card 20 to the position of the card slot 5 and enter the card slot 5 .

[0031] It should be noted that a second sensor 24 and a third sensor 25 are also provided on the upper surface of the flat plate 21 structure. The second sensor 24 and the third sensor 25 are respectively located at the starting position and the end position of the push bar block 14. When the push bar block 14 moves to the corresponding sensor position, the rotating motor 23 will stop driving to prevent the push bar block 14 from exceeding the stroke position.

[0032] like Figure 2As shown, a first spring piece 6 and a through hole 8 are provided on the upper surface of the second support plate 2. The position of the through hole 8 corresponds to the position of the card slot 5, and the first spring piece 6 is provided on the upper side of the end of the through hole 8 and is located at the notch where the reagent card 20 enters the card slot 5. One end of the first spring piece 6 is fixed to the second support plate 2, and the other end extends downward toward the card slot 5 and is bent so that the end of the first spring piece 6 is in a horizontal state. When the push bar block 14 pushes the reagent card 20 from the card ejection slot 13 into the card slot 5, the card slot 5 will be pressed by the horizontal end of the first spring piece 6, so that the reagent card 20 cannot be lifted up in the card slot 5. As shown in FIG. Figure 3 As shown, a second spring piece 7 is also provided on the slot wall of the card slot 5. Specifically, the second spring piece 7 is provided on the first support plate 1, that is, on the side wall of the L-shaped support platform 3 of the first support plate 1. One end of the second spring piece 7 is fixed to the side wall of the support platform 3, and the other end extends into the card slot 5 along the movement direction of the reagent card 20 and is bent into the card slot 5, so that the end of the second spring piece 7 is parallel to the length direction of the card slot 5. When the reagent card 20 enters the card slot 5, it abuts against the second spring piece 7. Under the action of the elastic force of the second spring piece 7, the reagent card 20 is pushed along the width direction of the card slot 5, and the other side of the reagent card 20 is pressed against the side plate 4 of the second support plate 2, thereby completing the centering operation of the reagent card 20. Since the first spring piece 6 has been pressed on the upper surface of the reagent card 20 at this time, the second spring piece 7 will not cause the edge of the reagent card 20 to warp when pushing the reagent card 20 from the side, which can improve the detection effect of the optical path module 9.

[0033] like Figure 1 and Figure 2 As shown, above the second support plate 2, and at the position of the through hole 8, an optical path module 9 is provided, which can detect the reagent card 20, and can detect the C and T lines on the reagent card 20, and give the detection result according to the color development degree of C and T. The through hole 8 structure runs through the second support plate 2, so that there is no object blocking between the reagent card 20 in the card slot 5 and the optical path module 9, which can ensure the normal detection of the optical path module 9.

[0034] A driving device 17 is also provided on the surface of the workbench. The driving device 17 can adopt a structure such as a servo motor or a telescopic cylinder. In the present embodiment, the driving device 17 specifically adopts a servo motor. The output end of the servo motor is fixedly connected to the first support plate 1, and can drive the first support plate 1 to move relative to the second support plate 2. The movement direction is along the width direction of the slot 5. When the servo motor drives the first support plate 1 to approach the second support plate 2, the support platform 3 on the first support plate 1 and the side plate 4 on the second support plate 2 can form a slot.

[0035] A card ejection baffle 15 is also provided on the workbench 10. Figure 1 and Figure 3 As shown, two card return baffles 15 are provided and are vertically arranged long strip structures, one of which is located on the outside of the first support plate 1, that is, on the outside of the card slot 5, and the other card return baffle 15 is located in the support platform 3 of the first support plate 1. Specifically, a slide groove 16 structure is provided on the support platform 3, and the length direction of the slide groove 16 is along the width direction of the card slot 5. The slide groove 16 runs through the surface of the support platform 3, so that the top of the card return baffle 15 can pass through the support platform 3 and the top of the card return baffle 15 is slightly higher than the surface of the support platform 3. It should also be noted that the two card return baffles 15 are located on the same side of the card slot 5. When the reagent card 20 moves into the card slot 5, the two card return baffles 15 can be on the side of the reagent card 20. When the driving device 17 (servo motor) drives the first support plate 1 to move away from the second support plate 2, since the card ejection baffle 15 is fixed on the workbench 10, the position will not change, and the card ejection baffle 15 is located on the side of the reagent card 20 (the side of the movement direction when the first support plate 1 moves away from the second support plate 2), the reagent card 20 on the support table 3 abuts against the two card ejection baffles 15, and the reagent card 20 gradually detaches from the support table 3 under the obstruction of the card ejection baffle 15, so that the reagent card 20 falls, completing the card ejection operation.

[0036] like Figure 1 As shown, a waste port 11 is also provided on the workbench 10, and the position of the waste port 11 is set directly below the card slot 5, that is, corresponding to the position of the side plate 4 of the second support plate 2. When the first support plate 1 is away from the second support plate 2, the card slot 5 structure disappears, and the reagent card 20 on the support table 3 is pushed out by the card ejection baffle 15 and falls into the waste port 11. A waste bin (not shown in the figure) is provided below the workbench 10 and corresponding to the waste port 11, and the waste bin can recycle the ejected reagent card 20.

[0037] A first sensor 19 is also provided on the surface of the workbench 10, and a sensing sheet 18 is provided on the first support plate 1. When the first support plate 1 and the second support plate 2 are close to form a card slot 5 structure, the position of the first sensor 19 corresponds to the position of the sensing sheet 18. At this time, the driving device 17 will stop driving to prevent the first support plate 1 from colliding with the second support plate 2. The sensing sheet 18 and the first sensor 19 are used to determine whether the movement of the first support plate 1 is in place, and can also ensure that the size of the card slot 5 is appropriate.

Claims

1. A fluorescent immunoassay analyzer for detecting a card ejection structure, characterized in that: It includes a first support plate and a second support plate, wherein the first support plate is provided with a support platform lower than the surface of the first support plate, the second support plate is provided with a side plate, the side plate is located at one side of the support platform and forms a slot with the support platform, the slot wall of the slot is provided with a second spring sheet, and the second support plate is provided with a first spring sheet above the slot.

2. A fluorescent immunoassay analyzer detection card ejection structure according to claim 1, characterized in that: The second support plate is located above the first support plate. A through hole corresponding to the card slot is provided on the second support plate. An optical path module is provided at the position of the through hole.

3. A fluorescent immunoassay analyzer detection card ejection structure according to claim 1 or 2, characterized in that: It also includes a workbench, the first support plate and the second support plate are arranged on the workbench, and a waste port is arranged on the workbench corresponding to the position of the card slot.

4. The fluorescent immunoassay analyzer detection card ejection structure according to claim 3, characterized in that: A reagent card transfer mechanism is provided on one side of the workbench close to the first elastic sheet, and a card ejection slot is provided on the reagent card transfer mechanism, and the card ejection slot corresponds to the position of the card slot.

5. The fluorescent immunoassay analyzer detection card ejection structure according to claim 4, characterized in that: The reagent card transfer mechanism is provided with a push bar block which can reciprocate along the card ejection slot.

6. A fluorescent immunoassay analyzer detection card ejection structure according to claim 5, characterized in that: A card ejection baffle is provided on a side of the workbench away from the reagent card transfer mechanism. The card ejection baffle is located on a side of the card slot away from the side plate, and a top of the card ejection baffle is flush with the card slot.

7. A fluorescent immunoassay analyzer detection card ejection structure according to claim 6, characterized in that: The support platform is provided with a slide groove for accommodating the card ejection baffle.

8. A fluorescent immunoassay analyzer detection card ejection structure according to any one of claims 4 to 7, characterized in that: The first support plate is connected to a driving device, and the driving device drives the first support plate to move relative to the second support plate. The movement direction of the first support plate is the width direction of the card slot.

9. A fluorescent immunoassay analyzer detection card ejection structure according to claim 8, characterized in that: The first support plate is provided with a sensing sheet, the workbench is provided with a first sensor, and the first sensor corresponds to the height position of the sensing sheet.

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