A device for monitoring adverse drug reactions
By designing and combining components such as the container and the movable plate, the problem of the shaking of the container affecting the monitoring accuracy in adverse drug reaction monitoring was solved. This achieved stable movement of the container and dust protection, improving monitoring accuracy and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 张家口市药品监测评价中心
- Filing Date
- 2026-03-05
- Publication Date
- 2026-06-19
AI Technical Summary
When the existing adverse drug reaction monitoring device is used, the mixture of gastric fluid and drug is discharged into the container, and the container is easily shaken when the staff takes it out, which affects the monitoring accuracy.
A drug adverse reaction monitoring device was designed, which includes components such as a container, a discharge pipe, a moving plate, an electric push rod, a protective cover, and a monitor. Through the cooperation of the moving plate and the clamping block, the container is stably moved to the monitor for monitoring after the mixture is discharged, and the cover plate is used to shield it from external dust.
It improves the stability of the vessel movement, reduces the impact of external dust on the monitoring results, simplifies the operation process, and improves the monitoring accuracy.
Smart Images

Figure CN122238599A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of monitoring device technology, specifically to a drug adverse reaction monitoring device. Background Technology
[0002] Adverse drug reactions refer to harmful or unexpected reactions that occur when a qualified drug is used at the normal dosage and administration method, and are unrelated to the intended purpose of the medication. To ensure the safety of drug use, it is necessary to monitor adverse drug reactions.
[0003] A search revealed a Chinese patent with application number "CN202122467523.5", which is specifically a drug adverse reaction monitoring device. The device includes a housing and a dispensing box. The bottom of the housing has multiple outlet pipes connected to its inner cavity, each equipped with an electrically controlled valve. An alarm and a control panel are located on the front wall of the housing, with the control panel electrically connected to the electrically controlled valves and the alarm. The dispensing box is located at the bottom of the housing and is a hollow rectangular body with an open front wall.
[0004] The above method discharges the mixture of gastric juice and drug into a vessel through multiple outlet tubes, which facilitates the monitoring of the reaction between gastric juice and drug. However, during monitoring, the vessel needs to be removed and placed inside the monitoring equipment, which increases the workload of the staff. In addition, the vessel is easily shaken when the staff removes it, which affects the reaction environment of the vessel.
[0005] Therefore, the present invention proposes a drug adverse reaction monitoring device to solve the above-mentioned problems. Summary of the Invention
[0006] To address the shortcomings of existing technologies, this invention provides a drug adverse reaction monitoring device that solves the problem of monitoring accuracy being affected when stomach medications are mixed with other drugs and discharged into a container, and staff removing the container.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] A drug adverse reaction monitoring device includes a container, with upright plates fixedly connected to both the left and right sides of the container. A base plate is fixedly connected to the lower side of the upright plates. An inlet pipe is fixedly connected to the upper side of the container, and multiple outlet pipes are fixedly connected to the lower side of the container. Valves are provided on the outer side of the outlet pipes. A placement unit is provided on the upper side of the base plate, and a protective cover is fixedly connected to the upper side of the base plate. A top plate is fixedly connected to the upper side of the protective cover, and a monitor is fixedly connected to the upper side of the top plate. The placement unit includes a chute located on the upper side of the base plate. A sliding plate is slidably connected to the inner side of the chute, and a movable plate is fixedly connected to the upper side of the sliding plate. Multiple containers are placed on the upper side of the movable plate.
[0009] Preferably, a top block is fixedly connected to the right side of the movable plate, a side block is fixedly connected to the right side of the bottom plate, an electric push rod is fixedly connected between the side block and the top block, two guide plates are fixedly connected to the upper side of the movable plate, two guide blocks are slidably connected to the outer side of the guide plates, a connecting plate is fixedly connected to the upper side of both guide blocks, a plurality of branch blocks are fixedly connected to the side of the connecting plate near the vessel, and a clamping block is fixedly connected to the outer side of the branch blocks.
[0010] Preferably, a vertical block is fixedly connected to the upper side of the movable plate, a fixed block is fixedly connected to the upper side of the vertical block, a rotating shaft is rotatably connected to the lower side of the fixed block, a turntable is fixedly connected to the lower end of the rotating shaft, two rotating blocks are fixedly connected to the outer side of the turntable, an inclined plate is rotatably connected to the lower side of the rotating block, the inclined plate is rotatably connected to the connecting plate, a motor for driving the rotating shaft is fixedly connected to the upper side of the fixed block, and the two inclined plates are arranged in parallel.
[0011] Preferably, multiple stabilizing blocks are fixedly connected to the upper side of the connecting plates on both sides. A rotating rod is rotatably connected to the outer side of the stabilizing block. A reinforcing plate is fixedly connected to the middle of the rotating rod. A control block is fixedly connected to the outer end of the rotating rod. Two inclined plates are rotatably connected to the outer side of the control block. A connecting block is rotatably connected between the two inclined plates. The connecting block is fixedly connected to the moving plate.
[0012] Preferably, the upper side of the vessel is provided with two cover plates, and an L-shaped plate is fixedly connected to the upper side of each of the two cover plates. A linkage block is fixedly connected to the outer side of each of the two connecting plates. An L-shaped block is fixedly connected to the outer side of each linkage block. An auxiliary plate is fixedly connected to the outer side of each L-shaped block. A second sliding groove is provided on the upper side of the auxiliary plate. A slider is slidably connected to the inner side of the second sliding groove. The slider is fixedly connected to the L-shaped plate.
[0013] Preferably, a screw is rotatably connected to the inner side of the sliding grooves on both the front and rear sides. The screw is threadedly connected to the slider. A gear is fixedly connected to the outer end of the screw. Mounting blocks are fixedly connected to the inner walls of the front and rear sides of the protective cover. A toothed plate that meshes with the gear is fixedly connected to the outer side of the mounting block. The spiral directions of the screws on the front and rear sides are opposite.
[0014] Preferably, the front side of the protective cover is provided with a sealing unit, the sealing unit includes a slide rail, the slide rail is fixedly connected to the front side of the protective cover, and the inner side of the slide rail is provided with a sealing plate.
[0015] Preferably, the front side of the movable plate is provided with an installation groove, the inner side of the installation groove is fixedly connected to a toothed plate two, the upper side of the base plate is rotatably connected to a control rod, the outer side of the control rod is fixedly connected to a gear two and a gear three, the rear side of the closed plate is provided with a rectangular groove, the inner side of the rectangular groove is fixedly connected to a toothed plate three, the toothed plate three is meshed with a gear two, and the toothed plate two is meshed with a gear three.
[0016] This invention provides a drug adverse reaction monitoring device. Compared with the prior art, it has the following advantages:
[0017] (1) The adverse drug reaction monitoring device is equipped with a container, a discharge pipe, a bottom plate, a moving plate and a container, which facilitates the holding of gastric juice and drug mixture in the container. The moving plate, electric push rod, protective cover, monitor, guide plate, connecting plate and clamp block facilitate the control of the container to move to the monitor for monitoring after discharge, which improves the stability of the container movement and makes the operation simple.
[0018] (2) The adverse drug reaction monitoring device is equipped with a connecting plate, a reinforcing plate, a stabilizing block, a rotating rod, an inclined plate and a connecting block. When the clamping block limits the container, the reinforcing plates on the front and back sides limit the container again, which further improves the stability of the container movement.
[0019] (3) The adverse drug reaction monitoring device is equipped with a cover plate, an L-shaped plate, a screw, a gear, and a toothed plate. After the gastric fluid drug mixture is discharged, the container is covered by the cover plate to avoid external dust affecting the monitoring results. The cover plate is opened during monitoring. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0021] Figure 2 This is a partial three-dimensional structural diagram of the present invention;
[0022] Figure 3 This is a three-dimensional structural diagram of the placement unit in this invention;
[0023] Figure 4 for Figure 3 Enlarged view of point A in the middle;
[0024] Figure 5 for Figure 3 Enlarged view of point B in the middle;
[0025] Figure 6 This is a three-dimensional structural diagram of the cover plate in this invention;
[0026] Figure 7 for Figure 6 Enlarged view of point C in the middle;
[0027] Figure 8 This is a three-dimensional structural diagram of the closed unit in this invention;
[0028] Figure 9 for Figure 8 Enlarged view of point D in the middle.
[0029] In the diagram: 1. Holding tank; 2. Inlet pipe; 3. Vertical plate; 4. Bottom plate; 5. Placement unit; 6. Top plate; 7. Monitor; 8. Protective cover; 9. Sealing unit; 10. Discharge pipe; 11. Valve; 51. Slide 1; 52. Slide plate; 53. Moving plate; 54. Container; 55. Top block; 56. Electric push rod; 57. Side block; 58. Mounting block; 59. Toothed plate 1; 510. Guide plate; 511. Guide block; 512. Connecting plate; 514. Branch block; 515. Clamping block; 516. Mounting groove; 517. Toothed plate 2; 518. Vertical block; 519. Fixing block; 5 20. Motor; 521. Shaft; 522. Turntable; 523. Rotating block; 524. Inclined plate one; 525. Stabilizing block; 526. Rotating rod; 527. Reinforcing plate; 528. Control block; 529. Inclined plate two; 530. Connecting block; 531. Cover plate; 532. L-shaped plate; 533. Auxiliary plate; 534. Slide groove two; 535. Slider; 536. Screw; 537. Gear one; 538. L-shaped block; 539. Linkage block; 91. Slide rail; 92. Enclosed plate; 93. Rectangular groove; 94. Gear plate three; 95. Control rod; 96. Gear two; 97. Gear three. Detailed Implementation
[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0031] This invention provides the following technical solutions:
[0032] Example 1
[0033] Please see Figures 1-7A drug adverse reaction monitoring device includes a container 1, with upright plates 3 fixedly connected to both the left and right sides of the container 1. A base plate 4 is fixedly connected to the lower side of the upright plates 3. An inlet pipe 2 is fixedly connected to the upper side of the container 1. Multiple outlet pipes 10 are fixedly connected to the lower side of the container 1, and valves 11 are installed on the outer side of the outlet pipes 10. A placement unit 5 is installed on the upper side of the base plate 4. A protective cover 8 is fixedly connected to the upper side of the base plate 4. A top plate 6 is fixedly connected to the upper side of the protective cover 8. A series of valves 11 are fixedly connected to the upper side of the top plate 6. The monitor 7 and the placement unit 5 include a chute 51, which is located on the upper side of the base plate 4. A slide plate 52 is slidably connected to the inner side of the chute 51. A movable plate 53 is fixedly connected to the upper side of the slide plate 52. Multiple containers 54 are arranged on the upper side of the movable plate 53. The mixture of gastric juice and medicine is poured into the holding box 1 through the inlet pipe 2. Then, the mixture is discharged into the container 54 through the outlet pipe 10 via the control valve 11. The monitor 7 is connected to a monitoring probe and uses optical means for monitoring.
[0034] A top block 55 is fixedly connected to the right side of the movable plate 53, and a side block 57 is fixedly connected to the right side of the base plate 4. An electric push rod 56 is fixedly connected between the side block 57 and the top block 55. Two guide plates 510 are fixedly connected to the upper side of the movable plate 53, and two guide blocks 511 are slidably connected to the outer side of the guide plates 510. A connecting plate 512 is fixedly connected to the upper side of both guide blocks 511. Multiple branch blocks 514 are fixedly connected to the side of the connecting plate 512 closest to the vessel 54. A clamping block 515 is fixedly connected to the outer side of the 4th plate. A vertical block 518 is fixedly connected to the upper side of the movable plate 53. A fixing block 519 is fixedly connected to the upper side of the vertical block 518. A rotating shaft 521 is rotatably connected to the lower side of the fixing block 519. A turntable 522 is fixedly connected to the lower end of the rotating shaft 521. Two rotating blocks 523 are fixedly connected to the outer side of the turntable 522. An inclined plate 524 is rotatably connected to the lower side of the rotating block 523. The inclined plate 524 is rotatably connected to the connecting plate 512. The fixing block 51... A motor 520, which drives the rotating shaft 521, is fixedly connected to the upper side of 9. The two inclined plates 524 are arranged in parallel. When the gastric juice and medicine mixture is discharged into the container 54, the motor 520 is started. The motor 520 drives the rotating shaft 521 to rotate, the rotating shaft 521 drives the turntable 522 to rotate, the turntable 522 drives the rotating block 523 to rotate, the rotating block 523 drives the inclined plate 524 to rotate, and the inclined plate 524 drives the connecting plate 512 to move. Because the two inclined plates 524 are arranged in parallel... The connecting plates 512 on the front and rear sides are brought closer together. The connecting plates 512 drive the branch blocks 514 to move, and the branch blocks 514 drive the clamping blocks 515 to move. The clamping blocks 515 on the front and rear sides limit the container 54, increasing the stability of the container 54 when it moves. During monitoring, the electric push rod 56 is controlled to drive the top block 55 to move to the left. The top block 55 drives the moving plate 53 to move to the left. The moving plate 53 drives the container 54 to move to the inside of the protective cover 8, which facilitates the monitoring of the mixture inside.
[0035] Multiple stabilizing blocks 525 are fixedly connected to the upper side of both connecting plates 512. A rotating rod 526 is rotatably connected to the outer side of each stabilizing block 525. A reinforcing plate 527 is fixedly connected to the middle of the rotating rod 526. A control block 528 is fixedly connected to the outer end of the rotating rod 526. Two inclined plates 529 are rotatably connected to the outer side of the control block 528. A connecting block 530 is rotatably connected between the two inclined plates 529. The connecting block 530 is fixedly connected to the moving plate 53. The clamping block 515 then clamps the vessel 54. When the device is in the limiting position, the connecting plate 512 drives the stabilizing block 525 to move. Under the action of the connecting block 530 and the inclined plate 529, the control block 528 rotates. The control block 528 drives the rotating rod 526 to rotate, and the rotating rod 526 drives the reinforcing plate 527 to rotate. Since the control blocks 528 on the front and rear sides are symmetrically distributed, the reinforcing plates 527 on the front and rear sides rotate towards the vessel 54, which makes it easier for the reinforcing plates 527 to limit the vessel 54 again, further improving the stability of the movement of the vessel 54.
[0036] The vessel 54 has two lids 531 on its upper side. An L-shaped plate 532 is fixedly connected to the upper side of each lid 531. A linkage block 539 is fixedly connected to the outer side of each connecting plate 512 on both sides. An L-shaped block 538 is fixedly connected to the outer side of each linkage block 539. An auxiliary plate 533 is fixedly connected to the outer side of each L-shaped block 538. A second sliding groove 534 is formed on the upper side of the auxiliary plate 533. A slider 535 is slidably connected to the inner side of the second sliding groove 534. The slider 535 and the L-shaped plate 532... Plate 532 is fixedly connected, and screws 536 are rotatably connected to the inner sides of the front and rear sliding grooves 534. Screws 536 are threadedly connected to sliders 535. Gear 537 is fixedly connected to the outer end of screw 536. Mounting blocks 58 are fixedly connected to the front and rear inner walls of the protective cover 8. Toothed plates 59 that mesh with gear 537 are fixedly connected to the outer side of mounting blocks 58. The spiral directions of the screws 536 on the front and rear sides are opposite. After the mixture is discharged, the connections on both sides are... When the connecting plates 512 move closer together, the connecting plate 512 drives the linkage block 539 to move, the linkage block 539 drives the L-shaped block 538 to move, the L-shaped block 538 drives the auxiliary plate 533 to move, and the auxiliary plate 533 drives the cover plate 531 on the L-shaped plate 532 to move, so that the cover plates 531 on the front and rear sides move closer together, making it easier for the cover plates 531 to cover the top of the container 54 and reduce the impact of dust on the monitoring of the mixture. When the container 54 moves into the interior of the protective cover 8, the gear 537 meshes with the toothed plate 59, and continues to control the movement of the moving plate 53, causing the gear 537 to rotate. The gear 537 drives the screw 536 to rotate, the screw 536 drives the slider 535 to move, the slider 535 drives the L-shaped plate 532 to move, and the L-shaped plate 532 drives the cover plate 531 to move. Since the screws 536 on both sides have opposite spiral directions, the cover plates 531 on both sides move further apart, making it easier for the cover plates 531 on both sides to open, and the monitor 7 to monitor.
[0037] Example 2
[0038] Based on Example 1, such as Figure 8 , Figure 9 As shown, a sealing unit 9 is provided on the front side of the protective cover 8. The sealing unit 9 includes a slide 91, which is fixedly connected to the front side of the protective cover 8. A sealing plate 92 is provided on the inner side of the slide 91. A mounting groove 516 is provided on the front side of the movable plate 53. A toothed plate 517 is fixedly connected to the inner side of the mounting groove 516. A control rod 95 is rotatably connected to the upper side of the base plate 4. A gear 96 and a gear 97 are fixedly connected to the outer side of the control rod 95. A rectangular groove 93 is provided on the rear side of the sealing plate 92. A toothed plate 94 is fixedly connected to the inner side of the rectangular groove 93. 94 meshes with gear 2 96, and gear plate 2 517 meshes with gear 3 97. During monitoring, moving plate 53 drives gear plate 2 517 to move, gear plate 2 517 drives gear 3 97 to rotate, gear 3 97 drives control lever 95 to rotate, control lever 95 drives gear 2 96 to rotate, and gear 2 96 drives gear plate 3 94 to move. Since gear plate 3 94 and gear plate 2 517 are symmetrically arranged, the moving plates 53 and closing plates 92 on both sides move in opposite directions, causing closing plate 92 to move to the right to block the front opening and protect the container 54.
[0039] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.
[0040] During operation, the mixture of gastric juice and medication is first poured into the inner side of the container 1 through the inlet pipe 2. Then, valve 11 is controlled to pour the mixture into the container 54. The motor 520 is then started, controlling the rotating shaft 521 to rotate. Under the action of the turntable 522, rotating block 523, and inclined plate 524, the connecting plates 512 on both sides move closer together. The connecting plates 512 drive the clamping blocks 515 on the branch block 514 to move, limiting the container 54. The electric push rod 56 is then controlled to move the moving plate 53, which moves the container 54 to the inner side of the protective cover 8. The monitoring device 7 then monitors the process. Before monitoring the mixture, the reinforcing plates 527 on both the front and rear sides limit the movement of the vessel 54 again under the action of the connecting block 530, inclined plate 529, control block 528 and rotating rod 526, further improving the stability of the movement of the vessel 54. At the same time, the connecting plate 512 drives the cover plate 531 to move. The cover plates 531 on both the front and rear sides shield the top of the vessel 54 to reduce the influence of external dust on the mixture. When the vessel 54 moves to the inside of the protective cover 8, the cover plate 531 is separated from the vessel 54 under the action of gear 537, toothed plate 59, screw 536 and slider 535, which facilitates the monitoring.
[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A drug adverse reaction monitoring device, comprising a container (1), characterized in that: The container (1) is fixedly connected to upright plates (3) on both the left and right sides. A bottom plate (4) is fixedly connected to the lower side of the upright plates (3). An inlet pipe (2) is fixedly connected to the upper side of the container (1). Multiple outlet pipes (10) are fixedly connected to the lower side of the container (1). A valve (11) is provided on the outside of the outlet pipe (10). A placement unit (5) is provided on the upper side of the bottom plate (4). A protective cover (8) is fixedly connected to the upper side of the bottom plate (4). The protective cover (8) is fixedly connected to a top plate (6), and a monitor (7) is fixedly connected to the top plate (6). The placement unit (5) includes a slide groove (51), which is opened on the upper side of the base plate (4). A slide plate (52) is slidably connected to the inner side of the slide groove (51). A movable plate (53) is fixedly connected to the upper side of the slide plate (52). Multiple containers (54) are arranged on the upper side of the movable plate (53).
2. The adverse drug reaction monitoring device according to claim 1, characterized in that: A top block (55) is fixedly connected to the right side of the movable plate (53), and a side block (57) is fixedly connected to the right side of the bottom plate (4). An electric push rod (56) is fixedly connected between the side block (57) and the top block (55). Two guide plates (510) are fixedly connected to the upper side of the movable plate (53). Two guide blocks (511) are slidably connected to the outer side of the guide plates (510). A connecting plate (512) is fixedly connected to the upper side of both guide blocks (511). Multiple branch blocks (514) are fixedly connected to the side of the connecting plate (512) near the vessel (54). A clamping block (515) is fixedly connected to the outer side of the branch blocks (514).
3. The adverse drug reaction monitoring device according to claim 2, characterized in that: A vertical block (518) is fixedly connected to the upper side of the movable plate (53), a fixed block (519) is fixedly connected to the upper side of the vertical block (518), a rotating shaft (521) is rotatably connected to the lower side of the fixed block (519), a turntable (522) is fixedly connected to the lower end of the rotating shaft (521), two rotating blocks (523) are fixedly connected to the outer side of the turntable (522), an inclined plate (524) is rotatably connected to the lower side of the rotating block (523), the inclined plate (524) is rotatably connected to the connecting plate (512), a motor (520) for driving the rotating shaft (521) to rotate is fixedly connected to the upper side of the fixed block (519), and the two inclined plates (524) are arranged in parallel.
4. The adverse drug reaction monitoring device according to claim 3, characterized in that: Multiple stabilizing blocks (525) are fixedly connected to the upper side of the connecting plates (512) on both sides. A rotating rod (526) is rotatably connected to the outer side of the stabilizing block (525). A reinforcing plate (527) is fixedly connected to the middle of the rotating rod (526). A control block (528) is fixedly connected to the outer end of the rotating rod (526). Two inclined plates (529) are rotatably connected to the outer side of the control block (528). A connecting block (530) is rotatably connected between the two inclined plates (529). The connecting block (530) is fixedly connected to the moving plate (53).
5. The adverse drug reaction monitoring device according to claim 4, characterized in that: The vessel (54) has two cover plates (531) on its upper side. An L-shaped plate (532) is fixedly connected to the upper side of each of the two cover plates (531). A linkage block (539) is fixedly connected to the outer side of each of the two connecting plates (512). An L-shaped block (538) is fixedly connected to the outer side of the linkage block (539). An auxiliary plate (533) is fixedly connected to the outer side of the L-shaped block (538). A second sliding groove (534) is provided on the upper side of the auxiliary plate (533). A slider (535) is slidably connected to the inner side of the second sliding groove (534). The slider (535) is fixedly connected to the L-shaped plate (532).
6. The adverse drug reaction monitoring device according to claim 5, characterized in that: Both sides of the sliding groove 2 (534) are rotatably connected to the inner side of the sliding groove 2 (534). The screw (536) is threadedly connected to the slider (535). The outer end of the screw (536) is fixedly connected to the gear 1 (537). The front and rear inner walls of the protective cover (8) are fixedly connected to the mounting block (58). The outer side of the mounting block (58) is fixedly connected to the toothed plate 1 (59) that meshes with the gear 1 (537). The spiral directions of the screw (536) on both sides are opposite.
7. The adverse drug reaction monitoring device according to claim 6, characterized in that: The protective cover (8) is provided with a sealing unit (9) on the front side. The sealing unit (9) includes a slide (91). The slide (91) is fixedly connected to the front side of the protective cover (8). A sealing plate (92) is provided on the inner side of the slide (91).
8. The adverse drug reaction monitoring device according to claim 7, characterized in that: The front side of the movable plate (53) is provided with an installation groove (516), and the inner side of the installation groove (516) is fixedly connected with a toothed plate (517). The upper side of the base plate (4) is rotatably connected with a control rod (95), and the outer side of the control rod (95) is fixedly connected with a gear (96) and a gear (97). The rear side of the closed plate (92) is provided with a rectangular groove (93), and the inner side of the rectangular groove (93) is fixedly connected with a toothed plate (94). The toothed plate (94) meshes with the gear (96), and the toothed plate (517) meshes with the gear (97).