Tablet learning machine with turnover finger mirror

Abstract

The utility model discloses a tablet learning machine with a turnover finger mirror, and relates to the technical field of electronic products. The learning machine comprises a learning machine body, a base is arranged at the bottom of the learning machine body, a storage assembly is arranged on the inner side of the base, and a turnover supporting assembly is arranged on the inner side of the base. According to the utility model, through the arrangement of the storage assembly and the arrangement of convenient storage of the finger mirror main body, when the learning machine main body is stored, the phenomenon that the finger mirror main body is lost can be avoided, and meanwhile, the finger mirror main body can be protected; therefore, the finger mirror main body is prevented from being damaged by factors such as collision and extrusion when the finger mirror main body is stored and placed, and the service life of the finger mirror main body is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of electronic product technology, and in particular to a tablet learning machine with a flip-up learning mirror. Background Technology

[0002] A tablet learning device is a learning tool that integrates various educational resources and functions, aiming to provide students with a convenient and efficient learning experience.

[0003] When using a tablet learning device in daily life, it is often necessary to use a finger-guided learning mirror in conjunction with the tablet learning device. Students can use the finger-guided learning mirror to quickly look up the explanations of words and Chinese characters, or obtain the analysis of questions and explanations of knowledge points, so as to achieve instant feedback.

[0004] Because the finger-flipping learning mirror is small, it needs to be removed and stored separately when storing the tablet learning device, which can easily lead to loss and affect the subsequent use of the tablet learning device. At the same time, most tablet learning devices require a casing for support and heat dissipation, so a matching casing needs to be purchased separately according to the tablet learning device model, which reduces the convenience of the tablet learning device. Therefore, a tablet learning device with a flip-up finger-flipping learning mirror is needed to solve the technical problems mentioned in the above patent and provide a new technical solution. Utility Model Content

[0005] Based on this, a tablet learning machine with a flip-up finger-reading mirror is provided to solve the following technical problems mentioned in the background art: Due to the small size of the finger-reading mirror, it needs to be removed and stored separately when storing the tablet learning machine, which can easily lead to loss and affect the subsequent use of the tablet learning machine. At the same time, most tablet learning machines require a shell for support and heat dissipation, so it is necessary to purchase a matching shell according to the model of the tablet learning machine, which reduces the convenience of the tablet learning machine.

[0006] The present invention adopts the following technical solution:

[0007] The aforementioned tablet learning machine with a flip-up learning mirror specifically includes a learning machine body, a base at the bottom of the learning machine body, a storage component on the inner side of the base, and a flip-up support component on the inner side of the base.

[0008] Furthermore, the storage component includes a hollow tube and a drive plate. A first movable groove is provided in the middle of one side of the base. A second movable groove is provided at one end of the base near the first movable groove. A third movable groove is provided at the other end of the base near the first movable groove. A hollow tube is fitted with the inner side of the second movable groove with a clearance. A drive plate is fixedly connected to one end of the hollow tube. The drive plate and the inner side of the second movable groove away from the center of the base are fitted with a clearance.

[0009] Furthermore, the storage assembly also includes a movable concave plate, a finger learning mirror body, and a first rotating seat. The movable concave plate is fitted with a gap inside the first movable groove. The finger learning mirror body is placed on the top of the movable concave plate. The two ends of the movable concave plate near the center of the base are fixedly connected to the first rotating seats, and the two first rotating seats are located near the center of the movable concave plate.

[0010] Furthermore, the storage assembly also includes a bidirectional screw, a second rotating seat, a flip linkage rod, and a gear. The bidirectional screw is rotatably connected to the side of the first movable groove away from the movable concave plate. The threads at both ends of the bidirectional screw are symmetrically arranged. The outer sides of both ends of the bidirectional screw are threadedly connected to the second rotating seat. The two second rotating seats are located at both ends of the two first rotating seats. A flip linkage rod is provided between the second rotating seat and the first rotating seat at the same end. The two ends of the flip linkage rod are rotatably connected to the second rotating seat and the first rotating seat, respectively. The end of the bidirectional screw near the third movable groove extends into the inner side of the third movable groove and is fixedly connected to the gear. The bidirectional screw is rotatably connected to the side wall of the third movable groove.

[0011] Furthermore, the storage assembly also includes a fixing block, a first fixing rod, a movable hollow block, a toothed plate, and a spring. A fixing block is fixedly connected to the inner side of the third movable slot, and the fixing block is located on the side closer to the gear. A first fixing rod is fixedly connected to the side of the fixing block away from the gear. The first fixing rod is clearance-fitted to the inner side of the hollow tube. A movable hollow block is slidably connected to the outer side of the first fixing rod, and the movable hollow block is located on the outer side of the first fixing rod away from the fixing block. The movable hollow block is slidably connected to the inner side of the third movable slot. A toothed plate is fixedly connected to the bottom of the movable hollow block near the fixing block, and the toothed plate is slidably connected to the bottom of the inner side of the third movable slot. The toothed plate is meshed with the gear. A spring is located on the outer side of the first fixing rod, between the fixing block and the movable hollow block, and both sides of the spring are fixedly connected to the fixing block and the movable hollow block, respectively.

[0012] Furthermore, the flipping support assembly includes a second fixed rod, a first flipping plate, a second flipping plate, a third fixed rod, and a third flipping plate. Both ends of the top of the base have first reserved slots, and the top of the base away from the first movable slot has a second reserved slot. Both ends of the second reserved slot are connected to the first reserved slot. A second fixed rod is fixedly connected to the inner side of the first reserved slot near the first movable slot. A first flipping plate is rotatably connected to the outer side of the second fixed rod. The first flipping plate and the first reserved slot are clearance-fitted. The two first flipping plates are positioned between the sides away from the second fixed rod. A second flip plate is fixedly connected, and the second flip plate and the second reserved slot are configured with a clearance fit. The tops of both the first flip plate and the second flip plate are fixedly connected to the bottom of the learning machine body. The bottom of the first flip plate is provided with a third reserved slot. A third fixed rod is fixedly connected to the side of the third reserved slot away from the second fixed rod. The third flip plate is rotatably connected to the outside of the third fixed rod. The third flip plate and the third reserved slot are configured with a clearance fit. The bottom of the first reserved slot is provided with multiple limiting slots, and the bottom of the third flip plate is configured with an insertion limiting fit with the limiting slots.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This utility model provides a tablet learning machine with a flip-up learning mirror. By designing a convenient way to store the learning mirror, it can prevent the learning mirror from being lost when storing the main body of the learning machine. At the same time, it can also protect the learning mirror from damage caused by bumps, squeezing or other factors during storage, thereby extending the service life of the learning mirror.

[0015] This utility model provides a tablet learning machine with a flip-up learning mirror. By providing convenient support for the main body of the learning machine, it avoids the need for users to purchase a matching shell according to the model of the learning machine, thereby improving the convenience of using the learning machine. At the same time, the main body of the learning machine can be flipped to different angles as needed, which further enhances the convenience of using the learning machine. Attached Figure Description

[0016] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of a tablet learning machine with a flip-up finger mirror provided by this utility model;

[0018] Figure 2 A schematic diagram of the structure of a tablet learning machine base with a flip-up finger learning mirror provided by this utility model;

[0019] Figure 3 A schematic diagram of the structure of a tablet learning machine storage component with a flip-up learning mirror provided by this utility model;

[0020] Figure 4 A schematic diagram of the main body of the finger-learning mirror of a tablet learning machine with a flip-up finger-learning mirror provided by this utility model;

[0021] Figure 5 A schematic diagram of the bidirectional screw of a tablet learning machine with a flip-up finger learning mirror provided by this utility model;

[0022] Figure 6 A schematic diagram of the structure of a toothed plate for a flat learning machine with a flip-up finger mirror provided by this utility model;

[0023] Figure 7 A schematic diagram of the structure of a tablet learning machine storage component with a flip-up learning mirror provided by this utility model during use;

[0024] Figure 8 A schematic diagram of the structure of the first flip plate of a tablet learning machine with a flip-type finger learning mirror provided by this utility model;

[0025] Figure 9 A schematic diagram of the structure of the third flip plate of a tablet learning machine with a flip-type finger learning mirror provided by this utility model;

[0026] Figure 10 This is a schematic diagram of the structure of a flip support assembly for a tablet learning machine with a flip-up finger mirror, provided by this utility model, during use.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Learning machine main body; 2. Base; 3. Storage component; 4. Flip support component; 5. Hollow tube; 6. Drive plate; 7. Movable concave plate; 8. Finger mirror main body; 9. First rotating seat; 10. Bidirectional screw; 11. Second rotating seat; 12. Flip linkage rod; 13. Gear; 14. Fixing block; 15. First fixing rod; 16. Movable hollow block; 17. Gear plate; 18. Spring; 19. Second fixing rod; 20. First flip plate; 21. Second flip plate; 22. Third fixing rod; 23. Third flip plate. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 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 should fall within the protection scope of the present invention.

[0030] As mentioned in the background section, due to the small size of the touch screen, it needs to be removed and stored separately when storing the tablet learning device, which can easily lead to loss and affect the subsequent use of the tablet learning device. Furthermore, most tablet learning devices require a protective casing for support and heat dissipation, necessitating the purchase of a matching casing according to the tablet learning device model, thus reducing its convenience.

[0031] To solve this technical problem, this utility model provides a tablet learning machine with a flip-up learning mirror. By designing a convenient storage mechanism for the learning mirror body 8, the loss of the learning mirror body 8 can be avoided when storing the learning machine body 1. At the same time, it can also protect the learning mirror body 8, thereby preventing damage to the learning mirror body 8 from bumps, squeezes, or other factors during storage, and thus extending the service life of the learning mirror body 8.

[0032] For details, please refer to Figures 1-2 A tablet learning machine with a flip-up learning mirror specifically includes a learning machine body 1, a base 2 at the bottom of the learning machine body 1, a storage component 3 on the inner side of the base 2, and a flip support component 4 on the inner side of the base 2.

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0034] Example 1:

[0035] Please refer to Figures 1-2 A tablet learning machine with a flip-up learning mirror includes a learning machine body 1, a base 2 at the bottom of the learning machine body 1, a storage component 3 inside the base 2, and a flip support component 4 inside the base 2.

[0036] When the main body 1 of the learning machine is in use, the setting of the flip support component 4 can support the main body 1 of the learning machine, thereby improving the ease of use of the main body 1 of the learning machine and also improving the heat dissipation effect of the main body 1 of the learning machine.

[0037] When the main body 1 of the learning machine is not in use, the main body 8 of the learning mirror can be stored by the storage component 3, which can prevent the main body 8 of the learning machine from being lost when the main body 1 of the learning machine is stored. At the same time, it can also protect the main body 8 of the learning mirror from being damaged by external forces such as squeezing and bumping when stored.

[0038] Example 2:

[0039] This embodiment 2 further discloses the specific structure of the storage component 3 based on the above embodiments. By combining the storage component 3 with the structure in the above embodiments, the design of conveniently storing the learning mirror body 8 can be achieved. This can prevent the learning mirror body 8 from being lost when storing the learning machine body 1, and can also protect the learning mirror body 8, thereby preventing damage to the learning mirror body 8 from factors such as bumps and squeezing during storage, and thus improving the service life of the learning mirror body 8.

[0040] The tablet learning machine with a flip-type finger learning mirror provided in Example 1 is further optimized, specifically, as follows: Figures 3-7 As shown, the storage component 3 includes a hollow tube 5 and a drive plate 6. A first movable groove is provided in the middle of one side of the base 2. A second movable groove is provided at one end of the base 2 near the first movable groove. A third movable groove is provided at the other end of the base 2 near the first movable groove. The hollow tube 5 is fitted with the inner side of the second movable groove with a clearance. The drive plate 6 is fixedly connected to one end of the hollow tube 5. The drive plate 6 and the inner side of the second movable groove away from the center of the base 2 are fitted with a clearance.

[0041] The storage component 3 also includes a movable concave plate 7, a finger mirror body 8, and a first rotating seat 9. The movable concave plate 7 is fitted with a gap in the inner side of the first movable groove. The finger mirror body 8 is placed on the top of the movable concave plate 7. The two ends of the movable concave plate 7 near the center of the base 2 are fixedly connected to the first rotating seat 9, and the two first rotating seats 9 are located near the center of the movable concave plate 7.

[0042] The storage assembly 3 also includes a bidirectional screw 10, a second rotating seat 11, a flip linkage rod 12, and a gear 13. The bidirectional screw 10 is rotatably connected to the side of the first movable groove away from the movable concave plate 7. The threads at both ends of the bidirectional screw 10 are symmetrically arranged. The outer sides of both ends of the bidirectional screw 10 are threadedly connected to the second rotating seat 11. The two second rotating seats 11 are located at both ends of the two first rotating seats 9. A flip linkage rod 12 is provided between the second rotating seat 11 and the first rotating seat 9 at the same end. The two ends of the flip linkage rod 12 are rotatably connected to the second rotating seat 11 and the first rotating seat 9, respectively. The end of the bidirectional screw 10 near the third movable groove extends into the inner side of the third movable groove and is fixedly connected to the gear 13. The bidirectional screw 10 is rotatably connected to the side wall of the third movable groove.

[0043] The storage component 3 also includes a fixing block 14, a first fixing rod 15, a movable hollow block 16, a toothed plate 17, and a spring 18. The fixing block 14 is fixedly connected to the inner side of the third movable groove, and the fixing block 14 is positioned on the side closest to the gear 13. The first fixing rod 15 is fixedly connected to the side of the fixing block 14 away from the gear 13. The first fixing rod 15 is clearance-fitted with the inner side of the hollow tube 5. The movable hollow block 16 is slidably connected to the outer side of the first fixing rod 15, and the movable hollow block 16 is located on the side of the first fixing rod 15 away from the fixing block 18. On the outer side of one side, the movable hollow block 16 is slidably connected to the inner side of the third movable groove. The bottom of the movable hollow block 16 near the fixed block 14 is fixedly connected to a toothed plate 17, which is slidably connected to the bottom of the inner side of the third movable groove. The toothed plate 17 is meshed with the gear 13. A spring 18 is provided on the outer side of the first fixed rod 15. The spring 18 is located between the fixed block 14 and the movable hollow block 16, and both sides of the spring 18 are fixedly connected to the fixed block 14 and the movable hollow block 16, respectively.

[0044] Specifically: by moving the drive plate 6, the hollow tube 5, which is fixedly connected to the drive plate 6, can be pulled out of the inner side of the second movable slot, and then the hollow tube 5 is inserted into the inner side of the third movable slot, and a squeezing effect is generated on the movable hollow block 16.

[0045] Meanwhile, by setting the hollow tube 5 to be hollow and setting it to be in clearance fit with the first fixed rod 15, the movable hollow block 16 can be pushed to move closer to the fixed block 14. At this time, the movable hollow block 16 will drive the toothed plate 17 to move synchronously inside the third movable groove, and the movable hollow block 16 will also cause a squeezing effect on the spring 18.

[0046] Through the meshing connection of the toothed plate 17 with the top of the swivel gear 13, the toothed plate 17 can drive the gear 13 to rotate inside the third movable groove during the movement of the toothed plate 17, thereby driving the bidirectional screw 10 fixedly connected to the inside of the gear 13 to rotate synchronously.

[0047] By symmetrically setting the threads at both ends of the bidirectional screw 10, the two second rotating seats 11 on the outer sides of both ends of the bidirectional screw 10 can move synchronously and in opposite directions when the bidirectional screw 10 rotates.

[0048] When the bidirectional screw 10 drives the two second rotating seats 11 to move closer to each other, the linkage of the flip linkage rod 12 can push the first rotating seat 9 to move away from the bidirectional screw 10, thereby driving the movable concave plate 7 fixedly connected to the first rotating seat 9 to move out of the inner side of the first movable groove, so as to facilitate the removal of the finger learning lens body 8 placed on the top of the movable concave plate 7 or to place the finger learning lens body 8 on the top of the movable concave plate 7.

[0049] Then, the moving drive plate 6 moves the hollow tube 5 out of the third movable groove, so that the hollow tube 5 cancels the squeezing effect on the movable hollow block 16. At this time, the spring 18 can move the movable hollow block 16 away from the fixed block 14. At the same time, it can move the toothed plate 17, which is fixedly connected to the bottom of the movable hollow block 16, synchronously. Through the meshing connection between the toothed plate 17 and the gear 13, it can drive the bidirectional screw 10 to rotate in the opposite direction, thereby driving the two second rotating seats 11 to move away from each other. At the same time, through the flip linkage rod 12, it can drive the two first rotating seats 9 and the movable concave plate 7 to move synchronously to the inside of the third movable groove.

[0050] Example 3:

[0051] This embodiment 3 further discloses the specific structure of the flip support component 4 based on the above embodiments. By cooperating with the structure in the above embodiments, the flip support component 4 can achieve the effect of conveniently supporting the learning machine body 1, thereby avoiding the need for users to purchase a matching shell according to the model of the learning machine body 1, thus improving the convenience of using the learning machine body 1. At the same time, the learning machine body 1 can be flipped to different angles according to the needs of use, thereby further improving the convenience of using the learning machine body 1.

[0052] The tablet learning machine with a flip-type finger learning mirror provided in Embodiment 1 and Embodiment 2 has been further optimized, specifically, as follows: Figures 8-10As shown, the flip support assembly 4 includes a second fixed rod 19, a first flip plate 20, a second flip plate 21, a third fixed rod 22, and a third flip plate 23. Both ends of the top of the base 2 have first reserved slots, and the top of the base 2 away from the first movable slot has a second reserved slot. Both ends of the second reserved slot are connected to the first reserved slot. The second fixed rod 19 is fixedly connected to the inner side of the first reserved slot near the first movable slot. The first flip plate 20 is rotatably connected to the outer side of the second fixed rod 19. The first flip plate 20 and the first reserved slot are clearance-fitted. The two first flip plates 20 are located away from the second fixed rod 19. A second flip plate 21 is fixedly connected between the sides, and the second flip plate 21 and the second reserved slot are configured for clearance fit. The tops of both the first flip plate 20 and the second flip plate 21 are fixedly connected to the bottom of the learning machine body 1. The bottom of the first flip plate 20 is provided with a third reserved slot. A third fixed rod 22 is fixedly connected to the side of the third reserved slot away from the second fixed rod 19. A third flip plate 23 is rotatably connected to the outside of the third fixed rod 22. The third flip plate 23 and the third reserved slot are configured for clearance fit. The bottom of the first reserved slot is provided with multiple limiting slots, and the bottom of the third flip plate 23 is configured for insertion limiting fit with the limiting slots.

[0053] Specifically: When it is necessary to flip the main body 1 of the learning machine, the main body 1 of the learning machine can be flipped upwards directly. At this time, the main body 1 of the learning machine can drive the first flip plate 20 fixedly connected at the bottom to flip around the second fixed rod 19 as the center. At the same time, the third flip plate 23 is flipped out of the third reserved groove opened at the bottom of the first flip plate 20, and the bottom of the third flip plate 23 is moved to the top of the limiting groove.

[0054] Then, the main body 1 of the learning machine is flipped downwards. The linkage between the first flip plate 20 and the second flip plate 21 can drive the bottom of the third flip plate 23 to be inserted into the limiting groove, and fix the position of the first flip plate 20.

[0055] By forming different angles between the third flip plate 23 and the first flip plate 20, the angle between the first flip plate 20 and the base 2 can be adjusted, thereby adjusting the flip angle of the learning machine body 1, so that the learning machine body 1 can be adaptively adjusted according to the user's needs.

Claims

1. A tablet learning machine with a flip-type learning mirror, comprising a learning machine body (1), characterized in that, The learning machine body (1) has a base (2) at the bottom, a storage component (3) is provided on the inner side of the base (2), and a flip support component (4) is provided on the inner side of the base (2). The storage component (3) includes a hollow tube (5) and a drive plate (6). A first movable groove is provided in the middle of one side of the base (2). A second movable groove is provided at one end of the base (2) near the first movable groove. A third movable groove is provided at the other end of the base (2) near the first movable groove. The hollow tube (5) is fitted with the inner side of the second movable groove with a clearance. The drive plate (6) is fixedly connected to one end of the hollow tube (5). The drive plate (6) and the inner side of the second movable groove away from the center of the base (2) are fitted with a clearance. The flip support assembly (4) includes a second fixed rod (19), a first flip plate (20), a second flip plate (21), a third fixed rod (22), and a third flip plate (23). The top of the base (2) has first reserved slots at both ends. A second reserved slot is provided on the side of the top of the base (2) away from the first movable slot. Both ends of the second reserved slot are connected to the first reserved slot. A second fixed rod (19) is fixedly connected to the inner side of the first reserved slot near the first movable slot. A first flip plate (20) is rotatably connected to the outer side of the second fixed rod (19). The first flip plate (20) and the first reserved slot are clearance-fitted. The two first flip plates (20) are located on the side away from the second fixed rod (19). A second flip plate (21) is fixedly connected between the two parts. The second flip plate (21) and the second reserved slot are configured with a clearance fit. The top of the first flip plate (20) and the second flip plate (21) are fixedly connected to the bottom of the learning machine body (1). The bottom of the first flip plate (20) is provided with a third reserved slot. The side of the third reserved slot away from the second fixed rod (19) is fixedly connected with a third fixed rod (22). The outside of the third fixed rod (22) is rotatably connected with a third flip plate (23). The third flip plate (23) and the third reserved slot are configured with a clearance fit. The bottom of the first reserved slot is provided with multiple limiting slots. The bottom of the third flip plate (23) is configured with an insertion limiting fit with the limiting slot.

2. A tablet learning machine with a flip-up finger mirror according to claim 1, characterized in that, The storage component (3) also includes a movable concave plate (7), a finger learning mirror body (8), and a first rotating seat (9). The movable concave plate (7) is fitted with a gap in the inner side of the first movable groove. The finger learning mirror body (8) is placed on the top of the movable concave plate (7). The two ends of the movable concave plate (7) near the center of the base (2) are fixedly connected to the first rotating seat (9), and the two first rotating seats (9) are located near the center of the movable concave plate (7).

3. A tablet learning machine with a flip-up finger mirror according to claim 2, characterized in that, The storage component (3) also includes a bidirectional screw (10), a second rotating seat (11), a flip linkage rod (12), and a gear (13). The bidirectional screw (10) is rotatably connected to the side of the first movable groove away from the movable concave plate (7). The threads at both ends of the bidirectional screw (10) are symmetrically arranged. The outer sides of both ends of the bidirectional screw (10) are threadedly connected to the second rotating seat (11). The two second rotating seats (11) are located at both ends of the two first rotating seats (9). A flip linkage rod (12) is provided between the second rotating seat (11) and the first rotating seat (9) at the same end. The two ends of the flip linkage rod (12) are rotatably connected to the second rotating seat (11) and the first rotating seat (9), respectively. The end of the bidirectional screw (10) near the third movable groove extends to the inner side of the third movable groove and is fixedly connected to the gear (13). The bidirectional screw (10) is rotatably connected to the side wall of the third movable groove.

4. A tablet learning machine with a flip-up finger mirror according to claim 3, characterized in that, The storage component (3) further includes a fixing block (14), a first fixing rod (15), a movable hollow block (16), a toothed plate (17), and a spring (18). The fixing block (14) is fixedly connected to the inner side of the third movable groove, and the fixing block (14) is located on the side closer to the gear (13). The first fixing rod (15) is fixedly connected to the side of the fixing block (14) away from the gear (13). The first fixing rod (15) is clearance-fitted with the inner side of the hollow tube (5). The movable hollow block (16) is slidably connected to the outer side of the first fixing rod (15), and the movable hollow block (16) is located on the side of the first fixing rod (15) away from the fixing block (18). 14) On the outer side of one side, the movable hollow block (16) is slidably connected to the inner side of the third movable groove. The bottom of the movable hollow block (16) near the fixed block (14) is fixedly connected to a toothed plate (17), and the toothed plate (17) is slidably connected to the bottom of the inner side of the third movable groove. The toothed plate (17) is meshed with the gear (13). A spring (18) is provided on the outer side of the first fixed rod (15). The spring (18) is located between the fixed block (14) and the movable hollow block (16), and the two sides of the spring (18) are fixedly connected to the fixed block (14) and the movable hollow block (16) respectively.

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