Laminating device for large touch screen production

Abstract

The invention discloses a laminating device for large touch screen production, and relates to the technical field of touch screen laminating, the laminating device comprises a base, the middle of one side of the base is fixedly connected with a motor, the base is rotatably connected with two rotating plates, the two rotating plates are hinged to each other, an output shaft of the motor is fixedly connected with one rotating plate, and the output shaft of the motor is fixedly connected with the other rotating plate. Suction cup frames are arranged in the middle of the rotating plate, an air pipe is communicated between the two suction cup frames, and the suction cup frames are inflated and deflated through the air pipe. The self-adaptive adjustment of the elastic positioning pads is realized through the action that the front and back opposite elastic positioning pads are far away from and close to each other, so that the touch screen and the liquid crystal panel are quickly and accurately positioned on the rotating plate, and the consistency and accuracy of the positions of the touch screen and the liquid crystal panel are ensured; and the touch screen can be limited in the overturning process through the elastic positioning pad close to one side of the hinge shaft, so that the touch screen is prevented from moving downwards and deviating, and the laminating quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of touch screen lamination, and particularly to a lamination device for large touch screen production. Background Art

[0002] In the production of large touch screens, precisely combining the touch screen with the liquid crystal display panel to form a complete touch display module is one of the key processes in modern electronic device manufacturing, which requires ensuring high-precision alignment, no bubble residue, and uniform pressure distribution.

[0003] Since liquid crystal panels are usually relatively fragile, direct operation may cause damage. Inversion lamination can reduce the chance of directly operating the liquid crystal panel, reduce the risk, and can also more conveniently achieve high-precision alignment. Therefore, in the manufacture of display screens, especially for large display screens, traditional equipment mostly adopts the inversion lamination method. However, traditional inversion lamination equipment usually relies on suction cups to adsorb and fix the liquid crystal panel. This method requires prior alignment and placement before adsorption, with a cumbersome process and easy to make mistakes. Moreover, during the inversion operation, the material to be inverted (usually the touch screen) is prone to downward deviation due to gravity. Once the panel is accidentally moved during the operation, repositioning is required, which greatly reduces production efficiency and increases the risk of errors.

[0004] Based on the above situation, the present invention proposes a lamination device for large touch screen production. Summary of the Invention

[0005] In order to overcome the disadvantages that it is not easy to position before adsorption and pure reliance on adsorption may cause downward deviation due to gravity during the inversion process, the present invention provides a lamination device for large touch screen production.

[0006] A lamination device for large touch screen production includes a base. In the middle of one side of the base, a motor is fixedly connected. The base is rotatably connected with two rotating plates, and the two rotating plates are hinged to each other. The output shaft of the motor is fixedly connected to one of the rotating plates. A suction cup holder is arranged in the middle of the rotating plate. An air pipe is communicated between the two suction cup holders. The suction cup holder is inflated and evacuated through the air pipe. A fixed guide frame is fixedly connected to the bottom of the rotating plate. A guide plate is slidably connected to the fixed guide frame. The guide plate is provided with inclined grooves symmetrically distributed along the guide plate. A second spring is fixedly connected between the adjacent fixed guide frame and the guide plate. Two pull rods are slidably connected to the rotating plate. The pull rods are slidably connected to the adjacent inclined grooves. Elastic positioning pads are arranged on one side of the rotating plate close to the hinge axis and on the pull rods.

[0007] In a preferred embodiment of the present invention, the air pipe is communicated with the pipeline of a dual-purpose air pump for pumping and charging.

[0008] In a preferred embodiment of the present invention, it further includes sliding plates symmetrically distributed along one side of the rotating plate. The sliding plates are slidably connected to the rotating plate on one side. The rotating plate on one side is rotatably connected to magnetic guiding plates symmetrically distributed along this side of the rotating plate. The elastic positioning pads on the side close to the magnetic guiding plates are slidably connected to the pull rods thereon. The elastic positioning pads slidably connected to the pull rods are fixedly connected with extrusion blocks. The extrusion blocks are in extrusion cooperation with the adjacent magnetic guiding plates. The rotating plate on one side is fixedly connected with electromagnets symmetrically distributed along this side of the rotating plate. A third spring is fixedly connected between the sliding plate and the adjacent rotating plate.

[0009] In a preferred embodiment of the present invention, when powered on, the electromagnet and the adjacent magnetic guiding plate cooperate through repulsive magnetic force.

[0010] In a preferred embodiment of the present invention, one of the sucker frames is slidably connected to the rotating plate on the same side, and the base is provided with a protruding portion in contact with the sucker frame on this side. A first spring is fixedly connected between the sucker frame on this side and the rotating plate on this side.

[0011] In a preferred embodiment of the present invention, it further includes L-shaped sliding frames symmetrically distributed along one side of the sucker frame. The L-shaped sliding frames are slidably connected to the sucker frame on the same side. A tension spring is fixedly connected between the L-shaped sliding frames and the sucker frame on the same side. One of the sucker frames is fixedly connected with first magnetic blocks symmetrically distributed along this side of the sucker frame. The L-shaped sliding frames are magnetically attracted and matched with the adjacent first magnetic blocks. A push rod is slidably connected to one of the sucker frames. The adjacent L-shaped sliding frame and the push rod are in mutual extrusion cooperation.

[0012] In a preferred embodiment of the present invention, it further includes screws. The screws are threadedly connected to the fixed guide frame on one side. The screws are used to limit the adjacent guide plate.

[0013] In a preferred embodiment of the present invention, it further includes a magnetic rod. The magnetic rod is slidably connected to the fixed part of one of the elastic positioning pads close to the hinge shaft side. The magnetic rod is fixedly connected to the telescopic part of the elastic positioning pad. The fixed part of the elastic positioning pad is fixedly connected with a second magnetic block. The second magnetic block is slidably connected to the magnetic rod. The magnetic end of the magnetic rod is magnetically attracted and matched with the second magnetic block.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The present invention realizes adaptive adjustment of the elastic positioning pads by the movement of the front and rear relative elastic positioning pads moving away from and approaching each other, thereby quickly and accurately positioning the touch screen and the liquid crystal panel on the rotating plate to ensure the consistency and accuracy of the positions of the two. In addition, the elastic positioning pad close to one side of the hinge axis can limit the touch screen during the flipping process to prevent it from moving downward and out of position, thereby ensuring the quality of the fitting.

[0016] The present invention utilizes the electromagnet to be energized so that the magnetic guide plate drives the extrusion block to move, causing the elastic positioning pad to slide further to the left, and finally pushing the touch screen to be closely attached to the elastic positioning pad on the side close to the hinge shaft, thereby achieving the effect of auxiliary positioning of the magnetic guide plate and avoiding the situation where the touch screen does not fit the positioning pad.

[0017] The present invention utilizes the synergistic effect of the L-shaped slide and the magnetic attraction force, so that during the flipping and bonding process, the L-shaped slide is subjected to the combined effect of the negative pressure and the magnetic attraction force of the first magnetic block, thereby maintaining close contact with the rotating plate; when resetting, the L-shaped slide can be separated from the touch screen in advance under the action of the elastic force of the tension spring, thereby preventing the suction cup frame from taking away the bonded touch screen during resetting.

[0018] When the elastic positioning pads are compressed against each other, the elastic positioning pad telescopic part on the left rotating plate drives the magnetic rod to move downward and magnetically attract the second magnetic block, thereby preventing the touch screen from rebounding and moving when flipping.

[0019] The present invention limits the guide plate by pre-tightening the screws, and can loosen the pull rod when placing the touch screen and the liquid crystal panel without affecting the position of the elastic positioning pad, thereby simplifying the operation process and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the rotating plate, suction cup frame, air pipe and other components of the present invention.

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the fixed guide frame, the guide plate, the second spring and other components of the present invention.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the elastic positioning pad and the pull rod of the present invention.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the pull rod, the slide plate, the third spring and other components of the present invention.

[0025] Figure 6 It is a three-dimensional structural schematic diagram of the elastic positioning pad, the slide plate and other components of the present invention.

[0026] Figure 7Schematic three-dimensional structure diagram of components such as the L-shaped carriage, tension spring, and first magnet of the present invention.

[0027] Figure 8 Schematic three-dimensional structure diagram of components such as the tension spring, first magnet, and push rod of the present invention.

[0028] Figure 9 Schematic three-dimensional structure diagram of components such as the fixed guide frame, guide plate, and screw of the present invention.

[0029] Figure 10 Schematic three-dimensional structure diagram of components such as the base, rotating plate, and magnetic rod of the present invention.

[0030] Figure 11 Schematic three-dimensional structure diagram of components such as the elastic positioning pad, magnetic rod, and second magnet of the present invention.

[0031] In the figure: 1. Base, 2. Motor, 3. Rotating plate, 4. Suction cup holder, 5. Air pipe, 6. First spring, 7. Elastic positioning pad, 8. Fixed guide frame, 9. Guide plate, 10. Second spring, 11. Pull rod, 12. Slide plate, 121. Magnetic guide plate, 122. Extrusion block, 123. Electromagnet, 13. Third spring, 14. L-shaped carriage, 15. Tension spring, 16. First magnet, 17. Push rod, 18. Screw, 19. Magnetic rod, 20. Second magnet. Detailed implementation manners

[0032] Although the present invention may be described with respect to a particular application or industry, those skilled in the art will recognize the broader applicability of the present invention. Those of ordinary skill in the art will recognize that terms such as: above, below, upward, downward, etc. are used to describe the drawings and do not represent a limitation on the scope of the present invention defined by the appended claims. Any numerical labels such as: first or second are merely illustrative and are not intended to limit the scope of the present invention in any way.

[0033] Example 1: Example 1: A laminating device for large touch screen production, as Figures 1 - 4As shown in the figure, it includes a base 1. In the middle on the left side of the base 1, a motor 2 is fixedly connected. On the front and rear sides of the base 1, rotating plates 3 are rotatably connected. The two rotating plates 3 are hinged to each other. The output shaft of the motor 2 is fixedly connected to the front rotating plate 3. In the middle of the rotating plate 3, a suction cup holder 4 is provided. A trachea 5 is connected and communicated between the two suction cup holders 4. The trachea 5 is connected and communicated with the pipeline of a dual-purpose air pump for pumping and charging. The suction cup holder 4 is inflated and deflated through the trachea 5. At the bottom of the rotating plate 3, a fixed guide frame 8 is fixedly connected. The fixed guide frame 8 is slidably connected with a guide plate 9 in the up and down direction. The guide plate 9 is provided with inclined slots symmetrically distributed in the front and rear directions along the guide plate 9. A second spring 10 is fixedly connected between the adjacent fixed guide frame 8 and the guide plate 9. On the front and rear sides of the rotating plate 3, pull rods 11 are slidably connected. The inclined slots of the guide plate 9 are slidably connected with the adjacent pull rods 11. Elastic positioning pads 7 are provided on one side of the rotating plate 3 close to the hinge shaft and on the pull rods 11.

[0034] First, pull the two front pull rods 11 forward, squeeze the guide plate 9 to move upward, and the second spring 10 is compressed. The guide plate 9 pushes the rear pull rods 11 to move backward through the inclined slots. The pull rods 11 drive the respective elastic positioning pads 7 thereon to move in the same direction, so that the front and rear opposite elastic positioning pads 7 move away from each other. Then, place the touch screen and the liquid crystal panel with the optically transparent adhesive attached on the left and right rotating plates 3 respectively, and make the bottoms of the touch screen and the liquid crystal panel close to the suction cup holders 4 on the same side. At the same time, make the sides of the touch screen and the liquid crystal panel close to the hinge shaft contact the adjacent elastic positioning pads 7 respectively. Then release the pull rods 11, and the second spring 10 rebounds adaptively, making the guide plate 9 move downward, so that the two front pull rods 11 move backward, and the rear pull rods 11 move forward. The pull rods 11 drive the respective elastic positioning pads 7 thereon to move in the same direction, so that the front and rear opposite elastic positioning pads 7 move closer to each other until they contact and adhere tightly to the sides of the touch screen or the liquid crystal panel on the same side, thus quickly realizing the precise positioning before adsorption.

[0035] Then, control the dual-purpose air pump for pumping to evacuate the gas between the touch screen and the liquid crystal panel and the suction cup holder 4. Under the negative pressure, the touch screen and the liquid crystal panel are adsorbed on the suction cup holder 4. Then control the output shaft of the motor 2 to drive the left rotating plate 3 to flip. When the three elastic positioning pads 7 on the left flip to contact the corresponding three elastic positioning pads 7 on the right, the elastic positioning pads 7 are compressed to be coplanar with the screen on the same side, thereby attaching the touch screen to the liquid crystal display screen, thus realizing the attachment effect of the touch screen and obtaining a touch display module. And during the flipping process, the elastic positioning pads 7 on the side close to the hinge shaft can limit the touch screen to prevent the touch screen from moving downward and being displaced.

[0036] After the fitting is completed, control the air pump that can be used for both pumping and filling to inflate, and pull the two front pull rods 11 forward, so that the elastic positioning pads 7 facing each other front and back move away from each other to release the touch display module obtained by fitting. Then, control the output shaft of the motor 2 to drive the left rotating plate 3 to flip and reset. When the three elastic positioning pads 7 on the left flip to disengage from the corresponding three elastic positioning pads 7 on the right, the elastic positioning pads 7 reset. Finally, take away the touch display module, and place the next touch screen and liquid crystal display screen on the left and right rotating plates 3 respectively, and repeat the subsequent adsorption and flipping operations, etc., to batch perform the fitting operation of the large touch screen.

[0037] Embodiment 2: On the basis of Embodiment 1, as Figure 5 and Figure 6 shown, it further includes sliding plates 12 symmetrically distributed before and after along the left rotating plate 3. The sliding plates 12 are slidably connected to the left rotating plate 3. The left rotating plate 3 is rotatably connected with magnetic guiding plates 121 symmetrically distributed before and after along the left rotating plate 3. The elastic positioning pads 7 on the side close to the magnetic guiding plates 121 are slidably connected to the pull rods 11 thereon. A pressing block 122 is fixedly connected to the left side of the elastic positioning pads 7 slidably connected to the pull rods 11. The pressing block 122 is in pressing cooperation with the adjacent magnetic guiding plate 121. The left rotating plate 3 is fixedly connected with electromagnets 123 symmetrically distributed before and after along the left rotating plate 3. When energized, the electromagnets 123 cooperate with the adjacent magnetic guiding plates 121 through repulsive magnetic forces. A third spring 13 is fixedly connected between the sliding plates 12 and the adjacent rotating plates 3.

[0038] Before pulling the elastic positioning pads 7 on the front and back sides apart, first control the electromagnets 123 to be energized. Under the action of the repulsive magnetic force, the magnetic guiding plates 121 rotate to the side away from the adjacent electromagnets 123 until they contact the pressing blocks 122. Then, pull the two front pull rods 11 forward. The front and back pull rods 11 drive the elastic positioning pads 7 thereon to move outward, thereby driving the pressing blocks 122 to move outward. Under the guiding action of the magnetic guiding plates 121, the pressing blocks 122 also drive the elastic positioning pads 7 thereon to slide leftward relative to the pull rods 11, thereby squeezing the sliding plates 12 to slide leftward, and the third spring 13 is compressed. After the elastic positioning pads 7 are positioned to clamp the front and back sides of the touch screen, then control the electromagnets 123 to be powered off. The third spring 13 adaptively rebounds to drive the sliding plates 12 to move rightward. The sliding plates 12 push the adjacent elastic positioning pads 7 to slide rightward until they contact the left side of the touch screen, and push the touch screen to tightly adhere to the elastic positioning pads 7 close to the hinge axis on the right side to prevent the touch screen from not being adhered to this elastic positioning pad 7. During this process, the elastic positioning pads 7 sliding rightward will drive the pressing blocks 122 to move rightward, thereby pushing the magnetic guiding plates 121 to swing reversely and reset.

[0039] Embodiment 3: On the basis of Embodiment 2, as Figure 7 and Figure 8As shown in the figure, the suction cup holder 4 on the left is slidably connected to the rotating plate 3 on the left, and the base 1 is provided with a protruding portion that contacts the suction cup holder 4 on the left. Two first springs 6 are fixedly connected between the suction cup holder 4 on the left and the rotating plate 3 on the left. An L-shaped sliding frame 14 is slidably connected inside the suction cup holder 4 on the left and is symmetrically distributed in the front and back along the suction cup holder 4 on the left. A tension spring 15 is fixedly connected between the L-shaped sliding frame 14 and the suction cup holder 4 on the left. First magnets 16 are fixedly connected inside the suction cup holder 4 on the left and are symmetrically distributed in the front and back along the suction cup holder 4 on this side. The L-shaped sliding frame 14 is magnetically attracted and matched with the adjacent first magnets 16. A push rod 17 is slidably connected inside the suction cup holder 4 on the left in the up and down direction, and the adjacent L-shaped sliding frame 14 and the push rod 17 are mutually pressed and matched.

[0040] Initially, since the protruding portion of the base 1 abuts against the bottom of the suction cup holder 4 on the left, the suction cup holder 4 on the left is temporarily unable to slide relative to the rotating plate 3 on the left toward the side that compresses the first spring 6. At the same time, under the extrusion of the push rod 17, the L-shaped sliding frame 14 is in a state of stretching the tension spring 15. When the air between the suction cup holder 4 on the left and the touch screen is sucked out, negative pressure will start to act on the L-shaped sliding frame 14, causing the L-shaped sliding frame 14 to slide to be magnetically attracted to the adjacent first magnets 16, and the tension spring 15 is further stretched. At this time, the negative pressure and the magnetic attraction of the first magnets 16 jointly resist the action of the elastic force of the tension spring 15 on the L-shaped sliding frame 14. When inflation starts after flipping and fitting, since the magnetic attraction is less than the elastic force of the tension spring 15, the L-shaped sliding frame 14 slides toward the side that presses the adjacent push rod 17. At this time, since the suction cup holder 4 has already separated from the protruding portion of the base 1 during flipping, the push rod 17 can press the L-shaped sliding frame 14, causing the suction cup holder 4 on it to slide relative to the adjacent rotating plate 3 toward the side that compresses the first spring 6, so that the suction cup holder 4 is separated from the touch screen in advance before flipping and resetting, preventing the suction cup holder 4 from still having a certain suction force during flipping and resetting and taking away the successfully fitted touch screen.

[0041] Embodiment 4: On the basis of Embodiment 3, as Figure 9 shown, it further includes a screw 18. The screw 18 is threadedly connected to the lower part of the fixed guide 8 on the left, and the screw 18 is used to limit the adjacent guide plate 9.

[0042] Before placing the touch screen and the liquid crystal panel, the screw 18 is pre-tightened to limit the guide plate 9. In this way, when placing the touch screen and the liquid crystal panel, the pull rod 11 can be loosened without the elastic positioning pad 7 on the pull rod 11 being reset due to the reset of the second spring 10.

[0043] Embodiment 5: On the basis of Embodiment 4, as Figure 10 and Figure 11As shown, it also includes a magnetic rod 19, which is slidably connected to the fixed part of the elastic positioning pad 7 on the left side close to the hinge axis. The magnetic rod 19 is fixed to the telescopic part of the elastic positioning pad 7. The fixed part of the elastic positioning pad 7 is fixed with a second magnetic block 20. The second magnetic block 20 is slidably connected to the magnetic rod 19, and the magnetic end at the top of the magnetic rod 19 moves downward and is magnetically attracted to the second magnetic block 20.

[0044] When the elastic positioning pads 7 are compressed against each other, the telescopic portion of the elastic positioning pad 7 on the left rotating plate 3 near the hinge axis drives the magnetic rod 19 to move downward until it is magnetically attracted to the second magnetic block 20. In this way, when flipping, the elastic positioning pad 7 will not rebound and move the fitted touch screen. When the elastic positioning pad 7 drives the magnetic rod 19 and the second magnetic block 20 to flip and reset, the magnetic rod 19 slides upward and disengages from the second magnetic block 20 under the push of the base 1, so that the elastic positioning pad 7 can rebound and reset.

[0045] The above embodiments are provided for persons familiar with the art to implement or use the present invention. Personnel familiar with the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A laminating device for large touch screen production, characterized in that: The invention comprises a base (1), a motor (2) is fixedly connected in the middle of one side of the base (1), the base (1) is rotatably connected to two rotating plates (3), the two rotating plates (3) are hinged to each other, the output shaft of the motor (2) is fixedly connected to one of the rotating plates (3), a suction cup frame (4) is arranged in the middle of the rotating plate (3), an air pipe (5) is connected between the two suction cup frames (4), the suction cup frame (4) is inflated and exhausted through the air pipe (5), and the bottom of the rotating plate (3) is fixedly connected to the suction cup frame (4). A fixed guide frame (8) is connected, and the fixed guide frame (8) is slidably connected to a guide plate (9), and the guide plate (9) is provided with oblique grooves symmetrically distributed along the guide plate (9), and a second spring (10) is fixedly connected between adjacent fixed guide frames (8) and guide plates (9), and the rotating plate (3) is slidably connected to two pull rods (11), and the pull rods (11) are slidably connected to adjacent oblique grooves, and elastic positioning pads (7) are provided on one side of the rotating plate (3) close to the hinge axis and on the pull rod (11).

2. A laminating device for large touch screen production according to claim 1, characterized in that: The air pipe (5) is in communication with a pipeline of a dual-purpose air pump for pumping and charging.

3. A laminating device for large touch screen production according to claim 2, characterized in that: It also includes a slide plate (12) symmetrically distributed along the rotating plate (3) on one side, the slide plate (12) is slidably connected to the rotating plate (3) on one side, the rotating plate (3) on one side is rotatably connected to a magnetic guide plate (121) symmetrically distributed along the rotating plate (3) on this side, the elastic positioning pad (7) close to the side of the magnetic guide plate (121) is slidably connected to the pull rod (11) thereon, the elastic positioning pad (7) slidably connected to the pull rod (11) is fixedly connected to an extrusion block (122), the extrusion block (122) is extruded and matched with the adjacent magnetic guide plate (121), the rotating plate (3) on one side is fixedly connected to an electromagnet (123) symmetrically distributed along the rotating plate (3) on this side, and a third spring (13) is fixedly connected between the slide plate (12) and the adjacent rotating plate (3).

4. A laminating device for large touch screen production according to claim 3, characterized in that: When powered on, the electromagnet (123) cooperates with the adjacent magnetic guide plate (121) through repulsive magnetic forces.

5. A laminating device for large touch screen production according to claim 4, characterized in that: The suction cup frame (4) on one side is slidably connected to the rotating plate (3) on the same side, and the base (1) is provided with a protrusion that contacts the suction cup frame (4) on this side, and a first spring (6) is fixedly connected between the suction cup frame (4) on this side and the rotating plate (3) on this side.

6. A laminating device for large touch screen production according to claim 5, characterized in that: It also includes an L-shaped slide (14) symmetrically distributed along the suction cup frame (4) on one side, the L-shaped slide (14) is slidably connected to the suction cup frame (4) on the same side, a tension spring (15) is fixedly connected between the L-shaped slide (14) and the suction cup frame (4) on the same side, the suction cup frame (4) on one side is fixedly connected to a first magnetic block (16) symmetrically distributed along the suction cup frame (4) on this side, the L-shaped slide (14) is magnetically matched with the adjacent first magnetic block (16), the suction cup frame (4) on one side is slidably connected to a push rod (17), and the adjacent L-shaped slides (14) and the push rods (17) are pressed and matched with each other.

7. A laminating device for large touch screen production according to claim 6, characterized in that: It also includes a screw (18), wherein the screw (18) is threadedly connected to the fixed guide frame (8) on one side, and the screw (18) is used to limit the position of the adjacent guide plate (9).

8. A laminating device for large touch screen production according to claim 7, characterized in that: It also includes a magnetic rod (19), the magnetic rod (19) is slidably connected to a fixed portion of one of the elastic positioning pads (7) close to the hinge axis, the magnetic rod (19) is fixedly connected to the telescopic portion of the elastic positioning pad (7), the fixed portion of the elastic positioning pad (7) is fixedly connected to a second magnetic block (20), the second magnetic block (20) is slidably connected to the magnetic rod (19), and the magnetic end of the magnetic rod (19) is magnetically matched with the second magnetic block (20).

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