Automatic disc changer

Abstract

The present invention discloses an automatic tray changing device, including a driving mechanism, a limiting mechanism, a height adjustment mechanism, a first support assembly, a second support assembly, a first material tray and a second material tray, wherein the first support assembly is used to carry the first material tray, the second support assembly is used to carry the second material tray, and the limiting mechanism is connected to the first support assembly; the driving mechanism connects the first support assembly and the second support assembly, and is configured to make the first support assembly and the second support assembly move toward each other; the height adjustment mechanism is installed on the first support assembly, and is configured to adjust the height of the first support assembly, so that the first support assembly moves along the limited direction of the limiting mechanism. The automatic tray changing device can automatically exchange the position of a tray with the tray in the loading area after packaging or testing in the working area is completed, without stopping the machine, and can achieve continuous production, which can not only improve efficiency, but also facilitate and safely take and change trays, and in addition, can greatly extend the service life of the equipment.

Description

Technical Field

[0001] The present invention relates to the field of automated mechanical equipment, and in particular to an automatic disc changing device. Background Art

[0002] In common stamping and CNC processing, when operating packaging, transfer or testing machines, operators need to wait for a tray to be packaged or tested before stopping the operation. Directly replacing a new tray in the operation area is inefficient, and the operation area of ​​common packaging or testing machines is not convenient for manual placement, and direct replacement brings safety hazards. In addition, after each operation, the machine needs to be stopped for material placement, and the tray must be placed and restarted. This operation is repeated, and the power on and off buttons are repeatedly pressed. Frequent power on and off of any electronic product is a serious loss to the equipment itself, and will also have a certain impact on the service life of the equipment itself, which will shorten the service life of the equipment in the long run. Summary of the invention

[0003] The object of the present invention is to provide an automatic disc changing device which does not require shutdown, has high efficiency, simple structure and long service life, and can at least solve one of the above problems.

[0004] According to one aspect of the present invention, there is provided an automatic tray changing device, comprising a driving mechanism, a limiting mechanism, a height adjustment mechanism, a first supporting assembly, a second supporting assembly, a first tray and a second tray, wherein the first supporting assembly is used to carry the first tray, the second supporting assembly is used to carry the second tray, and the limiting mechanism is connected to the first supporting assembly;

[0005] The driving mechanism connects the first supporting assembly and the second supporting assembly and is configured to move the first supporting assembly and the second supporting assembly toward each other;

[0006] The height adjustment mechanism is installed on the first support assembly and is configured to adjust the height of the first support assembly so that the first support assembly moves along the limited direction of the limiting mechanism.

[0007] Therefore, the working principle of the automatic disc changing device of the present invention is: in the initial position, the first support assembly and the second support assembly are located in the same horizontal plane. After starting to work, when the first material tray on the first support assembly is processed, the driving mechanism starts to work, and the height adjustment mechanism drives the first support assembly and the first material tray to first drop to a certain height, and then move toward the direction of the second support assembly according to the limited direction of the limiting mechanism. At the same time, the second support assembly and the second material tray move toward the direction of the first support assembly. After moving into place, the height adjustment mechanism drives the first support assembly and the first material tray to rise to the same height as the second support assembly, completing the automatic disc changing.

[0008] The automatic tray changing device of the present invention can automatically exchange the position of a tray with the tray in the loading area after packaging or testing in the working area is completed, without stopping the machine, and can achieve continuous production. It can not only improve efficiency but also facilitate and safely take out and change trays. In addition, it can also greatly extend the service life of the equipment.

[0009] In some embodiments, the automatic disc changing device further comprises a bottom plate and side plates, the side plates are mounted on both sides of the bottom plate, the driving mechanism is mounted on the bottom plate, the second support assembly is slidably mounted on the side plates, and the first support assembly is slidably mounted on the bottom plate via a height adjustment mechanism. Thus, when changing discs, the second support assembly slides on the side plates, and the first support assembly can be lowered to the bottom of the second support assembly under the action of the height adjustment mechanism, and staggered with the second support assembly, thereby ensuring smooth and safe disc changing.

[0010] In some embodiments, the limiting mechanism includes a limiting groove and a limiting column, the limiting groove is provided on the inner wall of the side plate, the limiting groove is provided along the length direction of the side plate, the limiting column is installed on the height adjustment mechanism and the two ends thereof are slidably matched with the limiting groove through rollers, and under the drive of the driving mechanism, the limiting column can move along the limiting groove, driving the height adjustment mechanism and the first support assembly installed on the height adjustment mechanism to move together. Thus, under the drive of the driving mechanism, the limiting column cooperates with the limiting groove, and can drive the first support assembly and the first material tray to move along the direction of the limiting groove, and the operation process is stable.

[0011] In some embodiments, the limiting groove is a V-shaped groove or a U-shaped groove with an opening facing upward, thereby ensuring that the first supporting assembly can move in both the height direction and the horizontal direction.

[0012] In some embodiments, the driving mechanism includes a driving member and a transmission belt, and the driving member can drive the transmission belt to rotate clockwise or counterclockwise. Thus, the driving member drives the transmission belt to rotate, driving the first support assembly and the second support assembly to move toward each other, and the belt drive runs smoothly with low noise.

[0013] In some embodiments, the second support assembly includes a second support plate and a second mounting block, the second support plate is used to carry the second material tray, two ends of the second mounting block are fixedly connected to the second support plate, and the other end is fixedly connected to the transmission belt of the driving mechanism. Thus, the rotation of the transmission belt drives the second mounting block to move, and then drives the second support plate and the second material tray mounted on the second support plate to move, thereby completing the tray replacement work.

[0014] In some embodiments, the first support assembly includes a first support plate, the first support plate is mounted on the height adjustment mechanism, and the first support plate is used to carry the first material tray, the height adjustment mechanism includes a mounting plate, a third slider, a third linear guide, a second mounting block and a movable table, the mounting plate can be slidably mounted on the bottom plate, the third linear guide is vertically mounted on the mounting plate, the first support plate and the limiting column are fixedly mounted on the movable table, the movable table is mounted on the third linear guide through the third slider, the third slider is slidably matched with the third linear guide, one end of the first mounting block is fixedly connected to the mounting plate, and the other end is fixedly connected to the transmission belt of the driving mechanism. Thus, the rotation of the transmission belt drives the first mounting block to move, drives the entire height adjustment mechanism to move, and then drives the first support plate installed on the height adjustment mechanism and the first material tray installed on the first support plate to move, and at the same time, the cooperation of the third slider and the third linear guide and the cooperation of the height adjustment mechanism and the limiting mechanism can realize the height adjustment of the first support plate, and complete the tray changing work.

[0015] In some embodiments, the automatic disc changing device further includes a first guide mechanism and a second guide mechanism, the first guide mechanism includes a first slider and a first linear guide rail, the first linear guide rail is mounted on the bottom plate, the first slider is mounted on the bottom of the mounting plate, and the first slider and the first linear guide rail are slidably matched; the second guide mechanism includes a second slider and a second linear guide rail, the second linear guide rail is mounted on the upper end of the side plate, the second slider is mounted on the bottom of the second support plate, and the second slider and the second linear guide rail are slidably matched. Thus, the arrangement of the first guide mechanism and the second guide mechanism can ensure the smooth operation of the first support assembly and the second support assembly in the horizontal direction, and has good stability; the first linear guide rail and the second linear guide rail can be double-row parallel slide rails to obtain a more stable support effect.

[0016] In some embodiments, the first support assembly further includes a first stopper, which is mounted on the first support plate and cooperates with the first material tray, and the second support assembly further includes a second stopper, which is mounted on the second support plate and cooperates with the second material tray. Thus, the provision of the first stopper and the second stopper can limit the position of the material tray, prevent the material tray from moving, and facilitate the positioning of the material tray during installation.

[0017] In some embodiments, the automatic disc changing device further includes a reset sensor, which is mounted on the bottom plate and electrically connected to the driving mechanism. There are two reset sensors, which are respectively arranged at the two ends of the bottom plate. A trigger matching the reset sensor is arranged on the height adjustment mechanism, and the reset sensor is triggered when the trigger moves from one reset sensor to another reset sensor. Thus, the setting of the reset sensor can control the driving mechanism to drive the first support assembly and the second support assembly to reciprocate, thereby realizing the cyclic operation of the disc changing work; at the same time, it can effectively prevent the stroke from exceeding the range, further improving the installation performance.

[0018] In some embodiments, the automatic disc changing device further includes a controller, and the controller is electrically connected to the driving mechanism.

[0019] Beneficial effects of the present invention:

[0020] The automatic tray changing device of the present invention can automatically exchange the position of a tray with the tray in the loading area after packaging or testing in the working area is completed, without stopping the machine, and can achieve continuous production. It can not only improve efficiency but also facilitate and safely take out and change trays. In addition, it can also greatly extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the automatic disc changing device using the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the automatic disc changing device shown in FIG.

[0023] Figure 3 for Figure 1 The three-dimensional structure diagram of the automatic disc changer shown is hidden behind one of the side panels;

[0024] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure of the automatic disk changing device behind the hidden structure shown;

[0025] Figure 5 for Figure 1 Schematic diagram of the exploded structure of the automatic disc changing device shown.

[0026] Figures 1 to 5 The figure marks in it are: 1-bottom plate; 2-side plate; 3-driving mechanism; 4-limiting mechanism; 5-height adjustment mechanism; 6-first supporting assembly; 7-second supporting assembly; 8-first material tray; 9-second material tray; 10-first guiding mechanism; 11-second guiding mechanism; 12-reset sensor; 13-trigger; 31-driving member; 32-transmission belt; 41-limiting groove; 42-limiting column; 43-roller; 51-mounting plate; 52-third slider; 53-third linear guide; 54-first mounting block; 55-movable table; 61-first support plate; 62-first limiting member; 71-second support plate; 72-second mounting block; 73-second limiting member; 101-first slider; 102-first linear guide; 111-second slider; 112-second linear guide. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] Figures 1 to 5An automatic disc changer according to an embodiment of the present invention is schematically shown.

[0029] like Figures 1 to 5 As shown, the automatic tray changing device includes a driving mechanism 3, a limiting mechanism 4, a height adjustment mechanism 5, a first supporting assembly 6, a second supporting assembly 7, a first tray 8 and a second tray 9. The first supporting assembly 6 is used to carry the first tray 8. The second supporting assembly 7 is used to carry the second tray 9. The limiting mechanism 4 is connected to the first supporting assembly 6.

[0030] The driving mechanism 3 connects the first supporting assembly 6 and the second supporting assembly 7 and is configured to move the first supporting assembly 6 and the second supporting assembly 7 toward each other.

[0031] The height adjustment mechanism 5 is installed on the first support assembly 6, and is configured to adjust the height of the first support assembly 6 so that the first support assembly 6 moves along the limited direction of the limiting mechanism 4. The two side panels 2 are installed on both sides of the bottom plate 1, and the driving mechanism 3 is installed on the bottom plate 1. The second support assembly 7 is slidably installed on the side panels 2, and the first support assembly 6 is slidably installed on the bottom plate 1 through the height adjustment mechanism 5. Therefore, when changing the disc, the second support assembly 7 slides on the side panels 2, and the first support assembly 6 can be lowered to the bottom of the second support assembly 7 under the action of the height adjustment mechanism 5, and staggered with the second support assembly 7, so as to ensure the smooth and safe progress of the disc changing work.

[0032] The limiting mechanism 4 of this embodiment includes a limiting groove 41 and a limiting column 42. The limiting groove 41 is provided on the inner wall of the side plate 2, and the limiting groove 41 is provided along the length direction of the side plate 2. The limiting column 42 is installed on the height adjustment mechanism 5, and the two ends thereof are slidably matched with the limiting groove 41 through rollers 43. Driven by the driving mechanism 3, the limiting column 42 can move along the limiting groove 41, driving the height adjustment mechanism 5 and the first support assembly 6 installed on the height adjustment mechanism 5 to move together. Therefore, driven by the driving mechanism 3, the limiting column 42 cooperates with the limiting groove 41, and can drive the first support assembly 6 and the first material tray 8 to move along the direction of the limiting groove 41, and the operation process is stable.

[0033] The limiting groove 41 may be a V-shaped groove or a U-shaped groove with the opening facing upward. Figure 4 As shown, the limiting groove 41 of this embodiment is a U-shaped groove with high ends and low middle part, and the two ends are S-shaped arc segments and the middle part is a straight segment. Thus, it can ensure that the first support assembly 6 can move in both the height direction and the horizontal direction.

[0034] The driving mechanism 3 includes a driving member 31, a synchronous wheel and a transmission belt 32. The synchronous wheel is sleeved on the driving end of the driving member 31, and the transmission belt 32 is sleeved on the synchronous wheel. The driving member 31 of this embodiment is a motor that can rotate forward and reverse, so that the driving member 31 can drive the transmission belt 32 to rotate clockwise or counterclockwise. Therefore, the driving member 31 drives the transmission belt 32 to rotate, driving the first support assembly 6 and the second support assembly 7 to move toward each other, and the belt drive runs smoothly with low noise.

[0035] like Figure 3 As shown, the second support assembly 7 includes a second support plate 71 and a second mounting block 72. The second support plate 71 is used to carry the second material tray 9. The two ends of the second mounting block 72 are fixedly connected to the second support plate 71, and the other end is fixedly connected to the upper end of the transmission belt 32 by fasteners such as bolts. The connection between the second mounting block 72 and the transmission belt 32 is located at one end of the transmission belt 32 close to the driving member 31. Therefore, the rotation of the transmission belt 32 drives the second mounting block 72 to move, and then drives the second support plate 71 and the second material tray 9 mounted on the second support plate 71 to move, completing the tray replacement work.

[0036] The first support assembly 6 includes a first support plate 61. The first support plate 61 is mounted on the height adjustment mechanism 5, and the first support plate 61 is used to carry the first material tray 8. The height adjustment mechanism 5 includes a mounting plate 51, a third slider 52, a third linear guide 53, a second mounting block 72 and a movable platform 55. The mounting plate 51 is slidably mounted on the bottom plate 1, and the third linear guide 53 is vertically mounted on the mounting plate 51. The first support plate 61 and the limiting column 42 are fixedly mounted on the movable platform 55. The movable platform 55 is mounted on the third linear guide 53 through the third slider 52, and the third slider 52 is slidably matched with the third linear guide 53. One end of the first mounting block 54 is fixedly connected to the mounting plate 51, and the other end is fixedly connected to the lower end of the transmission belt 32 through fasteners such as bolts. The connection between the first mounting block 54 and the transmission belt 32 is located at the end of the transmission belt 32 away from the driving member 31. Thus, the rotation of the transmission belt 32 drives the first mounting block 54 to move, drives the entire height adjustment mechanism 5 to move, and then drives the first support plate 61 installed on the height adjustment mechanism 5 and the first material tray 8 installed on the first support plate 61 to move. At the same time, the cooperation between the third slider 52 and the third linear guide rail 53 and the cooperation between the height adjustment mechanism 5 and the limiting mechanism 4 can realize the height adjustment of the first support plate 61 and complete the tray changing work.

[0037] The automatic disc changing device also includes a first guide mechanism 10 and a second guide mechanism 11. The first guide mechanism 10 includes a first slider 101 and a first linear guide 102. The first linear guide 102 is installed on the bottom plate 1, the first slider 101 is installed on the bottom of the mounting plate 51, and the first slider 101 and the first linear guide 102 are slidably matched. The second guide mechanism 11 includes a second slider 111 and a second linear guide 112, the second linear guide 112 is installed on the upper end of the side plate 2, the second slider 111 is installed on the bottom of the second support plate 71, and the second slider 111 and the second linear guide 112 are slidably matched. Therefore, the arrangement of the first guide mechanism 10 and the second guide mechanism 11 can ensure the smooth operation of the first support assembly 6 and the second support assembly 7 in the horizontal direction, and has good stability; the first linear guide 102 and the second linear guide 112 can be double-row parallel slide rails to obtain a more stable support effect.

[0038] The first support assembly 6 also includes a first limiter 62. The first limiter 62 is mounted on the first support plate 61 and cooperates with the first material tray 8. Since the first material tray 8 is a square tray, there are four first limiters 62 in this embodiment, all of which are fixedly mounted on the first support plate 61 by screws and other fasteners. When installing the first material tray 8, the first material tray 8 can be directly buckled on the outer periphery of the first limiter 62, which is convenient for disassembly and assembly. The second support assembly 7 also includes a second limiter 73. The second limiter 73 is mounted on the second support plate 71 and cooperates with the second material tray 9. The second limiter 73 is mounted on the second support plate 71 and cooperates with the second material tray 9. Since the second material tray 9 is a square tray, there are four second limiters 73 in this embodiment, all of which are fixedly mounted on the second support plate 71 by screws and other fasteners. When installing the second material tray 9, the second material tray 9 can be directly buckled on the outer periphery of the second limiter 73, which is convenient for disassembly and assembly. Therefore, the provision of the first limiting member 62 and the second limiting member 73 can limit the position of the material tray, prevent the material tray from moving, and facilitate the positioning of the material tray during installation.

[0039] The automatic disc changing device also includes a reset sensor 12, which is installed on the base plate 1 and electrically connected to the driving mechanism 3. There are two reset sensors 12, which are respectively arranged at the two ends of the base plate 1. A trigger member 13 matching the reset sensor 12 is arranged on the height adjustment mechanism 5, and the trigger member 13 is fixed to the bottom of the first mounting block 54 by fasteners such as screws. The reset sensor 12 of this embodiment can be a proximity switch. When the trigger member 13 moves from one reset sensor 12 to another reset sensor 12, the reset sensor 12 will be triggered, and then the driving member 31 will be controlled to rotate in the opposite direction to complete the reciprocating motion of the first support assembly 6 and the second support assembly 7. Therefore, the setting of the reset sensor 12 can play a role in controlling the driving mechanism 3 to drive the first support assembly 6 and the second support assembly 7 to reciprocate, so as to realize the cyclic operation of the disc changing work; at the same time, it can effectively prevent the stroke from exceeding the range, and further improve the installation performance.

[0040] The automatic disc changing device of this embodiment further comprises a controller. The controller is electrically connected to the driving member 31 of the driving mechanism 3 and is used to control the driving motor of the driving mechanism 3. The controller of this embodiment may be a PLC (Programmable Logic Controller).

[0041] The working principle of the automatic disc changing device of this embodiment is:

[0042] In the initial position, the first support assembly 6 and the second support assembly 7 are located in the same horizontal plane, and the trays containing the workpieces to be processed are placed on the first support assembly 6 and the second support assembly 7. After starting work, when the workpieces in the first tray 8 on the first support assembly 6 are processed, the driving member 31 starts to work, driving the transmission belt 32 to rotate counterclockwise, and the height adjustment mechanism 5 fixed to the transmission belt 32 through the first mounting block 54 drives the first support assembly 6 and the first tray 8 to first drop to a certain height, and then move toward the direction of the second support assembly 7 according to the limited direction of the limiting mechanism 4, and at the same time, the second support assembly 7 fixedly installed on the transmission belt 32 through the second mounting block 72 drives the second tray 9 to move toward the first support assembly 6. After the second support assembly 7 moves into place, the height adjustment mechanism 5 also drives the first support assembly 6 and the first tray 8 to rise along the limiting groove 41 to the same height as the second support assembly 7. At this time, the first automatic tray change is completed, and at this time, the first support assembly 6 can be directly unloaded, replaced, and other operations are performed without affecting the processing of the second tray 9 above the second support assembly 7.

[0043] The automatic tray changing device of the present invention can automatically exchange the position of a tray with the tray in the loading area after packaging or testing in the working area is completed, without stopping the machine, and can achieve continuous production. It can not only improve efficiency but also facilitate and safely take out and change trays. In addition, it can also greatly extend the service life of the equipment.

[0044] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. Automatic disc changing device, characterized in that: The invention comprises a bottom plate (1), a side plate (2), a driving mechanism (3), a limiting mechanism (4), a height adjustment mechanism (5), a first supporting assembly (6), a second supporting assembly (7), a first material tray (8) and a second material tray (9), wherein the first supporting assembly (6) is used for carrying the first material tray (8), the second supporting assembly (7) is used for carrying the second material tray (9), and the limiting mechanism (4) is connected to the first supporting assembly (6); The driving mechanism (3) connects the first supporting assembly (6) and the second supporting assembly (7), and is configured to move the first supporting assembly (6) and the second supporting assembly (7) toward each other; The height adjustment mechanism (5) is installed on the first support assembly (6) and is configured to adjust the height of the first support assembly (6) so that the first support assembly (6) moves along the limited direction of the limiting mechanism (4); The side panels (2) are mounted on both sides of the bottom panel (1), the driving mechanism (3) is mounted on the bottom panel (1), the second supporting assembly (7) is slidably mounted on the side panels (2), and the first supporting assembly (6) is slidably mounted on the bottom panel (1) via a height adjustment mechanism (5); The limiting mechanism (4) comprises a limiting groove (41) and a limiting column (42); the limiting groove (41) is formed on the inner wall of the side plate (2); the limiting groove (41) is formed along the length direction of the side plate (2); the limiting column (42) is mounted on the height adjustment mechanism (5) and two ends thereof are slidably matched with the limiting groove (41) through rollers (43); under the drive of the driving mechanism (3), the limiting column (42) can move along the limiting groove (41), thereby driving the height adjustment mechanism (5) and the first supporting assembly (6) mounted on the height adjustment mechanism (5) to move together; The limiting groove (41) is a V-shaped sliding groove or a U-shaped sliding groove with an opening facing upward; The driving mechanism (3) comprises a driving member (31) and a transmission belt (32); the driving member (31) is in transmission connection with the transmission belt (32) and can drive the transmission belt (32) to rotate clockwise or counterclockwise; The driving mechanism (3) comprises a driving member (31) and a transmission belt (32); the driving member (31) is in transmission connection with the transmission belt (32) and can drive the transmission belt (32) to rotate clockwise or counterclockwise.

2. The automatic disc changing device according to claim 1, characterized in that: The second supporting assembly (7) comprises a second supporting plate (71) and a second mounting block (72); the second supporting plate (71) is used to carry the second material tray (9); one end of the second mounting block (72) is fixedly connected to the second supporting plate (71), and the other end is fixedly connected to the transmission belt (32) of the driving mechanism (3).

3. The automatic disc changing device according to claim 2, characterized in that: The first supporting assembly (6) comprises a first supporting plate (61), the first supporting plate (61) is mounted on the height adjustment mechanism (5), and the first supporting plate (61) is used to carry the first material tray (8). The height adjustment mechanism (5) comprises a mounting plate (51), a third slider (52), a third linear guide rail (53), a first mounting block (54) and a movable platform (55). The mounting plate (51) is slidably mounted on the bottom plate (1), the third linear guide rail (53) is vertically mounted on the mounting plate (51), the first supporting plate (61) and the limiting column (42) are fixedly mounted on the movable platform (55), the movable platform (55) is mounted on the third linear guide rail (53) through the third slider (52), the third slider (52) and the third linear guide rail (53) are slidably matched, one end of the first mounting block (54) is fixedly connected to the mounting plate (51), and the other end is fixedly connected to the transmission belt (32) of the driving mechanism (3).

4. The automatic disc changing device according to claim 3, characterized in that: The invention also comprises a first guide mechanism (10) and a second guide mechanism (11), wherein the first guide mechanism (10) comprises a first slider (101) and a first linear guide rail (102), wherein the first linear guide rail (102) is mounted on the base plate (1), the first slider (101) is mounted on the bottom of the mounting plate (51), and the first slider (101) and the first linear guide rail (102) are slidably matched; the second guide mechanism (11) comprises a second slider (111) and a second linear guide rail (112), wherein the second linear guide rail (112) is mounted on the upper end of the side plate (2), the second slider (111) is mounted on the bottom of the second support plate (71), and the second slider (111) and the second linear guide rail (112) are slidably matched.

5. The automatic disc changing device according to claim 3 or 4, characterized in that: The first support assembly (6) further comprises a first position-limiting member (62), which is mounted on the first support plate (61) and cooperates with the first material tray (8), and the second support assembly (7) further comprises a second position-limiting member (73), which is mounted on the second support plate (71) and cooperates with the second material tray (9).

6. The automatic disc changing device according to any one of claims 1 to 5, characterized in that: The invention also comprises a reset sensor (12), wherein the reset sensor (12) is mounted on the base plate (1) and is electrically connected to the drive mechanism (3), wherein two reset sensors (12) are respectively arranged at two ends of the base plate (1), and a triggering member (13) matching the reset sensor (12) is arranged on the height adjustment mechanism (5), and when the triggering member (13) moves from one reset sensor (12) to another reset sensor (12), the reset sensor (12) is triggered.

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