A directional automatic stacking device for varistor chips

Abstract

The present invention discloses a device for directional automatic stacking of varistor chips, comprising a conveyor belt structure, a flow divider is arranged on the conveyor belt structure, a discharge end of the flow divider is connected to a feed end of a positioner, and the positioner is arranged obliquely; when the present invention is working, the varistor chips can be directional-transmitted in batches, so that the varistor chips are transmitted in a row, which is convenient for subsequent sorting, and the present invention takes into account that one end of the pin of the varistor chip is soft and sharp, which is easily deformed by force during the transmission process, and therefore the varistor chip with the pin facing forward is rotated 180 degrees, so that all the varistor chips are in a state where the varistor chip body faces forward during the subsequent transmission process, thereby realizing the positioning of the varistor and preventing the pin end of the varistor chip from being deformed by impact.

Description

Technical Field

[0001] The present invention belongs to the technical field of varistors, and in particular, relates to a device for automatically stacking varistor chips in a directional manner. Background Art

[0002] A varistor is a voltage-limiting protection device that can clamp the voltage to a relatively fixed voltage value, thereby protecting the subsequent circuit. After the varistor is produced, a wrapping layer needs to be set. In order to facilitate the setting of the wrapping layer, the produced varistors need to be arranged in rows to facilitate grabbing and positioning. After the wrapping layer has been set, the varistor chip needs to be neatly arranged for packaging.

[0003] The varistor chip includes a resistor body part and a pin part. The pin part of the varistor chip is generally slender. After a large number of varistor chips are mixed, automatic separation by a mechanical structure can easily cause damage to the pin part of the varistor chip. The separation process is mainly performed by manpower, which is inefficient. In order to solve the above problems, the present invention provides the following technical solutions. Summary of the invention

[0004] The purpose of the present invention is to provide a device for automatically stacking varistor chips in a directional manner, so as to solve the problems in the prior art that the efficiency of directional separation and stacking of varistor chips is low and mechanical separation is prone to damage to the varistor chips.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A directional automatic stacking device for varistor chips, comprising a conveyor belt structure, a flow divider is arranged on the conveyor belt structure, a discharge end of the flow divider is connected to a feed end of a positioner, and the positioner is arranged obliquely;

[0007] The flow divider comprises an upper cover plate, on one surface of which a plurality of parallel partition plates are fixedly mounted, a flow guide channel is formed between two adjacent partition plates, the width of the flow guide channel can only accommodate one varistor chip, and the flow divider can reciprocate in the horizontal direction perpendicular to the conveying direction of the conveyor belt structure;

[0008] The positioner includes a dispersion plate and a concentration plate, the dispersion plate includes a first receiving bottom plate, a plurality of guide grooves are arranged on the first receiving bottom plate, and the discharge ends of the plurality of guide grooves are far away from each other;

[0009] The centralizing plate comprises a second receiving bottom plate, on which a plurality of centralizing grooves are arranged, the centralizing grooves correspond to the guide grooves one by one, and the centralizing grooves are arranged to gradually reduce in width from the feeding end to the discharging end;

[0010] The positioner also includes a limiter and a positioning member arranged above the feeding end of the concentrating plate, and a rotating member is arranged below the feeding end of the concentrating plate;

[0011] When the limiting member is at the lowest point, the distance between the limiting member and the concentrated groove can pass through the pins of the varistor chip but cannot pass through the body of the varistor chip;

[0012] The positioning piece can press the pins of the varistor chip onto the rotating piece without affecting the rotation;

[0013] The rotating member can drive the varistor chip to rotate.

[0014] As a further solution of the present invention, a side baffle is provided on the conveyor belt structure, a combing roller is rotatably mounted on the side baffle, the combing roller is perpendicular to the conveying direction of the conveyor belt structure, and bristles are provided on the surface of the combing roller.

[0015] As a further solution of the present invention, a plurality of guide rods are fixedly installed on the outer side of the partition plates on both sides of the diverter, and the guide rods are slidably installed on the conveyor belt structure. Reinforcing plates are fixedly installed on the outer side of the partition plates on both sides of the diverter, and the guide rods are fixedly installed on the reinforcing plates.

[0016] As a further solution of the present invention, the surface of the partition plate is coated with a layer of rubber material.

[0017] As a further solution of the present invention, the diverter is driven by a reciprocating drive structure, which includes a turntable, a telescopic rod and a transmission rod. The turntable is driven to rotate by a motor, and a transmission connecting shaft is fixedly or rotatably installed on one side of the turntable at a non-central position;

[0018] One end of the transmission rod is correspondingly rotatably sleeved or fixedly sleeved on the transmission connecting shaft, and the other end of the transmission rod is hinged to one end of the telescopic rod. A limit sleeve is sleeved on the telescopic rod, and the limit sleeve is fixedly installed on the conveyor belt structure.

[0019] As a further solution of the present invention, the limiting member includes a first supporting cross bar, on which a plurality of limiting baffles are fixedly mounted, the limiting baffles correspond to the concentrated grooves one by one, and the limiting member can reciprocate in the vertical direction.

[0020] As a further solution of the present invention, the positioning member includes a second supporting cross bar, on which a plurality of mounting blocks are fixedly mounted, and on each mounting block a pressure rod is rotatably mounted, and the pressure rods correspond to the concentrated grooves one by one.

[0021] As a further solution of the present invention, the end of the pressure rod is coated with a layer of rubber material.

[0022] As a further solution of the present invention, the rotating member includes a strip mounting plate fixedly mounted on the bottom of the second receiving bottom plate, a plurality of rotating shafts are rotatably mounted on the strip mounting plate, a transmission gear and a rotating disk are fixedly sleeved on the rotating shaft, a through hole is provided on the second receiving bottom plate corresponding to the rotating disk, and correspondingly, a through hole is provided in each concentrated groove, a rotating disk is rotatably mounted in the through hole, and the upper surface of the rotating disk is on the same horizontal plane as the surface of the second receiving bottom plate;

[0023] A driving rack is slidably mounted on the strip-shaped mounting plate, and the driving rack is meshed with the transmission gear.

[0024] Beneficial effects of the present invention:

[0025] (1) When the present invention is working, it can carry out directional transmission of varistor chips in batches, so that the varistor chips are transmitted in rows, which is convenient for subsequent sorting.

[0026] (2) The present invention takes into account that one end of the pin of the varistor chip is soft and sharp and is easily deformed by force during transmission. Therefore, a positioner is designed to intercept the varistor chip and rotate the varistor chip with the pin facing forward by 180°, so that all varistor chips are always in a state where the varistor chip body faces forward during the subsequent transmission process. On the one hand, the positioning of the varistor is achieved to avoid the situation in which the varistor chip is in two states at the same time, one with the pin end facing forward and the other with the pin end facing backward during subsequent collection, which makes it impossible to achieve uniform positioning of the varistor chip. On the other hand, it can avoid the situation in which the pin end of the varistor chip is deformed by impact. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 1 It is a structural schematic diagram of a varistor chip directional automatic stacking device of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the shunt;

[0030] Figure 3 It is a schematic diagram of the structure of the locator;

[0031] Figure 4 It is a structural schematic diagram of the limiter;

[0032] Figure 5 It is a structural schematic diagram of the positioning member;

[0033] Figure 6 It is a schematic diagram of the structure of the rotating part;

[0034] Figure 7 It is a structural schematic diagram of a reciprocating drive structure;

[0035] In the figure: 1, conveyor belt structure; 2, side baffle; 3, diverter; 4, positioner; 5, rotating member; 6, guide arc groove; 7, soft baffle; 8, reciprocating drive structure; 21, combing roller; 31, upper cover plate; 32, partition plate; 33, guide channel; 34, reinforcement plate; 35, guide rod; 41, dispersion plate; 42, concentration plate; 411, first receiving bottom plate; 413, first guide rail baffle; 415, guide groove; 421, second guide rail Baffle; 422, centralizing groove; 423, second receiving bottom plate; 51, strip mounting plate; 52, driving rack; 53, rotating shaft; 54, transmission gear; 55, rotating disk; 81, rotating disk; 82, transmission connecting shaft; 83, transmission rod; 84, telescopic rod; 85, limiting sleeve; 91, limiting member; 92, positioning member; 911, first supporting cross bar; 912, limiting baffle; 921, second supporting cross bar; 922, mounting block; 923, pressure rod. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] A varistor chip directional automatic stacking device, such as Figures 1 to 7 As shown, it includes a conveyor belt structure 1, on which a side baffle 2 and a diverter 3 are arranged, the side baffle 2 is arranged at the feeding end of the conveyor belt structure 1, the diverter 3 is arranged at the discharging end of the conveyor belt structure 1, and the side baffle 2 is arranged on the other side of the conveyor belt structure 1, which can prevent the varistor chip entering the conveyor belt structure 1 from falling from the side of the conveyor belt structure 1, and play a material blocking effect, the discharging end of the diverter 3 is connected to the feeding end of the positioner 4, the positioner 4 is inclined, and the discharging end of the positioner 4 is connected to the feeding end of the guide arc groove 6;

[0038] The guiding arc groove 6 is designed as an arc structure, which can guide the varistor chip to smoothly decelerate and position;

[0039] Both sides of the feed end of the diverter 3 are connected to the side baffle 2 through soft baffles 7 to prevent the varistor chip from falling from the joint between the diverter 3 and the side baffle 2 during the movement of the diverter 3;

[0040] In one embodiment of the present invention, the soft baffle 7 is made of wear-resistant fiber cloth;

[0041] In one embodiment of the present invention, a combing roller 21 is rotatably mounted on the side baffle 2, the combing roller 21 is perpendicular to the conveying direction of the conveyor belt structure 1, and bristles are arranged on the surface of the combing roller 21. By rotating the combing roller 21, the varistor chip 1 on the conveyor belt structure 1 is laid into a layer;

[0042] Preferably, Figure 1 is a reference angle, and the rotation direction of the combing roller 21 is clockwise;

[0043] The flow divider 3 comprises an upper cover plate 31, on one surface of which a plurality of parallel partition plates 32 are fixedly mounted, a guide channel 33 is formed between two adjacent partition plates 32, and the width of the guide channel 33 can accommodate at most one varistor chip to pass through;

[0044] A plurality of guide rods 35 are fixedly installed on the outer sides of the partition plates 32 on both sides of the diverter 3, and support frames are provided on both sides of the conveyor belt structure 1. The guide rods 35 are slidably installed on the support frames on both sides of the conveyor belt structure 1. The diverter 3 can be driven by the reciprocating drive structure 8 to reciprocate in the horizontal direction along the direction perpendicular to the conveying direction of the conveyor belt structure 1;

[0045] The distance between the partition plate 32 on the flow divider 3 and the conveyor body on the conveyor structure 1 is small, which is not enough to allow the varistor chip to enter the adjacent flow guide channel 33 from one flow guide channel 33;

[0046] In one embodiment of the present invention, reinforcing plates 34 are fixedly mounted on the outer sides of the partition plates 32 on both sides of the diverter 3, and the guide rods 35 are fixedly mounted on the reinforcing plates 34. The arrangement of the reinforcing plates 34 can improve the structural strength of the connection, thereby preventing deformation of the connection between the guide rods 35 and the partition plates 32 during long-term operation.

[0047] In one embodiment of the present invention, the surface of the partition plate 32 is coated with a layer of rubber material, which has a buffering and silencing effect and reduces the collision strength of the varistor chip during the diversion process;

[0048] In one embodiment of the present invention, the reciprocating drive structure 8 includes a turntable 81, a telescopic rod 84 and a transmission rod 83. The turntable 81 is driven to rotate by a motor, and a transmission connection shaft 82 is fixedly or rotatably installed on one side of the turntable 81 at a non-central position;

[0049] One end of the transmission rod 83 is correspondingly rotatably sleeved or fixedly sleeved on the transmission connection shaft 82, and the other end of the transmission rod 83 is hinged to one end of the telescopic rod 84, and the telescopic rod 84 is sleeved with a limit sleeve 85, and the limit sleeve 85 is fixedly installed on the conveyor belt structure 1;

[0050] When working, the motor drives the turntable 81 to rotate, thereby driving the telescopic rod 84 to reciprocate in the horizontal direction, thereby driving the diverter 3 to reciprocate in the horizontal direction;

[0051] The positioner 4 includes a dispersion plate 41 and a concentration plate 42. The dispersion plate 41 includes a first receiving bottom plate 411. The first receiving bottom plate 411 is provided with a plurality of guide grooves 415. The guide grooves 415 are composed of two first guide rail baffles 413 fixedly mounted on the first receiving bottom plate 411. The width of the guide grooves 415 can accommodate at most one varistor chip flowing through. There is a certain angle between two adjacent guide grooves 415. Specifically, the feed ends of the plurality of guide grooves 415 are compactly arranged, and the discharge ends of the plurality of guide grooves 415 are far away from each other.

[0052] It should be noted that the feed ends of the plurality of guide grooves 415 in the dispersion plate 41 correspond to the plurality of guide channels 33 one by one. Specifically, the end of the partition plate 32 on the discharge side of the guide channel 33 is connected to the end of the first guide rail baffle 413 on the feed side of the guide groove 415 through the soft baffle 7.

[0053] The centralizing plate 42 includes a second receiving bottom plate 423, on which a plurality of centralizing grooves 422 are arranged. The centralizing grooves 422 are composed of two second guide rail baffles 421 fixedly mounted on the second receiving bottom plate 423. The centralizing grooves 422 correspond to the guide grooves 415 one by one, and the centralizing grooves 422 are arranged so that the width gradually decreases from the feeding end to the discharging end.

[0054] The concentrated groove 422 with a gradually decreasing width can orient the varistor chip that has completed the turning;

[0055] The positioner 4 further includes a stopper 91 and a positioning member 92 disposed above the feeding end of the concentrating plate 42, and a rotating member 5 is disposed below the feeding end of the concentrating plate 42;

[0056] The limiting member 91 includes a first supporting cross bar 911, on which a plurality of limiting baffles 912 are fixedly mounted, and the limiting baffles 912 correspond to the concentrated grooves 422 one by one. The limiting member 91 can be driven to reciprocate in the vertical direction. When the limiting member 91 is at the lowest point, the distance between the limiting member 91 and the concentrated groove 422 can pass through the pins of the varistor chip but cannot pass through the varistor chip body.

[0057] The positioning member 92 includes a second supporting cross bar 921, on which a plurality of mounting blocks 922 are fixedly mounted, and on each mounting block 922 a pressure rod 923 is rotatably mounted, and the pressure rods 923 correspond to the centralizing grooves 422 one by one;

[0058] In one embodiment of the present invention, the end of the pressure rod 923 is coated with a layer of rubber material;

[0059] In another embodiment of the present invention, the pressure rod 923 is designed with a retractable structure, which can prevent the pressure rod 923 from causing deformation damage to the pins of the varistor chip;

[0060] The rotating member 5 includes a strip-shaped mounting plate 51 fixedly mounted on the bottom of the second receiving bottom plate 423, a plurality of rotating shafts 53 are rotatably mounted on the strip-shaped mounting plate 51, a transmission gear 54 and a rotating disk 55 are fixedly sleeved on the rotating shaft 53, a through hole is provided on the second receiving bottom plate 423 corresponding to the rotating disk 55, and correspondingly, a through hole is provided in each concentrated groove 422, and a rotating disk 55 is rotatably mounted in the through hole, and the upper surface of the rotating disk 55 is on the same horizontal plane as the surface of the second receiving bottom plate 423;

[0061] A driving rack 52 is slidably mounted on the strip-shaped mounting plate 51, and the driving rack 52 is meshed with a transmission gear 54. The reciprocating motion of the rack can be driven to rotate the rotating disk 55 by a linear drive structure such as a linear cylinder.

[0062] A photoelectric switch and an interception structure are provided at the feed end of the diversion channel 33. The photoelectric switch can detect whether a varistor chip passes through the position of the photoelectric switch in the diversion channel 33, and the interception structure can block the diversion channel 33 to prevent the varistor chip from continuing to pass through the diversion channel 33.

[0063] The distance between the varistor chips in the same diversion channel 33 can be maintained at a preset value through the action of the photoelectric switch and the interception structure;

[0064] The working method of the varistor chip directional automatic stacking device of the present invention is:

[0065] In the first step, the varistor chips are transported on the conveyor belt structure 1, and the varistor chips on the surface of the conveyor belt structure 1 are combed by the combing roller 21, so that the varistor chips on the surface of the conveyor belt structure 1 are laid into a layer;

[0066] In the second step, as the conveyor belt structure 1 drives the varistor chip to move forward, the reciprocating drive structure 8 drives the diverter 3 to reciprocate in the horizontal direction, so that the varistor chips enter the guide channel 33 one by one;

[0067] In the third step, the varistor chip is conducted into the guide groove 415. At this time, the limiter 91 is driven to the lowest point. If one end of the pin of the varistor chip is in front, the pin of the varistor chip will pass through the gap between the limiter 91 and the second receiving bottom plate 423 to reach the top of the rotating disk 55. By driving the positioning member 92 to move downward, the pressure rod 923 fixes the pin part of the varistor chip on the rotating disk 55.

[0068] The structural design of the positioner 4 of the present invention can leave enough space for the rotation of the varistor chip;

[0069] Since the varistor chip entering the diversion channel 33 has two situations, one with one end of the pin facing forward and the other with one end of the pin facing backward, and since the pin is fragile and easily damaged, the pin is preferably at the rear end at the final receiving position, so there is a turning operation in the third step;

[0070] In the fourth step, the rotating disk 55 rotates to drive the varistor chip to rotate 180° so that the main part of the varistor chip faces downward, and then the limiting member 91 and the positioning member 92 are lifted to make a row of several varistor chips fall down in a row to facilitate subsequent sorting and stacking.

[0071] When the present invention is working, it can carry out direction transmission of varistor chips in batches, so that the varistor chips are transmitted in rows, which is convenient for subsequent sorting. In addition, considering that one end of the pin of the varistor chip is soft and sharp, it is easy to be deformed by force during the transmission process. The present invention is designed with a positioner 4 structure, which intercepts the varistor chip and rotates the varistor chip with the pin facing forward by 180°, so that all varistor chips are always in a state where the varistor chip body faces forward during the subsequent transmission process. On the one hand, the positioning of the varistor is realized, avoiding the situation in which the varistor chip is in two states at the same time, one end of the pin faces forward and the other end of the pin faces backward during subsequent collection, which makes it impossible to achieve uniform positioning of the varistor chip. On the other hand, it can avoid the deformation of the pin end of the varistor chip due to impact.

[0072] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0073] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A varistor chip directional automatic stacking device, characterized in that: The conveyor belt structure (1) comprises a diverter (3) arranged on the conveyor belt structure (1), a discharge end of the diverter (3) is connected to a feed end of a positioner (4), and the positioner (4) is arranged at an angle; The flow divider (3) comprises an upper cover plate (31), a plurality of parallel partition plates (32) are fixedly mounted on one surface of the upper cover plate (31), a flow guide channel (33) is formed between two adjacent partition plates (32), the width of the flow guide channel (33) can only accommodate one varistor chip to pass through, and the flow divider (3) can reciprocate in the horizontal direction along a direction perpendicular to the conveying direction of the conveyor belt structure (1); The positioner (4) comprises a dispersion plate (41) and a concentration plate (42); the dispersion plate (41) comprises a first receiving bottom plate (411); a plurality of guide grooves (415) are arranged on the first receiving bottom plate (411); and the discharge ends of the plurality of guide grooves (415) are far from each other; The concentrating plate (42) comprises a second receiving bottom plate (423), and a plurality of concentrating grooves (422) are arranged on the second receiving bottom plate (423). The concentrating grooves (422) correspond to the guide grooves (415) one by one, and the concentrating grooves (422) are arranged so that the width gradually decreases from the feeding end to the discharging end; The positioner (4) further comprises a limiter (91) and a positioning member (92) arranged above the feeding end of the concentrating plate (42); a rotating member (5) is arranged below the feeding end of the concentrating plate (42); When the limiting member (91) is at the lowest point, the distance between the limiting member (91) and the concentrated groove (422) is large enough to pass through the pins of the varistor chip but cannot pass through the body of the varistor chip; The positioning member (92) can press the pins of the varistor chip onto the rotating member (5) without affecting the rotation; The rotating member (5) can drive the varistor chip to rotate; The limiting member (91) comprises a first supporting cross bar (911), a plurality of limiting baffles (912) are fixedly mounted on the first supporting cross bar (911), the limiting baffles (912) correspond to the centralizing grooves (422) one by one, and the limiting member (91) can reciprocate in the vertical direction; The positioning member (92) comprises a second supporting cross bar (921), on which a plurality of mounting blocks (922) are fixedly mounted, and on each mounting block (922) a pressure rod (923) is rotatably mounted, and the pressure rods (923) correspond one to one with the central grooves (422).

2. The varistor chip directional automatic stacking device according to claim 1, characterized in that: A side baffle (2) is arranged on the conveyor belt structure (1), a combing roller (21) is rotatably mounted on the side baffle (2), the combing roller (21) is perpendicular to the conveying direction of the conveyor belt structure (1), and bristles are arranged on the surface of the combing roller (21).

3. The varistor chip directional automatic stacking device according to claim 1, characterized in that: A plurality of guide rods (35) are fixedly mounted on the outer sides of the partition plates (32) on both sides of the diverter (3), and the guide rods (35) are slidably mounted on the conveyor belt structure (1). A reinforcing plate (34) is fixedly mounted on the outer sides of the partition plates (32) on both sides of the diverter (3), and the guide rods (35) are fixedly mounted on the reinforcing plate (34).

4. The varistor chip directional automatic stacking device according to claim 1, characterized in that: The surface of the partition plate (32) is coated with a layer of rubber material.

5. The varistor chip directional automatic stacking device according to claim 1, characterized in that: The flow divider (3) is driven by a reciprocating drive structure (8), the reciprocating drive structure (8) comprising a rotating disk (81), a telescopic rod (84) and a transmission rod (83), the rotating disk (81) is driven by a motor to rotate, and a transmission connection shaft (82) is fixedly or rotatably mounted on one side of the rotating disk (81) at a non-central position; One end of the transmission rod (83) is correspondingly rotatably sleeved or fixedly sleeved on the transmission connection shaft (82), and the other end of the transmission rod (83) is hinged to one end of the telescopic rod (84). A limit sleeve (85) is sleeved on the telescopic rod (84), and the limit sleeve (85) is fixedly installed on the conveyor belt structure (1).

6. The varistor chip directional automatic stacking device according to claim 1, characterized in that: The end of the pressure rod (923) is coated with a layer of rubber material.

7. The varistor chip directional automatic stacking device according to claim 1, characterized in that: The rotating member (5) comprises a strip-shaped mounting plate (51) fixedly mounted on the bottom of the second receiving bottom plate (423); a plurality of rotating shafts (53) are rotatably mounted on the strip-shaped mounting plate (51); a transmission gear (54) and a rotating disk (55) are fixedly sleeved on the rotating shaft (53); a through hole is provided on the second receiving bottom plate (423) corresponding to the rotating disk (55); correspondingly, a through hole is provided in each concentrated groove (422); a rotating disk (55) is rotatably mounted in the through hole; and an upper surface of the rotating disk (55) is on the same horizontal plane as a surface of the second receiving bottom plate (423); A driving rack (52) is slidably mounted on the strip-shaped mounting plate (51), and the driving rack (52) is meshed with a transmission gear (54).

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