Automatic cleaning and glue pushing device for BMS product assembly

Abstract

The invention discloses an automatic cleaning and glue pushing device for BMS product assembly, and relates to the technical field of BMS dispensing. The cleaning problem is solved. The device specifically comprises a mounting base, an A / B glue storing and feeding mechanism is arranged in the middle of the mounting base, a cleaning and dispensing mechanism is arranged at the bottom of the mounting base, two lead screws are rotationally connected to the inner wall, located above the A / B glue storing and feeding mechanism, of the mounting base, the outer wall of each lead screw is in threaded connection with a push table, and the push tables are slidably connected to the inner wall of the mounting base; and a driving part for driving the screw rod is arranged at the top of the mounting seat. On one hand, the wiping head is arranged and can clean an area to be dispensed, so that the dispensing effect is guaranteed, on the other hand, the wiping head and the dispensing head are integrally arranged, the procedure station and the arrangement of cleaning equipment are simplified, and the working efficiency is improved. And meanwhile, through rotation of the rotating frame, station switching of the wiping head and the dispensing head can be achieved, vertical or inclined dispensing can be achieved during dispensing of the dispensing head, and the flexibility of the dispensing angle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the BMS dispensing technology field, especially to a kind of automatic cleaning and push glue device of BMS product assembly. BACKGROUND

[0002] BMS product assembly refers to the entire process of assembling various electronic components, structural parts, connectors and the like into a complete, normally operating battery management system (BMS) module or printed circuit board assembly (PCBA).

[0003] This process usually includes SMT patch, wave soldering / reflow soldering, THT plug-in, three-proof paint coating, glue filling / dispensing, shell assembly, testing, wherein the dispensing process is dispensing certain areas or elements for dispensing, heat dissipation or sealing.

[0004] The traditional glue pushing machine does not have cleaning effect, and if dispensing is not cleaned, it will have the disadvantages of insufficient adhesive force and decreased insulation performance of components.

[0005] If another cleaning process is provided, it will cause complex process, multiple equipment use and other defects.

[0006] Therefore, the present application provides an automatic cleaning and glue pushing device for BMS product assembly. SUMMARY

[0007] The purpose of the present application is to solve the shortcomings in the prior art and provide an automatic cleaning and glue pushing device for BMS product assembly.

[0008] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: An automatic cleaning and glue pushing device for BMS product assembly, comprising a mounting seat, an A / B glue storage dispensing mechanism is arranged in the middle of the mounting seat, a cleaning and dispensing mechanism is arranged at the bottom of the mounting seat, two lead screws are rotatably connected to the inner wall of the mounting seat above the A / B glue storage dispensing mechanism, a pushing table is threadedly connected to the outer wall of each lead screw, the pushing table is slidingly connected to the inner wall of the mounting seat, and a driving portion is arranged at the top of the mounting seat to drive the lead screws; The A / B glue storage dispensing mechanism comprises two glue storage boxes storing the same or different types of glue and a piston slidingly connected to the inner wall of the glue storage box, the top of the piston is connected to the pushing table by a push rod, and the bottoms of the two glue storage boxes are communicated and fixed with a multi-way glue mixing pipe; The cleaning and dispensing mechanism comprises a wiping head, a rotating frame and a dispensing head, the rotating frame is rotatably connected to the inner side of the mounting seat, a stop valve is fixed to the inner side of the rotating frame, the top of the stop valve is connected to the multi-way glue mixing pipe by a connecting hose, the dispensing head is fixed to the bottom of the rotating frame, and the wiping head is arranged on the outer wall of the rotating frame.

[0009] Preferably, an extender is fixed to the inner side wall of the mounting seat, and a connecting rod is rotatably connected to the extending end of the extender, and the other end of the connecting rod is rotatably connected to the side wall of the rotating frame.

[0010] Further, the wiping head is movably inserted into the inner wall of one side of the rotating frame, and the side wall of the mounting seat is provided with a cam groove, and one side of the wiping head is movably limited and matched to the inner wall of the cam groove through a limiting column.

[0011] Based on the foregoing scheme, the cam groove is composed of two semicircular arcs and a straight line groove connecting and tangent to the two semicircular arcs.

[0012] In the foregoing scheme, a better scheme is that the outer wall of the mounting seat at the A / B glue storage and feeding mechanism is fixed with a protective shell, the inner wall of the protective shell is respectively provided with a temperature insulation cavity and a containing cavity, the containing cavity is located on the inner side of the temperature insulation cavity, and the inner wall of the containing cavity is fixed with an electric heating wire.

[0013] As a further scheme of the application, the driving part comprises an electric motor, two groups of elastic variable-diameter wheels and two groups of fixed-diameter pulleys, the two groups of fixed-diameter pulleys are respectively fixed to the outer walls of the two lead screws, the two groups of elastic variable-diameter wheels are coaxially fixedly connected through a main shaft, and the two groups of elastic variable-diameter wheels and the fixed-diameter pulleys are respectively matched through a synchronous belt transmission.

[0014] Meanwhile, the two ends of the main shaft are rotatably connected with sliding blocks, the sliding blocks are slidingly connected to the inner wall of the mounting seat, the electric motor is fixed to the outer wall of one of the sliding blocks through bolts, and the output shaft of the electric motor is fixedly connected to one end of the main shaft.

[0015] As a preferred scheme of the application, the outer wall of one side of the mounting seat is fixed with an extender two through bolts, and the extending end of the extender two is fixed to the side wall of the sliding block through bolts.

[0016] Meanwhile, the elastic variable-diameter wheel comprises a base wheel and a plurality of supporting slide columns slidingly connected to the side wall of the base wheel, the outer side of the supporting slide column is fixed with an arc-shaped pulley piece, and the other side of the supporting slide column is connected to the inner wall of the base wheel through an elastic body.

[0017] As a more preferred scheme of the application, one side of the base wheel is rotatably connected with a synchronous disc, the side wall of the supporting slide column is fixed with a limiting rod, and the inner wall of the synchronous disc is provided with a plurality of inclined sliding grooves movably and limitingly matched with the limiting rod.

[0018] The application has the following beneficial effects: 1. The present application, on the one hand, by setting the wiping head, it can clean the area to be glued, so as to ensure the effect of glue dispensing, on the other hand, the wiping head and the glue dispensing head are arranged integrally, which simplifies the process station and the cleaning equipment arrangement, and at the same time, the rotation of the rotating frame can switch the stations of the wiping head and the glue dispensing head, and can also make the glue dispensing head vertical or inclined when dispensing glue, thereby increasing the flexibility of the glue dispensing angle.

[0019] 2. The present application, by setting the wiping head and the rotating frame as movable plug-in, and additionally setting the cam groove and the limiting column, the wiping head can be stretched outward when rotating to the bottom wiping station, and can be retracted inward when being in the non-working station, which can prevent the wiping head in the glue dispensing state from interfering with other components, thereby increasing the reliability.

[0020] 3. The present application, by setting the protective shell, it can maintain the temperature of the glue by using the heating function of the electric heating wire in a low temperature environment, so as to ensure that the glue has good fluidity, thereby ensuring the reliability of the glue pushing and dispensing, and additionally, by setting the temperature insulation cavity, it can prevent the heat of the electric heating wire from leaking, thereby achieving a certain energy saving effect.

[0021] 4. The present application, by using two groups of elastic variable diameter wheels, synchronous belts and fixed diameter pulleys to drive connect two lead screws to the same motor, and then changing the transmission ratio of the two groups of elastic variable diameter wheels, synchronous belts and fixed diameter pulleys through the sliding block, the speed ratio of the two lead screws can be changed, thereby realizing the stepless adjustment of the glue ratio of different glues in the two glue storage boxes.

[0022] 5. The present application, by setting the elastic variable diameter wheel, it can be self-tensioned while meeting the variable diameter, thereby realizing the automatic and reliable variable diameter process, and by setting the synchronous disc, it uses the limiting rod and the inclined sliding groove to synchronize the multiple arc-shaped pulley pieces, thereby ensuring that the multiple arc-shaped pulley pieces are in the same transmission radius state, and ensuring the transmission accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a whole structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly proposed by the present application; Figure 2 It is a cleaning and glue dispensing mechanism structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly proposed by the present application; Figure 3 It is a wiping head and rotating frame cooperation structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly proposed by the present application; Figure 4 It is an A / B glue storage and glue feeding mechanism structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly proposed by the present application; Figure 5A protective shell position structure diagram of an automatic cleaning and pushing glue device for BMS product assembly according to the present application; Figure 6 A protective shell section structure diagram of an automatic cleaning and pushing glue device for BMS product assembly according to the present application; Figure 7 A driving part structure diagram of an automatic cleaning and pushing glue device for BMS product assembly according to the present application; Figure 8 A second extender position structure diagram of an automatic cleaning and pushing glue device for BMS product assembly according to the present application; Figure 9 A flexible variable diameter wheel structure diagram of an automatic cleaning and pushing glue device for BMS product assembly according to the present application; Figure 10 A flexible variable diameter wheel section structure diagram of an automatic cleaning and pushing glue device for BMS product assembly according to the present application.

[0024] In the figure: 1, mounting seat; 2, pushing table; 3, screw rod; 4, driving part; 5, A / B glue storage and feeding mechanism; 6, cleaning and glue dispensing mechanism; 7, connecting hose; 8, wiping head; 9, stop valve; 10, rotating frame; 11, glue dispensing head; 12, connecting rod; 13, first extender; 14, multi-way glue mixing pipe; 15, cam groove; 16, limiting column; 17, pushing rod; 18, glue storage box; 19, piston; 20, protective shell; 21, temperature insulation cavity; 22, containing cavity; 23, electric heating wire; 24, main shaft; 25, sliding block; 26, motor; 27, flexible variable diameter wheel; 28, synchronous belt; 29, elastic body; 30, constant diameter pulley; 31, base wheel; 32, second extender; 33, supporting slide column; 34, arc pulley piece; 35, limiting rod; 36, inclined slide groove; 37, synchronous disc. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be further described in detail below in combination with specific embodiments.

[0026] Embodiments of the present application will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0027] Example 1: An automatic cleaning and pushing glue device for BMS product assembly, as shown in Figures 1-10As shown, including the mounting seat 1, mounting seat 1 can be fixed, also can use x, y, z three-axis mobile sliding table to carry on the sliding type installation, the middle part of mounting seat 1 is provided with A / B glue storage glue feeding mechanism 5, the bottom of mounting seat 1 is provided with clean dispensing mechanism 6, mounting seat 1 is located above A / B glue storage glue feeding mechanism 5, the inner wall is rotatably connected with two lead screws 3, the outer wall of each lead screw 3 is connected with push table 2 through thread, push table 2 is slidably connected to the inner wall of mounting seat 1, and the top of mounting seat 1 is provided with driving part 4 for driving lead screw 3.

[0028] The A / B glue storage glue feeding mechanism 5 comprises two storage glue boxes 18 for storing the same or different glue and a piston 19 slidably connected to the inner wall of the storage glue box 18, the top of the piston 19 is connected to the push table 2 through a push rod 17, and the bottoms of the two storage glue boxes 18 are communicated and fixed with a same multi-way glue mixing pipe 14.

[0029] The clean dispensing mechanism 6 comprises a wiping head 8, a rotating frame 10 and a dispensing head 11, the rotating frame 10 is rotatably connected to the inner side of the mounting seat 1, a stop valve 9 is fixed to the inner side of the rotating frame 10, the top of the stop valve 9 is connected to the multi-way glue mixing pipe 14 through a connecting hose 7, the dispensing head 11 is fixed to the bottom of the rotating frame 10, and the wiping head 8 is arranged on the outer wall of the rotating frame 10.

[0030] In use, the driving part 4 can drive the lead screw 3 to rotate, the lead screw 3 drives the push table 2 to descend through thread connection, the push table 2 drives the piston 19 to descend through the push rod 17, at this time, the stop valve 9 is in an open state, the glue in the storage glue box 18 is extruded by the piston 19, and is sprayed out through the multi-way glue mixing pipe 14, the connecting hose 7, the stop valve 9 and the dispensing head 11 in sequence, and at the same time, before dispensing, the rotating frame 10 is rotated to make the wiping head 8 located at the bottom and reciprocally swing, so as to clean the area to be dispensed.

[0031] The device can clean the area to be dispensed through the wiping head 8, so as to ensure the dispensing effect, the wiping head 8 and the dispensing head 11 are arranged integrally, so as to simplify the process station and the cleaning equipment arrangement, the rotation of the rotating frame 10 can switch the stations of the wiping head 8 and the dispensing head 11, and can make the dispensing head 11 dispense vertically or obliquely, so as to increase the flexibility of the dispensing angle.

[0032] The inner wall of the mounting seat 1 is fixed with a telescopic device 13, the telescopic end of the telescopic device 13 is rotatably connected with a connecting rod 12, the other end of the connecting rod 12 is rotatably connected with the side wall of the rotating frame 10; when the telescopic device 13 is telescoped, it can drive the rotating frame 10 to rotate through the connecting rod 12, so as to drive the wiping head 8 and the dispensing head 11 to switch the stations and make the wiping head 8 reciprocally swing to clean the wiping station.

[0033] As shown in the figure, Figure 3As shown, the wiping head 8 is movably inserted into the inner wall of one side of the rotating frame 10, and the side wall of the mounting base 1 is provided with a cam groove 15. One side of the wiping head 8 is movably limited and matched with the inner wall of the cam groove 15 by a limiting post 16.

[0034] The cam groove 15 consists of two semicircular arcs and a straight groove that connects the two semicircular arcs and is tangent to them.

[0035] This device, by setting the wiping head 8 and the rotating frame 10 to be movably connected, and by adding a cam groove 15 and a limiting post 16, allows the wiping head 8 to extend outward when rotating to the bottom wiping position, and to retract inward when in a non-working position. This prevents the wiping head 8 from interfering with other components during the dispensing process and increases reliability.

[0036] To address liquidity issues; such as Figure 5 , 6 As shown, the mounting base 1 is fixed with a protective shell 20 on the outer wall of the A / B glue storage and dispensing mechanism 5. The inner wall of the protective shell 20 is provided with a heat insulation cavity 21 and a receiving cavity 22. The receiving cavity 22 is located inside the heat insulation cavity 21, and a heating wire 23 is fixed on the inner wall of the receiving cavity 22.

[0037] Since the fluidity of the adhesive is positively correlated with its temperature within a reliable temperature range, this device, by setting up a protective shell 20, can maintain the adhesive temperature in low-temperature environments using the heating function of the heating wire 23, ensuring that the adhesive has good fluidity and thus guaranteeing the reliability of dispensing and pushing the adhesive. In addition, by setting up a heat insulation cavity 21, it can prevent the heat of the heating wire 23 from leaking out, achieving a certain energy-saving effect.

[0038] In this embodiment, the drive unit 4 can drive the lead screw 3 to rotate. The lead screw 3 uses the threaded connection to drive the push table 2 to descend. The push table 2 drives the piston 19 to descend through the push rod 17. At this time, the shut-off valve 9 is in the open state. The glue in the glue storage box 18 is squeezed by the piston 19 and sprayed out after passing through the multi-port mixing tube 14, the connecting hose 7, the shut-off valve 9, and the dispensing head 11 in sequence. At the same time, before dispensing, the wiping head 8 can be positioned at the bottom and reciprocated by rotating the rotating frame 10 to clean the area to be dispensed. In addition, when the telescopic device 13 extends and retracts, it can drive the rotating frame 10 to rotate through the connecting rod 12, thereby driving the wiping head 8 to switch positions with the dispensing head 11 and the wiping head 8 to reciprocate and clean the wiping position.

[0039] Example 2: An automatic cleaning and adhesive dispensing device for BMS product assembly, such as... Figures 1-10As shown in the figure, in order to solve the problem of adjusting the ratio of different glue; this embodiment is improved on the basis of embodiment 1: the driving part 4 includes a motor 26, two sets of elastic variable diameter wheels 27 and two sets of fixed diameter pulleys 30, two sets of the fixed diameter pulleys 30 are fixed on the outer wall of the two lead screws 3, and the two sets of elastic variable diameter wheels 27 are coaxially fixed and connected through the main shaft 24, and the elastic variable diameter wheels 27 and the fixed diameter pulleys 30 are respectively driven and matched through a synchronous belt 28.

[0040] Both ends of the main shaft 24 are rotatably connected with the sliding blocks 25, the sliding blocks 25 are slidably connected with the inner wall of the mounting seat 1, the motor 26 is fixed on the outer wall of one of the sliding blocks 25 through bolts, and the output shaft of the motor 26 is fixedly connected with one end of the main shaft 24.

[0041] The outer wall of one side of the mounting seat 1 is fixed with an extender two 32 through bolts, and the telescopic end of the extender two 32 is fixed on the side wall of the sliding block 25 through bolts.

[0042] When the motor 26 starts, it can drive the two elastic variable diameter wheels 27 to rotate through the main shaft 24, so as to drive the fixed diameter pulleys 30 to rotate through the synchronous belt 28, so that the lead screw 3 rotates, and when the extender two 32 telescopes, it drives the sliding block 25 to slide, so that the position of the elastic variable diameter wheel 27 changes, the distance between one set of elastic variable diameter wheels 27 and the fixed diameter pulleys 30 becomes smaller, the transmission ratio becomes smaller, and the distance between the other set of elastic variable diameter wheels 27 and the fixed diameter pulleys 30 becomes larger, the transmission ratio increases, so as to adjust the speed ratio of the two lead screws 3.

[0043] The device, by two lead screws 3 using two sets of elastic variable diameter wheels 27, synchronous belt 28, fixed diameter pulley 30 transmission connection in the same motor 26, and then through the sliding block 25 sliding to realize the transmission ratio change of two sets of elastic variable diameter wheels 27, synchronous belt 28, fixed diameter pulley 30, so as to change the speed ratio of the two lead screws 3, realize the stepless adjustment of the ratio of different glue in the two glue storage boxes 18.

[0044] The elastic variable diameter wheel 27 includes a base wheel 31 and a plurality of support slide columns 33 radially slidably connected to the side wall of the base wheel 31, the outer side of the support slide column 33 is fixed with an arc pulley piece 34, and the other side of the support slide column 33 is connected to the inner wall of the base wheel 31 through the elastic body 29.

[0045] The side of the base wheel 31 is rotatably connected with a synchronous disc 37, the side wall of the support slide column 33 is fixed with a limiting rod 35, and the inner wall of the synchronous disc 37 is provided with a plurality of inclined sliding grooves 36 which are movably limited and matched with the limiting rod 35.

[0046] The elastic body 29 will exert an elastic force to the support slide column 33 to the outside, so that the arc-shaped pulley piece 34, the synchronous belt 28 and the constant-diameter pulley 30 are always in a tension state, but when the center distance of the arc-shaped pulley piece 34 and the constant-diameter pulley 30 changes, the arc-shaped pulley piece 34 will be expanded outward or contracted inward by the elastic force of the elastic body 29, so as to realize the change of the transmission variable diameter.

[0047] The device is provided with the elastic variable-diameter wheel 27, which can be self-tensioned while meeting the variable diameter, so as to realize the automatic and reliable variable-diameter process, and the synchronous disc 37 is arranged, which is used for synchronously matching the multiple arc-shaped pulley pieces 34 by the limiting rod 35 and the inclined slide groove 36, so as to ensure that the multiple arc-shaped pulley pieces 34 are in the same transmission radius state and ensure the transmission precision.

[0048] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An automatic cleaning and adhesive dispensing device for BMS product assembly, comprising a mounting base (1), characterized in that, The mounting base (1) is provided with an A / B glue storage and dispensing mechanism (5) in the middle and a cleaning and dispensing mechanism (6) at the bottom. The inner wall of the mounting base (1) above the A / B glue storage and dispensing mechanism (5) is rotatably connected to two screws (3). The outer wall of each screw (3) is connected to a pusher (2) by a thread. The pusher (2) is slidably connected to the inner wall of the mounting base (1). The top of the mounting base (1) is provided with a drive unit (4) for driving the screws (3). The A / B glue storage and dispensing mechanism (5) includes two glue storage boxes (18) for storing the same or different types of glue and a piston (19) slidably connected to the inner wall of the glue storage box (18). The top of the piston (19) is connected to the push table (2) through a push rod (17). The bottoms of the two glue storage boxes (18) are connected and fixed with the same multi-port mixing tube (14). The cleaning and dispensing mechanism (6) includes a wiping head (8), a rotating frame (10), and a dispensing head (11). The rotating frame (10) is rotatably connected to the inner side of the mounting base (1). A shut-off valve (9) is fixed on the inner side of the rotating frame (10). The top of the shut-off valve (9) is connected to the multi-port mixing tube (14) through a connecting hose (7). The dispensing head (11) is fixed to the bottom of the rotating frame (10), and the wiping head (8) is located on the outer wall of the rotating frame (10).

2. The device for automatic cleaning and glue pushing of BMS product assembly according to claim 1, characterized in that, The inner wall of the mounting base (1) is fixed with a telescopic device (13), and the telescopic end of the telescopic device (13) is rotatably connected to a connecting rod (12), and the other end of the connecting rod (12) is rotatably connected to the side wall of the rotating frame (10).

3. The device for automatic cleaning and glue pushing of BMS product assembly according to claim 1, characterized in that, The wiping head (8) is movably inserted into the inner wall of one side of the rotating frame (10). The side wall of the mounting base (1) is provided with a cam groove (15). One side of the wiping head (8) is movably limited and matched with the inner wall of the cam groove (15) by a limiting post (16).

4. The device for automatic cleaning and glue pushing of BMS product assembly according to claim 3, characterized in that, The cam groove (15) consists of two semicircular arcs and a straight groove that connects the two semicircular arcs and is tangent to them.

5. The automatic cleaning and adhesive application device for BMS product assembly according to claim 1, characterized in that, The mounting base (1) is fixed with a protective shell (20) on the outer wall of the A / B glue storage and dispensing mechanism (5). The inner wall of the protective shell (20) is provided with a heat insulation cavity (21) and a receiving cavity (22). The receiving cavity (22) is located inside the heat insulation cavity (21), and an electric heating wire (23) is fixed on the inner wall of the receiving cavity (22).

6. The automatic cleaning and adhesive dispensing device for BMS product assembly according to claim 1, characterized in that, The drive unit (4) includes a motor (26), two sets of flexible variable diameter pulleys (27) and two sets of fixed diameter pulleys (30). The two sets of fixed diameter pulleys (30) are respectively fixed to the outer walls of two lead screws (3). The two sets of flexible variable diameter pulleys (27) are coaxially fixedly connected through the main shaft (24). The two sets of flexible variable diameter pulleys (27) and the fixed diameter pulleys (30) are respectively driven by a synchronous belt (28).

7. The automatic cleaning and adhesive application device for BMS product assembly according to claim 6, characterized in that, Both ends of the main shaft (24) are rotatably connected to sliders (25). The sliders (25) are slidably connected to the inner wall of the mounting base (1). The motor (26) is fixed to the outer wall of one of the sliders (25) by bolts, and the output shaft of the motor (26) is fixedly connected to one end of the main shaft (24).

8. The automatic cleaning and adhesive dispensing device for BMS product assembly according to claim 7, characterized in that, One side of the mounting base (1) is fixed with a second expansion joint (32) by bolts, and the telescopic end of the second expansion joint (32) is fixed to the side wall of the slider (25) by bolts.

9. The automatic cleaning and adhesive dispensing device for BMS product assembly according to claim 6, characterized in that, The elastic variable diameter wheel (27) includes a base wheel (31) and a plurality of support slides (33) that are radially slidably connected to the side wall of the base wheel (31). An arc-shaped pulley piece (34) is fixed on the outer side of the support slide (33), and the other side of the support slide (33) is connected to the inner wall of the base wheel (31) through an elastic body (29).

10. The automatic cleaning and adhesive dispensing device for BMS product assembly according to claim 9, characterized in that, The base wheel (31) is rotatably connected to a timing disc (37), and a limit rod (35) is fixed to the side wall of the supporting slide column (33). The inner wall of the timing disc (37) is provided with multiple inclined grooves (36) that are movable and limited by the limit rod (35).

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