An automatic buckle pressing machine

Abstract

The utility model relates to the field of buckle presser, disclose a kind of automatic buckle presser, including rack and two feeding devices, first pressure cylinder, second pressure cylinder and driving device being located on rack;First pressure cylinder and second pressure cylinder are mutually parallel, and first pressure cylinder is equipped with first limit slot on the outer peripheral wall, and second pressure cylinder is equipped with second limit slot on the outer peripheral wall, and first limit slot and second limit slot respectively with the discharge end of two feeding guide butt joint, and first limit slot is used to accommodate single upper electrode buckle, and limit its buckle foot protrude the outer peripheral surface of first pressure cylinder, and second limit slot is used to accommodate and limit single lower electrode buckle;Driving device is drivingly connected with first pressure cylinder and second pressure cylinder, for driving first pressure cylinder and second pressure cylinder rotate around opposite direction, to make the buckle foot of the upper electrode buckle in first limit slot press into the buckle groove of the lower electrode buckle in second limit slot.In the utility model, how to improve product pressing quality and production efficiency problem can be solved.

Description

Technical Field

[0001] This utility model relates to the field of snap fasteners, specifically to an automatic snap fastener. Background Technology

[0002] As a key component of an ECG monitoring system, the ECG electrode pad is mainly composed of two parts: an upper electrode clip and a lower electrode clip. Specifically, the upper electrode clip has a protruding clip in the middle of one side, while the lower electrode clip has a corresponding clip groove in the middle of one side. In actual production, pressure is applied to ensure that the clip of the upper electrode clip and the clip groove of the lower electrode clip are precisely engaged. Then, combined with a conductive hydrogel with good conductivity, the ECG electrode pad is formed and manufactured.

[0003] Currently, the most widely used snap-fit ​​machines on the market typically use a stepping mechanism to push the upper and lower electrode snaps closer together and press them into one piece. After pressing, a conveyor belt is started to transport the finished product to the next production stage. However, this traditional snap-fit ​​machine has revealed many problems in actual operation.

[0004] First, because the electrode buckles are lightweight and have a smooth surface, they are easily affected by mechanical vibrations and airflow during the pressing process by the stepping mechanism. This can cause the upper and lower electrode buckles to shift during pressing, thus affecting the pressing quality. Furthermore, the conveyor belt must be paused for each pressing operation, waiting for the buckles to be pressed before restarting. This intermittent production method results in an inconsistent production process, increases the production cycle, reduces overall production efficiency, and fails to meet the demands of large-scale, high-efficiency production.

[0005] Given the aforementioned problems with existing crimping machines, it is particularly necessary to develop an automatic crimping machine that can improve product crimping quality and production efficiency. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] This utility model provides an automatic snap-fit ​​machine, which can at least solve the technical problem of how to improve the product snap-fit ​​quality and production efficiency.

[0008] (II) Technical Solution

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an automatic buckle pressing machine, comprising:

[0010] frame;

[0011] Two feeding devices are mounted on the frame. The two feeding devices are used to continuously output the upper electrode buckle and the lower electrode buckle one by one.

[0012] The first pressure cylinder and the second pressure cylinder are parallel to each other and are rotatably mounted on the frame. The outer peripheral wall of the first pressure cylinder is provided with a first limiting groove, and the outer peripheral wall of the second pressure cylinder is provided with a second limiting groove. The first limiting groove and the second limiting groove are respectively connected to the discharge ends of the two feeding devices. The first limiting groove is used to accommodate a single upper electrode buckle and restrict its buckle foot from protruding from the outer peripheral surface of the first pressure cylinder. The second limiting groove is used to accommodate and limit a single lower electrode buckle.

[0013] A driving device is mounted on the frame and is connected to the first pressure cylinder and the second pressure cylinder in a transmission manner. The driving device is used to drive the first pressure cylinder and the second pressure cylinder to rotate in opposite directions so that the upper electrode buckle in the first limiting groove and the lower electrode buckle in the second limiting groove are positioned relative to each other, thereby pressing the buckle foot of the upper electrode buckle into the buckle groove of the lower electrode buckle.

[0014] Further, the aforementioned upper electrode buckle includes a main body and a buckle foot integrally connected to the middle of the main body. The first limiting groove is adapted to the shape of the main body, and the depth of the first limiting groove is equal to the thickness of the main body, so that the buckle foot of the upper electrode buckle completely protrudes from the outer peripheral surface of the first pressure cylinder.

[0015] The second limiting groove is adapted to the shape of the lower electrode buckle, and the depth of the second limiting groove is consistent with the thickness of the lower electrode buckle, so that the buckle groove opening of the lower electrode buckle is flush with the groove opening of the second limiting groove.

[0016] Furthermore, the outer peripheral wall of the aforementioned first pressure cylinder is provided with at least two first limiting grooves distributed in annular intervals, and the outer peripheral wall of the second pressure cylinder is provided with at least two second limiting grooves distributed in annular intervals. The number of first limiting grooves and second limiting grooves are the same and their positions correspond one-to-one.

[0017] Further, the aforementioned feeding device includes a feeding mechanism and a feeding guide rail mounted on the frame. The discharge end of the feeding mechanism is connected to the inlet end of the feeding guide rail. The feeding mechanism is used to continuously output upper electrode buckles or lower electrode buckles one by one. The feeding guide rail is used to receive the upper electrode buckles or lower electrode buckles output by the feeding mechanism and transfer them one by one into the first limiting groove or the second limiting groove.

[0018] Furthermore, the rotating shafts of the aforementioned first and second pressure cylinders are arranged to extend laterally;

[0019] The feeding guide rail extends obliquely from top to bottom toward the first or second pressure cylinder to be connected. The bottom of the discharge end of the feeding guide rail is provided with a clearance hole, which is used to connect with the first or second limiting groove so that a single upper electrode buckle or lower electrode buckle can fall into the first or second limiting groove.

[0020] Furthermore, the rotating shafts of the aforementioned first and second pressure cylinders extend vertically.

[0021] The automatic buckle pressing machine also includes an adsorption device. The bottom of the first limiting groove is provided with a first air suction hole, and the bottom of the second limiting groove is provided with a second air suction hole. Both the first air suction hole and the second air suction hole are connected to the adsorption device. The first air suction hole is used to adsorb the upper electrode buckle in the first limiting groove, and the second air suction hole is used to adsorb the lower electrode buckle in the second limiting groove.

[0022] Further configuration: the aforementioned drive device includes a rotary drive mechanism and two gears. The first pressure cylinder and the second pressure cylinder have the same diameter. The two gears are coaxially mounted on the first pressure cylinder and the second pressure cylinder, and the two gears mesh with each other. The rotary drive mechanism is mounted on the frame, and the output end of the rotary drive mechanism is connected to one of the gears.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the automatic buckle pressing machine provided by this utility model has the following beneficial effects:

[0025] In use, the automatic snap-fit ​​machine provided by this utility model accurately feeds the upper and lower electrode snaps into the first and second limiting grooves, respectively. Then, the drive device drives the first and second pressing cylinders to rotate in opposite directions, causing the first and second limiting grooves to move towards each other and then away from each other, repeating this cycle. During the rotation of the first and second pressing cylinders, as the first and second limiting grooves are about to align, the snap foot of the upper electrode snap in the first limiting groove is gradually and precisely pressed into the snap groove of the lower electrode snap in the second limiting groove, until the first and second limiting grooves are completely aligned. At this point, the upper and lower electrode snaps are successfully snapped together, forming a finished product. When the first and second limiting grooves move away from each other, the assembled finished product can be removed from the first and second limiting grooves, smoothly completing the unloading of the finished product. This cycle repeats continuously, enabling the automatic snap-fit ​​machine to achieve continuous production of finished products. As can be seen, this utility model constructs a highly automated snap-fit ​​system through the coordinated operation of the feeding device, the first pressing cylinder, the second pressing cylinder, and the driving device. It realizes automatic feeding, precise positioning, automatic pressing, and automatic unloading of the upper and lower electrode snaps, which significantly improves the automation level of the snap-fit ​​process. Moreover, the electrode snap conveying and pressing operations are carried out simultaneously, without the need to stop and wait for the pressing to be completed before conveying the electrode snaps, as is the case with traditional equipment. The entire production process is smooth and continuous, effectively improving the product pressing quality and overall production efficiency. Attached Figure Description

[0026] Figure 1 This is a perspective view of the automatic buckle presser in a horizontal setting state in the embodiment;

[0027] Figure 2 This is a perspective view of the automatic buckle presser in a vertical setting state in the embodiment;

[0028] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0029] Icon labels:

[0030] 1. Rack;

[0031] 2. Feeding device; 21. Feeding guide rail; 22. Clearance hole;

[0032] 3. First pressure cylinder; 31. First limiting groove; 32. First air intake hole;

[0033] 4. Second pressure cylinder; 41. Second limiting groove; 42. Second air intake hole;

[0034] 5. Drive unit; 51. Gear;

[0035] 6. Upper electrode buckle; 61. Buckle foot; 62. Main body;

[0036] 7. Lower electrode buckle; 71. Buckle groove. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] This invention provides an automatic snap-fitting machine to solve the problem of how to improve the product snap-fitting quality and production efficiency.

[0039] See Figure 1 and Figure 2 As shown, Figure 1 This is a perspective view of the automatic buckle presser in a horizontal setting state in the embodiment. Figure 2 The image shown is a perspective view of the automatic snap fastener in a vertical setting state in the embodiment. The automatic snap fastener includes a frame 1, a feeding device 2, a first pressing cylinder 3, a second pressing cylinder 4, and a driving device 5.

[0040] There are two feeding devices 2, both mounted on the frame 1. The two feeding devices 2 are used to continuously output the upper electrode buckle 6 and the lower electrode buckle 7 one by one.

[0041] The first pressure cylinder 3 and the second pressure cylinder 4 are parallel to each other and are both rotatably connected to the frame 1. The outer peripheral wall of the first pressure cylinder 3 has a first limiting groove 31. The outer peripheral wall of the second pressure cylinder 4 has a second limiting groove 41. The first limiting groove 31 and the second limiting groove 41 are respectively connected to the discharge ends of the two feeding guide rails 21. The first limiting groove 31 is used to accommodate a single upper electrode buckle 6 and restrict its buckle foot 61 from protruding from the outer peripheral surface of the first pressure cylinder 3 so that the buckle foot 61 can be pressed into the buckle groove 71 of the lower electrode buckle 7. The second limiting groove 41 is used to accommodate and limit a single lower electrode buckle 7.

[0042] The drive unit 5 is mounted on the frame 1 and is connected to the first pressure cylinder 3 and the second pressure cylinder 4. The drive unit 5 is used to drive the first pressure cylinder 3 and the second pressure cylinder 4 to rotate in opposite directions, so that the upper electrode buckle 6 in the first limiting groove 31 and the lower electrode buckle 7 in the second limiting groove 41 are positioned relative to each other, thereby pressing the buckle foot 61 of the upper electrode buckle 6 into the buckle groove 71 of the lower electrode buckle 7, thus achieving the pressing of the two together.

[0043] When using the automatic snap-fit ​​machine described above, the two feeding devices 2 accurately feed the upper electrode snap 6 and the lower electrode snap 7 into the first limiting groove 31 and the second limiting groove 41, respectively. Subsequently, the driving device 5 drives the first pressing cylinder 3 and the second pressing cylinder 4 to rotate in opposite directions, thereby causing the first limiting groove 31 and the second limiting groove 41 to move towards each other first, then away from each other, and so on repeatedly. During the rotation of the first pressing cylinder 3 and the second pressing cylinder 4, when the first limiting groove 31 and the second limiting groove 41 are about to be aligned, the snap foot 61 of the upper electrode snap 6 in the first limiting groove 31 will gradually and precisely press into the snap groove 71 of the lower electrode snap 7 in the second limiting groove 41, until the positions of the first limiting groove 31 and the second limiting groove 41 are completely aligned, and the snap foot 61 is also completely and tightly pressed into the snap groove 71. At this point, the upper electrode snap 6 and the lower electrode snap 7 are successfully snapped together, forming a finished product. When the first limiting groove 31 and the second limiting groove 41 move in opposite directions, the assembled finished product can be moved out of the first limiting groove 31 and the second limiting groove 41, and the unloading of the finished product can be completed smoothly. This cycle repeats, and the automatic snap-fit ​​machine achieves continuous production of finished products. It can be seen that this utility model, through the coordinated cooperation of the feeding device 2, the first pressing cylinder 3, the second pressing cylinder 4, and the driving device 5, constructs a highly automated snap-fit ​​system, realizing automatic feeding, precise positioning, automatic pressing, and automatic unloading of the upper electrode snap 6 and the lower electrode snap 7. This significantly improves the automation level of the snap-fit ​​process. Furthermore, the electrode snap conveying and pressing operations are performed simultaneously, eliminating the need to stop and wait for pressing to complete before conveying the electrode snap, as is the case with traditional equipment. The entire production process is smooth and continuous, effectively improving the product pressing quality and overall production efficiency.

[0044] Furthermore, this utility model can accurately limit the position of the upper electrode buckle 6 and the lower electrode buckle 7 before and during pressing by the first limiting groove 31 and the second limiting groove 41, which effectively improves the stability and accuracy of the upper electrode buckle 6 and the lower electrode buckle 7 during the pressing and moving process, so that the buckle foot 61 and the buckle groove 71 can accurately align during the pressing process, which greatly improves the pressing quality of the product.

[0045] See Figure 1 , Figure 2 and Figure 3 As shown, Figure 3 for Figure 2 The enlarged schematic diagram at point A shows that, in one embodiment of the first limiting groove 31 and the second limiting groove 41, the upper electrode buckle 6 includes a main body 62 and a buckle foot 61 integrally connected to the middle of the main body 62. The first limiting groove 31 is adapted to the shape of the main body 62, and the depth of the first limiting groove 31 is equal to the thickness of the main body 62, so that the buckle foot 61 of the upper electrode buckle 6 completely protrudes from the outer peripheral surface of the first pressure cylinder 3. The second limiting groove 41 is adapted to the shape of the lower electrode buckle 7, and the depth of the second limiting groove 41 is consistent with the thickness of the lower electrode buckle 7, so that the opening of the buckle groove 71 of the lower electrode buckle 7 is flush with the opening of the groove of the second limiting groove 41. In this way, the electrode buckle can be positioned more accurately through the first limiting groove 31 and the second limiting groove 41, ensuring accurate alignment of the buckle foot 61 and the buckle groove 71 during pressing, improving the pressing quality and reducing the scrap rate.

[0046] Based on the above embodiment, the outer peripheral wall of the first pressure cylinder 3 has at least two annularly spaced first limiting grooves 31, and the outer peripheral wall of the second pressure cylinder 4 has at least two annularly spaced second limiting grooves 41. The number of first limiting grooves 31 and second limiting grooves 41 are the same, and their positions correspond one-to-one. In this way, the automatic buckle pressing machine can realize the feeding and pressing operations of multiple pairs of upper electrode buckles 6 and lower electrode buckles 7 during one rotation of the first pressure cylinder 3 and the second pressure cylinder 4, further improving the overall production efficiency.

[0047] Based on the above embodiments, the number of the first limiting groove 31 and the second limiting groove 41 can be set to more than four, so that the operations of feeding, conveying, pressing and unloading electrode buckles can be carried out simultaneously, further improving the overall production efficiency.

[0048] See Figure 1 , Figure 2 and Figure 3As shown, in one embodiment of the feeding device 2, the feeding device 2 includes a feeding mechanism (not shown in the figure) and a feeding guide rail 21. Both the feeding mechanism and the feeding guide rail 21 are mounted on the frame 1 by welding or screwing. The discharge end of the feeding mechanism is connected to the inlet end of the feeding guide rail 21. The feeding mechanism is used to continuously output upper electrode buckles 6 or lower electrode buckles 7 one by one. The feeding guide rail 21 is used to receive the upper electrode buckles 6 or lower electrode buckles 7 output by the feeding mechanism and transfer them one by one into the first limiting groove 31 or the second limiting groove 41. Thus, the combined design of the feeding mechanism and the feeding guide rail 21 realizes the automatic and orderly feeding of upper electrode buckles 6 and lower electrode buckles 7, ensuring that the electrode buckles can be accurately and stably delivered to the corresponding limiting grooves, providing a reliable material supply for subsequent pressing processes, and improving the continuity and stability of production.

[0049] The aforementioned feeding mechanism can use existing mechanical vibratory feeders to continuously feed materials one by one.

[0050] This invention can also be used without a feeding mechanism, using only the feeding guide rail 21 for feeding.

[0051] See Figure 1 As shown, in the first arrangement of the first pressure cylinder 3 and the second pressure cylinder 4, the rotating shafts of the first pressure cylinder 3 and the second pressure cylinder 4 extend laterally. The feeding guide rail 21 extends obliquely from top to bottom toward the docking first pressure cylinder 3 or second pressure cylinder 4. A clearance hole 22 is opened at the bottom of the discharge end of the feeding guide rail 21. The clearance hole 22 is used to dock with the first limiting groove 31 or the second limiting groove 41, so that a single upper electrode buckle 6 or lower electrode buckle 7 can fall into the first limiting groove 31 or the second limiting groove 41. In this way, when the rotating shaft of the pressure cylinder is arranged laterally, the design of the oblique feeding guide rail 21 and the clearance hole 22 allows the electrode buckle to slide naturally into the corresponding limiting groove by gravity. The structure is simple, the feeding is convenient and quick, and it can ensure that a single electrode buckle falls accurately into the limiting groove, thus improving the feeding efficiency and accuracy. After pressing is completed, the pressing cylinder continues to rotate, so that the openings of the first limiting groove 31 and the second limiting groove 41 face downwards, thereby allowing the electrode buckle to move out of the limiting groove naturally and automatically complete the unloading.

[0052] See Figure 2As shown, in the second arrangement of the first pressure cylinder 3 and the second pressure cylinder 4, the rotating shafts of the first pressure cylinder 3 and the second pressure cylinder 4 extend vertically. The automatic button-pressing machine also includes an adsorption device (not shown in the figure). The bottom of the first limiting groove 31 has a first suction hole 32, and the bottom of the second limiting groove 41 has a second suction hole 42. Both the first suction hole 32 and the second suction hole 42 are connected to the adsorption device. The first suction hole 32 is used to adsorb the upper electrode button 6 in the first limiting groove 31. The second suction hole 42 is used to adsorb the lower electrode button 7 in the second limiting groove 41. Thus, since the first pressure cylinder 3 and the second pressure cylinder 4 are vertically arranged, the upper electrode buckle 6 and the lower electrode buckle 7 may fall off from the corresponding limiting groove due to gravity. However, suction holes are set at the bottom of the first and second limiting grooves 41 and connected to an adsorption device. In this way, when the electrode buckle enters the limiting groove, the position of the electrode buckle can be further fixed by adsorption, effectively preventing the upper electrode buckle 6 and the lower electrode buckle 7 from shifting or even falling off during the rotation of the pressure cylinder. This ensures the accuracy and stability of the pressing and guarantees the quality of the buckle. The adsorption device stops suction after the pressing is completed, so that the upper electrode buckle 6 and the lower electrode buckle 7 can be removed from the limiting groove.

[0053] The above-mentioned adsorption device can use existing vacuum adsorption equipment.

[0054] See Figure 1 and Figure 2 As shown, in one embodiment of the driving device 5, the driving device 5 includes a rotary driving mechanism (not shown in the figure) and two gears 51. The first pressure cylinder 3 and the second pressure cylinder 4 have the same diameter. The two gears 51 are coaxially mounted on the first pressure cylinder 3 and the second pressure cylinder 4 by means of integral connection or welding, respectively. The two gears 51 mesh with each other. The rotary driving mechanism is mounted on the frame 1 by means of screw connection or welding, and the output end of the rotary driving mechanism is connected to one of the gears 51 by means of welding or pin connection. In this way, through the transmission of the rotary driving mechanism and the meshing gears 51, the rotation speed and direction of the first and second pressure cylinders 4 can be precisely controlled, ensuring that they rotate synchronously in opposite directions, so that the upper electrode buckle 6 and the lower electrode buckle 7 can accurately align and complete the pressing action, improving the pressing accuracy and stability. At the same time, this transmission structure is simple, reliable, and easy to maintain.

[0055] The aforementioned rotary drive mechanism can use existing rotary motors, rotary cylinders, or other rotary drive mechanisms.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic snap-on machine, characterized in that, include: frame; Two feeding devices are both mounted on the frame, and the two feeding devices are used to continuously output the upper electrode buckle and the lower electrode buckle one by one; The first pressure cylinder and the second pressure cylinder are parallel to each other and rotatably mounted on the frame. The outer peripheral wall of the first pressure cylinder is provided with a first limiting groove, and the outer peripheral wall of the second pressure cylinder is provided with a second limiting groove. The first limiting groove and the second limiting groove are respectively connected to the discharge ends of the two feeding devices. The first limiting groove is used to accommodate a single upper electrode buckle and restrict its buckle foot from protruding from the outer peripheral surface of the first pressure cylinder. The second limiting groove is used to accommodate and limit a single lower electrode buckle. A driving device is mounted on the frame and is connected to the first pressure cylinder and the second pressure cylinder in a driving manner. The driving device is used to drive the first pressure cylinder and the second pressure cylinder to rotate in opposite directions so that the upper electrode buckle in the first limiting groove and the lower electrode buckle in the second limiting groove are positioned opposite each other, thereby pressing the buckle foot of the upper electrode buckle into the buckle groove of the lower electrode buckle.

2. The automatic snap-on machine according to claim 1, characterized in that, The upper electrode buckle includes a main body and a buckle foot integrally connected to the middle of the main body; the first limiting groove is adapted to the shape of the main body, and the depth of the first limiting groove is equal to the thickness of the main body, so that the buckle foot of the upper electrode buckle completely protrudes from the outer peripheral surface of the first pressure cylinder. The second limiting groove is adapted to the shape of the lower electrode buckle, and the depth of the second limiting groove is consistent with the thickness of the lower electrode buckle, so that the buckle groove opening of the lower electrode buckle is flush with the groove opening of the second limiting groove.

3. The automatic buckle pressing machine according to claim 2, characterized in that, The outer peripheral wall of the first pressure cylinder is provided with at least two first limiting grooves distributed in an annular interval, and the outer peripheral wall of the second pressure cylinder is provided with at least two second limiting grooves distributed in an annular interval. The number of the first limiting grooves and the second limiting grooves are the same and their positions are set in a one-to-one correspondence.

4. The automatic buckle pressing machine according to any one of claims 1-3, characterized in that, The feeding device includes a feeding mechanism and a feeding guide rail mounted on the frame. The discharge end of the feeding mechanism is connected to the inlet end of the feeding guide rail. The feeding mechanism is used to continuously output the upper electrode buckle or the lower electrode buckle one by one. The feeding guide rail is used to receive the upper electrode buckle or the lower electrode buckle output by the feeding mechanism and transfer them one by one into the first limiting groove or the second limiting groove.

5. The automatic snap-on machine according to claim 4, characterized in that, The rotating shafts of the first pressure cylinder and the second pressure cylinder are arranged to extend laterally; The feeding guide rail extends obliquely from top to bottom toward the first or second pressure cylinder to be connected. The bottom of the discharge end of the feeding guide rail is provided with a clearance hole, which is used to connect with the first or second limiting groove so that a single upper electrode buckle or lower electrode buckle can fall into the first or second limiting groove.

6. The automatic buckle pressing machine according to claim 4, characterized in that, The rotating shafts of the first pressure cylinder and the second pressure cylinder extend vertically. The automatic button press machine also includes an adsorption device. The bottom of the first limiting groove is provided with a first air suction hole, and the bottom of the second limiting groove is provided with a second air suction hole. Both the first air suction hole and the second air suction hole are connected to the adsorption device. The first air suction hole is used to adsorb the upper electrode button in the first limiting groove, and the second air suction hole is used to adsorb the lower electrode button in the second limiting groove.

7. The automatic buckle-pressing machine according to any one of claims 1, 2, 3, 5, and 6, characterized in that, The driving device includes a rotary driving mechanism and two gears. The first pressure cylinder and the second pressure cylinder have the same diameter. The two gears are coaxially mounted on the first pressure cylinder and the second pressure cylinder, and the two gears mesh with each other. The rotary driving mechanism is mounted on the frame, and the output end of the rotary driving mechanism is connected to one of the gears.

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