Method for cutting a bib and cutting device

Abstract

The application discloses a kind of bib cutting method and cutting device, the bib is cut in the rear end of full-automatic bib folding machine, it is cut from the wide side of fabric to the wide other side of fabric by rotating blade (7), and bib is cut out;When the rotating speed of blade (7) and the moving speed of fabric are fixed, by controlling the included angle between the rotating surface of blade (7) and the moving direction of fabric, the cutting seam formed by blade (7) on fabric is perpendicular to the length direction of fabric, the size of included angle is inversely proportional to the moving speed of fabric, and the size of included angle is proportional to the rotating speed of blade (7);When the included angle between the rotating surface of blade (7) and the moving direction of fabric is fixed, by controlling the proportion of the moving speed of fabric or the cutting speed of blade (7), the cutting seam formed by blade (7) on fabric is perpendicular to the length direction of fabric.The application has the advantages of good cutting effect, low device failure rate and wide application range.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of disposable bibs, and particularly relates to a bib cutting method and a cutting device. BACKGROUND

[0002] The full-automatic bib folding machine (hereinafter referred to as the bib folding machine) is used in a disposable bib production line, can pull the preliminarily processed fabric to move along a plurality of serially driven rollers, and automatically complete the hole cutting, folding and slitting of the fabric in sequence during the movement, so that a folded bib is obtained after the slitting.

[0003] The device for slitting and cutting the fabric on the full-automatic bib folding machine comprises a horizontal cutting table plate, the fabric passes through the table surface of the cutting table plate, a rotating shaft is arranged above the cutting table plate, a plate-shaped rolling cutter is arranged on the rotating shaft, the rolling cutter is perpendicular to the moving direction of the fabric, the rolling cutter cuts the fabric once per rotation, and a bib is cut out.

[0004] It is found in the use that, since the rolling cutter cuts out the bib through a linear blade edge, and there is a large pressure between the blade edge and the cutting table plate, the blade edge is prone to be blunt, the division of the obtained bibs is not complete, local adhesion exists between the bibs, workers need to further separate the bibs, and the cutting effect is poor. SUMMARY

[0005] The present application aims to provide a bib cutting method and a cutting device.

[0006] The technical scheme of the present application is as follows: the bib cutting method, the bib is cut at the rear end of the full-automatic bib folding machine, the blade is rotated to cut from one side of the width direction of the fabric to the other side of the width direction of the fabric, and the bib is cut out.

[0007] In the foregoing bib cutting method, when the rotating speed of the blade and the moving speed of the fabric are fixed, the included angle between the rotating surface of the blade and the moving direction of the fabric is controlled, the cutting seam formed by the blade on the fabric is perpendicular to the length direction of the fabric, the size of the included angle is inversely proportional to the moving speed of the fabric, and the size of the included angle is proportional to the rotating speed of the blade.

[0008] In the foregoing bib cutting method, when the included angle between the rotating surface of the blade and the moving direction of the fabric is fixed, the proportion of the moving speed of the fabric or the cutting speed of the blade is controlled, and the cutting seam formed by the blade on the fabric is perpendicular to the length direction of the fabric.

[0009] The cutting device for realizing the aforementioned cutting method of the apron comprises a supporting plate arranged at the rear end of the full-automatic apron folding machine, the supporting plate is connected to the frame of the full-automatic apron folding machine through a support, the top of the supporting plate is provided with a horizontal plane, the rear side of the plane is provided with a circular arc surface, the lowest part of the circular arc surface is equal to or higher than the plane, the circular arc surface and the plane are smoothly connected through a bridging curved surface, the circular arc surface is provided with an inclined notch, the two ends of the notch respectively penetrate through the two sides of the supporting plate in the width direction, the upper side of the notch is provided with a rotatable blade, the rotating surface of the blade penetrates through the notch, and the rotating point of the blade is located on the axis of the circular arc surface.

[0010] In the aforementioned cutting device, the two sides of the notch are respectively provided with a first driving mechanism and a second driving mechanism, the first driving mechanism is located in front of the second driving mechanism, and the first driving mechanism and the second driving mechanism are both used for pulling the fabric to move backward.

[0011] In the aforementioned cutting device, the first driving mechanism and the second driving mechanism both comprise a mounting plate located above the circular arc surface, the two sides of the mounting plate are fixed to the supporting plate, the bottom of the mounting plate is provided with a plurality of driving wheel assemblies distributed along the length direction of the notch, and the bottom of each driving wheel assembly is provided with a driving wheel.

[0012] In the aforementioned cutting device, the driving wheel assembly comprises a U-shaped wheel frame, the opening of the wheel frame faces downward, two driving wheels arranged in front and back are arranged in the wheel frame, the two driving wheels are connected to the wheel frame through a first driving shaft and a second driving shaft respectively, the two ends of the first driving shaft and the two ends of the second driving shaft both extend out of the outside of the wheel frame, one end of the first driving shaft is provided with a first pulley, one end of the second driving shaft is provided with a second pulley, the second pulley is connected to the first pulley through a first belt, the other end of the first driving shaft or the other end of the second driving shaft is provided with a third pulley, the wheel frame is provided with a first motor, the output end of the first motor is provided with a fourth pulley, and the fourth pulley is connected to the third pulley through a second belt.

[0013] In the aforementioned cutting device, the top of the wheel frame is provided with two guide shafts arranged in front and back, the outside of the guide shafts is provided with a guide pipe connected to the mounting plate, the guide pipe is provided with a limiting ring, the lower side of the limiting ring is provided with a spiral compression spring, the lower end of the compression spring is connected to the wheel frame, and the compression spring is sleeved on the outside of the guide pipe; the first motor is fixed to the top of the wheel frame and located between the two guide shafts.

[0014] In the aforementioned cutting device, all the first motors located in front of the notch rotate at the same speed, all the first motors located behind the notch rotate at the same speed, and the rotating speed of the first motor located in front of the notch is lower than that of the first motor located behind the notch.

[0015] The mounting plate of the first driving mechanism or the second driving mechanism is fixed with a second motor, the blade is long strip-shaped, one end of the blade is provided with a guide hole, one side of the guide hole is provided with a positioning disc fixed with the output end of the second motor, a sliding block fixed with the positioning disc is arranged in the guide hole, the other side of the guide hole is provided with a pressing plate connected with the sliding block through a sliding block screw, a plurality of straight triangle-shaped tooth grooves are arranged on one of the wide side walls of the guide hole, a groove is arranged on the side wall of the sliding block facing the tooth groove, a U-shaped spring is arranged in the groove, one end of the spring is fixed with the bottom surface of the groove, the other end of the spring is bent to form an inverted hook, and the inverted hook is inserted into one of the tooth grooves.

[0016] The upper side of the plane is provided with a roller shaft, the roller shaft is located at the front end of the supporting plate, bearings are arranged at both ends of the roller shaft, the bearings are connected with the supporting plate through a conversion plate, the top of the conversion plate is provided with a mounting groove for accommodating the bearings, and limiting plates for axially limiting the bearings are arranged on the two sides of the mounting groove.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] 1. The rotating blade cuts the fabric from the wide side, and the blade is not easy to blunt under the pressure at the blade edge during the cutting process, ensuring that the cutting of the hood is completely separated and the cutting effect is good.

[0019] 2. The fabric passes through the circular arc surface, and the rotation point of the blade is located on the axis of the circular arc surface, so that the blade cuts the fabric at a relatively uniform speed, ensuring good straightness of the cutting seam, thereby further improving the cutting effect. Moreover, when the fabric passes through the circular arc surface, it becomes arc-shaped, improving the vertical bending resistance, so that the cut end of the fabric is not easy to hang down and touch the inner wall of the slot, ensuring that the movement of the fabric is not hindered and reducing the failure rate of the device.

[0020] 3. Two driving mechanisms are arranged on the circular arc surface, the front driving mechanism is used to pull the fabric out of the full-automatic hood folding machine, and the rear driving mechanism is used to pull the cut fabric (finished hood), the rotation direction of the driving wheel at the bottom of the driving mechanism is parallel to the movement direction of the fabric, thereby providing traction for the fabric and effectively positioning the fabric in the width direction, preventing the fabric from slipping under the cutting force of the blade, ensuring smooth cutting and reducing the failure rate of the device.

[0021] 4), through the further structure optimization of the driving mechanism, the driving wheel can be lifted, and the pressure between the compression spring and the fabric passing below is always kept stable, first, to ensure that the fabric and the driving wheel establish stable friction force, ensure the smooth conveying of the fabric, reduce the failure rate of the device, second, to make the fabric of different thickness can pass from the bottom of the driving mechanism, improve the application range, second, when the sundries fall on the fabric and enter below the driving wheel with the fabric, avoid the driving wheel from being stuck, further reduce the failure rate of the device.

[0022] 5), all the first motors located on the same side of the notch keep the same speed of rotation, ensure that the fabric occurs wide offset during movement, prevent the fabric from being damaged and the device failure rate caused by hooking the accessory parts. The rotating speed of the first motor located in the front side of the notch is lower than that of the first motor located in the rear side of the notch, so that the rotating speed of the driving wheel located in the front side of the notch is lower than that of the driving wheel located in the rear side of the notch, so that the fabric located in the notch position is in a taut state, which is more beneficial to the blade to cut the fabric, and reduces the failure rate of the device.

[0023] 6), through the improvement of the connection structure between the second motor and the blade, every interval time, the screw on the pressing plate is slightly loosened, the blade can be moved, the fabric can be cut by using other positions of the blade, so that the blade can always cut the fabric in a sharp state, ensure smooth cutting, reduce the failure rate of the device, and the blade edge can be used, the overall service life of the blade is longer, and the production cost is reduced. At the same time, the blade can only move in one direction, so that the dull blade position on the blade cannot be used for fabric cutting again, further reducing the failure rate of the device.

[0024] In summary, the present application has the advantages of good cutting effect, low device failure rate and wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a top view of the cutting device.

[0026] Figure 2 is a bottom view of the cutting device.

[0027] Figure 3 is a top view of the cutting device.

[0028] Figure 4 is a right view of the cutting device.

[0029] Figure 5 is a front side perspective view of the driving wheel assembly.

[0030] Figure 6 is a rear side perspective view of the driving wheel assembly.

[0031] Figure 7is a top view of the cutting device at the second motor.

[0032] Figure 8 is a front view of the slider.

[0033] Figure 9 is a structural view of the roller end.

[0034] Figure 10 is an upside-down perspective view of the supporting plate.

[0035] The signs in the drawings are: 1 - supporting plate, 2 - bracket, 3 - flat surface, 4 - circular arc surface, 5 - bridging curved surface, 6 - slot, 7 - blade, 8 - first driving mechanism, 9 - second driving mechanism, 10 - mounting plate, 11 - driving wheel assembly, 12 - wheel frame, 13 - driving wheel, 14 - first driving shaft, 15 - second driving shaft, 16 - first pulley, 17 - second pulley, 18 - first belt, 19 - third pulley, 20 - first motor, 21 - fourth pulley, 22 - second belt, 23 - guide shaft, 24 - guide tube, 25 - limiting ring, 26 - compression spring, 27 - second motor, 28 - guide hole, 29 - positioning disc, 30 - slider, 31 - pressing plate, 32 - tooth groove, 33 - groove, 34 - spring, 35 - barb, 36 - roller shaft, 37 - bearing, 38 - adapter plate, 39 - mounting slot, 40 - limiting plate, 41 - guide bevel. DETAILED DESCRIPTION

[0036] The present application is further described below in conjunction with the drawings and examples, but is not limited to the basis of the application.

[0037] Example 1. The method of cutting a bib, the bib is cut at the rear end of the full-automatic bib folding machine, the blade 7 rotates from one side of the width of the fabric to the other side of the width of the fabric, and the bib is cut out. The rotation speed of the blade 7 and the moving speed of the fabric are fixed, and the angle between the rotation surface of the blade 7 and the moving direction of the fabric is controlled (as shown in A), so that the cutting seam formed by the blade 7 on the fabric is perpendicular to the length direction of the fabric. The size of the angle is inversely proportional to the moving speed of the fabric, and the size of the angle is proportional to the rotation speed of the blade 7. Figure 3

[0038] Example 2. The method of cutting a bib, the bib is cut at the rear end of the full-automatic bib folding machine, the blade 7 rotates from one side of the width of the fabric to the other side of the width of the fabric, and the bib is cut out. The angle between the rotation surface of the blade 7 and the moving direction of the fabric is fixed, and the proportion of the moving speed of the fabric or the cutting speed of the blade 7 is controlled, so that the cutting seam formed by the blade 7 on the fabric is perpendicular to the length direction of the fabric.

[0039] Example 3. The cutting device for realizing the method of cutting a bib described in Example 2, as shown in​Figure 1 As shown, it comprises a supporting plate 1 arranged at the rear end of the full-automatic bibs folding machine, the supporting plate 1 is connected to the frame of the full-automatic bibs folding machine through three supports 2, the top of the supporting plate 1 is provided with a horizontal plane 3, the rear side of the plane 3 is provided with a circular arc surface 4, the lowest part of the circular arc surface 4 is equal to or higher than the plane 3, the circular arc surface 4 and the plane 3 are gently transitioned through a bridging curved surface 5, the circular arc surface 4 is provided with an inclined notch 6, the rear side of the notch 6 is provided with a guide bevel 41, the guide bevel 41 is used to ensure that the fabric can smoothly pass through the notch 6, the two ends of the notch 6 respectively penetrate the two sides of the supporting plate 1 in the width direction, the upper side of the notch 6 is provided with a rotatable blade 7, the thickness of the blade 7 is 0.5-1mm less than the width of the notch 6, the rotation surface of the blade 7 penetrates the notch 6, and the rotation point of the blade 7 is located on the axis of the circular arc surface 4.

[0040] The two sides of the notch 6 are respectively provided with a first driving mechanism 8 and a second driving mechanism 9, the first driving mechanism 8 is located at the front side of the second driving mechanism 9, and the first driving mechanism 8 and the second driving mechanism 9 are both used to pull the fabric to move backward.

[0041] The first driving mechanism 8 and the second driving mechanism 9 both comprise a mounting plate 10 located above the circular arc surface 4, the two sides of the mounting plate 10 are fixed with the supporting plate 1, and the bottom of the mounting plate 10 is provided with a plurality of driving wheel assemblies 11 distributed along the length direction of the notch 6, and the bottom of the driving wheel assembly 11 is provided with a driving wheel 13.

[0042] The driving wheel assembly 11 comprises a U-shaped wheel frame 12, the opening of the wheel frame 12 faces downward, two driving wheels 13 arranged in front and back are arranged in the wheel frame 12, the two driving wheels 13 are connected with the wheel frame 12 through a first driving shaft 14 and a second driving shaft 15 respectively, the two ends of the first driving shaft 14 and the two ends of the second driving shaft 15 both extend out of the outer side of the wheel frame 12, one end of the first driving shaft 14 is provided with a first pulley 16, one end of the second driving shaft 15 is provided with a second pulley 17, the second pulley 17 is connected with the first pulley 16 through a first belt 18, the other end of the first driving shaft 14 is provided with a third pulley 19, the top of the wheel frame 12 is provided with a first motor 20, the output end of the first motor 20 is provided with a fourth pulley 21, and the fourth pulley 21 is connected with the third pulley 19 through a second belt 22. The first motor 20 drives the fourth pulley 21 to rotate, the fourth pulley 21 drives the third pulley 19 to rotate through the second belt 22, the third pulley 19 drives one of the driving wheels 13 to rotate through the first driving shaft 14, the third pulley 19 drives the first pulley 16 to rotate through the first driving shaft 14, the first pulley 16 drives the second pulley 17 to rotate through the first belt 18, the second pulley 17 drives the other driving wheel 13 to rotate through the second driving shaft 15, and the two driving wheels 13 keep the same rotating speed.

[0043] The top of the wheel frame 12 is provided with two front and rear arranged guide shafts 23, the outer side of the guide shaft 23 is provided with a guide pipe 24 connected with the mounting plate 10, the guide shaft 23 is in sliding connection with the guide pipe 24, the guide pipe 24 is provided with a limiting ring 25, the lower side of the limiting ring 25 is provided with a spiral compression spring 26, the lower end of the compression spring 26 is connected with the wheel frame 12, and the compression spring 26 is sleeved on the outer side of the guide pipe 24; the first motor 20 is located between the two guide shafts 23. The driving wheel 13 is pressed down through the compression spring 26, when the fabric passes through the circular arc surface 4, the friction between the driving wheel 13 and the fabric is established, and the fabric is driven to move backward, since the driving wheel 13 can be lifted, when the fabric accidentally falls on sundries, the fabric will not be stuck under the driving wheel 13, so that the equipment will not be out of order. The outer periphery of the driving wheel 13 is made of rubber material, so as to avoid the fabric from slipping.

[0044] All the first motors 20 located at the front side of the slot 6 rotate at the same speed, all the first motors 20 located at the rear side of the slot 6 rotate at the same speed, and the rotating speed of the first motor 20 located at the front side of the slot 6 is lower than that of the first motor 20 located at the rear side of the slot 6. All the first motors 20 are micro stepping motors, the rotating speed of the first motor 20 can be accurately adjusted after the first motor 20 is connected with the corresponding driver and the controller.

[0045] The mounting plate 10 of the first driving mechanism 8 or the second driving mechanism 9 is fixedly provided with a second motor 27, the second motor 27 is also a stepping motor, the blade 7 is in strip shape, one end of the blade 7 is provided with a guide hole 28, one side of the guide hole 28 is provided with a positioning disc 29, the positioning disc 29 is fixed with the output end of the second motor 27, the guide hole 28 is provided with a sliding block 30 fixed with the positioning disc 29, the other side of the guide hole 28 is provided with a pressing plate 31 screw-connected with the sliding block 30, one of the wide side walls of the guide hole 28 is provided with a plurality of tooth grooves 32 which are all right-angled triangles, the side wall of the sliding block 30 facing the tooth grooves 32 is provided with a groove 33, the groove 33 is provided with a U-shaped spring 34, one end of the spring 34 is fixed with the bottom surface of the groove 33, the other end of the spring 34 is bent to form a barb 35, and the barb 35 is inserted into one of the tooth grooves 32. The blade 7 can only slide in one direction along the sliding block 30 when the pressing plate 31 is not completely disassembled through the barb 35, so that the cutting point of the blade which has been blunt is not used again.

[0046] The upper side of the plane 3 is provided with a roller shaft 36, the roller shaft 36 is located at the front end of the supporting plate 1, both ends of the roller shaft 36 are provided with bearings 37, the bearings 37 are connected with the supporting plate 1 through a conversion plate 38, the top of the conversion plate 38 is provided with a mounting groove 39 accommodating the bearings 37, and both sides of the mounting groove 39 are provided with limiting plates 40 limiting the bearings 37 in the axial direction. The roller shaft 36 can be lifted in the mounting groove 39, and under the action of gravity, the roller shaft 36 is attached to the plane 3.

[0047] Working principle: the fabric from the full-automatic bib folding machine passes between the roller 36 and the plane 3, and then passes through the plane 3, the bridging curved surface 5 and the circular arc surface 4 in turn.

[0048] When the fabric passes through the first driving mechanism 8 and the second driving mechanism 9, the driving wheel 13 on the first driving mechanism 8 provides the fabric on the front side of the slot 6 with a driving force for moving backward, and the driving wheel 13 on the second driving mechanism 9 provides the fabric on the rear side of the slot 6 with a driving force for moving backward.

[0049] By adjusting the rotating speed of the first motor 20 on the front side of the slot 6, the fabric moving speed on the full-automatic bib folding machine is equal to or slightly lower than the rotating speed of the driving wheel 13 on the front side of the slot 6, so as to ensure that the discharging speed of the first driving mechanism 8 keeps up with the discharging speed of the full-automatic bib folding machine.

[0050] Since the rotating speed of the first motor 20 on the front side of the slot 6 is lower than the rotating speed of the first motor 20 on the rear side of the slot 6, the fabric at the slot 6 is in a taut state, and the fabric is more easily cut when being cut.

[0051] The second motor 27 drives the positioning disc 29 to rotate, the blade 7 is clamped between the pressing plate 31 and the positioning disc 29, and follows the positioning disc 29 to rotate, the blade 7 cuts the fabric once per rotation. The inclination of the blade 7, when the blade 7 cuts the fabric, the moving speed of the blade 7 in the moving direction of the fabric is the same as the moving speed of the fabric, so that the cutting seam formed by the blade 7 on the fabric is perpendicular to the length direction of the fabric. As shown in the figure, when the included angle between the rotating surface of the blade 7 and the moving direction of the fabric is fixed and the moving speed of the fabric is fixed, the moving speed of the blade 7 in the moving direction of the fabric can be changed by adjusting the rotating speed of the blade 7. Figure 1 ​

Claims

1. A cutting device for bibs, characterized in that: The application relates to a full-automatic bib folding machine, which comprises a supporting plate (1) arranged at the rear end of the full-automatic bib folding machine, the supporting plate (1) is connected with the rack of the full-automatic bib folding machine through a support (2), the top of the supporting plate (1) is provided with a horizontal plane (3), the rear side of the plane (3) is provided with a circular arc surface (4), the lowest part of the circular arc surface (4) is equal to or higher than the plane (3), the circular arc surface (4) and the plane (3) are gently connected through a bridging curved surface (5), the circular arc surface (4) is provided with an inclined notch (6), the two ends of the notch (6) penetrate through the two sides of the supporting plate (1) in the width direction, the upper side of the notch (6) is provided with a rotatable blade (7), the rotating surface of the blade (7) penetrates through the notch (6), and the rotating point of the blade (7) is located on the axis of the circular arc surface (4). The two sides of the notch (6) are respectively provided with a first driving mechanism (8) and a second driving mechanism (9), the first driving mechanism (8) is located at the front side of the second driving mechanism (9), and the first driving mechanism (8) and the second driving mechanism (9) are used for dragging the fabric to move backward. The first driving mechanism (8) and the second driving mechanism (9) both comprise a mounting plate (10) arranged above the circular arc surface (4), the two sides of the mounting plate (10) are fixed with the supporting plate (1), and the bottom of the mounting plate (10) is provided with a plurality of driving wheel assemblies (11) distributed along the length direction of the notch (6), and the bottom of the driving wheel assembly (11) is provided with a driving wheel (13). The mounting plate (10) of the first driving mechanism (8) or the second driving mechanism (9) is fixed with a second motor (27), the blade (7) is in a strip shape, one end of the blade (7) is provided with a guide hole (28), one side of the guide hole (28) is provided with a positioning disc (29), the positioning disc (29) is fixed with the output end of the second motor (27), the guide hole (28) is provided with a sliding block (30) fixed with the positioning disc (29), the other side of the guide hole (28) is provided with a pressing plate (31) screw-connected with the sliding block (30), one side wall of the guide hole (28) is provided with a plurality of tooth grooves (32) which are all in right-angled triangle shapes, the side wall of the sliding block (30) facing the tooth grooves (32) is provided with a groove (33), the groove (33) is provided with a U-shaped spring (34), one end of the spring (34) is fixed with the bottom surface of the groove (33), the other end of the spring (34) is bent to form a barb (35), and the barb (35) is inserted into one of the tooth grooves (32). The upper side of the plane (3) is provided with a roller shaft (36), the roller shaft (36) is located at the front end of the supporting plate (1), the two ends of the roller shaft (36) are both provided with a bearing (37), the bearing (37) is connected with the supporting plate (1) through a conversion plate (38), the top of the conversion plate (38) is provided with a mounting groove (39) for containing the bearing (37), and the two sides of the mounting groove (39) are both provided with a limiting plate (40) for limiting the bearing (37) in the axial direction. The bib is cut at the rear end of the full-automatic bib folding machine, the blade (7) is rotated to cut from one side of the fabric in the width direction to the other side of the fabric in the width direction, and the bib is cut. When the rotating speed of the blade (7) and the moving speed of the fabric are fixed, the cutting seam formed by the blade (7) on the fabric is perpendicular to the length direction of the fabric by controlling the included angle between the rotating plane of the blade (7) and the moving direction of the fabric, the size of the included angle is inversely proportional to the moving speed of the fabric, and the size of the included angle is proportional to the rotating speed of the blade (7). When the included angle between the rotating plane of the blade (7) and the moving direction of the fabric is fixed, the cutting seam formed by the blade (7) on the fabric is perpendicular to the length direction of the fabric by controlling the ratio of the moving speed of the fabric or the cutting speed of the blade (7).

2. The apparatus of claim 1, wherein: The driving wheel assembly (11) comprises a U-shaped wheel frame (12), the opening of the wheel frame (12) faces downward, two driving wheels (13) are arranged in front and back in the wheel frame (12), the two driving wheels (13) are connected with the wheel frame (12) through a first driving shaft (14) and a second driving shaft (15) respectively, the two ends of the first driving shaft (14) and the two ends of the second driving shaft (15) all extend out of the wheel frame (12), one end of the first driving shaft (14) is provided with a first pulley (16), one end of the second driving shaft (15) is provided with a second pulley (17), the second pulley (17) is connected with the first pulley (16) through a first belt (18), the other end of the first driving shaft (14) or the other end of the second driving shaft (15) is provided with a third pulley (19), a first motor (20) is arranged on the wheel frame (12), the output end of the first motor (20) is provided with a fourth pulley (21), the fourth pulley (21) is connected with the third pulley (19) through a second belt (22).

3. The apparatus of claim 2, wherein: The top of the wheel frame (12) is provided with two guide shafts (23) arranged in front and back, the outer side of the guide shaft (23) is provided with a guide pipe (24) connected with the mounting plate (10), the guide pipe (24) is provided with a limiting ring (25), the lower side of the limiting ring (25) is provided with a spiral compression spring (26), the lower end of the compression spring (26) is connected with the wheel frame (12), and the compression spring (26) is sleeved on the outer side of the guide pipe (24); the first motor (20) is fixed on the top of the wheel frame (12) and located between the two guide shafts (23).

4. The apparatus of claim 2, wherein: The first motor (20) located in the front side of the slot (6) rotates at the same speed, the first motor (20) located in the rear side of the slot (6) rotates at the same speed, and the rotating speed of the first motor (20) located in the front side of the slot (6) is lower than that of the first motor (20) located in the rear side of the slot (6).

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