Method for controlling conveying platform to accurately convey EVA rubber sheets through multiple sections of balance wheels

Abstract

The invention relates to a method for controlling a conveying platform to accurately convey EVA (Ethylene Vinyl Acetate) rubber sheets by adopting multiple sections of balance wheels, which comprises the following steps of: firstly, setting rotating speeds of all balance wheels, and setting blanking and blanking directions; when a sheet enters, the photoelectric switch detects a sheet signal and transmits the signal to the controller, the controller controls the balance wheel to synchronously rotate to drive the sheet to move forwards, the balance wheel of the Nth balance wheel conveying platform starts to deflect and controls the balance wheel to synchronously rotate by a certain angle, so that the sheet moves in the left front direction or the right front direction until the sheet falls into the discharging and receiving part on one side, and the sheet is conveyed to the discharging and receiving part on the other side. Material receiving is completed; and the balance wheel of the Nth balance wheel conveying platform begins to reset after rotating by a certain angle to wait for the next discharging action. The automatic feeding device has the advantages that the design is ingenious, the structure is reasonable and compact, the at least two basic balance wheel conveying platforms and the at least one auxiliary balance wheel conveying platform which can operate independently are controlled through the controller, and automatic and stable feeding of EVA rubber sheets is achieved through cooperation of the multiple balance wheel conveying platforms, and the phenomena of scattering and the like are avoided.

Description

Technical Field

[0001] The invention relates to the field of EVA rubber sheet blanking, and in particular to a method for accurately conveying EVA rubber sheets by using a multi-section balance wheel to control a conveying platform. Background Art

[0002] EVA rubber sheet is a multifunctional, high-performance synthetic material that is widely used in various industries. With the advancement of technology and the growth of market demand, its application range will continue to expand.

[0003] At present, in the production process of EVA rubber sheets, the final molding is followed by conveying and unloading through a pendulum wheel conveyor platform. However, in the production process of EVA rubber sheets, some are long and some are short, and the unloading requirements of EVA rubber sheets of different lengths are different. The common pendulum wheel conveyor platform cannot meet the length change requirements, resulting in inaccurate unloading position and easy scattering. Manual sorting is required, which is time-consuming and labor-intensive and cannot meet production needs. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a method for accurately conveying EVA rubber sheets by using a multi-section balance wheel to control a conveying platform. The method has an ingenious design and a reasonable and compact structure, and can meet the precise unloading requirements of EVA rubber sheets of different lengths.

[0005] The technical solution of the present invention: A method for accurately conveying EVA rubber sheets by using a multi-stage balance wheel to control a conveying platform, the specific steps are as follows: Step 1: First, according to the length of the EVA rubber sheet, the controller is set to rotate at all balance wheel speeds through the human-machine interface; and the Nth balance wheel conveying platform is set to unload the material; the time required for unloading the EVA rubber sheet from the entrance to the balance wheel conveying platform is set to T1 seconds, and the waiting time after the equipment balance wheel rotates a certain angle is T2 seconds; Step 2: After the balance wheel conveying platform is started, the controller controls all the balance wheels to rotate synchronously to drive the EVA rubber sheet forward. When the EVA rubber sheet enters the first set of basic pendulum wheel conveying platforms, the photoelectric switch detects the EVA rubber sheet signal and transmits the signal to the controller. At the same time, the EVA rubber sheet passes under the wheel-shaped rotary encoder, and the wheel-shaped rotary encoder measures the length of the EVA rubber sheet and transmits the length measurement signal to the controller. The controller starts the set unloading thread and conveys the EVA rubber sheet to the Nth pendulum wheel conveying platform for unloading. After the EVA rubber sheet is advanced for T1 seconds, the controller controls the pendulum wheel of the Nth pendulum wheel conveying platform to synchronously rotate a certain angle, so that the EVA rubber sheet runs to the left front or right front direction until it falls into the unloading and receiving part on one side, completing the receiving; Step 3: The balance wheel of the Nth balance wheel conveying platform rotates a certain angle and then starts to reset after T2 seconds, waiting for the next unloading action.

[0006] The length of the EVA rubber sheet is an extended sheet, and the length of the extended sheet is the length of at least two sets of balance wheel conveying platforms. The time for the extended sheet to pass through at least two sets of balance wheel conveying platforms is T3, which is adjusted by adjusting the balance wheel rotation speed. At the same time, there are at least two sets of auxiliary balance wheel conveying platforms for unloading, and at least two sets of auxiliary balance wheel conveying platforms for unloading synchronously drive the balance wheel movement and the drive motor synchronously control the balance wheel deflection movement.

[0007] When each group of photoelectric switches detects the EVA rubber sheet leaving signal and the previous group of photoelectric switches does not detect the EVA sheet, the controller controls the previous group of pendulum conveying platforms to reset. At this time, the controller sets the unloading thread according to the EVA rubber sheet to control the corresponding pendulum conveying platform action. Different unloading threads are set for EVA rubber sheets of different lengths.

[0008] The two or more adjacent groups of basic balance wheel conveying platforms form a whole and rotate synchronously, and the two or more adjacent groups of auxiliary balance wheel conveying platforms form a whole and rotate synchronously.

[0009] The multi-stage balance wheel control conveying platform includes a balance wheel conveying platform, a photoelectric switch and a controller. The balance wheel conveying platform includes at least two groups of basic balance wheel conveying platforms and at least one group of auxiliary balance wheel conveying platforms; the at least two groups of basic balance wheel conveying platforms are connected end to end from back to front, and the at least one group of auxiliary balance wheel conveying platforms are also adjacent to the front side of the frontmost basic balance wheel conveying platform in sequence. The at least two groups of basic balance wheel conveying platforms and the at least one group of auxiliary balance wheel conveying platforms are all independently controlled balance wheel conveying platforms; the controller electrically controls and connects the at least two groups of basic balance wheel conveying platforms and the at least one group of auxiliary balance wheel conveying platforms respectively; a photoelectric switch is installed at one side of the entrance end of each group of balance wheel conveying platforms, and each group of photoelectric switches is electrically connected to the controller through a wire; a wheel-type rotary encoder is installed above the photoelectric switch of the first group of balance wheel conveying platforms, and the wheel-type rotary encoder is electrically connected to the controller through a wire; the controller also includes a human-machine interface, and the controller is electrically connected to the human-machine interface through a wire.

[0010] The basic balance wheel conveying platforms are provided in two groups, and the auxiliary balance wheel conveying platforms are provided in three groups or four groups.

[0011] The EVA rubber sheet multi-stage balance wheel controlled conveying platform also includes a material unloading and receiving part, which is installed on the front side of at least one group of auxiliary balance wheel conveying platforms or on one side or both sides of at least one group of auxiliary balance wheel conveying platforms and at least two groups of basic balance wheel conveying platforms.

[0012] The basic balance wheel conveying platform and the auxiliary balance wheel conveying platform have the same structure, both of which include a box, several groups of balance wheels, a driving motor, and a connecting rod assembly. Several groups of balance wheels are evenly installed in the box, and the driving motor drives the several groups of balance wheels uniformly through the connecting assembly; the controller electrically controls and connects each driving motor respectively; the balance wheels in the several groups of balance wheels are electric drum balance wheels, and each electric drum balance wheel is electrically connected to the controller through a wire; the driving motor adopts a servo motor.

[0013] The material unloading and receiving part includes a frame, a material receiving frame and a fence. The upper end of the frame is horizontally and tiltedly installed with a material receiving frame, and the frame is arranged on one side or both sides of the swing wheel conveying platform; the material receiving frame is tilted downward away from the swing wheel conveying platform; the material receiving frame is respectively installed with fences on the side and front side away from the swing wheel conveying platform; the material unloading and receiving part also includes a blower mechanism, which is installed on the side of the frame close to the swing wheel conveying platform, the blower mechanism is located above the material receiving frame, and the blowing port of the blower mechanism faces the side away from the swing wheel conveying platform; the blower mechanism includes a bellows and a support arm, a round tube is respectively installed on the inner side of each end of the bellows, the round tube is connected to the upper end of a support arm in a damped rotation manner, the lower end of the support arm is damped and rotationally installed on the frame, and a strip blowing port is arranged on the outer side of the bellows; downwardly inclined guide plates are respectively installed on both sides of the swing wheel conveying platform.

[0014] The frame is designed as an L-shaped frame, which includes a horizontal frame and a vertical frame. The material receiving rack is designed as a rectangular frame, one side of the material receiving rack is rotatably installed on the inner side of the vertical frame of the L-shaped frame, and the lower end of the other side of the material receiving rack is installed on the horizontal frame through a telescopic part, and the front telescopic end of the telescopic part is rotatably connected to the lower end of the other side of the material receiving rack, and the rear end of the telescopic part is rotatably connected to the inner side of one end of the horizontal frame close to the vertical frame; the material receiving rack is designed as a rectangular frame, and a plurality of vertical inverted U-shaped frames are evenly installed on the upper end of the rectangular frame, and gaps are left between adjacent vertical inverted U-shaped frames, and the outer opening of the gap faces the side away from the swing wheel conveying platform; a plurality of vertical through holes are evenly designed on the vertical inverted U-shaped frame, and two vertical through holes of adjacent vertical inverted U-shaped frames are The hole spacing is the same as the spacing between two adjacent vertical through holes on each vertical inverted U-shaped frame; a plurality of plug rods are installed at the lower end of the fence, and the spacing between adjacent plug rods is also the same as the spacing between two adjacent vertical through holes on each vertical inverted U-shaped frame; the fence is inserted left and right on the frontmost vertical inverted U-shaped frame through the plug rods, and the fence is inserted front and back into the outermost vertical through holes of adjacent vertical inverted U-shaped frames; the fence can also be inserted left and right on any vertical inverted U-shaped frame in the middle; the inner upper ends of the adjacent vertical inverted U-shaped frames are connected by a cross brace, and a guide rod is installed in the middle of the inner side of the cross brace, and the guide rod is parallel to the upper end of the vertical inverted U-shaped frame; the telescopic part is a telescopic cylinder, a telescopic oil cylinder or an electric telescopic cylinder.

[0015] The advantages of the present invention are ingenious design and reasonable and compact structure. At least two groups of independently operable basic pendulum conveying platforms and at least one group of auxiliary pendulum conveying platforms are controlled by a controller to independently drive and deflect one group of pendulum conveying platforms, or multiple groups of adjacent pendulum conveying platforms are combined to drive and deflect synchronously. The multiple groups of pendulum conveying platforms cooperate to realize automatic and smooth unloading of EVA rubber sheets of different lengths without scattering. The unloading and receiving part designs the receiving frame into an inclined structure. After the EVA rubber sheets fall onto the inclined receiving frame, they can automatically slide to the edge under the action of gravity inertia to be stacked in an orderly manner, thereby meeting production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the present invention Figure 1 .

[0017] Figure 2 It is a top view schematic diagram of the balance wheel conveying platform combination of the present invention.

[0018] Figure 3 It is a schematic diagram of electrical control connections of the controller of the present invention.

[0019] Figure 4 It is a schematic diagram of the driving motor of the swing wheel conveying platform of the present invention.

[0020] Figure 5 It is a simplified schematic diagram of a part of a driving connecting rod assembly at a driving motor of a swing wheel conveying platform of the present invention.

[0021] Figure 6 It is a three-dimensional schematic diagram of the present invention Figure 2 .

[0022] Figure 7 It is a partial three-dimensional schematic diagram of the material feeding and receiving portion of the present invention.

[0023] Figure 8 It is a partial front view schematic diagram of the material feeding and receiving portion of the present invention.

[0024] Fig. 9 It is a schematic diagram of a fence of a material unloading and receiving portion of the present invention. DETAILED DESCRIPTION

[0025] Refer to the attached Figure 1-5The multi-stage balance wheel control conveying platform includes a balance wheel conveying platform 4, a photoelectric switch 10, a wheel-shaped rotary encoder 50 and a controller 20. The balance wheel conveying platform 4 includes at least two groups of basic balance wheel conveying platforms 401 and at least one group of auxiliary balance wheel conveying platforms 402; the at least two groups of basic balance wheel conveying platforms 401 are connected end to end from back to front, and the at least one group of auxiliary balance wheel conveying platforms 402 are also adjacent to the front side of the frontmost basic balance wheel conveying platform 401. The auxiliary balance wheel conveying platforms 402 are all independently controlled balance wheel conveying platforms 4; the controller 20 electrically controls and connects at least two groups of basic balance wheel conveying platforms 401 and at least one group of auxiliary balance wheel conveying platforms 402; a photoelectric switch 10 is installed at one side of the entrance end of each group of balance wheel conveying platforms 401, and each group of photoelectric switches 10 is electrically connected to the controller 20 through a wire; a wheel-shaped rotary encoder 50 is installed above the photoelectric switch 10 of the first group of balance wheel conveying platforms, and the wheel-shaped rotary encoder 50 is electrically connected to the controller through a wire. The controller 20 also includes a human-machine interface 201, and the controller 20 is electrically connected to the human-machine interface 201 through a wire.

[0026] The basic balance wheel conveying platforms 401 are provided in two groups, and the auxiliary balance wheel conveying platforms 402 are provided in three or four groups.

[0027] The basic balance wheel conveying platform 401 and the auxiliary balance wheel conveying platform 402 have the same structure, both of which include a box 4011, several groups of balance wheels 4012, a driving motor 4013, and a connecting rod assembly 4014. Several groups of balance wheels 4012 are evenly installed in the box 4011, and the driving motor 4013 drives several groups of balance wheels 4012 uniformly through a connecting assembly; the controller 20 electrically controls and connects each driving motor 4013 respectively; the balance wheels in the several groups of balance wheels 4012 are electric drum balance wheels, and each electric drum balance wheel is electrically connected to the controller 20 through a wire; the driving motor 4013 adopts a servo motor. It is a prior art that the driving motor drives the connecting rod assembly to drive several groups of balance wheels to deflect, such as recorded in patent CN202020027388.5, and the present invention is briefly described.

[0028] The EVA rubber sheet multi-section balance wheel controlled conveying platform also includes a material unloading and receiving portion 30, which is installed on the front side of at least one group of auxiliary balance wheel conveying platforms 402 or on one side or both sides of at least one group of auxiliary balance wheel conveying platforms 402 and at least two groups of basic balance wheel conveying platforms 401.

[0029] See attached Figure 6-9The material receiving section 30 includes a frame 1, a receiving frame 2 and a fence 3. The upper end of the frame 1 is tilted horizontally and the receiving frame 2 is installed. The frame 1 is arranged on one side or both sides of the swing wheel conveying platform 4; the receiving frame 2 is tilted downward away from the swing wheel conveying platform 4; the receiving frame 2 is installed on the side away from the swing wheel conveying platform 4 and the front side. The receiving frame is tilted, so that the falling EVA rubber sheet slides obliquely downward under the action of gravity inertia, and the fence blocks it and arranges it in order, without manual sorting, reducing the labor level and improving production efficiency. The receiving section of the present invention is configured on both sides of the swing wheel conveying platform to form two left and right workstations, and both sides cooperate to receive materials at the same time to improve the material unloading efficiency. The material receiving section also includes a blower mechanism 5, which is installed on the side of the frame 1 close to the swing wheel conveying platform 4, and the blower mechanism 5 is located above the receiving frame 2, and the blowing port of the blower mechanism 5 faces the side away from the swing wheel conveying platform 4. The blower mechanism 5 comprises a bellows 51 and a support arm 52. A round tube is respectively installed on the inner side of both ends of the bellows 51. The round tube is connected to the upper end of a support arm 52 by damping rotation. The lower end of the support arm 52 is installed on the frame 1 by damping rotation. A strip blowing port 53 is arranged on the outer side of the bellows 51. The blower mechanism is designed to assist in blowing the EVA rubber sheet forward, so that the EVA rubber sheet falls to the required position, and assists in the material dropping more smoothly and neatly. The bellows can be rotated and adjusted relative to the support arm, and the support arm can also be rotated and adjusted relative to the frame. Since both are designed with damping rotation, they can rotate under the action of external force, and are fixed when not under force, ensuring that the adjusted blowing angle is stable. The round tubes of the bellows in the figure are connected by air pipes, and the air pipe input connection is connected at one end, which are all prior art. The present invention simply describes and illustrates them.

[0030] The frame 1 is designed as an L-shaped frame, which includes a horizontal frame 11 and a vertical frame 12. The receiving frame 2 is designed as a rectangular frame. One side of the receiving frame 2 is rotatably mounted on the inner side of the vertical frame 12 of the L-shaped frame. The lower end of the other side of the receiving frame 2 is mounted on the horizontal frame 11 through a telescopic portion 21. The front telescopic end of the telescopic portion 21 is rotatably connected to the lower end of the other side of the receiving frame 2, and the rear end of the telescopic portion 21 is rotatably connected to the inner side of one end of the horizontal frame 11 close to the vertical frame 12. The telescopic portion is a telescopic cylinder, a telescopic oil cylinder or an electric telescopic cylinder. The receiving frame is designed as an adjustable mounting structure. Through the telescopic action of the telescopic portion, the inclination angle of the receiving frame on the frame is adjusted to meet the blanking requirements of the EVA rubber sheet and ensure that it can be arranged in an orderly manner. Support feet can be designed under the horizontal frame of the frame for support and fixation.

[0031] The material receiving rack 2 is designed as a rectangular frame, and a plurality of vertical inverted U-shaped frames 22 are evenly installed on the upper end of the rectangular frame, and gaps 23 are left between adjacent vertical inverted U-shaped frames 22, and the outer opening of the gap 23 faces the side away from the swing wheel conveying platform 4; a plurality of vertical through holes 24 are evenly designed on the vertical inverted U-shaped frame 22, and the spacing between two vertical through holes 24 of adjacent vertical inverted U-shaped frames 22 is the same as the spacing between two adjacent vertical through holes 24 on each vertical inverted U-shaped frame 22; a plurality of insertion rods 31 are installed on the lower end of the fence 3, and the spacing between adjacent insertion rods 31 is also the same as the spacing between two adjacent vertical through holes 24 on each vertical inverted U-shaped frame 22; the fence 3 is inserted left and right on the frontmost vertical inverted U-shaped frame 22 through the insertion rods 31, and the fence 3 is inserted front and back in the outermost vertical through holes 24 of the adjacent vertical inverted U-shaped frames 22 through the insertion rods 31. The design of the gap 23 and the pluggable design of the fence make it convenient for a forklift to insert from the gap and take away the stacked sheets together; after taking them away, just plug the fence back. The fence 3 can also be inserted on any vertical inverted U-shaped frame 22 in the middle. The fence is inserted in the middle position of the material receiving rack on one side, which is more selected according to the size of different sheets, and the material receiving rack on one side can be divided into two material receiving stations. The fence is designed as a rectangular frame, and multiple vertical supports are used in the middle for vertical support. It is a prior art and is briefly described in the present invention. The inner upper ends of the adjacent vertical inverted U-shaped frames 22 are connected by a cross brace, and a guide rod 25 is installed in the middle of the inner side of the cross brace, and the guide rod 25 is parallel to the upper end of the vertical inverted U-shaped frame 22. The swing wheel conveying platform 4 is respectively provided with downwardly inclined guide plates 41 on both sides. The guide plate design assists the sheet material unloading to be smoother and more stable. The guide plate is located above the blower mechanism, and the blower mechanism cooperates with the blower to assist the guiding effect.

[0032] When the material unloading and receiving part of the present invention is in use, the swing wheel conveying platform conveys the EVA rubber sheets to the receiving racks on the left and right sides or one side in sequence. When the EVA rubber sheets fall from the swing wheel conveying platform, they can be firstly guided by the guide plate for unloading, and at the same time, the blower mechanism also assists the EVA rubber sheets in blowing outwards. The EVA rubber sheets continue to slide and fall above the receiving rack, and slide down along the inclined receiving rack under the action of their own gravity inertia, and are blocked by the fences on the outside and the front side, and are automatically adjusted to be neat. In this way, the materials are stacked in sequence. After completion, the fences on the outside are pulled out, and a forklift is used to insert the forklift into the gap set at the upper end of the receiving rack, and the stacked EVA rubber sheets are taken away by the upper support. The method is simple and convenient, reduces labor, improves production efficiency, and meets production needs.

[0033] A method for accurately conveying EVA rubber sheets by using a multi-stage balance wheel to control a conveying platform, the specific steps are as follows: Step 1: First, according to the length of the EVA rubber sheet, the controller is set to rotate at all balance wheel speeds through the human-machine interface; and the Nth balance wheel conveying platform is set to unload the material; the time required for unloading the EVA rubber sheet from the entrance to the balance wheel conveying platform is set to T1 seconds, and the waiting time after the equipment balance wheel rotates a certain angle is T2 seconds; Step 2: After the balance wheel conveying platform is started, the controller controls all the balance wheels to rotate synchronously to drive the EVA rubber sheet forward. When the EVA rubber sheet enters the first set of basic pendulum wheel conveying platforms, the photoelectric switch detects the EVA rubber sheet signal and transmits the signal to the controller. At the same time, the EVA rubber sheet passes under the wheel-shaped rotary encoder, and the wheel-shaped rotary encoder measures the length of the EVA rubber sheet and transmits the length measurement signal to the controller. The controller starts the set unloading thread and conveys the EVA rubber sheet to the Nth pendulum wheel conveying platform for unloading. After the EVA rubber sheet is advanced for T1 seconds, the controller controls the pendulum wheel of the Nth pendulum wheel conveying platform to synchronously rotate a certain angle, so that the EVA rubber sheet runs to the left front or right front direction until it falls into the unloading and receiving part on one side, completing the receiving; Step 3: The balance wheel of the Nth balance wheel conveying platform rotates a certain angle (between 0 and 90 degrees) and then starts to reset after T2 seconds, waiting for the next unloading action.

[0034] The length of the EVA rubber sheet is an extended sheet, and the length of the extended sheet is the length of at least two groups of balance wheel conveying platforms. The time for the extended sheet to pass through at least two groups of balance wheel conveying platforms is T3, which is adjusted by adjusting the rotation speed of the balance wheel. At the same time, there are at least two groups of auxiliary balance wheel conveying platforms for unloading, and at least two groups of auxiliary balance wheel conveying platforms for unloading synchronously drive the balance wheel movement and the drive motor synchronously controls the deflection movement of the balance wheel. When each group of photoelectric switches detects the EVA rubber sheet leaving signal, and the previous group of photoelectric switches does not detect the EVA sheet, the controller controls the previous group of balance wheel conveying platforms to reset. At this time, the controller sets the unloading thread according to the EVA rubber sheet to control the corresponding balance wheel conveying platform movement, and different lengths of EVA rubber sheets are set with different unloading threads. The adjacent two or more groups of basic balance wheel conveying platforms form an integrated and synchronously rotating action, and the adjacent two or more groups of auxiliary balance wheel conveying platforms form an integrated and synchronously rotating action. The wheel-type rotary encoder determines the length of the incoming EVA rubber sheet. The controller controls multiple sets of pendulum wheel conveying platform combinations to synchronously convey the EVA rubber sheet according to the length judgment, synchronously deflect the movement, and convey it to the receiving rack of the designated unloading and receiving part for receiving. The length of the receiving rack can be designed according to the length of the EVA rubber sheet. EVA rubber sheets of different lengths correspond to receiving racks of different lengths, and the unloading threads are also different to meet the needs of precise unloading.

Claims

1. A method for accurately conveying EVA rubber sheets by using a multi-stage balance wheel to control a conveying platform, characterized in that: The specific steps are as follows: Step 1: First, according to the length of the EVA rubber sheet, the controller is set to rotate at all balance wheel speeds through the human-machine interface; and the Nth balance wheel conveying platform is set to unload the material; the time required for unloading the EVA rubber sheet from the entrance to the balance wheel conveying platform is set to T1 seconds, and the waiting time after the equipment balance wheel rotates a certain angle is T2 seconds; Step 2: After the balance wheel conveying platform is started, the controller controls all the balance wheels to rotate synchronously to drive the EVA rubber sheet forward. When the EVA rubber sheet enters the first set of basic balance wheel conveying platforms, the photoelectric switch detects the EVA rubber sheet signal and transmits the signal to the controller. At the same time, the EVA rubber sheet passes under the wheel-shaped rotary encoder, and the wheel-shaped rotary encoder measures the length of the EVA rubber sheet and transmits the length measurement signal to the controller. The controller starts the corresponding unloading thread and conveys the EVA rubber sheet to the Nth balance wheel conveying platform for unloading. After the EVA rubber sheet is advanced for T1 seconds, the controller controls the balance wheel of the Nth balance wheel conveying platform to synchronously rotate a certain angle, so that the EVA rubber sheet runs to the left front or right front direction until it falls into the unloading and receiving part on one side to complete the receiving. Step 3: The balance wheel of the Nth balance wheel conveying platform rotates a certain angle and then starts to reset after T2 seconds, waiting for the next unloading action.

2. The method of using a multi-stage balance wheel to control a conveying platform to accurately convey EVA rubber sheets according to claim 1, characterized in that: The length of the EVA rubber sheet is an extended sheet, and the length of the extended sheet is the length of at least two sets of balance wheel conveying platforms. The time for the extended sheet to pass through at least two sets of balance wheel conveying platforms is T3, which is adjusted by adjusting the balance wheel rotation speed. At the same time, there are at least two sets of auxiliary balance wheel conveying platforms for unloading, and at least two sets of auxiliary balance wheel conveying platforms for unloading synchronously drive the balance wheel movement and the drive motor synchronously control the balance wheel deflection movement.

3. A method for accurately conveying EVA rubber sheets by using a multi-stage balance wheel to control a conveying platform according to claim 1 or 2, characterized in that: When each group of photoelectric switches detects the EVA rubber sheet leaving signal and the previous group of photoelectric switches does not detect the EVA sheet, the controller controls the previous group of pendulum conveying platforms to reset. At this time, the controller sets the unloading thread according to the EVA rubber sheet to control the corresponding pendulum conveying platform action. Different unloading threads are set for EVA rubber sheets of different lengths.

4. The method of using a multi-stage balance wheel to control a conveying platform to accurately convey EVA rubber sheets according to claim 2, characterized in that: The two or more adjacent groups of basic balance wheel conveying platforms form a whole and rotate synchronously, and the two or more adjacent groups of auxiliary balance wheel conveying platforms form a whole and rotate synchronously.

5. The method of using a multi-stage balance wheel to control a conveying platform to accurately convey EVA rubber sheets according to claim 1, characterized in that: The multi-stage balance wheel control conveying platform includes a balance wheel conveying platform, a photoelectric switch, a wheel-shaped rotary encoder and a controller. The balance wheel conveying platform includes at least two groups of basic balance wheel conveying platforms and at least one group of auxiliary balance wheel conveying platforms. The at least two groups of basic balance wheel conveying platforms are connected end to end from back to front, and the at least one group of auxiliary balance wheel conveying platforms are also adjacent to the front side of the frontmost basic balance wheel conveying platform in sequence. The at least two groups of basic balance wheel conveying platforms and the at least one group of auxiliary balance wheel conveying platforms are independently controlled balance wheel conveying platforms. The controller electrically controls and connects the at least two groups of basic balance wheel conveying platforms and the at least one group of auxiliary balance wheel conveying platforms respectively. A photoelectric switch is installed at one side of the entrance end of each group of balance wheel conveying platforms, and each group of photoelectric switches is electrically connected to the controller through a wire. A wheel-shaped rotary encoder is installed above the photoelectric switch of the first group of balance wheel conveying platforms, and the wheel-shaped rotary encoder is electrically connected to the controller through a wire. The controller also includes a human-machine interface, and the controller is electrically connected to the human-machine interface through a wire.

6. The method of using a multi-stage balance wheel to control a conveying platform to accurately convey EVA rubber sheets according to claim 5, characterized in that: The basic balance wheel conveying platforms are provided in two groups, and the auxiliary balance wheel conveying platforms are provided in three or four groups.

7. The method of using a multi-stage balance wheel to control a conveying platform to accurately convey EVA rubber sheets according to claim 5, characterized in that: The EVA rubber sheet multi-stage balance wheel controlled conveying platform also includes a material unloading and receiving part, which is installed on the front side of at least one group of auxiliary balance wheel conveying platforms or on one side or both sides of at least one group of auxiliary balance wheel conveying platforms and at least two groups of basic balance wheel conveying platforms.

8. The method of using a multi-stage balance wheel to control a conveying platform to accurately convey EVA rubber sheets according to claim 5, characterized in that: The basic balance wheel conveying platform and the auxiliary balance wheel conveying platform have the same structure, both of which include a box, several groups of balance wheels, a driving motor, and a connecting rod assembly. Several groups of balance wheels are evenly installed in the box, and the driving motor drives the several groups of balance wheels uniformly through the connecting assembly; the controller electrically controls and connects each driving motor respectively; the balance wheels in the several groups of balance wheels are electric drum balance wheels, and each electric drum balance wheel is electrically connected to the controller through a wire; the driving motor adopts a servo motor.

9. The method of using a multi-stage balance wheel to control a conveying platform to accurately convey EVA rubber sheets according to claim 7, characterized in that: The material unloading and receiving part includes a frame, a material receiving frame and a fence. The upper end of the frame is horizontally and tiltedly installed with a material receiving frame, and the frame is arranged on one side or both sides of the swing wheel conveying platform; the material receiving frame is tilted downward away from the swing wheel conveying platform; the material receiving frame is respectively installed with fences on the side and front side away from the swing wheel conveying platform; the material unloading and receiving part also includes a blower mechanism, which is installed on the side of the frame close to the swing wheel conveying platform, the blower mechanism is located above the material receiving frame, and the blowing port of the blower mechanism faces the side away from the swing wheel conveying platform; the blower mechanism includes a bellows and a support arm, a round tube is respectively installed on the inner side of each end of the bellows, the round tube is connected to the upper end of a support arm in a damped rotation manner, the lower end of the support arm is damped and rotationally installed on the frame, and a strip blowing port is arranged on the outer side of the bellows; downwardly inclined guide plates are respectively installed on both sides of the swing wheel conveying platform.

10. The method of using a multi-stage balance wheel to control a conveying platform to accurately convey EVA rubber sheets according to claim 7, characterized in that: The frame is designed as an L-shaped frame, which includes a horizontal frame and a vertical frame. The material receiving rack is designed as a rectangular frame, one side of the material receiving rack is rotatably installed on the inner side of the vertical frame of the L-shaped frame, and the lower end of the other side of the material receiving rack is installed on the horizontal frame through a telescopic part, and the front telescopic end of the telescopic part is rotatably connected to the lower end of the other side of the material receiving rack, and the rear end of the telescopic part is rotatably connected to the inner side of one end of the horizontal frame close to the vertical frame; the material receiving rack is designed as a rectangular frame, and a plurality of vertical inverted U-shaped frames are evenly installed on the upper end of the rectangular frame, and gaps are left between adjacent vertical inverted U-shaped frames, and the outer opening of the gap faces the side away from the swing wheel conveying platform; a plurality of vertical through holes are evenly designed on the vertical inverted U-shaped frame, and two vertical through holes of adjacent vertical inverted U-shaped frames are The hole spacing is the same as the spacing between two adjacent vertical through holes on each vertical inverted U-shaped frame; a plurality of plug rods are installed at the lower end of the fence, and the spacing between adjacent plug rods is also the same as the spacing between two adjacent vertical through holes on each vertical inverted U-shaped frame; the fence is inserted left and right on the frontmost vertical inverted U-shaped frame through the plug rods, and the fence is inserted front and back into the outermost vertical through holes of adjacent vertical inverted U-shaped frames; the fence can also be inserted left and right on any vertical inverted U-shaped frame in the middle; the inner upper ends of the adjacent vertical inverted U-shaped frames are connected by a cross brace, and a guide rod is installed in the middle of the inner side of the cross brace, and the guide rod is parallel to the upper end of the vertical inverted U-shaped frame; the telescopic part is a telescopic cylinder, a telescopic oil cylinder or an electric telescopic cylinder.

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