Winding and unwinding variable-diameter constant-speed control system and method thereof

Abstract

The invention relates to a winding and unwinding variable-diameter constant-speed control system and method. The winding and unwinding variable-diameter constant-speed control system comprises a winding and unwinding mechanism, a measuring assembly and a control terminal. The winding and unwinding mechanism comprises an unwinding assembly, a floating roller, a rotating wheel and a winding assembly, the unwinding assembly comprises an unwinding shaft and an unwinding servo motor used for driving the unwinding shaft to rotate, and the winding assembly comprises a winding shaft and a winding servo motor used for driving the winding shaft to rotate; the measuring assembly comprises a first diameter measuring sensor, a second diameter measuring sensor, a position sensor and a rotating speed sensor; the input ends of the control terminal are electrically connected to the output end of the first diameter measuring sensor, the output end of the second diameter measuring sensor, the output end of the position sensor and the output end of the rotating speed sensor in a one-to-one correspondence mode. Data support is provided for the control terminal through the measuring assembly, so that when the radius of the unwinding shaft and the radius of the winding shaft are changed, the rotating speed of the winding servo motor and the rotating speed of the unwinding servo motor are adjusted, and it is guaranteed that the linear speed of the unwinding shaft and the linear speed of the winding shaft are constant.

Description

Technical Field

[0001] The present invention relates to the technical field of coiled material punching, and in particular to a coil-reeling and rewinding variable diameter constant speed control system and method thereof. Background Art

[0002] Tipping paper is usually partially perforated. This allows ambient air to enter the filter during smoking, mixing with the smoke from the tobacco segments and reducing the amount of air inhaled. Tipping paper rolls are typically perforated mechanically, by laser, or by electrostatic punching.

[0003] In the related prior art, the punching equipment usually includes a winding and unwinding mechanism, which mainly includes a winding shaft and an unwinding shaft. There are three diameter states when the winding and unwinding mechanism is working. The first is that the diameter of the unwinding shaft is larger than the diameter of the winding shaft; the second is that the diameter of the unwinding shaft is smaller than the diameter of the winding shaft; and the third is that the diameter of the unwinding shaft is roughly equal to the diameter of the winding shaft. Since the diameters of the winding shaft and the unwinding shaft are constantly changing during operation, the rotation speeds of the winding shaft and the unwinding shaft must be equal. However, it is difficult for the punching equipment to ensure that the rotation speeds of the winding shaft and the unwinding shaft are equal. During the feeding process of the connecting paper roll, it is easy to cause paper breakage or loose rolls due to the mismatch of the feeding speeds of the winding and unwinding rolls. Summary of the Invention

[0004] Based on the above description, the present invention provides a rewinding and unwinding variable diameter constant speed control system and method thereof, aiming to solve the problem of paper breakage or loose rolls caused by the mismatch between the rotation speeds of the existing rewinding shaft and the unwinding shaft.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: In a first aspect, a reel-and-roll variable diameter constant speed control system comprises: The rewinding and unwinding mechanism includes a rewinding assembly, a floating roller, a rotating wheel, and an unwinding assembly. The rewinding assembly includes a rewinding shaft and a rewinding servo motor for driving the rewinding shaft to rotate. The unwinding assembly includes an unwinding shaft and an unwinding servo motor for driving the unwinding shaft to rotate. a measuring assembly comprising a first diameter measuring sensor, a second diameter measuring sensor, a position sensor, and a rotation speed sensor, wherein the first diameter measuring sensor is used to measure the radius of the unwinding shaft, the second diameter measuring sensor is used to measure the radius of the rewinding shaft, the position sensor is used to measure the position of the floating roller, and the rotation speed sensor is used to measure the actual linear speed of the rotating wheel; A control terminal, wherein each input end of the control terminal is electrically connected to the output end of the first diameter measuring sensor, the output end of the second diameter measuring sensor, the output end of the position sensor and the output end of the speed sensor in a one-to-one manner, and each output end of the control terminal is electrically connected to the servo driver of the unwinding servo motor and the servo driver of the winding servo motor in a one-to-one manner.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the first diameter measuring sensor and / or the second diameter measuring sensor is a laser ranging sensor.

[0008] Furthermore, the position sensor is a magnetic scale position sensor.

[0009] Furthermore, the rotation speed sensor is an encoder.

[0010] In a second aspect, a method for controlling a reel with a variable diameter and a constant speed is provided. The method is applied to the control terminal of the reel with a variable diameter and a constant speed control system according to the first aspect, and includes: Read the preset theoretical linear speed; Calculating a first winding pulse frequency of a servo driver of a winding servo motor according to a theoretical linear speed, and sending the first winding pulse frequency to the servo driver of the winding servo motor; Acquiring a first position of the floating roller, and determining whether the floating roller has reached a mark position according to the first position; When the floating roller reaches the mark position, the first winding pulse frequency is used as the unwinding pulse frequency corresponding to the servo driver of the winding servo motor and the theoretical linear speed, and the unwinding pulse frequency is sent to the servo driver of the unwinding servo motor.

[0011] Furthermore, after sending the unwinding pulse frequency to the servo driver of the unwinding servo motor, the method further comprises: Obtaining the actual linear speed of the rotational speed sensor; Determining whether the actual linear speed is equal to the theoretical linear speed; When the actual linear speed is equal to the theoretical linear speed, the first winding pulse frequency remains unchanged.

[0012] Furthermore, after determining whether the actual linear speed is equal to the theoretical linear speed, the method further comprises: When the actual linear speed is less than the theoretical linear speed, a second winding pulse frequency corresponding to the theoretical linear speed is calculated for the servo driver of the winding servo motor, and a first frequency difference between the second winding pulse frequency and the first winding pulse frequency is calculated, and the first frequency difference is used as an increment to be sent to the servo driver of the unwinding servo motor to increase the first winding pulse frequency; When the actual linear speed is greater than the theoretical linear speed, the third winding pulse frequency corresponding to the servo driver of the winding servo motor and the theoretical linear speed is calculated, and the second frequency difference between the third winding pulse frequency and the first winding pulse frequency is calculated. At the same time, the second frequency difference is sent as a decrement to the servo driver of the unwinding servo motor to reduce the first winding pulse frequency.

[0013] Furthermore, the calculation formulas for the first winding pulse frequency, the second winding pulse frequency and the third winding pulse frequency are as follows:

[0014] Where: V Tn is the theoretical linear velocity; N The pulse equivalent setting value of the servo driver of the unwinding servo motor; f ( R ) is the unwinding pulse frequency.

[0015] Furthermore, after sending the unwinding pulse frequency to the servo driver of the unwinding servo motor, the method further comprises: Acquiring a second position of the floating roller, and calculating a position difference between the second position and the flag position; Determine in which difference interval the position difference falls; When the position difference is within a first difference interval, reducing the frequency period of the unwinding pulse frequency by a first preset frequency period; When the position difference is within a second difference interval, the frequency period of the unwinding pulse frequency is increased by a second preset frequency period.

[0016] Furthermore, the determining of the difference interval in which the position difference falls includes: When the position difference is in the third difference interval, the frequency period of the first winding pulse frequency remains unchanged.

[0017] Compared with the existing technology, the technical solution of the present application has the following beneficial technical effects: by providing data support for the control terminal through the measurement component, when the radius of the unwinding shaft and the rewinding shaft changes, the rotational speed of the rewinding servo motor and the unwinding servo motor is adjusted to ensure that the linear speed of the unwinding shaft and the rewinding shaft is constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of a reel-winding and reel-winding variable-diameter constant-speed control system provided in an embodiment of the present invention; Figure 2 This is a circuit connection diagram of a reeling and unreeling variable diameter constant speed control system provided in an embodiment of the present invention; Figure 3 Schematic diagram of measuring the diameter of the reel in an embodiment of the present invention; Figure 4 This is a flow chart of a method for controlling a reel with a variable diameter and a constant speed provided in an embodiment of the present invention; Figure 5 This is a flow chart after S4 in an embodiment of the present invention; Figure 6 This is a flow chart after S4 in an embodiment of the present invention.

[0020] Description of reference numerals: 10. Rewinding and unwinding mechanism; 11. Rewinding shaft; 12. Floating roller; 13. Rotating wheel; 14. Unwinding shaft; 20. Measuring assembly; 21. First diameter measuring sensor; 22. Second diameter measuring sensor; 23. Position sensor; 24. Speed sensor; 30. Control terminal. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0023] It will be understood that spatial relational terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be understood that in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under" or "beneath" or "beneath" the other elements will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0024] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0025] Reference Figures 1 to 2 As shown, the present invention provides a technical solution: a winding and unwinding variable diameter constant speed control system, including a winding and unwinding mechanism 10, a measuring component 20 and a control terminal 30; the winding and unwinding mechanism 10 includes a winding component, a floating roller 12, a rotating wheel 13 and an unwinding component, the winding component includes a winding shaft 11 and a winding servo motor for driving the winding shaft 11 to rotate, the unwinding component includes an unwinding shaft 14 and an unwinding servo motor for driving the unwinding shaft 14 to rotate; the measuring component 20 includes a first diameter measuring sensor 21, a second diameter measuring sensor 22, a position sensor 23 and a speed sensor 24, the first diameter measuring sensor 21 is used to measure the radius of the unwinding shaft 14, the second diameter measuring sensor 22 is used to measure the radius of the winding shaft 11, the position sensor 23 is used to measure the position of the floating roller 12, and the speed sensor 24 is used to measure the actual linear speed of the rotating wheel 13; each input end of the control terminal 30 is electrically connected to the output end of the first diameter measuring sensor 21, the output end of the second diameter measuring sensor 22, the output end of the position sensor 23 and the output end of the speed sensor 24, and each output end of the control terminal 30 is electrically connected to the servo driver of the unwinding servo motor and the servo driver of the winding servo motor.

[0026] For example, the control terminal 30 may be a PLC controller, etc. A logo sticker may be provided on one side of the floating roller 12 as a marker.

[0027] In this embodiment, the measurement component 20 provides data support for the control terminal 30, so that when the radius of the unwinding shaft 14 and the rewinding shaft 11 changes, the rotation speed of the rewinding servo motor and the unwinding servo motor is adjusted to ensure that the linear speed of the unwinding shaft 14 and the rewinding shaft 11 is constant.

[0028] In some embodiments, the first diameter measurement sensor 21 and / or the second diameter measurement sensor 22 is a laser ranging sensor.

[0029] Reference Figure 3 As shown, the diameter measuring method of the first diameter measuring sensor 21 is: measuring the first distance from the lens of the first diameter measuring sensor 21 to the center of the winding shaft 11; measuring the second distance from the lens of the first diameter measuring sensor 21 to the surface of the winding paper tray; subtracting the first distance from the second distance to obtain the radius of the winding shaft 11.

[0030] The calculation formula of the radius of the unwinding shaft 14 is: R = X - Y ; Where: R is the radius of the reel 11; X is a first distance from the lens of the first diameter measuring sensor 21 to the center of the winding shaft 11; Y is the second distance from the lens of the first diameter measuring sensor 21 to the surface of the winding paper tray.

[0031] The diameter measuring method of the second diameter measuring sensor 22 is the same as that of the first distance measuring sensor; the radius calculation formula of the unwinding shaft 14 is the same as that of the rewinding shaft 11.

[0032] In some embodiments, the position sensor 23 is a magnetic scale position sensor. In other embodiments, the position sensor 23 may be a displacement sensor or the like.

[0033] In some embodiments, the speed sensor 24 is an encoder. In other embodiments, the speed sensor 24 can be a magnetoelectric speed sensor, a Hall-type speed sensor, or a photoelectric speed sensor.

[0034] Reference Figure 4 As shown, the present invention provides a technical solution: a method for controlling a reel with a variable diameter and a constant speed, the control method being applied to a control terminal of the reel with a variable diameter and a constant speed control system, comprising: S1, read the preset theoretical linear speed.

[0035] S2, calculating a first winding pulse frequency of a servo driver of the winding servo motor according to the theoretical linear speed, and sending the first winding pulse frequency to the servo driver of the winding servo motor.

[0036] The servo driver of the winding servo motor is driven according to the first winding pulse frequency. During startup, the servo driver of the winding servo motor starts according to the initial pulse frequency. During acceleration, the control terminal 30 transmits a preset incremental frequency to the servo driver of the winding servo motor, causing the servo driver of the winding servo motor to increase the preset incremental frequency until reaching the first winding pulse frequency and then operating stably at the first winding pulse frequency. The initial pulse frequency can be 100 P / T, and the preset incremental frequency can be 35 P / T.

[0037] S3, obtaining a first position of the floating roller 12, and determining whether the floating roller 12 reaches a mark position according to the first position.

[0038] S4, when the floating roller 12 reaches the mark position, the first winding pulse frequency is used as the unwinding pulse frequency corresponding to the servo driver of the winding servo motor and the theoretical linear speed, and the unwinding pulse frequency is sent to the servo driver of the unwinding servo motor.

[0039] When the floating roller 12 reaches the mark position, the servo driver of the unwinding servo motor starts to drive and follow until the unwinding pulse frequency is reached, so that the actual linear speed of the unwinding shaft 14 is the same as the actual linear speed of the rewinding shaft 11, ensuring that the rewinding shaft 11 and the unwinding shaft 14 can work at a constant speed.

[0040] Reference Figure 5 As shown, in some embodiments, after S4, the following steps are included: S511 , obtaining the actual linear velocity of the rotation speed sensor 24 .

[0041] S512, determining whether the actual linear velocity is equal to the theoretical linear velocity.

[0042] S513, when the actual linear speed is equal to the theoretical linear speed, the first winding pulse frequency remains unchanged.

[0043] During the stable operation stage, since the radius of the reel 11 and the radius of the unreel 14 are constantly changing, based on the changes in the radius of the reel 11 and the radius of the unreel 14, it is determined whether to increase or decrease the first reeling pulse frequency according to the relationship between the theoretical line speed and the actual line speed to ensure that the reel 11 and the unreel 14 can operate at a constant speed.

[0044] Reference Figure 5 As shown, in some embodiments, after S4, the following steps are included: S514, when the actual linear speed is lower than the theoretical linear speed, the second winding pulse frequency corresponding to the theoretical linear speed of the servo driver of the winding servo motor is calculated, and the first frequency difference between the second winding pulse frequency and the first winding pulse frequency is calculated, and the first frequency difference is sent as an increment to the servo driver of the unwinding servo motor to increase the first winding pulse frequency.

[0045] S515, when the actual linear speed is greater than the theoretical linear speed, calculate the third winding pulse frequency corresponding to the theoretical linear speed of the servo driver of the winding servo motor, and calculate the second frequency difference between the third winding pulse frequency and the first winding pulse frequency, and at the same time send the second frequency difference as a decrement to the servo driver of the unwinding servo motor to reduce the first winding pulse frequency.

[0046] In some embodiments, the calculation formulas for the first winding pulse frequency, the second winding pulse frequency, and the third winding pulse frequency are:

[0047] Where: V Tn is the theoretical linear velocity; N The pulse equivalent setting value of the servo driver of the unwinding servo motor; f ( R ) is the unwinding pulse frequency.

[0048] Reference Figure 6 As shown, in some embodiments, after S4, the following steps are included: S521, obtaining the second position of the floating roller 12, and calculating the position difference between the second position and the flag position.

[0049] S522, determining in which difference interval the position difference falls.

[0050] S523: When the position difference is within a first difference range, the frequency period of the unwinding pulse frequency is reduced by a first preset frequency period. For example, the first difference range may be 200 mm to 245 mm.

[0051] S524: When the position difference is within a second difference range, the frequency period of the unwinding pulse frequency is increased by a second preset frequency period. For example, the second difference range may be 245 mm to 255 mm.

[0052] The higher the speed of the unwinding shaft 14, the higher the height of the floating roller 12, and the lower the speed of the unwinding shaft 14, the lower the height of the floating roller 12. During the stable operation phase, the magnetic scale position sensor 23 monitors the position of the floating roller 12 in real time to determine the current speed of the unwinding shaft 14 and adjust the speed of the unwinding servo motor to ensure that the unwinding shaft 14 follows the rewinding shaft 11.

[0053] Reference Figure 6 As shown, in some embodiments, after S4, the following steps are included: S525: When the position difference is within a third difference range, the frequency period of the first winding pulse frequency remains unchanged. For example, the third difference range may be 255 mm to 300 mm.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reel-winding and rewinding variable diameter constant speed control system, characterized in that: include: A rewinding and unwinding mechanism (10) comprises a rewinding assembly, a floating roller (12), a rotating wheel (13) and an unwinding assembly, wherein the rewinding assembly comprises a rewinding shaft (11) and a rewinding servo motor for driving the rewinding shaft (11) to rotate, and the unwinding assembly comprises an unwinding shaft (14) and an unwinding servo motor for driving the unwinding shaft (14) to rotate; A measuring assembly (20) comprising a first diameter measuring sensor (21), a second diameter measuring sensor (22), a position sensor (23) and a rotation speed sensor (24), wherein the first diameter measuring sensor (21) is used to measure the radius of the unwinding shaft (14), the second diameter measuring sensor (22) is used to measure the radius of the rewinding shaft (11), the position sensor (23) is used to measure the position of the floating roller (12), and the rotation speed sensor (24) is used to measure the actual linear speed of the rotating wheel (13); A control terminal (30), wherein each input terminal of the control terminal (30) is electrically connected to the output terminal of the first diameter measuring sensor (21), the output terminal of the second diameter measuring sensor (22), the output terminal of the position sensor (23) and the output terminal of the speed sensor (24), and each output terminal of the control terminal (30) is electrically connected to the servo driver of the unwinding servo motor and the servo driver of the winding servo motor.

2. The rewinding and unwinding variable diameter constant speed control system according to claim 1 is characterized in that: The first diameter measuring sensor (21) and / or the second diameter measuring sensor (22) are laser distance measuring sensors.

3. The rewinding and unwinding variable diameter constant speed control system according to claim 1, characterized in that: The position sensor (23) is a magnetic scale position sensor (23).

4. The rewinding and unwinding variable diameter constant speed control system according to claim 1, characterized in that: The rotation speed sensor (24) is an encoder.

5. A method for controlling the diameter change and constant speed of a reel, characterized in that: The control method is applied to the control terminal (30) of the reeling and unreeling variable diameter constant speed control system according to any one of claims 1 to 4, comprising: Read the preset theoretical linear speed; Calculating a first winding pulse frequency of a servo driver of a winding servo motor according to a theoretical linear speed, and sending the first winding pulse frequency to the servo driver of the winding servo motor; Acquiring a first position of the floating roller (12), and judging whether the floating roller (12) has reached a mark position based on the first position; When the floating roller (12) reaches the mark position, the first winding pulse frequency is used as the unwinding pulse frequency corresponding to the servo driver of the winding servo motor and the theoretical linear speed, and the unwinding pulse frequency is sent to the servo driver of the unwinding servo motor.

6. The method for controlling the diameter change and constant speed of the reeling and unreeling according to claim 5, characterized in that: After sending the unwinding pulse frequency to the servo driver of the unwinding servo motor, the method includes: Obtaining the actual linear speed of the rotation speed sensor (24); Determining whether the actual linear speed is equal to the theoretical linear speed; When the actual linear speed is equal to the theoretical linear speed, the first winding pulse frequency remains unchanged.

7. The method for controlling the diameter change and constant speed of the rewinding and unwinding according to claim 6, characterized in that: After determining whether the actual linear speed is equal to the theoretical linear speed, the method further comprises: When the actual linear speed is less than the theoretical linear speed, a second winding pulse frequency corresponding to the theoretical linear speed is calculated for the servo driver of the winding servo motor, and a first frequency difference between the second winding pulse frequency and the first winding pulse frequency is calculated, and the first frequency difference is used as an increment to be sent to the servo driver of the unwinding servo motor to increase the first winding pulse frequency; When the actual linear speed is greater than the theoretical linear speed, the third winding pulse frequency corresponding to the servo driver of the winding servo motor and the theoretical linear speed is calculated, and the second frequency difference between the third winding pulse frequency and the first winding pulse frequency is calculated. At the same time, the second frequency difference is sent as a decrement to the servo driver of the unwinding servo motor to reduce the first winding pulse frequency.

8. The method for controlling the diameter change and constant speed of the rewinding and unwinding according to claim 7, characterized in that: The calculation formulas for the first winding pulse frequency, the second winding pulse frequency and the third winding pulse frequency are: Where: V Tn is the theoretical linear velocity; N The pulse equivalent setting value of the servo driver of the unwinding servo motor; f ( R ) is the unwinding pulse frequency.

9. The method for controlling the diameter change and constant speed of the rewinding and unwinding according to claim 5, characterized in that: After sending the unwinding pulse frequency to the servo driver of the unwinding servo motor, the method includes: Acquiring a second position of the floating roller (12), and calculating a position difference between the second position and the marker position; Determine in which difference interval the position difference falls; When the position difference is within a first difference interval, reducing the frequency period of the unwinding pulse frequency by a first preset frequency period; When the position difference is within a second difference interval, the frequency period of the unwinding pulse frequency is increased by a second preset frequency period.

10. The method for controlling the diameter change and constant speed of the rewinding and unwinding according to claim 9, characterized in that: After determining in which difference interval the position difference falls, the method further includes: When the position difference is in the third difference interval, the frequency period of the first winding pulse frequency remains unchanged.

Images