Unreeling control method and unreeling control mechanism for elastic membrane material

Abstract

The invention discloses an unwinding control method and an unwinding control mechanism for an elastic membrane material, and relates to the technical field of patch production equipment.The unwinding control method comprises the steps that according to a first time interval strategy, the first radius, measured by a distance measuring instrument, of an elastic membrane material roll is obtained; according to a second time interval strategy, the traction speed of the host is obtained, and a first rotating speed is calculated based on the traction speed and the first radius obtained in the current second time interval; and the rotating speed of an unwinding roller is adjusted based on the first rotating speed. The unwinding speed of the unwinding roller can be adjusted in time, so that the unwinding speed and the traction speed of a main machine are kept consistent or have small deviation, the unfolding effect of an elastic membrane material in the conveying and unfolding process is good, and the spraying effect of paint is good.

Description

Technical Field

[0001] The invention relates to the technical field of patch production equipment, and in particular to an unwinding control method and an unwinding control mechanism for an elastic film material. Background Art

[0002] In the patch production process, it is necessary to spray the ointment onto the elastic film material (such as elastic cloth, etc.), and the patch production equipment includes an unwinding roller, a winding roller, a traction roller, an auxiliary transmission device, etc. The rolled coil is installed on the unwinding roller, then unfolded and transmitted on the auxiliary transmission device, and then wound on the winding roller for winding, wherein the traction roller is used to provide power, drive the coil to move and control the moving speed of the coil (herein, it can be referred to as the traction speed of the main machine), and the coating is carried out during the coil transmission unfolding process. Because the elastic cloth has elasticity, it will be stretched by the tension, thereby affecting the coating effect. Therefore, the unwinding roller needs to adopt an active rotating roller, and unwinding is carried out in an active unwinding manner, so that the unwinding speed is as close as possible to the traction roller speed, so that the unwinding coil is neither stretched nor too loose. That is, the unwinding roller is driven by a motor to rotate so as to unwind, and when the unwinding speed is the same as the traction speed, the elastic cloth will not be too tight during the transmission process, nor will it be too loose. If the pulling speed is much greater than the unwinding speed, the elastic fabric will be stretched. When the stretching degree is large, it will affect the coating effect of the elastic fabric. When the unwinding speed is much greater than the pulling speed, the coil will relax or even droop, which will also affect the coating effect of the elastic fabric and even affect the transmission of the elastic fabric.

[0003] In the prior art, the speed of the unwinding roller is set according to the traction speed of the host, the thickness of the coil on the unwinding roller and the initial radius of the coil. For example, if the traction speed of the host is v, the thickness of the coil is b, and the initial radius of the coil is r, then the initial speed of the unwinding roller is set to n=v / 2πr. The radius will decrease by b every time the unwinding roller rotates one circle, that is, it is necessary to increase the speed every time the unwinding takes place for a period of time. For example, the speed of the unwinding roller can be adjusted once after every x turns. The speed will be changed to n=v / 2π(r-xb) at the next speed adjustment, and the speed will be changed to n=v / 2π(r-2xb) at the next speed adjustment, and so on. That is, the speed corresponding to each moment in the future is calculated in advance, and then the unwinding roller is unwound according to the speed calculated in advance at each moment. However, since the thickness of the coil may be uneven, the tightness of each circle of the coil winding may also be different, resulting in a deviation between the actual linear speed of the coil formed by this preset speed and the traction speed of the host. Moreover, as time goes by, this deviation will accumulate and become larger and larger, resulting in poor spraying effect of the paint, and manual real-time inspection and timely adjustment are required. Summary of the invention

[0004] The object of the present invention is to provide an unwinding control method and an unwinding control mechanism for an elastic film material, which can timely adjust the unwinding speed of the unwinding roller so that the unwinding speed is consistent with or has a small deviation from the traction speed of the main machine, thereby achieving a better unfolding effect of the elastic film material during the transmission and unfolding process, thereby achieving a better coating spraying effect.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] The present invention provides a method for controlling the unwinding of an elastic film material, comprising:

[0007] According to the first time interval strategy, obtaining a first radius of the elastic film material roll measured by the rangefinder;

[0008] According to the second time interval strategy, obtaining the traction speed of the host, and calculating the first rotation speed based on the traction speed and the first radius obtained in the current second time interval;

[0009] The rotation speed of the unwinding roller is adjusted based on the first rotation speed.

[0010] Optionally, before adjusting the rotation speed of the unwinding roller based on the first rotation speed, the method further includes obtaining a first tension of the elastic film material;

[0011] The adjusting the rotation speed of the unwinding roller based on the first rotation speed specifically includes:

[0012] Determining whether the first tension is within a first range;

[0013] If the first tension is within the first range, determining the first rotation speed as a second rotation speed;

[0014] If the first tension is less than the minimum value of the first range, reducing the first rotation speed by a first compensation value to obtain a second rotation speed;

[0015] If the first tension is greater than the maximum value of the first range, increasing the first rotation speed by a second compensation value to obtain a second rotation speed;

[0016] The rotation speed of the unwinding roller is adjusted based on the second rotation speed.

[0017] Optionally, the calculating the first rotation speed based on the traction speed and the first radius acquired in the current second time interval specifically includes:

[0018] Calculating the first rotation speed based on the latest first radius among the first radii acquired within the current second time interval and the traction speed;

[0019] Alternatively, the calculating the first rotation speed based on the traction speed and the first radius obtained in the current second time interval specifically includes:

[0020] Calculating a first average value of a plurality of first radii acquired within the current second time interval;

[0021] A first rotation speed is calculated based on the traction speed and the first average value.

[0022] Optionally, at least two distance meters are provided and used to measure the first radius of different positions of the elastic film roll;

[0023] The step of obtaining the first radius of the elastic film roll measured by the rangefinder specifically includes:

[0024] A second average value of the first radii measured by each of the rangefinders is obtained.

[0025] Optionally, calculating the first rotation speed according to the second time interval strategy specifically includes:

[0026] The first rotation speed is calculated once at a preset time interval; the preset time interval is a same time interval, or the preset time interval is a gradually decreasing time interval;

[0027] Alternatively, calculating the first rotation speed according to the second time interval strategy specifically includes:

[0028] The first rotation speed is calculated every time the unwinding roller rotates a certain number of times.

[0029] The present invention also provides an unwinding control mechanism for an elastic film material, comprising: a controller, a distance meter, a first motor and an unwinding roller, wherein the first motor is transmission-connected to the unwinding roller, and both the first motor and the distance meter are communication-connected to the controller; the distance meter is used to measure a first radius of the elastic film material roll in real time, and transmit the first radius to the controller, the controller calculates a first rotational speed based on the first radius and the acquired traction speed of the host, and controls the first motor to drive the unwinding roller to rotate based on the first rotational speed.

[0030] Optionally, at least two rangefinders are provided to measure the first radius at different positions of the elastic film roll.

[0031] Optionally, it further includes: a tension measuring instrument for measuring the tension of the elastic film material, the tension measuring instrument is communicatively connected with the controller, and the controller calculates the first rotation speed of the unwinding roller based on the tension, the first radius and the traction speed.

[0032] Optionally, it further comprises a photoelectric switch and an alarm, wherein the photoelectric switch and the alarm are both communicatively connected with the controller;

[0033] The photoelectric switch is used to illuminate the side of the elastic film material roll to detect whether the elastic film material roll is short of material.

[0034] Optionally, the rangefinder is a laser rangefinder or an ultrasonic rangefinder.

[0035] In the technical solution of the present invention, the first radius of the elastic film material roll is measured in real time, and the first rotational speed is calculated according to the first radius and the traction speed of the main machine, and the rotational speed of the unwinding roller is adjusted in time, so that the unwinding speed of the unwinding roller and the traction speed are always kept consistent or with a small deviation, so that the unfolding effect of the elastic film material during the transmission and unfolding process is better, thereby making the spraying effect of the paint better. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of a flow chart of an unwinding control method for an elastic film material;

[0037] Figure 2 It is a schematic diagram of a front view of an unwinding control mechanism for an elastic film material;

[0038] Figure 3 It is a schematic diagram of a top view of an unwinding control mechanism for an elastic film material.

[0039] In the figure, 1, unwinding roller; 2, elastic film roll; 3, tension measuring instrument; 4, traction roller; 5, distance meter; 6, alarm; 7, first motor; 8, second motor; 9, photoelectric switch; 10, frame. DETAILED DESCRIPTION

[0040] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples of devices or methods consistent with some aspects of the present invention.

[0041] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0042] The following is an explanation of the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention described in the claims. In addition, the entire contents of the configurations shown in the following embodiments are not limited to the solutions required as the invention described in the claims.

[0043] See also Figure 1 The present invention provides a method for controlling the unwinding of an elastic film. From a program perspective, the execution subject of the method may be a program on a controller mounted on a patch production device; from a hardware perspective, the execution subject of the process may be a controller of the patch production device. The method may include the following steps:

[0044] S101, obtaining a first radius of the elastic film material roll measured by a distance meter according to a first time interval strategy.

[0045] Here, obtaining the first radius of the elastic film roll measured by the rangefinder may refer to the rangefinder directly measuring the first radius and then sending it to the controller, which receives the first radius. It may also refer to the rangefinder measuring indirect data and then sending it to the controller, which calculates the first radius based on the indirect data.

[0046] See also Figure 2 , the distance between a certain point of the outermost layer of the elastic film roll 2 and the distance meter 5 along the radial direction of the unwinding roller 1 is a first distance d1, and the distance between the distance meter 5 and the axis of the unwinding roller 1 is a second distance d2. Then the first radius r = d2-d1, and the calculation process can be calculated by the distance meter 5 or by the controller.

[0047] When measuring the first distance d1, the rangefinder 5 can measure at its inherent frequency, for example, measuring once at a certain time interval, and this time interval is referred to as the third time interval herein. According to the first time interval strategy, it also means obtaining once at a certain time interval, and this time interval is referred to as the first time interval herein, and the first time interval may be equal to the third time interval, or may not be equal to the third time interval.

[0048] S103: Acquire the traction speed of the host according to the second time interval strategy, and calculate the first rotation speed based on the traction speed and the first radius acquired in the current second time interval.

[0049] The traction speed of the main machine is pre-set, and the worker sets the traction speed according to the needs. Specifically, the speed of the second motor 8 can be set so that the second motor 8 drives the traction roller 4 to rotate and then pulls the elastic film material to move. The actual moving speed of the elastic film material is relatively stable, which is basically the same as the set traction speed. According to the second time interval strategy, it also means that the first speed is calculated once every period of time, and the time periods separated are referred to as the second time interval here. The current second time interval refers to the second time interval closest to the moment of calculating the first speed. For example, the first speed needs to be calculated once at time a1, the first speed needs to be calculated once at time a2, and the first speed needs to be calculated once at time a3. Then, relative to time a2, the time period from time a1 to time a2 is the current second time interval. In this second time interval, the first radius r and the traction speed v are obtained, and the first speed n can be calculated by the following formula: n=v / 2πr. That is, the elastic film roll is calculated as a standard cylinder.

[0050] S105: Adjust the rotation speed of the unwinding roller based on the first rotation speed.

[0051] After the first rotation speed is calculated each time, the rotation speed of the unwinding roller 1 is adjusted. For example, the rotation speed of the unwinding roller 1 can be adjusted to the first rotation speed.

[0052] The method measures the first radius of the elastic film material roll in real time, calculates the first rotation speed according to the first radius and the traction speed of the main machine, and timely adjusts the rotation speed of the unwinding roller, so that the unwinding speed of the unwinding roller and the traction speed are always consistent or have a small deviation, thereby achieving a better unfolding effect of the elastic film material during the transmission and unfolding process, thereby achieving a better spraying effect of the paint.

[0053] Optionally, before adjusting the rotation speed of the unwinding roller based on the first rotation speed, the method further includes obtaining a first tension of the elastic film material;

[0054] The adjusting the rotation speed of the unwinding roller based on the first rotation speed specifically includes:

[0055] Determining whether the first tension is within a first range;

[0056] If the first tension is within the first range, determining the first rotation speed as the second rotation speed;

[0057] If the first tension is less than the minimum value of the first range, reducing the first rotation speed by a first compensation value to obtain the second rotation speed;

[0058] If the first tension is greater than the maximum value of the first range, increasing the first speed by a second compensation value to obtain the second speed;

[0059] The rotation speed of the unwinding roller is adjusted based on the second rotation speed.

[0060] During the transmission of the elastic film material, when the unwinding speed and the pulling speed differ for some reason, such as the elastic film material roll is not strictly cylindrical, and the unwinding is performed according to the calculated first rotation speed, the unwinding speed will deviate from the pulling speed. As time goes by, the deviation will accumulate, causing the elastic film material to be relaxed or stretched between the pulling roller 4 and the unwinding roller 1. Even if the subsequent unwinding speed is consistent with the pulling speed, the relaxed or stretched state cannot be eliminated. At this time, the tension measuring instrument 3 can be added to measure the first tension of the elastic film material between the pulling roller 4 and the unwinding roller 1. If the first tension is within the preset first range, it indicates that the elastic film material is neither too relaxed nor too stretched, and the coating can be sprayed on the elastic film material well. At this time, the unwinding roller 1 can be unwound at the first rotation speed.

[0061] When it is detected that the first tension is less than the minimum value of the first range, it indicates that the elastic film material is too loose, and the unwinding speed needs to be made less than the traction speed to eliminate the loose state of the elastic film material. At this time, a first compensation value can be subtracted from the first rotation speed to obtain a second rotation speed, so that the unwinding roller 1 unwinds at the second rotation speed. When the first tension recovers to the first range, unwinding is performed at the first rotation speed obtained by the latest calculation.

[0062] When it is detected that the first tension is greater than the maximum value of the first range, it indicates that the elastic film material is too tensioned, and the unwinding speed needs to be greater than the traction speed to eliminate the tensioned state of the elastic film material. At this time, a second compensation value can be added to the first speed to obtain a second speed, so that the unwinding roller 1 unwinds at the second speed. When the first tension recovers to within the first range, unwinding is performed at the first speed calculated most recently.

[0063] The first range, the first compensation value and the second compensation value can be specifically determined according to the specific performance of the elastic film material and the traction speed during spraying.

[0064] Optionally, the calculating the first rotation speed based on the traction speed and the first radius acquired in the current second time interval specifically includes:

[0065] Calculating the first rotation speed based on the latest first radius among the first radii acquired within the current second time interval and the traction speed;

[0066] Alternatively, the calculating the first rotation speed based on the traction speed and the first radius obtained in the current second time interval specifically includes:

[0067] Calculating a first average value of a plurality of first radii acquired within the current second time interval;

[0068] A first rotation speed is calculated based on the traction speed and the first average value.

[0069] The second time interval can be greater than or equal to the first time interval, that is, one or more first radii can be obtained within the second time interval. For example, if the first time interval is 100ms and the second time interval is 500ms, then 5 first radii can be obtained within the second time interval. At this time, the first radius obtained in 500s can be used to calculate the first rotational speed, or the first average value of the 5 first radii can be taken, and the first rotational speed can be calculated based on the first average value.

[0070] When the elastic film roll 2 is particularly close to a cylindrical shape, it is sufficient to take the most recently obtained first radius to calculate the first rotation speed.

[0071] When the elastic film roll 2 deviates from the cylindrical shape, for example, it is elliptical, then, within the second time interval, multiple first radii can be obtained, and the multiple first radii are the first radii at several positions of the elastic film roll 2. At this time, the first average value of these multiple first radii is taken to calculate the first rotation speed, which is more accurate.

[0072] Optionally, at least two distance meters are provided and used to measure the first radius of different positions of the elastic film roll;

[0073] The step of obtaining the first radius of the elastic film roll measured by the rangefinder specifically includes:

[0074] A second average value of the first radii measured by each of the rangefinders is obtained.

[0075] In order to reduce the calculation error when the elastic film roll 2 deviates from the cylindrical shape, multiple rangefinders 5 can be set to measure the first radius at different positions of the elastic film roll 2, so that multiple first radii can be measured at a certain moment, for example, r11 and r12, and multiple first radii can be measured at the next moment, r21 and r22. For a certain moment, the second average value of the multiple first radii at that moment is calculated, that is, r1 = (r11 + r12) / 2, r2 = (r21 + r22) / 2. In subsequent calculations, there will be several second average values ​​in a second time interval, which are r1 and r2. The average value of these several second average values ​​can be calculated as the first average value, that is, r = (r1 + r2) / 2, and then the first rotation speed is calculated with the first average value r.

[0076] Optionally, calculating the first rotation speed according to the second time interval strategy specifically includes:

[0077] The first rotation speed is calculated once at a preset time interval; the preset time interval is a same time interval, or the preset time interval is a gradually decreasing time interval;

[0078] Alternatively, calculating the first rotation speed according to the second time interval strategy specifically includes:

[0079] The first rotation speed is calculated every time the unwinding roller rotates a certain number of times.

[0080] The second time interval may be a preset fixed time interval, for example, every 500 ms is a second time interval, or may be a gradually decreasing time interval, for example, the second time interval is 500 ms at the beginning and becomes 400 ms after a period of time.

[0081] The second time interval can also be set based on the number of revolutions of the unwinding roller. For example, each revolution (two or three revolutions, etc.) of the unwinding roller is a second time interval. In this case, the second time interval is a variable time interval.

[0082] The present invention also provides an unwinding control mechanism for an elastic film material, see Figure 2 and Figure 3 , Figure 2 and Figure 3 For the simplified schematic diagram of the partial structure of the patch production equipment, in order to facilitate the present invention to be described more specifically, many parts on the patch production equipment are omitted in the figure. The unwinding control mechanism of the elastic film material is introduced below: including an unwinding roller 1 arranged on the frame 10 of the patch production equipment, the unwinding roller 1 is connected with a first motor 7, the first motor 7 drives the unwinding roller 1 to rotate and discharge, and the unwinding roller 1 is equipped with an elastic film material roll 2. A rangefinder 5 is provided on the frame 10 by a fixed frame, and the rangefinder 5 is used to measure the first radius of the elastic film material roll 2. A controller is also included, and the controller can be a controller used for the patch production equipment, specifically a PLC or a single-chip microcomputer, etc. The first motor 7 and the rangefinder 5 are both connected to the controller in communication; the rangefinder 5 is used to measure the first radius of the elastic film material roll in real time, and the first radius is transmitted to the controller, the controller calculates the first speed based on the first radius and the traction speed of the obtained host, and controls the first motor 7 to drive the unwinding roller 1 to rotate based on the first speed.

[0083] Optionally, at least two distance meters 5 are provided to measure the first radius at different positions of the elastic film roll 2 .

[0084] Optionally, a tension measuring instrument 3 is further included, and the tension measuring instrument 3 is used to measure the tension of the elastic film material. The tension measuring instrument 3 is in communication connection with the controller, and the controller calculates the first rotation speed of the unwinding roller based on the tension, the first radius and the traction speed.

[0085] Optionally, a photoelectric switch 9 and an alarm 6 are also included, and both the photoelectric switch 9 and the alarm 6 are connected to the controller for communication; the photoelectric switch 9 is used to illuminate the side of the elastic film roll 2 to detect whether the elastic film roll is short of material. The photoelectric switch 9 is specifically irradiated on the side of the elastic film roll 2 and close to the outer peripheral surface of the unwinding roller 1. In this way, when the radius of the elastic film roll 2 is large, the photoelectric switch 9 can illuminate the side of the elastic film roll 2. When the radius of the elastic film roll 2 is small, the photoelectric switch 9 cannot illuminate the side of the elastic film roll 2, indicating that there is a shortage of material at this time. At the same time, the controller receives the signal of the photoelectric switch 9 and controls the alarm 6 to alarm. The alarm 6 may include an alarm light and a horn. When the alarm is sounded, the alarm light flashes and the horn sounds. To remind the staff to prepare to change the roll.

[0086] Optionally, the rangefinder 5 may be a laser rangefinder or an ultrasonic rangefinder.

Claims

1. A method for controlling the unwinding of an elastic film, characterized in that: include: According to the first time interval strategy, obtaining a first radius of the elastic film material roll measured by the rangefinder; According to the second time interval strategy, obtaining the traction speed of the host, and calculating the first rotation speed based on the traction speed and the first radius obtained in the current second time interval; The rotation speed of the unwinding roller is adjusted based on the first rotation speed.

2. The unwinding control method of the elastic film material according to claim 1, characterized in that: Before adjusting the rotation speed of the unwinding roller based on the first rotation speed, the method further includes obtaining a first tension of the elastic film material; The adjusting the rotation speed of the unwinding roller based on the first rotation speed specifically includes: Determining whether the first tension is within a first range; If the first tension is within the first range, determining the first rotation speed as a second rotation speed; If the first tension is less than the minimum value of the first range, reducing the first rotation speed by a first compensation value to obtain a second rotation speed; If the first tension is greater than the maximum value of the first range, increasing the first rotation speed by a second compensation value to obtain a second rotation speed; The rotation speed of the unwinding roller is adjusted based on the second rotation speed.

3. The unwinding control method of the elastic film material according to claim 1, characterized in that: The calculating the first rotation speed based on the traction speed and the first radius obtained in the current second time interval specifically includes: Calculating the first rotation speed based on the latest first radius among the first radii acquired within the current second time interval and the traction speed; Alternatively, the calculating the first rotation speed based on the traction speed and the first radius obtained in the current second time interval specifically includes: Calculating a first average value of a plurality of first radii acquired within the current second time interval; A first rotation speed is calculated based on the traction speed and the first average value.

4. The unwinding control method of the elastic film material according to claim 1, characterized in that: At least two distance meters are provided and used to measure the first radius of the elastic film roll at different positions; The step of obtaining the first radius of the elastic film roll measured by the rangefinder specifically includes: A second average value of the first radii measured by each of the rangefinders is obtained.

5. The unwinding control method of the elastic film material according to claim 1, characterized in that: Calculating the first speed according to the second time interval strategy specifically includes: The first rotation speed is calculated once at a preset time interval; the preset time interval is a same time interval, or the preset time interval is a gradually decreasing time interval; Alternatively, calculating the first rotation speed according to the second time interval strategy specifically includes: The first rotation speed is calculated every time the unwinding roller rotates a certain number of times.

6. An unwinding control mechanism for an elastic film, characterized in that: include: A controller, a distance meter, a first motor and an unwinding roller, wherein the first motor is drivingly connected to the unwinding roller, and the first motor and the distance meter are both communicatively connected to the controller; The rangefinder is used to measure the first radius of the elastic film roll in real time and transmit the first radius to the controller. The controller calculates a first rotation speed based on the first radius and the acquired traction speed of the host, and controls the first motor to drive the unwinding roller to rotate based on the first rotation speed.

7. The unwinding control mechanism of the elastic film material according to claim 6, characterized in that: At least two distance meters are provided to measure the first radius at different positions of the elastic film roll.

8. The unwinding control mechanism of the elastic film material according to claim 6, characterized in that: Also includes: A tension measuring instrument for measuring the tension of the elastic film material, wherein the tension measuring instrument is in communication with the controller, and the controller calculates a first rotation speed of the unwinding roller based on the tension, the first radius and the traction speed.

9. The unwinding control mechanism of the elastic film material according to claim 6, characterized in that: It also includes a photoelectric switch and an alarm, wherein the photoelectric switch and the alarm are both communicatively connected with the controller; The photoelectric switch is used to illuminate the side of the elastic film material roll to detect whether the elastic film material roll is short of material.

10. The unwinding control mechanism of the elastic film material according to claim 6, characterized in that: The rangefinder is a laser rangefinder or an ultrasonic rangefinder.

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