Roll diameter measuring system

Abstract

The utility model provides a roll diameter measuring system that can accurately measure the diameter of a material roll on a rotating roller, so as to solve the problem of difficult and inaccurate measurement of material rolls in a vacuum, and relates to the field of measurement technology. The roll diameter measuring system includes a length measuring sensor, a position sensor, a controller, and a roller for collecting or unrolling strips; the roller is provided with a sensing structure, and the position sensor cooperates with the sensing structure to measure the rotation position of the roller; the length measuring sensor is arranged on the moving path of the strip to measure the moving length of the strip; the position sensor is electrically connected to the controller to provide the controller with a rotation position signal of the roller; the controller is electrically connected to the length measuring sensor. The utility model is conducive to more accurate control of the unwinding or winding speed of the strip.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, in particular to a roll diameter measuring system. Background Art

[0002] During the unwinding or winding process of the strip, as the thickness of the roll on the roller increases or decreases, the unwinding or winding speed of the roll will also change accordingly. In order to avoid the strip being broken or too loose during the production process, it is necessary to adjust the speed of the roller drive motor according to the diameter of the roll on the roller to adjust the speed of the roller and control the winding or opening speed of the strip to match it with the production line speed.

[0003] With the development of industrial modernization in the field of lithium battery new energy, there are more and more vacuum unwinding equipment. In a vacuum environment, ultrasonic waves cannot be transmitted, so it is difficult to use ultrasonic sensors to directly measure the diameter of the coil on the roller. Although the diameter of the coil can be calculated by using photoelectric sensors to measure the distance to the outer diameter of the coil and the distance to the center of the coil in a vacuum, this method is affected by the vacuum environment. The measurement data of the photoelectric sensor is unstable, and abnormal measurement data often jumps, affecting the accurate data reading of the PLC data. The higher the vacuum degree, the greater the abnormal measurement data jumps, and the vacuum pressure can easily damage the internal components of the photoelectric sensor, affecting the service life. In addition, the concentricity of the coil and the roller, and the roundness of the coil are greatly affected. In practice, it is difficult to ensure the concentricity of the coil and the roller, and the roundness of the coil is also difficult to ensure. Therefore, the current method mainly uses manual measurement of the coil diameter before the coil is installed on the equipment, and then inputs the diameter parameters of the coil into the equipment. The equipment obtains the current coil diameter through PLC virtual calculation during the production process. In practice, however, the tightness of the material rolls is different, especially for strips with a thickness of less than 0.1 mm, the calculated roll diameter deviation is also relatively large, which is difficult to meet production needs. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a roll diameter measuring system which can accurately measure the diameter of a material roll on a rotating roller, so as to solve the problem that the material roll is difficult to measure and the measurement is inaccurate, especially in a vacuum environment.

[0005] The utility model solves the technical problem by adopting the following technical solution: a coil diameter measuring system, including a length measuring sensor, a position sensor, a controller and a roller installed in a vacuum chamber for collecting or uncoiling the strip;

[0006] The rotating roller is provided with a sensing structure, and the position sensor cooperates with the sensing structure to measure the rotation position of the rotating roller;

[0007] The length measuring sensor is arranged on the moving path of the strip material to measure the moving length of the strip material;

[0008] The position sensor is electrically connected to the controller to provide the controller with a rotational position signal of the roller; the controller is electrically connected to the length measuring sensor to control the length measuring sensor according to the rotational position signal so as to measure the moving length of the strip within a corresponding time period when the roller rotates by a set angle, and receive the length data measured by the length measuring sensor to calculate the diameter of the material roll on the roller.

[0009] Furthermore, the controller is a PLC controller.

[0010] Furthermore, the length measuring sensor is a roller contact type length measuring sensor.

[0011] Furthermore, it also includes a tensioning mechanism arranged on the moving path of the strip for tensioning the strip.

[0012] Further, the strip is wound around the roller of the length measuring sensor, and the tensioning mechanism includes a first support roller and a second support roller, the first support roller is arranged in front of the length measuring sensor to support the strip toward the front of the roller of the length measuring sensor, the second support roller is arranged behind the length measuring sensor to support the strip toward the rear of the roller of the length measuring sensor, and the second support roller is arranged to float along its supporting direction by a spring.

[0013] Furthermore, it also includes a bracket, one end of the roller passes through the side wall of the vacuum chamber and extends to the outside of the vacuum chamber, the roller is rotatably matched with the side wall of the vacuum chamber and slidably matched along the axis direction of the roller, the outer end of the roller is sleeved with a sleeve that rotates and seals with the roller, and the sleeve is slidably connected with the bracket along the axis direction of the roller;

[0014] A bellows is provided between the sleeve and the side wall of the vacuum chamber, which is sleeved on the roller and has one end sealedly connected to one end of the sleeve and the other end sealedly connected to the side wall of the vacuum chamber;

[0015] The position sensor is mounted on the outer end of the rotating roller.

[0016] Furthermore, the position sensor is an angle sensor installed on the outer end of the roller.

[0017] Furthermore, the sleeve is sealed and matched with the outer end of the roller through a magnetic fluid sealing structure.

[0018] The beneficial effects of the utility model are as follows: the roll diameter measuring system of the utility model is provided with a sensing structure on the roller, a position sensor that cooperates with the sensing structure to measure the rotation position of the roller, and a length measuring sensor that is arranged on the moving path of the strip to measure the moving length of the strip. The position sensor and the length measuring sensor are both connected to the controller. When measuring the roll diameter, the controller can control the length measuring sensor to work accordingly through the position signal of the position sensor, so that it can measure the moving length of the strip in the corresponding time period of the set angle of the roller rotation, and then accurately calculate the real-time diameter of the roll on the roller according to the length. The roll diameter measuring system will not be affected by the shape of the roll and the coaxiality of the roll and the roller, and can accurately obtain the diameter of the roll on the roller, solving the problem that the diameter of the roll cannot be measured or is inaccurately measured under a vacuum environment, and is conducive to more accurate control of the unwinding or winding speed of the strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the installation of the length measuring sensor;

[0020] Figure 2 This is the installation diagram of the limit switch;

[0021] Figure 3 It is a schematic diagram of the system structure of the utility model;

[0022] Figure 4 It is a schematic diagram of the structure in which the roller extends out of the vacuum chamber;

[0023] Shown in the figure: rotating roller 1, material roll 2, length measuring sensor 4, position sensor 5, controller 6, strip 7, vacuum chamber 8, sleeve 9, bracket 10, protrusion 11, bellows 12, hydraulic cylinder 13, first support roller 31, second support roller 32, spring 33, side wall 81. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] like Figures 1 to 3As shown, the roll diameter measuring system of the utility model comprises a length measuring sensor 4, a position sensor 5, a controller 6 and a roller 1 installed in a vacuum chamber 8 for collecting or unwinding a strip 7. The roller 1 is provided with a sensing structure, and the position sensor 5 cooperates with the sensing structure to measure the rotation position of the roller 1; the length measuring sensor 4 is arranged on the moving path of the strip 7 to measure the shifting length of the strip 7; the position sensor 5 is electrically connected to the controller 6 to provide the controller 6 with a rotation position signal of the roller 1, and the controller 6 is electrically connected to the length measuring sensor 4 to control the length measuring sensor 4 according to the rotation position signal provided by the position sensor 5, so that the length measuring sensor 4 measures the moving length of the strip 7 in the corresponding time period when the roller 1 rotates at a set angle, and receives the length data of the length measuring sensor 4 to calculate the roll diameter on the roller 1. The rotation setting angle of the roller 1 can be set arbitrarily as needed, such as: 360 degrees, 60 degrees, etc., and can be set specifically through the function of the existing controller 6.

[0026] The specific principle of the roll diameter measuring system of the utility model is as follows: the position sensor 5 cooperates with the sensing structure provided on the roller 1 to measure the real-time rotation position of the roller 1, and transmits the rotation position signal of the roller 1 to the controller 6 in real time; the controller 6 controls the length measuring sensor 4 to work in real time according to the received real-time position signal, so that it measures the length of the corresponding strip 7 moving in the corresponding time period of the roller 1 rotating at a set angle; after measuring the length, the length measuring sensor 4 transmits the length data to the controller 6, and the controller 6 can calculate the diameter of the current roll 2 on the roller 1 by using its calculation function according to the length data. In this way, the speed of the roller driving motor can be adjusted accordingly according to the calculated diameter size, and the speed of the roller can be adjusted. The specific calculation principle of the diameter is: the length of the corresponding strip 7 moving in the corresponding time period of the roller 1 rotating at a set angle measured by the length measuring sensor 4 is the arc length of the roll 2 on the roller 1. According to the arc length formula of a circle, and considering the strip thickness of the roll 2, the diameter of the current roll 2 on the roller 1 can be calculated. The roll diameter measuring system will not be affected by the shape of the material roll 2 and the coaxiality between the material roll 2 and the roller 1, and can accurately obtain the diameter of the material roll on the roller 1. It can be applicable to strips of various thicknesses, and solves the problem that the diameter of the material roll 2 cannot be measured or is measured inaccurately under a vacuum environment, which is conducive to more accurate control of the unwinding or winding speed of the strip.

[0027] In the present invention, the controller 6 can be a PLC controller, a single chip microcomputer, etc. In the embodiment of the present invention, the controller 6 is a PLC controller. The rotation position of the roller 1 can be measured by an angle sensor, an angular displacement sensor, etc. That is, the position sensor 5 can be an angle sensor, an angular displacement sensor, etc. The sensing structure is specifically set according to the type of the position sensor 5. Figure 2 As shown, in one embodiment of the utility model, the rotation setting angle of the roller 1 is 360 degrees, that is, one circle, and the position sensor 5 is a limit switch. When the position sensor 5 is a limit switch, in order to facilitate the position sensor 5 to measure the rotation position of the roller 1, the sensing structure is a protrusion 11 set on the side of the roller 1. In this way, when the roller 1 is at the starting position of a circle, the protrusion 11 cooperates with the limit switch to make the limit switch actuated and output an electrical signal, indicating that the roller 1 is at the starting position of a circle. When the roller 1 is at the ending position of a circle, the protrusion 11 returns to its original position again after rotating one circle with the roller and cooperates with the limit switch to make the limit switch actuated and output an electrical signal. At this time, it indicates that the roller 1 is at the ending position of one circle and the starting position of the next circle. In this way, the controller 6 can determine when the roller 1 starts to rotate and when a circle ends according to the input signal of the limit switch, so as to control the length measuring sensor 4 when to measure and when to end the measurement according to the signal input by the limit switch, so as to measure the moving length of the strip 7 within the corresponding time period when the roller 1 rotates at a set angle of 360 degrees.

[0028] In some embodiments, a proximity switch is also used to measure the starting position and the ending position of the roller 1 after one rotation.

[0029] The length measuring sensor 4 can be a non-contact length measuring sensor or a contact length measuring sensor that can be used in a vacuum. In the present invention, in order to facilitate measurement, preferably, the length measuring sensor 4 is a roller contact length measuring sensor. In the embodiment of the present invention, the specific model of the length measuring sensor 4 is: LK-70 roller contact length measuring sensor of Wenzhou Tenglong Electronic Instrument Co., Ltd.

[0030] In order to more accurately measure the length of the strip moving within a corresponding time period when the roller 1 rotates at a set angle, the roll diameter measuring system further includes a tensioning mechanism disposed on the moving path of the strip 7 for tensioning the strip 7 .

[0031] In the embodiment of the utility model, Figure 1As shown, the strip 7 is wound around the roller of the length measuring sensor 4, and the tensioning mechanism includes a first support roller 31 and a second support roller 32. The first support roller 31 is arranged in front of the length measuring sensor 4 to support the strip 7 in front of the roller of the length measuring sensor 4, and the second support roller 32 is arranged behind the length measuring sensor 4 to support the strip 7 behind the roller of the length measuring sensor 4. The second support roller 32 is arranged to float along its supporting direction through a spring 33. In this way, when the speed of the roller 1 changes and causes the speed of the strip 7 to increase or decrease, the second support roller 32 can adaptively adjust the position of the second support roller 32 in the supporting direction (towards the rear of the roller of the length measuring sensor 4) by releasing or compressing the spring 33. By cooperating with the first support roller 31, the strip 7 can maintain an appropriate tension, which can not only make the strip and the roller more closely combined, but also make the data measured by the length measuring sensor 4 more accurate, and prevent the strip from being broken.

[0032] The position sensor 5 can be directly arranged in the vacuum chamber 8, but due to the vacuum environment of the vacuum chamber 8, the accuracy and life of ordinary sensors will be affected after being installed in the vacuum chamber 8, and special position sensors need to be purchased, which has high procurement costs and is difficult to purchase. Figure 4As shown, the utility model further includes a bracket 10, one end of the roller 1 passes through the side wall 81 of the vacuum chamber 8 and extends to the outside of the vacuum chamber 8, the roller 1 rotates with the side wall 81 of the vacuum chamber 8 and slides along the axial direction of the roller 1, so that the roller 1 can rotate relative to the side wall of the vacuum chamber 8 and slide along the axial direction of the roller 1, the outer end of the roller 1 is sleeved with a sleeve 9 that rotates with it and matches with it, and the sleeve 9 is slidably connected with the bracket 10 along the axial direction of the roller 1; a bellows 12 is sleeved on the roller 1 between the sleeve 9 and the side wall of the vacuum chamber 8, and one end is sealed and connected to one end of the sleeve 9, and the other end is sealed and connected to the side wall of the vacuum chamber 8; the position sensor 5 is installed on the outer end of the roller 1 (the end extending out of the side wall of the vacuum chamber 8). The above structure realizes the sealing of the roller 1 after passing through the side wall of the vacuum chamber 8 through the sleeve 9 and the bellows 12. In this way, the position sensor 5 can be installed on the outer end of the roller 1. The ordinary position sensor 5 can meet the requirements, which can reduce the procurement cost and make the subsequent maintenance of the system more convenient. The above structure can also compress or stretch the bellows 12 to move the position of the roller 1 along the axial direction of the roller 1, so as to adjust the position of the roller 1 according to the actual situation during the unwinding or rewinding process to ensure that the material roll on the roller is in the same straight line with the reeled or unwound strip. The position adjustment of the roller 1 can be achieved by the hydraulic cylinder 13. The sleeve 9 can be sealed with the outer end of the roller 1 through various existing sealing structures, such as: magnetic fluid sealing structure, rubber ring sealing structure, etc. In the present application, preferably, the sleeve 9 is sealed with the outer end of the roller 1 through a magnetic fluid sealing structure. The sleeve 9 is sealed with the outer end of the roller 1 through a magnetic fluid sealing structure, and the sealing effect is good, and the energy consumption caused by friction and wear can be reduced, which reduces the equipment operation cost and improves the equipment operation efficiency.

[0033] If the position sensor 5 adopts a limit switch or a proximity switch, the diameter cannot be measured when the roller just starts to rotate. It must rotate a full circle before it can be calculated. In addition, for a roll with a diameter of more than 200 mm, the waiting time is too long, which will affect the speed of the motor controlling the roller. For this reason, in the present utility model, preferably, the position sensor 5 is an angle sensor installed on the outer end of the roller 1. The position sensor 5 adopts an angle sensor to set the rotation angle of the roller 1 to one circle, such as 20 degrees. In this way, the current roll diameter can be measured in a shorter time, which is conducive to the motor to more accurately control the speed of the roller.

Claims

1. The roll diameter measuring system is characterized by: It comprises a length measuring sensor (4), a position sensor (5), a controller (6), and a roller (1) installed in a vacuum chamber (8) for collecting or unwinding a strip (7); The rotating roller (1) is provided with a sensing structure, and the position sensor (5) cooperates with the sensing structure to measure the rotation position of the rotating roller (1); The length measuring sensor (4) is arranged on the moving path of the strip (7) to measure the moving length of the strip (7); The position sensor (5) is electrically connected to the controller (6) to provide the controller (6) with a rotational position signal of the roller (1); the controller (6) is electrically connected to the length measuring sensor (4) to control the length measuring sensor (4) according to the rotational position signal so as to measure the moving length of the strip (7) within a corresponding time period when the roller (1) rotates by a set angle, and receives the length data measured by the length measuring sensor (4) to calculate the diameter of the material roll (2) on the roller (1).

2. The roll diameter measuring system according to claim 1, characterized in that: The controller (6) is a PLC controller.

3. The roll diameter measuring system according to claim 1, characterized in that: The length measuring sensor (4) is a roller contact type length measuring sensor.

4. The roll diameter measuring system according to claim 3, characterized in that: It also comprises a tensioning mechanism arranged on the moving path of the strip (7) for tensioning the strip (7).

5. The roll diameter measuring system according to claim 4, characterized in that: The strip (7) is wound around the roller of the length measuring sensor (4), and the tensioning mechanism comprises a first support roller (31) and a second support roller (32), wherein the first support roller (31) is arranged in front of the length measuring sensor (4) to support the strip (7) in front of the roller of the length measuring sensor (4), and the second support roller (32) is arranged behind the length measuring sensor (4) to support the strip (7) behind the roller of the length measuring sensor (4), and the second support roller (32) is arranged to float along its supporting direction by a spring (33).

6. The roll diameter measuring system according to any one of claims 1 to 5, characterized in that: It also comprises a bracket (10), one end of the roller (1) passes through the side wall of the vacuum chamber (8) and extends to the outside of the vacuum chamber (8), the roller (1) is rotatably matched with the side wall of the vacuum chamber (8) and is slidably matched along the axis direction of the roller (1), the outer end of the roller (1) is sleeved with a sleeve (9) which is rotatable and sealably matched with the roller, and the sleeve (9) is slidably connected to the bracket (10) along the axis direction of the roller (1); A bellows (12) is provided between the sleeve (9) and the side wall of the vacuum chamber (8), which is sleeved on the roller (1) and has one end sealedly connected to one end of the sleeve (9) and the other end sealedly connected to the side wall of the vacuum chamber (8); The position sensor (5) is mounted on the outer end of the rotating roller (1).

7. The roll diameter measuring system according to claim 6, characterized in that: The sleeve (9) is sealed with the outer end of the rotating roller (1) via a magnetic fluid sealing structure.

8. The roll diameter measuring system according to claim 1, characterized in that: The position sensor (5) is an angle sensor.

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