Automatic roll changing device

Abstract

The utility model relates to an automatic roll changing device which comprises at least two unwinding mechanisms, a first movement mechanism, a pressing and cutting mechanism, a second movement mechanism, a detection system and a control system, and the unwinding mechanisms are used for supporting a winding drum and driving the winding drum to rotate; the first movement mechanism is used for installing the unwinding mechanism and enabling the unwinding mechanism to revolve to an unwinding station and a loading station, the pressing and cutting mechanism is used for pressing new and old material coils together and cutting off tailings of the old material coils, the second movement mechanism is used for driving the pressing and cutting mechanism to reach and leave a pressing and cutting position, and the detection system comprises a first sensor. The first sensor is used for measuring the distance between the winding drum and the peripheral face of the material roll. The automatic coil cutting device can automatically cut coils and accurately detect the coil diameter of the material coil at the unwinding station.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an automatic roll changing device. Background Art

[0002] The unwinding mechanism of the current lithium battery industry coating machine is a double-station flip mechanism automatic unwinding mechanism, which realizes automatic roll change without stopping the machine or slowing down. The roll diameter of the material roll at the unwinding station is detected in real time by the sensor. If the roll diameter of the material roll at the unwinding station reaches the set value, the old material roll is switched to the loading station and the new material roll is switched to the unwinding station. Then, the tail part of the old material roll is joined with the starting part of the new material roll, and the tail end of the old material roll is cut off to complete the unwinding and roll change.

[0003] At present, the industry generally adopts the following methods to determine the timing of roll change and roll cutting:

[0004] The first method of determining the timing of reel change is to detect the reel diameter through an ultrasonic sensor. The ultrasonic sensor continuously detects the distance between the sensor and the outer circumference of the material reel, and monitors the corresponding value of the ultrasonic sensor during the continuous unwinding process of the material reel through the human-machine interface. The current real-time reel diameter is calculated through a linear ratio, and the ultrasonic sensor detection accuracy is ±2mm. However, in the actual production process, the reel chuck will vibrate, and the consistency of the circular runout of the reel itself will also fluctuate, resulting in errors in the detection, and the detection accuracy is reduced to ±3mm. Therefore, the ultrasonic reel diameter detection can only be used as a warning information for material shortage, and production staff cannot use the reel diameter information on the display screen to cut the reel.

[0005] The second method of judging the timing of reel change is to detect the reel diameter through a color mark sensor. A fixed color mark is made on the reel of the unwinding mechanism, and this mark needs to be aligned when gluing. The color mark sensor senses the color mark and executes the reel change action. The control system calculates the reel diameter value based on the number of color marks detected by the sensor and the tape speed. The disadvantage of this method is that the accuracy of manual gluing cannot be fully controlled, and the mounting bracket of the color mark sensor will produce a certain degree of deviation due to vibration during operation, resulting in a large deviation in the detection accuracy of the color mark sensor.

[0006] Coil cutting method: In order to ensure that the tail of the material roll is wasted as little as possible, the unwinding operator generally uses visual and touch the roll to determine the timing of cutting. The existing method is affected by the personal experience of the personnel. Different operators have different lengths of tails left after cutting the roll. Those with insufficient experience are likely to cause a large amount of material roll waste. The tail at the bottom of the process roll is difficult to control, and personnel need to frequently enter the safety fence to touch the roll, which poses a safety risk.

[0007] How to safely cut the roll and accurately detect the roll diameter of the material roll at the unwinding station is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0008] To this end, the present utility model provides an automatic roll changing device that can automatically cut and wind and accurately detect the roll diameter of the material roll at the unwinding station.

[0009] To solve the above technical problems, the present utility model provides an automatic roll changing device, comprising:

[0010] At least two unwinding mechanisms, which are used to support the reel and drive the reel to rotate around the first axis;

[0011] A first motion mechanism, which is used to install the at least two unwinding mechanisms and drive the unwinding mechanism carrying the new material roll to revolve around the second axis to the unwinding station and drive the unwinding mechanism carrying the old material roll to revolve around the second axis to the loading station. The starting part of the new material roll at the unwinding station can rotate with the reel to the tape connecting position, and the joint part of the old material roll at the loading station can pass through the tape connecting position during the unwinding process;

[0012] A pressing and cutting mechanism, which is used to press the starting part of the new material roll at the unwinding station and the joint part of the old material roll at the loading station together and cut off the tail material of the old material roll at the loading station;

[0013] A second motion mechanism, which is used to drive the pressing and cutting mechanism to reach and leave the pressing and cutting position;

[0014] A detection system, which includes a first sensor, and the first sensor is used to measure the distance between the outer peripheral surface of the reel and the outer peripheral surface of the material roll on the reel;

[0015] A control system, which receives the detection data of the detection system and controls the unwinding mechanism, the first motion mechanism, the pressing and cutting mechanism and the second motion mechanism;

[0016] Wherein, both the first axis and the second axis are parallel to the first direction.

[0017] Further, the first sensor is a multi-point laser sensor, the lens of the multi-point laser sensor faces the second direction, and the second direction forms an angle with the first direction.

[0018] Further, the unwinding mechanism includes a reel bracket, a reel support and a reel driving device. The reel bracket is installed on the first motion mechanism. The reel support is rotatably connected to the reel bracket around the first direction, and at least part of the reel support is radially telescopic. The reel support is used to support and position the reel, and the reel driving device drives the reel support to rotate around the first axis of the reel it supports.

[0019] Further, the first sensor is installed on the reel bracket.

[0020] Further, the first motion mechanism includes a swing arm bracket, a swing arm, and a rotation driving device. The middle position of the swing arm is rotatably connected to the swing arm bracket around the second axis. The rotation driving device drives the swing arm to rotate around the second axis. Two of the unwinding mechanisms are respectively installed at both ends of the swing arm.

[0021] Further, the pressing and cutting mechanism includes a pressing roller and a rotary cutter. The pressing roller is used to press the starting part of the new material roll at the unwinding station and the joint part of the old material roll at the loading station together. The rotary cutter is used to cut off the tail material of the old material roll at the loading station.

[0022] Further, the second motion mechanism includes a swing arm bracket, a swing arm, and a swing driving device. One end of the swing arm is rotatably connected to the swing arm bracket around the third axis. The pressing and cutting mechanism is installed at the other end of the swing arm. The swing driving device drives the swing arm to swing around the third axis. The third axis is parallel to the first direction.

[0023] Further, the detection system further includes a second sensor. The second sensor is used to measure whether the starting part of the new material roll reaches the tape connecting position. The second sensor is installed on the swing arm bracket.

[0024] Further, the second sensor is a color mark sensor. The color mark sensor is used to detect whether the tape on the starting part of the new material roll at the unwinding station reaches the tape connecting position.

[0025] Further, the detection system further includes a third sensor. The third sensor is used to measure whether the pressing and cutting mechanism reaches the above-mentioned pressing and cutting position. The third sensor is an opposed grating. The third sensor is installed on the swing arm.

[0026] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0027] 1) For the automatic roll changing device of the present utility model, on the one hand, by using the pressing and cutting mechanism to press the new and old material rolls and cut the old material roll, the problem that manual roll cutting requires frequent entry into the safety guardrail to touch the reel is solved, achieving cost reduction and efficiency improvement. On the other hand, by using the first sensor to detect the distance between the reel and the outer peripheral surface of the material roll on the reel to judge the roll changing timing, this detection method does not detect the roll diameter of the material roll, but only detects the height difference between the outer circle of the material roll and the reel. Therefore, it is not affected by the circular runout of the reel and manual tape sticking, and can accurately detect the thickness of the material roll, providing a reliable judgment basis for the material roll switching station and roll cutting, and ensuring that the tail material of the old material roll after roll cutting is controlled within a lower range;

[0028] 2) For the automatic roll changing device of the present utility model, the first sensor is set as a multi-point laser sensor. One sensor can complete the detection that was previously achieved by multiple sensors, and the detection accuracy is relatively high.

[0029] 3) For the automatic roll changing device of the present utility model, the unwinding mechanism includes a reel bracket, a reel support member, and a reel driving device, which facilitates the replacement of the reel on the unwinding mechanism, and the unwinding mechanism can actively unwind the reel.

[0030] 4) For the automatic roll changing device of the present utility model, the first sensor is installed on the reel bracket. The distance between the first sensor and the reel and the coil is neither too far nor too close. The first sensor will not interfere with the movement of the unwinding mechanism, and the first sensor can more easily detect the coil on the reel.

[0031] 5) For the automatic roll changing device of the present utility model, the first motion mechanism includes a swing arm bracket, a swing arm, and a rotation driving device. The swing arm can drive the unwinding mechanism to revolve synchronously, and can realize the switching between the new coil and the old coil at the unwinding station and the loading station.

[0032] 6) For the automatic roll changing device of the present utility model, the pressing and cutting mechanism includes a pressure roller and a rotary cutter. The pressure roller can roll and contact the starting part of the new coil and the joint part of the old coil. When pressing, it will not affect the unwinding action of the new coil and the old coil, and the rotary cutter can cut the coil better.

[0033] 7) For the automatic roll changing device of the present utility model, the second motion mechanism includes a swing arm bracket, a swing arm, and a swing driving device, which can drive the pressing and cutting mechanism to approach and move away from the coil, and realize the pressing of the starting part of the new coil and the joint part of the old coil and the cutting of the old coil.

[0034] 8) For the automatic roll changing device of the present utility model, by setting the second sensor, it is detected whether the starting part of the new coil reaches the tape connecting position, so as to provide a reliable judgment basis for the pressing and cutting action of the pressing and cutting mechanism, and further ensure that the tail material of the old coil after cutting is controlled within a lower range.

[0035] 9) For the automatic roll changing device of the present utility model, a tape is adhered to the starting part of the new coil. By detecting the tape of the new coil through a color mark sensor, it can accurately detect whether the starting part of the new coil reaches the tape connecting position.

[0036] 10) For the automatic roll changing device of the present utility model, by setting the third sensor, the relative distance between the pressing and cutting mechanism and the coil can be detected, so as to ensure that the pressing and cutting mechanism can successfully press the starting part of the new coil and the joint part of the old coil and cut the old coil. Description of the Drawings

[0037] To make the content of the present utility model easier to be clearly understood, the following further elaborates on the present utility model in detail according to specific embodiments of the present utility model in conjunction with the accompanying drawings.

[0038] Figure 1 It is a schematic diagram of the automatic roll changing device in the present utility model;

[0039] Figure 2 It is a schematic structural diagram of the unwinding mechanism in the present utility model;

[0040] Figure 3 It is a connection schematic diagram of the swing arm and the pressing and cutting mechanism in the utility model.

[0041] Explanation of the reference numerals in the specification drawings: 11, reel; 12, material roll; 21, unwinding station; 22, loading station; 3, unwinding mechanism; 31, reel support; 32, reel support member; 4, first motion mechanism; 41, rotating arm support; 42, rotating arm; 5, pressing and cutting mechanism; 51, pressure roller; 52, rotary cutter; 6, second motion mechanism; 61, swing arm support; 62, swing arm; 71, first sensor. Specific embodiments

[0042] The following further elaborates on the present utility model in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the exemplified embodiments do not limit the present utility model.

[0043] See Figures 1 to 3 As shown, an embodiment of the automatic roll changing device provided by the present utility model.

[0044] The above-mentioned automatic roll changing device includes:

[0045] At least two unwinding mechanisms 3, and the above-mentioned unwinding mechanism 3 is used to support the reel 11 and drive the reel 11 to rotate around the first axis;

[0046] The first motion mechanism 4 is used to install the above-mentioned at least two unwinding mechanisms 3 and drive the unwinding mechanism 3 carrying the new material roll to revolve around the second axis to the unwinding station 21 and drive the unwinding mechanism 3 carrying the old material roll to revolve around the second axis to the loading station 22. The starting part of the new material roll at the unwinding station 21 can rotate with the above-mentioned reel to the tape connection position, and the joint part of the old material roll at the loading station 22 can pass through the above-mentioned tape connection position during the unwinding process;

[0047] The pressing and cutting mechanism 5 is used to press the starting part of the new material roll at the unwinding station 21 and the joint part of the old material roll at the loading station 22 together and cut off the tail material of the old material roll at the loading station 22;

[0048] The second motion mechanism 6 is used to drive the pressing and cutting mechanism 5 to reach and leave the pressing and cutting position.

[0049] The detection system includes a first sensor 71, and the first sensor 71 is used to measure the distance between the outer peripheral surface of the reel 11 and the outer peripheral surface of the supply reel 12 on the reel 11.

[0050] The control system receives the detection data of the detection system and controls the unwinding mechanism 3, the first motion mechanism 4, the pressing and cutting mechanism 5, and the second motion mechanism 6.

[0051] Wherein, both the first axis and the second axis are parallel to the first direction.

[0052] The automatic reel changing device is used to drive a new reel to reach the unwinding station 21, drive the old reel to move to the loading station 22, and connect the new reel and the old reel together. Each reel has a head end at the outermost end and a tail end at the innermost end. The starting part of the new reel is the head end of the new reel. The joint part of the old reel is close to the tail end of the old reel. The joint part of the old reel is generally separated from the tail end of the old reel by a certain distance, and the part between the joint part of the old reel and the tail end of the old reel is the tail material to be cut off (including the tail end, but not including the joint part). On the premise of not affecting the reel change, the shorter the length of the tail material, the better.

[0053] The unwinding mechanisms 3 are used in pairs. Among the two unwinding mechanisms 3 used in pairs, when one unwinding mechanism 3 is located at the unwinding station 21, the other unwinding mechanism 3 is located at the loading station 22, and the reels on the paired two unwinding mechanisms 3 are connected together. The first motion mechanism 4 drives the paired two unwinding mechanisms 3 to exchange positions, and it is necessary to ensure that the ongoing unwinding mechanism 3 is not affected during the position exchange.

[0054] The pressing and cutting mechanism 5 is arranged near the unwinding station 21, and the pressing and cutting position is close to the tape connecting position. The pressing and cutting mechanism 5 should not affect the ongoing unwinding action of the new and old reels when performing the pressing and cutting action. The second motion mechanism 6 drives the pressing and cutting mechanism 5 close to the unwinding station 21, so that the distance between the pressing and cutting mechanism 5 and the reel at the unwinding station 21 is not too large, so as to facilitate the subsequent pressing and cutting mechanism 5 to quickly press and cut the new and old reels and cut the old reel. By pressing and cutting the new and old reels by the pressing and cutting mechanism 5 and cutting the old reel, the problem that manual reel cutting requires frequent entry into the safety fence to touch the reel is solved, and cost reduction and efficiency improvement are realized.

[0055] The first sensor 71 is a distance sensor, which is used to measure the distance difference between the outer peripheral surface of the reel 11 and the outer peripheral surface of the material roll 12 on the reel 11, so as to obtain the real-time remaining amount of the material roll. By detecting the distance between the outer peripheral surfaces of the reel 11 and the material roll 12 on the reel through the first sensor 71, the roll change timing is judged. This detection method does not detect the diameter of the material roll 12, but only detects the height difference between the outer ring of the material roll 12 and the reel 11. Therefore, it is not affected by the circular runout of the reel 11 and manual gluing, and can accurately detect the thickness of the material roll, providing a reliable judgment basis for the material roll switching station and roll cutting, and ensuring that the tail material of the old material roll after roll cutting is controlled within a lower range.

[0056] The control system is used to calculate the real-time tail material length L of the material roll on the unwinding mechanism 3. The calculation method of the tail material length L is as follows: The material roll is wound around the reel by n layers of materials, the thickness of a single layer of material is h, the number of material layers n = the thickness of the material roll H / the thickness of a single layer of material h, the diameter of the reel is D, and the tail material length L = π * D * n

[0057] Example: Suppose the diameter D of the reel used on site is 185 mm, the thickness h of a single layer of the material used is 4.5 μm, that is, 0.0045 mm, and the first sensor 71 detects that the thickness H of the material roll is 0.77 mm. Then:

[0058] The number of material layers n = H / h = 0.77 / 0.0045 = 171.1;

[0059] The tail material length L = π * D * n = 3.14 * 185 * 171.1 = 99392.0 mm = 99.4 m.

[0060] Specifically in this embodiment, the above-mentioned material is a foil material, the above-mentioned control system is a coating machine PLC control system, and the first direction is the horizontal direction.

[0061] The following introduces the roll change method of the above automatic roll change device, including the following steps:

[0062] S1. Unwind. The unwinding mechanism 3 at the unwinding station 21 unwinds. The first sensor 71 scans the outer peripheral surfaces of the reel 11 and the material roll 12 on the reel at the unwinding station 21 in real time, and obtains the height difference between the reel 11 and the material roll 12, that is, the thickness of the material roll. The material roll thickness data will be synchronously uploaded to the control system, and the real-time roll material length of the material roll at the unwinding station 21 is obtained through conversion. When the roll material length of the material roll at the unwinding station 21 is consumed to the alarm value L0, the system alarms to prompt that a roll change is required, and enters step S2;

[0063] S2. Switch the working station. The first motion mechanism 4 drives the old material roll on the unwinding station 21 to move to the loading station 22, and at the same time drives the new material roll on the loading station 22 to move to the unwinding station 21. During this process, the old material roll moving from the unwinding station 21 to the loading station 22 is still unwinding continuously, and the first sensor 71 is still detecting the remaining amount of the old material roll. And the unwinding mechanism 3 at the unwinding station 21 drives the new material roll to pre-rotate to ensure that the new material roll and the old material roll have the same rotation direction and linear velocity, avoiding tape splicing failure, and enter step S3;

[0064] S3. Cut the roll. The second motion mechanism 6 drives the pressing and cutting mechanism 5 to move to the pressing and cutting position, then presses the joint part of the old material roll and the starting part of the new material roll together, and then cuts off the tail material of the old material roll, and returns to step S1.

[0065] In this embodiment, the first sensor 71 is a multi-point laser sensor, the lens of the multi-point laser sensor faces the second direction, and the second direction forms an angle with the first direction.

[0066] The multi-point laser sensor is an advanced sensing technology. It emits a laser beam and uses a photodetector to receive the optical signal reflected back by the target object, and then calculates the distance and shape of the target object according to the time delay of the laser beam and the intensity of the optical signal. Compared with the traditional single-point laser sensor, the multi-point laser sensor can obtain data of multiple points at the same time, so as to realize the all-round measurement of the target object. The first direction and the second direction form an angle with each other to ensure that the first sensor 71 can scan the reel and the material roll on the reel at the same time. The multi-point laser sensor uploads the 3D image scan to the control system in real time. Because the first sensor 71 is installed obliquely, the control system needs to correct the inclination of the image through the built-in program to calculate the accurate material roll thickness data, and upload the data of the material roll thickness H to the control system. The control system calculates the real-time tail material length L on the unwinding mechanism. The laser sensor does not need to be cleared, continuously and accurately detects and uploads data to the control system in real time. By setting the first sensor 71 as a multi-point laser sensor, one multi-point laser sensor can complete the detection achieved by multiple sensors in the past, and the detection accuracy is relatively high. Specifically in this embodiment, the angle between the second direction and the first direction is 20 - 40°, such as 20°, 25°, 30°, 35° or 40°.

[0067] In this embodiment, the unwind mechanism 3 includes a reel support 31, a reel support member 32, and a reel driving device. The reel support 31 is mounted on the first motion mechanism 4. The reel support member 32 is rotatably connected to the reel support 31 about a first direction, and at least a part of the reel support member 32 is radially telescopic. The reel support member 32 is used to support and position the reel 11. The reel driving device drives the reel support member 32 to rotate about the first axis of the reel it supports.

[0068] The radial dimension of the radially telescopic part of the reel support member 32 is its diameter. When the reel support member 32 extends into the inner hole of the reel 11, the diameter of the radially telescopic part of the reel support member 32 becomes smaller, so as to facilitate the reel support member 32 to extend into the inner hole of the reel 11. After the reel support member 32 extends into the inner hole of the reel 11, the diameter of the radially telescopic part of the reel support member 32 becomes larger, and the inner hole of the reel 11 is tightened, so as to facilitate the mutual positioning of the reel support member 32 and the reel 11. Through the telescoping of the reel support member 32, it is convenient to replace the reel on the unwind mechanism 3. By providing the reel driving device, the unwind mechanism 3 can actively unwind, so as to drive the new and old material reels to maintain the same rotation speed and rotation direction during the joining process. Specifically in this embodiment, the reel support member 32 is an expansion shaft, and the rotation driving device is a servo motor.

[0069] In this embodiment, the first sensor 71 is mounted on the reel support 31.

[0070] The first sensor 71 should maintain an appropriate distance from the reel 11 and the material reel 12 on the unwind mechanism. If the distance is too large, it is difficult for the first sensor 71 to detect the reel 11 and the material reel 12. If the distance is too small, the rotation of the reel 11 and the material reel 12 will be affected. Specifically in this embodiment, the first sensor 71 is mounted on a sensor support, and the sensor support is mounted on the reel support 31. On the one hand, the distance between the first sensor 71 and the reel 11 and the material reel 12 is not too large, and it is easier to detect the reel 11 and the material reel 12. On the other hand, the distance between the first sensor 71 and the reel 11 and the material reel 12 is not too small, and the rotation of the reel 11 and the material reel 12 will not be interfered.

[0071] In this embodiment, the first motion mechanism 4 includes a boom support 41, a boom 42, and a rotation driving device. The middle section of the boom 42 is rotatably connected to the boom support 41 about the second axis. The rotation driving device drives the boom 42 to rotate about the second axis. Two unwind mechanisms 3 are respectively mounted at both ends of the boom 42.

[0072] In order to ensure that the two unwinding mechanisms 3 are in the same position when located at the unwinding station 21, facilitating the pressing together of the new and old material rolls and the cutting of the old material roll, the distances between the two unwinding mechanisms 3 and the axis of rotation of the rotating arm 42 are set to be the same. The same rotating arm 42 drives at least two unwinding mechanisms 3 to revolve synchronously, enabling the new and old material rolls to be interchanged between the unwinding station 21 and the loading station 22 synchronously. Specifically in this embodiment, the rotary drive device is a servo motor. The rotary drive device drives the rotating arm 42 to rotate through a worm and worm gear reducer. An absolute value type high-resolution angle detection mechanism, a proximity switch, and a mechanical limit mechanism are installed on the axis of rotation of the rotating arm 42 to ensure that the turret can be accurately positioned.

[0073] In this embodiment, the above-mentioned pressing and cutting mechanism 5 includes a pressure roller 51 and a rotary cutter 52. The above-mentioned pressure roller is used to press the starting part of the new material roll at the unwinding station 21 and the joint part of the old material roll at the loading station 22 together. The above-mentioned rotary cutter 52 is used to cut off the tail of the joint part of the old material roll at the loading station 22.

[0074] The above-mentioned pressure roller 51 is rotatably connected to the second motion mechanism in a first direction. When the pressure roller 51 presses the starting part of the new material roll and the joint part of the old material roll, the pressure roller 51 rolls and contacts the advancing new and old material rolls, without affecting the unwinding action of the new and old material rolls. The rotary cutter 52 can easily cut the foil material that is difficult to cut by a traditional cutting tool by rotating the circular blade.

[0075] In this embodiment, the above-mentioned second motion mechanism 6 includes a swing arm support 61, a swing arm 62, and a swing drive device. One end of the above-mentioned swing arm 62 is rotatably connected to the above-mentioned swing arm support 61 about a third axis. The above-mentioned pressing and cutting mechanism 5 is installed at the other end of the above-mentioned swing arm 62. The above-mentioned swing drive device drives the above-mentioned swing arm 62 to swing about the above-mentioned third axis, and the above-mentioned third axis is parallel to the above-mentioned first direction.

[0076] When the number of old material rolls at the unwinding station 21 is consumed to the set tail material warning value L1, the swing arm 62 is driven by the swing arm drive device to start lifting until it reaches the pressing and cutting position, and the swing arm 62 stops lifting and waits for the roll to be cut. The pressing and cutting mechanism 5 is driven by the swing drive device to swing close to and away from the material roll, realizing the pressing together of the new and old material rolls and the cutting of the old material roll. Specifically in this embodiment, the above-mentioned swing arm drive device includes a servo motor, and the servo motor is connected to the swing arm 62 through a worm and worm gear reducer.

[0077] In this embodiment, the above-mentioned detection system further includes a second sensor, and the above-mentioned second sensor is used to measure whether the starting part of the new material roll reaches the above-mentioned tape joining position. The above-mentioned second sensor is installed on the above-mentioned swing arm support 61.

[0078] The length of the foil consumed when the material roll 12 rotates one circle is approximately equal to the circumference of the reel 11. Denote the length of the foil consumed when the reel 11 rotates one circle as L2, and L2 = π * D. The length of the foil consumed during the process when the swing arm 62 rises to the in-place position and first detects the starting part of the new material roll is L3. Since the starting part of the new material roll will surely reach the tape connection position when the material roll completes one rotation, so L3 ≤ L2, and L_target = L1 - L2 - L3. The time interval between the two arrivals of the starting part of the new material roll at the tape connection position is the time T0 required for the material roll to rotate one circle. T0 is calculated by the control system according to the linear velocity V of the material roll rotation, T0 = L2 / V. The time T1 for the pressure roller to lift, the time T2 for the pressure roller to press tightly, and the time T3 for the cutter to act are fixed action times. T11 is the triggering time of the pressure roller 51, and T12 is the triggering time of the rotary cutter 52, that is, T0 = T11 + T1 + T2 = T12 + T3. Since the circumference of the reel is fixed, the length of the foil consumed when the material roll rotates one circle, L2, is also fixed. By using the present invention, only by setting a suitable warning value L1 for the tail material, the automatic control of the bottom tail material of each roll of foil can be effectively realized.

[0079] When the second sensor first detects the starting part of the new material roll, it indicates that the starting part of the new material roll first passes through the tape connection position, and the control system starts to calculate the triggering times of the pressure roller and the cutter. When the time reaches the triggering time T11 of the pressure roller, the pressure roller 51 starts to lift. When the pressure roller 51 reaches the tape connection position, the starting part on the new material roll passes through the tape connection position for the second time, and the joint part of the old material roll just passes through the tape connection position. The pressure roller 51 presses the joint part of the old material roll onto the starting part of the new material roll, and just adheres to the starting part of the new material roll on the new material roll, completing the automatic tape connection action. At the same time, the rotary cutter 52 extends after reaching the set triggering time T12, cutting off the old material roll, completing the automatic roll cutting action. By setting the second sensor, it is ensured that the pressing and cutting mechanism can just press the old material roll onto the starting part of the new material roll, ensuring the bonding quality.

[0080] In this embodiment, the above-mentioned second sensor is a color mark sensor, and the color mark sensor is used to detect whether the tape on the starting part of the new material roll at the unwinding station 21 reaches the above-mentioned tape connection position.

[0081] The starting part of the new material roll is adhered with a tape for fitting with the joint part of the old material roll. There is a color difference between this tape and the material roll. By detecting the tape of the new material roll with the color mark sensor, it can accurately detect whether the starting part of the new material roll reaches the tape connection position.

[0082] In this embodiment, the above-mentioned detection system further includes a third sensor. The third sensor is used to measure whether the pressing and cutting mechanism 5 reaches the above-mentioned tape connection position. The third sensor is an opposed grating, and the third sensor is installed on the swing arm 62.

[0083] When there is a certain difference between the original coil diameter of the new material coil at the unwinding station 21 and the set value, if the first moving mechanism 4 and / or the second moving mechanism 6 only move to the set position according to the set program, the situation that the pressing and cutting mechanism 5 does not contact or over-contacts the coil may occur. By setting the third sensor, the relative position between the pressing and cutting mechanism 5 and the coil can be detected, so as to ensure that the pressing and cutting mechanism 5 can successfully press the new and old material coils and cut off the tail material of the old material coil. Specifically, the above-mentioned third sensor is an opposed grating, which consists of a transmitter and a receiver. The transmitter emits parallel light beams, and the receiver receives these light beams. When the relative position between the pressing and cutting mechanism 5 and the coil is the set position relationship, at this time when the light beam is blocked by the coil, the system will immediately send a signal and the second moving mechanism 6 will stop running. By setting the third sensor, it can be detected whether the pressing and cutting mechanism 5 reaches the tape connecting position, so as to control the second moving mechanism 6 according to the detection data of the third sensor, and ensure that the new and old material coils can be successfully pressed and the tail material of the old material coil can be cut off.

[0084] During actual operation, after the unwinding mechanism just moves from the unwinding station 21 to the loading station 22, a new material coil is replaced to prepare for the next coil change. It can also be that a new material coil is replaced after receiving a signal, or at other times as long as there is a new material coil on the unwinding mechanism at the loading station 22 during coil change. When replacing the new material coil, first install the new material coil on the unwinding mechanism at the loading station. Then, the operator horizontally pastes the double-sided tape on the new material coil according to the position indicated by the calibrator, starts the button to drive the first moving mechanism to rotate. When it is flipped to the unwinding station, the positioning safety cylinder automatically rises and the fixation of the new material coil is completed.

[0085] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. An automatic roll changing device, characterized in that, Comprising: At least two unwinding mechanisms (3), the unwinding mechanism (3) being used to support the reel (11) and drive the reel (11) to rotate about a first axis; A first motion mechanism (4), used to mount the at least two unwinding mechanisms (3) and drive the unwinding mechanism (3) carrying the new material roll to revolve about a second axis to an unwinding station (21) and drive the unwinding mechanism (3) carrying the old material roll to revolve about the second axis to a loading station (22), the starting part of the new material roll at the unwinding station (21) can rotate with the reel to a tape connecting position, and the joint part of the old material roll at the loading station (22) can pass through the tape connecting position during the unwinding process; A pressing and cutting mechanism (5), the pressing and cutting mechanism (5) being used to press the starting part of the new material roll at the unwinding station (21) and the joint part of the old material roll at the loading station (22) together and cut off the tail material of the old material roll at the loading station (22); A second motion mechanism (6), the second motion mechanism (6) being used to drive the pressing and cutting mechanism (5) to reach and leave the pressing and cutting position; A detection system, the detection system including a first sensor (71), the first sensor (71) being used to measure the distance between the outer peripheral surface of the reel (11) and the outer peripheral surface of the material roll (12) on the reel (11); A control system, the control system receiving the detection data of the detection system and controlling the unwinding mechanism (3), the first motion mechanism (4), the pressing and cutting mechanism (5), and the second motion mechanism (6); Wherein, the first axis and the second axis are both parallel to a first direction.

2. The automatic roll changing device according to claim 1, characterized in that, The first sensor (71) is a multi-point laser sensor, the lens of the multi-point laser sensor faces a second direction, and the second direction forms an angle with the first direction.

3. The automatic roll changing device according to claim 1, characterized in that, The unwinding mechanism (3) includes a reel bracket (31), a reel support (32), and a reel driving device, the reel bracket (31) is mounted on the first motion mechanism (4), the reel support (32) is rotatably connected to the reel bracket (31) about a first direction, and at least part of the reel support (32) is radially telescopic, the reel support (32) is used to support and position the reel (11), and the reel driving device drives the reel support (32) to rotate about the first axis of the reel it supports.

4. The automatic roll changing device according to claim 3, characterized in that, The first sensor (71) is mounted on the reel bracket (31).

5. The automatic roll changing device according to claim 1, characterized in that, The first motion mechanism (4) includes a boom bracket (41), a boom (42), and a rotation driving device, the middle position of the boom (42) is rotatably connected to the boom bracket (41) about the second axis, the rotation driving device drives the boom (42) to rotate about the second axis, and two of the unwinding mechanisms (3) are respectively mounted at both ends of the boom (42).

6. The automatic roll changing device according to claim 1, characterized in that, The pressing and cutting mechanism (5) includes a pressing roller (51) and a rotary cutter (52). The pressing roller is used to press the starting part of the new material roll at the unwinding station (21) and the joint part of the old material roll at the loading station (22) together. The rotary cutter (52) is used to cut off the tail material of the old material roll at the loading station (22).

7. The automatic roll changing device according to claim 1, wherein, The second motion mechanism (6) includes a swing arm bracket (61), a swing arm (62) and a swing driving device. One end of the swing arm (62) is rotatably connected to the swing arm bracket (61) around a third axis. The pressing and cutting mechanism (5) is installed at the other end of the swing arm (62). The swing driving device drives the swing arm (62) to swing around the third axis, and the third axis is parallel to the first direction.

8. The automatic roll changing device according to claim 7, characterized in that, The detection system further includes a second sensor, which is used to measure whether the starting part of the new material roll reaches the tape connecting position. The second sensor is installed on the swing arm bracket (61).

9. The automatic roll changing device according to claim 8, characterized in that, The second sensor is a color mark sensor, which is used to detect whether the tape on the starting part of the new material roll at the unwinding station (21) reaches the tape connecting position.

10. The automatic roll changing device according to any one of claims 7 to 9, characterized in that, The detection system further includes a third sensor, which is used to measure whether the pressing and cutting mechanism (5) reaches the above-mentioned pressing and cutting position. The third sensor is an opposed grating, and the third sensor is installed on the swing arm (62).

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