Automatic unwinding device for a film

Abstract

The application discloses an automatic unwinding equipment for a film, which comprises a deviation rectifying device, an active unwinding machine and an automatic cutting device installed on the deviation rectifying device, the active unwinding machine comprises a roll changing station and an unwinding station, a pair of air expansion shafts which are alternately rotated to the unwinding station and a servo power mechanism which drives each air expansion shaft to rotate around its own axis, the automatic cutting device comprises a rack, a cutting swing arm mechanism installed on the rack and a kiss roll mechanism located at the rear side of the cutting swing arm mechanism, the cutting swing arm mechanism comprises a swing arm, a cutting assembly and a compression roller assembly installed on the swing arm and a pair of photoelectric sensors installed at the compression roller assembly, the kiss roll mechanism comprises a swing roll which swings up and down, a low-friction air cylinder, a swing gear which swings coaxially with the swing roll and an angular displacement assembly which is matched with the swing gear, and the angular displacement assembly is signal-connected with the servo power mechanism, and the application realizes automatic cutting and automatic winding of the product through the cutting swing arm mechanism and realizes constant tension winding and non-stop roll changing through the kiss roll mechanism.

Description

Technical Field

[0001] This application relates to the field of automatic unwinding equipment, and in particular to an automatic unwinding device for film. Background Technology

[0002] Currently, traditional unwinding equipment for producing TPU automotive film and substrate requires manual splicing after each roll is unwound, extending roll changeover time, and is inconvenient to operate, reducing production efficiency. Furthermore, during the unwinding process, it is necessary to maintain constant tension on the automotive film to prevent wrinkles or tears. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the purpose of this application is to provide an automatic unwinding device for thin films.

[0004] To achieve the above objectives, this application adopts the following technical solution: an automatic unwinding device for film, comprising... A correction device includes a base frame and a correction cylinder. The base frame is configured to be movable in a left-right direction and mounted on the ground. The correction cylinder is driven between the base frame and the ground to drive the base frame to move back and forth in a left-right direction relative to the ground. An active unwinding machine, mounted on the base frame, includes a front-to-back roll changing station and an unwinding station, a pair of air shafts that alternately rotate around a first center line to the unwinding station, a flipping drive mechanism that drives the pair of air shafts to rotate around the first center line, and a servo power mechanism that drives the pair of air shafts to rotate around their own axes. The first center line extends in a left-right direction, and the pair of air shafts are symmetrically arranged on both sides of the first center line and parallel to it. A new roll of material with adhesive tape bonded to its first end is wound on the air shafts at the unwinding station. The flipping drive mechanism and the servo power mechanism are arranged on different sides of the pair of air shafts. An automatic cutting device is mounted on the base frame and located behind the active unwinding machine. The automatic cutting device includes a frame, a cutting swing arm mechanism mounted on the frame, and a roller-shaping mechanism located behind the cutting swing arm mechanism. The cutting swing arm mechanism includes a swing arm having a first end and a second end, a cutting assembly mounted on the second end, a pressure roller assembly mounted on the swing arm, and a through-beam sensor mounted on the pressure roller assembly. The first end of the swing arm is rotatably mounted on the frame. The cutting assembly is used to cut the product in a left-right direction. The pressure roller assembly is configured to press the product between the changing station and the unwinding station onto the new roll of tape at the unwinding station. The through-beam sensor is used to detect the position of the new roll of tape and is signal-connected to the pressure roller assembly, the cutting assembly, and the servo power mechanism. The roller-shaping mechanism includes a swing roller capable of swinging up and down, a low-friction cylinder drively connected to the swing roller, a swing gear oscillating coaxially with the swing roller, and an angular displacement assembly cooperating with the swing gear. The angular displacement assembly is signal-connected to the servo power mechanism.

[0005] In the above technical solution, a further preferred embodiment is that a plurality of slide rail assemblies are installed between the base frame and the ground. Each slide rail assembly includes a guide rail installed on the ground and a slider installed at the bottom of the base frame. The guide rail extends in the left-right direction, and the slider cooperates with the corresponding guide rail.

[0006] In the above technical solution, a further preferred embodiment is that the correction device further includes a correction probe installed on the rear side of the active unwinding machine, and the correction probe is signal-connected to the correction electric cylinder.

[0007] In the above technical solution, a further preferred embodiment is that the active unwinding machine further includes a support frame mounted on the base frame and a flipping mechanism that flips around the first center line on the support frame. The flipping mechanism includes a central shaft assembly extending in the left-right direction and a flipping frame coaxially sleeved on the central shaft assembly. The pair of air shafts are detachably mounted on the flipping frame. The flipping drive mechanism is drivenly connected to one end of the central shaft assembly to drive the flipping frame to rotate around the first center line. The servo power mechanism is drivenly connected to the other end of the central shaft assembly.

[0008] In the above technical solution, a further preferred embodiment is that the flipping drive mechanism includes a flipping motor and a worm gear assembly that is driven between the central shaft assembly and the flipping motor. The worm gear assembly includes a worm that is driven by the flipping motor and a worm gear that is coaxially arranged with the central shaft assembly. The worm gear meshes with the worm.

[0009] In the above technical solution, it is further preferred that the tilting frame is equipped with two pairs of clamping cylinders, each pair of clamping cylinders is arranged opposite to each other and is configured to clamp the air expansion shaft on the tilting frame.

[0010] In the above technical solution, a further preferred embodiment is that the cutting assembly includes a rodless cylinder mounted on the second end and a cutter mounted on the rodless cylinder, wherein the rodless cylinder is used to drive the cutter to move back and forth in the left-right direction to cut the product.

[0011] In the above technical solution, a further preferred embodiment is that the pressure roller assembly includes a pressure roller and a pressure roller cylinder that is connected to the pressure roller in a transmission manner. The pressure roller cylinder is mounted on the swing arm, and the pressure roller is mounted on the swing arm in a manner that allows it to swing and rotate around its own axis. The pressure roller cylinder is used to drive the pressure roller to press the product between the changing station and the unwinding station onto the new roll at the unwinding station.

[0012] In the above technical solution, a further preferred embodiment is that the angular displacement component includes an angular displacement gear rotatably mounted on the frame and an angular displacement sensor mounted on the angular displacement gear, wherein the angular displacement sensor is signal-connected to the servo power mechanism.

[0013] In the above technical solution, a further preferred embodiment is that the frame is also equipped with a pair of limiting blocks arranged opposite each other, the pair of limiting blocks being respectively arranged above the swing arm and below the swing arm.

[0014] Compared with the prior art, this application achieves the following beneficial effects: This application enables dual-station unwinding of products, continuous unwinding, high unwinding efficiency, and good unwinding quality; the cutting swing arm mechanism automatically cuts and automatically winds the products, and the roller mechanism can precisely control the tension of the unwinding of the products, achieving constant tension winding and non-stop roll changing. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of an automatic unwinding device for film provided in an embodiment of this application; Figure 2 for Figure 1 A three-dimensional structural diagram of the automatic unwinding device from another perspective; Figure 3 for Figure 1 Side view of the automatic unwinding device in the middle; Figure 4 for Figure 3A schematic diagram of the automatic unwinding device in the unwinding state; Figure 5 for Figure 3 A schematic diagram of the automatic unwinding device in the roll changing state; Figure 6 for Figure 1 A three-dimensional structural diagram of the correction device in the diagram; Figure 7 for Figure 6 Front view of the correction device in the middle; Figure 8 for Figure 1 A top view of the active unwinding machine in the middle; Figure 9 for Figure 1 A three-dimensional structural diagram of the automatic cutting device in the diagram; Figure 10 for Figure 9 Front view of the automatic cutting device in the middle; Figure 11 For along Figure 10 A sectional view cut along line AA in the diagram; Figure 12 for Figure 10 A schematic diagram of the cutting swing arm mechanism.

[0016] The components include: 100. Automatic unwinding equipment; 10. Deviation correction device; 1. Base frame; 2. Deviation correction electric cylinder; 3. Slide rail assembly; 31. Guide rail; 32. Slider; 20. Active unwinding machine; 5. Support frame; 51. Roll changing station; 52. Unwinding station; 6. Tilting mechanism; 61. Central shaft assembly; 62. Tilting frame; 63. Tightening cylinder; 7. Tilting drive mechanism; 71. Tilting motor; 72. Worm gear assembly; 721. Worm; 722. Worm gear; 8. Air shaft; 9. Servo power mechanism; 91. Servo motor; 30. Automatic cutting assembly. 11. Frame; 12. Cutting swing arm mechanism; 121. Cutting assembly; 1211. Rodless cylinder; 1212. Cutter; 122. Swing arm; 1221. First end; 1222. Second end; 123. Swing arm cylinder; 124. Pressure roller assembly; 1241. Pressure roller; 1242. Pressure roller cylinder; 125. Through-beam sensor; 13. Swing roller mechanism; 131. Swing arm; 132. Swing roller; 133. Low friction cylinder; 134. Swing gear; 135. Angular displacement gear; 136. Limit block; 137. Transition aluminum roller. Detailed Implementation

[0017] To illustrate the technical content, structural features, achieved objectives, and effects of the application in detail, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, structure, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0018] This application provides an automatic unwinding device for films, which can unwind products at two stations, with high unwinding efficiency and good unwinding quality.

[0019] like Figure 1-3 As shown, the automatic unwinding equipment 100 includes a correction device 10, an active unwinder 20 and an automatic cutting device 30 mounted on the correction device 10. The active unwinder 20 is arranged in front of the automatic cutting device 30 and is used for dual-station unwinding. The automatic cutting device 30 is used to cut the product when the active unwinder 20 changes rolls and can detect the tension of the product in real time, so that the active unwinder 20 can maintain constant tension unwinding.

[0020] like Figure 1 , 6 As shown in Figure 7, the correction device 10 includes a base frame 1 and a correction cylinder 2. The base frame 1 is configured to be mounted on the ground and can move back and forth in the left and right direction. The correction cylinder 2 is driven between the base frame 1 and the ground to drive the base frame 1 to move back and forth in the left and right direction relative to the ground.

[0021] Multiple slide rail assemblies 3 are installed between the base frame 1 and the ground. Each slide rail assembly 3 includes a guide rail 31 installed on the ground and a slider 32 installed at the bottom of the base frame 1. The guide rail 31 extends in the left-right direction, and the slider 32 cooperates with the corresponding guide rail 31. The base frame 1 can move smoothly in the left-right direction through the multiple slide rail assemblies 3 to correct the unwinding of the active unwinding machine 20.

[0022] The web correction device 10 also includes a web correction probe (not shown in the figure) installed on the rear side of the active unwinder 20. The web correction probe is signal-connected to the web correction cylinder 2. When the active unwinder 20 unwinds the sheet material out of alignment, the web correction probe detects this and transmits a signal to the web correction cylinder 2. The web correction cylinder 2 then drives the base frame 1 to move to correct the unwinding position of the sheet material. The web correction cylinder 2 has high web correction accuracy and fast response speed, and when used in conjunction with the web correction probe, it can improve the web correction speed.

[0023] like Figure 1 , 2 As shown in Figures 3 and 8, the active unwinding machine 20 includes a support frame 5 mounted on the base frame 1, a flipping mechanism 6 that flips on the support frame 5 around a first center line X1 extending in the left-right direction, a flipping drive mechanism 7 that is driven by the flipping mechanism 6, a pair of air shafts 8 that are rotatably mounted on the flipping mechanism 6, and a servo power mechanism 9 that is driven by the pair of air shafts 8.

[0024] The support frame 5 has a front-to-back rewinding station 51 and an unwinding station 52. The flipping drive mechanism 7 drives the flipping mechanism 6 to flip around the first center line X1, so that a pair of air shafts 8 alternately rotate to the unwinding station 52. The air shafts 8 of the unwinding station 52 are used to unwind the products downstream, and the air shafts 8 of the rewinding station 51 perform the rewinding operation.

[0025] The flipping mechanism 6 includes a central shaft assembly 61 extending in the left-right direction and a flipping frame 62 coaxially sleeved on the central shaft assembly 61. The central shaft assembly 61 is connected to the flipping drive mechanism 7 and the servo power mechanism 9 respectively. The flipping drive mechanism 7 drives the central shaft assembly 61 to drive the flipping frame 62 to flip around the first center line X1. The servo power mechanism 9 is connected to a pair of air shafts 8 through the central shaft assembly 61 to drive each air shaft 8 to rotate relative to the flipping frame 62 around its own axis.

[0026] A pair of air shafts 8 are symmetrically arranged on both sides of the first center line X1 and parallel to the first center line X1. Each air shaft 8 is detachably mounted on the tilting frame 62. Two pairs of clamping cylinders 63 are installed on the tilting frame 62. Each pair of clamping cylinders 63 is arranged opposite to the left and right. One pair of clamping cylinders 63 clamps the air shaft 8 inward to clamp the air shaft 8 on the tilting frame 62, so that the air shaft 8 can rotate relative to the tilting frame 62 around its own axis, and can also tilt with the tilting frame 62 around the first center line X1.

[0027] The flipping drive mechanism 7 includes a flipping motor 71 and a worm gear assembly 72 that is driven between the central shaft assembly 61 and the flipping motor 71. The worm gear assembly 72 includes a worm 721 that is driven by the flipping motor 71 and a worm wheel 722 that is coaxially arranged with the central shaft assembly 61. The worm 721 and the worm wheel 722 mesh with each other. The worm gear assembly 72, combined with the clamping cylinder 63, effectively shortens the roll changing time and supports uninterrupted continuous production.

[0028] like Figure 2 , 8As shown, the servo power mechanism 9 includes a pair of servo motors 91 that are respectively driven by a pair of air shafts 8. The pair of servo motors 91 are driven by the pair of air shafts 8 through a central shaft assembly 61. Each servo motor 91 is used to drive the corresponding air shaft 8 to rotate around its own axis relative to the flipping mechanism 6. Each servo motor 91 responds quickly and can flexibly control the unwinding speed of the corresponding air shaft 8.

[0029] like Figure 9-12 As shown, the automatic cutting device 30 includes a frame 11, a cutting swing arm mechanism 12 and a roller-binding mechanism 13 mounted on the frame 11. The cutting swing arm mechanism 12 is located in front of the roller-binding mechanism 13 and close to the unwinding station 52 of the active unwinding machine 20. It is used to cut the products on the air shaft 8 of the unwinding station 51 when the active unwinding machine 20 changes rolls, and automatically bond the cut start to the large roll replenished at the unwinding station 52 to ensure continuous unwinding of the active unwinding machine 20. The roller-binding mechanism 13 is located behind the cutting swing arm mechanism 12. It is used to temporarily store products when the active unwinding machine 20 changes rolls, and release the temporarily stored products when the cutting swing arm mechanism 12 cuts the products to ensure that the subsequent production line can operate continuously without stopping. It can also transmit the tension changes of the products to the servo power mechanism 9 in a timely manner. The servo motor 91 corresponding to the air shaft 8 in the unwinding station 52 can adjust the unwinding speed in a timely manner to ensure constant tension unwinding of the products.

[0030] The cutting arm mechanism 12 includes a swing arm 122 on which a cutting assembly 121 is mounted and a swing arm cylinder 123 that is pulsatorically connected to the swing arm 122. The swing arm 122 is rotatably mounted on the frame 11 about a second center line X2 extending in the left-right direction, and the swing arm cylinder 123 is used to drive the swing arm 122 to swing back and forth about the second center line X2.

[0031] The swing arm 122 has a first end 1221 and a second end 1222 that are far apart from each other. The first end 1221 is rotatably connected to the frame 11 and connected to the swing arm cylinder 123. The swing arm cylinder 123 drives the swing arm 122 to swing back and forth around the second center line X2 when extending and retracting the air rod. The cutting assembly 121 includes a rodless cylinder 1211 mounted on the second end 1222 and a cutter 1212 mounted on the rodless cylinder 1211. The rodless cylinder 1211 is used to drive the cutter 1212 to move back and forth in the left-right direction to cut the product.

[0032] A pressure roller assembly 124 is mounted on the swing arm 122, located between the first end 1221 and the second end 1222. The pressure roller assembly 124 includes a pressure roller 1241 and a pressure roller cylinder 1242 that is drively connected to the pressure roller 1241. The pressure roller cylinder 1242 is mounted on the swing arm 122, and the pressure roller 1241 is mounted on the swing arm 122 in a way that allows it to swing and rotate around its own axis. The pressure roller cylinder 1242 is used to drive the pressure roller 1241 to swing back and forth relative to the swing arm 122 around a third center line X3, thereby pressing the product between the changing station 51 and the unwinding station 52 onto the large roll at the unwinding station 52 for changing operations.

[0033] A through-beam sensor 125 is also installed on the swing arm 122. The through-beam sensor 125 is arranged close to the pressure roller 1241 and is used to sense the tape on the large roll at the unwinding station 52. The through-beam sensor 125 is linked and controlled with the servo power mechanism 9, the pressure roller cylinder 1242, and the rodless cylinder 1211.

[0034] like Figure 4 , 5 As shown, the swing arm 122, driven by the swing arm cylinder 123, has a second end 1222 with a cutting position close to the unwinding station 52 and an initial position away from the unwinding station 52.

[0035] When the active unwinding machine 20 is changing rolls, the old roll that is about to be unwound in the unwinding station 52 is flipped to the changing station 51, and the new roll with adhesive tape attached to the first end that is added in the changing station 51 is flipped to the unwinding station 52. At this time, the product released from the old roll passes under the unwinding station 52. The swing arm cylinder 123 drives the swing arm 122 to swing to the cutting position. The through-beam sensor 125 detects the surface of the rotating new roll. When the tape is detected, the servo power mechanism 9 controls the air shaft 8 on the unwinding station 52 to stop rotating. The pressure roller cylinder 1242 drives the pressure roller 1241 to press the product of the old roll between the changing station 51 and the unwinding station 52 onto the tape of the new roll at the unwinding station 52. At the same time, the rodless cylinder 1211 drives the cutter 1212 to move in the left and right direction to cut the product of the old roll between the changing station 51 and the unwinding station 52. The beginning of the cut product has been bonded to the new roll by the tape. Then, the new roll at the unwinding station 52 is unwound to achieve continuous unwinding. The cutting swing arm mechanism 12 senses the tape on the new material roll through the through-beam sensor 125, and cooperates with the servo power mechanism 9, the pressure roller cylinder 1242 and the rodless cylinder 1211 to realize automatic winding and reduce manual operation.

[0036] like Figure 11As shown, the roller-bending mechanism 13 is installed on the rear side of the cutting swing arm mechanism 12. The roller-bending mechanism 13 includes a swing arm 131 rotatably mounted on the frame 11, a swing roller 132 rotatably mounted on the rear end of the swing arm 131, and a low-friction cylinder 133 that drives the swing arm 131 to swing up and down. Transition aluminum rollers 137 rotatably mounted on the frame 11 are provided above the front and rear sides of the swing roller 132. The products conveyed backward by the cutting swing arm mechanism 12 pass downward over the swing roller 132 by the transition aluminum roller 137 on the front side of the swing roller 132, and then are output backward by the transition aluminum roller 137 on the rear side of the swing roller 132. When the swing roller 132 swings downward, the conveying path of the product in the roller-bearing mechanism 13 increases, and the roller-bearing mechanism 13 temporarily stores the product. When the swing roller 132 swings upward, the conveying path of the product in the roller-bearing mechanism 13 decreases, and the roller-bearing mechanism 13 releases the temporarily stored product. When the product conveying stops at the front of the roller-bearing mechanism 13, the product released by the roller-bearing mechanism 13 can meet the production needs of the subsequent production line until the front of the roller-bearing mechanism 13 continues to convey products backward.

[0037] When the swing roller 132 oscillates up and down, it generates a radial force on the product. The unwinding servo motor 91 needs to adjust the unwinding speed in a timely manner to ensure constant tension conveying of the product during the oscillation of the swing roller 132. A swing gear 134 is coaxially mounted on the swing arm 131 at its rotation point. An angular displacement assembly that meshes with the swing gear 134 is mounted on the frame. This angular displacement assembly includes an angular displacement gear 135 rotatably mounted on the frame 11 and an angular displacement sensor (not shown in the figure) mounted on the angular displacement gear 135. The angular displacement gear 135 meshes with the swing gear 134, and the angular displacement sensor is signal-connected to the servo power mechanism 9. The angular displacement sensor can promptly feed back the oscillation status of the swing roller 132 to the servo power mechanism 9 through the rotation of the angular displacement gear 135, enabling the corresponding servo motor 91 to adjust the unwinding speed in a timely and precise manner.

[0038] The frame 11 is also equipped with a pair of limit blocks 136 arranged opposite each other. The pair of limit blocks 136 are respectively arranged above and below the swing arm 131 to limit the swing range of the swing arm 131 and avoid excessive swinging that could damage the product.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made without departing from the spirit and scope of this application. The scope of protection claimed by this application is defined by the appended claims, specification, and their equivalents.

Claims

1. An automatic unwinding device for film, characterized in that, include A correction device includes a base frame and a correction cylinder. The base frame is configured to be movable in a left-right direction and mounted on the ground. The correction cylinder is driven between the base frame and the ground to drive the base frame to move back and forth in a left-right direction relative to the ground. An active unwinding machine, mounted on the base frame, includes a front-to-back roll changing station and an unwinding station, a pair of air shafts that alternately rotate around a first center line to the unwinding station, a flipping drive mechanism that drives the pair of air shafts to rotate around the first center line, and a servo power mechanism that drives the pair of air shafts to rotate around their own axes. The first center line extends in a left-right direction, and the pair of air shafts are symmetrically arranged on both sides of the first center line and parallel to it. A new roll of material with adhesive tape bonded to its first end is wound on the air shafts at the unwinding station. The flipping drive mechanism and the servo power mechanism are arranged on different sides of the pair of air shafts. An automatic cutting device is mounted on the base frame and located behind the active unwinding machine. The automatic cutting device includes a frame, a cutting swing arm mechanism mounted on the frame, and a roller-shaping mechanism located behind the cutting swing arm mechanism. The cutting swing arm mechanism includes a swing arm having a first end and a second end, a cutting assembly mounted on the second end, a pressure roller assembly mounted on the swing arm, and a through-beam sensor mounted on the pressure roller assembly. The first end of the swing arm is rotatably mounted on the frame. The cutting assembly is used to cut the product in a left-right direction. The pressure roller assembly is configured to press the product between the changing station and the unwinding station onto the new roll of tape at the unwinding station. The through-beam sensor is used to detect the position of the new roll of tape and is signal-connected to the pressure roller assembly, the cutting assembly, and the servo power mechanism. The roller-shaping mechanism includes a swing roller capable of swinging up and down, a low-friction cylinder drively connected to the swing roller, a swing gear oscillating coaxially with the swing roller, and an angular displacement assembly cooperating with the swing gear. The angular displacement assembly is signal-connected to the servo power mechanism.

2. The automatic unwinding device according to claim 1, characterized in that, Multiple slide rail assemblies are installed between the base frame and the ground. Each slide rail assembly includes a guide rail installed on the ground and a slider installed at the bottom of the base frame. The guide rail extends in the left-right direction, and the slider cooperates with the corresponding guide rail.

3. The automatic unwinding device according to claim 1, characterized in that, The correction device also includes a correction probe installed on the rear side of the active unwinder, and the correction probe is signal-connected to the correction electric cylinder.

4. The automatic unwinding device according to claim 1, characterized in that, The active unwinding machine further includes a support frame mounted on the base frame and a flipping mechanism that flips around the first center line on the support frame. The flipping mechanism includes a central shaft assembly extending in the left-right direction and a flipping frame coaxially sleeved on the central shaft assembly. A pair of air shafts are detachably mounted on the flipping frame. The flipping drive mechanism is driven to one end of the central shaft assembly to drive the flipping frame to rotate around the first center line. The servo power mechanism is driven to the other end of the central shaft assembly.

5. The automatic unwinding device according to claim 4, characterized in that, The aforementioned flipping drive mechanism includes a flipping motor and a worm gear assembly that is driven between the central shaft assembly and the flipping motor. The worm gear assembly includes a worm that is driven by the flipping motor and a worm gear that is coaxially arranged with the central shaft assembly. The worm gear meshes with the worm.

6. The automatic unwinding device according to claim 4, characterized in that, The tilting frame is equipped with two pairs of clamping cylinders, each pair of clamping cylinders is arranged opposite to each other and is configured to clamp the air shaft onto the tilting frame.

7. The automatic unwinding device according to claim 1, characterized in that, The cutting assembly includes a rodless cylinder mounted at the second end and a cutter mounted on the rodless cylinder. The rodless cylinder is used to drive the cutter to move back and forth in the left-right direction to cut the product.

8. The automatic unwinding device according to claim 1, characterized in that, The pressure roller assembly includes a pressure roller and a pressure roller cylinder that is drivenly connected to the pressure roller. The pressure roller cylinder is mounted on the swing arm. The pressure roller is mounted on the swing arm in a way that allows it to swing and rotate around its own axis. The pressure roller cylinder is used to drive the pressure roller to press the product between the changing station and the unwinding station onto the new roll at the unwinding station.

9. The automatic unwinding device according to claim 1, characterized in that, The angular displacement component includes an angular displacement gear rotatably mounted on the frame and an angular displacement sensor mounted on the angular displacement gear, wherein the angular displacement sensor is signal-connected to the servo power mechanism.

10. The automatic unwinding device according to claim 1, characterized in that, The frame is also equipped with a pair of limiting blocks arranged opposite each other, which are respectively located above and below the swing roller.

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