A foil-releasing constant tension automatic control device

Abstract

The present invention belongs to the technical field of metal foil processing, and discloses a foil-unwinding constant tension automatic control device, the control device comprises a foil-unwinding machine and a foil-collecting machine, the foil-unwinding machine and the foil-collecting machine both comprise a frame and a material pressing device arranged on the frame; the material pressing device comprises a first material guide roller for transmitting foil and an eccentric material pressing roller used in conjunction with the first material guide roller, the eccentric material pressing roller has a highest point; the eccentric material pressing roller rotates with the foil conveying, thereby periodically applying pressure to the foil to maintain the tension stability of the foil during frequent start-stop. The foil-unwinding machine in the control device rotates with the rhythm of foil conveying through the eccentric material pressing roller, and its periodic contact and separation mechanism can effectively maintain the tension stability of the foil even in the frequent start-stop stage during the processing process, and avoid foil deviation or damage caused by tension fluctuations.

Description

Technical Field

[0001] The invention belongs to the technical field of metal foil processing, and in particular relates to a foil unwinding constant tension automatic control device. Background Art

[0002] In the delicate operation of foil processing, the accuracy of surface tension control is directly related to the smoothness of the entire processing flow and the final quality of the product. Tension fluctuations not only cause the foil to shift during processing, but may also trigger a series of chain reactions, seriously affecting processing accuracy and foil integrity. For example, a slight deviation during high-speed cutting may cause edge burrs or tears, destroying the product appearance and reducing performance; position deviation during punching directly affects subsequent assembly and functional realization; even after processing is completed, deviation may cause the foil roll to be misaligned left and right, affecting the convenience of subsequent use and the overall quality of the product.

[0003] Especially in the critical process of foil punching, in order to ensure the accuracy and consistency of the holes, the foil transmission often needs to be temporarily stopped. Frequent starts and stops will increase the instability of the foil tension, which may cause unnecessary stretching or relaxation of the foil when it restarts, or even positional displacement.

[0004] In addition, most of the current foil punching equipment uses the traditional mechanical physical puncture method. However, in practice, there are often inconsistencies in the size of the holes, and burrs remain around the holes after punching.

[0005] In summary, it is found that the prior art has at least the following technical problems:

[0006] Existing foil processing equipment is relatively inadequate in terms of the accuracy of foil surface tension control and offset correction performance, as well as the problem of inconsistency between punching accuracy and foil transmission when facing foil punching processing that requires frequent starts and stops. Summary of the invention

[0007] In view of this, the object of the present invention is to provide a foil unwinding constant tension automatic control device to solve the problems existing in the above-mentioned background technology.

[0008] In order to solve the above technical problems, the technical solution of the present invention is a foil unwinding constant tension automatic control device, the control device comprises a foil unwinding machine and a foil rewinding machine, the foil is sent out by the unwinding machine, and after processing, it is rewound by the foil rewinding machine; the foil unwinding machine and the foil rewinding machine both comprise a frame and a pressing device arranged on the frame; the pressing device comprises a first guide roller for transmitting the foil and an eccentric pressing roller used in conjunction with the first guide roller, and the eccentric pressing roller has a highest point; the operating state of the pressing device is divided into a pressing state and a feeding state; when the highest point of the eccentric pressing roller contacts the foil, the pressing device is in a pressing state, the eccentric pressing roller presses the foil downward, and the foil is in close contact with the pressing device; when the highest point of the eccentric pressing roller does not contact the foil, the pressing device is in a feeding state, and the foil can be sent out from the pressing device; the eccentric pressing roller rotates with the foil conveying, thereby periodically applying pressure to the foil to maintain the tension stability of the foil during frequent start and stop.

[0009] Preferably, the foil unwinding machine and the foil collecting machine are respectively provided with a unwinding device and a collecting device, and the unwinding device and the collecting device both comprise an inflatable shaft for placing the foil roll and a magnetic powder clutch for controlling the rotation of the inflatable shaft; when the pressing device is in a pressing state, the magnetic powder clutch stops the rotation of the inflatable shaft; when the pressing device is in a feeding state, the magnetic powder clutch starts the rotation of the inflatable shaft.

[0010] Preferably, the foil unwinding machine further comprises a linear transmission component arranged on the frame and a mounting frame for mounting the unwinding device; the transmission direction of the linear transmission component is the same as the width direction of the frame, and the linear transmission component is used to connect the mounting frame and the frame so that the mounting frame can move in the width direction of the frame, thereby correcting the displacement offset of the foil roll on the unwinding device.

[0011] Preferably, the foil unloading machine also includes a punching device for punching holes in the foil, and the punching device is arranged between the unloading device and the pressing device; the punching device includes a punching part and an execution component for controlling the action of the punching part; when the pressing device enters a pressing state, the execution component controls the punching part to punch holes in the foil and retreat; when the punching device completes the punching operation and retreats, the pressing device enters a feeding state.

[0012] Furthermore, the punching device also includes a top plate and a bottom plate provided with holes, and the foil passes through between the top plate and the bottom plate, and the top plate and the bottom plate are used for limiting and fixing the foil during punching processing; the top plate is hingedly arranged on the frame to facilitate the foil to pass through the punching device when loading.

[0013] Furthermore, the punching member includes a mounting plate, on which a rubbing block is rotatably arranged, the rubbing block is provided with a guide rod on the side and a top cone on the top; the bottom plate is located above the mounting plate, a spring is provided between the bottom plate and the mounting plate, and a guide slope is provided at the lower end of the hole of the bottom plate; when the execution component controls the punching member to rise, the bottom plate contacts the top plate to fix the foil material, allowing the punching member to complete the punching operation of the foil material; after completing the punching operation of the foil material, as the punching member rises, the guide rod contacts the guide slope, allowing the rubbing block to rotate.

[0014] Furthermore, the pressing devices are respectively a first pressing device arranged on the foil unwinding machine and a second pressing device arranged on the foil collecting machine; the foil collecting machine also includes a deflection correction sensing device and a second material guide roller, and the foil passes through the deflection correction sensing device, the second material guide roller and the second pressing device in sequence, and is then rolled up by the collecting device; the deflection correction sensing device feeds back the position of the foil to avoid positional deviation of the foil after foil processing.

[0015] Preferably, the foil collecting machine further comprises a first pressing roller and a protective cover arranged at the bottom end of the foil collecting machine, wherein the first pressing roller is located above the collecting device and moves as the diameter of the foil roll of the collecting device changes.

[0016] Furthermore, the control equipment is equipped with a main control cabinet; the first pressing device is provided with a material sensor and a material shortage alarm, and the material sensor is used to feedback whether the foil to be processed is exhausted. When the foil to be processed is exhausted, the material shortage alarm issues a warning prompt; the material shortage alarm and the material sensor are independent of the main control cabinet to avoid interfering with the alarm priority order of the main control cabinet.

[0017] The technical effects of the present invention are mainly reflected in the following aspects:

[0018] The foil unwinding machine in the control device rotates with the rhythm of foil conveying through the eccentric pressing roller. Its periodic contact and separation mechanism can effectively maintain the tension stability of the foil even in the frequent start and stop stages of the processing process, avoiding foil deviation or damage caused by tension fluctuations. Automated tension control eliminates the need for operators to frequently manually adjust the foil tension, simplifies the operation process, reduces labor intensity, and also reduces the possibility of human error. In addition, the coordinated work of the punching device and the pressing device ensures the fixation and tension control of the foil during the punching process, improves the accuracy and consistency of the hole position, reduces edge burrs and tearing, and improves the appearance quality and functionality of the product. Through the design of magnetic powder clutch and linear transmission components, the feeding and deviation correction of the foil become simpler and more controllable, reducing the difficulty of operation, improving the safety of operation, and reducing the labor intensity of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present invention;

[0020] Figure 2 for Figure 1 Partial structure diagram of the middle foil machine;

[0021] Figure 3 for Figure 1 Side view of the middle foil machine;

[0022] Figure 4 for Figure 1 The structural diagram of the foil collecting machine;

[0023] Figure 5 for Figure 1 Side view of the foil collecting machine;

[0024] Figure 6 for Figure 1 A structural diagram of the first pressing device;

[0025] Figure 7 for Figure 1 Structural diagram of the middle punching device;

[0026] In the figure: 1. foil unwinding machine, 11. linear transmission component, 12. mounting frame; 2. foil collecting machine, 21. deviation correction sensing device, 22. second material guide roller, 23. first material pressing roller, 24. protective cover; 3. first material pressing device, 31. first material guide roller, 32. eccentric material pressing roller, 33. highest point, 34. material shortage alarm; 4. material unwinding device, 41. air shaft, 42. magnetic powder clutch; 5. material collecting device; 6. punching device, 61. executive component, 62. top plate, 63. bottom plate, 64. mounting plate, 65. rubbing block, 66. guide rod, 67. guide slope; 7. second material pressing device. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0028] In this embodiment, it should be understood that the terms "middle", "upper", "lower", "top", "right", "left end", "above", "back", "middle", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, in this specific embodiment, if the connection or fixing method between components is not specifically described, the connection or fixing method can be through bolt fixing or pin fixing, or pin shaft connection and the like commonly used in the prior art, and therefore, it will not be described in detail in this embodiment.

[0030] Embodiment 1

[0031] See also Figure 1 , 2 3.6. A foil unwinding constant tension automatic control device, the control device comprising a foil unwinding machine 1 and a foil collecting machine 2, the foil material is fed out by the unwinding machine, and after being processed, is rewound by the foil collecting machine 2; the foil unwinding machine 1 and the foil collecting machine 2 both comprise a frame and a material pressing device arranged on the frame, the material pressing device is used to control the tension of the foil material;

[0032] See also Figure 6 The pressing device includes a first guide roller 31 for conveying foil and an eccentric pressing roller 32 used in conjunction with the first guide roller 31, and the eccentric pressing roller 32 has a highest point 33; the pressing device composed of the first guide roller 31 and the eccentric pressing roller 32, the eccentric pressing roller 32 rotates with the rhythm of foil conveying, and its periodic contact and separation mechanism can effectively maintain the tension stability of the foil even in the frequent start and stop stages of the processing process, avoiding foil deviation or damage caused by tension fluctuations. Automated tension control eliminates the need for operators to frequently manually adjust the foil tension, simplifies the operation process, reduces labor intensity, and also reduces the possibility of human error.

[0033] The operation state of the pressing device is divided into a pressing state and a feeding state; when the highest point 33 of the eccentric pressing roller 32 contacts the foil, the pressing device is in a pressing state, the eccentric pressing roller 32 presses the foil downward, and the foil and the pressing device are in close contact; when the highest point 33 of the eccentric pressing roller 32 does not contact the foil, the pressing device is in a feeding state, and the foil can be fed out of the pressing device; the eccentric pressing roller 32 rotates with the foil conveying, thereby periodically applying pressure to the foil to maintain the tension stability of the foil during frequent start and stop; when the highest point 33 of the eccentric pressing roller 32 contacts the foil, a pressing state is formed, at which time the pressing roller presses the foil downward to ensure that the foil is in close contact with the pressing device, and prevents the foil from being relaxed or overstretched during the conveying process. When the highest point 33 of the eccentric pressing roller 32 leaves the foil and enters the feeding state, the foil can be conveyed normally.

[0034] See also Figure 1 , 23. The foil unwinding machine 1 and the foil rewinding machine 2 are provided with a material unwinding device 4 and a material rewinding device 5, respectively. The material unwinding device 4 and the material rewinding device 5 both include an inflatable shaft 41 for placing the foil roll and a magnetic powder clutch 42 for controlling the rotation of the inflatable shaft 41; the inflatable shaft 41 is a device for supporting and fixing the foil roll. It usually contains an internally inflated rubber expansion tube. When inflated, the rubber tube expands and tightly grasps the inner diameter of the foil roll, thereby fixing the foil roll. This allows the foil roll to remain stable during processing and facilitates the replacement of the foil roll. The magnetic powder clutch 42 is an electromagnetic clutch that uses a magnetic field to transmit torque. When current passes through the coil, it generates a magnetic field, which magnetizes the magnetic powder particles, thereby increasing the friction between the input shaft and the output shaft, thereby transmitting torque. The advantage of the magnetic powder clutch 42 is that it can control torque transmission very smoothly and steplessly, which is crucial for foil processing because it allows precise control of foil tension.

[0035] When the pressing device is in the pressing state, the magnetic powder clutch 42 stops the rotation of the air shaft 41; when the pressing device is in the feeding state, the magnetic powder clutch 42 starts the rotation of the air shaft 41. Specifically, pressing state: when the pressing device is in the pressing state, the highest point 33 of the eccentric pressing roller 32 contacts the foil and presses the foil downward to maintain tension. In this state, the magnetic powder clutch 42 is activated to stop the rotation of the air shaft 41, which means that the feeding of the foil stops, allowing precise processing steps such as punching without worrying about foil movement or tension changes. Feeding state: when the pressing device is switched to the feeding state, the highest point 33 of the eccentric pressing roller 32 no longer contacts the foil, the magnetic powder clutch 42 is released, allowing the air shaft 41 to start rotating, and the foil can continue to be fed. At this stage, the foil advances at a controlled speed, and the magnetic powder clutch 42 ensures that the tension remains consistent to avoid any distortion or deformation of the foil during feeding.

[0036] See also Figure 2 , 3 The foil unwinding machine 1 further comprises a linear transmission component 11 arranged on the frame and a mounting frame 12 for mounting the unwinding device 4; the linear transmission component 11 can be a slide, a slide rail, a linear ball guide rail, a reciprocating screw structure, etc., all of which are for achieving precise linear motion to ensure the stability and accuracy of the foil roll during the unwinding process. The mounting frame 12 carries the unwinding device 4 and is connected to the frame through the linear transmission component 11. The frame here refers to the main frame structure of the foil unwinding machine 1, which provides a support and positioning basis for the entire device.

[0037] The transmission direction of the linear transmission component 11 is the same as the width direction of the frame, which means that the linear transmission component 11 moves in the lateral direction of the foil roll. When the foil roll is fed into the processing area, its lateral position can be fine-tuned to correct any possible deviation. The linear transmission component 11 is used to connect the mounting frame 12 and the frame, so that the mounting frame 12 can move in the width direction of the frame, thereby correcting the displacement deviation of the foil roll on the unloading device 4. Specifically, through the precise control of the linear transmission component 11, the mounting frame 12 can move in the width direction of the frame, so that the position of the foil roll on the unloading device 4 can be adjusted in real time. To maintain the straightness of the foil during the processing, especially in punching or other fine processing steps that require high precision. The combination of the linear transmission component 11 and the mounting frame 12 enables the foil unloading machine 1 to dynamically correct the lateral displacement of the foil roll and ensure the precise alignment of the foil during the unloading process. Not only the processing accuracy is improved, but also the scrap rate caused by foil deviation is reduced, thereby improving the overall production efficiency and product quality. By using high-quality linear transmission components 11, such as linear ball guides or reciprocating screw structures, long-term reliability and low maintenance costs can be further ensured.

[0038] See also Figure 1 , 3 7. The foil unloading machine 1 further comprises a punching device 6 for punching holes in foil, and the punching device 6 is arranged between the unloading device 4 and the pressing device; the punching device 6 comprises a punching member and an executive component 61 for controlling the action of the punching member; the punching member is responsible for the actual punching operation, and its action is controlled by the executive component 61. When the pressing device enters the pressing state, the executive component 61 controls the punching member to perform a punching operation on the foil and retreat; when the punching device 6 completes the punching operation and retreats, the pressing device enters the feeding state.

[0039] The punching device 6 also includes a top plate 62 and a bottom plate 63 with holes, and the size of the hole is the size of the hole required for the foil. The foil passes between the top plate 62 and the bottom plate 63, and the top plate 62 and the bottom plate 63 are used for limiting and fixing during the punching of the foil; the top plate 62 is hingedly arranged on the frame so that the foil passes through the punching device 6 when loading. The punching member includes a mounting plate 64, on which a rubbing block 65 is rotatably arranged, a reset torsion spring is arranged between the rubbing block 65 and the mounting plate 64, and a guide rod 66 is arranged on the side of the rubbing block 65 and a top cone is arranged at the top; the bottom plate 63 is located above the mounting plate 64, a spring is arranged between the bottom plate 63 and the mounting plate 64, and a guide slope 67 is arranged at the lower end of the hole of the bottom plate 63.

[0040] When the execution component 61 controls the punching member to rise, the bottom plate 63 contacts the top plate 62 to fix the foil material, allowing the punching member to complete the punching operation of the foil material; after completing the punching operation of the foil material, as the punching member rises, the guide rod 66 contacts the guide slope 67, allowing the rubbing block 65 to rotate. Specifically, a rubbing block 65 is provided on the mounting plate 64 of the punching member, and its lateral guide rod 66 and the top cone at the top act together in the punching process of the foil material. The spring between the bottom plate 63 and the mounting plate 64 provides buffering, and the guide slope 67 at the lower end of the hole contacts the guide rod 66 when the punching member rises, prompting the rubbing block 65 to rotate, thereby realizing the exit action after punching.

[0041] Punching process: The pressing device enters the pressing state to press the foil tightly to ensure the stability of the foil during punching. The executive component 61 drives the punching part to operate, the bottom plate 63 contacts the top plate 62 to fix the foil, and the rubbing block 65 punches the foil; the guide rod 66 contacts the guide slope 67 to drive the rubbing block 65 to rotate. After the punching operation is completed, the executive component 61 controls the reset of the punching part, and the reset torsion spring drives the rubbing block 65 to rotate, completing the retraction action of the punching part to avoid additional damage to the foil. The pressing device switches to the feeding state, and the foil continues to be transported forward to prepare for the next punching or processing step.

[0042] See also Figure 1 , 4 , 5, the pressing devices are respectively the first pressing device 3 arranged on the foil unwinding machine 1 and the second pressing device 7 arranged on the foil collecting machine 2; the second pressing device 7 is similar to the first pressing device 3 on the foil unwinding machine 1, and maintains the stability of the tension of the foil material through the periodic contact and separation of the eccentric pressing roller 32. In the foil collecting machine 2, its function is to ensure the uniformity and stability of the foil material tension before the foil material enters the winding stage.

[0043] The foil collecting machine 2 also includes a deflection correction sensing device 21 and a second guide roller 22. After the foil passes through the deflection correction sensing device 21, the second guide roller 22 and the second pressing device 7 in sequence, the foil is rolled up by the collecting device 5. The deflection correction sensing device 21 feeds back the position of the foil to avoid the position deviation of the foil after the foil processing. The deflection correction sensing device 21 is a key sensor component used to detect the position deviation of the foil during the rolling process. It can monitor the deviation of the foil relative to the set path in real time and feed this information back to the control system. Through the feedback of the deflection correction sensing device 21, the control system can adjust the working state of the second pressing device 7 and other related components, correct the lateral position deviation of the foil in time, and prevent the foil from being misaligned left and right when rolling. The second guide roller 22 helps guide the foil to pass through the foil collecting machine 2 smoothly, ensures that the path of the foil before entering the second pressing device 7 is correct, and further assists the deflection correction and tension control of the foil. After the foil has undergone all necessary deflection correction and tension adjustment, the collecting device 5 is responsible for rolling the foil into a neat roll.

[0044] See also Figure 4 , 5 The foil rewinding machine 2 also includes a first press roller 23 and a protective cover 24 arranged at the bottom end of the foil rewinding machine 2. The first press roller 23 is located above the receiving device 5 and moves as the caliber of the foil roll of the receiving device 5 changes. The first press roller 23 is mainly used to continuously apply appropriate pressure on the foil during the foil winding process to ensure that the foil is tightly and orderly wound into a roll. As the caliber of the foil roll gradually increases, the first press roller 23 can adjust its position accordingly and always maintain contact with the foil roll, thereby maintaining the tension and position stability of the foil during the winding process. The dynamic adjustment capability of the first press roller 23 ensures that the foil will not wrinkle or sag due to sudden changes in tension when winding, and also avoids damage to the foil caused by excessive compression.

[0045] See also Figure 1 , 2, 3, 4, 5, the control equipment is equipped with a main control cabinet; the first pressing device 3 is provided with a material sensor and a material shortage alarm 34, the material sensor is used to feedback whether the foil to be processed is exhausted, and when the foil to be processed is exhausted, the material shortage alarm 34 issues a warning prompt; the material shortage alarm 34 and the material sensor are independent of the main control cabinet to avoid interfering with the alarm priority sequence of the main control cabinet. The material shortage alarm 34 is set independently to avoid priority conflicts with other alarm signals in the main control cabinet. In an emergency, the operator can respond quickly to the material shortage alarm, give priority to foil replenishment, and ensure a smooth production process. Through the coordinated use of the material sensor and the material shortage alarm 34, the system can automatically detect and warn of the foil inventory, greatly reducing the frequency of manual inspections and improving production efficiency and the automation level of the production line.

[0046] The technical effects of the present invention are mainly reflected in the following aspects:

[0047] The foil unwinding machine 1 in the control device rotates with the rhythm of foil conveying through the eccentric pressing roller 32. Its periodic contact and separation mechanism can effectively maintain the tension stability of the foil even in the frequent start-stop stage during the processing process, avoiding the deviation or damage of the foil caused by tension fluctuations. The automated tension control eliminates the need for operators to frequently manually adjust the foil tension, simplifies the operation process, reduces labor intensity, and also reduces the possibility of human error. Furthermore, the cooperation between the punching device 6 and the pressing device ensures the fixation and tension control of the foil during the punching process, improves the accuracy and consistency of the hole position, reduces edge burrs and tearing, and improves the appearance quality and functionality of the product. Through the design of the magnetic powder clutch 42 and the linear transmission component 11, the feeding and deviation correction of the foil become simpler and more controllable, reducing the difficulty of operation, improving the safety of operation, and reducing the labor intensity of the operator.

[0048] In addition, as common knowledge in the industry, the aforementioned pneumatic shaft 41, magnetic powder clutch 42, deviation correction sensing device 21, main control cabinet, material sensor and material shortage alarm 34 are common knowledge, so their principles and structures will not be described in detail.

[0049] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A foil unwinding constant tension automatic control device, characterized in that: The control device comprises a foil unwinding machine and a foil collecting machine, the foil is fed out by the foil unwinding machine, and after being processed, is rewound by the foil collecting machine; the foil unwinding machine and the foil collecting machine both comprise a frame and a pressing device arranged on the frame; the pressing device comprises a first guide roller for conveying the foil and an eccentric pressing roller used in conjunction with the first guide roller, the eccentric pressing roller having a highest point; the operating state of the pressing device is divided into a pressing state and a feeding state; when the highest point of the eccentric pressing roller contacts the foil, the pressing device is in a pressing state, the eccentric pressing roller presses the foil downward, and the foil is in close contact with the pressing device; when the highest point of the eccentric pressing roller does not contact the foil, the pressing device is in a feeding state, and the foil can be fed out from the pressing device; the eccentric pressing roller rotates with the foil conveying, thereby periodically applying pressure to the foil to maintain the tension stability of the foil during frequent starts and stops; The foil unloading machine also includes a punching device for punching holes in the foil, and the punching device is arranged between the unloading device and the pressing device; the punching device includes a punching member and an execution member for controlling the action of the punching member; when the pressing device enters a pressing state, the execution member controls the punching member to perform a punching operation on the foil and retreat; when the punching device completes the punching operation and retreats, the pressing device enters a feeding state; The punching device also includes a top plate and a bottom plate provided with holes, and the foil passes through between the top plate and the bottom plate, and the top plate and the bottom plate are used for limiting and fixing during the punching process of the foil; the top plate is hingedly arranged on the frame, so that the foil passes through the punching device when loading; The punching member includes a mounting plate, on which a rubbing block is rotatably arranged, wherein the rubbing block is provided with a guide rod on the side and a top cone on the top; the bottom plate is located above the mounting plate, a spring is provided between the bottom plate and the mounting plate, and a guide slope is provided at the lower end of the hole of the bottom plate; when the execution component controls the punching member to rise, the bottom plate contacts the top plate to fix the foil material, allowing the punching member to complete the punching operation of the foil material; after completing the punching operation of the foil material, as the punching member rises, the guide rod contacts the guide slope, allowing the rubbing block to rotate.

2. The foil unwinding constant tension automatic control device according to claim 1, characterized in that: The foil unwinding machine and the foil collecting machine are respectively provided with a material unwinding device and a material collecting device, and the material unwinding device and the material collecting device both include an air shaft for placing the foil roll and a magnetic powder clutch for controlling the rotation of the air shaft; When the material pressing device is in a material pressing state, the magnetic powder clutch stops the rotation of the air shaft; when the material pressing device is in a material feeding state, the magnetic powder clutch starts the rotation of the air shaft.

3. The foil unwinding constant tension automatic control device according to claim 1, characterized in that: The foil unloading machine further comprises a linear transmission component arranged on the frame and a mounting frame for mounting the unloading device; The transmission direction of the linear transmission component is the same as the width direction of the frame. The linear transmission component is used to connect the mounting frame and the frame so that the mounting frame can move in the width direction of the frame, thereby correcting the displacement offset of the foil roll on the unwinding device.

4. The foil unwinding constant tension automatic control device according to claim 2, characterized in that: The material pressing devices are respectively a first material pressing device arranged on the foil unwinding machine and a second material pressing device arranged on the foil collecting machine; The foil rewinding machine also includes a deflection correction sensing device and a second material guide roller. The foil passes through the deflection correction sensing device, the second material guide roller and the second material pressing device in sequence, and is then reeled up by the material rewinding device. The deflection correction sensing device provides feedback on the position of the foil to avoid positional deviation of the foil after foil processing.

5. The foil unwinding constant tension automatic control device according to claim 4, characterized in that: The foil collecting machine also includes a first pressing roller and a protective cover arranged at the bottom end of the foil collecting machine. The first pressing roller is located above the collecting device and moves as the diameter of the foil roll of the collecting device changes.

6. The foil unwinding constant tension automatic control device according to claim 4, characterized in that: The control equipment is equipped with a main control cabinet; The first pressing device is provided with a material sensor and a material shortage alarm, and the material sensor is used to feedback whether the foil to be processed is exhausted. When the foil to be processed is exhausted, the material shortage alarm issues a warning prompt; The material shortage alarm and the material sensor are independent of the main control cabinet to avoid interfering with the alarm priority sequence of the main control cabinet.

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