Belt releasing mechanism with pure mechanical tension control structure

Abstract

The utility model provides a tape releasing mechanism with a pure mechanical tension control structure, which uses a mechanical structure to control constant tension, and comprises a bottom plate, a baffle plate, and a friction wheel, a friction tape, an adjusting rod, an insulating tape reel, a swing rod and a tension component which are positioned between the bottom plate and the baffle plate, the tension assembly comprises a screw rod, an adjusting nut and a first spring. One end of the friction belt is fixed between the bottom plate and the baffle, and the other end of the friction belt is fixed with the screw rod; along with gradual reduction of the diameter of the insulating tape reel, one end of the swing rod gets close to the insulating tape reel, and the other end of the swing rod drives the adjusting rod to rotate towards the direction of the insulating tape reel, so that the compression amount of the spring I is reduced, the friction tape is loosened, the holding friction torque of the friction tape to the insulating tape reel is gradually reduced, and constant tension of the tape wrapping reel is realized. When the adjusting rod moves, only one end of the friction belt is driven to move, the movement process is simple, and the spring deformation can be conveniently and effectively calculated during calculation, so that the pulling force borne by the friction belt is controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of insulating tape wrapping of motor coils, and more specifically, to a tape unwinding mechanism with a pure mechanical tension control structure. Background Art

[0002] The motor winding composed of high-purity conductive metal coils is a key component of the motor. The life and operating reliability of the motor mainly depend on the manufacturing quality of the winding. The insulation tape treatment during the coil manufacturing process is one of the important factors affecting the winding manufacturing quality.

[0003] The tape reel of the taping head is equipped with an insulating tape reel. During the taping process, the insulating tape on the tape reel gradually decreases, causing the diameter of the tape reel to gradually decrease. During the taping process, constant tension must be maintained to ensure that the insulating tape is well wrapped around the motor coil to ensure the manufacturing quality of the winding.

[0004] The application number is 201621065572.9, and the patent name is a horizontal taping machine with automatic adjustment of taping tension. A horizontal taping machine with automatic adjustment of taping tension is disclosed, which includes: a taping disk, two symmetrically arranged swing arms, a first servo motor, a precision resistor, and a second servo motor. The first motor drives the taping disk to rotate through the main shaft, and the first servo motor gives the swing arm force to drive the swing arm to move. The position signal of the swing arm is transmitted to the second servo motor through the precision resistor, wherein the position signal of the swing arm represents the real-time tension of the swing arm. The second servo motor adjusts the speed of the taping disk in real time through the position signal of the swing arm. Regardless of the speed of the tape during the wrapping process, the tension of the tape is always consistent, so that the shielding layer can be evenly wrapped around the outside of the wire. The horizontal taping machine of the utility model is reasonably designed. Through the cooperation of the swing arm and the tension control device, regardless of the speed of the tape during the wrapping process, the tension of the tape is always consistent, so that the shielding layer can be evenly wrapped around the outside of the wire.

[0005] The application number is 201821429989.8, and the patent name is a hysteresis tension wrapping machine. A hysteresis tension wrapping machine is disclosed, including a large bracket plate and a tape wrapping disk connected to the large bracket plate. A hysteresis brake is also fixed on the large bracket plate, and the hysteresis brake is connected to a first synchronous wheel, and the tape wrapping disk is connected to a second synchronous wheel, and the first synchronous wheel and the second synchronous wheel are driven by a synchronous belt. The advantages of the utility model are: by fixing the hysteresis brake on the large bracket plate, the tension value is preset through the hysteresis brake, and as the amount of tape wrapping on the tape wrapping disk continues to decrease, the tension on the tape wrapping is also automatically adjusted in real time. Different tension values ​​can also be preset for different tape wrapping materials, which is convenient for adjustment, eliminating the trouble of adjusting the mechanical structure on the equipment, facilitating operation, and reducing the labor intensity of workers. The device not only improves the quality of cable products, but also the entire tension adjustment system is automatically controlled without manual intervention, truly realizing automated production and improving the efficiency of the entire production line.

[0006] The above two types of taping machines both control the constant tension of the taping by electromagnetic means, which requires a control system. This method has a complex structure, high cost and large system error.

[0007] The application number is 202210821388.6, and the patent name is a Chinese invention patent application for a constant tension control method for a tape reel and a tape reel with a constant tension control mechanism. The patent application was applied for by the applicant of the utility model. The constant tension control mechanism in the patent application is a purely mechanical structure, and a Z-shaped adjusting rod and a rocker arm are provided. When the insulating tape reel is full of tape, the cam lifts the adjusting rod, and the insulating tape on the reel gradually reduces the diameter of the reel as the winding proceeds, and the pressure wheel also moves closer to the inner side of the reel, causing the rocker arm to swing, and the cam at the other end of the rocker arm also rotates with the rocker arm, causing the adjusting rod to rotate. Since the adjusting rod rotates eccentrically, and the longer side of the adjusting rod is close to the friction wheel, the friction belt is loosened, and the vertical displacement is large; the shorter side of the adjusting rod is away from the friction wheel, the friction belt is tightened, and the vertical displacement is small, so that the friction belt is generally relaxed, thereby ultimately reducing the clamping friction torque, so that the tape reel gradually reduces as the tape is wrapped, and the clamping friction torque gradually decreases, thereby achieving constant tension. The tension of the friction belt is controlled by a spring. When the Z-shaped adjustment rod rotates, both ends are moving, and one end is close to the insulating belt reel, while the other end is far away from the insulating belt reel. The movement process is complicated. When designing, the spring deformation cannot be calculated conveniently and effectively, making it difficult to control the tension of the friction belt. If the tension of the friction belt can be effectively controlled and calculated, the friction force (holding friction torque) on the friction wheel can be accurately controlled, and then the reel torque can be controlled so that the tension of the insulating belt always fluctuates at a fixed value with the reel diameter to form a constant tension. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a tape unwinding mechanism with a purely mechanical tension control structure. The movement process of the tension control structure is simple. During calculation, the spring deformation can be conveniently and effectively calculated, thereby controlling the tension exerted on the friction belt, so that the tension of the insulating belt always fluctuates at a fixed value as the diameter of the tape reel changes, thereby forming a constant tension.

[0009] A tape unwinding mechanism with a purely mechanical tension control structure comprises a base plate and a baffle, and a friction wheel, a friction belt, an adjusting rod, an insulating tape reel, a swing rod and a tension component located between the base plate and the baffle; the tension component comprises a screw rod, an adjusting nut and a spring, one end of the screw rod passes through the adjusting rod, and the other end is provided with an adjusting nut, and the spring is located between the adjusting nut and the adjusting rod; the adjusting rod is movably mounted on the base plate, and the swing rod is movably mounted on the base plate; one end of the friction belt is fixed between the base plate and the baffle, and the other end is fixed to the screw rod; as the diameter of the insulating tape reel gradually decreases, one end of the swing rod approaches the insulating tape reel, and the other end drives the adjusting rod to rotate in the direction of the insulating tape reel, thereby relaxing the friction belt, and gradually reducing the clamping friction torque of the friction belt on the insulating tape reel, thereby achieving constant tension of the tape reel.

[0010] The difference between the present invention and the third patent described in the background technology is that one end of the friction belt of the present invention is fixed to the bottom plate or baffle, and the other end is fixed to the screw rod; one end of the friction belt of the reference document is fixed to the shorter end of the adjustment rod, and the other end is fixed to the screw rod. The design of the present invention solves the technical problems of the reference document's adjustment rod moving at both ends when rotating, which results in a complex movement process and difficult calculation of spring deformation. When the adjustment rod of the present invention rotates, only one end of the friction belt moves, and the other end of the friction belt is fixed, so that the spring deformation can be conveniently and effectively controlled during the design, thereby controlling the tension of the friction belt.

[0011] During the tape wrapping process, the insulating tape on the insulating tape reel gradually decreases, while the clamping friction torque of the friction tape on the friction wheel does not change. According to the formula F=T / R, where F is the tension, T is the clamping friction torque, and R is the radius of the insulating tape reel, the structure of the prior art has a constant clamping friction torque T, while R is constantly decreasing, causing the tension F to increase, which does not meet the process requirements of tape wrapping. If the tension is to be kept constant, the clamping friction torque T must be reduced, that is, as the radius R of the insulating tape reel decreases, the clamping friction torque T must also be reduced. Since the spring is compressed between the adjusting nut and the adjusting rod, by reducing the compression of the spring, the screw can be moved toward the friction wheel, causing the friction tape to relax and the clamping friction torque T to decrease.

[0012] The present invention is the same as the third patent in the background technology. As the diameter of the insulating tape reel gradually decreases, one end of the swing rod moves closer to the insulating tape reel, and the other end drives the adjustment rod to rotate toward the insulating tape reel, thereby loosening the friction belt and gradually reducing the friction torque of the friction belt on the friction wheel 2, so as to achieve constant tension of the tape reel. It is particularly noted that only one end of the friction belt of the present invention is movable, and the other end is fixed.

[0013] It should also be noted that the constant tension in the present invention refers to a tension range that can ensure the quality of the tape, rather than a fixed value.

[0014] Furthermore, the adjusting rod is movably mounted on the bottom plate, which means that an end of the adjusting rod close to the fixed end of the friction belt is movably connected to the bottom plate.

[0015] The end of one end of the adjusting rod of the utility model is movably connected to the bottom plate; the two ends of the adjusting rod of the comparative document are not connected to the bottom plate, but the middle part of the adjusting rod is connected to the bottom plate, and the adjusting rod performs eccentric movement.

[0016] Furthermore, the friction belt is fixed to the baffle through an adjusting block, the adjusting block includes an adjusting block 1 and an adjusting block 2, the adjusting block 1 is fixed to the baffle, the adjusting block 2 is fixed to the adjusting block 1, and the friction belt is fixed to the adjusting block 2.

[0017] Furthermore, the adjustment block one is in the shape of a "7", the first side of the "7"-shaped adjustment block one is fixedly connected to the baffle, and there is a gap between the "7"-shaped adjustment block one and the bottom plate; the second side of the "7"-shaped adjustment block one is located between the first side and the bottom plate, the adjustment block two is installed on the second side, and the friction belt passes through the gap and is fixed to the adjustment block two.

[0018] Furthermore, the second adjusting block is threadably connected to the first adjusting block, and the tension of the friction belt can be adjusted by twisting the second adjusting block.

[0019] Furthermore, the adjusting nut can be removed from the screw rod to facilitate replacement of different springs.

[0020] Furthermore, the adjustment rod is Z-shaped, a cross bar at one end of the Z-shaped adjustment rod is movably connected to the bottom plate, and a cross bar at the other end is in contact with the swing rod.

[0021] Furthermore, it also includes a spring 2, one end of which is connected to the bottom plate, and the other end is connected to the swing rod. Through the elastic force of the spring 2, the swing rod always remains close to the insulating tape reel.

[0022] Furthermore, the rocker arm includes a cam, a pressure wheel and a connecting rod connecting the cam and the pressure wheel, and the connecting rod is movably connected to the base plate; a cam is fixed to the end of the rocker arm that contacts the adjusting rod, so that the adjusting rod moves along a prescribed trajectory, thereby adjusting the clamping friction torque between the friction belt and the friction wheel; the pressure wheel contacts the insulating belt reel.

[0023] Furthermore, the cam is circular, and the connecting rod is eccentrically connected to the circular cam.

[0024] Furthermore, the mounting point of the rocker arm to the base plate allows the cam to rotate with the rocker arm but not extend from the base plate.

[0025] The utility model has the following beneficial effects compared with the prior art:

[0026] The utility model provides a tape unwinding mechanism with a purely mechanical tension control structure, which uses a mechanical structure to control the constant tension. The tension control structure has a simple motion process, a simple structure, and is delicate, and does not require the use of complex electrical control elements. When the insulating tape reel is full of tape, the cam lifts the adjustment rod to tilt the adjustment rod, and the adjustment nut is adjusted to make the tightness of the friction belt and the friction wheel meet the tension requirement of the tape wrapping. As the insulating tape on the reel is wrapped, the diameter of the reel gradually decreases, and the pressure wheel also moves closer to the inner side of the reel, causing the swing rod to swing, and the cam at the other end of the swing rod also rotates with the swing rod, causing the adjustment rod to rotate, so that the compression amount of the spring 1 is reduced, and the screw fixed with one end of the friction belt is relaxed and extended from the adjustment rod, so that the friction belt is relaxed, that is, the clamping friction torque of the friction belt on the friction wheel is reduced, so that the tape reel is gradually reduced as the tape is wrapped, and the clamping friction torque is gradually reduced, so as to achieve constant tension. One end of the friction belt is fixed, and the other end fixed to the screw is free to move with the screw. Therefore, during design calculation, the deformation of spring 1 can be calculated conveniently and effectively, thereby controlling the tension on the friction belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0028] Figure 1 The present invention is a schematic diagram of the structure of a tape reel with a constant tension control mechanism in the prior art.

[0029] Figure 2 It is a structural schematic diagram of a tape unwinding mechanism (with baffle) of the utility model with a purely mechanical tension control structure.

[0030] Figure 3 It is a structural schematic diagram of the tape unwinding mechanism of the utility model with a purely mechanical tension control structure (with a hidden baffle).

[0031] Base plate-1, friction wheel-2, friction belt-3, adjusting rod-4, insulating belt reel-5, adjusting nut-6, spring two-7, spring one-8, cam-9, pressure wheel-10, connecting rod-11, screw rod-12, adjusting block one-13, adjusting block two-14, baffle-15. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims. Example

[0033] It is pointed out in the background technology that most of the existing tape wrapping machines control the constant tension of the tape by electromagnetic means, which requires a control system with complex structure, high cost and large system error. A patent applied for by the applicant in the background technology solves the technical problems existing in the electromagnetic method, but the patent still has technical problems such as complex movement process and difficulty in calculating spring deformation. Because the deformation law of the spring determines the variation law of the tension of the friction belt 3, the selection of the spring is very important to achieve constant tension control of a purely mechanical structure. Figure 1As shown, the patent includes a base plate 1 and a baffle 15, and a friction wheel 2, a friction belt 3, an adjustment rod 4, an insulating belt reel 5, a swing rod and a tension component located between the base plate 1 and the baffle 15. The tension component includes a screw rod 12, an adjustment nut 6 and a spring 8. One end of the screw rod 12 passes through the adjustment rod 4, and the other end is provided with an adjustment nut 6. The spring 8 is located between the adjustment nut 6 and the adjustment rod 4. The adjustment rod 4 is movably mounted on the base plate 1, and the swing rod is movably mounted on the base plate 1. The adjustment rod 4 is Z-shaped, and the adjustment rod 4 rotates eccentrically. The eccentric point o divides the adjustment rod 4 into a longer end and a shorter end. The swing rod uses the eccentric point o as the dividing point, and the swing rod is located on the longer side of the adjustment rod 4. The swing arm includes a cam 9, a pressure wheel 10 and a connecting rod connecting the cam 9 and the pressure wheel 10, and the connecting rod is movably connected to the bottom plate 1; the end of the swing arm in contact with the adjustment rod 4 is fixed with a cam 9, so that the adjustment rod 4 moves along a specified track; the pressure wheel 10 is in contact with the insulating tape reel 5. The screw 12 of the tension assembly passes through the longer end of the adjustment rod 4, one end of the friction belt 3 is fixed to the shorter end of the adjustment rod 4, and the other end of the friction belt 3 is fixed to the protruding end of the screw 12. When the insulating tape reel 5 is full of tape, the cam 9 lifts the adjusting rod 4. As the insulating tape on the reel 5 is wrapped, the diameter of the reel 5 gradually decreases, and the pressure wheel 10 also moves closer to the inner side of the reel 5, causing the rocker arm to swing. The cam 9 at the other end of the rocker arm also rotates with the rocker arm, causing the adjusting rod 4 to rotate. Since the adjusting rod 4 rotates eccentrically and the longer side of the adjusting rod 4 is close to the friction wheel 2, the friction belt 3 is loosened, and the vertical displacement is large; the shorter side of the adjusting rod 4 is away from the friction wheel 2, the friction belt 3 is tightened, and the vertical displacement is small, so that the friction belt 3 is generally loosened, thereby ultimately reducing the holding friction torque, so that the holding friction torque of the tape reel 5 gradually decreases as the tape is wrapped, thereby achieving constant tension.

[0034] In the above mechanical structure of the prior art, both ends of the friction belt 3 move, which makes the movement process complicated and makes it difficult to calculate the spring deformation.

[0035] In order to solve the above technical problems, this application makes improvements based on the patent, as follows:

[0036] A tape unwinding mechanism with a purely mechanical tension control structure, such as Figure 2 and 3As shown, it includes a base plate 1 and a baffle 15, and a friction wheel 2, a friction belt 3, an adjusting rod 4, an insulating belt reel 5, a swing rod and a tension component located between the base plate 1 and the baffle 15; the tension component includes a screw rod 12, an adjusting nut 6 and a spring 8, one end of the screw rod 12 passes through the adjusting rod 4, and the other end is provided with an adjusting nut 6, and the spring 8 is located between the adjusting nut 6 and the adjusting rod 4; the adjusting rod 4 is movably mounted on the base plate 1, and the swing rod is movably mounted on the base plate 1; one end of the friction belt 3 is fixed to the baffle 15, and the other end is fixed to the screw rod 12; as the diameter of the insulating belt reel 5 gradually decreases, one end of the swing rod approaches the insulating belt reel 5, and the other end drives the adjusting rod 4 to rotate in the direction of the insulating belt reel 5, thereby relaxing the friction belt 3, and gradually reducing the clamping friction torque of the friction belt 3 on the insulating belt reel 5, so as to achieve constant tension of the wrapping reel 5.

[0037] In the above design, one end of the insulating tape is fixed to the baffle 15, and the other end is still fixed to the extended end of the screw 12. When the adjusting rod 4 is rotated to relax and extend the screw 12, only one end of the insulating tape moves freely, and the end of the insulating tape fixed to the baffle 15 is stationary, which simplifies the movement process and facilitates the calculation of the compression amount of the spring.

[0038] The end of the adjusting rod 4 close to the fixed end of the friction belt 3 is movably connected to the bottom plate 1. Because the friction belt 3 is not fixed to one end of the adjusting rod 4, the adjusting rod 4 can be shortened and the end of the adjusting rod 4 can be directly fixed to the bottom plate 1.

[0039] As shown in the figure, the friction belt 3 is fixed to the baffle 15 through an adjusting block. The adjusting block includes an adjusting block 13 and an adjusting block 2 14. The adjusting block 13 is fixed to the baffle 15, the adjusting block 2 14 is fixed to the adjusting block 13, and the friction belt 3 is fixed to the adjusting block 2 14.

[0040] The adjusting block 13 is in the shape of a letter "7", the first side of the adjusting block 13 being fixedly connected to the baffle 15 and having a gap with the bottom plate 1; the second side of the adjusting block 13 being located between the first side and the bottom plate 1, the adjusting block 2 14 being installed on the second side, and the friction belt 3 passing through the gap and being fixed to the adjusting block 2 14.

[0041] The second adjusting block 14 is threadedly connected to the first adjusting block 13 , and the tension of the friction belt 3 can be adjusted by screwing the second adjusting block 14 .

[0042] The adjusting nut 6 can be removed from the screw rod 12 to facilitate replacement of different springs 8.

[0043] It also includes a spring 2 7, one end of which is connected to the bottom plate 1, and the other end is connected to the swing rod. Through the elastic force of the spring 2 7, the swing rod always keeps close to the insulating tape reel 5.

[0044] The cam 9 is circular, and the connecting rod is eccentrically connected to the circular cam 9.

[0045] The mounting point of the rocker arm and the base plate 1 allows the cam 9 to rotate with the rocker arm but not extend from the base plate 1 .

[0046] How this application works:

[0047] According to the formula F=T / R, F is the tension, T is the clamping friction torque, and R is the radius of the insulating tape reel 55; when wrapping the tape, R is gradually reduced, so in order to ensure constant tension, T also needs to be gradually reduced. Figure 2 In the position direction shown, when the reel 5 is full of tape, the cam 9 lifts the adjusting rod 4 to tilt the adjusting rod 4, and adjusts the adjusting nut 6 to make the tightness of the friction belt 3 and the friction wheel 2 meet the tension requirements of the tape wrapping, or unscrew the adjusting nut 6 and replace it with a spring 8 that meets the requirements. As the insulating tape on the reel 5 is wrapped, the radius R of the reel 5 gradually decreases, and the end of the swing rod with the pressure wheel 10 gradually moves closer to the reel 5, causing the swing rod to rotate clockwise, and the end of the swing rod with the cam 9 drops, causing the adjusting rod 4 to rotate clockwise, the compression of the spring 8 decreases, the screw 12 moves down, and one end of the friction belt 3 relaxes, so that the clamping friction torque gradually decreases, the tension F is kept unchanged, and constant tension is achieved.

[0048] When designing the present application, the tension of the friction belt 3, i.e., the friction force on the friction wheel 2, is controlled by selecting a spring with a suitable compression rule to ensure that the purely mechanical structure of the present application can achieve the function of constant tension. A cam 9 is provided to move the adjustment rod 4 along a prescribed trajectory. Further, the adjustment block 2 14 is provided to be threadedly connected with the adjustment block 1 13, and the tension of the friction belt 3 can be adjusted (fine-tuned) by twisting the adjustment block 2 14. The selection of a suitable spring 1 8, the setting of the cam 9, and the threaded connection of the adjustment block 2 14 with the adjustment block 1 13 ensure the realization of constant tension.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention.

Claims

1. A tape unwinding mechanism with a purely mechanical tension control structure, comprising a bottom plate and a baffle, and a friction wheel, a friction belt, an adjusting rod, an insulating belt reel, a swing rod and a tension component located between the bottom plate and the baffle; the tension component comprises a screw rod, an adjusting nut and a spring 1, one end of the screw rod passes through the adjusting rod, and the other end is provided with an adjusting nut, and the spring 1 is located between the adjusting nut and the adjusting rod; the adjusting rod is movably mounted on the bottom plate, and the swing rod is movably mounted on the bottom plate; characterized in that, One end of the friction belt is fixed between the bottom plate and the baffle, and the other end is fixed to the screw rod; as the diameter of the insulating tape reel gradually decreases, one end of the swing rod moves closer to the insulating tape reel, and the other end drives the adjusting rod to rotate toward the insulating tape reel, thereby relaxing the friction belt and gradually reducing the friction torque of the friction belt on the insulating tape reel, thereby achieving constant tension of the tape reel.

2. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 1, characterized in that: The adjusting rod is movably mounted on the bottom plate means that the end of the adjusting rod close to the fixed end of the friction belt is movably connected to the bottom plate.

3. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 1, characterized in that: The friction belt is fixed to the baffle plate through an adjusting block. The adjusting block comprises an adjusting block 1 and an adjusting block 2. The adjusting block 1 is fixed to the baffle plate, the adjusting block 2 is fixed to the adjusting block 1, and the friction belt is fixed to the adjusting block 2.

4. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 3, characterized in that: The adjusting block 1 is in the shape of a "7", the first side of the "7"-shaped adjusting block 1 is fixedly connected to the baffle, and there is a gap between the adjusting block 1 and the bottom plate; the second side of the "7"-shaped adjusting block 1 is located between the first side and the bottom plate, the adjusting block 2 is installed on the second side, and the friction belt passes through the gap and is fixed to the adjusting block 2.

5. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 4, characterized in that: The second adjusting block is threadedly connected to the first adjusting block, and the tension of the friction belt can be adjusted by twisting the second adjusting block.

6. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 1, characterized in that: The adjusting nut can be removed from the screw rod, which is convenient for replacing different springs.

7. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 1, characterized in that: The adjusting rod is in a Z shape, a cross bar at one end of the Z-shaped adjusting rod is movably connected to the bottom plate, and a cross bar at the other end is in contact with the swing rod.

8. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 1, characterized in that: It also includes a second spring, one end of which is connected to the bottom plate, and the other end is connected to the swing rod. Through the elastic force of the second spring, the swing rod is always kept close to the insulating tape reel.

9. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 8, characterized in that: The rocker arm includes a cam, a pressure wheel and a connecting rod connecting the cam and the pressure wheel, and the connecting rod is movably connected to the base plate; a cam is fixed to the end of the rocker arm that contacts the adjusting rod, so that the adjusting rod moves along a specified trajectory, thereby adjusting the clamping friction torque between the friction belt and the friction wheel; the pressure wheel contacts the insulating belt reel.

10. The tape unwinding mechanism with a purely mechanical tension control structure according to claim 9, characterized in that: The cam is circular, and the connecting rod is eccentrically connected to the circular cam.

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