A method for constant tension control of a tape reel and a tape reel with a constant tension control mechanism.

Abstract

This invention provides a method for controlling constant tension on a wrapping reel and a wrapping reel with a constant tension control mechanism. The constant tension is controlled using a mechanical structure, which is simple and ingenious, requiring no complex electrical control components. When the wrapping reel is fully loaded with insulating tape, a cam lifts the adjusting rod. As the wrapping progresses, the diameter of the reel gradually decreases, and the pressure roller moves closer to the inside of the reel, causing a swing arm to oscillate. The cam at the other end of the swing arm rotates with the swing arm, causing the adjusting rod to rotate as well. Because the adjusting rod rotates eccentrically, and the longer side of the adjusting rod is closer to the friction wheel, the friction tape is loosened with a larger vertical displacement; the shorter side of the adjusting rod is farther from the friction wheel, tightening the friction tape with a smaller vertical displacement. Overall, the friction tape is loosened, thus reducing the clamping friction torque. This achieves constant tension as the wrapping reel gradually reduces the amount of tape being wrapped.

Description

Technical Field

[0001] This invention relates to the field of insulation wrapping technology for motor coils, and more specifically, to a method for constant tension control of a wrapping reel and a wrapping reel having a constant tension control mechanism. Background Technology

[0002] Motor windings, composed of high-purity conductive metal coils, are key components of motors. The lifespan and operational reliability of a motor depend primarily on the manufacturing quality of its windings. The insulation wrapping process during coil manufacturing is one of the important factors affecting the manufacturing quality of windings.

[0003] The wrapping reel at the wrapping head is equipped with an insulating tape reel. During the wrapping process, the insulating tape on the reel gradually decreases, causing the diameter of the insulating tape reel to gradually decrease. Maintaining constant tension during the wrapping process is crucial to ensure the insulating tape is properly wrapped around the motor coil, guaranteeing the manufacturing quality of the winding.

[0004] Patent application number 201621065572.9, entitled "A Horizontal Strapping Machine with Automatically Adjustable Strapping Tension," discloses a horizontal strapping machine with automatically adjustable strapping tension. It includes: a strapping reel, two symmetrically arranged rocker arms, a first servo motor, a precision resistor, and a second servo motor. The first motor drives the strapping reel to rotate via a main shaft. The first servo motor applies force to the rocker arms, causing them to move. The position signal of the rocker arms is transmitted to the second servo motor through the precision resistor. The position signal of the rocker arms represents the real-time tension of the rocker arms. The second servo motor adjusts the speed of the strapping reel in real time based on the position signal of the rocker arms. Regardless of the speed of the strapping during the wrapping process, the strapping tension remains consistent, ensuring that the shielding layer is evenly wrapped around the outside of the wire. This utility model's horizontal strapping machine is reasonably designed. Through the cooperation of the rocker arms and the tension adjustment device, the strapping tension remains consistent regardless of the speed of the strapping during the wrapping process, ensuring that the shielding layer is evenly wrapped around the outside of the wire.

[0005] Application number CN201821429989.8, patent titled "A Hysteresis Tension Wrapping Machine," discloses a hysteresis tension wrapping machine including a large support plate and a wrapping reel connected to the large support plate. A hysteresis brake is also fixed on the large support plate, connected to a first synchronous pulley. A second synchronous pulley is connected to the wrapping reel, and the first and second synchronous pulleys are driven by a synchronous belt. The advantages of this invention are: by fixing the hysteresis brake on the large support plate and presetting the tension value through the hysteresis brake, the tension on the wrapping reel is automatically adjusted in real time as the amount of wrapping tape on the reel decreases. Different tension values ​​can be preset for different wrapping tape materials, facilitating adjustment and eliminating the hassle of adjusting the mechanical structure on the equipment, simplifying operation and reducing the labor intensity of workers. This device not only improves the quality of cable products, but also achieves true automated production without manual intervention, as the entire tension adjustment system is automatically controlled, improving the efficiency of the entire production line.

[0006] Both of the above tape wrapping machines control the constant tension of the tape electromagnetically, requiring a control system. This method is complex, expensive, and prone to large system errors. Summary of the Invention

[0007] This invention provides a mechanical tape reel tension control method, which reduces the cost of complex electrical control components, has high control precision, and can gradually reduce the clamping friction torque as the tape reel gradually decreases.

[0008] A method for controlling constant tension on a wrapping tape reel involves an adjusting rod rotating eccentrically as the diameter of the insulating tape reel gradually decreases. The adjusting structure is positioned on the longer side of the adjusting rod, with the eccentric point as the center. The longer side of the adjusting rod rotates towards the friction wheel, reducing the compression of the spring in the adjusting structure. This causes one end of the friction belt to relax, gradually reducing the clamping friction torque of the friction belt on the insulating tape reel and achieving constant tension on the wrapping tape reel.

[0009] Existing tape reels typically include a base plate, a friction wheel, a friction belt, an adjusting rod, and an insulating tape reel. The adjusting rod includes an adjusting structure to regulate the tension between the friction belt and the friction wheel. This adjusting structure includes a pin, one end of which passes through the adjusting rod, and the other end is threaded and engages with an adjusting nut. A spring is threaded onto the pin, positioned between the adjusting nut and the adjusting rod. One end of the spring is fixed to the adjusting rod, and the other end presses against the adjusting nut. One end of the friction belt is fixed to the pin, and the other end is fixed to the adjusting rod. When the adjusting nut is tightened, the spring is compressed, lifting the adjusting nut and causing the pin to move upwards. This, in turn, moves one end of the friction belt upwards, tightening the friction wheel. Conversely, when the adjusting nut is loosened, the spring compression decreases, causing the pin to move downwards, and this, in turn, moves one end of the friction belt downwards, loosening the friction wheel. During the wrapping process, the amount of insulating tape on the insulating tape reel gradually decreases, while the clamping friction torque of the friction belt on the friction wheel remains constant. 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 existing technology has a constant clamping friction torque T while R continuously decreases, causing the tension F to increase, which does not meet the requirements of the wrapping process. To ensure constant tension, the clamping friction torque T must be adjusted; that is, as the radius R of the insulating tape reel decreases, the clamping friction torque T must also decrease.

[0010] Since the spring is compressed between the adjusting nut and the adjusting rod, by reducing the compression of the spring, the pin axis can be moved closer to the friction wheel, thus relaxing the friction band.

[0011] The constant tension control method for the insulating tape reel described in this invention involves an adjusting rod equipped with a friction belt that rotates eccentrically as the diameter of the insulating tape reel decreases. The adjusting structure is located at the longer end of the adjusting rod. The longer end of the adjusting rod rotates towards the friction wheel, reducing the spring compression and causing the pin to move axially towards the friction wheel, thus loosening the friction belt with a relatively large vertical displacement. The shorter end of the adjusting rod moves away from the friction wheel, tightening the friction belt. Although there is also vertical displacement, it is smaller due to the eccentric motion. Therefore, overall, the end with the adjusting structure experiences a larger vertical displacement, resulting in a greater overall loosening of the friction belt and a decrease in the clamping friction torque T of the friction belt on the friction wheel.

[0012] It should be noted that in this invention, constant tension refers to a tension range that can guarantee the quality of the strap, rather than a fixed value.

[0013] The present invention also provides a wrapping reel with a constant tension control mechanism, comprising a base plate, a friction wheel, a friction belt, an adjusting rod, and an insulating tape reel; the adjusting rod is movably mounted on the base plate, and the fixing point o between the adjusting rod and the base plate is offset from the center of the adjusting rod; the constant tension control mechanism includes a swing arm, with the fixing point o as the dividing point, and the swing arm is located on the longer side of the adjusting rod; as the diameter of the insulating tape reel gradually decreases, one end of the swing arm moves closer to the insulating tape reel, and the other end drives the longer side of the adjusting rod to rotate towards the insulating tape reel, thereby causing the longer side of the adjusting rod to rotate towards the friction wheel, and the shorter side of the adjusting rod to rotate away from the friction wheel.

[0014] This invention uses a tension control mechanism installed on the wrapping reel to control the tension of the insulating tape. When the reel is full of tape, a cam lifts the adjusting rod, causing it to tilt. Adjusting the adjusting nut ensures the tension of the friction tape against the friction wheel meets the required wrapping tension. As the wrapping progresses, the diameter of the insulating tape reel gradually decreases. One end of the swing rod moves closer to the reel, causing it to swing. The other end of the swing rod rotates with the swing rod, causing the adjusting rod to rotate as well. Because the adjusting rod rotates eccentrically, and its longer side is closer to the friction wheel, the friction tape is loosened more significantly; the shorter side is further away from the friction wheel, tightening the friction tape less. Overall, the friction tape is loosened, ultimately reducing the clamping friction torque T. This achieves a constant tension, where the clamping friction torque T gradually decreases as the wrapping tape decreases, maintaining a constant tension F.

[0015] Furthermore, the constant tension control mechanism also includes a second spring. One end of the second spring is connected to the base plate and is located on the shorter side of the adjusting rod; the other end is connected to the swing rod. Through the elastic force of the second spring, the swing rod always remains close to the insulating tape reel.

[0016] Furthermore, the adjusting rod is equipped with an adjusting nut to adjust the tightness of the friction belt and friction wheel. A spring of the adjusting structure is placed between the nut head of the adjusting nut and the adjusting rod. When the adjusting rod moves downward with the base plate, the spring of the adjusting structure provides support for the adjusting rod.

[0017] Furthermore, the phrase "the other end of the swing arm drives the longer side of the adjusting rod to move towards the insulating tape reel" means that the end of the swing arm closest to the adjusting rod contacts the swing arm, and as the swing arm rotates, the longer side of the adjusting rod rotates towards the insulating tape reel under the action of gravity.

[0018] Furthermore, a cam is fixed at one end of the rocker arm that contacts the adjusting rod, causing the adjusting rod to move along a predetermined trajectory, thereby adjusting the clamping friction torque between the friction belt and the friction wheel.

[0019] Furthermore, the adjusting rod is Z-shaped, with one end of the Z-shaped adjusting rod connected to the base plate via a horizontal bar, and both ends of the friction belt resting on this horizontal bar; the other end of the horizontal bar contacts the rocker arm. If the adjusting rod were a single horizontal bar, the cam would need to contact the horizontal bar, and the cam could not interfere with the friction wheel. Therefore, the cam would protrude from the base plate, potentially obstructing the coil during tape wrapping. Therefore, the adjusting rod is made Z-shaped, directing the contact point between the adjusting rod and the cam to another position on the base plate to prevent the cam from protruding from the base plate.

[0020] Furthermore, the cam is circular, and the connecting rod is eccentrically connected to the circular cam.

[0021] Furthermore, the mounting point between the rocker arm and the base plate is designed so that the cam rotates with the rocker arm but does not extend out of the base plate. This prevents interference between the cam and the coil during the rotation of the tape reel.

[0022] Furthermore, the lever is hook-shaped, bending towards the insulating tape reel. Similarly, this is to prevent the constant tension control mechanism from extending from the base plate and avoiding interference with the coil.

[0023] Furthermore, a pressure roller is fixed at the end of the swing arm that contacts the insulating tape reel.

[0024] The present invention has the following advantages over the prior art:

[0025] This invention provides a method for controlling constant tension on a wrapping reel and a wrapping reel with a constant tension control mechanism. The mechanical structure controls constant tension, and the constant tension control mechanism is simple and ingenious, requiring no complex electrical control components. When the wrapping reel is fully loaded with insulating tape, a cam lifts the adjusting rod, causing it to tilt. Adjusting the adjusting nut ensures the tension of the friction tape and friction wheel meets the required wrapping tension. As the wrapping progresses, the diameter of the reel gradually decreases, and the pressure wheel moves closer to the inside of the reel, causing the swing arm to swing. The cam at the other end of the swing arm rotates with the swing arm, causing the adjusting rod to rotate as well. Because the adjusting rod rotates eccentrically, and the longer side of the adjusting rod is closer to the friction wheel, the friction tape is loosened with a larger vertical displacement; the shorter side of the adjusting rod is further away from the friction wheel, tightening the friction tape with less vertical displacement. Overall, the friction tape is loosened, ultimately reducing the clamping friction torque. This achieves constant tension as the wrapping reel gradually reduces the clamping friction torque as the wrapping tape decreases. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of the principle of adjusting rod rotation.

[0028] Figure 2 This is a schematic diagram of the adjustment rod rotation principle (extreme case).

[0029] Figure 3 This is a diagram of the packaging tape reel structure.

[0030] Figure 4 This is a structural diagram of the strap disc (the torsion spring is detached from the rocker arm).

[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, swing rod-11, pin-12. Detailed Implementation

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

[0033] Example 1

[0034] A method for controlling constant tension on a wrapping reel involves a method whereby, as the diameter of the insulating tape reel 5 gradually decreases, the adjusting rod 4 rotates eccentrically. Centered on the eccentric point, an adjusting structure is positioned on the longer side of the adjusting rod 4. The longer side of the adjusting rod 4 rotates towards the friction wheel 2, reducing the compression of the spring 8 in the adjusting structure. This causes one end of the friction belt 3 to loosen, thereby gradually reducing the clamping friction torque of the friction belt 3 on the insulating tape reel 5, thus achieving constant tension on the wrapping reel.

[0035] Existing wrapping reels typically include a base plate 1, a friction wheel 2, a friction belt 3, an adjusting rod 4, and an insulating tape reel 5. The adjusting rod 4 includes an adjusting nut 6 to adjust the tension between the friction belt 3 and the friction wheel 2. During the wrapping process, the insulating tape on the insulating tape reel 5 gradually decreases, while the clamping friction torque of the friction belt 3 on the friction wheel 2 remains constant. 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 5, the existing structure results in a constant clamping friction torque T while R continuously decreases, leading to an increase in tension F, which does not meet the requirements of the wrapping process. To ensure constant tension, the clamping friction torque T must be adjusted; that is, as the radius R of the insulating tape reel 5 decreases, the clamping friction torque T must also decrease.

[0036] like Figure 1 As shown in the figure, the solid line represents the initial position of the adjusting rod 4, and the dashed line represents the position of the adjusting rod 4 as it rotates a certain angle as the diameter of the insulating tape reel 5 decreases. o is the eccentric point. As the diameter of the insulating tape reel 5 gradually decreases, as... Figure 1 In the center position and direction, the adjusting rod 4 is rotated clockwise, with the eccentric point as the center, such as... Figure 1It can be seen that the longer side rotates towards the friction wheel 2 and descends a greater vertical distance, while the shorter side rotates away from the friction wheel 2 and ascends a smaller vertical distance. That is, the friction band 3 on the longer side of the adjusting rod 4 is relaxed, while the friction band 3 on the shorter side of the adjusting rod 4 is tightened. In general, the longer side is relaxed more, thus reducing the clamping friction torque T of the friction band 3 on the friction wheel 2. To further illustrate the principle of the method described in this embodiment, as follows... Figure 2 As shown, in extreme cases, with one end of the adjusting rod 4 as the eccentric point, such as... Figure 2 When the position of the adjusting rod 4 is rotated clockwise, the longer side of the adjusting rod 4 descends, the friction belt 3 relaxes, while the other side of the friction belt 3 remains unchanged, thereby reducing the clamping friction torque T of the friction belt 3 on the friction wheel 2.

[0037] In summary, according to the formula F=T / R, the clamping friction torque T decreases synchronously with the decrease of the radius R of the insulating tape reel 5, thereby keeping the tension F constant.

[0038] Example 2

[0039] A tape reel with a constant tension control mechanism that implements the constant tension control method of the tape reel in Embodiment 1, such as... Figure 3 and Figure 4 As shown, it includes a base plate, a friction wheel 2, a friction belt 3, an adjusting rod 4, and an insulating belt reel 5; the adjusting rod 4 is movably mounted on the base plate, and the fixing point o of the adjusting rod 4 and the base plate is offset from the center of the adjusting rod 4; the constant tension control mechanism includes a swing arm 11, with the fixing point o as the dividing point, and the swing arm 11 is located on the longer side of the adjusting rod 4;

[0040] like Figure 3 As shown, the adjusting rod 4 includes an adjusting structure to adjust the tightness of the friction belt 3 and the friction wheel 2. The adjusting structure includes a pin 12, one end of which passes through the adjusting rod 4, and the other end is threaded and engages with an adjusting nut 6. A spring 8 is threaded onto the pin 12, and the spring 8 is located between the nut 6 and the adjusting rod 4. One end of the spring 8 is fixed to the adjusting rod 4, and the other end presses against the adjusting nut 6. One end of the friction belt 3 is fixed to the pin 12, and the other end is fixed to the shorter end of the adjusting rod 4.

[0041] As the diameter of the insulating tape reel 5 gradually decreases, one end of the swing rod 11 moves closer to the insulating tape reel 5, while the other end drives the longer side of the adjusting rod 4 to rotate towards the insulating tape reel 5. The compression of the spring 8 in the adjusting structure decreases, and the pin 12 moves downward. Figure 3 (position), so that one end of the friction belt 3 is relaxed, that is, the friction belt 3 on the longer side of the adjusting rod 4 is relaxed; the shorter end of the adjusting rod 4 is rotated away from the friction wheel to tighten the friction belt 3.

[0042] The constant tension control mechanism also includes a second spring 77. One end of the second spring 77 is connected to the base plate and is located on the shorter side of the adjusting rod 4; the other end is connected to the swing rod 11. Through the elastic force of the second spring 7, the swing rod 11 always stays close to the insulating tape reel 5.

[0043] An adjusting nut 6 is provided on the adjusting rod 4 to adjust the tightness of the friction belt 3 and the friction wheel 2. A spring 8 of the adjusting structure is placed between the nut head of the adjusting nut 6 and the adjusting rod 4. When the adjusting rod 4 moves to the bottom with the base plate, the spring 8 of the adjusting structure supports the adjusting rod 4.

[0044] A cam 9 is fixed to the end of the rocker arm 11 that contacts the adjusting rod 4, causing the adjusting rod 4 to move along a predetermined trajectory, thereby adjusting the clamping friction torque between the friction belt 3 and the friction wheel 2. The cam 9 is circular, and the connecting rod is eccentrically connected to the circular cam 9. A pressure roller 10 is fixed to the end of the rocker arm 11 that contacts the insulating tape reel 5.

[0045] The mounting point between the rocker arm 11 and the base plate allows the cam 9 to rotate with the rocker arm 11 but not extend out of the base plate. This prevents interference between the cam 9 and the coil during the rotation of the tape reel.

[0046] The swing arm 11 is hook-shaped and bends towards the insulating tape reel 5. Similarly, this is to prevent the constant tension control mechanism from extending from the base plate and avoiding interference with the coil.

[0047] The adjusting rod 4 is Z-shaped. One end of the Z-shaped adjusting rod 4 is movably connected to the base plate, and both ends of the friction belt 3 are on this horizontal bar; the other end of the horizontal bar contacts the rocker arm 11. If the adjusting rod 4 were a single horizontal bar, the cam 9 would need to contact the horizontal bar, and the cam 9 could not interfere with the friction wheel 2. Therefore, the cam 9 would extend from the base plate 1, potentially obstructing the coil during wrapping. Therefore, the adjusting rod 4 is made Z-shaped, directing the contact point between the adjusting rod 4 and the cam 9 to another position on the base plate 1 to prevent the cam 9 from extending from the base plate 1.

[0048] To achieve good wrapping results, constant tension must be maintained during the wrapping process. This embodiment provides a tension control mechanism that can maintain constant tension during wrapping. This tension control mechanism is mounted on the wrapping reel and is developed and designed using the existing structure of the wrapping reel, as detailed below: Figure 3 and Figure 4 As shown, the tape reel includes a base plate, a friction wheel 2, a friction belt 3, an adjusting rod 4, and an insulating tape reel 5. The friction belt 3 grips the friction wheel 2, and both ends are respectively installed on the adjusting rod 4. The adjusting rod 4 includes an adjusting nut 6 to adjust the tension between the friction belt 3 and the friction wheel 2. The adjusting rod 4 is movably connected to the base plate 360 ​​degrees, and the fixing point o of the adjusting rod 4 and the base plate is offset from the center of the adjusting rod 4. The tension control mechanism includes a swing rod 11 and a spring 7 respectively installed on both sides of the friction wheel 2. Figure 3As shown, with fixed point o as the dividing point, the swing arm 11 is located on the longer side of the adjusting rod 4; the swing arm 11 is movably connected to the base plate 1 by 360 degrees, and cam 9 and pressure roller 10 are fixed at both ends of the swing arm 11 respectively; cam 9 contacts the adjusting rod 4, and pressure roller 10 contacts the insulating tape; as shown Figure 3 As shown, one end of spring 7 is fixed to the base plate, and the other end is connected to the swing rod 11. In this embodiment... Figure 4 The lever 11 was deliberately pulled open to facilitate understanding of the tension control mechanism's structure.

[0049] like Figure 3 As shown in the diagram, when the insulating tape reel 5 is fully loaded, the cam 9 pushes the adjusting rod 4 upward, causing the adjusting rod 4 to tilt to the left. As the insulating tape on the insulating tape reel 5 wraps, the insulating tape reel 5 gradually shrinks, and the pressure roller 10 also moves closer to the inside of the insulating tape reel 5, causing the rocker arm 11 to swing clockwise. This causes the cam 9 at the other end of the rocker arm 11 to move clockwise as well, causing the adjusting rod 4 to rotate clockwise. The right side of the adjusting rod 4, where it contacts the cam 9, descends, while the left side of the adjusting rod 4 rises. Because the adjusting rod 4 is eccentrically mounted, the descending distance is much greater than the ascending distance, resulting in a decrease in the clamping friction torque T, thereby achieving tension adjustment.

[0050] In this embodiment, a tension control mechanism is installed on the wrapping reel to control the tension of the insulating tape. When the reel is full of tape, the cam 9 lifts the adjusting rod 4, causing the adjusting rod 4 to tilt. The adjusting nut 6 is then adjusted so that the tension of the friction tape 3 and the friction wheel 2 meets the tension requirements of the wrapping tape. As the wrapping of the insulating tape continues, the diameter of the reel gradually decreases, and the pressure wheel 10 also moves closer to the inside of the reel, causing the swing rod 11 to swing. The cam 9 at the other end of the swing rod 11 also rotates with the swing rod 11, causing the adjusting rod 4 to rotate as well. The longer side of the adjusting rod 4 rotates towards the friction wheel 2, and the shorter side rotates away from the friction wheel 2. Because the rocker arm 11 rotates eccentrically, the end of the friction belt 3 closer to the mounting point of the adjusting rod 4 rises slightly, while the end farther from the mounting point of the adjusting rod 4 falls more significantly. Overall, the fall is greater, which reduces the compression of the spring 8 and causes the pin 12 to move downward. This reduces the clamping friction torque T of the friction belt 3 on the friction wheel 2, so that as the wrapping disc gradually reduces the wrapping, the clamping friction torque T gradually decreases, keeping the tension F constant and achieving constant tension.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A tape dispenser having a constant tension control mechanism comprising a base plate, a friction wheel, a friction tape, an adjustment lever and an insulation tape dispenser; characterized in that, The adjusting rod is movably installed on the base plate, and the fixed point o of the adjusting rod and the base plate is offset from the center of the adjusting rod; the constant tension control mechanism comprises a swing rod, and the swing rod is located on the longer side of the adjusting rod with the fixed point o as a boundary point; 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 longer side of the adjusting rod to rotate towards the direction of the insulating tape reel, so as to loosen the friction tape on the longer side of the adjusting rod and tighten the friction tape on the shorter side of the adjusting rod; an adjusting nut is arranged on the adjusting rod to adjust the tightness of the friction tape and the friction wheel, and a spring one of the adjusting structure is arranged between the nut head of the adjusting nut and the adjusting rod; when the adjusting rod runs to the lower side with the base plate, the spring one of the adjusting structure supports the adjusting rod.

2. The tape hub with constant tension control mechanism according to claim 1, wherein, The constant tension control mechanism further comprises a spring two, one end of the spring two is connected with the base plate and located on the shorter side of the adjusting rod; the other end is connected with the swing rod, and the swing rod always approaches the insulating tape reel through the elastic force of the spring two.

3. The tape hub having a constant tension control mechanism according to claim 1, wherein, The end of the swing rod in contact with the adjusting rod is fixed with a cam, so that the adjusting rod moves along a specified trajectory, thereby adjusting the gripping friction torque of the friction tape and the friction wheel.

4. The tape hub having a constant tension control mechanism according to claim 3, wherein, The adjusting rod is Z-shaped, one end of the Z-shaped adjusting rod is movably connected with the base plate, and the two ends of the friction tape are on the horizontal rod of the Z-shaped adjusting rod; the other end of the horizontal rod is in contact with the swing rod.

5. The tape hub having a constant tension control mechanism according to claim 1, wherein, The cam is circular, and the connecting rod is eccentrically connected with the circular cam.

6. The tape leader reel having a constant tension control mechanism according to claim 5, wherein, The mounting point of the swing rod and the base plate makes the cam rotate with the swing rod but not extend from the base plate.

7. The tape hub having a constant tension control mechanism according to claim 1, wherein, The end of the swing rod in contact with the insulating tape reel is fixed with a pressure roller.

8. The tape hub having a constant tension control mechanism according to claim 1, wherein, The swing rod is in the shape of a hook, and is curved towards the insulating tape reel.

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