CN220033543U - Tension control mechanism and calendaring equipment - Google Patents

Abstract

The utility model discloses a tension control mechanism and calendaring equipment, the tension control mechanism comprises a side plate, two fixed roller assemblies and a swing roller assembly, wherein the two fixed roller assemblies comprise fixed rollers rotatably arranged on the first side of the side plate and fixed roller driving structures for driving the fixed rollers to rotate, the swing roller assembly comprises swing structures arranged on the first side of the side plate, swing rollers rotatably arranged on the swing structures and swing roller driving structures for driving the swing rollers to rotate, the swing rollers are arranged between the fixed rollers of the two fixed roller assemblies along a travelling path of a diaphragm, and the swing structures are used for changing positions of the swing rollers relative to the fixed rollers of the two fixed roller assemblies. The utility model can avoid the elongation or breaking of the membrane due to the fact that the feeding tension exceeds the tension range born by the membrane, and can be used for tension control of strips such as lithium foil, film and the like which are easy to damage.

Description

Tension control mechanism and calendaring equipment

Technical Field

The utility model relates to the technical field of micro-tension control, in particular to a tension control mechanism and calendaring equipment.

Background

In the production of lithium battery pole pieces, it is common to calender a composite lithium strip into a thin lithium strip and composite it onto a substrate, such as copper foil, to form the pole piece. In the process of feeding the composite lithium strip, copper foil, pole piece and other films, a tension control mechanism is generally adopted to control the tension of the films. The existing tension control mechanism generally comprises a fixed roller and a swing roller, wherein the fixed roller and the swing roller are driven rollers, and when the diaphragm bypasses the fixed roller and the swing roller, the diaphragm cannot be actively conveyed, so that larger friction force exists between the diaphragm and the fixed roller and between the diaphragm and the swing roller in the process of diaphragm tape feeding, the diaphragm is easily elongated or broken, and the tension control mechanism cannot be used for tension control of strips such as lithium foil and films which are easy to damage.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a tension control mechanism and calendaring equipment, which can avoid stretching or breaking the membrane, and can be used for controlling the tension of strips such as lithium foil, film and the like which are easy to damage.

The technical scheme adopted for solving the technical problems is as follows:

the first aspect of the utility model provides a tension control mechanism, which comprises a side plate, two fixed roller assemblies and a swing roller assembly, wherein the two fixed roller assemblies comprise fixed rollers rotatably arranged on a first side of the side plate and fixed roller driving structures for driving the fixed rollers to rotate, the swing roller assembly comprises a swing structure arranged on the first side of the side plate, a swing roller rotatably arranged on the swing structure and a swing roller driving structure for driving the swing roller to rotate, the swing roller is arranged between the fixed rollers of the two fixed roller assemblies along a travelling path of a diaphragm, and the swing structure is used for changing the position of the swing roller relative to the fixed rollers of the two fixed roller assemblies.

As the preferable technical scheme, two fixed roller assemblies are all including setting up the fixed roller support of the first side of curb plate, the one end of fixed roller support is equipped with the fixed roller mounting groove that extends along the length direction of fixed roller support, the fixed roller is located in the fixed roller mounting groove, the fixed roller be close to the one end of curb plate with the curb plate is relative, the fixed roller mounting groove keep away from one side inner wall of curb plate is equipped with the fixed roller mounting hole, the fixed roller keep away from the one end of curb plate passes through the bearing rotationally and sets up in the fixed roller mounting hole, fixed roller drive structure includes the fixed roller motor, the fixed roller motor sets up on the fixed roller support, the fixed roller motor is used for the drive the fixed roller rotates.

As the preferable technical scheme, the swing structure comprises a rotating shaft and two swing arms, wherein the rotating shaft is rotatably arranged on the first side of the side plate, the two swing arms are arranged at intervals along the axis direction of the rotating shaft, one ends of the two swing arms are respectively connected with the rotating shaft, two swing arm mounting holes are respectively formed in the other ends of the two swing arms, two ends of the swing roller are rotatably arranged in the two swing arm mounting holes through bearings respectively, and the swing roller is located below the rotating shaft.

As an optimized technical scheme, the swing roller driving structure comprises a swing roller motor, wherein the swing roller motor is arranged on one of swing arms, and the swing roller motor is used for driving the swing roller to rotate.

As the preferable technical scheme, the one end of pivot is passed the through-hole of curb plate and is located outside the second side of curb plate, and be connected with and be close the cam, it can be along with the synchronous rotation of pivot to be close the cam, the second side of curb plate is equipped with the sensor, the sensor is located be close one side of cam, and the detection end of sensor with be close the circumference of cam relatively, the sensor is used for detecting the distance between its detection end and the circumference of being close the cam, thereby can realize detecting the rotation angle of pivot, and then can realize detecting the swing range of pendulum roller.

As the preferable technical scheme, the one end of pivot is passed the through-hole of curb plate and is located outside the second side of curb plate, and be connected with the counter weight strip, the counter weight strip is the tilt up setting, can dismantle on the counter weight strip and be provided with the balancing weight, the balancing weight is in the ascending position of length direction of counter weight strip is adjustable.

As the preferable technical scheme, the second side of curb plate is equipped with pivot drive structure, the one end of pivot passes the through-hole of curb plate is located outside the second side of curb plate, and with pivot drive structure is connected, pivot drive structure is used for the drive the pivot rotates, thereby through two swing arms can drive the swing roller swing.

As the preferable technical scheme, the fixed roller and the swinging roller are carbon fiber rollers or aluminum rollers.

As a preferable technical scheme, the bearing is a low-friction bearing, and the low-friction bearing is a ceramic ball bearing.

A second aspect of the present utility model provides a calendaring apparatus, comprising a tension control mechanism according to the above technical scheme.

The beneficial effects of the utility model are as follows: the fixed roller and the swing roller can be respectively driven to rotate by the fixed roller driving structure and the swing roller driving structure, so that the fixed roller and the swing roller become driving rollers, and the film can be actively conveyed by the fixed roller and the swing roller, so that the tension of the film can be stably maintained at a tiny constant value in the film feeding process, the film is prevented from being stretched or broken, and the film tension control device can be used for tension control of strips such as lithium foil and films which are easy to damage.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a schematic view of a first angle of a tension control mechanism according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a second angle of the tension control mechanism of FIG. 1;

FIG. 3 is an exploded schematic view of the tension control mechanism shown in FIG. 1;

fig. 4 is a schematic view of a second angle of an alternative to the tension control mechanism shown in fig. 1.

Detailed Description

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.

Referring to fig. 1 to 3, a tension control mechanism according to an embodiment of the present utility model includes a side plate 10, two fixed roller assemblies 20 and a swing roller assembly 30. The two fixed roller assemblies 20 are arranged up and down oppositely, and the swing roller assembly 30 is positioned on one side of the two fixed roller assemblies 20. In this embodiment, the two fixed roller assemblies 20 and the swing roller assembly 30 are disposed at a left-right interval.

The fixed roller assembly 20 includes a fixed roller bracket 22, a fixed roller 23, and a fixed roller driving structure.

One end of the fixed roller bracket 22 is provided at the first side of the side plate 10, and the other end extends forward. One end of the fixed roller support 22 is provided with a fixed roller mounting groove 222 extending along the length direction of the fixed roller support 22, the fixed roller 23 is positioned in the fixed roller mounting groove 222, one end of the fixed roller 23, which is close to the side plate 10, is opposite to the side plate 10, one side inner wall of the fixed roller mounting groove 222, which is far away from the side plate 10, is provided with a fixed roller mounting hole, one end of the fixed roller 23, which is far away from the side plate 10, is rotatably arranged in the fixed roller mounting hole through a bearing and the like, for example, so that the fixed roller 23 is rotatably arranged on the first side of the side plate 10 through the fixed roller support 22. The fixed roller driving structure comprises a fixed roller motor 24 and a fixed roller synchronous belt module. The fixed roller motor 24 is disposed at an end of the fixed roller bracket 22 remote from the fixed roller mounting groove 222. The fixed roller synchronous belt module comprises a fixed roller driving wheel 252, a fixed roller driven wheel 253 and a fixed roller synchronous belt 254 sleeved on the peripheries of the fixed roller driving wheel 252 and the fixed roller driven wheel 253. The fixed roller driving wheel 252 is sleeved at the tail end of the motor shaft of the fixed roller motor 24. The fixed roller driven wheel 253 is sleeved on the outer periphery of one end of the fixed roller 23 close to the side plate 10. The fixed roller motor 24 is used for driving the fixed roller driving wheel 252 to rotate, and driven by the fixed roller driven wheel 253 and the fixed roller synchronous belt 254, the fixed roller 23 can be driven to rotate relative to the fixed roller bracket 22, and the fixed roller motor 24 can drive the fixed roller 23 to rotate through the fixed roller synchronous belt assembly.

The fixed roller driving structure can also be replaced by a motorized roller, and the fixed roller motorized roller comprises a roller and a motor integrated in the roller. The fixed roller motor 24 is connected with the fixed roller 23 by power, and other common connection modes such as flat belts, gears or direct connection by using a coupler can be adopted.

In other embodiments, the fixed roller driving structure only includes the fixed roller motor 24, and one end of the fixed roller 23 near the side plate 10 is connected to the end of the motor shaft of the fixed roller motor 24, and the fixed roller motor 24 is used for driving the fixed roller 23 to rotate.

The swing roller assembly 30 includes a swing structure provided at a first side of the side plate 10, a swing roller 35 rotatably provided on the swing structure, and a swing roller driving structure for driving the swing roller 35 to rotate. The oscillating roller 35 is arranged between the two fixed rollers 23 along the path of travel of the film. The swing roller 35 is disposed in parallel with the fixed roller 23.

The oscillating structure is used to change the position of the oscillating roller 35 relative to the fixed rollers 23 of the two fixed roller assemblies 20. Specifically, the swing structure includes a swing roller bracket 32, a rotating shaft 33, and two swing arms 34.

One end of the swing roller bracket 32 is provided at the first side of the side plate 10, and the other end extends forward. One side of the swing roller bracket 32, which is close to the two fixed roller assemblies 20, is provided with a rotating shaft mounting groove 322, one side inner wall of the rotating shaft mounting groove 322, which is close to the side plate 10, and one side inner wall of the rotating shaft mounting groove 322, which is far away from the side plate, are respectively provided with two rotating shaft mounting holes, a rotating shaft 33 is positioned in the rotating shaft mounting groove 222, and two ends of the rotating shaft 33 are respectively rotatably arranged in the two rotating shaft mounting holes through bearings and the like. The two swing arms 34 are arranged at intervals in the front-rear direction along the axis direction of the rotating shaft 33. One end of each of the two swing arms 34 is sleeved on the periphery of the rotating shaft 33, so that connection with the rotating shaft 33 is achieved, and a swing roller 35 is rotatably arranged between the other ends of the two swing arms 34. The swing roller 35 is positioned below the swing roller bracket 32 and the rotating shaft 33. Two swing arm mounting holes are respectively formed in one ends of the two swing arms 34, which are close to the swing roller 35, and two ends of the swing roller 35 are respectively rotatably arranged in the two swing arm mounting holes through bearings and the like. The swing roller driving structure comprises a swing roller motor 36 and a swing roller synchronous belt module. The swing roller motor 36 is located outside the two swing arms 34 and is disposed on one swing arm 34 away from the side plate 10, and the end of the motor shaft of the swing roller motor 36 passes through the through hole of the corresponding swing arm 34 and is located between the two swing arms 34. The swing roller synchronous belt module comprises a swing roller driving wheel 373, a swing roller driven wheel 372 and a swing roller synchronous belt 374 sleeved on the peripheries of the swing roller driving wheel 373 and the swing roller driven wheel 372. The swing roller driving wheel 373 is sleeved on the outer periphery of the tail end of the motor shaft of the swing roller motor 36. The swing roller driven wheel 372 is sleeved on the outer periphery of one end of the swing roller 35 far away from the side plate 10. The swing roller motor 36 is used for driving the swing roller driving wheel 373 to rotate, and driven by the swing roller driven wheel 372 and the swing roller synchronous belt 374, so that the swing roller 35 can be driven to rotate relative to the two swing arms 34, and the swing roller motor 36 can drive the swing roller 35 to rotate relative to the two swing arms 34 through the swing roller synchronous belt assembly.

In other embodiments, the swing roller driving structure only includes a swing roller motor 36, where the end of the motor shaft of the swing roller motor 36 passes through the through hole of the corresponding swing arm 34 and is connected to the end of the swing roller 35 away from the side plate 10, and the swing roller motor 36 is used to drive the swing roller 35 to rotate relative to the two swing arms 34.

The swing roller motor 36 is connected with the swing roller 35 by power, and other common connection modes such as flat belts, gears or direct connection by using a coupler can be adopted.

The cover of two swing arms 34 is established and is equipped with connecting plate 342 between the one end of pivot 33 periphery, is equipped with connecting rod 343 between two swing arms 34, and connecting rod 343 is located the below of pivot 33, and connecting plate 342, the connecting rod 343 that set up play the stabilization effect to two swing arms 34 to can improve pendulum roller 35 wobbling stationarity.

In other embodiments, the connecting plate 342 may be disposed parallel to the side plate 10, so that the weight of two sides of the swing roller 35 is balanced by changing the position of the connecting plate 342 in the left-right direction, and the balance of the swing roller 35 is destroyed by the tiny tension of the film, so that the two swing arms 34 are driven to swing, and after the sensor feeds back signals to other clamping rollers or unreeling mechanisms, the unreeling speed of the film can be adjusted.

Through the structure, in practical application, the diaphragm bypasses the fixed roller 23 positioned below, bypasses the swinging roller 35, bypasses the fixed roller 23 positioned above, supports the diaphragm through the fixed roller 23, drives the two swinging arms 34 to swing left and right around the axis of the rotating shaft 33 through the rotation of the rotating shaft 33, drives the swinging roller 35 to swing left and right through the left and right swinging of the two swinging arms 34 so as to change the position of the swinging roller 35 relative to the two fixed rollers 23, and the swinging roller motor 36 and the fixed roller motor 24 output constant torque in the process of adjusting the speed of the diaphragm, so that the diaphragm is not stretched in the tape moving process and is continuously provided. According to the utility model, the fixed roller 23 and the swing roller 35 can be respectively driven to rotate by the fixed roller driving structure and the swing roller driving structure, so that the fixed roller 23 and the swing roller 35 become driving rollers, and the film can be actively conveyed by the fixed roller 23 and the swing roller 35, and the film cannot be stretched or broken in the film tape moving process. The utility model can realize the film tape with the tension below 1N (ox), and is suitable for micro tension control of film tape with thinner thickness or poorer material strength and easy breakage, such as lithium foil, film and the like formed after calendaring.

In this embodiment, the side plate 10 has a through hole (the side plate 10 may be another part of the apparatus that can provide support for the roller) passing through the first side and the second side of the side plate 10, and one end of the rotating shaft 33 near the side plate 10 passes through the through hole of the side plate 10 and is located outside the second side of the side plate 10, and the sensor is connected to the sensor, which in this embodiment is a fan-shaped approach cam 42. The approaching cam 42 can be rotated synchronously with the rotation shaft 33. The second side of the side plate 10 is provided with a proximity switch 43 via a switch bracket 432, the proximity switch 43 being located on one side of the proximity cam 42, in this embodiment the proximity cam 42 and the proximity switch 43 being arranged at a left-right spacing. The detection end of the proximity switch 43 is opposed to the circumferential surface of the proximity cam 42. The proximity switch 43 is used for detecting the distance between the detection end and the circumferential surface of the proximity cam 42, so that the rotation angle of the rotating shaft 33 can be detected, and further, the swing amplitude of the swing roller 35 can be detected. By detecting the swing amplitude of the swing roller 35, the rotation speeds of the fixed roller motor 24 and the swing roller motor 36 can be controlled, and the rotation speeds of the fixed roller 23 and the swing roller 35 can be controlled, so that the tension of the membrane can be controlled accurately.

After the sensor detects the swing amplitude of the swing roller 35, the sensor feeds back a signal to other clamping rollers or unreeling mechanisms, so that the speed of the membrane can be adjusted.

The sensor can also be replaced by other sensors such as a potentiometer.

The swing amplitude of the swing roller 35 is regulated by adopting a low-friction air cylinder in the prior art, so that the tension of the diaphragm can be regulated. Since the cylinder shaft of the low friction cylinder has friction with the cylinder body during the movement, the friction force cannot be ignored when the low tension control is realized on the diaphragm, and therefore, the low friction cylinder is not suitable for the low tension control. In this embodiment, the self weight of the swing roller 35, the swing arm 34, etc. can be used for tension adjustment to overcome the defect of the low friction air cylinder, when tension changes due to fluctuation of the deck speed, the swing arm 34 deviates from the original balance position under the influence of the fluctuation of the tension, and new balance is realized under the self weight of the swing roller 35, etc. to control the tension again. In an alternative, the end of the rotating shaft 33 located outside the second side of the side plate 10 is connected with a weight bar 44, specifically, the weight bar 44 is located between the approaching cam 42 and the side plate 10, one end of the weight bar 44 is sleeved on the periphery of the end of the rotating shaft 33 located outside the second side of the side plate 10, and the other end is inclined upwards in a direction away from the approaching switch 43, that is, the weight bar 44 is inclined upwards and forms an acute angle with the horizontal line, and the angle of the acute angle is 0-60 degrees, for example. The weight bar 44 is detachably provided with a weight 45, and the position of the weight 45 in the length direction of the weight bar 44 is adjustable. In the initial state, the swing roller 35 is kept at a set position under the action of the dead weight and the gravity of the balancing weight 45, and tension control of the membrane is realized through the gravity of the swing roller 35 and the balancing weight 45. By adjusting the position of the weight 45 in the length direction of the weight bar 44, the stable value of the tension of the diaphragm can be adjusted by changing the balance position of the swing roller 35. The tension of the diaphragm is adjusted by the gravity of the swing roller 35 and the balancing weight 45, and friction is not generated as in the prior art, so that low tension control can be realized.

In this embodiment, the balancing weight 45 is preferably sleeved on the periphery of the balancing weight strip 44, the bottom end of the balancing weight 45 is provided with a notch 453 communicated with the bottom end of the balancing weight 45, two balancing weight mounting holes 452 are respectively formed in the inner walls of two sides of the notch 453, and the two balancing weight mounting holes 452 extend to one side, close to the side plate 10, of the balancing weight 45 and one side, far away from the side plate 10, of the balancing weight 45. The two counterweight mounting holes 452 are provided with fasteners such as bolts, etc., so that the counterweight 45 can be detachably arranged on the counterweight bar 44, and the counterweight 45 can be detached from the counterweight bar 44 by detaching the bolts, thereby facilitating the adjustment of the position of the counterweight 45 in the length direction of the counterweight bar 44.

Referring to fig. 4, in an alternative solution, a second side of the side plate 10 is provided with a rotation shaft driving structure, and one end of the rotation shaft 33 located outside the second side of the side plate 10 is connected to the rotation shaft driving structure, and the rotation shaft driving structure is used for driving the rotation shaft 33 to rotate, so that the swing roller 35 can be driven to swing by two swing arms 34. The rotating shaft 35 is driven to rotate through the rotating shaft driving structure, so that the swing amplitude of the swing roller 35 can be adjusted, and the tension of the diaphragm can be adjusted.

The spindle drive structure includes a spindle motor 52 and a spindle timing belt module. The spindle motor 52 is disposed on a second side of the side plate 10. The rotating shaft synchronous belt module comprises a rotating shaft driving wheel 532, a rotating shaft driven wheel 533 and a rotating shaft synchronous belt 534 sleeved on the peripheries of the rotating shaft driving wheel 532 and the rotating shaft driven wheel 533. The rotating shaft driving wheel 532 is sleeved on the outer periphery of the tail end of the motor shaft of the rotating shaft motor 52, and the rotating shaft driving wheel 532 is positioned between the approaching cam 42 and the side plate 10. The rotation shaft driven wheel 533 is fitted around one end of the rotation shaft 33 located outside the second side of the side plate 10. The spindle motor 52 is used for driving the spindle driving wheel 532 to rotate, and under the action of the spindle driven wheel 533 and the spindle synchronous belt 534, the spindle 33 can be driven to rotate. The spindle motor 52 operates in a constant torque mode so as to provide a constant tension to the diaphragm. The swinging amplitude of the swinging roller 35 is detected through the proximity switch 43, so that the unreeling speed of the diaphragm is regulated under the condition of constant tension of the diaphragm, and the speed of the diaphragm is regulated. The constant tension control of the diaphragm is realized by adopting the rotating shaft motor 52 and the rotating shaft synchronous belt module, and the friction condition is avoided as in the prior art, so that the low tension control can be realized.

In another alternative, the tension of the diaphragm may be controlled by the weight of the pendulum roller 35 without providing the weight bar 44 and the weight 45 under minimal tension control.

In this embodiment, the fixed roller 23 and the swing roller 35 are carbon fiber rollers, so that the tensile force between the fixed roller 23, the swing roller 35 and the membrane caused by friction resistance caused by other factors such as bearings can be further reduced, and the tension of the membrane can be further and accurately controlled. The fixed roller 23 and the swinging roller 35 can also be aluminum rollers, and it is understood that the fixed roller 23 and the swinging roller 35 can also be made of other thin-wall light materials.

The bearings of the embodiment are all low-friction bearings, and the low-friction bearings are preferably ceramic ball bearings, so that the tension of the diaphragm can be further and accurately controlled. It will be appreciated that the bearing may also be other types of low friction bearings.

The utility model also provides calendaring equipment which comprises the tension control mechanism, and by adopting the tension control mechanism, the tension of the film can be accurately controlled.

While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and the equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. The utility model provides a tension control mechanism, its characterized in that includes curb plate, two decide roller subassembly and pendulum roller subassembly, two decide roller subassembly all including rotationally set up decide the roller of the first side of curb plate and be used for the drive decide roller pivoted decides roller drive structure, pendulum roller subassembly including set up in swing structure, rotationally set up in on the swing structure pendulum roller and be used for the drive pendulum roller pivoted pendulum roller drive structure, pendulum roller sets up along the tape path of diaphragm between the fixed roller of two decide roller subassembly, swing structure is used for changing pendulum roller is relative the position of two decides roller subassembly's fixed roller.

2. The tension control mechanism of claim 1, wherein the two fixed roller assemblies each comprise a fixed roller support arranged on a first side of the side plate, one end of the fixed roller support is provided with a fixed roller mounting groove extending along the length direction of the fixed roller support, the fixed roller is positioned in the fixed roller mounting groove, one end of the fixed roller, which is close to the side plate, is opposite to the side plate, one side inner wall of the fixed roller mounting groove, which is far away from the side plate, is provided with a fixed roller mounting hole, one end of the fixed roller, which is far away from the side plate, is rotatably arranged in the fixed roller mounting hole through a bearing, the fixed roller driving structure comprises a fixed roller motor, and the fixed roller motor is arranged on the fixed roller support and is used for driving the fixed roller to rotate.

3. The tension control mechanism according to claim 1, wherein the swing structure includes a rotation shaft rotatably provided at a first side of the side plate and two swing arms provided at intervals along an axial direction of the rotation shaft, one ends of the two swing arms are respectively connected with the rotation shaft, the other ends of the two swing arms are respectively provided with two swing arm mounting holes, both ends of the swing roller are rotatably provided in the two swing arm mounting holes through bearings, respectively, and the swing roller is located below the rotation shaft.

4. A tension control mechanism as recited in claim 3 wherein the swing roller drive structure comprises a swing roller motor disposed on one of the swing arms, the swing roller motor for driving the swing roller in rotation.

5. A tension control mechanism as recited in claim 3 wherein one end of the shaft passes through the through hole of the side plate and is located outside the second side of the side plate, and is connected with an approaching cam, the approaching cam can rotate synchronously with the shaft, the second side of the side plate is provided with a sensor, the sensor is located at one side of the approaching cam, and the detecting end of the sensor is opposite to the circumferential surface of the approaching cam, and the sensor is used for detecting the distance between the detecting end and the circumferential surface of the approaching cam, so that the rotation angle of the shaft can be detected, and the swing amplitude of the swing roller can be detected.

6. A tension control mechanism as recited in claim 3 wherein one end of the shaft passes through the through hole of the side plate and is located outside the second side of the side plate, and is connected with a weight bar, the weight bar being disposed obliquely upward, a weight being detachably provided on the weight bar, and the position of the weight in the length direction of the weight bar being adjustable.

7. A tension control mechanism as recited in claim 3 wherein the second side of the side plate is provided with a spindle drive structure, one end of the spindle passing through the through hole of the side plate and being located outside the second side of the side plate and being connected to the spindle drive structure, the spindle drive structure being adapted to drive the spindle to rotate so as to oscillate the oscillating roller through the two oscillating arms.

8. The tension control mechanism of claim 1, wherein the fixed roller and the swinging roller are carbon fiber rollers or aluminum rollers.

9. A tension control mechanism as claimed in claim 2 or claim 3 wherein the bearing is a low friction bearing and the low friction bearing is a ceramic ball bearing.

10. A calendaring apparatus comprising a tension control mechanism according to any of claims 1-9.