阅读说明：本技术 一种胎圈钢丝收线张紧装置 (Tire bead steel wire take-up and tensioning device ) 是由 窦勇 王金武 窦万明 杨俊和 窦衍君 王松 管玉红 窦燕霞 于 2021-11-16 设计创作，主要内容包括：一种胎圈钢丝收线张紧装置,属于钢丝收线辅助设备领域,包括底座和收线装置,收线装置由电机、齿轮组和纵向的固定螺杆组成,底座的顶面一侧固定安装有第一安装板,电机固定安装于第一安装板的前面,固定螺杆的前部贯穿第一安装板并与之转动连接。与现有装置相比,首先,本装置将下压辊与下转轴分开设置,在电机运行初期,下压辊与下转轴均处于加速状态,下压辊和上压辊的加速力由钢丝牵引提供,而下转轴和上转轴的加速力由电机通过联动装置提供,减少了钢丝所受到的牵引力,其次,本装置中,阻力组件设置于下转轴与下压辊之间,本装置通过下转轴的转动带动阻力组件进行转动,减少了阻力组件与接触面之间的相对位移,进而降低了阻力组件的磨损。(The utility model provides a take-up overspeed device tensioner is received to tire bead steel wire, belongs to the wire and receives line auxiliary assembly field, including base and take-up, and take-up comprises motor, gear train and fore-and-aft clamping screw, and top surface one side fixed mounting of base has first mounting panel, and motor fixed mounting is in the front of first mounting panel, and clamping screw's front portion runs through first mounting panel and rotates with it and is connected. Compared with the prior art, at first, this device will push down the roller and separately set up with the lower pivot, at the motor operation initial stage, the lower pressure roller all is in acceleration state with lower pivot, the accelerating force of lower pressure roller and last compression roller is provided by the steel wire traction, and the accelerating force of lower pivot and last pivot is provided through aggregate unit by the motor, the traction force that the steel wire received has been reduced, secondly, in this device, the resistance subassembly sets up under between pivot and the lower pressure roller, this device drives the resistance subassembly through the rotation of pivot down and rotates, the relative displacement between resistance subassembly and the contact surface has been reduced, and then the wearing and tearing of resistance subassembly have been reduced.)

1. The utility model provides a take-up overspeed device tensioner is received to tire bead steel wire, including base (101) and take-up, take-up is by motor (301), the gear train constitutes with fore-and-aft clamping screw (302), top surface one side fixed mounting of base (101) has first mounting panel (102), motor (301) fixed mounting is in the front of first mounting panel (102), the front portion of clamping screw (302) runs through first mounting panel (102) and rotates with it and is connected, motor (301) output shaft passes through the gear train and drives clamping screw (302) and rotate, the top surface opposite side fixed mounting of base (101) has second mounting panel (103), fixed mounting has resistance device on second mounting panel (103), a serial communication port: the resistance device comprises an upper rotating shaft (201) and an upper press roller (202), lower pivot (203), lower compression roller (204) and resistance assembly, go up compression roller (202) and install in the periphery of last pivot (201) through one-way bearing, lower compression roller (204) are installed in the periphery of pivot (203) down through one-way bearing, the front portion of pivot (203) runs through second mounting panel (103) down and is connected with second mounting panel (103) rotation, resistance assembly sets up in the rear end of pivot (203) down, resistance assembly can have angular velocity difference and produce the dynamic friction resistance because of lower compression roller (204) and lower pivot (203), be provided with aggregate unit on first mounting panel (102), motor (301) can drive pivot (201) and pivot (203) down through aggregate unit and rotate, be provided with adjusting device on first mounting panel (102), adjusting device can drive pivot (201) and remove.

2. A bead wire take-up tensioner as claimed in claim 1, wherein: the linkage device comprises a reversing gear (401), two groups of chain wheel and chain structures and a movable plate (402), wherein the front part of a fixed screw (302) penetrates through one side of the rear part of the movable plate (402) and is rotationally connected with the movable plate (402), the front part of an upper rotating shaft (201) penetrates through the other side of the rear part of the movable plate (402) and is rotationally connected with the movable plate (402), the reversing gear (401) is rotationally installed in front of a first installation plate (102), the rotating direction of the reversing gear (401) is opposite to that of the fixed screw (302), one group of chain wheel and chain structures are arranged between the front end of the upper rotating shaft (201) and the front end of the fixed screw (302), and the other group of chain wheel and chain structures are arranged between the reversing gear (401) and a lower rotating shaft (203).

3. A bead wire take-up tensioner as claimed in claim 2, wherein: the adjusting device comprises an electric push rod (501) and a mounting block (502), the mounting block (502) is fixedly mounted in front of the first mounting plate (102), one end of the electric push rod (501) is hinged to the mounting block (502), and the other end of the electric push rod (501) is hinged to the top surface of the movable plate (402).

4. A bead wire take-up tensioner as claimed in claim 1, wherein: the resistance assembly comprises a movable ring (601), a friction ring (602), a first limiting structure, a movable plate (603), a support cap (604), a constant force device and a displacement device, wherein the movable ring (601) is arranged at the rear part of the periphery of a lower rotating shaft (203), the friction ring (602) is fixedly arranged in front of the movable ring (601), the front of the friction ring (602) is attached to the rear of a lower pressing roller (204), the first limiting structure is arranged between the peripheries of the movable ring (601) and the lower rotating shaft (203), the movable plate (603) is positioned behind the lower rotating shaft (203), the movable plate (603) is arranged on the top surface of a base (101) through the displacement device, the displacement device can drive the movable plate (603) to move back and forth, the support cap (604) is rotatably arranged in front of the movable plate (603), the rear end of the lower rotating shaft (203) can be inserted into the support cap (604), the constant force device is arranged on the movable plate (603), the constant force device can give a forward and constant force to the movable ring (601).

5. A bead wire take-up tensioner as claimed in claim 4, wherein: the constant force device consists of a through groove (701), a longitudinal rack (702), a second limiting structure, a connecting gear (703), a wire wheel (704), a lifting plate (705), a pull rope (706), a third limiting structure and a clamping cap (707), wherein the through groove (701) is arranged in front of the moving plate (603), the rack (702) penetrates through the through groove (701) and the tooth surface of the rack (702) faces downwards, the second limiting structure is arranged between the top surface of the rack (702) and the top surface of the inner wall of the through groove (701), the connecting gear (703) is rotatably arranged in the through groove (701), the connecting gear (703) is meshed with the rack (702), the wire wheel (704) and the connecting gear (703) are coaxially arranged, the lifting plate (603) is arranged in front of the moving plate (603) through the third limiting structure, one end of the pull rope (706) is fixedly connected with the periphery of the wire wheel (704) and winds around the wire wheel (704) for several circles, and the other end of the pull rope (706) is connected with the lifting plate (705) and can drive the lifting plate (704) to move up and down, a clamping cap (707) is mounted on the rear surface of the movable ring (601) through a bearing, and the front end of the rack (702) is clamped with the clamping cap (707).

6. A bead wire take-up tensioner as claimed in claim 4, wherein: the displacement device comprises a positioning plate (801), a longitudinal displacement screw (802) and a fourth limiting structure, wherein the positioning plate (801) is located behind the moving plate (603), the bottom surface of the positioning plate (801) is fixedly connected with the base (101), the rear portion of the displacement screw (802) penetrates through the positioning plate (801) and is rotatably connected with the positioning plate, the displacement screw (802) penetrates through the moving plate (603) and is in threaded fit with the moving plate, and the fourth limiting structure is arranged between the bottom surface of the moving plate (603) and the top surface of the base (101).

Technical Field

The invention belongs to the field of auxiliary steel wire take-up equipment, and particularly relates to a tire bead steel wire take-up tensioning device.

Background

The manufacturing process of the tire bead steel wire is characterized in that a wire rod purchased from a steel mill is drawn into a steel wire with the diameter meeting the requirement through a wire drawing machine and then is wound by the winding machine, a tension device is needed to provide back tension for the steel wire in the winding process of the winding machine, otherwise the steel wire cannot be tightly wound on a winding drum of the winding machine, and the condition of collapsing can occur, the existing tension device enables the steel wire to penetrate between two clamping rollers, a contact friction piece is added on the clamping rollers, so that the steel wire can be subjected to resistance when driving the clamping rollers to rotate, the effect of providing tension for the steel wire is realized, the steel wire can be rubbed with the friction piece when a connecting shaft rotates, the friction piece is seriously worn, secondly, the winding device can accelerate the rotation of the clamping rollers through the steel wire in the initial stage of winding, and in the process, the steel wire needs to bear the traction force required by driving the clamping rollers to accelerate the rotation, the steel wire is easy to be damaged.

Disclosure of Invention

The invention provides a tire bead steel wire take-up and tensioning device which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

a tire bead steel wire take-up tensioning device comprises a base and a take-up device, the take-up device is composed of a motor, a gear set and a longitudinal fixing screw, a first mounting plate is fixedly mounted on one side of the top surface of the base, the motor is fixedly mounted in front of the first mounting plate, the front portion of the fixing screw penetrates through the first mounting plate and is rotationally connected with the first mounting plate, a motor output shaft drives the fixing screw to rotate through the gear set, a second mounting plate is fixedly mounted on the other side of the top surface of the base, a resistance device is fixedly mounted on the second mounting plate and comprises an upper rotating shaft, an upper pressing roller, a lower rotating shaft, a lower pressing roller and a resistance assembly, the upper pressing roller is mounted on the periphery of the upper rotating shaft through a one-way bearing, the lower pressing roller is mounted on the periphery of the lower rotating shaft through a one-way bearing, the front portion of the lower rotating shaft penetrates through the second mounting plate and is rotationally connected with the second mounting plate, and the resistance assembly is arranged at the rear end of the lower rotating shaft, resistance subassembly can have the angular velocity difference to produce because of compression roller and lower pivot down and move frictional resistance, is provided with aggregate unit on the first mounting panel, and the motor can drive pivot and lower pivot through aggregate unit and rotate, is provided with adjusting device on the first mounting panel, and adjusting device can drive the pivot removal of going up.

The tire bead steel wire take-up and tensioning device comprises a reversing gear, two sets of chain wheel and chain structures and a movable plate, wherein the front part of a fixed screw penetrates through one side of the rear part of the movable plate and is rotatably connected with the movable plate, the front part of an upper rotating shaft penetrates through the other side of the rear part of the movable plate and is rotatably connected with the movable plate, the reversing gear is rotatably installed in front of a first installation plate, the rotating direction of the reversing gear is opposite to that of the fixed screw, one set of chain wheel and chain structure is arranged between the front end of the upper rotating shaft and the front end of the fixed screw, and the other set of chain wheel and chain structure is arranged between the reversing gear and a lower rotating shaft.

According to the tire bead wire take-up and tensioning device, the adjusting device comprises the electric push rod and the mounting block, the mounting block is fixedly mounted in front of the first mounting plate, one end of the electric push rod is hinged to the mounting block, and the other end of the electric push rod is hinged to the top surface of the movable plate.

The tire bead steel wire take-up and tensioning device comprises a resistance assembly, a movable ring, a friction ring, a first limiting structure, a movable plate, a supporting cap, a constant force device and a displacement device, wherein the movable ring is arranged at the rear part of the periphery of a lower rotating shaft, the friction ring is fixedly arranged in front of the movable ring, the front part of the friction ring is attached to the rear part of a lower pressing roller, the first limiting structure is arranged between the periphery of the movable ring and the periphery of the lower rotating shaft, the movable plate is positioned at the rear part of the lower rotating shaft, the movable plate is arranged on the top surface of a base through the displacement device, the displacement device can drive the movable plate to move back and forth, the supporting cap is rotatably arranged in front of the movable plate, the rear end of the lower rotating shaft can be inserted into the supporting cap, the constant force device is arranged on the movable plate, and the constant force device can give forward and constant force to the movable ring.

The constant force device comprises a through groove, a longitudinal rack, a second limiting structure, a connecting gear, a wire wheel, a lifting plate, a pull rope, a third limiting structure and a clamping cap, wherein the through groove is formed in the front of the movable plate, the rack penetrates through the through groove, the rack tooth surface faces downwards, the second limiting structure is arranged between the top surface of the rack and the top surface of the inner wall of the through groove, the connecting gear is rotatably arranged in the through groove, the connecting gear is meshed with the rack, the wire wheel is coaxially arranged with the connecting gear, the lifting plate is arranged in the front of the movable plate through the third limiting structure, one end of the pull rope is fixedly connected with the periphery of the wire wheel and wound in circles, the other end of the pull rope is connected with the lifting plate and can drive the lifting plate to move up and down, the clamping cap is arranged at the back of the movable ring through a bearing, and the front end of the rack is clamped with the clamping cap.

The tire bead wire take-up and tensioning device comprises a positioning plate, a longitudinal displacement screw and a fourth limiting structure, wherein the positioning plate is located behind a moving plate, the bottom surface of the positioning plate is fixedly connected with a base, the rear portion of the displacement screw penetrates through the positioning plate and is rotatably connected with the positioning plate, the displacement screw penetrates through the moving plate and is in threaded fit with the moving plate, and the fourth limiting structure is arranged between the bottom surface of the moving plate and the top surface of the base.

The invention has the advantages that: a user places a spool on a fixed screw rod, clamps and fixes the spool through two fixing nuts, controls an adjusting device to enable an upper rotating shaft to move upwards to separate an upper pressing roller from a lower pressing roller, enables a steel wire to pass through between the upper pressing roller and the lower pressing roller, fixes one end of the steel wire on the spool, enables the upper rotating shaft to move downwards through the adjusting device again, clamps the steel wire through the upper pressing roller and the lower pressing roller, and turns on a motor, an output shaft of the motor rotates to drive the fixed screw rod to rotate through a gear set, the fixed screw rod rotates to drive the spool to rotate, and the steel wire is wound on the spool, meanwhile, the motor rotates to drive the upper rotating shaft to rotate anticlockwise and the lower rotating shaft to rotate clockwise through a linkage device, and the upper pressing roller and the lower pressing roller can also rotate anticlockwise and clockwise due to the movement of the steel wire, and the angular velocities of the upper pressing roller and the lower pressing roller are both greater than the angular velocities of the upper rotating shaft and the lower rotating shaft, the angular velocity difference between the lower rotating shaft and the lower pressure roller enables the rear side of the lower pressure roller and the resistance component to generate relative displacement, dynamic friction force is generated between the resistance component and the lower pressure roller, the dynamic friction force can provide tension for the steel wire, so that the steel wire is tightly wound on the spool, compared with the prior device, firstly, the device separately arranges the lower compression roller and the lower rotating shaft, at the initial stage of the motor operation, the lower pressure roller and the lower rotating shaft are both in an accelerating state, the accelerating force of the lower pressure roller and the upper pressure roller is provided by the traction of a steel wire, the accelerating force of the lower rotating shaft and the upper rotating shaft is provided by the motor through the linkage device, the traction force on the steel wire is reduced, secondly, among this device, the resistance subassembly sets up under between pivot and the compression roller, and this device drives the resistance subassembly through the rotation of pivot down and rotates, has reduced the relative displacement between resistance subassembly and the contact surface, and then has reduced the wearing and tearing of resistance subassembly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention; fig. 2 is an enlarged view of the view from the direction a of fig. 1.

Reference numerals: 101. the device comprises a base, 102, a first mounting plate, 103, a second mounting plate, 201, an upper rotating shaft, 202, an upper pressing roller, 203, a lower rotating shaft, 204, a lower pressing roller, 301, a motor, 302, a fixed screw, 401, a reversing gear, 402, a movable plate, 501, an electric push rod, 502, a mounting block, 601, a movable ring, 602, a friction ring, 603, a movable plate, 604, a supporting cap, 701, a through groove, 702, a rack, 703, a connecting gear, 704, a reel, 705, a lifting plate, 706, a pull rope, 707, a clamping cap, 801, a positioning plate, 802 and a displacement screw.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A tire bead wire take-up tensioning device comprises a base 101 and a take-up device, wherein the take-up device comprises a motor 301, a gear set and a longitudinal fixing screw 302, two fixing nuts in threaded fit with the fixing screw 302 are arranged on the fixing screw 302, a user can adjust the positions of the fixing nuts or disassemble the fixing nuts by rotating the fixing nuts, the user places a spool on the fixing screw 302 and enables the spool to be positioned between the two fixing nuts, the user can adjust the two fixing nuts to clamp and fix the spool, a first mounting plate 102 is fixedly mounted on one side of the top surface of the base 101, the motor 301 is fixedly mounted in front of the first mounting plate 102, the front portion of the fixing screw 302 penetrates through the first mounting plate 102 and is rotatably connected with the first mounting plate 102, an output shaft of the motor 301 drives the fixing screw 302 to rotate through the gear set, a second mounting plate 103 is fixedly mounted on the other side of the top surface of the base 101, the resistance device is fixedly arranged on the second mounting plate 103 and comprises an upper rotating shaft 201, an upper pressing roller 202, a lower rotating shaft 203, a lower pressing roller 204 and a resistance component, the upper rotating shaft 201, the upper pressing roller 202, the lower rotating shaft 203 and the lower pressing roller 204 are all longitudinally arranged, the upper pressing roller 202 is arranged on the periphery of the upper rotating shaft 201 through a one-way bearing, the lower pressing roller 204 is arranged on the periphery of the lower rotating shaft 203 through a one-way bearing, the upper pressing roller 202 only can rotate anticlockwise relative to the upper rotating shaft 201, the lower pressing roller 204 only can rotate clockwise relative to the lower rotating shaft 203, the front part of the lower rotating shaft 203 penetrates through the second mounting plate 103 and is rotatably connected with the second mounting plate 103, the resistance component is arranged at the rear end of the lower rotating shaft 203 and can generate dynamic friction resistance due to the angular velocity difference between the lower pressing roller 204 and the lower rotating shaft 203, a linkage device is arranged on the first mounting plate 102, and the motor 301 can drive the upper rotating shaft 201 and the lower rotating shaft 203 to rotate through the linkage device, the radius of the upper press roll 202 is equal to that of the lower press roll 204, the ratio of the radius of the upper press roll 202 or the radius of the lower press roll 204 to the radius of the inner circle of the spool is smaller than the transmission ratio of the linkage device, the structure can enable the device to operate, the moving speed of the steel wire is equal to the linear speed of the upper press roll 202 and the lower press roll 204, the moving speed of the steel wire is larger than the linear speed of the inner circle of the spool, conversion of the inequalities can be achieved, the angular speed of the upper press roll 202 and the lower press roll 204 is larger than the angular speed of the upper rotating shaft 201 and the lower rotating shaft 203, the adjusting device is arranged on the first mounting plate 102, and the adjusting device can drive the upper rotating shaft 201 to move. A user places a spool on a fixed screw 302, the spool is clamped and fixed through two fixing nuts, an adjusting device is controlled to enable an upper rotating shaft 201 to move upwards, an upper pressing roller 202 is separated from a lower pressing roller 204, a steel wire penetrates through a space between the upper pressing roller 202 and the lower pressing roller 204, one end of the steel wire is fixed on the spool, the upper rotating shaft 201 moves downwards again through the adjusting device, the steel wire is clamped by the upper pressing roller 202 and the lower pressing roller 204, a motor 301 is started, an output shaft of the motor 301 rotates to drive the fixed screw 302 to rotate through a gear set, the fixed screw 302 rotates to drive the spool to rotate, and then the steel wire is wound on the spool, meanwhile, the motor 301 rotates to drive the upper rotating shaft 201 to rotate anticlockwise and a lower rotating shaft 203 to rotate clockwise through a linkage device, and the upper pressing roller 202 can rotate anticlockwise and the lower pressing roller 204 can rotate clockwise due to the movement of the steel wire, and the angular velocity of the upper press roll 202 and the lower press roll 204 is greater than the angular velocity of the upper rotating shaft 201 and the lower rotating shaft 203, the angular velocity difference between the lower rotating shaft 203 and the lower press roll 204 causes the relative displacement between the rear side of the lower press roll 204 and the resistance assembly, the resistance assembly and the lower press roll 204 generate the dynamic friction force, the dynamic friction force can provide the tension force for the steel wire, so that the steel wire is tightly wound on the I-shaped wheel, compared with the prior device, firstly, the device separates the lower press roll 204 from the lower rotating shaft 203, the lower press roll 204 and the lower rotating shaft 203 are in the accelerating state at the initial running stage of the motor 301, the accelerating force of the lower press roll 204 and the upper press roll 202 is provided by the steel wire traction, and the accelerating force of the lower rotating shaft 203 and the upper rotating shaft 201 is provided by the motor 301 through the linkage device, the traction force borne by the steel wire is reduced, secondly, in the device, the resistance assembly is arranged between the lower rotating shaft 203 and the lower press roll 204, this device drives the resistance subassembly through the rotation of pivot 203 down and rotates, has reduced the relative displacement between resistance subassembly and the contact surface, and then has reduced the wearing and tearing of resistance subassembly.

Specifically, as shown in fig. 1, the linkage device according to the present embodiment includes a reversing gear 401, two sets of sprocket chain structures, and a movable plate 402, wherein a front portion of a fixed screw 302 penetrates one side of a rear surface of the movable plate 402 and is rotatably connected to the movable plate 402, a front portion of an upper rotating shaft 201 penetrates the other side of the rear surface of the movable plate 402 and is rotatably connected to the movable plate 402, the reversing gear 401 is rotatably mounted in front of a first mounting plate 102, a rotating direction of the reversing gear 401 is opposite to a rotating direction of the fixed screw 302, the reversing gear 401 is engaged with a gear mounted on the fixed screw 302 in a gear set, one set of sprocket chain structures is disposed between a front end of the upper rotating shaft 201 and a front end of the fixed screw 302, the other set of sprocket chain structures is disposed between the reversing gear 401 and a lower rotating shaft 203, the sprocket chain structures can be replaced by sprocket chain transmission systems, and sprocket chain transmission systems are widely used in variable speed bicycles, for the prior art, this application does not have too much repeated description, and the user can adjust linkage's drive ratio according to the interior circle radius size of I-shaped wheel. When installing in the gear train and carrying out anticlockwise rotation in the gear of clamping screw 302, can drive through one of them group sprocket chain structure and go up pivot 201 and carry out anticlockwise rotation, here simultaneously, can drive switching-over gear 401 clockwise turning, pivot 203 clockwise turning under driving through another group sprocket chain structure, fly leaf 402 can use clamping screw 302's longitudinal center line to rotate as the centre of a circle in addition for go up the position change of pivot 201, this aggregate unit's simple structure, be convenient for carry out the manufacturing.

Specifically, as shown in fig. 1, the adjusting device according to this embodiment is an electric push rod 501 and a mounting block 502, the mounting block 502 is fixedly mounted in front of the first mounting plate 102, one end of the electric push rod 501 is hinged to the mounting block 502, and the other end of the electric push rod 501 is hinged to the top surface of the movable plate 402. The electric push rod 501 can extend and retract to drive the movable plate 402 to rotate by taking the longitudinal center line of the fixing screw 302 as a circle center, and further drive the upper rotating shaft 201 to move, so that the position of the upper rotating shaft 201 can be adjusted, and the adjusting device is simple in structure and convenient to produce and manufacture.

Further, as shown in fig. 2, the resistance assembly of this embodiment is composed of a movable ring 601, a friction ring 602, a first limiting structure, a movable plate 603, a supporting cap 604, a constant force device and a displacement device, wherein the movable ring 601 is disposed at the rear portion of the periphery of the lower rotating shaft 203, the friction ring 602 is fixedly mounted in front of the movable ring 601, the mounting manner is that the friction ring 602 is fixedly mounted by strong glue, the front of the friction ring 602 is attached to the rear portion of the lower pressing roller 204, the first limiting structure is disposed between the movable ring 601 and the periphery of the lower rotating shaft 203, the first limiting structure is composed of a first limiting groove and a first limiting block, the first limiting groove is disposed at the periphery of the lower rotating shaft 203, the rear side of the first limiting groove is communicated with the outside, the first limiting block is fixedly mounted on the inner wall of the movable ring 601, the first limiting block is disposed in the first limiting groove and can slide along the first limiting groove, the movable plate 603 is disposed at the rear portion of the lower rotating shaft 203, the movable plate 603 is mounted on the top surface of the base 101 through a displacement device, the displacement device can drive the movable plate 603 to move back and forth, the support cap 604 is rotatably mounted in front of the movable plate 603, a clamping groove is formed in one side of the support plate, the rear end of the lower rotating shaft 203 can be inserted into the support cap 604, the constant force device is arranged on the movable plate 603, and the constant force device can provide a forward constant force to the movable ring 601. When the device runs, the lower rotating shaft 203 rotates to drive the friction ring 602 to rotate through the first limiting structure and the movable ring 601, the angular velocity of the lower pressing roller 204 is greater than that of the lower rotating shaft 203, the angular velocity of the friction ring 602 is equal to that of the lower rotating shaft 203, relative displacement is generated due to the angular velocity difference between the lower pressing roller 204 and the friction ring 602, dynamic friction is generated between the lower pressing roller 204 and the friction ring 602, and then tension can be provided for a steel wire.

Furthermore, as shown in fig. 2, the constant force device according to this embodiment is composed of a through groove 701, a longitudinal rack 702, a second limiting structure, a connecting gear 703, a reel 704, a lifting plate 705, a pulling rope 706, a third limiting structure and a locking cap 707, the through groove 701 is opened in front of the moving plate 603, the rack 702 passes through the through groove 701 with the tooth surface of the rack 702 facing downward, the second limiting structure is disposed between the top surface of the rack 702 and the top surface of the inner wall of the through groove 701, the second limiting structure is composed of a second limiting groove and a second limiting block, the second limiting groove and the second limiting block are T-shaped sliding groove slider structures, the second limiting groove is opened on the top surface of the rack 702, the second limiting block is fixedly mounted on the top surface of the inner wall of the through groove 701, the second limiting block is located in the second limiting groove and can slide along the second limiting groove, the connecting gear 703 is rotatably mounted in the through groove 701, the connecting gear 703 is engaged with the rack 702, the reel 704 is coaxially mounted with the connecting gear 703, the lifting plate 705 is arranged in front of the moving plate 603 through a third limiting structure, the third limiting structure is composed of a third limiting groove and a third limiting block, the third limiting groove and the third limiting block are of T-shaped sliding groove sliding block structures, the third limiting groove is arranged in front of the moving plate 603, the third limiting block is fixedly arranged behind the lifting plate 705, the third limiting block is positioned in the third limiting groove and can slide along the third limiting groove, one end of a pull rope 706 is fixedly connected with the periphery of the wire wheel 704 and winds around the wire wheel 704 for a plurality of circles, the other end of the pull rope 706 is connected with the lifting plate 705 and can drive the lifting plate 705 to move up and down, the other end of the pull rope 706 is fixedly connected with the top surface of the third limiting block, the pull rope 706 is connected with the lifting plate 705 through the third limiting block, a clamping cap 707 is arranged behind the movable ring 601 through a bearing, the specific installation mode is that the inner ring of the bearing is fixedly connected with the rear surface of the movable ring 601, the clamping cap 707 is fixedly arranged on the outer ring of the bearing, the front end of the rack 702 is engaged with a snap cap 707. The user can place the balancing weight above the lifting plate 705, the sum of the gravity of the balancing weight, the lifting plate 705 and the third limiting block can give a forward force to the rack 702 through the pull rope 706, the wire wheel 704 and the connecting gear 703, the rack 702 can transmit the force to the movable ring 601 through the clamping cap 707, so that the movable ring 601 receives a forward force, the force is a constant force, the force is equal to the sum of the gravity of the balancing weight, the lifting plate 705 and the third limiting block minus the sum of the frictional resistance of each component in the constant force device, compared with the spring structure in the prior art, the device can give a forward constant force to the movable ring 601, after the position of the movable ring 601 is changed, the expansion amount of the spring is changed, the force given to the movable ring 601 is also changed, and further, the dynamic friction force between the friction ring 602 and the lower pressure roller 204 is changed, thereby affecting the tension of the steel wire.

Furthermore, as shown in fig. 2, the displacement device described in this embodiment is composed of a positioning plate 801, a longitudinal displacement screw 802 and a fourth limiting structure, the positioning plate 801 is located behind the moving plate 603, the bottom surface of the positioning plate 801 is fixedly connected with the base 101, the rear portion of the displacement screw 802 penetrates through the positioning plate 801 and is rotatably connected with the positioning plate, the rear end of the displacement screw 802 is fixedly provided with a rotating handle, the displacement screw 802 penetrates through the moving plate 603 and is in threaded fit with the moving plate, the fourth limiting structure is disposed between the bottom surface of the moving plate 603 and the top surface of the base 101, the fourth limiting structure is composed of a fourth limiting groove and a fourth limiting block, the fourth limiting groove is disposed on the top surface of the base 101, the fourth limiting block is fixedly mounted on the bottom surface of the moving plate 603, and the fourth limiting block is located in the fourth limiting groove and can slide along the fourth limiting groove. The user rotates the displacement screw 802 through the rotating handle, the displacement screw 802 rotates to drive the moving plate 603 in threaded fit with the displacement screw to move back and forth, and the fourth limiting structure can play a role in guiding and positioning.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.