A segmented transmission device for rollers in a whole-section box-type spinning frame

Abstract

This invention specifically relates to a segmented transmission device for the middle roller of a whole-section box-type spinning frame. The device is mounted on the frame, which includes a middle wall plate. A horizontal circular beam is connected to the top of the middle wall plate. The horizontal circular beam is assembled from several short circular beams. The segmented transmission device for the middle roller is located in the middle of the horizontal circular beam. The segmented transmission device includes a motor mounting base, a servo motor, a planetary reducer, a gearbox, and two couplings. The servo motor is located on one side of the motor mounting base and has a rated output torque of 6.2 Nm. The planetary reducer increases the output torque of the servo motor by 10:1, and the gearbox increases the output torque of the planetary reducer by 4.1 times. The two couplings are located at both ends of the gearbox output shaft. The total output torque of the entire segmented transmission device for the middle roller is 254.2 Nm. This invention can shorten the length-to-diameter ratio of the middle roller transmission and avoid the occurrence of torsional vibration of the middle roller.

Description

Technical Field

[0001] This invention belongs to the field of ring spinning machine technology, specifically relating to a roller segmented transmission device in a whole-section box-type ring spinning machine. Background Technology

[0002] As market demand for extra-long spinning frames gradually increases, spinning frames are becoming longer, leading to longer center rollers. Increasing the length of the center roller increases the length-to-diameter ratio of the center roller drive. A larger roller drive length-to-diameter ratio can cause torsional vibration of the center roller, which is a phenomenon where the torsion transmitted by the drafting drive at the head and tail of the spinning frame lags at the end of each center roller. The problem of roller torsional vibration caused by the large length-to-diameter ratio of the center roller drive is becoming increasingly prominent, thus affecting the quality of the yarn. Traditional extra-long spinning frames reduce the length-to-diameter ratio of the roller drive by setting up an intermediate drive housing to avoid roller torsional vibration. However, the intermediate drive housing is expensive to produce, and its large size occupies the original spindle space of the spinning frame, resulting in a reduction in the number of spindles and thus a decrease in the output of the spinning frame. Summary of the Invention

[0003] This invention provides a segmented transmission device for the middle roller of a whole-section box-type spinning frame, which can shorten the length-to-diameter ratio of the middle roller transmission and avoid the occurrence of torsional vibration of the middle roller.

[0004] The technical solution of this invention is as follows: A roller segmented transmission device for a whole-section box-type spinning frame, mounted on the frame of the spinning frame, the frame including several middle wall plates, the tops of the several middle wall plates being connected to a horizontal circular beam, the horizontal circular beam having two sets, each set of the horizontal circular beam being assembled by splicing several short circular beams end to end, the horizontal circular beam having several roller seats, the two sides of the roller seats being two roller zones of the spinning frame, each roller zone including a front roller, a middle roller and a rear roller arranged at 45°; the middle of the horizontal circular beam is symmetrically provided with a middle roller segmented transmission device, each middle roller segmented transmission device including:

[0005] The motor mounting base is installed on two short circular beams in the middle of two sets of horizontal circular beams, and the motor mounting base has a through hole in the middle.

[0006] A servo motor is located on one side of the motor mounting base, and the rated output torque of the servo motor is 6.2 Nm;

[0007] A planetary reducer is connected to the output end of a servo motor, and the planetary reducer and the servo motor are located on the same side of the motor mounting base. The planetary reducer is connected to the output end of the servo motor to reduce the speed of the servo motor. The reduction ratio of the planetary reducer is 1:10. The planetary reducer increases the output torque of the servo motor by 10:1. The output shaft of the planetary reducer extends to the through hole of the motor mounting base.

[0008] The gearbox includes a sealed housing and a reduction gear assembly. The gearbox is located on the other side of the motor mounting base via the sealed housing. The reduction gear assembly is housed inside the sealed housing. The input shaft of the reduction gear assembly is located at the through hole of the motor mounting base. The input shaft of the reduction gear assembly is connected to the output shaft of the planetary reducer. Both ends of the output shaft of the reduction gear assembly extend to the outside of the sealed housing. The transmission ratio of the reduction gear assembly is 4.1. The gearbox increases the output torque of the planetary reducer by a factor of 4.1 through the reduction gear assembly inside it.

[0009] There are two couplings, and the two couplings are respectively located at both ends of the output shaft of the gearbox;

[0010] The output torque of the entire middle roller segmented transmission device is 254.2 Nm; each side of the spinning frame includes a first middle roller and a second middle roller, which are connected to the two ends of the output shaft of the reduction assembly via couplings.

[0011] Furthermore, the bottom end of the motor mounting base is symmetrically provided with mounting plates. Each mounting plate is connected to the bottom of the motor mounting base by bolts. Each mounting plate and the bottom of the motor mounting base form a mounting hole. The motor mounting base is installed on the two short circular beams in the middle of the two sets of horizontal circular beams through the two mounting holes on its bottom.

[0012] Furthermore, the motor mounting base is provided with multiple first connecting holes, which are evenly arranged around the through hole in the middle of the motor mounting base. The sealing housing of the gearbox is provided with multiple second connecting holes, and the sealing housing is installed on the motor mounting base by screws, the second connecting holes and the first connecting holes.

[0013] Furthermore, the reduction assembly is formed by the sequential meshing of an input gear, a first double-row gear, a second double-row gear, a transmission gear, and an output gear; the gear shaft of the input gear is the input shaft of the reduction assembly; the first double-row gear includes a first large gear and a first small gear, the first large gear meshes with the input gear; the second double-row gear includes a second large gear and a second small gear, the second large gear meshes with the first small gear, the second small gear meshes with the transmission gear, the transmission gear meshes with the output gear, and the gear shaft of the output gear is the output shaft of the reduction assembly.

[0014] Furthermore, the planetary reducer and the gearbox are connected at the through hole of the motor mounting base. One end of the planetary reducer with an output shaft is connected to the sealed housing of the gearbox by screws. The output shaft of the planetary reducer is provided with a connecting key, and the input shaft of the reduction assembly is provided with a keyway. The output shaft of the planetary reducer and the input shaft of the reduction assembly are connected by a connecting key and a keyway key.

[0015] Furthermore, each of the couplings is provided with two sensor mounting plates on one side, and each sensor mounting plate is provided with a detection hole. Hall sensors for detecting the rotational speed of the first and second rollers are respectively installed at the two detection holes.

[0016] Furthermore, the first middle roller is a roller on the same side as the motor, that is, the first middle roller and the servo motor are located on the same side of the motor mounting base; the second middle roller is a roller on the opposite side of the motor, which is located on the opposite side of the motor mounting base as well as the servo motor. The second middle roller includes a second middle roller head and a second middle roller body. The second middle roller head and the second middle roller body are threaded together to form an integral unit. The second middle roller head is connected to one end of the output shaft of the reduction assembly through a coupling.

[0017] The beneficial effects of this invention are as follows: the initial torque provided by the servo motor is amplified by 10 times through the planetary reducer, and the torque amplified by the planetary reducer is amplified by 4.1 times through the reduction gearbox. Under the premise that the extra-long carriage of the spinning frame can operate normally, the two ends of the output shaft of the reduction assembly are connected to the first and second middle rollers respectively through two couplings, which shortens the transmission length of each middle roller section, thereby avoiding torsional vibration of each middle roller section and avoiding affecting the yarn quality. At the same time, the servo motor, planetary reducer and reduction gearbox are mounted on the horizontal circular beam of the spinning frame through the motor mounting bracket, which simplifies the volume of the intermediate transmission box in the prior art, reduces the spindle space it occupies on the spinning frame, and improves the production efficiency of the spinning frame. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the working state of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 3 This is an exploded view of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the motor mounting base in this invention;

[0023] Figure 5 This is a schematic diagram of the gearbox structure in this invention;

[0024] Figure 6 This is a schematic diagram of the deceleration component in this invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "middle," "upper," "lower," "one side," "one end," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Existing technology uses drafting transmission boxes at the head, middle, and tail of the spinning frame to provide torque to the center roller in extra-long spinning frames. The intermediate transmission box shortens the length of each center roller segment, thus preventing torsional vibration. However, the intermediate transmission box has a complex internal structure, high production cost, and a large volume, which occupies space in the spinning frame's original spindles, reducing the number of spindles and consequently lowering the spinning frame's output. Therefore, the inventors of this application provide a segmented center roller transmission device for a whole-section box-type spinning frame. This device shortens the length-to-diameter ratio of the center roller transmission, prevents torsional vibration, improves yarn quality, and the compact transmission structure reduces wasted space on empty spindles, improving the economic efficiency of the spinning frame.

[0028] like Figure 1-6 As shown, a roller segmented transmission device for a whole-section box-type spinning frame is installed on the frame 1 of the spinning frame. The frame 1 includes several middle wall plates 11, and the tops of the several middle wall plates 11 are connected to a horizontal circular beam 12. There are two sets of horizontal circular beams 12. Each set of horizontal circular beams 12 is assembled by splicing several short circular beams end to end. Several roller seats 13 are provided on the horizontal circular beams 12. The two sides of the roller seats 13 are the two roller areas of the spinning frame. Each roller area includes a front roller 14, a middle roller 15 and a rear roller 16 arranged at 45°. The middle roller segmented transmission device is symmetrically provided in the middle of the horizontal circular beams 12. Each middle roller segmented transmission device includes: a motor mounting base 2, a servo motor 3, a planetary reducer 4, a gearbox 5 and a coupling 6.

[0029] The output torque of the entire middle roller segmented transmission device is 254.2 Nm; each middle roller 15 on each side of the spinning machine includes a first middle roller 15-1 and a second middle roller 15-2. The first middle roller 15-1 and the second middle roller 15-2 are respectively connected to the two ends of the output shaft of the reduction assembly 52 in the reduction gearbox 5 through the coupling 6.

[0030] Based on the above embodiments, the speed of the servo motor 3 is reduced by the planetary reducer 4 and the gearbox 5, and the output torque of the servo motor 3 is increased; the middle roller segment transmission device set between the first middle roller 15-1 and the second middle roller 15-2 performs drafting transmission on the two middle rollers 15, shortening the length-to-diameter ratio of the middle roller transmission, avoiding the occurrence of torsional vibration of the middle roller, and thus avoiding the impact on the yarn quality.

[0031] In this invention, the motor mounting base 2 is installed on two short circular machine beams in the middle of two sets of horizontal circular machine beams 12, and the motor mounting base 2 is provided with a through hole 21 in the middle.

[0032] Among them, such as Figure 4As shown, the bottom end of the motor mounting base 2 is symmetrically provided with mounting plates 22. Each mounting plate 22 is connected to the bottom of the motor mounting base 2 by bolts. Each mounting plate 22 and the bottom of the motor mounting base 2 form a mounting hole 23. The motor mounting base 2 is installed on the two short circular beams in the middle of the two sets of horizontal circular beams 12 through the two mounting holes 23 on its bottom.

[0033] Based on the above embodiment, the motor mounting base 2 is placed above the horizontal circular machine beam 12. By setting the mounting plate 22 at the bottom of the motor mounting base 2, a mounting hole 23 that can be adapted to the horizontal circular machine beam 12 is formed, ensuring that the motor mounting base 2 can be stably installed on the two short circular machine beams in the middle of the two sets of horizontal circular machine beams 12, so that the motor mounting base 2 becomes the mounting base of the entire middle roller segmented transmission device.

[0034] In this invention, the servo motor 3 is located on one side of the motor mounting base, and the rated output torque of the servo motor 3 is 6.2 Nm.

[0035] The planetary reducer 4 is connected to the output end of the servo motor 3, and the planetary reducer 4 and the servo motor 3 are located on the same side of the motor mounting base 2. The planetary reducer 4 is connected to the output end of the servo motor 3 to reduce the speed of the servo motor 3. The reduction ratio of the planetary reducer 4 is 1:10. The planetary reducer 4 increases the output torque of the servo motor 3 by 10:1. The output shaft of the planetary reducer 4 extends to the through hole 21 of the motor mounting base 2.

[0036] Based on the above embodiments, the planetary reducer 4 is a commonly used device in the prior art.

[0037] In this invention, such as Figure 3 , Figure 5 as well as Figure 6 As shown, the gearbox 5 includes a sealed housing 51 and a reduction assembly 52. ​​The gearbox 5 is located on the other side of the motor mounting base 2 through the sealed housing 51. The reduction assembly 52 is provided inside the sealed housing 51. The input shaft of the reduction assembly 52 is located at the through hole 21 of the motor mounting base 2. The input shaft of the reduction assembly 52 is connected to the output shaft of the planetary reducer 4. Both ends of the output shaft of the reduction assembly 52 extend to the outside of the sealed housing 51. The transmission ratio of the reduction assembly 52 is 4.1. The gearbox 5 increases the output torque of the planetary reducer 4 by 4.1 times through the reduction assembly 52 inside it.

[0038] Among them, such as Figure 6As shown, the reduction assembly 52 is formed by the sequential meshing of an input gear 53, a first double-row gear 54, a second double-row gear 55, a transmission gear 56, and an output gear 57. The gear shaft of the input gear 53 is the input shaft of the reduction assembly 52. ​​The first double-row gear 54 includes a first large gear 54-1 and a first small gear 54-2. The first large gear 54-1 meshes with the input gear 53. The second double-row gear 55 includes a second large gear 55-1 and a second small gear 55-2. The second large gear 55-1 meshes with the first small gear 54-1, and the second small gear 55-2 meshes with the transmission gear 56. The transmission gear 56 meshes with the output gear 57. The gear shaft of the output gear 57 is the output shaft of the reduction assembly 52.

[0039] Specifically, the motor mounting base 2 has multiple first connecting holes 24, which are evenly distributed around the through hole 21 in the middle of the motor mounting base 2. The sealed housing 51 of the gearbox 5 has multiple second connecting holes 51-1. The sealed housing 51 is mounted on the motor mounting base 2 by screws, the second connecting holes 51-1, and the first connecting holes 24. The planetary reducer 4 is connected to the gearbox 5 at the through hole 21 of the motor mounting base 2. One end of the planetary reducer 4 with an output shaft is connected to the sealed housing 51 of the gearbox 5 by screws. The output shaft of the planetary reducer 4 is provided with a connecting key, and the input shaft of the reduction assembly 52 is provided with a keyway. The output shaft of the planetary reducer 4 and the input shaft of the reduction assembly 52 are connected by a connecting key and a keyway key.

[0040] Based on the above embodiments, the sealed housing 51 of the gearbox 5 is installed on one side of the motor mounting base 2, and the planetary reducer 4 is connected to the gearbox 5 and set on the other side of the motor mounting base 2. The output torque of the servo motor is increased by the planetary reducer 4 and then output, and the torque output by the planetary reducer 4 is increased by the reduction assembly 52.

[0041] In this invention, there are two couplings 6, and the two couplings 6 are respectively located at both ends of the output shaft of the gearbox 5.

[0042] Each coupling 6 has two sensor mounting plates on one side, and each sensor mounting plate has a detection hole. Hall sensors for detecting the rotational speed of the first middle roller 15-1 and the second middle roller 15-2 are respectively installed at the two detection holes.

[0043] Specifically, the first middle roller 15-1 is the same side roller as the motor, that is, the first middle roller 15-1 and the servo motor 3 are located on the same side of the motor mounting base 2; the second middle roller 15-2 is the opposite side roller of the motor, which is located on the opposite side of the motor mounting base 2 as the servo motor 3, and the second middle roller 15-2 includes a second middle roller head and a second middle roller body. The second middle roller head and the second middle roller body are threaded together to form an integral unit. The second middle roller head is connected to one end of the output shaft of the reduction assembly 52 through the coupling 6.

[0044] Based on the above embodiment, the first middle roller 15-1 and the second middle roller 15-2 are respectively connected to the two ends of the output shaft of the reduction assembly 52 via the coupling 6, ensuring that the servo motor 3 can drive the first middle roller 15-1 and the second middle roller 15-2 to rotate after being reduced in speed by the planetary reducer 4 and the reduction gearbox 5; the rotational speeds of the two first middle rollers 15-1 and the two second middle rollers 15-2 are detected by four Hall sensors on both sides of the spinning machine, ensuring that the rotational speeds of all section middle rollers on both sides of the spinning machine are the same; the Hall sensors are commonly used devices in the prior art, and there is no specific limitation on them, and the Hall sensors are not shown in the figure.

[0045] When the middle roller segmented transmission device provided by the present invention provides torque to the middle roller, the motor mounting base 2 is placed above the two short original machine beams in the middle of the two sets of horizontal circular machine beams 12, and the two mounting plates 22 are respectively set below the two short circular machine beams. The two mounting plates are connected to the bottom of the motor mounting base 2 by bolts. At this time, each mounting plate 22 and the motor mounting base 2 form a mounting hole 23 that can cooperate with the horizontal circular machine beam 12. The motor mounting base 2 is stably installed on the two short original machine beams in the middle of the two sets of horizontal circular machine beams 12.

[0046] The gearbox 5 is screwed to one side of the motor mounting base 2 by connecting the second connecting hole 51-1 on the sealed housing 51 of the gearbox 5 and the first connecting hole 24 on the motor mounting base 2. Then, the input shaft of the gearbox 5's reduction assembly 52 is keyed to the output shaft of the planetary reducer 4, so that the planetary reducer 4 is installed on the other side of the motor mounting base 2, and the servo motor 3 is connected to the input shaft of the planetary reducer 4. The two ends of the output shaft of the gearbox 5's reduction assembly 52 are respectively connected to the two middle rollers on one side of the spinning machine through the coupling 6. When the spinning machine is working, the two middle rollers on each side rotate at the same speed and run together, which shortens the length of the middle roller in each transmission section, thereby eliminating the torsional vibration of each middle roller and avoiding the impact on the quality of the yarn.

[0047] The two middle rollers on the other side of the spinning frame are connected to another middle roller segmented transmission device. The two middle roller segmented transmission devices on the same spinning frame are symmetrically arranged on its horizontal circular beam 12. This middle roller segmented transmission device reduces the volume of the intermediate transmission box in the prior art while eliminating the torsional vibration of each middle roller. It also reduces the space occupied by the spindle in the spinning frame, thereby increasing the output of the spinning frame compared with the prior art.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A roller segmented transmission device for a whole-section box-type spinning frame, mounted on the frame of the spinning frame, the frame including several middle wall plates, the tops of the middle wall plates being connected to a horizontal circular beam, the horizontal circular beam having two sets, each set of the horizontal circular beam being assembled by splicing several short circular beams end to end, the horizontal circular beam having several roller seats, the two sides of the roller seats being two roller zones of the spinning frame, each roller zone including a front roller, a middle roller, and a rear roller arranged at 45°; the middle of the horizontal circular beam is symmetrically provided with a middle roller segmented transmission device, characterized in that... Each middle roller segment transmission device includes: The motor mounting base is installed on two short circular beams in the middle of two sets of horizontal circular beams, and the motor mounting base has a through hole in the middle. A servo motor is located on one side of the motor mounting base, and the rated output torque of the servo motor is 6.2 Nm; A planetary reducer is connected to the output end of a servo motor, and the planetary reducer and the servo motor are located on the same side of the motor mounting base. The planetary reducer is connected to the output end of the servo motor to reduce the speed of the servo motor. The reduction ratio of the planetary reducer is 1:

10. The planetary reducer increases the output torque of the servo motor by 10:

1. The output shaft of the planetary reducer extends to the through hole of the motor mounting base. The gearbox includes a sealed housing and a reduction gear assembly. The gearbox is located on the other side of the motor mounting base via the sealed housing. The reduction gear assembly is housed inside the sealed housing. The input shaft of the reduction gear assembly is located at the through hole of the motor mounting base. The input shaft of the reduction gear assembly is connected to the output shaft of the planetary reducer. Both ends of the output shaft of the reduction gear assembly extend to the outside of the sealed housing. The transmission ratio of the reduction gear assembly is 4.

1. The gearbox increases the output torque of the planetary reducer by a factor of 4.1 through the reduction gear assembly inside it. There are two couplings, and the two couplings are respectively located at both ends of the output shaft of the gearbox; The output torque of the entire middle roller segmented transmission device is 254.2 Nm; each side of the spinning frame includes a first middle roller and a second middle roller, which are connected to the two ends of the output shaft of the reduction assembly via couplings.

2. The roller segment transmission device for a whole-section box-type spinning frame according to claim 1, characterized in that, The bottom end of the motor mounting base is symmetrically provided with mounting plates. Each mounting plate is connected to the bottom of the motor mounting base by bolts. Each mounting plate and the bottom of the motor mounting base form a mounting hole. The motor mounting base is installed on the two short circular beams in the middle of the two sets of horizontal circular beams through the two mounting holes on its bottom.

3. The roller segment transmission device in a whole-section box-type spinning frame according to claim 2, characterized in that, The motor mounting base is provided with multiple first connection holes, which are evenly arranged around the through hole in the middle of the motor mounting base. The sealing housing of the gearbox is provided with multiple second connection holes. The sealing housing is installed on the motor mounting base by screws, the second connection holes and the first connection holes.

4. The roller segment transmission device in a whole-section box-type spinning frame according to claim 3, characterized in that, The reduction gear assembly is composed of an input gear, a first double-row gear, a second double-row gear, a transmission gear, and an output gear meshing sequentially. The gear shaft of the input gear is the input shaft of the reduction gear assembly. The first double-row gear includes a first large gear and a first small gear, with the first large gear meshing with the input gear. The second double-row gear includes a second large gear and a second small gear, with the second large gear meshing with the first small gear. The second small gear meshes with the transmission gear, and the transmission gear meshes with the output gear. The gear shaft of the output gear is the output shaft of the reduction gear assembly.

5. The roller segmented transmission device in a whole-section box-type spinning frame according to claim 4, characterized in that, The planetary reducer and the gearbox are connected at the through hole of the motor mounting base. One end of the planetary reducer with an output shaft is connected to the sealed housing of the gearbox with screws. The output shaft of the planetary reducer is provided with a connecting key, and the input shaft of the reduction assembly is provided with a keyway. The output shaft of the planetary reducer and the input shaft of the reduction assembly are connected by a connecting key and a keyway key.

6. The roller segment transmission device in a whole-section box-type spinning frame according to claim 5, characterized in that, Each coupling has two sensor mounting plates on one side, and each sensor mounting plate has a detection hole. Hall sensors for detecting the rotational speed of the first and second rollers are respectively installed at the two detection holes.

7. The roller segmented transmission device in a whole-section box-type spinning frame according to claim 6, characterized in that, The first middle roller is the same side roller as the motor, that is, the first middle roller and the servo motor are located on the same side of the motor mounting base; the second middle roller is the opposite side roller of the motor, which is located on the opposite side of the motor mounting base as well as the servo motor. The second middle roller includes a second middle roller head and a second middle roller body. The second middle roller head and the second middle roller body are threaded together to form an integral unit. The second middle roller head is connected to one end of the output shaft of the reduction assembly through a coupling.

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