Rotary expansion device, coiler and application

Abstract

The application discloses a rotary expansion and contraction device, a coiler and application, and belongs to the technical field of coilers. The rotary expansion and contraction device comprises an expansion and contraction hydraulic cylinder, a rotating part and a connecting part. The connecting part comprises a first flange connected with a cylinder body of the expansion and contraction hydraulic cylinder, a second flange fixed with a reducer box body and a connecting body connecting the first flange and the second flange. The connecting body is hollow and conical in shape. The first flange is located on the side of a small end face of the connecting body, and the second flange is located on the side of a large end face of the connecting body. The rotating part comprises a bearing seat connected with a piston rod of the expansion and contraction hydraulic cylinder and a thrust bearing arranged in the bearing seat. The inner ring of the thrust bearing is connected with a pull rod. The bearing seat can reciprocate along an axis inside the connecting body. The connecting part can provide a relatively closed space for the rotating part, effectively preventing a large amount of dust existing in the use environment from entering the rotating part. The piston rod of the expansion and contraction hydraulic cylinder is not exposed to the dust, and the friction force is avoided from being increased.

Description

Technical Field

[0001] This invention belongs to the field of coiling machine technology, and more specifically, relates to a rotary expansion and contraction device, a coiling machine and its application, wherein the application includes a cold rolling production line and a hot rolling production line, preferably a cold rolling production line. Background Technology

[0002] The cold-rolled coiler is a key piece of equipment in the cold-rolled strip steel production line. Its function is to coil the cold-rolled steel strip into a cylindrical shape for later storage and transportation. As a critical component of the coiler, the coil directly affects the coiler's service life and coiling quality. Currently, most coils on the market employ an expansion and contraction structure with four or three sector plates expanding and contracting simultaneously. The expansion and contraction power is provided by a rotary expansion and contraction hydraulic cylinder. Because the hydraulic cylinder rotates with the coil, high-pressure hydraulic oil needs to be supplied to the hydraulic cylinder through a rotary joint. Both the coil structure and the rotary joint structure are relatively complex, resulting in high manufacturing costs.

[0003] To address the aforementioned issues, a search revealed that the currently employed methods include the following structures:

[0004] 1) Setting up a transition device: For example, Chinese patent CN220739063U discloses an expansion and contraction mechanism for a winding machine drum, wherein the push-pull device of the mechanism includes a moving flange, a fixed flange, a key unit, and multiple compression units; the moving flange and the fixed flange are both sleeved on a hollow shaft, and the two are connected laterally by multiple compression units evenly distributed along the circumference. The key unit is connected to the moving flange, the hollow shaft, and the pull rod. The expansion and contraction of the drum is achieved by the combination of a hydraulic cylinder and a push-pull device. Therefore, the hydraulic cylinder does not need to rotate and there is no need to configure a rotary joint.

[0005] 2) Installing transmission bearings on both sides of the main shaft of the drum: For example, Chinese patent CN218395371U discloses a rotary drum device in which a fixed hydraulic cylinder replaces a rotary hydraulic cylinder. The pushing and pulling force of the fixed hydraulic cylinder is transmitted to the head of the tie rod through a tie rod coupling. The thrust bearing at the head of the tie rod then transmits the pushing and pulling force to the rotating spindle inside the main shaft. At the same time, due to the isolation provided by the thrust bearing, the rotational force of the main shaft is not transmitted to the tie rod, thus achieving the purpose of replacing the rotary hydraulic cylinder. However, the thrust bearing is located on the other side of the main shaft (relative to the hydraulic cylinder). This structure results in greater vibration, which cannot meet the requirements for some existing high-precision winding thin strips.

[0006] For example, Chinese patent CN220667993U discloses a rotary expansion cylinder. It has a left fixed sleeve, a right fixed sleeve, and a bidirectional thrust ball bearing on the outside of the tie rod, and a through cover, a right cylinder cover, a cylinder barrel, a left cylinder cover, and a piston on the outside of the flange piston rod. This rotary expansion cylinder can eliminate the rotary joint while maintaining the original function of the expansion cylinder, and the structure is relatively simple. However, its flange piston rod is exposed on the outside. As is well known, the operating environment of the drum is relatively harsh, with a large number of dust particles in the environment. The dust particles adhere to the surface of the flange piston rod, which increases the friction of the piston movement and is not conducive to the expansion and contraction of the drum. Summary of the Invention

[0007] 1. The problem to be solved

[0008] To address the technical problem of increased friction caused by flange piston rods exposed to dust in existing technologies, this invention provides a rotary expansion and contraction device that can at least prevent dust from the operating environment from entering the rotating components, ensuring smooth expansion and contraction of the drum.

[0009] Another object of the present invention is to provide a winding machine having the above-described rotary expansion and contraction device.

[0010] Another object of the present invention is to provide an application in a rolling production line having the above-mentioned coiler, including but not limited to cold rolling production lines and hot rolling production lines, preferably cold rolling production lines, which have less impact on the coil compared to hot rolling production lines, and therefore have a relatively smaller impact on the expansion and contraction hydraulic cylinder.

[0011] 2. Technical Solution

[0012] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0013] The first aspect of the present invention provides a rotary expansion and contraction device, including an expansion and contraction hydraulic cylinder, a rotating component, and a connecting component;

[0014] The connecting component includes: a first flange connected to the cylinder body of the expansion and contraction hydraulic cylinder, a second flange fixed to the reducer housing, and a connecting body connecting the first flange and the second flange. The connecting body is hollow and conical. The first flange is located on the small end face side of the connecting body, and the second flange is located on the large end face side of the connecting body.

[0015] The rotating component includes: a bearing housing connected to the piston rod of the expansion and contraction hydraulic cylinder and a thrust bearing placed within the bearing housing, wherein the inner ring of the thrust bearing is connected to the pull rod; the bearing housing is capable of reciprocating along an axis within the connecting body.

[0016] The aforementioned connecting components can fix the expansion and contraction hydraulic cylinder on the one hand, and provide a relatively enclosed space for the rotating components on the other hand, effectively preventing a large amount of dust in the operating environment from entering the rotating components. The piston rod of the expansion and contraction hydraulic cylinder is not exposed to dust, avoiding increased friction. In addition, dust is prevented from entering the thrust bearing, thereby reducing the failure of the thrust bearing caused by wear.

[0017] According to any embodiment of the first aspect of the present invention, the outer surface of the bearing housing contacts and slides relative to the hollow inner wall of the connecting body, and the connecting body can support the bearing housing in the longitudinal direction, thereby reducing the runout amplitude of the bearing housing.

[0018] According to any embodiment of the first aspect of the present invention, the connecting body is provided with an oil cup and an oil inlet hole, and the outer side of the bearing seat is provided with an oil passage that matches the oil inlet hole. Under the lubrication of dry oil, the outer side of the bearing seat reduces the friction with the inner wall of the connecting body.

[0019] According to any embodiment of the first aspect of the present invention, a connecting rib is provided on the outer circumference of the connector, the connecting rib being distributed parallel to the axial direction of the connector. The connecting rib not only enhances the structural strength of the connector, but also forms a first heat dissipation channel to dissipate the heat generated inside the hollow interior of the connector in a timely manner, ensuring that the dried oil does not lose water and harden prematurely.

[0020] According to any embodiment of the first aspect of the present invention, the bearing housing includes a first housing body and a second housing body, the first housing body and the second housing body being fixed together by bolts, wherein the outer side of the first housing body contacts the hollow inner wall of the connecting body.

[0021] According to any embodiment of the first aspect of the present invention, a plurality of fastening holes are provided on the connector between the connecting stiffeners, the fastening holes corresponding to the positions of the bolts, and a breathable membrane is laid above the fastening holes. The fastening holes, the hollow cavity of the connector, and the second seat form a second heat dissipation channel, which effectively reduces the problems of thermal expansion and accelerated aging of the hydraulic rod seal ring of the expansion and contraction hydraulic cylinder, etc. The breathable membrane can reduce dust entering the hollow area of ​​the connector.

[0022] According to any embodiment of the first aspect of the present invention, a gasket is provided between the second flange and the reducer housing. The gasket can effectively reduce the vibration of the reducer transmitted to the connecting body and reduce the movement error of the expansion and contraction hydraulic cylinder.

[0023] According to any embodiment of the first aspect of the invention, the pull rod is fixed to the inner ring of the thrust bearing by an end cap and screws.

[0024] A second aspect of the present invention provides a winding machine, including a winding drum, a transmission device, and a rotary expansion and contraction device. The winding drum includes a main shaft, a fixed sector plate, an expansion and contraction sector plate, a radial wedge, an axial wedge, a drive disc, a pull rod, a nut, a pin, and a positioning block. The pull rod is disposed in the inner hole of the main shaft and slides within the inner hole. The fixed sector plate is mounted on the outer surface of the main shaft, and the fixed sector plate has pin holes. The expansion and contraction sector plate is connected to the fixed sector plate via a pin, and the expansion and contraction sector plate can rotate around the pin. The expansion and contraction sector plate is provided with a plurality of compression springs, which are fixed to the fixed sector plate by screws. When the expansion and contraction sector plate expands, the compression springs are compressed. The radial wedge has symmetrical inclined surfaces that fit into the sector plate; the lower inclined surface fits into the inclined surface of the axial wedge, and the axial wedge is installed in a groove on the fixed sector plate and can move left and right within the groove. The axial wedge is connected to the drive disc, which is fixed to the pull rod by a nut and a key, and moves and rotates with the pull rod. The transmission device includes a reducer housing and a transmission-side bearing placed in the housing. The rotary expansion and contraction device includes an expansion and contraction hydraulic cylinder, a rotating component, and a connecting component.

[0025] The connecting component includes: a first flange connected to the cylinder body of the expansion and contraction hydraulic cylinder, a second flange fixed to the reducer housing, and a connecting body connecting the first flange and the second flange. The connecting body is hollow and conical. The first flange is located on the small end face side of the connecting body, and the second flange is located on the large end face side of the connecting body.

[0026] The rotating component includes: a bearing housing connected to the piston rod of the expansion and contraction hydraulic cylinder and a thrust bearing placed within the bearing housing, wherein the inner ring of the thrust bearing is connected to the tie rod; the bearing housing is capable of reciprocating along an axis within the connecting body.

[0027] The rotating component serves as a transmission transition, so the expansion and contraction hydraulic cylinder does not need to rotate when the drum is rotating.

[0028] The third aspect of the present invention provides an application of the coiler described in the second aspect in a cold rolling production line, including but not limited to cold rolling production lines and hot rolling production lines, preferably cold rolling production lines. Compared with hot rolling production lines, cold rolling production lines have less impact on the coil, and therefore have a relatively smaller impact on the expansion and contraction hydraulic cylinder.

[0029] 3. Beneficial effects

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] (1) The rotary expansion and contraction device of the present invention plays a role in transmission transition through the setting of the rotary component. When the drum is rotating, the expansion and contraction hydraulic cylinder does not need to rotate, which solves the problem of oil leakage due to damage of the expansion and contraction hydraulic cylinder. At the same time, the connecting component can provide a relatively closed space for the rotary component, effectively preventing a large amount of dust in the working environment from entering the rotary component. The piston rod of the expansion and contraction hydraulic cylinder is not exposed to dust, avoiding increased friction; and preventing dust from entering the thrust bearing, thereby reducing the failure of the thrust bearing caused by wear.

[0032] (2) The rotary expansion and contraction device of the present invention, through the oil cup and the oil inlet hole, can make the contact surface between the outer side of the bearing seat and the hollow inner wall of the connecting body filled with lubricating dry oil, thereby realizing lubricating friction;

[0033] (3) In the rotary expansion and contraction device of the present invention, a breathable membrane is laid above the fastening hole, wherein the fastening hole, the hollow cavity of the connector and the second seat form a second heat dissipation channel, which effectively reduces the problem of thermal expansion and accelerated aging of the hydraulic rod seal ring of the expansion and contraction hydraulic cylinder. Attached Figure Description

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0035] Figure 1 This is a schematic diagram of the winding machine of the present invention;

[0036] Figure 2 This is a schematic diagram of the connection structure between the rotary expansion and contraction device and the transmission device of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the roll of the present invention;

[0038] Figure 4 This is a cross-sectional view of one side of the roll of the present invention;

[0039] Figure 5 This is a cross-sectional view of the other side of the reel of the present invention;

[0040] Figure 6 This is a schematic diagram of the rotating component structure of the rotary expansion and contraction device of the present invention;

[0041] Figure 7 This is a schematic diagram of a connecting component structure of the rotary expansion and contraction device of the present invention;

[0042] Figure 8 This is a schematic diagram of the assembly structure of the connecting component and the rotating component of the rotary expansion and contraction device of the present invention;

[0043] Figure 9 for Figure 8 Enlarged view of part A;

[0044] Figure 10 This is a schematic diagram of another connecting component structure of the rotary expansion and contraction device of the present invention;

[0045] Explanation of reference numerals in the attached figures:

[0046] 100. Drum; 101. Main shaft; 102. Fixed sector plate; 103. Expanding sector plate; 104. Radial wedge; 105. Axial wedge; 106. Drive disc; 107. Tie rod; 108. Nut; 109. Pin; 110. Positioning block; 111. Compression spring;

[0047] 200. Transmission device; 201. Gearbox housing; 202. Transmission side bearing; 203. Washer;

[0048] 300. Rotary expansion and contraction device; 310. Expansion and contraction hydraulic cylinder; 311. Piston rod; 320. Rotating component; 321. Bearing seat; 3211. First seat body; 3212. Second seat body; 3213. Bolt; 322. Thrust bearing; 323. End cap; 330. Connecting component; 331. First flange; 332. Second flange; 333. Connecting body; 334. Oil cup; 335. Oil inlet; 336. Oil passage; 337. Connecting rib; 338. Fastening hole; 339. Breathable membrane. Detailed Implementation

[0049] The following detailed description of exemplary embodiments of the invention is taken with reference to the accompanying drawings, which form part of the description and illustrate exemplary embodiments in which the invention may be practiced. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be implemented and various changes may be made to the invention without departing from the spirit and scope thereof. The more detailed description of embodiments of the invention below is not intended to limit the scope of the claimed invention, but is merely illustrative and not restrictive of the description of the features and characteristics of the invention, to suggest the best mode for carrying out the invention, and is sufficient to enable those skilled in the art to practice the invention. Therefore, the scope of the invention is defined only by the appended claims.

[0050] The following detailed description and exemplary embodiments of the invention can be better understood in conjunction with the accompanying drawings, wherein the elements and features of the invention are identified by reference numerals.

[0051] like Figures 1 to 10As shown, the cold rolling coiler of the present invention includes a coil 100, a transmission device 200, and a rotary expansion and contraction device 300. Compared with the hot rolling production line, the cold rolling (at room temperature) production line has less impact on the coil 100, and therefore the impact on the expansion and contraction hydraulic cylinder 310 is relatively small. The rotating component 320 serves as a transmission transition mechanism, so the expansion and contraction hydraulic cylinder 310 does not need to rotate when the coil 100 is rotating.

[0052] Among them, combined Figure 3 , Figure 4 and Figure 5 As shown, the drum 100 includes a main shaft 101, a fixed sector plate 102, an expanding and contracting sector plate 103, a radial wedge 104, an axial wedge 105, a drive disc 106, a pull rod 107, a nut 108, a pin 109, and a positioning block 110. The pull rod 107 is disposed in the inner hole of the main shaft 101 and slides in cooperation with the inner hole. The fixed sector plate 102 is mounted on the outer surface of the main shaft 101. The fixed sector plate 102 is provided with a pin hole. The expanding and contracting sector plate 103 is connected to the fixed sector plate 102 through the pin 109, and the expanding and contracting sector plate 103 can rotate around the pin 109. The expanding and contracting sector plate 103 is provided with a plurality of compression springs 111, which are fixed to the fixed sector plate 102 by screws. When the expanding and contracting sector plate 103 expands, the compression springs 111 are compressed.

[0053] In this embodiment, the radial wedge 104 is provided with a symmetrical inclined surface, the angle of which is generally 7°. The symmetrical inclined surface is in contact with the expansion and contraction sector plate 103. The lower inclined surface is in contact with the inclined surface of the axial wedge 105. The axial wedge 105 is installed in the groove on the fixed sector plate 102 and can move left and right along the groove. The axial wedge 105 is connected to the drive disk 106. At the same time, the drive disk 106 is fixed to the pull rod 107 by the nut 108 and moves together with the pull rod 107.

[0054] Furthermore, such as Figure 2 As shown, the transmission device 200 includes a reducer housing 201 and a transmission side bearing 202 and a gear placed in the housing. The transmission side bearing 202 is installed in the reducer bearing housing. The main shaft 101 and the transmission side bearing 202 are connected by an interference fit. The gear is connected to the main shaft by a flat key, thereby driving the main shaft 101 to drive the transmission side bearing 202 and the pull rod 107 to rotate.

[0055] like Figure 1 and Figure 2 As shown, the rotary expansion and contraction device 300 includes an expansion and contraction hydraulic cylinder 310, a rotating component 320, and a connecting component 330; combined with Figure 7The diagram illustrates the structure of a connector. The connecting component 330 includes: a first flange 331 connected to the cylinder body of the expansion and contraction hydraulic cylinder 310 (with screw and nut fitting), a second flange 332 fixed to the reducer housing 201 (with screw and nut fitting), and a connecting body 333 connecting the first flange 331 and the second flange 332. The connecting body 333 is a hollow conical cylinder. The first flange 331 is located on the small end face side (upper end face of the cone) of the connecting body 333, and the second flange 332 is located on the large end face side (lower end face of the cone) of the connecting body 333. This design results in a small footprint and low manufacturing cost.

[0056] The first flange 331, the second flange 332, and the connecting body 333 mentioned above are made of one piece, which has high structural strength and is safe and reliable to use.

[0057] Furthermore, such as Figure 6 As shown, the rotating component 320 includes a bearing seat 321 connected to the piston rod 311 of the expansion and contraction hydraulic cylinder 310 and a thrust bearing 322 (thrust ball bearing) placed inside the bearing seat 321. The inner ring of the thrust bearing 322 is connected to the pull rod 107. Specifically, the pull rod 107 and the inner ring of the thrust bearing 322 are fixed by an end cap 323 and screws. Under the pushing action of the expansion and contraction hydraulic cylinder 310, the bearing seat 321 can reciprocate along the axis inside the connecting body 333.

[0058] It should be noted that in the rotary expansion cylinder disclosed in CN220667993U, the flange piston rod is exposed on the outside, and dust particles adhere to the surface of the flange piston rod, increasing the friction of piston movement. In contrast, the connecting body 333 of the present invention can fix the expansion cylinder 310 on the one hand, and provide a relatively enclosed space for the rotating component 320 on the other hand, effectively preventing a large amount of dust in the operating environment from entering the rotating component 320. The piston rod 311 of the expansion cylinder 310 is not exposed to dust, avoiding increased friction. In addition, it prevents dust from entering the thrust bearing 322, thereby reducing the failure of the thrust bearing 322 due to wear.

[0059] Combination Figure 8 As shown, the outer surface of the bearing housing 321 contacts and slides relative to the hollow inner wall of the connecting body 333. The connecting body 333 can support the bearing housing 321 in the longitudinal direction, reducing the runout of the bearing housing 321. Feedback from field use test data shows that:

[0060]

[0061] Based on the above structure, in order to reduce the friction between the outer surface of the bearing housing 321 and the inner wall of the connecting body 333, the connecting body 333 is provided with an oil cup 334 and an oil inlet hole 335. The outer surface of the bearing housing 321 has an oil passage 336 that matches the oil inlet hole 335. Under the lubrication of dry oil, the outer surface of the bearing housing 321, through the oil cup 334 and the oil inlet hole 335, can be filled with lubricating dry oil, achieving lubricated friction.

[0062] like Figure 7 and Figure 10 As shown, connecting ribs 337 are provided on the outer circumference of the connector 333. These connecting ribs 337 are distributed parallel to the axial direction of the connector 333. The connecting ribs 337 and the connector 333 can be integrally formed. The connecting ribs 337 not only enhance the structural strength of the connector 333 but also form a primary heat dissipation channel, promptly dissipating the heat generated inside the hollow interior of the connector 333 and preventing the drying oil from hardening prematurely. From the top view, the connecting ribs 337 are symmetrically arranged on both sides of the connector 333, playing a role in balancing the connector 333 to a certain extent.

[0063] In this embodiment, as Figure 6 As shown, the bearing housing 321 adopts a split structure, which includes a first housing 3211 and a second housing 3212. The first housing 3211 and the second housing 3212 are fixed by bolts 3213. The outer side of the first housing 3211 contacts the hollow inner wall of the connecting body 333, which facilitates the installation of the pull rod 107 and the end cover 323.

[0064] Since the first seat 3211 and the second seat 3212 are fixed by bolts 3213, therefore, the combination Figure 8 , Figure 9 and Figure 10 A plurality of fastening holes 338 are provided on the connecting body 333 between the connecting stiffeners 337. The fastening holes 338 correspond to the positions of the bolts 3213 (the positions where the piston is in the retracted state). A breathable membrane 339 is laid on top of the fastening holes 338. The specific material of the breathable membrane 339 is TPU waterproof and breathable membrane, PE waterproof and breathable membrane, PP waterproof and breathable membrane or e-PTFE waterproof and breathable membrane. The fastening holes 338, the hollow cavity of the connecting body 333 and the second seat 3212 form a second heat dissipation channel, which effectively reduces the problem of thermal expansion and accelerated aging of the hydraulic rod seal ring of the expansion and contraction hydraulic cylinder 310.

[0065] Furthermore, extensive use has surprisingly revealed that when the drum 100 rotates at high speed, the pull rod 107 and the thrust bearing 322 rotate together, creating a localized micro-negative pressure space inside the connector 333 (the measured micro-negative pressure value is about 10 Pa). This accelerates the entry of dust particles (nanoscale) into the interface between the bearing seat 321 and the connector 333, as well as into the thrust bearing 322. The venting membrane installed on the fastening hole 338 effectively reduces the amount of dust entering the hollow area of ​​the connector 333 without hindering heat dissipation. At the same time, the venting membrane is easy to remove, thus facilitating the operation of the bolt 3213.

[0066]

[0067] Note: The values ​​were measured under constant room temperature conditions.

[0068] Furthermore, such as Figure 2 As shown, a gasket 203 is provided between the second flange 332 and the reducer housing 201. The gasket 203 is made of fluororubber. The gasket 203 effectively reduces the vibration of the reducer transmitted to the connecting body 333, reduces the vibration error of the expansion and contraction hydraulic cylinder 310, and provides high precision for winding thin strips.

[0069] The advantages of this invention are: 1) The expansion and contraction hydraulic cylinder 310 does not need to rotate, so there is no need to configure a rotary joint, which reduces production costs; 2) The expansion and contraction hydraulic cylinder 310 is subjected to force in only one direction, is not easily damaged, and will not pollute the environment due to hydraulic oil leakage.

[0070] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A rotary expansion and contraction device (300), comprising an expansion and contraction hydraulic cylinder (310), characterized in that, It also includes a rotating component (320) and a connecting component (330); The connecting component (330) includes: a first flange (331) connected to the cylinder body of the expansion and contraction hydraulic cylinder (310), a second flange (332) fixed to the reducer housing (201), and a connecting body (333) connecting the first flange (331) and the second flange (332). The connecting body (333) is hollow conical in shape. The first flange (331) is located on the small end face side of the connecting body (333), and the second flange (332) is located on the large end face side of the connecting body (333). The rotating component (320) includes: a bearing housing (321) connected to the piston rod of the expansion and contraction hydraulic cylinder (310) and a thrust bearing (322) placed in the bearing housing (321), the inner ring of the thrust bearing (322) being connected to the pull rod (107); the bearing housing (321) is capable of reciprocating along an axis inside the connecting body (333); The outer circumference of the connector (333) is provided with connecting stiffeners (337), which are distributed parallel to the axial direction of the connector (333). A plurality of fastening holes (338) are provided on the connector (333) between the connecting stiffeners (337). The fastening holes (338) correspond to the positions of the bolts (3213). A breathable membrane (339) is laid on the top of the fastening holes (338). The fastening holes (338), the hollow cavity of the connector (333), and the second seat (3212) form a second heat dissipation channel.

2. The rotary expansion and contraction device (300) according to claim 1, characterized in that, The outer side of the bearing housing (321) contacts and slides relative to the hollow inner wall of the connector (333).

3. The rotary expansion and contraction device (300) according to claim 2, characterized in that, The connector (333) is provided with an oil cup (334) and an oil inlet (335), and the outer side of the bearing seat (321) is provided with an oil passage (336) that matches the oil inlet (335).

4. The rotary expansion and contraction device (300) according to claim 3, characterized in that, The breathable membrane (339) is made of TPU waterproof and breathable membrane, PE waterproof and breathable membrane, PP waterproof and breathable membrane or e-PTFE waterproof and breathable membrane.

5. The rotary expansion and contraction device (300) according to claim 4, characterized in that, The bearing housing (321) includes a first housing body (3211) and a second housing body (3212), the first housing body (3211) and the second housing body (3212) are fixed by bolts (3213), wherein the outer side of the first housing body (3211) is in contact with the hollow inner wall of the connecting body (333).

6. The rotary expansion and contraction device (300) according to claim 5, characterized in that, The first flange (331), the second flange (332), and the connector (333) are manufactured as a single piece.

7. The rotary expansion and contraction device (300) according to claim 6, characterized in that, A gasket (203) is provided between the second flange (332) and the gearbox housing (201).

8. The rotary expansion and contraction device (300) according to claim 7, characterized in that, The pull rod (107) is fixed to the inner ring of the thrust bearing (322) by an end cap (323) and screws.

9. A winding machine, comprising a winding drum (100), a transmission device (200), and a rotary expansion and contraction device; said transmission device (200) comprising a reducer housing (201) and a transmission-side bearing (202) disposed within the housing; characterized in that, The rotary expansion and contraction device is the rotary expansion and contraction device (300) according to any one of claims 1-8.

10. The application of the coiler of claim 9 in a cold rolling production line.

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