Four-roller cold rolling unit with adjustable gears

Abstract

The utility model relates to the technical field of rolling mills, and provides a gear-adjustable four-roller cold rolling unit which comprises a placing layer, a rolling mill main body is arranged on the upper portion of the placing layer, when rough rolling is needed, the rolling mill main body is set to be in a low-speed gear, and a blank loading and unwinding mechanism conveys workpieces into the rolling mill main body for machining. After machining is completed, the workpiece is conveyed to the welding platform on the other side again, the rolling mill steering roller, the thickness gauge, the metal plate spraying system, the outer cloth clamping mechanism, the hydraulic pipe position and the coiling mechanism are used for clamping, tightly supporting and liquid scraping on the workpiece, and the coiling mechanism on the other side is used for coiling and collecting the machined workpiece; and the coiling mechanism on one side is used for discharging, so that finish rolling can be carried out on the workpiece, and reversible rolling can be carried out according to different material rolling mill processes. By means of the technical scheme, the problems that in the prior art, gear adjusting machining is not convenient to conduct during workpiece machining, and the application range is not good enough are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling mills, and more specifically, to a four-roll cold rolling mill with adjustable gears. Background Art

[0002] A rolling mill is a device for realizing the metal rolling process, generally referring to the equipment for completing the whole process of rolled product production. Rolling mills can be divided into two-roll, four-roll, six-roll, eight-roll, twelve-roll, eighteen-roll, etc. according to the number of rolls. A rolling mill mainly consists of rolls, a frame, a roll gap adjusting device, a roll temperature adjusting device, a transmission device, a lubrication system, a control system, a roll removing device, etc. In addition to the main components and devices of a common rolling mill, a precision calender is equipped with a device for ensuring calendering accuracy.

[0003] In the prior art, for the utility model with the authorization publication number: CN203004187U and the name: A four-roll calender, the device proposed in this patent document changes the traditional transmission mode of the calender, greatly improves the transmission efficiency, effectively reduces the energy consumption, makes the equipment operate more smoothly, and the rotation speeds of each roll can be adjusted independently, making it more flexible and convenient to use. It can realize both double-sided pasting and calendaring, single-sided sizing, and can also be used as a three-roll calender. The output has increased by 30% compared with that before the transformation, can adapt to various working conditions, truly realizes multi-functional use of one machine, and at the same time, the maintenance or repair of each component can be carried out independently, greatly reducing the maintenance cost, reducing the noise, and prolonging the service life of the rolls and the reducer.

[0004] In the prior art, for the utility model with the authorization publication number: CN211386306U and the name: A recoverable oil liquid type stainless steel strip calender, the device proposed in this patent document, the recoverable oil liquid type stainless steel strip calender can be used to block the splashing oil liquid through a protective cover, avoiding the oil liquid splashing to other areas outside the calender roll. After the oil liquid is blocked by the protective cover, it can flow along the diversion plate of the protective cover to the storage tank, and the storage tank receives the oil liquid dropped from the diversion plate and stores it. The collected oil liquid can be reused, improving its utilization rate.

[0005] However, although the devices proposed in the above two patent documents can facilitate a significant improvement in the processing efficiency during workpiece processing and prevent the splashing of processing oil liquid, in actual use, it is not convenient to adjust the gears during workpiece processing, so the use effect is relatively fixed and the practicability needs to be improved. Summary of the Utility Model

[0006] The utility model provides a four-roll cold rolling mill with adjustable gears, which solves the problems in the related technology that it is not convenient to adjust the gears during workpiece processing and the application range is not good enough.

[0007] The technical solution of the present utility model is as follows: It includes a placement layer, on the upper part of which there is a rolling mill main body, two welding platforms, two rolling mill turning rolls, two thickness gauges, two sheet metal spraying systems, two external clamping mechanisms, and two hydraulic pipe positions fixedly communicated with the outer surface of the rolling mill main body. The two welding platforms are located between the mutually adjacent side surfaces of the two rolling mill turning rolls, and the thickness gauges, sheet metal spraying systems, external clamping mechanisms, and hydraulic pipe positions are successively located between the mutually adjacent side surfaces of the two welding platforms. The mutually adjacent side surfaces of the two hydraulic pipe positions are both connected to the rolling mill main body. On the mutually opposite side surfaces of the two welding platforms, there are both installed coiling mechanisms, and a coiling machine protective cover is hinged on the outer surface of the coiling mechanism.

[0008] Preferably, a loading cart is installed on the upper part of the placement layer, and a coil unrolling mechanism is installed on the upper part of the loading cart through a supporting component. The loading cart and the coil unrolling mechanism can be self-installed on the left and right parts of the rolling mill main body. By setting the loading cart, the loading cart is of a four-guide-column type and is composed of a lifting platform frame, a trolley seat, a lifting oil cylinder, guide columns, an oil cylinder, etc. Its main function is to transport the steel coil to be rolled.

[0009] Preferably, both of the two external clamping mechanisms include hydraulic cylinder fixing plates. On the upper surfaces of the two hydraulic cylinder fixing plates, there are both installed two first hydraulic cylinders, and an external clamping housing base plate is arranged outside the first hydraulic cylinders. An external clamping movable plate is slidably connected inside the external clamping housing base plate. The output end of the first hydraulic cylinder slidably penetrates the bottom surface of the external clamping housing base plate and contacts the bottom surface of the external clamping movable plate. An external clamping top plate is arranged on the upper part of the external clamping housing base plate. By setting the external clamping mechanism, the external clamping mechanism is of a frame structure. The main function of the first hydraulic cylinder is to clamp the workpiece, establish tension, and improve the surface quality of the workpiece.

[0010] Preferably, both of the two coiling mechanisms include coiling motor bases. On the upper surfaces of the coiling motor bases, there are installed coiling machine frames. On the upper surface of the coiling machine frame, there is installed a coiling motor. A brake disc is installed on the coupling connected to the output end of the coiling machine frame. A coiling speed reducer is installed on the coupling connected to the output end of the coiling machine frame. A clutch assembly is installed at the connection end of the coiling speed reducer. A solid mandrel is installed at one end of the clutch assembly away from the coiling speed reducer. By setting the coiling mechanism, the main function of the coiling mechanism is to wind the workpiece, form a certain tension with the rolling mill, and the coiling method is down coiling.

[0011] Preferably, the two unwinding mechanisms include unwinding head bases mounted on the upper surface of the placement layer. The upper surfaces of the two unwinding head bases are fixedly connected with two unwinding bearing seats. The outer surface of the right unwinding bearing seat is provided with a second hydraulic cylinder, and the output end of the second hydraulic cylinder penetrates through the unwinding bearing seat on the same side and is fixedly connected with an unwinding main shaft. Two unwinding brake hubs are mounted on the outer surface of the unwinding main shaft. By setting the unwinding mechanism, the pull rod of the second hydraulic cylinder drives the tapered sleeve to move to tighten the steel strip. The power of the rolling mill leads the steel strip to the right reel. When it stops, the unwinding bearing seat works to brake the unwinding main shaft to prevent loose winding.

[0012] Preferably, a telescopic plate is sleeved on the outer surface of the unwinding main shaft, and a winding positioning disk is installed inside the telescopic plate. Two telescopic sliders and a telescopic pull rod are installed inside the telescopic plate, and the telescopic pull rod is located inside the two telescopic sliders. A sliding sleeve end cover is installed at the left end of the telescopic pull rod. By setting the telescopic plate, the main function is to tighten the steel coil, prevent the unwinding steel strip from slipping between the unwinding machine, and facilitate the subsequent stable processing work of the workpiece.

[0013] Preferably, a rolling mill protective cover is provided above the placement layer, and the rolling mill protective cover is installed above the rolling mill main body. By setting the rolling mill protective cover, it can better facilitate the protection of the rolling mill main body, thereby greatly improving the use safety of the rolling mill main body.

[0014] Preferably, two clamping limit blocks are fixedly connected to the installation grooves on the upper surface of the placement layer, and the clamping limit blocks are located outside the rolling mill main body. The mutually approaching side surfaces of the two clamping limit blocks are in contact with the outer surface of the rolling mill main body. By setting the clamping limit blocks, it can better facilitate the stable support and clamping of the rolling mill main body, and greatly improve the practicability of the overall device.

[0015] The working principle and beneficial effects of the present utility model are as follows:

[0016] 1. In the present utility model, when rough rolling is required, the rolling mill main body is set to a low speed gear. The blank is loaded into the unwinding mechanism and the workpiece is transported into the rolling mill main body for processing through the welding platform, rolling mill turning roller, thickness gauge, sheet metal spraying system, external clamping mechanism, hydraulic pipe position, and winding mechanism. After processing, the workpiece is transported again to the welding platform, rolling mill turning roller, thickness gauge, sheet metal spraying system, external clamping mechanism, hydraulic pipe position, and winding mechanism on the other side to clamp, tighten, and scrape the liquid of the workpiece, and then the processed workpiece is wound and collected by the winding mechanism on the other side. When fine rolling, the rolling mill main body is set to a high speed gear, and the winding mechanism on one side acts as a feeding mechanism, so that the workpiece can be finely rolled, and reversible rolling can also be carried out according to different material rolling mill processes. Description of the Drawings

[0017] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 It is a schematic structural diagram of the overall device of the present utility model;

[0019] Figure 2 It is a schematic structural diagram of the outer cloth clamping mechanism of the present utility model;

[0020] Figure 3 It is a schematic structural diagram of the coiling mechanism of the present utility model;

[0021] Figure 4 It is a schematic structural diagram of the rolling mill turning roll of the present utility model;

[0022] Figure 5 It is a schematic structural diagram of the uncoiling mechanism of the present utility model;

[0023] Figure 6 It is a schematic structural diagram of the loading cart of the present utility model.

[0024] In the figure: 1. Placing layer; 2. Rolling mill main body; 3. Welding platform; 4. Rolling mill turning roll; 5. Thickness gauge; 6. Sheet metal spraying system; 7. Outer cloth clamping mechanism; 701. Hydraulic cylinder fixing plate; 702. First hydraulic cylinder; 703. Outer cloth clamping housing foot plate; 704. Outer cloth clamping movable plate; 705. Outer cloth clamping top plate; 8. Hydraulic pipe position; 9. Coiling mechanism; 901. Coiling motor base; 902. Coiling machine frame; 903. Coiling motor; 904. Brake disc; 905. Coiling reducer; 906. Clutch assembly; 907. Solid winding drum; 10. Coiling machine protective cover; 11. Loading cart; 12. Uncoiling mechanism; 1201. Uncoiling head base; 1202. Uncoiling bearing seat; 1203. Second hydraulic cylinder; 1204. Uncoiling brake hub; 1205. Uncoiling main shaft; 1206. Winding positioning disc; 1207. Expanding and contracting plate; 1208. Expanding and contracting slider; 1209. Expanding and contracting pull rod; 1210. Sleeve end cover; 13. Rolling mill protective cover; 14. Clamping limit block. Specific embodiments

[0025] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model.

[0026] Embodiment 1

[0027] Such as Figures 1 to 6As shown in the figure, this embodiment proposes a four-roll cold rolling mill with adjustable gears, including a placement layer 1. Above the placement layer 1, there is a rolling mill main body 2, two welding platforms 3, two rolling mill turning rolls 4, two thickness gauges 5, two sheet metal spraying systems 6, two external clamping mechanisms 7, and two hydraulic pipe positions 8 fixedly connected to the outer surface of the rolling mill main body 2.

[0028] In this embodiment, referring to Figure 1 , when rough rolling is required, the rolling mill main body 2 is set to a low speed gear. The blank is loaded into the uncoiling mechanism 12, and the workpiece is transported into the rolling mill main body 2 through the welding platform 3, rolling mill turning roll 4, thickness gauge 5, sheet metal spraying system 6, external clamping mechanism 7, hydraulic pipe position 8, and coiling mechanism 9 for processing. After processing, the workpiece is transported again to the welding platform 3, rolling mill turning roll 4, thickness gauge 5, sheet metal spraying system 6, external clamping mechanism 7, hydraulic pipe position 8, and coiling mechanism 9 on the other side to clamp, tighten, and scrape the liquid from the workpiece. Then, the processed workpiece is wound and collected by the coiling mechanism 9 on the other side.

[0029] An uncoiling cart 11 is installed above the placement layer 1. Above the uncoiling cart 11, an uncoiling mechanism 12 is installed through a support component. The uncoiling cart 11 and the uncoiling mechanism 12 can be self-installed on the left and right parts of the rolling mill main body 2. By setting the uncoiling cart 11, the uncoiling cart 11 is of a four-guide column type, consisting of a lifting platform frame, a trolley seat, a lifting oil cylinder, guide columns, an oil cylinder, etc. Its main function is to transport the steel coil to be rolled. And the lifting of the trolley is hydraulically driven, and the movement in and out is driven by a motor reducer, so as to greatly improve the transportation stability of the trolley for the material.

[0030] Both of the two external clamping mechanisms 7 include a hydraulic cylinder fixing plate 701. On the upper surface of the two hydraulic cylinder fixing plates 701, two first hydraulic cylinders 702 are installed. And outside the first hydraulic cylinders 702, there is an external clamping housing base plate 703. Inside the external clamping housing base plate 703, an external clamping movable plate 704 is slidably connected. The output end of the first hydraulic cylinder 702 slidably penetrates the bottom surface of the external clamping housing base plate 703 and contacts the bottom surface of the external clamping movable plate 704. Above the external clamping housing base plate 703, there is an external clamping top plate 705. By setting the external clamping mechanism 7, the external clamping mechanism 7 is of a frame structure. The main function of the first hydraulic cylinder 702 is to clamp the workpiece, establish tension, so as to quickly and effectively remove the rolling fluid remaining on the workpiece, and provide a certain post-tension to improve the surface quality of the workpiece.

[0031] The two coiling mechanisms 9 each include a coiling motor base 901, and a coiling machine frame 902 is installed on the upper surface of the coiling motor base 901. A coiling motor 903 is installed on the upper surface of the coiling machine frame 902, and a brake disc 904 is installed on the coupling connected to the output end of the coiling machine frame 902. A coiling speed reducer 905 is installed on the coupling connected to the output end of the coiling machine frame 902, and a clutch assembly 906 is installed at the connecting end of the coiling speed reducer 905. A solid winding drum 907 is installed at one end of the clutch assembly 906 away from the coiling speed reducer 905. By setting the coiling mechanism 9, the main function of the coiling mechanism 9 is to wind workpieces and form a certain tension with the rolling mill, and the coiling method is down-coiling. The solid winding drum 907 itself is connected to the output shaft of the coiling speed reducer 905 through the clutch assembly 906, and there are bearing seats at both ends, which are placed in the two semi-circular holes of the winding drum frame. The coiling speed reducer 905 is a hard tooth surface cylindrical gear speed reducer, and the gear material is low-carbon alloy steel, which is carburized, quenched and ground, with low noise and wear resistance.

[0032] The two unwinding mechanisms 12 include unwinding head bases 1201 installed on the upper surface of the placing layer 1. Two unwinding bearing seats 1202 are fixedly connected to the upper surfaces of the two unwinding head bases 1201. A second hydraulic cylinder 1203 is installed on the outer surface of the right unwinding bearing seat 1202, and the output end of the second hydraulic cylinder 1203 penetrates through the unwinding bearing seat 1202 on the same side and is fixedly connected to an unwinding main shaft 1205. Two unwinding brake hubs 1204 are installed on the outer surface of the unwinding main shaft 1205. By setting the unwinding mechanism 12, the pull rod of the second hydraulic cylinder 1203 drives the tapered sleeve to move to tighten the steel strip. The power of the rolling mill leads the steel strip to the right winding drum. When it stops, the unwinding bearing seat 1202 works to brake the unwinding main shaft 1205 to prevent loose winding.

[0033] Embodiment 2

[0034] As Figures 3 to 4 shown, based on the same concept as the above Embodiment 1, this embodiment also proposes that two welding platforms 3 are located between the adjacent side surfaces of the two rolling mill turning rolls 4, and the thickness gauge 5, the sheet metal spraying system 6, the outer clamping mechanism 7, and the hydraulic pipe position 8 are sequentially located between the adjacent side surfaces of the two welding platforms 3. The adjacent side surfaces of the two hydraulic pipe positions 8 are both connected to the rolling mill main body 2. The opposite side surfaces of the two welding platforms 3 are both installed with coiling mechanisms 9, and a coiling machine protective cover 10 is hinged on the outer surface of the coiling mechanism 9.

[0035] In this embodiment, referring to Figure 1When the finishing mill is in operation and the main body 2 of the rolling mill is set to the high-speed gear, the coiling mechanism 9 on one side is used for unwinding. The workpiece is transported into the main body 2 of the rolling mill through the welding platform 3, the rolling mill turning roller 4, the thickness gauge 5, the sheet metal spraying system 6, the external clamping mechanism 7, the hydraulic pipe position 8, and the coiling mechanism 9 for processing. After processing, the workpiece is transported again to the welding platform 3, the rolling mill turning roller 4, the thickness gauge 5, the sheet metal spraying system 6, the external clamping mechanism 7, the hydraulic pipe position 8, and the coiling mechanism 9 on the other side for clamping, tensioning, and liquid scraping of the workpiece. Then, the processed workpiece is wound and collected by the coiling mechanism 9 on the other side, enabling the finishing rolling of the workpiece and also allowing for reversible rolling according to different material rolling mill processes.

[0036] A shrinkage-expansion plate 1207 is sleeved on the outer surface of the unwind spindle 1205. A winding positioning disk 1206 is installed inside the shrinkage-expansion plate 1207. Two shrinkage-expansion sliders 1208 and a shrinkage-expansion pull rod 1209 are installed inside the shrinkage-expansion plate 1207, and the shrinkage-expansion pull rod 1209 is located inside the two shrinkage-expansion sliders 1208. A sliding sleeve end cover 1210 is installed at the left end of the shrinkage-expansion pull rod 1209. By setting the shrinkage-expansion plate 1207, the main function is to tension the steel coil, prevent slippage between the uncoiling steel strip and the uncoiler, so as to facilitate the limiting and tensioning of the workpiece, avoid sliding, and facilitate the subsequent processing of the workpiece.

[0037] A rolling mill protective cover 13 is provided above the placement layer 1, and the rolling mill protective cover 13 is installed on the upper part of the main body 2 of the rolling mill. By setting the rolling mill protective cover 13, it can better protect the main body 2 of the rolling mill, and also prevent dust or foreign objects from falling into the main body 2 of the rolling mill, thus avoiding the risk of damage to the main body 2 of the rolling mill and greatly improving the safety of use of the main body 2 of the rolling mill.

[0038] Two clamping limit blocks 14 are fixedly connected to the installation grooves on the upper surface of the placement layer 1, and the clamping limit blocks 14 are located outside the main body 2 of the rolling mill. The mutually approaching side surfaces of the two clamping limit blocks 14 are in contact with the outer surface of the main body 2 of the rolling mill. By setting the clamping limit blocks 14, it can better stably support and clamp the main body 2 of the rolling mill, thus preventing the main body 2 of the rolling mill from shaking during operation and affecting the workpiece processing, and greatly improving the practicality of the overall device.

[0039] Working principle: When rough rolling is required, the main body 2 of the rolling mill is set to the low-speed gear. The blank is loaded into the unwinding mechanism 12, and the workpiece is transported into the main body 2 of the rolling mill through the welding platform 3, the rolling mill turning roll 4, the thickness gauge 5, the sheet metal spraying system 6, the external clamping mechanism 7, the hydraulic pipe position 8, and the coiling mechanism 9 for processing. After processing, the workpiece is transported again to the welding platform 3, the rolling mill turning roll 4, the thickness gauge 5, the sheet metal spraying system 6, the external clamping mechanism 7, the hydraulic pipe position 8, and the coiling mechanism 9 on the other side to clamp, tighten, and scrape the liquid from the workpiece. Thus, the processed workpiece is wound and collected through the coiling mechanism 9 on the other side. When finish rolling, the main body 2 of the rolling mill is set to the high-speed gear. The coiling mechanism 9 on one side acts as a feeder, and the workpiece is transported into the main body 2 of the rolling mill through the welding platform 3, the rolling mill turning roll 4, the thickness gauge 5, the sheet metal spraying system 6, the external clamping mechanism 7, the hydraulic pipe position 8, and the coiling mechanism 9 for processing. After processing, the workpiece is transported again to the welding platform 3, the rolling mill turning roll 4, the thickness gauge 5, the sheet metal spraying system 6, the external clamping mechanism 7, the hydraulic pipe position 8, and the coiling mechanism 9 on the other side to clamp, tighten, and scrape the liquid from the workpiece. Thus, the processed workpiece is wound and collected through the coiling mechanism 9 on the other side, enabling finish rolling of the workpiece and also enabling reversible rolling according to different material rolling mill processes. Therefore, the appropriate gear can be adjusted according to different requirements to process the workpiece, greatly improving the application range and practicability of the device.

[0040] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A four-roller cold rolling mill with adjustable gear position, characterized in that: The invention comprises a placement layer (1), wherein the upper part of the placement layer (1) is provided with a rolling mill body (2), two welding platforms (3), two rolling mill steering rollers (4), two thickness gauges (5), two sheet metal spray systems (6), two external cloth clamping mechanisms (7), and two hydraulic pipe positions (8) fixedly connected to the outer surface of the rolling mill body (2); the two welding platforms (3) are located between the sides of the two rolling mill steering rollers (4) that are close to each other, and the thickness gauges (5), the sheet metal spray system (6), the external cloth clamping mechanisms (7) and the hydraulic pipe positions (8) are all located in sequence between the sides of the two welding platforms (3) that are close to each other, the sides of the two hydraulic pipe positions (8) that are close to each other are both connected to the rolling mill body (2), and the sides of the two welding platforms (3) that are away from each other are both equipped with a coiling mechanism (9), and the outer surface of the coiling mechanism (9) is hinged with a coiling machine protective cover (10).

2. A four-roller cold rolling mill with adjustable gear position according to claim 1, characterized in that: A loading car (11) is installed on the upper part of the placement layer (1), and a reeling mechanism (12) is installed on the upper part of the loading car (11) through a supporting component, and the loading car (11) and the reeling mechanism (12) can be installed on the left and right parts of the rolling mill body (2) by themselves.

3. The four-roller cold rolling mill with adjustable gear position according to claim 1, characterized in that: The two outer cloth clamping mechanisms (7) each include a hydraulic cylinder fixing plate (701), the upper surfaces of the two hydraulic cylinder fixing plates (701) are each mounted with two first hydraulic cylinders (702), and the outer part of the first hydraulic cylinder (702) is provided with an outer cloth clamping arch foot plate (703), the inner part of the outer cloth clamping arch foot plate (703) is slidably connected with an outer cloth clamping movable plate (704), the output end of the first hydraulic cylinder (702) slides through the bottom surface of the outer cloth clamping arch foot plate (703) and contacts with the bottom surface of the outer cloth clamping movable plate (704), and the upper part of the outer cloth clamping arch foot plate (703) is provided with an outer cloth clamping top plate (705).

4. The four-roller cold rolling mill with adjustable gear position according to claim 1, characterized in that: The two winding mechanisms (9) each include a winding motor base (901), and a winding machine frame (902) is mounted on the upper surface of the winding motor base (901), a winding motor (903) is mounted on the upper surface of the winding machine frame (902), and a brake disc (904) is mounted on a coupling connected to the output end of the winding machine frame (902), a winding reducer (905) is mounted on the coupling connected to the output end of the winding machine frame (902), and a clutch assembly (906) is mounted on the connecting end of the winding reducer (905), and a solid reel (907) is mounted on the end of the clutch assembly (906) away from the winding reducer (905).

5. The four-roller cold rolling mill with adjustable gear position according to claim 2, characterized in that: The two unwinding mechanisms (12) include an unwinding head base (1201) installed on the upper surface of the placement layer (1), and the upper surfaces of the two unwinding head bases (1201) are fixedly connected to two unwinding bearing seats (1202), and the outer surface of the right unwinding bearing seat (1202) is installed with a second hydraulic cylinder (1203), and the output end of the second hydraulic cylinder (1203) passes through the unwinding bearing seat (1202) on the same side and is fixedly connected to an unwinding main shaft (1205), and the outer surface of the unwinding main shaft (1205) is installed with two unwinding brake hubs (1204).

6. The four-roller cold rolling mill with adjustable gear position according to claim 5, characterized in that: The outer surface of the unwinding main shaft (1205) is sleeved with an expansion and contraction plate (1207), and a winding positioning disk (1206) is installed inside the expansion and contraction plate (1207). Two expansion and contraction sliders (1208) and an expansion and contraction pull rod (1209) are installed inside the expansion and contraction plate (1207), and the expansion and contraction pull rod (1209) is located inside the two expansion and contraction sliders (1208). A sliding sleeve end cover (1210) is installed at the left end of the expansion and contraction pull rod (1209).

7. The four-roller cold rolling mill with adjustable gear position according to claim 1, characterized in that: A rolling mill protection cover (13) is provided on the upper part of the placement layer (1), and the rolling mill protection cover (13) is installed on the upper part of the rolling mill body (2).

8. The four-roller cold rolling mill with adjustable gear position according to claim 1, characterized in that: Two clamping limit blocks (14) are fixedly connected to the mounting groove on the upper surface of the placement layer (1), and the clamping limit blocks (14) are located outside the rolling mill body (2), and the side surfaces of the two clamping limit blocks (14) that are close to each other are in contact with the outer surface of the rolling mill body (2).

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