Middle roller seat of cold rolling mill

Abstract

The utility model relates to the technical field of cold-rolling mills, in particular to a roller seat of a middle roller of a cold-rolling mill, which changes a force application angle to a steel belt, increases an adjustment parameter compared with the prior art, and is favorable for further improving the cold-rolling quality of the steel belt. Comprising a front memorial archway, a rear memorial archway, bearing rollers and working rollers, the rolling mill further comprises four fan-shaped sliding grooves, four sliding blocks, a plurality of first push cylinders and two middle rollers, the two fan-shaped sliding grooves are symmetrically formed in the front memorial archway and the rear memorial archway and located between the bearing rollers and the working rollers, the circle centers of the four fan-shaped sliding grooves are concentric with the axes of the adjacent working rollers, and the center of each fan-shaped sliding groove is located between the corresponding first push cylinder and the corresponding second push cylinder. The four sliding blocks are installed in the four fan-shaped sliding grooves in a sliding mode respectively, the inner ends of the first push cylinders are rotationally connected with the left sides and the right sides of the four sliding blocks respectively, the outer ends of the first push cylinders are rotationally connected with the left sides and the right sides of the front memorial archway and the rear memorial archway respectively, and the two ends of rotating shafts of the two middle rollers are rotationally installed on the four sliding blocks respectively.

Description

Technical Field

[0001] The utility model relates to the technical field of cold rolling mills, in particular to a middle roll stand of a cold rolling mill. Background Art

[0002] The middle roll of the cold rolling mill is arranged between the working roll and the load-bearing roll. The middle roll applies rolling force to the working roll and moves along its axis. The position and method of the force applied by the working roll to the rolled steel strip can be adjusted, and the rolling quality of the steel strip can be improved. Therefore, the middle roll roll seat of the cold rolling mill in the prior art generally has a structure that allows the middle roll to move along its axis and can accurately control the displacement of the movement.

[0003] However, the middle roll stand of the prior art is not convenient for adjusting the contact angle between the middle roll and the working roll, and thus is not convenient for adjusting the rolling force angle of the working roll on the steel strip, which is not conducive to further improving the cold rolling quality of the steel strip. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a middle roll stand of a cold rolling mill which changes the force application angle on the steel strip and adds an adjustment parameter compared with the prior art, which is beneficial to further improve the cold rolling quality of the steel strip.

[0005] The utility model discloses a middle roll roller seat of a cold rolling mill, comprising a front arch, a rear arch, a load-bearing roller and a working roller, wherein the front arch and the rear arch are symmetrically arranged, and the front arch and the rear arch have the same structure, two load-bearing rollers are symmetrically rotatably installed between the front arch and the rear arch, the two load-bearing rollers are respectively located at the upper part and the lower part of the front arch and the rear arch, two working rollers are symmetrically rotatably installed between the front arch and the rear arch, and the two working rollers are located at the middle part of the front arch and the rear arch; the utility model also comprises four fan-shaped slide grooves, four slide blocks, a plurality of push cylinders, and two middle rollers, two fan-shaped slides are symmetrically arranged on the front arch and the rear arch, the two fan-shaped slides are respectively located between the load-bearing roller and the working roller, the centers of the four fan-shaped slides are respectively concentric with the axes of the adjacent working rollers, four sliders are respectively slidably installed in the four fan-shaped slides, the inner ends of the multiple push cylinders are respectively rotatably connected to the left and right sides of the four sliders, the outer ends of the multiple push cylinders are respectively rotatably connected to the left and right sides of the front arch and the rear arch, and the two ends of the rotating shafts of the two middle rollers are respectively rotatably installed on the four sliders; working When the steel strip passes between the two working rolls, an external driving mechanism drives the two working rolls to rotate synchronously relative to each other to roll the steel strip, and the two middle rolls are driven by the two working rolls to rotate, and the two load-bearing rolls indirectly support the two working rolls by supporting the two middle rolls, so that the two working rolls are sufficiently stable. When it is necessary to adjust the force angle of the two working rolls on the steel strip, the multiple push cylinders on the left side contract and the multiple push cylinders on the right side extend, thereby pushing the four sliding blocks to move synchronously along the four fan-shaped slide grooves, thereby changing the contact angle between the two middle rolls and the two working rolls, and the adjustment components of the two load-bearing rolls push the two middle rolls inward synchronously, so that the two load-bearing rolls maintain support for the two middle rolls, thereby changing the support angle of the two working rolls, thereby changing the force angle of the two working rolls on the steel strip. Compared with the prior art, an adjustment parameter is added, which is beneficial to further improve the cold rolling quality of the steel strip. The adjustment components of the two load-bearing rolls belong to the prior art and are not the technical solution to be protected by this application, and are not described in detail here.

[0006] Preferably, four roller bearings are also included, and two of the rotating shafts of the two middle rollers are rotatably installed in four sliding blocks through four roller bearings respectively; by setting the roller bearings, the rotation of the two middle rollers is smoother and more stable, and sufficient supporting force can be guaranteed.

[0007] Preferably, it also includes a shaft end sleeve, a threaded rod, a slide rail, a threaded slider and two push cylinders. The four screw rods are respectively installed in the four sliders. The shaft end sleeves are slidably inserted in the inner rings of the four roller bearings. The rotating shaft of the middle roller is concentrically pressed into the shaft end sleeve. The outer ends of the multiple shaft end sleeves are concentrically arranged with threaded rods. The thread rotation directions of the threaded rod on the front arch and the threaded rod on the rear arch are opposite. Slide rails are arranged on the left and right parts of the four sliders. The threaded sliders are slidably installed on the multiple slide rails. Semicircular grooves matching the threaded rods are arranged on the opposite surfaces of the two threaded sliders on the same slider, and internal threads matching the threads of the threaded rods are arranged on the inner walls of the semicircular grooves. Two of the multiple push cylinders are respectively connected to the same sliders. Two threaded sliders on the block; the two working rolls drive the two middle rolls to rotate, and the two middle rolls drive the four shaft end sleeves and four threaded rods at both ends to rotate. When the two middle rolls need to be moved axially, the multiple push cylinders 2 located on the front arch contract synchronously, so that the four threaded sliders on the front arch approach and contact the two threaded rods synchronously, so that the internal threads of the semicircular grooves of the four threaded sliders are respectively engaged with the threads of the two threaded rods, and under the action of the threads, the two shaft end sleeves drive the two middle rolls to move toward the side of the front arch; correspondingly, the multiple push cylinders 2 located on the rear arch contract synchronously, so that the two shaft end sleeves can drive the two middle rolls to move toward the side of the rear arch; the two middle rolls can be moved along the axis, with a simple structure and a small size.

[0008] Preferably, the inner ring of the roller bearing is provided with a multi-deformable socket, the outer wall of the shaft end sleeve is set to a polygon, and the multi-deformability of the shaft end sleeve matches the multi-deformable socket of the roller bearing; through the above arrangement, the transmission between the shaft end sleeve and the inner end of the roller bearing is stable.

[0009] Preferably, it also includes end rods and protrusions, the outer ends of the two shaft end sleeves located on the front arch are concentrically arranged with end rods, and the outer ends of multiple end rods are concentrically arranged with protrusions, and the edges of the protrusions protrude outside the end rods; by arranging the end rods and the protrusions, it is convenient to use clamping, and then it is convenient to remove the shaft end sleeves from the roller bearing, thereby improving the convenience of operation.

[0010] Preferably, it also includes a cross beam, two clamping plates, two screw rods two and two push cylinders three, a slide groove is arranged in the middle of the cross beam, and the two clamping plates are symmetrically slidably installed on both sides of the slide groove of the cross beam, one end of the screw rods two are rotatably connected with the two clamping plates, and the other end of the screw rods two are rotatably screwed with the two sides of the cross beam, and the fixed ends of the two push cylinders three are respectively installed at the two ends of the cross beam; when it is necessary to remove the shaft end sleeve from the roller bearing, and then disassemble the middle roller and replace the middle roller, the middle part of the slide groove of the cross beam is inserted into the end rod, and the two screw rods two are rotated. The threads of the two screw rods two make the two clamping plates relatively close to each other, so that the inner ends of the two clamping plates clamp the two sides of the end rod respectively, and the outer end surfaces of the two clamping plates contact the inner side walls of the protrusions, and the piston rods of the two push cylinders three are extended, so that the piston rods of the two push cylinders three are against the outer side walls of the front arch or the rear arch, and the piston rods of the two push cylinders three continue to be produced, thereby removing the shaft end sleeve from the roller bearing, which has good practicality.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: during operation, the steel strip passes between the two working rollers, and an external driving mechanism drives the two working rollers to rotate synchronously relative to each other to roll the steel strip, and the two middle rollers are driven by the two working rollers to rotate, and the two load-bearing rollers indirectly support the two working rollers by supporting the two middle rollers, so that the two working rollers are sufficiently stable, and when it is necessary to adjust the force angle of the two working rollers on the steel strip, the multiple push cylinders on the left side are contracted, and the multiple push cylinders on the right side are extended, thereby pushing the four sliders to move synchronously along the four fan-shaped slide grooves, thereby changing the contact angle between the two middle rollers and the two working rollers, and the adjustment components of the two load-bearing rollers push the two middle rollers inward synchronously, so that the two load-bearing rollers maintain support for the two middle rollers, thereby changing the support angle of the two working rollers, thereby changing the force angle of the two working rollers on the steel strip. Compared with the prior art, an adjustment parameter is added, which is beneficial to further improve the cold rolling quality of the steel strip. The adjustment components of the two load-bearing rollers belong to the prior art and are not the technical solution to be protected by this application, and are not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a rear axonometric structural schematic diagram of the utility model;

[0014] Figure 3 It is a structural diagram of the front archway, fan-shaped slide, slider and push cylinder;

[0015] Figure 4 It is a partial cross-sectional structural diagram of the slider, roller bearing, shaft end sleeve, threaded rod and slide rail;

[0016] Figure 5It is a schematic diagram of the structure of the roller bearing, shaft end sleeve, threaded rod, threaded slider and push cylinder in the exploded state;

[0017] Figure 6 It is a structural diagram of a crossbeam, a clamping plate, screw rod 2 and a push cylinder 3.

[0018] Markings in the attached drawings: 1. front arch; 2. rear arch; 3. load-bearing roller; 4. working roller; 5. fan-shaped slide; 6. slider; 7. push cylinder one; 8. middle roller; 9. roller bearing; 10. shaft end sleeve; 11. threaded rod; 12. slide rail; 13. threaded slider; 14. push cylinder two; 15. end rod; 16. bump; 17. crossbeam; 18. clamping plate; 19. screw rod two; 20. push cylinder three. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0020] Example 1

[0021] like Figures 1 to 3 As shown, a middle roll roll stand of a cold rolling mill comprises a front arch 1, a rear arch 2, a load-bearing roll 3 and a working roll 4. The front arch 1 and the rear arch 2 are symmetrically arranged, and the front arch 1 and the rear arch 2 have the same structure. Two load-bearing rolls 3 are symmetrically rotatably installed between the front arch 1 and the rear arch 2, and the two load-bearing rolls 3 are respectively located at the upper and lower parts of the front arch 1 and the rear arch 2. Two working rolls 4 are symmetrically rotatably installed between the front arch 1 and the rear arch 2, and the two working rolls 4 are located in the middle of the front arch 1 and the rear arch 2; it also comprises four fan-shaped slide grooves 5, four sliders 6, a plurality of push cylinders 7, and two middle rolls 8, which are symmetrically arranged on the front arch 1 and the rear arch 2. Two fan-shaped chutes 5 are arranged, and the two fan-shaped chutes 5 are respectively located between the load-bearing roller 3 and the working roller 4, and the centers of the four fan-shaped chutes 5 are respectively concentric with the axes of the adjacent working rollers 4, and four sliders 6 are respectively slidably installed in the four fan-shaped chutes 5, and the inner ends of the plurality of push cylinders 7 are respectively rotatably connected to the left and right sides of the four sliders 6, and the outer ends of the plurality of push cylinders 7 are respectively rotatably connected to the left and right sides of the front arch 1 and the rear arch 2, and the two ends of the rotating shafts of the two middle rollers 8 are respectively rotatably installed on the four sliders 6; it also includes four roller bearings 9, and the two ends of the rotating shafts of the two middle rollers 8 are respectively rotatably installed in the four sliders 6 through the four roller bearings 9.

[0022] During operation, the steel strip passes between the two working rollers 4, and the external driving mechanism drives the two working rollers 4 to rotate synchronously relative to each other to roll the steel strip. The two middle rollers 8 are driven to rotate by the two working rollers 4, and the two load-bearing rollers 3 indirectly support the two working rollers 4 by supporting the two middle rollers 8, so that the two working rollers 4 are sufficiently stable. When it is necessary to adjust the force angle of the two working rollers 4 on the steel strip, the multiple push cylinders 7 on the left side are contracted, and the multiple push cylinders 7 on the right side are extended, thereby pushing the four sliders 6 to move synchronously along the four fan-shaped slide grooves 5, thereby changing the contact angle between the two middle rollers 8 and the two working rollers 4 The adjustment components of the two load-bearing rollers 3 push the two middle rollers 8 inward synchronously, so that the two load-bearing rollers 3 maintain support for the two middle rollers 8, thereby changing the support angle of the two working rollers 4, thereby changing the force angle of the two working rollers 4 on the steel strip. Compared with the prior art, an adjustment parameter is added, which is beneficial to further improve the cold rolling quality of the steel strip. The adjustment components of the two load-bearing rollers 3 belong to the prior art and are not the technical solution to be protected by this application. They are not described in detail here. By setting the roller bearings 9, the rotation of the two middle rollers 8 is smoother and more stable, and sufficient support force can be guaranteed.

[0023] Example 2

[0024] like Figure 4 and Figure 5 As shown, on the basis of embodiment 1, it also includes a shaft end sleeve 10, a threaded rod 11, a slide rail 12, a threaded slider 13 and a push cylinder 14, four screw rods 19 are respectively installed in the four sliders 6, the shaft end sleeve 10 is slidably inserted in the inner ring of the four roller bearings 9, the rotating shaft of the middle roller 8 is concentrically pressed into the shaft end sleeve 10, the outer ends of the plurality of shaft end sleeves 10 are concentrically provided with a threaded rod 11, the threaded direction of the threaded rod 11 located on the front arch 1 and the threaded rod 11 located on the rear arch 2 are opposite, and the left and right parts of the four sliders 6 are provided with A slide rail 12, and a plurality of slide rails 12 are slidably installed with threaded sliders 13, and semicircular grooves matching the threaded rod 11 are arranged on opposite surfaces of the two threaded sliders 13 located on the same slider 6, and internal threads matching the threads of the threaded rod 11 are arranged on the inner walls of the semicircular grooves. Two of the plurality of push cylinders 14 are respectively connected to the two threaded sliders 13 located on the same slider 6, and a multi-deformable jack is arranged on the inner ring of the roller bearing 9, and the outer wall of the shaft end sleeve 10 is arranged to be a polygon, and the multi-deformable shape of the shaft end sleeve 10 matches the multi-deformable jack of the roller bearing 9.

[0025] The two working rollers 4 drive the two middle rollers 8 to rotate, and the two middle rollers 8 drive the four axial end sleeves 10 and four threaded rods 11 at both ends to rotate. When the two middle rollers 8 need to be moved axially, the multiple push cylinders 14 located on the front arch 1 shrink synchronously, so that the four threaded sliders 13 located on the front arch 1 approach and contact the two threaded rods 11 synchronously, so that the internal threads of the semicircular grooves of the four threaded sliders 13 are respectively engaged with the threads of the two threaded rods 11, and under the action of the threads, the two axial end sleeves 10 drive the two middle rollers 8 to move to the side of the front arch 1; correspondingly, the multiple push cylinders 14 located on the rear arch 2 shrink synchronously, so that the two axial end sleeves 10 can drive the two middle rollers 8 to move to the side of the rear arch 2, and the two middle rollers 8 can be moved along the axis.

[0026] Example 3

[0027] like Figure 1 and Figure 6 As shown, on the basis of Example 1, it also includes end rods 15 and protrusions 16, the outer ends of the two shaft end sleeves 10 located on the front arch 1 are concentrically provided with end rods 15, and the outer ends of multiple end rods 15 are concentrically provided with protrusions 16, and the edges of the protrusions 16 protrude outside the end rods 15; it also includes a crossbeam 17, two clamping plates 18, two screw rods 19 and two push cylinders 3 20, a slide groove is set in the middle of the crossbeam 17, and the two clamping plates 18 are symmetrically slidably installed on both sides of the slide groove of the crossbeam 17, one end of the two screw rods 19 are respectively rotatably connected to the two clamping plates 18, and the other ends of the two screw rods 19 are respectively rotatably screwed to the two sides of the crossbeam 17, and the fixed ends of the two push cylinders 3 20 are respectively installed at both ends of the crossbeam 17.

[0028] When it is necessary to remove the shaft end sleeve 10 from the roller bearing 9, and then disassemble the middle roller 8 and replace the middle roller 8, insert the middle part of the slide groove of the crossbeam 17 into the end rod 15, and rotate the two screw rods 19. The threads of the two screw rods 19 make the two clamping plates 18 relatively close to each other, so that the inner ends of the two clamping plates 18 respectively clamp the two sides of the end rod 15, and the outer end surfaces of the two clamping plates 18 contact the inner side walls of the protrusions 16. The piston rods of the two push cylinders 3 20 are extended, so that the piston rods of the two push cylinders 3 20 are against the outer side walls of the front arch 1 or the rear arch 2, and the piston rods of the two push cylinders 3 20 continue to produce, thereby removing the shaft end sleeve 10 from the roller bearing 9, which has good practicality.

[0029] like Figures 1 to 6As shown, the utility model is a middle roll roll seat of a cold rolling mill. When it is working, first, the steel strip passes between the two working rolls 4, and the external driving mechanism drives the two working rolls 4 to rotate synchronously relative to each other to roll the steel strip. The two middle rolls 8 are driven to rotate by the two working rolls 4, and the two load-bearing rolls 3 indirectly support the two working rolls 4 by supporting the two middle rolls 8, so that the two working rolls 4 are sufficiently stable. Then, when it is necessary to adjust the force angle of the two working rolls 4 on the steel strip, the multiple push cylinders 7 on the left side are contracted, and the multiple push cylinders 7 on the right side are extended, thereby pushing the four sliders 6 to move synchronously along the four fan-shaped slide grooves 5, thereby changing the contact angle between the two middle rolls 8 and the two working rolls 4, and the adjustment components of the two load-bearing rolls 3 push the two middle rolls 8 inward synchronously, so that the two load-bearing rolls 3 maintain the support for the two middle rolls 8, thereby changing the support angle for the two working rolls 4, thereby changing the force angle of the two working rolls 4 on the steel strip. Compared with the prior art, an adjustment parameter is added, which is beneficial to further improve the cold rolling quality of the steel strip. Then, when it is necessary to move along the axial direction, When the two middle rollers 8 are moved, the multiple push cylinders 14 on the front arch 1 are contracted synchronously, so that the four threaded sliders 13 on the front arch 1 are synchronously close to and contact the two threaded rods 11, so that the inner threads of the semicircular grooves of the four threaded sliders 13 are respectively engaged with the threads of the two threaded rods 11, and the two shaft end sleeves 10 drive the two middle rollers 8 to move to the side of the front arch 1 under the action of the threads. Finally, when the shaft end sleeves 10 need to be removed from the roller system bearing 9, and then the middle roller 8 is disassembled and replaced, the crossbeam 1 The middle part of the slide groove of 7 is inserted into the end rod 15, and the two screw rods 2 19 are rotated. The threads of the two screw rods 2 19 make the two clamping plates 18 relatively close to each other, so that the inner ends of the two clamping plates 18 respectively clamp the two sides of the end rod 15, and the outer end surfaces of the two clamping plates 18 contact the inner side walls of the protrusions 16. The piston rods of the two push cylinders 3 20 are extended, so that the piston rods of the two push cylinders 3 20 are against the outer side walls of the front arch 1 or the rear arch 2. The piston rods of the two push cylinders 3 20 continue to be produced, so that the shaft end sleeve 10 can be taken out of the roller bearing 9.

[0030] The main functions achieved by this utility model are:

[0031] 1. Changing the force angle on the steel strip adds an adjustment parameter compared to the existing technology, which is conducive to further improving the cold rolling quality of the steel strip;

[0032] 2. The movement of the middle roller can be easily adjusted;

[0033] 3. The middle roller can be easily disassembled and removed.

[0034] The utility model relates to a middle roll stand for a cold rolling mill, and its installation method, connection method or setting method are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented; the utility model relates to a middle roll stand for a cold rolling mill, and the front arch 1, the rear arch 2, the load-bearing roller 3, the working roller 4, the push cylinder 1 7, the middle roller 8, the roller bearing 9, the threaded rod 11, the slide rail 12, the push cylinder 2 14, the screw 2 19, and the push cylinder 3 20 are purchased on the market, and the technical personnel in the industry only need to install and operate them according to the accompanying instruction manual, without the need for the technical personnel in this field to make creative labor.

[0035] All technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A middle roll stand of a cold rolling mill, comprising a front archway (1), a rear archway (2), a load-bearing roll (3) and a working roll (4), wherein the front archway (1) and the rear archway (2) are symmetrically arranged, and the front archway (1) and the rear archway (2) have the same structure, two load-bearing rolls (3) are symmetrically rotatably mounted between the front archway (1) and the rear archway (2), and the two load-bearing rolls (3) are respectively located at the upper part and the lower part of the front archway (1) and the rear archway (2), and two working rolls (4) are symmetrically rotatably mounted between the front archway (1) and the rear archway (2), and the two working rolls (4) are located at the middle part of the front archway (1) and the rear archway (2); characterized in that: It also includes four fan-shaped slide grooves (5), four sliders (6), multiple push cylinders (7), and two middle rollers (8). Two fan-shaped slide grooves (5) are symmetrically arranged on the front archway (1) and the rear archway (2). The two fan-shaped slide grooves (5) are respectively located between the load-bearing roller (3) and the working roller (4). The centers of the four fan-shaped slide grooves (5) are respectively concentric with the axes of the adjacent working rollers (4). The four sliders (6) are respectively slidably installed in the four fan-shaped slide grooves (5). The inner ends of the multiple push cylinders (7) are respectively rotatably connected to the left and right sides of the four sliders (6). The outer ends of the multiple push cylinders (7) are respectively rotatably connected to the left and right sides of the front archway (1) and the rear archway (2). The two ends of the rotating shafts of the two middle rollers (8) are respectively rotatably installed on the four sliders (6).

2. A middle roll stand for a cold rolling mill as claimed in claim 1, characterized in that: It also comprises four roller bearings (9), and two of the rotating shafts of the two middle rollers (8) are rotatably mounted in the four sliding blocks (6) through the four roller bearings (9) respectively.

3. A middle roll stand for a cold rolling mill as claimed in claim 2, characterized in that: It also includes an axial end sleeve (10), a threaded rod (11), a slide rail (12), a threaded slider (13) and a push cylinder (14). Four threaded rods (19) are respectively installed in the four sliders (6). The axial end sleeve (10) is slidably inserted into the inner rings of the four roller bearings (9). The rotating shaft of the middle roller (8) is concentrically pressed into the axial end sleeve (10). The outer ends of the plurality of axial end sleeves (10) are concentrically provided with threaded rods (11). The threaded rods (11) located on the front archway (1) and the threaded rods (11) located on the rear archway (2) are The threads of the threaded rod (11) are rotated in opposite directions. The left and right parts of the four sliders (6) are provided with slide rails (12). The threaded sliders (13) are slidably installed on the multiple slide rails (12). The opposite surfaces of the two threaded sliders (13) located on the same slider (6) are provided with semicircular grooves matching the threads of the threaded rod (11). The inner walls of the semicircular grooves are provided with internal threads matching the threads of the threaded rod (11). Two of the multiple push cylinders (14) are respectively connected to the two threaded sliders (13) located on the same slider (6).

4. A middle roll stand for a cold rolling mill as claimed in claim 3, characterized in that: The inner ring of the roller bearing (9) is provided with a multi-deformation socket, the outer wall of the shaft end sleeve (10) is provided with a polygon, and the multi-deformation of the shaft end sleeve (10) matches the multi-deformation socket of the roller bearing (9).

5. A middle roll stand for a cold rolling mill as claimed in claim 3, characterized in that: It also includes end rods (15) and protrusions (16), the outer ends of the two shaft end sleeves (10) located on the front archway (1) are concentrically provided with end rods (15), the outer ends of the plurality of end rods (15) are concentrically provided with protrusions (16), and the edges of the protrusions (16) protrude outside the end rods (15).

6. A middle roll stand for a cold rolling mill as claimed in claim 5, characterized in that: The invention also comprises a cross beam (17), two clamping plates (18), two screw rods (19) and two push cylinders (20). A slide groove is arranged in the middle of the cross beam (17). The two clamping plates (18) are symmetrically slidably mounted on both sides of the slide groove of the cross beam (17). One end of the two screw rods (19) are respectively rotatably connected to the two clamping plates (18). The other ends of the two screw rods (19) are respectively rotatably screwed to both sides of the cross beam (17). The fixed ends of the two push cylinders (20) are respectively mounted on both ends of the cross beam (17).

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