Hot rolling device for stainless steel coiled plate

By designing a stainless steel coil hot rolling device containing a cleaning mechanism and an adjustment mechanism, the problem that the cleaning device in the prior art cannot be applied to steel coils of different thicknesses is solved, and the effect of efficient cleaning and rapid adjustment is achieved, and the scope of application is expanded.

CN222642827UActive Publication Date: 2025-03-21WUHAN PINGAN WEIYE CONSTR ENG CO LTD
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Patent Information

Application Number
CN202421150765.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-24
Publication Date
2025-03-21
Estimated Expiration
2034-05-24

AI Technical Summary

Technical Problem

The existing stainless steel coil cleaning devices lack adjustment devices and cannot be used for steel coils of different thicknesses, which reduces the scope of application.

Method used

A stainless steel coil hot rolling device is designed, including a mounting shell, a slide chute, a cleaning mechanism and an adjustment mechanism. The cleaning mechanism is cleaned through the No. 1 and No. 2 roller shafts and motor-driven cleaning rollers; the adjustment mechanism is achieved quickly adjusting the distance between the roller shafts through a bidirectional threaded rod and a motor-driven transmission belt.

Benefits of technology

It realizes efficient cleaning of steel coils of different thicknesses and rapid adjustment of roller shaft distance, expands the scope of application of the device, and improves the flexibility and efficiency of operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of stainless steel coiled plate processing, in particular to a stainless steel coiled plate hot rolling device, which aims at solving the cleaning problem and comprises a mounting shell, first sliding grooves are formed in the outer surfaces of the two sides of the mounting shell; a cleaning mechanism is slidably mounted on the outer surface of the first sliding groove. The upper surface of the mounting shell is fixedly connected with an adjusting mechanism; second sliding grooves are formed in the outer surfaces of the two sides of the mounting shell. Through the arrangement of the cleaning mechanism, the steel coil plate is cleaned, and dust is prevented from being attached to the outer surface of the steel coil plate; and through the arrangement of the adjusting mechanism, the distance between the first roller shaft and the second roller shaft is rapidly adjusted, and the device can be suitable for steel coil plates with different thicknesses.
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Description

Technical Field

[0001] The utility model relates to the technical field of stainless steel coil processing, in particular to a stainless steel coil hot rolling device. Background Art

[0002] Hot rolling is relative to cold rolling. Cold rolling is rolling carried out below the recrystallization temperature, while hot rolling is rolling carried out above the recrystallization temperature. Simply put, a piece of steel billet is heated and then rolled through several passes, then trimmed and corrected into a steel plate. This is called hot rolling, which can significantly reduce energy consumption and costs. During hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduces the energy consumption of metal deformation.

[0003] However, the prior art still has shortcomings. In the prior art, the steel coil needs to be cleaned, but the existing cleaning device lacks an adjustment device and cannot be applied to steel coils of different thicknesses, which reduces the scope of application.

[0004] Therefore, we propose a stainless steel coil hot rolling device to solve this problem. Utility Model Content

[0005] The utility model aims to solve the problems raised in the above background technology and proposes a stainless steel coil hot rolling device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A stainless steel coil hot rolling device comprises a mounting shell; a No. 1 slide groove is provided on both outer surfaces of the mounting shell; a cleaning mechanism is slidably mounted on the outer surface of the No. 1 slide groove; an adjustment mechanism is fixedly connected to the upper surface of the mounting shell; and a No. 2 slide groove is provided on both outer surfaces of the mounting shell.

[0008] Preferably, the cleaning mechanism includes a No. 1 roller and a No. 2 roller slidably mounted on the inner surface of the No. 1 slide groove; a No. 1 slider is rotatably mounted on one end of the No. 1 roller; a No. 3 slider is rotatably mounted on the other end of the No. 1 roller; a No. 2 slider is slidably mounted on one end of the No. 2 roller; a No. 4 slider is rotatably mounted on the other end of the No. 2 roller; a No. 1 motor is fixedly connected to the outer surface of one side of the No. 1 slider; a No. 2 motor is fixedly connected to the outer surface of one side of the No. 4 slider; a cleaning roller is connected to the outer cylindrical surface sleeve of the No. 1 roller; a cleaning roller is connected to the outer cylindrical surface sleeve of the No. 2 roller.

[0009] Preferably, the adjusting mechanism comprises a No. 1 mounting block fixedly connected to the outer surface of one side of the mounting shell and a No. 2 mounting block fixedly connected to the outer surface of the other side of the mounting shell; a No. 1 rotating block is rotatably installed on one side of the lower surface of the No. 1 mounting block; a No. 2 rotating block is rotatably installed on the other side of the lower surface of the No. 1 mounting block; a No. 1 two-way threaded rod is fixedly connected to the lower surface of the No. 1 rotating block; a No. 2 two-way threaded rod is fixedly connected to the lower surface of the No. 2 rotating block; a No. 3 rotating block is rotatably installed on one side of the lower surface of the No. 2 mounting block; a No. 4 rotating block is rotatably installed on the other side of the lower surface of the No. 2 mounting block; the No. 3 rotating block is fixedly connected to the No. 3 two-way threaded rod; the No. 4 rotating block is fixedly connected to the lower surface of the No. 2 mounting block; the No. 3 rotating block is fixedly connected to the No. 3 two-way threaded rod; the No. 4 rotating block is fixedly connected to the No. 4 two-way threaded rod; the outer cylindrical surface sleeve of the No. 1 rotating block is connected to a No. 1 transmission belt; the outer cylindrical surface sleeve of the No. 3 rotating block is connected to a No. 2 transmission belt; the upper surface of the No. 1 mounting block is fixedly connected to a No. 3 motor; the upper surface of the No. 2 mounting block is fixedly connected to a No. 4 motor.

[0010] Preferably, the output end of the No. 1 motor is fixedly connected to one end of the No. 1 roller shaft; the output end of the No. 2 motor is fixedly connected to one end of the No. 2 roller shaft; one side outer surface of the No. 1 slider is slidably mounted on the inner surface of the No. 2 slide groove; one side outer surface of the No. 2 slider is slidably mounted on the inner surface of the No. 2 slide groove; one side outer surface of the No. 3 slider is slidably mounted on the inner surface of the No. 2 slide groove; one side outer surface of the No. 4 slider is slidably mounted on the inner surface of the No. 2 slide groove.

[0011] Preferably, one end of the No. 1 transmission belt is sleeved on the outer circumferential surface of the No. 2 rotating block; one end of the No. 2 transmission belt is sleeved on the outer circumferential surface of the No. 4 rotating block; the output end of the No. 3 motor is fixedly connected to one end of the No. 1 bidirectional threaded rod; the output end of the No. 4 motor is fixedly connected to one end of the No. 4 bidirectional threaded rod.

[0012] Preferably, the outer cylindrical surface of the No. 1 bidirectional threaded rod is rotatably mounted on the inner surface of the No. 1 slider; the outer cylindrical surface of the No. 1 bidirectional threaded rod is rotatably mounted on the inner surface of the No. 2 slider; the outer cylindrical surface of the No. 2 bidirectional threaded rod is rotatably mounted on the inner surface of the No. 1 slider; the outer cylindrical surface of the No. 2 bidirectional threaded rod is rotatably mounted on the inner surface of the No. 2 slider; the outer cylindrical surface of the No. 3 bidirectional threaded rod is rotatably mounted on the inner surface of the No. 3 slider; the outer cylindrical surface of the No. 3 bidirectional threaded rod is rotatably mounted on the inner surface of the No. 4 slider; the outer cylindrical surface of the No. 4 bidirectional threaded rod is rotatably mounted on the inner surface of the No. 3 slider; the outer cylindrical surface of the No. 4 bidirectional threaded rod is rotatably mounted on the inner surface of the No. 4 slider.

[0013] In the utility model, the stainless steel coil hot rolling device is provided with a No. 1 slider, a No. 2 slider, a No. 1 roller, a No. 1 motor, a No. 3 slider, a No. 4 slider, a No. 2 roller, and a No. 2 motor. By starting the No. 1 motor and the No. 2 motor, the No. 1 motor drives the No. 1 roller to rotate, the No. 2 motor drives the No. 2 roller to rotate, and the rotation of the No. 1 roller and the No. 2 roller drives the cleaning roller to rotate, so that the cleaning roller cleans the steel coil, thereby cleaning the steel coil and preventing dust from adhering to the outer surface of the steel coil.

[0014] In the utility model, a stainless steel coil hot rolling device is described, through the arrangement of a No. 1 mounting block, a No. 1 rotating block, a No. 2 rotating block, a No. 1 transmission belt, a No. 1 bidirectional threaded rod, a No. 2 bidirectional threaded rod, a No. 3 motor, a No. 2 mounting block, a No. 3 rotating block, a No. 4 rotating block, a No. 2 transmission belt, a No. 3 bidirectional threaded rod, a No. 4 bidirectional threaded rod, and a No. 4 motor, when the distance between the No. 1 roller shaft and the No. 2 roller shaft is adjusted, the No. 3 motor and the No. 4 motor are started, and the No. 3 motor drives the No. 1 rotating block to rotate, and the rotation of the No. 1 rotating block drives the No. 2 rotating block to rotate through the No. 1 transmission belt, and the rotation of the No. 1 rotating block and the No. 2 rotating block drives the No. 1 bidirectional threaded rod. The rod and the No. 2 bidirectional threaded rod rotate, the rotation of the No. 1 bidirectional threaded rod and the No. 2 bidirectional threaded rod drives the No. 1 slider and the No. 2 slider to move, the No. 4 motor drives the No. 3 rotating block to rotate, the rotation of the No. 3 rotating block drives the No. 4 rotating block to rotate through the No. 2 transmission belt, the rotation of the No. 3 rotating block and the No. 4 rotating block drives the No. 3 bidirectional threaded rod and the No. 4 bidirectional threaded rod to rotate, the rotation of the No. 3 bidirectional threaded rod and the No. 4 bidirectional threaded rod drives the No. 3 slider and the No. 4 slider to move, thereby driving the distance between the No. 1 roller and the No. 2 roller, realizing the rapid adjustment of the distance between the No. 1 roller and the No. 2 roller, which can be suitable for steel coils of different thicknesses;

[0015] The utility model has reasonable structural design, simple operation and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a stainless steel coil hot rolling device proposed by the utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the cleaning mechanism of the utility model;

[0018] Figure 3 for Figure 1 A partial enlarged view of part A.

[0019] In the figure: 1. mounting shell; 2. No. 1 slide; 3. cleaning mechanism; 31. No. 1 slider; 32. No. 2 slider; 33. No. 1 roller; 34. No. 1 motor; 35. No. 3 slider; 36. No. 4 slider; 37. No. 2 roller; 38. No. 2 motor; 4. adjusting mechanism; 41. No. 1 mounting block; 411. No. 1 rotating block; 412. No. 2 rotating block; 413. No. 1 transmission belt; 414. No. 1 two-way threaded rod; 415. No. 2 two-way threaded rod; 416. No. 3 motor; 42. No. 2 mounting block; 421. No. 3 rotating block; 422. No. 4 rotating block; 423. No. 2 transmission belt; 424. No. 3 two-way threaded rod; 425. No. 4 two-way threaded rod; 426. No. 4 motor; 5. No. 2 slide; 6. cleaning roller. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-3 A stainless steel coil hot rolling device comprises a mounting shell 1; a No. 1 slide groove 2 is provided on both sides of the outer surface of the mounting shell 1; a cleaning mechanism 3 is slidably installed on the outer surface of the No. 1 slide groove 2; an adjusting mechanism 4 is fixedly connected to the upper surface of the mounting shell 1; and a No. 2 slide groove 5 is provided on both sides of the outer surface of the mounting shell 1.

[0022] Furthermore, the cleaning mechanism 3 includes a No. 1 roller 33 and a No. 2 roller 37 slidably mounted on the inner surface of the No. 1 slide groove 2; a No. 1 slider 31 is rotatably mounted on one end of the No. 1 roller 33; a No. 3 slider 35 is rotatably mounted on the other end of the No. 1 roller 33; a No. 2 slider 32 is slidably mounted on one end of the No. 2 roller 37; a No. 4 slider 36 is rotatably mounted on the other end of the No. 2 roller 37; a No. 1 motor 34 is fixedly connected to the outer surface of one side of the No. 1 slider 31; a No. 2 motor 38 is fixedly connected to the outer surface of one side of the No. 4 slider 36; a cleaning roller 6 is connected to the outer cylindrical surface sleeve of the No. 1 roller 33; and a cleaning roller 6 is connected to the outer cylindrical surface sleeve of the No. 2 roller 37.

[0023] Further, the adjustment mechanism 4 includes a No. 1 mounting block 41 fixedly connected to the outer surface of one side of the mounting shell 1 and a No. 2 mounting block 42 fixedly connected to the outer surface of the other side of the mounting shell 1; a No. 1 rotating block 411 is rotatably mounted on one side of the lower surface of the No. 1 mounting block 41; a No. 2 rotating block 412 is rotatably mounted on the other side of the lower surface of the No. 1 mounting block 41; a No. 1 bidirectional threaded rod 414 is fixedly connected to the lower surface of the No. 1 rotating block 411; a No. 2 bidirectional threaded rod 415 is fixedly connected to the lower surface of the No. 2 rotating block 412; a No. 2 bidirectional threaded rod 416 is fixedly connected to the lower surface of the No. 2 mounting block 42; a No. 1 rotating block 411 is rotatably mounted on one side of the lower surface of the No. 2 mounting block There is a No. 3 rotating block 421; a No. 4 rotating block 422 is rotatably installed on the other side of the lower surface of the No. 2 mounting block 42; a No. 3 bidirectional threaded rod 424 is fixedly connected to the lower surface of the No. 3 rotating block 421; a No. 4 bidirectional threaded rod 425 is fixedly connected to the lower surface of the No. 4 rotating block 422; a No. 1 transmission belt 413 is connected to the outer cylindrical surface sleeve of the No. 1 rotating block 411; a No. 2 transmission belt 423 is connected to the outer cylindrical surface sleeve of the No. 3 rotating block 421; a No. 3 motor 416 is fixedly connected to the upper surface of the No. 1 mounting block 41; a No. 4 motor 426 is fixedly connected to the upper surface of the No. 2 mounting block 42.

[0024] Furthermore, the output end of the No. 1 motor 34 is fixedly connected to one end of the No. 1 roller shaft 33; the output end of the No. 2 motor 38 is fixedly connected to one end of the No. 2 roller shaft 37; the outer surface of one side of the No. 1 slider 31 is slidably mounted on the inner surface of the No. 2 slide groove 5; the outer surface of one side of the No. 2 slider 32 is slidably mounted on the inner surface of the No. 2 slide groove 5; the outer surface of one side of the No. 3 slider 35 is slidably mounted on the inner surface of the No. 2 slide groove 5; the outer surface of one side of the No. 4 slider 36 is slidably mounted on the inner surface of the No. 2 slide groove 5.

[0025] Furthermore, one end of the No. 1 transmission belt 413 is sleeved on the outer cylindrical surface of the No. 2 rotating block 412; one end of the No. 2 transmission belt 423 is sleeved on the outer cylindrical surface of the No. 4 rotating block 422; the output end of the No. 3 motor 416 is fixedly connected to one end of the No. 1 bidirectional threaded rod 414; the output end of the No. 4 motor 426 is fixedly connected to one end of the No. 4 bidirectional threaded rod 425.

[0026] Further, the outer cylindrical surface of the No. 1 bidirectional threaded rod 414 is rotatably mounted on the inner surface of the No. 1 slider 31; the outer cylindrical surface of the No. 1 bidirectional threaded rod 414 is rotatably mounted on the inner surface of the No. 2 slider 32; the outer cylindrical surface of the No. 2 bidirectional threaded rod 415 is rotatably mounted on the inner surface of the No. 1 slider 31; the outer cylindrical surface of the No. 2 bidirectional threaded rod 415 is rotatably mounted on the inner surface of the No. 2 slider 32; the outer cylindrical surface of the No. 3 bidirectional threaded rod 424 is rotatably mounted on the inner surface of the No. 3 slider 35; the outer cylindrical surface of the No. 3 bidirectional threaded rod 424 is rotatably mounted on the inner surface of the No. 4 slider 36; the outer cylindrical surface of the No. 4 bidirectional threaded rod 425 is rotatably mounted on the inner surface of the No. 3 slider 35; the outer cylindrical surface of the No. 4 bidirectional threaded rod 425 is rotatably mounted on the inner surface of the No. 4 slider 36.

[0027] In the utility model, when in use, by starting the No. 1 motor 34 and the No. 2 motor 38, the No. 1 motor 34 will drive the No. 1 roller 33 to rotate, the No. 2 motor 38 will drive the No. 2 roller 37 to rotate, the rotation of the No. 1 roller 33 and the No. 2 roller 37 will drive the cleaning roller 6 to rotate, so that the cleaning roller 6 cleans the steel coil, and the steel coil is cleaned to prevent dust from adhering to the outer surface of the steel coil; when the distance between the No. 1 roller 33 and the No. 2 roller 37 is adjusted, the No. 3 motor 416 and the No. 4 motor 426 are started, the No. 3 motor 416 will drive the No. 1 rotating block 411 to rotate, the rotation of the No. 1 rotating block 411 drives the No. 2 rotating block 412 to rotate through the No. 1 transmission belt 413, and the rotation of the No. 1 rotating block 411 and the No. 2 rotating block 412 drives the No. 1 bidirectional threaded rod 41 4 and No. 2 bidirectional threaded rods 415 rotate, the rotation of the No. 1 bidirectional threaded rod 414 and the No. 2 bidirectional threaded rod 415 drives the No. 1 slider 31 and the No. 2 slider 32 to move, the No. 4 motor 426 drives the No. 3 rotating block 421 to rotate, the rotation of the No. 3 rotating block 421 drives the No. 4 rotating block 422 to rotate through the No. 2 transmission belt 423, the rotation of the No. 3 rotating block 421 and the No. 4 rotating block 422 drives the No. 3 bidirectional threaded rod 424 and the No. 4 bidirectional threaded rod 425 to rotate, the rotation of the No. 3 bidirectional threaded rod 424 and the No. 4 bidirectional threaded rod 425 drives the No. 3 slider 35 and the No. 4 slider 36 to move, thereby driving the distance between the No. 1 roller 33 and the No. 2 roller 37, realizing the rapid adjustment of the distance between the No. 1 roller 33 and the No. 2 roller 37, which can be suitable for steel coils of different thicknesses.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A stainless steel coil hot rolling device, characterized in that: The invention comprises a mounting shell (1); the outer surfaces of both sides of the mounting shell (1) are provided with a first slide groove (2); the outer surface of the first slide groove (2) is slidably mounted with a cleaning mechanism (3); the upper surface of the mounting shell (1) is fixedly connected with an adjustment mechanism (4); the outer surfaces of both sides of the mounting shell (1) are provided with a second slide groove (5).

2. A stainless steel coil hot rolling device according to claim 1, characterized in that: The cleaning mechanism (3) comprises a No. 1 roller (33) and a No. 2 roller (37) slidably mounted on the inner surface of the No. 1 slide groove (2); a No. 1 slider (31) is rotatably mounted on one end of the No. 1 roller (33); a No. 3 slider (35) is rotatably mounted on the other end of the No. 1 roller (33); a No. 2 slider (32) is slidably mounted on one end of the No. 2 roller (37); a No. 4 slider (36) is rotatably mounted on the other end of the No. 2 roller (37); a No. 1 motor (34) is fixedly connected to the outer surface of one side of the No. 1 slider (31); a No. 2 motor (38) is fixedly connected to the outer surface of one side of the No. 4 slider (36); a cleaning roller (6) is connected to the outer cylindrical surface of the No. 1 roller (33); and a cleaning roller (6) is connected to the outer cylindrical surface of the No. 2 roller (37).

3. The stainless steel coil hot rolling device according to claim 1, characterized in that: The adjustment mechanism (4) comprises a first mounting block (41) fixedly connected to the outer surface of one side of the mounting shell (1) and a second mounting block (42) fixedly connected to the outer surface of the other side of the mounting shell (1); a first rotating block (411) is rotatably mounted on one side of the lower surface of the first mounting block (41); a second rotating block (412) is rotatably mounted on the other side of the lower surface of the first mounting block (41); a first bidirectional threaded rod (414) is fixedly connected to the lower surface of the first rotating block (411); a second bidirectional threaded rod (415) is fixedly connected to the lower surface of the second rotating block (412); a third rotating block is rotatably mounted on one side of the lower surface of the second mounting block (42). (421); a fourth rotating block (422) is rotatably mounted on the other side of the lower surface of the second mounting block (42); a third bidirectional threaded rod (424) is fixedly connected to the lower surface of the third rotating block (421); a fourth bidirectional threaded rod (425) is fixedly connected to the lower surface of the fourth rotating block (422); a first transmission belt (413) is connected to the outer circumferential surface sleeve of the first rotating block (411); a second transmission belt (423) is connected to the outer circumferential surface sleeve of the third rotating block (421); a third motor (416) is fixedly connected to the upper surface of the first mounting block (41); a fourth motor (426) is fixedly connected to the upper surface of the second mounting block (42).

4. A stainless steel coil hot rolling device according to claim 2, characterized in that: The output end of the No. 1 motor (34) is fixedly connected to one end of the No. 1 roller shaft (33); the output end of the No. 2 motor (38) is fixedly connected to one end of the No. 2 roller shaft (37); one side outer surface of the No. 1 slider (31) is slidably mounted on the inner surface of the No. 2 slide groove (5); one side outer surface of the No. 2 slider (32) is slidably mounted on the inner surface of the No. 2 slide groove (5); one side outer surface of the No. 3 slider (35) is slidably mounted on the inner surface of the No. 2 slide groove (5); one side outer surface of the No. 4 slider (36) is slidably mounted on the inner surface of the No. 2 slide groove (5).

5. The stainless steel coil hot rolling device according to claim 3, characterized in that: One end of the No. 1 transmission belt (413) is sleeved on the outer circumferential surface of the No. 2 rotating block (412); one end of the No. 2 transmission belt (423) is sleeved on the outer circumferential surface of the No. 4 rotating block (422); the output end of the No. 3 motor (416) is fixedly connected to one end of the No. 1 bidirectional threaded rod (414); the output end of the No. 4 motor (426) is fixedly connected to one end of the No. 4 bidirectional threaded rod (425).

6. The stainless steel coil hot rolling device according to claim 3, characterized in that: The outer circular surface of the No. 1 bidirectional threaded rod (414) is rotatably mounted on the inner surface of the No. 1 slider (31); the outer circular surface of the No. 1 bidirectional threaded rod (414) is rotatably mounted on the inner surface of the No. 2 slider (32); the outer circular surface of the No. 2 bidirectional threaded rod (415) is rotatably mounted on the inner surface of the No. 1 slider (31); the outer circular surface of the No. 2 bidirectional threaded rod (415) is rotatably mounted on the inner surface of the No. 2 slider (32); the outer circular surface of the No. 3 bidirectional threaded rod (424) is rotatably mounted on the inner surface of the No. 3 slider (35); the outer circular surface of the No. 3 bidirectional threaded rod (424) is rotatably mounted on the inner surface of the No. 4 slider (36); the outer circular surface of the No. 4 bidirectional threaded rod (425) is rotatably mounted on the inner surface of the No. 3 slider (35); the outer circular surface of the No. 4 bidirectional threaded rod (425) is rotatably mounted on the inner surface of the No. 4 slider (36).