Roller lower elevation adjusting structure

Abstract

The invention provides a roller lower elevation adjusting structure which comprises a roller changing trolley, a pressure head assembly is arranged on the roller changing trolley, the pressure head assembly comprises an upper pressure equalizing pad and a pressure sensor, and the pressure sensor is installed between the upper pressure equalizing pad and the roller changing trolley; the transition base plate is fixedly connected with the bearing seat of the lower roll system; the adjusting base plate is located between the transition base plate and the upper pressure equalizing pad; the arc-shaped base plate is located between the adjusting base plate and the upper pressure equalizing pad, and the end face, close to the upper pressure equalizing pad, of the arc-shaped base plate is an arc-shaped face. Compared with a traditional structure for adjusting the elevation of a lower roll system on a roll changing trolley, the device has the beneficial effects that by replacing an adjusting base plate on the lower roll system, operation is more convenient, the labor intensity of workers is reduced, the roll changing downtime is greatly shortened, the production efficiency of a rolling line is improved, and the pressure head assembly can detect rolling force data in real time; the function range of the lower elevation adjusting device is expanded, and the automation level of a rolling line is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of rolling mills, and in particular relates to a roller lower elevation adjustment structure. Background Art

[0002] The hot strip mill is the main equipment on the hot strip production line, used for directly rolling strip steel. Its performance directly affects the efficiency of the production line and product quality. The lower elevation adjustment device is an important part of the hot strip mill, used to adjust the roll surface elevation when the roll diameter of the lower roll system changes.

[0003] In the lower elevation adjustment device in the prior art, the lower roll is directly placed on the roll changing trolley. When the roll diameter of the roll regrinding changes, it is necessary to replace the adjustment pad on the roll changing trolley when the roll changing is stopped, which will greatly extend the roll changing downtime and affect the production efficiency of the production line. In addition, replacing the adjustment pad on the production line is highly dangerous and labor-intensive for workers. The roll changing trolley is an integral structure, which is difficult to manufacture and is easily deformed during use. There is no rolling force detection device on the roll changing trolley, and the rolling force data cannot be fed back during the production process. Summary of the invention

[0004] In view of this, the present invention aims to provide a roller lower elevation adjustment structure, in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A roller lower elevation adjustment structure, comprising:

[0007] A roller changing trolley, wherein the roller changing trolley is provided with a pressure head assembly, wherein the pressure head assembly comprises an upper pressure equalizing pad and a pressure sensor, wherein the pressure sensor is installed between the upper pressure equalizing pad and the roller changing trolley;

[0008] A transition pad, the transition pad is fixedly connected to the bearing seat of the lower roller system;

[0009] An adjusting pad, wherein the adjusting pad is located between the transition pad and the upper pressure equalizing pad;

[0010] An arc-shaped pad, wherein the arc-shaped pad is located between the adjusting pad and the upper pressure-equalizing pad, and the end surface of the arc-shaped pad adjacent to the upper pressure-equalizing pad is an arc-shaped surface.

[0011] Furthermore, there are multiple types of adjusting pads, and different types of adjusting pads have different thicknesses, which are suitable for adjusting different lower elevations of the rollers;

[0012] There are two roll-changing trolleys, which correspond to the bearing seats on the operating side and the transmission side respectively. The two roll-changing trolleys are connected by a pull rod, and both ends of the pull rod are hinged to the two roll-changing trolleys through hinge shafts respectively, and the axis of the hinge shaft is arranged perpendicular to the axis of the rolling roller.

[0013] Furthermore, the pressure head assembly also includes a pressure head frame and a lower equalizing pressure pad. The pressure head frame is fixedly connected to the roller changing trolley. The lower equalizing pressure pad, upper equalizing pressure pad and pressure sensor are all installed on the inner side of the pressure head frame. The pressure sensor is located between the lower equalizing pressure pad and the upper equalizing pressure pad. The upper equalizing pressure pad is connected to the pressure head frame by a pre-tightening bolt.

[0014] Furthermore, a pre-tightening threaded hole is provided on the pressure head frame, a through hole corresponding to the pre-tightening threaded hole is provided on the upper pressure equalizing pad, a groove corresponding to the through hole is provided on the upper end surface of the upper pressure equalizing pad, the pre-tightening bolt passes through the through hole and is threadedly connected to the pressure head frame, and the head of the pre-tightening bolt is located on the inner side of the groove.

[0015] Further, a disc spring is provided between the head of the pre-tightening bolt and the bottom end of the groove, a positioning sleeve is provided on the outside of the pre-tightening bolt, the inner diameter of the positioning sleeve matches the outer diameter of the pre-tightening bolt, the outer diameter of the positioning sleeve matches the inner diameter of the disc spring, and the disc spring is installed on the outside of the positioning sleeve;

[0016] A gasket is fixedly arranged on the outer side of the upper end of the positioning sleeve, and the gasket is located between the head of the pre-tightening bolt and the disc spring.

[0017] Further, a mounting groove is formed at the lower end of the bearing seat, a first threaded hole is formed at the bottom end of the mounting groove, a first connecting hole corresponding to the first threaded hole is formed on the transition pad, a first bolt is provided in the first connecting hole, and the first bolt passes through the first connecting hole and is threadedly connected to the inner side of the first threaded hole;

[0018] A second threaded hole is formed on the transition pad, a mounting hole corresponding to the second threaded hole is formed on the adjustment plate, a diameter of the mounting hole is larger than a diameter of the second threaded hole, a second connecting hole corresponding to the second threaded hole is formed on the arc-shaped pad, a second bolt is provided in the second connecting hole, and the second bolt passes through the second connecting hole and is threadedly connected to the inner side of the second threaded hole.

[0019] Furthermore, a receiving groove corresponding to the second threaded hole is formed at the bottom end of the installation groove, and a portion of the second bolt protruding from the upper end surface of the transition pad is located on the inner side of the receiving groove.

[0020] Furthermore, a protective cover is fixedly provided at the lower end of the bearing seat, and the pressure head assembly is located inside the protective cover;

[0021] The protective cover is a cylindrical structure surrounded by a plurality of side baffles.

[0022] Furthermore, there is a gap between the outer side of the pressure head assembly and the inner side of the protective cover.

[0023] Furthermore, a protective plate corresponding to the protective cover is fixedly provided on the bearing seat, the upper end of the protective plate is fixedly connected to the bearing seat, and the lower end of the protective plate is inclined in a direction away from the bearing seat.

[0024] Compared with the prior art, the roller lower elevation adjustment structure described in the present invention has the following beneficial effects:

[0025] Compared with the traditional structure of adjusting the elevation of the lower roll system on the roll changing trolley, the lower elevation adjustment structure of the rolling mill described in the present invention is more convenient to operate and reduces the labor intensity of workers, greatly shortens the roll changing downtime, and improves the production efficiency of the rolling line. The pressure head assembly can detect the rolling force data in real time, expands the functional scope of the lower elevation adjustment device, and improves the automation level of the rolling line. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the front view structure of the roller lower elevation adjustment structure according to an embodiment of the present invention;

[0028] Figure 2 For the embodiment of the present invention Figure 1 Schematic diagram of the cross-sectional structure at AA;

[0029] Figure 3 This is a schematic diagram of the structure of the roller changing trolley from above according to an embodiment of the present invention;

[0030] Figure 4 For the embodiment of the present invention Figure 1 Schematic diagram of the structure at B in the middle;

[0031] Figure 5 For the embodiment of the present invention Figure 4 Schematic diagram of the structure at point C in the middle.

[0032] Description of reference numerals:

[0033] 1. Roll-changing trolley; 2. Pressure head assembly; 3. Lower roller system; 4. Arc pad; 5. Transition pad; 6. Adjustment pad; 7. Side baffle; 8. Protective plate; 9. First bolt; 10. Second bolt; 11. Operation side car body; 12. Transmission side car body; 13. Pull rod; 21. Pressure head frame; 22. Pressure sensor; 23. Lower equalizing pad; 24. Upper equalizing pad; 25. Positioning sleeve; 26. Disc spring; 27. Pre-tightening bolt; 31. Mounting slot; 32. Storage slot; 33. Roller; 51. Second threaded hole. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0038] like Figures 1 to 5 As shown, a structure for adjusting the lower elevation of a roller 33 includes:

[0039] A roller changing trolley 1, wherein the roller changing trolley 1 is provided with a pressure head assembly 2, wherein the pressure head assembly 2 comprises an upper pressure equalizing pad 24 and a pressure sensor 22, wherein the pressure sensor 22 is installed between the upper pressure equalizing pad 24 and the roller changing trolley 1;

[0040] A transition pad 5, wherein the transition pad 5 is fixedly connected to the bearing seat of the lower roller system 3;

[0041] An adjusting pad, the adjusting pad being located between the transition pad 5 and the upper pressure equalizing pad 24;

[0042] The arc-shaped pad 4 is located between the adjusting pad and the upper pressure-equalizing pad 24 , and the end surface of the arc-shaped pad 4 adjacent to the upper pressure-equalizing pad 24 is an arc-shaped surface.

[0043] There are many types of adjusting pads, and different types of adjusting pads have different thicknesses, which are suitable for adjusting different lower elevations of the rollers 33;

[0044] There are two roll changing trolleys 1, and the two roll changing trolleys 1 correspond to the bearing seats on the operating side and the transmission side respectively. The two roll changing trolleys 1 (respectively the operating side car body 11 and the transmission side car body 12) are connected by a pull rod 13, and the two ends of the pull rod 13 are respectively hinged to the two roll changing trolleys 1 through a hinge shaft, and the axis of the hinge shaft is arranged perpendicular to the axis of the roller 33.

[0045] The pressure head assembly 2 also includes a pressure head frame 21 and a lower pressure equalizing pad 23. The pressure head frame 21 is fixedly connected to the roller changing trolley 1. The lower pressure equalizing pad 23, the upper pressure equalizing pad 24 and the pressure sensor 22 are all installed on the inner side of the pressure head frame 21. The pressure sensor 22 is located between the lower pressure equalizing pad 23 and the upper pressure equalizing pad 24. The upper pressure equalizing pad 24 is connected to the pressure head frame 21 by a pre-tightening bolt 27.

[0046] The pressure head frame 21 is provided with a pre-tightening threaded hole, the upper pressure equalizing pad 24 is provided with a through hole corresponding to the pre-tightening threaded hole, the upper end surface of the upper pressure equalizing pad 24 is provided with a groove corresponding to the through hole, the pre-tightening bolt 27 passes through the through hole and is threadedly connected to the pressure head frame 21, and the head of the pre-tightening bolt 27 is located on the inner side of the groove. A disc spring 26 is provided between the head of the pre-tightening bolt 27 and the bottom end of the groove, a positioning sleeve 25 is provided on the outer side of the pre-tightening bolt 27, the inner diameter of the positioning sleeve 25 matches the outer diameter of the pre-tightening bolt 27, the outer diameter of the positioning sleeve 25 matches the inner diameter of the disc spring 26, and the disc spring 26 is installed on the outer side of the positioning sleeve 25; a gasket is fixed on the outer side of the upper end of the positioning sleeve 25, and the gasket is located between the head of the pre-tightening bolt 27 and the disc spring 26. When the pre-tightening bolt 27 is tightened, the disc spring 26 is compressed, and the elastic force generated by the disc spring 26 is applied to the upper pressure equalizing pad 24, so that the upper pressure equalizing pad 24 presses the pressure sensor 22 in turn, so that the pressure sensor 22 maintains a stable position during operation, and prevents the gap between the joint surfaces from entering impurities, affecting the flatness of the upper and lower surfaces of the pressure sensor 22 and thus affecting the detection accuracy. The positioning sleeve 25 is used to ensure that the compression of each disc spring 26 is consistent, so that the pre-tightening force of the pressure sensor 22 is balanced.

[0047] The lower end of the bearing seat is provided with a mounting groove 31, the bottom end of the mounting groove 31 is provided with a first threaded hole, the transition pad 5 is provided with a first connection hole corresponding to the first threaded hole, the first connection hole is provided with a first bolt 9, the first bolt 9 penetrates the first connection hole and is threadedly connected to the inner side of the first threaded hole; the transition pad 5 is provided with a second threaded hole 51, the adjustment plate is provided with a mounting hole corresponding to the second threaded hole 51, the diameter of the mounting hole is larger than the diameter of the second threaded hole 51, the arc pad 4 is provided with a second connection hole corresponding to the second threaded hole 51, the second connection hole is provided with a second bolt 10, the second bolt 10 penetrates the second connection hole and is threadedly connected to the inner side of the second threaded hole 51. The bottom end of the mounting groove 31 is provided with a receiving groove 32 corresponding to the second threaded hole 51, the part of the second bolt 10 protruding from the upper end surface of the transition pad 5 is located on the inner side of the receiving groove 32. After loosening the second bolt 10, the model of the adjustment pad can be replaced, and multiple adjustment pads can also be used together, which broadens the scope of application.

[0048] A protective cover is fixedly provided at the lower end of the bearing seat, and the pressure head assembly 2 is located inside the protective cover; the protective cover is a cylindrical structure formed by a plurality of side baffles 7. There is a gap between the outer side of the pressure head assembly 2 and the inner side of the protective cover. The protective cover can ensure that the lower roller system 3 falls smoothly on the roller changing trolley 1, and prevent the lower roller system 3 and the roller changing trolley 1 from having a large relative movement, thereby improving the stability during use.

[0049] The bearing seat is fixedly provided with a protective plate 8 corresponding to the protective cover, the upper end of the protective plate 8 is fixedly connected to the bearing seat, and the lower end of the protective plate 8 is inclined away from the bearing seat. The protective plate 8 prevents steel rolling cooling water and other impurities from entering the interior of the pressure head assembly 2, thereby ensuring the measurement accuracy of the pressure sensor 22 and extending its service life.

[0050] Working process:

[0051] When this solution is implemented, the arc-shaped pad 4 is in direct contact with the pressure head assembly 2 of the roll-changing trolley 1 to support the lower roll system 3. When the diameter of the roll 33 changes after a period of use, it is necessary to replace the adjustment pad 6 of different thicknesses to compensate for the change in roll surface height caused by the change in roll diameter of the roll 33, so that the roll surface elevation is within a reasonable range. This part of the adjustment work is carried out offline and does not occupy the production line roll changing downtime.

[0052] The following is an example of a method for adjusting the lower elevation of a roller 33 of the present invention:

[0053] The initial diameter Dmax of the roller 33 is φ1000mm, the minimum allowable diameter Dmin is φ900mm, the nominal elevation of the roller surface is +800mm, and the tolerance of the roller surface elevation is ±5mm. Three adjustment pads 6 are configured at each arc pad, and the thickness of the adjustment pad 61 is 10mm, the thickness of the adjustment pad 62 is 20mm, and the thickness of the adjustment pad 63 is 30mm.

[0054] When the diameter D of the roller 33 is the initial diameter φ1000mm, the roller surface elevation is the nominal elevation +800mm. At this time, there is no need to add the adjustment pad 6. When the roller diameter changes after the roller 33 is reground, the thickness of the adjustment pad 6 is determined according to the actual size of the roller 33 diameter D.

[0055] When 1000mm≧D≧990mm, the thickness of the pad 6 is adjusted to 0mm, that is, the pad 6 does not need to be adjusted;

[0056] When 990mm>D≧970mm, the thickness of the adjustment pad 6 is 10mm, and the adjustment pad 6- is selected;

[0057] When 970mm>D≧950mm, the thickness of the adjustment pad 6 is 20mm, and the adjustment pad 62 is selected;

[0058] When 950mm>D≧930mm, the thickness of the adjustment pad 6 is 30mm, and the adjustment pad 63 is selected;

[0059] When 930mm>D≧910mm, the thickness of the adjustment pad 6 is 40mm, and the adjustment pad 61 and the adjustment pad 63 are used in combination;

[0060] When 910mm>D≧900mm, the thickness of the adjustment pad 6 is 50mm, and the adjustment pad 62 and the adjustment pad 63 are used in combination;

[0061] During steel rolling, the lower roll system 3 is placed on the roll changing trolley 1. The pressure head assembly 2 installed on the operating side car body 11 and the transmission side car body 12 of the roll changing trolley 1 supports the arc pad 4 of the lower roll system 3 and prevents the lower roll system 3 from moving. The pressure sensor 22 in the pressure head assembly 2 detects the rolling force transmitted by the lower roll system 3 in real time and feeds it back to the rolling line automation system to optimize the rolling process parameters.

[0062] When changing rolls, after the roll 33 has been used for a period of time, the roll changing trolley 1 is pushed and pulled by the hydraulic cylinder to drag the lower roll system 3 out of the rolling mill frame, lift the old roll system, replace it with a new roll system, and then push the roll changing trolley 1 to load the new lower roll system 3 into the rolling mill frame. The new roll system has adjusted the lower roll surface elevation according to the diameter of the roll 33 in the roll 33 preparation workshop using an adjustment pad 6 of appropriate thickness.

[0063] Compared with the traditional structure of adjusting the elevation of the lower roll system 3 on the roll changing trolley 1, by replacing the adjusting pad on the lower roll system 3, the operation is more convenient and the labor intensity of workers is reduced, the roll changing downtime is greatly shortened, and the rolling line production efficiency is improved. In addition, the pressure head assembly 2 can detect the rolling force data in real time, which expands the functional scope of the lower elevation adjustment device and improves the automation level of the rolling line.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A roller lower elevation adjustment structure, characterized in that: include: A roll-changing trolley (1), wherein the roll-changing trolley (1) is provided with a pressure head assembly (2), wherein the pressure head assembly (2) comprises an upper pressure equalizing pad (24) and a pressure sensor (22), wherein the pressure sensor (22) is installed between the upper pressure equalizing pad (24) and the roll-changing trolley (1); A transition pad (5), wherein the transition pad (5) is fixedly connected to the bearing seat of the lower roller system (3); An adjusting pad, the adjusting pad being located between the transition pad (5) and the upper pressure equalizing pad (24); An arc-shaped pad (4), wherein the arc-shaped pad (4) is located between the adjustment pad and the upper pressure-equalizing pad (24), and the end surface of the arc-shaped pad (4) adjacent to the upper pressure-equalizing pad (24) is an arc-shaped surface.

2. The roller lower elevation adjustment structure according to claim 1, characterized in that: There are various types of adjusting pads, and the thickness of adjusting pads of different types is different, which are suitable for adjusting the lower elevation of different rollers (33); There are two roll-changing trolleys (1), which correspond to the bearing seats on the operating side and the transmission side respectively. The two roll-changing trolleys (1) are connected by a pull rod (13), and the two ends of the pull rod (13) are respectively hinged to the two roll-changing trolleys (1) through an articulated shaft, and the axis of the articulated shaft is arranged perpendicular to the axis of the rolling roller (33).

3. The roller lower elevation adjustment structure according to claim 1, characterized in that: The pressure head assembly (2) also includes a pressure head frame (21) and a lower pressure equalizing pad (23); the pressure head frame (21) is fixedly connected to the roller changing trolley (1); the lower pressure equalizing pad (23), the upper pressure equalizing pad (24) and the pressure sensor (22) are all installed on the inner side of the pressure head frame (21); the pressure sensor (22) is located between the lower pressure equalizing pad (23) and the upper pressure equalizing pad (24); and the upper pressure equalizing pad (24) is connected to the pressure head frame (21) via a pre-tightening bolt (27).

4. The roller lower elevation adjustment structure according to claim 3 is characterized in that: The pressure head frame (21) is provided with a pre-tightening threaded hole, the upper pressure equalizing pad (24) is provided with a through hole corresponding to the pre-tightening threaded hole, the upper end surface of the upper pressure equalizing pad (24) is provided with a groove corresponding to the through hole, the pre-tightening bolt (27) passes through the through hole and is threadedly connected to the pressure head frame (21), and the head of the pre-tightening bolt (27) is located on the inner side of the groove.

5. The roller lower elevation adjustment structure according to claim 4 is characterized in that: A disc spring (26) is provided between the head of the pre-tightening bolt (27) and the bottom end of the groove, a positioning sleeve (25) is provided on the outside of the pre-tightening bolt (27), the inner diameter of the positioning sleeve (25) matches the outer diameter of the pre-tightening bolt (27), the outer diameter of the positioning sleeve (25) matches the inner diameter of the disc spring (26), and the disc spring (26) is installed on the outside of the positioning sleeve (25); A gasket is fixedly provided on the outer side of the upper end of the positioning sleeve (25), and the gasket is located between the head of the pre-tightening bolt (27) and the disc spring (26).

6. The roller lower elevation adjustment structure according to claim 2, characterized in that: The lower end of the bearing seat is provided with a mounting groove (31), the bottom end of the mounting groove (31) is provided with a first threaded hole, the transition pad (5) is provided with a first connecting hole corresponding to the first threaded hole, a first bolt (9) is provided in the first connecting hole, and the first bolt (9) passes through the first connecting hole and is threadedly connected to the inner side of the first threaded hole; The transition pad (5) is provided with a second threaded hole (51), the adjustment plate is provided with a mounting hole corresponding to the second threaded hole (51), the diameter of the mounting hole is larger than the diameter of the second threaded hole (51), the arc pad (4) is provided with a second connecting hole corresponding to the second threaded hole (51), a second bolt (10) is provided in the second connecting hole, and the second bolt (10) passes through the second connecting hole and is threadedly connected to the inner side of the second threaded hole (51).

7. A roller lower elevation adjustment structure according to claim 6, characterized in that: A receiving groove (32) corresponding to the second threaded hole (51) is formed at the bottom end of the installation groove (31), and the portion of the second bolt (10) protruding from the upper end surface of the transition pad (5) is located on the inner side of the receiving groove (32).

8. The roller lower elevation adjustment structure according to claim 6, characterized in that: A protective cover is fixedly provided at the lower end of the bearing seat, and the pressure head assembly (2) is located inside the protective cover; The protective cover is a cylindrical structure formed by enclosing a plurality of side baffles (7).

9. A roller lower elevation adjustment structure according to claim 8, characterized in that: There is a gap between the outer side of the pressure head assembly (2) and the inner side of the protective cover.

10. The roller lower elevation adjustment structure according to claim 8, characterized in that: A protective plate (8) corresponding to the protective cover is fixedly arranged on the bearing seat, the upper end of the protective plate (8) is fixedly connected to the bearing seat, and the lower end of the protective plate (8) is inclined in a direction away from the bearing seat.

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