Method for replacing lower brush roll

Abstract

The invention discloses a lower brush roll replacing method which comprises the four steps of presetting a roll unloading module, hoisting the roll unloading module to the upper end of a bearing seat, unloading a roll and hoisting away the roll unloading module, in the roll unloading process, the preset roll unloading module is hoisted to the upper end of the bearing seat through a flexible sling, and the roll unloading module is hoisted away from the bearing seat; the roller body of the lower brush roller is rigidly supported by the two roller seats on the roller unloading module, so that the roller shaft of the lower brush roller is not deformed during roller unloading, and after the roller shafts at the two ends of the lower brush roller are separated from the sliding seat and the fixed seat, the roller unloading module and the lower brush roller only need to be hoisted away from the upper end of the bearing seat through the flexible sling; the whole roller replacement process is stable and efficient, and the reliability and efficiency of replacement of the lower brush roller are improved.

Description

Technical Field

[0001] The present invention relates to the field of strip grinding, and particularly to a method for replacing a lower brush roll. Background Art

[0002] Steel plates are also called strips. After being manufactured, the strips are rolled up for storage, that is, the common steel coils. The steel coils will enter corresponding product manufacturing processing plants according to different usage requirements and be made into corresponding parts. Between the time when the strip enters the processing plant and when it is cut and processed, the strip will react with moisture and chemical substances in the air, causing the surface material of the strip to peel off or rust. In order to remove the rust layer, usually, the upper and lower opposite upper and lower brush rolls installed in the steel plate grinding and brushing equipment are used to grind the surface of the strip; both the upper and lower brush rolls include a roll body and roll shafts located at both ends of the roll body; during grinding, the two brush rolls come into contact with the surface of the steel plate for grinding. After long-term use, the grinding effect of the brush rolls will also decline, so the brush rolls need to be replaced.

[0003] When replacing the upper brush roll, the roll unloading vehicle can be driven into the grinding and brushing equipment, and the roll unloading process can refer to the roll unloading vehicle patent with the publication number CN110842728; but the lower brush roll usually can only be replaced manually. For example, in the scale removal device with the publication number CN216371592, there are two bearing seats arranged on the bearing seat, one of the two bearing seats is slidable, and the other is fixedly arranged. The two shaft seats can be regarded as a sliding seat and a fixed seat respectively; the roll shafts at both ends of the lower brush roll are respectively clamped into the sliding seat and the fixed seat; when unloading the roll, the bearing seat needs to be moved out of the frame, and then the sliding seat and the fixed seat are respectively disengaged from the roll shafts at both ends of the lower brush roll; when the sliding seat and the fixed seat are disengaged from the lower brush roll, the worker needs to use the flexible sling on the overhead crane to lift the brush roll to keep the lower brush roll stable, but such a roll unloading method has deficiencies.

[0004] The flexible sling is controlled by the worker, and it is difficult to control the magnitude of the lifting force. If the lifting force of the sling on the lower brush roll is insufficient, when the sliding seat disengages from the roll shaft at one end of the lower brush roll, the lower brush roll will tilt towards the sliding seat under the action of gravity, resulting in deformation of the roll shaft stuck in the fixed seat at the other end.

[0005] If the flexible sling applies too large a lifting force to the lower brush roll, although the problem of the lower brush roll tilting can be avoided, this will cause the roll shafts at both ends of the lower brush roll to be stuck with the sliding seat or the fixed seat, making it difficult for the sliding seat and the fixed seat to disengage; therefore, the reliability and efficiency of this roll unloading method are relatively low. Summary of the Invention

[0006] The present invention provides a method for replacing the lower brush roll. By means of a flexible sling, a pre-set roll unloading module is hoisted above the bearing seat, and the roll body of the lower brush roll is rigidly supported by two roll seats on the roll unloading module, so that the roll shaft of the lower brush roll remains undeformed during roll unloading. After the two ends of the roll shaft of the lower brush roll are disengaged from the sliding seat and the fixed seat, it is only necessary to lift the roll unloading module and the lower brush roll from the upper end of the bearing seat by means of the flexible sling; the entire roll replacement process is stable and efficient, improving the reliability and efficiency of replacing the lower brush roll.

[0007] The technical solution of the present invention is realized as follows: A method for replacing the lower brush roll, comprising the following steps: S1: Pre-set a roll unloading module; the roll unloading module includes a frame for hoisting and cooperating with a flexible sling, and two symmetrically arranged roll seats are slidably connected to the lower end of the frame; the roll seat includes two support seats that face each other front and back and extend downward, and a supporting member is connected to the inner side of the support seat; and an avoidance area that is open at the lower end and is used to avoid the roll shaft is formed between the two support seats; S2; Hoist the roll unloading module to the upper end of the bearing seat; the bearing seat is provided with a sliding seat and a fixed seat that respectively clamp the two ends of the lower brush roll. Connect the flexible sling to the frame and lift the entire roll unloading module, then horizontally place the entire roll unloading module at the corresponding position on the upper end of the bearing seat, and make the two avoidance areas respectively correspond to the positions of the roll shafts at both ends of the lower brush roll; S3: Unload the roll; Control the two roll seats to approach each other, and after the two groups of front and back facing supporting members move to a predetermined position to support the roll body of the lower brush roll, then slide the sliding seat in a direction away from the lower brush roll to disengage the roll shaft at one end of the lower brush roll, and then control the two roll seats and the lower brush roll to slide in a direction away from the fixed seat to disengage the roll shaft at the other end of the lower brush roll; S4: Lift off the roll unloading module; Use the flexible sling to lift the entire roll unloading module and the lower brush roll from the upper end of the bearing seat, so as to unload the lower brush roll from the bearing seat.

[0008] Preferably, in step S1, a hoisting and leveling assembly is provided on the frame. The hoisting and leveling assembly includes a first lifting lug and a second lifting lug that face each other horizontally. A single first lifting hole is provided on the first lifting lug, and a plurality of horizontally spaced second lifting holes are provided on the second lifting lug. In step S2, one end of the flexible sling is hoisted in the first lifting hole, and the other end of the flexible sling is hoisted in one of the plurality of second lifting holes to keep the hoisted roll unloading module horizontal.

[0009] Preferably, in step S1, the supporting member is provided with a supporting groove that opens outward. The supporting groove includes a supporting surface for supporting the lower brush roll and a contact surface perpendicular to the supporting surface. In step S3, when the two roller assemblies support the lower brush roll, the left and right contact surfaces respectively abut against the two side end faces of the lower brush roll to prevent the lower brush roll from moving left and right when disengaging from the sliding seat and the fixed seat; ensuring the stable progress of the roll unloading process.

[0010] Preferably, in step S1, a linkage oil cylinder is provided between the two roller seats. The linkage oil cylinder includes a cylinder body respectively connected to the two roller seats and a telescopic rod movable in the cylinder body. In step S3, the piston rod expands and contracts to make the two roller seats approach each other to a predetermined position.

[0011] Preferably, the number of the linkage oil cylinders is two. The roller seat includes a cross plate horizontally and slidably connected to the lower end of the frame 1. Two support seats are located at the lower end of the cross plate. An installation plate is provided between the cross plate and each support seat. In step S3, the piston rod and the cylinder body of each oil cylinder are respectively hinged to two left and right opposite installation plates, so that the front and rear ends of the two roller seats approach each other simultaneously. The hinge design can prevent jamming when the linkage oil cylinder acts.

[0012] Preferably, the two roller seats are connected by a linkage oil cylinder to form a roller seat assembly that can move synchronously. In step S1, a positioning and adjusting assembly is provided between the frame and the roller seat assembly. The positioning and adjusting assembly includes an adjusting rack and an adjusting gear respectively arranged on the frame and the roller seat assembly. A control rod is installed on the adjusting gear, and a control handwheel exposed on the frame is installed at the outer end of the control rod. In step S2, rotate the control handwheel and drive the two roller seats to move synchronously in the left and right directions and stop at the corresponding positions, so that the two roller seats are symmetric about the lower brush roller left and right; to avoid the phenomenon that one end of the roller body of the lower brush roller is supported and the other end is not supported.

[0013] Preferably, the two roller seats are connected by a linkage oil cylinder to form a roller seat assembly that can move synchronously. In step S1, a pushing oil cylinder is provided on the roller seat on the same side as the fixed seat. In step S3, after the sliding seat disengages from the roller shaft at one end of the lower brush roller, the piston rod of the pushing oil cylinder extends and acts on the fixed seat, so that the roller seat assembly and the lower brush roller move away from the fixed seat, so that the fixed seat disengages from the roller shaft at the other end of the lower brush roller.

[0014] Preferably, in step S1, a lifting and adjusting mechanism is further provided on the frame. The lifting and adjusting mechanism includes a driving component and an eccentric adjusting component symmetrically arranged left and right on the frame. The eccentric adjusting component includes a lifting component and a transmission component. The transmission component includes a set of front and rear opposite transmission wheels arranged on the frame. The lifting component includes a lifting member and a set of connecting rods arranged between the lifting member and the two front and rear opposite transmission wheels. The lower end of each connecting rod is hinged to the lifting member, and the upper end of the connecting rod is eccentrically rotationally connected to the corresponding transmission wheel. In step S3, when the two roller seats approach each other to a predetermined position, a preset gap is formed between the supporting member and the roller body of the lower brush roller. At this time, the driving component can drive the two sets of left and right opposite transmission wheels to rotate synchronously by a predetermined angle, so that the two lifting members act on the bearing seat downward and lift the frame to a predetermined height to eliminate the preset gap between the supporting member and the roller body; ensuring that the supporting member forms a support for the roller body.

[0015] Preferably, the driving wheel is a driving gear, the driving assembly includes a driving shaft and two driving gears, and a linkage rod is connected between the two driving gears; the corresponding driving gear meshes with every two front and rear opposite driving gears at the same time; the driving shaft is directly or indirectly connected to one of the driving gears in a transmission manner, and an adjusting handwheel is connected to the outer end of the driving shaft. In step S3, rotate the adjusting handwheel to synchronously rotate the plurality of driving wheels by a predetermined angle and stop at corresponding positions to eliminate the preset gap between the supporting member and the roller body.

[0016] Preferably, a self-locking transmission member is provided between the driving shaft and the corresponding driving gear. The self-locking transmission member is a worm and worm gear transmission box. The driving shaft is connected to the input end of the worm and worm gear transmission box, and the corresponding driving gear is connected to the output end of the worm and worm gear transmission box; in step S3, after the driving gear rotates to the in-place position, the worm and worm gear transmission box restricts the driving gear from rotating reversely, so that the two driving wheels stop at the predetermined positions; preventing the lifting member from retracting upward due to the reverse rotation of the driving wheel.

[0017] Preferably, a rotating shaft hole is provided at the upper end of the connecting rod, and an eccentric assembly is installed in the rotating shaft hole. The eccentric assembly includes a transmission shaft and an eccentric sleeve. An eccentric hole that is not concentric with the rotating shaft hole is provided on the eccentric sleeve. One end of the transmission shaft is connected to the driving wheel in a transmission manner, and the other end of the transmission shaft passes through the eccentric hole and is circumferentially fixed to the eccentric sleeve; in step S3, the driving wheel rotates to drive the lifting member to act downward on the bearing seat; the eccentric sleeve can rely on the rotation of the driving wheel and form an eccentric drive on the connecting rod, without the need to open an eccentric through hole on the driving wheel, ensuring uniform stress distribution of the driving wheel, while driving the lifting member to move downward, reducing the damage probability and maintenance cost of the driving wheel.

[0018] Preferably, the outer end of one of the transmission shafts is connected to a pointer exposed on the frame, and a scale disk corresponding to the position of the pointer is provided on the frame. A plurality of scale values are evenly distributed along the circumference of the scale disk: in step S3, after the transmission shaft rotates by a corresponding angle and stops at the corresponding position, by visually observing the change range of the scale value of the pointer on the scale disk, to confirm that the preset gap between the supporting member and the roller body is eliminated in place; thus facilitating the operator to confirm whether the preset gap is eliminated.

[0019] The beneficial effects of the present invention adopting the above technical solutions are as follows: When unloading the roller, the flexible roller unloading method of the present invention hoists the roller unloading module to the upper end of the bearing seat through a sling, so that the supporting members of the two roller seats on the roller unloading module support the roller body of the lower brush roller in place, so that the roller shafts at both ends of the lower brush roller will not deform when disengaging from the sliding seat and the fixed seat. After the lower brush roller disengages from the sliding seat and the fixed seat, only need to hoist the roller unloading module and the lower brush roller away again through the sling, then the lower brush roller can be unloaded from the bearing seat. This flexible roller unloading method is simple to operate, improving the reliability and efficiency during roller unloading.

[0020] The telescopic linkage between the two roller seats can change the distance between the two roller seats to unload the lower brush roller with different length specifications on the bearing seat; at the same time, the telescopic linkage connects the two roller seats into a roller seat assembly that can slide synchronously, so that when the lower brush roller disengages from the fixed seat, the two roller seats and the lower brush roller can slide synchronously in the direction away from the fixed seat; at the same time, the roller seat assembly that can slide synchronously is also convenient for adjusting the position on the frame, with a clever design and multiple functions achieved with one move.

[0021] Due to the existence of manufacturing and assembly errors, to avoid interference between the supporting member and the roller body of the lower brush roller when the supporting member moves with the roller seat, the distance between two relatively front and rear supporting members is relatively wide, so that a preset gap will be formed between the supporting member and the roller body of the lower brush roller after the supporting member arrives with the roller seat. The present invention can adjust the height position of the frame through the lifting adjustment mechanism after the preset gap is formed, so as to eliminate the preset gap between the supporting member and the roller body and ensure a stable supporting effect of the supporting member on the roller body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the structural diagram of the roll unloading module; Figure 2 is the structural schematic diagram of the roll unloading module from another angle; Figure 3 is the cross-sectional view of two relatively front and rear supporting members holding the roller body of the lower brush roller; Figure 4 is the schematic diagram of the roll unloading module placed at the upper end of the bearing seat; Figure 5 is the schematic diagram of the sliding seat disengaging from one end roller shaft of the lower brush roller after the roller body of the lower brush roller is supported; Figure 6 is the schematic diagram of the pushing cylinder acting and disengaging the roller shaft at the other end of the lower brush roller from the fixed seat; Figure 7 is the structural diagram of the lifting adjustment mechanism after hiding the frame; Figure 8 is the cross-sectional view of the lifting adjustment mechanism; Figure 9 is the enlarged cross-sectional view of the matching position between the upper end of the connecting rod and the transmission shaft; Figure 10 is the enlarged view of the pointer and the dial on the frame; Figure 11 is the structural schematic diagram of the eccentric sleeve; Figure 12 is the structural schematic diagram of the positioning adjustment component; Figure 13 is the structural diagram of two roller seats holding the lower brush roller; Figure 14 is the structural schematic diagram of the roller seat; Figure 15It is a schematic diagram of the principle for replacing the roll module at the upper end of the bearing seat; Figure 16 It is a comparison diagram when the preset gap exists and when the preset gap is eliminated; Figure 17 It is a block diagram of the method steps of the present invention; Each reference numeral is: 1 - frame, 1a - bearing seat, 2 - roll seat, 3 - pushing oil cylinder, 4 - lifting adjustment mechanism, 5 - roll body, 51 - circular boss, 11 - first lifting lug, 12 - second lifting lug, 13 - first lifting hole, 13a - second lifting hole, 14 - sliding seat, 15 - fixed seat, 16 - guiding seat, 17 - guiding wheel, 18 - hydraulic station, 21 - linkage oil cylinder, 22 - supporting member, 23 - control handwheel, 24 - supporting part, 25 - cross plate, 26 - mounting plate, 27 - reinforcing plate, 41 - driving shaft, 42 - worm and worm gear transmission box, 43 - eccentric adjustment assembly, 221 - supporting surface, 222 - limiting surface, 231 - adjusting rack, 232 - adjusting gear, 241 - avoiding groove, 242 - abutting surface, 251 - connecting seat, 252 - rotating shaft sleeve, 261 - fixing plate, 411 - adjusting handwheel, 412 - pointer, 413 - scale disk, 431 - driving gear, 432 - transmission wheel, 432a - transmission shaft, 433 - connecting rod, 434 - lifting member, 435 - guiding plate, 436 - eccentric sleeve, 4361 - eccentric hole, 4362 - retaining ring groove, 4363 - annular groove, 437 - spherical plain bearing, 438 - output shaft, 439 - linkage rod, s - preset gap. Detailed implementation manners

[0023] In order to be able to more clearly understand the above - mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0025] As Figure 1-16 shown, the specific implementation manner of the present invention is as follows: This embodiment provides a method for replacing the lower brush roll, including the following steps: S1: Pre-set the roll unloading module; the roll unloading module includes a frame 1 for hoisting cooperation with a flexible sling. Two symmetrically arranged roller seats 2 are slidably connected to the lower end of the frame 1. The roller seat 2 includes two support seats 24 that face each other front and back and extend downward. A supporting member 22 is connected to the inner side of the support seat 24. A clearance area 241 that is open at the lower end and is used to avoid the roller shaft is formed between the two support seats 24. S2; Hoist the roll unloading module to the upper end of the bearing seat 1a; there are a sliding seat 14 and a fixed seat 15 that respectively clamp the two ends of the lower brush roll on the bearing seat 1a. The sliding seat 14 and the fixed seat 15 are arranged in a box with a single-side opening on the bearing seat 1a. Connect the flexible sling to the frame 1 and lift the entire roll unloading module, then horizontally place the entire roll unloading module at the corresponding position on the upper end of the bearing seat 1a, and make the two clearance areas 241 respectively correspond to the positions of the roller shafts at both ends of the lower brush roll; the corresponding position usually refers to the upper end of the box of the bearing seat 1a. S3: Unload the roll; Control the two roller seats 2 to approach each other, and make the two groups of front and back facing supporting members 22 move to a predetermined position to support the roller body 5 of the lower brush roll. Then make the sliding seat 14 slide in a direction away from the lower brush roll to disengage from the roller shaft at one end of the lower brush roll. Then control the two roller seats 2 and the lower brush roll to slide in a direction away from the fixed seat 15 to disengage the fixed seat 15 from the roller shaft at the other end of the lower brush roll; at this time, the lower brush roll has been disengaged from the sliding seat 14 and the fixed seat 15. S4: Lift off the roll unloading module; Use the flexible sling to lift off the entire roll unloading module and the lower brush roll from the upper end of the bearing seat 1a, so as to unload the lower brush roll from the bearing seat 1a. The entire roll unloading process is simple and efficient, with low operation difficulty, effectively avoiding the problems of roller shaft deformation and low roll unloading efficiency.

[0026] Furthermore, in this embodiment, the sling needs to be first hung on the hook of the crane, and then the two ends of the sling are respectively hung on the frame 1. In order to ensure that the lifted roll unloading module remains horizontal, in step S1, a hoisting leveling assembly is provided on the frame 1. The hoisting leveling assembly includes a first lifting lug 11 and a second lifting lug 12 that are horizontally opposite. A single first lifting hole 13 is provided on the first lifting lug 11, and a plurality of horizontally spaced second lifting holes 13a are provided on the second lifting lug 12. In step S2, one end of the flexible sling is hoisted in the first lifting hole 13, and the other end of the flexible sling is hoisted on one of the plurality of second lifting holes 13a. That is to say, the operator can switch the hoisting end of the sling among the plurality of second lifting holes 13 until the first lifting lug 11 and the second lifting lug 12 are at the same height position to make the lifted roll unloading module remain horizontal.

[0027] Furthermore, to ensure that the roll unloading module is properly placed at the upper end of the bearing seat 1a, a front-back guiding mechanism and a left-right guiding mechanism are provided between the frame 1 and the bearing seat 1a. The front-back guiding mechanism includes an elastic guiding wheel 17 provided on the frame 1 and a guiding block provided on the bearing seat 1a. The left-right guiding mechanism includes a guiding seat 16 provided on the frame 1 and a guiding column provided on the bearing seat 1a. By the cooperation of the elastic guiding wheel 17 and the guiding block, and the cooperation of the guiding seat 16 and the guiding column, the position of the roll unloading module in the hoisting state can be guided, so that it can be stably placed at the corresponding position at the upper end of the bearing seat 1a. The specific structures of the front-back guiding mechanism and the left-right guiding mechanism can refer to the corresponding content in the patent of the idler device with the publication number of CN221821042, which will not be elaborated here.

[0028] Furthermore, the roller body 5 of the lower brush roller includes a roller barrel for arranging brush strips. The outer diameter of the roller barrel is much larger than that of the roller shaft. If the brush strips are not considered, the supporting member 22 can support on the roller barrel. However, to prevent the supporting member 22 from contacting the brush strips on the roller barrel and causing the brush strips to deform, circular bosses 51 for arranging the roller shaft are concentrically installed at both left and right ends of the roller barrel. The outer diameter of the circular boss 51 is smaller than that of the roller barrel. After the two roller seats 2 approach each other to a predetermined position, in this embodiment, the supporting of the roller body 5 by the supporting member 22 means that after the supporting member 22 moves into place along with the roller seat 2, it supports the outer periphery of the circular boss 51, ensuring that the brush strips of the lower brush roller are not deformed by the extrusion of the supporting member 22.

[0029] Furthermore, as Figure 13-14 shown, to ensure the stability of the lower brush roller when it disengages from the sliding seat 14 and the fixed seat 15, in step S1, the supporting member 22 is provided with a supporting groove that opens outward. The supporting groove includes a supporting surface 221 for supporting the lower brush roller and a contact surface 222 perpendicular to the supporting surface 221. To further fit the circular boss 51 of the roller body 5, the supporting surface 221 is an arc surface. In step S3, when the two idler assemblies support the lower brush roller, the contact surfaces 222 on the left and right sides respectively abut against the two end faces of the lower brush roller to prevent the lower brush roller from moving left and right when it disengages from the sliding seat 14 and the fixed seat 15, ensuring the stable progress of the roll unloading process. Here, the two end faces of the lower brush roller refer to the outer end faces of the two circular bosses 51. When the two limiting surfaces 222 are respectively in contact with the outer end faces of the two circular bosses 51, the supporting member 22 can effectively prevent the lower brush roller from moving horizontally and shifting.

[0030] Furthermore, the area of the limiting surface 222 on the supporting member 22 is small, and there are only two supporting members 22 on each roller seat 2. The two limiting surfaces 222 of the two supporting members 22 can only form two limiting points on the outer end surface of the roller body 5. Therefore, in order to increase the stability of the roller body 5, a abutting plate for contacting the end surface of the roller body of the lower brush roller is provided inside the supporting portion 24. The abutting plate is provided with an abutting surface 242, and the abutting surface 242 and the limiting surface 222 are in the same vertical plane, so as to increase the contact area of the roller seat 2 with the end of the roller body 5, form four limiting points on the end of the roller body 5, and keep the roller body 5 axially stable between the two roller seats 2.

[0031] Furthermore, in order to replace the lower brush rollers of different lengths, in step S1, in order to ensure sufficient linkage force on the two roller seats 2, a linkage oil cylinder 21 is provided between the two roller seats 2. The linkage oil cylinder 21 can make the two roller seats 2 move away from each other to replace the lower brush rollers of different lengths. The linkage oil cylinder 21 includes a cylinder body respectively connected to the two roller seats 2 and a telescopic rod moving in the cylinder body. In step S3, the piston rod expands and contracts to make the two roller seats 2 approach each other to a predetermined position; and the number of the linkage oil cylinders 21 is two. The roller seat 2 includes a cross plate 25 slidably connected horizontally to the lower end of the frame 1. Two supporting seats 24 are located at the lower end of the cross plate 25. An installation plate 26 is provided between the cross plate 25 and each supporting seat 24; in step S3, the piston rod and the cylinder body of each oil cylinder 21 are respectively hinged on two left and right opposite installation plates 26, so that the front and rear ends of the two roller seats 2 approach each other simultaneously; and the hinge design can prevent the linkage oil cylinder 21 from jamming when it moves.

[0032] Furthermore, the structure of the roller seat 2 is as follows; the roller seat 2 includes a cross plate 25 slidably connected horizontally to the lower end of the frame 1. Two supporting portions 24 are connected to the lower end of the cross plate 25. An installation plate 26 is provided between the cross plate 25 and each supporting portion 24; the installation plate 26 is not only the carrier for installing the linkage oil cylinder 21, but also plays a strengthening role between the cross plate 25 and the supporting portion 24; at the same time, in this embodiment, the number of the linkage oil cylinders 21 is two. The piston rod and the cylinder body of each linkage oil cylinder 21 are respectively hinged on two left and right opposite installation plates 26, so that the front and rear ends of the roller seat 2 can move synchronously; wherein two connecting ears are provided at the head end position of the piston rod and the tail end position of the cylinder body. The width between the two connecting ears is greater than the thickness of the installation plate 26. In order to ensure that the hinge is in place, a fixing plate 261 is connected to the installation plate 26, and hinge holes are machined on the installation plate 26 and the fixing plate 261 at the same time. The fixing plate 261 can increase the thickness of the installation plate 26 to make up for the gap between the installation plate 26 and the connecting ears, so that after the linkage oil cylinder 21 is hinged in place, the linkage oil cylinder 21 remains stable in the front and rear directions.

[0033] Furthermore, to ensure the structural strength of the roller seat 2, the roller seat 2 is a welded structural member. A support is provided at the lower end of the horizontal plate 25. The middle position of the lower end of the support is recessed inward, thereby forming two support portions 24 and an avoidance groove 241 located between the two support portions 24. To ensure the lightweight of the roller seat 2, the support is a hollow structure, including at least two vertical plates 243 spaced left and right and welded to the lower end of the horizontal plate 25. The middle parts of the lower ends of the two vertical plates 243 are recessed inward, thereby forming two support portions 24 and an avoidance groove 241 located between the two support portions 24. A connecting plate 244 is fixedly installed between every two adjacent vertical plates 243, and the connecting plate 244 and the two vertical plates 243 form the hollow support.

[0034] Furthermore, the linkage oil cylinder 21 is not only a linkage member for the two roller seats 2 to approach or move away from each other, but also a connecting member between the two roller seats 2. The entire roller seat assembly can slide on the frame 1, and the two roller seats 2 are connected by the linkage oil cylinder 21 to form a roller seat assembly that can move synchronously. Specifically, two guide rails are provided on the frame 1 at intervals in the front and rear directions. A corresponding connecting seat 251 is installed at the upper end of the horizontal plate 25 of the roller seat 2. A sliding sleeve is installed on the connecting seat 251, and the sliding sleeve is slidably connected to the corresponding guide rail. To adjust the positions of the two roller seats 2 at any time, so that the two roller seats 2 are symmetric left and right with the lower brush roller as the reference during roll change, and to ensure that the two idler assemblies can support the circular bosses 51 at both ends of the roller barrel at the same time, as Figure 12 shown, in step S1, a positioning and adjusting assembly is provided between the frame 1 and the roller seat assembly. The positioning and adjusting assembly includes an adjusting rack 231 and an adjusting gear 232 respectively provided on the frame 1 and the roller seat assembly. A control rod is installed on the adjusting gear 232. A rotating shaft sleeve 252 is installed on the corresponding roller seat 2. A control rod is installed on the adjusting gear 232. The control rod is located inside the rotating shaft sleeve 252, and both ends of the control rod extend out of the rotating shaft sleeve 252. The inner end of the control rod is connected to the adjusting gear 252, and the outer end of the control rod is installed with a control handwheel 23 exposed on the frame 1. In step S2, rotate the control handwheel 23 and drive the two roller seats 2 to move synchronously in the left and right directions and stop at the corresponding positions, so that the two roller seats 2 are symmetric left and right with the lower brush roller as the reference, to avoid the phenomenon that one end of the roller body 55 is supported and the other end is not supported.

[0035] Furthermore, after the two roller seats 2 are connected by the linkage oil cylinder 21 to form a roller seat assembly that can move synchronously, the lower brush roller is also more stable when disengaging from the fixed seat 15; in step S1, in order to enable the sliding seat 14 to disengage from one end of the lower brush roller, the other end of the lower brush roller can also quickly disengage from the fixed seat 15, and a pushing oil cylinder 3 is provided on the roller seat 2 on the same side as the fixed seat 15; in step S3, after the sliding seat 14 first disengages from the roller shaft at one end of the lower brush roller, the piston rod of the pushing oil cylinder 3 extends and acts on the fixed seat 15, so that the roller seat assembly and the lower brush roller move away from the fixed seat 15, so that the fixed seat 15 disengages from the roller shaft at the other end of the lower brush roller; the pushing oil cylinder 3 does not require manual operation when the lower brush roller disengages from the fixed seat 15, further improving the efficiency of removing the roller.

[0036] Furthermore, in step S1, a lifting and adjusting mechanism 4 is further provided on the frame 1. The lifting and adjusting mechanism 4 includes a driving component and an eccentric adjusting component 43 symmetrically arranged on the left and right of the frame 1. The eccentric adjusting component 43 includes a lifting component and a transmission component. The transmission component includes a set of front and rear opposite transmission wheels 432 arranged on the frame 1. The lifting component includes a lifting member 434 and a set of connecting rods 433 arranged between the lifting member 434 and the two front and rear opposite transmission wheels 432. The lifting member 434 is a vertical plate-like structure. The lower end of each connecting rod 433 is hinged to the lifting member 434, and the upper end of the connecting rod 433 is eccentrically rotatably connected to the corresponding transmission wheel 432; as Figure 16 shown, in the ideal state, after the two front and rear opposite supporting members 22 move in place along with the roller seat 2, the supporting members 22 should be aligned with the roller body 5 and closely adhere to the outer peripheral position of the circular boss 51. However, due to errors, it is difficult to ensure the absolute accuracy of the position of the supporting members 22. Therefore, in order to avoid interference between the supporting members 22 and the roller body 5 of the lower brush roller when the supporting members 22 move, in step S3, when the two roller seats 2 approach each other to a predetermined position, a preset gap s is formed between the supporting members 22 and the roller body 5 of the lower brush roller; this preset gap s can prevent the supporting members 22 from colliding and interfering with the circular boss 51 after moving in place; however, the reserved preset gap s will make it difficult for the supporting members 22 to contact the circular boss 51 on the roller body 5. Therefore, it is necessary to rely on the lifting and adjusting mechanism 4 to eliminate the preset gap s. Specifically, at this time, the driving component can drive the two sets of left and right opposite transmission wheels 432 to rotate synchronously by a predetermined angle, so that the two lifting members 434 act on the bearing seat 1a downward and lift the frame 1 to a predetermined height to eliminate the preset gap s between the supporting members 22 and the roller body 5; the driving component can drive the lifting member 434 to act on the bearing seat 1a through the eccentric adjusting component, thereby forming an upward reaction force on the frame 1 and lifting the frame 1 by a predetermined height. The predetermined height is greater than the size of the preset gap s. After eliminating the preset gap s, the supporting members 22 can closely adhere to the outer periphery of the circular boss 51 and form a support for the roller body 5.

[0037] Furthermore, to make the lifting member 434 move downward more stably and smoothly, a lifting guiding assembly is provided between the frame 1 and the lifting member 434. The lifting guiding assembly includes two front and rear opposing guiding blocks provided on the frame 1, and guiding plates 435 provided at the front and rear ends of the lifting member 434. The guiding plates 435 are made of plastic. The two guiding blocks form a guiding groove, and the two guiding plates 435 are in contact with the corresponding inner walls of the guiding groove and can move up and down to guide the lifting member 434 during movement.

[0038] Furthermore, the driving assembly needs to satisfy the requirement of simultaneously driving two sets of front and rear opposing transmission wheels 432 in the two eccentric adjustment assemblies to rotate simultaneously. To meet this requirement, the transmission wheels 432 in this embodiment are transmission gears. The driving assembly includes a driving shaft 41 and two driving gears 431. A linkage rod 439 is connected between the two driving gears 431. The corresponding driving gears 431 are simultaneously meshed with every two front and rear opposing transmission gears. The driving shaft 41 is directly or indirectly connected to one of the driving gears 431 in a transmission manner. An adjustment handwheel 411 is connected to the outer end of the driving shaft 41. In step S3, the adjustment handwheel 411 is rotated to synchronously rotate the plurality of transmission wheels 432 by a predetermined angle and stop at corresponding positions to eliminate the preset gap s between the supporting member 22 and the roller body 5.

[0039] Furthermore, in an ideal state, the driving shaft 41 can be directly connected to one of the driving gears 431. However, to prevent the preset gap s from reappearing due to the accidental upward reset of the lifting member 434, in this embodiment, the driving shaft 41 acts indirectly on one of the driving gears 431. Specifically, a self-locking transmission member is provided between the driving shaft 41 and the corresponding driving gear 431. The self-locking transmission member is a worm and worm gear transmission box 42. The worm and worm gear transmission box 42 has an input end and an output end. An output shaft 438 is provided at the output end position. The driving shaft 41 is connected to the input end of the worm and worm gear transmission box 42, and the corresponding driving gear 431 is connected to the output shaft 438 of the worm and worm gear transmission box 42. Inside the worm and worm gear transmission box 42, there are a worm and a worm gear in transmission connection. Its specific structure is similar to that in a worm and worm gear reducer and belongs to the prior art, so it will not be elaborated here. The driving shaft 41 is connected to the input end of the worm and worm gear transmission box 42, and the corresponding driving gear 431 is connected to the output end of the worm and worm gear transmission box 42. In step S3, after the driving gear 431 rotates to the in-place position, due to the self-locking characteristic of the worm and worm gear, the worm and worm gear transmission box 42 restricts the reverse rotation of the driving gear 431, causing the two transmission wheels 432 to stop at the predetermined positions; preventing the upward retraction of the lifting member 434 caused by the reverse rotation of the transmission wheels 432.

[0040] Furthermore, a common structure for the driving wheel 432 and the connecting rod 433 to form a driving connection should be to open an eccentric through-hole on the driving wheel 432, and then hinge the connecting rod 433 at the position of the eccentric through-hole through a rotating shaft. However, this structure will cause uneven stress distribution on the entire driving wheel 432, and long-term use will affect the structural strength and service life of the driving wheel 432. Therefore, in this embodiment, to reduce the maintenance cost, the structure of the eccentric rotational connection is improved. The upper end of the connecting rod 433 is provided with a rotating shaft hole, and an eccentric component is installed in the rotating shaft hole. The eccentric component includes a transmission shaft 432a and an eccentric sleeve 436. The eccentric sleeve 436 is made of metal or plastic. An eccentric hole 4361 that is not concentric with the rotating shaft hole is provided on the eccentric sleeve 436. One end of the transmission shaft 432a is in driving connection with the driving wheel 432, and the other end of the transmission shaft 432a passes through the eccentric hole 4361 and is circumferentially fixed to the eccentric sleeve 436; in step S3, the driving wheel 432 rotates to drive the lifting member 434 to act downward on the carrier 1a; the eccentric sleeve 436 can rely on the rotation of the driving wheel 432 to form an eccentric drive on the connecting rod 433, without the need to open an eccentric through-hole on the driving wheel 432, ensuring uniform stress distribution on the driving wheel 432, while driving the lifting member 434 to move downward, reducing the damage probability and maintenance cost of the driving wheel 432.

[0041] Furthermore, an eccentricity is formed between the center of the eccentric hole 4361 and the center of the rotating shaft hole. Considering the change in the outer diameter of the roller body 51 of the lower brush roller of different specifications, the range of the eccentricity in this embodiment is 3 mm - 12 mm; to facilitate determining whether the preset gap s is eliminated in place, the size of the eccentricity in this embodiment is equal to half of the predetermined height; and the predetermined angle for the synchronous rotation of multiple driving wheels 432 is 180 degrees; in the initial state, the center of the rotating shaft hole is directly above the center of the center hole 432b; when multiple driving wheels 432 rotate synchronously by 180 degrees, the center of the rotating shaft hole moves to directly below the center of the center hole 432b, and the center of the rotating shaft hole moves a distance of twice the eccentricity in the vertical direction, which is the same as the size of the predetermined height and also the same as the width of the preset gap s; for example, when the width of the preset gap s is 10 mm and the size of the eccentricity is 5 mm, then in the initial state, the center of the rotating shaft hole of the connecting rod 433 is located at the uppermost end of the center hole. At this time, controlling the driving wheel 432 to rotate 180°, the preset gap s can be eliminated in place.

[0042] Furthermore, the design can also ensure that the roller shaft of the lower brush roller will not deform. Specifically, when the preset gap s is eliminated, the supporting surface 221 of the supporting member 22 has contacted the circular boss 51 of the roller body 5. However, if the eccentricity is greater than the width of the preset gap s, when the worker accidentally exceeds the predetermined angle when rotating the control handwheel 41, an upward acting force will be formed on the roller body 5, resulting in the deformation of the roller shaft stuck in the sliding seat 14 and the fixed seat 15. For example, when the width of the preset gap s is 10 mm and the eccentricity is also 10 mm, only by rotating the entire transmission wheel 432 by 90° can the preset gap s be eliminated. When the operator accidentally exceeds the rotation angle of the transmission wheel 432 by more than 90°, the lifting member 434 will continue to move downward and press against the bearing seat 1a, causing slight deformation of the roller shaft and affecting the service life of the lower brush roller. However, this situation will not occur with the eccentricity in this embodiment. In this embodiment, when the preset gap s is eliminated in place, the center of the rotating shaft hole is already at the lowest position of the center of the center hole. When the synchronous rotation angle of multiple transmission wheels 432 is greater than 180 degrees, the center of the rotating shaft hole rotates around the center of the center hole 432b and approaches the initial position, driving the two already downward extended lifting members 434 to reset upward. Even if the rotation angle of the transmission wheel 432 is accidentally exceeded by more than 180°, it will not cause excessive acting force of the supporting member 22 on the roller body 5, ensuring the structural strength and service life of the lower brush roller.

[0043] Furthermore, for the convenience of the operator to confirm whether the preset gap s is eliminated, as Figure 10 shown, the outer end of one of the transmission shafts 432a is connected with a pointer 412 exposed on the frame 1, and a scale disk 413 corresponding to the position of the pointer 412 is provided on the frame 1. A plurality of scale values are evenly distributed along the circumferential direction on the scale disk 413: The scale values are usually angular values. For example, when the width of the preset gap s is 10 mm and the eccentricity is 5 mm, angular values of 0 - 180° can be set on the scale disk 413. In step S3, after the transmission shaft 432a rotates by a corresponding angle and stops at the corresponding position, by visually observing the change range of the scale value of the pointer 412 on the scale disk 413, that is, visually observing whether the pointer 412 rotates by 180°, it is confirmed that the preset gap s between the supporting member 22 and the roller body 5 is eliminated in place.

[0044] Furthermore, a key connection is provided between the eccentric hole 4361 and the transmission shaft 432a, and between the center hole and the transmission shaft 432a, so that both the transmission wheel 432 and the eccentric sleeve are circumferentially fixed to the transmission shaft 432a; the key connection can be a flat key connection or a spline connection.

[0045] Furthermore, as Figure 9As shown, in an ideal state, the transmission shaft 432a always maintains a concentric state with the eccentric hole 4361 when rotating. However, due to manufacturing and installation errors, a slight relative displacement will be generated in the lateral direction with the eccentric hole 4361 when the transmission shaft 432a rotates, which is the so-called misalignment phenomenon. In order to prevent the misalignment phenomenon from generating a lateral force on the connecting rod 433 and affecting the smooth movement of the connecting rod 433, a spherical bearing 437 is installed in the rotating shaft hole, and the spherical bearing 437 is sleeved on the outer wall of the eccentric sleeve 436; the contact surface between the inner ring and the outer ring of the spherical bearing 437 is spherical, and its inner ring is sleeved on the outer wall of the eccentric sleeve 436. While ensuring the smooth rotation of the transmission shaft 432a in the circumferential direction, the connecting rod 433 is allowed to swing relative to the transmission shaft 432a in the lateral direction to avoid excessive lateral force on the connecting rod 433.

[0046] Furthermore, end covers are provided at both ends of the shaft hole of the connecting rod 433 to seal the shaft hole, thereby ensuring that the components in the shaft hole are isolated from the outside world. At the same time, the end covers can also limit the movement of the joint bearing 437. Specifically, two retaining ring grooves 4362 corresponding to the positions of the two ends of the joint bearing 437 are provided on the outer wall of the eccentric sleeve 436. Retaining rings are provided in the retaining ring grooves 4362. The two retaining rings are respectively held by two end covers to limit the axial movement of the joint bearing 437.

[0047] Furthermore, the position where the eccentric sleeve 436 sets the joint bearing 437 also has an annular groove 4363, which can contain lubricant to make the rotation of the transmission shaft 432a smoother, and can also serve as an installation mark so that the joint bearing 437 can be quickly installed in place.

[0048] Further, if Figure 6-7 As shown, the linkage cylinder 21 and the push cylinder 3 need hydraulic oil to drive when working, so the frame 1 in this embodiment is a frame structure, and a hydraulic station 18 connected to the linkage cylinder 21 and the push cylinder 3 through hydraulic oil pipes is provided in the frame structure; the hydraulic station 18 can output hydraulic oil to drive the linkage cylinder 21 and the push cylinder 3 to move, and the hydraulic station 18 is an existing hydraulic component, and its specific principle is no longer repeated; wherein the frame structure has a plurality of connected windows on the surrounding side walls and the upper and lower end surfaces, and the windows on the upper end surface and the surrounding side walls are connected and sealed by a cover plate, and the hydraulic oil pipe can be inserted from the lower end window close to the linkage cylinder 21 and the push cylinder 3 and connected to the hydraulic station 18.

[0049] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A method for replacing a lower brush roll, characterized in that, It includes the following steps: S1: Preset the roll unloading module; the roll unloading module includes a frame (1) for hoisting cooperation with a flexible sling, and two symmetrically arranged roller seats (2) are slidably connected to the lower end of the frame (1); the roller seat (2) includes two support seats (24) that face each other front and back and extend downward, and a supporting member (22) is connected to the inner side of the support seats (24); and an avoidance area (241) that is open at the lower end and is used to avoid the roller shaft is formed between the two support seats (24); S2; Hoist the roll unloading module to the upper end of the bearing seat (1a); there are a sliding seat (14) and a fixed seat (15) that respectively clamp the two ends of the lower brush roll on the bearing seat (1a). Connect the flexible sling to the frame (1) and lift the entire roll unloading module, then horizontally place the entire roll unloading module at the corresponding position on the upper end of the bearing seat (1a), and make the two avoidance areas (241) respectively correspond to the positions of the roller shafts at both ends of the lower brush roll; S3: Unload the roll; control the two roller seats (2) to approach each other, and make the two groups of front and back facing supporting members (22) move to a predetermined position to support the roller body (5) of the lower brush roll. Then make the sliding seat (14) slide in a direction away from the lower brush roll and disengage from the roller shaft at one end of the lower brush roll, and then control the two roller seats (2) and the lower brush roll to slide in a direction away from the fixed seat (15) to disengage the fixed seat (15) from the roller shaft at the other end of the lower brush roll; S4: Lift off the roll unloading module; Use the flexible sling to lift off the entire roll unloading module and the lower brush roll from the upper end of the bearing seat (1a), so as to unload the lower brush roll from the bearing seat (1a).

2. The method for replacing the lower brush roll according to claim 1, wherein: In step S1, a hoisting and leveling assembly is provided on the frame (1). The hoisting and leveling assembly includes a first lifting lug (11) and a second lifting lug (12) that are horizontally opposite. A single first lifting hole (13) is provided on the first lifting lug (11), and a plurality of horizontally spaced second lifting holes (13a) are provided on the second lifting lug (12). In step S2, one end of the flexible sling is hoisted in the first lifting hole (13), and the other end of the flexible sling is hoisted on one of the plurality of second lifting holes (13a) to keep the hoisted roll unloading module horizontal.

3. A method for replacing a lower brush roll according to claim 1, characterized in that: In step S1, an outwardly open supporting groove is provided on the supporting member (22). The supporting groove includes a supporting surface (221) for supporting the lower brush roll and a contact surface (222) perpendicular to the supporting surface (221). In step S3, when the two roller support assemblies support the lower brush roll, the left and right contact surfaces (222) respectively abut against the two end faces of the lower brush roll to prevent the lower brush roll from moving left and right when disengaging from the sliding seat (14) and the fixed seat (15).

4. A method for replacing the lower brush roll according to claim 1, characterized in that: In step S1, a linkage oil cylinder (21) is provided between the two roller seats (2). The linkage oil cylinder (21) includes a cylinder body respectively connected to the two roller seats (2) and a telescopic rod that moves in the cylinder body. In step S3, the piston rod expands and contracts to make the two roller seats (2) approach each other to a predetermined position.

5. A method for replacing the lower brush roll according to claim 4, characterized in that: The number of the linkage cylinders (21) is two. The roller seat (2) includes a cross plate (25) horizontally and slidably connected to the lower end of the frame (1). Two support seats (24) are located at the lower end of the cross plate (25). An installation plate (26) is provided between the cross plate (25) and each support seat (24). In step S3, the piston rod and the cylinder block of each cylinder (21) are respectively hinged on two left-right opposite installation plates (26), so that the front and rear ends of the two roller seats (2) approach each other simultaneously.

6. A method for replacing the lower brush roll according to claim 1, characterized in that: The two roller seats (2) are connected by the linkage cylinders (21) to form a roller seat assembly capable of synchronous movement. In step S1, a positioning and adjusting assembly is provided between the frame (1) and the roller seat assembly. The positioning and adjusting assembly includes an adjusting rack (231) and an adjusting gear (232) respectively arranged on the frame (1) and the roller seat assembly. A control rod is installed on the adjusting gear (232), and a control handwheel (23) exposed outside the frame (1) is installed at the outer end of the control rod. In step S2, the control handwheel (23) is rotated to drive the two roller seats (2) to move synchronously in the left-right direction and stop at the corresponding positions, so that the two roller seats (2) are symmetric about the lower brush roller left and right.

7. A method for replacing the lower brush roll according to claim 1, characterized in that: The two roller seats (2) are connected by the linkage cylinders (21) to form a roller seat assembly capable of synchronous movement. In step S1, a pushing cylinder (3) is provided on the roller seat (2) on the same side as the fixed seat (15). In step S3, after the sliding seat (14) disengages from the roller shaft at one end of the lower brush roller, the piston rod of the pushing cylinder (3) extends and acts on the fixed seat (15), so that the roller seat assembly and the lower brush roller move away from the fixed seat (15), so that the fixed seat (15) disengages from the roller shaft at the other end of the lower brush roller.

8. A method for replacing a lower brush roll according to claim 1, characterized in that: In step S1, a lifting and adjusting mechanism (4) is further provided on the frame (1). The lifting and adjusting mechanism (4) includes a driving component and an eccentric adjusting component (43) symmetrically arranged left and right on the frame (1). The eccentric adjusting component (43) includes a lifting component and a transmission component. The transmission component includes a set of front and rear opposite transmission wheels (432) arranged on the frame (1). The lifting component includes a lifting member (434) and a set of connecting rods (433) arranged between the lifting member (434) and the two front and rear opposite transmission wheels (432). The lower end of each connecting rod (433) is hinged on the lifting member (434), and the upper end of the connecting rod (433) is eccentrically rotationally connected to the corresponding transmission wheel (432). In step S3, when the two roller seats (2) approach each other to a predetermined position, a preset gap (s) is formed between the supporting member (22) and the roller body (5) of the lower brush roller. At this time, the driving component can drive the two sets of left and right opposite transmission wheels (432) to rotate synchronously by a predetermined angle, so that the two lifting members (434) act downward on the bearing seat (1a) and then lift the frame (1) to a predetermined height to eliminate the preset gap (s) between the supporting member (22) and the roller body (5).

9. A method for replacing the lower brush roll according to claim 8, characterized in that: The driving wheel (432) is a driving gear. The driving assembly includes a driving shaft (41) and two driving gears (431). A linkage rod (439) is connected between the two driving gears (431); the corresponding driving gear (431) meshes with every two front and rear opposite driving gears simultaneously; the driving shaft (41) is directly or indirectly connected to one of the driving gears (431) in a transmission manner. An adjusting handwheel (411) is connected to the outer end of the driving shaft (41). In step S3, the adjusting handwheel (411) is rotated to synchronously rotate the plurality of driving wheels (432) by a predetermined angle and stop at the corresponding positions to eliminate the preset gap (s) between the supporting member (22) and the roller body (5).

10. A method for replacing the lower brush roll according to claim 9, characterized in that: A self-locking transmission member is provided between the driving shaft (41) and the corresponding driving gear (431). The self-locking transmission member is a worm and worm gear transmission box (42). The driving shaft (41) is connected to the input end of the worm and worm gear transmission box (42), and the corresponding driving gear (431) is connected to the output end of the worm and worm gear transmission box (42); in step S3, after the driving gear (431) rotates in place, the worm and worm gear transmission box (42) restricts the reverse rotation of the driving gear (431) to make the two driving wheels (432) stop at the predetermined positions.

11. A method for replacing the lower brush roll according to claim 8, characterized in that: A rotating shaft hole is provided at the upper end of the connecting rod (433). An eccentric component is installed in the rotating shaft hole. The eccentric component includes a transmission shaft (432a) and an eccentric sleeve (436). An eccentric hole (4361) that is not concentric with the rotating shaft hole is provided on the eccentric sleeve (436). One end of the transmission shaft (432a) is connected to the driving wheel (432) in a transmission manner, and the other end of the transmission shaft (432a) passes through the eccentric hole (4361) and is circumferentially fixed to the eccentric sleeve (436); in step S3, the driving wheel (432) rotates to drive the lifting member (434) to act downward on the bearing seat (1a).

12. A method for replacing a lower brush roll according to claim 11, characterized in that: A pointer (412) exposed on the frame (1) is connected to the outer end of one of the transmission shafts (432a). A scale disk (413) corresponding to the position of the pointer (412) is provided on the frame (1). A plurality of scale values are evenly distributed along the circumference of the scale disk (413): in step S3, after the transmission shaft (432a) rotates by a corresponding angle and stops at the corresponding position, by visually observing the change range of the scale value of the pointer (412) on the scale disk (413), it is confirmed that the preset gap (s) between the supporting member (22) and the roller body (5) is eliminated in place.

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