Lower brush roll replacing device and application

Abstract

The lower brush roller replacing device comprises a rack, a carrier roller area is arranged at the lower end of the rack, two roller seats which are in bilateral symmetry are arranged in the carrier roller area, and the roller seats are slidably connected to the rack in the left-right direction; the roller seat comprises two supporting parts which are opposite front and back and extend downwards, an avoiding groove which is provided with an open lower end and used for avoiding the roller shaft is formed between the two supporting parts, and bearing blocks used for bearing the lower brush roller are arranged on the inner sides of the supporting parts; the two bearing blocks opposite to each other in the front-back direction on each roller seat form a carrier roller assembly; the carrier roller area comprises a bearing area used for corresponding to a roller body of the lower brush roller and buffering areas located on the left side and the right side of the bearing area. The device is placed above the bearing seat, the two carrier roller assemblies are moved to the bearing area from the buffering area so as to bear the roller body of the lower brush roller, when the sliding seat and the fixed seat are separated from the lower brush roller, it is guaranteed that roller shafts at the two ends of the lower brush roller cannot deform, the replacement difficulty of the lower brush roller is lowered, and the replacement efficiency of the lower brush roller is improved.

Description

Technical Field

[0001] The present invention relates to the field of strip grinding, and particularly to a lower brush roll replacement device and its application. Background Art

[0002] Steel plates are also called strip steel. After being manufactured, the strip steel will be rolled up for storage, that is, the common steel coil. The steel coil will enter the corresponding product manufacturing processing factory according to different usage requirements and be made into corresponding parts. During the period from when the strip steel enters the processing factory to when it is cut and processed, the strip steel will react with moisture and chemical substances in the air, causing the surface material of the strip steel to peel off or rust. In order to remove the rust layer, usually, the upper and lower opposite upper brush roll and lower brush roll installed in the steel plate grinding and brushing equipment are used to grind the surface of the strip steel; both the upper brush roll and the lower brush roll 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 the brush rolls are used for a long time, the grinding effect will also decline, so the brush rolls need to be replaced.

[0003] When replacing the upper brush roll, the roll-changing cart can be driven into the grinding and brushing equipment. For example, in the roll-changing cart patent with the publication number CN110842728, a bearing seat one and a bearing seat two are installed at the lower end of the working main beam in the steel plate grinding and brushing equipment, and the descaling roll is installed between the two bearing seats; the working main beam and the two bearing seats can be regarded as a roll clamping mechanism, in which the bearing seat one can be regarded as a sliding seat and the bearing seat two can be regarded as a fixed seat; the descaling roll is equivalent to the upper brush roll; the roll shafts at both ends of the upper brush roll are respectively clamped into the sliding seat and the fixed seat. When changing the roll, the lifting motor drives the lifting mechanism to operate, so that the working main beam descends, and the descaling roll falls on the roll seat of the roll-changing support device. At this time, the sliding seat moves outward along the shaft seat slide rail, so that one end of the descaling roll disengages from the sliding seat, and then the upper beam is driven to slide, so that the other end of the descaling roll disengages from the fixed seat.

[0004] However, the lower brush roll usually can only be replaced manually. For example, in the scale removal device with the publication number CN216371592, the scale removal device includes a movable bearing seat for setting the lower brush roll; two bearing seats are arranged on the bearing seat, one of the two bearing seats is slidable and the other is fixedly arranged, which is similar to the above-mentioned sliding seat and fixed seat structure; the roll shafts at both ends of the lower brush roll are respectively clamped into the sliding seat and the fixed seat; when the roll needs to be replaced, the bearing seat is moved out, and then the sliding seat and the fixed seat are respectively disengaged from the roll shafts at both ends of the lower brush roll; however, there is no space below the lower brush roll to accommodate the roll-changing cart, so the lower brush roll can only be replaced manually, with low efficiency, and the lower brush roll is heavy, making the replacement difficult and prone to safety hazards.

[0005] Therefore, it is necessary to develop a lower brush roll replacement device, which needs to replace the lower brush roll manually like the roll changing cart replaces the upper brush roll, while improving the replacement efficiency of the lower brush roll, reducing the roll changing difficulty and safety risk of the lower brush roll. Summary of the Invention

[0006] The present invention provides a lower brush roll replacement device and its application. By placing the device above the bearing seat and moving two roller support assemblies from the buffer area to the supporting area to support the roller body of the lower brush roll, when the sliding seat and the fixed seat are disengaged from the lower brush roll, it is ensured that the roller shafts at both ends of the lower brush roll will not deform, reducing the replacement difficulty of the lower brush roll and improving the replacement efficiency of the lower brush roll.

[0007] The technical solution of the present invention is realized as follows: A lower brush roll replacement device includes a frame. The lower end of the frame has a roller support area, and two symmetrically arranged roller seats are provided in the roller support area. The roller seats are slidably connected to the frame in the left-right direction; each roller seat includes two support parts that are opposite to each other front and back and extend downward. An avoidance groove that is open at the lower end and used to avoid the roller shaft is formed between the two support parts. A support block for supporting the lower brush roll is provided inside the support part; two support blocks that are opposite to each other front and back on each roller seat constitute a roller support assembly; the roller support area includes a supporting area corresponding to the roller body of the lower brush roll and buffer areas located on both left and right sides of the supporting area; in the initial state, the two roller support assemblies are in the buffer areas. The two roller seats can approach each other and move the two roller support assemblies from the buffer areas to predetermined positions in the supporting area.

[0008] Preferably, the support block is provided with a support groove that is open outward. The support groove includes a support surface for supporting the lower brush roll and a limiting surface perpendicular to the support surface. When the two roller support assemblies move from the buffer areas to the predetermined positions in the supporting area, the distance between the limiting surfaces on both left and right sides matches the distance between the two ends of the roller body of the lower brush roll; while the two roller support assemblies support the roller body, the two limiting surfaces can form limits on the two end surfaces of the roller body to prevent the lower brush roll from moving horizontally and shifting.

[0009] Preferably, a telescopic linkage is provided between the two roller seats. The telescopic linkage drives the two roller seats to approach each other to a predetermined position through its own telescoping; the two roller seats can be separated from each other to replace lower brush rolls of different lengths.

[0010] Preferably, the telescopic linkage is a linkage oil cylinder. The linkage oil cylinder includes a cylinder body respectively hinged on the two roller seats and a telescopic rod that moves in the cylinder body; the linkage oil cylinder has sufficient thrust, and the hinged design can prevent the telescopic rod from jamming when it expands and contracts.

[0011] Preferably, the number of the linkage cylinders is two. The roller seat includes a cross plate horizontally and slidably connected to the lower end of the frame. Two support portions are connected to the lower end of the cross plate. A longitudinal plate is provided between the cross plate and each support portion. The piston rod and the cylinder body of each linkage cylinder are respectively hinged to two longitudinally opposed plates on the left and right; thus, the front and rear ends of the roller seat can move synchronously.

[0012] Preferably, the two roller seats are connected by a telescopic linkage member to form a roller seat assembly that can move synchronously. A positioning assembly is provided between the frame and the roller seat assembly. The positioning assembly includes an adjusting gear and an adjusting rack. The adjusting gear is provided on one of the frame and the roller seat assembly, and the adjusting rack is provided on the other of 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. By rotating the control handwheel, the two roller seats can be driven to move synchronously in the left-right direction and stop at the corresponding positions. The positioning assembly can adjust the position of the entire roller seat assembly on the frame so that when changing the rollers, the two roller seats are symmetrically located at both ends of the lower brush roller.

[0013] Preferably, a lifting and adjusting mechanism is further provided on the frame. After the two roller seats approach each other to a predetermined position, the lifting and adjusting mechanism can lift the height of the frame to adjust the supporting position of the supporting block, so that the supporting block effectively supports the roller body.

[0014] Preferably, the lifting and adjusting mechanism includes a driving component and an eccentric adjusting component symmetrically arranged on the left and right of 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 rotating wheels arranged on the frame. The lifting component includes a lifting member for acting on the bearing seat and two connecting rods arranged between the lifting member and the two front and rear opposite rotating wheels. The lower end of each connecting rod is hinged to the lifting member, and the upper end of the connecting rod is eccentrically rotatably connected to the corresponding rotating wheel. The driving component can drive the two sets of left and right opposite rotating wheels to rotate synchronously by a predetermined angle, so that the two lifting members move downward and lift the frame upward to adjust the supporting position of the supporting block. The eccentric adjusting component can drive the lifting member to act on the bearing seat through eccentric transmission, thereby forming an upward reaction force on the frame and lifting the frame by a predetermined height, so that the supporting block supports the roller body.

[0015] Preferably, the rotating wheel is a rotating gear. The driving component includes a driving shaft and two driving gears. A linkage rod is connected between the two driving gears. The corresponding driving gear meshes with the two front and rear opposite rotating gears on the left or right at the same time. The driving shaft directly or indirectly acts on one of the driving gears. The outer end of the driving shaft is connected with an adjusting handwheel. By rotating the adjusting handwheel, the multiple rotating wheels rotate by a predetermined angle and stop at the corresponding positions. The two front and rear opposite rotating gears are driven by gear meshing, so that the front and rear ends and the left and right ends of the frame are lifted upward by a predetermined height at the same time.

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

[0017] Preferably, a central hole is provided in the middle of the rotating wheel, and a rotating shaft hole concentric with the central hole is provided at the upper end of the connecting rod. An eccentric assembly is installed in the rotating shaft hole. The eccentric assembly includes a transmission shaft and an eccentric bushing. An eccentric hole not concentric with the rotating shaft hole is provided on the eccentric bushing. The transmission shaft passes through the eccentric hole and the central hole and is circumferentially fixed to the eccentric bushing and the rotating wheel. The rotating wheel rotates to drive the lifting member to move downward. The eccentric bushing can rely on the rotation of the rotating wheel and form an eccentric drive for the connecting rod, eliminating the need to open an eccentric through hole on the rotating wheel, ensuring uniform stress distribution of the rotating wheel, reducing the damage probability of the rotating wheel and the maintenance cost while driving the lifting member to move downward.

[0018] Based on the application of the lower brush roller replacement device, it includes the following steps: S1: Place the lower brush roller replacement device in place at the upper end of the bearing seat, and make the positions of the two avoidance grooves correspond to the two roller shafts of the lower brush roller one by one; S2: Control the two roller seats to move closer to each other, so that the two roller support assemblies move from the buffer area to the predetermined positions in the support area and support the roller body of the lower brush roller; S3: Control the sliding seat to slide and disengage one end of the lower brush roller, and then make the two roller seats slide in the direction away from the fixed seat to disengage the fixed seat from the other end of the lower brush roller; S4: Remove the lower brush roller replacement device from the upper end of the bearing seat, thereby removing the lower brush roller from the bearing seat.

[0019] The beneficial effects of the present invention adopting the above technical solutions are as follows: The lower brush roller replacement device in the present invention can be placed at the upper end of the bearing seat for replacing the lower brush roller. During the replacement, the avoidance grooves on the roller seats can avoid the roller shafts at the ends of the lower brush roller, and the corresponding roller support assemblies can support the roller body of the lower brush roller, preventing the roller shafts from tilting or deforming when the sliding seat and the fixed seat disengage from the lower brush roller. Compared with replacing the roller manually, this lower brush roller replacement device reduces the difficulty of replacing the lower brush roller and improves the replacement efficiency of the lower brush roller.

[0020] The two roller seats are moved away from each other through a telescopic linkage to adapt to lower brush rollers of different lengths. After the distance between the two roller seats is adjusted in place, the telescopic linkage can make the two roller seats approach each other, enabling the two roller seats to support lower brush rollers of different length specifications. The telescopic linkage eliminates the process of manually adjusting the two roller seats and also increases the applicable range of the lower brush roller replacement device.

[0021] Ideally, after the two front and rear supporting blocks move in place along with the roller seats, the supporting blocks should be aligned with the roller body. However, due to errors, it is difficult to ensure the absolute accuracy of the positions of the supporting blocks. Therefore, the distance between the two front and rear supporting blocks is relatively wide, leaving a preset gap between the supporting blocks and the roller body of the lower brush roller after the supporting blocks move in place with the roller seats, to avoid interference between the supporting blocks and the roller body of the lower brush roller when the supporting blocks move; but the preset gap left will make it difficult for the supporting blocks to contact the roller body. Therefore, the present invention provides a lifting and adjusting mechanism. After the supporting blocks move in place with the roller seats, the lifting and adjusting mechanism can adjust the height position of the frame to compensate for the preset gap and ensure a stable supporting effect of the supporting blocks on the roller body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural diagram of the lower brush roller replacement device; Figure 2 is a schematic diagram of the supporting area and buffer area on the lower brush roller replacement device; Figure 3 is a cross-sectional view of two front and rear supporting blocks holding the roller body of the lower brush roller; Figure 4 is a schematic diagram of the lower brush roller replacement device placed on the upper end of the bearing seat; Figure 5 is a 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 a 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 a structural diagram of the lifting and adjusting mechanism after hiding the frame; Figure 8 is a cross-sectional view of the lifting and adjusting mechanism; Figure 9 is an enlarged cross-sectional view of the mating position between the upper end of the connecting rod and the transmission shaft; Figure 10 is an enlarged view of the pointer and scale on the frame; Figure 11 is a structural schematic diagram of the eccentric bushing; Figure 12 is a structural schematic diagram of the positioning component; Figure 13 is a structural diagram of two roller seats supporting the lower brush roller; Figure 14 It is a structural schematic diagram of a roll seat; Figure 15 It is a schematic principle diagram for changing the roll of the lower brush roll replacement device; Figure 16 It is a comparison diagram when the preset gap exists and when the preset gap is eliminated; 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, 10 - buffer zone, 10a - supporting area, 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 block, 23 - control handwheel, 24 - supporting part, 25 - cross plate, 26 - longitudinal 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 plate, 431 - driving gear, 432 - rotating wheel, 432a - transmission shaft, 433 - connecting rod, 434 - lifting part, 435 - guiding plate, 436 - eccentric bushing, 4361 - eccentric hole, 4362 - snap 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 with reference to the accompanying 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] In the following description, many specific details are set forth 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 Figures 1-16 shown, the specific implementation manner of the present invention is as follows: This embodiment provides a lower brush roll replacement device, which can be placed on the upper end of the bearing seat 1a for replacing the lower brush roll. The bearing seat 1a is provided with a sliding seat 14 and a fixed seat 15 for clamping the roller shafts at both ends of the lower brush roll; the sliding seat 14 and the fixed seat 15 are arranged in a box body with a single-sided opening on the bearing seat 1a, and the box body can receive this lower brush roll replacement device; the device includes a frame 1, the lower end of the frame 1 has a roller support area, and there are two symmetrically arranged roller seats 2 in the roller support area. The roller seats 2 are slidably connected to the frame 1 in the left-right direction; the roller seat 2 includes two support parts 24 that are opposite to each other front and back and extend downward. An avoidance groove 241 that is open at the lower end and used to avoid the roller shaft is formed between the two support parts 24. A support block 22 for supporting the lower brush roll is arranged inside the support part 24; two support blocks 22 that are opposite to each other front and back on each roller seat 2 constitute a roller support assembly; the roller support area includes a support area 10a corresponding to the roller body 5 of the lower brush roll and buffer areas 10 on the left and right sides of the support area 10a; in the initial state, the two roller support assemblies are in the buffer areas 10. The two roller seats 2 can approach each other, and the two roller support assemblies are moved from the buffer areas 10 to a predetermined position in the support area 10a to effectively support the roller body 5 of the lower brush roll, avoiding deformation of the roller shaft when the sliding seat 14 and the fixed seat 15 are disengaged from the lower brush roll.

[0026] Furthermore, the roller body 5 of the lower brush roll includes a roller barrel for arranging brush strips. The outer diameter of the roller barrel is much larger than the outer diameter of the roller shaft. If the brush strips are not considered, the support block 22 can support on the roller barrel. However, to avoid contact between the support block 22 and the brush strips on the roller barrel, causing deformation of the brush strips, circular bosses 51 for arranging the roller shafts are concentrically installed at both left and right ends of the roller barrel. The outer diameter of the circular boss 51 is smaller than the outer diameter of the roller barrel; after the two roller seats 2 approach each other to a predetermined position, in this embodiment, the support block 22 supports the roller body 5 means that after the support block 22 moves in place with the roller seat 2, it supports the outer periphery of the circular boss 51, ensuring that the brush strips of the lower brush roll are not deformed by the extrusion of the support block 22.

[0027] Furthermore, as Figures 13-14As shown, in addition to supporting the roller body 5, the two idler roller assemblies should exert a limiting force on the roller body 5 of the lower brush roller in the left-right direction to prevent the lower brush roller from moving left and right when disengaging from the sliding seat 14 and the fixed seat 15. Therefore, the supporting block 22 in this embodiment is provided with an outwardly open supporting groove. The supporting groove includes a supporting surface 221 for supporting the lower brush roller and a limiting 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; when the two idler roller assemblies move from the buffer area 10 to a predetermined position within the supporting area 10a, the distance between the limiting surfaces 222 on the left and right sides matches the distance between the two ends of the roller body 5 of the lower brush roller; while the two idler roller assemblies support the roller body 5, the two limiting surfaces 222 can limit the two end faces of the roller body 5. Here, the two end faces of the roller body 5 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 block 22 can effectively prevent the lower brush roller from moving horizontally and shifting.

[0028] Furthermore, the area of the limiting surface 222 on the supporting block 22 is small, and there are only two supporting blocks 22 on each roller seat 2. The two limiting surfaces 222 of the two supporting blocks 22 can only form two limiting points on the outer end face of the roller body 5. Therefore, to increase the stability of the roller body 5, a contact plate for contacting the end face of the roller body of the lower brush roller is provided inside the supporting portion 24. The contact plate is provided with a contact surface 242, and the contact surface 242 is in the same vertical plane as the limiting surface 222 to increase the contact area between the roller seat 2 and the end of the roller body 5, forming four limiting points on the end of the roller body 5 to keep the roller body 5 axially stable between the two roller seats 2.

[0029] Furthermore, to replace lower brush rollers of different lengths, a telescopic linkage is provided between the two roller seats 2. The telescopic linkage drives the two roller seats 2 to approach each other to a predetermined position through its own telescoping; enabling the two roller seats 2 to move away from each other to replace lower brush rollers of different lengths. After the distance between the two roller seats 2 is adjusted in place, the telescopic linkage can drive the two roller seats 2 to approach each other again, causing the two idler roller assemblies to move into place in the left-right direction; to provide sufficient linkage force for the two roller seats 2, the telescopic linkage is a linkage oil cylinder 21. The linkage oil cylinder 21 includes a cylinder body respectively hinged on the two roller seats 2 and a telescopic rod moving inside the cylinder body; the linkage oil cylinder 21 has sufficient thrust, and the hinge design can prevent the telescopic rod from jamming when telescoping.

[0030] Furthermore, the structure of the roller seat 2 is as follows: The roller seat 2 includes a cross plate 25 horizontally and slidably connected to the lower end of the frame 1. Two support portions 24 are connected to the lower end of the cross plate 25. A longitudinal plate 26 is provided between the cross plate 25 and each support portion 24. The longitudinal plate 26 is both the carrier for installing the linkage oil cylinder 21 and strengthens the connection between the cross plate 25 and the support portion 24. At the same time, in this embodiment, the number of linkage oil cylinders 21 is two. The piston rod and the cylinder body of each linkage oil cylinder 21 are respectively hinged on two longitudinally opposed longitudinal plates 26, enabling the front and rear ends of the roller seat 2 to move synchronously. 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 longitudinal plate 26. To ensure proper hinging, a fixing plate 261 is connected to the longitudinal plate 26, and hinge holes are machined on both the longitudinal plate 26 and the fixing plate 261. The fixing plate 261 can increase the thickness of the longitudinal plate 26 to compensate for the gap between the longitudinal 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-rear direction.

[0031] 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 cross 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 light weight 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 cross plate 25. The middle of the lower ends of the two vertical plates 243 is 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. The connecting plate 244 and the two vertical plates 243 form the hollow support.

[0032] Furthermore, in addition to linking the two roller seats 2 to move closer to or away from each other, the telescopic linkage member also connects the two roller seats 2 through the telescopic linkage member to form a roller seat assembly that can move synchronously. The entire roller seat assembly can slide on the frame 1. Specifically, two guide rails are provided on the frame 1 at intervals in the front-rear direction. A corresponding connecting seat 251 is installed on the upper end of the cross 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 when changing the rollers, the two roller seats 2 are symmetrically arranged left and right with the lower brush roller as the reference, and to ensure that the two idler assemblies can simultaneously support the circular bosses 51 at both ends of the roller. A positioning assembly is provided between the frame 1 and the roller seat assembly, such as Figure 12As shown, the positioning component includes an adjusting gear 232 and an adjusting rack 231. The adjusting gear 232 is arranged on one of the frame 1 and the roller seat assembly, and the adjusting rack is arranged on the other of the frame 1 and the roller seat assembly. In this embodiment, the adjusting gear 232 is arranged on one of the roller seats 2, and the adjusting rack 231 is arranged on the frame 1 for explanation. Correspondingly, a rotating shaft sleeve 252 is installed on the 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. By rotating the control handwheel 23, the two roller seats 2 can be driven to move synchronously in the left-right direction and stop at the corresponding positions. The positioning component can adjust the position of the entire roller seat assembly on the frame 1, so that when changing the roller, the positions of the two roller seats 2 can be adjusted to make the two roller seats 2 symmetrically located at both ends of the lower brush roller.

[0033] Furthermore, as Figure 16 shown, in an ideal state, after the two front and rear supporting blocks 22 move into place along with the roller seat 2, the supporting blocks 22 should be aligned with the roller body 5 and closely attached 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 blocks 22. Therefore, to avoid interference between the supporting blocks 22 and the roller body 5 of the lower brush roller when the supporting blocks 22 move, the distance between the two front and rear supporting blocks 22 is relatively wide, so that a preset gap s is left between the supporting blocks 22 and the roller body 5 of the lower brush roller after the supporting blocks 22 move into place with the roller seat 2. This preset gap s can prevent the supporting blocks 22 from colliding and interfering with the circular boss 51 after moving into place. However, the preset gap s left will make it difficult for the supporting blocks 22 to contact the circular boss 51 on the roller body 5. Therefore, a lifting and adjusting mechanism 4 is also provided on the frame 1. After the two roller seats 2 approach each other to a predetermined position, the lifting and adjusting mechanism 4 can lift the height of the frame 1 to adjust the supporting position of the supporting blocks 22, so that the supporting blocks 22 can effectively support the roller body 5.

[0034] Specifically, as Figures 7-9As shown in the figure, the lifting and adjusting mechanism 4 includes a driving component and an eccentric adjusting component 43 symmetrically arranged on the left and right sides 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 relative rotating wheels 432 arranged on the frame 1. The lifting component includes a lifting member 434 for acting on the bearing seat 1a, and two connecting rods 433 arranged between the lifting member 434 and the two front and rear relative rotating 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 rotating wheel 432. The driving component can drive the two sets of left and right relative rotating wheels 432 to rotate synchronously by a predetermined angle, so that the two lifting members 434 move downward and lift the frame 1 upward to adjust the supporting position of the supporting block 22. The eccentric adjusting component can drive the lifting member 434 to act on the bearing seat 1a through eccentric transmission, 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 clearance s. After eliminating the preset clearance s, the supporting block 22 can closely adhere to the outer periphery of the circular boss 51 and support the roller body 5.

[0035] Furthermore, in order to make the downward movement of the lifting member 434 more stable and smooth, a lifting guiding component is provided between the frame 1 and the lifting member 434. The lifting guiding component includes two front and rear relative guiding blocks arranged on the frame 1, and guiding plates 435 arranged 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.

[0036] Furthermore, the driving component needs to satisfy the requirement of simultaneously driving the two sets of front and rear relative rotating wheels 432 in the two eccentric adjusting components to rotate simultaneously. To meet this requirement, the rotating wheel 432 in this embodiment is a rotating gear. The driving component 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 is simultaneously meshed with the two front and rear relative rotating gears on the left or right side. The driving shaft 41 directly or indirectly acts on one of the driving gears 431. The outer end of the driving shaft 41 is connected with an adjusting handwheel 411. By rotating the adjusting handwheel 411, the multiple rotating wheels 432 rotate by a predetermined angle and stop at the corresponding positions. The two front and rear relative rotating gears are driven by gear meshing, so that the front and rear ends and the left and right ends of the frame 1 are simultaneously lifted upward by a predetermined height.

[0037] Furthermore, in an ideal state, the drive shaft 41 can be directly connected to one of the drive gears 431. However, in order to prevent the lifting member 434 from accidentally resetting upward and causing the preset gap s to appear again, the drive shaft 41 in this embodiment acts indirectly on one of the drive gears 431. Specifically, a self-locking transmission member is provided between the drive shaft 41 and the corresponding drive gear 431. The self-locking transmission member is a worm gear transmission box 42. The worm gear transmission box 42 has an input end and an output end. An output shaft 438 is provided at the output end. The drive shaft 41 and the worm gear transmission box 42 is connected to the input end, and the corresponding driving gear 431 is connected to the output shaft 438 of the worm gear transmission box 42; the worm gear transmission box 42 has a worm wheel and a worm connected in a transmission manner, and its specific structure is similar to the structure in the worm gear reducer, which belongs to the prior art and will not be repeated here; when the driving gear 431 rotates into place, due to the self-locking characteristics of the worm gear, the worm gear transmission box 42 can effectively limit the reverse rotation of the driving gear 431, so that the two rotating wheels 432 stop at a predetermined position; and prevent the lifting member 434 from retracting upward due to the reversal of the rotating wheel 432.

[0038] Furthermore, a common structure for the transmission connection between the rotating wheel 432 and the connecting rod 433 is to open an eccentric through hole on the rotating 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 lead to uneven stress distribution of the entire rotating wheel 432, and long-term use will affect the structural strength and service life of the rotating wheel 432. Therefore, in order to reduce maintenance costs, this embodiment improves the structure of the eccentric rotating connection, wherein a center hole is provided in the middle of the rotating wheel 432, and a rotating shaft hole concentric with the center hole is provided at the upper end of the connecting rod 433. An eccentric assembly is installed in the rotating shaft hole, and the eccentric assembly includes a transmission shaft 432a and an eccentric shaft sleeve 436. The eccentric shaft sleeve 436 The transmission shaft 432a is made of metal or plastic, and both ends of the transmission shaft 432a are rotatably connected to the frame 1; the eccentric bushing 436 is provided with an eccentric hole 4361 which is not concentric with the rotating shaft hole, and the transmission shaft 432a is passed through the eccentric hole 4361 and the center hole and is circumferentially fixed with the eccentric bushing 436 and the rotating wheel 432; the rotating wheel 432 rotates to drive the lifting member 434 to move downward; the eccentric bushing 436 can rely on the rotating wheel 432 to rotate and form an eccentric drive for the connecting rod 433, and there is no need to open an eccentric through hole on the rotating wheel 432, thereby ensuring that the stress distribution of the rotating wheel 432 is uniform, and while driving the lifting member 434 to move downward, the damage probability and maintenance cost of the rotating wheel 432 are reduced.

[0039] Furthermore, an eccentricity is formed between the center of the eccentric hole 4361 and the center of the rotating shaft hole. Considering the variation in the outer diameter of the roller body 51 of the lower brush rollers 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 magnitude of the eccentricity in this embodiment is equal to half of the predetermined height. And the predetermined angle for the synchronous rotation of the plurality of rotating wheels 432 is 180 degrees. In the initial state, the center of the rotating shaft hole is directly above the center of the central hole 432b. When the plurality of rotating wheels 432 rotate synchronously by 180 degrees, the center of the rotating shaft hole moves to directly below the center of the central hole 432b, and the center of the rotating shaft hole moves a distance equal to twice the eccentricity in the vertical direction, which is the same as the magnitude 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 magnitude of the eccentricity is 5 mm, in the initial state, the center of the rotating shaft hole of the connecting rod 433 is located at the uppermost end of the central hole. At this time, by controlling the rotating wheel 432 to rotate 180°, the preset gap s can be eliminated in place.

[0040] Furthermore, this design can also ensure that the roller shaft of the lower brush roller will not be deformed. Specifically, when the preset gap s is eliminated, the supporting surface 221 of the supporting block 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 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 magnitude of the eccentricity is also 10 mm, only by rotating the entire rotating wheel 432 by 90° can the preset gap s be eliminated. When the operator accidentally exceeds the rotation angle of the rotating 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 located at the lowermost position of the center of the central hole. When the synchronous rotation angle of the plurality of rotating wheels 432 is greater than 180 degrees, the center of the rotating shaft hole rotates around the center of the central hole 432b and moves closer to the initial position, driving the two already downward-extended lifting members 434 to reset upward. Even if the rotation angle of the rotating wheel 432 is accidentally exceeded by more than 180°, it will not cause the supporting block 22 to exert an excessive acting force on the roller body 5, ensuring the structural strength and service life of the lower brush roller.

[0041] Furthermore, to facilitate the operator to confirm whether the preset gap s is eliminated, as Figure 10As shown, the outer end of one of the transmission shafts 432a is connected to a pointer 412 exposed on the frame 1, and a dial 413 corresponding to the position of the pointer 412 is provided on the frame 1, and a plurality of scale values ​​are evenly distributed along the circumference on the dial 413: the scale value is usually an angle value. For example, when the width of the preset gap s is 10mm and the size of the eccentricity is 5mm, an angle value of 0-180° can be set on the dial 413; after the transmission shaft 432a rotates a corresponding angle and stops at a corresponding position, the scale value variation range of the pointer 412 on the dial 413 is visually inspected, that is, whether the pointer 412 is rotated 180°, thereby confirming that the preset gap s between the supporting member 22 and the roller body has been eliminated.

[0042] Furthermore, the eccentric hole 4361 and the transmission shaft 432a, and the center hole and the transmission shaft 432a are connected by keys so that 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.

[0043] Further, if Figure 9 As 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.

[0044] 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.

[0045] 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.

[0046] like Figures 4-6As shown, based on the application of the lower brush roll replacement device, the following steps are included: S1: Place the lower brush roll replacement device in place at the upper end of the bearing seat 1a, and make the positions of the two avoidance grooves 241 correspond to the two roller shafts of the lower brush roll one by one; S2: Control the two roller seats 2 to approach each other, so that the two roller support assemblies move from the buffer area 10 to the predetermined positions in the support area 10a, and form a support for the roller body 5 of the lower brush roll; S3: Control the sliding seat 14 to slide and disengage from one end of the lower brush roll, and then make the two roller seats 2 and the lower brush roll slide in the direction away from the fixed seat 15, so that the fixed seat 15 disengages from the other end of the lower brush roll; at this time, the roller body 5 under the supporting force will not tilt downward due to the disengagement of the sliding seat 14 and the fixed seat 15, so as to ensure that the roller shaft is not deformed; S4: Remove the lower brush roll replacement device from the upper end of the bearing seat 1a, so as to remove the lower brush roll from the bearing seat 1a.

[0047] Furthermore, when placing or removing the lower brush roll replacement device, usually a traveling crane and a lifting rope are used to lift or lower the frame 1. To ensure that the lower brush roll replacement device remains horizontal during the lifting process, a lifting leveling assembly is provided on the frame 1. The lifting leveling assembly includes a first lifting ear 11 and a second lifting ear 12 that are horizontally opposite. A single first lifting hole 13 is provided on the first lifting ear 11, and a plurality of horizontally spaced second lifting holes 13a are provided on the second lifting ear 12. During lifting, 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, so that the lower brush roll replacement device remains horizontal when being lifted or lowered.

[0048] Furthermore, to ensure that the lower brush roll replacement device is placed in place 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. Through 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 lower brush roll replacement device in the lifting state can be guided, so that it is 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 roller support device with the publication number CN221821042, which will not be elaborated here.

[0049] Furthermore, the two roller seats 2 are connected by a linkage oil cylinder 21 to form a roller seat assembly that can move synchronously. To ensure that after the sliding seat 14 disengages 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, a pushing oil cylinder 3 is provided on the roller seat 2 on the same side as the fixed seat 15. 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. Since the limiting surface 222 has restricted the left-right movement of the lower brush roller, the two roller seats 2 and the lower brush roller will move away from the fixed seat 15 simultaneously, so that the fixed seat 15 disengages from the other end of the lower brush roller.

[0050] Furthermore, as Figures 6-7 shown, the linkage oil cylinder 21 and the pushing oil cylinder 3 need to be driven by hydraulic oil during operation. Therefore, the frame 1 in this embodiment is a frame structure, and a hydraulic station 18 connected to both the linkage oil cylinder 21 and the pushing oil cylinder 3 through hydraulic oil pipes is provided inside the frame structure. The hydraulic station 18 can output hydraulic oil to drive the linkage oil cylinder 21 and the pushing oil cylinder 3 to act. The hydraulic station 18 is an existing hydraulic component, and its specific principle will not be elaborated here. There are a plurality of connected windows on the four side walls and the upper and lower end faces of the frame structure. The windows on the upper end face and the four side walls are connected and sealed by cover plates. The hydraulic oil pipes can pass through the lower windows close to the linkage oil cylinder 21 and the pushing oil cylinder 3 and be connected to the hydraulic station 18.

[0051] The above schematically describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A lower brush roller replacement device, characterized in that: The invention comprises a frame (1), wherein the frame (1) has a roller zone at the lower end, wherein two roller seats (2) are symmetrically arranged in the roller zone, and the roller seats (2) are slidably connected to the frame (1) in the left-right direction; the roller seat (2) comprises two supporting parts (24) which are opposite to each other in the front and rear direction and extend downward, wherein an escape groove (241) which is open at the lower end and is used to escape the roller shaft is formed between the two supporting parts (24), and a supporting block (22) for supporting a lower brush roller is arranged inside the supporting part (24); the two supporting blocks (22) which are opposite to each other in the front and rear direction on each roller seat (2) constitute a roller assembly; the roller zone comprises a supporting area (10a) corresponding to the roller body (5) of the lower brush roller, and a buffer zone (10) located on the left and right sides of the supporting area (10a); in an initial state, the two roller assemblies are located in the buffer zone (10); The two roller seats (2) can approach each other and move the two roller assemblies from the buffer area (10) to a predetermined position in the supporting area (10a).

2. A lower brush roller replacement device according to claim 1, characterized in that: The supporting block (22) is provided with a supporting groove open outwards, the supporting groove comprising a supporting surface (221) for supporting the lower brush roller, and a limiting surface (222) perpendicular to the supporting surface (221); when the two roller assemblies move from the buffer zone (10) to a predetermined position in the supporting zone (10a), the distance between the limiting surfaces (222) on the left and right sides matches the distance between the two ends of the roller body (5) of the lower brush roller.

3. A lower brush roller replacement device according to claim 1, characterized in that: A telescopic linkage member is provided between the two roller seats (2), and the telescopic linkage member drives the two roller seats (2) to approach each other to a predetermined position by its own telescopic movement.

4. A lower brush roller replacement device according to claim 3, characterized in that: The telescopic linkage member is a linkage oil cylinder (21), which comprises a cylinder body respectively hinged on two roller seats (2) and a telescopic rod movable in the cylinder body.

5. A lower brush roller replacement device according to claim 4, characterized in that: There are two linkage oil cylinders (21), the roller seat (2) comprises a transverse plate (25) horizontally slidably connected to the lower end of the frame (1), two support parts (24) are connected to the lower end of the transverse plate (25), and a longitudinal plate (26) is provided between the transverse plate (25) and each support part (24); the piston rod and cylinder body of each linkage oil cylinder (21) are respectively hinged on each of two longitudinal plates (26) opposite to each other on the left and right.

6. A lower brush roller replacement device according to claim 3, characterized in that: The two roller seats (2) are connected to form a synchronously movable roller seat assembly via a telescopic linkage; a positioning assembly is provided between the frame (1) and the roller seat assembly, the positioning assembly comprising an adjusting gear (232) and an adjusting rack (231); the adjusting gear (232) is arranged on one of the frame (1) and the roller seat assembly, and the adjusting rack is arranged on the other of the frame (1) and the roller seat assembly; a control rod is installed on the adjusting gear (232), and a control hand wheel (23) exposed on the frame (1) is installed at the outer end of the control rod; by rotating the control hand wheel (23), the two roller seats (2) can be driven to synchronously move in the left-right direction and then stop at corresponding positions.

7. A lower brush roller replacement device according to claim 1, characterized in that: The frame (1) is also provided with a lifting and adjusting mechanism (4). After the two roller seats (2) are brought close to each other to a predetermined position, the lifting and adjusting mechanism (4) can raise the height of the frame (1) to adjust the supporting position of the supporting block (22).

8. A lower brush roller replacement device according to claim 7, characterized in that: The lifting and adjusting mechanism (4) comprises a driving assembly and an eccentric adjusting assembly (43) symmetrically arranged on the frame (1). The eccentric adjusting assembly (43) comprises a lifting assembly and a transmission assembly. The transmission assembly comprises a group of rotating wheels (432) arranged on the frame (1) and arranged opposite to each other. The lifting and adjusting assembly comprises a lifting member (434) for acting on the bearing seat (1a), and two connecting rods (433) arranged between the lifting member (434) and the two rotating wheels (432) arranged opposite to each other. The lower end of each connecting rod (433) is hinged on the lifting member (434), and the upper end of the connecting rod (433) forms an eccentric rotation connection with the corresponding rotating wheel (432). The driving assembly can drive the two groups of rotating wheels (432) opposite to each other on the left and right to rotate synchronously at a predetermined angle, so that the two lifting members (434) move downward and lift the frame (1) upward, so as to adjust the supporting position of the supporting block (22).

9. A lower brush roller replacement device according to claim 8, characterized in that: The rotating wheel (432) is a rotating gear. The driving assembly comprises 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) is simultaneously meshed with two rotating gears on the left or right side that are opposite to each other in front and back. The driving shaft (41) acts directly or indirectly on one of the driving gears (431). An adjusting hand wheel (411) is connected to the outer end of the driving shaft (41). By rotating the adjusting hand wheel (411), the plurality of rotating wheels (432) are rotated to a predetermined angle and stopped at a corresponding position.

10. A lower brush roller replacement device according to claim 9, characterized in that: A self-locking transmission member is provided between the drive shaft (41) and the corresponding drive gear (431), and the self-locking transmission member is a worm gear transmission box (42). The drive shaft (41) is connected to an input end of the worm gear transmission box (42), and the corresponding drive gear (431) is connected to an output end of the worm gear transmission box (42). After the drive gear (431) rotates to a certain position, the worm gear transmission box (42) restricts the drive gear (431) from rotating in the opposite direction, so that the two rotating wheels (432) stop at a predetermined position.

11. A lower brush roller replacement device according to claim 8, characterized in that: A central hole is provided in the middle of the rotating wheel (432), a rotating shaft hole concentric with the central hole is provided at the upper end of the connecting rod (433), an eccentric assembly is installed in the rotating shaft hole, and the eccentric assembly includes a transmission shaft (432a) and an eccentric shaft sleeve (436), an eccentric hole (4361) which is not concentric with the rotating shaft hole is provided on the eccentric shaft sleeve (436), the transmission shaft (432a) is passed through the eccentric hole (4361) and the central hole, and is circumferentially fixed with the eccentric shaft sleeve (436) and the rotating wheel (432); the rotating wheel (432) rotates to drive the lifting member (434) to move downward.

12. Application of the lower brush roller replacement device according to claim 1, characterized in that: The following steps are involved: S1: placing the lower brush roller replacement device on the upper end of the bearing seat (1a) in place, and making the positions of the two avoidance grooves (241) correspond one to one to the two roller shafts of the lower brush roller respectively; S2: controlling the two roller seats (2) to move closer to each other, so that the two roller assemblies move from the buffer area (10) to a predetermined position in the supporting area (10a), and support the roller body (5) of the lower brush roller; S3: Controlling the sliding seat (14) to slide and disengage one end of the lower brush roller, and then causing the two roller seats (2) and the lower brush roller to slide in a direction away from the fixed seat (15), so that the fixed seat (15) disengages the other end of the lower brush roller; S3: moving the lower brush roller replacement device away from the upper end of the bearing seat (1a), thereby removing the lower brush roller from the bearing seat (1a).

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