Eccentric transmission structure

Abstract

The utility model discloses an eccentric transmission structure which comprises a transmission wheel and a connecting rod, the lower end of the connecting rod is used for being rotationally connected to a lifting plate, a center hole is formed in the middle of the transmission wheel, a rotating shaft hole is formed in the upper end of the connecting rod, an eccentric transmission assembly is arranged in the rotating shaft hole and comprises an eccentric sleeve, and an eccentric hole which is not concentric with the rotating shaft hole is formed in the eccentric sleeve. A rotating shaft used for being rotationally connected to the rack is arranged in the eccentric hole and a center hole in the rotating wheel in a penetrating mode at the same time, and the transmission wheel and the eccentric sleeve are both circumferentially fixed to the rotating shaft. On the premise that an eccentric hole does not need to be formed in the transmission wheel, eccentric transmission is formed on the connecting rod when the transmission wheel rotates, the maintenance cost and the damage probability of the transmission wheel are reduced, and the replacement efficiency of the lower brush roller is indirectly improved.

Description

Technical Field

[0001] This utility model relates to the field of strip grinding, and in particular to an eccentric transmission structure. Background Technology

[0002] Steel plates, also known as strips, are rolled up and stored after production, commonly known as steel coils. These coils then go to different product manufacturing plants to be made into corresponding parts, depending on the specific application requirements. During the period between the strip entering the processing plant and being cut, the surface material of the strip is prone to peeling or corrosion. To remove the rust layer, the strip needs to be polished using upper and lower brush rollers installed in a steel plate grinding and brushing equipment. Both upper and lower brush rollers include a roller body and roller shafts located at both ends of the roller body. After prolonged polishing, the polishing effect of the brush rollers will decrease, thus requiring replacement.

[0003] When replacing the upper brush roller, the roller replacement trolley can be driven into the brush grinding equipment. However, the lower brush roller can usually only be replaced manually. For example, in the oxide scale treatment device with announcement number CN216371592, the oxide scale treatment device includes a movable support for setting the lower brush roller. The support is equipped with two bearing seats, one of which is slidable and the other is fixed. The two bearing seats can be regarded as a sliding seat and a fixed seat respectively. The roller shafts at both ends of the lower brush roller are respectively inserted into the sliding seat and the fixed seat. When the roller needs to be replaced, the support is moved out of the equipment, and the worker uses a sling to suspend the lower brush roller, so that the sliding seat and the fixed seat are disengaged from the roller shafts at both ends of the roller body. However, this replacement method is more difficult to operate.

[0004] The applicant designed a lower brush roller replacement mechanism, including a frame for placing on the upper end of a support seat. The lower end of the frame is provided with two roller seats slidably connected to the frame. Each roller seat includes two front-to-back opposing support parts. The inner side of each support part has a support block. The two front-to-back opposing support blocks constitute a roller support assembly. When the two roller seats approach each other and the two roller support assemblies support the roller body of the lower brush roller, the lower brush roller remains stable. At this time, the sliding seat and the fixed seat can be disengaged from the two ends of the lower brush roller respectively, and the roller shaft of the lower brush roller remains unchanged.

[0005] Ideally, the support block should be tightly attached to the lower brush roller. However, due to errors, the actual installation position of the support block will always have a positional deviation. Therefore, in order to avoid interference between the support block and the roller, the distance between the two opposing support blocks is relatively wide, so that after the two roller seats are moved into place, a preset gap is formed between the support block and the roller. However, after leaving the preset gap, the support block is separated from the roller and it is difficult to provide support for the lower brush roller. When the sliding seat disengages from the roller shaft at one end of the lower brush roller, the roller shaft at the other end of the lower brush roller, which is stuck in the fixed seat, will still deform.

[0006] To eliminate the preset gap, the brush roller changing mechanism is also equipped with an eccentric adjustment mechanism, including a lifting plate and a transmission wheel rotatably connected to the frame. A connecting rod is hinged between the transmission wheel and the lifting plate, such as... Figure 17 As shown, the upper end of the connecting rod is eccentrically connected to the drive wheel. The drive wheel has an eccentric hole, and the upper end of the connecting rod has a shaft hole. A rotating shaft passes through both the eccentric hole and the shaft hole. When the drive wheel rotates, it generates an eccentric transmission force on the connecting rod and drives the lifting plate to move downward to press against the bearing seat, forcing the frame to rise to eliminate the preset gap. However, this eccentric transmission connection method can easily affect the roller changing efficiency. Specifically, when the drive wheel rotates, the eccentric hole deviates from the center position of the drive wheel, which will cause uneven stress distribution throughout the drive wheel. Long-term use can easily reduce the life of the drive wheel and cause damage to the drive wheel. In addition to increasing the cost of the components, replacing the drive wheel will also take a long time, affecting the replacement efficiency of the lower brush roller. Summary of the Invention

[0007] This utility model provides an eccentric transmission structure. By setting an eccentric sleeve in the shaft hole of the connecting rod and passing a circumferentially fixed rotating shaft between the eccentric sleeve and the center hole of the transmission wheel, the transmission wheel can generate eccentric transmission to the connecting rod when it rotates without having to open the eccentric hole on the transmission wheel. This reduces the maintenance cost and damage probability of the transmission wheel and indirectly improves the replacement efficiency of the lower brush roller.

[0008] The technical solution of this utility model is implemented as follows:

[0009] An eccentric transmission structure includes a transmission wheel and a connecting rod. The lower end of the connecting rod is rotatably connected to a lifting plate. The transmission wheel has a central hole in the middle. The upper end of the connecting rod has a shaft hole. An eccentric transmission assembly is provided in the shaft hole. The eccentric transmission assembly includes an eccentric sleeve. The eccentric sleeve has an eccentric hole that is not concentric with the shaft hole. A rotating shaft for rotatably connecting to a frame is passed through both the eccentric hole and the central hole on the rotating wheel. The transmission wheel and the eccentric sleeve are both circumferentially fixed to the rotating shaft.

[0010] The transmission wheel can rotate along its central axis and drive the eccentric sleeve to rotate via the rotating shaft, thereby driving the lifting plate to move up and down.

[0011] Preferably, the eccentric hole and the rotating shaft, and the center hole and the rotating shaft are connected by a key so that the transmission wheel and the eccentric sleeve are circumferentially fixed to the rotating shaft.

[0012] Preferably, the eccentric hole and the rotating shaft, as well as the central hole and the rotating shaft, are connected by a flat key.

[0013] Preferably, the eccentric hole and the rotating shaft, as well as the central hole and the rotating shaft, are connected by splines.

[0014] Preferably, a spherical bearing is installed in the shaft hole, and the spherical bearing is sleeved on the outer wall of the eccentric sleeve; while ensuring that the rotating shaft rotates smoothly in the circumferential direction, the spherical bearing allows the connecting rod to swing in the lateral direction relative to the rotating shaft, so as to avoid excessive lateral force on the connecting rod.

[0015] Preferably, the connecting rod has end caps at both ends of the shaft hole to seal the shaft hole, ensuring that the components inside the shaft hole are isolated from the outside.

[0016] Preferably, the connecting rod has end caps at both ends of the shaft hole to seal the shaft hole, and the outer wall of the eccentric sleeve has two snap ring grooves corresponding to the positions of the two ends of the spherical bearing. The snap ring grooves are equipped with retaining rings, and the two retaining rings are respectively held by the two end caps to restrict the eccentric sleeve from moving axially.

[0017] Preferably, the eccentric sleeve is made of metal or plastic; eccentric sleeves made of metal or plastic have high structural strength and a long service life.

[0018] Preferably, there is an eccentricity between the center of the eccentric hole and the center of the rotating shaft hole, and the eccentricity ranges from 3mm to 12mm.

[0019] The beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0020] In this invention, when the rotating wheel and connecting rod are eccentrically connected, an eccentric sleeve with an eccentric hole is set inside the shaft hole of the connecting rod. A rotating shaft is simultaneously inserted into the eccentric hole and the center hole of the transmission wheel, so that the rotating shaft is circumferentially fixed with both the transmission wheel and the eccentric sleeve. When the transmission wheel rotates, the rotating shaft can drive the eccentric sleeve to rotate eccentrically, thereby driving the connecting rod to move longitudinally. This design does not have an eccentric hole on the transmission wheel, ensuring uniform stress distribution when the transmission wheel rotates, reducing the maintenance cost and probability of damage to the transmission wheel, and indirectly improving the replacement efficiency of the lower brush roller. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the roller changing assembly;

[0022] Figure 2 This is a schematic diagram of the roller changing assembly from another angle;

[0023] Figure 3 A cross-sectional view of the roller body supporting the lower brush roller, with two front and rear opposing support members.

[0024] Figure 4 This is a schematic diagram showing the roller changing assembly placed on top of the support.

[0025] Figure 5 This is a schematic diagram showing the sliding seat disengaging from one end of the lower brush roller shaft after the lower brush roller body is supported.

[0026] Figure 6 A schematic diagram illustrating how the hydraulic cylinder is pushed to actuate and causes the roller shaft at the other end of the lower brush roller to disengage from the fixed seat;

[0027] Figure 7 The structural diagram of the clearance compensation mechanism is shown below, with the frame removed.

[0028] Figure 8 This is a cross-sectional view of the clearance compensation mechanism;

[0029] Figure 9 This is an enlarged sectional view of the position where the upper end of the connecting rod mates with the rotating shaft;

[0030] Figure 10 An enlarged view of the pointer and dial on the frame;

[0031] Figure 11 This is a schematic diagram of the eccentric sleeve structure;

[0032] Figure 12 This is a schematic diagram of the positioning adjustment component;

[0033] Figure 13 A structural diagram showing how two roller supports hold up the lower brush roller;

[0034] Figure 14 This is a schematic diagram of the roller holder structure;

[0035] Figure 15 A simplified diagram illustrating the principle of the roller changing assembly changing rollers at the upper end of the support.

[0036] Figure 16 A comparison diagram showing the presence of the preset gap and the elimination of the preset gap;

[0037] Figure 17 This is a schematic diagram of a transmission wheel with an eccentric hole and rotatably connected to a connecting rod in the background art.

[0038] The reference numerals in the attached drawings are as follows: 1-Frame, 1a-Bearing seat, 2-Roller seat, 3-Pushing cylinder, 4-Clearance compensation mechanism, 5-Roller 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-Guide seat, 17-Guide wheel, 18-Hydraulic station, 21-Linkage cylinder, 22-Support component, 23-Control handwheel, 24-Support part, 25-Horizontal plate, 26-Longitudinal plate, 27-Reinforcing plate, 41-Drive shaft, 42-Worm gear transmission box, 43-Eccentric adjustment assembly, 221-Supporting surface. 222-Limiting surface, 231-Adjusting rack, 232-Adjusting gear, 241-Allowing groove, 242-Abutting surface, 251-Connecting seat, 252-Rotating sleeve, 261-Fixing plate, 411-Adjusting handwheel, 412-Pointer, 413-Digital dial, 431-Drive gear, 432-Transmission wheel, 432a-Rotating shaft, 433-Connecting rod, 434-Lifting plate, 435-Guide plate, 436-Eccentric sleeve, 4361-Eccentric hole, 4362-Snap ring groove, 4363-Annular groove, 437-Spherical bearing, 438-Output shaft, 439-Linkage rod, s-Preset clearance. Detailed Implementation

[0039] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0040] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0041] like Figure 1-16 As shown, the specific embodiments of this utility model are as follows:

[0042] This embodiment provides an eccentric transmission structure used in a roller changing mechanism, which includes:

[0043] The support assembly includes a support base 1a and a sliding seat 14 and a fixed seat 15 disposed on the support base 1a and used to clamp the roller shafts at both ends of the lower brush roller. The sliding seat 14 can slide along the length direction of the lower brush roller. The sliding seat 14 and the fixed seat 15 are disposed in a box with an opening on one side on the support base 1a.

[0044] The roller changing assembly includes a frame 1 placed on the upper end of the support seat 1a. In this embodiment, the frame 1 is placed on the upper end of the housing. Two symmetrical roller seats 2 are slidably connected to the lower end of the frame 1. A telescopic linkage is provided between the two roller seats 2 to drive the two roller seats 2 to move closer to each other. A telescopic pushing member is provided on the roller seat 2 facing the fixed seat 15. The roller seat 2 includes two support parts 24 that are opposite to each other and extend downward. A support member 22 is connected to the inner side of the support part 24. A clearance area 241 with an open lower end is formed between the two support parts 24. The two clearance areas 241 correspond to the roller shaft positions at both ends of the lower brush roller.

[0045] In operation, the telescopic linkage drives the two roller seats 2 to move closer to each other and moves the two sets of front and rear opposing support members 22 to a predetermined position to form a rigid support for the roller body 5 of the lower brush roller. When the sliding seat 14 disengages from the roller shaft at one end of the lower brush roller, the telescopic pusher extends and extends and acts on the fixed seat 15, causing the two roller seats 2 to slide away from the fixed seat 15, so that the roller shaft at the other end of the lower brush roller disengages from the fixed seat 15.

[0046] Furthermore, the roller body 5 of the lower brush roller includes a roller for laying brush strips. The outer diameter of the roller is much larger than the outer diameter of the roller shaft. If the brush strips are not considered, the support member 22 can be supported on the roller. However, in order to avoid the support member 22 contacting the brush strips on the roller and causing the brush strips to deform, circular bosses 51 for setting the roller shaft are concentrically installed at both ends of the roller. The outer diameter of the circular bosses 51 is smaller than the outer diameter of the roller. After the two roller seats 2 approach each other to a predetermined position, in this embodiment, the support member 22 supports the roller body 5, which means that after the support member 22 moves into place, it supports the outer periphery of the circular bosses 51, ensuring that the brush strips of the lower brush roller are not deformed by the pressure of the support member 22.

[0047] Furthermore, in order to place the roller changing assembly on the upper end of the support seat 1a, a hoisting method is adopted in this embodiment. The sling needs to be hoisted onto the hook of the crane first, and then the two ends of the sling are respectively hoisted onto the frame 1. In order to ensure that the hoisted roller changing assembly is kept horizontal, the frame 1 is provided with a hoisting leveling assembly. The hoisting leveling assembly includes a first lifting lug 11 and a second lifting lug 12 that are horizontally opposite each other. The first lifting lug 11 has a single first lifting hole 13, and the second lifting lug 12 has multiple horizontally spaced second lifting holes 13a. One end of the flexible sling is hoisted into the first lifting hole 13, and the other end of the flexible sling is hoisted into one of the multiple second lifting holes 13a. That is to say, the operator can switch the hoisting end of the sling within the multiple second lifting holes 13 until the first lifting lug 11 and the second lifting lug 12 are at the same height position, so that the hoisted roller changing assembly is kept horizontal.

[0048] Furthermore, to ensure that the roller changing assembly is placed in place on the upper end of the support seat 1a, a front-rear guide mechanism and a left-right guide mechanism are provided between the frame 1 and the support seat 1a. The front-rear guide mechanism includes an elastic guide wheel 17 set on the frame 1 and a guide block set on the support seat 1a. The left-right guide mechanism includes a guide seat 16 set on the frame 1 and a guide column set on the support seat 1a. Through the cooperation of the elastic guide wheel 17 and the guide block, and the cooperation of the guide seat 16 and the guide column, the position of the roller changing assembly in the hoisting state can be guided so that it is stably placed in the corresponding position on the upper end of the support seat 1a. The specific structure of the front-rear guide mechanism and the left-right guide mechanism can be referred to the corresponding content in the roller device patent with announcement number CN221821042, and will not be repeated here.

[0049] Furthermore, the structure of the roller seat 2 is as follows: The roller seat 2 includes a horizontal plate 25 for sliding connection to the frame 1. A support is connected to the lower end of the horizontal plate 25. The lower middle part of the support is recessed to form two front-to-back opposing support parts 24 and a clearance groove 241 between the two support parts 24. A longitudinal plate 26 is provided between the horizontal plate 25 and each support part 24. The longitudinal plate 26 is the carrier for mounting the linkage cylinder 21 and also strengthens the connection between the horizontal plate 25 and the support part 24. The aforementioned telescopic mechanism is connected between every two left-to-right opposing longitudinal plates 26. The linkage component allows the front and rear ends of the roller seat 2 to move synchronously. Two connecting ears are provided at the head end of the piston rod and the tail end of the cylinder. The width between the two connecting ears is greater than the thickness of the longitudinal plate 26. To ensure that the hinge is in place, a fixed plate 261 is connected to the longitudinal plate 26. Hinges are machined on both the longitudinal plate 26 and the fixed plate 261. The fixed plate 261 can increase the thickness of the longitudinal plate 26 to make up for the gap between the longitudinal plate 26 and the connecting ears, so that after the linkage cylinder 21 is hinged in place, the linkage cylinder 21 remains stable in the front and rear directions.

[0050] Furthermore, to ensure the structural strength of the roller seat 2, the roller seat 2 is a welded structural component, wherein the lower end of the horizontal plate 25 is provided with a support, and the middle position of the lower end of the support is recessed inward, thereby forming two support parts 24 and a clearance groove 241 located between the two support parts 24; to ensure the lightweight of the roller seat 2, the support is a hollow structure, including at least two vertical plates 243 spaced apart from each other and welded to the lower end of the horizontal plate 25, the middle position of the lower end of the two vertical plates 243 is recessed inward, thereby forming two support parts 24 and a clearance groove 241 located between the two support parts 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 structure of the support.

[0051] Furthermore, such as Figure 13-14As shown, to ensure the lower brush roller remains stable when it disengages from the sliding seat 14 and the fixed seat 15, the support member 22 is provided with an outwardly open support groove. The support groove includes a support surface 221 for supporting the lower brush roller and a vertical limiting surface 222 perpendicular to the support surface 221. To further fit the circular boss 51 of the roller body 5, the support surface 221 is an arc-shaped surface. When the two roller assemblies support the lower brush roller, the vertical limiting 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. 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 in contact with the outer end faces of the two circular bosses 51 respectively, the support member 22 can effectively prevent the lower brush roller from moving laterally.

[0052] Furthermore, the limiting surface 222 on the support member 22 has a small area, and there are only two support members 22 on each roller seat 2. The two limiting surfaces 222 of the two support members 22 can only form two limiting points on the outer end face of the roller body 5. Therefore, in order to increase the stability of the roller body 5, the inner side of the support part 24 is provided with a contact plate for contacting the end face of the lower brush roller. The contact plate is provided with a contact surface 242. The contact surface 242 and the limiting surface 222 are on the same vertical plane to increase the contact area of ​​the roller seat 2 on the end of the roller body 5 and form four limiting points on the end of the roller body 5, so that the roller body 5 remains axially stable between the two roller seats 2.

[0053] Furthermore, in order to generate sufficient linkage force for the two roller seats 2, the telescopic linkage component is a linkage cylinder 21. The linkage cylinder 21 includes a cylinder body that is respectively hinged to the two roller seats 2 and a telescopic rod that moves within the cylinder body. The piston rod extends and retracts, bringing the two roller seats 2 closer to each other to a predetermined position. The hinged design can prevent the linkage cylinder 21 from jamming when it operates.

[0054] Furthermore, such as Figure 6-7 As shown, the linkage cylinder 21 and the push cylinder 3 require hydraulic oil to drive them during operation. Therefore, the frame 1 in this embodiment is a frame structure. The frame structure is equipped with a hydraulic station 18 that is connected to both the linkage cylinder 21 and the push cylinder 3 via hydraulic oil pipes. The hydraulic station 18 can output hydraulic oil to drive the linkage cylinder 21 and the push cylinder 3. The hydraulic station 18 is an existing hydraulic component, and its specific principle will not be described in detail. The frame structure has multiple connected windows on its four side walls and upper and lower end faces. The windows on the upper end face and four side walls are sealed by cover plates. The hydraulic oil pipes can pass through the lower end windows near the linkage cylinder 21 and the push cylinder 3 and connect to the hydraulic station 18, ensuring that the linkage cylinder 21 and the push cylinder 3 can move while optimizing the layout space.

[0055] Furthermore, the linkage cylinder 21 is not only a linkage component that moves the two roller seats 2 closer or further apart, but also a connecting component between the two roller seats 2; the two roller seats 2 are connected by a telescopic linkage component to form a synchronously movable roller seat assembly; specifically, the frame 1 is provided with two guide rails spaced apart front and rear, and the upper end of the horizontal plate 25 of the roller seat 2 is equipped with a corresponding connecting seat 251, and a sliding sleeve is installed on the connecting seat 251, which is slidably connected to the corresponding guide rail; in order to adjust the position of the two roller seats 2 at any time, so that the two roller seats 2 are symmetrical about left and right with the lower brush roller as the reference when changing rollers, and to ensure that the two roller support assemblies can simultaneously support the circular protrusions 51 at both ends of the roller, such as Figure 12 As shown, a positioning assembly is provided between the frame 1 and the roller seat assembly. The positioning assembly includes an adjusting rack 231 and an adjusting gear 232 respectively mounted on the frame 1 and the roller seat assembly. A control rod is mounted on the adjusting gear 232, and a rotating shaft sleeve 252 is mounted on the corresponding roller seat 2. The control rod is located inside the rotating shaft sleeve 252, with both ends of the control rod extending out of the rotating shaft sleeve 252. One end of the control rod is connected to the adjusting gear 252, and a control handwheel 23 exposed on the frame 1 is mounted on the outer end of the control rod. Rotating the control handwheel 23 moves the two roller seats 2 synchronously in the left and right directions and stops at the corresponding positions, so that before changing the roller, the two roller seats 2 are symmetrical about the left and right with the lower brush roller as the reference. This avoids the phenomenon that one end of the lower brush roller body 5 is supported while the other end is not.

[0056] Furthermore, such as Figure 16As shown, ideally, after the two opposing support members 22 move into position with the roller seat 2, the support members 22 should be aligned with the roller body 5 and closely adhere to the outer periphery of the circular boss 51. However, due to error, the position of the support members 22 is difficult to guarantee absolute accuracy. Therefore, to avoid interference between the support members 22 and the roller body 5 of the lower brush roller when they move, a preset gap s is formed between the support members 22 and the roller body 5 of the lower brush roller when the two roller seats 2 approach each other to a predetermined position. This preset gap s can prevent the support members 22 from colliding and interfering with the circular boss 51 after they move into position. However, the preset gap s makes it difficult for the support members 22 to contact the circular boss 51 on the roller body 5. Therefore, a gap compensation mechanism 4 is also provided on the frame 1. The gap compensation mechanism 4 includes a drive assembly and an eccentric adjustment assembly 43 symmetrically arranged on the frame 1. The eccentric adjustment assembly 43 includes a lifting compensation assembly and a transmission assembly. The transmission assembly includes a set of front and rear opposing support members arranged on the frame 1. The corresponding transmission wheel 432, the lifting compensation assembly includes a lifting plate 434 and a set of connecting rods 433 disposed between the lifting plate 434 and two front-to-back opposing transmission wheels 432. The lower end of each connecting rod 433 is hinged to the lifting plate 434, and the upper end of the connecting rod 433 is eccentrically rotated with the corresponding transmission wheel 432. The drive assembly can drive the two sets of left-to-right opposing transmission wheels 432 to rotate synchronously by a predetermined angle, so that the two lifting plates 434 act downward on the bearing seat 1a and lift the frame 1 to a predetermined height, thereby eliminating the preset gap s between the support member 22 and the roller body 5. When the transmission wheel 432 rotates, the drive assembly can drive the lifting plate 434 to act on the bearing seat 1a through the eccentric adjustment assembly, thereby forming an upward reaction force on the frame 1 and raising the frame 1 to a predetermined height. The size of the predetermined height is the size of the preset gap s. After eliminating the preset gap s, the support member 22 can closely adhere to the outer periphery of the circular boss 51 and support the roller body 5.

[0057] Furthermore, to make the downward movement of the lifting plate 434 more stable and smooth, a lifting guide assembly is provided between the frame 1 and the lifting plate 434. The lifting guide assembly includes two front-to-back guide blocks set on the frame 1, and guide plates 435 set at the front and rear ends of the lifting plate 434. The guide plates 435 are made of plastic. The two guides form a guide groove, and the two guide plates 435 contact the corresponding inner walls of the guide groove and can move up and down to guide the movement of the lifting plate 434.

[0058] Furthermore, the drive assembly needs to simultaneously drive two sets of front-to-back opposing transmission wheels 432 in the two eccentric adjustment assemblies to rotate simultaneously. To meet this requirement, the transmission wheel 432 is a transmission gear. The drive assembly includes a drive shaft 41 and two drive gears 431, with a linkage rod 439 connecting the two drive gears 431. The corresponding drive gear 431 meshes with each pair of front-to-back opposing transmission gears simultaneously. The drive shaft 41 is directly or indirectly connected to one of the drive gears 431. An adjusting handwheel 411 is connected to the outer end of the drive shaft 41. Rotating the adjusting handwheel 411 causes the multiple transmission wheels 432 to rotate synchronously at a predetermined angle and stop at the corresponding position, thereby eliminating the preset gap s between the support member 22 and the roller body 5 and ensuring that the support member 22 supports the roller body 5.

[0059] Furthermore, ideally, the drive shaft 41 could be directly connected to one of the drive gears 431. However, to prevent the lifting plate 434 from accidentally resetting upwards and causing the preset gap s to reappear, in this embodiment, the drive shaft 41 acts indirectly on one of the drive gears 431. Specifically, a self-locking transmission component is provided between the drive shaft 41 and the corresponding drive gear 431. The self-locking transmission component is a worm gear transmission box 42, which contains a worm wheel and a worm connected in a transmission connection. Its specific structure is similar to... The structure of the worm gear reducer is similar and belongs to existing technology, so it will not be described in detail here. The worm gear transmission box 42 has an input end and an output end. The output end is equipped with an output shaft 438. The drive shaft 41 is connected to the input end of the worm gear transmission box 42, and the corresponding drive gear 431 is connected to the output end of the worm gear transmission box 42. After the drive gear 431 rotates to its position, due to the self-locking characteristic of the worm gear, the worm gear transmission box 42 restricts the drive gear 431 from rotating in the opposite direction, so that the two transmission wheels 432 stop at the predetermined position. This prevents the lifting plate 434 from retracting upwards due to the reverse rotation of the transmission wheels 432.

[0060] Furthermore, a common structure for the transmission connection between the transmission wheel 432 and the connecting rod 433 is to have an eccentric through hole in the transmission wheel 432, and then hinge the connecting rod 433 to the position of the eccentric through hole via a rotating shaft. However, this structure leads to uneven stress distribution throughout the transmission wheel 432, which will affect the structural strength and service life of the transmission wheel 432 in the long run. Therefore, to reduce maintenance costs, this embodiment uses an eccentric transmission structure to drive the movement of the connecting rod 433. The eccentric transmission structure includes a transmission wheel 432 and a connecting rod 433. The lower end of the connecting rod 433 is rotatably connected to the lifting plate 434. The transmission wheel 432 has a central hole in the middle, and the upper end of the connecting rod 433 has a rotating shaft hole. An eccentric transmission assembly is provided in the rotating shaft hole. The eccentric transmission assembly includes an eccentric sleeve 436, which is made of metal or plastic. The eccentric sleeve 436 has high structural strength and a long service life. The eccentric sleeve 436 has an eccentric hole 4361 that is not concentric with the shaft hole. A rotating shaft 432a for rotatably connecting to the frame 1 is simultaneously inserted into both the eccentric hole 4361 and the center hole 4361 on the rotating wheel. Both the transmission wheel 432 and the eccentric sleeve 436 are circumferentially fixed to the rotating shaft 432a. The transmission wheel 432 can rotate along its central axis and drives the eccentric sleeve 436 to rotate via the rotating shaft 432a. When the eccentric sleeve 436 rotates, it exerts an eccentric force on the connecting rod 433, causing the connecting rod 433 to move up and down, thereby driving the lifting plate 434 to move up and down. It eliminates the need for an eccentric through hole in the transmission wheel 432, ensuring uniform stress distribution in the transmission wheel 432. While driving the lifting plate 434 downwards, this reduces the probability of damage to the transmission wheel 432 and lowers maintenance costs.

[0061] Furthermore, to ensure that the rotating shaft 432a can drive the eccentric sleeve 436 to rotate when it rotates, the eccentric hole 4361 and the rotating shaft 432a, as well as the center hole and the rotating shaft 432a, are connected by keys to keep the transmission wheel 432 and the eccentric sleeve circumferentially fixed to the rotating shaft 432a. There are two types of key connections: the first type is that the eccentric hole 4361 and the rotating shaft 432a, as well as the center hole and the rotating shaft 432a, are connected by flat keys; the second type is that the eccentric hole 4361 and the rotating shaft 432a, as well as the center hole and the rotating shaft 432a, are connected by splines. Both of these key connection methods can ensure that the rotating shaft 432a generates sufficient circumferential driving force on the eccentric sleeve 436.

[0062] Furthermore, ideally, the rotating shaft 432a should always remain concentric with the eccentric hole 4361 when it rotates. However, due to manufacturing and installation errors, the rotating shaft 432a will have a slight relative displacement with the eccentric hole 4361 in the lateral direction when it rotates, which is the so-called misalignment phenomenon. In order to avoid the misalignment phenomenon from generating a lateral force on the connecting rod 433 and affecting the smoothness of the connecting rod 433's movement, a spherical bearing 437 is installed in the rotating shaft hole. The spherical bearing 437 is fitted on the outer wall of the eccentric sleeve 436. The contact surface between the inner and outer rings of the spherical bearing 437 is spherical. Its inner ring is fitted on the outer wall of the eccentric sleeve 436. While ensuring that the rotating shaft 432a rotates smoothly in the circumferential direction, it allows the connecting rod 433 to swing relative to the rotating shaft 432a in the lateral direction, thus avoiding excessive lateral force on the connecting rod 433.

[0063] Furthermore, the connecting rod 433 has end caps 44 at both ends of the shaft hole to seal the shaft hole, ensuring that the components inside the shaft hole are isolated from the outside. At the same time, the end caps 44 can also restrict the movement of the spherical bearing 437. Specifically, the outer wall of the eccentric sleeve 436 has two snap ring grooves 4362 corresponding to the positions of the two ends of the spherical bearing 437. The snap ring grooves 4362 have retaining rings 45 inside. The two retaining rings 45 are respectively abutted by the two end caps 44 to restrict the axial movement of the spherical bearing 437.

[0064] Furthermore, the eccentric sleeve 436, where the spherical bearing 437 is located, also has an annular groove 4363. The annular groove 4363 can accommodate lubricant, making the rotation of the rotating shaft 432a smoother. It can also serve as an installation mark, allowing the spherical bearing 437 to be quickly installed in place.

[0065] 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 different specifications of the lower brush roller, an eccentricity is formed between the center of the eccentric hole 4361 and the center of the rotating shaft hole. The size of the eccentricity ranges from 3mm to 12mm. To facilitate determining whether the preset gap s has been eliminated, in this embodiment, the size of the eccentricity is equal to half of the predetermined height. The predetermined angle of synchronous rotation of the multiple transmission wheels 432 is 180 degrees. In the initial state, the center of the rotating shaft hole is located at the center of the central hole 432b. Directly above; when multiple transmission wheels 432 rotate 180 degrees synchronously, the center of the shaft hole moves to directly below the center of the center hole 432b. The center of the shaft hole moves vertically by twice the eccentricity, which is the same as 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 10mm and the eccentricity is 5mm, then in the initial state, the center of the shaft hole of the connecting rod 433 is located at the top of the center hole. At this time, controlling the transmission wheel 432 to rotate 180° will eliminate the preset gap s.

[0066] Furthermore, this design also ensures that the lower brush roller shaft will not deform. Specifically, after the preset gap s is eliminated, the supporting surface 221 of the support 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, and the operator accidentally exceeds the predetermined angle when rotating the control handwheel 41, it will exert an upward force on the roller body 5, causing the roller shaft stuck in the sliding seat 14 and the fixed seat 15 to deform. For example, when the width of the preset gap s is 10mm and the size of the eccentricity is also 10mm, it is only necessary to rotate the entire transmission wheel 432 by 90° to eliminate the preset gap s. When the operator accidentally rotates the transmission wheel 432 by more than 90°, the lifting plate 434 will still... The roller will continue to move downwards and press against the support 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 when using the eccentricity in this embodiment. In this embodiment, after the preset gap s is eliminated, the center of the shaft hole is already located at the bottom of the center of the central hole. When the angle of synchronous rotation of multiple transmission wheels 432 is greater than 180 degrees, the center of the shaft hole rotates around the center of the central hole 432b and moves closer to the initial position, driving the two lifting plates 434 that have been extended downwards to reset upwards. Even if the rotation angle of the transmission wheel 432 is mistakenly made to exceed 180 degrees, it will not cause the support 22 to exert excessive force on the roller body 5, thus ensuring the structural strength and service life of the lower brush roller.

[0067] Furthermore, to facilitate operator confirmation of whether the preset gap s has been eliminated, such as... Figure 10 As shown, one of the rotating shafts 432a has a pointer 412 exposed on the frame 1 at its outer end. The frame 1 is provided with a scale 413 corresponding to the position of the pointer 412. The scale 413 has multiple scale values ​​evenly distributed along the circumference. The scale values ​​are usually angle values. 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 scale 413. After the rotating shaft 432a rotates to the corresponding angle and stops at the corresponding position, the range of change of the scale value of the pointer 412 on the scale 413 is visually observed, that is, whether the pointer 412 has rotated 180°, to confirm that the preset gap s between the support 22 and the roller 5 has been eliminated.

[0068] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An eccentric drive structure, characterized by, The transmission wheel (432) and the connecting rod (433) are included, the lower end of the connecting rod (433) is used for rotatingly connecting on the lifting plate (434), the middle part of the transmission wheel (432) is provided with a central hole, the upper end of the connecting rod (433) is provided with a rotating shaft hole, an eccentric transmission assembly is arranged in the rotating shaft hole, the eccentric transmission assembly includes an eccentric sleeve (436), the eccentric sleeve (436) is provided with an eccentric hole (4361) which is eccentric with the rotating shaft hole, the eccentric hole (4361) and the central hole of the transmission wheel are simultaneously provided with a rotating shaft (432a) which is used for rotatingly connecting on the rack (1), the transmission wheel (432) and the eccentric sleeve (436) are circumferentially fixed with the rotating shaft (432a). The transmission wheel (432) can rotate along the central axis of the middle part thereof, and drives the eccentric sleeve (436) to rotate through the rotating shaft (432a), so as to drive the lifting plate (434) to move up and down.

2. The eccentric drive structure of claim 1, wherein: The eccentric hole (4361) and the rotating shaft (432a) and the central hole and the rotating shaft (432a) are connected through keys, so that the transmission wheel (432) and the eccentric sleeve are circumferentially fixed with the rotating shaft (432a).

3. An eccentric drive structure according to claim 2, wherein: The eccentric hole (4361) and the rotating shaft (432a) and the central hole and the rotating shaft (432a) are connected through keys.

4. The eccentric drive structure of claim 2, wherein: The eccentric hole (4361) and the rotating shaft (432a) and the central hole and the rotating shaft (432a) are connected through keys.

5. The eccentric drive structure of claim 1, wherein: The rotating shaft hole is provided with a joint bearing (437), and the joint bearing (437) is sleeved on the outer wall of the eccentric sleeve (436).

6. The eccentric drive structure of claim 1, wherein: The rotating shaft hole of the connecting rod (433) is provided with end covers (44) which seal the rotating shaft hole.

7. The eccentric drive structure of claim 5, wherein: The rotating shaft hole of the connecting rod (433) is provided with end covers (44) which seal the rotating shaft hole, the outer wall of the eccentric sleeve (436) is provided with two snap spring grooves (4362) which correspond to the positions of the two ends of the joint bearing (437), the snap spring grooves (4362) are provided with stop washers (45), and the two stop washers (45) are respectively pressed by the two end covers (44), so as to limit the axial movement of the joint bearing (437).

8. The eccentric drive structure of claim 1, wherein: The eccentric sleeve (436) is made of metal or plastic.

9. The eccentric drive structure of claim 1, wherein: The eccentric hole (4361) and the rotating shaft hole form an eccentric distance between the centers thereof, and the size range of the eccentric distance is 3mm-12mm.

Images