A drum device for easy adjustment

Abstract

The application discloses a kind of convenient adjustment's roller device, this device includes shaft sleeve assembly, transmission assembly and telescopic component, shaft sleeve assembly is equipped with two opposite faces of radial and axial, its radial opposite face is first end face and second end face, its axial opposite face is outer diameter surface and inner diameter surface;Transmission assembly includes first gear ring and second gear ring, is set to outer diameter surface, it is annular, and driven gear meshing transmission with first gear ring and second gear ring;Telescopic component, it includes shell, with the cover of shell cooperation connection, be set to telescopic rod in shell, be set to sliding rack in telescopic rod one end, and with sliding rack meshing transmission limit gear, through the ingenious design of shaft sleeve assembly, transmission assembly and telescopic component, reach to the support effect inside cylinder body, improve the service life of roller, reduce the cylinder body open weld, shaft head fracture and other failures of roller, save cost.

Description

Technical Field

[0001] This invention relates to the field of conveyor roller technology, and more particularly to a roller device that is easy to adjust. Background Technology

[0002] Belt conveyors, also known as rubber belt conveyors, are continuous-movement transportation equipment that uses a conveyor belt as both a traction and load-bearing mechanism. They are widely used in coal mines and many other places. Belt conveyors have advantages such as long conveying distance, large conveying capacity, and continuous conveying. They are also reliable in operation and easy to automate and centrally control. Belt conveyors have become key equipment for efficient coal mining.

[0003] Currently, the drum body and end plates of the mining belt conveyor rollers used in the coal industry are connected by welding. During use, problems such as wear and detachment of the outer rubber layer, weld breakage of the drum body, and shaft breakage may occur. Once the drum body is damaged, the entire drum body needs to be replaced, which is costly. Therefore, it is necessary to redesign a drum device that is easy to adjust. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the rollers of the current belt conveyor, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide an easily adjustable roller device, which aims to improve the existing belt conveyor rollers that have problems such as weld cracking and shaft breakage.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an adjustable roller device, which includes a bushing assembly, a transmission assembly, and a telescopic assembly. The bushing assembly has two opposing surfaces, one radial and one axial. The radial opposing surfaces are a first end face and a second end face, and the axial opposing surfaces are an outer diameter surface and an inner diameter surface. The transmission assembly includes a first gear ring and a second gear ring disposed on the outer diameter surface, which are annular, and a driven gear that meshes with the first gear ring and the second gear ring. The telescopic assembly includes a housing, a cover plate that mates with the housing, a telescopic rod disposed within the housing, a sliding rack disposed at one end of the telescopic rod, and a limiting gear that meshes with the sliding rack.

[0008] As a preferred embodiment of the adjustable roller device of the present invention, it further includes: a roller assembly, the roller assembly including an outer cylinder, a main shaft disposed inside the outer cylinder, and a sleeve sleeved on the main shaft; the outer cylinder is open at both ends in the axial direction, a web is provided on the inner diameter surface of the outer cylinder and distributed at the openings at both ends of the outer cylinder, a blocking plate is sleeved on the main shaft, the blocking plate is bolted to the web, and the central shaft portion of the bushing assembly has a through hole and is sleeved on the sleeve.

[0009] As a preferred embodiment of the adjustable roller device of the present invention, the first toothed ring and the second toothed ring are the same in shape and size; the first toothed ring and the second toothed ring are radially symmetrical about the bushing assembly; a bearing is sleeved in the middle of the first toothed ring and the second toothed ring; and the cover plate is connected to the bearing.

[0010] As a preferred embodiment of the adjustable roller device of the present invention, the sleeve has a diameter smaller than the diameter of the bushing assembly, and a movable hole is provided on the side wall on the same side as the first end face. A movable rod is provided in the movable hole, and a locking key is provided at the end of the movable rod away from the movable hole. A locking groove is provided on the first end face, and the locking key can be inserted into the locking groove.

[0011] As a preferred embodiment of the adjustable roller device of the present invention, the main shaft is fitted with a large gear, the central shaft of the large gear is provided with a rotating disk, and a rotating rod is provided on the side wall of the rotating disk away from the large gear; a rotating hole is opened on the side wall of the first gear ring and axially penetrates the second gear ring, and the rotating rod can cooperate to penetrate into the rotating hole.

[0012] As a preferred embodiment of the adjustable roller device of the present invention, the housing has openings at both ends in the radial direction; a cavity is formed inside the housing; a limiting groove is formed in the radial direction at the top of the housing; a sliding groove is formed in the radial direction at the bottom of the cavity; the sliding rack can slide in the sliding groove; and the length of the sliding groove is greater than the length of the limiting groove.

[0013] As a preferred embodiment of the adjustable roller device of the present invention, the limiting gear is provided with a limiting rod on its edge, and the limiting rod can be engaged in the limiting through groove; the limiting gear is provided with a fixed shaft in the middle, and the fixed shaft is axially connected to the housing.

[0014] As a preferred embodiment of the adjustable roller device of the present invention, the telescopic rod is divided into a front telescopic rod, a middle telescopic rod, and a rear telescopic rod, the three sections having different thicknesses and being connected in sequence; the front telescopic rod extends out of the opening of the housing and is provided with a baffle plate; a spring is sleeved on the middle telescopic rod; the rear telescopic rod is connected to the sliding rack, and one end of the spring is connected to the end face of the rear telescopic rod away from the sliding rack.

[0015] As a preferred embodiment of the adjustable roller device of the present invention, wherein: a convex ring is provided at the opening of the housing away from the cover plate, the end of the spring away from the rear telescopic rod is connected to the convex ring, a rotating groove is provided on the side wall of the limiting gear and is symmetrically arranged about the limiting gear; a through hole is provided on the side wall of the housing and is radially symmetrical about the housing, a rotating rod is provided at the through hole, the rotating rod can be inserted into the rotating groove, and friction textures are provided on the rotating groove and the rotating rod.

[0016] As a preferred embodiment of the easily adjustable roller device of the present invention, wherein: the end of the rotating rod away from the rotating groove is fitted with a driven gear, and is radially symmetrical about the bushing assembly.

[0017] The beneficial effects of this invention are:

[0018] This invention connects the end plate and the cylinder web plate using mechanical bolt connections, reducing the cost of replacing roller parts. Roller parts can be disassembled without damage, making the parts interchangeable. The bolt connection uses an interference fit between the bolt thread and the holes in the end plate and web plate, improving the safety factor of the bolts and ensuring the quality of roller use. Furthermore, the ingenious design of the bushing assembly, transmission assembly, and telescopic assembly achieves a supporting effect on the inside of the cylinder, improving the service life of the roller, reducing failures such as cylinder weld cracking and shaft breakage, and saving costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a schematic diagram of the overall structure of the roller assembly of the roller device that is easy to adjust according to the present invention.

[0021] Figure 2 This is a cross-sectional view of the overall structure of the roller assembly of the roller device of the present invention, which is easy to adjust.

[0022] Figure 3This is an isometric side view of the roller device bushing assembly, transmission assembly, and telescopic assembly of the present invention, which are designed for easy adjustment.

[0023] Figure 4 This is an exploded view of the overall structure of the adjustable roller device bushing assembly, transmission assembly, and telescopic assembly of the present invention.

[0024] Figure 5 This is a schematic diagram of the overall structure of the roller device bushing assembly that is easy to adjust according to the present invention.

[0025] Figure 6 This is a front view of the overall structure of the adjustable roller device bushing assembly, transmission assembly, and telescopic assembly of the present invention.

[0026] Figure 7 This is an exploded view of the overall structure of the telescopic assembly of the easily adjustable roller device of the present invention.

[0027] Figure 8 This is a cross-sectional view of the telescopic assembly housing of the roller device according to the present invention, which is easy to adjust. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0031] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0032] Example 1

[0033] Reference Figures 1 to 8The first embodiment of the present invention provides an easily adjustable roller device, which includes a bushing assembly 100, a transmission assembly 200, and a telescopic assembly 300. The bushing assembly 100 is the part of the roller device that is mounted on the main shaft 402 and is connected and assembled with the transmission assembly 200. The transmission assembly 200 is the main drive part of the roller device, which allows the operator to rotate multiple roller devices at the same time. The telescopic assembly 300 provides support for the rollers and can accommodate multiple sets.

[0034] Specifically, the bushing assembly 100 has two opposing surfaces, radial N and axial M. The opposing surfaces of radial N are the first end face 101 and the second end face 102, and the opposing surfaces of axial M are the outer diameter surface 103 and the inner diameter surface 104. The transmission assembly 200 includes a first gear ring 201 and a second gear ring 202, which are disposed on the outer diameter surface 103 and are annular, and a driven gear 203 that meshes with the first gear ring 201 and the second gear ring 202 for transmission.

[0035] Among them, the bushing assembly 100 with two opposing surfaces, radial N and axial M, has no directional requirements for the first end face 101 and the second end face 102 when it is installed on the main shaft 402, thereby improving assembly efficiency, reducing error prevention steps, facilitating installation by workers, and saving production costs. It should be noted that for the first or last roller device installed, the first end face 101 should be placed facing outwards during installation, thereby improving work efficiency.

[0036] Furthermore, the first gear ring 201 and the second gear ring 202 rotate synchronously, which can simultaneously drive the driven gear 203 to rotate, thereby driving multiple sets of telescopic components 300 to extend and retract, and in turn driving multiple sets of roller devices to work, further improving work efficiency and saving time.

[0037] Specifically, the telescopic assembly 300 includes a housing 301, a cover plate 302 that is connected to the housing 301, a telescopic rod 303 disposed in the housing 301, a sliding rack 304 disposed at one end of the telescopic rod 303, and a limiting gear 305 that meshes with the sliding rack 304 for transmission.

[0038] Furthermore, multiple sets of telescopic components 300 can be placed, the housing 301 is bolted to the cover plate 302 and can be detached and installed, and the number of gears of the sliding rack 304 can mesh with the number of gears of the limiting gear 305 for transmission.

[0039] Example 2

[0040] Reference Figures 1 to 8This is the second embodiment of the present invention, which differs from the first embodiment in that it further includes a roller assembly 400. The roller assembly 400 includes an outer cylinder 401, a main shaft 402 disposed inside the outer cylinder 401, and a sleeve 403 sleeved on the main shaft 402. The outer cylinder 401 is open at both ends in the axial direction M. A web plate 401a is provided on the inner diameter surface of the outer cylinder 401 and is distributed at the openings at both ends of the outer cylinder 401. A blocking plate 401b is sleeved on the main shaft 402 and is bolted to the web plate 401a. The central shaft portion of the bushing assembly 100 has a shaft through hole 105 and is sleeved on the sleeve 403.

[0041] Furthermore, the traditional welding connection process of the roller is designed as two parts: a web plate 401a and a blocking plate 401b on the outer cylinder 401. The web plate 401a and the blocking plate 401b are connected by bolts, which avoids the risk of weld failure of the outer cylinder 401. If the outer cylinder 401 or the blocking plate 401b is damaged, only the bolts need to be removed and the damaged part replaced. There is no need to replace the entire roller, which greatly saves costs. The easy disassembly design makes the roller parts replaceable.

[0042] Specifically, the first toothed ring 201 and the second toothed ring 202 have the same shape and size; wherein, the first toothed ring 201 and the second toothed ring 202 are radially symmetrical about the bushing assembly 100, and a bearing 204 is sleeved in the middle of the first toothed ring 201 and the second toothed ring 202, and the cover plate 302 is connected to the bearing 204.

[0043] Specifically, the width of the sleeve 403 is smaller than the width of the bushing assembly 100, and a moving hole 403a is provided on the side wall on the same side as the first end face 101. A moving rod 403b is provided in the moving hole 403a, and a locking key 205 is provided at the end of the moving rod 403b away from the moving hole 403a. A locking groove 101a is provided on the first end face 101, and the locking key 205 can be inserted into the locking groove 101a.

[0044] Furthermore, the first gear ring 201 and the second gear ring 202 are arranged side by side, which can simultaneously drive the driven gear 203 to rotate, while the bearing 204 between the first gear ring 201 and the second gear ring 202 is not affected, keeping the telescopic component 200 and the outer cylinder 401 rotating synchronously and relatively stationary.

[0045] When the first toothed ring 201 and the second toothed ring 202 are rotated clockwise or counterclockwise at the same time, the operator can pull out the moving rod 403b in the moving hole 403a, so that the locking key 205 is outside the slot 101a, which does not affect the rotation of the first toothed ring 201 and the second toothed ring 202. When the locking key 205 is inside the slot 101a, the first toothed ring 201 and the second toothed ring 202 are locked, thereby achieving the effect of fixing multiple sets of roller devices. It should be noted that only the first set of roller devices or the last set of roller devices has the locking key 205 and the slot 101a. Only one set of roller devices is needed to drive the other roller devices.

[0046] A large gear 206 is fitted on the main shaft 402. A rotating disk 207 is provided on the central shaft of the large gear 206. A rotating rod 207a is provided on the side wall of the rotating disk 207 away from the large gear 206. A rotating hole 101b is provided on the side wall of the first gear ring 201, and the axial direction M passes through the second gear ring 202. The rotating rod 207a can be fitted through the rotating hole 101b.

[0047] Furthermore, this roller device can accommodate multiple sets. The actual placement depends on the length of the outer cylinder 401 of the roller. The rotating rod 207a can connect multiple sets of roller devices through the rotating hole 101b, thereby achieving the effect of multiple sets of roller devices rotating simultaneously, thus improving work efficiency.

[0048] The remaining structure is the same as that in Example 1.

[0049] Example 3

[0050] Reference Figures 1 to 8 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the housing 301 has openings at both ends in the radial N direction; wherein, a cavity 301a is formed inside the housing 301, a limiting through groove 301b is formed in the radial N direction at the top of the housing 301, a sliding groove 301c is formed in the radial N direction at the bottom of the cavity 301a, the sliding rack 304 can slide in the sliding groove 301c, and the length of the sliding groove 301c is greater than the length of the limiting through groove 301b.

[0051] Specifically, the edge of the limiting gear 305 is provided with a limiting rod 305a, which can be engaged in the limiting through groove 301b; wherein, the middle part of the limiting gear 305 is provided with a fixed shaft 305b, and the fixed shaft 305b is connected to the housing 301 in the M direction.

[0052] Furthermore, the length of the sliding groove 301c is greater than the length of the limiting through groove 301b, so that the sliding rack 304 has enough space to push out the telescopic rod 303, avoiding the gap left when the baffle plate 303a-1 is in contact with the inner diameter surface of the outer cylinder 401; while the design of the limiting rod 305a avoids the telescopic rod 303 from extending all the way out, causing the baffle plate 303a-1 to be squeezed against the inner diameter surface of the outer cylinder 401, thus avoiding damage to the outer cylinder 401.

[0053] Specifically, the telescopic rod 303 is divided into a front telescopic rod 303a, a middle telescopic rod 303b, and a rear telescopic rod 303c, which are of different thicknesses and connected in sequence. The front telescopic rod 303a extends out of the opening of the housing 301 and is provided with a baffle plate 303a-1. The middle telescopic rod 303b is fitted with a spring 303b-1. The rear telescopic rod 303c is connected to the sliding rack 304, and one end of the spring 303b-1 is connected to the end face of the rear telescopic rod 303c away from the sliding rack 304.

[0054] Specifically, a convex ring 301d is provided at the opening of the housing 301 away from the cover plate 302. The end of the spring 303b-1 away from the rear telescopic rod 303c is connected to the convex ring 301d. A rotating groove 305c is provided on the side wall of the limiting gear 305, and is symmetrically arranged about the limiting gear 305. A through hole 301e is provided on the side wall of the housing 301, and is symmetrical about the radial direction N of the housing 301. A rotating rod 301e-1 is provided at the through hole 301e. The rotating rod 301e-1 can be inserted into the rotating groove 305c. Friction patterns are provided on both the rotating groove 305c and the rotating rod 301e-1.

[0055] The driven gear 203 is sleeved on the end of the rotating rod 301e-1 away from the rotating groove 305c, and is radially symmetrical about the bushing assembly 100.

[0056] Furthermore, when the telescopic rod 303 extends, the convex ring 301d compresses the spring 303b-1 on the middle section of the telescopic rod 303b, thereby limiting the telescopic rod 303. When the telescopic rod 303 retracts, the elastic force of the spring 303b-1 accelerates the reset speed of the telescopic rod 303, thus improving work efficiency.

[0057] Furthermore, the friction patterns (not labeled in the attached diagram) on the rotating groove 305c and the rotating rod 301e-1 increase the friction force of the rotating rod 301e-1 rotating within the rotating groove 305c, thereby improving the rotational efficiency of the limit gear 305. The meshing design of the friction patterns on the rotating groove 305c and the rotating rod 301e-1 prevents the rotating rod 301e-1 from easily sliding within the rotating shaft groove 305c, requiring external force to twist it for movement. This also prevents the telescopic rod 303 from rebounding into the cavity 301a using the elastic force of the spring 303b-1, thus improving the work efficiency of the operators.

[0058] The remaining structure is the same as that in Example 2.

[0059] Combined with appendix Figures 1 to 8 As shown, during installation, the bolts on the web plates 401a and the blocking plates 401b at both ends of the outer cylinder 401 are unscrewed and disassembled. The main shaft 402 is taken out from the outer cylinder 401. Then, the sleeve 403 is horizontally aligned with the main shaft 402, and the main shaft 402 is slowly inserted into the sleeve 403. Next, the bushing assembly 100 is put on the sleeve 403, and the cover plate 302 of the telescopic assembly 200 is connected to the bearing 204. At this time, the first gear ring 201 and the second gear ring 202 mesh with the driven gear 203 for transmission.

[0060] During operation, the operator places the large gear 206 and the rotating disk 207 onto the main shaft 402. The rotating rod 207a on the rotating disk 207 is then assembled and inserted into the rotating hole 101b to simultaneously fix and rotate multiple sets of roller devices. Subsequently, the operator begins to rotate the large gear 206 clockwise. The large gear 206 drives the rotating disk 207 and the rotating rod 207a to rotate clockwise. At this time, the first gear ring 201 and the second gear ring 202 drive the driven gear 203 to rotate counterclockwise, and also rotate the rotating rod 301e-1. The rotating rod 301e-1 rotates along the friction pattern in the rotating groove 305c under the drive of the driven gear 203.

[0061] On one hand, the limiting gear 305 begins to rotate, causing the sliding rack 304, which meshes with the limiting gear 305, to slide within the sliding groove 301c. On the other hand, the sliding rack 304 begins to push the telescopic rod 303 to move within the cavity 301a, extending the stop plate 303a-1. When the limiting rod 305a rotates from the rightmost to the leftmost position within the limiting through groove 301b (it should be noted that in the initial state of the telescopic assembly 300, the limiting rod 305a is in the rightmost position), the limiting... Gear 305 stops rotating, sliding rack 304 stops sliding, telescopic rod 303 stops moving, and spring 303b-1 is in a compressed state. At this time, the worker pushes the locking key 205 into the locking groove 101a, locking the first gear ring 201 and the second gear ring 202, so that the rotating rod 207a cannot rotate. On the other hand, the baffle plate 303a-1 and the inner diameter surface of the outer cylinder 401 are in contact with each other, and the worker stops rotating the large gear 206. Finally, the web plate 101a and the blocking plate 101b are bolted together to complete the installation.

[0062] When disassembly is required, pull the key 205 out of the slot 101a. At this time, the first gear ring 201 and the second gear ring 202 resume rotation, and the rotating rod 207a can also continue to rotate. The operator rotates the large gear 206 counterclockwise, which in turn rotates the first gear ring 201 and the second gear ring 202 counterclockwise, thereby driving the driven gear 203 to rotate clockwise. At this time, the stop plate 303a-1 retracts.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An easily adjustable roller device, characterized in that: include, The bushing assembly (100) has two opposing surfaces, radial (N) and axial (M). The opposing surfaces of its radial (N) are the first end face (101) and the second end face (102), and the opposing surfaces of its axial (M) are the outer diameter surface (103) and the inner diameter surface (104). The transmission assembly (200) includes a first gear ring (201) and a second gear ring (202) disposed on the outer diameter surface (103) and being annular, and a driven gear (203) meshing with the first gear ring (201) and the second gear ring (202); and, The telescopic assembly (300) includes a housing (301), a cover plate (302) connected to the housing (301), a telescopic rod (303) disposed in the housing (301), a sliding rack (304) disposed at one end of the telescopic rod (303), and a limiting gear (305) meshing with the sliding rack (304). It also includes a roller assembly (400), which includes an outer cylinder (401), a main shaft (402) disposed inside the outer cylinder (401), and a sleeve (403) sleeved on the main shaft (402). The outer cylinder (401) has openings at both ends in the axial (M) direction. The inner diameter surface of the outer cylinder (401) is provided with a web plate (401a) and distributed at the openings at both ends of the outer cylinder (401). A blocking plate (401b) is sleeved on the main shaft (402). The blocking plate (401b) is bolted to the web plate (401a). The central shaft of the bushing assembly (100) has a shaft through hole (105) and is sleeved on the sleeve (403). The sleeve (403) is narrower than the bushing assembly (100), and a movable hole (403a) is provided on the side wall on the same side as the first end face (101). A movable rod (403b) is provided in the movable hole (403a), and a locking key (205) is provided at the end of the movable rod (403b) away from the movable hole (403a). A slot (101a) is provided on the first end face (101), and the key (205) can be inserted into the slot (101a); A large gear (206) is sleeved on the main shaft (402), and a rotating disk (207) is provided on the central shaft of the large gear (206). A rotating rod (207a) is provided on the side wall of the rotating disk (207) away from the large gear (206). The first toothed ring (201) has a rotating hole (101b) on its side wall and passes through the second toothed ring (202) axially (M). The rotating rod (207a) can be inserted into the rotating hole (101b). The housing (301) has openings at both ends in the radial (N) direction; The housing (301) has a cavity (301a) inside. A limiting groove (301b) is formed in the radial (N) direction at the top of the housing (301). A sliding groove (301c) is formed in the radial (N) direction at the bottom of the cavity (301a). The sliding rack (304) can slide in the sliding groove (301c) and the length of the sliding groove (301c) is greater than the length of the limiting groove (301b).

2. The easily adjustable roller device according to claim 1, characterized in that: The first toothed ring (201) and the second toothed ring (202) have the same shape and size; The first toothed ring (201) and the second toothed ring (202) are radially (N) symmetrical about the bushing assembly (100), and a bearing (204) is sleeved between the first toothed ring (201) and the second toothed ring (202), and the cover plate (302) is connected to the bearing (204).

3. The easily adjustable roller device according to claim 2, characterized in that: The edge of the limiting gear (305) is provided with a limiting rod (305a), which can be engaged in the limiting through groove (301b). The limiting gear (305) has a fixed shaft (305b) in the middle, and the fixed shaft (305b) is connected to the housing (301) in the axial (M) direction.

4. The easily adjustable roller device according to claim 3, characterized in that: The telescopic rod (303) is divided into a front telescopic rod (303a), a middle telescopic rod (303b), and a rear telescopic rod (303c), which are of different thicknesses and are connected in sequence. The front telescopic rod (303a) extends out of the opening of the housing (301) and is provided with a baffle plate (303a-1). The middle telescopic rod (303b) is fitted with a spring (303b-1). The rear telescopic rod (303c) is connected to the sliding rack (304). One end of the spring (303b-1) is connected to the end face of the rear telescopic rod (303c) away from the sliding rack (304).

5. The easily adjustable roller device according to claim 4, characterized in that: The housing (301) has a protruding ring (301d) at the opening at the end away from the cover plate (302). The end of the spring (303b-1) away from the rear telescopic rod (303c) is connected to the protruding ring (301d). The side wall of the limiting gear (305) has a rotating groove (305c) and is symmetrically arranged about the limiting gear (305). The side wall of the housing (301) is provided with a through hole (301e) and is symmetrical about the radial (N) direction of the housing (301). A rotating rod (301e-1) is provided at the through hole (301e). The rotating rod (301e-1) can be inserted into the rotating groove (305c). Both the rotating groove (305c) and the rotating rod (301e-1) are provided with friction texture.

6. The easily adjustable roller device according to claim 5, characterized in that: The end of the rotating rod (301e-1) away from the rotating groove (305c) is fitted with a driven gear (203) and is radially (N) symmetrical about the bushing assembly (100).

Images