CN216189560U - Tightness adjusting mechanism - Google Patents

Abstract

The embodiment of the utility model discloses a tightness adjusting mechanism which comprises a mounting frame and at least two roller assemblies, wherein the mounting frame is provided with a first mounting hole; the adjustable roller assembly comprises a first installation shaft, a first roller and a cam, the first roller is sleeved outside the first installation shaft and is rotatably connected with the first installation shaft, the cam is connected with the first installation shaft, and the cam is arranged in the first installation hole and can rotate in the first installation hole to adjust the position of the first installation shaft. The tightness adjusting mechanism provided by the embodiment of the utility model can adjust the position of the adjustable roller component by rotating the cam, so that the gap between two adjacent roller components is adjusted, and the tightness adjusting function is realized; meanwhile, the tightness adjusting mechanism provided by the embodiment of the utility model has the advantages of simple structure and convenience in maintenance.

Description

Tightness adjusting mechanism

Technical Field

The utility model relates to the field of production and processing equipment, in particular to an elasticity adjusting mechanism.

Background

The roll of flexible material is used in manufacturing industries in a very wide range of applications. However, during the production or use of the roll, the thickness of the roll may change as the flexible material is wound or pulled out; at the same time, different rolls also have different thicknesses. Therefore, a tightness adjusting mechanism is required to be arranged, and tightness adjustment is carried out according to the thickness of the coil stock, so that the coil stock is convenient to produce or use.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model aims to provide a tightness adjusting mechanism which is convenient for tightness adjustment of a coil stock.

The tightness adjusting mechanism comprises a mounting frame and at least two roller assemblies; the mounting frame is provided with a first mounting hole; the roller components are connected with the mounting frame, and at least one of the roller components is an adjustable roller component; the adjustable roller assembly comprises a first installation shaft, a first roller and a cam, the first roller is sleeved outside the first installation shaft and is rotatably connected with the first installation shaft, the cam is connected with the first installation shaft, and the cam is arranged in the first installation hole and can rotate in the first installation hole so as to adjust the position of the first installation shaft.

Further, the mounting frame is also provided with a guide hole, and the first mounting shaft part is arranged in the guide hole in a penetrating mode and can move along the radial direction of the guide hole.

Further, the first mounting hole is provided between the guide hole and the first drum.

Further, the guiding hole is an oblong hole, the tightness adjusting mechanism further comprises a locking piece, the locking piece comprises a limiting screw, the limiting screw penetrates through the side wall of the first mounting hole and is opposite to the side face of the cam, the extending direction of the limiting screw is the same as the length direction of the guiding hole, and the limiting screw is configured to abut against the side face of the cam to lock the cam.

Further, the mounting frame comprises two mounting plates and at least one connecting piece; the two mounting plates are oppositely arranged at intervals, the first mounting hole is formed in the mounting plates, and the two mounting plates support the roller assembly together; the connecting piece is connected with the two mounting plates.

Furthermore, the adjustable roller assembly comprises two cams, the two cams are arranged corresponding to two ends of the first roller and are symmetrical; the first mounting holes of the two mounting plates correspond to the cams one by one, and the two cams of the adjustable roller assembly are arranged in the corresponding first mounting holes of the two mounting plates respectively.

Further, the mounting frame is also provided with a second mounting hole, at least one of the roller assemblies is a fixed roller assembly, the position of the fixed roller assembly is fixed relative to the mounting frame, and the fixed roller assembly comprises a second mounting shaft and a second roller; the second mounting shaft is connected with the second mounting hole; the second roller is sleeved outside the second mounting shaft.

Further, the second mounting shaft is rotatably connected with the second mounting hole, and the second roller is circumferentially and fixedly connected with the second mounting shaft; or the second mounting shaft is circumferentially and fixedly connected with the second mounting hole, and the second roller is rotatably connected with the second mounting shaft.

Further, the slack adjustment mechanism also includes a lock configured to lock the cam and/or the first mounting shaft.

Further, the tightness adjusting mechanism further comprises a handle fixed at one end of the first mounting shaft.

The embodiment of the utility model provides a tightness adjusting mechanism which comprises a mounting frame and at least two roller assemblies, wherein the mounting frame is provided with a first mounting hole; the adjustable roller assembly comprises a first installation shaft, a first roller and a cam, the first roller is sleeved outside the first installation shaft and is rotatably connected with the first installation shaft, the cam is connected with the first installation shaft, and the cam is arranged in the first installation hole and can rotate in the first installation hole to adjust the position of the first installation shaft. The tightness adjusting mechanism provided by the embodiment of the utility model can adjust the position of the adjustable roller component by rotating the cam, so that the gap between two adjacent roller components is adjusted, and the tightness adjusting function is realized; meanwhile, the tightness adjusting mechanism provided by the embodiment of the utility model has the advantages of simple structure and convenience in maintenance.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

FIG. 1 is a schematic perspective view of a tightness adjustment mechanism according to an embodiment of the present invention;

FIG. 2 is an exploded view of the tightness adjustment mechanism of an embodiment of the present invention;

FIG. 3 is a top view of a slack adjustment mechanism of an embodiment of the present invention;

FIG. 4 is a left side view of the tightness adjustment mechanism of an embodiment of the present invention;

FIG. 5 is a schematic view of an operating condition of the slack adjustment mechanism of the embodiment of the present invention;

FIG. 6 is a schematic view of another operating condition of the tightness adjustment mechanism of the embodiment of the present invention;

FIG. 7 is a schematic perspective view of an adjustable roller assembly according to an embodiment of the present invention;

FIG. 8 is a front view of an adjustable roller assembly according to an embodiment of the present invention;

FIG. 9 is a left side view of an adjustable roller assembly according to an embodiment of the present invention;

FIG. 10 is an enlarged fragmentary view at B in the schematic view showing an operating state of the tension adjusting mechanism according to the embodiment of the present invention;

FIG. 11 is an enlarged fragmentary view at C of the schematic view showing another operating condition of the tension adjusting mechanism of the embodiment of the present invention;

FIG. 12 is a front view of a mounting plate of an embodiment of the present invention;

FIG. 13 is a cross-sectional view of a mounting plate of an embodiment of the present invention taken along plane D-D.

Description of reference numerals:

100-a mounting frame; 110-a mounting plate; 111-a first mounting hole; 112-a pilot hole; 113-a second mounting hole; 120-a connector;

200-an adjustable roller assembly; 210-a first drum; 220-first installation axis; 230-a cam;

300-fixing the roller assembly; 310-a second drum; 320-a second mounting shaft;

400-a locking element; 410-limit screws;

500-a handle;

600-a bearing;

700-bearing.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

When an element or layer is referred to as being "on," "engaged to," "connected to" or "coupled to" another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer or intervening elements or layers may be present.

Fig. 1 to 4 are a schematic perspective view, an exploded view, a top view and a left side view of a tightness adjusting mechanism according to an embodiment of the present invention.

Referring to fig. 1-4, the slack adjustment mechanism includes a mounting bracket 100 and at least two roller assemblies 200, 300. The roller assemblies 200, 300 are coupled to the mounting frame 100 and are capable of rotating. The number of the roller assemblies 200, 300 is set as desired, with a gap between adjacent roller assemblies 200, 300. Flexible materials such as film, rope, etc. can be wound around or attached to the periphery of the roller assemblies 200, 300. The roll material may be placed over the roller assembly 200, 300 for access or the roller assembly 200, 300 may be formed into a roll by winding the flexible material.

In this embodiment, at least one of the roller assemblies 200, 300 is an adjustable roller assembly 200, and the position of the adjustable roller assembly 200 on the mounting frame 100 is adjustable. The position of the adjustable roller assembly 200 can be adjusted according to the thickness of the roll material, so that the gap between two adjacent roller assemblies 200 and 300 can be adjusted, and the roll material can be taken or wound conveniently. The tightness adjusting mechanism can be applied to the scenes of labeling, sticking a protective film, supplying paper by printing equipment, taking steel coils and the like.

Fig. 5 and 6 are schematic views of two different operating states of the tightness-adjusting mechanism according to the embodiment of the present invention. Wherein fig. 5 is a schematic view taken along the plane a-a in fig. 4, and the sectional position of fig. 6 corresponds to fig. 5. In fig. 5 and 6, adjacent roller assemblies 200, 300 have different gaps therebetween.

Referring to fig. 1-6, the adjustable roller assembly 200 includes a first roller 210, a first mounting shaft 220, and a cam 230. The first roller 210 is sleeved outside the first mounting shaft 220 and is rotatably connected to the first mounting shaft 220, and the first roller 210 can rotate with the first mounting shaft 220 as a rotation axis. The cam 230 is coupled to the first mounting shaft 220. The mounting block 100 has a first mounting hole 111, and the cam 230 is disposed in the first mounting hole 111 and can rotate in the first mounting hole 111. Comparing fig. 5 and 6, when the cam 230 is rotated to different positions, the position of the first mounting shaft 220 relative to the center of the first mounting hole 111 is changed, thereby enabling adjustment of the position of the adjustable roller assembly 200 and thus the gap between two adjacent roller assemblies 200, 300.

Fig. 7-9 are a perspective view, a front view and a left view, respectively, of an adjustable roller assembly according to an embodiment of the present invention.

Referring to fig. 1 to 9, the shape of the first roller 210 is set according to the requirements of a specific application scenario of the slack adjuster, and the shape of the first roller 210 is not limited in the embodiment of the present invention. The first roller 210 may be configured as a cylinder, a prism, a cone, or other shapes according to different application scenarios. In the present embodiment, the first roller 210 is a cylindrical drum.

Fig. 10 is a partial enlarged view of fig. 5 at B, and fig. 11 is a partial enlarged view of fig. 6 at C.

Referring to fig. 5-11, the first roller 210 may be rotatably coupled to the first mounting shaft 220 in various ways, such as by bearings, bushings, or other rotational couplings 120 that enable radial positioning of the first roller 210. In the present embodiment, the first drum 210 is coupled with the first mounting shaft 220 by a bearing 700. After the first drum 210 is connected to the first mounting shaft 220 by the bearing 700, the bearing 700 may be axially positioned by a shaft retainer ring, a lock nut, a bearing end cover, etc., so as to prevent the first drum 210 from axial displacement.

The shape and size of the cam 230 may be configured as desired for positional adjustment of the adjustable roller assembly 200. The outer profile of the cam 230 may be elliptical, circular, oval, or other shapes, and embodiments of the present invention limit the shape of the cam 230. In some embodiments, the cam 230 is an eccentric, i.e., the outer profile of the cam 230 is circular, and the position of the first mounting shaft 220 is offset from the center of the cam 230.

The rotation of the cam 230 may be driven by a driving member such as a motor or may be driven by a human power. In one embodiment, referring to FIGS. 1-6, the slack adjustment mechanism further includes a handle 500, the handle 500 being secured to one end of the first mounting shaft 220. By rotating the handle 500, the cam 230 can be rotated. The shape of the handle 500 can be freely set as required, and the present embodiment does not limit the shape of the handle 500. In another embodiment, a motor may be provided to drive the cam to rotate to achieve automatic adjustment of the tightness of the web.

The position of the first mounting shaft 220 relative to the center axis of the cam 230 is fixed, and when the cam 230 rotates about the center axis, the orientation of the first mounting shaft 220 relative to the center axis of the cam 230 changes. The cam 230 may be fixedly coupled to the first mounting shaft 220. In one embodiment, referring to fig. 5-9, the cam 230 is an eccentric having a shaft hole corresponding to the first mounting shaft 220, and the first mounting shaft 220 is inserted into the shaft hole and fixed. The cam 230 and the first mounting shaft 220 may be fixed by key connection, screw connection, welding, interference fit, etc.

The first mounting hole 111 is shaped and sized to accommodate the cam 230 such that the cam 230 can rotate within the first mounting hole 111. The first mounting hole 111 may be larger than the cam 230 or may be the same size as the cam 230, as needed for the position adjustment range of the adjustable roller assembly 200. In one embodiment, the first mounting holes 111 are substantially the same in shape and size, and the cam 230 can rotate in the first mounting holes 111 about the central axis of the cam 230 without moving radially; thus, when the cam 230 rotates, the first mounting shaft 220 moves about the central axis of the cam 230, whereby the position of the first roller 210 can be changed to adjust the gap between two adjacent roller assemblies. In another embodiment, referring to fig. 5-6 and 10-11, the first mounting hole 111 is larger than the cam 230, the cam 230 can rotate in the first mounting hole 111, and the rotation axis of the cam 230 can be offset from the center axis of the cam 230, such as by rotating the first mounting shaft 220 to rotate the cam 230.

In some embodiments, the slack adjustment mechanism also has a lock 400 for locking the cam 230 and/or the first mounting shaft 220. The locking member 400 may lock the cam 230, or the first mounting shaft 220, or both the cam 230 and the first mounting shaft 220. After adjusting the position of the adjustable roller assembly 200, the adjustable roller assembly 200 may be locked by the locking member 400. Thereby preventing the adjustable roller assembly 200 from being displaced during operation while ensuring the normal rotation of the first roller 210.

The locking member 400 may perform the locking function in a variety of ways, such as by magnetically attracting, fastening, snapping, etc., the cam 230 and/or the first mounting shaft 220 may be locked. In one embodiment, the locking member 400 is a magnet disposed on a sidewall of the first mounting hole 111, and the cam 230 is provided with a plurality of iron blocks corresponding to the magnet at intervals. When the cam 230 rotates to a predetermined position, the magnet may be attracted to the iron to fix the cam 230, thereby allowing the cam 230 to be fixed to a certain extent at a predetermined plurality of positions (depending on the position of the iron on the cam 230). The position of the adjustable roller assembly 200 may be adjusted by applying a force to the cam 230 to rotate the cam 230. In another embodiment, the locking member 400 is a magnet detachably disposed at one side of the first mounting hole 111, and the cam 230 is made of a magnetic material such as iron. When the adjustable roller assembly 200 needs to be adjusted, the magnet is taken out; after the adjustment of the adjustable roller assembly 200 is completed, the magnet is coupled to the mounting bracket 100, so that the cam 230 is magnetically fixed. In another embodiment, the locking member 400 includes a limit screw 410, and the limit screw 410 passes through a sidewall of the first mounting hole 111 and is opposite to a side of the cam 230. After the adjustment of the adjustable roller assembly 200 is completed, the side of the cam 230 opposite to the side of the limit screw 410 is abutted against the side wall of the first mounting hole 111 by screwing the limit screw 410. Therefore, the limiting screw 410 and the side wall of the first mounting hole 111 can fix the cam 230 from opposite directions, thereby fixing the position of the adjustable roller assembly 200.

Fig. 12 is a schematic structural view of a mounting plate according to an embodiment of the present invention, and fig. 13 is a sectional view of the mounting plate taken along the plane D-D in fig. 13.

Referring to fig. 5-6 and 10-13, in some embodiments, the mounting bracket 100 further has a guide hole 112, and the first mounting shaft 220 is partially disposed through the guide hole 112 and can move along the guide hole 112 in a radial direction. By providing the guide hole 112, it is possible to provide a guide and limit movement for the positional movement of the first mounting shaft 220 so that the first mounting shaft 220 can move within a predetermined range. The guide holes 112 may be formed in various shapes, such as a straight line, an arc, a ring, etc., as required by the adjustment range of the adjustable roller assembly 200.

In some embodiments, referring to fig. 10-11, the first mounting hole 111 is larger than the cam 230, and the first mounting shaft 220 serves as a rotation shaft when the cam 230 rotates. The locking member 400 includes a set screw 410, the set screw 410 passing through a sidewall of the first mounting hole 111 and facing a side of the cam 230, the set screw 410 for abutting against the side of the cam 230 to lock the cam 230. The guide hole 112 is an oblong hole, and the width of the guide hole 112 matches the diameter of the corresponding position of the first mounting shaft 220, and the first mounting shaft 220 can move along the length direction of the oblong hole. When the first mounting shaft 220 is rotated, the cam 230 is rotated, and the first mounting shaft 220 is moved along the length direction of the oblong-shaped hole according to the position of the cam 230 contacting the side wall of the first mounting hole 111. The extending direction of the setscrew 410 is the same as the length direction of the guide hole 112. After the position adjustment of the first mounting shaft 220 is completed, the limit screw 410 is tightened so that the limit screw 410 presses the cam 230 against the sidewall of the first mounting hole 111 for fixing. At this time, the setscrew 410, the guide hole 112, and the contact surface of the cam 230 with the first mounting hole 111 are substantially aligned. In some embodiments, the first mounting hole 111 is disposed between the guiding hole 112 and the first roller 210, i.e., the first mounting hole 111 faces the first roller 210 and the guiding hole 112 faces away from the first roller 210, so as to facilitate the mounting of the adjustable roller assembly 200 on the mounting bracket 100.

The roller assembly 200, 300 may be provided with one end on the mounting bracket 100 and the other end suspended, i.e., the mounting bracket 100 supports one end of the roller assembly 200, 300; alternatively, both ends of the roller assembly 200, 300 may be disposed on the mounting frame 100, and the mounting frame 100 supports both ends of the roller assembly 200, 300; alternatively, the middle portion of the drum assembly 200, 300 may be provided on the mounting frame 100, and the mounting frame 100 supports the middle portion of the drum assembly 200, 300. Those skilled in the art can select the arrangement of the roller assemblies 200, 300 on the mounting frame 100 according to the length, weight, stability requirements for the roller assemblies 200, 300, the arrangement position of the slack adjuster, etc. of the roller assemblies 200, 300.

In some embodiments, referring to fig. 1-6, mount 100 includes two mount plates 110 and at least one connector 120. The two mounting plates 110 are disposed opposite to each other, and the connecting member 120 connects the two mounting plates 110. The first mounting hole 111 is provided on the mounting plate 110. The two ends of the roller assemblies 200 and 300 are respectively arranged on the two mounting plates 110, that is, the two mounting plates 110 respectively support the corresponding ends of the roller assemblies 200 and 300, so that the roller assemblies 200 and 300 can be more stable, and the roller assemblies 200 and 300 are prevented from shaking or bending deformation in the working process.

Further, in some embodiments, the adjustable roller assembly 200 includes two cams 230, and the two cams 230 are disposed corresponding to both ends of the first roller 210. The two mounting plates 110 each have a first mounting hole 111, the first mounting holes 111 correspond to the cams 230 one-to-one, and the positions of the first mounting holes 111 on the two mounting plates 110 correspond to each other. The two cams 230 of the adjustable roller assembly 200 are respectively disposed in the corresponding first mounting holes 111 of the two mounting plates 110. The two cams 230 are symmetrical, so that when the adjustable roller assembly 200 is adjusted, both ends of the first mounting shaft 220 can be always kept perpendicular to the mounting plate 110, thereby preventing the adjustable roller assembly 200 from being deflected.

The number and shape of the connecting members 120 may be selected as desired, and the connecting members 120 may be plate-shaped, rod-shaped, table-shaped, etc. In the present embodiment, the connecting members 120 are rod-shaped, and the number of the connecting members 120 is four. Both ends of the connecting member 120 are fixedly coupled to the corresponding mounting plates 110 by screws. The four connection members 120 are disposed corresponding to four top corners of the mounting plate 110, respectively, and the connection members 120 are substantially perpendicular to the mounting plate 110. Accordingly, the stability of the mounting frame 100 can be ensured, and a certain distance can be maintained between the two mounting plates 110, so that the roller assemblies 200 and 300 can rotate normally.

The roller assemblies 200, 300 may further include at least one fixed roller assembly 300, as required for practical use. The fixed roller assembly 300 includes a second mounting shaft 320 and a second roller 310, the second roller 310 being sleeved outside the second mounting shaft 320. The position of the fixing roller assembly 300 on the mounting block 100 is relatively fixed and can rotate, that is, the position of the second mounting shaft 320 remains fixed with respect to the mounting block 100. The mounting block 100 further has a second mounting hole 113, and the second mounting shaft 320 is coupled to the second mounting hole 113.

The fixed roller assembly 300 may perform the rotatable function in various ways. In one embodiment, the second mounting shaft 320 is rotatably disposed in the second mounting hole 113, and the second roller 310 is sleeved outside the second mounting shaft 320 and circumferentially fixed with the second mounting shaft 320. For example, referring to fig. 5 to 6 and 10 to 11, the second mounting shaft 320 is disposed in the second mounting hole 113 through a bearing 600, and the second drum 310 is splined to the second mounting shaft 320. Thereby, the second mounting shaft 320 and the second drum 310 can be rotated simultaneously. In another embodiment, the second mounting shaft 320 is fixedly coupled to the second mounting hole 113 in a circumferential direction, and the second drum 310 is rotatably coupled to the second mounting shaft 320. For example, the second mounting shaft 320 is circumferentially fixed to the second mounting hole 113 by a key connection, and the second drum 310 is coupled to the second mounting shaft 320 by a bearing.

In some embodiments, the second mounting shaft 320 is disposed in the second mounting hole 113 via a one-way bearing. Thus, the fixed roller assembly 300 can only rotate in a predetermined direction and cannot be reversed to ensure that the flexible material can be conveyed or wound in a predetermined direction. Alternatively, the second mounting shaft 320 is disposed in the second mounting hole 113 through a one-way bearing, and the second drum 310 is fixedly connected with the second mounting shaft 320; a driving device may be provided in connection with the second mounting shaft 320 to drive the fixed roller assembly 300 to rotate to power the winding or outward transfer of the web.

The number of fixed roller assemblies 300 and adjustable roller assemblies 200 may be arbitrarily selected as desired. For example, referring to fig. 1-6, in this embodiment, the tightness adjustment mechanism comprises three roller assemblies, two of which are adjustable roller assemblies 200 and one of which is a fixed roller assembly 300. The three roller assemblies are parallel, the fixed roller assembly 300 is disposed between the two adjustable roller assemblies 200, and the web may be disposed on the fixed roller assembly 300. By adjusting the two adjustable roller assemblies 200, rolls of different thicknesses can be accommodated.

The embodiment of the utility model provides a tightness adjusting mechanism which comprises a mounting frame and at least two roller assemblies, wherein the mounting frame is provided with a first mounting hole; the adjustable roller assembly comprises a first installation shaft, a first roller and a cam, the first roller is sleeved outside the first installation shaft and is rotatably connected with the first installation shaft, the cam is connected with the first installation shaft, and the cam is arranged in the first installation hole and can rotate in the first installation hole to adjust the position of the first installation shaft. The tightness adjusting mechanism provided by the embodiment of the utility model can adjust the position of the adjustable roller component by rotating the cam, so that the gap between two adjacent roller components is adjusted, and the tightness adjusting function is realized; meanwhile, the tightness adjusting mechanism provided by the embodiment of the utility model has the advantages of simple structure and convenience in maintenance.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A tightness adjustment mechanism, comprising:

a mounting bracket (100) having a first mounting hole (111); and

at least two roller assemblies (200, 300) connected to the mounting frame (100), at least one of the roller assemblies (200, 300) being an adjustable roller assembly (200);

wherein the adjustable roller assembly (200) comprises:

a first mounting shaft (220);

the first roller (210) is sleeved outside the first mounting shaft (220) and is rotationally connected with the first mounting shaft (220); and

a cam (230) coupled to the first mounting shaft (220), the cam (230) being disposed in the first mounting hole (111) and rotatable in the first mounting hole (111) to adjust the position of the first mounting shaft (220).

2. The tightness adjustment mechanism of claim 1 wherein said mounting bracket (100) further has a guide hole (112), said first mounting shaft (220) being partially disposed through said guide hole (112) and being radially movable along said guide hole (112).

3. The slack adjustment mechanism of claim 2, wherein the first mounting hole (111) is disposed between the guide hole (112) and the first roller (210).

4. The slack adjustment mechanism of claim 2, wherein the guide hole (112) is an oblong hole, the slack adjustment mechanism further comprising:

a locking member (400), the locking member (400) including a set screw (410), the set screw (410) passing through a side wall of the first mounting hole (111) and opposing a side surface of the cam (230), the set screw (410) extending in the same direction as a length direction of the guide hole (112), the set screw (410) being configured to abut against the side surface of the cam (230) to lock the cam (230).

5. The tightness adjustment mechanism of claim 1, wherein said mounting bracket (100) comprises:

the two mounting plates (110) are oppositely arranged at intervals, the first mounting hole (111) is formed in the mounting plate (110), and the two mounting plates (110) support the roller assemblies (200, 300) together; and

at least one connector (120), the connector (120) connecting the two mounting plates (110).

6. The tightness adjustment mechanism of claim 5, wherein said adjustable roller assembly (200) comprises two cams (230), said two cams (230) being disposed corresponding to both ends of said first roller (210), and said two cams (230) being symmetrical;

the first mounting holes (111) of the two mounting plates (110) correspond to the cams (230) one by one, and the two cams (230) of the adjustable roller assembly (200) are respectively arranged in the corresponding first mounting holes (111) of the two mounting plates (110).

7. The tightness adjustment mechanism of claim 1, wherein said mounting bracket (100) further has a second mounting hole (113), at least one of said roller assemblies (200, 300) is a fixed roller assembly (300), a position of said fixed roller assembly (300) is fixed with respect to said mounting bracket (100), said fixed roller assembly (300) comprises:

a second mounting shaft (320) connected to the second mounting hole (113); and

and a second drum (310) sleeved outside the second mounting shaft (320).

8. The tightness adjustment mechanism of claim 7, wherein said second mounting shaft (320) is rotatably connected to said second mounting hole (113), and said second roller (310) is circumferentially fixedly connected to said second mounting shaft (320); or,

the second mounting shaft (320) is circumferentially and fixedly connected with the second mounting hole (113), and the second roller (310) is rotatably connected with the second mounting shaft (320).

9. The slack adjustment mechanism of claim 1, further comprising:

a locking member (400) configured to lock the cam (230) and/or the first mounting shaft (220).

10. The slack adjustment mechanism of claim 1, further comprising:

and a handle (500) fixed to one end of the first mounting shaft (220).

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