Chain tightness adjusting mechanism

Abstract

The utility model relates to a chain tightness adjusting mechanism, belongs to the technical field of conveying equipment, and solves the technical problem that the chain tightness of the existing chain type conveying equipment is inconvenient to adjust. The chain tightness adjusting mechanism comprises a fixed seat which is installed on a rack of the chain conveyor, and a sliding hole is formed in the fixed seat; the straight rod is inserted into the sliding hole in a sliding mode, a first threaded section is arranged on the straight rod, and the first threaded section is located at the position close to one end of the straight rod; the adjusting nut is in threaded connection with the first threaded section; the elastic piece is mounted between the adjusting nut and the fixed seat, so that the adjusting nut is elastically connected with the fixed seat; the mounting seat is connected to the other end of the straight rod; and the chain wheel is rotationally mounted on the mounting seat and is used for winding a chain. By means of the structure, the adjusting mechanism can help a user to adjust the tightness degree of a chain of the chain conveyor more conveniently, shutdown is not needed in the adjusting process, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of conveying equipment, and particularly relates to a chain tension adjusting mechanism. Background Art

[0002] In many occasions, chain-type conveying equipment is used to convey materials (such as lime, etc.) over a long distance, thereby reducing the labor intensity of workers in handling materials and helping to improve work efficiency. The core component of a chain conveyor is a chain, which is composed of a number of chain links connected end to end. However, affected by various factors, the chain will gradually become loose during long-term use. To ensure the normal operation of the chain, it is necessary to manually adjust the tension of the chain.

[0003] Currently, the tension of the chain is adjusted by removing chain links. The process of removing chain links from the chain is rather troublesome, time-consuming and laborious. Moreover, when removing chain links, it is necessary to stop the operation of the chain-type conveying equipment, which will also affect production efficiency. Summary of the Utility Model

[0004] The utility model provides a chain tension adjusting mechanism for solving the technical problem that it is inconvenient to adjust the tension of the chain of the current chain-type conveying equipment.

[0005] The utility model is realized through the following technical solutions: A chain tension adjusting mechanism includes:

[0006] A fixed seat, which is installed on the frame of the chain conveyor, and the fixed seat is provided with a sliding hole;

[0007] A straight rod, which is slidably inserted into the sliding hole. A first threaded section is provided on the straight rod, and the first threaded section is located at a position close to one end of the straight rod;

[0008] An adjusting nut, which is screwed onto the first threaded section;

[0009] An elastic member, which is installed between the adjusting nut and the fixed seat to elastically connect the adjusting nut and the fixed seat;

[0010] An installation seat, which is connected to the other end of the straight rod;

[0011] A sprocket, which is rotatably installed on the installation seat, and the sprocket is used for winding the chain.

[0012] Furthermore, in order to better realize the utility model, it further includes:

[0013] A support seat, which is installed on the frame of the chain conveyor, the support seat is located between the fixed seat and the installation seat, and the support seat is provided with a through hole;

[0014] A sliding sleeve is detachably and fixedly installed on the straight rod, and the sliding sleeve is slidably inserted into the through hole.

[0015] Furthermore, in order to better implement the present utility model, a second threaded section is provided on the straight rod, and the second threaded section is located near the other end of the straight rod;

[0016] It further includes two mounting nuts, and both of the two mounting nuts are screwed onto the second threaded section;

[0017] The sliding sleeve is sleeved outside the straight rod and clamped between the two mounting nuts.

[0018] Furthermore, in order to better implement the present utility model, the mounting seat includes:

[0019] A seat body, and the sprocket is rotatably installed on the seat body;

[0020] A fixing nut is fixedly connected to the seat body, and the fixing nut is screwed onto the second threaded section so that the mounting seat is connected to the other end of the straight rod.

[0021] Furthermore, in order to better implement the present utility model, the seat body includes:

[0022] A straight pipe, and the fixing nut is fixedly welded to one end of the straight pipe;

[0023] A block body is fixedly arranged at the other end of the straight pipe;

[0024] Two mounting plates are both connected to the block body, and the two mounting plates are oppositely arranged on both sides of the block body, and the sprocket is rotatably installed between the two mounting plates.

[0025] Furthermore, in order to better implement the present utility model, both of the two mounting plates are provided with round holes, and the round holes on the two mounting plates are coaxial;

[0026] The seat body further includes a rotating shaft, and both ends of the rotating shaft are respectively inserted into the round holes on the two mounting plates, and the rotating shaft is locked to the mounting plate through a locking pin;

[0027] The sprocket is rotatably sleeved on the rotating shaft.

[0028] Furthermore, in order to better implement the present utility model, the elastic member is a spring, the spring is sleeved outside the straight rod, and both ends of the spring respectively abut against the adjusting nut and the fixed seat.

[0029] Furthermore, in order to better implement the present utility model, a locking structure is further installed on the fixed seat, and the locking structure can limit the axial movement of the straight rod.

[0030] Further, to better implement the present utility model, the locking structure includes:

[0031] A supporting block, fixedly connected to the outer wall of the fixed seat through a connecting plate, and a first semi-circular through groove is provided at the top of the supporting block;

[0032] A pressing block, with a second semi-circular through groove opened at the bottom end. The pressing block is bolted to the top of the supporting block, and the second semi-circular through groove and the first semi-circular through groove are spliced to form a clamping hole;

[0033] The straight rod passes through the clamping hole, and when locked, the clamping hole clamps the straight rod.

[0034] Further, to better implement the present utility model, rubber sheets are pasted on the groove walls of the first semi-circular through groove and the second semi-circular through groove.

[0035] The present utility model has the following beneficial effects compared with the prior art:

[0036] The chain tension adjustment mechanism provided by the present utility model includes a fixed seat, a straight rod, an adjusting nut, an elastic member, and a sprocket. The fixed seat is installed on the frame of the chain conveyor and fixed on the frame. A sliding hole is provided on the fixed seat, and the straight rod is slidably inserted into the sliding hole. In this way, the fixed seat plays a supporting role for the straight rod, and the straight rod can slide relative to the fixed seat and the frame. A first threaded section is provided on the straight rod, and this first threaded section is located at a position close to one end of the straight rod. The adjusting nut is screwed onto the first threaded section, and the elastic member is installed between the adjusting nut and the fixed seat to elastically connect the adjusting nut and the fixed seat. The mounting seat is connected to the other end of the straight rod, and the sprocket is rotatably installed on the mounting seat. The chain of the chain conveyor is wound around the sprocket. In this way, when the straight rod drives the mounting seat and the sprocket to move axially, the tension of the chain can be adjusted.

[0037] In use, since the adjusting nut is elastically connected to the fixed seat through an elastic member, and the adjusting nut is screwed onto the first threaded section of the straight rod, and the fixed seat is installed on the frame of the chain conveyor, it can be understood that the straight rod is elastically connected to the fixed seat and the frame. By turning the adjusting nut, the elastic force exerted on the nut by the elastic member is just balanced with the pulling force applied to the straight rod by the chain. At this time, the chain is in a taut state and can run normally. If the chain is slack to a certain extent, then the pulling force of the chain on the sprocket is reduced, and the pulling forces on the mounting seat, the straight rod and the adjusting nut are reduced. Due to the elastic force of the elastic member, the elastic member will elongate, thereby pushing the adjusting nut a certain distance away from the fixed seat until the elastic force and the pulling force reach balance again. The straight rod drives the mounting seat and the sprocket to move together with the adjusting nut, and then makes the sprocket close to the fixed seat and tighten the chain again. That is, when the slack degree of the chain is within a certain range, this mechanism can automatically and real-time adjust the tightness of the chain without manual intervention. When the slack degree of the chain exceeds a certain range (corresponding to the elastic member no longer having elastic potential energy), at this time, it is necessary to manually turn the adjusting nut to reduce the distance between the adjusting nut and the fixed seat, so that the elastic member is compressed again, so that the mechanism can again have the ability to automatically adjust the tightness of the chain.

[0038] Through the above structure, the structure of the chain tightness adjusting mechanism provided by the present utility model is simple. It can conveniently adjust the tightness of the chain during use and does not need to stop the machine during the adjustment process, with strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 is a schematic structural diagram of the chain tightness adjusting mechanism provided by the embodiment of the present utility model;

[0041] Figure 2 is an exploded view of the chain tightness adjusting mechanism provided by the embodiment of the present utility model;

[0042] Figure 3 is a reference diagram for the use of the chain tightness adjusting mechanism provided by the embodiment of the present utility model;

[0043] Figure 4 is a schematic installation structure diagram of the locking structure on the fixed seat in the embodiment of the present utility model.

[0044] In the figure:

[0045] 1 - Fixed seat, 2 - Frame, 3 - Straight rod, 31 - First threaded section, 32 - Second threaded section, 4 - Adjusting nut, 5 - Spring, 6 - Mounting seat, 61 - Seat body, 611 - Straight pipe, 612 - Block, 613 - Mounting plate, 62 - Fixing nut, 63 - Rotating shaft, 7 - Sprocket, 8 - Chain, 9 - Support seat, 10 - Sliding sleeve, 11 - Mounting nut, 12 - Locking structure, 121 - Supporting block, 122 - Connecting plate, 123 - Pressing block, 124 - Bolt, 125 - Rubber sheet. Detailed implementation manners

[0046] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other implementation manners obtained by those of ordinary skill in the art without creative efforts shall fall within the scope protected by the present utility model.

[0047] As Figures 1 - 3 shown, the chain tightness adjusting mechanism provided by the present utility model includes a fixed seat 1, a straight rod 3, an adjusting nut 4, an elastic member and a sprocket 7, wherein:

[0048] The fixed seat 1 is a solid block structure, and a sliding hole is formed in the fixed seat 1. The sliding hole is a straight hole with a smooth inner wall. The above-mentioned fixed seat 1 is fixedly installed on the frame 2 of the chain conveyor by screws, so that the fixed seat 1 is fixed on the frame 2. The straight rod 3 is slidably inserted into the above-mentioned sliding hole. In this way, the fixed seat 1 plays a supporting role for the straight rod 3, and the straight rod 3 can slide relative to the fixed seat 1 and the frame 2. A first threaded section 31 is provided on the straight rod 3, and the first threaded section 31 is located at a position close to one end of the straight rod 3. Optionally, the first threaded section 31 can extend into the above-mentioned sliding hole or be located outside the above-mentioned sliding hole.

[0049] The above-mentioned adjusting nut 4 is screwed onto the above-mentioned first threaded section 31, and the elastic member is installed between the above-mentioned adjusting nut 4 and the above-mentioned fixed seat 1, so that the adjusting nut 4 and the fixed seat 1 are elastically connected. It should be noted that in the use state, the above-mentioned elastic member is in a compressed state, that is, the above-mentioned adjusting nut 4 has a tendency to move away from the fixed seat 1 under the action of the elastic member.

[0050] The mounting seat 6 is connected to the other end of the straight rod 3, and the sprocket 7 is rotatably installed on the mounting seat 6. The chain 8 of the chain conveyor is wound around the above-mentioned sprocket 7. In this way, when the straight rod 3 drives the mounting seat 6 and the sprocket 7 to move axially, the tightness of the chain 8 can be adjusted.

[0051] During use, since the adjusting nut 4 and the fixed seat 1 are elastically connected by an elastic member, and the adjusting nut 4 is screwed onto the first threaded section 31 of the straight rod 3, and the fixed seat 1 is installed on the frame 2 of the chain conveyor, it can be understood that the straight rod 3 is elastically connected to the fixed seat 1 and the frame 2. By turning the adjusting nut 4, the elastic force exerted by the elastic member on the nut is just balanced with the pulling force applied by the chain 8 to the straight rod 3. At this time, the chain 8 is in a taut state and the chain 8 can operate normally.

[0052] For a clearer explanation, this embodiment is illustrated by way of example. For example, the elastic force exerted by the spring 5 on the adjusting nut 4 and the straight rod 3 is to the left, and the pulling force exerted by the sprocket 7 on the mounting seat 6 and the straight rod 3 is to the right. During normal operation, the pulling force and the elastic force are equal in magnitude and opposite in direction. If the chain 8 becomes slack to a certain extent, then the pulling force exerted on the sprocket 7 by the chain 8 decreases, and the pulling forces received by the mounting seat 6, the straight rod 3, and the adjusting nut 4 decrease. Due to the elastic force of the elastic member, at the moment of slackening, the elastic member will elongate, thereby pushing the adjusting nut 4 a certain distance away from the fixed seat 1 (i.e., to the left) until the elastic force and the pulling force reach balance again. The straight rod 3 drives the mounting seat 6 and the sprocket 7 to move together with the adjusting nut 4, thereby causing the sprocket 7 to move closer to the fixed seat 1 and tighten the chain 8 again. That is, when the slack degree of the chain 8 is within a certain range, this mechanism can automatically and real-time adjust the tightness of the chain 8 without manual intervention.

[0053] When the slack degree of the chain 8 exceeds a certain range, at this time, the elastic member elongates until there is no more elastic potential energy stored inside. At this time, it is necessary to manually turn the adjusting nut 4 so that the distance between the adjusting nut 4 and the fixed seat 1 decreases, which causes the elastic member to be compressed again, thereby enabling this mechanism to have the ability to automatically adjust the tightness of the chain 8 again. Through the above structure, the structure of the chain tightness adjusting mechanism provided by the present utility model is simple. It can help the user conveniently adjust the tightness of the chain 8 during use, and does not require the machine to stop during the adjustment process, with strong practicability.

[0054] Of course, within a certain range of slack degree, this mechanism can automatically adjust the tightness of the chain 8 without manual intervention, thereby reducing the labor intensity of workers and improving production efficiency. In addition, during the specific use process, the tightness of the chain 8 can be quickly adjusted by turning the above-mentioned adjusting nut 4.

[0055] Optionally, the above elastic member is a spring 5. The spring 5 is sleeved outside the above straight rod 3, and both ends of the spring 5 are respectively abutted against the above adjusting nut 4 and the fixed seat 1. As another optional implementation manner of this embodiment, the elastic member in this embodiment is an air-filled bladder body provided with a central channel, and the above straight rod 3 is inserted through this central channel. This embodiment is described and illustrated by taking the elastic member constituted by the spring 5 as an example.

[0056] An alternative implementation of this embodiment is as follows: The chain tightness adjustment mechanism provided in this embodiment further includes a support base 9 and a sliding sleeve 10, where:

[0057] The support base 9 is a solid block, which is bolted to the frame 2 of the chain conveyor by screws, and the support base 9 is located between the fixed base 1 and the mounting base 6. A through hole is provided in the support base 9, and the sliding sleeve 10 is adapted to the through hole, and the outer wall of the sliding sleeve 10 is smooth. The sliding sleeve 10 is detachably and fixedly installed on the straight rod 3, and the sliding sleeve 10 is slidably inserted into the through hole. With the help of the sliding sleeve 10, the straight rod 3 and the support base 9 do not directly contact, thereby protecting the straight rod 3. Moreover, the cooperation between the sliding sleeve 10 and the through hole can position, support and guide the axial movement of the straight rod 3 (i.e., the stroke of the straight rod 3 when adjusting the tightness of the sprocket 7), making the axial movement of the straight rod 3 smoother.

[0058] In order to detachably install the sliding sleeve 10 on the straight rod 3, optionally, in this embodiment, a second threaded section 32 is further provided on the straight rod 3, and the second threaded section 32 is located near the other end of the straight rod 3. Two mounting nuts 11 are screwed on the second threaded section 32. The sliding sleeve 10 is sleeved outside the straight rod 3 and clamped between the two mounting nuts 11, that is, the two mounting nuts 11 clamp the sliding sleeve 10 on the second threaded section 32 of the straight rod 3. Of course, internal threads can also be provided on the inner wall of the sliding sleeve 10, so as to directly screw the sliding sleeve 10 onto the second threaded section 32 of the straight rod 3. In addition, a gasket is further provided between the mounting nut 11 and the sliding sleeve 10, and the outer diameter of the gasket is larger than the aperture of the through hole of the support base 9. In this way, the distance of the axial movement of the straight rod 3 can also be limited by the mounting nut 11 and the gasket.

[0059] In order to connect the mounting base 6 to the other end of the straight rod 3, optionally, in this embodiment, the mounting base 6 includes a base body 61 and a fixing nut 62. The sprocket 7 is rotatably installed on the base body 61, and the fixing nut 62 is fixedly connected to the base body 61, and the fixing nut 62 is screwed to the second threaded section 32. Of course, a coupling can also be used to connect the straight rod 3 and the mounting base 6, or screws can be used to connect the straight rod 3 and the mounting base 6 together.

[0060] Optionally, the base body 61 in this embodiment includes a straight pipe 611, a block 612 and two mounting plates 613, where:

[0061] The above fixed nut 62 is welded and fixed to one end of the above straight pipe 611, and the other end of the above straight rod 3 can extend into the above straight pipe 611. The above block 612 is welded or integrally formed at the other end of the above straight pipe 611. Two mounting plates 613 are both welded or hinged to the above block 612 and locked with a locking pin. Of course, the mounting plate 613 can also be integrally formed with the above block 612. In short, the mounting plate 613 is connected to the above block 612, and the two above mounting plates 613 are arranged opposite to each other on the upper and lower sides of the above block 612. The sprocket 7 is rotatably installed between the two mounting plates 613. Specifically, circular holes are provided in both mounting plates 613, and the circular holes on the two mounting plates 613 are coaxial. The above seat body 61 further includes a rotating shaft 63. Both ends of the rotating shaft 63 are inserted into the circular holes on the two mounting plates 613 respectively, and the rotating shaft 63 is locked to the mounting plate 613 by a locking pin. At this time, the rotating shaft 63 can rotate or be fixed relative to the mounting plate 613. The sprocket 7 has a central hole. During installation, the sprocket 7 is rotatably sleeved on the rotating shaft 63, that is, the rotating shaft 63 is rotatably inserted into the central hole of the sprocket 7. Of course, the above mounting seat 6 can also be set in other forms, as long as the sprocket 7 is rotatably installed thereon, and the axial direction of the rotating shaft 63 at the center of the sprocket 7 is perpendicular to the axial direction of the above straight rod 3.

[0062] An alternative implementation of this embodiment is as follows: As Figure 1 , Figure 2 and Figure 4 shown, in this embodiment, a locking structure 12 is further provided between the above fixed seat 1 and the straight rod 3. The locking structure 12 can limit the axial movement of the straight rod 3. In this way, when it is necessary to fix the above straight rod 3 on the frame 2, the straight rod 3 is locked by using the locking structure 12. In this case, although the tightness of the chain 8 cannot be automatically and real-time adjusted, the position of the above sprocket 7 can be guaranteed to be fixed, thereby improving the running stability of the chain conveyor.

[0063] Of course, during the specific use process, if it is necessary to adjust the tightness of the chain 8 in real time and automatically, the locking structure 12 can be kept in an unlocked state all the time.

[0064] Optionally, the above locking structure 12 includes a supporting block 121 and a pressing block 123, where:

[0065] The supporting block 121 is fixedly connected to the outer wall of the fixed seat 1 through a connecting plate 122. A first semi-circular through groove is provided at the top of the supporting block 121, and the first semi-circular through groove is adapted to the above straight rod 3.

[0066] The bottom end of the briquette 123 is provided with a second semi-circular through groove, which is also adapted to the above-mentioned straight rod 3, and the second semi-circular through groove corresponds to the above-mentioned first semi-circular through groove up and down. The briquette 123 is bolted to the top end of the supporting block 121 through a bolt 124. The second semi-circular through groove and the first semi-circular through groove are spliced to form a clamping hole, and the straight rod 3 is inserted into the clamping hole. When locking, tighten the bolt 124, so as to press the briquette 123 against the top end of the supporting block 121, and the clamping hole clamps the above-mentioned straight rod 3. When it needs to be loosened, just loosen the above-mentioned bolt 124.

[0067] As another alternative implementation manner of this embodiment, the locking member in this embodiment can also be a seat tube clamp installed on the outer wall of the fixed seat 1, and the straight rod 3 is inserted into the inner hole of the seat tube clamp.

[0068] In order to prevent the straight rod 3 from being clamped by the hole wall of the above-mentioned clamping hole, in this embodiment, rubber sheets 125 are pasted on the groove walls of the above-mentioned first semi-circular through groove and the second semi-circular through groove. The rubber sheets 125 can not only protect the straight rod 3, but also play a role in shock absorption. Moreover, the rubber sheets 125 can also increase the friction force applied to the straight rod 3 when the clamping hole clamps the straight rod 3.

[0069] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope recorded by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claimed rights.

Claims

1. A chain tension adjustment mechanism, characterized in that: include: A fixed seat (1) is mounted on a frame (2) of the chain conveyor, and a sliding hole is provided on the fixed seat (1); A straight rod (3) is slidably inserted into the sliding hole, and a first thread segment (31) is provided on the straight rod (3), and the first thread segment (31) is located near one end of the straight rod (3); An adjusting nut (4) threadedly connected to the first threaded section (31); an elastic member installed between the adjusting nut (4) and the fixing seat (1) so as to elastically connect the adjusting nut (4) and the fixing seat (1); A mounting seat (6) connected to the other end of the straight rod (3); A sprocket (7) is rotatably mounted on the mounting seat (6), and the sprocket (7) is used for winding around a chain (8).

2. The chain tension adjustment mechanism according to claim 1, characterized in that: Also includes: A support seat (9) is installed on the frame (2) of the chain conveyor, the support seat (9) is located between the fixing seat (1) and the mounting seat (6), and the support seat (9) is provided with a through hole; A sliding sleeve (10) is detachably and fixedly mounted on the straight rod (3), and the sliding sleeve (10) is slidably inserted into the through hole.

3. The chain tension adjustment mechanism according to claim 2, characterized in that: The straight rod (3) is also provided with a second thread segment (32), and the second thread segment (32) is located close to the other end of the straight rod (3); It also includes two mounting nuts (11), both of which are threadedly connected to the second threaded section (32); The sliding sleeve (10) is sleeved outside the straight rod (3) and clamped between the two mounting nuts (11).

4. The chain tension adjustment mechanism according to claim 3, characterized in that: The mounting seat (6) comprises: A seat body (61), wherein the sprocket (7) is rotatably mounted on the seat body (61); A fixing nut (62) is fixedly connected to the seat body (61), and the fixing nut (62) is threadedly connected to the second threaded section (32) so that the mounting seat (6) is connected to the other end of the straight rod (3).

5. The chain tension adjustment mechanism according to claim 4, characterized in that: The seat body (61) comprises: A straight pipe (611), wherein the fixing nut (62) is welded and fixed to one end of the straight pipe (611); A block (612) is fixedly mounted on the other end of the straight tube (611); Two mounting plates (613) are both connected to the block body (612). The two mounting plates (613) are arranged on both sides of the block body (612) facing each other. The sprocket wheel (7) is rotatably mounted between the two mounting plates (613).

6. The chain tension adjustment mechanism according to claim 5, characterized in that: The two mounting plates (613) are both provided with circular holes, and the circular holes on the two mounting plates (613) are coaxial; The seat body (61) further comprises a rotating shaft (63), the two ends of which are respectively inserted into the circular holes on the two mounting plates (613), and the rotating shaft (63) is locked to the mounting plates (613) by means of a locking pin; The sprocket (7) is rotatably sleeved on the rotating shaft (63).

7. The chain tension adjustment mechanism according to any one of claims 1 to 6, characterized in that: The elastic member is a spring (5), which is sleeved outside the straight rod (3), and the two ends of the spring (5) are respectively against the adjusting nut (4) and the fixing seat (1).

8. The chain tension adjustment mechanism according to any one of claims 1 to 6, characterized in that: A locking structure (12) is also installed on the fixing seat (1), and the locking structure (12) is capable of limiting the axial movement of the straight rod (3).

9. The chain tension adjustment mechanism according to claim 8, characterized in that: The locking structure (12) comprises: A supporting block (121) is fixedly connected to the outer wall of the fixing seat (1) via a connecting plate (122), and a first semicircular through groove is provided at the top of the supporting block (121); A pressing block (123) has a second semicircular through groove at its bottom end, the pressing block (123) is bolted to the top of the supporting block (121) via a bolt (124), and the second semicircular through groove and the first semicircular through groove are spliced ​​to form a clamping hole; The straight rod (3) is inserted into the clamping hole, and when locked, the clamping hole clamps the straight rod (3).

10. The chain tension adjustment mechanism according to claim 9, characterized in that: Rubber (125) is pasted on the groove walls of the first semicircular through groove and the second semicircular through groove.

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