Automatic tensioning mechanism

Abstract

The utility model discloses an automatic tensioning mechanism and relates to the technical field of chain tensioning, the automatic tensioning mechanism is used for a conveying line, the conveying line comprises a mounting frame and a chain, the chain is rotationally arranged on the mounting frame and is of an annular structure, and the automatic tensioning mechanism comprises a supporting frame arranged on the mounting frame; the floating guide block is arranged on the supporting frame and slidably connected to the supporting frame in the vertical direction, and the chain is connected to the bottom of the floating guide block in a wound mode; the two ends of the compression spring are elastically connected with the mounting frame and the floating guide block correspondingly, and the compression spring is in a compressed state, so that the floating guide block has the trend of moving downwards. According to the technical scheme, automatic fine adjustment can be carried out according to the actual situation of the chain, dynamic balance is kept, the chain is always in the tensioning state, manual intervention is not needed, the manual workload is reduced, the transmission efficiency of the chain can be improved, the service life can be prolonged, and replacement and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chain tensioning technology, and in particular to an automatic tensioning mechanism. Background Technology

[0002] As one of the pillar industries of economic development, the manufacturing industry has relatively strict capacity requirements. As an indispensable part of the manufacturing industry, the chain conveyor system undertakes the important task of material transfer. The tension of the chain not only affects the stability of the conveyor system, but may also lead to a series of safety hazards and technical failures. Even if the tension of the chain is manually adjusted before use, it may become too loose after long-term use, which will affect production efficiency. Utility Model Content

[0003] The main purpose of this invention is to propose an automatic tensioning mechanism that can automatically adjust the tension of the chain.

[0004] To achieve the above objectives, this utility model proposes an automatic tensioning mechanism for a conveyor line. The conveyor line includes a mounting frame and a chain, the chain being rotatably mounted on the mounting frame and having a ring structure. The automatic tensioning mechanism includes:

[0005] A support frame is provided on the mounting frame;

[0006] A floating guide block is disposed on the support frame and slidably connected to the support frame in the vertical direction; the chain is wound around the bottom of the floating guide block; and

[0007] A compression spring is elastically connected at both ends to the mounting bracket and the floating guide block, respectively. When the compression spring is in a compressed state, the floating guide block tends to move downward.

[0008] In one embodiment, the support frame has a groove extending in a vertical direction, and the floating guide block has a sliding position that engages with the groove to allow the floating guide block to slide along the support frame.

[0009] In one embodiment, the support frame includes:

[0010] Base plate;

[0011] Two upright plates are provided, which are arranged opposite each other on both sides of the base plate, and a movable cavity is formed between the two upright plates and the base plate. The movable cavity has a first movable opening and a second movable opening opposite each other. The floating guide block is slidably disposed in the movable cavity, and the chain extends into the movable cavity from either the first movable opening or the second movable opening and extends out from the other of the first movable opening and the second movable opening. The part of the chain in the movable cavity is wrapped around the bottom of the floating guide block.

[0012] In one embodiment, the upright plate includes connecting rods that extend vertically, and two connecting rods are provided, with the interval between the two connecting rods configured as a groove.

[0013] In one embodiment, the floating guide block includes a slide block that is arc-shaped and has a mounting surface for winding the chain around it. The center of the mounting surface is recessed inward to form a groove, such that the groove is lower than the mounting surface, and the chain is disposed in the groove.

[0014] In one embodiment, the floating guide block further includes a limiting block, which is configured as a sliding position, is located on one side of the slide block, and is slidably disposed within the slide groove.

[0015] In one embodiment, a stop block is provided in the slide groove, and the floating guide block further includes a first positioning pin and a second positioning pin. The first positioning pin is inserted into the limiting block along a first direction. The first positioning pin and the second positioning pin are detachably connected to have a locked state and an unlocked state. In the locked state, the second positioning pin is inserted into the first positioning pin, and the second positioning pin is engaged at the stop block to limit the floating guide block from sliding downward in the slide groove. In the unlocked state, the second positioning pin is separated from the first positioning pin, so that the floating guide block can slide in the slide groove.

[0016] In one embodiment, the floating guide block further includes a mounting part, and the automatic tensioning mechanism further includes a guide post. The mounting part is mounted on the upper part of the slide, and the mounting part has an upward-opening mounting cavity. One end of the guide post is mounted on the mounting frame, and the other end extends into the mounting cavity. The compression spring is sleeved on the outer periphery of the guide post, and one end located in the mounting cavity is fixedly connected to the mounting part.

[0017] In one embodiment, the automatic tensioning mechanism further includes a cover that covers the outer wall of the support frame and is fixedly connected to the mounting frame, and the cover is provided with a viewing window.

[0018] In one embodiment, the viewing window extends vertically; or, multiple viewing windows are spaced apart vertically.

[0019] In this invention, the automatic tensioning mechanism includes a support frame and a floating guide block. The floating guide block is slidably mounted on the support frame, and the chain is wound around it. The floating guide block is located on the inner wall of the annular structure formed by the chain. Due to its own weight, the floating guide block tends to move downwards, i.e., it moves downwards on the support frame and presses the chain down, automatically compensating for any slack in the chain and ensuring the chain is always in an ideal tension state. When the chain starts running, the floating guide block presses the chain down using its own weight, maintaining a preset tension. The floating guide block on the support frame... With a relatively fixed position, if the chain becomes longer and looser due to prolonged use, wear, or temperature changes, the floating guide block will slide down the support frame a certain distance under the influence of gravity due to the reduced chain tension, thereby tightening the chain again. As the chain runs, the floating guide block can automatically fine-tune according to the actual situation of the chain to maintain a dynamic balance, so that the chain is always in a taut state. This achieves the goal of eliminating the need for manual intervention, reducing the workload of human labor. In addition, maintaining the chain tension through the floating guide block helps to improve the chain's transmission efficiency, extend its service life, and reduce replacement and maintenance costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of an embodiment of the automatic tensioning mechanism provided by this utility model;

[0022] Figure 2 An exploded view of the automatic tensioning mechanism provided by this utility model;

[0023] Figure 3 A schematic diagram of the structure of the floating guide block provided by this utility model;

[0024] Figure 4 A schematic diagram of the structure of the floating guide block and the support frame in the locked state provided by this utility model;

[0025] Figure 5 A schematic diagram of another embodiment of the automatic tensioning mechanism provided by this utility model.

[0026] Explanation of icon numbers:

[0027] 10. Tensioning mechanism;

[0028] 100. Support frame; 110. Base plate; 120. Vertical plate; 121. Connecting rod; 130. Stop block;

[0029] 200, Floating guide block; 210, Slide block; 220, Groove; 230, Limiting block; 240, First locating pin; 250, Mounting part;

[0030] 300. Compression spring;

[0031] 400, guide post;

[0032] 500. Cover; 510. Viewable window;

[0033] 20. Conveyor line; 201. Mounting frame; 202. Chain.

[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0036] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] This utility model proposes an automatic tensioning mechanism.

[0039] Please see Figure 1 In one embodiment of this utility model, the automatic tensioning mechanism 10 is used for a conveyor line 20. The conveyor line 20 includes a mounting frame 201 and a chain 202. The chain 202 is rotatably mounted on the mounting frame 201 and has a ring structure. The automatic tensioning mechanism 10 includes:

[0040] Support frame 100 is mounted on mounting frame 201;

[0041] A floating guide block 200 is mounted on a support frame 100 and slidably connected to the support frame 100 in a vertical direction; a chain 202 is wound around the bottom of the floating guide block 200; and

[0042] The compression spring 300 is elastically connected to the mounting bracket 201 and the floating guide block 200 at both ends. When the compression spring 300 is in a compressed state, the floating guide block 200 tends to move downward.

[0043] In the technical solution of this utility model, the automatic tensioning mechanism 10 includes a support frame 100 and a floating guide block 200. The floating guide block 200 is slidably mounted on the support frame 100, and the chain 202 is wound around the floating guide block 200. A compression spring 300 is provided between the mounting frame 201 and the floating guide block 200 on the inner wall of the annular structure formed by the chain 202. The compression spring 300 is in a compressed state. Due to the downward elastic force of the compression spring 300 and the weight of the floating guide block 200 itself, the floating guide block 200 tends to move downwards, that is, it moves downwards on the support frame 100 and presses the chain 202 downwards, automatically compensating for any slack in the chain 202, so that the chain 202 is always in an ideal tension state. When the chain 202 starts running, the floating guide block 200 presses the chain 202 downwards by its own weight and the downward thrust of the compression spring 300. 2. This ensures that the chain 202 maintains a preset tension, and the floating guide block 200 is relatively fixed in position on the support frame 100. If the chain 202 becomes longer and looser due to prolonged use, wear, or temperature changes, the floating guide block 200 will slide down the support frame 100 a certain distance under the action of gravity and the downward thrust of the compression spring 300 due to the reduced tension of the chain 202, thereby tightening the chain 202 again. As the chain 202 runs, the floating guide block 200 can automatically make fine adjustments according to the actual situation of the chain 202 to maintain a dynamic balance, so that the chain 202 is always in a taut state. This achieves the goal of eliminating the need for manual intervention and reducing the workload of human labor. In addition, the cooperation between the floating guide block 200 and the compression spring 300 to maintain the tension of the chain 202 helps to improve the transmission efficiency of the chain 202, and can also extend its service life and reduce replacement and maintenance costs.

[0044] Specifically, the conveyor line 20 is rotatably mounted on the mounting frame 201, and the two ends are connected in a ring. The support frame 100 is mounted on the mounting frame 201, and a floating guide block 200 is slidably mounted on the support frame 100. The floating guide block 200 slides vertically on the support frame 100 and will not detach from the support frame 100. A compression spring 300 is elastically connected below the mounting frame 201. The compression spring 300 is in a compressed state between the mounting frame 201 and the floating guide block 200, so that the compression spring 300 has... The downward restoring elastic force drives the floating guide block 200 to move downward. The chain 202 passes through the support frame 100 and contacts the bottom wall of the floating guide block 200. Due to the weight of the floating guide block 200 itself and the elastic force of the compression spring 300, it presses the chain 202 downward, thereby keeping the chain 202 in a taut state, which facilitates better operation of the chain 202. The chain 202 can be a roller chain, conveyor chain, toothed chain or double speed chain, etc., and there is no restriction on the type of chain 202.

[0045] Please see Figure 2 In an embodiment of this utility model, the support frame 100 has a sliding groove that extends vertically, and the floating guide block 200 has a sliding position that cooperates with the sliding groove to allow the floating guide block 200 to slide along the support frame 100.

[0046] Specifically, by setting a vertically extending groove on the support frame 100, a vertical track is provided for the floating guide block 200, ensuring the stability and reliability of the floating guide block 200's vertical movement. The vertical length of the groove determines the vertical travel range of the floating guide block 200, that is, it determines the length of the chain 202 that can be accommodated at its loosest or tightest position. One side of the floating guide block 200 has a sliding position, which cooperates with the groove to realize the floating guide block 200 moving along the support frame 100. The vertical movement of the chain is as follows: before initial use, the floating guide block 200 is located at the top or upper part of the slide groove, and the chain 202 is in a pre-tensioned state. As the chain 202 is used for a long time, the tension of the chain 202 decreases, the sliding position slides down, presses the chain 202, until the chain 202 is tightened again and restored to the required tension. The floating guide block 200 can rise and fall according to the tension of the chain 202, so that the chain 202 maintains a proper tension, reduces manual intervention, and lowers the maintenance cost of the chain 202.

[0047] Please see Figure 4 In an embodiment of this utility model, the support frame 100 includes:

[0048] Base plate 110;

[0049] Two upright plates 120 are provided, which are arranged opposite each other on both sides of the base plate 110, and a movable cavity is formed between the two upright plates 120 and the base plate 110. The movable cavity has a first movable opening and a second movable opening opposite each other. The floating guide block 200 is slidably disposed in the movable cavity, and the chain 202 extends into the movable cavity from either the first movable opening or the second movable opening, and extends out from the other of the first movable opening and the second movable opening. The part of the chain 202 in the movable cavity is wrapped around the bottom of the floating guide block 200.

[0050] Specifically, the support frame 100 includes a base plate 110 and upright plates 120. The shape of the base plate 110 is not limited; in this embodiment, the base plate 110 is square. An upright plate 120 is provided on each of the two sides above the base plate 110 and extends upwards. A movable cavity is formed between the two upright plates 120 and the base plate 110. A first movable opening and a second movable opening are configured on opposite sides of the movable cavity. That is, the first movable opening, the second movable opening, and the two upright plates 120 are arranged around the perimeter of the upright plate 120. The movable chain 202 extends into and passes through the movable cavity. The floating guide block 200 is slidably connected to the upright plate 120 within the movable cavity. The upright plate 120 provides guidance and restraint for the floating guide block 200. Through the downward elastic force applied to the floating guide block 200 by the compression spring 300 and the weight of the floating guide block 200 itself, the chain 202 can be automatically tensioned without manual intervention in tension adjustment. This keeps the chain 202 in a taut state, which helps to improve the transmission efficiency of the chain 202 and reduce energy loss.

[0051] Please see Figure 2 and Figure 4 In this embodiment of the invention, the upright plate 120 includes connecting rods 121 extending vertically. Two connecting rods 121 are provided, and the interval between the two connecting rods 121 is configured as a groove, so that the groove also extends vertically. This ensures that the sliding part slides vertically within the groove. The sliding part protrudes from the surface of the floating guide block 200. The width between the two connecting rods 121 needs to be designed according to the size of the sliding part, so as to accommodate the sliding part and allow it to slide smoothly, while also limiting the floating guide block 200 to ensure that it does not wobble horizontally during movement, thus ensuring transmission accuracy. In addition, the edge of the groove can be surface treated, such as by plating or lubrication, to reduce friction and wear between the sliding part and the groove, thereby improving transmission efficiency.

[0052] Please see Figure 3 In an embodiment of this utility model, the floating guide block 200 includes a slide 210, which is arc-shaped and has a mounting surface for winding the chain 202. The middle of the mounting surface is recessed inward to form a groove 220, so that the groove 220 is lower than the mounting surface, and the chain 202 is disposed in the groove 220.

[0053] Specifically, please refer to Figure 3The slide block 210 is the main structure of the floating guide block 200. Its bottom is arc-shaped. The chain 202 is wound around the arc-shaped structure at the bottom of the slide block 210. The arc-shaped structure can better adapt to the bending state of the chain 202, reduce the pressure concentration at the contact point, and connect the chain 202 introduced at various angles. It not only expands the contact area with the chain 202, but also makes the chain 202 pass through the slide block 210 more smoothly when rotating. The arc surface of the slide block 210 is the mounting surface. The center of the mounting surface is recessed inward to form a groove 220. The groove 220 extends along the arc direction of the bottom. The two sides of the groove 220 are higher than the groove 220, providing a space for the chain 202 to be embedded. The chain 202 is just locked in the groove 220, which can prevent the chain 202 from swaying or deviating in the groove 220 during operation, which would affect the accuracy and efficiency of the transmission.

[0054] Please see Figure 3 In an embodiment of this utility model, the floating guide block 200 further includes a limiting block 230, which is configured as a sliding position. The limiting block 230 is located on one side of the slide block 210 and is slidably disposed in the slide groove.

[0055] Specifically, a limiting block 230 is provided on the side of the slide block 210. The limiting block 230 is engaged in the slide groove and slides within the slide groove. The cooperation between the limiting block 230 and the slide groove ensures that the floating guide block 200 can only move in the vertical direction. The width of the slide groove is slightly larger than that of the limiting block 230, so that the limiting block 230 can move vertically within the slide groove while avoiding horizontal deviation, which would affect the accuracy of the chain 202. Preferably, limiting blocks 230 are provided on both sides of the slide block 210 along the first direction. The limiting blocks 230 on both sides slide in cooperation with the slide groove, improving the stability of the floating guide block 200. It should also be noted that limiting parts are provided at the upper and lower ends of the slide groove to limit the maximum range of movement of the limiting block 230 within the slide groove, preventing it from exceeding the safe range and preventing the floating guide block 200 from moving excessively upward or downward.

[0056] Please see Figure 4 In an embodiment of this utility model, a stop block 130 is provided in the slide groove, and the floating guide block 200 further includes a first positioning pin 240 and a second positioning pin. The first positioning pin 240 is inserted into the limiting block 230 along a first direction. The first positioning pin 240 and the second positioning pin are detachably connected to have a locked state and an unlocked state. In the locked state, the second positioning pin is inserted into the first positioning pin 240, and the second positioning pin is engaged at the stop block 130 to limit the floating guide block 200 from sliding downward in the slide groove. In the unlocked state, the second positioning pin is separated from the first positioning pin 240, so that the floating guide block 200 can slide in the slide groove.

[0057] Specifically, please refer to Figure 4 A stop block 130 is provided in the chute, positioned between two connecting rods 121, with its upper end forming a "V" shape. A first positioning pin 240 is inserted in the first direction, horizontally positioned and engaged with the limiting blocks 230 on both sides. The end of the first positioning pin 240 does not protrude beyond the limiting blocks 230. The first positioning pin 240 has a positioning hole along the first direction. Before the chain 202 is loaded, a second positioning pin is inserted into the positioning hole along the first direction, protruding beyond the limiting block 230, and is in a locked state. The floating guide block 200 is moved upward, causing the second positioning pin to engage with the stop block 130, preventing the floating guide block 200 from descending on the support frame 100, thus facilitating the passage of the chain 202 through the first... The movable port and the second movable port are connected to the bottom of the floating guide block 200. After the chain 202 is loaded, the second positioning pin is removed. At this time, there is no second positioning pin engaged at the stop block 130, and the limit block 230 can slide in the groove. Under the downward elastic force of the compression spring 300 and the weight of the floating guide block 200 itself, the floating guide block 200 slides downward until it presses the chain 202. Similarly, when the chain 202 is ready to be unloaded, the floating guide block 200 needs to be pushed upward first. When it reaches above the stop block 130, the second positioning pin is inserted so that it is engaged at the stop block 130 to prevent it from falling. At this time, there is no floating stop block 130 pressing the chain 202 downward, which makes it easy to disassemble the chain 202 for repair or replacement of a new chain 202.

[0058] Please see Figure 3 In an embodiment of this utility model, the floating guide block 200 further includes a mounting part 250, and the automatic tensioning mechanism 10 further includes a guide post 400. The mounting part 250 is mounted on the upper part of the slide block 210. The mounting part 250 has an upward-opening mounting cavity. One end of the guide post 400 is mounted on the mounting bracket 201, and the other end extends into the mounting cavity. The compression spring 300 is sleeved on the outer periphery of the guide post 400, and one end located in the mounting cavity is fixedly connected to the mounting part 250.

[0059] Specifically, a mounting part 250 is provided above the slide 210. The mounting part 250 and the slide 210 can be integrally formed. The mounting part 250 has a cylindrical structure and an upward-opening mounting cavity for fixing the compression spring 300. The upper end of the compression spring 300 is connected to the mounting bracket 201, and the other end is elastically connected to the mounting part 250 in the mounting cavity. The compression spring 300 provides a downward thrust to the floating guide block 200, so that the floating guide block 200 presses the chain 202 downward. This ensures that the compression spring 300 can adjust its state according to the tension of the chain 202, whether the chain 202 is loosening or loosening. For example, when the chain 202 is initially loosening, the compression spring 300 can adjust its state according to the tension of the chain 202. In the initial state, the compression spring 300 is compressed, and the thrust of the compression spring 300, the gravity of the floating guide block 200, and the upward force of the chain 202 are balanced, so the chain 202 is in a taut state. When the chain 202 loosens, the compression spring 300 pushes the floating guide block 200 downward, and the floating guide block 200 slides downward until the chain 202 is in a taut state. The downward push of the floating guide block 200 by the compression spring 300 keeps the chain 202 in a taut state at all times. In addition, the compression spring 300 is sleeved on the outer periphery of the guide post 400. The guide post 400 can act as a guide for the compression spring 300, which can keep the compression spring 300 in a stable state during compression and release, and the direction of force remains unchanged.

[0060] Please see Figure 5 In an embodiment of this utility model, the automatic tensioning mechanism 10 further includes a cover 500, which covers the outer wall of the support frame 100 and is fixedly connected to the mounting frame 201. The cover 500 is provided with a viewing window 510.

[0061] Specifically, by setting a cover 500 outside the support frame 100, with an opening at the top of the cover 500 and connecting to the bottom of the mounting frame 201, the cover 500 and the mounting frame 201 cooperate to enclose the support frame 100 and the internal structures such as the compression spring 300 and the floating guide block 200, which can prevent dust from entering and affecting the up-and-down sliding of the internal floating guide block 200. In addition, a viewing window 510 is set on the cover 500, through which the position of the floating guide block 200 and the tension of the chain 202 can be viewed. As the chain 202 gradually lengthens over time, when it exceeds a certain length, the compression spring 300 no longer has downward elasticity and exceeds the tension range. At this time, the floating guide block 200 can be seen at the bottom through the viewing window 510, so the chain 202 can be replaced or shortened.

[0062] Please see Figure 5In one embodiment of this utility model, the viewing window 510 extends vertically. The vertically positioned viewing window 510 allows for a horizontal view of the position of the bottom end of the chain 202 and the position of the floating guide block 200, thus determining the tension of the chain 202. In another embodiment, multiple viewing windows 510 are spaced apart vertically. When the floating guide block 200 is observed horizontally in the bottommost viewing window 510, the chain 202 is too long and exceeds the tension range of the compression spring 300. In this case, the chain 202 can be replaced or shortened.

[0063] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An automatic tensioning mechanism for a conveyor line, said conveyor line comprising a mounting frame and a chain, said chain being rotatably arranged in said mounting frame, and said chain having an endless structure, characterized in that, The automatic tensioning mechanism includes: A support frame is provided on the mounting frame; A floating guide block is disposed on the support frame and slidably connected to the support frame in the vertical direction; the chain is wound around the bottom of the floating guide block; and A compression spring is elastically connected at both ends to the mounting bracket and the floating guide block, respectively. When the compression spring is in a compressed state, the floating guide block tends to move downward.

2. The self-tensioning mechanism of claim 1, wherein, The support frame has a groove that extends vertically, and the floating guide block has a sliding position that cooperates with the groove to allow the floating guide block to slide along the support frame.

3. The self-tensioning mechanism of claim 2, wherein, The support frame includes: Base plate; Two upright plates are provided, which are arranged opposite each other on both sides of the base plate, and a movable cavity is formed between the two upright plates and the base plate. The movable cavity has a first movable opening and a second movable opening opposite each other. The floating guide block is slidably disposed in the movable cavity, and the chain extends into the movable cavity from either the first movable opening or the second movable opening and extends out from the other of the first movable opening and the second movable opening. The part of the chain in the movable cavity is wrapped around the bottom of the floating guide block.

4. The self-tensioning mechanism of claim 3, wherein, The upright plate includes connecting rods that extend vertically. Two connecting rods are provided, and the interval between the two connecting rods is configured as a groove.

5. The self-tensioning mechanism of claim 2, wherein, The floating guide block includes a slide block, which is arc-shaped and has a mounting surface for winding the chain. The center of the mounting surface is recessed inward to form a groove, such that the groove is lower than the mounting surface, and the chain is disposed in the groove.

6. The self-tensioning mechanism of claim 5, wherein, The floating guide block also includes a limiting block, which is configured as a sliding position. The limiting block is located on one side of the slide block and is slidably disposed within the slide groove.

7. The self-tensioning mechanism of claim 6, wherein, A stop block is provided in the slide groove, and the floating guide block further includes a first positioning pin and a second positioning pin. The first positioning pin is inserted into the limiting block along a first direction. The first positioning pin and the second positioning pin are detachably connected to have a locked state and an unlocked state. In the locked state, the second positioning pin is inserted into the first positioning pin, and the second positioning pin is engaged at the stop block to limit the floating guide block from sliding downward in the slide groove. In the unlocked state, the second positioning pin is separated from the first positioning pin, so that the floating guide block can slide in the slide groove.

8. The self-tensioning mechanism of claim 7, wherein, The floating guide block also includes a mounting part, and the automatic tensioning mechanism also includes a guide post. The mounting part is mounted on the upper part of the slide. The mounting part has an upward-opening mounting cavity. One end of the guide post is mounted on the mounting frame, and the other end extends into the mounting cavity. The compression spring is sleeved on the outer periphery of the guide post, and one end located in the mounting cavity is fixedly connected to the mounting part.

9. An automatic tensioning mechanism according to any one of claims 1 to 8, wherein The automatic tensioning mechanism also includes a cover, which is placed over the outer wall of the support frame and fixedly connected to the mounting frame. The cover is provided with a viewing window.

10. The self-tensioning mechanism of claim 9, wherein, The viewing window extends vertically; or, multiple viewing windows are spaced apart vertically.

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