Non-clearance belt pulley chain pressing device

Abstract

The utility model provides a clearance-free belt pulley chain pressing device which is applied to a belt and comprises a fixed handle, a movable handle and a movable handle. One end of the tensioning arm is arranged on the belt, a rotating hole is formed in the other end of the tensioning arm, the fixed handle is arranged in the rotating hole, and the fixed handle and the tensioning arm are located on the same axis; the tensioning assembly comprises a ratchet wheel and an elastic rolling piece, the ratchet wheel is arranged on the fixed handle in a sleeving mode, one end of the elastic rolling piece is arranged on the peripheral face of the ratchet wheel, and the other end of the elastic rolling piece is attached to the inner wall of the rotating hole. The stability and reliability of a belt transmission system are improved, the maintenance cost is reduced, the downtime is shortened, and the problem that an existing chain pressing device cannot be quickly locked and automatically adjust the tightness degree when a belt is loosened is effectively solved.

Description

Technical Field

[0001] This application relates to the field of chain pressers, and more particularly to a chain presser with a pulley without misalignment. Background Technology

[0002] Belt drive systems are widely used in mechanical equipment, and their stability depends on the reliability of the belt tensioning device. However, during long-term operation, the belt may loosen due to wear, stretching, or vibration, leading to decreased transmission efficiency, slippage, or even tooth skipping. Existing solutions use a chain clamp to lock the belt and prevent loosening.

[0003] Many existing chain tensioners employ a single locking principle, such as tensioning via threaded adjustment or a simple snap-lock mechanism. While these designs can meet basic tension requirements to some extent, they often lack a self-compensating mechanism, meaning they cannot automatically adjust themselves when the belt loosens due to prolonged use or external factors. This deficiency necessitates frequent checks and manual adjustments of tension by maintenance personnel, increasing maintenance costs and downtime, and reducing production efficiency.

[0004] Therefore, there is an urgent need for a chain clamp that can quickly lock and automatically adjust the belt tension when the belt is slack. Utility Model Content

[0005] In view of this, it is necessary to provide a chain clamp that can quickly lock and automatically adjust the belt tension when the belt is slack, in order to solve the above problems.

[0006] Embodiments of this application provide a non-misaligned pulley chain clamp, applied to a belt, the chain clamp comprising:

[0007] Fixed handle;

[0008] The tensioning arm has one end attached to the belt and the other end has a rotating hole. The fixed handle is located in the rotating hole and is on the same axis as the tensioning arm.

[0009] The tensioning assembly includes a ratchet and an elastic rolling element. The ratchet is sleeved on the fixed handle. One end of the elastic rolling element is located on the outer circumferential surface of the ratchet, and the other end is attached to the inner wall of the rotating hole. When the tensioning arm rotates around the ratchet in a first direction, the elastic rolling element can lock the ratchet and the tensioning arm. When the tensioning arm rotates in a second direction opposite to the first direction, the tensioning arm can push the elastic rolling element to slide, thereby tightening the belt.

[0010] In at least one embodiment of this application, a limiting groove is formed on the outer peripheral surface of the ratchet, the opening of the limiting groove is disposed facing the inner wall of the rotating hole, and the elastic rolling element is disposed in the limiting groove.

[0011] The limiting groove has a first inclined surface and a second inclined surface that intersects and connects with the first inclined surface.

[0012] In at least one embodiment of this application, the elastic rolling element includes a spring element and a rolling column. The rolling column is disposed on the second inclined surface. One end of the spring element is disposed on the first inclined surface, and the other end is slidably disposed on the rolling column. Along the elastic direction of the spring element, the spring element can make the rolling column fit against the second inclined surface and the inner wall of the rotating hole.

[0013] In at least one embodiment of this application, the second inclined surface is spaced apart from the inner wall of the rotating hole, and a narrowing portion and a rolling portion are formed between the second inclined surface and the inner wall of the rotating hole. When the tensioning arm rotates in the first direction, the rolling column is disposed in the narrowing portion. When the tensioning arm rotates in the second direction, the rolling column is disposed in the rolling portion, so that the tensioning arm slides with the ratchet.

[0014] In at least one embodiment of this application, the length of the first inclined surface is less than the length of the second inclined surface along the radial direction of the ratchet.

[0015] In at least one embodiment of this application, the ratchet is further provided with a fixing port, the fixing port is located on the central axis of the ratchet, and the fixing handle is located inside the fixing port.

[0016] In at least one embodiment of this application, the tensioning arm has a first surface and a second surface disposed opposite to the first surface, the fixed handle and the rotating hole are disposed on the first surface, the second surface has a connecting arm, and the connecting arm is pressed onto the belt.

[0017] In at least one embodiment of this application, the connecting arm includes a connecting rod and a sliding rod, the sliding rod is sleeved on the connecting rod, and the sliding rod is located at the end of the connecting rod away from the first surface, and the sliding rod is in contact with the belt.

[0018] In at least one embodiment of this application, the fixed handle has a fixed part and a rotating part. The fixed part is located at one end of the fixed handle away from the rotating part and is fixedly disposed. The rotating part is attached to the first surface and is directly opposite the setting of the rotating hole.

[0019] In at least one embodiment of this application, the rotating part has a fixing rod that extends into the fixing port and is connected to the ratchet.

[0020] The aforementioned zero-play belt pulley chain tensioner, through the synergistic action of the fixed handle and tensioning arm, combined with a tensioning assembly consisting of a ratchet and an elastic rolling element, achieves both automatic adjustment and manual fine-tuning of belt tension. When the belt loosens due to wear, stretching, or vibration, the tensioning arm can rotate around the ratchet in a specific direction (first direction). At this time, the elastic rolling element locks the ratchet and tensioning arm, achieving one-way locking of the ratchet. Conversely, when the tensioning arm can rotate in the opposite direction (second direction), it pushes the elastic rolling element to slide, automatically tightening the belt. This not only improves the stability and reliability of the belt drive system and reduces maintenance costs and downtime, but also effectively solves the problem that existing chain tensioners cannot quickly lock and automatically adjust tension when the belt is loose. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a chain presser with a zero-misalignment pulley in an embodiment of this application.

[0022] Figure 2 An exploded view of the first face of the fixed handle, tensioning arm, and tensioning assembly.

[0023] Figure 3 This is a structural diagram of the fixed handle, tensioning arm, and connecting arm.

[0024] Figure 4 for Figure 3 Cross-sectional view of AA.

[0025] Figure 5 for Figure 3 Cross-sectional view of BB in the middle.

[0026] Figure 6 for Figure 5 A partially enlarged schematic diagram of the C-structure.

[0027] Figure 7 An exploded view of the second side of the fixed handle, tensioning arm, and tensioning assembly.

[0028] Explanation of main component symbols

[0029] 100. A non-misaligned pulley chain press; 10. Belt; 20. Fixed handle; 21. Fixed part; 22. Rotating part; 221. Fixed rod; 30. Tensioning arm; 31. Rotating hole; 32. First surface; 33. Second surface; 34. Connecting arm; 341. Connecting rod; 342. Sliding rod; 40. Tensioning assembly; 41. Ratchet; 411. Limiting groove; 4111. First inclined surface; 4112. Second inclined surface; 4113. Narrowing part; 4114. Rolling part; 4115. Fixed opening; 42. Elastic rolling element; 421. Spring element; 422. Rolling column; F1. First direction; F2. Second direction. Detailed Implementation

[0030] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0031] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0032] Embodiments of this application provide a chain presser with a pulley without misalignment.

[0033] The aforementioned zero-play belt pulley chain tensioner, through the synergistic action of the fixed handle and tensioning arm, combined with a tensioning assembly consisting of a ratchet and an elastic rolling element, achieves both automatic adjustment and manual fine-tuning of belt tension. When the belt loosens due to wear, stretching, or vibration, the tensioning arm can rotate around the ratchet in a specific direction (first direction). At this time, the elastic rolling element locks the ratchet and tensioning arm, achieving one-way locking of the ratchet. Conversely, when the tensioning arm can rotate in the opposite direction (second direction), it pushes the elastic rolling element to slide, automatically tightening the belt. This not only improves the stability and reliability of the belt drive system and reduces maintenance costs and downtime, but also effectively solves the problem that existing chain tensioners cannot quickly lock and automatically adjust tension when the belt is loose.

[0034] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] according to Figures 1-7 This application provides a chain presser 100 for a belt 10 with no misalignment, which is applied to the belt 10. The chain presser includes a fixed handle 20, a tensioning arm 30 and a tensioning assembly 40.

[0036] The tensioning arm 30 has one end mounted on the belt 10, and the other end of the tensioning arm 30 has a rotating hole 31. The fixed handle 20 is located inside the rotating hole 31, and the fixed handle 20 and the tensioning arm 30 are located on the same axis. The tensioning assembly 40 includes a ratchet 41 and an elastic rolling element 42. The ratchet 41 is sleeved on the fixed handle 20. One end of the elastic rolling element 42 is located on the outer circumferential surface of the ratchet 41, and the other end is attached to the inner wall of the rotating hole 31. When the tensioning arm 30 rotates around the ratchet 41 in a first direction F1, the elastic rolling element 42 can lock the ratchet 41 and the tensioning arm 30. When the tensioning arm 30 rotates in a second direction F2, which is opposite to the first direction F1, the tensioning arm 30 can push the elastic rolling element 42 to slide, thereby tightening the belt 10.

[0037] It should be noted that a belt with no play refers to the belt 10 maintaining a tight fit during transmission, without any looseness, slippage, or excessive gap (i.e., "play") between the belt 10 pulley and the belt 10, thus ensuring high efficiency and accuracy of transmission.

[0038] In this application, the belt 10 is placed on a horizontal surface, and along the horizontal transmission direction of the belt 10, the tension arm 30 is attached to the underside of the belt 10. By adjusting the position of the tension arm 30, the tension of the belt 10 is adjusted. The fixed handle 20 can be fixedly installed on the frame to provide a stable installation position for the entire chain press, ensuring that the tension arm 30 and the tensioning assembly 40 move around the same axis, avoiding wear or adjustment failure caused by structural misalignment.

[0039] Specifically, the ratchet 41 is fixedly connected to the fixed handle 20, so that the ratchet 41 is fixed on the fixed handle 20. The tensioning arm 30 rotates around the fixed handle 20 via the ratchet 41, and the tensioning arm 30 directly acts on the belt 10, changing the tension of the belt 10 by adjusting its position.

[0040] Furthermore, the ratchet 41 and the elastic rolling element 42 are installed in the rotating hole 31 within the tensioning mechanism, allowing the tensioning arm 30 to rotate freely in only one direction. When the tensioning arm 30 moves in the opposite direction, the elastic rolling element 42 locks and fixes the handle 20 and the tensioning arm 30, preventing the tensioning arm 30 from rotating in the opposite direction and preventing them from sliding relative to each other, thereby preventing the belt 10 from slipping. It should be noted that in this embodiment, the first direction F1 is when the belt 10 is slack, the tensioning arm 30 at one end of the belt 10 is affected by the slack of the belt 10, causing the other end of the tensioning arm 30 to rotate around the ratchet 41 in the first direction F1, and the second direction F2 is the direction opposite to the first direction F1.

[0041] Furthermore, when the belt 10 is slack, the tensioning arm 30 rotates around one end of the fixed handle 20 in the first direction F1. At this time, the elastic rolling element 42 that is in contact with the inner wall of the tensioning arm 30 also rotates in the first direction F1. The elastic rolling element 42 that is in contact with the outer circumference of the ratchet 41 continues to slide in the first direction F1. The elastic rolling element 42 will follow this movement and lock the ratchet 41 and the tensioning arm 30 in this process to ensure that their relative positions are fixed and to prevent the tensioning arm 30 from rotating in the first direction F1, thereby preventing the belt 10 from slack.

[0042] Furthermore, when the tension arm 30 rotates around the fixed handle 20 in the second direction F2, the elastic rolling element 42 that is in contact with the inner wall of the tension arm 30 also rotates in the second direction F2. The elastic rolling element 42 that is in contact with the outer circumference of the ratchet 41 continues to slide in the second direction F2. The elastic rolling element 42 will follow this movement, so that the tension arm 30 and the ratchet 41 can slide relative to each other, thereby adjusting the tension of the belt 10.

[0043] In one specific embodiment, the ratchet 41 has a limiting groove 411, the opening of the limiting groove 411 is disposed facing the inner wall of the rotating hole 31, and the elastic rolling element 42 is disposed in the limiting groove 411; wherein, the limiting groove 411 has a first inclined surface 4111 and a second inclined surface 4112 that intersects and connects with the first inclined surface 4111.

[0044] Specifically, the limiting groove 411 on the ratchet 41 faces the inner wall of the rotating hole 31, forming a mating space with the elastic rolling element 42. When the tensioning arm 30 rotates, the elastic rolling element 42 is always restricted between the limiting groove 411 and the inner wall of the rotating hole 31, ensuring a compact structure and controllable movement trajectory.

[0045] In one specific embodiment, the elastic rolling element 42 includes a spring element 421 and a rolling column 422. The rolling column 422 is disposed on the second inclined surface 4112. One end of the spring element 421 is disposed on the first inclined surface 4111, and the other end is slidably disposed on the rolling column 422. Along the elastic direction of the spring element 421, the spring element 421 can make the rolling column 422 fit against the second inclined surface 4112 and the inner wall of the rotating hole 31.

[0046] Specifically, the rolling column 422 is directly placed on the second inclined surface 4112 of the ratchet 41 limiting groove 411, serving as the core force transmission element. Its outer surface maintains line contact with the inner wall of the rotating hole 31 and the outer surface of the ratchet 41, ensuring concentrated and stable frictional force during reverse locking. One end of the spring member 421 abuts against the first inclined surface 4111 of the limiting groove 411, and the other end is sleeved in the axial groove of the rolling column 422, forming a retractable elastic support structure. This allows the spring member 421 to push the rolling column 422 along the second inclined surface 4112 toward the depth of the limiting groove 411, so that the outer surface of the rolling column 422 contacts the inner wall of the rotating hole 31 and the outer surface of the ratchet 41.

[0047] Furthermore, the rolling pin 422 is disposed within the rotating hole 31, such that the rolling pin 422 and the tensioning arm 30 roll in the same direction. When the tensioning arm 30 rotates along the first direction F1, the rolling pin 422 also rotates along the first direction F1. Simultaneously, when the rolling pin 422 on the second inclined surface 4112 rotates along the first direction F1, the rolling pin 422 rotates in a direction away from the first inclined surface 4111. The rolling pin 422 slides to a depth where the second inclined surface 4112 intersects with the inner wall of the rotating hole 31, thereby achieving one-way locking between the ratchet 41 and the tensioning arm 30, thus preventing the tensioning arm 30 from rotating along the first direction F1.

[0048] Furthermore, when the tensioning arm 30 rotates along the second direction F2, the rolling column 422 also rotates along the second direction F2. At the same time, when the rolling column 422 on the second inclined surface 4112 rotates along the second direction F2, the rolling column 422 rotates in the direction close to the first inclined surface 4111. The rolling column 422 slides to the width where the second inclined surface 4112 intersects with the inner wall of the rotating hole 31, thereby realizing the relative sliding between the ratchet 41 and the tensioning arm 30, and thus adjusting the tension of the belt 10.

[0049] Furthermore, the rolling column 422 is disposed in the rotating hole 31, so that the rolling column 422 and the tensioning arm 30 roll in the same direction. When the rolling column 422 rotates in the direction toward the first inclined surface 4111, the rolling column 422 can be blocked by the second inclined surface 4112, so that the rolling column 422 cannot leave the limiting groove 411 through the groove.

[0050] In one specific embodiment, the second inclined surface 4112 is spaced apart from the inner wall of the rotating hole 31, and a narrowing portion 4113 and a rolling portion 4114 are formed between the second inclined surface 4112 and the inner wall of the rotating hole 31. When the tensioning arm 30 rotates along the first direction F1, the rolling column 422 is disposed in the narrowing portion 4113 so that the rolling column 422 clamps the ratchet 41 and the tensioning arm 30. When the tensioning arm 30 rotates along the second direction F2 opposite to the first direction F1, the rolling column 422 is disposed in the rolling portion 4114 so that the tensioning arm 30 slides with the ratchet 41.

[0051] Specifically, the narrowing portion 4113 is located on the side of the second inclined surface 4112 away from the first inclined surface 4111, and is a narrow area between the second inclined surface 4112 and the inner wall of the rotating hole 31. Its axial width is less than or equal to the diameter of the rolling column 422, forming a mechanical clamping space. The rolling portion 4114 is located on the side of the second inclined surface 4112 closer to the first inclined surface 4111, and is a wide area at the end of the narrowing portion 4113. Its width is greater than the diameter of the rolling column 422, allowing the rolling column 422 to roll freely.

[0052] Furthermore, when the tensioning arm 30 rotates along the first direction F1, the rolling column 422 is pushed into the narrowing portion 4113 by the spring member 421, and its outer surface forms a three-point contact with the second inclined surface 4112 and the inner wall of the rotating hole 31, thereby locking the ratchet 41 and the tensioning arm 30. When the tensioning arm 30 rotates along the second direction F2, the rolling column 422 compresses the spring member 421, and the inner wall of the rotating hole 31 slides the rolling column 422 along the rolling portion 4114, thereby causing the tensioning arm 30 to continue rotating along the second direction F2.

[0053] In one specific embodiment, the length of the first inclined surface 4111 is less than the length of the second inclined surface 4112 along the radial direction of the ratchet 41. Specifically, the second inclined surface 4112 is the plane on which the rolling column 422 slides, and its length along the radial direction of the ratchet 41 is longer, providing a greater rolling stroke for the rolling column 422.

[0054] In one specific embodiment, the ratchet 41 is further provided with a fixing port 4115, the fixing port 4115 is located on the central axis of the ratchet 41, and the fixing handle 20 is located inside the fixing port 4115.

[0055] Specifically, the fixing port 4115 is located at the central axis of the ratchet 41, passes through the ratchet 41 body, and forms an assembly and fixation that matches the fixing handle 20. The fixing handle 20 passes through the fixing port 4115 and fixes the ratchet 41 by welding or the like, so that the tensioning arm 30 rotates around the ratchet 41.

[0056] In one specific embodiment, the tensioning arm 30 has a first surface 32 and a second surface 33 opposite to the first surface 32. The fixed handle 20 and the rotating hole 31 are disposed on the first surface 32. The second surface 33 has a connecting arm 34, which is pressed onto the belt 10.

[0057] Specifically, the first surface 32 of the tensioning arm 30 is one of its main working surfaces, used for installing and fixing other components. The second surface 33, opposite to the first surface 32, also performs an important function, used for installing and fixing other components. In this embodiment, the second surface 33 is provided with a connecting arm 34 for contacting and pressing against the belt 10.

[0058] Furthermore, the fixed handle 20 may require a certain amount of swing space during operation, and the connecting arm 34, pressed onto the belt 10, also needs a certain range of motion. The relative arrangement of the first surface 32 and the second surface 33 avoids spatial interference between functional components on the two mounting surfaces, improving the overall structural compactness and stability. By placing the fixed handle 20 and the rotating hole 31 on the first surface 32, it facilitates direct external operation by the operator, improving operational convenience and efficiency.

[0059] In one specific embodiment, the connecting arm 34 includes a connecting rod 341 and a sliding rod 342. The sliding rod 342 is sleeved on the connecting rod 341, and the sliding rod 342 is located at the end of the connecting rod 341 away from the first surface 32. The sliding rod 342 is in contact with the belt 10.

[0060] Specifically, the connecting rod 341, as the main body of the connecting arm 34, provides a stable support structure and is connected to the second surface 33 of the tensioning arm 30, ensuring that the connecting arm 34 can be securely installed on the tensioning arm 30. The sliding rod 342 is sleeved on the connecting rod 341 and can slide relative to the connecting rod 341, allowing the sliding rod 342 to directly apply pressure to the belt 10. This ensures that the sliding rod 342 remains in contact with the belt 10 during adjustment, thereby effectively transmitting tension.

[0061] In one specific embodiment, the fixed handle 20 has a fixed part 21 and a rotating part 22. The fixed part 21 is located at the end of the fixed handle 20 away from the rotating part 22 and is fixedly disposed. The rotating part 22 is attached to the first surface 32 and is directly opposite the setting of the rotating hole 31.

[0062] Specifically, the fixed part 21 is located away from the rotating part 22, avoiding the influence of rotation on the fixed part 21 and ensuring the stability and reliability of the fixed handle 20. The fixed part 21 is fixedly positioned so that the fixed handle 20 can be securely installed on the equipment, preventing it from loosening or falling off. The rotating part 22 is fitted against the first surface 32, ensuring close contact between the rotating part 22 and the equipment, improving the smoothness of rotation. The rotating part 22 is positioned directly opposite the rotating hole 31, allowing it to be accurately inserted into the rotating hole 31 to achieve the rotation function.

[0063] In one specific embodiment, the rotating part 22 has a fixing rod 221, which extends into the fixing port 4115 and is connected to the ratchet 41.

[0064] Specifically, the rotating part 22 of the fixed handle 20 has a fixed rod 221. The fixed rod 221 is columnar and its diameter matches the size of the fixed opening 4115 on the ratchet 41, ensuring that it can be smoothly inserted into the fixed opening 4115, so that the fixed rod 221 and the inside of the ratchet 41 form a tight fixed connection.

[0065] Furthermore, the fixing rod 221 extends into the fixing port 4115 and connects to the ratchet 41, enhancing the connection strength between the fixing handle 20 and the ratchet 41. During the operation of the chain press, the tensioning arm 30 rotates around the ratchet 41, and the fixing handle 20 needs to withstand the torque and various external forces from the tensioning arm 30. This strong connection structure can effectively transmit external forces to the ratchet 41, preventing relative slippage or loosening between the fixing handle 20 and the ratchet 41, and ensuring the stable operation of the chain press.

[0066] Therefore, the aforementioned belt tensioner 100 with no play in the belt 10 achieves both automatic adjustment and manual fine-tuning of belt 10 tension through the coordinated action of the fixed handle 20 and the tensioning arm 30, combined with the tensioning assembly 40 consisting of the ratchet 41 and the elastic rolling element 42. When the belt 10 becomes loose due to wear, stretching, or vibration, the tensioning arm 30 can rotate around the ratchet 41 in a specific direction (first direction F1). At this time, the elastic rolling element 42 locks the ratchet 41 and the tensioning arm 30, achieving one-way locking of the ratchet 41. Conversely, when the tensioning arm 30 can rotate in the opposite direction (second direction F2), it pushes the elastic rolling element 42 to slide, automatically tightening the belt 10. This not only improves the stability and reliability of the belt 10 transmission system and reduces maintenance costs and downtime, but also effectively solves the problem that existing belt tensioners cannot quickly lock and automatically adjust the tension when the belt 10 is loose.

[0067] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A zero-misalignment pulley chain presser, applied to belts, characterized in that, The chain press includes: Fixed handle; The tensioning arm has one end attached to the belt and the other end has a rotating hole. The fixed handle is located in the rotating hole and is on the same axis as the tensioning arm. The tensioning assembly includes a ratchet and an elastic rolling element. The ratchet is sleeved on the fixed handle. One end of the elastic rolling element is located on the outer circumferential surface of the ratchet, and the other end is attached to the inner wall of the rotating hole. When the tensioning arm rotates around the ratchet in a first direction, the elastic rolling element can lock the ratchet and the tensioning arm. When the tensioning arm rotates in a second direction opposite to the first direction, the tensioning arm can push the elastic rolling element to slide, thereby tightening the belt.

2. A belt tensioner according to claim 1, wherein A limiting groove is formed on the outer peripheral surface of the ratchet, and the opening of the limiting groove is arranged facing the inner wall of the rotating hole. The elastic rolling element is disposed in the limiting groove. The limiting groove has a first inclined surface and a second inclined surface that intersects and connects with the first inclined surface.

3. A belt tensioner according to claim 2, wherein the spring is a torsion spring. The elastic rolling element includes a spring and a rolling column. The rolling column is disposed on the second inclined surface. One end of the spring is disposed on the first inclined surface, and the other end is slidably disposed on the rolling column. Along the elastic direction of the spring, the spring can make the rolling column fit against the second inclined surface and the inner wall of the rotating hole.

4. A belt tensioner according to claim 3, wherein the spring is a torsion spring. The second inclined surface is spaced apart from the inner wall of the rotating hole, and a narrowing portion and a rolling portion are formed between the second inclined surface and the inner wall of the rotating hole. When the tensioning arm rotates in the first direction, the rolling column is located in the narrowing portion. When the tensioning arm rotates in the second direction, the rolling column is located in the rolling portion, so that the tensioning arm slides with the ratchet.

5. A belt tensioner according to claim 2, wherein: Along the radial direction of the ratchet, the length of the first inclined surface is less than the length of the second inclined surface.

6. A belt tensioner according to claim 1, wherein The ratchet also has a fixing port, which is located on the central axis of the ratchet, and the fixing handle is located inside the fixing port.

7. A belt tensioner of claim 6 wherein, The tensioning arm has a first surface and a second surface opposite to the first surface. The fixed handle and the rotating hole are located on the first surface, and the second surface has a connecting arm that is pressed onto the belt.

8. A chain presser with zero misalignment of the pulley according to claim 7, characterized in that, The connecting arm includes a connecting rod and a sliding rod. The sliding rod is sleeved on the connecting rod and is located at the end of the connecting rod away from the first surface. The sliding rod is in contact with the belt.

9. A belt tensioner according to claim 7, wherein the spring is a torsion spring. The fixed handle has a fixed part and a rotating part. The fixed part is located at the end of the fixed handle away from the rotating part and is fixedly installed. The rotating part is attached to the first surface and is directly opposite the rotating hole.

10. A belt tensioner according to claim 9, wherein the spring is a torsion spring. The rotating part has a fixing rod that extends into the fixing port and is connected to the ratchet.

Images