Adjustable pitch chain and sprocket drive

Abstract

The utility model provides a kind of adjustable pitch's chain sprocket drive structure, comprising: mounting bracket, rotationally connected with rotating shaft on mounting bracket, and driving sprocket is installed on rotating shaft, and guiding slot is opened in mounting bracket surface, and guiding block is slidably connected in guiding slot, and driven sprocket is rotationally connected on guiding block, and the combination and thread transmission of screw rod and hand wheel can realize the fine adjustment of the distance between driving sprocket and driven sprocket, only need to rotate hand wheel when operating can drive guiding block to slide along guiding slot stably, without disassembling core component, and adjustment efficiency is greatly improved, while the self-locking characteristic of screw rod, the distance after adjustment can be firmly locked, resist displacement risk caused by equipment vibration, can be flexibly adapted to different chain length, different transmission ratio's use scene, and universality is significantly enhanced.

Description

Technical Field

[0001] This utility model relates to the field of chain and sprocket transmission technology, specifically to a chain and sprocket transmission structure with adjustable pitch. Background Technology

[0002] Chain and sprocket drives, with their advantages of high transmission efficiency, strong load-bearing capacity, and wide adaptability, are widely used in industrial machinery, conveying equipment, machine tools, and construction machinery, and are one of the core components of power transmission. In practical applications, different equipment or different operating conditions of the same equipment often require adjustments to the sprocket spacing to adapt to different transmission ratios and chain lengths, or to address tension compensation needs after chain wear. Furthermore, as a consumable component, the chain needs to be disassembled and replaced periodically to ensure transmission reliability.

[0003] Existing chain and sprocket drive structures have significant technical shortcomings: traditional structures are mostly designed with a fixed spacing. If the spacing needs to be adjusted, multiple components such as sprockets and frames need to be disassembled and repositioned. This is cumbersome and has low adjustment accuracy, which can easily lead to the misalignment of the center surfaces of the two sprockets, causing problems such as uneven chain wear and chain skipping. Utility Model Content

[0004] The present invention aims to solve the problems mentioned in the background art by providing an adjustable-pitch chain and sprocket transmission structure.

[0005] The specific technical solution is as follows: An adjustable-pitch chain and sprocket drive structure includes: a mounting frame, a rotating shaft rotatably connected to the mounting frame, a driving sprocket mounted on the rotating shaft, a guide groove formed on the surface of the mounting frame, a guide block slidably connected in the guide groove, a driven sprocket rotatably connected to the guide block, the driven sprocket and the driving sprocket being connected by a chain drive, a lead screw threadedly connected in the guide groove, one end of the lead screw extending through the outer wall of the mounting frame to the outside, and a handwheel fixedly connected to one end of the lead screw.

[0006] In the aforementioned adjustable-pitch chain and sprocket drive structure, mounting blocks are symmetrically arranged on the surface of the mounting frame, and mounting holes are provided on the mounting blocks.

[0007] In the above-mentioned adjustable-pitch chain and sprocket drive structure: a first rotating frame is rotatably connected to one side of the mounting frame, the first rotating frame is coaxially arranged with the drive sprocket, a second rotating frame is rotatably connected to one side of the first rotating frame, the second rotating frame is rotatably connected to the guide block, an adjusting block is rotatably connected to the other side of the first rotating frame, a tensioning sprocket is rotatably connected to the surface of the adjusting block, and the tensioning sprocket is engaged with the chain.

[0008] In the aforementioned adjustable-pitch chain and sprocket drive structure, both the drive sprocket and the rotating shaft are provided with fixing holes, and locking bolts are installed in the fixing holes.

[0009] In the aforementioned adjustable-pitch chain and sprocket drive structure, the outer peripheral wall of the handwheel is provided with uniformly distributed anti-slip textures.

[0010] In the aforementioned adjustable-pitch chain sprocket drive structure, the outer peripheral wall of the tensioning sprocket is provided with a tooth groove that matches the chain pitch, and the inner wall of the tooth groove is provided with a wear-resistant coating.

[0011] In the aforementioned adjustable-pitch chain and sprocket drive structure, a bearing is provided at the connection between the rotating shaft and the mounting frame, the outer ring of the bearing is interference-fitted with the mounting frame, and the inner ring of the bearing is interference-fitted with the rotating shaft.

[0012] This utility model has the following beneficial effects: By combining a lead screw and a handwheel with a threaded transmission, the distance between the driving sprocket and the driven sprocket can be finely adjusted. During operation, simply turning the handwheel is enough to drive the guide block to slide smoothly along the guide groove without disassembling the core components, which greatly improves the adjustment efficiency. At the same time, the self-locking characteristic of the lead screw can firmly lock the adjusted distance and resist the displacement risk caused by equipment vibration. It can flexibly adapt to different chain lengths and different transmission ratios, significantly enhancing its versatility.

[0013] With the first rotating frame coaxially arranged with the drive sprocket, and the linkage structure between the second rotating frame and the guide block, it can synchronously and adaptively swing with the sprocket pitch adjustment, ensuring that the tensioning sprocket is always tightly engaged with the chain, continuously compensating for changes in chain tension, effectively preventing chain skipping, chain slippage, and abnormal transmission noise. The tooth grooves of the tensioning sprocket are precisely matched with the chain pitch, and the inner wall of the tooth grooves is equipped with a wear-resistant coating, further improving meshing stability and component wear resistance. The first rotating frame and the drive sprocket can be quickly separated by locking bolts, releasing the linkage between the tensioning assembly and the guide block, leaving ample operating space for chain replacement, simplifying maintenance procedures, and ensuring that the chain and sprocket are always in the optimal meshing state during transmission, reducing wear and extending the service life of transmission components. Attached Figure Description

[0014] Figure 1 A schematic diagram of an adjustable-pitch chain and sprocket drive structure provided for an embodiment of this utility model; Figure 2 A schematic diagram of the back of the mounting bracket for an adjustable-pitch chain and sprocket drive structure provided in an embodiment of this utility model; Figure 3 A schematic diagram of the guide groove in an adjustable-pitch chain and sprocket transmission structure provided for an embodiment of this utility model; Figure 4This is a schematic diagram of the chain structure in an adjustable-pitch chain and sprocket transmission structure provided in an embodiment of the present utility model.

[0015] In the attached image: 1. Mounting bracket; 2. Drive sprocket; 3. Guide groove; 4. Driven sprocket; 5. Chain; 6. Guide block; 7. Handwheel; 8. Mounting block; 9. Adjusting block; 10. Tensioning sprocket; 11. First rotating frame; 12. Second rotating frame; 13. Lead screw; 14. Rotating shaft; 15. Locking bolt; 16. Fixing hole. Detailed Implementation

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0018] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Example This embodiment provides an adjustable-pitch chain and sprocket drive structure, such as... Figures 1-4As shown, it includes: a mounting frame 1, a rotating shaft 14 rotatably connected to the mounting frame 1, a drive sprocket 2 mounted on the rotating shaft 14, a guide groove 3 opened on the surface of the mounting frame 1, a guide block 6 slidably connected in the guide groove 3, a driven sprocket 4 rotatably connected to the guide block 6, the driven sprocket 4 and the drive sprocket 2 are connected by a chain 5, a lead screw 13 is threaded in the guide groove 3, one end of the lead screw 13 extends through the outer wall of the mounting frame 1 to the outside, and a handwheel 7 is fixedly connected to one end of the lead screw 13.

[0021] An adjustable-pitch chain sprocket transmission structure employing the above technical solution achieves fine-tuning of the pitch between the driving sprocket 2 and the driven sprocket 4 through the combination of the lead screw 13 and the handwheel 7 and the threaded transmission. During operation, only the handwheel 7 needs to be turned to drive the guide block 6 to slide smoothly along the guide groove 3 without disassembling the core components, thus greatly improving the adjustment efficiency. At the same time, the self-locking characteristic of the lead screw 13 can firmly lock the adjusted pitch, resisting the displacement risk caused by equipment vibration. It can flexibly adapt to different chain lengths and different transmission ratios, significantly enhancing its versatility.

[0022] With the first rotating frame 11 coaxially set with the drive sprocket 2, and in conjunction with the linkage structure of the second rotating frame 12 and the guide block 6, it can synchronously and adaptively swing with the adjustment of the sprocket spacing, so that the tensioning sprocket 10 is always tightly engaged with the chain 5, continuously compensating for changes in the tension of the chain 5, effectively avoiding chain skipping, chain derailment, and abnormal transmission noise. The tooth groove of the tensioning sprocket 10 is precisely matched with the pitch of the chain 5, and the inner wall of the tooth groove is provided with a wear-resistant coating, further improving the meshing stability and wear resistance of the components. The first rotating frame 11 and the drive sprocket 2 can be quickly separated by the locking bolt 15, releasing the linkage between the tensioning component and the guide block 6, leaving sufficient operating space for the replacement of the chain 5, simplifying the maintenance process, and ensuring that the chain 5 and the sprocket are always in the optimal meshing state during the transmission process, reducing wear and extending the service life of the transmission components.

[0023] To ensure stable installation and adaptability to various scenarios, mounting blocks 8 are symmetrically arranged on the surface of the mounting frame 1, with mounting holes on each block. The symmetrically distributed mounting blocks 8 provide a stable installation reference, and the mounting holes are compatible with various fixing methods such as bolts and rivets. This allows the device to be securely installed in the preset positions on different equipment racks, preventing overall vibration or displacement of the device during transmission and improving structural stability and installation versatility.

[0024] To achieve adaptive tensioning of chain 5 and ensure transmission stability, a first rotating frame 11 is rotatably connected to one side of the mounting frame 1. The first rotating frame 11 is coaxially arranged with the drive sprocket 2. A second rotating frame 12 is rotatably connected to one side of the first rotating frame 11 and is rotatably connected to the guide block 6. An adjusting block 9 is rotatably connected to the other side of the first rotating frame 11. A tensioning sprocket 10 is rotatably connected to the surface of the adjusting block 9 and meshes with chain 5. The coaxial design of the first rotating frame 11 and the drive sprocket 2 ensures that the tensioning assembly and the transmission sprocket are on the same plane. When the guide block 6 slides to adjust the spacing, the second rotating frame 12 drives the first rotating frame 11 to swing synchronously, so that the tensioning sprocket 10 always fits against chain 5 and compensates for changes in tension, effectively preventing chain skipping and chain derailment, and improving transmission reliability.

[0025] To ensure secure fixing and convenient disassembly and maintenance of the drive sprocket 2, both the drive sprocket 2 and the rotating shaft 14 are provided with fixing holes 16, on which locking bolts 15 are installed. The locking bolts 15 securely connect the drive sprocket 2 and the rotating shaft 14 via the lead screw 13, preventing relative slippage between the two during transmission. Removing the locking bolts 15 allows for quick separation of the drive sprocket 2 from the first rotating frame 11, releasing the tensioning assembly linkage and providing operational space for chain 5 replacement and sprocket maintenance, thus simplifying the maintenance process.

[0026] To improve the ease of operation and anti-slip properties of handwheel 7, the outer peripheral wall of handwheel 7 is provided with evenly distributed anti-slip textures. The anti-slip textures increase the friction between the hand and handwheel 7, making it less prone to slipping during rotation and adjustment, allowing operators to apply force with less effort, and improving the efficiency and safety of distance adjustment.

[0027] To enhance the meshing stability between the tension sprocket 10 and the chain 5 and extend their service life, the outer peripheral wall of the tension sprocket 10 is provided with tooth grooves that match the pitch of the chain 5, and the inner wall of the tooth grooves is coated with a wear-resistant coating. The tooth grooves with matching pitch allow the tension sprocket 10 and the chain 5 to mesh precisely, avoiding slippage or jamming during meshing. The wear-resistant coating reduces frictional wear between the tooth grooves and the chain 5, extending the service life of the tension sprocket 10 and reducing the frequency of maintenance.

[0028] To reduce rotational friction of the rotating shaft 14 and improve transmission smoothness, a bearing is provided at the connection between the rotating shaft 14 and the mounting bracket 1. The outer ring of the bearing is interference-fitted with the mounting bracket 1, and the inner ring of the bearing is interference-fitted with the rotating shaft 14. The bearing converts the sliding friction between the rotating shaft 14 and the mounting bracket 1 into rolling friction, significantly reducing rotational resistance and ensuring the smooth transmission between the rotating shaft 14 and the drive sprocket 2.

[0029] In summary, the adjustable-pitch chain sprocket transmission structure provided in this embodiment has the following advantages: through the combination of lead screw 13 and handwheel 7 and threaded transmission, fine-tuning of the pitch between the driving sprocket 2 and the driven sprocket 4 can be achieved. During operation, only the handwheel 7 needs to be turned to drive the guide block 6 to slide smoothly along the guide groove 3 without disassembling the core components, which greatly improves the adjustment efficiency. At the same time, the self-locking characteristic of lead screw 13 can firmly lock the adjusted pitch and resist the displacement risk caused by equipment vibration. It can flexibly adapt to different chain lengths and different transmission ratios, and its versatility is significantly enhanced.

[0030] With the first rotating frame 11 coaxially set with the drive sprocket 2, and in conjunction with the linkage structure of the second rotating frame 12 and the guide block 6, it can synchronously and adaptively swing with the adjustment of the sprocket spacing, so that the tensioning sprocket 10 is always tightly engaged with the chain 5, continuously compensating for changes in the tension of the chain 5, effectively avoiding chain skipping, chain derailment, and abnormal transmission noise. The tooth groove of the tensioning sprocket 10 is precisely matched with the pitch of the chain 5, and the inner wall of the tooth groove is provided with a wear-resistant coating, further improving the meshing stability and wear resistance of the components. The first rotating frame 11 and the drive sprocket 2 can be quickly separated by the locking bolt 15, releasing the linkage between the tensioning component and the guide block 6, leaving sufficient operating space for the replacement of the chain 5, simplifying the maintenance process, and ensuring that the chain 5 and the sprocket are always in the optimal meshing state during the transmission process, reducing wear and extending the service life of the transmission components.

[0031] In use, first fix the device to the equipment frame through the mounting holes of mounting block 8. Turn handwheel 7 according to transmission requirements to drive screw 13 to rotate, driving guide block 6 to slide along guide groove 3. Adjust the distance between drive sprocket 2 and driven sprocket 4 to a suitable position. At this time, first rotating frame 11 swings in conjunction with second rotating frame 12, causing tension sprocket 10 to automatically tension chain 5. If the chain needs to be replaced, remove locking bolt 15 to separate first rotating frame 11 from drive sprocket 2. After disengaging the linkage, swing first rotating frame 11 to release chain tension, then adjust the distance to remove the old chain 5, install the new chain 5, reset all components, tighten locking bolt 15 and fine-tune the distance, and it is ready for use.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A chain and sprocket drive structure with adjustable pitch, characterized in that, include: Mounting bracket (1), on which a rotating shaft (14) is rotatably connected, and a drive sprocket (2) is mounted on the rotating shaft (14). A guide groove (3) is provided on the surface of the mounting bracket (1). A guide block (6) is slidably connected in the guide groove (3). A driven sprocket (4) is rotatably connected on the guide block (6). The driven sprocket (4) and the drive sprocket (2) are connected by a chain (5). A lead screw (13) is threaded in the guide groove (3). One end of the lead screw (13) extends through the outer wall of the mounting bracket (1) to the outside. A handwheel (7) is fixedly connected to one end of the lead screw (13).

2. The adjustable-pitch chain and sprocket drive structure according to claim 1, characterized in that, The mounting bracket (1) has mounting blocks (8) symmetrically arranged on its surface, and mounting holes are provided on the mounting blocks (8).

3. The adjustable-pitch chain and sprocket drive structure according to claim 1, characterized in that, The mounting bracket (1) is rotatably connected to a first rotating bracket (11) on one side. The first rotating bracket (11) is coaxially arranged with the drive sprocket (2). The first rotating bracket (11) is rotatably connected to a second rotating bracket (12) on one side. The second rotating bracket (12) is rotatably connected to the guide block (6). The first rotating bracket (11) is rotatably connected to an adjusting block (9) on the other side. The adjusting block (9) is rotatably connected to a tensioning sprocket (10). The tensioning sprocket (10) is meshed with the chain (5).

4. The adjustable-pitch chain and sprocket drive structure according to claim 1, characterized in that, The drive sprocket (2) and the rotating shaft (14) are both provided with fixing holes (16), and locking bolts (15) are installed in the fixing holes (16).

5. The adjustable-pitch chain and sprocket drive structure according to claim 1, characterized in that, The outer peripheral wall of the handwheel (7) is provided with uniformly distributed anti-slip texture.

6. The adjustable-pitch chain and sprocket drive structure according to claim 3, characterized in that, The outer peripheral wall of the tension sprocket (10) is provided with a tooth groove that matches the pitch of the chain (5), and the inner wall of the tooth groove is provided with a wear-resistant coating.

7. The adjustable-pitch chain and sprocket drive structure according to any one of claims 1-6, characterized in that, A bearing is provided at the connection between the rotating shaft (14) and the mounting bracket (1). The outer ring of the bearing is interference-fitted with the mounting bracket (1), and the inner ring of the bearing is interference-fitted with the rotating shaft (14).

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