An adjustable automatic tensioning mechanism for a sanding belt
By designing an adjustable sanding belt automatic tensioning mechanism, the problem of length adjustment in ultra-precision machining equipment for chamfering the end faces of cylindrical parts was solved, enabling simultaneous ultra-precision machining of the chamfers on both end faces of long workpieces, thus improving the applicability and automation level of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- THIEL ENHAUS MASCH (SHANGHAI) CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-06-05
AI Technical Summary
Existing ultra-precision machining equipment for chamfering the end faces of cylindrical parts has difficulty adjusting the length of the ultra-precision machining area, making it difficult to perform ultra-precision machining on both ends of long cylindrical parts simultaneously.
An automatic tensioning mechanism for adjustable abrasive belts was designed. Through a drive mechanism and a tensioning mechanism, the automatic adjustment and tensioning of the abrasive belt are realized, ensuring that the length and tension of the abrasive belt remain stable when the length of the workpiece changes.
It enables simultaneous ultra-precision machining of the chamfers on both ends of long workpieces. The adjustment is simple, the application range is wide, and no additional tension adjustment is required, which improves the practicality of the device.
Smart Images
Figure CN224322890U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ultra-precision machining equipment technology, and in particular to an automatic tensioning mechanism for an adjustable abrasive belt. Background Technology
[0002] Ultra-precision machining is a high-precision machining technique whose main purpose is to reduce the surface roughness of a workpiece through micro-cutting, thereby improving the surface quality and shape accuracy of the workpiece. This technique is usually performed after the fine grinding process, with a machining allowance of only a few micrometers. It is suitable for machining the outer and inner circles, planes, grooves, and spherical surfaces of crankshafts, rolls, bearing rings, and various precision parts.
[0003] The purpose of chamfering and ultra-precision machining of cylindrical parts is to improve the surface quality and assembly performance of the parts. Chamfering and ultra-precision machining of cylindrical parts can only be performed using flexible abrasive belts that can conform to the end face of the workpiece.
[0004] In the prior art, the ultra-precision machining equipment for chamfering the end face of cylindrical parts has a fixed length of ultra-precision machining area, which is not easy to adjust. Therefore, it is difficult to perform ultra-precision machining on both ends of long cylindrical parts at the same time. Therefore, there is an urgent need for an automatic tensioning mechanism for adjustable abrasive belts to solve the above-mentioned technical problems. Utility Model Content
[0005] This utility model discloses an automatic tensioning mechanism for an adjustable sanding belt. It includes a drive mechanism that allows the workpiece to be placed below driven wheels three and four during operation, with the chamfered ends of the workpiece contacting the ultra-precision area at the bottom of the sanding belt. The drive motor is then activated, rotating the drive wheel, which in turn, along with driven wheels one, two, three, and four, causes the sanding belt to rotate in a cycle. During this rotation, the chamfered ends of the workpiece are ultra-precision machined. When the workpiece is long, the drive mechanism can move the adjustment bracket to adjust the distance between driven wheels three and four, thereby adjusting the length of the ultra-precision sanding belt without changing the belt tension. Therefore, no additional tension adjustment is needed. This allows the device to simultaneously perform ultra-precision machining on the chamfered ends of long workpieces, simplifying the adjustment process and broadening its applicability.
[0006] By incorporating a tensioning mechanism, during operation, the driven wheel four is rotatably mounted at the bottom of the mounting frame, which is rotatably mounted on the front of the mounting plate via a rotating shaft. The second fixing block is fixed, and the second fixing block is elastically connected to the mounting frame via a tension spring. Therefore, the tension spring can push the mounting frame, causing it to rotate around the rotating shaft, which in turn causes the driven wheel four to rotate around the shaft, stretching the sanding belt and achieving automatic tensioning. Relying on the elasticity of the tension spring, the tension can be maintained at all times and adapts to the deformation of the sanding belt. Therefore, after initial calibration, the tensioning function can be automatically achieved. Even when adjusting the length of the ultra-precision sanding belt, there is no need for secondary adjustment of the sanding belt tension, achieving an automatic tensioning effect. In summary, the problems in the background technology are solved.
[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0008] This utility model discloses an automatic tensioning mechanism for an adjustable sanding belt, comprising a mounting base and a drive motor. The mounting base has a mounting plate on one side, and the drive motor is fixedly mounted on the back side of the mounting plate. A through slot is provided on the mounting plate, and the output end of the drive motor passes through the through slot. A drive wheel is fixedly connected to the output end of the drive motor.
[0009] Two driven wheels are rotatably mounted on one side of the front of the mounting plate. A sliding groove is opened laterally on the front of the mounting base. An adjusting bracket is slidably mounted on the sliding groove through a sliding connector. The adjusting bracket is "Z" shaped. Driven wheels two and three are rotatably mounted on the top and bottom of the adjusting bracket, respectively. A rotating shaft is rotatably mounted on the mounting plate. A mounting frame is fixedly connected to the outside of the rotating shaft. A first connecting groove is opened on one side of the mounting frame. A driven wheel four is rotatably mounted on the bottom of the mounting frame. The driving wheel, driven wheels one, two, three, and four are connected by a grinding belt. The outer surface of the grinding belt is covered with abrasive.
[0010] A drive mechanism, comprising a first fixed block, an electric push rod, and a transmission block;
[0011] The tensioning mechanism includes a second fixed block and a tensioning spring.
[0012] Furthermore, the first fixing block is fixedly installed on the front of the mounting plate, and an electric push rod is fixedly installed through the first fixing block. The output end of the electric push rod is fixedly connected to a transmission block, and the bottom of the transmission block is fixedly connected to the top of the adjusting bracket.
[0013] Furthermore, the second fixing block is fixedly installed on the front of the mounting plate, and a second connecting groove is provided on one side of the second fixing block. A tension spring is fixedly connected deep inside the second connecting groove, and the other end of the tension spring is fixedly connected to the deep inside of the first connecting groove.
[0014] Furthermore, both the mounting base and the drive motor are fixedly connected to the frame of the external equipment, and the diameter of the tension spring is smaller than the diameter of the first connecting groove and the second connecting groove.
[0015] Furthermore, the circumferential surfaces of the driving wheel, driven wheel one, driven wheel two, driven wheel three, and driven wheel four are all designed with an inward concave shape.
[0016] Furthermore, the abrasive belt is S-shaped and wraps around the outer circumference of driven wheel one, driven wheel two, driven wheel three, and driven wheel four.
[0017] The present invention has the following advantages over the prior art:
[0018] 1. This technical solution incorporates a drive mechanism that allows the workpiece to be positioned below driven wheels three and four during operation, with the chamfered ends of the workpiece contacting the ultra-precision area at the bottom of the grinding belt. The drive motor is then activated, rotating the drive wheel, which in turn, along with driven wheels one, two, three, and four, causes the grinding belt to rotate in a cycle. This rotation of the grinding belt performs ultra-precision machining on the chamfered ends of the workpiece. When the workpiece is long, the drive mechanism can move the adjusting bracket to adjust the distance between driven wheels three and four, thereby adjusting the length of the ultra-precision grinding belt without altering the belt tension. Therefore, no additional tension adjustment is required. This allows the device to simultaneously perform ultra-precision machining on the chamfered ends of long workpieces, simplifying the adjustment process, broadening its applicability, and increasing its practicality.
[0019] 2. This technical solution incorporates a tensioning mechanism. During operation, the driven wheel four is rotatably mounted at the bottom of the mounting frame, which is rotatably mounted on the front of the mounting plate via a rotating shaft. The second fixing block is fixed, and the second fixing block is elastically connected to the mounting frame via a tension spring. Therefore, the tension spring can push the mounting frame, causing it to rotate around the rotating shaft. This, in turn, causes the driven wheel four to rotate around the shaft, stretching the sanding belt and achieving automatic tensioning. Relying on the elasticity of the tension spring, the tension can be maintained at all times and adapts to the deformation of the sanding belt. Therefore, after initial calibration, the tensioning function can be automatically achieved. Even when adjusting the length of the ultra-precision sanding belt, there is no need for secondary adjustment of the sanding belt tension, achieving an automatic tensioning effect and further improving its practicality. Attached Figure Description
[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;
[0022] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;
[0023] Figure 3 This is a schematic diagram of the driven wheel three-mounting structure of this utility model;
[0024] Figure 4 An exploded view of the mounting bracket of this utility model;
[0025] Figure 5 This is a schematic diagram of the explosive structure of the tension spring installation according to this utility model.
[0026] In the diagram: 1. Mounting base; 2. Drive motor; 3. Mounting plate; 4. Through groove; 5. Drive wheel; 6. Driven wheel one; 7. Slide groove; 8. Sliding connector; 9. Adjusting bracket; 10. Driven wheel two; 11. Driven wheel three; 12. Rotating shaft; 13. Mounting bracket; 14. First connecting groove; 15. Driven wheel four; 16. Grinding belt; 17. First fixing block; 18. Electric actuator; 19. Transmission block; 20. Second fixing block; 21. Tension spring; 22. Second connecting groove. Detailed Implementation
[0027] 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 skilled in the art without creative effort are within the protection scope of the present utility model.
[0028] In the description of this utility model, it should be understood that the terms "surface", "side", "gap", "peripheral", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0029] Reference Figures 1-5 An adjustable sanding belt automatic tensioning mechanism includes a mounting base 1 and a drive motor 2. A mounting plate 3 is provided on one side of the mounting base 1. The drive motor 2 is fixedly installed on the back side of the mounting plate 3. A through slot 4 is provided at the mounting plate 3. The output end of the drive motor 2 passes through the through slot 4. A drive wheel 5 is fixedly connected to the output end of the drive motor 2.
[0030] Two driven wheels 6 are rotatably mounted on one side of the front of the mounting plate 3. A sliding groove 7 is laterally opened on the front of the mounting base 1. An adjusting bracket 9 is slidably mounted at the sliding groove 7 through a sliding connector 8. The adjusting bracket 9 is Z-shaped. Driven wheels 10 and 11 are rotatably mounted at the top and bottom of the adjusting bracket 9, respectively. A rotating shaft 12 is rotatably mounted on the mounting plate 3. A mounting bracket 13 is fixedly connected to the outside of the rotating shaft 12. A first connecting groove 14 is opened on one side of the mounting bracket 13. A driven wheel 15 is rotatably mounted at the bottom of the mounting bracket 13. The driving wheel 5, driven wheels 6, 10, 11, and 15 are connected by a grinding belt 16. The outer surface of the grinding belt 16 is covered with abrasive. The driving mechanism includes a first fixed block 17, an electric push rod 18, and a transmission block 19. The tensioning mechanism includes a second fixed block 20 and a tension spring 21.
[0031] The first fixing block 17 is fixedly installed on the front of the mounting plate 3. An electric push rod 18 is fixedly installed through the first fixing block 17. The output end of the electric push rod 18 is fixedly connected to a transmission block 19. The bottom of the transmission block 19 is fixedly connected to the top of the adjusting bracket 9. The second fixing block 20 is fixedly installed on the front of the mounting plate 3. A second connecting groove 22 is opened on one side of the second fixing block 20. A tension spring 21 is fixedly connected deep inside the second connecting groove 22. The other end of the tension spring 21 is fixedly connected to the deep inside of the first connecting groove 14.
[0032] Mounting base 1 and drive motor 2 are both fixedly connected to the frame of external equipment. The diameter of tension spring 21 is smaller than the diameter of first connecting groove 14 and second connecting groove 22. The circumferential surfaces of drive wheel 5, driven wheel 1 6, driven wheel 2 10, driven wheel 3 11 and driven wheel 4 15 are all concave. The abrasive belt 16 is S-shaped and wraps around the outer circumference of driven wheel 1 6, driven wheel 2 10, driven wheel 3 11 and driven wheel 4 15.
[0033] In the specific implementation process, during operation, the workpiece can be placed below driven wheels 11 and 15, with the chamfered ends of the workpiece contacting the ultra-precision area at the bottom of the grinding belt 16. At this point, the drive motor 2 can be started, driving the drive wheel 5 to rotate. This, in conjunction with driven wheels 6, 10, 11, and 15, drives the grinding belt 16 to rotate in a cycle. As the grinding belt 16 rotates, ultra-precision machining is performed on the chamfered ends of the workpiece. If the workpiece is long, the electric actuator 18 can be activated to extend it. This, in conjunction with the transmission block 19 and the slide groove 7, moves the adjusting bracket 9, thereby synchronously moving driven wheels 10 and 11. By moving driven wheel 3 11 away from driven wheel 4 15, the distance between driven wheel 3 11 and driven wheel 4 15 can be adjusted. Since the abrasive belt 16 located above and below the adjusting bracket 9 always remains horizontal, when the adjusting bracket 9 moves left and right, the increase or decrease in length of the upper and lower abrasive belts 16 compensates for each other. That is, by how much the lower abrasive belt 16 is lengthened, the upper abrasive belt 16 will be shortened by the same amount, without changing the total length of the belt. Therefore, this adjusting bracket 9 can ensure that the tension of the abrasive belt 16 will not change when adjusting the length of the ultra-precision abrasive belt 16. Therefore, no additional tension adjustment function is needed, which allows the device to perform ultra-precision machining on the chamfered positions of both ends of a long workpiece simultaneously. The adjustment work is simple and has a wide range of applications.
[0034] Furthermore, during operation, the driven wheel 15 is rotatably mounted at the bottom of the mounting bracket 13, and the mounting bracket 13 is rotatably mounted on the front of the mounting plate 3 via the rotating shaft 12. The second fixing block 20 is fixedly mounted, and the second fixing block 20 and the mounting bracket 13 are elastically connected by the tension spring 21. Therefore, the mounting bracket 13 can be pushed by the tension spring 21, causing the mounting bracket 13 to rotate around the rotating shaft 12, thereby causing the driven wheel 15 to rotate around the rotating shaft 12, stretching the sanding belt 16 and achieving automatic tensioning. Relying on the elasticity of the tension spring 21, the tension can always be maintained, and it adapts to the deformation of the sanding belt 16. Therefore, after initial calibration, the tensioning function can be automatically achieved. Even when adjusting the length of the ultra-precision sanding belt 16, there is no need to adjust the tension of the sanding belt 16 again, achieving the effect of automatic tensioning and further improving its practicality.
[0035] The mounting base 1 and the drive motor 2 are fixedly connected to the frame of the external equipment to ensure the overall stability of the device. The diameter of the tension spring 21 is smaller than that of the first connecting groove 14 and the second connecting groove 22 to ensure that there is enough space for the tension spring 21 to expand and contract when the mounting frame 13 rotates.
[0036] Among them, the circumferential surfaces of the driving wheel 5, driven wheel 1 6, driven wheel 2 10, driven wheel 3 11 and driven wheel 4 15 are all designed with an inward concave shape to prevent the abrasive belt 16 from falling off.
[0037] The sanding belt 16 is S-shaped and wraps around the outer circumference of driven wheel 1 6, driven wheel 2 10, driven wheel 3 11 and driven wheel 4 15 to ensure that the sanding belt 16 has sufficient tension and facilitates the adjustment of the ultra-precision area length. At the same time, it makes the sanding belt 16 less prone to loosening.
[0038] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. An automatic tensioning mechanism for adjustable sanding belts, comprising a mounting base (1) and a drive motor (2), characterized in that: The mounting base (1) has a mounting plate (3) on one side. The drive motor (2) is fixedly mounted on the back side of the mounting plate (3). A through slot (4) is provided at the mounting plate (3). The output end of the drive motor (2) passes through the through slot (4). The output end of the drive motor (2) is fixedly connected to a drive wheel (5). Two driven wheels (6) are rotatably mounted on one side of the front of the mounting plate (3). A sliding groove (7) is provided laterally on the front of the mounting base (1). An adjusting bracket (9) is slidably mounted at the sliding groove (7) via a sliding connector (8). The adjusting bracket (9) is Z-shaped. Driven wheels (10) and (11) are rotatably mounted at the top and bottom of the adjusting bracket (9), respectively. A rotating shaft (12) is rotatably mounted on the mounting plate (3). The rotating shaft (12) is fixedly connected to the outside of the mounting bracket (13). A first connecting groove (14) is provided on one side of the mounting bracket (13). A driven wheel four (15) is rotatably installed at the bottom of the mounting bracket (13). The driving wheel (5), driven wheel one (6), driven wheel two (10), driven wheel three (11) and driven wheel four (15) are connected by a grinding belt (16). The outer surface of the grinding belt (16) is provided with abrasive. The drive mechanism includes a first fixed block (17), an electric push rod (18), and a transmission block (19); The tensioning mechanism includes a second fixed block (20) and a tensioning spring (21).
2. The automatic tensioning mechanism for an adjustable sanding belt according to claim 1, characterized in that: The first fixing block (17) is fixedly installed on the front of the mounting plate (3). An electric push rod (18) is fixedly installed through the first fixing block (17). A transmission block (19) is fixedly connected to the output end of the electric push rod (18). The bottom of the transmission block (19) is fixedly connected to the top of the adjusting bracket (9).
3. The automatic tensioning mechanism for an adjustable sanding belt according to claim 1, characterized in that: The second fixing block (20) is fixedly installed on the front of the mounting plate (3). A second connecting groove (22) is provided on one side of the second fixing block (20). A tension spring (21) is fixedly connected deep inside the second connecting groove (22). The other end of the tension spring (21) is fixedly connected to the deep inside of the first connecting groove (14).
4. The automatic tensioning mechanism for an adjustable sanding belt according to claim 3, characterized in that: The mounting base (1) and the drive motor (2) are both fixedly connected to the frame of the external equipment. The diameter of the tension spring (21) is smaller than the diameter of the first connecting groove (14) and the second connecting groove (22).
5. The automatic tensioning mechanism for an adjustable sanding belt according to claim 1, characterized in that: The circumferential surfaces of the driving wheel (5), driven wheel one (6), driven wheel two (10), driven wheel three (11) and driven wheel four (15) are all concave.
6. The automatic tensioning mechanism for an adjustable sanding belt according to claim 1, characterized in that: The abrasive belt (16) is S-shaped and wraps around the outer circumference of driven wheel one (6), driven wheel two (10), driven wheel three (11) and driven wheel four (15).