Triangular belt transmission device capable of automatically tensioning
By introducing an automatic tensioning mechanism with elastic and length adjustment components into the V-belt drive, the problems of long adjustment time and high maintenance frequency of traditional V-belt drives are solved, achieving constant belt tension, reducing energy consumption and maintenance costs, and improving safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING CHINA TOBACCO IND CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional V-belt drive systems in cigarette factory cooling towers require time-consuming belt adjustments, have high maintenance frequency, and pose safety hazards and operational losses.
An automatic tensioning mechanism consisting of elastic and length adjustment components is used to adjust belt tension by extending and retracting the elastic adjustment component, thereby achieving automatic tensioning and reducing the time and frequency of manual adjustment.
It reduces belt adjustment time and maintenance frequency, extends belt life, saves energy and costs, and eliminates safety hazards.
Smart Images
Figure CN224260843U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of transmission equipment technology, specifically relating to a V-belt transmission device that can automatically tension. Background Technology
[0002] Large cooling towers in cigarette factories are key auxiliary equipment in their production process, mainly used for waste heat recovery and circulating water cooling to ensure the stable operation of core processes such as tobacco processing, cigarette making, and packaging. Because cigarette production involves high-temperature drying (such as tobacco drying and leaf moistening) and steam heating, a large amount of heat is generated. This heat must be cooled in cooling towers and reused to maintain equipment temperature balance.
[0003] In large cooling towers in cigarette factories, the V-belt drive system is the core mechanical component connecting the motor and the fan. Its main function is to efficiently and stably transmit the high-speed rotational power of the motor to the fan, driving the fan impeller to rotate, thereby promoting heat exchange between the air and circulating water and ensuring the cooling tower's heat dissipation function. Currently, traditional V-belt drive systems generally suffer from the following problems: High reliance on manual operation: Complete shutdown is required for operation, with each adjustment taking more than 15 minutes. Precision deficiencies: Reliance on visually assessing belt tension, easily resulting in excessive tightness (accelerated wear) or excessive looseness (slippage rate as high as 8%), shortening the average belt life. Safety hazards: Adjustment in high-temperature summer environments can easily lead to heatstroke for personnel and poses a risk of mechanical injury. Operational losses: Belt loosening or detachment, or shutdown during adjustment, can cause the cooling water temperature to rise, triggering equipment overheat protection and affecting production continuity. High maintenance costs: A single cooling tower consumes a large number of belts annually, resulting in high maintenance costs. Utility Model Content
[0004] The purpose of this invention is to provide an automatically tensioning V-belt drive device to solve the problems of long adjustment time and high maintenance frequency in existing V-belt drive devices.
[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:
[0006] An automatically tensioned V-belt drive device includes a frame, a motor, a large pulley, and a small pulley. The small pulley is fixedly mounted on the output shaft of the motor. A belt is installed between the small pulley and the large pulley. The large pulley is rotatably mounted on the frame. The frame is provided with a motor support guide rail and an adjusting rod. A motor mounting bracket is linearly movable on the motor support guide rail. The motor is fixedly mounted on the motor mounting bracket. An elastic adjusting element is provided between the motor mounting bracket and the adjusting rod. The elastic adjusting element is elastic and its natural length can be adjusted.
[0007] Furthermore, the elastic adjusting component includes an elastic element and a length adjusting component. The elastic element is fixedly connected to the length adjusting component, and the end of the elastic element away from the length adjusting component is fixedly connected to the motor mounting bracket. The end of the length adjusting component away from the elastic element is fixedly connected to the adjusting fixing rod. In this technical solution, the elastic element can automatically extend and retract, maintaining constant belt tension during belt operation; the length adjusting component can adjust the natural length of the entire elastic adjusting component, facilitating adjustment of the natural length of the elastic adjusting component during belt installation or removal.
[0008] Furthermore, the elastic element is a tension spring, and both ends of the tension spring are provided with tension hooks. The tension spring has strong tensile force and high strength.
[0009] Furthermore, the length adjusting component includes a strip-shaped hollow block with threaded holes at both ends. Each threaded hole contains a length adjusting hook, one of which is connected to a tension spring hook. By rotating the strip-shaped hollow block, the two length adjusting hooks move further apart or closer together. In this technical solution, rotating the strip-shaped hollow block allows the two length adjusting hooks to move further apart or closer together, thereby achieving the purpose of adjusting the length of the entire length adjusting component.
[0010] Furthermore, the frame includes two parallel mounting rails, each with a motor bracket guide rail. Each motor bracket guide rail has a slide rail, and pulleys are located on both the upper and lower sides of the slide rail. A connecting plate is mounted on the motor mounting bracket, and a rotating shaft screw is rotatably mounted on each pulley, with the rotating shaft screw fixedly mounted on the connecting plate. In this technical solution, the motor mounting bracket is connected to the pulleys via the connecting plate and the rotating shaft screw, and the pulleys are slidably mounted on the slide rails of the motor bracket guide rails. This allows the motor mounting bracket to move linearly on the motor bracket guide rails, and this arrangement also ensures smoother sliding.
[0011] Furthermore, a large pulley mounting bracket is provided between the two mounting rails, and the large pulley is rotatably mounted on the large pulley mounting bracket. The large pulley mounting bracket in this design is used for the stable mounting of the large pulley.
[0012] Furthermore, the motor mounting bracket has an ear plate on the side away from the large pulley, and the ear plate has a first connecting hole; a connecting rod is fixedly connected between the two mounting rails, and the adjusting rod is fixedly installed on the connecting rod, which has a second connecting hole; the two ends of the elastic adjusting member are respectively hooked onto the first connecting hole and the second connecting hole. This design allows the elastic adjusting member to be stably installed and easily adjusted.
[0013] The utility model adopting the above technical solution has the following advantages:
[0014] This invention mounts a motor on a motor mounting bracket, which can move linearly along a motor support guide rail. An elastic adjusting element is positioned between the motor mounting bracket and the adjusting rod. This elastic adjusting element is flexible and its natural length is adjustable. Thus, during initial installation or belt replacement, increasing the natural length of the elastic adjusting element unloads it, making belt installation easier. Subsequently, shortening the natural length of the elastic adjusting element ensures the belt is fully engaged and tensioned with the large and small pulleys, guaranteeing transmission efficiency. During operation, if the belt stretches due to aging, the elastic adjusting element automatically retracts, causing the motor mounting bracket to move away from the large pulley on the motor support guide rail, ensuring constant belt tension. This design reduces the time spent adjusting the belt and lowers maintenance frequency. Attached Figure Description
[0015] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;
[0016] Figure 1 This is a schematic diagram of an automatically tensioned V-belt drive device according to the present invention;
[0017] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;
[0018] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle;
[0019] Figure 4 for Figure 1 Schematic diagram of the structure of the middle frame, large pulley mounting bracket, and motor bracket guide rail;
[0020] Figure 5 for Figure 1 A schematic diagram of the structure of the motor mounting bracket.
[0021] The symbols for the main components are explained below:
[0022] 1. Motor; 2. Large pulley; 3. Small pulley; 4. Belt; 5. Large pulley mounting bracket; 6. Mounting rail; 7. Motor bracket guide rail; 8. Adjusting and fixing rod; 9. Motor mounting bracket; 10. Tension spring; 11. Tension spring hook; 12. Strip hollow block; 13. Length adjusting hook; 14. Slide rail; 15. Pulley; 16. Connecting plate; 17. Rotating shaft screw; 18. Ear plate; 19. First connecting hole; 20. Connecting rod; 21. Second connecting hole. Detailed Implementation
[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. Furthermore, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.
[0024] This embodiment provides an automatically tensionable V-belt drive device, such as... Figures 1-5 As shown, the system includes a frame, a motor 1, a large pulley 2, and a small pulley 3. The small pulley 3 is fixedly mounted on the output shaft of the motor 1 via a flat key. A belt 4 is installed between the small pulley 3 and the large pulley 2. The large pulley 2 is rotatably mounted on a large pulley mounting bracket 5 on the frame. The frame includes two parallel mounting rails 6, each with a large pulley mounting bracket 5. An adjusting rod 8 is also provided on the frame. A motor mounting bracket 9 is linearly movable on the large pulley mounting bracket 5. The motor 1 is fixedly mounted on the motor mounting bracket 9 via bolts. An elastic adjusting element is provided between the motor mounting bracket 9 and the adjusting rod 8. The elastic adjusting element is elastic and adjustable in length. Specifically, the elastic adjusting element includes an elastic element and a length adjusting element. The elastic element and the length adjusting element are fixedly connected. The end of the elastic element away from the length adjusting element is fixedly connected to the motor mounting bracket 9, and the end of the length adjusting element away from the elastic element is fixedly connected to the adjusting rod 8. The elastic element can be a tension spring 10 or a rubber band. In this embodiment, a tension spring 10 is selected. The tension spring 10 is an SWC-8-60 type tension spring, which has a constant force output of 60 kgf. Both ends of the tension spring 10 are provided with tension spring hooks 11. The length adjustment element includes a strip-shaped hollow block 12. Both ends of the strip-shaped hollow block 12 are provided with threaded holes. Length adjustment hooks 13 are threaded into the threaded holes at both ends. One of the length adjustment hooks 13 is hooked with the tension spring hook 11. By rotating the strip-shaped hollow block 12, the two length adjustment hooks 13 move away from or closer to each other.
[0025] The large pulley mounting bracket 5 is equipped with a slide rail 14, which is made of 2×Ø31.6mm 316 stainless steel round bars. Pulleys 15 are installed on both the upper and lower sides of the slide rail 14, as shown in the figure, for a total of 8 pulleys 15, i.e., four sets of stainless steel clamp-type pulleys 15. A connecting plate 16 is provided at the end of the motor mounting bracket 9. Rotating shaft screws 17 are mounted on the pulleys 15 and are fixedly installed on the connecting plate 16 by nuts.
[0026] A lug plate 18 is welded to the side of the motor mounting bracket 9 away from the large pulley 2, and a first connecting hole 19 is provided on the lug plate 18; a connecting rod 20 is welded between the two mounting rails 6, and an adjusting fixing rod 8 is vertically welded to the connecting rod 20, and a second connecting hole 21 is provided on the adjusting fixing rod 8; a tension spring hook 11 and a length adjusting hook 13 are respectively hooked onto the first connecting hole 19 and the second connecting hole 21.
[0027] The working principle of the automatically tensioned V-belt drive device in this embodiment is as follows:
[0028] In this invention, the motor 1 is mounted on the motor mounting bracket 9. The motor mounting bracket 9 is slidably mounted on the slide rail 14 of the large pulley mounting bracket 5 via pulley 15. Then, an elastic adjusting member consisting of a tension spring 10 and a length adjusting member is provided between the motor mounting bracket 9 and the adjusting fixing rod 8. The tension spring 10 is elastic, while the length adjusting member can adjust the natural length.
[0029] During initial installation or replacement of belt 4, the two length adjustment hooks 13 at both ends of the hollow strip block 12 are moved away by rotating the hollow strip block 12, and the length of the length adjustment component increases, thereby unloading the elastic adjustment component and making it easy to install belt 4. Then, by rotating the hollow strip block 12 in the opposite direction, the two length adjustment hooks 13 at both ends of the hollow strip block 12 are moved closer, and the length of the length adjustment component decreases, thereby stretching the tension spring 10, so that belt 4 can fully cooperate with the large pulley 2 and the small pulley 3 to ensure transmission efficiency.
[0030] During operation, if belt 4 stretches due to aging, tension spring 10 is elastic and can automatically retract. Motor mounting bracket 9 moves away from large pulley 2 on large pulley mounting bracket 5 to ensure constant tension of belt 4.
[0031] The solution in this embodiment can reduce the time spent adjusting the belt, decrease the maintenance frequency, and extend the belt's lifespan, as detailed below:
[0032]
[0033] Through this embodiment, energy saving can also be achieved: 182.5 kWh of electricity saved per unit per year (contributed by reduced slippage rate); reduced maintenance costs: 1920 yuan saved per unit per year on belt consumption (120 yuan per belt × 16 belts); elimination of downtime losses: avoiding an average of 1.5 times per unit per year of downtime due to malfunction (2.5 hours per time); safety benefits: eliminating manual adjustment operations in high-temperature environments and eliminating the risk of mechanical injury.
[0034] The above provides a detailed description of an automatically tensionable V-belt drive device provided by this utility model. The specific embodiments are described only to aid in understanding the method and core concept of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. An automatically tensionable V-belt drive device, comprising a frame, a motor, a large pulley, and a small pulley, wherein the small pulley is fixedly mounted on the output shaft of the motor, a belt is installed between the small pulley and the large pulley, and the large pulley is rotatably mounted on the frame; characterized in that: The frame is provided with a motor support guide rail and an adjusting rod. A motor mounting bracket is provided on the motor support guide rail that can move linearly. The motor is fixedly mounted on the motor mounting bracket. An elastic adjusting member is provided between the motor mounting bracket and the adjusting rod. The elastic adjusting member is elastic and can adjust its natural length.
2. The automatically tensionable V-belt drive device according to claim 1, characterized in that: The elastic adjustment component includes an elastic element and a length adjustment component. The elastic element is fixedly connected to the length adjustment component. The end of the elastic element away from the length adjustment component is fixedly connected to the motor mounting bracket. The end of the length adjustment component away from the elastic element is fixedly connected to the adjustment fixing rod.
3. The automatically tensionable V-belt drive device according to claim 2, characterized in that: The elastic element is a tension spring, and tension spring hooks are provided at both ends of the tension spring.
4. The automatically tensionable V-belt drive device according to claim 3, characterized in that: The length adjusting component includes a strip-shaped hollow block with threaded holes at both ends. Each threaded hole at both ends is threaded with a length adjusting hook. One of the length adjusting hooks is connected to a tension spring hook. By rotating the strip-shaped hollow block, the two length adjusting hooks move away from or closer to each other.
5. A V-belt drive device with automatic tensioning according to any one of claims 1-3, characterized in that: The frame includes two parallel mounting rails, each with a motor bracket guide rail. The motor bracket guide rail has a slide rail, and pulleys are provided on both the upper and lower sides of the slide rail. A connecting plate is provided on the motor mounting bracket, and a rotating shaft screw is rotatably mounted on the pulley. The rotating shaft screw is fixedly mounted on the connecting plate.
6. The automatically tensionable V-belt drive device according to claim 5, characterized in that: A large pulley mounting bracket is provided between the two mounting rails, and the large pulley is rotatably mounted on the large pulley mounting bracket.
7. The automatically tensionable V-belt drive device according to claim 5, characterized in that: The motor mounting bracket has an ear plate on the side away from the large pulley, and the ear plate has a first connecting hole; a connecting rod is fixedly connected between the two mounting rails, and the adjusting rod is fixedly installed on the connecting rod, and the adjusting rod has a second connecting hole; the two ends of the elastic adjusting member are respectively hooked onto the first connecting hole and the second connecting hole.