Triangular belt flexible automatic tensioning structure

Abstract

The utility model discloses a kind of flexible automatic tensioning structure of triangular belt, it is related to the technical field of agricultural equipment, to solve the problem of the joint impact of existing technology transmission belt tensioning device, wear fast and cannot automatically compensate the belt slack in operation. The structure includes rack, a plurality of pulley connected by transmission belt and a tensioning structure. Its core is, the tensioning structure includes a reversing valve with hydraulic sensing device independent of machine main hydraulic control system, the reversing valve controls a hydraulic cylinder specially, the hydraulic cylinder drives a tensioning pulley and drives a transmission belt, the pressure change is monitored in real time by the hydraulic sensing device on the reversing valve, not only can realize flexible, impactless joint, but also can automatically supplement oil when transmission belt slack, complete the dynamic compensation of tension, so as to significantly improve the stability and reliability of transmission system, prolong the life of transmission belt.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery equipment technology, and in particular to a flexible automatic tensioning structure for a triangular belt. Background Technology

[0002] In modern heavy machinery such as agricultural equipment, engine-driven belt drive systems are widely used to transmit power. To ensure transmission efficiency and extend the service life of the drive belt, a reliable tensioning device is crucial. The technology in this field has undergone continuous development, progressing from early purely manual screw adjustment to tensioning using mechanical springs or simple hydraulic / pneumatic devices. This has improved convenience and ensured basic tension to some extent. However, despite these advancements, when using simple hydraulic or pneumatic devices, the control method is often "on / off." The instantaneous full pressure or full stroke action causes the tensioning pulley to violently impact the drive belt, producing harsh friction noise and severe mechanical vibration. This not only seriously affects the smoothness of operation but also accelerates the aging and damage of the drive belt. Furthermore, neither mechanical springs nor simple hydraulic tensioning can provide real-time, dynamic automatic compensation for drive belt slack caused by wear, fatigue, or drastic load changes after prolonged equipment operation. This leads to decreased transmission efficiency and ultimately requires operators to stop the machine for manual inspection and readjustment, increasing the workload of the workers.

[0003] Therefore, this application provides a flexible automatic tensioning structure for V-belts to meet the requirements. Utility Model Content

[0004] The purpose of this application is to provide a flexible automatic tensioning structure for V-belts, which aims to solve the technical problem that in the prior art, the transmission belt tensioning device generates huge impact, harsh friction noise and mechanical jumping due to instantaneous force during engagement, resulting in rapid wear of the transmission belt, and cannot automatically compensate for belt slack caused by wear or load changes during operation.

[0005] To achieve the above objectives, this application provides the following technical solution: a flexible automatic tensioning structure for a V-belt, comprising a frame and a main hydraulic control system. A main clutch pulley, a main clutch intermediate transmission pulley, a roller input pulley, and a fan pulley are rotatably mounted on the frame, all connected by transmission belts. The frame also includes a tensioning structure. The tensioning structure further comprises a hydraulic oil tank, a reversing valve, a hydraulic cylinder, and a rotating arm. The hydraulic oil tank is connected to the main hydraulic control system via oil pipes. The hydraulic oil tank is connected to the reversing valve via the main oil pipe, and the reversing valve is equipped with a hydraulic sensing device for sensing pressure changes. The reversing valve is connected to the hydraulic cylinder via the output oil pipe. One end of the rotating arm is hinged to the frame, and the other end of the rotating arm is connected to a tensioning wheel, which is also connected to the hydraulic cylinder. The hydraulic cylinder is connected to the frame, and the tensioning wheel is located between the main clutch pulley and the main clutch intermediate transmission pulley. By setting an independent reversing valve with a pressure sensing device, flexible engagement and dynamic automatic compensation of the transmission belt tension are achieved, effectively solving the problems of impact, noise and inability to automatically adjust in the prior art.

[0006] Preferably, the transmission belt includes a main transmission belt, an intermediate transmission belt, and a fan speed-increasing transmission belt.

[0007] Preferably, the main clutch pulley is connected to the main clutch intermediate drive pulley via the main drive belt; the main clutch intermediate drive pulley is connected to the roller input pulley via the intermediate drive belt; and the roller input pulley is connected to the fan pulley via the fan speed-increasing drive belt, ensuring the clarity, accuracy, and stability of the entire power transmission path.

[0008] Preferably, the tensioning pulley is located below the main drive belt and is used to tension the main drive belt. By placing the tensioning pulley below the main drive belt, the most direct and effective tension force can be applied to the most critical transmission link, ensuring the reliable transmission of core power.

[0009] Preferably, it also includes a controller that sends an electrical control signal to the directional valve to control the movement of the hydraulic cylinder. By adding a controller, precise control of the tensioning action is achieved.

[0010] Preferably, the fixed end of the hydraulic cylinder is hinged to the frame.

[0011] In summary, the technical effects and advantages of this utility model are as follows: In this invention, a dedicated directional valve controls the smooth extension of the hydraulic cylinder in a preset, gentle manner, achieving flexible engagement. This method greatly improves the smoothness and comfort of operation, fundamentally avoids damage to the transmission belt caused by impact, and effectively eliminates harsh friction noise and mechanical vibration.

[0012] In this invention, a hydraulic sensing device installed on the reversing valve can monitor the hydraulic changes reflecting the tension of the transmission belt in real time, and automatically perform micro-oil replenishment accordingly, achieving fully automatic dynamic compensation of the transmission belt tension. This function ensures that the transmission belt always operates under optimal tension, not only avoiding power loss caused by slippage, but also significantly extending its service life.

[0013] In this invention, a dedicated directional valve, independent of the main hydraulic control system, is used to achieve specialized control of the tensioning function. This independent control loop has clearer logic, faster response, and is unaffected by other hydraulic actions of the machine, thus ensuring the overall stability and reliability of the automatic tensioning function. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the rear view structure of this utility model; Figure 3 This is a schematic diagram of the hydraulic control principle of this utility model; Figure 4 This is an enlarged structural diagram of point A of this utility model.

[0016] In the diagram: 1. Frame; 2. Main drive belt; 3. Intermediate drive belt; 4. Fan speed-up drive belt; 5. Main clutch pulley; 6. Main clutch intermediate drive pulley; 7. Drum input pulley; 8. Fan pulley; 9. Hydraulic oil tank; 10. Main oil pipe; 11. Reversing valve; 12. Output oil pipe; 13. Swing arm; 14. Hydraulic cylinder; 15. Tensioner; 16. Main hydraulic control system; 18. Controller. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] refer to Figure 1-4 The V-belt flexible automatic tensioning structure shown includes a dedicated directional valve 11 with a hydraulic sensing device, independent of the machine's main hydraulic control system 16, to precisely control the action of the tensioning cylinder 14. This achieves flexibility in the transmission belt engagement process and full automation of tension compensation during operation. The structure significantly improves the smoothness, reliability, and service life of the transmission system, achieving true maintenance-free operation.

[0019] In one embodiment of this invention, the mechanical structure of this utility model is mounted on a frame 1. In typical agricultural machinery, the entire transmission system is powered by an engine (not shown). This power is first transmitted to the main clutch pulley 5. Multiple pulleys for further power transmission are also rotatably mounted on the frame 1, including the main clutch intermediate transmission pulley 6, the drum input pulley 7, and the fan pulley 8. These pulleys are connected by multiple transmission belts, forming a complex power transmission system for the agricultural machinery. Specifically, the transmission belts include a main transmission belt 2, an intermediate transmission belt 3, and a fan speed-increasing transmission belt 4. The main clutch pulley 5 is connected to the main clutch intermediate transmission pulley 6 via the main transmission belt 2; the main clutch intermediate transmission pulley 6 is connected to the drum input pulley 7 via the intermediate transmission belt 3; and the fan speed-increasing transmission belt 4 drives the fan pulley 8.

[0020] As one embodiment of this invention, the core actuator of the tensioning structure includes a rotating arm 13, a hydraulic cylinder 14, and a tensioning wheel 15. One end of the rotating arm 13 is rotatably hinged to the frame 1 via a fulcrum, and the other end is connected to the freely rotatable tensioning wheel 15. The fixed end of the hydraulic cylinder 14 is securely hinged to the frame 1, and its extendable end is connected to the axis of the tensioning wheel 15. With this design, when the extendable end of the hydraulic cylinder 14 extends, it can directly drive the tensioning wheel 15 and the connected rotating arm 13 to generate a preset swing trajectory, thereby applying or releasing tension to the transmission belt. The tensioning wheel 15 is located below the main transmission belt 2 and is specifically used to tension the critical main transmission belt 2.

[0021] As one implementation method in this embodiment, the power and control core includes a hydraulic oil tank 9 and a dedicated directional valve 11. The hydraulic oil tank 9 serves as the power source for the entire hydraulic system and is connected to the directional valve 11 via the main oil pipe 10, providing it with a continuous supply of hydraulic oil. The directional valve 11 is independent of the original main hydraulic control system 16 on the agricultural machinery in the hydraulic circuit. The main hydraulic control system 16 also obtains power from the hydraulic oil tank 9, but its function is to control other actuators on the machine that are not described in this invention. This "independent setting" design allows the directional valve 11 to focus on and precisely perform the specific task of tensioning the transmission belt without being disturbed by other hydraulic circuits.

[0022] As one implementation method in this embodiment, in order to achieve the function of "automatic" tensioning, a hydraulic sensing device is integrated or connected to the reversing valve 11. The hydraulic sensing device can monitor the pressure in the output oil pipe 12 connected to the reversing valve 11 in real time. Since the output oil pipe 12 is directly connected to the hydraulic cylinder 14, the pressure inside it can accurately reflect the real-time tension of the transmission belt.

[0023] As one embodiment of this invention, the present invention also includes a controller 18 installed in the cab or control center of the agricultural machinery equipment. The controller 18 is connected to the reversing valve 11 via an electrical signal line. The operator can issue "engage" or "disengage" commands through the controller 18. These commands are sent to the reversing valve 11 in the form of electrical signals, thereby starting or stopping the tensioning action.

[0024] The working principle of this practical system is as follows: When the drive belt needs to be tensioned, the operator issues an "engage" command through the controller 18. The controller 18 sends an electrical signal to the reversing valve 11. After receiving the signal, the reversing valve 11 does not open fully instantly, but instead supplies oil to the output oil pipe 12 in a preset, gentle manner, driving the hydraulic cylinder 14 to extend smoothly. This, in turn, drives the tensioning wheel 15 to slowly and forcefully press the main drive belt 2, achieving a flexible engagement. Compared with the huge friction noise and mechanical vibration generated by instantaneous engagement in existing technologies, this solution greatly improves the smoothness and comfort of operation and fundamentally avoids damage to the drive belt 2 caused by impact. During normal operation of the equipment, if the main drive belt 2 becomes loose due to wear or load changes, it will cause the hydraulic cylinder... When the pressure inside 14 drops, this pressure change is immediately transmitted to the hydraulic sensing device on the reversing valve 11 through the output oil pipe 12. After the hydraulic sensing device senses that the pressure is lower than the preset threshold, it will trigger the reversing valve 11 to automatically replenish a small amount of oil, so that the extension of the hydraulic cylinder 14 is compensated until the tension of the transmission belt is restored to the optimal state, thus completing a dynamic automatic compensation. This fully automatic compensation process ensures that the transmission belt 2 always works under the optimal tension, which not only avoids the power loss caused by slippage, but also significantly extends its service life, saving the tedious steps of manual shutdown inspection and adjustment. When separation is required, the controller 18 sends a separation signal, the reversing valve 11 switches the oil circuit, the hydraulic cylinder 14 retracts, and the tension wheel 15 separates from the transmission belt.

[0025] The electromechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments; they are common knowledge.

[0026] Components not described in detail in this article are existing technologies.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flexible automatic tensioning structure for a V-belt, comprising a frame (1) and a main hydraulic control system (16), wherein a main clutch pulley (5), a main clutch intermediate transmission pulley (6), a roller input pulley (7), and a fan pulley (8) are rotatably mounted on the frame (1), all connected by transmission belts; the frame (1) is also provided with a tensioning structure, characterized in that, The tensioning structure also includes a hydraulic oil tank (9), a reversing valve (11), a hydraulic cylinder (14), and a rotating arm (13). The hydraulic oil tank (9) is connected to the main hydraulic control system (16) through an oil pipe. The hydraulic oil tank (9) is connected to the reversing valve (11) through the main oil pipe (10), and the reversing valve (11) is provided with a hydraulic sensing device for sensing pressure changes. The reversing valve (11) is connected to the hydraulic cylinder (14) through the output oil pipe (12). One end of the rotating arm (13) is hinged to the frame (1), and the other end of the rotating arm (13) is connected to a tension wheel (15). The tension wheel (15) is also connected to the hydraulic cylinder (14), which is connected to the frame (1). The tension wheel (15) is located between the main clutch pulley (5) and the main clutch intermediate transmission wheel (6).

2. The flexible automatic tensioning structure for a V-belt according to claim 1, characterized in that: The transmission belts include a main transmission belt (2), an intermediate transmission belt (3), and a fan speed-increasing transmission belt (4).

3. The flexible automatic tensioning structure for a V-belt according to claim 2, characterized in that: The main clutch pulley (5) is connected to the main clutch intermediate drive pulley (6) via the main drive belt (2); the main clutch intermediate drive pulley (6) is connected to the roller input pulley (7) via the intermediate drive belt (3); the roller input pulley (7) is connected to the fan pulley (8) via the fan speed-increasing drive belt (4).

4. The flexible automatic tensioning structure for a V-belt according to claim 3, characterized in that: The tensioning wheel (15) is located below the main drive belt (2) and is used to tension the main drive belt (2).

5. The flexible automatic tensioning structure for a V-belt according to claim 1, characterized in that: It also includes a controller (18) that sends an electrical control signal to the directional valve (11) to control the movement of the hydraulic cylinder (14).

6. The flexible automatic tensioning structure for a V-belt according to claim 1, characterized in that: The fixed end of the hydraulic cylinder (14) is hinged to the frame (1).

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