A protective structure of a belt tensioning mechanism of a combine harvester

Abstract

The utility model belongs to the technical field of combine harvester, concretely relates to a protection structure of combined harvester belt tensioning mechanism, including the suspension beam, the bottom of suspension beam is installed with the hydraulic cylinder, the bottom of suspension beam and located both sides of hydraulic cylinder are all fixed with the mounting panel, the stroke rod of hydraulic cylinder is horizontally arranged and is rotationally connected with first swing arm, first swing arm is rotationally connected with mounting panel, one end of first swing arm away from hydraulic cylinder is rotationally connected with second swing arm, and the axle rod rotationally connected with first swing arm and second swing arm is slidably connected on mounting panel, the top of first swing arm and second swing arm in suspension beam is provided with the mounting groove, one end of second swing arm away from first swing arm is rotationally connected with the pull plate, and the pull plate is rotationally connected on mounting panel. The utility model can effectively block the sundries such as field straw, gravel, avoid that the pull plate is entangled and is jammed, the tension sensor is impacted and is contaminated, and guarantee pull plate transmission stability, sensor detection accurate.

Description

Technical Field

[0001] This utility model belongs to the field of combine harvester technology, specifically relating to a protective structure for a combine harvester belt tensioning mechanism. Background Technology

[0002] As a core piece of equipment in modern agricultural production, the combine harvester's belt drive system undertakes key functions such as power transmission and driving of working components. The tension of the belt directly affects the harvester's operating efficiency and transmission reliability. To solve the problems of traditional combine harvester belt tensioning devices relying on manual pulling of handles and cables, resulting in high labor intensity and low work efficiency;

[0003] In the existing technology, there have been improved solutions such as the combine harvester belt tensioning device with publication number CN209458362U. This solution uses an electro-hydraulic actuator in conjunction with the lever structure of the rotating arm to replace manual operation and automatically lift the tensioning wheel. It also adds a tension sensor, processing module and indicator light to achieve accurate detection and automatic control of tension force, which significantly improves the automation level and convenience of tensioning operation.

[0004] However, combine harvesters are mostly used in field environments for crops such as wheat, rice, and corn. During operation, there are usually a lot of debris such as straw, weeds, soil clods, and gravel in the fields. Some of these debris can easily splash or accumulate as the harvester moves or the working parts operate. In the existing tensioning devices, the core transmission component "pull plate" and the key detection component "tension sensor" are both exposed without any specific protective structure, resulting in a serious lack of protection when the device is actually used in the field.

[0005] On the one hand, the pull plate, as a key transmission component connecting the swing arm and the tension wheel spring assembly, transmits power through a hinge structure. The exposed plate is easily entangled by straw and weeds flying in the field, or directly impacted by mud clods and gravel. Over time, debris may jam the hinge part of the pull plate, causing the pull plate to be unable to rotate smoothly with the swing arm, damaging the stability of the lever transmission, and thus causing the tension wheel lifting action to fail, resulting in insufficient or excessive belt tension, affecting the normal operation of the harvester.

[0006] On the other hand, the tension sensor, as the core component for tension detection, is installed at the connection between the tension plate and the tension wheel spring assembly. It needs to accurately sense changes in tension to provide feedback to the processing module. However, the sensor itself has a delicate structure and is easily damaged by direct impact from field debris when exposed, or by being covered and contaminated by soil or crop sap, leading to decreased sensor detection accuracy, signal distortion, or even complete failure. If the tension sensor fails, the processing module will not be able to accurately determine whether the tension has reached the preset value. This will not only cause the automatic stop function of the electro-hydraulic actuator to fail, but may also lead to a chain of failures such as belt breakage and wear of transmission components due to uncontrolled tension. Frequent shutdowns for maintenance will be required, significantly increasing maintenance costs. Moreover, during the harvest season when time is tight, downtime for maintenance will directly delay the operation progress and cause economic losses.

[0007] Therefore, there is an urgent need for a structure that can effectively protect the pull plate and tension sensor to avoid the risk of failure caused by field debris, extend the service life of the device, and ensure the stable operation of the combine harvester. Utility Model Content

[0008] The purpose of this utility model is to provide a protective structure for the belt tensioning mechanism of a combine harvester, which can effectively block debris such as straw and gravel in the field, prevent the tension plate from being entangled and stuck, prevent the tension sensor from being contaminated by impact, and ensure stable transmission of the tension plate and accurate detection of the sensor.

[0009] The specific technical solution adopted by this utility model is as follows:

[0010] A protective structure for a combine harvester belt tensioning mechanism includes a suspension beam, a hydraulic cylinder mounted at the bottom of the suspension beam, mounting plates fixed at the bottom of the suspension beam and on both sides of the hydraulic cylinder, a first rotating arm horizontally connected to the stroke rod of the hydraulic cylinder, the first rotating arm being rotatably connected to the mounting plate, a second rotating arm rotatably connected to the end of the first rotating arm away from the hydraulic cylinder, and a shaft rotatably connected to the first and second rotating arms being slidably connected to the mounting plate, a mounting groove provided inside the suspension beam and at the top of the first and second rotating arms, and a pull plate rotatably connected to the end of the second rotating arm away from the first rotating arm, and the pull plate being rotatably connected to the mounting plate;

[0011] A tension sensor is installed at the bottom of the pull plate, and a tension wheel is installed at the bottom of the tension sensor;

[0012] A protective structure is installed at the bottom of the mounting plate and outside the pull plate and the tension sensor.

[0013] The protective structure includes two mounting pieces, which are respectively mounted on the bottom of the two mounting plates, and a first protective frame is fixed to the bottom of each mounting piece.

[0014] A second protective frame is fixed to the bottom of the first protective frame, and the diameter of the second protective frame is larger than the diameter of the first protective frame.

[0015] The bottom of the second protective frame is fixed with a third protective frame, and the third protective frame is inclined toward the center of the second protective frame, thereby forming a hollow inverted truncated cone.

[0016] The bottom of the third protective frame is fixed with a flexible blocking frame, which is made of flexible material.

[0017] One of the mounting plates and the mounting piece are fixedly connected, while the other mounting plate has a mounting groove at its bottom and the other mounting piece is slidably connected within the mounting groove.

[0018] Two abutment pieces are slidably connected in the setting groove, and the two abutment pieces are respectively attached to both ends of the mounting piece. A flexible bellows plate is fixed on the side of the two abutment pieces away from the mounting piece, and the flexible bellows plate is connected to the inner wall of the setting groove.

[0019] The technical effects achieved by this utility model are as follows:

[0020] This utility model protects the tension plate and tension sensor with two first protective frames, which can effectively block straw, gravel and other debris in the field, prevent the tension plate from being entangled and stuck, and prevent the tension sensor from being contaminated by impact. It also ensures stable transmission of the tension plate and accurate detection of the sensor, prevents uncontrolled tension, reduces failure and maintenance costs, improves the reliability of the tensioning device, and ensures efficient and stable operation of the combine harvester. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure between the first protective frame, the third protective frame, and the hydraulic cylinder in this utility model;

[0023] Figure 3 This is a structural diagram of the first protective frame, the second protective frame, and the third protective frame in this utility model;

[0024] Figure 4 This is a schematic diagram of the structure between the mounting plate, the abutment plate, and the setting groove in this utility model.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1. Suspension beam; 2. Hydraulic cylinder; 3. First swing arm; 4. Second swing arm; 5. Pull plate; 6. Mounting slot; 7. Tension sensor; 8. Tension wheel; 9. First protective frame; 10. Second protective frame; 11. Mounting plate; 12. Mounting piece; 13. Third protective frame; 14. Barrier flexible frame; 15. Setting slot; 16. Abutment piece; 17. Flexible bellows plate. Detailed Implementation

[0027] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0028] like Figures 1-4 As shown, a protective structure for a combine harvester belt tensioning mechanism includes a suspension beam 1, a hydraulic cylinder 2 installed at the bottom of the suspension beam 1, and mounting plates 11 fixed at the bottom of the suspension beam 1 and on both sides of the hydraulic cylinder 2. The stroke rod of the hydraulic cylinder 2 is horizontally arranged and rotatably connected to a first rotating arm 3. The first rotating arm 3 is rotatably connected to the mounting plate 11. A second rotating arm 4 is rotatably connected to the end of the first rotating arm 3 away from the hydraulic cylinder 2. The shaft connecting the first rotating arm 3 and the second rotating arm 4 is slidably connected to the mounting plate 11. The mounting plate 11 is provided with a sliding groove, which is set high to allow the shaft to slide upwards but not downwards. An installation groove 6 is provided inside the suspension beam 1 and at the top of the first rotating arm 3 and the second rotating arm 4. A pull plate 5 is rotatably connected to the end of the second rotating arm 4 away from the first rotating arm 3, and the pull plate 5 is rotatably connected to the mounting plate 11. A tension sensor 7 is installed at the bottom of the pull plate 5, and a tension wheel 8 is installed at the bottom of the tension sensor 7. The belt is tensioned through the tension wheel 8.

[0029] See attached document Figure 2 When tensioning the belt, the hydraulic cylinder 2 can be driven, which in turn causes the stroke rod of the hydraulic cylinder 2 to move the first rotating arm 3. This causes the first rotating arm 3 to be rotatably connected to the stroke rod of the hydraulic cylinder 2, and is rotatably connected to the second rotating arm 4. The shaft between the first rotating arm 3 and the second rotating arm 4 is slidably connected to the mounting plate 11, which causes the ends of the first rotating arm 3 and the second rotating arm 4 to move upward. When the second rotating arm 4 rotates, it drives the pull plate 5 to rotate. The pull plate 5 drives the tension sensor 7 to move, and drives the tensioning wheel 8 to move upward, thereby tensioning the belt. The tension sensor 7 can transmit its own tension and other signals to a controller and a chip. The chip analyzes whether the tension needs to be used to tension the belt and how much tension is needed. The controller controls the extension length of the hydraulic cylinder 2. For details, please refer to the combine harvester belt tensioning device proposed in publication number CN209458362U.

[0030] A protective structure is installed at the bottom of the mounting plate 11 and outside the pull plate 5 and the tension sensor 7.

[0031] See attached document Figure 2 The protective structure includes two mounting plates 12, which are respectively mounted on the bottom of two mounting plates 11. The bottom of the mounting plates 12 is fixed with a first protective frame 9. The first protective frame 9 protects the pull plate 5 and the tension sensor 7, thereby preventing the combine harvester from being interfered with by debris in the field when it is working. The two first protective frames 9 can be connected by screws to form a closed ring.

[0032] See attached document Figures 2-3 The bottom of the first protective frame 9 is fixed with a second protective frame 10, and the diameter of the second protective frame 10 is larger than that of the first protective frame 9. By setting the second protective frame 10, when the pull plate 5 is rotated under force, the larger diameter of the second protective frame 10 reduces the obstruction to the pull plate 5, ensuring the rotation effect of the pull plate 5, and thus ensuring the tensioning effect of the belt.

[0033] See attached document Figures 2-3 A third protective frame 13 is fixed to the bottom of the second protective frame 10, and the third protective frame 13 is inclined towards the center of the second protective frame 10, thus forming a hollow inverted truncated cone. The shape of the third protective frame 13 minimizes the movement of debris from the bottom of the third protective frame 13 upwards, thereby further ensuring the protection of the pull plate 5 and the tension sensor 7. A blocking flexible frame 14 is fixed to the bottom of the third protective frame 13. The blocking flexible frame 14 is made of flexible material. The blocking flexible frame 14 can deform when it is subjected to pressure on the third protective frame 13, thus ensuring the normal use of the tension sensor 7 when it comes into contact with the blocking flexible frame 14. The material of the blocking flexible frame 14 can be rubber, silicone, etc.

[0034] See attached document Figure 4One mounting plate 11 and mounting piece 12 are fixedly connected. The other mounting plate 11 has a mounting groove 15 at its bottom, and the other mounting piece 12 is slidably connected in the mounting groove 15. When the two first protective frames 9 are screwed together, if the connection is not good, the other mounting piece 12 can be slid, thereby causing the mounting piece 12 to move the first protective frame 9 until the two first protective frames 9 can be fixed by screws. Two abutting pieces 16 are slidably connected in the mounting groove 15, and the two abutting pieces 16 are respectively attached to the two ends of the mounting piece 12. Flexible bellows plates 17 are fixed on the side of the two abutting pieces 16 away from the mounting piece 12, and the flexible bellows plates 17 are connected to the inner wall of the mounting groove 15. When the mounting piece 12 slides, it can drive one of the abutting pieces 16 to move, and the other abutting piece 16 moves with the mounting piece 12. Through the setting of the flexible bellows plates 17, the flexible bellows plates 17 can protect the mounting groove 15, prevent debris from entering the mounting groove 15, and ensure the sliding effect of the mounting piece 12.

[0035] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A protective structure for a combine harvester belt tensioning mechanism, comprising a suspension beam (1), characterized in that: A hydraulic cylinder (2) is installed at the bottom of the suspension beam (1). Mounting plates (11) are fixed at the bottom of the suspension beam (1) and on both sides of the hydraulic cylinder (2). The stroke rod of the hydraulic cylinder (2) is horizontally set and rotatably connected to a first rotating arm (3). The first rotating arm (3) is rotatably connected to the mounting plate (11). A second rotating arm (4) is rotatably connected to the end of the first rotating arm (3) away from the hydraulic cylinder (2). The shaft connecting the first rotating arm (3) and the second rotating arm (4) is slidably connected to the mounting plate (11). A mounting groove (6) is provided in the suspension beam (1) and at the top of the first rotating arm (3) and the second rotating arm (4). A pull plate (5) is rotatably connected to the end of the second rotating arm (4) away from the first rotating arm (3). The pull plate (5) is rotatably connected to the mounting plate (11). A tension sensor (7) is installed at the bottom of the pull plate (5), and a tension wheel (8) is installed at the bottom of the tension sensor (7). A protective structure is installed at the bottom of the mounting plate (11) and outside the pull plate (5) and the tension sensor (7).

2. The protective structure for a combine harvester belt tensioning mechanism according to claim 1, characterized in that: The protective structure includes two mounting pieces (12), and the two mounting pieces (12) are respectively mounted on the bottom of the two mounting plates (11), and the bottom of the mounting pieces (12) is fixed with a first protective frame (9).

3. The protective structure for a combine harvester belt tensioning mechanism according to claim 2, characterized in that: The bottom of the first protective frame (9) is fixed with a second protective frame (10), and the diameter of the second protective frame (10) is greater than the diameter of the first protective frame (9).

4. The protective structure for a combine harvester belt tensioning mechanism according to claim 3, characterized in that: The bottom of the second protective frame (10) is fixed with a third protective frame (13), and the third protective frame (13) is inclined toward the center of the second protective frame (10), thereby forming a hollow inverted truncated cone.

5. The protective structure for a combine harvester belt tensioning mechanism according to claim 4, characterized in that: The bottom of the third protective frame (13) is fixed with a blocking flexible frame (14), which is made of flexible material.

6. The protective structure for a combine harvester belt tensioning mechanism according to claim 2, characterized in that: One of the mounting plates (11) and the mounting piece (12) are fixedly connected, and the other mounting plate (11) has a mounting groove (15) at its bottom, and the other mounting piece (12) is slidably connected in the mounting groove (15).

7. The protective structure for a combine harvester belt tensioning mechanism according to claim 6, characterized in that: Two abutment pieces (16) are slidably connected in the setting groove (15), and the two abutment pieces (16) are respectively attached to both ends of the mounting piece (12). A flexible bellows plate (17) is fixed on the side of the two abutment pieces (16) away from the mounting piece (12), and the flexible bellows plate (17) is connected to the inner wall of the setting groove (15).

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