A type of belt tensioning fixture with a large range of applications

Abstract

The present invention provides a large-scale belt tensioning tool, which belongs to the technical field of belt tensioning, and specifically includes: a base, a first rotating arm, a pulley shaft and an adjusting device, wherein one end of the first rotating arm is rotatably connected to the base, and the other end is fixed with a pulley shaft, and the adjusting device can adjust the angle between the first rotating arm and the base, and form a fixing effect. The present invention controls the belt tensioning force through the cooperation of the first rotating arm, the second rotating arm and the third rotating arm of the three-linkage, which is convenient for miniaturization of the device, and the position of the pulley shaft can be adjusted at any time according to the tightness of the belt, with a large tensioning range, convenient adjustment, simple operation, strong safety and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of belt tensioning, and in particular to a large-amplitude belt tensioning tool. Background Art

[0002] Belt drive has the characteristics of simple structure, stable transmission, buffering and vibration absorption, low cost, no lubrication, easy maintenance, etc., and is widely used in mechanical transmission. Generally speaking, the belt drive of the existing engine is tested after both the engine and the transmission device are installed. However, the transmission in the field of agricultural machinery, such as harvesters, cannot be tested in the original mode. Because the engine of the harvester not only transmits power to the crawler for walking, but also needs to output power to the threshing assembly for threshing. At present, in the case of no loading of the threshing part, the threshing drive belt must be assembled first, and then the engine must be started for trial operation to test the walking of the harvester. After the belt is installed on the driven wheel, it is inconvenient to disassemble (including the belt and the protective cover), so when conducting the walking test, in order to prevent this part of the belt from affecting the rotation, the belt that drives the threshing part needs to be designed with tooling for pre-tightening. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a large-scale belt tensioning tooling, which controls the position of the pulley shaft through the cooperation of the first rotating arm, the second rotating arm and the third rotating arm of the three-linkage to achieve belt tensioning. Such a structure facilitates the miniaturization of the device, and the position of the pulley shaft can be adjusted at any time according to the tightness of the belt. The tensioning range is large, the adjustment is convenient, the operation is simple, the safety is strong, and the efficiency is high.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A large-scale belt tensioning tool is characterized in that it includes a base, a first rotating arm, a pulley shaft and an adjusting device, wherein one end of the first rotating arm is rotatably connected to the base and the other end is fixed with the pulley shaft, and the adjusting device can adjust the angle between the first rotating arm and the base.

[0006] Furthermore, the adjusting device includes a third rotating arm rotatably connected to the base and a locking device for locking the movement of the third rotating arm.

[0007] Furthermore, the locking device includes a fixing plate fixedly connected to the first rotating arm, a waist-shaped hole is provided at the center of the fixing plate along the length direction of the first rotating arm, one end of the third rotating arm away from its pivot axis movably passes through the waist-shaped hole, and is detachably fixed to the fixing plate by nuts located on both sides of the fixing plate.

[0008] Furthermore, the locking device includes a rotating plate, a side of the rotating plate is pivotally connected to the first rotating arm, and one end of the third rotating arm away from its pivot axis movably passes through the rotating plate and is detachably fixedly connected to the rotating plate via nuts located on both sides of the rotating plate.

[0009] Furthermore, the rotating plate includes a rotating shaft and a second rotating arm fixedly connected to the rotating shaft, and the rotating shaft passes through the first rotating arm and is locked by a nut.

[0010] Furthermore, the rotating plate is composed of an upper metal plate, a lower metal plate and a vibration-damping layer, and the vibration-damping layer is arranged between the upper metal plate and the lower metal plate.

[0011] Furthermore, the vibration-damping layer is made of foam metal.

[0012] Furthermore, a compression spring is sleeved on the third swivel arm, one end of the compression spring abuts against the locking device, and the other end is locked by a nut.

[0013] Furthermore, an adjustment bracket is provided between the first rotating arm and the pulley shaft, and the adjustment bracket is fixed to the first rotating arm by bolts.

[0014] The beneficial effects of the present invention are:

[0015] 1. During the walking test of the harvester crawler, the belt tensioning tool of the present invention is used to replace the driven wheel in the threshing assembly, and the belt on the driving wheel is pre-tensioned to ensure smooth transmission test; it is only necessary to install the belt on the pulley shaft, and then fix the base at a suitable position of the harvester, and there is no need to provide a separate installation space. The pulley shaft rotates around the base, and the position of the first rotating arm is adjusted to achieve the tensioning action, and the position of the pulley shaft can be adjusted at any time according to the tightness of the belt, which is convenient to adjust, ensuring the transmission efficiency of the belt and facilitating the adjustment of the harvester crawler test process under different environments.

[0016] 2. The first swivel arm, the second swivel arm and the third swivel arm form a three-link structure. Therefore, the third swivel arm rotates to drive the second swivel arm and the first swivel arm to swivel, so as to control the position of the pulley shaft and realize belt tensioning. When the belt tensioning degree is appropriate, the nuts on both sides of the second swivel arm of the third swivel arm are tightened to fix the pulley shaft in a suitable position. Compared with the method of performing the crawler walking test after the driven wheel is installed, the present invention is quick to operate and easy to adjust. It is convenient for real-time adjustment of the transmission efficiency during the installation of the harvester, which saves installation time. After the test is completed, it is easy to disassemble without affecting the subsequent installation and debugging of the threshing assembly.

[0017] 3. The first slewing arm, the second slewing arm, the third slewing arm and the base form a triangular structure, which increases the stability of the belt tensioning tooling, makes the overall operation of the harvester more stable and reliable, and improves the accuracy of the walking test results.

[0018] 4. The second rotating arm of the plate-like structure can rotate around the rotating axis, ensuring that it is always perpendicular to the third rotating arm during the rotation process. Compared with point contact, this surface contact method increases the contact area with the nut and the third rotating arm, tightens it firmly, prevents the nut and the third rotating arm from slipping, further increases the stability of the device, and ensures the smooth progress of the crawler walking test and the accuracy of the test results.

[0019] 5. The fixed plate and the rotating plate are provided with foam metal for vibration reduction, which has excellent impact resistance. When the harvester is tested for walking, the fuselage has a large vibration, so the hysteresis deformation of the foam metal is used to dissipate or absorb the energy input into the device, reduce the vibration response of the device, thereby avoiding the loosening or collapse of the three-link structure and increasing the stability of the device.

[0020] 6. The third swivel arm is equipped with a compression spring, which can further absorb and reduce the vibration and impact during the walking test and increase the stability of the device. At the same time, through the synergistic effect of the compression spring and the foam metal, the deformation impact of each other can be offset, so that the device can remain stable even when conducting walking tests on uneven roads in the field.

[0021] 7. The tensioning force and tensioning range of the present invention are adjustable. The distance between the driving wheel and the driven wheel in the maximum tensioning state is twice that in the minimum tensioning state. The tensioning range is large and the working range is wide.

[0022] 8. The size of the adjusting bracket is designed to be different according to the structure of different models. When changing the model, you only need to replace the adjusting bracket. By replacing the adjusting bracket, it can adapt to the production of more models, with a wide range of applications and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of the belt tensioning tool of the present invention;

[0025] Figure 2 is a schematic diagram of a belt tensioning tool according to a first embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of a belt tensioning tool according to a second embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the minimum tensioning state of the belt tensioning tool of the present invention;

[0028] Figure 5 It is a schematic diagram of the maximum tensioning state of the belt tensioning tool of the present invention.

[0029] In the figure, 1, base; 2, first rotating arm; 3, pulley shaft; 4, rotating plate; 41, rotating shaft; 42, second rotating arm; 5, third rotating arm; 6, adjusting bracket; 7, fixing plate; 8, compression spring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figures 1 to 5 As shown, a large-scale belt tensioning tool is characterized in that it includes a base 1, a first rotating arm 2, a pulley shaft 3 and an adjusting device. One end of the first rotating arm 2 is rotatably connected to the base 1, and the other end is fixed with a pulley shaft 3. The adjusting device can adjust the angle between the first rotating arm 2 and the base 1, and form a fixing effect. The belt tensioning tool of the present invention is used to tension the belt during the crawler walking test during the installation of the harvester. At this time, the threshing assembly has not been installed. In order to make the engine test run, it is necessary to use this device to replace the driven wheel in the threshing assembly, pre-tension the belt on the driving wheel, and then perform the transmission test. The belt tensioning tool of the present invention only needs to install the belt on the pulley shaft 3, and then fix the base 1 at a suitable position of the harvester to achieve the tensioning action, and no separate installation space is required. Compared with the prior art, a tool tensioning method needs to be designed separately between the driving wheel and the driven wheel. The present invention saves installation space. When the tension of the belt needs to be adjusted, it is only necessary to adjust the position of the first rotating arm 2 so that the first rotating arm 2 rotates around the base 1, and the position of the pulley shaft 3 can be adjusted accordingly. When the first rotating arm 2 rotates toward the side close to the base 1, the pulley shaft 3 moves in a relative direction away from the driving wheel, thereby increasing the distance between the driving wheel and the pulley shaft 3 and tensioning the belt. It has a simple structure, is easy to operate, does not affect the transmission effect, and reduces belt wear.

[0032] In this embodiment, the adjusting device includes a third rotating arm 5 rotatably connected to the base 1 and a locking device for locking the movement of the third rotating arm 5 .

[0033] In this embodiment, the locking device includes a fixing plate 7 fixedly connected to the first rotating arm 2, and a waist-shaped hole is provided at the center of the fixing plate 7 along the length direction of the first rotating arm 2. The end of the third rotating arm 5 away from its pivot axis movably passes through the waist-shaped hole and is detachably fixedly connected to the fixing plate 7 through nuts located on both sides of the fixing plate 7. Figure 2 As shown (the compression spring 8 is not shown in the figure), in this embodiment, the second rotating arm 42 is rotationally connected to the first rotating arm 2, and the third rotating arm 5 slides in the waist-shaped hole of the fixed plate 7. The third rotating arm 5 rotates to change the distance in the waist-shaped hole, thereby driving the first rotating arm 2 to operate in conjunction, thereby controlling the position of the pulley shaft 3 and achieving belt tensioning.

[0034] In another preferred embodiment, the locking device includes a rotating plate 4, the side of the rotating plate 4 is pivotally connected to the first rotating arm 2, and the end of the third rotating arm 5 away from its pivot axis movably penetrates the rotating plate 4 and is detachably fixedly connected to the rotating plate 4 through nuts located on both sides of the rotating plate 4. The rotating plate 4 includes a rotating shaft 41 and a second rotating arm 42 fixedly connected to the rotating shaft 41, and the rotating shaft 41 passes through the first rotating arm 2 and is locked by nuts. Figure 3 As shown in the figure (compression spring 8 is not shown), the second rotating arm 42 of the plate-like structure can always remain perpendicular to the third rotating arm 5 during the rotation process. Compared with the structure of the waist-shaped hole, the original point contact is changed to surface contact, which increases the contact area with the nut and the third rotating arm 5, tightens firmly, prevents the nut and the third rotating arm 5 from slipping, and increases the stability of the device. In this embodiment, the second rotating arm 42 is rotationally connected to the first rotating arm 2 through the rotating shaft 41, and the third rotating arm 5 is rotationally connected to the second rotating arm 42, and then indirectly connected to the first rotating arm 2, forming a three-link structure. When any rotating arm rotates, the other two rotating arms will be driven to rotate. Therefore, the third rotating arm 5 rotates, driving the second rotating arm 42 and the first rotating arm 2 to work in conjunction, thereby controlling the position of the pulley shaft 3 and achieving belt tensioning. The third rotating arm 5 is fixed to the second rotating arm 42 by a nut, so that the positions of the first rotating arm 2, the second rotating arm 42, and the third rotating arm 5 can be fixed, and the positioning of the pulley shaft 3 can be achieved. Compared with the method of performing a crawler walking test after the driven wheel is installed, the present invention is quick to operate, convenient for transmission adjustment during the installation of the harvester, and saves installation time. Secondly, the first rotating arm 2, the second rotating arm 42, the third rotating arm 5 and the base 1 form a triangular structure, which increases the stability of the belt tensioning tooling, makes the overall operation of the harvester more stable and reliable, and improves the accuracy of the walking test results.

[0035] In this embodiment, the angle between the third rotating arm 5 and the base 1 is 16-24°, and the angle between the first rotating arm 2 and the base 1 is 10-80°. The three rotating devices of the present invention restrict each other, limiting the maximum tension of the belt, and preventing the first rotating arm 2 from excessively rotating around the base 1, thereby generating excessive tension and causing the belt to tear. Figures 3-4 As shown in the figure (the compression spring 8 is not shown), in the initial state, the angle between the third rotating arm 5 and the base 1 is α2, α2=24°, and the angle between the first rotating arm 2 and the base 1 is α1, α1=80°. At this time, the belt is in the minimum tension state. When the third rotating arm 5 rotates toward the side close to the base 1, it drives the first rotating arm 2 close to the base 1, and rotates until the angle between the third rotating arm 5 and the base 1 is α4, α4=16°, and the angle between the first rotating arm 2 and the base 1 is α3, α3=10°. At this time, the belt is in the maximum tension state, and the distance between the driving wheel and the pulley shaft 3 is twice that of the minimum tension state.

[0036] In this embodiment, the fixed plate 7 and the rotating plate 4 are composed of an upper metal plate, a lower metal plate and a vibration-damping layer, and the vibration-damping layer is arranged between the upper metal plate and the lower metal plate.

[0037] In this embodiment, the vibration reduction layer is made of foam metal, which has certain strength, rigidity, ductility and additivity. Since the foam metal has certain strength and rigidity, it can support the third swing arm 5; secondly, the foam metal contains foam pores. When the foam metal is under pressure, the force-bearing area increases due to the collapse of the pores and the strain hardening effect of the material, so that the foam metal has excellent shock absorption characteristics. When the harvester is tested for walking, the fuselage has a large vibration. Therefore, the hysteresis deformation of the vibration reduction layer is used to dissipate or absorb the energy input into the device, reduce the vibration response of the device, thereby avoiding the loosening or collapse of the three-link structure and increasing the stability of the device.

[0038] In this embodiment, a compression spring 8 is mounted on the third swing arm 5, one end of the compression spring 8 abuts against the locking device, and the other end is locked by a nut. Adding the compression spring 8 can further absorb and reduce the vibration and impact during the walking test, increase the stability of the device, and the way the nut is fixed can change the compression degree of the compression spring 8 by adjusting the position of the nut on the third swing arm 5, thereby adjusting the force of the compression spring 8 to meet the requirements of absorbing vibration and impact energy in different environments. Secondly, although the compression spring 8 can absorb vibration and impact, the compression spring 8 itself will also have reciprocating motion, and the motion of the compression spring 8 is transmitted to the foam metal and consumed by the hysteresis deformation of the foam metal. At the same time, the deformation of the foam metal is transmitted to the compression spring 8 and can also be consumed by the deformation of the compression spring 8; therefore, through the synergistic effect of the compression spring 8 and the foam metal, the deformation impact of each other can be offset, so that the device can remain stable even when the walking test is carried out on an uneven road in the field.

[0039] In this embodiment, an adjustment bracket 6 is provided between the first slewing arm 2 and the pulley shaft 3, and the adjustment bracket 6 is fixed to the first slewing arm 2 by bolts. The axial direction of the adjustment bracket 6 is parallel to the first slewing arm 2. The size of the adjustment bracket 6 is designed to be different according to the structure of different models, and only the adjustment bracket 6 needs to be replaced when the model is changed. By replacing the adjustment bracket 6, the production of more models can be adapted, the application range is wide, and the practicality is strong. Secondly, the bolt connection method is easy to disassemble and the adjustment bracket 6 is convenient to replace.

[0040] The belt tensioning tool of the present invention can be used not only to tension the belt during the crawler walking test during the installation of the harvester, but also to tension the transmission belt between the driving wheel and the driven wheel. The pulley shaft 3 is used as a tensioning wheel and can be installed on one side of the belt. At present, the tensioning degree of the tensioning device of each manufacturer has basically not changed, and the working range is small. It is easy to cause the tensioning wheel to loosen during the long-term high-speed movement of the belt, so that the transmission belt loosens again, seriously affecting the transmission efficiency; secondly, the belt tensioning degree is fixed and cannot be adjusted according to different use environments. The adaptability and interchangeability are poor and cannot adapt to the production of more models. The belt tensioning tool of the present invention can adjust the tensioning force and tensioning amplitude through the adjustment of the three-link structure. The position of the pulley shaft 3 can be adjusted at any time according to the tightness of the belt. By replacing the adjustment bracket 6, it can adapt to the belt tensioning and fixing of more models, and the adjustment space required for the tensioning mechanism is small, and manual operation is convenient.

Claims

1. A large-scale belt tensioning tool, used to replace the driven wheel in the harvester threshing assembly during the harvester crawler walking test, characterized in that: The invention comprises a base (1), a first swivel arm (2), a pulley shaft (3) and an adjusting device, wherein one end of the first swivel arm (2) is rotatably connected to the base (1), and the other end is fixed with the pulley shaft (3), an adjusting bracket (6) is arranged between the first swivel arm (2) and the pulley shaft (3), and the adjusting device can adjust the angle between the first swivel arm (2) and the base (1), and the adjusting device comprises a third swivel arm (5) pivotally connected to the base (1) and a locking device for locking the movement of the third swivel arm (5), and the locking device comprises a rotating plate ( 4), the side of the rotating plate (4) is pivotally connected to the first rotating arm (2), the end of the third rotating arm (5) away from its pivot axis movably penetrates the rotating plate (4), and is detachably fixedly connected to the rotating plate (4) through nuts located on both sides of the rotating plate (4), the rotating plate (4) is composed of an upper metal plate, a lower metal plate and a vibration-damping layer, the vibration-damping layer is arranged between the upper metal plate and the lower metal plate, and a compression spring (8) is sleeved on the third rotating arm (5), one end of the compression spring (8) abuts against the locking device, and the other end is locked by a nut.

2. The large-amplitude belt tensioning tool according to claim 1, characterized in that: The rotating plate (4) comprises a rotating shaft (41) and a second rotating arm (42) fixedly connected to the rotating shaft (41); the rotating shaft (41) passes through the first rotating arm (2) and is locked by a nut.

3. The large-amplitude belt tensioning tool according to claim 2, characterized in that: The vibration-damping layer is made of foam metal.

4. The large-amplitude belt tensioning tool according to claim 1, characterized in that: The adjustment bracket (6) is fixed on the first slewing arm (2) by means of bolts.

Images