Belt transmission device for agricultural machinery

Abstract

The belt transmission device comprises a bottom plate and a cover body, the cover body and the bottom plate are connected to form a containing cavity, a first belt wheel, a second belt wheel and a belt are arranged in the containing cavity, an air inlet opposite to the end face of the first belt wheel is formed in the cover body, and an air outlet opposite to the end face of the second belt wheel is formed in the cover body. A spoke of the first belt wheel is provided with an air channel, the first belt wheel is provided with air guide blades, and the bottom plate is provided with an air outlet opposite to the end face of the first belt wheel. According to the scheme, the problem that in the prior art, a belt is prone to being poor in durability due to too high temperature is solved.

Description

Technical Field

[0001] The utility model relates to a belt transmission device for agricultural machinery. Background Art

[0002] The working environment of agricultural machinery is generally harsh, and the load during operation is large. When a belt drive device is used for power transmission, the torque transmitted by the belt is large, so the belt is prone to overheating, which in turn reduces the durability of the belt.

[0003] Chinese patent document CN211861147U discloses a heat dissipation device for a belt transmission mechanism of an agricultural and forestry harvester, comprising: a deflector that covers the belt transmission mechanism and is fixed to the agricultural and forestry harvester, the deflector being provided with an airflow inlet hole and an airflow outlet hole; a mounting plate mounted on the pulley to rotate with the pulley; and a plurality of blades arranged at intervals on the axial end face of the mounting plate, one end of the blade being fixed to the mounting plate, and the other end of the blade being a free end. The effect of this scheme is: when the pulley rotates, the mounting plate rotates with the pulley, the blades accelerate the airflow, and the air outside the deflector enters the inside of the deflector to cool the belt. Under the force generated by the blades, the accelerated airflow in the deflector is discharged to the outside of the deflector through the airflow outlet hole, so that the temperature inside the deflector is kept equal to that of the atmosphere, and the belt obtains continuous heat dissipation, so that the transmission performance of the belt is maintained for a long time.

[0004] Although the solution of the prior art solves the problem of high belt temperature in the belt transmission device to a certain extent, the space used to set the belt transmission device on the agricultural machinery is relatively small, so that the gap between the air deflector and the belt is very small, which in turn leads to large air flow resistance at the air flow outlet holes on the air deflector, slowing the air flow exchange inside the air deflector and affecting the cooling effect of the belt; at the same time, in the use environment of the agricultural machinery, the air flow outlet holes are set on the air deflector, and the opening direction of the air flow outlet holes is upward, which makes it easy for debris generated during the operation of the agricultural machinery to fall into the air deflector and affect the operation of the belt transmission device. Utility Model Content

[0005] The utility model aims to provide a belt transmission device for agricultural machinery, so as to solve the problem in the prior art that the belt is prone to poor durability due to excessive temperature.

[0006] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a belt transmission device for agricultural machinery, including a base plate and a cover body, the cover body is connected to the base plate and forms a accommodating cavity, a first pulley, a second pulley and a belt are arranged in the accommodating cavity, an air inlet opposite to the end face of the first pulley is arranged on the cover body, an air duct is arranged on the spokes of the first pulley, an air guide blade is arranged on the first pulley, and an air outlet opposite to the end face of the first pulley is arranged on the base plate.

[0007] Preferably, the air outlet is fan-shaped and is located on a side of the first pulley away from the second pulley.

[0008] Preferably, the wind guide blades are distributed in an annular array along the axis of the first pulley to form spokes of the first pulley.

[0009] Preferably, a centrifugal blade is provided at one end of the first pulley facing the bottom plate.

[0010] Preferably, a tensioning mechanism cooperating with the belt is connected to the bottom plate.

[0011] Preferably, a brake mechanism cooperating with the second pulley is connected to the base plate.

[0012] The utility model has the following beneficial effects:

[0013] 1. When the belt transmission device is working, the first pulley rotates to drive the air guide blades to rotate, thereby generating an air pressure difference on both sides of the first pulley, so that the external air enters the accommodating chamber from the air inlet of the cover body to cool the belt, and the air with higher temperature in the accommodating chamber is discharged from the air outlet on the bottom plate, thereby avoiding the problem of excessive temperature of the belt, which is beneficial to improving the durability of the belt. Compared with the prior art, the service life of the belt is significantly extended, and at the same time, it also avoids as much as possible that debris enters the accommodating chamber under the action of gravity and affects the operation of the belt transmission device.

[0014] 2. The arrangement of the air outlet is conducive to making the air entering the accommodating cavity from the outside flow better in the accommodating cavity and exchange heat with the belt, thereby improving the cooling effect on the belt and further improving the durability of the belt.

[0015] 3. The air guide blades are used to form the spokes of the first pulley. This can not only fully utilize the air guide blades as part of the structure of the first pulley to play a supporting role, but also help to provide sufficient layout space for the air guide blades, ensuring the air guide blades form an airflow effect, which is beneficial to improve the cooling effect on the belt.

[0016] 4. The use of centrifugal blades can make the airflow in the accommodating chamber cool the belt better, which is beneficial to further improve the durability of the belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of an embodiment of a belt transmission device for agricultural machinery of the utility model;

[0018] Figure 2 This is a front view of an embodiment of a belt transmission device for agricultural machinery of the utility model;

[0019] Figure 3 for Figure 2 Rear view of

[0020] Figure 4 for Figure 2 The state diagram after the cover is removed;

[0021] Figure 5 for Figure 2 AA section view. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The reference numerals in the drawings of the specification include: base plate 1, cover body 2, air inlet 3, air outlet 4, opening 5, second pulley 6, belt 7, brake mechanism 8, first pulley 9, tensioning mechanism 10, air guide blades 11, air duct 12, centrifugal blades 13.

[0024] The embodiment is basically as shown in the attached Figures 1 to 5 As shown: A belt transmission device for agricultural machinery includes a base plate 1 and a cover body 2, wherein the cover body 2 is connected to the base plate 1 and forms an accommodating chamber. A first pulley 9, a second pulley 6 and a belt 7 are arranged in the accommodating chamber, and the mounting shafts of the first pulley 9 and the second pulley 6 pass through the through hole on the base plate 1. In this embodiment, the first pulley 9 is a driving pulley, and the second pulley 6 is a driven pulley. The diameter of the first pulley 9 is greater than the diameter of the second pulley 6. An air inlet 3 opposite to the end face of the first pulley 9 is arranged on the cover body 2, an air duct 12 is arranged on the spoke of the first pulley 9, an air guide blade 11 is arranged on the first pulley 9, and an air outlet 4 opposite to the end face of the first pulley 9 is arranged on the base plate 1.

[0025] In this embodiment, the air outlet 4 is fan-shaped and is located on the side of the first pulley 9 away from the second pulley 6. In this embodiment, the air guide blades 11 are distributed in an annular array along the axis of the first pulley 9 to form the spokes of the first pulley 9, and the gaps between adjacent air guide blades 11 are the air ducts 12. Centrifugal blades 13 are provided at one end of the first pulley 9 facing the base plate 1. In this embodiment, the centrifugal blades 13 and the air guide blades 11 are integrally formed. An opening 5 opposite to the second pulley 6 is provided on the base plate 1. In this embodiment, the opening 5 extends from the edge of the base plate 1 toward the axis of the second pulley 6 to facilitate the installation of the base plate 1. A tensioning mechanism 10 cooperating with the belt 7 is connected to the base plate 1. The tensioning mechanism 10 is a commonly used mechanism in belt transmission devices and will not be described in detail here. A brake mechanism 8 cooperating with the second pulley 6 is connected to the base plate 1. In the present embodiment, the brake mechanism 8 includes a brake block, which is rotatably connected to the base plate 1 and is connected to the base plate 1 via a torsion spring, so that the brake block fits with the second pulley 6 under the action of the torsion spring to achieve braking. The brake mechanism 8 also includes a pull wire for pulling the brake block to separate from the second pulley 6.

[0026] By adopting this solution, when the belt transmission device is working, the first pulley 9 rotates and drives the air guide blades 11 to rotate, thereby generating an air pressure difference on both sides of the first pulley 9, so that the external air enters the accommodating chamber from the air inlet 3 of the cover body 2 to cool the belt 7, and the air with higher temperature in the accommodating chamber is discharged from the air outlet 4 on the bottom plate 1, thereby avoiding the problem of overheating of the belt 7, which is beneficial to improving the durability of the belt 7, and at the same time, it also avoids as much as possible that debris enters the accommodating chamber under the action of gravity and affects the operation of the belt transmission device.

[0027] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A belt transmission device for agricultural machinery, comprising a base plate and a cover body, wherein the cover body is connected to the base plate and forms a receiving cavity, wherein a first pulley, a second pulley and a belt are arranged in the receiving cavity, and an air inlet opposite to an end surface of the first pulley is arranged on the cover body, wherein: An air duct is arranged on the spoke of the first pulley, an air guide blade is arranged on the first pulley, and an air outlet opposite to the end surface of the first pulley is arranged on the bottom plate.

2. A belt transmission device for agricultural machinery according to claim 1, characterized in that: The air outlet is fan-shaped and is located on a side of the first pulley away from the second pulley.

3. A belt transmission device for agricultural machinery according to claim 2, characterized in that: The wind guide blades are distributed in a ring array along the axis of the first pulley to form the spokes of the first pulley.

4. A belt transmission device for agricultural machinery according to claim 1, 2 or 3, characterized in that: A centrifugal blade is arranged at one end of the first pulley facing the bottom plate.

5. A belt transmission device for agricultural machinery according to claim 4, characterized in that: The bottom plate is connected with a tensioning mechanism matched with the belt.

6. A belt transmission device for agricultural machinery according to claim 5, characterized in that: The bottom plate is connected with a brake mechanism matched with the second pulley.

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