Internal eccentric type swing arm driving mechanism suitable for large feeding amount

Abstract

The utility model relates to an internal eccentric swing arm driving mechanism suitable for large feeding quantity. The internal eccentric swing arm driving mechanism comprises a rotating shaft, an internal eccentric wheel, a bearing and a swing arm, the inner eccentric wheel is of a wheel body structure with the outer surface being a round face and provided with an inner input hole, the inner input hole is eccentrically formed, and the output end of the rotating shaft is matched with the inner input hole in an inserted mode and forms limiting fit in the circumferential direction. A bearing installation hole is formed in the power input end of the swing arm, the bearing is installed in the bearing installation hole, and the inner ring face of the bearing is in interference fit with the outer surface of the inner eccentric cam. The power input end of the swing arm is directly and rotationally connected to the outer circle face of the inner eccentric wheel through the bearing, the swing arm is directly driven to move through movement of the outer circle face of the inner eccentric wheel, the problem that dead points appear in the movement process of an existing outer eccentric wheel is solved, good movement stability is achieved, and the transmission efficiency is high. The large feeding amount requirement is well met, in addition, the compact design of the mechanism is achieved, and the occupied space of the mechanism is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of agricultural harvesters, relates to a grain harvesting cleaning system, and specifically relates to an inner eccentric swing arm driving mechanism suitable for a large feeding amount. Background Art

[0002] The regular swing of the swing arm in the grain cleaning system of the existing grain harvester is achieved by an external eccentric cam driving mechanism, specifically, including a rotating shaft 3, an external eccentric cam 5, a bearing 2 and a swing arm 1. An eccentric shaft 5.2 is provided on the side of the external eccentric cam that deviates from the center hole 5.1. The output end of the rotating shaft is fixedly connected with the center hole of the external eccentric cam by insertion, and the swing arm is provided on the outside of the external eccentric cam. A bearing hole is provided at the input end of the swing arm, and a bearing is installed. The inner ring of the bearing is tightly matched with the end of the eccentric shaft. The rotation of the rotating shaft drives the external eccentric cam to rotate, and the rotation of the external eccentric cam realizes the conversion of its own circular rotary motion into the swing of the swing arm, and finally realizes the swing of the screen box. However, with the increase of the feed amount, the stress on the eccentric bearing increases, and the problems of the structural strength and position limitation of the eccentric cam itself are gradually exposed, and the conditions such as breakage and eccentric shaft bending are difficult to overcome. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model proposes an inner eccentric swing arm drive mechanism suitable for large feeding volume, which has compact structure, small occupied space, high transmission efficiency and good stability and can better meet the demand for large feeding volume.

[0004] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0005] An internal eccentric swing arm driving mechanism suitable for large feeding amount comprises a rotating shaft, an internal eccentric wheel, a bearing and a swing arm; the internal eccentric wheel is a wheel body structure with a circular outer surface and an inner input hole, the inner input hole is eccentrically arranged, the output end of the rotating shaft is plug-fitted with the inner input hole on the internal eccentric wheel, and a limited fit is formed along the circumferential direction; the power input end of the swing arm is provided with a bearing mounting hole, the bearing is mounted in the bearing mounting hole, and the inner annular surface of the bearing is interference fit with the outer surface of the internal eccentric cam.

[0006] Moreover, the output end of the rotary shaft adopts a cylindrical shaft end, the inner input hole of the inner eccentric wheel adopts a round hole matching the size of the cylindrical shaft end, and the output end of the rotary shaft is connected to the inner input hole of the inner eccentric wheel through a key.

[0007] Moreover, the output end of the rotating shaft adopts a hexagonal shaft end, the inner input hole on the inner eccentric wheel adopts a hexagonal hole with the same cross-sectional shape as the output end of the rotating shaft, and the rotating shaft and the inner eccentric wheel are connected through the plug-in matching structure of the hexagonal shaft and the hexagonal hole.

[0008] The advantages and positive effects of the utility model are:

[0009] 1. The utility model makes the power input end of the swing arm directly rotatably connected to the outer surface of the inner eccentric wheel through the bearing, and directly drives the swing arm to move through the movement of the outer surface of the inner eccentric wheel. This movement mode avoids the problem of dead points in the existing outer eccentric wheel during movement, achieves better movement stability, has the advantage of high transmission efficiency, and better meets the demand for large feeding volume.

[0010] 2. The utility model directly rotates the power input end of the swing arm to be connected to the outer surface of the inner eccentric wheel through a bearing. Compared with the existing connection form in which the power input end of the swing arm is arranged on the outer side of the outer eccentric cam, the utility model realizes a compact design of the mechanism and reduces the space occupied by the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the inner eccentric wheel in the utility model;

[0013] Figure 3 It is a schematic diagram of the motion trajectory of the inner eccentric wheel far from the center of the inner input hole in the utility model;

[0014] Figure 4 It is a structural schematic diagram of an existing external eccentric swing arm drive mechanism;

[0015] Figure 5 yes Figure 4 Front view of the Chinese and foreign eccentric cams;

[0016] Figure 6 yes Figure 5 Stereoscopic diagram of the Chinese and foreign eccentric cams. DETAILED DESCRIPTION

[0017] The structure of the utility model is further described below with reference to the accompanying drawings and through embodiments. It should be noted that the embodiments are descriptive rather than restrictive.

[0018] An internal eccentric swing arm drive mechanism suitable for large feed rates, see Figure 1-Figure 6 The invention point is: it includes a rotating shaft 3, an inner eccentric wheel 4, a bearing 2, and a swing arm 1.

[0019] The outer surface of the inner eccentric wheel is a circular surface, and an inner input hole is provided on the inner eccentric wheel at a position deviating from the center of the wheel. The rotary shaft is a power input shaft, and power can be input through a separate motor, or it can be connected to the power transmission system of the cleaning system of the grain harvester through a transmission mechanism. The output end of the rotary shaft is plug-fitted with the inner input hole on the inner eccentric wheel, and a limit fit is formed along the circumferential direction to provide power for the rotation of the inner eccentric wheel. A bearing mounting hole is provided at the power input end of the swing arm, and the bearing is installed in the bearing mounting hole, and the inner annular surface of the bearing is interference fit with the outer surface of the inner eccentric cam. The bearing plays a role of inheritance, which not only transmits power but also avoids hard friction between the inner eccentric wheel and the rocker arm.

[0020] In the above structure, the output end of the rotary shaft and the inner input hole of the inner eccentric wheel are preferably connected in the following two ways.

[0021] Mode 1: The output end of the rotating shaft adopts a cylindrical shaft end, the inner input hole of the inner eccentric wheel adopts a round hole matching the size of the cylindrical shaft end, and the output end of the rotating shaft is connected to the inner input hole of the inner eccentric wheel by a key.

[0022] Method 2: The output end of the rotating shaft adopts a hexagonal shaft end, and the inner input hole on the inner eccentric wheel adopts a hexagonal hole with the same cross-sectional shape as the output end of the rotating shaft. The rotating shaft and the inner eccentric wheel are connected through the plug-in matching structure of the hexagonal shaft and the hexagonal hole.

[0023] In the technical scheme of the utility model: the center of the input hole of the inner eccentric wheel is not concentric with the wheel center 4.2, and is eccentrically arranged. Under the rotation of the rotary shaft, the inner eccentric wheel rotates with the center of the inner input hole as the center of the circle. The center of the input hole of the inner eccentric wheel 4.1 is point A, the proximal end (center of the input hole) is point B, and the distal end (center of the input hole) is point C. Figure 3 Points B and C rotate around point A to realize their own eccentric rotation, and drive the rocker arm to swing in an elliptical shape. The output end of the rocker arm is connected to the screen box, thereby realizing the swing of the screen box.

[0024] The existing external eccentric swing arm drive mechanism uses the eccentric principle to transmit the power from the power input shaft through the rotation of the eccentric hub itself, so as to realize the rotation of the eccentric shaft around the power input shaft, and transmit the rotary motion to the swing arm with interference fit on the outer ring of the bearing through the bearing installed on the external eccentric shaft 5, so as to realize the rotation of the swing arm along with the eccentric shaft of the eccentric hub around the power input shaft, and realize the conversion from circular motion to swinging motion under the action of the support arm in the mechanism. With the increasing feed amount, the position strength of the eccentric shaft cannot be increased indefinitely, and reliable power transmission and conversion cannot be achieved, and the potential possibility of its own deformation and fracture increases exponentially. The internal eccentric swing arm drive mechanism also adopts the eccentric principle, but the difference is that the eccentric hole is directly designed as the power input hole, and the rotation of the power input shaft drives itself to rotate around the eccentric hole. Figure 3 As shown in the figure, A is the input point, B is the near end, and C is the far end. When the inner eccentric wheel rotates around point A, points B and C start to rotate at the same time, achieving Figure 3 The motion trajectory of point C is shown in the figure. The same thing is that the eccentric rotation is realized by the same eccentric principle. The difference is that the eccentric shaft position of the external eccentric type is the stress concentration position, where the stress concentration effect is obvious, and excessive transmission power will easily cause bending, breaking, etc.; the internal eccentric type itself is the power transmission medium, there is no stress concentration point, and the transmission power is not limited by the weak point, which can adapt to the cleaning process of large feed volume.

[0025] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An internal eccentric swing arm drive mechanism suitable for large feeding amount, characterized by: It includes a rotating shaft, an inner eccentric wheel, a bearing, and a swing arm; the inner eccentric wheel is a wheel body structure with a circular outer surface and an inner input hole, the inner input hole is eccentrically arranged, the output end of the rotating shaft is plug-fitted with the inner input hole on the inner eccentric wheel, and a limited fit is formed along the circumferential direction; the power input end of the swing arm is provided with a bearing mounting hole, the bearing is installed in the bearing mounting hole, and the inner annular surface of the bearing is interference fit with the outer surface of the inner eccentric cam.

2. The inner eccentric swing arm driving mechanism suitable for large feeding amount according to claim 1 is characterized in that: The output end of the rotary shaft adopts a cylindrical shaft end, the inner input hole of the inner eccentric wheel adopts a round hole matching the size of the cylindrical shaft end, and the output end of the rotary shaft is connected to the inner input hole of the inner eccentric wheel through a key.

3. The inner eccentric swing arm driving mechanism suitable for large feeding amount according to claim 1 is characterized in that: The output end of the rotating shaft adopts a hexagonal shaft end, the inner input hole on the inner eccentric wheel adopts a hexagonal hole with the same cross-sectional shape as the output end of the rotating shaft, and the rotating shaft and the inner eccentric wheel are connected through the plug-in matching structure of the hexagonal shaft and the hexagonal hole.

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