JPH0249223Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is based on a grain tank in which a horizontal screw conveyor is rotatably attached to the upper end of a vertical screw conveyor connected to a grain tank, and the horizontal screw conveyor is rotated by a manual handle. The present invention relates to a grain delivery device for a combine harvester in which a screw conveyor is configured to be able to be rotated.

[Conventional technology]

Conventionally, a ring gear is fitted into a rotating tube that is fitted onto the upper end of the vertical screw conveyor so that it can rotate together with the horizontal screw conveyor, and a spur gear that can be driven in engagement with the ring gear is extended from the grain tank. The rotating drive mechanism was attached to a rotary shaft, and the swing drive mechanism was configured to transmit the operating force of the manual handle to the rotary shaft via a bevel and a chain. (For example, Japanese Utility Model Application Publication No. 59-29160) [Problems to be solved by the invention] However, since the swing drive mechanism simply employs a mechanism with high transmission efficiency such as a spur gear, it is difficult to move a combine harvester onto a slope, etc. When the screw conveyor is in the position, there is a risk that the traversing screw conveyor may rotate unexpectedly due to its own weight. For this reason, the rotation of the lateral screw conveyor is reversely transmitted to the manual handle via the rotation deceleration mechanism, which poses an unfavorable problem in terms of work safety when the manual handle is rotated at high speed.

It is an object of the present invention to provide a mechanism that prevents unexpected rotation of the manual handle and avoids damage to the swing deceleration mechanism due to overtorque by a simple modification of the swing deceleration mechanism. .

[Means for solving problems]

The characteristic configuration of the present invention is that a worm deceleration mechanism is provided in the turning drive section of the traversing screw conveyor, the worm is attached to a rotating shaft rotated by the manual handle, and a thrust force is applied to the worm. An axial position regulating means is provided that allows the worm to move in the axial direction relative to the rotating shaft only when the worm reaches a certain level or more, and its effects are as follows.

[Effect]

In other words, by only partially modifying the rotation drive mechanism by installing a worm reducer with a self-locking function in the rotation drive section from the meshing structure, it is possible to prevent the accidental operation of the cross-feeding screw conveyor and, by extension, the accidental rotation of the manual handle. .

Moreover, if the position regulating means applies a thrust force to the worm that is less than a set value for turning the lateral screw conveyor by operating the manual handle, the worm performs the normal transmission operation and performs maintenance. When a worker unexpectedly and collides with the horizontal screw conveyor during work, etc., and the horizontal screw conveyor is suddenly rotated, a thrust force that exceeds the set value is applied to the worm. In this case, the worm can overcome the regulating force of the position regulating means and move in the axial direction, thereby avoiding damage to the worm itself.

Therefore, by effectively utilizing the self-locking performance of the worm reducer, there is no need for a braking mechanism such as a brake mechanism in addition to the transmission mechanism, and a position regulating means is added to solve the overload problem that cannot be avoided due to its self-locking performance. By configuring this structure, damage due to overload can be prevented without impairing the transmission performance.

[Effect of idea]

As a result, it is possible to prevent a decrease in work safety due to unexpected actuation of the manual handle, and it is also possible to extend the life of the transmission mechanism.

〔Example〕

As shown in Fig. 6, the front part of the machine includes a pre-harvesting treatment device 1, a device 2 for threshing the grain culms that are harvested and transported by the pre-harvesting treatment device 1, and an exhaust system for processing the threshed waste straw from the threshing device 2. A straw processing device 3, a driver's seat 4 on the side of the pre-harvesting treatment device 1, a grain tank 5 for storing threshed grains behind the driver's seat, and a bottom screw provided at the bottom of the grain tank 5. A vertical screw conveyor 7 carries the grains transferred to the discharge port by the conveyor 6 to the outside of the machine.
A combine harvester is provided with a transverse screw conveyor 8 which is pivotally connected around the periphery so as to be able to swing vertically.

As shown in FIGS. 1 and 3, a cylindrical bracket 9 is externally fitted onto the upper end of the vertical screw conveyor 7 so as to be rotatable around the cylinder axis P, and a horizontal screw conveyor is attached to this bracket 9. The proximal end portions of 8 and 9 are integrally fixed, and both 8 and 9 are configured to be able to rotate together. A ring-shaped worm wheel 10 is provided on the bracket 9, a worm 12 is provided on the machine frame 11 side extending from the thresher 2 side, and a worm deceleration mechanism 14 for rotating the lateral screw conveyor 8 is provided. is spline-fitted to the first rotating shaft 15 so as to be slidable in the axial direction, and the manual handle 1 near the driver's seat 4 is connected via the bevel gear 16 and the first rotating shaft 17 to the first rotating shaft 15 .
8 and is configured so that it can be controlled remotely from the driver's seat.

As shown in FIG. 2, a pair of springs 19, 19 are provided on the worm 12 to elastically press the worm 12 to a certain position in the axial direction with a certain initial pressure in the forward and reverse directions. , is configured as an axial position regulating means that allows the worm 12 to move in the axial direction with respect to the first rotating shaft 15 only when the thrust force acting on the worm 12 exceeds a certain level.

Therefore, the thrust force above a certain level that acts on the worm 12 when the traverse screw conveyor 8 is forcibly rotated from the outside at a speed higher than the rated rotational speed is absorbed by sliding retraction. You can avoid damage to yourself.

[Another example]

As shown in FIG. 4, the connecting pin 2 breaks when the thrust force acting on the worm 12 between the worm 12 and the first rotating shaft 15 exceeds a certain level.
0 may be provided as a position regulating means.

As shown in FIG. 5, a spring ball type coupling mechanism 2 is provided between the worm 12 and the first rotating shaft 15.
1 may be provided as a position regulating means in which the worm 12 slides when a thrust force of a certain level or more is applied.

[Brief explanation of the drawing]

The drawings show an embodiment of the grain delivery device for a combine harvester according to the present invention, in which Fig. 1 is a plan view of the swing drive mechanism, Fig. 2 is a plan view showing the worm deceleration mechanism, and Fig. 3 is a plan view showing the vertical screw conveyor. FIG. 4 is a side view showing the connection point with the lateral screw conveyor; FIG. 4 is a plan view showing another embodiment of the position regulating means; FIG. 5 is a transverse plan view showing another embodiment of the position regulating means; FIG. is a side view of the combine harvester. 5...Grain tank, 7...Vertical screw conveyor, 8...Horizontal screw conveyor, 12...
Worm, 14... Worm reduction mechanism, 15...
Rotating shaft, 18...manual handle, 19...spring.

Claims (1)

[Claims for Utility Model Registration] A horizontal screw conveyor 8 is rotatably attached to the upper end of the vertical screw conveyor 7 connected to the grain tank 5, and a manual handle 1
8, there is provided a grain delivery device for a combine harvester in which a cross-feeding screw conveyor 8 is configured to be able to be rotated;
A worm reduction mechanism 14 is provided in the swing drive section of the
The worm 12 is attached to the rotating shaft 15 which is rotated by the manual handle 18, and the worm 12 is rotated relative to the rotating shaft 15 only when the thrust force acting on the worm 12 exceeds a certain level. A grain unloading device for a combine harvester, which is provided with an axial position regulating means for allowing movement in the grain direction. The axial position regulating means of the worm 12 is configured to elastically press the worm 12 to a fixed position in the axial direction from forward and reverse directions with an initial pressure by a pair of springs 19, 19.Registered utility model. A grain delivery device according to claim 1.