JP3210651B2 - Drive structure of rotary screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary screen drive structure for cleaning air sent to a radiator.

[0002]

2. Description of the Related Art In recent years, a rotary screen B mounted on an ordinary combine has the structure shown in FIGS.

[0003] As shown in the figure, a rotary cylinder 101 having a filter screen 100 formed of a mesh attached to the front surface is mounted on a screen mounting shaft 102 penetrating the rotary cylinder 101. Are rotatably supported by bearings 103 and 104.

Further, on the outer surface of the filter screen 100, a dust suction duct 105 for sucking and removing dust attached to the outer surface of the filter screen 100 in a fixed state is arranged.

Further, as a driving structure of the rotary screen B, a driving roller 106 is disposed outside the rotary cylinder 101 at a parallel interval, and a V belt or the like is provided between the rotary cylinder 101 and the drive roller 106. A drive belt 107 is wound around the drive belt 106, and the drive roller 106 is connected to a rotating motor (not shown).

With this configuration, the air fed to the radiator can be cleaned through the rotating filter screen 100, and the dust adhering to the filter screen 100 is sucked by the dust suction duct 105 to remove the dust. 100 and can be discharged outside.

[0007]

However, the driving structure of the rotary screen B has the following problems.

That is, as shown in FIGS. 5 and 6, the rotation of the rotary screen B is performed by rotating the rotating cylinder 101 made of a mesh.
Therefore, the rotating cylinder 101 must be provided with sufficient rigidity, so that the rotating cylinder 101 is heavy.

When a V-belt with less slippage is used as the drive belt 107, there is no expansion and contraction, so that tension is not applied, and the roundness of the rotary cylinder 101 is strictly required. Needed to be built precisely.

Further, in order to obtain a low speed, the rotating cylinder 10
It is desirable to make the diameter of the driving roller 106 as small as possible, but there is a limit to reducing the diameter of the driving roller 106 from the viewpoint of preventing the driving belt 107 from slipping. On the other hand, in order to make the entire configuration of the rotary screen B compact, it is desirable to bring the drive roller 106 as close to the rotary cylinder 101 as possible. In this case, the drive belt 107 is wound around the drive roller 106. Since the hanging ratio is reduced, there is a limit in reducing the distance between the rotary cylinder 101 and the driving roller 106.

An object of the present invention is to provide a drive structure for a rotary screen that can solve the above-mentioned problems.

[0012]

According to the present invention, there are provided a) a rotary cylinder having a circular filter screen attached to one end face thereof for removing dust from the air flowing in from the outside; and b) a circumference of the rotary cylinder. A driving roller and a driven roller disposed in opposition to the inside and outside of the wall portion; and c) a base end rotatably supported by a support shaft disposed near the peripheral wall portion, and a driving roller at the tip end. And a roller support arm having a driven roller and a driven roller rotatably mounted thereon.

Further, the present invention is characterized in that there is provided an urging means for urging both roller support arms toward the peripheral wall portion and enabling the peripheral wall portion to be narrowed by the driving roller and the driven roller. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows a general-purpose combine C, in which a threshing device 3 and a rocking device 4 are provided on a body 1 driven by a crawler 2, and a reaper 5 is provided in front of the body 1 by hydraulic pressure. A grain tank 7 for storing the grains threshed by the threshing device 3 is disposed beside the threshing device 3 while supporting the ascent and descent via an elevating device 6, and in front of the grain tank 7. A driver's seat 8 and a driving operation unit 9 are provided.

A motor 10 is disposed behind the Glen tank 7 as shown in FIGS.
A radiator fan 11a is mounted on the outside of the side of the radiator 10, and the radiator 11 is disposed at a position near the radiator fan 11a. In the drawing, reference numeral 13 denotes a discharge unit provided at the rear of the threshing device 3.

The reaper 5 includes a cereal header 21 for taking in uncut culm, a reciprocally driven cutting blade 22 mounted between the cereal headers 21, a culm raking drum 23 and the cereal header 21. It comprises a transport section 24 having a conveyor 25 for transporting the grain stalks cut by the cutting blade 22 to the threshing apparatus 3 and a grain scraping reel 26 supported by the grain header 21.

In the figure, reference numeral 27 denotes an air cleaner of the prime mover 10, and a part of clean air from a clean air supply duct 35 to be described later flows into the air cleaner 27.

Thus, the present invention relates to a rotary screen A provided along the side wall of the box-shaped cover 30 of the threshing apparatus 3 in order to send clean air to the radiator fan 11a in the general-purpose combine C described above. Has features.

That is, as shown in FIGS. 1 and 2, a diamond-shaped cooling air inlet 31 is provided on the side wall of the box-shaped cover 30, and the inlet 31 is provided with a punched metal or a coarse metal mesh. A dustproof body 32 made of the same is detachably attached.

As shown in FIG. 3, a rotary screen installation space 33 provided at the rear of the cooling air intake 31 and a front portion of the radiator 11 are provided inside the side wall of the box-shaped cover 30, as shown in FIG. A clean air supply duct 35 communicating with the provided clean air inflow space 34 is provided.

As shown in FIGS. 2 and 3, a large-diameter ring in which a circular filter screen 40 for removing dust from the air flowing in from the outside is attached to one end face in a rotary screen installation space 33. A rotating cylindrical body 41 is rotatably arranged.

In the rotary cylinder 41, the center of the filter screen 40 is connected to a cylinder support shaft 43 via a mounting plate 42.
The cylindrical support shaft 43 has one end rotatably supported by a bearing 44 provided at the center of the dustproof body 32, and the other end rotatably supported by the side wall frame 3b of the threshing device 3.
And is rotatably supported by a bearing 45 provided on the horizontal frame 3c.

With this configuration, the rotary cylinder 41 can be rotatably arranged in the rotary screen installation space 33. In FIG. 3, reference numeral 41b denotes an outer space of the combine C in the rotary screen installation space 33.
An annular seal for preventing external air from flowing through the outer peripheral surface of the rotary cylinder 41.

Next, a driving mechanism for driving the rotary cylinder 41 will be described. As shown in FIGS. 2 and 3, a small-diameter wall member 41a is opposed to the inside and outside of a peripheral wall portion 41a below the rotary cylinder 41. And a driven roller 47 are disposed.

Each of the rollers 46, 47 has a rubber ring 46a, 47a mounted on its peripheral surface.
One peripheral wall portion 41a of the rotary cylinder 41 is sandwiched between 46a and 47a.

In the above-mentioned rotary cylinder 41, a portion located near the drive roller 46 is provided with an arm support shaft 48.
Is protruded from the horizontal frame 3c, and the arm support shaft 48 is provided with the base ends of a pair of roller support arms 49 and 50.
Each is independently and rotatably fitted.

Roller mounting shafts 46b, 47b to which a driving roller 46 and a driven roller 47 are fixed are rotatably supported at the ends of the roller supporting arms 49, 50, respectively.

A tension coil spring 51 as an urging means is interposed between the intermediate portion of the roller support arm 49 and one end of the horizontal frame 3c. Thus, it can be pressed against the inner surface of the peripheral wall portion 41a of the rotary cylinder 41.

On the other hand, the rear extension end 50 of the roller support arm 50
A tension coil spring 52 as an urging means is interposed between a and one end of the horizontal frame 3c, and the spring 52 elastically causes the driven roller 47 to resiliently rotate the peripheral wall portion 41a of the rotary cylinder 41.
Can be pressed.

Accordingly, the peripheral wall portion 41a of the rotary cylinder 41 can be pinched by the driving roller 46 and the driven roller 47 with a sufficient pinching force without deformation of the portion.

The imbalance of the holding force or the pressing force of the rollers 46, 47 is determined by the tension coil springs 51, 52, respectively.
The adjustment can be easily performed by operating the adjustment screws 53 and 54 provided continuously to the motor.

As is apparent from FIG. 4, a worm wheel 46c is mounted on the roller mounting shaft 46b of the drive roller 46, and the worm wheel 46c is mounted on the roller support arm 49 by the drive roller 46. The worm screw 61 attached to the output shaft of the electric motor 60 attached at the separated position meshes.

With this configuration, when the electric motor 60 is driven to rotate its output shaft, the rotational force is transmitted to the roller mounting shaft via the worm screw 61 and the worm wheel 46c.
The drive roller 46 is transmitted to the drive roller 46b and can rotate the drive roller 46 at a large reduction ratio.

The driving roller 46 is sandwiched in a pressed state by the peripheral wall portion 41a of the rotating cylinder 41 in cooperation with the driven roller 47, so that there is sufficient space between the driving roller 46 and the rotating cylinder 41. Friction force is generated. Therefore, the rotation of the driving roller 46 can be reliably transmitted to the rotating cylinder 41, and the rotating cylinder 41 can be surely rotated.

Further, the diameter of the driving roller 46 is
Since the diameter of the rotating cylinder 41 is sufficiently small with respect to the diameter of the rotating cylinder 41, the rotating cylinder 41 can be rotated at an extremely low speed in order to secure a sufficient speed reduction ratio also in this case and to enable the suction of dust described later.

Next, it is provided on the front surface of the rotary cylinder 41 described above,
A dust discharging mechanism for sucking dust attached to the front surface and removing the dust to the outside will be described.

As shown in FIGS. 2 and 3, a duct supporting horizontal frame 70 is provided on the front surface of the rotary cylinder 41, and both ends of the frame 70 are fixed to the side wall of the box-shaped cover 30. ing.

On the other hand, a rotating cylinder
A dust suction duct 71 having a start end in the center of the filter screen 40 of 41 and extending the end to one end of the frame 70 is provided, and the end of the dust suction duct 71 is
The dust communication duct 73 is connected to the start end of the dust communication duct 73 through the connection tube 72, and the end of the dust communication duct 73 communicates with the front space 74 formed between the radiator 11 and the radiator fan 11a.

Next, the operation of the rotary screen A having the above configuration will be described with reference to FIGS.

When the prime mover 10 is driven, the radiator fan 11a integrally mounted on the prime mover 10 rotates to generate a negative pressure in the front space 74 of the radiator fan 11a. As a result, as shown in FIGS. 1 and 3, the filter screen 40 of the rotary screen A is used as one air flow.
External air first flows into the rotary cylinder 41 through the rotary cylinder 41.
Such inflow air is clean air from which dust in the external air has been removed, and the clean air then flows into a clean air inflow space 34 provided in the front of the radiator 11 through a clean air supply duct 35, Thereafter, after being used as cooling air for the radiator 11, it is also used for cooling the prime mover 10 through the front space 74.

On the other hand, when a negative pressure is generated in the front space 74 by driving the radiator fan 11a, a negative pressure is generated in the dust suction duct 71 through the dust communication duct 73 to generate a second air flow. Will be. That is, part of the air that has flowed into the rotary cylinder 41 passes through the filter screen 40 of the rotary screen A in the reverse direction and is sucked into the dust suction duct 71, and adheres to the surface of the filter screen 40 during this suction. Garbage can be removed.

By the way, at the same time when the prime mover 10 is driven, the filter screen 40 is rotated by the electric motor 60 to rotate the rotary cylinder 41.
It is rotated at a low speed with
Inside, the dust attached to the surface of the filter screen 40 can be continuously removed by using the suction area of the duct 71 as a unit, and the external air is always clogged and kept within the rotary cylinder 41 within the clogged state. It becomes possible to make it flow.

The air that has flowed into the dust suction duct 71 and mixed with dust flows into the front space 74 that forms the rear of the radiator 11 through the dust communication duct 73, and flows into the front space 74 through the radiator 11. After merging with cooling air,
It will be used as cooling air for the prime mover 10.

[0045]

(1) According to the first aspect of the present invention, the rotary screen driving structure includes: (a) a rotary cylindrical body having a circular filter screen attached to one end face for removing dust from air flowing in from the outside; B) a driving roller and a driven roller disposed in opposition to the inside and outside of the one peripheral wall portion of the rotating cylinder;
C) a roller support arm having a base end rotatably supported by a support shaft arranged near the peripheral wall portion and a drive support and a driven roller rotatably mounted at the tip end; It has a configuration.

Accordingly, the following effects are obtained.

Since the outer peripheral portion of the rotary cylinder is directly driven by the drive roller, it can be driven with low torque.

The rotational torque of the drive roller can be transmitted quietly and reliably to the rotary cylinder, that is, the rotary screen.

When an electric motor is used as a drive source, a rotary screen can be installed at any position.

Since the drive mechanism can be stored substantially compactly inside the rotary cylinder, the rotary screen can be installed at any location from this aspect.

(2) According to the second aspect of the present invention, there is provided an urging means for urging both roller support arms toward the peripheral wall portion, and enabling the peripheral wall portion to be narrowed by the driving roller and the driven roller. ing.

Therefore, the driving roller and the driven roller always hold the rotary cylinder in a pressed state by the urging means.
The rotation of the drive roller makes it possible to reliably rotate the rotary cylinder, that is, the rotary screen.

[Brief description of the drawings]

FIG. 1 is an overall front view of a combine having a rotary screen driving structure according to the present invention.

FIG. 2 is an enlarged front view of the rotary screen.

FIG. 3 is a cross-sectional plan view of a main part of the rotary screen taken along line II of FIG. 1;

FIG. 4 is an enlarged explanatory view of a drive mechanism of a drive pulley.

FIG. 5 is a perspective view of a conventional rotary screen driving structure.

FIG. 6 is a sectional side view of the same.

[Explanation of symbols]

 40 Filter screen 41 Rotating cylinder 41a Peripheral wall 46 Drive roller 46a Rubber ring 47 Followed roller 49 Roller support arm 50 Roller support arm

Claims (2)

(57) [Claims] 1. A rotary cylinder (41) having a filter screen (40) attached to one end face for removing dust from the air flowing from the outside, and (b) a peripheral wall of the rotary cylinder (41). (C) a drive roller (46) and a driven roller (47) disposed in opposition to the inside and outside of the portion (41a); c) an arm support shaft (48) having a base end disposed near the peripheral wall portion (41a) And a roller support arm (49) (50) to which the driving roller (46) and the driven roller (47) are rotatably mounted at the tip. Drive structure of rotary screen. 2. A rotary cylinder body for both roller support arms (49) and (50).
(41) and urge the peripheral wall portion (41a) of the drive roller (46).
A biasing means (51) (52) which makes it possible to narrow the peripheral wall portion (41a) with the driven roller (47) and the driven roller (47).
The drive structure of the rotary screen as described.