JPH0137409Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing clogging of a discharge thrower in a grain tank. In a type of combine harvester in which grains such as paddy in a grain tank are transferred directly to a truck or the like without being bagged, a spiral body is generally placed horizontally in the lower part of the tank, and the paddy transferred horizontally by the spiral body is transferred to one side of the tank. Many of the machines are constructed so that the grain is transferred to a truck or the like outside the machine using the discharge force of the discharge thrower installed at the machine.

By the way, as shown in Fig. 7, the discharge force of the thrower is determined by the jumping force of the blade A + the motive force, but due to a temporary decrease in engine torque during work, the rotational speed of the blade A decreases and the discharge force decreases. In the case of wet material that easily sticks to various parts, all of the paddy that is thrown up is not blown to the outside of the thrower tube, and some of the paddy is thrown onto the bottom surface of the thrower tube at the tip as shown by arrow a. I end up falling. If this fallen paddy flows down along the inner surface of the cylinder to the part of the blade A, it will be discharged again, so there is not much of a problem. When the wind power is balanced, the paddy may remain stationary in that position. In this way, once the paddy accumulates in the barrel, subsequent grains of rice tend to get caught in the area, and eventually the barrel gets clogged, forcing the interruption of work. To deal with this paddy clogging, conventional models equipped with a sensor that detects paddy clogging in the thrower tube are available, but these devices only detect paddy clogging, and once the paddy clog occurs, the work is carried out at the thrower each time. After the clutch of the spiral body at the bottom of the tank is released, it is necessary to insert your hand through a cleaning port (not shown) provided in the thrower to scrape out the paddy inside the thrower to clear the paddy clogging, and the subsequent processing is troublesome and often There was a drawback that it took a lot of time. It has also been considered to automatically disengage clutches such as throwers when paddy is clogged, but this does not solve the above-mentioned drawbacks since the clogged paddy must be raked out by hand. It is.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to mount a shutter that can be opened and closed above the spiral body provided at the bottom of the tank to block the inflow of grains into the spiral body. In addition, a valve is provided at the bottom of the thrower cylinder that opens at the initial stage of clogging when grains begin to accumulate, and the shutter is configured to close in conjunction with the opening of this valve. Even if the grains try to clog inside the thrower cylinder, this clogging can be prevented, and the trouble of releasing the clutch of the thrower etc. and scraping out the clogged grains by hand each time as in the conventional case can be eliminated. It is an object of the present invention to provide a device for preventing clogging of a discharge thrower in a grain tank, which enables efficient work at all times.

The structure of the present invention will be explained with reference to an embodiment shown in the drawings. 1 is a paddy tank of a combine harvester in which the paddy discharge port 2' of the grain lifting cylinder 2 faces the inside upper part; It is located on the side of the threshing section 4 and is mounted on the machine body. 5 is a thrower for discharging paddy,
The side of the fan case 5' in which the blades 6 are installed is rotatably connected to the paddy tank 1 via a metal 7 fixed to the front plate 1' of the paddy tank 1.

Reference numeral 8 denotes a spiral body for transferring paddy, and this spiral body 8 is horizontally suspended concentrically with the metal 7 at the inner bottom of the paddy tank 1 via bearings 9 and 9', and one end is inserted into the fan case 5'. The blade 6 is fixed to the extending end. And the power is engine 10
From the tension clutch 11' as shown in FIG.
The spiral body 8 is transmitted to the transmission belt 13 via the transmission belt 11 equipped with
It is designed to rotate.

14 is a hinge-type shutter mounted directly above the spiral body 8 so as to be openable and closable. 14' is the shutter 1
4, and its both ends are inserted into guide holes 15, 15 provided in the front side plate 1' and rear side plate 1'' of the paddy tank 1 so as to be able to move up and down within a predetermined range.16,1
Reference numeral 6' denotes a pair of front and rear link arms, and the base ends of the pair of link arms 16, 16' are integrally connected to a shaft 16a rotatably supported between the front and rear side plates 1', 1'' of the paddy tank 1. and the tips thereof are pivotally connected to the fulcrum shaft 14 of the shutter 14 through elongated holes a. Reference numeral 17 designates a solenoid fixed to the lower part of the tank rear side plate 1'', and its operating rod 17 ' is pivotally connected to the link arm 16.
Reference numeral b denotes a tension spring stretched between the link arm 16 and the tank rear side plate 1'', and the link arms 16, 16' are always urged upward by this spring b.

18 is an inverted V-shaped shutter cover fixed above the shutter 14, and 19, 19 are shutter guides.

20 is a valve provided at the lower part of the thrower cylinder 5'' in the thrower 5 for discharging paddy, and this valve 20 is used to prevent grains from accumulating in the thrower cylinder 5'' and the static pressure inside the thrower cylinder 5'' increasing. The valve 20 is automatically opened to allow the air inside the thrower cylinder 5'' to escape to the outside of the cylinder 5'' (see Figure 2). 'The one installed on the front side is shown. 21 is a pivot point for the valve 20, and 22 is a toggle spring, which holds the valve 20 in an open or closed state by passing over the fulcrum, and its spring pressure is set to be very weak. It can be opened and closed with a small amount of force.

A limit switch 23 is attached to a plate 24 fixed to the thrower cylinder 5''.The limit switch 23 is connected to the solenoid 17 as shown in FIG. is turned ON, the solenoid 17 is shortened, and the shutter 14 is automatically closed. In the figure, 25 is a container for receiving the scattered particles when the valve 20 is opened.

Next, the operation of the present invention will be explained. During operation, the paddy threshed by the threshing section 4 is stored in the paddy tank 1 via the grain lifting cylinder 2. During this work, the valve 20 is closed as shown by the solid line in Figure 2, so the limit switch 23 is OFF and the solenoid 1
7 is not energized and therefore link arm 1
6 and 16' are pulled upward by the spring b, so that the shutter 14 is housed in the shutter cover 18 and held open as shown by the solid line in FIG. In this state, the load of paddy in the paddy tank is not directly applied to the shutter 14 because the shutter cover 18 receives it.

Now, when the paddy tank 1 becomes full, the operation is temporarily interrupted and the paddy in the tank 1 is discharged and transferred to a truck or the like. At this time, adjust the rotation of the thrower 5 so that the discharge tube tip of the thrower tube 5'' matches the truck loading platform,
When the tension clutch 11' is engaged and the spiral body 8 and the blades 6 are rotated, the paddy in the tank 1 is laterally transferred by the spiral body 8 and sequentially supplied to the fan case 5' side, and the rice grains are transferred to the thrower tube 5 by the blades 6. '' and are thrown into a truck, etc.

By the way, if the output of the engine 10 temporarily decreases for some reason and the rotational speed of the blade 6 decreases, or in the case of wet material, the paddy discharging capacity will decrease as described above, and some of the paddy will fall to the tip of the pipe. The paddy falls and accumulates on the bottom surface of the cylinder, which causes clogging, but when paddy accumulates in the thrower 5'', the static pressure inside the cylinder 5'' increases, and this pressure causes the valve to close. 20 opens against the toggle spring 22 as shown by the phantom line in FIG.
16 and the fifth through the shutter guides 19, 19.
It is closed as shown by the phantom line in the figure. At this time, the spiral body 8 and the blades 6 are still being driven, and when the valve 20 is opened, the wind escapes from this opening, and the thrower cylinder 5''
As the wind force inside decreases, the balance of the accumulated paddy is disrupted, and the accumulated paddy naturally flows down along the lower surface of the cylinder 5'' due to its own weight and vibration of the machine, and reaches the blade 6, where it is thrown up again. At this time, since the valve 20 is open, the wind force is weak and the discharging capacity of the blades 6 is reduced.Although the helical body 8 is rotating, it is discharged little by little due to the splashing force. Since the shutter 14 provided above 8 is closed, no more paddy is supplied to the fan case 5' side.
The paddy inside the thrower tube 5'' will be completely discharged after some time without clogging the fan case 5' etc. due to insufficient capacity. Since it is provided above the spiral body 8 rather than on the communication port side, the continuation of rotation of the spiral body 8 when the shutter 14 is closed will have an adverse effect on the grains at the bottom of the paddy tank and the grains in the fan case (due to forced spiral transfer). Damage to grains, etc.) is prevented.The operator only has to close the valve 20 and continue the work again, after noticing that the paddy in the tube 5'' has run out or has decreased. In addition, the thrower tube 5″
If the tube is completely clogged with paddy, the paddy will be bridging inside the tube 5'', and in this state, even if the valve 20 is opened, the paddy will not flow down, but the spring pressure of the toggle spring 22 is set in advance to be very weak. Therefore, in the present invention, the valve 20 is opened at the initial stage of paddy clogging when paddy starts to accumulate (when the static pressure inside the cylinder 5'' has increased slightly), so that the paddy clogging can be eliminated before it occurs. be.

As described above, the present invention has a spiral body suspended horizontally at the inner bottom of the grain tank, and the grains transferred laterally by the spiral body are discharged to the outside of the machine by a discharge thrower. In addition to being equipped with a shutter that can be opened and closed to block the inflow of grains into the helix, the lower part of the thrower cylinder in the discharge thrower is automatically activated when grains accumulate in the thrower cylinder and the static pressure inside the thrower cylinder increases. A valve that opens automatically is provided, and in response to the opening of the valve, the shutter closes and is linked to block the inflow of grains into the spiral body, so when the material is a so-called wet material with a lot of moisture adhering to it. etc., even if the paddy is once stationary and accumulated in the thrower cylinder in balance with the wind force, the reduction in the force of force in the cylinder due to the opening of the valve destroys the balancing effect of the accumulated paddy, allowing it to flow down the cylinder and be discharged again.

In addition, by opening the valve at the initial stage of paddy clogging when paddy begins to accumulate, it is possible to prevent paddy clogging, and each time it occurs, the clutch can be disconnected or the clogged paddy can be raked out by hand. Naturally (automatically)
It is possible to return to proper grain ejection at the same time, which eliminates wasted time required for post-processing of paddy clog, allowing for efficient work at all times.Furthermore, when the shutter is closed, the grain is discharged to the helix side. Since the inflow of grains is blocked, even if the spiral body does not have to be stopped each time, excessive pressing force will not be applied to the grains at the bottom of the grain tank or the grains in the fan case, resulting in damage to the grains. There are effects such as being able to automatically resolve paddy clogging at an early stage when grains begin to accumulate in the thrower cylinder without being forced to interrupt work.

[Brief explanation of the drawing]

Figure 1 is an overall perspective view of a combine equipped with the present invention, Figure 2 is a partially cutaway vertical sectional view of the main parts, Figure 3 is an overall perspective view of the shutter, Figure 4 is a rear view of the paddy tank, and Figure 4 is a rear view of the paddy tank. FIG. 5 is an explanatory diagram of the operation of the shutter, FIG. 6 is an electric circuit diagram of the solenoid, and FIG. 7 is an explanatory diagram of the operation of a conventional thrower. In the figure, 1 is a paddy tank, 5 is a thrower for discharging paddy,
5″ is the thrower cylinder, 8 is the spiral body, 14 is the shutter,
20 is a valve.

Claims (1)

[Scope of utility model registration request] A spiral body is installed horizontally at the bottom of the grain tank, and the grains transferred laterally by the spiral body are discharged to the outside of the machine by a discharge thrower, in which the grains are blocked from flowing into the spiral body above the spiral body. In addition to installing a shutter that can be opened and closed freely, a valve is installed at the bottom of the thrower cylinder in the discharge thrower that automatically opens when grains accumulate in the thrower cylinder and the static pressure inside the thrower cylinder increases. . A device for preventing clogging of a discharge thrower in a grain tank, characterized in that the shutter closes in response to the opening operation of the valve to block the flow of grains into the spiral body.