JPS6236898B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a granular material transport vehicle that transports and discharges granular materials such as feed.

Generally, powder and granule transport vehicles sometimes carry different types of powder and granules (for example, chicken feed and pig feed).
When one powder or granule is discharged, the powder or granule remaining in the discharge tube is mixed with one powder to prevent it from scattering on the road, and when the other powder or granule is discharged. In order to prevent this, it is necessary to collect the powder remaining in the discharge path in the discharge tube and the conveyance tube.

By the way, a method described in Japanese Patent Publication No. 48-31189 is known as a device for controlling the discharge of powder and granules during the transportation of powder and granules. Since it was not possible to collect the bodies, only a single type of feed was transported and discharged, creating the inconvenience of having to return to the base and transfer the feed each time a different feed was used.

There are also powder and granule transport vehicles that can collect powder and granules remaining in the discharge route, but they are equipped with hydraulic motor switching valves for each hydraulic motor, making operation complicated. Not only that, but it also led to an increase in cost and there was a fear of such manipulation.

The present invention has been made in view of the above points, and by switching a single hydraulic motor switching valve, all the screws are driven in normal rotation to discharge the powder and granules in the storage tank to a silo or the like. An object of the present invention is to provide a discharge control device for a powder transport vehicle, which is capable of recovering powder and granules remaining in a discharge path by reversing each screw except the bottom screw.

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

FIG. 1 shows an example of a powder transport vehicle 1 equipped with a control device of the present invention, and a powder storage tank 3 is mounted on a vehicle frame 2 of the vehicle. The inside of this tank is compartmentalized, and a powder loading port is provided at the top of each compartment, and a closable delivery port is provided at the bottom of the narrowed hem. A powder and granular material conveyance device consisting of a plurality of conveyance means, for example, a screw conveyor type conveyance means, is provided. This conveyance means includes a horizontal bottom screw 4 connected to the outlet at the bottom of the tank, a vertical bottom screw 5 that conveys upward from the end on the outlet side, and a boom-shaped tip extending from the end that conveys the conveyance toward the outlet. and a discharge screw 6. The discharge screw 6 is attached with a hydraulic cylinder 7 for controlling the height of its discharge port (see also FIG. 2).

Hydraulic motors B, shown in FIG.
Connect V and D. It is assumed that these hydraulic motors can be switched from normal rotation to reverse rotation by reversing the flow direction of the flowing pressure oil.

The control device of the present invention is shown in FIG. 2 as hydraulic lines for these hydraulic motors B, V and D, and the control line for the hydraulic cylinder 7 is also shown here.

In FIG. 2, an oil pump 8 is driven by, for example, a prime mover of a transport vehicle, and sucks oil from an oil reservoir 9 through a strainer 10 and sends pressure oil through a pressure oil main pipe 11 to a switching valve box 12. Oil from the valve box 12 An oil return pipe 13 from the valve box 12 is led to the oil reservoir 9. A circulation pipe 15 having a relief valve 14 between the pressure oil main pipe 12 and the return pipe 13 within the valve box 12.
Connect. Inside the valve box 12, there are provided a 3-position switching valve 16 for the hydraulic cylinder 7 (left, center, right) and a similar 3-position switching valve 17 for the hydraulic motors B, V, and D. communication and interruption. The pressure oil main pipe 11, the pressure oil auxiliary pipe 19 that branches off from it and passes through the check valve 18, and the branch pipe 20 of the return pipe 13 are connected to the hydraulic cylinder switching valve 16.
lead to the first, second, and third ports of. A first port, a second port and a third port on the opposite side of the switching valve 16 are connected to the first port of the hydraulic motor switching valve 17 via a pressure oil transfer pipe 21, respectively, and are connected to the first port of the hydraulic motor switching valve 17 via a pipe 23 having a throttle valve 22 for hydraulic pressure. to cylinder 7 and branch pipe 2 of return pipe 13
Connected to 4. The second of the hydraulic motor switching valve 17
A pressure oil transfer sub pipe 25 branched from the pressure oil transfer pipe 21 and a branch pipe 26 of the return pipe 13 are led to the port and the third port. The second port on the opposite side of the hydraulic motor switching valve 17 is led to the forward rotation side port of the discharge screw hydraulic motor D through the conduit 27, and the reverse rotation side port is connected to the conduit 2.
8 to the normal rotation side port of the vertical screw hydraulic motor V, and its reverse rotation side port is guided to the normal rotation side port of the bottom screw hydraulic motor B via the conduit 29.
The reverse side port is led to the third port on the opposite side of the hydraulic motor switching valve 17 via the return pipe 30. This switching valve 17
The first port on the opposite side is connected to the hydraulic motor V through the main pipe 31.
It is connected to the conduit 29 between B. Also, this main pipe 31
A depressurization pipe 33 having a relief valve 32 is connected to the return pipe 13 .

The apparatus according to the embodiment of the present invention having the above configuration is controlled and operated as follows. Although the hydraulic cylinder 7 and its switching valve 16 do not constitute the subject matter of the present invention, the left position of the switching valve 16 is for extending the cylinder 7, the neutral position is for maintaining a neutral stop, and the right position is for shortening the cylinder 7. be. The switching valve 16 is normally operated by the springs 3 on both sides.
4, the pressure oil is held at the center position shown in FIG.
However, at the left and right positions, the first port path is blocked and pressure oil does not enter the transfer pipe 21, so the three hydraulic motors do not operate. Hydraulic motor D,
Regarding the V and B switching valves 17, the left position is for forward rotation;
The center position is for stopping, and the right position is for reversing. As described above, when the hydraulic cylinder switching valve 16 is in the neutral state and pressure oil is being supplied to the transfer pipe 21, when the switching valve 17 is switched to the left position, the first port path is cut off, but the pressure The oil is first introduced into the discharge screw hydraulic motor D through the sub-transfer pipe 25, the second port path (high pressure side port) of the switching valve 17, and the conduit 27. The pressure oil then passes through a vertical screw hydraulic motor V through a conduit 28, and then through a conduit 29.
It passes through the bottom screw hydraulic motor B,
Thereafter, it returns to the oil reservoir via the return pipe 30, the third port path (low pressure side port) of the switching valve 17, the branch pipe 20, and the return pipe 13. Thus, hydraulic motor D, hydraulic motor V, and hydraulic motor B are started in this order and rotate normally.

Therefore, the discharge screw 6 is started before the powder or granular material is sent from the vertical screw 5, and the vertical screw 5 is started before the powder or granular material is sent from the bottom screw 4, so that they are started with no load. Since these screws are already rotating when the powder is fed in, the powder can be transferred smoothly under dynamic friction. When the hydraulic motor switching valve 17 is switched to the neutral position, the oil sent into the transfer pipe 21 is transferred to the secondary transfer pipe 25, the second port of the switching valve 17, the short path 35 from the second port to the third port, Branch pipe 2 leading to the third port
6. Since the powder flows in a short route through the return pipe 13 and no pressure is applied, the hydraulic motors D, V, and B stop, and the powder and granules are not transported. When the hydraulic motor switching valve 17 is switched to the right position, the pressure oil in the transfer pipe 21 is transferred to the first port path (high pressure side port) of the switching valve 17,
It is introduced into the hydraulic motor V via the main pipe 31 and the conduit 29, then passes through the hydraulic motor D in the opposite direction, and then passes through the conduit 27 and the path from the second port (low pressure side port) on the opposite side of the switching valve 17 to the third port. , branch pipe 26 and return pipe 13 to return to the oil reservoir 9. Therefore, as these hydraulic motors V and D are reversed, the vertical screw 5 and the discharge screw 6 are reversed, and the residual powder in the conveyance path is collected up to the bottom end of the vertical screw, where it is collected. taken from.
During this time, the oil in the return pipe 30 is blocked from the return side by the third port on the opposite side of the switching valve 17, so the pressure oil in the conduit 29 cannot pass through the hydraulic motor B, and the hydraulic motor B cannot rotate. The bottom screw 4 is now stopped. In addition, when transporting powder and granular material from other compartments, the remaining part of the dissimilar powder and granular materials transported earlier is collected from the bottom end of the vertical screw by reversing the hydraulic motors D and v. Mixing with different types of powder in the chamber can be avoided.

FIG. 3 shows another embodiment of the hydraulic motor control device, and the same parts as those in the embodiment of FIG. 2 are given the same reference numerals, and the other embodiment will be explained. The left position of this switching valve 17 is for reverse rotation, the intermediate position is for stopping, and the right position is for forward rotation. In the right position, the pressure oil from the oil pump 8 passes through the valve 17', is supplied to the hydraulic motors D, V, and B in order, passes through the check valve 36, returns to the oil reservoir 9 via the valve 17, and the three hydraulic motors are operated in this order. rotate forward. In the neutral position, the oil from the oil pump immediately returns to the oil reservoir after passing through the valve 17', and the hydraulic motor does not rotate. In the left position, pressure oil from the oil pump flows through valve 1.
After passing through 7', the hydraulic motors V and D pass through the check valve 37.
The oil is supplied in this order and returns to the oil reservoir via valve 17. Therefore, these motors V and D reverse in this order, but the hydraulic motor B is stopped because it is blocked by the check valve 36 and no pressure oil is supplied thereto.

As described above, according to the present invention, powder and granules can be discharged from a storage tank to a silo or the like, or powder and granules remaining in the discharge path can be collected by switching a single hydraulic motor switching valve. This makes it possible to extremely easily control the discharge of powder and granule transport vehicles that carry different types of powder and granules.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a powder transport vehicle equipped with the control device of the present invention, Fig. 2 is a piping system diagram of the control device of the embodiment of the present invention, and Fig. 3 is a diagram showing other parts of the control device. It is a piping system diagram showing an example. 1...Powder transport vehicle, 2...Car frame, 3...Tank, 4
...Bottom screw, 5...Vertical screw, 6
...discharge screw, D, V, B...hydraulic motor, 7...hydraulic cylinder, 8...oil pump, 9...oil reservoir, 10...strainer, 11...pressure oil main pipe, 12...valve box, 13...return pipe, 14... Relief valve, 15... Circulation pipe, 16... Hydraulic cylinder switching valve, 17, 17'... Hydraulic motor switching valve, 18...
Check valve, 19... Pressure oil sub pipe, 20... Branch pipe, 21... Pressure oil transfer pipe, 22... Shutoff valve, 23... Pipe, 24... Branch pipe, 25... Pressure oil transfer sub pipe, 26... Branch pipe, 27,2
8, 29... Conduit pipe, 30... Return pipe, 31... Main pipe, 3
2... Relief valve, 33... Pressure relief pipe, 34... Spring, 3
5... Short flow path, 36, 37... Check valve.

Claims (1)

[Claims] 1. A powder storage tank mounted on a vehicle frame, a transport means consisting of a bottom screw, a vertical screw, and a decaster system screw for transporting the powder and granule in the storage tank to the outside, and each screw of the transport means. and a driving means consisting of a hydraulic motor for each screw, which is provided with a single hydraulic motor switching valve for supplying pressure oil from an oil pump to each of the screw hydraulic motors. At the same time, each of the screw hydraulic motors is connected in series in order to obtain the same rotation direction, and by switching the hydraulic motor switching valve to the normal rotation position, the high pressure side port of the displacement screw hydraulic motor is connected. Piping is connected to the forward rotation side port and its low pressure side port to the reverse side port of the bottom screw hydraulic motor, and the pressure oil is sequentially supplied to the forward rotation side port of the discharge screw hydraulic motor, vertical screw hydraulic motor, and bottom screw hydraulic motor. The high pressure side port is connected to the reverse side port of the vertical screw hydraulic motor by switching the hydraulic motor switching valve to the reverse position. The low-pressure side port is connected to the normal rotation side port of the hydraulic motor for the discharge screw, and pressure oil is sequentially supplied to the hydraulic motor for the vertical screw and the reverse rotation side port of the hydraulic motor for the discharge screw, for use in the bottom screw. A control device for a powder transport vehicle, characterized in that it is configured to drive each hydraulic motor except the hydraulic motor in reverse.