JPH0311931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emission control device for a powder transport vehicle.

2. Description of the Related Art Conventionally, a powder transport vehicle is known that can discharge powder and granule stored in a powder storage tank to a silo or the like via a transport cylinder. When discharging powder and granular materials to storage facilities such as underground in the case of such a powder transport vehicle, the transport cylinder must be sequentially rotated and raised to position the discharge port. In addition to being cumbersome to operate, the rotation of the transport tube and the undulating space required make it impossible to discharge the powder or granular material using such a vehicle depending on the location. In order to solve such problems,
The applicant had previously filed Japanese Patent Application No. 58128 (1983).
154342), this discharge control device uses a tandem pump and is equipped with a mechanism that drives only the first conveyance means located at the bottom of the powder storage tank in the normal direction. As the number of control valves increases, the piping system becomes complicated and expensive.

The present invention has been made in view of the above points, and uses a simple hydraulic circuit to selectively discharge powder and granular materials to a high place such as a silo using a conveyor tube, and to discharge them by dropping them into underground equipment from the rear of the tank. It is configured so that it can be switched to.

Embodiments of the present invention will be described below based on the drawings. 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 disposed on the vehicle frame 2. will be installed. The inside of this tank is divided, and a manhole 4 for charging powder and granules is provided in the upper part of each compartment, and a plurality of transport means are used to transport the powder and granules in the tank to silos, etc., as appropriate. A body removal device, for example a screw conveyor type conveying means, is provided. This conveyance means includes a horizontal first conveyance means 5 connected to a delivery port at the bottom of the tank, and two conveyance means disposed in a conveyance tube 6 erected along the rear wall of the tank 3 from its delivery side end. means 7, and a third conveyance means 9 disposed within a boom-shaped conveyance cylinder 8 extending from the upper end thereof toward the distal end discharge port.
It is composed of. The third conveying means 9 uses a hydraulic cylinder 10 to control the height of its discharge port.
is arranged between the conveyance cylinders 6 and 8. In addition,
At the rear of the storage tank, in order to guide the floating particles in the storage tank 3 to the transport cylinder 6, a guide cylinder 3' that surrounds the rear of the first transport means 5 is extended. Although not shown in detail, this guide cylinder A shutter 11 for controlling opening and closing of the rear end opening is installed at 3'.

By the way, first, second and third hydraulic motors B, V and D shown in FIG. 2 are connected as driving means to each of the above-mentioned conveying means 5, 7 and 9, respectively. It is assumed that these hydraulic motors B, V, and D are driven in forward rotation or reverse rotation by switching the flow direction of the flowing pressure oil.

The discharge control system of the present invention is shown in FIG. 2 as hydraulic lines for these hydraulic motors B, V and D and hydraulic cylinder 10.

In FIG. 2, the hydraulic pump 12 is driven by the prime mover of a transport vehicle, for example, and the oil reservoir 13
The first and second switching control valves V are connected to the parallel circuit through the main pressure oil pipe 14 and the pressure oil is connected to the parallel circuit through the pressure oil main pipe 14.
1 and V2.

The first switching control valve V1 is connected to each of the hydraulic motors B and V.
and D, and the second switching control valve V2 is a three-position switching valve that controls the hydraulic cylinder 10. By the way, the first switching control valve V
One end of piping 15 is connected to port A1 of 1,
The other end of this pipe 15 is connected to a normal rotation side inlet of a third hydraulic motor D.

The reverse rotation side inlet of the third hydraulic motor D and the forward rotation side inlet of the second hydraulic motor V are connected by the piping 16, and the reverse rotation side inlet of the second hydraulic motor V and the forward rotation side inlet of the first hydraulic motor B are connected to each other by the piping 16. The reverse side inflow port of the first hydraulic motor B is connected to the port B1 of the first switching control valve V1 via a pipe 18. That is, the third hydraulic motor D and the second hydraulic motor V are connected from the port A1.
and the first hydraulic motor B are connected in this order so that they can sequentially rotate forward.

On the other hand, a piping 19 is connected to port A2 of the second switching control valve V2, and a hydraulic cylinder 10 is connected to the other end via a plug 20, and the port B2 of the switching control valve V2 and the aforementioned piping 17 by a first bypass conduit 21.

Further, a second bypass line 22 is connected between the above-mentioned pipes 17 and 18, and this pipe 22 is provided with a check valve 23 that only allows pressure oil to flow from the pipe 18 to the pipe 17. Placed. Further, a bypass pipe 25 in which a control valve 24 is provided is connected between the pipe 15 and the pipe 17 described above.

Reference numeral 26 denotes a relief valve which is controlled to open and close by introducing the pilot pressure of the pipe 16 through the pilot pipe 27, and is used in the event of clogging of powder or granular material at the connection between the first conveying means 5 and the second conveying means 7. , the pipe 16 of the normal rotation side inlet of the second hydraulic motor V becomes high pressure and is opened, and the pressure oil from the pipe 17 is returned to the oil reservoir 13 via the oil return main pipe 27.

Note that the ports P of the first and second control valves V1 and V2 are connected to the pressure oil main pipe 14 via the check valve CK, and the ports T are connected to the oil reservoir 13 via the oil return main pipe 27.

Next, to describe the operation of the present invention, in order to transport the powder and granular material in the storage tank 3 to the silo S, the shutter 11 is first closed, the cock 20 is opened, and the second switching control valve V2 is moved to the left and right positions. Pressure oil from the hydraulic pump 12 is supplied to the hydraulic cylinder 10 via the pipe 19. As a result, the hydraulic cylinder 10 is extended, and together with the rotation operation of the conveying tube 6, the distal end outlet of the conveying tube 8 can be made to face the input port of the silo S. Next, after returning the second switching control valve V2 to the neutral position and closing the cock 20, if the first switching control valve V1 is switched to the left position, the pressure oil from the hydraulic pump 12 is transferred to the first switching control valve V1. Supplied from port A1 to piping 15 and connected to third hydraulic motor D
is first driven in normal rotation, and the discharged oil drives the next second hydraulic motor V, and then the first hydraulic motor B, in order. Therefore, the third, second, and first conveying means 9, 7, and 5 linked to the respective hydraulic motors D, V, and B are also driven in normal rotation, and the powder and granules in the storage tank 3 are transferred to the silo S, etc. Can be transported.

When the receiving equipment such as silo S is approximately full, then by switching the second switching control valve V2 to the right position with the die 1 switching control valve V1 switched to the left position, the third and The pressure oil that has reached the pipe 17 via the two hydraulic motors D and V returns to the oil reservoir 13 via the first bypass pipe 21, the second switching control valve V2, and the oil return main pipe 27. Stop. Therefore, while the first conveying means 5 is stopped, the third conveying means 9 and the second conveying means 7 continue to drive in normal rotation, and the powder and granules remaining in the conveying tubes 6 and 8 are discharged to the outside, such as the silo S. can do.

When the discharge work is completed, the first switching control valve V1 is returned to the neutral position and the cock 20 is opened.
The pressure oil in the hydraulic cylinder 10 is controlled by the second switching control valve V2.
Since the oil returns to the oil reservoir 13 through , the hydraulic cylinder 10 contracts. In this case, by rotating the transport cylinder 6, the transport cylinders 6 and 8 can be returned to the storage position.

In addition, the powder and granular materials in the transport cylinders 6 and 8 are transferred to the transport cylinder 6.
When collecting from the lower part, the first switching control valve V1
All you have to do is switch it to the right position. In this case, pressure oil from the hydraulic pump 12 is supplied to the pipe 18 through the port B1 of the first switching control valve V1. By the way, since the second bypass pipe 22 is connected between the pipes 18 and 17 via the check valve 23, the pressure oil is
It is supplied to the piping 17 without driving the hydraulic motor B in reverse, and the second and third hydraulic motors V and D
Only the motors are sequentially driven in reverse. Therefore, the powder and granular materials in the conveyance cylinders 6 and 8 are collected from the lower part of the conveyance cylinder 6 by reversely driving the second conveyance means 7 and the third conveyance means 9.

On the other hand, when discharging into a storage facility such as underground, after opening the shutter 11,
When the first switching control valve V1 is switched to the left position, the pressure oil from the hydraulic pump 12 is transferred to the port A1.
It is supplied to the pipe 17 from the bypass pipe 25. Therefore, only the first hydraulic motor B is driven in normal rotation while the third hydraulic motor D and the second hydraulic motor V are held in a stopped state. As a result, the first
Only the conveyance means 5 rotates normally, and the powder and granular material in the storage tank 3 can be dropped into the storage facility and discharged from the rear end discharge port of the guide cylinder 3'.

As described above, in the present invention, a plurality of hydraulic motors that rotationally drive the conveying means are connected in series via a first control valve so as to be able to rotate forwardly or reversely, and the first control valve is connected to a third hydraulic motor. A simple circuit configuration in which a bypass piping equipped with a control valve is connected to the normal rotation side inlet of the first hydraulic motor bypassing the second hydraulic motor allows normal rotation drive of all hydraulic motors and 1. You can select normal rotation drive of only the hydraulic motor, and by controlling the opening and closing of the rear end opening of the guide tube connected to the rear end of the storage tank, you can discharge to a high place using the transport tube or underground. It is possible to choose between discharging the waste into the equipment.

Furthermore, when driving all the hydraulic motors that drive the conveyance means in normal rotation, only the first hydraulic motor can be stopped by using one position of the switching control valve that controls the hydraulic cylinder for luffing. The powder and granular material inside the conveyance cylinder can be reliably discharged to the outside. Further, when the hydraulic motor is driven in reverse, only the first hydraulic motor is held in an inoperative state so that the powder and granules can be collected from the lower part of the conveying cylinder.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall side view showing an example of a powder transport vehicle equipped with the control device of the present invention, and FIG. 2 is a diagram showing the discharge control of the embodiment of the present invention. It is a piping system diagram of an apparatus. 1... Powder transport vehicle, 3... Accommodation tank, 5...
...First conveyance means, 7...Second conveyance means, 9...Third conveyance means, 10...Hydraulic cylinder, 12...Hydraulic pump, 21, 22...Bypass pipe line, 25...
...Bypass piping, D, V, B...Hydraulic motor, V
1, V2...Switching control valve.

Claims (1)

[Scope of Claims] 1. A powder storage tank mounted on a vehicle frame, a first conveyance means provided at the bottom of the storage tank, and a first conveyance means connected to the first conveyance means and provided at the rear of the storage tank. a third conveying means communicated with the second conveying means and movable up and down by a hydraulic cylinder; and first and second conveying means for driving these conveying means.
and a third hydraulic motor, and first and second hydraulic motors that control these hydraulic motors and the hydraulic cylinder.
In a powder transport vehicle comprising a switching control valve and a single hydraulic pump that supplies pressure oil to the hydraulic motor and the hydraulic cylinder, the first, second and third
The hydraulic motors are sequentially connected in series to the hydraulic pump via the first control valve, and a bypass pipe communicating with the first control valve is connected to the pipe connecting the first hydraulic motor and the second hydraulic motor, A control valve is disposed in the bypass pipe, and by controlling the opening and closing of the control valve, all hydraulic motors are driven in normal rotation, and the first hydraulic motor is stopped and the second and third hydraulic motors are driven. 1. A discharge control device for a powder and granular material transport vehicle, characterized in that a state in which normal rotation and reverse rotation is performed, and a state in which only a first hydraulic motor is driven in normal rotation are selected. 2 Connect one end of the first bypass pipe to the normal rotation side inlet of the first hydraulic motor, connect the other end to one port of the second switching control valve, and use one position of the second switching control valve. 2. The discharge control device for a powder transport vehicle according to claim 1, wherein the third and second hydraulic motors can be rotated in the normal direction. 3. A second bypass line is connected between the first control valve and the reverse side inlet of the second hydraulic motor, and the second bypass line has a direction from the first control valve to the reverse side inlet of the second hydraulic motor. 2. The discharge control device for a powder transport vehicle according to claim 1, further comprising a check valve that allows pressure oil to flow only to the pump.