JPH04283136A - Dumping type powder carrier - Google Patents

Abstract

PURPOSE:To prevent a cover body from its damage caused by its hitting on the road surface by opening the cover body mistakenly in the lifted condition of a tank 2 during a tare weight discharge operation where powder within the tank 2 is discharged through a discharge port 3 due to tare weight, and to prevent the tank 2 from yielding due to the negative pressure in the tank 2 caused by the tare weight discharge of the powder in the condition when a ventilating valve 8 is kept closed. CONSTITUTION:There is provided a control means to allow lifting of a tank 2 in the condition that a cover body 4 and a butterfly valve 8 are opened, or in the condition that the cover body 4 and the butterfly valve 8 are closed and the cover body 4 is locked by means of a locking device 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dump type powder transport vehicle. More specifically, the present invention relates to a dump type powder transport vehicle that can discharge powder and granular material stored in a tank using its own weight and compressed air.

0002

[Prior Art] Conventionally, as a dump-type powder transport vehicle, a discharge port for discharging powder and granules out of the tank is provided at the rear of a tank for storing powder and granules mounted on the vehicle body. By lifting the front side with a lift device, the powder and granules stored in the tank are discharged through the discharge port. Compressed air is supplied into the tank, and the air pressure of this compressed air is used to discharge the powder and granules. There is also a device equipped with an air discharge function that discharges air through a powder discharge pipe connected to the outlet.

[0003] In this type of powder transport vehicle, the discharge port is provided with a lid that is opened and closed by a hydraulic cylinder, and the lid is opened when empty weight is to be discharged, and when air is to be discharged. In each case, the powder and granules are discharged to the outside of the tank with the lid closed. Further, a vent valve that can be opened and closed is provided at a predetermined position on the front side of the tank. This valve is opened to prevent the inside of the tank from becoming negative pressure when the weight is discharged, and closed so that the inside of the tank can be pressurized when air is discharged. Furthermore, the lid body is locked by a locking device so that it will not open due to external pressure while the discharge port is closed.

0004

[Problems to be Solved by the Invention] In the powder transport vehicle having the above structure, in order to discharge its own weight, it is necessary to open the lid before lifting the tank. This is because if the lid is opened while the tank is lifted, the lid will collide with the ground and be damaged. Further, in order to prevent the tank from becoming depressed due to negative pressure inside the tank due to the discharge of the dead weight of the powder and granular material inside the tank, it is necessary to keep the ventilation valve open. However, the above transport vehicle is designed to be able to independently raise and lower the tank, open and close the lid, open and close the ventilation valve, and lock and unlock the lid using the locking device. It is also possible to open the lid after lifting the tank, and this operational error has caused the problem that the lid collides with the ground and is damaged. In addition, dead weight may be discharged with the ventilation valve closed, causing a problem in that the inside of the tank becomes negative pressure and a dent occurs in the tank. Furthermore, when opening the lid, it is necessary to unlock the lid by the locking device in advance, but if you forget to release the lock and perform the opening operation of the lid, the locking device or the lid may There was a problem that it caused damage.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a dump type powder and granular material transport vehicle that can prevent damage to the lid, tank, locking device, etc. due to operational errors. With the goal.

[0006]

[Means for Solving the Problems] A dump-type powder and granular material transport vehicle of the present invention to achieve the above object includes a tank for storing powder and granular material mounted on the vehicle body, and a tank provided at the rear of the tank, A discharge port for discharging powder and granular material out of the tank, a lid for opening and closing the discharge port, a locking device for locking the lid with the discharge port closed, and a powder discharge port connected to the discharge port. It is equipped with a pipe, an openable and closable ventilation valve that communicates with the front part of the tank, and a lifting device that lifts the front side of the tank and tilts the tank at a predetermined angle. A dump type that selectively performs dead weight discharge in which the powdered material is discharged by its own weight through the above-mentioned discharge port, and air discharge which is discharged through the above-mentioned powder discharge pipe by the air pressure of compressed air sent into the tank. In a powder transport vehicle, the lid opening/closing detection means detects the opening/closing state of the lid, the valve opening/closing detection means detects the opening/closing state of the ventilation valve, and the lid opening/closing detection means detects the opening/closing state of the lid when emptying its own weight. The control means detects that the valve is open and allows the lifting device to lift the tank in a state in which the valve opening/closing detection means detects that the valve is open.

[0007]However, the above-mentioned powder transport vehicle includes a lid lock detection means for detecting whether the lid is locked by a locking device, and a lid lock detection means for detecting whether the tank is lowered to a fixed position. When the tank lowering detection means and the lid lock detection means detect that the lid is locked by the locking device, or when the tank lowering detection means detects that the tank has not lowered to the normal position, The apparatus may further include a control means for regulating opening and closing of the lid.

[0008]

[Operation] According to the dump-type powder transport vehicle with the above configuration,
The control means allows the tank to be lifted by the lifting device in a state where the lid is opened and the ventilation valve is open when emptying the tank, so that the lid can be opened after lifting the tank. There is no risk of emptying the air with the ventilation valve closed.

[0009] Also, the lid lock detection means detects whether the lid is locked by the locking device, the tank lowering detection means detects whether the tank is lowered to a fixed position, and the lid lock detection means detects whether the lid is locked by the locking device. Control means for regulating the opening and closing of the lid in a state in which the detection means detects that the lid is locked by the locking device or in a state in which the tank lowering detection means detects that the tank has not been lowered to the normal position. If the lid is opened in the locked state, or the tank is not lowered to the normal position,
This can prevent the lid from being opened.

0010

Embodiments Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. FIG. 2 is a side view of the dump type powder transport vehicle of the present invention. This powder and granular material transport vehicle has a tank 2 for storing powder and granular material mounted on a vehicle body 1, and a tank 2 located below the rear end of this tank 2 for discharging the powder and granular material out of the tank. A discharge port 3 and a lid 4 that releasably closes the discharge port 3 are provided, and a powder discharge pipe 6 is introduced into the discharge port 3 through the lid 4. In addition, the lid body 4
is provided with a locking means 7 for restricting opening of the lid 4 with the discharge port 3 closed (see FIG. 3). Furthermore, in front of the tank 2, the tank 2
A lifting device 5 is provided for lifting the tank 2 using the rear end side as a fulcrum, and a butterfly valve 8 that can be opened and closed is provided at the front part of the tank 2 to communicate the front part inside the tank with the outside of the tank. At the upper part of the tank 2, a storage port 21 is provided for storing powder and granular material in the tank 2.

The lid 4 is rotatably attached to the tank 2 via a hinge 41, as shown in FIG. This lid body 4 has a rear end attached to the tank 2 and a rod 4 attached to the tank 2.
2a are opened and closed by hydraulic cylinders 42 rotatably connected to the hinges 41, respectively. Further, the discharge port 3 is provided with a limit switch LS1 for detecting that the lid 4 is closed, and a limit switch LS2 for detecting that the lid 4 is opened. These two limit switches L
S1 and LS2 constitute a lid opening/closing detection means, and are pressed when the lid 4 is opened or closed, respectively.

The lock device 7 is provided at a plurality of locations along the periphery of the lid 4, and includes a lock arm 72 that is rotatably operated by a hydraulic cylinder 71 rotatably fixed to the lid 4. By rotating the lock arm 72 clockwise in FIG. 3 with the lid 4 closed, the lock arm 72 is engaged with the flange 31 provided at the peripheral edge of the discharge port 3, and the lid is closed. Lock the body 4 so that it does not open. The locking device 7 includes a limit switch LS3 that detects that the lid 4 is locked, and a limit switch LS3 that detects that the lid 4 is locked.
A limit switch LS4 is provided to detect that the lock is in the unlocked state. These two limit switches LS3 and LS4 constitute a lid lock detection means, and are pressed in accordance with the rotation of the lock arm 72, respectively.

The butterfly valve 8 for ventilation is shown in FIG.
As shown in the figure, the opening and closing operation is performed by rotating the operating lever 81, and the opening and closing state is detected by a limit switch LS5 as a valve opening/closing detection means. This limit switch LS5 is pressed by a dog 82 that rotates together with the operating lever 81 when the butterfly valve 8 is opened.

The lifting device 5 includes a multi-stage hydraulic cylinder 51.
It is made up of. This elevating device 5 is provided with a limit switch LS6 as a tank tilt detection means for detecting whether the tank 2 is tilted at a predetermined angle. This limit switch LS6 is pressed by a dog 52 that rotates clockwise in FIG. 5 together with the hydraulic cylinder 51 in conjunction with the lifting operation of the tank 2.

[0015] Furthermore, in a portion of the vehicle body 1 corresponding to the lower surface of the front end of the tank 2, there is a device for detecting whether the tank 2 is lowered to a fixed position, that is, whether or not it is located at the lowering end. A limit switch LS7 is provided as tank lowering detection means (see FIG. 1). This limit switch LS7 is pressed when the tank 2 is lowered to the normal position. Further, the lid 4 is provided with a pressure switch 9 that is activated when the pressure inside the tank 2 exceeds a predetermined pressure (for example, 0.06 Kgf/cm2) (see FIG. 3).

FIG. 1 shows a control circuit, in which a power supply circuit A0 includes a main switch S and a pilot lamp PL1 that is turned on when the main switch S is turned on.
, circuit A1 for raising the tank 2, circuit B1 for lowering the tank 2, circuit A2 for locking the lid 4, and circuit B for unlocking the lid 4.
2. A circuit A3 for opening the lid 4, a circuit B3 for closing the lid, and a circuit A4 for notifying that the tank 2 has been lifted from the lower end are connected in parallel.

Circuit A1 for raising the tank 2
are the normally open contacts of the operation button PB1, the normally open contacts of the limit switches LS1 and LS3, the limit switches LS5,
Normally closed contact of LS6 and hydraulic cylinder 5 of lifting device 5
A circuit in which solenoids SOL1 for operating the hydraulic control valve to extend the hydraulic pressure control valve 1 are connected in series, and in parallel with the limit switches LS1, LS3, LS5,
It consists of a circuit in which a limit switch LS2 and a normally open contact of a limit switch LS5 are connected in series. Further, the circuit B1 for lowering the tank 2 includes a normally open contact of an operation switch PB2 and a solenoid SOL for operating a hydraulic control valve to contract the cylinder 51.
It consists of a circuit in which 2 and 2 are connected in series. Further, the circuit A2 for locking the lid 4 connects in series the normally open contact of the operation switch PB3 and the solenoid SOL3 of a hydraulic control valve that operates the cylinder 71 of the locking device 7 to lock the lid 4. It consists of a circuit. A circuit B2 for unlocking the lid 4 includes a normally closed contact of the pressure switch 9, a normally open contact of the operation switch PB4, and a hydraulic control valve that operates the hydraulic cylinder 71 to unlock the lid 4. It consists of a circuit in which the solenoid SOL4 is connected in series. The circuit A3 for opening the lid includes limit switches LS7, LS4,
The normally open contact of the operation switch PB5 and the solenoid SOL5 of a hydraulic control valve that operates the cylinder 42 to open the lid 4 are connected in series. A circuit B3 for closing the lid 4 includes a normally open contact of the operation switch PB6 and a solenoid of a hydraulic control valve that operates the cylinder 42 to close the lid 4, in parallel with the operation switch PB5 and the solenoid SOL5. It consists of a circuit in which SOL6 is connected in series. A circuit A4 for notifying the rise of the tank 2 has a pilot lamp 2 connected to the normally closed contact of the limit switch LS7.
and buzzer B are connected to each other.

With the powder transport vehicle having the above structure, the following control can be carried out. (1) To lift the tank 2, with the operation switch PB1 pressed, the limit switch LS1 is closed (that is, the lid 4 is closed), and the limit switch LS3 is closed (that is, the lid 4 is locked). ) and with the limit switch LS5 closed (that is, with the butterfly valve 8 closed). therefore,
Air discharge, which discharges the granular material in the tank 2 by air pressure, can be performed with the tank 2 lifted and tilted at a predetermined angle. Furthermore, in this case, it is possible to prevent the powder and granules in the tank 2 from leaking out of the tank through the outlet 3 and the butterfly valve 8 due to forgetting to close the lid 4 and the butterfly valve 8. (2) With the operation switch PB1 pressed, the limit switch LS2 is closed (that is, the lid 4 is opened).
, the tank 4 is allowed to rise while the limit switch LS5 is pressed (that is, the butterfly valve 8 is opened). Therefore, in the case of self-weight discharge, the tank 2 is lifted with the lid 4 closed, and when the lid 4 is opened in this lifted state, the lid 4 collides with the ground. It can prevent damage. Also, I accidentally installed butterfly valve 8.
By discharging the granular material under its own weight while the tank is closed, it is also possible to prevent the inconvenience of damage to the tank 2 due to negative pressure inside the tank 2. (3) Limit switch LS1 and limit switch L
When both S2 are in the open state, that is, when the lid body 4 is in an intermediate position where it is not completely opened, the tank 2
It is possible to prevent the lid body 4 from colliding with the ground by regulating the rise of the lid body 4. (4) Lifting of the tank 2 can be regulated when the limit switch LS1 is closed (that is, the lid body 4 is closed) and the limit switch LS5 is pressed (that is, the butterfly valve 8 is opened). . Therefore, it is possible to prevent a situation in which the inside of the tank 2 cannot be pressurized with compressed air while lifting the tank 2 due to forgetting to close the butterfly valve 8. (5) Unless limit switch LS4 is closed,
In other words, unless the lid 4 is in the unlocked state, the lid 4
cannot be released. Therefore, if you forget to unlock the lid 4 or the locking device 7,
etc. can be prevented from being damaged. (6) The lid 4 cannot be closed unless the limit switch LS7 is pressed, that is, unless the tank 2 is lowered to the normal position. Therefore, the lid body 4
By accidentally closing the lid 4 while the lid is lifted, it is possible to prevent the lid 4 from coming into contact with the ground and being damaged. (7) The lifting of the tank 4 is stopped by opening the limit switch 6 as a tank inclination detection means. Therefore, the tank 4 can be reliably stopped at a predetermined inclination angle, and the transport vehicle can be prevented from overturning due to lifting the tank 4 too much. (8) When the pressure switch 9 is opened, that is, when the pressure inside the tank 4 rises to a predetermined pressure or more, unlocking of the lid 4 is restricted. Therefore, by accidentally unlocking the lid 4 while the tank 4 is pressurized,
It is possible to prevent the lid body 4 from being forcibly opened and being damaged.

It should be noted that the powder transport vehicle of the present invention is not limited to the above-mentioned embodiments. For example, the various detection means may be configured with a proximity switch, a photoelectric switch, etc. instead of the above-described limit switch. Various design changes can be made.

[0020]

[Effects of the Invention] As described above, according to the dump type powder transport vehicle of the present invention, the tank can be lifted with the lid and the ventilation valve open.
When emptying the tank, there is no risk of erroneously opening the lid after the tank has been raised, and damage to the lid due to the erroneous operation can be prevented. Furthermore, there is no risk of forgetting to open the ventilation valve and discharging the powder or granules under its own weight, and it is possible to prevent damage to the tank due to negative pressure in the tank due to forgetting to open the valve.

Further, according to the dump type powder and granular material transport vehicle according to the second aspect, since the lid cannot be opened or closed in a locked state, it is possible to forget to release the lock and open the lid. By operating it, you can prevent damage to the locking device and the lid, and the lid can only be opened and closed when the tank is lowered to the fixed position.
By opening and closing the lid with the tank raised, it is possible to prevent the lid from colliding with the ground and being damaged.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing an embodiment of a dump type powder transport vehicle of the present invention.

FIG. 2 is a side view of the powder transport vehicle.

FIG. 3 is an enlarged view of the vicinity of the discharge port.

FIG. 4 is an enlarged view of a ventilation valve.

FIG. 5 is a side view showing the main parts of the lifting device.

[Explanation of symbols]

1 Vehicle body 2 Tank 3 Discharge port 4 Lid 5 Elevating device 6 Powder discharge pipe 7 Locking device 8 Butterfly valves LS1, LS2 for ventilation Limit switches LS3, LS4 as lid detection means Limit as lid lock detection means switch

Claims (2)

[Claims] [Claim 1] A tank for storing powder and granular material mounted on a vehicle body, an outlet provided at the rear of the tank for discharging the powder and granular material out of the tank, and a lid body for opening and closing the outlet. A locking device that locks the lid with the discharge port closed, a powder discharge pipe that communicates with the discharge port, an openable/closeable ventilation valve that communicates with the front of the tank, and the front of the tank. and a lifting device that lifts the tank and tilts the tank at a predetermined angle. In a dump-type powder transport vehicle that selectively discharges air through the powder discharge pipe using the air pressure of compressed air, a lid opening/closing detection means for detecting an open/closed state of the lid; A valve opening/closing detection means detects whether the valve is open or closed, and a lid opening/closing detection means detects that the lid is open when the dead weight is discharged, and a valve opening/closing detection means detects that the valve is open. 1. A dump-type powder and granular material transport vehicle, characterized in that the dump-type powder and granular material transport vehicle is equipped with a control means that allows the tank to be lifted by an elevating device in this state. 2. Lid lock detection means for detecting whether the lid is locked by the locking device; tank lowering detection means for detecting whether the tank is lowered to a fixed position; and lid lock. Control means for regulating the opening and closing of the lid in a state in which the detection means detects that the lid is locked by the locking device or in a state in which the tank lowering detection means detects that the tank has not been lowered to the normal position. The dump type powder transport vehicle according to claim 1, further comprising: