JPS6234827A - Dump truck - Google Patents

Abstract

PURPOSE:To restrain exhaust gas from being inducted into a load carrying platform when the said platform is titled so as to prevent the said platform from being contami nated by exhaust gas by providing a change-over means on a halfway of an exhaust pipe where the said mean is capable of switching the induction of gas into the said platform over to the cut-off of gas, and vice versa. CONSTITUTION:A connecting pipe 4 is provided for a load carrying platform 3 of a dump truck 1, by a step of circulating exhaust gas which is inducted into the said pipe 4, in the said platform 3 and discharging it from the rear end, earth and sand and the like in the said platform 3 are heated fro drying. And a muffler 6 is provided on a halfway of an exhaust pipe 5 which is extended from an engine E, and both a joint which inducts exhaust gas into the connecting pipe 4, and a change-over means 7 which is capable of cutting off an exhaust gas flow to the connecting pipe 4, are also provided on a halfway of the exhaust gas pipe 5 at the downstream side of the muffler 6. This changeover means 7 is composed of NO.1 and NO.2 closing valves 9 and 11 which are driven by each of pneumatic cylinder 10 and 12, and controls the exhaust gas flow to the connecting pipe side in such a way that it is cut off when the said platform 3 is actuated so as to be titled.

Description

Detailed Description of the Invention A0 Objective of the Invention + 1) Industrial Field of Application The present invention provides a vehicle chassis configured to enable gas flow within a wall and rotatable between a horizontal position and an inclined position. The present invention relates to a dump truck in which a cargo box supported by a cargo box and an exhaust pipe of an engine are in contact with each other when the cargo box is in a horizontal position.

(2) Conventional technology Conventionally, in such dump trucks, a three-way tee connectable to the cargo box is inserted in the middle of the exhaust pipe, and the rear open end of the exhaust pipe is closed to guide exhaust gas to the cargo box. This system heats and dries the earth and sand loaded in the container, preventing it from adhering to the cargo box and improving discharge efficiency.

(3) Problems to be Solved by the Invention However, in the above-mentioned conventional dump truck, when the loading box is placed in an inclined position in order to discharge earth and sand, the upper part of the three-way tee remains open, and exhaust gas flows into the loading box. The product is sprayed onto the bottom of the container, making the shipping box dirty.

The present invention has been made in view of the above circumstances, and is designed to avoid soiling of the cargo box by blocking the flow of exhaust gas toward the cargo box when the cargo box is placed in an inclined position. The purpose is to provide dump trucks with

B0 Structure of the Invention (1) Means for Solving the Problems According to the present invention, in the middle of the exhaust pipe, there are two states: a state in which exhaust gas is guided to the cargo box side, and a state in which the flow of exhaust gas to the cargo box side is blocked. A control means for controlling the operation of the switching means operates the switching means to a state where the flow of exhaust gas to the cargo box is cut off in response to the tilting operation of the cargo box. Constructed as possible.

(2) Function When the cargo box is tilted to discharge loaded materials such as earth and sand, the switching means is operated by the control means to cut off the flow of exhaust gas to the cargo box side.

(3) Embodiment Hereinafter, an embodiment of the present invention will be explained with reference to the drawings.The chassis 2 of the dump truck 1 has a horizontal position on the chassis 2 and a chain line for discharging loads such as earth and sand. The cargo box 3 is supported so as to be rotatable between inclined positions as shown in FIG.

The wall of this packing box 3 is formed to allow exhaust gas to circulate, and the exhaust gas introduced from the connecting pipe 4 provided at the bottom of the packing box 3 flows forward within the wall of the packing box 3. It then turns backwards and is ejected from the rear.

A muffler 6 is provided in the middle of an exhaust pipe 5 extending rearward from the engine E mounted on the dump truck 1. A muffler 6 is provided in the middle of the exhaust pipe 5 on the rear side of the muffler 6. A switching means T is provided which can switch between a state in which the flow of exhaust gas is conducted and a state in which the flow of exhaust gas to the connecting pipe 4 is cut off.

In FIG. 2, the switching means 1 is a T-shaped three-way tee 8.
, a first on-off valve 9, a first pneumatic cylinder 10 for driving the first on-off valve 9, a second on-off valve 11, and a second pneumatic cylinder 12 for driving the second on-off valve 11. Be prepared.

The first on-off valve 9 is provided in the exhaust pipe 5 on the rear side of the three-way tee 8, and the second on-off valve 11 is connected to the upper part of the three-way tee 8. The short pipe 13 connected to the upper part of the second on-off valve 11 and the connecting pipe 4 provided in the cargo box 3 are connected to each other when the cargo box 3 is in a horizontal position.

In this switching means T, the first on-off valve 9 is closed and the second on-off valve 9 is closed.
When the on-off valve 11 is opened, the exhaust gas from the engine E is guided into the short pipe 13, that is, the connecting pipe 4 that is connected to the short pipe 13, and when the first on-off valve 9 is opened and the second When the on-off valve 11 is closed, the exhaust gas short pipe 13
Cut off the flow to.

The first pneumatic cylinder 10 is connected to the first on-off valve 9 so that its extension action is an opening action, and its contraction action is a valve closing action. Further, the second pneumatic cylinder 12 is connected to the second on-off valve 11 so that its extension action is a valve-closing action, and its contraction action is a valve-opening action.

In FIG. 3, first and second pneumatic cylinders 10.
12 is connected to a compressed air source 14 such that its extension and contraction operations occur simultaneously. That is, the compressed air supply source 14 is connected to the supply pipe line 16 via a pressure control valve 15 that opens when the supply air pressure from the compressed air supply source 14 is equal to or higher than a certain value, and the compressed air supply source 14 is connected to the supply pipe line 16 through a pressure control valve 15 that opens when the supply air pressure from the compressed air supply source 14 is equal to or higher than a certain value. The twelve rondo chambers are each connected to the supply conduit 16. Also rain pneumatic cylinder 10°120
The head chamber is connected to the supply pipe 1 via the valve switching valve 17.
Connected to 6. This valve switching valve 17 can be switched between a right position where the supply pipe 16 is communicated with the head chamber and a left position where the head chamber is opened to the outside. Switch to . In response to this switching to the right position, pressurized air is supplied to the head chamber, causing each pneumatic cylinder 10.12 to extend, and the switching valve 177 for valves becomes the left position, and each head chamber is released to the atmosphere. Then, each pneumatic cylinder 10.12 is operated to contract.

In order to rotate the cargo box 3 from a horizontal position to an inclined position, the power of the engine E is used, and a power extraction device (not shown) is used to extract the power from the engine E.
is installed on the dump truck 1. The connection and disconnection of the engine E and the power take-off device are performed in accordance with the operation of the power fluid and the disconnection pneumatic cylinder 19. When the power fluid and the disconnection pneumatic cylinder 19 are extended, the engine E and the power A retrieval device is connected. For this purpose, the power fluid/disconnection pneumatic cylinder 19 has its Rondo chamber connected to the supply line 16, and its head chamber connected to the supply line 16 via the switching valve 20. The switching valve 20 is a 3-point, 2-position electromagnetic switching valve similar to the switching valve 17 for valves, and connects the supply pipe 16 with power in response to the excitation of the solenoid 21, and connects the supply pipe 16 to the head chamber of the cylinder 19 by disconnecting the air pressure. When the solenoid 21 is demagnetized, the head chamber of the pneumatic cylinder 19 is moved to the outside '1'! ! The left position is connected to %%'t. Therefore, in response to the excitation of the solenoid 21, the power fluid/disconnection pneumatic cylinder 19 is operated to extend, thereby connecting the engine E and the power extraction device.

FIG. 4 shows a control means 22 for controlling the operation of the switching means 7, and this control means 22 includes a power take-off switch 23 for starting the operation of the power take-off device, and a power take-off switch 23 for starting the operation of the power take-off device. Clutch switch 24 conducts when the clutch is disengaged to start operation, and relay coil R
and the first one which becomes conductive in response to the excitation of the relay coil R. Second
and third relay switch j'? l, R'l, R3
and a solenoid 18.21 of each switching valve 17.20.

A series circuit consisting of the power take-off switch 23, the clutch switch 24 and the relay coil R, a series circuit consisting of the first relay switch R1 and the solenoid 18, and a second
A series circuit consisting of relay switch R2 and solenoid 21 is connected in parallel to DC power supply 26 via main switch 25. Further, the third relay switch R3 is connected in parallel to the clutch switch 24.

Next, to explain the operation of this embodiment, when the cargo box 3 in a horizontal position is loaded with wet earth and sand, etc., and the vehicle is traveling,
The power take-off switch 23 is cut off, and the relay coil R is in a demagnetized state. For this reason, each relay switch R1,
R'l and R3 are also blocked, solenoid 18.21
are also in the demagnetized state, so that each switching valve 17.18 is in the left position and each pneumatic cylinder 10.12.19 is in the retracted state.

Therefore, the first switching valve 9 is closed and the second switching valve 11 is open, and the waste from the engine E is guided from the connecting pipe 4 to the cargo box 3, heating damp earth and sand, etc. Drying takes place.

When the clutch is disengaged and the power take-off switch 23 is turned on in order to tilt the cargo box 3 in order to discharge earth and sand, the third link is turned on as the clutch switch 24 is turned on and the relay coil R is energized. Switch R3 is turned on, and the excited state of relay coil R is maintained even after clutch switch 24 is turned off.

Since the first and second relay switches R1 and R2 are also conductive in response to the excitation of the relay coil R, both solenoids 18.
21 are respectively excited, and both switching valves 1γ and 20 are switched to the right position. Therefore, rain pneumatic cylinder 10.12
is extended, and the first on-off valve 9 opens and the second on-off valve 11 closes. In addition, in response to the extension of the power connection/disconnection pneumatic cylinder 19, the power extraction device is activated to start tilting the cargo box 3, and dry earth and sand are efficiently discharged.Moreover, at this time, exhaust gas is not discharged to the cargo box 3 side, but is discharged from the rear open end of the exhaust pipe 5.
It is possible to prevent the bottom of the cargo box 3 from becoming contaminated with exhaust gas.

In the above embodiment, the switching means 7 has two on-off valves 9 and 11.
However, a three-way switching valve may also be used (in that case, only one driving means such as a pneumatic cylinder for driving the three-way switching valve is required.

C0 Effects of the Invention As described above, according to the present invention, there is a switch in the middle of the exhaust pipe that can switch between a state in which exhaust gas is introduced to the cargo box side and a state in which the flow of exhaust gas to the cargo box side is blocked. The control means for controlling the operation of the switching means is configured to operate the switching means to a state where the flow of exhaust gas to the cargo box is cut off in response to the tilting operation of the cargo box. When tilting the cargo box, avoid guiding the exhaust gas toward the cargo box.
It is possible to prevent the packing box from becoming contaminated with exhaust gas.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the vehicle, FIG. 2 is an enlarged side view of the switching means, and FIG.
The figure is an air pressure control circuit diagram, and FIG. 4 is an electric circuit diagram showing the configuration of the control means. 1... Dump truck, 2... Chassis, 3... Loading box, 5...
...Exhaust pipe, 7...Switching means, 22...Control means,
E...Engine patent applicant Nagano Isuso Jidosha Co., Ltd. Kyokuto Kaihatsu Kogyo Co., Ltd. Figure 3 Figure 4

Claims (1)

[Claims] A cargo box configured to allow gas circulation within the wall and supported by a vehicle chassis so as to be rotatable between a horizontal position and an inclined position, and an engine exhaust pipe, the cargo box being in a horizontal position. In the dump truck that is sometimes connected, a switching means is provided in the middle of the exhaust pipe, which can switch between a state in which exhaust gas is introduced to the cargo box side and a state in which the flow of exhaust gas to the cargo box side is cut off. The control means for controlling the operation of the switching means is configured to operate the switching means to a state where the flow of exhaust gas to the cargo box is cut off in response to the tilting operation of the cargo box. .