JPS5926827A - Granular material conveying car control device - Google Patents

Abstract

PURPOSE:To prevent an engine from being stopped by detecting the reduction of the engine speed at discharging granular material and opening the on-off valves of an exhaust tube. CONSTITUTION:On-off valves 22, 23 controlled by receiving a signal from a control circuit 21 are arranged downstream a connection part between an exhaust tube 6 and an introducing tube 7. The control circuit 21 signals when an engine speed detecting means 29 detects the engine speed less than a prescribed value that control valves 22, 23 should open. In such a way, the reduction of the engine speed is detected at discharging granular material, and thereby the on- off valves of the exhaust tube are opened, so that it is possible to prevent the engine from being stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a granular material transport vehicle that uses engine exhaust gas to pump dangerous granular material such as pulverized coal.

In general, in a dust explosion, as the oxygen concentration decreases, the explosion pressure and pressure rise rate decrease, and eventually the substance loses its explosive properties. Furthermore, the critical oxygen concentration to prevent floating coal dust from igniting due to electric sparks is said to be 16% or less.

In this sense, it is effective to use vehicle engine exhaust gas to pump hazardous powder and granules.

Powder transportation vehicles that use engine exhaust gas to forcefully transport powder and granule materials are known (for example, Kabuto Kimiaki + g-fg
4 names).

However, in such a transport vehicle, when the exhaust gas pressure increases due to a phenomenon such as when the powder or granules become closed during pumping, the engine speed decreases due to the load.
Eventually it stops. As a result, high-pressure exhaust gas containing moisture flows back into the engine from a water scrubber disposed in the inlet pipe to remove dust contained in the exhaust gas, and there is a risk of damaging the engine.

The present invention has been made in view of the above-mentioned points, and when the engine speed drops below one-stroke speed, at least the on-off valve interposed in the exhaust pipe from the engine is opened to prevent the engine from stopping. This prevents exhaust gas from flowing back into the engine through the pipe.

Embodiments of the present invention will be described below with reference to the drawings.

3 is a powder/granular material M carrier, in which a powder/granular material storage tank 2 is mounted on a vehicle body 1, and a dump cylinder 6 is interposed between the front part of the powder/granular material storage tank 2 and the vehicle body 1.

Reference numeral 4 denotes a discharge section formed at the lower rear end of the powder storage tank 2, into which exhaust gas from the engine is introduced to fluidize the powder, as will be described later. Reference numeral 5 designates the engine of the powder transport vehicle (1). One end of the introduction pipe 7 is connected to the exhaust pipe B of the engine 5, and the other end of the introduction pipe 7 is connected to the primary air supply pipe 8 and the secondary air supply pipe 8. Supply pipe? It is connected to the discharge section 4 via.

By the way, at the introduction point 1°7, a water scrubber 1 is installed to collect dust contained in the engine exhaust gas.
0. Cooler 11. A cyclone 12° heater 16 is interposed in order. Further, the back pressure air supply pipe 14, which has one end connected to the introduction v7 and the other end connected to the upper part of the powder storage tank 2, is provided with an on-off valve 15 and a check valve 16 in the middle thereof. There is.

In addition, the above-mentioned primary air supply pipe 8 and secondary air supply pipe 9
On-off valves 17 and 18 and check valves 19 and 20 are respectively provided.

Incidentally, on the downstream side of the connection between the exhaust pipe 6 and the introduction pipe 7, on-off valves 22 and 23 are arranged which are controlled to open and close in response to signals from the control circuit 21, as will be described later. As shown in FIG.
In addition, the opening and closing may be controlled directly by the 5OLB.
As shown in FIG. 2, an electromagnetic control valve 25° 2 is interposed in the air piping connected to the vehicle near reservoir 24.
Opening/closing control may be performed by outputting a signal from the control circuit 21 to the solenoids 5OLa and 5OLb of No. 6, and expanding and contracting the air cylinders 27 and 28.

Reference numeral 29 is a detection device for detecting the engine rotation speed, and when the engine rotation speed is below a certain level, for example, 300 to 40 (I r p
When the voltage decreases to m, the signal is output to the control circuit 21.

Next, to explain the operation of the present invention, first, after introducing fine powder into the powder storage tank 2 through the manhole 30,
Transport to destination. Next is powder storage tank 2))
When discharging pulverized coal, the dump cylinder 3 is extended and the granular material storage tank 2 is tilted Ij, and then the start switch (not shown) is operated by j and ψ, and a signal is output from the control circuit 21. (□T) At the same time as opening the closing valve 26,
Close the on-off valve 22. Next, when the on-off valve 17 is opened, the exhaust gas from the engine 5 flows through the exhaust pipe 6 and the inlet pipe 7.
, -a flows into the discharge part 4 through the air supply pipe 8, mixes the pulverized coal into the exhaust gas, and discharges it to the outside.

At this time, a water scrubber 10 is installed in the middle of the introduction pipe 7.
．． Since the cooler 11, cyclone 12, and heater 16 are installed in this order, the coarse dust contained in the engine exhaust gas is first removed by the water scrubber 10. And the exhaust gas is water scrubber 10
After the temperature is lowered (350°0 to 80°a), it is further cooled (80°a to Pd2°C) by the cooler 11, resulting in condensation with fine dust as the core, and the cyclone 12
Moisture and fine dust are removed. After that, the temperature is raised (4000-Pao °C) by the heater 16, so
Moisture in the supersaturated exhaust gas flowing out from the cooler 11 is evaporated by natural air cooling. Therefore, there is no fear that the inner wall of the discharge part 4 will return, the pulverized coal will adhere and solidify, and the discharge part 4 will become clogged.

If the pressure inside the powder storage tank 2 drops, the on-off valve 15 is opened to allow exhaust gas to flow into the powder storage tank 2, thereby preventing the tank pressure inside the powder storage tank 2 from decreasing. can.

By the way, when a closed cold phenomenon occurs when discharging the powder, the pressure of the exhaust gas increases, and as a result, the load on the engine 5 increases and the engine speed decreases.

In this case, the engine rotation speed is detected by the detection device 29, and when the engine rotation speed falls below a certain level, the control circuit 29 detects the engine rotation speed.
Output to 1. Therefore, the control circuit 21 controls the solenoids 5OLA and S.

A signal is output to TJ B for a certain period of time, and the on-off valves 22 and 23 are switched. That is, the on-off valve 22 is opened and the on-off valve 2 is opened.
As a result of closing the filter, the engine 5 becomes a no-load operation, and when the engine speed returns to the working state, the engine speed becomes 11η, and the inlet pipe 7 is closed, so that high-pressure exhaust gas containing moisture enters the engine from the water scrubber 10. There is no backflow to the 5th side.

In this case, by opening at least the on-off valve 22, the high-pressure exhaust gas containing moisture in the inlet pipe 711tt+ is released into the atmosphere, so the on-off valve 26 is specifically closed as in the embodiment. There's no need. During this time, the shut-off phenomenon may be canceled by, for example, opening the on-off valve 18 and supplying secondary air to the discharge section 4.

As described above, in the present invention, when discharging powder and granules,
Since the exhaust pipe opening/closing valve is opened upon detecting a drop in engine speed, the engine does not stop and moisture-laden exhaust gas does not flow back into the engine from the inlet pipe.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing another operating mechanism of the on-off valve of the present invention. 2... Powder storage tank, 4... Discharge section, 5...
...Engine, 6...Exhaust pipe, 7...Introduction pipe, 21...Control circuit, 22.23...Opening/closing valve,
29...Detection device. Applicant Shinmeiwaji [Gyo Co., Ltd. J1 Gauda Hyakusanbu]

Claims (1)

[Claims] (1) One end of an inlet pipe connected to the exhaust pipe from the engine is connected to the discharge part of the powder storage tank, and the powder is pumped using the engine exhaust gas. In the powder transport vehicle, an on-off valve is provided on the downstream side of the connection between the inlet pipe and the exhaust pipe, and a detection device for detecting the engine rotation speed is provided, so that the engine rotates at a constant speed. A control circuit for a powder transport IF, characterized in that it is provided with a control circuit that opens at least a +1iiJ exhaust pipe opening/closing valve when the temperature drops below 1. n (2) The rijl record 6i11 circuit is such that when the exhaust pipe opening/closing valve 1 is opened, the inlet pipe opening 1■ valve is closed 1-7 FT+7=;4rJ7'Admiral 1 Scope of Purchasing Control of the powder and granular material transport vehicle described in item 1 (111 necking). (6) The opening/closing valve is controlled to open and close by a solenoid.
A control device for a powder transport vehicle according to claim 1!11. (4) The control device for a powder transport vehicle according to claim 1, wherein the opening/closing valve is controlled to open/close by an air cylinder whose expansion and contraction are controlled by an electromagnetic control valve from a JLJ mounting near reservoir.