JPH0738478Y2 - Pneumatic pumping and discharging device transport distance increasing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a transport distance increasing device for a pressure-feeding and discharging device excavated by a shield machine.

(Prior Art) Conventionally, a pneumatic pumping and discharging device that conveys sediment using air pressure is provided with a piston driven by hydraulic pressure, and the piston is used to consolidate the sediment to be transported into a plug shape. It has become.

Consolidated earth and sand are those that are pushed into the transportation pipe by a piston and then air pressure is injected to the rear to transport the plug-shaped earth and sand by the air pressure. By extruding into, continuous transportation of earth and sand is possible.

(Problems to be solved by the device) However, since the transportation speed gradually decreases due to the friction between the transportation plug-like soil and the inner surface of the transportation pipe, the conventional pneumatic pressure-feeding and discharging device has a limit of 200 m for the transportation distance. Transportation over long distances is difficult.

Also, in order to increase the amount of transportation, if a large diameter pipe is used, high pressure and a large amount of air are required.For example, when using a 10-inch transportation pipe, a pressure of 7 kg / cm ² or more and 34 Nm ² ~
Due to pressure resistance and other factors, such as requiring an air flow rate of min or more, it was almost difficult to transport a large amount of earth and sand using a transport pipe of 10 inches or more.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a transportation distance increasing device for a pneumatic pressure-feeding and discharging device that enables long-distance transportation of earth and sand.

(Means and Actions for Solving Problems) In order to achieve the above-mentioned object, the present invention consolidates earth and sand to be transported into a plug shape, pushes it out into a transport pipe, and then injects air pressure to the rear side thereof, In a pneumatic type pressure-feeding and discharging device for transporting sediment by pressure, a main body having an openable and closable gate plate opened by the sediment sent in the middle of the transportation pipe is provided, and after the sediment passes through the main body. By providing an air pressure inlet for injecting air pressure into the main body, the plug-shaped earth and sand whose speed has decreased due to friction with the inner surface of the transport pipe is accelerated again and sent out to the transport pipe, which limits the transport distance. Provided is a transport distance increasing device for a pneumatic pressure-feeding / discharging device that enables the transport of soil without a load.

At this time, when the air pressure is sent, the air is injected from above the gate plate jumping up, so that the gate plate can be surely closed.

Therefore, the compressed air does not flow back.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the state in which the earth and sand excavated by the earth pressure type shield excavator 1 for excavating underground is conveyed to the rear by the pneumatic type pressure earthing and discharging device 4, and a cutter is provided at the front part of the shield body 1a. A cutter head 1b rotated by a motor 2 is provided, and the earth and sand excavated by the cutter head 1b is taken in between the cutter head 1b and the front partition wall 1c of the shield body 1a and then shielded by the screw conveyor 3. It is conveyed to the rear of the main body 1a and dropped into the pneumatic type pressure-feeding and discharging device 4 connected to the lower portion of the rear end side of the screw conveyor 3.

The pneumatic type pressure-feeding and discharging device 4 has a piston (not shown) driven by hydraulic pressure, and pushes the earth and sand dropped from the screw conveyor 3 into the space 5 during transportation by the piston.

At that time, since the valve provided in the transport pipe 5 is closed, the plug is formed by being consolidated.

Next, a compressed air injection port 6 is provided at the stroke end position of the piston of the transportation pipe 5, and compressed air is injected from the air injection port 6 to the rear of the plug-like earth and sand extruded into the transportation pipe 5. It is supposed to be injected.

Then, when compressed air is sent after opening the valve, a compressed air layer is formed behind the plug, and the plug-like earth and sand is pushed by the pressure of this air and is conveyed backward in the transport pipe 5.

Thus, the air, the plug, the air, and the plug are intermittently conveyed.

On the other hand, in the middle of the transportation pipe 5, main bodies 8 of the transportation distance increasing device of the present invention are installed at intervals of 200 m, for example, as shown in FIG. 2, in order to extend the transportation distance.

As shown in FIGS. 3 and 4, the main body 8 has a casing 8a having a substantially U-shaped cross section, and an inlet-side connecting pipe 8b and an outlet-side connecting pipe 8b provided at the front and rear of the casing 8a. It is connected in the middle of the transportation pipe 5 by a pipe 8c.

The inside end of the casing 8a of the inlet-side connecting pipe 8b is cut obliquely, and the gate plate 9 is provided in the opening 8b so as to be openable and closable.

The upper portion of the gate plate 9 is fixed to a shaft rod 10 which is horizontally mounted on the upper portion of the casing 8a, and the opening 8d can be opened and closed by rotating around the shaft rod 10. Both ends of the shaft rod 10 are projected to the outside of the casing 8a, and a coil spring 11 is attached to one end side thereof, and an indicator 12 and a striker 13 for checking the opening angle of the gate plate 9 are attached to the other end side thereof.

The coil spring 11 biases the gate plate 9 in the closing direction, and the plug-like earth and sand carried into the main body 8 from the transport pipe 5 collides with the gate plate 9 to open it, and after the earth and sand has passed, The coil spring 11 closes the gate plate 9.

A scale plate 1 with a scale 14a near the indicator 12
4 is provided, and the opening of the gate plate 9 can be confirmed from the outside of the casing 8a by the position where the indicator 12 points the scale 14a of the scale plate 14.

The striker 13 operates the limit switch 15 as the gate plate 9 is opened and closed.

On the other hand, the upper opening of the casing 8a is closed by a flat plate-shaped lid 8e, and an air inlet 17 is installed on the lid 8e at a position above when the gate plate 9 is opened. .

Then, compressed air is supplied to the air inlet 17 by the air supply circuit shown in FIG.

Next, the operation will be described.

In FIG. 5, the main body 8 of this device is installed at an interval of, for example, 200 m from the upstream side in the middle of the transportation pipe 5 connected to the pneumatic pressure-feeding and discharging device 4, and these main bodies 8 are arranged from the upstream side.
8 ₁ , 8 ₂ , 8 ₃ , ..., 8 ₅ and a solenoid valve 19 ₁ , 19 ₂ , ......, 19 _{5 in} the middle of the pipeline 18 for supplying air pressure to these main bodies 8.
Is provided.

Before the start of the transportation, each gate plate 9 is closed, and from this state, the sand formed in a plug shape by the pneumatic pressure-feeding and discharging device 4 is provided between the transport pipes 5a.
When a limit switch (not shown) detects that the solenoid valve has passed, the solenoid valve is opened, and the air pressure is injected from the air inlet 6.

Since there is a gate just below the air inlet, the gate is closed at the same time when air is injected.

Therefore, the gate is always closed after the plug-like sediment has passed.

Therefore, the air does not flow backward to the upstream of the transport pipe 5,
Compressed air pushes the plug-like earth and sand.

And with plug-like sediment by the air pressure is conveyed through the transport tube 5 downstream, reaches the first body 8 ₁ provided in the middle of the transport tube 5, first gate plate 9 by a plug-like sediment The gate plate 9 is opened, and the gate plate 9 is closed with the passage of earth and sand.

Since the gate plate 9 is closed the striker 13 operates the limit switch 15, a signal from the limit switch 15 is solenoid valve 19 ₁ is opened the air injection inlet 17
Air is injected into the first body ₈₁ than the gate plate 9
Sediment that passes through the are transported by the air pressure thereafter until ₂ second body 8.

The gate plate 9 functions as a transportation distance increasing device, and the plug-like earth and sand that has been pressure-fed from the upstream pushes up the gate and passes through it, and air pressure is supplied with this passage. Because it closes, the supply air pressure does not flow backwards upstream, and the total air volume is supplied downstream.
The cooperative wind pressure makes it possible to pump the plug-like soil that has passed through the gate for a long distance without reducing the wind pressure for a long distance downstream.

Every time the second main body 8 ₂ and the third main body 8 ₃ are passed, the solenoid valves 19 ₂ , 19 ₃ , ... are opened and air pressure is supplied, so that the transportation pipe 5 By installing the main body 8 on the way, it becomes possible to transport the earth and sand without being restricted by the distance.

The flow chart of the above animals is as shown in FIG.

(Effect of the Invention) As described in detail above, the present invention accelerates the plug-shaped earth and sand that has slowed down due to the friction with the inner surface of the transportation pipe by the transportation distance increasing device provided in the middle of the transportation pipe, and re-transports the transportation pipe. Therefore, by installing the required number of growth devices in the middle of the transportation pipe, it is possible to transport the sediment without being restricted by the transportation distance. Even if the transportation distance is long, high-pressure and large-capacity air is not required, so there is no fear that the pumping equipment will be large and expensive, and since there is no opening in the main body, earth and sand will be scattered during transportation and noise will be generated. Since it does not occur, the working environment can be improved.

In addition, since the sediment to be transported is in a plug state, there is an advantage that the sediment can be immediately transported by a truck or the like without being scattered after being transported.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a sectional view of a shield machine, FIG. 2 is a schematic view of a transportation distance increasing device, FIG. 3 is an enlarged sectional view of the device, and FIG. FIG. 3 is an arrow view from the IV direction, FIG. 5 and FIG. 6 are operation explanatory views. 5 ... Transport pipe, 6 ... Air inlet 8 ... Main body, 8a ... Casing 8b ... Connecting pipe, 8e ... Lid body 9 ... Gate plate, 10 ... Axle rod 11 ... Coil spring, 12 ...... Indicator 13 ...... Strike, 15 ...... Limit switch 17 ...... Air inlet, 18 ...... Air pressure supply pipe 19 ...... Solenoid valve

Claims (6)

[Scope of utility model registration request] 1. A pneumatic pressure-feeding / discharging device in which soil / sand to be transported is compacted into a plug shape and extruded into a transport pipe 5, and then air pressure is injected to the rear thereof to transport the sand / sand at that pressure. A main body 8 having an openable and closable gate plate 9 which is opened by earth and sand being pressure-fed is provided in the middle of the transport pipe 5, and an air pressure inlet 17 for injecting air pressure into the main body 8 after the earth and sand has passed through the main body 8. Is provided so that the gate plate 9 is closed at the time of injecting air pressure. 2. A transport distance increasing device according to claim 1, wherein a coil spring 11 is provided at the center of opening and closing of the gate plate 9 so as to urge the gate plate 9 in a closing direction. 3. The stopper on the closing side of the gate plate 9 is a connecting pipe 8b on the inlet side, and the stopper on the opening side is a lid of the main body 8.
8. The transport distance increasing device according to claim 1, each of which is configured according to 8e. 4. A striker 13 is provided on the gate plate 9, and a limit switch 15 for detecting opening / closing of the gate plate 9 by contact of the striker 13 is provided outside the casing 8a. The transport distance increasing device according to claim 1, further comprising a solenoid valve 19 which is activated to supply compressed air by an air circuit. 5. An electromagnetic valve 19 for operating the solenoid valve 19 so as to open the air inlet 6 in response to an open signal of the limit switch 15 and for opening the air inlet 17 in response to a closing signal. The transportation distance increasing device according to item (1). 6. A shaft rod 10 for supporting the gate 9 in an openable and closable manner.
The transport distance increasing device according to claim 1, further comprising an indicator 12 for confirming the opened / closed state of the gate plate 9 from outside the main body 8.