JPS5822632B2 - Face water pressure control method and device for shield excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a face water pressure control method and apparatus for a muddy shield excavator.

Conventionally, excavator face water pressure control devices manually or automatically control the opening and closing of water pipe valves in the excavator, or control the rotation of ground water pumps, in response to fluctuations in face water pressure. In either case, there were problems with fluctuating face water pressure at the start and end of excavation and followability problems, making precise control impossible.

The control method of the present invention transmits the flow rate value indicated by the flow meter of the water pipe to the flow rate indicating controller, and controls the amount of water conveyed at the upper end of the water pipe using a signal based on the deviation between the set flow rate of the flow rate indicating controller and the flow rate measurement value of the flow meter. and the water supply valve of the water supply pipe inside the excavator, and further transmits the water pressure value of the face water pressure transmitter to the water pressure indicating controller, and the signal of the deviation between the set water pressure of the water pressure indicating controller and the water pressure of the face is sent to the water pressure of the sludge pipe. The purpose of this system is to transmit fluctuations in water pressure at the face to the sludge valve and one variable speed pump, and to the variable speed pump in the sludge pipe, the water valve and controller in the water pipe to stabilize the water pressure at the set level in a short period of time.

In addition to controlling the water pressure at the face during excavation as described above, the control device of the present invention is equipped with a switch for turning off bypass operation, and is further provided with a water pressure transmitter in the water supply pipe near the bypass pipe behind the water supply valve, and a water pressure indicating controller. By connecting the flowmeter of the sludge pipe to the flow rate indicator controller, fluctuations in face water pressure can be rapidly stabilized not only during excavation, but also during bypass operation, and safe bypass operation has been made possible. It is something.

An embodiment of the face water pressure control method of the present invention will be explained using the apparatus shown in FIG.
A water pipe 5 for opening the sludge drain pipe 6 is provided with a water supply valve T and an above-ground water supply controller such as a control valve, a constant speed pump or a variable speed pump 8, and a flow meter 9 close to the bulkhead 3, The sludge pipe 6 includes a sludge valve 10, a variable speed pump 11 for sludge removal, and a flow meter 1.
2, and the water pipe 5 and the sludge pipe 6 are respectively connected to the above-ground storage tank 1.
Contact 3.

The water pressure transmitter 14 that measures and transmits the water pressure in the water pressure chamber 4 provided with the partition wall 3 is connected to the water pressure indicating controller 15 at the face, and the water pressure indicating controller 15 is used to adjust the set water pressure and the pressure from the water pressure transmitter 14. Variable speed pump 1 with deviation connected via electric wire 16
Tell 1.

Further, the flow rate value of the flow meter 9 is transmitted to a flow rate indicating controller 18 connected via an electric wire 11, and the flow rate indicating controller 18 receives the set flow rate value and the measured value of the flow meter 9.

The deviation is transmitted to the water supply valve 1 and the water supply controller 8, and the water supply pipe 5
Control the flow rate within.

19 is a bypass pipe, and 20 is a segment.

When excavating with an excavator in the device, if the water pressure at the face increases, the water pressure transmitter 14 and the water pressure indicator/indication controller 15 are activated.
The rotation of the variable speed pump 11 is increased through these steps, and the face water pressure is suddenly reduced to normal pressure.

Once the water pressure at the face increases, the flow rate of water in the water pipe suddenly decreases. The flow rate is increased to the set flow rate by the water valve 1 and the variable speed pump 8 based on the signals from the flowmeter 9 and the flow rate indicator controller 18. This makes it possible to prevent a sudden drop in the face pressure due to an increase in the rotation of the variable speed pump 11.

If the face water pressure drops during excavation, the variable speed pump 11
In response to the increase in the water supply flow rate due to the pressure drop, the water supply valve and the variable speed pump act to return the water supply flow rate to the set flow rate, and the water pressure at the face increases rapidly due to the decrease in the rotation of the variable speed pump 11. can be prevented.

The signal from the water pressure indicator controller 12 is sent not only to the variable speed pump 11 but also to the sludge valve 10, and the sludge valve 10 is also opened and closed when the face water pressure is controlled.

Note that the controller (not shown) of the variable speed pump 8 and the control valve 22, which will be described later, have the same function.

The face water pressure control device of the present invention is designed to be compatible with the excavator during excavation work and during the suspension of excavation. ,
The water pump 21 on the ground rotates at a constant speed, and the water pipe 5 connected to the pump 21 is provided with a branch pipe 23 equipped with a control valve 22.
The water supply valve 1 is installed near the face, and the control valve 22 is connected to the pump 2 on the ground.
1, and the water flow rate can be adjusted in two stages.

A water pressure transmitter 24 is provided in the water supply pipe 5 near the bypass pipe 19 behind the water supply valve γ, and the water pressure indicating controller 15 is connected to the switch S1.
and 82 to the hydraulic transmitters 14 and 24, respectively;
Switch Sl is closed during excavation, and switch S2 is closed during bypass operation.

The input side of the flow rate indicator controller 18 is connected to the water pipe flow meter 9 and the mud removal pipe flow meter 12 via switches S3 and 84, respectively, and the switch S3 is closed during excavation and the switch is closed during bypass operation. Close s4.

S3 is a switch on the electric wire that connects the flow rate indicator adjustment 18 and the water supply valve T, and is used to energize during excavation.

This control device is controlled in the state shown in Fig. 1 during excavation.During the bypass operation performed at the start and end of excavation, the water supply valve γ is slightly opened to maintain the water pressure at the face, and the bypass valve 25 is opened, and the variable speed pump 11 is opened. is controlled by the water pressure transmission pipe 24 of the water pipe and the pressure indicating regulator 15, and the flow rate of the bypass pipe 19 is controlled by the flow meter 12 and the flow rate indicating regulator 18, which controls the control valve 2.
2 is controlled.

As described above, according to the control method of the present invention, the pressure in the face hydraulic chamber is controlled not by the water pump installed on the ground as in the past, but by the mud removal valve and mud removal pump near the bulkhead of the shield excavator. Therefore, control 1 is large, and if a deviation occurs between the pressure in the face water pressure chamber and the set pressure, the face water pressure can be immediately restored to the set pressure regardless of the size of the deviation, resulting in good responsiveness. In other words, the time lag from pressure detection in the face hydraulic chamber to pressure control in the chamber can be extremely minimized even when the excavator continuously excavates hundreds to thousands of meters, making highly accurate TJIs possible. Furthermore, the sudden drop or sudden drop in water pressure at the face that occurs during the pressure control is transmitted to the water supply valve and water supply pump via the flowmeter and flow rate indicator controller, and the valve and pump ensure that the water supply flow rate is returned to the set flow rate. can be prevented.

Furthermore, according to the control device of the present invention, it is possible to stabilize the pressure in the face water pressure chamber by bypass operation at the start and end of excavation, and therefore, fluctuations in the face water pressure can be prevented not only during excavation but also at the aforementioned times. This method has excellent effects such as being able to reliably prevent the above, and to provide highly accurate and highly safe control.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an excavator for carrying out the method of the present invention;
FIG. 2 is a layout diagram of the control mechanism of the excavator. 1... Excavator body, 3... Bulkhead, 5... Water pipe,
6... Sludge drain pipe, γ... Water supply valve, 8, 21... Water supply pump, 10... Sludge drain valve, 11... Sludge pump, 9
, 12...Flowmeter, 14.24...Water pressure transmitter, 1
5...Water pressure indicating controller, 18...Flow rate indicating controller,
19... Bypass pipe, 22... Control valve.

Claims (1)

[Scope of Claims] 1. The pressure in the face water pressure chamber is detected by a water pressure transmitter installed on the bulkhead of the shield excavator, and this detection signal is transmitted to a water pressure indicating controller, and this controller reads the set pressure and the water pressure transmitter. The deviation from the pressure indicated by The flow meter detects the flow rate. This detection signal is transmitted to the flow rate indicating controller, and this controller detects the deviation between the set flow rate and the flow rate indicated by the flow meter. A face water pressure control method for a shield excavator, characterized in that the flow rate of water is increased or decreased according to the deviation by transmitting the information to a water pump installed in a water pipe adjacent to a storage tank installed outside the mine. 2. A shield excavator face water pressure control method. The water supply valve installed near the bulkhead and the
a water supply pipe having a flow meter; a mud discharge pipe having a mud discharge valve and a second flow meter; and a water supply pipe between the mud discharge valve and the second flow meter of the mud discharge pipe and the water supply pipe. a bypass pipe equipped with a bypass valve connecting the valve and the first flowmeter; a first water pressure transmitter provided with a water supply pipe near the bypass pipe; A second water pressure transmitter for detection, a sludge pump provided on a sludge pipe near the bulkhead, and a water pump control valve provided on a water pipe near a storage tank installed outside the excavation pit. , the first water pressure transmitter and the second water pressure transmitter are each switchably connected to a water pressure indicating controller, the controller is connected to the sludge pump, and the first water pressure transmitter is
A flow meter and a second flow meter are each switchably connected to a flow rate indicating controller, and this controller is connected to the water supply valve and the control valve, and the water pressure indicating regulator is connected to the first water pressure transmitter or Upon receiving the pressure signal detected by the second water pressure transmitter, the deviation between this pressure and the set pressure is transmitted to the self-sludge removal pump, and the sludge removal flow rate is increased or decreased according to this deviation. The system is configured to receive a flow rate signal detected by a first flow meter or a second flow meter, transmit a deviation between this flow rate and a set flow rate to the water supply valve and the control valve, and increase or decrease the water supply flow rate according to this deviation. A face water pressure control device for a shield excavator.