JPH036712Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a discharge valve structure for opening and closing the injection material discharge port of the injection material supply device in a shield excavation machine. The present invention relates to a discharge valve structure of an injection material supply device in a shield excavator that can reliably discharge and supply injection material.

In shield excavators, in order to improve the properties of the excavated soil excavated from the face and prevent collapse of the face, injection materials such as viscous material and water are applied to the main body of the shield excavator, such as the cutter face plate, bulkhead, or shield frame. Some are equipped with an injection material supply device that injects the injection material into the face. 1 to 4 show a conventional discharge valve 9 that is provided facing the face 5 side in an injection material supply device.

In the figure, 1 is a cutter ace of a shield tunneling machine, and a cylindrical valve block 2 is attached to the cutter ace 1.
A spool 4 is slidably provided in the insertion hole 3. The spool 4 has a mushroom shape in which the diameter of the tip 4a on the face 5 side is gradually expanded into a conical shape, and the tip of the insertion hole 3 is also enlarged so as to accommodate the tip 4a of the spool 4. . A coil spring 6 is interposed between the base end of the spool 4 and an annular protrusion 2a protruding from the center of the inner peripheral surface of the valve block 2. It works in the direction of always bringing the tip 4a into contact with the metal touch surface 2a on the inner peripheral surface of the tip of the insertion hole 3. The spool 4 is also formed with an injection hole 7 for guiding the injection material by penetrating its interior from its base end surface to the rear side surface of the distal end 4a.The injection hole 7 at the base end of the spool 4 has an injection material injection nozzle 8
is inserted.

FIG. 1 shows a state in which the discharge valve 9 is closed,
Further, FIG. 2 shows a state in which the discharge valve 9 is opened. In FIG. 1, the injection material is not injected from the injection material injection nozzle 8, and the tip end 4a of the spool 4 is pressed against the metal touch surface 2a by the force of the coil spring 6.
is in face-to-face contact. On the other hand, in FIG. 2, the injection material is injected into the injection hole 7 from the injection material injection nozzle 8, and due to the pressure, the spool 4 slides toward the face 5 side while compressing the coil spring 6, and the tip end 4a is spaced apart from the metal touch surface 2a, and the tip portion 4
The face 5 passes through the gap between a and the metal touch surface 2a.
The injection material is being discharged to the side. This discharge valve 9 prevents excavated earth and sand from entering the inside of the insertion hole 3.
The tip 4 of the spool 4 is moved by the force of the coil spring 6.
This is prevented by sealing the metal touch surface 2a by bringing it into contact with the metal touch surface 2a.

However, with such a sealing method, as shown in FIG. 3, dirt m is likely to get caught between the metal touch surface 2a and the tip 4a. Once it is bitten, the force of the coil spring 6 causes the spool 4 to
Even if you try to close it, it will not close, and dirt m will enter from the outside through the gap between the metal touch surface 2a and the tip 4a, and the dirt m will enter the space of the insertion hole 3, as shown in Fig. 4. . Once the earth and sand m have entered and solidified, it is difficult to remove the inflowing earth and sand with the pressure of the injection material, and it becomes impossible to supply the injection material. ). Furthermore, since the gap formed between the metal touch surface 2a and the tip 4a is narrow and the cross section through which the injection material passes is narrowed, it is difficult for the earth and sand that has entered the inside of the insertion hole 3 through this gap to be discharged. Easy to get clogged with earth and sand. In addition, the flow rate of the injection material through the minute gap between the metal touch surface 2a and the tip 4a is very fast.
There is a problem that the metal touch surface 2a and the tip portion 4a surface are damaged by the injection material, and the sealing performance thereof is likely to deteriorate.

The present invention was devised to effectively solve the above-mentioned conventional problems, and the purpose of the present invention is to prevent the injection material discharge port from becoming clogged with inflowing sediment,
It is an object of the present invention to provide a discharge valve structure of an injection material supply device in a shield excavator, which can reliably discharge and supply injection material to the face side.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

5 and 6, 10 is a cylindrical shield frame, and a cutter frame 11 is rotatably provided at the front end of the shield frame 10 by a cutter bearing 12. A radial slit 14 is formed in the cutter face plate 13 on the front surface of the cutter frame 11, and spokes 15 are spanned over the slit 14 in the radial direction from the center of the cutter face plate 13. Katsutabit 1 for spoke 15
6 is attached, and a discharge valve 17 according to the present invention is also provided. The shield frame 10 is connected to the cutter frame 11 via a gear, and is provided with a cutter frame drive motor 18 for rotationally driving the cutter frame 11. Further, a propulsion jack 19 is attached to the shield frame 10 for propelling the shield tunneling machine toward the face. Note that 20 is a segment.

7 and 8, the discharge valve 17 attached to the spoke 15 is shown enlarged. Discharge valve 1
7 has a bottomed cylindrical valve casing 21 attached to the spoke 15 with its opening 21a facing the face F side, and a side wall on the opening 21a side at the tip of the valve casing 21 is filled with injection material. An injection material discharge port 22 for discharging and supplying the injection material is formed. A piston or plunger-shaped valve body 23 is slidably fitted into the cylindrical valve casing 21 . A valve body 2 is provided at the base end of the valve casing 21.
Hydraulic oil chamber 24 for reciprocating 3 by hydraulic pressure
is formed. Further, on the outer peripheral side of the base end of the valve body 23, there is an annular ring for liquid-tightly partitioning the hydraulic oil chamber 24 into two chambers: a front chamber 24a on the face F side and a rear chamber 24b on the base end side of the valve casing 21. A protrusion 23a is formed.

In addition, the front chamber 24a or the rear chamber 2 of the hydraulic oil chamber 24
4b, hydraulic oil supply and discharge ports 25, 2 are provided on the side wall of the valve casing 21 near the face F of the hydraulic oil chamber 24 or near the base end of the valve casing 21.
6 are provided respectively. Hydraulic oil supply/discharge port 2
5 and 26 have hydraulic oil supply and discharge nozzles 27 and 26, respectively.
28 are arranged in series, and hydraulic oil supply and discharge pipes 29 and 30 are connected to the supply and discharge nozzles 27 and 28. Further, an injection material injection nozzle 31 for injecting and supplying injection material to the injection material discharge port 22 is also connected to the injection material discharge port 22, and an injection material supply pipe 32 is connected to the injection material injection nozzle 31.
is connected. As shown in FIG. 6, the injection material supply pipe 32 and the hydraulic oil supply and discharge pipes 29, 30 are provided inside the cutter chamber 33, protected by a protection pipe 34, passed through a bulkhead 35, and placed inside the shield frame 10. , are connected to the injection material supply pipe 32 and the hydraulic oil supply and discharge pipes 29 and 30 on the stationary side via a rotary joint 36, respectively.

As shown in FIG. 9, the injection material supply pipe 32 on the fixed side includes an injection material delivery pump 37, a motor 38 that drives the pump 37, and a relief valve 39 that controls the injection material discharge pressure to a constant value. An injection material delivery pump unit 40 mainly composed of is connected thereto. Further, the fixed side hydraulic oil supply and drain pipes 29 and 30 include a hydraulic oil supply pump 41, a motor 42 that drives the pump 41, and a relief valve 43 that controls the supplied hydraulic pressure to a constant value. A valve body actuating pump unit 45 is connected, which mainly includes an electromagnetic switching valve 44 for supplying hydraulic oil to either one of the hydraulic oil supply/discharge pipes 29, 30. Furthermore, the injection material supply pipe 32 is provided with a discharge pressure detector 46 . The detector 46 and the solenoid of the electromagnetic switching valve 44 are electrically connected, and the electromagnetic switching valve 44 is operated by a detection signal from the detector 46. In addition, in the discharge valve 17 shown in FIGS. 7 and 8, 47 and 47 are oil seals 4.
7, and 48 is a dust seal.

Next, the operation of this embodiment will be described.

The cutter frame 11 is rotationally driven by the operation of the cutter frame drive motor 18, and the cutter face plate 1
The face is excavated by a cutter bit 16 attached to the spoke 15 of No. 3. Then, the injection material is appropriately supplied from the discharge valve 17 into the excavated earth and sand.

FIG. 7 shows a state in which the discharge valve 17 is closed. That is, hydraulic oil is supplied from the hydraulic oil supply/discharge port 26 to the rear chamber 24b of the hydraulic oil chamber 24 (the front chamber 2
The oil 4a is discharged from the hydraulic oil supply/discharge port 25. ),
The valve body 23 moves to the face F side, and the injection material discharge port 22 is closed by the valve body 23. The space on the opening 21a side of the valve casing 21 facing the face F side is the space where the valve body 2
3, excavated earth and sand cannot enter into the valve casing 21. In addition, a stopper portion 23b with an enlarged diameter is provided at the base butterfly portion of the valve body 23.
is formed, and when this stopper portion 23b comes into contact with the end surface of the face F of the hydraulic oil chamber 24, the valve body 2
3's movement toward the face F side is restricted.

On the other hand, the injection material is injected from the discharge valve 17 into the face F in the following manner. First, the injection material is pumped from the injection material delivery pump 37 to the injection material supply pipe 32 by the operation of the motor 38 of the injection material delivery pump unit 40 . The pressure of the injection material within the injection material supply pipe 32 is detected by a discharge pressure detector 46 . When this pressure value is equal to or higher than a predetermined pressure, the detector 46 sends a signal to the switching valve 44 in order to switch the electromagnetic switching valve 44 so that the discharge valve 17 is opened by the hydraulic pressure discharged from the hydraulic oil supply pump 41. A detection signal 49 is sent. Then, hydraulic oil is supplied from the hydraulic oil supply/discharge port 25 to the front chamber 24a of the hydraulic oil chamber 24 (the oil in the rear chamber 24b is returned to the hydraulic oil supply/discharge pipe 30). When hydraulic oil is supplied to the front chamber 24a, the pressure causes the valve body 23 to move toward the base end of the valve casing 21, and as shown in FIG. 21 is returned to the end surface on the proximal end side. As a result, the injection material discharge port 22 is opened, and the injection material is injected into the valve casing 21, and further ejected and supplied to the face F side from the opening 21a.

During injection when the injection material is being injected from the injection material discharge port 22, or after injection is stopped and before the valve body 23 is moved to the face F side again and the injection material discharge port 22 is closed, there is no fluid inside the valve casing 21. Excavated soil flows into the area. However, the inflowing earth and sand in the valve casing 21 is pushed out by the movement of the valve body 23 toward the face F when the discharge valve 17 is closed, and is swept out to the face F. In this way, the present invention provides the discharge valve 17
It has an automatic sweep function that automatically pushes out dirt that has entered the valve casing 21 by the piston-shaped valve body 23 when the valve body is closed. Since it is a removal method, the inflowing earth and sand in the valve casing 21 can be forcibly and accurately removed. Therefore, there is no fear that the injection material discharge port 22 will be clogged with inflowing earth and sand, and the injection material can be reliably supplied to the face F. Also, instead of sealing with a metal touch as in the past, the valve body 23 is attached to the valve casing 2.
1 is a sliding structure that seals the intrusion of earth and sand, so no earth and sand gets caught in it, making it suitable for long-term use.

Moreover, since the opening cross section on the face side of the valve casing 21 is constant, the earth and sand that have flowed into the valve casing 21 are easily discharged. Furthermore, unlike the above-mentioned conventional method in which the spool 4 protrudes toward the face side and the injection material is injected, the valve body 23 is attached to the valve casing 21.
Since the injection material is discharged when the valve body 23 is pulled down toward the proximal end, the distal end portion of the valve body 23 is not damaged by dirt or the like. Further, the discharge valve 17 is opened when the injection material discharge pump 37 is operating.
The pressure of the injection material is detected by the discharge pressure detector 46 (or the rotation of the pump 37 may be detected),
Since the operation of the injection material delivery pump 37 and the opening of the delivery valve 17 are electrically linked, the delivery valve 17 may open by mistake when the injection material is not being sent from the injection material delivery pump 37, causing the valve to open. Earth and sand can be prevented from being forced into the casing 21 from the face F side.

In the above embodiment, the valve body 23 is driven reciprocally by hydraulic pressure, but it may be driven by other fluid pressures such as water pressure or air pressure. Further, in the embodiment described above, the discharge valve 17 is both opened and closed by hydraulic pressure, but one of the valve opening and closing may be performed by spring force, and the other by hydraulic pressure (fluid pressure). Further, the cross section of the valve body 23 fitted into the valve casing 21 is not limited to a circular shape, but may be square or oval, as long as it can slide in close contact with the valve casing 21. Further, although the discharge valve 17 is installed on the cutter face plate 13 in the illustrated example, it can of course be installed anywhere on the excavator as long as the injection material can be injected into the face F. . Further, although the shield tunneling machine of the above embodiment is of a peripheral support type, it is of course applicable to a center shaft type or the like.

In summary, the present invention exhibits the following excellent effects.

(1) The injection material discharge port will not be clogged by inflowing earth and sand, and the injection material can be reliably discharged and supplied to the face.

(2) It is highly durable and easy to manufacture, and can be easily adapted to existing shield excavators.

[Brief explanation of the drawing]

Figures 1 to 4 are side sectional views of a discharge valve of a conventional injection material supply device, respectively, with Figure 1 showing the discharge valve in a closed state and Figure 2 in an open state. 3 shows a state in which the discharge valve is filled with dirt, and FIG. 4 shows a state in which the discharge valve is clogged with dirt. Figure 5 is a front view of a shield tunneling machine equipped with the discharge valve according to the present invention, Figure 6 is a side sectional view of the same machine, and Figure 7 is an enlarged view of the discharge valve in Figure 5 showing the closed state. FIG. 8 is a longitudinal sectional view showing the discharge valve in an open state, and FIG. 9 is a circuit diagram of a supply system for injection material and hydraulic pressure. In the figure, 10 is a shield frame, 11 is a cutter frame, 13 is a cutter face plate, 17 is a discharge valve, 2
1 is a valve casing, 22 is an injection material discharge port, 23 is a valve body, 24 is a hydraulic oil chamber, 29 and 30 are hydraulic oil supply and discharge pipes, 32 is an injection material supply pipe, 36 is a rotary joint, 37
40 is an injection material discharge pump, 41 is a hydraulic oil supply pump, 44 is an electromagnetic switching valve, 45 is a pump unit for operating a valve body, 46 is a discharge pressure detector, and F is a face.

Claims (1)

[Scope of utility model registration request] A discharge valve that opens and closes an injection material discharge port for injecting injection material from a shield tunneling machine into a face, comprising: a cylindrical valve casing that is opened facing the face; and a side wall on the side of the opening at the tip of the casing; an injection material discharge port formed in the valve casing, and a piston-shaped piston that is slidably fitted into the valve casing and is reciprocated by hydraulic pressure to open and close the injection material discharge port and to sweep out dirt flowing into the valve casing. A discharge valve structure of an injection material supply device in a shield excavator, characterized by comprising a valve body.