JPH052713Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an opening/closing device for a slit for taking in earth and sand provided in the cutter face plate of a shield tunneling machine, and is particularly suitable for use in muddy water pressurized shield tunneling machines. This invention relates to an opening/closing device for an intake slit.

[Conventional technology]

Shield excavators that excavate side holes such as tunnels and pile roads use a method in which the excavated soil is taken into the chamber through a slit for taking in the earth and sand provided on the face plate of the cutter. The shield excavator is equipped with an opening/closing device that opens and closes the slit using a gate plate, and adjusts the opening degree of the slit depending on the soil quality to prevent the face from collapsing, or completely closes the slit when excavation is stopped to prevent the face from collapsing. I'm trying to prevent it from collapsing.

Conventionally, this type of slit opening/closing device has
As shown in Japanese Unexamined Patent Publication No. 57-66296, it is known that a gate plate (herein referred to as a door body) is rotated by a fluid pressure cylinder to open and close a slit. If you try to open and close the slit by moving the gate in parallel, there is a problem that malfunctions may occur if sand or pebbles get caught in the slit. A device that opens and closes is known (see Japanese Utility Model Publication No. 61-31106).

In this conventional slit opening/closing device, as shown in FIG.
A plurality of links 102 pivotally attached to 0
The rod 105 of the hydraulic cylinder 104 is connected to the rod 105 of the hydraulic cylinder 104 so as to be rotatably connected to the rod 105 of the hydraulic cylinder 104 and move diagonally laterally on the slit parallel to the slit 103 to adjust the opening degree of the slit 103. ing. Then, the rod 105 of the fluid pressure cylinder 104 is moved back and forth to move the gate plate 101 diagonally in parallel to the imaginary line position and the solid line position, thereby adjusting the weight of the gate plate 101 with respect to the slit 103. In other words, the opening degree of the slit 103 can be adjusted as desired.

[The problem that the idea attempts to solve]

By the way, since the slits provided in the cutter face plate take in excavated earth and sand as the cutter head rotates, the amount of earth and sand taken in increases toward the outer periphery. Therefore, if the width of the slit is made larger toward the outer periphery, the soil-capturing performance will be improved.

However, in the above-mentioned conventional technique in which the gate plate is moved in parallel by link motion, the gate plate 101
slit 1 by moving diagonally horizontally in parallel.
Since the slit 103 is opened and closed, the outer periphery of the slit 103 cannot be opened wider than the inner periphery. Therefore, even if the slit has a shape with a wider slit width at the outer periphery in order to improve the ability to take in soil and sand, it is impossible to completely open the outer periphery of the slit.
There is a problem in that the features of the slit cannot be taken advantage of.

The present invention improves the problems of the conventional technology as described above, and although it uses a link motion method, the movement of the gate plate is greater at the outer periphery of the slit than at the inner periphery, thereby improving the dirt intake performance. To provide an opening/closing device for a slit for taking in earth and sand in a shield excavator, which can fully open and close the slit to fully utilize the features of the slit, even in the case of a slit shape in which the slit width at the outer periphery is increased in order to improve the slit width. The purpose is to

[Means for solving problems]

In order to achieve the above-mentioned purpose, the present invention has a slit on the cutter face plate that increases the width toward the outer periphery, and a gate plate for opening and closing the slit on the back side of the cutter face plate. In the shield tunneling machine, base ends of two links of different lengths are swingably pivoted near the center of the cutter face plate, and each tip of each link is rotatably attached to the gate plate. Further, a rod of a fluid pressure cylinder swingably attached to the cutter face plate is rotatably connected to the gate plate, and when the fluid pressure cylinder is expanded and contracted, the gate plate is attached to the back side of the cutter face plate. The slit is opened and closed by performing a sliding movement based on the movement of the tips of the two links and a rotational movement based on the difference in length between the two links. do.

[Effect]

When the rod of the hydraulic cylinder is expanded and contracted, the gate plate moves along the back side of the cutter face plate in the direction of opening and closing the slit, but at this time, the gate plate is rotated through two links of different lengths. Since the gate plate moves while performing a sliding motion at the same time, the amount of movement of the gate plate is larger at the outer circumference than at the inner circumference of the slit. Therefore, even in the case of a slit shape in which the width of the slit at the outer circumference is increased, the slit can be fully opened and closed, and the slit's characteristic feature of taking in soil can be fully exhibited.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a front view showing the main parts of the opening/closing device for a slit for taking in earth and sand according to the present invention, showing the slit in an open state, and FIG. 2 showing the slit in a closed state. In the figure, a circular cutter face plate 1
A slit 2 for taking in earth and sand is provided in the radial direction. This slit 2 has a shape in which the width of the slit becomes larger toward the outer periphery in order to improve the ability to take in soil and sand. A gate plate 3 large enough to close the slit 2 is arranged on the back side of the cutter face plate 1, and the tips of two links 4 and 5 of different lengths are rotated by pins 6 and 7 on this gate plate 3. freely connected. The base ends of the links 4 and 5 are pivoted near the center of the cutter face plate 1 by pins 8 and 9 so as to be swingable. And the gate plate 3
is capable of moving in the direction of opening and closing the slit 2 while performing rotational movement and sliding movement simultaneously through a long link 4 that swings about the pin 8 and a short link 5 that swings about the pin 9. It's summery. The base of a hydraulic cylinder 10 is swingably attached to the cutter face plate 1 by a pin 11, and the rod 10a of the hydraulic cylinder 10 is connected to an intermediate position of the gate plate 3 by a pin 12.

In the above embodiment, when the rod 10a of the hydraulic cylinder 10 is contracted, the gate plate 3 moves to the position where the slit 2 is opened, as shown in FIG. 1, and when the rod 10a of the hydraulic cylinder 10 is extended, the second As shown in the figure, the gate plate 3 has slits 2
Move to the closed position. When opening and closing the slit 2 with this gate plate 3, the gate plate 3 moves while simultaneously performing a rotational movement and a nearly parallel sliding movement via links 4 and 5 of different lengths.
The amount of movement of the gate plate 3 is larger at the outer periphery of the slit than at the inner periphery. Therefore, even in the case of the slit 2 in which the width of the slit at the outer circumferential portion is increased as shown in the figure, the slit 2 can be fully opened and completely closed, and the feature of the slit 2, which is the ability to take in dirt, can be fully exhibited. In addition, the fluid pressure cylinder 10
By adjusting the stroke of the rod 10a, the weight of the gate plate 3 relative to the slit 2, that is, the opening degree of the slit 2 can be adjusted as desired. Moreover, even in this state, the opening of the slit 2 is larger at the outer circumference than at the inner circumference, that is, the opening is suitable for taking in soil and sand. Furthermore, since the link motion is adopted, the movement of the gate plate 3 is reliable, and malfunctions such as stopping due to sand, pebbles, etc. being caught in the gate plate 3 are less likely to occur.

[Effect of idea]

According to the present invention, although it is a link motion type slit opening device, the amount of movement of the gate plate is made larger at the outer circumference than at the inner circumference of the slit. Even in the case of a slit shape in which the slit width is increased as the width increases, the slit can be fully opened and closed, and the features of the slit can be fully utilized.

[Brief explanation of the drawing]

1 and 2 are front views showing the main parts of the opening/closing device for the slit for soil and sand intake according to the present invention. FIG. 1 shows the slit in an open state, and FIG. 2 shows the slit in a closed state. FIG. 3 is a front view showing the main parts of a conventional slit opening/closing device. 1... Cut face plate, 2... Slit, 3... Gate plate, 4, 5... Link, 6, 7, 8, 9...
Pin, 10...Fluid pressure cylinder, 10a...Rod, 11, 12...Pin.

Claims (1)

[Scope of utility model registration request] A shield excavator in which a cutter face plate has a slit for taking in soil whose width increases toward the outer periphery, and a gate plate for opening and closing the slit by a link method is disposed on the back side of the cutter face plate. The base ends of two links of different lengths are pivotally attached near the center, and the tips of each link are rotatably connected to the gate plate, and the base ends of the links are rotatably connected to the cutter face plate. A rod of a fluid pressure cylinder mounted so as to be swingable is rotatably connected to the gate plate, and when the fluid pressure cylinder is expanded and contracted, the gate plate is attached to the tips of the two links along the back surface of the cutter face plate. Sliding motion 2 based on the movement of
1. An opening/closing device for a slit for taking in earth and sand in a shield excavator, characterized in that the slit is opened and closed by performing a rotational movement based on a difference in length between the links.