JPH0730796Y2 - Screw conveyor for earth removal in shield excavator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw excavating screw conveyor in a shield excavator suitable for excavating highly viscous ground such as clay layers.

[0002]

2. Description of the Related Art Excavated soil excavated by the rotation of a cutter plate is taken into a take-in chamber between a cutter plate and a partition wall which rotatably supports the cutter plate, and the excavated soil in the take-in chamber is rearward in the machine. It has been generally practiced that the discharge is performed by a screw conveyor in which the front end opening penetrates the lower part of the partition wall to face the inside of the receiving chamber. However, if the excavated soil is clay or other highly viscous soil,
The excavated soil is discharged in a continuous state from the soil discharge port formed on the peripheral wall surface of the rear end portion of the screw conveyor casing, and it becomes difficult to carry the excavated soil to a certain amount.

[0003]

For this reason, it has been practiced to fix a rod-shaped object in a erected state in the earth discharging port or to attach a clay cutter, but in the former rod-shaped object, excavated soil is discharged. Even if it can be divided in a certain direction, it is not only difficult to cut it at a fixed length of soil discharge, but also the presence of the rod-shaped object increases the soil discharge resistance from the soil discharge port, resulting in smooth discharge. There is a risk that the bar will be obstructed by the soil and that the bar-like material will be damaged by the earth pressure. On the other hand, when the clay cutter is newly installed as in the latter case, the entire apparatus becomes large, and it is difficult to secure the equipment space in the small diameter shield excavator. An object of the present invention is to provide a screw conveyor for earth removal in a shield excavator that can completely eliminate such problems.

[0004]

In order to achieve the above object, the earth excavating screw conveyor in the shield excavator of the present invention excavates between a cutter plate 2 and a partition wall 3 rotatably supporting the cutter plate 2. In the screw conveyor 6 that discharges the viscous excavated soil from the soil intake chamber 5 into the machine, the screw conveyor 6 is disposed in the casing 6a so as to face the soil discharge port 9 that is opened in the rear end peripheral wall of the casing 6a. Front and rear blades at the rear end of the installed rotary screw blade 7.
It has a structure in which a bar body 10 for cutting excavated soil is attached in a erected state between the outer peripheral edges of 7a, 7a.

[0005]

The viscous excavated soil such as clay excavated by the cutter plate 2 is taken into the excavated soil intake chamber 5 on the back side of the cutter plate 2, and then the screw opening at the lower part of the intake chamber 5 is used. It is taken into the conveyor 6, conveyed backward by the rotation of the screw blades 7, and discharged from the soil discharge port 9.
At this time, the rod 10 installed between the outer edges of the adjacent front and rear blades at the rear end of the screw blade 7 is moved in a direction orthogonal to the earth discharging direction from the earth discharging port 9 by the rotation of the screw blade 7. The excavated soil that is moved and is forcibly and continuously discharged by the rotation of the screw blade 7 toward the soil discharge port side is cut by the rod body 10 at a constant length each time the screw blade 7 rotates.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
Reference numeral 1 is a shield excavator, in which a clay-shaped circular cutter plate 2 for excavating ground is provided at the front end of the opening of the skin plate 1a, and a rotary shaft 2a of the cutter plate 2 is stretched in the front end portion of the skin plate 1a. The partition wall 3 is rotatably supported, and the cutter plate 2 is rotated by a motor 4 arranged on the back side of the partition wall 3. Reference numeral 5 denotes an excavated soil intake chamber formed in a space between the facing surfaces of the cutter plate 2 and the partition wall 3.

Reference numeral 6 denotes a screw conveyor arranged in the shield excavator 1 on the rear side from the partition wall 3, and a screw blade 7 is provided in a cylindrical casing 6a over the entire length of the casing 6a. The central shaft 7b is rotated by a motor 8 mounted on the rear end surface of the casing 6a. Further, in this screw conveyor, the front end opening portion of the casing 6a is connected to the partition wall 3
It penetrates through the lower end of the and faces the excavated soil intake chamber 5,
It is installed in the machine in a state of being inclined obliquely upward from the front end to the rear end.

Further, the casing of the screw conveyor 6
On the lower peripheral side of the rear wall of the rear end of 6a, a soil discharge port 9 of an appropriate size is provided.
Has been established. Further, at the rear end of the screw blade 7 facing the soil discharge port 9, a bar 10 for excavating soil is attached in a erected state between the outer peripheral edges of the blade portions 7a, 7a adjacent to each other in the front and rear.

The number of such rods 10 is not limited to one as shown in the figure, but several rods may be attached in the spiral direction at appropriate intervals. Further, the rod body 10 may be integrally fixed at its both ends to the blade portions 7a, 7a by welding or the like, but a fitting for mounting the rod body 10 on the outer peripheral edge portion of the opposing blade portions 7a, 7a (see FIG. It is desirable to fix (not shown), and to attach both ends of the rod 10 to this mounting bracket in a detachable manner.

Reference numeral 11 denotes a casing of the screw conveyor 6.
It is an inspection window provided on the upper peripheral wall of 6a. 12 is the casing
6a is a cylinder arranged at a proper position on the lower peripheral wall portion, and an opening / closing gate 13 for the soil discharge port 9 is attached to the tip of the rod.
Reference numeral 14 is an excavated soil unloading belt conveyor, the unloading starting end side of which faces the lower side of the soil discharge port 9 of the screw conveyor 6 and the unloading ending side of the trolley 16 which runs on a rail 15 laid in the tunnel. Is facing. Reference numeral 17 denotes a propulsion jack, which pushes the rod end against the front end face of the segment lining 18 to propel the shield excavator 1.

With this construction, when the shield excavator 1 is moved forward by the operation of the propulsion jack 17 while rotating the cutter plate 2, the highly viscous excavated soil such as clay excavated by the cutter plate 2 is removed by the cutter. It is taken into the intake chamber 5 from the slit portion provided in the plate 2. Further, the excavated soil in the intake chamber 5 is taken into the casing 6a by the rotation of the screw blades 7 of the screw conveyor 6,
It is transported to the rear and fills the casing 6a.

When the gate 13 is opened when the excavated soil is discharged from the casing 6a into the machine, the excavated soil in the casing 6a is forcibly pushed out from the soil discharge port 9 by the rotational pushing force of the screw blades 7. At this time, screw blade 7
The rod 10 installed between the outer peripheral edges of the front and rear blades 7a, 7a at the rear end portion moves in a direction traversing the soil discharging port 9 by the rotation of the screw blade 7 and continuously from the soil discharging port 9. The viscous excavated soil is discharged into the block 19 with a constant length and a fixed amount for each rotation of the screw blade.

A certain amount of the massive excavated soil 19 thus sequentially discharged from the soil discharge port 9 falls on the belt conveyor 14, is conveyed to the standby position of the carriage 16 by the belt conveyor 14, and is thrown into the carriage 16. It is discharged through the tunnel.

[0014]

As described above, according to the screw conveyor for earth removal in the shield excavator of the present invention, the cutter plate 2
In the screw conveyor 6 for discharging the viscous excavated soil into the machine from the excavated soil intake chamber 5 between the partition walls 3 rotatably supporting the cutter plate 2, the casing 6a of the screw conveyor 6 is opened at the peripheral wall of the rear end portion thereof. A rod 10 for cutting excavated soil is installed between the outer peripheral edges of the front and rear blades 7a, 7a at the rear end of the rotary screw blade 7 disposed in the casing 6a so as to face the earth discharging port 9 Since it is attached in a state, the structure is extremely simple, and since the excavated soil cutting rod 10 is arranged in the casing 6a of the screw conveyor 6, no space for equipment is required. Therefore, it is suitable for a small-diameter shield excavator and can be sufficiently secured in terms of safety.

Further, since the excavated soil cutting rod 10 is mounted between the outer peripheral edges of the front and rear blades 7a, 7a at the rear end of the rotary screw blade 7, it is ejected by the rotation of the screw blade 7. The viscous excavated soil that moves in a direction traversing the soil mouth 9 and is continuously extruded from the screw blade 7 toward the soil discharge outlet 9 is smoothly and surely made to have a constant length with each rotation of the screw blade 7. Can be cut,
The work of discharging the viscous excavated soil can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a simplified sectional view of a shield excavator equipped with a screw conveyor,

FIG. 2 is a side view in which a part of a main part of the screw conveyor is cross-sectioned,

FIG. 3 is a vertical sectional front view of a screw blade portion provided with a rod body for cutting excavated soil.

[Explanation of symbols]

 1 Shield Excavator 2 Cutter Plate 3 Partition 5 Excavation Soil Intake Chamber 6 Screw Conveyor 6a Casing 7 Screw Blade 7a Blade 9 Discharge Port 10 Drilling Soil Cutting Rod

Claims (1)

[Scope of utility model registration request] 1. A screw conveyor 6 for discharging viscous excavated soil into a machine from an excavated soil intake chamber 5 between a cutter plate 2 and a partition wall 3 rotatably supporting the cutter plate 2, and a casing of the screw conveyor 6. Excavation is made between the outer peripheral edges of the front and rear blades 7a, 7a at the rear end of the rotary screw blade 7 disposed inside the casing 6a so as to face the soil discharge port 9 opening in the rear wall of the rear end of 6a. A soil excavating screw conveyor in a shield excavator, characterized in that a soil cutting rod (10) is attached in a erected state.