JPS592236Y2 - Sediment removal device for shield excavator - Google Patents

Description

[Detailed explanation of the invention] During excavation work using a shield excavator, the earth and sand taken into and filled into the earth and sand intake chamber has a shear strength unique to the soil, and at the same time prevents the movement and flow of earth. There is a part on the wall of the intake chamber where it accumulates in an arch shape and cannot be discharged.

By the way, as a means to prevent this kind of situation, conventional methods have been used to actively crush the arch-shaped adhesion phenomenon by increasing the shield thrust force and increasing the amount of uptake in the excavation, but this method has no aesthetic effect. Not only does it require a large amount of thrust, but if it is propelled with a large amount of thrust, there will be negative effects such as ground uplift.
Problems also arise with equipment thrust, etc.

Another method is to attach a baffle plate to the auger shaft or the inner surface of the cutter desk in the soil intake chamber and use the rotation of the baffle plate to crush the excavated soil, but this requires a large rotational force and also requires rotation in the same area. Therefore, it has drawbacks such as being less effective.

In order to eliminate such drawbacks, this invention increases the diameter of the screw auger blades in the excavated earth and sand intake chamber, and also slides the casing equipped with the auger back and forth using a jack. When the earth and sand adhere to and accumulate on the inner wall of the earth and sand intake chamber, the auger blades are brought closer to the inner wall of the earth and sand intake chamber by retracting the screw auger, and the blades of the auger are rotated in that state. This device is designed to scrape off and discharge accumulated dirt and sand, and to explain its configuration with reference to the embodiment shown in the drawings, 1 is a shield excavator body, and a cutter 2 is attached to the rear side of the shield excavator body. A cutter drum has a funnel-shaped peripheral wall 3 surrounding it to form an earth and sand intake chamber 4, and a receiving part 5 is provided at the center of the rear surface of the cutter 2 to slidably support a rotating shaft of a screw auger to be described later. 6 with a seal 7 on its circumferential side.
A gear 8 is attached to the outer periphery of the rear end of the cutter drum 6, and the shield excavator main body 1 is attached to the cutter drum 6.
A small gear 11 fixed to a rotating shaft 10 of a motor 9 installed inside the motor meshes with the rotating shaft 10 to rotate.

Next, reference numeral 12 is a screw auger casing, which is supported on a support base 13 so that it can slide back and forth.The front and back of the casing are opened to serve as an inlet for earth and sand, and the rear end has an earth and sand outlet 14. The outside of the front end is closely supported by the rear end of the cutter drum 6 via a bearing 15.

A screw auger 16 is installed at the center of the casing 12, and the tip of its rotating shaft is fitted into the receiving portion 5 of the cutter 2 so as to be able to slide back and forth. Let it protrude and attach belt pulley 1 to this.
7 and fix this f.

- motor 18 provided on the outside of the casing 12
The screw auger 16 is rotated by passing a belt 20 over the pulley 19 of the rotating shaft.

In order to slide the casing 12 back and forth, a part of the cylinder of the jack 21 is attached to the support base 13, the tip of the piston rod 22 is connected to the casing 12, and the casing 12 is moved by applying hydraulic pressure or the like to this cylinder. It is operated back and forth.

Incidentally, by increasing the diameter of the blade 16' at the tip of the screw auger 16, it is possible to efficiently crush the earth and sand that adheres and accumulates on the funnel-shaped peripheral wall.

In this earth and sand discharge device configured as described above, when the screw auger 16 is used under normal conditions, the screw auger 16 is the first
If the cutter 2 is operated in the front position as shown in the figure, the dirt taken into the rear chamber by the rotation of the cutter 2 will be sent rearward by the screw auger 16 and discharged from the discharge port 14 at the rear of the casing 12. and transported outside by a belt conveyor or transport vehicle.

During excavation work in this way, if earth and sand start to accumulate in an arch shape on the inner wall of the earth and sand intake chamber, operate the jack 21 to move the casing 12 back together with the screw auger 16. By doing so, the blades 16' of the screw auger rotate while coming into contact with the funnel-shaped inner circumferential wall, that is, the adhered soil 23, and break it down so that it can be easily discharged.

In addition, if the earth and sand discharge efficiency begins to decrease due to dirt moving to the tip of the screw auger 16 when it is retracted, operate the jack to move the screw auger forward and break up the adhering dirt while moving the tip of the screw auger. This is to allow soil to be taken in from the area.

In addition to the above-described embodiment in which the screw auger is configured to slide back and forth together with its casing, the present invention can also be implemented by mounting only the screw auger on the casing so that it slides. be.

As described above, this sediment discharge device prevents sediment from accumulating on the inner wall of the sediment intake chamber by sliding the screw auger between the front position in a normal state and the rear position in an abnormal situation. This has practical effects such as being able to smoothly discharge excavated soil at all times.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view, and FIG. 2 is a partially cutaway side view of the screw auger in a retracted state. 1... Shield excavator main body, 2... Cutter 3... Peripheral wall, 4... Sediment intake chamber, 5... Rotating bearing Part, 6... Cutter drum, 7... Seal, 8... Gear,
9... Motor, 10... Rotating shaft, 1
1... Small gear, 12... Casing,
13...Support stand, 14...Discharge port, 1
5... Bearing, 16... Screw auger 16'... Screw auger blade, 17... Belt pulley, 18...
・Motor, 19...Pulley, 20...
...belt, 21...jacket, 22...
...Piston rod, 23... Earth and sand.

Claims (1)

[Scope of utility model registration request] The diameter of the feed blade 16' of the screw auger 16 for carrying out earth and sand in a shield excavator is made larger on the face side, and this is supported so as to be slidable back and forth, so that it can be moved close to or from the inner wall of the earth and sand intake chamber 4. An earth and sand transport device for a shield excavator configured so that it can be separated.