JPS6011198Y2 - Large solid material crushing device for shield excavator - Google Patents

Description

[Detailed description of the invention] The present invention relates to a coarse solid material crushing device for a shield excavator, and its purpose is to expand the range of soil conditions to which the shield excavator can be compatible, and to ensure work safety. It is in.

When excavating with a shield excavator, excavated earth and sand are taken into the machine and transported to a rear earth removal section by an earth removal device.

A screw conveyor is used as the earth removal device when continuous earth removal is performed or when earth pressure or mud water pressure is maintained in a portion facing the face to prevent collapse of the earth face.

For example, as shown in FIG. 1, a face pressure type shield excavator is provided with a screw conveyor 3 between an excavated soil intake section 1 and an earth discharge section 2 located behind it. This request is met by forming a moving layer of excavated soil that can maintain pressure in the cylindrical trough 4 of the present invention.

In this case, earth pressure or mud water pressure is maintained in the intake portion 1, and collapse of the face is prevented.

However, in the conventional device as shown in the figure, the excavated soil receiving inlet of the screw conveyor 3 is simply connected to the trough 4.
Since the opening 5 is simply formed in the excavated earth and sand, there is a problem when coarse solid matter S such as gravel, cobblestones, and boulders is present in the excavated earth and sand.

That is, in the above case, since it is difficult for the coarse solids S to move within the trough 4, they gather at the earth and sand receiving opening, thereby reducing the amount of earth and sand received in the subsequent excavation.

Moreover, the screw conveyor becomes unable to rotate, and forcing it to rotate may lead to damage or destruction.

Furthermore, if the soil continues to not be discharged, groundwater will flow through the trough 4 and flow out from the gate 6, causing the face to collapse, making the work dangerous.

Due to these circumstances, conventional devices could only be used in soil conditions where there were no cobbles, gravel, or boulders.

The present invention has been devised in view of the above, and examples thereof will be described below.

2 to 4, 10 is a shield, 11 is a cutter head, and 12 is a cutter head drive motor, and the cutter head 11 is concentrically supported by the shield 10 via a support 13.

Reference numeral 14 denotes a partition wall fixed on the seal vinyl 10 side, and the part between this partition wall 14 and the cutter head 11 facing the face is used as the excavated soil intake part 15, and the rear part of the partition wall 14 is It is referred to as an earth removal section 16.

In the face pressure type shield excavator, earth pressure or mud water pressure is maintained in the earth and sand intake section 15, thereby preventing the face from collapsing.

Reference numeral 17 denotes a screw conveyor for earth removal, which is provided between the earth and sand intake section 15 and the earth discharge section 16.

The trough 18 of the screw conveyor 17 is the earth and sand intake part 15
It has an enclosure 19 that opens upward inside the enclosure 1.
A crushing device 20 for coarse solids S is provided in the container 9 .

Note that 21 is a dirt receiving port formed in the trough 18.

The crushing device 20 is provided inside the enclosure 19.

3 and 4, the crushing device 20 includes a pair of upper jaws 22A, 22B and a lower jaw 23A, which face each other at the upper and lower parts of the enclosure 19.
, 23B, and each jaw 22A, 22B, 23A, 23B.
Two hydraulic cylinder devices 22at are provided for each
22bt 23aw 23b.

That is, each jaw 22A, 22B, 23A, 23B is connected to a respective hydraulic cylinder device 2Lr, 22b, 23a, 2
3b is configured to enter and exit.

Now, if the diameter of gravel that can be transferred by the screw conveyor 17 is d, then the pair of lower jaws 23A, 23 facing each other
When B is at the retraction limit, the gap a is set so that d≧a, and when the upper jaws 22A, 22B are at the retraction limit, the gap a is set so that b≧a. It is assumed that

Note that the upper jaw 22A. 22B1 lower jaw 23A, 2
It is desirable to implant spikes or carbide tips into the end face of 3B in order to improve its crushing ability.

According to such a configuration, the earth and sand intake section 15 is removed by excavation.
Even if coarse solids S such as gravel, boulders, boulders, and clay lumps are mixed in the soil taken into the soil, they are crushed into fine-grained soil and then conveyed to the earth removal section 1 by the screw conveyor 17.
6 and can be discharged.

That is, upper jaws 22A, 22B1 lower jaw 23
The screw conveyor 17 is operated with A and 23B set as retraction limits, and the upper jaws 22A and 22B are simultaneously protruded at an arbitrary timing or at regular intervals. It is determined whether or not the intake port 21 is clogged.

If it is found that it is clogged, the hydraulic cylinder device 22a
.

Upper jaws 22A and 22B are further projected by 22b, and the coarse solids are squeezed and crushed between them.

Furthermore, if a large amount of coarse solids S with d=a clog the earth and sand receiving port 21, this can be determined by an increase in the torque of the screw conveyor 17 or a decrease in the amount of soil discharged.

Therefore, in that case, the lower jaws 23A and 23B are made to protrude from both sides to compress and crush the coarse solids S.

The coarse solids crushed as described above are transferred as fine-grained earth and sand by the screw conveyor 17 and discharged to the earth removal section 16.

FIG. 6 shows a modification.

This is the upper jaw 22A explained in FIGS. 3 and 4,
22B1 lower jaws 23A, 23B are each divided into two parts, and each of them is connected to each hydraulic cylinder device 24a, 24b, 25a.
, 25b (not shown) so that each can be moved in and out independently.

Note that 24A, 24B, 25A, and 25B indicate the divided upper jaw and lower jaw, respectively.

FIG. 7 shows an example of a hydraulic circuit for operating the crushing device 20.

That is, A1 is a hydraulic cylinder device for moving the upper jaw or the lower jaw in and out.

In FIG. 7, when the A port of the four-way valve 1 is opened, the pump discharge oil O passes through the pilot check valve V2 and enters the hydraulic cylinder device Att A2, pushing out the piston rod.

When the coarse solids S are clogged, the pump discharge oil pressure increases, so the sequence valve V3 is opened, the pressure intensifier P is activated, and the increased oil pressure is used to control the hydraulic cylinder device Al? AI
The piston rod will be further pushed out.

Therefore, the coarse solids S are crushed.

In the piston rod retraction process, the four-way valve v1 is switched to the C port, and the pilot check valve v2 is opened.

Also, by setting the four-way valve v1 to the B port, the hydraulic cylinder device A1. The piston rod of A2 stops at that position.

The above intervals a and b are set by this operation.

As described above, according to the present invention, the gravel that has entered between the two upper jaws is clamped by the upper jaws in a fixed state,
Shattered.

In order to effectively crush the gravel, it is necessary to fix the gravel and apply pressure toward the center of the gravel, but the present invention satisfies these conditions. can be crushed efficiently.

Furthermore, even if the gravel is larger than the gap between the upper jaws, if some of the gravel falls between the upper jaws, the gravel will be crushed little by little until it is completely crushed. .

Also, by making both lower jaws work together with both upper jaws, gravel can be quickly crushed.

Furthermore, since the distance between both lower jaws is set to be equal to or smaller than the gravel diameter that can be transferred by the screw conveyor, there is no risk that the screw conveyor will become clogged with gravel and become inoperable.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of a conventional device, Figs. 2 to 7 show an embodiment of the present invention, Fig. 2 is a longitudinal side view, and Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 2. Figure 4 is a cross-sectional view taken along line B-B in Figure 3, Figure 5 is an enlarged cross-sectional view of main parts, Figure 6 is a cross-sectional view taken along line A-A in Figure 2 in a modified example, and Figure 7 is a cross-sectional view taken along line A-A in Figure 3. It is a hydraulic circuit diagram. 10... Shield, 14... Partition wall,
15... Earth and sand intake section, 16... Earth removal section, 17... Screw conveyor, 18...
...Trough, 19...Enclosure, 20...
Crushing device, 21... Sediment receiving port, 22A. 22B, 24A, 24B... Upper jaw, 23
A, 23B, 25A, 25B...lower jaw,
22at 22bt 23at 23bt 2
4av 24bg 25 a, 25 by Att
A2"""hydraulic cylinder device, S...... coarse solid matter.

Claims (1)

[Scope of utility model registration request] A group of upper surface openings is provided in the upper part of the earth and sand receiving port in the said intake part of the trough in the earth and sand removal screw conveyor provided between the excavated earth and sand intake part and the earth discharge part behind it,
A pair of upper jaws and a pair of lower jaws are movably disposed on both sides of the enclosure, sandwiching the earth and sand receiving opening, and a hydraulic cylinder device is provided to independently move each jaw in and out. Set the distance between both lower jaws at the end to be the same as or smaller than the gravel diameter that can be transferred by the screw conveyor, and set the distance between both upper jaws at the retraction limit to be equal to or larger than the distance between both lower jaws. A coarse solid material crushing device for a shield excavator, which is characterized by: