KR0158084B1 - Screw conveyor for the shield machine - Google Patents

Abstract

The present invention provides a screw wheel conveyor apparatus for a soil dispersing device having improved wear resistance of a screw blade.

The earth and sand excavated by the cutter head 2 provided at the front part of the seal body 1 is accommodated in the chamber 1a at the front part of the shield body 1, and then the chamber 1a is screwed by the screw conveyor 4. In the earth pressure seal excavator which is to be carried out in the above), a plurality of cemented carbide tips 8 are formed at a predetermined pitch P in the circumferential direction on the outer circumferential surface of the screw right wing 4b of the screw right conveyor 4 described above. The wear resistance of the screw wing 4b is improved by the cemented carbide tip 8, so that it is possible to carry the stable soil for a long time.

Description

Screw UW Conveyor Equipment for Topdressing of Earth Pressure Sealed Excavator

1 is a cross-sectional view of a conventional earth pressure seal excavator.

FIG. 2 (a) is an explanatory diagram showing a screw right wing of a topless screw wheel conveyor provided in a conventional earth pressure seal excavator.

FIG. 2B is a cross-sectional view taken along the line E-E in FIG. 2A.

3 is a cross-sectional view of a earth pressure seal excavator which is an embodiment of the present invention.

4 is a cross-sectional view of the top cover screw conveyor device provided in the earth pressure seal excavator which is one embodiment of the present invention.

FIG. 5 is an enlarged view of circle A in FIG. 4.

6 is a perspective view from the B direction in FIG. 5.

7 is a cross-sectional view taken along the line C-C in FIG.

8 is an explanatory view showing the action of the top cover screw conveyor device for one embodiment of the present invention.

9 is a cross-sectional view of a top cover screw conveyor device according to another embodiment of the present invention.

FIG. 10 is a cross-sectional view taken along the line D-D in FIG.

FIG. 11 is an explanatory diagram showing another embodiment of a projection protruding from the casing inner surface.

12 is an explanatory diagram showing another embodiment of a protrusion protruding from the casing inner surface.

FIG. 13 is an explanatory diagram showing another embodiment of a protrusion protruding from the casing inner surface.

* Explanation of symbols for main parts of the drawings

1: Sealed Body 1a: Chamber

2: cutter head 4: screw right conveyor

4a: casing 4b: screw right wing

4g: stone 8: carbide tip

p: pitch

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a top cover type screw conveyor system for earthwork type seal excavators with improved wear resistance of screw blades.

In the conventional earth pressure seal excavator, as shown in FIG. 1, a cutter head (c) rotated and driven by a cutter head motor (b) is provided at the front of the seal body (a). and c) to excavate the mining site (d) in front of the shield body (a).

In addition, the earth and sand excavated by the cutter head (c) is accommodated into the chamber (e) in front of the shield body (a), and then carried out in the chamber (e) by the screw u-conveyor (f). It is to be carried out by the earth and sand conveying device to the back.

On the other hand, the above-mentioned conventional screw right conveyor f is provided with the screw right wing h in the casing g, and this screw right wing h is rotated by the screw right gear 1, The earth and sand in the chamber e is accommodated in the casing g, and the earth and sand are conveyed to the rear of the casing g by using friction between the inner surface of the casing g and the soil.

For example, Japanese Patent Application Laid-Open No. 60-100497 proposes a tunnel excavator that efficiently transports gravel in the soil by providing projections on the conveying side or the opposite side of the screw blades in the screw conveyor. .

Moreover, in Unexamined-Japanese-Patent No. 60-85395, a protrusion is formed in the wedge-shaped part formed between the tip of the receiving end of the earth and sand in a screw-woofer conveyor, and the screw-to-wing, and the outer diameter side used as the soil-ejection side of a screw blade. A tunnel excavator has been proposed to efficiently transport gravel in soils by installing

However, in the conventional screw wheel conveyor (f), due to the structure in which the screw blade (h) is added to the wear surface material (j) as shown in (a) and (b) of FIG. When the gravel or the like is conveyed, there is an inconvenience in that the screw blade h is worn early and the carrying capacity is lowered.

In addition, the gap between the inner surface of the casing g and the outer periphery of the screw blade h is increased due to the wear of the screw blade, so that gravel and the like are easily picked up. As a result, excessive torque is applied to the screw blade u. There also existed inconvenience, such as the durability of the screw-mounted motor i falling prematurely.

In the case of the cutter bit for the seal excavator, as described in Japanese Patent Laid-Open No. 4-166596, a plurality of cemented carbide tips are stably cut in a multistage manner from the leading end side to the front end side of the alloy in at least the cutting direction from the leading end side. As shown in Japanese Patent Application Laid-Open No. 3-87494, a carbide tip having the same inclined surface as the wedge slope is installed at the tip of the edge portion, and a hardened material is formed in the recess formed on the wedge slope of the alloy. Although it is widely known to improve the wear resistance of the edge part by filling it up, it is a phenomenon that special measures are not conventionally taken regarding the countermeasure against premature wear of a screw blade in a screw right conveyor apparatus.

The present invention has been made to improve such inconvenience, and an object of the present invention is to provide a screw right conveyor device of a earth pressure type seal excavator that has improved wear resistance of a screw blade.

The present invention, in order to achieve the above object, by receiving the soil excavated by the cutter head installed in the front portion of the shield body into the chamber of the front portion of the shield body, the earth pressure type to be carried out in the chamber by a screw u conveyor In a sealed excavator, a plurality of cemented carbide tips are attached to the outer circumferential surface of the screw right conveyor blade at a predetermined pitch in the circumferential direction.

In addition, the pitch of the cemented carbide tip is reduced as much as the rear side of the casing, which is liable to wear out the screw blade. Moreover, a plurality of protrusions are provided on the inner circumferential surface of the casing.

The above construction improves the wear resistance of the screw blade and also reduces the incidence of small gravel and the like between the outer circumferential surface of the worn screw blade and the casing inner surface. You can prevent it.

By reducing the pitch of the cemented carbide tip as much as the rear side of the casing, which is liable to wear out, the life of the screw blade is improved, and protrusions are provided on the inner surface of the casing. As a result, the coefficient of friction of the inner surface of the casing becomes larger than the wear coefficient of the surface of the screw right wing, so that the soil is not attached to the blade, does not rotate with the blade, and is closed to the rear, so that the conveyance efficiency is improved.

EXAMPLE

An embodiment of the present invention will be described in detail with reference to the drawings shown below in FIG.

FIG. 3 is a sectional view of the earth pressure seal excavator, FIG. 4 is a sectional view of a screw soil conveyor apparatus for waste soil, FIG. 5 is an enlarged view in circle A of FIG. 4, FIG. 6 is a perspective view from B direction of FIG. 5, FIG. FIG. 6 is a cross-sectional view taken along line CC of FIG. 6.

In FIG. 3, 1 is a seal body, and the cutter head 2 rotated by the cutter head motor 3 is provided in the front part.

The earth and sand excavated by the cutter head 2 is received into the chamber 1a in front of the shield body 1 and then carried out in the chamber 1a by the screw comb conveyor 4, which is not shown. It is to be conveyed backward by the earth and sand conveying device.

The screw right conveyor 4 is composed of a casing 4a which is inclined to face down and a screw right wing 4b having a coil shape accommodated in the casing 4a. The front end of the screw right wing 4b protrudes into the chamber 1a, and the rear end is firmly attached to the inner surface of the rotating cylinder 4c which is freely rotatable to the rear end side of the casing 4a.

A ring gear 4d is firmly attached to the outer circumferential surface of the rotating cylinder 4c, and the screw gear motor 5 attached to the casing 4a via the gearbox 4e is attached to the ring gear 4d. The pinion 5a is engaged, and the screw right wing 4b is rotated by rotating the rotating cylinder 4c by the screw right gear 5.

In addition, at the rear end of the casing 4a, a waste toe gate 7 which is opened and closed by the gate cylinder 6 is provided, and the soil to be conveyed by the screw right wing 4b is opened by opening the waste toe 7. It is possible to discharge in (4a).

On the other hand, a plurality of cemented carbide tips 8 are firmly attached to the outer circumferential surface of the screw right wing 4b at a predetermined pitch P along the circumferential direction by an apparatus such as welding.

The above-described cemented carbide tip 8 is formed in a plate body having a rectangular shape shorter in length than the width W of the outer circumferential surface of the screw right wing 4b, and as shown in FIG. One end is firmly attached to the rear edge, and the pitch P of the cemented carbide tip 8 is set to be smaller as much as the rear side of the casing 4a where the pressure density of the soil is increased.

That is, as shown in FIG. 4, in the range of L ₁ slightly ahead of the middle of the casing 4a, the pitch of the cemented carbide tip 8 is, for example, 2P, and in the range of approximately middle L ₂ , for example, 1.5P. And 1P in the range of L ₃ behind the middle portion, and is configured such that the wear resistance of the screw right wing 4b is increased as much as the rear side of the casing 4a.

Next, when the operation | movement is demonstrated, the earth and sand excaved by the cutter head 2 and accommodated in the chamber 1a are accommodated in the casing 4a at the front end of the screw-wing 4b, and then back inside the casing 4a. It is conveyed, discharged | emitted from the discharge gate 7 to the earth and sand conveying apparatuses 10, such as a belt conveyor, and conveyed back by the earth and sand conveying apparatus 10. FIG.

In addition, when conveying the soil in the casing 4a by the screw blade 4b, the outer circumferential surface of the screw blade 4b sticks to the soil stuck to the inner surface of the casing 4a, but the screw blade 4b The carbide tip 8 is firmly attached to the outer circumferential surface at the predetermined pitch P, so that the carbide tip 8 is not worn out prematurely and between the carbide tips 8 on the outer circumferential surface of the screw right wing 4b. As shown in FIG. 8, a thin film 9 is formed by the deep soil, and the thin film 9 prevents the wear of the outer periphery of the screw blade 4b, and thus the wear resistance of the screw blade 4b is prevented. The carbide tips 80 interact with each other to further improve.

In the above embodiment, the carbide tip 8 is attached to the outer circumferential surface of the screw right wing 4b at a predetermined pitch P, but at the same time, the projection 4g is provided on the inner surface of the casing 4b, The conveyance efficiency can also be improved.

9 to 13, the inner circumferential surface of the casing 4a is spaced in the circumferential direction along the axial direction of the casing 4a, as shown in FIGS. 9 and 10. A plurality of protrusions 4g protrude.

These protrusions 4g have a semicircular cross section, for example, and a slight gap is formed so that the top portion does not interfere with the cemented carbide tip 8 fixed to the outer circumferential surface of the screw right wing 4b.

The projection 4g may be provided in a mesh shape as shown in FIG. 11, or may be provided in a spiral shape as shown in FIG. 13 or a combination of axial and circumferential directions as shown in FIG. Next, when the operation | movement is demonstrated, the earth and sand excaved by the cutter head 2 and accommodated in the chamber 1a are accommodated in the casing 4a by the screw thread 4b, and convey the inside of the casing 4a to the back, A plurality of protrusions 4g protrude from the inner surface of the casing 4a in the axial direction, and as shown in FIG. 10 between the protrusions 4g due to the rotation of the screw 4b, as shown in FIG. Thin film) 12 is formed.

As a result, the earth and sand contained in the casing 4a has a higher frictional force than that of the soil attached to the screw blades when the soil 12 comes into contact with the film 12 of the soil sand. Thus, the soil adhesion force of the screw 4b is reduced and the seed ( Since the wastes are eliminated, the return of the soil is carried out efficiently.

Incidentally, in a casing having a smooth inner surface, the friction coefficient (μ1) of the screw right surface and the friction coefficient (μ2) of the inner surface of the casing are approximately equal (μ1 = μ2). The earth and sand were not able to rotate and convey together with the screw, but the friction coefficient (mu1) and the casing 4a of the surface of the screw 4b were formed by forming the film 12 of the soil to the inner surface of the casing 4a as in the present invention. Since the relationship between the friction coefficient mu 2 of the inner surface is always maintained at mu 1 < mu 2, the earth and sand in the casing 4a does not rotate with the screw 4b and can be efficiently conveyed.

As described above, the present invention attaches a number of cemented carbide tips to the outer circumferential surface of the screw right wing of the screw right conveyor at a predetermined pitch in the circumferential direction, so that wear of the outer circumferential surface of the screw right wing can be greatly reduced.

As a result, the gap between the inner surface of the casing increases due to abrasion of the outer surface of the screw blades, and it is difficult for small gravel or the like to enter the gap, so that excessive torque does not act on the screw motor and the screw motor Can significantly improve durability.

In addition, a thin film of earth and sand is formed on the outer circumferential surface of the screw blade by the earth and sand deeply inserted between the cemented carbide tips, and the thin film prevents the wear of the screw blade, thereby improving the life of the screw blade and Wear resistance is further improved by reducing the pitch of the cemented carbide tip as much as the rear side of the casing, which is densified by pressure.

Moreover, since the carbide tips can be attached to the outer circumferential surface of the screw blade at predetermined intervals, it is easier and more economical than the case of attaching the wear-resistant material to the entire outer circumferential surface of the screw blade. Even in this worn condition, it is easy to repair because the carbide tip needs to be replaced.

In addition, if a projection is provided on the inner surface of the casing to form a film of earth and sand on the inner surface of the casing, the coefficient of friction of the inner surface of the casing is always higher than the friction coefficient of the soil attached to the screw blade by the film of soil. Since the earth and sand do not rotate together with the screw right wing, the conveyance efficiency of the earth and sand can be improved.

Claims (3)

The earth and sand excavated by the cutter head 2 provided in the front part of the seal body 1 is accommodated in the chamber 1a in front of the shield body 1, and then the chamber 1a is screwed by the screw conveyor 4. In the earth-sealed seal excavator to be carried out in the), a plurality of cemented carbide tips (8) at a predetermined pitch (P) in the circumferential direction, on the outer circumferential surface of the screw right wing (4b) of the screw right conveyor (4) Tossed screw conveyor system of the earth-sealed seal excavator, characterized in that configured to attach. 2. The method of claim 1, wherein the pitch P of the cemented carbide tip 8 is made smaller by the rear side of the casing 4a. The top cover screw conveyor device according to claim 1, wherein a plurality of protrusions (4g) are provided on the inner circumferential surface of the casing (4a).