Cutting tool for mining machines

FIELD: mining.

SUBSTANCE: cutting tool for mining machines includes holder with axial conical channel where there fixed is a shank of cutting tip formed by some close-ended symmetrically arranged fixing elements with conical operating part. Hard-alloy elements are done in a form of central stem of conical shape and blades. The blades have trapezoidal form in vertical plane, the larger base of which is oriented towards the holder, and are installed between fixing elements surfaces facing each other flush with their outer surface, note that there is an annular bore in the lower end of the holder and blades' upper ends have projections arranged in annular bore of the holder.

EFFECT: reduction of hard-alloy consumption and increase of cutting tool efficiency by excluding the possibility of worn cutting tools fragments getting under the other cutting tools.

2 cl, 3 dwg

 

The invention relates to the mining industry, namely the rock cutting tool the tool used to equip the Executive bodies of excavation and tunneling machines.

Known cutter for mining machines, containing a cylindrical shank with an axial conical bore for the shank of the cutting tip, equipped with carbide element (see U.S. patent No. 342532, CL 299-92, 1967).

The disadvantages of the known cutter should be attributed to the relatively low resistance and a large amount of solid alloy.

Closest to the proposed to the technical essence and the achieved result is a cutter for mining machines comprising a shank with a tapered axial channel, which establishes the response form the shank of the cutting tip containing carbide elements and latches with conical working part (see ed. St. USSR №1420153, CL IS 25/38, 1988).

The disadvantage of this cutter is a significant consumption of expensive carbide material, because after wear of the spherical carbide of the elements on the quantity of its radius under the action of dynamic loads they fall from spherical nests. Another disadvantage of the cutter is the probability of getting drawn residues carbide elements under other carbide elements and their withdrawal from the system, which significantly reduces the AET as speed, and the sinking of the Executive bodies of mining machines.

In connection with the stated technical result of the invention is to reduce the amount of solid alloy and increase the efficiency of the cutter by increasing the penetration and speed of destruction of rocks by reducing the probability of residues cutters under new cutters and reduction of the amount of precipitated residue waste incisors.

This technical result is achieved by the fact that the cutter for mining machines comprising a shank with a tapered axial channel, which establishes the response form the shank of the cutting tip containing carbide elements and latches with conical working part, according to the invention carbide elements made in the form of a Central rod and blades having vertical plane trapezoidal shape, a larger base of which is oriented in the direction of the toolholder, and installed between the converted one to the other surfaces of the tabs flush with their outer surface, with the bottom end of the holder is made circular bore, and the upper ends of the blades are made with tabs in the circular bore of the tool holder.

To achieve the specified technical result is also the fact that the Central rod is made with a conical outer surface.

From Britanie illustrated in the drawing, which figure 1 shows a General view of the cutter in a longitudinal section; figure 2 is a section a-a in figure 1; figure 3 - a view B figure 1.

The cutter consists of a shank 1, a tapered axial channel 2 which is mounted a cutting tip with a tapered shank. The cutting tip is made of several symmetrical latches with 3 conical working part 4 and the carbide elements made in the form of a Central rod 5 and 6 blades having vertical plane trapezoidal shape (see figure 3), a larger base of which is oriented in the direction of the tool holder 1. The blade 6 is installed between the converted one to the other surfaces of the clamps 3 are flush with their outer surface. The upper ends of the blades 6 provided with lugs 7, placed in the annular bore 8, is made on the bottom of the tool holder 1. Such a connection of the blades 6 with holder 1 forms a locking connection, which protects the blade 6 radial displacement. Central carbide rod 5 and the inner surface of the working part 4 clamps 3, between which is placed the Central rod 5, is made with the response conical surfaces.

The principle of operation of the cutter is as follows. When rotation is applied and the drum of the Executive body along the face of the cutter successively destroys the array of coal or rock. In the process of developing the relationships of rock cutting tip wear retainers 3 is much faster than the wear of the Central rod 5 and 6 blades. The result is the gradual exposure of the carbide elements, which are destroying the breed. The main function of the Central rod 5 is the destruction of the breed, and the main purpose of the blades 6 - protection of the conical working part 4 clamps 3 from increased wear, especially when working in abrasive rocks. In the process, the Central rod 5 and the blade 6 is held from falling out due to their tapered shape and clamp the tapered shank of the cutting tip in the axial channel 2 of the tool holder. The blade 6 radial offset held by the projections 7 that its outer surface in contact with the wall of the circular bore 8 of the holder 1.

The design of the cutter can significantly reduce the amount of solid alloy and to improve the efficiency of the cutting tool by eliminating the probability of fragments of worn incisors under other cutters.

1. Cutter for mining machines comprising a shank with a tapered axial channel, which establishes the response form the shank of the cutting tip containing carbide elements and latches with conical working part, characterized in that the carbide elements made in the form of a Central rod and blades having vertical plane trapezoidal shape, pain is its base which is oriented in the direction of the tool holder, and installed between the converted one to the other surfaces of the tabs flush with their outer surface, with the bottom end of the holder is made circular bore, and the upper ends of the blades are made with tabs placed in the annular bore of the tool holder.

2. Cutter for mining machines according to claim 1, characterized in that the Central rod is made with a conical outer surface.



 

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The invention relates to the mining and construction industries, t

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