Cutter for mining machines

FIELD: mining.

SUBSTANCE: cutter for mining machines includes a holder with an axial channel. A cutter shank is fixed in axial channel with possibility of being turned and with possibility of restricted axial movement. Also, elastic element in installed in axial channel between end face of axial channel and shank. Peculiar feature of the above proposed cutter is that holder is provided at least with one radial slot in which a guide rod is fixed. Cutter shank is equipped with a bushing rigidly attached to it, the projecting part of which is provided with a wear-resistant material. Opposite (lower) part of the bushing is provided with an inclined slot for interaction with a guide rod of the holder. Besides, wear-resistant material is applied to external surface of the bushing in the form of inclined strips located in a staggered order.

EFFECT: such design of cutter allows increasing its operating efficiency and operating efficiency of an element of a continuous heading or extracting machine as a whole.

2 cl, 2 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 with carbide element (see U.S. patent No. 342532, CL-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 an axial channel, which can be rotated and limited axial movement of the anchor shank of the cutting tip and mounted in the axial channel between the end face of the axial channel and the shank of the elastic element (see avts of the USSR №1602985, CL ES 25/38, 1990).

The negative sides of this cutter should be attributed to the lack of efficiency in the work that is associated with a sharp decline in the probability of turning cut after blunting the sharp edges of the spring. Dulling of the edges of the springs may occur in the initial moment when the digging machine in view of the considerable pressures on them, especially when drilling in hard rocks. Moreover, the increase in solids the spine of the bottom of the axial channel of the tool holder and the end face of the shank of the cutter to reduce wear their sharp edges of the spring will cause slippage of the spring, consequently, and to the impossibility of rotation of the cutter. Another reason for low efficiency of the tool, especially when working in abrasive rocks, is one-sided wear of the upper part of the shank, which often leads to the deposition of wear-resistant inserts and hit her under other wear-resistant inserts adjacent cutters and their failure.

In connection with the stated technical result of the invention is to improve the efficiency of the cutter guaranteed by rotation of the cutter during the entire time of its operation and protection of the shank of the cutter from one-sided wear.

This technical result is achieved by the fact that the cutter for mining machines comprising a shank with an axial channel, which can be rotated and limited axial movement of the anchor shank of the cutting tip and mounted in the axial channel between the end face of the axial channel and the shank of the elastic element according to the invention the holder is made of at least one radial channel in which a fixed guide rod and the shank of the cutting tip is fitted rigidly connected with it by a sleeve, the protruding portion which is equipped with wear-resistant material, and the opposite part is made with a sloped groove on the outer surface for engagement with the guide rod powers the I.

The achievement of the technical result is also that the wear-resistant material deposited on the outer surface of the sleeve in the form of inclined strips, arranged in a checkerboard pattern.

The invention is illustrated in the drawing, in which figure 1 shows a General view of the cutter in a longitudinal section; figure 2 - cross section A-a in figure 1.

The cutter consists of a shank 1, a cylindrical axial channel 2 is installed on the shank 3 of the cutter with carbide work item 5 of wear-resistant material. The shank 3 of the cutter is fixed in the tool holder 1 locking pin 6, providing limited axial movement. In the axial channel 2 of the holder 1 between the shank 3 of the cutter and the bottom of the axial channel has elastic element 7 in the form of compression springs. The holder 1 is made of at least one radial channel 8, which is fixed to the guide rod 9 and the shank 3 of the cutter is fitted rigidly connected to it by a removable sleeve 10. Possible option of the holder and sleeve respectively with multiple guide rods 9 and the return of the inclined grooves 11. When working in the first place, abrasive rocks of the outer surface of the protruding upper part of the sleeve 10 must be equipped with a wear-resistant material in the form of inclined strips 4 arranged in staggered and overlapping the surface of the shank is 3 over the entire circumference. The opposite (lower) part of the sleeve 10 is made with an inclined groove 11 for engagement with the guide rod 9 of the holder 1. Guide rod 9 in conjunction with the sleeve 10 forms a node of forced rotation of the cutter during the entire time of its operation. This host is running, the rotation of the shank 3 improves the stability of the sleeves 10, which may be made of a different material compared to the shank 3. However, they can be used multiple times thanks to their detachable connection with the shank 3, which will reduce the cost of installing desktop authority digging machine cutters. Equipping the outer surface of the sleeve 10 a wear resistant material and inclined chessboard pattern of stripes 4 one-sided wear of the shank 3, even if the destruction of abrasive rocks and thus eliminates loss work item 5.

The principle of operation of the cutter is as follows. In the fracture process of rock cutting carbide work item 5 of the cutting tip 3 under the influence of the reaction destructible rocks shank 4 cutter tip 3 is moved in the axial direction and compresses the elastic element 7. Simultaneously, the guide rod 9 communicates with the inclined walls of the groove 11 and force the shank 4 cutter tip 3 to turn the wok is a threat to its longitudinal axis at some angle. This is achieved by forced rotation of the carbide of the working element 5, and hence his uniform wear, which greatly increases the efficiency of its work. After removing the load on the cutter under the action of the spring 7 returns to its original position.

Application of the proposed cutter allows you to reduce the cost of work done by improving the productivity of the working body tunneling and excavation harvesters

1. Cutter for mining machines comprising a shank with an axial channel, which can be rotated and limited axial movement of the anchor shank of the cutting tip and mounted in the axial channel between the end face of the axial channel and the shank of the elastic element, wherein the holder is made of at least one radial groove in which a fixed guide rod and the shank of the cutting tip is fitted rigidly connected with it by a sleeve, the protruding portion which is equipped with wear-resistant material, and the opposite part is made with an inclined groove for engagement with the guide rod holder.

2. Cutter for mining machines according to claim 1, characterized in that the wear-resistant material deposited on the outer surface of the sleeve in the form of inclined strips, arranged in a checkerboard pattern.



 

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