Wear Resistant Cutting Pick. The invention relates to cutting picks for wall breaking, tunnelling, trenching, coal mining and road milling machines, surface miners and more particularly to wear resistant cutting picks. Picks for breaking or excavating machines are generally comprised of an alloy steel pick body and a 5 carbide alloy pick tip. The carbide alloy pick tip is welded to the head of the pick body using soldering technology. During cutting or breaking operation, the head of the cutter is strongly squeezed and subject to friction. Thus the pick body around the carbide alloy pick tip will wear out, generally resulting in the falling off of and catastrophic damage to the pick tip. Therefore it is one objective of the present invention to provide a wear resistant pick for breaking or .0 excavating machines capable of increasing the wear resistance and strength of the pick body so as to extend the useful life of the pick. To achieve the above objective, there is provided a wear resistant pick, comprising of a carbide alloy pick tip and a pick body, wherein a multiple of wear resistant members are installed on the pick body around the carbide alloy pick tip. .5 In certain embodiments of the present invention, the carbide alloy pick tip is in the shape of a cylinder with a tapered tip, a multihedral prism, a mushroom, a bi-conical polyhedron a bell or the like. In certain embodiments of the present invention, the wear resistant member is in the shape of a cylinder, a frustum, a truncated cone, a rectangular parallelepiped, multihedral prism, a cone, or the 0 like and its size is chosen according to the shape and size of the carbide alloy pick tip. In certain embodiments of the present invention the wear resistant member is a sheet body. In certain embodiments of the present invention the number of the wear resistant members installed on the pick body around the pick tip is in the range of 3 to 50 and optimally in the range of 6 to 20. 25 In certain embodiments of the present invention the pick body around the carbide alloy pick tip comprises of 2-50 pieces of wear resistant members. As a result, in accordance with the present invention, the strength, hardness and wear resistance of the pick body are improved largely alleviating conventional problems of wear and fatigue and reinforcing the attachment of the pick tip. The early failure of the pick tip die to the premature wear 30 of the pick body is overcome and the lifetime of the pick is increased 2 to 3 fold with respect to that of a conventional pick.
Description of the drawings: The invention may be better understood with reference to the illustrations of embodiments of the invention which: FIG 1 is a structural view of a pick body installed with cylindrical wear resistant members according 5 to one embodiment of the present invention. FIG 2 is a structural view of a pick body installed with rectangular wear resistant members according to one embodiment of the present invention. FIG 3 is a structural view of a pick body installed with sheet shaped wear resistant members according to one embodiment of the present invention. .0 FIG 4 is a structural view of a pick body installed with cylindrical and sheet shaped wear resistant members according to one embodiment of the present invention. FIG 5 is a structural view of a mushroom shaped pick tip according to one embodiment of the present invention. FIG 6 is a structural view of a bi-conical polyhedron shaped pick tip according to one embodiment of .5 the present invention. FIG 7 is a structural view of a bell shaped pick tip according to one embodiment of the present invention. The reference numbers of the various parts shown in the drawing are listed below in which the carbide alloy pick tip corresponds to the numbers 1, the pick body corresponds to numbers 2, and .0 the wear resistant members corresponds to the numbers 3.
Detailed Description Of The Embodiments: The present invention will hereinafter be described further according to the embodiments. As shown in the Figures, a wear resistant bit comprises a carbide alloy bit tip 1 and a bit body 2. A plurality of wear resistant member 3 is installed on the bit body 2 around the carbide alloy bit tip 1. 5 The wear resistant member 3 can be in the shape of a cylinder, a truncated cone, a frustum, a rectangular parallelepiped, multihedral prism, a sheet body a cone, or the like. FIGS 1-7 illustrate a bit model TU102/35 in accordance with the present invention. As shown in FIG 1, 6 pieces carbide alloy cylinders acting as wear resistance member are installed uniformly around the carbide alloy bit tip 1. The cylinders have a diameter of 3.5mm and a height of 15mm. .0 FIG 2 illustrates a rectangular wear resistance member 3 installed on the bit body 2. FIG 3 illustrates a sheet shaped wear resistance member 3 installed on the bit body 2 FIG 4 illustrates both cylindrical and sheet like wear resistant member 3 installed on the bit body 2. The sheet body can be in the shape of an arc or plate. The wear resistance member 3 is installed on the bit boy 2 by welding screwing riveting or the like .5 FIG 5 illustrates a mushroom shaped bit tip of the present invention. The wear resistance member 3 intersects with an extended conical surface of the maximum axial outline of the bit tip 1. FIG 5 illustrates a bi conical polyhedron shaped bit tip 1 of the present invention. FIG 7 illustrates a bell shaped bit tip 1. The wear resistance member 3 intersects with an extended conical surface of the maximum axial outline of the bit tip 1. O With respect to the bit tips illustrated in FIG 5 and FIG 7, the size of the front face of the bit is decreased, so that the operational resistance of the bit is reduced, the vibration and dust emission are lowered, and meanwhile, the exposure of the wear resistance member 3 to the material to be broken up or excavated is reduced. Thus, the wear resistant member 3 is protected effectively. Similarly, if the front protruded conical surface of the bi conical polyhedron shaped bit tip 1 25 illustrated in FIG 6 is extended, the functions as illustrated in FIG 5 and FIG 7 are realized. Although the present invention has been described in connection with preferred embodiments thereof, it will be appreciated by those skilled in the art that additions, modifications, substitutions and deletions not specifically described may be made with departing from sprit and scope of the invention as defined in the claims.