JPH0567462U - Impeller blade in shot blasting equipment - Google Patents

Abstract

(57) [Summary] [Purpose] The life of impeller blades is significantly extended and the weight is reduced. [Structure] A plurality of holes 4 are provided in a base portion of a ceramic plate 3 arranged on a shot sliding contact surface of an impeller blade 1, and a back plate of the stopper plate and the back surface of the ceramic plate are attached with a stopper plate 5 attached to each of the holes. The plastic 6 is integrally molded. Since the plastic covers the clasp attached to the hole at the base of the ceramic plate and bonds it with the ceramic plate in a large area, the bonding strength with the ceramic plate increases, and due to centrifugal force etc. when the impeller disk rotates. The ceramic plate and plastic can be prevented from peeling off and the impeller blade can be prevented from coming off the impeller disk, and the shot makes sliding contact with the ceramic plate having high wear resistance, so that the life of the impeller blade is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an impeller blade used in a shot blasting device.

[0002]

[Prior Art]

 The shot blasting device is used to remove black skin or the like adhering to the surface of a casting product, and is also called an abletter. The outline is shown in FIG. As shown in FIG. 4, a cleaning material such as shots (hereinafter referred to as shots) is supplied from a supply port 11 to the bases of many rotating impeller blades 1 through shot supply holes 12. A large number of impeller blades 1 are radially fixed to the impeller disk 2 by means of dovetail grooves and the like, and rotate together with the impeller disk 2 at a high speed (about 2000 RPM). When the impeller blade 1 rotates in the direction of the arrow in the drawing, the shot is radially projected by the centrifugal force while being pressed against the one side surface 1a of the impeller blade 1, and hits the work set below the opening 13 of the protective case 10. Conventionally, the impeller blade 1 is made of wear-resistant metal such as cast iron or hard chrome steel. However, the front surface 1a of the impeller blade 1 in the rotating direction is in rapid contact with the shot, so the wear is severe and the surface The shape changes or holes are formed. Therefore, not only the shot projection function deteriorates, but also the impeller blade may be damaged. Therefore, the conventional cast iron impeller blade had to be replaced every 2-3 weeks.

JP-A-51-102290 discloses that in order to improve the wear resistance of an impeller blade, a ceramic plate is attached to one surface of an impeller blade made of hard chrome steel with an adhesive or a packing material. It is described as being detachably arranged by being screwed through.

Further, in Japanese Patent Laid-Open No. 61-56869, one or a plurality of divided ceramic materials are attached to the side surface of an impeller blade, or a part thereof is embedded in a base material and fixed. Have been described.

[0005]

[Problems to be solved by the device]

 In the publications described in both publications, a ceramic plate having excellent abrasion resistance is arranged on the sliding surface of the impeller blade against the shot, so that the abrasion resistance of the impeller blade is improved. When the ceramic plate is molded and fired, it shrinks and warps, which makes it difficult to firmly attach it to the base metal of the impeller blade. That is, when the ceramic plate is attached to the base metal of the impeller blade by dovetail fitting, the ceramic plate with dimensional error must be precisely finished, but this process is difficult and costly. Further, only by sticking with an adhesive, there is a problem in stability of the bonding strength with the base material as an impeller blade rotating at a high speed.

The present invention solves the above-mentioned problems, and even a ceramic plate having a dimensional error can be easily and firmly attached integrally to the impeller blade, and the life of the impeller blade can be significantly improved and the impeller blade can be greatly improved. The purpose is to reduce the weight of the blade and reduce the load on the rotary drive system.

[0007]

[Means for Solving the Problems]

 According to the present invention, a plurality of holes are provided in the base of a ceramic plate disposed on the shot sliding contact surface of an impeller blade, and with the stoppers attached to the holes, the stopper plate and the back surface of the ceramic plate are made of plastic. It is an impeller blade in a shot blasting device that is integrally molded.

[0008]

[Action]

 When the integrally molded impeller blade is attached to the impeller disk, the plastic covers the stopper plate attached to the hole at the base of the ceramic plate and bonds with the ceramic plate in a large area. As the strength increases, it is possible to prevent the ceramic plate from separating from the plastic and the impeller blade from coming off the impeller disk due to centrifugal force during rotation of the impeller disk, and the shot makes sliding contact with the highly wear-resistant ceramic plate. , The life of the impeller blade is improved.

[0009]

【Example】

 1 shows an embodiment of the present invention. FIG. 1A is a sectional view taken along line XX of FIG. 1B, and FIG. 1B is a front view. In the figure, reference numeral 1 denotes an impeller blade, which is similar to the conventional one in that the base portion of the impeller blade 1 is fitted in a dovetail groove formed in the radial direction of the impeller disk 2 and fixed by a screw (not shown). The impeller blade 1 is provided with a ceramic plate 3 on the surface that comes into sliding contact with the shot, and a large number of holes 4 are provided at the base of the ceramic plate 3, and stopper plates 5 are attached to the holes from both sides. And the back surface of the ceramic plate 3 are integrally molded with a plastic 6.

The forming process of the impeller blade will be described with reference to FIGS. 2 and 3. FIG. 2 is a perspective view of the ceramic plate and the stopper plate, and FIG. 3 is a sectional view of the molding die. As shown in FIG. 2, the ceramic plate 3 has the same shape as the sliding contact surface of the impeller blade 1, and has a large number of holes 4 formed in the base thereof. The ceramic plate 3 is formed by a conventional forming technique such as press forming, CIP forming, extrusion forming, and casting forming. Stoppers 5 are attached to both sides of a large number of holes 4 in the base of the ceramic plate 3. That is, the stopper plates 5 are attached to the holes 41, 43, and 45, respectively, and the stopper plates 5 are attached to the remaining holes from the opposite side of the ceramic plate 3. The ceramic plate 3 in this state is placed in the cavity 9 of the molding dies 7 and 8 shown in FIG. When the molten plastic is poured into the mold, the back surface of the ceramic plate 3 and the base portion to which the stopper plate 5 is attached are wrapped with the plastic 6 and integrally molded to form the impeller blade 1. In this case, if unevenness is formed on the back surface side of the ceramic plate 3, the joint with the plastic becomes stronger. It is also possible to use a plastic that can be mixed with two liquids and enclose the back plate of the ceramic plate and the stopper plate of the ceramic plate so as to be integrally molded.

When the impeller blade 1 integrally formed as described above is attached to the impeller disk 2, the plastic covers the clasp 5 attached to the hole at the base of the ceramic plate 3, and the ceramic plate has a large area. Since it is bonded to the ceramic plate 3, the bonding strength with the ceramic plate 3 is increased, and the ceramic plate 3 and the plastic are separated and the impeller blade 1 is separated from the impeller disk 2 due to centrifugal force when the impeller disk 2 rotates. It can be prevented.

[0012]

[Effect of the device]

 According to the present invention, even a ceramic plate having a dimensional error in molding can be easily and firmly attached to the impeller blade integrally with the molding, the life of the impeller blade can be significantly improved, and the impeller blade can be reduced in weight. The load on the rotary drive system can be reduced, and the motor etc. can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view and a front view of an embodiment of the present invention.

FIG. 2 is a perspective view of a ceramic plate and a clasp used in the present invention.

FIG. 3 is a sectional view of a molding die.

FIG. 4 is an explanatory view of a conventional shot blasting device.

[Explanation of symbols]

1 impeller blade 2 impeller disk
3 Ceramics plate 4 Mounting hole 5 Clasp
6 plastic

Claims (1)

[Scope of utility model registration request] 1. A ceramic plate disposed on the shot-sliding surface of an impeller blade is provided with a plurality of holes, and a stopper plate is attached to each hole, and the stopper plate and the back surface of the ceramic plate are made of plastic. An impeller blade in a shot blasting device characterized by being integrally molded.