SU876386A1 - Device for working parts in fluidized abrazive - Google Patents

Description

(54) APPROACH TO HANDLING DETAILS IN A PSE-DRIVEN ABRASIVE

I

The invention relates to the abrasive machining of parts of complex shape, mainly small ones, and can be used when cleaning, deburring, rounding edges, polishing and Tjn. in different fields of mechanical engineering.

A device for machining parts in a fluidized abrasive is known, comprising a working container with an abrasive placed on a gas distribution grill, a closed chamber with porous perforated walls in which the workpieces are located, and a drive for moving the chamber 1.

However, this device does not provide effective processing of parts with a low specific weight, for example, gshastmass or hollow, j since they have a low speed of movement downward towards the upward air flow, as a result of which, in this phase of the sale, parts are almost not processed. This limits the technological capabilities of the device.

The purpose of the invention is to expand the technological capabilities of the device.

The goal is achieved by the fact that the chamber is made in the form of a rotating drum with an annular working cavity, and its rotational drive is kinematically connected with the introduced, in the device, an uneven movement mechanism and a regulator.

The mechanism of the uneven movement of the drum is made crank connecting rod.

The drawing shows the device, a vertical section.

Claims (2)

The device contains a working tank 1 filled with free abrasive 2 located on the gas distribution grid 3, and a source 4 of the flow of compressed air flow Q into the air distribution chamber 5 located under the gas distribution grid 3. In the working tank 1 there is a partially closed submerged boiling abrasive layer and a chamber 6 with perforated porous walls in which the machined parts 7 are housed. The chamber 6 is kinematically connected with the drive 8 of its movement. The chamber 6 is made in the form of a rotating drum with an annular working cavity. The drum is mounted on the spindle 9, the drive 8 in rotation which is made from the hydraulic motor 10. The shaft 11 of the latter is kinematically connected to the crank 12, interacting through the mechanism 3, which converts the uniform rotation into uneven, with the regulator 14 installed in the chain of the hydraulic motor 10 of the drive 8 pin 9 in rotation. In the housing of the chamber 6, holes 15 and 16 are provided, located respectively on the inner and peripheral surfaces thereof. The shaft 17 of the spindle 9 is kinematically connected by means of a belt drive 18 to the shaft 11 of the hydraulic motor 10. The mechanism 13, which converts a uniform rotation of the shaft 17 into an uneven one, contains a connecting rod 19 of adjustable length and a rocker arm 20 fixed to the shaft 21 of the regulator 14. The hydraulic motor 10 is driven rotation from the hydraulic station 22 through the controller 14. The device operates as follows. Before starting treatment, the workpiece 7 is loaded into the chamber 6 through the existing hatch with a lid. When the device operates, the air flow Q, the passage from the source 4 through the air distribution chamber 5 and the gas distribution grille 3, causes the abrasive 2 to fluidize. From the hydraulic station 22, the working fluid is supplied through the regulator 14 to the hydraulic motor 10, which by means of a belt drive 18 drives the spindle 9 within 17 liters and the camera 6 fixed on it with the parts 7 to be processed. A crank 12 from the hydraulic motor shaft 11 10 causes the rocker arm 20 to oscillate, which is transmitted to the regulator 14, as a result of which the flow rate of the working fluid in the circuit 1 of the hydrodiagel circuit 10 varies from time to time and, consequently, the rotation frequency of the hydraulic motor 10 periodically changes la 17 schpindel 9 and chamber 6 mounted thereon with the processed detail. The flow of abrasive particles of the weighted layer 2 under the action of centrifugal forces generated in the camera 6, through the holes 15 enters its internal cavity with the parts 7 being processed and is thrown to the periphery through the holes 16, the parts are processed. When the connecting rod 19 of the mechanism 13 and the yoke 20 are in the position indicated by the solid line in the drawing, the rotational speed of the chamber 6 is maximum and, accordingly, the centrifugal forces developed by the rotating camera are maximum. Parts 7 under the action of these forces are pressed against the outer wall of the chamber, and the flow of abrasive particles passing through the chamber and the parts located in it is also maximal. When the rod 19 and the yoke 20 are in the position indicated by a dotted line in the drawing, the rotational speed of the chamber 6 is minimal and the centrifugal forces developed by it are also small, as a result of which the workpieces are detached from the outer wall of the drum and fall into its lower part. When this occurs, the mixing of parts, which improves the uniformity of their processing. The proposed device makes it possible to efficiently process parts with a low specific weight (for example, hollow ones), since the centrifugal forces acting on the parts are much larger than the inertial forces in the weighing device, and this expands its technological capabilities. Claim 1. A device for machining parts in a fluidized abrasive, containing a working container with an abrasive placed on a gas distribution grid, a closed chamber with porous perforated walls in which the workpieces are located, and a drive for camera movement, characterized in that, in order to expand the technological capabilities of the device, the camera is made in the form of a rotating drum with an annular working cavity, and its rotational drive is kinematically connected to the mechanism introduced into the device ohm irregular motion and controller. 2. The device according to claim 1, wherein the mechanism of non-uniform movement of the drum is made by a crank rod. Sources of information taken into account in the examination 1. USSR author's certificate in application N 2838650 / 25-08, cl. B 24 V 31/00, 1979.