RU2534702C2 - Universal grinding head - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to abrasive processing and can be used in hand-held angular stone processing machines. Grinding head comprises case, drive shaft and conical reduction gear with two driven gears fitted on aligned vertical shaft and bushing. Two abrasive wheels are fitted and aligned on the latter to run in opposite directions, inner wheel being permanently pressed against the machine article by the spring. Through bore is made in vertical shaft to feed surfactant of powder abrasives on article surface. Abrasive wheels feature identical areas of contact with processed article and are fitted in guard jacket with pipe for connection via flexible hose with exhaust device.

EFFECT: equal torque at abrasive wheels.

1 dwg

Description

The present invention relates to construction equipment, namely to manual angle grinders used in the processing of natural as well as artificial stone. It can be used in civil and industrial construction, as well as when performing repair work.

Known hand-held grinders of foreign manufacture of angular designs (French patent N 2647044, class IPC V24V 27/08 1990, German patent N 3717723 A1, class V24V 23/02 12/08/08), equipped with one abrasive wheel.

Closest to the proposed invention is the angle hand grinder according to patent RU 115704 U1, B24B 23/02, 05/10/2012.

The disadvantages of the prototype are the following: since two abrasive wheels are fixed on this grinder, rotating in opposite directions, of different diameters, the torques (friction moments) on these wheels have different sizes, as a result of which the machine is unstable on the product, causing scratches, risks and other defects, and the damping of the difference in torques (friction moments) is carried out due to the efforts of the operator; this grinder does not provide the possibility of suctioning dust directly from abrasive wheels.

The objectives of this invention are to ensure equality of torques (friction moments) on abrasive wheels mounted on the grinding head; enabling dust extraction directly from abrasive wheels.

The problem is solved as follows. In the present invention, the equality of torques (friction moments) is ensured due to the fact that two abrasive wheels are mounted coaxially with the possibility of rotation in opposite directions and with the same areas for contact with the workpiece, and there is a nozzle for dust extraction in the casing enclosing abrasive circles for connection with a flexible hose to a suction device.

This grinding head can be a replaceable working body of the used grinding machines with a flexible shaft.

The proposed grinding head consists of a housing, a bevel gear reducer, a drive shaft and an actuator in the form of two abrasive wheels mounted coaxially and enclosed by a enclosure.

The bevel gear reducer (Fig. 1) consists of three gears 2, 3, 4. The driving gear 2 is rigidly fixed to the drive shaft 1, the gear 3 is on the shaft 5, and the gear 4 is mounted on the sleeve 6, which is coaxially mounted on the shaft 5 with the possibility of rotation relative to it. Gear 3 through the shaft 5 transmits rotation to the inner abrasive wheel 7, and gear 4 through the sleeve 6 to the outer abrasive wheel 8. In this case, the abrasive wheels rotate in opposite directions. In the lower part of the shaft 5 there is a spring 9, through which it is possible axial movement of the abrasive wheel 7 relative to the abrasive wheel 8 and the constancy of its pressing against the work surface.

The vertical shaft 5 has a central through hole along the entire length, which is designed to supply surfactants or PAM, providing increased grinding performance. Using valve 10, it is possible to control the supply of surfactants or PAM to the product processing zone. The enclosure 11 has a nozzle 12 connected by a flexible hose to a suction device (not shown in the drawing).

The operation of the device.

The drive shaft 1, receiving rotation from an electric motor (not shown), rotates gears 3 and 4 by means of gear 2, and the latter transfer rotation to abrasive wheels 7 and 8 through shaft 5 and bushing 6. Spring 9, through which the inner abrasive wheel 7 extended relative to the end of the abrasive wheel 8, allows you to start processing the product with an abrasive wheel of a smaller diameter, which reduces the effort on the hands of the operator. As the inner abrasive wheel 7 is heated, the product is also treated with the external abrasive wheel 8. At the same time, a suction device is switched on to operate the abrasive wheel rotation drive motor.

Claims (1)

A grinding head for processing products comprising a housing, a drive shaft and a bevel gear with two driven gears mounted on a coaxially mounted vertical shaft and a sleeve on which two abrasive wheels are coaxially mounted to rotate in opposite directions, the inner of which is mounted with the possibility of constant pressing to the workpiece by means of a spring, while in the vertical shaft there is a central through hole for supplying surface-active products to the product substances or powdered abrasive materials, characterized in that the abrasive wheels are used, having the same area intended for contact with the workpiece, the abrasive wheels installed in the enclosure with a pipe for connecting a flexible hose to a suction device.