RU200115U1 - Abrasive Blasting Machine Loading Device - Google Patents

Abstract

The utility model refers to abrasive blasting and is intended for processing the external and internal surfaces of parts and structures. The technical result of the utility model is to ensure the stability of the supply of fine abrasive from the reservoir to the mixer. The technical result is achieved due to the fact that the proposed loading device of the apparatus for abrasive blasting, containing a reservoir for the abrasive, having an inner surface tapering towards the mixer of the ejection type. On the tapered inner surface of the tank along a helical line, a tubular element is fixed, connected to the outer branch pipe for air supply. The helix has at least one turn. The tubular element is provided with openings towards the center of the reservoir. In the upper part of the tank there is a nozzle for air suction. The use of a loading device can improve the efficiency of abrasive blasting. 1 ill.

Description

Technology area

The utility model relates to abrasive blasting and is intended for processing the external and internal surfaces of parts and structures

State of the art

Known sandblasting apparatus [RF Patent No. 190559, publ. 07/03/2019], including a hopper, a loading hatch, a partition dividing the hopper into two parts in height, a dosing device, a compressed air supply device made in the form of a supply connection, a device for removing an abrasive-air mixture, made in the form of a discharge connection. The dosing device is made in the form of a set of dosing tubes installed in the partition at a distance from the bottom of the hopper with the possibility of changing this distance in operation.

The disadvantage of such a device is that when using a fine-grained abrasive with low fluidity, at the inlet of the loading tubes, the inlet holes of the tubes will be clogged due to the obstruction of the abrasive.

Known pressure head unit for abrasive blasting of products [RF Patent No. 2364495, publ. 20.08.2009]. The device contains a vertically mounted pressure tank for collecting abrasive, having a conical tapering part at the bottom, to which an abrasive distributor with one or more fittings is connected. The mentioned fittings are connected with the nozzles for supplying the abrasive-air mixture. A branch pipe made of elastic material and having upper and lower flanges is installed between the pressure tank and the abrasive distributor coaxially with the tank. The upper flange of the branch pipe is fixed on the tapered tapered part of the tank, and the lower flange of the branch pipe is attached to the abrasive distributor. A vibrator is installed on the lower flange of the branch pipe. As a result, a uniform distribution of the abrasive material between the nozzles is ensured and it is prevented from getting stuck in the abrasive distributor.

The disadvantage of such a device is its cumbersomeness, the presence of vibration during operation, for the implementation of which an additional drive is required, the installation of appropriate anti-vibration devices, etc. This is not suitable for portable abrasive blasting machines such as those used on building surfaces.

The closest technical solution is an aero-abrasive mixer device for abrasive-jet surface treatment [RF Patent No. 2222421, publ. January 27, 2004]. The mixer contains a reservoir for abrasive, which has an inner surface tapering to an ejection type mixer, a dispenser including a slide rod and a seat with an axial channel communicated with the mixer. Means are provided for the mixer to rotate freely relative to the outlet of the abrasive vessel and to move the seat in the axial direction to regulate its position relative to the position of the slide rod. In the latter, a through channel is made along its entire length for blowing out the dispenser. The spool rod is installed with the possibility of separate rotation and axial reciprocating movement. The means for loosening the abrasive is made in the form of ribbing on the outer part of the spool rod outside the zone of interaction with the seat.

The disadvantage of this solution is the complexity of the design, requiring a special drive of the moving elements of the mixer. Also, when using a finely dispersed abrasive of low hardness, for example, sodium carbonate, local mechanical loosening due to the ribbing of the brush is insufficient for stable loosening of the abrasive throughout the volume, and this, in turn, does not ensure the stability of the flow of the abrasive into the ejection type mixer.

Disclosure of a utility model

The technical result of the utility model is to eliminate the disadvantages inherent in the prototype, as well as to ensure the stability of the supply from the reservoir to the mixer of fine abrasive.

The technical result is achieved due to the fact that the proposed loading device of the apparatus for abrasive blasting, containing a reservoir for abrasive, having an inner surface tapering towards the mixer of the ejection type. On the tapered inner surface of the tank along a helical line, a tubular element is fixed, connected to the outer branch pipe for air supply. The helix has at least one turn. The tubular element is provided with openings towards the center of the reservoir. In the upper part of the tank there is a nozzle for air suction.

List of drawings

The attached figure shows the structure of the blasting machine loader.

Implementation of the utility model

The loading device consists of a tank 1 for abrasive, with a tapering surface 2, connected to an ejection type mixer 3. On the tapered inner surface of the tank along a helical line in the direction of the outlet of the tank, a tubular element 4 is installed, not reaching the outlet of the tank. Holes 5 are made on the tubular element. The holes are directed to the center of the tank. The tubular element is connected to the outer pipe 6 for air supply. In the upper part of the reservoir there is a branch pipe 7 for air suction.

The boot device works as follows. After loading the abrasive into the reservoir 1, the air supply to the tubular element 4 is switched on. At the same time, the air suction through the branch pipe 7 is switched on. Moreover, the volumetric flow of the air injected into the reservoir 1 and the air extracted is the same. The air injected into the tubular element 4 through the holes 5 creates a kind of pseudo-boiling flow, which excludes the formation of caked areas of the abrasive and significantly increases its fluidity. When air, which forms the basis of the working mixture, is supplied to the ejection mixer, a stable concentration in the working mixture is ensured. Experimental operation of the loading device of the abrasive-blasting machine using sodium carbonate as an abrasive has shown high reliability and uninterrupted supply of abrasive when processing surfaces from a wide variety of materials. A conventional vacuum cleaner is used as a means for supplying and sucking air in the hopper of the proposed loading device. Thus, the use of the loading device of the apparatus does not require any significant costs and provides a tangible effect, which consists in the stability of the supply of abrasive during abrasive blasting, which can increase the efficiency of abrasive blasting.

Claims (1)

A loading device for an abrasive-blasting machine containing a tank for abrasive with an inner surface tapering towards the ejection type mixer, characterized in that a tubular element is fixed on the tapered inner surface of the tank along a helical line towards the outlet of the tank, connected to the outer nozzle for air supply, and the helical line has at least one turn, and holes are made on the tubular element towards the center of the tank, while a branch pipe for air suction is fixed in the upper part of the tank.

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