SU1514592A1 - Abrasive-jet device - Google Patents

Description

The invention relates to devices for jet abrasive machining of parts and can be used as a hand tool in the manufacture and repair of steam turbine rotors, metallurgical equipment, ship bottoms, etc. The device contains an abrasive thickener in the form of a housing 1 with an L-shaped internal cavity 2, to top

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the horizontal part of which is fed abrasive pulp through the pipe 3, and to the lower vertical part of the pipeline 5 - energy. The end of the pipeline 5 has a flat-nozzle 6, for example, an elliptical shape. Abrasive-containing pulp is fed into the housing 1. Due to the structural design of the housing with the L-shaped cavity with the ratio of the cross-sectional areas of the housing 1 and the opening for supplying the pulp at the point of their joining in the interval 5-10, the velocity of the pulp decreases sharply, resulting in intensive precipitation of abrasive particles from the pulp, which are then picked up by the energy carrier 8 and directed to the surface to be treated, the liquid is pressed in the upper part of the housing 1 and through the opening is drained beyond devices. 3 il.

with

5Ts „„ 1514592

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The invention relates to devices for abrasive blasting of parts that implement mainly cavitation pulsed hydroabrasive processing method, and can 5 be used as a portable hand tool for removing burrs, scale, rust, old paint, salt deposits from the surface of various products during their manufacture and repair ( steam turbine rotors, metallurgical equipment, ship bottoms, etc.).

The purpose of the invention is to reduce the size and increase the efficiency of the abrasive blasting device when used as a portable hand tool.

1 shows a schematic 2θ of the proposed device, a section; Fig. 2 shows the node I in Fig. 1. Fig. 3 shows the section A-A in Fig. 2.

The device contains an abrasive thickener, made in the form of a housing 25 with an L-shaped internal cavity 2. To housing 1, a slurry pipe 4 is connected to its upper horizontal part through pipe 3, and a pipeline 5 for supplying a liquid-energy carrier to the lower vertical part. Pipeline 5 energy at its end has a flat-nozzle 6, for example, with an ellipse output section. In case 1, from the side of the slurry pipeline 4, hole 5, 7, is made for draining water, in particular, of rectangular shape. The ratio of the areas of cross-sections of the housing 1 and the slurry pipeline 4 in the place of their joining is in the range of 5-10. '

The operation of the housing 1 in the proposed device is based on the effect of the existence of a critical speed when the abrasive-containing pulp-45 pus moves along the hydraulic path. It is known that when the pulp speed decreases, a moment comes when the abrasive particles freely fall onto the pipe wall, i.e. 50 stop moving with the liquid. In the proposed technical solution, this is ensured by the ratio of the cross-sectional areas of the housing 1 and the slurry pipeline 4 at their joining point 55, which is in the range of 5-10. This means that the speed of the pulp in case 1 is 5-10 times less than the speed of the pulp in pulg 4

the wire 4. As a result, when the pulp enters the body 1, the abrasive particles are deposited, i.e. descend along arrow B, skirting around the perimeter a flat jet 8 of energy carrier flowing out of the nozzle 6. Most of the liquid that was part of the pulp in this case is separated in the upper part of the housing 1 and flows in the direction of arrow B through the opening 7 in the wall of the housing 1 behind device limits. The mixing of a liquid energy carrier with condensed pulp is carried out due to the effects of cavitation at the interface of these media. Working hydroabrasive jet 8 expires from the cavity of the housing 1 in its lower part through the slit 9, oriented vertically, as the jet flowing from the nozzle 6. The pipe 5 of the energy carrier and slurry pipe 4 are connected by a vibration-isolating pad

10 (it can be made of wood or plastic with rubber pads). On the side opposite to the housing 1, on the pipeline there is a set-> knob 11, which serves together with the pad 10 to hold the device in hand during operation. Handle

11 is also made from vibration-proofing material. On the handle 11 opposite the index finger of the person working with the tool, there is a button 12 for controlling the supply of a liquid-energy carrier to the pipeline 5. The handle 11 is made of two halves connected by screws 13. The button 12 has an electric wire 14 connecting it to the electrical unit control the flow of fluid-energy.

From the supply side in front of the pad 10, the pipeline 5 of the energy carrier is bent at an angle of 90 ° in order to facilitate work with the device, namely, to reduce its weight. Due to the fact that the pipeline 5 is supplied with a high-pressure liquid (10 15 MPa), its mass, due to the considerable thickness of the walls, is substantial. In the presence of a bend of the pipeline at an angle of 90 °, the high-pressure hose that supplies the energy carrier to the device lies on the floor (on the ground), i.e. does not weigh the device.

The proposed abrazivostruynoy

The device works as follows.

5 1514592 6

Abrasive-containing pulp is first fed into the device, which enters the body 1 through the pulp line 4. In the body 1, the pulp speed decreases by the ratio of the areas of the pulp line 4 and the wall of the body 1 in the place of their connection (sudden expansion). As a result, intensive precipitation of abrasive particles from the pulp occurs. Particles descend into the lower part of body 1 in the direction of arrows B. The liquid that was part of the pulp is pressed into the upper part of body 1 and a rectangular hole 7 along the arrow B flows out of it through the device. 2-3 seconds after the pulp feed, the device enters the mode and is ready for operation. After that, pressing the button 12, working with the tool turns on the supply of liquid-energy carrier to the pipeline 5. A nozzle 6 installed at the end of the pipeline 5 converts the fluid flow into a flat jet 8. The high-pressure jet 8 passes through the layer of abrasive particles in the lower part of the housing 1, saturated with abrasive, i.e. turns into waterjet, which is sent to the part to be cleaned. After the end of cleaning or when moving to another part, the worker releases the button 12 on the handle 11 and the supply of energy is stopped.

If the stop is short, then there is no need to turn off the flow of pulp. In this case, the incoming pulp is separated until the abrasive particles fill 80 90% of the volume of the housing 1, and after that the pulp expires from the device through the opening 7. With the subsequent switching on of the supply of liquid-energy carrier in the housing 1, the stock of abrasive and device are already prepared

instantly begins to work effectively, i.e. the device does not need preparatory time.

The degree of thickening of the abrasive-containing pulp in the housing 1 is determined by the ratio of the areas of the L-shaped housing 1 and the pipeline 4 in the place of their joining. This ratio is recommended to be performed in the range of 5-10. The most acceptable is the ratio of areas of about 8, since the speed of the pulp in the pipelines usually exceeds the critical speed

5 not more than 2-5 times, i.e. in this case, an acceptable thickening of the pulp is provided with a relatively small size of the body 1. The proposed abrasive blasting device

, θ works effectively when its position in space changes from horizontal down to 90 °, i.e. vertically and upward at an angle of 75-80 °.

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Claims (1)

Claim An abrasive blasting device containing an abrasive thickener, comprising a housing with connections for supplying abrasive-containing pulp and a liquid-energy carrier, as well as holes for draining water and pulp, characterized in that, in order to reduce overall dimensions and increase efficiency in Cavi: 5 operating mode, the housing the thickener is made with an L-shaped cavity, the upper horizontal part of which is connected to the nozzle for supplying abrasive-containing pulp, θ and lower vertical - with a nozzle for supplying a liquid-energy carrier, while the ratio of the areas of cross sections of the thickener body and the nozzle for supplying abrasive-containing pulp in the place of their joining is in the range of 5-10. 1514592 φυ? .2