DE4012435A1 - Sand blasting installation using wet sand - has sand contained in pressure vessel with outlet connected to nozzle - Google Patents

Abstract

A sandblasing installation which uses wet sand, has a pressure vessel (10) to contain the wet --sand. The pressure vessel (10) has a funnel (12) through which sand and water can be poured into the vessel. The pressure vessel (10) has an outlet (16) connected to a pipe (21). This pipe (21) is connected to a flexible hose (18) which is fitted with a nozzle (44) for the jet of wet sand. An air compressor (20) has its outlet pipe (22) connected to the pressure vessel (10) at a point above the water level so that an internal pressure is maintained to drive the sand out through the nozzle (44). USE - Sandblasting with wet sand.

Description

The invention relates to a wet sand heater.

DE-OS 32 39 429 is already wet sand spotlight with an airtight, damp sand receiving pressure vessel, a device for Introducing sand into the container, a facility for introducing water into the container, an outlet to release a sand / water mixture from the Container and a sandblasting hose known.

In the proposal according to DE-OS 32 39 429 this is done Expelling the sand / water mixture from the container by introducing pressurized water into it.  

In the previously known device, water with nor times the household pressure supplied to the container. At a such a procedure is the achievable outlet pressure of the However, blasting media is usually not sufficient. It is therefore regularly a device for increasing the Water pressure upstream to a working pressure of to reach about 7 bar.

The invention is based, the vorbe knew wet sandblasters in such a way that without using a Ge which increases the water pressure advises the possibility of cleaning the wet sand sands blasted area with sufficient water pressure is made possible.

According to the invention, this object is achieved in that an air compressor is provided, which has a first Pipeline one above one on one on the Moist sand on top of the water layer Forms air pressure cushion.

Preferred is an education that is marked through a second one, from the air compressor to the sand Pipe carrying blasting hose for feeding serving as a blowing agent for the sand / water mixture Air.

It is also proposed that between the outlet and a siphon-like tube from the blasting hose cut is provided.  

In a further preferred embodiment, one with a locking slide provided third pipeline see the layer of water with the sandblasting hose connects.

Another suggestion is one with an ab stopcock provided, the water layer with the outlet the fourth pipe connecting the container see.

It is further proposed the second pipeline to be equipped with an air shut-off valve.

Finally, the third pipe is proposed line with one lying on the water layer Drain float to be provided.

The invention is described below with reference to a drawing explained. It shows:

Fig. 1 shows a first embodiment of the inven tion, and

Fig. 2 shows a second embodiment of the inven tion.

Fig. 3 shows a third embodiment of the inven tion.

The wet sand heater, as it is shown in the figures, consists of a pressure vessel 10 and a device for supplying sand, which consists of a vibrating screen placed on an inlet 26 of the container, a water supply line opening above a hopper 12 and an inlet 26 ver closing cone 26 there . In the upper portion of the pressure vessel 10 opens in Fig. 1 and 3, a first conduit 22 which is acted upon by an air compressor 20, with compressed air.

In the lower area of the pressure vessel 10 there is an outlet 16 through which the sand / water mixture is discharged from the vessel, with a siphon-like pipe section 21 connecting to the outlet 16 in FIGS . 1 and 2. At the end of the siphon-like pipe 21 , a pipe opens 24 , which leads to the air compressor 20 .

After filling the pressure vessel 10 with water and sand, the wet sand 25 sets down off sand on the wet 25 is a water layer 27. Over the water layer 27 is a compressed air cushion 28 , the pressure of which is determined by the compressor 20 and which exerts a considerable pressure on the water layer 27 . This pressure leads to the sand / water mixture (the damp sand 25 ) being pressed through the siphon-like tube section 21 into the blasting hose 18 .

The further pipeline 24 , which connects the compressor 20 with the blasting hose 18 , causes a supply of compressed air, which serves as a blowing agent and drives the sand / water mixture under high pressure through the blasting hose to the blasting nozzle 44 .

In a preferred embodiment, as shown in FIG. 3, the second pipeline is provided with a first gate valve 56 and a controllable ball valve 52 .

In a preferred embodiment, as shown in FIG. 3, a third pipeline 48 connects the water layer 27 which forms in the container 10 in the region of the mouth of the second pipeline 24 with the sandblasting hose 18 . The third conduit 48 is provided with a bearing on the water layer 27 drain float 60, 27 adapts to the respective water level of the water layer in each case. The third pipe 48 is provided with a gate valve 46 .

A fourth pipeline 50 , which is provided with a finely adjustable ball valve 54 , connects the water layer 27 to the region of the outlet 16 of the container 10 .

By a corresponding setting of the ball valve 52 in the second pipe 24 , he required differential pressure is effected, in which the sand / water mixture from the container 10 passes through the outlet 16 in the sandblasting hose 18 and from which through the second pipe 24 in air introduced into the sandblasting hose.

If after the completion of the actual wet sand blasting work is desired to wash off the blasted surface with water, the inflow from the outlet 16 to the sandblasting hose 18 is interrupted by blocking the valve 58 . The gate valve 46 is opened ge. In this state, the water of the water settling above the sand / water mixture stratifies through the third pipe 48 into the sand blasting hose 18 , the pressure of the air cushion 28 being formed by the compressor 20 via the first pipe 22 , which promotes the promotion of water. This water of the water layer 27 is then optionally conveyed through the jet hose 18 by the air entering via the second pipeline 24 and exits through the nozzle 44 .

The proposed design of a wet sand blaster thus makes it possible, without the provision of a special water compressor, to wash off the previously damp-sand blasted surface with pure or essentially pure water and / or to thin the sand / water mixture emerging from the opening 16 with water, that a sufficient fine dust binding is guaranteed, the required pressure being supplied by the air compressor 20 .

Unlike with previously known systems, is therefore a special water compressor not required.

It goes without saying that it is possible, after the water in the water layer 27 has been used up, after the first pipeline 22 has been shut off, to refill water into the container.

It goes without saying that, instead of sand, another granulate can also be used - in a manner known per se.

In contrast to the embodiment shown in FIG. 1, the first pipeline 22 can also open at the bottom into the container 10 , preferably in the area of the outlet 10 , so that the rising air stream loosens the damp sand in this area, as shown in FIG . 2 is shown.

The required differential pressure between the pressure of the air cushion 28 and the opening of the second pipe 24 into the blasting hose 18 can be brought about by the provision of a corresponding pressure reducer in the second pipe 24 . In general, however, the frictional pressure loss in line 24 , through which a multiple of the amount of air passed through first conduit 22 flows, will be sufficient to cause a differential pressure that will cause the sand / water mixture 25 to flow out from the container 10 through the siphon-like section 21 to the blasting hose 18 .

Claims (7)

1. moist sandblaster with an airtight seal, damp sand ( 25 ) receiving pressure vessel ( 10 ), a device ( 12 ) for introducing sand into the container ( 10 ), a device ( 12 ) for introducing water into the container ( 10 ), an outlet ( 16 ) for letting a sand / water mixture emerge from the container and a blasting hose ( 18 ), characterized in that an air compressor ( 20 ) is provided which is above a first pipe ( 22 ) an air pressure cushion ( 28 ) arranged on a layer of water ( 27 ) resting on the wet sand ( 25 ). 2. Wet sand heater according to claim 1, characterized by a second, from the air compressor ( 20 ) to the sandblasting hose ( 18 ) leading pipe ( 24 ) for supplying air as a blowing agent for the sand / water mixture. 3. Wet sand heater according to one of the preceding claims, characterized in that between the let ( 16 ) and the blasting hose ( 18 ) a siphon-like tube section ( 21 ) is provided. 4. Wet sandblaster according to one of the preceding claims, characterized in that a third slide ( 48 ) is provided with a locking slide ( 46 ) which connects the water layer ( 27 ) to the sandblasting hose ( 18 ). 5. Wet sand heater according to one of the preceding claims, characterized by a stopcock ( 54 ) provided, the water layer ( 27 ) with the outlet ( 16 ) of the container connecting fourth pipeline device ( 50 ). 6. Wet sand heater according to one of the preceding and workman surface, characterized in that the second pipe is provided with an air shut-off valve ( 56 ). 7. Wet sand heater according to one of the preceding claims, characterized in that the third pipe line ( 48 ) with a on the water layer ( 27 ) lying drain float ( 60 ) is provided.