JPH01321168A - Abrasive material injector - Google Patents

Abstract

PURPOSE: To circulatorily use abrasive for conducting a continuous polishing process by providing a dust/abrasive separator in a discharge line, connecting it to a storage tank for separated abrasive through an exit mechanism which can be sealed, and connecting this tank to an inlet opening of a nozzle. CONSTITUTION: An abrasive injection device is provided with a nozzle having an inlet opening for anabrasive, and a supply line to be connected to a pressure source, and a discharge line to be connected to a vacuum source to be introduced to a dust collector. A dust/abrasive separator provided in the discharge line is connected to a storage tank for abrasive separated through a sealable exit mechanism. Abrasive separated from dust and stored in the storage tank is supplied to the inlet opening of the nozzle to be mixed in a high speed transport air current to be injected to the surface of a work piece to be polished.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a nozzle for placement on a surface to be cleaned, the nozzle having an inlet opening for an abrasive material and having a supply line connected to a pressure source. The present invention relates to a device for cleaning surfaces with abrasive material in a high-velocity transporting air stream, consisting of a nozzle and a discharge line connected to a vacuum source and leading to a collection point.

BACKGROUND OF THE INVENTION Apparatus of the above type is often used for abrasive cleaning of arcuate surfaces such as, for example, ship and car bodies, where large displacements are required.

In order to increase the effective operating time, the present invention uses dust/
An abrasive separator is provided in the discharge line and is connected via a sealable outlet mechanism to a recycled abrasive storage tank that is connected to the inlet opening.

The abrasive material, e.g., a grid, is repeatedly cycled back to the workpiece to provide a continuous polishing process. Meanwhile, the dust is conveyed to the dust collector via the dust separator.

This particularly increases the efficiency of the device according to the invention.

A preferred embodiment of the 11η outlet mechanism is an air tank sealed by a valve and connected to a pressure source via a line.

In a particularly simple embodiment, the valve of said outlet mechanism is a non-return valve acting under the influence of gravity, whereby the pressure tank and the storage tank are connected to an adjustable bleed conduit (
bleed conduit) onto the precipitator.

The result is a particularly durable and failure-free device.

According to the invention, the dust/abrasive separator is a container with baffle means arranged therein, whereby the discharge line leading to the precipitator projects below the lowest part of the baffle means. .

The ejection means preferably protrudes into the container and comprises a sieve plate facing upwardly on its intake opening.

Finally, the lowermost baffle means are preferably formed completely or partially as a sieve.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be explained in more detail with reference to the accompanying drawings. FIG. 1 of the accompanying drawings shows a specific example of the apparatus of the present invention.

Number 1 in the figure is a spray nozzle that is moved manually or otherwise over the surface O to spray. The injection nozzle l now consists of a housing provided with a brush 2 on the surface θ and is connected on the housing to a supply line 3 which is supplied with compressed air by a pressure source 4.

The housing 1 is further provided with a connecting stamp 5 which is connected to a flexible suction hose 6 which is led down through a dust separator 7 and a dust collector, which will be described later.

The conduit 3 has an inlet opening 9 above which a storage hopper 10 for abrasive material, such as a grid of any type, is arranged.
is provided. This hopper 10 is formed with a dosing mechanism 11 that can be manually or otherwise adjusted. This mechanism is provided with a handle 12 for this purpose.

Positioned between the dust portion M'a7 and the storage tank 10 is a pressure tank 14, which communicates with the dust separator 7 via a passage opening 15 and with the storage tank IO via a passage opening 16. Each opening 15, 16 is a valve that defies the action of gravity! It can be sealed according to 7.18.

Both the pressure tank 13 and the storage tank 10 are connected to the artificial opening 20 of the precipitator 8 via a quick bleed conduit 19. Disposed between each tank and conduit 19 is a shut-off valve 21 controlled by a line 23 carrying a signal from a handle 24 at the injection nozzle.
．． It is 22.

The line 23 is also provided in the pressure supply conduit 3 as a break valve and connects the pressure source 4 to the conduit 27, respectively.
．． Pressure tank 13 and storage hopper lO via 28
The control unit 26 is connected via a branch line 25 to a control unit 26 which ensures the connection to the control unit 26.

The dust collector 8 consists of a sufficiently large capacity housing 29 in which a dust filter 30 is suspended. Suspended inside the dust filter 30 is a fan motor 31 that can exhaust the air present in the container 29.

Conduit 6 is a pressure tank! 3 and the return pipe 19 of the storage tank 10 to a location inside the housing 29 outside the dust filter 30 .

Located at the bottom of the housing 29 is a drawer 32 for collecting separated dust.

The dust separator 7 consists of a housing 33 and a suitable volume above the part from which the conduit 6 protrudes.

Arranged on the opposite side of the outlet 34 is an elastic reflection plate 35 made of, for example, rubber.

A baffle plate 36 and a sieve plate 37 are attached directly below the reflection plate 35 in a zigzag manner. Located below the sieve plate 37 is a discharge stamp 38 having an inlet 39 protected by a protruding plate part 40.

The device operates as follows.

First, a control unit 26 is placed in the conduit 3 in fluid communication with the pressure source 4 in order to form a predetermined volumetric flow rate of air in the conduit 3 at a predetermined pressure. The abrasive material with the dose m is in the opening 11
flows out of the storage tank 10 through the conduit 3;
It reaches the injection nozzle l along with the air flow. As a result of the injection of the nozzle located in the housing l, the air stream together with the abrasive material reaches a predetermined velocity and is forced against the surface 0, resulting in a predetermined abrasive action and cleaning the surface 0. Inside the housing l, a vacuum is created, discharging a certain amount of air, grid and dust via the stamp 5 and the conduit 6. This mixture is conveyed at a predetermined speed into the dust separator 7, against which the grid and dust are forced as the plate 35 has an elastic function that prevents excessive wear of the tank inner walls. Nevertheless, the impact action that is present causes separation between the dust and the grid particles, which then fall downwardly over the zigzag-like baffle plate 36, so that the sieve 37 consequently removes the grid particles of high specific weight from the tank 7. Sift to the bottom. The dust particles are discharged together with the air at a low velocity into the precipitator 8 via the tube 6°. The suction opening 39 prevents the grid from falling downwards by the guard 38 so that with the exhaust airflow little or no grid is carried away through the tube 6°. Within the dust collector 8, the dust falls into a tray 32, while the air is filtered through a filter 30 and can be periodically disposed of via a removable drawer 32.

Under the influence of gravity, the valve! 7 is placed at the bottom, so
The regenerated grid particles in tank 7 are opened! 5 into the pressure tank 13. Here, first, the tank! Assuming atmospheric pressure in 3, a vacuum from tube 6 is substantially present in this tank. After some time, the conduit 27 is placed under pressure from the pressure source 4 under the control of the control unit, so that the tank 1
3 receives this pressure and immediately pushes the valve 17 upwards so that the opening 15 closes.

Since the valve 18 remains sealed off the opening 16 in the operating position, pressure from the pressure source 10 is already prevailing in the storage tank 10 due to the pressure in the conduit 3 . This pressure is rapidly supplied by the hopper IO via a conduit 28 placed in direct communication with the pressure source 4 by the control unit 26. The regeneration grid remains in the pressure tank 13 for the time being.

As soon as the operator reverses the switch 24 at the injection nozzle, the control unit 26 is adjusted so that the conduit 3 is closed from the pressure source 4 and the injection nozzle 1 is not activated. In this state, the valve 21.22 in the bleed conduit 19 opens and the pressure in the tank IO, 13 increases immediately. Each valve under the influence of gravity! 7.18 consequently falls downwards and then opens the passage opening 15.16, so that the grid is a storage tank! It can drop to 0. -dan,
When pressure is again supplied into the conduit, the control unit 26 is adjusted such that the conduits 27.28 are again under pressure and therefore the tanks IO1!3 are under pressure, so that the valve 17. +8 returns to closed position.

As is clear from the above, the valve t7.18 is opened and closed each time the injection nozzle 1 is turned on and off, and these operations occur periodically. This ensures that the storage tank 10 is always supplied with sufficient grid material and that this grid material is periodically conveyed via the dust separator 7. The loss of grid material is consequently reduced to a minimum, with the grid material being reduced only as a result of wear and resulting dust formation. The dusted grid is usually carried away to the precipitator 8 together with other dust.

The present invention is not limited to the above specific examples.

For example, valves 17, 18 can be replaced by any other valves, such as electromagnetic or pneumatic types. In the latter case, the pressure tank 13 can be omitted and the dust collector is connected directly to the storage hopper 10.

The dust collector 8 can, of course, take any form.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one specific example of the present invention. The main symbols in the figure mean the following. 4 ・1r:, power source, 7... dust separator, 8...
Collection I! ? ! container, IO...storage tank, 20...inlet opening, 24...injection nozzle. Patent applicant L.T.N. International
B Beichi

Claims (7)

[Claims] (1) A nozzle for placement on the surface to be cleaned, the nozzle having an inlet opening for an abrasive material, a supply line connected to a pressure source, and a nozzle connected to a vacuum source to collect dust. Apparatus for cleaning surfaces with abrasives in a high-velocity conveying air stream comprising a discharge line leading to a vessel, a dust/abrasive separator being provided in the discharge line, and a sealable outlet. A surface cleaning device, characterized in that it is connected to a separate abrasive storage tank via a mechanism, the storage tank being connected to the inlet opening. (2) The device according to claim 1, wherein the outlet mechanism is formed by an air tank which can be closed by a valve and which can be arranged in connection with a pressure source via a line. (3) The valve of the outlet mechanism is a check valve acting under the influence of gravity, and the air tank and the storage tank are connected to the precipitator via an adjustable bleed conduit. ) or the device described in (2). (4) Claims in which the dust/abrasive separator takes the form of a container having baffle means disposed therein, and wherein the discharge line leading to the dust collector projects below the lowest part of the baffle means. The device according to any one of items (1) to (3). (5) A device according to claim 4, wherein a portion of the discharge line projecting into the container is provided with a sieving plate facing upwardly over its suction opening. (6) Claim No. 4, wherein the lowest part of the baffle means is formed completely or partially as a sieving sieve.
and the device described in (5). 7. The apparatus of claim 1, wherein both the air tank and the storage tank are connected to the precipitator inlet opening via a quick bleed conduit.