RU2218215C2 - Device for cleaning surfaces of metal articles - Google Patents

Abstract

FIELD: cleaning surfaces of metal articles; preparation of surfaces for painting with powder-like paints. SUBSTANCE: proposed device includes working chamber with circulating unit, waste receiving chamber, dynamic chamber communicated with working chamber; this chamber is closed and increased pressure may be built-up in it. Working chamber and waste receiving chamber are communicated and may be disconnected; they are divided by partition whose height is lesser than height of working chamber walls. EFFECT: improved quality of cleaning; simplified construction. 4 cl, 1 dwg

Description

 The proposed device relates to the field of production of metal products and can be used to conduct the process of preparing the surface of metal products of arbitrary shape before painting them with powder paints.

 The technological process of surface preparation before painting with powder coatings is traditionally carried out on through-type aggregates by the method of spraying acid-containing solutions.

 The fundamental disadvantages of traditional methods of surface preparation of products on nozzle-type installations include the impossibility of preparation for painting products of complex shape (cylindrical containers). The surface areas inaccessible for direct exposure to the spray jet remain untreated and after the formation of the coating film of the unpainted surface, defects remain not only in untreated places, but also in other areas.

 In addition, the high cost of the equipment itself, as well as the high cost of production when cleaning products using this method, are among the disadvantages of the technology for cleaning products on through-flow units. The need to combat corrosion of other products requires a furnace for quick drying of products. Typically, such furnaces consume electricity of at least 30 kW. In ventilation equipment requires the installation of special filters that capture harmful substances.

 The use of acid-containing solutions involves the process of disposal of the spent composition, which also increases the cost of finished products.

 Known surface preparation technologies in baths with acid-containing liquids have the same drawbacks: the need for repeated washing of parts with water, their further drying and disposal of treated solutions.

 Closest to the proposed one is a device for cleaning the surfaces of products containing a working chamber and a waste discharge chamber, a wave producer and a tray for removing small contaminants are placed in the working chamber, and the chambers are communicated at the bottom for removing heavy waste (see RF patent 1450207, B 08 In 3/04, publ. 12.09.1995).

 The disadvantages of the known device are its complexity due to the presence of mechanical moving parts of the wave product and its drive, as well as the incomplete removal of light impurities due to the fact that only a part of light impurities gets into the tray.

 The task to which this proposal is directed is the creation of a plant with simplicity, low cost and low cost of production and high quality cleaning, as well as eliminating the use of complex mechanisms.

 The technical result consists in improving the quality of cleaning by providing a more complete removal of light impurities, as well as in the elimination of complex mechanisms by replacing them with a source of compressed air.

 The specified technical result is achieved by the fact that the device for cleaning products contains a dynamic chamber, a working chamber and a waste collection chamber, a dynamic chamber is in communication with the working chamber and is closed with the possibility of creating increased pressure in it, the working chamber and the waste collection chamber are communicated with the possibility of separation and separated by a partition, the height of at least part of which is less than the height of the walls of the working chamber, and the latter is equipped with a device for creating fluid circulation.

 In addition, the dynamic camera and the working camera can be separated by a partition with holes in the lower part, providing communication of these cameras.

 In addition, the communication of the working chamber and the waste collection chamber can be provided by means of a tube with a locking element, at the end of which, located in the waste collection chamber, a filter is installed.

 In addition, in the working chamber it is advisable to place a tray for collecting heavy waste.

 The drawing shows a General view of the proposed installation.

 The installation for cleaning the surface of metal products of arbitrary shape in the process of preparing for painting with powder paints is an installation with a reverse cycle of an aqueous solution of special surface-active substances (surfactants).

 In the embodiment shown in the drawing, the installation is made in the form of a single tank 1, made, for example, of stainless steel and divided by partitions 2 and 3 into three chambers: a dynamic chamber 4, a working chamber 5 and a waste collection chamber 6, which are communicating vessels. In another embodiment, the dynamic chamber may be made in the form of a separate container in communication with the working chamber by the pipeline, however, the embodiment depicted in the drawing is preferred.

 The partition 2, separating the dynamic and working chambers 4 and 5, has in the lower part of the hole 7, communicating cavity of these chambers. The dynamic chamber 4 is closed to ensure that it creates increased air pressure.

 The partition 3 separating the working chamber 5 and the chamber 6 for collecting waste or part of this partition has a height less than the height of the walls of the working chamber 5.

 In the lower part of the tank there is a tube 8 with a locking body - a crane 9, which communicates the cavity of the working chamber and the waste collection chamber 6. At the end of the tube 8, located in the chamber 6 for collecting waste, a filter (not shown) is installed.

 The working chamber 5 is equipped with a means of supplying compressed air to ensure vortex circulation of liquid in the chamber. Any known means of the indicated purpose can be used, for example, in the opposite corners of the working chamber 6 can be placed diagonally directed tubes for supplying compressed air (not shown).

 At the bottom of the working chamber 5 is placed a pan to facilitate the collection and disposal of heavy waste (not shown).

 Installation works as follows.

In the working chamber 5 is placed the product or products. When the shut-off valve 9 is open, the installation is filled with an aqueous surfactant solution. The shut-off valve 9 is closed. The aqueous solution is heated to 40-50 ^o C. Compressed air is supplied to the working chamber 5 to ensure vortex circulation of the liquid, while the products are cleaned of dirt, oils and oxides.

 After the cleaning process in the dynamic chamber 4 above the surface of the liquid creates additional air pressure. Since the dynamic chamber 4 and the working chamber 5 are connected to each other by openings 7, and the shutoff valve 9 on the tube 8 is closed, the liquid level in the dynamic chamber 4 lowers, in the working chamber 5 rises, and in the waste collection chamber 6 remains at the initial level . After the liquid level in the working chamber 5 reaches the upper boundary of the partition wall 2, substances with a density lower than the density of water from the surface of the liquid in the working chamber 5 are discharged into the waste collection chamber 6. Then, the supply of additional air pressure to the dynamic chamber 4 is stopped, the normal pressure is established in it, the shut-off valve 9 opens, as a result of which the liquid level in the installation chambers returns to normal. The cleaned product is removed from the working chamber 5 and after blowing with compressed air enters the painting.

 A filter with removable elements mounted on the tube 9 accumulates waste.

 The presence of time-based surfactants makes it possible to refuse both the quick drying of steel products (corrosion of steel products after processing was not observed indoors at room temperature), and the installation of special filters to discharge harmful substances.

Claims (4)

1. A device for cleaning products, containing a working chamber communicated with each other with means for creating circulation and a waste collection chamber, characterized in that it is equipped with a dynamic chamber in communication with the working chamber and made closed with the possibility of creating increased pressure in it, a working chamber and the waste collection chamber is communicated with the possibility of separation and separated by a partition, the height of at least part of which is less than the height of the walls of the working chamber. 2. The device according to claim 1, characterized in that the dynamic chamber and the working chamber are separated by a partition with holes in the lower part, providing communication of these cameras. 3. The device according to claim 1 or 2, characterized in that the communication of the working chamber and the waste collection chamber is provided by means of a tube with a locking member, at the end of which, located in the waste collection chamber, a filter is installed. 4. The device according to any one of claims 1 to 3, characterized in that a tray for collecting heavy waste is placed in the working chamber.