SU699034A1 - Unit for chemical treatment of tubes - Google Patents

Description

one

The invention relates to the chemical treatment of the surface of metal products and may find application in mechanical engineering, in particular, in multi-process cleaning of internal and external surfaces of tubes, for example refrigerators.

A device for the chemical treatment of tubes is known, which uses compressed air to move the working fluids, sots-holding containers for process fluids, a working chamber for the tubes and drain tanks for liquids. The working tanks are connected to drain tanks through the cavity of the working chamber by means of a piping system with switching cranes embedded in them, controlled by a program mechanism. At the same time, the working chamber is installed obliquely and has intermediate plums along the length, which are connected to a drain tank, which is in pressure and is connected by means of pipelines and switching valves with

DRAIN containers for process liquids Cl.

However, this device is complicated in construction due to the need to install a large number of connecting pipelines and control valves and occupies a large production area.

Also known is a unit for the combined cleaning of internal vacuum surfaces of metal pipes containing process fluids with working tanks connected to the baths by taps and connected via pipelines to the product receiver, a device for returning the process fluid from the receiver to the baths and a compressed air supply device working capacity 2.

This unit is closest to the proposed installation to the technical essence and the achieved result ..

However, the unit is controlled manually, as a result of which the unit

has a small technological. opportunities . The unit does not allow processing in more than three working environments, since the design of the device for returning the process liquid from the product receiver to the baths does not ensure separate removal of a large number of working media without mixing them.

The aim of the invention is to automate the process and improve working conditions.

This is achieved by the fact that the installation is equipped with a multi-position crane and software control installed in the pipelines, the valves of the working tanks are designed as non-return valves located at the base of the tanks, and the receiver for products is connected to the baths by means of a pipe lowered last to the level of the check valve.

FIG. 1 shows the installation, the general scheme; in fig. 2 shows section A-A in FIG. one,

The device for processing tubes contains a working chamber 1 for the tubes being processed, drain tanks 2 for process liquids, a program switch 3 and a system of pipelines connecting tanks 2 to chamber 1 via a program switch, as well as a faucet 4 air from the system.

The working chamber 1 is made in the form of a cavity with the dimensions of the products being processed, delighted by a cylindrical body 5 with a bottom 6 and a lid 7. The latter is equipped with a clamping mechanism consisting of a pneumatic cylinder 8 fixed on the board 9, the piston 10 of which is connected by means of a rod 11c on the lid 7 through the plate 13. The bracket 12 with the plate 13 and the lid 7 is pivoted on the rod 11.5

In the chamber .1 there are two connections: the inlet 14 in the upper part and the outlet 15 located in the lower part of the receiver.

In each drain tank 2, filled with an appropriate working fluid, a tank 16 for the process fluid is mounted, mounted on supports 17 at the bottom of the tank. The container 16 is formed by a hermetic case 18, in the lower part of which there is a check valve 19 with a free-lying plate 2O. To the top

a part of the tank 16 is mounted a compressed air supply pipe 21 and a pipe 22 for liquid collection to be processed, for which the end of the latter is lowered to the bottom of the tank 16.

Each drain tank is located extended end of the pipeline 23 to return the liquid from processing. The end of this pipeline is lowered to the level of the non-return valve 19 of the tank 16, as a result of which, when there is liquid in the bath, at the end of this pipeline there is a hydrostatic pressure equal to the height of the liquid column at the level of the non-return valve. The expanded end of the pipe 23 also has a wedge notch 24. Each tank 2 has a drain pipe 25, a flange 26 for installing the cover, in addition, auxiliary pipes and pipelines can be installed in it, for example, steam to heat the liquid, drain the liquid, etc. P.

The program switch 3 is a dual multi-position valve consisting of a body with two spools insulated from each other, mounted on a common shaft 27. One of these spools distributes fluids from the tank 16, which are supplied to the corresponding fittings (A , B, V...) Of the crane, to one common outlet connection leading to the chamber 1. The other spool distributes the fluids coming to the rim from the other chamber fitting, back to the tanks 2 (fittings A, B, C, etc. .) -. The crane is driven by a double acting pneumatic cylinder 28, with which it is connected by a lever 29 sitting on the shaft of the crane 27, on the one hand, and attached to the piston rod of the pneumatic cylinder, on the other hand.

Under the lever 29, there is a ratchet mechanism consisting of a ratchet wheel 31 seated on the shaft 27 and a pawl 32 with a spring 33 fixed on the lower side of the lever 29.

Claims (2)

The pneumatic cylinder 28 is connected to the switch 34 by means of pipelines connected on both sides of the piston. This switch is a pneumatically controlled two-way air distributor. The switch 34 is connected to compressed air through a four-way valve 35 and a pneumatic relay 36, which provides periodic air supply depending on its setting. In general, these elements form a software mechanism that is triggered at specified intervals. In the proposed installation, the compressed air is supplied to the tank 16 (more precisely, the pipelines 21 of the working tanks 16 are made through the valve 35 and the reducer 37, and the air is supplied to the pneumatic cylinder 8 to move it to the right position through the valve 35. The air supply to the pneumatic cylinder 8 is the movement to the left is done through valve 4 connected to valve 35 through reducer 37, i.e., to the air supply line in the tank 16. The installation works as follows. The tube bundle is installed in the chamber with the lid 7 open and retracted to the side, after which cover The valve 35 is opened, the air enters the left cavity of the pneumatic cylinder 8 through the valve and tightly closes the lid 7. At the same time, the compressed air through the valve 35 and the gear 37 enters all the tanks 16 and exerts pressure on the fluid in them. Under the action of this pressure, the check valves 19 are closed. Compressed air from the valve 35 also enters the pneumorel 36 and then through the switch 34 to the right-hand side. pnevmotsnlinra 28. The latter by means of the lever 29 and the ratchet mechanism rotates the shaft 27 of the crane to the first position, for example A, for processing tubes with alkali. In this position, the alkali from the tank 16 tank for alkali through one of the valve spools (for the remaining baths it remains closed) under the action of compressed air is forced into the chamber 1 through its upper fitting, the cell flows through the chamber and flows out of its lower section to the second section of the valve (its general joint), after passing through it, it is discharged into alkali tank 2. The leakage through the chamber, the alkali, by itself, makes the surface treatment of the tubes. Alkali flows from the tank 16 into the alkali tank 2 through the chamber 1 until the alkali is completely expelled from the tank. After this, the tubes are purged in the receiver, i.e., instead of alkali, air is circulated in the system, displacing the previously alkaline material. This air escapes through the tube 23 in bath 2, and the cut-out 24 prevents liquid splashes. Since the ends of the tubes 23 are lowered to the level of check valves, valves 19, the pressure in the system after the gearbox 3 7 does not fall. It is below the height of the liquid column above these valves and, therefore, during purging, the working tank cannot be filled with alkali from the tank through valve 19, which would otherwise cause a pulsating flow of alkali. The duration of the purge is determined by the response time of the pneumorele 36, which, when triggered, supplies air to the left side of the pneumatic cylinder 28 to return its rod to its initial position, then again to the right side. When this pneumatic cylinder 28 makes a double stroke and through the ratchet mechanism turns the valve 3 to a new position (B). In the new application of the crane 3, the channels for supplying alkali (or air) from the corresponding tank, also from chamber 1 to tank 2, are blocked. At the same time, the channels for the supply of another liquid, such as hot water, are opened. As a result, in the same manner as already described, chamber 1 is supplied from the appropriate tank 16 with hot water for flushing the tubes, which is immediately drained into the corresponding tank 2. The flushing with hot water, like the previous operations, is completed by blowing air. The timing of the supply of hot water and the subsequent purging is also determined by the response time of the pneumatic control valve 36, which contributes to turning the valve 3 to a new position for supplying another liquid. The process described is repeated as many times as many liquids are provided to process the tubes, with automatic transition from one fluid to another. The process is interrupted manually when the valve 3 takes the last position (for example, by a special signal), and is performed by the valve 3, which moves to the air supply position in the right cavity of the pneumatic cylinder 8, as a result of which the cover 7 opens. At the same time, the valve 4 is turned and provides air release from the entire system located behind the gearbox 37, including from the tanks 16. When the cover 7 is open, the treated tubes are removed from the chamber 1 and the new tubes are loaded. Simultaneously with the air bleed off and the containers 16 are filled with liquids from the respective tanks 2 through a check valve 19, the plate 20 of which is soldered under the action of the pressure of the liquid. After this, the installation is again ready for operation. The duration of a single-fluid treatment cycle is set by the running time of the program mechanism, and part of the direct fluid treatment cycle is defined by the capacitance values 16. The proposed device is much simpler in operation than the known tube processing devices, occupies a smaller production area and improves the working conditions of workers. Claims of Invention Plant for chemical processing of tubes, containing baths for technological liquids with working capacities of 4 tons, connected to baths by means of taps and connected by pipelines to a receiver for products, a device for returning technological liquid from a receiver to baths and a device for feeding compressed air into working tanks, characterized in that, in order to automate the process and improve working conditions, the installation is equipped with a multi-position program-controlled crane, installed The pipes in the working tanks are made in the form of return claws placed at the base of the working tanks, and the receiver for products is connected to the baths by means of a pipe lowered last to the level of a check valve. Sources of information taken into account in the examination 1. USSR author's certificate number 4O1756, cl. C 23 G 3/04, 1970. 2. Krutous E. B., Nekrich M. I. Technique of washing products in mechanical engineering. Mechanical Engineering, 1969, p. 154, fig. J8, f7 w Figs, g Compiled by A. Koryubkov Tehred L. Alferova Editor M. Rogova Order 7453/27 Circulation IZSubsigned ShchaIPI USSR State Committee for inventions and discoveries 1.13035, Moscow, 4/5, Raushska nab. Branch PPP Patent, Uzhgorod, st. Design, 4 Corrector. Sharoshi