SU757245A1 - Nozzle for sand blasting machine - Google Patents

Description

The invention relates to foundry, in particular to sandblasting machines.

Known nozzle for sandblasting machine, comprising a housing with a valve placed in it, made in the form of an elastic tube, between the outer surface of which and the housing there is a cavity communicated with a source of compressed air, and mounted on the outlet end of the elastic nozzle tube, having a manifold with channels [1 ].

The disadvantage of this nozzle is that the nozzles can be cleaned only when the additional valve is open.

The purpose of the invention is to reduce spillage when removing the mixture from the nozzle with the valve open and closed.

This is achieved by the fact that the reservoir cavity is in communication with the nozzle cavity.

FIG. 1 shows a nozzle with a closed valve, a slit; in fig. 2 - nozzle with an open valve, a slit.

The nozzle for the sandblasting machine (see FIG. 1 and FIG. 2) includes a detachable body 1 and an elastic tube 2 disposed therein with a channel 3 for feeding the mixture. Between ext.

Here, the surface of the elastic tube and the body houses a cavity 4 for controlling the clamping of the elastic tube. At the point where the mixture leaves the elastic tube, nozzles 5 are installed, equipped with a collector _{5 of} rom 6, from which cleaning channels 7 are led, which supply compressed air to clean the channel 3 of the elastic tube and the nozzle from the mixture. The upper part of the nozzle has a ring 8, the lower one is equipped with a sealing ring 9. In the bore duct of the nozzle, there is a seat 10, which interacts with the piston 11. The saddle and piston constitute a normally closed valve. The cleaning channels are removed from the collector 6 into the nozzle passage through the nozzle above the saddle and are directed into an annular section 12 formed

¹⁵ piston when lifting above the saddle. On the rod 13 of the piston fixed curly washer 14, provided with a seal 15 and having a channel 16 for the passage of the mixture. Between the supporting end 17 of the nozzle and the supporting end

2 18 curly washers installed compressed

spring 19. Spring 19 orients the piston 11 on the seat 10, promotes the return

piston to its original position and creates

additional force of pressing the piston to

757245

the saddle. Between the lower end of the sealing ring 9 and the upper end of the figured washer 14 there is a gap selected as the piston rises above the saddle.

Before inflating the air pressure in the cavity of the middle part 4 pinches _elas-} cal tube 2 and holds the compressed air and the mixture in tank peskoduvnoy machine.

The nozzle works as follows.

To perform the inflation, the form (not shown in the drawing) is pressed against the seal 15 (see Fig. 1 and 2). When this figure washer 14 is pressed against the sealing ring 9, the piston 11 rises above the saddle 10, opening the annular section 12 for the passage of the mixture. By relieving pressure from the cavity 4 opens passage ^13: the channel 3 of the elastic tube, and the mixture from the tank peskoduvnoy machine (not shown) is supplied under pressure via the compressed air channel 3 the elastic tube 2, the annular section 12 between the pis- 2 ₀ 11 therein and the saddle 10, the channel shaped washers 14 and the hole of the seal 15 into the form. After completing the form the residue mixture contained between the plane of the shape and location pinch the elastic tube, air is blown an excess pressure The feed ²¹ by direct purification through channels 7 peskoduvnoy back into the machine tank for reuse. At the end of the cleaning process, the elastic tube 2 is clamped. Then the form is lowered, and the piston 11 under the action of the weight of the moving parts and the force of the spring 19 returns to its original position, closing the annular section 12, thus eliminating the possibility of blowing the mixture out of the intended device during an emergency pressure release for control by clamping an elastic tube. In addition, normally closed valve

at

keeps the mixture in the nozzle through the channel at the end of work after depressurising the sandblast tank and the cavity to control the compression of the elastic tube, as well as in the nozzles that do not participate in the work when performing inflation according to several programs. The mixture held by the valve is returned by the cleaning pressure to the sandblast tank. The mixture that entered the nozzle through an open elastic tube at the end of work is blown out at the beginning of the next working day. Preparation of the nozzle to work is as follows. By pressing the mold to the nozzle and filling the sand-blowing tank with air, cleaning pressure is supplied to the manifold, which blows the mixture from the nozzle into the sand-blowing tank, then the elastic tube is pressed into the pressure applied to the cavity to control the clamp. In the future, the operation of the device continues in the usual automatic mode.

When applying the cladding to the molds according to different programs, cleaning of all nozzles, both participating in the process of applying the cladding and not participating, is performed simultaneously, since the proposed device allows you to remove the mixture from the nozzle both with the valve open and closed.

Claims (1)

Claim Nozzle for sandblasting machine according to ed. swith No. 617157, characterized in that, in order to reduce spillage when removing the remainder of the mixture from the nozzle, the collector cavity communicates with the nozzle cavity.