SU755427A1 - Pulse head for knocking-out casting moulds - Google Patents

Description

The invention relates to the field of foundry, in particular to equipment for knocking out molds.

A pulse head for knocking out molds is known, comprising a housing with a valve and a divider located in it, made in the form of movable and stationary perforated plates forming a divider cavity with the housing; head is provided with a stationary apertured plates mounted on the perimeter of the spring-loaded floors ¹ ® E needles with an opening communicating the cavity with a cavity divider needles and needle cavity with atmosphere (1].

The disadvantage of this head is the fact that the shake-out and dry forms of dried neudo- vletvoritelna ^15, and spring-loaded hollow needles are inefficient means to achieve a better result.

Also known is a pulse head for knocking out molds, comprising a housing with a valve and a working cavity, in the lower part of which a fixed perforated plate 12 is fixed.

¹ 2

The disadvantage of this, the head is the incomplete removal of the molding sand from the flasks and castings. So when knocking out complete forms and if there are crosses in the flasks, it is impossible to completely remove the molding mixture from them. The moldable mixture lingers on the surface of the casting in the form of a slide, and the larger the horizontal surface of the casting, the larger the slide of the molding mixture lingers on it.

In the production of the pulse head of the repeated pulse, the slide practically does not change its shape, since in this case the compressed air stream removes from the flask only the mixture that has no obstacles in its way, and, therefore, the compressed air stream only flows around the casting along the external circuit. The moldable mixture is delayed on the cross-pieces and in their corners.

The purpose of the invention is to increase the efficiency of removing the moldable mixture from the flasks and castings.

The goal is achieved by the fact that the pulse head is equipped with blow-off valves, the nozzles of which are installed in the lower part of the side walls of the stationary perforated plate at an angle of 30-60 ° to the horizontal, and the supravalve valve cavities are in communication with the working cavity of the head through the throttles. $

The drawing shows the proposed pulse head, section.

The pulse head contains a housing 1 with a working cavity 2 and a valve 3 having a stem 4 and a movable perforated plate 5. A cover 6 is fixed in the upper part of the housing 1, against which the spring 7 interacts with the valve 3. The spherical rod 4 is made in the lower part of the stem head A; it is covered by a sleeve 8 with a spherical bore fixed on a movable perforated plate ₁₅ and pre-cut * for ease of assembly with a spherical head A. A spring 9 is mounted on the rod 4, resting on its shoulder B on one side and the other end ₂ ° C the sleeve 8. At the bottom of the housing 1 is fixed stationary perforated plate 10, holes 11 which are offset relative to the holes 12 of the movable plate 5 of the valve 3. In the upper part of the stationary tub ₂₅ a perforated plate 10 coaxially with its openings 11 are formed annular projection 13. At the bottom of the movable plate 5 of the valve 3 with the holes 11 in the stationary apertured plate 10 are sockets in which are arranged uplot- · zo niteln 14.

On the side walls of the stationary perforated plate 10 there are blown valves 15, nozzles 16 of which are installed at an angle o equal to 30-60 ° to the horizontal, ₃₅ while the above-valve cavities 17 of the blown valves 15 are connected through the pipelines 18 and throttles 19 to the pulse working cavity 2 heads. Each of the blowing valves 15 has a piston-valve 20 and a spring 21. In the lower part of the stationary perforated plate 10 against some of its holes 11 are fixed glasses 22 in which the pins-baking powder 23 and the spring 24 are installed.

The pulse head operates as follows.

From the discharge line 25 from an external source of high-pressure compressed air through the distributor 26 and the hole 27 in the housing 1, the compressed air enters the working cavity 2 and then through the openings 28 in the housing 1, the pipelines 18 and the throttles 19 it fills the supravalve cavities 17 of the blow-off valves; Panov 15. Under pressure of compressed air in nadklapannymi cavities 17, the piston valves 20 are moved and, overcoming the resistance of the springs 21, block the nozzle 16.

To produce a pulse, the distributor 26 blocks the access of compressed air to the working cavity 2, and opens the air through the channel 29 into the cavity 30, and the valve 3 moves to its highest position, allowing compressed air to rush through the openings 11 to the moldable mixture. At the same time, compressed air through the holes 11 acts on the baking powder pins 23, which, overcoming the resistance of the springs 24, fall on the mixture in the upper flask 31, loosen it, facilitating the destruction of the entire form. As a result of the impulse, the molding mixture is knocked out of the upper flask of the 31st lower flask 32, and the casting 33 With a slide of the molding mixture 34 is delayed on the crosspiece 35 of the lower flask 32.

After the pulse, the distributor 26 opens the exhaust line 36, into which compressed air rushes from the cavity 30, the 1st valve 3 returns to its original position by the action of a compression spring 7. In this case, the seals 14 are pressed against the annular projections 13, sealing the working cavity 2, the pressure in which is close to atmospheric. Therefore, the circulated air from the supravalve cavities 17 through the pipelines 18, the throttles 19 and the openings 28 in the housing 1 enters the working cavity 2, and the springs 21 of the blower valves 15, displacing the pistons ^{4 of the} valves 20 from the nozzles 16, open compressed air through the openings 37 of the blower valves 15 and their nozzles 16 rush onto the slide of the molding mixture 34 and completely remove it from the surface of the casting 33.

The throttles 19 installed on the pipelines 18 are provided so that the compressed air does not instantly come from the supravalve cavities, but with a certain time delay, so that the valve 3 drops to its lowest position before the end of this delay and covers the openings 11 of the fixed perforated plates 10. In this case, the particles of the molding mixture will not be allowed to fall into the working cavity 2 during operation of the blowing valves 15.

When 6 jets of compressed air are directed from the nozzles at an angle of 30-60 ° to the horizontal, the particles of the molding mixture come off the slide 34 of the mixture without encountering such an obstacle that could delay them. Inside the cavity of the flasks 31 and 32, a “storm” takes place, and the vortices of the latter carry out the molding mixture that lingers on the crosses of the flasks and at their corners.

Claims (1)

Claim Impulse head for embossing molds, comprising a housing with a valve and a working 5 755427 cavity, in the lower part of which a fixed perforated plate is fixed, which is connected with it. In order to increase the efficiency of removing the molding mixture from the flasks and castings, it is equipped with blow-off valves, the nozzles of which are installed in the lower part of the side the walls of a fixed perforated plate at an angle of 30-60 ° to the horizontal, and the supravalve cavities of the valves are connected to the working cavity of the head through throttles.