SU1733184A1 - Pulse head - Google Patents

Abstract

The invention relates to foundry and can be used in the manufacture of disposable casting molds. The purpose of the invention is to increase the reliability of operation and increase the service life. This goal is achieved by the fact that the seal is made in the form of a strip of constant cross section, the side walls of which are fixed at the ends of the annular groove, and the cavity formed is in communication with the cavity of the receiver. The use of the proposed device improves the reliability of the seal and reduces the consumption of compressed air due to the possibility of ensuring the tightness of the working cavity by eliminating the gaps between the seal and the valve resulting from wear, including local wear of the contact surfaces of these elements or skewing of the valve relative to the outlet. . 3 il.

Description

The invention relates to foundry and can be used in the manufacture of disposable casting molds.

The purpose of the invention is to increase the reliability of operation and increase the service life of the seal.

Figure 1 shows a pulse head, a general view; figure 2 - node I in figure 1, the seal, the initial position; fig.Z - the same, the working position.

The impulse head consists of a housing 1 with a working cavity 2, a dissector 3 with holes 4, an outlet 5, a valve 6, in the saddle 7 of which an annular groove 8 is made, at the ends of which there is a seal 9 BV in the form of a strip of constant cross section. The cavity of the annular groove 8 is connected to the working cavity 2 by channels 10. The overhead piston space 11, the piston space 12 of valve 6 and the working cavity 2 are connected respectively by pipes 13, 14 and 15 to a compressed air source (not shown).

Pulse head works as follows.

Compressed air is fed through the pipeline 13 to the above-piston space 11 of the valve 6, which moves to its lowest position and closes the outlet 5, thereby sealing the working cavity 2 from the atmosphere. At the same time, the seal 9 is deformed around the entire perimeter. Simultaneously, through the pipeline 15, compressed air is supplied to the working cavity 2, from which air flows through the channels 10 into the cavity of the annular groove 8. Under the pressure of the compressed air, the seal 9 is stretched and pressed to valve 6 , eliminating possible gaps between the sealant 9 and the valve 6, which arise due to local wear of the contact surfaces of these elements

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or in the case of a skew of the valve 6 relative to the outlet 5, which ensures the tightness of the working cavity 2 and eliminates the loss of compressed air. After that, the compressed air through the pipeline 14 is fed into the piston space 12, and from the over piston space 11, the compressed air is discharged into the atmosphere through the pipeline 13, the valve 6 begins to move to its extreme upper position. Compressed air from the working cavity 2 enters the cavity of the splitter 3 and then through the holes 4 into the space above the mixture (not shown), while the air pressure in the working cavity 2 and the cavity of the annular groove 8 of the compactor 9 drops (due to the removal of air from the cavity of the annular groove 8 through the channels 10 into the working cavity 2, then into the cavity of the splitter 3 and through the holes 4 into the space above the mixture), the seal 9 returns to its original position. After compacting the moldable mixture, the cycle is repeated.

The application of the proposed device allows to increase the reliability of seal operation and to reduce the consumption of compressed air due to the possibility of ensuring the tightness of the working cavity by eliminating gaps between

a sealant and a valve arising due to wear, including local wear of the contact surfaces of these elements or a skew of the valve relative to the outlet. In this case, the seal

can be exploited, fulfilling its functions, until complete wear - violation of its integrity.

Claims (1)

Claims An impulse head comprising a housing with a working cavity and an outlet, a valve in the seat of which there is an annular groove with a seal, characterized in that, in order to increase the reliability of operation and increase the service life, the seal the side walls of which are fixed at the ends of the annular groove, and the cavity formed communicates with the working cavity,  //// LULULU / LUGL ULAU / LYU L / 71 D “. 1 3Ч4  П 15 one D ". 3Ч4 5c 5 8 Shig.Z