SU1673254A1 - Impulse head - Google Patents

Abstract

The invention relates to foundry, in particular, to molding equipment for the manufacture of casting molds of sandy-clay mixtures. The purpose of the invention is to reduce the consumption of compressed air for one cycle of operation and increase the service life. The impulse head contains 2 outer and inner 4 chambers rigidly fastened to each other and communicating with a slot 5 in the bottom of the inner chamber 4, blocked by a flat rigid valve 9, with an opening 6 in the center of the bottom of the inner chamber 4 for exiting compressed air from the impulse head . New in the pulse head are at least two electromagnet 7 placed in the bottom of the inner chamber 4 on both sides of the slot 5, while valve 9 has an opening A equal and coaxial to the opening 6 of the bottom of the inner chamber 4, and in the cover of the inner chamber 4 coaxially with the opening A of the valve 9, there is a pointed protrusion 8, extending to its base to the size of the opening A in the valve 9 and having a height equal to the height of the inner chamber 4, the valve 9 being made of a ferromagnetic material. The use of electromagnets that hold the ferromagnetic valve and, therefore, compressed air in the outer chamber, provide maximum speed, due to a sharp decrease in the holding electromagnetic force in the process of valve movement. 1 il.

Description

The invention relates to foundry, in particular to molding equipment for the manufacture of foundry molds when compressed with sand gas clay sand mixtures.

The purpose of the invention is the reduction of compressed air consumption per cycle.

The drawing shows a pulse head, cross section.

The pulse head contains a housing 1, forming an outer chamber 2 with a supply pipe 3, and an inner chamber 4, rigidly fastened to the housing 1 (for example, ribs B), in the bottom of which there is a slit hole 5 for the release of compressed gas from the chamber 2 and a central hole 6 for the release of compressed gas from the pulse head, electromagnets 7. located in the grooves made on both sides of the slot 5, in the lid of the inner chamber 4 there is a pointed protrusion 8, expanding to its base to the size of the coaxial hole A of the valve by 9 and having a height equal to the height of the inner chamber 4.

The drawing also shows the filling frame 10. the flask 11 with molding sand 12 and the model plate 13.

The pulse head operates as follows.

After assembling the system: a pulse head, a filling frame 10, a flask 11, a model plate 13 with a molding mixture 12, compressed air is supplied through a pipe 3 to the outer chamber 2, while the electromagnets 7 are turned on a little earlier, which attract the flat hard ferromagnetic valve 9 to the bottom of the inner chamber 4, thereby holding gas in the outer chamber 2. After reaching the required pressure of the compressed gas in the outer chamber 2, the supply of compressed gas is stopped, the electromagnets 7 are turned off and the valve 9 cuts under the action of the compressed gas it moves upward, and gas from the outer chamber 2 through the slit hole 5, as well as air from the supravalve space through the central hole A of the valve 9, is discharged through the hole 6 into the cavity of the filling frame 10, sealing the molding mixture 12 in the flask 11. The pointed protrusion 8 reduces the damping the volume in the inner chamber 4, which reduces the sharpness of the pulse, directs the gas flow into the central hole 6, and also provides braking of the valve 9 in the upper position by reducing the gap between the valve and the wall of the inner chamber and the surface of the pointed protrusion 8, through which the air above the valve space is displaced.

The central hole in the valve allows the pulse to increase its speed by reducing mass and windage, which increases the efficiency of use of energy of compressed air. The energy spent on overcoming the windage of the valve is added to the main impulse. as the air from the inner chamber (nadklapanny space) passes through the Central hole of the valve into the cavity of the filling frame. The protrusion reduces the damping volume of the inner chamber, which reduces the sharpness of the pulse, provides braking of the valve when approaching the extreme upper position, thereby weakening the blows on the lid of the inner chamber. The pointedness of the protrusion ensures uniform gas flow when it flows out of the pulse head.

Therefore, the energy efficiency of compressed air is increased, which reduces energy costs for the manufacture of molds and reduces dynamic loads.

Claims (1)

Claim An impulse head for compacting the molding mixture with a compressed air pulse, comprising a housing with an exhaust hole and a chamber housed in the housing to form a slit hole located around the saddle of the exhaust hole and closed by a flat valve, characterized in that, in order to reduce the flow of compressed air by one cycle work and increase the service life, it is equipped with at least two electromagnets located in the bottoms of the housing and chamber on both sides of the slot hole, and in the flat valve is made stie equal and coaxial with the exhaust port, wherein the upper part of the chamber is formed conical protrusion with a base equal to the size of the exhaust hole, and a height equal to the height of the camera, and the flat valve is made of a ferromagnetic material.