SU1600911A1 - Pulsed head - Google Patents

Abstract

The invention relates to foundry, in particular, to equipment for the manufacture of molds from sandy-clay mixtures. The goal is to increase the use of compressed gas energy, increase the valve opening speed and simplify the design of the pulse head. The pulse head includes a housing 1 with a working cavity 2, a ferromagnetic valve 8, an electromagnet with a coil 10 and damping elements 11. A new one in the pulse head is that its body 1 is made of a ferromagnetic material and provided with a protrusion 6 located along the perimeter of its inner surface as well as the central core 4, the lower part of which is made in the form of a flange 5, forming together with the protrusion 6 and the valve 8 with the electromagnet coil 10 turned on, the working cavity 2 and the subvalvate space 12, in which The valve 8 made with a central hole 9, the coil 10 of the electromagnet is located inside the working chamber 2. A proposed structure of the head pulse allows more efficient use of the pressurized gas energy by reducing the flow resistance of its expiration. 1 il.

Description

 The invention relates to a foundry, in particular, to equipment for the manufacture of molds from sandy-clay mixtures.

The purpose of the invention is to increase the use of energy of compressed gas, increase the speed of valve opening and simplify the design of the pulse head.

The drawing shows a pulse tip, cross section.

The pulse head contains a ferromagnetic body 1 with a working cavity 2 connected to a source of compressed gas through a pipe 3, the body 1 is provided with a central core 4. whose lower part is made in the form of a flange 5 and the bottom: whose surface M is in: one plane with the bottom the surface N of the protrusion 6 formed along the perimeter of the inner surface of the housing 1. The opening 7 between the flange 5 and the projection 6 is closed by a ferromagnetic valve 8 with a central hole 9, whose area is greater than or equal to the area of the opening 7. In addition, the pulse head has i ° coil 10 of the electromagnet, located in the working cavity 2, damping elements 11, located in the valve valve space 12, filling frame 13, mold 14 with molding sand 15 and model plate 16. The area of the central orifice 9 of the valve 8 is greater than or equal to the orifice of the orifice 7 in order to reduce the hydraulic resistance and to ensure uniform flow when the compressed gas flows out of the working reservoir 2.

Pulse head works as follows.

In the initial position, the coil 10 of the electromagnet is connected to a source of direct current power, the valve 8 is attracted to the flange 5 and the protrusion 6, blocking the opening 7, the gas pressure in the working cavity 2 is absent. After the system is connected (the pulse head, the filling frame 13, the flask 14 with the molding mixture 15 and the model plate 16), the compressed gas is supplied through the pipeline 3 into the working cavity 2. After the required gas pressure in the working cavity 2 is reached, it is disconnected from the source of compressed gas The coil 10 of the electromagnet is disconnected from the DC power supply. The electromagnetic holding force, which is directly proportional to the square of the current in the coil 10 of the electromagnet and inversely proportional to the square of the gap between the valve 8, the flange 5 and the protrusion 6, and the valve

five

ten

15 2

8 is detached from the flange 5 and the protrusion bis is accelerated downwards. As a result, the compressed gas from the working cavity 2 through the opening 7 and the central opening

9 in the valve 8, with a uniform shock wave rushes into the subvalvular space 12 and produces a pulse seal of the moldable mixture 15 in the forming container bounded by the filling

frame 13, flask 14 and model plate

1 R

After the valve 8 is disconnected, the coil 10 of the electromagnet is again connected to the DC power source. At this time, the valve 8 moves to the damping elements 11, where its speed is smoothly quenched, and the kinetic energy of the valve B is transferred to the potential energy stored in the damping elements 11, and then with this energy the valve is thrown upwards, where it falls into the magnetic field. the field of the electromagnet and is tightly attracted to the surface M of the flange 5 and the surface N of the protrusion 6, which are the opposite poles of the electromagnet.

Thus, the pulse head is reset. The proposed design of the pulse head allows to increase the efficiency of using the energy of compressed gas, since the opening between the flanges of the housing and the core and the central opening in the valve have a large area and, consequently, low flow resistance. The proposed design of a 5-pulse head has increased reliability in operation due to the simplicity of its design.

Claims (1)

Claims of the invention A pulse head containing a housing with a working cavity, a valve made of ferromagnetic material, an electromagnet and damping elements, so that, in order to increase the use of compressed gas energy, increase the speed of opening the valve and simplify the design of the pulse heads, the body is made of ferromagnetic material with a protrusion located along the perimeter of its inner side surface, and 50 with a central core, the lower part of which is made in the form of a flange forming stupid and valve working cavity, while the valve is a plate with a central hole, the cross-sectional area of which is equal to the cross-sectional area of the outlet, while the electromagnet coil is located inside the working cavity of the body, and the valve under the flange of the core and the protrusion,