SU829317A1 - Pulse head - Google Patents

Description

one

The invention relates to foundry production, in particular, to devices for making and knocking out shapes with a pulse of compressed air.

A pulsed valve for molding machines is known, comprising a housing with a working cavity, a closed lid through which compressed air is supplied, and inside the body a hollow valve is provided in the channel, equipped with single-acting cuffs 1.

However, the discharge of compressed air from the over-piston cavity does not occur instantaneously, which leads to a decrease in the efficiency of the pulse.

A known impulse head comprising a housing with a working cavity in the lower part of which a divider is fixedly fixed, above which a valve is installed inside the housing made in the form of a piston actuator of the plate vertically moved by means of a piston actuator of the plate with seals fixed in its slots. holes in the divider. The working cavity of the housing is filled with compressed air to a certain pressure. With a pulse in stock

The cavity of the piston actuator is supplied with working fluid (liquid or compressed air), and the valve moves to the extreme upper position, opening to compressed air access to the openings of the splitter i and the molding sand. 11 After the impulse, the valve returns to its initial position under the action of the spring, and the impulse head is ready for

0 to the next cycle. One of the advantages of this design is the possibility of increasing the dimensions of the pulse head and ensuring the best possible compaction of the mixture in large flasks 2,

five

The disadvantages of this design are as follows: the opening speed of the holes is low, so the pressure in the piston actuator cannot immediately increase, which leads to a relatively smooth release of the compressed. the air in the working cavity, the resulting shock wave is weakened, its sealing effect is reduced5; the skew of the movable plate during the upward movement of the rod, which causes the openings to open non-simultaneously, which leads to an uneven distribution of the shock

0

. Bolns, respectively, to the compaction of the mixture that is uneven in the plane of the form; significant energy costs when moving the movable plate to open the holes, since it is necessary to overcome the high pressure of compressed air in the working cavity.

The purpose of the invention is to increase the speed of the pulse head.

The goal is achieved by the fact that the valve is placed under the divider and is connected to the drive rod by means of a slider rod fixed to it with the possibility of free longitudinal movement, pivotally connected to two oppositely mounted levers that interact with the upper pole of the valve with the stops, while the lower lever has the second end of the hinge attached to the housing and the upper pivotally connected to the valve. .

FIG. 1 shows schematically a pulse head with the openings of the dissector closed, a general view, a section; FIG. 2 is a view A of FIG. 1 position of the working element of the drive of the slide and the levers with the extreme upper position of the movable plate (valve); in fig. 3 shows the position of the drive rod of the slide and the levers at the initial moment of movement of the movable perforated plate downwards; in fig. 4 the same, with the lowest position of the movable perforated plate.

The pulse head for compacting the casting molds comprises a housing 1 with a working cavity 2, in the lower part of which a divider 3 is fixed, which is a plate with holes 4, under which there is a valve 5 with holes 6 formed as a movable perforated plate and 7, interconnected with the drive rod 8 of the piston drive 9 by means of a slide mounted on the rod 8 with the possibility of free longitudinal movement between the stops 10 and 11 of the slide J.2. The slider 12 is pivotally connected with two oppositely mounted levers 13 and 14, which abut against the upper position of the valve 5 against the stops 15 and 16, while the lower lever 1-3 with the second condom is pivotally fixed to the housing 1, and the upper lever 14 is pivotally connected to the valve 5. .

Powered pulse head as follows.

Compressed air fills the working cavity 2 (Fig, 1), sealed with valve 5, which is in its extreme upper position. To effect a pulse, the piston actuator, 9 (Fig. 2) moves the rod

8 left. In this case, the anvil 10 located thereon approaches the slider 12 and moves it, withdrawing the levers from the neutral position, 13 and 14 (Fig. 3). Under the action of compressed air in the working cavity 2 (Fig. 1), the valve 5 sharply moves downward as a result of the fact that the slider 12 (Fig. 4) can freely move along the rod 8 up to the stop 11. Compressed air passes through the holes 4 Dfig, 1) and 6 to mold sand and compacts it. To seal the working cavity 2, the rod 8 of the piston actuator 9 moves to the right (Fig. 2), the stop 11 moves the slider 12 by the neutral axis at a small angle, the levers 13 and 14 abut against the stops 15 and 16. At the same time, the movable plate 5 (Fig. 1 ) rises to the upper position and seals the working cavity 2 by means of seals 7, and the pulse head is ready for the next cycle.

Claims (2)

In the proposed pulse head, all the holes are sharply and simultaneously opened as a result of the fact that the movable plate is installed under the divider and has a special drive design. In addition, much less energy is expended on opening the holes, since a small amount of energy is required to move the movable plate downward to move the levers from the neutral position. The sharp opening of the holes improves the efficiency of the compressed air, and the location of the movable plate under the divider reduces the drive's energy consumption. A pulse head for the manufacture of casting molds, comprising a housing with a working cavity, in the lower part of which a splitter is fixed and a valve made in the form of a movable perforated plate, interconnected with a driving rod, characterized in that, in order to increase speed, the valve is placed under the divider and connected to the specified drive rod by means of a freely mounted longitudinal movement between the stops of the slide of the slide pivotally connected to two oppositely mounted ones by levers interacting with the upper position of the valve with stops, while the lower lever with the second end is pivotally attached to the body, and the upper one is pivotally connected to the valve Sources of information taken into account in the examination 1, USSR Author's Certificate No. 299180, cl. F 16 K 31/363, 1966. , 2. USSR author's certificate 606677, cl. B 22 C 15/22, 1977. 5 3 5/4 fl n W s (, I / I I IP- N. 16