SU1205993A1 - Arrangement for knocking out mould - Google Patents

Description

2. The device according to claim 1, which is made up of the fact that the sealing element is made in the form of a protrusion with a height of 0.05-0.10 of the height of the flask corresponding to the contour of the flask .;

The invention relates to foundry and can be used for knocking out casting molds made from sand molding compounds.

The purpose of the invention is to increase the efficiency of shape destruction, increase reliability in operation and reduce maintenance costs.

FIG. 1 shows a knocking device with a mold placed therein before destruction, a longitudinal section; in fig; 2 — node I in FIG. one.

In the sealed detachable chamber 1 (Fig. 1), an additional open bottom box 2 is movably secured, before being knocked out, hermetically interlocking along the contour with form 3. As an example, the hinged mechanism for moving and pressing the box is represented, which is a hinge fixed by one end on the upper wall of chamber 1 and the other on the additional box 2. Between the upper wall of chamber D and box 2 of tension, spring 5i is stretched. The box 2 is provided with a roller stop fixed to it fixedly on it 6. The space of the receiving table 7 between the mold 3 and the bottom 8 is connected with the space of the chamber 1 by means of nozzles 9.

The side of the additional box 2 (. 2), facing the form 3, is provided with sealing elements; the junction plane of the box with the flask fixture bears the elastic material 10 (e.g., vacuum rubber), and along the perimeter of the inner side the box 2 is provided with an angular protrusion 1J with a certain gap repeating the shape of the flask.

The device works as follows.

3. The device according to claim 1

characterized in that the nozzles are installed at an angle of 35 to 90 in the horizontal plane.

During the period of removal of the stamped out flasks and placement in the device of the new mold 3, the movable part of the chamber 1 (Fig. 1) is shifted to the extreme left position,

the spring 5, having turned the levers 4, holds the duct 2 in the upper position, and the stop 6 protrudes by a certain amount beyond the movable part of the chamber 1. After being mounted on the receiving table 7 of the knock-out form 3, the chamber 1 is closed and the movable part of the latter moves to the right and closes with a fixed wall. Reaching the immovable wall of chamber 1, the stop 6 pours horizontal movement of box 2 in a position corresponding to the position of form 3, and further movement of the movable part of chamber 1

0 leads to stretching the spring 5, turning the levers 4 in the pivot bearings and lowering the duct 2 onto the shape 3. Ensuring a sufficient tightness: the accuracy of the joint between the duct 2 and

5: Form 3 with indispensable performance

The conditions for the tightness of the joint and the fixed parts of the chamber 1 are achieved by the fact that the presence of the protrusion 11 (Fig. 2), cutting in

0 when lowering the box 2 into the molding mixture, allows for a change in the amount; Vertical displacement; box 2 sufficient to compensate for the camera movement errors

5 1 and hinged mechanism. With a sharp decompression of the volume of the chamber 1, the air outlet from the box 2 is very long, therefore there is a certain pressure in it

40, the molding sand tends to move downward, and the decrease in pressure in the volume of the receiving table 7 under the mold 3, which communicates freely with the rest of the chamber space, contributes to this movement of the mixture.

Thus, due to the installation inside the chamber of an additional open bottom plastic box, movably fixed inside the chamber and equipped with a vertical movement mechanism and pressed against the knockout form with sealing of the junction between the box and the form, a downward flow (to the flip bottom) is directed downward , which increases the operational reliability of the knockout device, simplifies its maintenance (there is no need to clean the camera and other elements of the device) and effect fracture form.

This effect from the use of an additional box appears, as experiments show, when the height h of the box is 0.10-0.15 of the height of the selected form. At 10, the volume of air enclosed in the duct is not enough to give the mix outward movement downwards, since when the pressure in the chamber depresses, there is a drop in pressure and in the volume bounded by the duct and shape control, due to filtration through the mixture. The time of pressure drop is short, and the mixture, due to its inertia, does not have time to move. At, 15

This mixture surely shifts downwards, however, a considerable amount of air is added to the chamber, which forces the receiver to increase its volume and increases the energy consumption for air evacuation.

Communication of the receiving table space with the camera space can result in emissions

10 mixture into the chamber, and to clogging of the ventilation holes. The prevention of emissions of the mixture into the chamber is achieved by the fact that these volumes are communicated by nozzles directed towards the direction of movement of the mixture at an acute angle and raised to a certain height: the hydraulic resistance of such nozzles is rather small.

20 so as not to interfere with the flow of air, but large enough to stop the movement of the embossed mixture. In order to avoid obstruction of the ventilation pipes, the angle Ы of their inclination to the horizontal plane should not be less than the angle of repose of the embossed mixture. The angle of repose of dry sand is about 35 °, and in order to ensure the reliability of the operation of the ventilation pipes it is necessary to position them vertically, therefore the angle d should be within 35-90 °.

F1 / g.2

Compiled by V. Sazonov Editor N. Bobkova Tehred Z. Kastelevich - Proofreader M.

Order 8600/11 Circulation: Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Filial mm Patent, g, Uzhgorod, st. Project, 4

Maksimishinets

Claims (3)

1. DEVICE FOR PUNCHING CASTING FORMS, containing a detachable chamber connected by means of a quick-acting valve to a vacuum source, a cantilever-mounted frame receiving table with an articulated bottom and a depressurization mechanism, which is characterized by the fact that, in order to increase the efficiency of mold breaking, increase reliability in operation and reduction of operating costs, it is equipped with an open five-walled box installed at the bottom, installed inside the chamber with the possibility of vertical movement of the sealing elements and placed on the bottom surface of the box, and pipes connecting the chamber space with a cavity "limited to the receiving table and the bottom. ·. 2. The device pop. 1, characterized in that the sealing element is made in the form of a protrusion with a height of 0.05-0.10 height of the flask, corresponding to the contour of the flask < 3. The device according to claim 1, characterized in that the nozzles are installed at an angle of 35 - 90 ° in the horizontal plane.