SU1696102A1 - Impulse head - Google Patents

Abstract

The invention relates to foundry, in particular, to devices for compacting and knocking out wet sandy clay forms with a compressed air pulse. The purpose of the invention is to reduce energy consumption for compaction and increase reliability. The pulse head is provided with cylindrical rods of the same diameter and with cylindrical seals of the same diameter, and plates, where they are installed with constant pitch, have openings. Moreover, the seals and rods are mutually shifted by half a step. The depressurization of the pulse head is carried out by two mutually opposite movements of the sealing elements. 1 hp f-ly, 2 ill.

Description

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

A known impulse head comprising a housing with a working cavity, a divider, a valve made in the form of a movable perforated plate, a driving rod and a slider with levers.

The disadvantage of this pulse head - when opening the valve, it can be tilted due to the fact that it is connected to the drive rod only through one swivel. In this case, not all of the valve openings are opened, which leads to an increase in the pressure build-up time of the compressed air above the surface of the molding sand and the valve's seizure.

The closest in technical essence and the achieved effect is a pulse head, comprising a housing with a working cavity, a movable and fixed perforated plates.

A disadvantage of the known pulse head is the low speed of the valve being fully opened due to the absence of accelerating components in its known construction. During the depressurization of the pulse head, there are no mutually opposite movements of the actuators, therefore, the depressurization rate of the head decreases.

In addition, the compaction of perforated plates reduces the work; the design ability, as seals work on the cut.

The purpose of the invention is to reduce energy consumption for compaction and increase reliability. The goal is achieved by increasing the pressure build-up rate of the compressed air pulse above the surface of the molding mixture, which is provided by pre-accelerating the actuator stem and due to the subsequent depressurization of the pulse head by mutually opposite movements of the sealing elements.

The proposed pulse head is simpler in comparison with the known one in construction due to the use of reinforced elastic cylindrical seals.

The combination of the features of opening the pulse head with two mutually opposite movements of the rods and seals makes it possible to reduce the energy consumption for compaction. Replacing the rubbing sealing elements of the structure with running elements increases its reliability.

Figure 1 shows a pulse head, a general view; Fig. 2 is a graph of the opening of the pulse head.

The pulse head includes a housing 1 having openings for supplying compressed air to its tank, made in the form of a cap, onto which a frame 2 is tightly attached to the bottom, in which reinforced elastic cylindrical seals 3 are placed with a constant pitch of one diameter for rotation and vertical movement ,

 spring-loaded (springs not shown) to the periphery of cylindrical rods of the same diameter placed with the same constant pitch in the movable plate 4, made in the form of a frame, tightly connected through the plate 5 to the frame 2 with the ability to reciprocate and interact with the drive 6. The seals 3 are offset by 1/2 of the step relative to the cylindrical rods of the movable plate 4.

Pulse head works as follows.

Compressed air is supplied to the container of the housing 1, sealed with reinforced elastic cylindrical seals 3, with an initial force of springs directed between the periphery of the cylindrical rods of the movable plate 4 to the required working pressure. This prepares the impulse cycle. For its implementation, by means of the accelerating actuator 6, the moving plate 4 is transmitted to the movable plate 4. The magnitude of the longitudinal movement of the movable plate 4 is directly dependent on

 the diameter of its axes, their pitch and is chosen depending on the conditions of formation of the most; larger passage. When the longitudinal movement of the movable plate 4 of its axis, interacting its periphery with

the periphery of the reinforced elastic cylindrical seals 3, move them from the movable perforated plate. When this happens, the depressurization of the container body 1 occurs and the compressed air from this tank flows into the technological equipment tank (not shown), with a pulse that dynamically affects the molding sand.

The actuator 6 returns the movable plate 4 to the initial position, the seals 3 seal the capacitance of the housing 1 at the same time. After the impulse, the cycle of preparation of the impulse head repeats and it is ready for

next pulse, which is carried out according to the scheme described above. The graph of the opening of the pulse head (Fig. 2) graphically shows the shortening of its opening time. Curve 1 reflects the speed

uniformly accelerated movement of the actuator 6 for opening. Curve 2 reflects the direction and speed of movement of the reinforced elastic cylindrical seals and shows the time shorter.

full opening due to the mutually opposite movements of the sealing elements of the proposed design.

The HOt coordinate system corresponds to the beginning of the movement to open the drive

6, the HiOiti coordinate system reflects movements over time until the complete depressurization of the design of the sealing elements of the pulse head.

The coordinate axes of both coordinate systems reflect the movement of the executive elements of the pulse head design. The x-axis - time.

Claims (2)

1. An impulse head for the manufacture and knocking out of casting molds, comprising a housing, a valve consisting of a moving and fixed plate, a movement drive Moving plate, characterized in that, in order to reduce energy consumption for sealing and increase reliability, it is equipped with cylindrical rods of the same diameter and cylindrical seals with a diameter equal to the diameter of the rods, with openings in the plates seals are installed in the fixed plate and rods in the mobile plate, and they mutually offset 1/2 step. 2. An impulse head according to claim 1, in accordance with claim 1, so that the seals are mounted so as to be movable in a vertical plane. // -ABOUT 0fc./