DD146152A1 - DEVICE FOR LIMITING THE LEVEL IN FOUNTAINS - Google Patents

Abstract

The invention relates to a device for limiting the filling level in Gieszvorrichtungen, preferably in Vakuumdruckguszeinrichtungen, with the aim to increase the Arbeitsproduktivitaet, especially in the production of thin-walled workpieces. The object is to carry out the control of shut-off valves for the metal with electrical means, which are actuated by the liquid metal. The object is achieved by arranging an overflow channel in casting devices in an arrangement provided between a die-casting mold and a suction channel, i. with d. Suction channel is connected. In the wall of the arrangement, a projecting into the overflow channel contactor is used, which can be acted upon by the liquid metal. In the overflow channel a Absperrko shut-off Absperrkoerper is present, which is actuated by a control magnet. The control solenoid is triggered via a relay by the contactor. The overflow channel is designed as a labyrinth. Areas of application: Gieszvorrichtungen, in particular Vakuumdruckguszeinrichtungen.

Description

Title: Device for limiting the level at

The invention relates to a device for limiting the level of pouring devices, in particular Vakuumdruckgußeinrichtungen, preferably for the production of thin-walled workpieces, as found in precision appliance application.

Various devices are known for level measurement of liquids

In particular, in the level measurement and control of electrically conductive liquids, including molten metal are to be expected, electrical contacts or probes are provided in the container wall, are operated v / elche conical circuits for controlling valves ("The expertise of the engineer", Bd Part 1, Fachbuchverlag Leipzig 1964, pages 590 - 592).

In DE-OS 2 636 681 a device for preventing the ingress of liquid Uetalls is described in the vacuum line of a die casting machine, in which between a vent channel of the die and a vacuum umleitung a power section is provided, the cross section over its length is at least as large as the cross-section of the ventilation channel. The cross section

of the power section, however, passes in the direction of flow of the metal in a slit-shaped cross-section, which reduces the wall thickness of the metal to such an extent that the metal flow comes to a standstill «

However, this device has the disadvantage that a freezing of the molten metal in the narrowed pipe sections is not prevented with certainty and therefore the whole control system is ineffective. Also

Ί0 impurities in the melt can interfere with the level by prematurely closed the slot-shaped cross-section and thus the mold is not fully filled, "Another disadvantage is that with increasing cross-sectional constriction, the negative pressure in the mold does not remain constant.

The purpose of the invention is to eliminate the deficiency of the prior art and to reduce the downtime of the casting plants and thus to increase the labor productivity of such plants and facilities *

The invention has for its object to provide a device for limiting the level in Druckgußein- directions, in which the control of shut-off valves for the metal is carried out by electrical means, which actuated by the liquid metal in the die are.

According to the invention, this object is achieved by a device for limiting the fill level in casting devices in that a, designed as a labyrinth overflow channel is arranged in, between a die and a suction channel provided arrangement _.

wherein in the wall of the arrangement an electrically opposite

the wall insulated contactor, which enters into the overflow channel and is acted upon by the rising _} liquid metal, is inserted, that in the overflow channel in the wall of the arrangement the Absperrkanal shut-off shut-off body is arranged, and that the contactor in a, ßiis. Relay for actuating the control magnet triggering circuit is introduced «

The educated as a lab Üb erlaufkanal is designed so that the liquid IvIetall is delayed in its increase according to the start delay of the 'relay and the control magnet until the shut-off has closed the suction safely »

Thus f-fe = e ^ r | guaranteed before al learning at Vakuumdruckgußeinrichtungen of the type mentioned sure that the liquid metal can not get into the suction channel _? which would result in disassembly of the shut-off body and possibly an "exchange of metal-contaminated components and thus downtime of the device." Another advantage is also that subjective influences are eliminated by the operator *

The invention will be explained in more detail below with reference to an exemplary embodiment. In the accompanying drawing show:

Fig. 1 is a section through the device, Fig «2 is a view A-A of the overflow channel and Fig. 3 shows the electrical circuit diagram of the Einrich-. device for controlling the shut-off body

Referring to FIG. 1, an arrangement is provided between a molding die 1 and a suction duct 2, is arranged in v / hich designed as a labyrinth overflow channel 4 _e in the wall of the assembly 3, a Eontaktgeber 5 is provided ,, which electrically opposite to the arrival

  - 4 - Ä

Order 3 is isolated and the contact with the rising in the Druckguf3form 1 and the overflow channel 4 liquid metal closes an electrical circuit in which a relay 6 z.ur actuation of a control magnet 7 is arranged (Fig. 3). This contactor 5 protrudes into the overflow channel 4. In the arrangement 3, a suction channel 2, blocking shut-off 8 is also used, which is connected to the armature 9 of the control magnet 7 and operated by this

The overflow channel 4 designed as a labyrinth according to FIG. 2 is designed in its length and shape so that the liquid metal is delayed in its rise in accordance with the starting delay of the Heiais 6 and the control magnet until the shut-off body 8 secures the suction channel 2 securely closed. In this way will be prevented with certainty _? That metal mist or gax liquid metal can get into the suction channel 2 _e The length of the delay line, which is given by the overflow channel 4, depends, among other things, on the size of the vacuum in the suction channel 2.

In the circuit diagram shown in Fig. 3, the relay with the contactor 5 electrically connected. Meets the liquid metal on the contactor 5, the circuit is closed and the relay 6 switches, a contact K 1 to. Thus, the circuit in which the control magnet 7 is arranged, closed and the armature 9, which is connected to the shut-8, attracts. The intake passage 2 is closed by the shut-8.

The in Fig _o 3 with χ ,, Xpt ^X 3? ^x ui ^x * designated connections represent terminal block contacts. To power the contactor 5 and the relay 6 containing circuit, a control transformer T and a rectifier Gl are provided

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Claims (2)

E rf Induii ^ sansprii ch: A "level-limiting device" in G-directional devices, in particular Valmiimdruckgiißeinrichtungen comprising a arranged between a die and a suction channel arrangement, are provided in which means for limiting the increase of the liquid metal, characterized in that in between the die (1) and the suction channel (2) provided arrangement (3) designed as a labyrinth Überlatifkanal (4) is arranged, which is connected to the suction channel (2) and the die (1), wherein in the wall of the arrangement (3 ) an electrically insulated from the wall contactor (5) which projects into the overflow channel (4) and is acted upon by the rising, liquid metal j is inserted, that in the overflow channel (4) in the V / and the arrangement (3) the Absaugkanal (2) shut-off shut-off (8) is arranged, which is connected to the AnIcer a control magnet (7), \ md that the Iiontaktgeber (5) i n one, a relay (6) for actuating the control solenoid (7) auslöcenden circuit is inserted. 2 «device according to item 1, characterized in that the overflow channel (4) is designed so that the liquid metal in its increase in accordance with the starting delay of P.clais (6) and the control magnet (7) is delayed until the shut-off body (8) has safely closed the suction channel (2), 35oo Bierzu ... iL ... $ ei en drawings -