SU414774A3 - - Google Patents

Description

DEVICE FOR MANAGEMENT OF STOPPING CASTING

BUCKET

This invention relates to the field of metallurgy, in particular to metal casting.

A device for controlling a stonor of a casting ladle is known, comprising a hydraulic jack, the cylinder of which is fixedly mounted on the casting ladle, and the piston mounted inside the cylinder is connected to a stopper; pipelines for the supply and removal of fluid from the cylinder, and the pipelines are connected through three-way valves with either a pressure or a slave line.

However, such a device does not provide the possibility of raising the stopper and a large distance and breaking it down a shorter distance.

In order to eliminate this drawback, the proposed device is equipped with an additional piston installed inside the cylinder of the joint with the iRW and independently of it, and with the pipeline connecting the cavity between the pistons with the pressure-drain line.

FIG. 1 shows schematically the described device in section (the flap is shown in the closed position); in fig. 2 - the same (flap in the wide-open position); FIG. 3 - the same (the latch in the position of diminished open).

2

The device is suitable for controlling the stopper of casting ladles having refractory masonry, inside of which there is a molten metal shell, such as cast iron. The bucket 1 has a casting hole 2 and a stonor 3 for closing the hole 2. The stopper 3 is controlled by a jack, the cylinder 4 of which is fixed to the bucket 1.

The jack contains two pistons, mounted in series. of the pistons 5 located below n is a movable support. The second piston 6 is located at the top and is an organ for raising the stopper 3.

The support piston 5 is continued from below by the rod 7, which passes through the bottom of the cylinder 4 and has a thread 8 at the end. And this thread part is; the nut 9 is screwed in, adjusting to the support on the bottom of the cylinder 4 - the useful length of the rod 7. i.e. the upper active position of the piston support.

The piston 6 is extended upward by a rod 10 connected to the crossbar 11 controlling the stopper 3. The rod 10 has a diameter larger than the diameter of the rod 7, such that it has a useful cross section c11; ; 1; 11 tons of pipeline gripe 12, 13, 14 liquid or gas. Pipelines 12 and 14 approach the ends of the cylinder, respectively, below the bottom surface of the piston 5 and above the top surface of the piston 6, and the pipe 13 - between the middle parts of the cylinder between the opposed surfaces of the pistons 5 and 6.

Each piping 12, 13 and M is connected either to the pipelines (), ohm 15 is blocked by pressure, l.ib, with the Hi discharge pipe when the solenoid valves are three drips that 19. Spool 1contuning anti-electromagnet 20 and return spring. In position I of the spool, the pipeline (12, 13 or 14) is connected to pipeline 15 by a liquid or gas under pressure. In position II, the pipeline (12, 13 Il “14) is connected to the discharge pipe 16.

The device works as follows.

Before the operation is carried out, the stopper 3 is cast (Fig. 1) is in the closed position of the casting hole 2 due to the supply of pipeline 14 with liquid or gas; The pipes 12 and 13 are discharged, the solenoid valves being in the position shown in FIG. 1. In this case, the piston 5 is in the lower position, resting on the inner bottom of the cylinder 4, the piston b rests on the piston 5 and is located at a maximum distance from the upper bottom of the chi.

In order to perform the casting operation, a large opening of the opening 2 is first ensured by raising the stopper to its upper position (Fig. 2) IB as a result of unloading the pipeline 14 and filling up the pressure of the pipelines 12 and 13. The lower support piston 5 does not move, so the large upper surface is affected by the same pressure as on the lower circular surface. In contrast, the upper piston is raised up to the stop s, the upper bottom of the cylinder 4. Its stroke is equal to a. The stopper 3 is nod by the value of a (φ, ig. 2) and completely releases the hole 2, which allows the iron to flow at its high consumption. The cast iron heats the refractory walls of the casting bore 2. The stopper 3 rises a large distance a instantaneously (on the order of 1 second for a valve of normal dimensions and more, in the case of large shutters).

Immediately after this operation, conduit 13 is introduced for unloading, and conduit 14 is again read out under pressure (Fig. 3). The support piston 5 rises from the distance b to the support of taikey 9 about the bottom of n. Cylinder 4, while: Kaav the piston 6 is again lowered into

due to the fact that the rod 7 has a smaller diameter than the rod 10, the cross section of the piston 5, which is influenced from bottom to top by the pressure of the working medium of the pipeline 12, is larger than the cross section of the piston 6, which pressure acts from top to bottom. Thus, the force HOD11JA-1II of the piston 5 is greater than the force of lowering the piston O; Next 1, Ovatel1) 11o, Norshen 5 nodde) per day, in the upper-nem. IK-IMBHOM sex,) on raschetii /; over the bottom of the jack 4, not onus action node. piston b. The latter cannot, therefore, descend from its upper position (Fig. 2), much less than a-b.

Thus, the stopper 3 is brought to a closer position to the hole 2, at a distance b from the seat, so that the flow area is reduced, and the flow of iron is limited. To completely stop the cast iron from flowing out, devices 7, 18 and 19 are returned to the position shown in FIG. one.

Thus, the opening 2 opens into two ethane in a short time for full opening; by raising the stopper 3 to

The distance a and then opens with a limited flow area of the opening 2 by lowering the stonor 3 until it is completely closed (lifting a-b), this limits and controls the flow rate.

Strong heating of the refractory wall of the casting hole 2, which occurs due to the initial increased consumption of cast iron, prevents solidification of the cast iron near the hole and clogging of this hole even when the stopper 3

is the IB position of the narrowing of the orifice (Fig. 3).

The cast iron consumption can be changed by changing the stroke L of the supporting piston 5 due to the nut 9 screwed on the threaded section 8.

Subject invention

A device for controlling a stopper of a foundry bucket containing a jack, a cylinder

which is fixed on the casting ladle, and the piston mounted inside the cylinder is connected to the stopper; liquid piping connected to the cylinder but both sides of the nipples, c pipe and pipelines are connected to three-way valves or with a pressure or drain line, characterized in that, in order to allow the stonor to be raised to a greater distance and put on less

distance, it is provided with an additional hole, installed inside the cylinder, coaxially with the first and independently of it, and a pipe connecting the cavity between П01ршнн .111 with the HaiHOpHo-drain line.

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