SU711115A1 - Unit for evacuating liquid metal - Google Patents

Description

I

The invention relates to metallurgy, in particular to the design of installations for out-of-furnace vacuum processing of a liquid metal.

A known apparatus for evacuating a liquid metal in a ladle, comprising a steel teeming ladle, a vacuum chamber with a door, movable rails mounted on a frame, fixed rails, a swing cylinder, a frame, a lift cylinder, bearings, a lifting device, a seal, a stop. During the operation of this device, the casting ladle mounted on the trolley is inserted into the vacuum chamber. After the bucket is installed in the chamber, the door is turned, lowered and pressed against the sealing surface of the vacuum chamber. Then the vacuum pumps are turned on and the evacuation process 1 begins.

The disadvantages of this installation are the large metal intensity and the impossibility of achieving sufficient tightness at high temperatures using the sealing surface of the vacuum chamber.

A known apparatus for evacuating a liquid metal, comprising a steel spreading ladle, a weighing device, a gun carriage, a steel truck, a stationary vacuum chamber, a mechanism for rotating the cylinder, two hydraulic cylinders with supports on the bodies and guides. The casting ladle is placed on the weighing device and is supplied by the steel truck under a vacuum chamber. Hydraulic cylinders are installed in working position. With the help of hydraulic cylinders, the bucket moves vertically. Due to these movements, the molten metal is periodically sucked into a fixedly installed vacuum chamber and merged back from it. Thus, metal evacuation occurs 2.

The limitations of this setup are

large metal consumption, inconvenience in operation (it is necessary to put the hydraulic cylinders in working position and remove them), low productivity due to the inability to quickly move the bucket with the liquid metal.

Closest to the proposed technical essence and the achieved result is the installation of a vacuum metal of a liquid metal, consisting of vacuum chamber equipped with a gas cooler, which is installed in the upper part of the vacuum chamber fixedly mounted on the movable platform, hydraulic cylinders lifting the platform, guide column with carriage, vacuum -wires. This installation allows to reduce the temperature of the exhaust gases and, as a last resort, to improve the working conditions of the vacuum joints and vacuum pumps (3.

The disadvantages of the known device are the large metal consumption of the installation due to the fact that a massive guide column is needed to compensate for the cantilever load of the moving platform, which has increased due to the increase in weight of vacuum chambers equipped with a gas cooler;

the laborious process of servicing and repairing a chiller located in a high temperature zone;

increasing the power consumption of the drive for moving the movable platform with a vacuum chamber.

The purpose of the invention is to reduce metal consumption and improve operating and maintenance conditions.

This goal is achieved by the fact that the vacuum chamber and the gas cooler are spaced apart on both sides of the vacuum wire. The gas cooler is mounted with horizontal movement.

FIG. 1 shows schematically a plant for evacuating a metal, a general view; in fig. 2 - gas cooler.

 The installation includes a vacuum chamber 1 with a nozzle 2 connected via pipeline 3 to a gas cooler 4 installed on the opposite side of the vacuum chamber 1 on frame 5 and connected using a hinge pipeline 6 to a vacuum pump (not shown). The frame 5 has the ability to move along the column 7, installed between the vacuum chamber 1 and the gas cooler 4. The frame 5 moves but the column 7 is carried out using the hydraulic cylinder 8. The gas cooler 4 is equipped with a trolley 9, which can freely move relative to the frame 5 on the stand 10. Under the vacuum camera install bucket 11 with liquid metal. The installation works as follows. By means of the hydraulic cylinder 8, the nozzle 2 of the vacuum chambers1 1 1 is periodically lowered into the bucket 1 with metal. At the same time, the exhaust gases from the vacuum chamber 1 through the pipe 3 enter the gas cooler 4 and are cooled by contact with the surface of the coil (not shown), which are connected to the shop water supply system. Next, the cooled gas through the hinge pipe 6 enters the vacuum pump.

The gas pumped out of the vacuum chamber 1 has a temperature of 1000-1-1200 °. The passage of the pipeline 3, it strongly warms the last.

When rigidly mounted on the frame 5 of the vacuum chamber 1 and the gas cooler 4 connected by pipeline 3, the system is a rigid, frame, statically indefinable design. The deformation forces during expansion and, as a result, increased pipeline lengths can lead to system failure. In order to prevent this, the gas cooler is mounted on a carriage 9 having the possibility of moving in a horizontal plane.

on the bench 10, which is fixedly mounted on the frame 5, which makes the system statically determinable with one floating support (trolley), receiving the effort from thermal deformations.

The location of the vacuum chamber and the gas cooler 4 at the opposite ends of the frame 5 greatly improves the working conditions of the column 7. This is because the concentrated load on the weight of the vacuum chamber and the gas cooler located console on one side of the column, bending moment perceived last, It is one-sided, which negatively affects the raising and lowering of the vacuum chamber. When the vacuum chamber and the Gas Cooler are located at different ends of the frame, the moments due to their weight tend to balance the system, i.e., the difference in these moments is perceived by the column, which greatly simplifies the conditions of the operation of the structure.

This unit for evacuating a liquid metal is structurally simple, simplifies the conditions of operation of the structure, its maintenance and repair, and increases the durability of the installation.

40

Claims (3)

1. USSR Author's Certificate No. 345209, cl. C 2 C 7/10, 1970. 2.Avtorskoe with} regions of USSR) J, № 304310, cl. From 21 to 7/10, 1968 3.Lvgorskoe certificate (№ 335291. CL. C 21 C 7/10, 1970.