SU1284666A1 - Device for removing ingots from ingot moulds - Google Patents

Abstract

The invention relates to the field of metallurgy, in particular to crane equipment for the extraction of ingots from molds. The purpose of the invention is to reduce the drive power while maintaining maximum ejection force during ingot extraction. The device is equipped with controllable brakes 14 and 15, mounted respectively on the drive floor screw 9 and stamp 7, which can fix the position of the internal screw 8 relative to the hollow screw 9 and stamp 7. The internal screw 8 is connected to the stamp 7 rotatably through the thrust bearing 13. The outer and inner threads of the hollow screw are made with one direction and the pitch of the inner thread is less than the outer pitch. The device allows the ejector force to vary depending on the working conditions, which makes it possible to install an actuator whose power is significantly (2-8 times) smaller, as determined by lighter operating conditions, while maintaining the maximum axial force value. 2 Il. § (/)

Description

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The invention relates to metallurgy, in particular, to crane equipment for extracting ingots from molds.

The purpose of the invention is to reduce the drive power while maintaining maximum ejection force during ingot extraction.

FIG. 1 shows the proposed device; in fig. 2 is a view A of FIG. one.

The device contains a cartridge 1, on which in the upper part the gearbox 2 is rigidly attached. The input shaft 3 of the gearbox 2 is connected to the electric motor 6 by means of a coupling 4 with a shoe brake 5.

Inside the chuck 1, the shtampel 7 is moved along guide rotates that exclude turning, by means of a screw system which consists of an internal screw 8 moving inside the drive hollow screw 9 that moves in a fixed sleeve-nut 10 fixed to the gearbox 2. Hollow screw 9 has a square shank 11 freely passing through a square hole in the hub of the output gear 12 of the gearbox 2. The inner screw 8 is connected to the stamp 7 so that it can be rotated through the thrust bearing 13. The outer and inner enn thread of the hollow screw 9 are made of one direction (either both left or both right-handed), and schag internal thread (interfacing hollow screw 9 - internal screw 8) mensche steps outer (interfacing hollow screw 9 - stationary sleeve - nut 10). The difference of the steps of the external and internal threads is selected from the condition of the necessary reduction of the drive power or increase in the effort of the working movement during the extraction of the ingot. During installation movement, the axial force is determined by the weight of the moving parts of the device lifted by the screw system. In the working movement mode, the required axial force increases by the amount of force required to separate the ingot from the mold or pan. The pitch of the internal thread with respect to the external one, depending on the specified conditions, is determined by the formula

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where py is the required axial force of the installation movement;

Pp is the required axial force of the work movement;

Ln is the pitch of the external thread of the hollow screw;

/ IB is the internal thread pitch of a hollow screw.

The screw system is equipped with two shoe brakes 14 and 15. The brake 14 mounted on the screw 9 in the open position does not hinder the rotation of the internal screw 8 relative to the hollow 9,

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and in the closed - fixes screws 8 and 9 relative to each other. The brake 15 is located on the stamp 7 and in a similar way controls the movement of the inner screw 8 relative to the stamp 7.

Large chisels 16 with castor beans having lugs 17 for gripping the ingot mold 18 with ingot, which has a downward extension, and protrusions 19 for pressing the mold, wired upward, are hinged to the chuck 1 from two sides. The control of the large tongs 16 is carried out by the hydraulic cylinders 20.

The small tongs 21 are located in a plane perpendicular to the large tongs 16 and pivotally attached to the crosspiece 22. The ends of the small tongs are provided with rollers 23 on one side moving in inclined grooves of the movable casing 24, on the other side with cores 25 for gripping the profitable part of the ingot. The yoke 22 and the movable sleeve 24 move along the guides of the chuck 1.

The device works as follows.

There are two modes of operation: the installation movement and the labor movement. During the installation movement, as when the ingot is pushed out of the ingot mold broadened downwards, and when the ingot is withdrawn from the ingot mold extended upward, the brake 14 is closed and the brake 15 is open. At the same time, the inner screw 8 moves together with the hollow screw 9 as one unit, and the stamp 7 has a high linear movement speed both up and down, determined by the external thread pitch and the rotational speed of the hollow screw 9. When working, the extraction of the welded ingot is closed; 15, and the brake 14 is open. At this time, the internal screw 8 moves relative to the hollow screw 9, since the latter is fixed by the brake 15 relative to the stamp 7. The moving speed of the internal screw is determined by the difference in the external and internal threads and the speed of rotation of the hollow screw 9. In this case, the ejection force increases accordingly in proportion equal to the ratio of the pitch of the external thread to the difference in pitch of the external and internal threads of the hollow screw 9.

The ejection of the welded to the mold 18 of the ingot 26 with the widening downwards occurs in the following sequence.

The tongues of large tongs 16 are superimposed on the mold so that the lateral projections of the mold 18 fit into the lugs 17. Then the electric motor 6 is turned on, driven by coupling 4 and gearbox 2 through the output gear 12 to the square shank 11 of the hollow screw 9. is closed, and the brake 15 is open and the internal screw, along with the hollow one, is rapidly moving in the setting mode. When the inner screw 8 is set up in the ingot 26 and the axial load increases under the action of the control circuit or operator's command, the brake 14 opens and the brake 15 closes, as a result of which the device switches to the slow-motion mode with increased axial force. Further operation of the screw system will lead to the rise of Patroia 1 and the separation of the large claws 16 of the mold 18 from the ingot 26.

In the process of removing the ingots from the broadened ingot molds, the large flares and 16 are lowered all the way by the projections 9 into the upper end of the mold. In the installation movement mode, the stamp 7 moves up, seizes the yoke 24 and, with their subsequent joint movement, the small claws 21 (Fig. 2) begin to close under the influence of the rollers 23 moving along the inclined slots of the yoke 24, clamping the cores 25 with the profitable part of the ingot. As the axial load increases, the device is switched to the operating mode. The speed of movement of the stamp 7 decreases sharply, and the axial force increases accordingly. The ingot is detached from the mold, while the latter is pressed onto the pallet with large tongs 16.

The separation of the welded ingots from the pallets is performed in the same way as the extraction of ingots from the broadened ingot molds, only with the large tongs 16 resting directly on the pallet, and the ingot mold is previously removed.

When extracting ingots freely emerging from the mold, the device can operate the entire cycle of the installation movement without switching to the operating mode, since in this case large axial forces are not required.

The installation of the internal screw 8 to its initial position after the performed operations is carried out in the mode of working movement at idle speed due to the reversal of movement. The need for such an installation arises after several dozens of operations, since the displacement of the internal screw during the extraction of the ingot is low (several millimeters).

In known stripping devices, the drive power is determined from the condition

creating the maximum force required to separate the welded ingot. At the same time, the power required for free separation of the ingot from the mold or pan is about 10 times less. The proposed design allows varying the pushing force depending on the working condition, which makes it possible to install a drive whose power is significantly (2-8 times) less, since

determined by lighter working conditions while maintaining the magnitude of the maximum axial force. Reducing the installed capacity allows a significant reduction in electricity consumption for ingot extraction operations and the economic effect of using the device. In addition, while maintaining drive power, you can either increase plant capacity by increasing the speed of the installation movement, or increase

axial ingot extraction force.

Claims (1)

Invention Formula A device for extracting ingots from molds, comprising a fixed chuck with clamping tongs, an electric drive connected to a screw system of a transfer mechanism consisting of a fixed sleeve-nut, a hollow screw with external and internal threads, connected by a shaft with a drive reducer and an internal screw connected with a stamp mounted for movement in the guides of the fixed cartridge, characterized in that, in order to reduce the drive power while maintaining the maximum ejection force when removing ingots, it is equipped with brakes installed and. respectively, on the hollow screw and the stamp with the possibility of fixing the position of the inner screw relative to the hollow screw and the stamp, the inner screw is rotatably mounted in the stamp, and the outer and inner threads of the hollow screw are one direction, and the pitch of the inner thread is less than the outer pitch. 25 2