RU2520172C1 - Rolled stock descaling plant - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: proposed plant comprises the frame with sprayers fitted at movable support, fluid and gas feed manifolds. Sprayer cases feature stepped axial channel with seat at lower part and adapter at top part. Cylindrical ledge with conical bearing surface is arranged inside said stepped axial channel. Besides, there is feed pipe with ledge and thrust bush arranged to get to simultaneous conical surface of cylindrical ledge and inner conical surface of stepped axial channel of the case. Said feed pipe accommodates hollow valve extending beyond the seat and combs with nozzles. Note here that aforesaid support has pulse gas head composed of the case with ledge in axial channel and toroidal chamber with balls equipped with nozzles. Has head case axial channel is closed from above by cover with gas manifold feed pipe and, from below, by plug with bolt at the centre extending into axial channel ledge. Note here that gas head case is equipped with several tangential channels to communicate its axial channel with toroidal chamber inner space.

EFFECT: shock-wave structure with circulation zones and transient zones and fluid and gas feed modes.

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Description

The invention relates to metallurgy, and in particular to a device for descaling using liquid and compressed air.

A device is known for removing scale from hot rolled products (see as.with. No. 1477495, μl. B21B 45/08, publ. 07.05.89 Bul. No. 17).

The invention is mounted on a frame and includes nozzles spring-loaded relative to the base.

A guide in the form of a wedge diverging from the center and a collector in communication with the compressed air system are located in front of the hydraulic breakdown working zone. Through the hinge, the swinging levers of the frame are connected to the pneumatic cylinder.

A cooler (water) is supplied to the nozzles while supplying compressed air to the manifold.

The coolant jet acts on the surface of the car with the destruction of scale. In this case, the spent cooler spreads over the rolled surface, part of the flow is cut off from further spreading by supplying compressed air leaving the slotted nozzles of the collector into the gap between the lower edge of the guide and the rolled surface.

The guide leads the flow of spent cooler from the surface of the car.

The disadvantages of the device.

1. The supply of compressed air to the zone of interaction with hot rolled is directed primarily to prevent the spreading of the liquid cooler, and not to the destructive effect of the jet on the scale layer.

2. The flows of the cooler and compressed air are constantly directed to the surface of the hot rolled products with constant parameters for flow and pressure, which reduces the effectiveness of the impact.

3. Compressed air does not have a significant effect on the scale layer during direct feed without imposing hydrodynamic pulses on the flow.

Pat. RF №2297895, μl. B21B 45/08, publ. 04/27/2007 - “Spray beam of a hydraulic installation for descaling”. The device is designed to remove scale using high pressure liquid jets.

The device consists of a spray beam with a distribution pipe, from which feed channels extend to the nozzles. The nozzles are arranged in a row and are connected hydraulically to the power source.

By means of an electro-hydraulic control device, water at high or low pressure is selectively sent to the supply pipe.

In front of each nozzle, check valves with a spring-loaded shut-off element are installed, which stop the access of water to the nozzles when the supply is stopped from the high pressure source.

Design flaws.

1. The need for accurate synchronous adjustment of each of the check valves to the calculated differential pressure.

2. The use of an electro-hydraulic drive for controlling the device complicates the operation of the device due to the need to protect the equipment from moisture.

3. The complexity of controlling the installation with the simultaneous absence of a mechanism for adjusting each nozzle, namely the angle of inclination, the distance to the rental.

Optimization of the parameter of the jets flowing from the nozzles requires tuning to the mode. It is known that the efficiency of the destruction of scale increases with a change in the regime of the outflow of the jet from the nozzle and the frequency of exposure to dynamic pressure on each individual section of the hot rolling. This mode of interaction between the jet and rolled metal is not provided for in this design.

A known design of a device for supplying liquid to the surface of a hot rolled product with the aim of destroying and removing scale from its surface (see US Pat. RF No. 2247617, µl. B21B 45/08, publ. 09/29/2003).

The device consists of a housing with a holder with nozzles located in it, a mechanism for lifting and turning the nozzles, a linear movement mechanism in the form of a sectional drive shaft mounted in the housing, with its longitudinal axis located in the same plane with the longitudinal axis of the holder. The bracket has a slotted hole, shaft sections are installed by shanks in the slotted holes of the previous sections.

Brackets are mounted on external threads with the ability to move along the holder along its longitudinal axis. The nozzles are mounted in brackets, and the mechanism for lifting and turning the nozzles is interconnected with the body and holder.

The disadvantages of the design of the device include:

1. The use of an electric drive for lifting and turning nozzles, the axial movement of the nozzles, is aimed at improving the efficiency of the process of descaling. But the control of this drive is carried out by the operator and is subjective. Since the operation of the device is carried out in an atmosphere of high humidity, it is necessary to protect the electrical equipment from moisture, which is negative.

With a stable range of products, i.e. when hot rolled metal has the same geometric dimensions, stable temperature and speed, there is no need to ensure constant reconfiguration of the installation to the optimum mode.

A device and method for removing scale using water (see US Pat. RF No. 2129053, µl. B21B 45/08, publ. 04/20/1999).

The device and method are designed to remove scale by water jets when hot rolled products are supplied at high speed, on the order of 0.025-0.033 m / s.

The device has a working zone in which water removing the scale acts on the surface of the car with a break phase, in which the water removing scale does not affect the surface of the car, which, according to the authors, increases the effect of destruction and removal of scale.

To remove scale, rotate the brackets and nozzles, which must be synchronized with the feed rate of hot rolled products.

Rotation is transmitted to the bracket using an engine and gearbox with a liquid cooler supply system, which makes installation difficult in design and maintenance.

The technical result that can be obtained by implementing the invention is reduced to the following:

- automatic change of fluid pressure with a frequency effect on the surface of the car with the effect of cooling the scale and its breaking;

- hydrodynamic effects of high-speed gas flow on the surface of the car with a pulsed change in the flow of gas to each of the nozzles;

- the creation of a shock-wave structure on the surface of the rental with the emergence of circulation zones and non-stationary modes;

- alternating impulse action on the rental area with a liquid stream and a pulsating gas stream.

The technical result is achieved by the fact that the installation for removing scale from rolled products contains a frame with nozzles on a movable bracket with collectors for supplying liquid and gas.

The nozzle body is made with a stepped axial channel equipped with a saddle in the lower part and an adapter in the upper one, with a cylindrical protrusion with an external conical bearing surface that extends into the stepped axial channel, in which tangential channels are made and a supply pipe with a protrusion and a thrust sleeve installed with the possibility of interaction with the conical supporting surface of the cylindrical protrusion and the inner conical surface in the stepped axial channel of the housing. The supply pipe is equipped with a hollow valve resting on the seat and passed through its axial channel, and a comb for supplying jets of liquid. The bracket is additionally equipped with a pulsed gas head, consisting of a housing with a protrusion in the axial channel and a toroidal chamber equipped with nozzles. The axial channel of the housing is blocked from above by a lid equipped with a supply pipe of the gas manifold. Bottom of the housing contains a plug with a bolt in the axial channel, passed through the axial channel of the protrusion.

The housing is equipped with a number of tangential channels connecting its axial channel with the internal cavity of the toroidal chamber equipped with freely mounted balls.

The design of the descaling plant is illustrated by drawings, where:

figure 1 - General layout of the installation;

figure 2 is a General view in section of a hydraulic spray device;

figure 3 is a General view of a pulsed hydrodynamic gas nozzle in the context;

figure 4 is a cross section of a gas nozzle in place of the tangential supply of a gas agent.

The descaling installation consists of a frame 1 with a hydraulic spraying device 2 installed on it (see FIG. 2), consisting of a housing 3, in the stepped axial channel 4 of which a saddle 5 and a sub 6 are installed, with a cylindrical protrusion 7 and a conical supporting surface 8 Inside the stepped axial channel 4, a supply pipe 9 is installed with a protrusion 10, on which the thrust sleeve 11 rests with the possibility of contact with the inner conical surface in the stepped axial channel 4 of the housing 3. At the lower end of the supply pipe 9 A hollow valve 12 is mounted with support on the seat 5, which extends beyond its limits through the axial channel 13 of the seat 5 and is equipped with a comb 14 with nozzles 15.

The axial channel 16 of the sub 6 at the location of the cylindrical protrusion 7 is connected by tangential channels 17 with a stepped axial channel 4 of the housing 3. Behind the hydraulic spraying device 2 (along the rolling direction), a pulse gas head 18 is installed on the frame 1, consisting of a housing 19 enclosed with an external the sides of the toroidal chamber 20 with nozzles 21. On top of the housing 19 is provided with a cover 22, connected through a supply pipe 23 with a gas manifold.

Bottom, the axial channel 24 of the housing 19 is insulated by a plug 25. In the axial channel of the cover 22, a support protrusion 26 is made with a number of longitudinal grooves 27 (see FIG. 3), in which a hole 28 is made. A hole is made axisymmetrically in the plug 25 and a bolt 29 with a nut is missing 30. A number of tangential channels 31 are made in the body of the housing 19, hydraulically connecting its axial channel 24 with the internal cavity 32 of the toroidal chamber 20, inside of which at least two balls 33 are freely placed.

The nozzles 21 are made in the body of the toroidal chamber 20 only on the segment facing the hydraulic spray device 2 (see figure 4).

A hydraulic spray device 2 and a pulsed gas head 18 are mounted on the frame 1 with the possibility of adjusting their position relative to the rental with a change in the angle of attack and the distance to the rental.

Installation work.

On the frame 1, a hydraulic spraying device 2 is installed with the location of the comb 14 with nozzles 15 above the car. On the same frame 1 set the pulse gas head 18 with the location of the toroidal chamber 20 above the rolled products in such a way that the nozzles 21 are located above the rolled to meet its movement. Connect a hydraulic atomizer 2 with a gas manifold.

Open the supply of liquid and gas to the device. The fluid flow through the tangential channels 17 is supplied with twisting into a stepped axial channel 4 with the impact on the surface of the thrust sleeve 11, which leads to its rolling on the inner surface of the housing 3 with the rotation of the hollow valve 12 relative to the seat 5 and the fluid in the axial channel of the supply pipe 9, from where the flow enters through the hollow valve 12 into the axial channel of the comb 14 and then through the nozzles 15 acts on the surface of the mill scale. Moreover, in the process of rotation of the supply pipe 9 along with comb 14, the angle of attack and the distance to the surface of the rolled product change, which intensifies the process of scale destruction. In this case, the rolled product moves relative to the hydraulic spray device 2 and passes to the pulse gas head 18 under the influence of a supersonic gas stream flowing out of the pulse gas head 18. The surface of the rolled metal is exposed by supplying a gas stream to the axial channel 24 of the housing 19, from where it passes through the tangential channels 31 the swirling flow is fed into the inner cavity 22 of the toroidal chamber 20 with the rotation of the balls 33 on the inner surface. In this case, balls 33, rolling inside the toroidal chamber 20, sequentially shut off the gas flow supplied to the nozzle 21. Thereby, a sequential pulse supply of a gas stream to the rolled surface occurs, which increases the efficiency of destruction and removal of the partially destroyed layer of scale upon preliminary exposure to it liquids.

An analysis of the technical solutions selected during the patent research showed that there is a known method for removing scale from a hot-rolled strip (see US Pat. RF No. 2284234., Μl. B21B 45/08, published on 09.27.2006), where a design allowing to form a pulsating controlled gas flow using a pulsed exciter, which ensures the efficiency of descaling from the surface of the car.

Claims (1)

Installation for removing scale from rolled products, containing a frame with spraying devices mounted on a movable bracket, fluid and gas supply manifolds, characterized in that the spraying device bodies are made with a stepped axial channel having a saddle in the lower part and an adapter in the upper part, with inside a stepped axial channel, a cylindrical protrusion having a conical abutment surface and a supply pipe with a protrusion and a thrust sleeve mounted with simultaneous contact with a conical supporting surface of the cylindrical protrusion and an inner conical surface of the stepped axial channel of the housing, the feed pipe is provided with a hollow valve extending beyond the seat and a comb with nozzles, and the bracket has a pulse gas head consisting of a housing with a protrusion in its axial channel and toroidal chamber with balls equipped with nozzles, and the axial channel of the gas head housing is blocked from above by a cover with a supply pipe of the gas manifold, and from below by a plug with a bolt in the center passed into the protrusion of the axial channel, while the gas head housing is provided with a number of tangential channels hydraulically connecting its axial channel with the internal cavity of the toroidal chamber.

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