KR101277936B1 - Apparatus for removing scale in outlet roller of heat treatment using dry ice blasting - Google Patents

Abstract

The present invention relates to an apparatus and method for removing a feed roll scale from a heat treatment furnace in which a dry ice injection method is applied, and is disposed below the feed roller in a heat treatment furnace, and sprays dry ice particles toward the surface of the heat transfer furnace. Dry ice particles to spray high pressure dry ice particles through a dry ice spray nozzle unit provided to peel the scale adsorbed on the surface, a dry ice storage unit and a dry ice spray nozzle unit filled and stored dry ice particles, and It consists of a configuration including an air compression unit provided to provide the compressed air to be mixed, it is possible to completely remove the scale adsorbed on the exit feed roll by the heat treatment, it is possible to prevent surface defects of the heat-treated finished plate product in advance.

Description

Apparatus and method for descaling outgoing feed rolls by heat treatment with dry ice spraying method

The present invention relates to an apparatus and a method for removing a scale of an exit feed roll by a heat treatment furnace to which a dry ice spray method is applied, and by removing the scale adsorbed to the exit feed roll by a heat treatment furnace by a dry ice spray method, to prevent surface scratches of a thick plate product. It is a technology related to an outgoing transfer roll descaling apparatus and method by a heat treatment applied dry ice spray method.

Thick plates are mainly used for large bridges, ships, building structures, pressure vessels, etc., and are relatively thick hot rolled steel sheets having a thickness of 6 mm or more.

In order to manufacture a thick plate, impurities are removed from iron ore, and the sintering process and the blast furnace are moved to the converter of the steelmaking facility, followed by desulfurization and dephosphorization. The steel slabs are then rolled, accelerated cooled, and heat treated to meet the final product and are then manufactured into products with good properties and high flatness.

However, in the case of such a thick plate product, a scale may be generated on the surface during heat treatment, and the scale may be adsorbed onto the exit feed roll by the heat treatment to cause surface defects (particularly, scratches on the lower surface) of the thick plate product. Can be.

An object of the present invention is to prevent the phenomenon caused by the surface defect of the thick plate product as the scale generated in the thick plate product during the heat treatment is adsorbed on the exit feed roll by the heat treatment, by spraying high pressure dry ice particles on the exit transfer roll in the heat treatment furnace It is to provide an outgoing feed roll descaling apparatus with a heat treatment applied to a dry ice spray method that can effectively remove the scale.

Another object of the present invention is to spray the high-pressure dry ice particles on the exit feed roll of the heat treatment furnace in order to prevent the phenomenon that the scale generated in the thick plate product during the heat treatment is adsorbed on the exit feed roll by the heat treatment causing the surface defects of the thick plate product The present invention provides a method for removing the scale of the exit feed roll by a heat treatment to which a dry ice spray method is applied to effectively remove scale.

According to the spirit of the present invention, a dry ice spray nozzle unit disposed to be spaced apart from the exit feed roll of the heat treatment furnace, and sprayed dry ice particles toward the surface of the exit feed roll of the heat treatment furnace to peel off the scale adsorbed on the surface. ; A dry ice storage unit filling and storing dry ice particles; And an air compression unit provided to provide compressed air to be mixed with the dry ice particles so as to spray the high pressure dry ice particles through the dry ice injection nozzle unit. Provide the device.

In this case, the dry ice injection nozzle unit may be provided with a spray hole formed to spray the dry ice particles in the vertical direction toward the lower surface of the exit feed roll by the heat treatment.

Further, at the inlet side of the injection nozzle unit, a mixing chamber for mixing and storing the dry ice particles supplied from the dry ice storage unit and the compressed air provided from the air compression unit may be further provided.

In addition, a dry ice supply pipe may be formed between the mixing chamber and the dry ice storage unit to supply and transfer dry ice particles.

In this case, a dry ice control valve may be provided on the dry ice supply pipe to control the flow of the dry ice particles from the dry ice storage unit to the mixing chamber.

The compressed air supply pipe for supplying compressed air may be connected between the mixing chamber and the air compression unit.

In addition, on the compressed air supply pipe, a compressed air control valve for opening and closing the compressed air flow from the dry ice reservoir to the mixing chamber may be provided.

At this time, the compressed air regulating valve is preferably a pressure regulating valve for maintaining a constant flow pressure of the compressed air.

In addition, according to the idea of the present invention, the dry ice spray is arranged to be spaced apart on the lower side of the exit feed roll of the heat treatment furnace, to spray dry ice particles toward the surface of the exit feed roll of the heat treatment furnace to peel off the scale adsorbed on the surface. Nozzle unit; A dry ice storage unit filling and storing dry ice particles; An air compression unit provided to provide compressed air to be mixed with the dry ice particles so as to spray the high pressure dry ice particles through the dry ice injection nozzle unit; A scale detection unit configured to monitor the surface state of the exit feed roll by heat treatment to obtain scale state information adsorbed on the surface; And a control unit configured to determine and control the injection pressure of the dry ice particles to be injected from the dry ice injection nozzle unit by using the obtained scale state information. do.

At this time, the scale detection unit, by irradiating the laser light to the surface of the exit feed roll by a heat treatment, and by imaging the amount and distribution of the scale adsorbed, to obtain the scale state information adsorbed on the surface of the exit feed roll by heat treatment It is preferable that it is a laser vision sensor.

The controller may include a data input unit configured to receive scale state information obtained through the scale detector; And a data calculation unit comparing the received scale state information with a reference value and determining and controlling the injection pressure of the dry ice particles to be injected from the dry ice injection nozzle unit.

In addition, according to another idea of the present invention, the method includes: (a) obtaining scale state information adsorbed on the surface of the exit feed roll by a heat treatment; (b) calculating the injection speed and pressure of dry ice particles after comparing the obtained scale state information with a reference value; And (c) controlling and controlling the supply amount of dry ice particles and the pressure of the compressed air to be mixed with the dry ice particles according to the calculated spraying speed and pressure of the dry ice particles. Provides a method for descaling outgoing feed rolls.

Here, the step (a), (a-1) the step of irradiating the laser light to the surface of the exit feed roll by the heat treatment; And (a-2) photographing the heat-treated exit feed roll surface image by the irradiated laser light to obtain scale state information after image processing.

According to the present invention and the method for removing the feed roll scale of the exit plate in the heat treatment furnace applied dry ice injection method, the problem that the surface defect of the thick plate product is caused as the scale generated in the thick plate product during the heat treatment is adsorbed to the exit feed roll by the heat treatment, It is possible to remove the adsorbed scale by using dry ice particles sprayed directly on the exit feed roll by the heat treatment, and there is an advantageous technical effect that can improve the quality and productivity of the thick plate product together.

In addition, in the present invention, the dry ice spray method applied to effectively remove the scale adsorbed on the exit feed roll by the heat treatment, the instantaneous collision of dry ice particles to the surface of the exit feed roll in the heat treatment furnace, and immediately sublimates the scale. As a peeling method, there is an advantage that does not adversely affect the shape and material properties of the transfer roll.

1 is a view illustrating a phenomenon in which the scale is generated in the exit feed roll by the heat treatment,
2 is a view showing a state that the scale is adsorbed on the exit feed roll by the heat treatment,
3 is a view schematically showing a device for removing a feed roll scale from a heat treatment furnace to which a dry ice injection method according to a first embodiment of the present invention is applied;
FIG. 4 is a view schematically showing a device for removing a feed roll scale from a heat treatment furnace to which a dry ice spray method according to a second embodiment of the present invention is applied;
Figure 5 is a flow chart illustrating a method for removing the exit feed roll scale of the heat treatment furnace applied dry ice spray method according to an embodiment of the present invention,
6 is a flowchart showing the detailed steps of the step (S100) of obtaining scale state information adsorbed on the surface of the exit feed roll by heat treatment in the flowchart shown in FIG.

Hereinafter, an apparatus and a method for removing a feed roll scale from the exit side of a heat treatment furnace to which a dry ice injection method according to an exemplary embodiment of the present invention is applied will be described.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Prior to describing the apparatus and method for removing the feed roll of the exit roll from the heat treatment furnace in which the dry ice injection method is applied according to a preferred embodiment of the present invention, the phenomenon in which scale is generated in the exit feed roll of the heat treatment furnace will be briefly described.

1 is a view illustrating a phenomenon in which the scale is generated in the exit feed roll by the heat treatment.

In the case of a thick plate heat-treated product, as the thick plate S undergoes a process by the heat treatment furnace 20, scale is generated on the surface. This scale is adsorbed on the feed roll 10 of the exit section A of the heat treatment furnace 20.

In this way, the scale adsorbed to the delivery roll 10 of the exit section A of the heat treatment furnace 20 causes surface defects (for example, scratches) on the lower surface of the thick plate S product. The scale generated on the thick plate (S) may be peeled off through the shot blasting (30), etc., but the removal of the scale that is adsorbed on the feed roll 10 is difficult.

Referring to FIG. 2, the shape of the scale C that is adsorbed on the exit feed roll 10 by heat treatment may be confirmed.

In this way, the surface failure is inevitably caused on the lower surface of the thick plate (S) that is in contact with the feed roll 10, the scale (C) is present on the circumferential surface.

In the drawings, FIG. 3 is a view schematically illustrating an apparatus for removing a delivery roll scale from a heat treatment furnace to which a dry ice injection method according to a first embodiment of the present invention is applied, and FIG. Figure is a schematic view showing a side feed roll descaling device with a heat treatment applied ice spray method.

3 and 4 clearly illustrate only the main features in order to conceptually clearly understand the present invention, and as a result, various modifications of the drawings are expected, and the scope of the present invention is determined by the specific shapes shown through the drawings. Need not be limited.

However, in the case of the first embodiment shown in FIG. 3, the present invention relates to a schematic configuration of a device for removing the exit feed roll scale by a heat treatment to which a dry ice injection method is applied, and in the case of the second embodiment shown in FIG. 4, the first embodiment. As the scale detection unit and the control unit are added to the example configuration, it will be apparent that the active control of the device is implemented.

First, referring to FIG. 3, a schematic configuration of an apparatus for removing a feed roll scale from the exit side of a heating furnace according to the present invention will be described.

First Embodiment

3 is a view schematically showing a device for removing a feed roll scale from a heat treatment furnace to which a dry ice injection method according to a first embodiment of the present invention is applied.

Referring to Figure 3, the heat treatment furnace exit feed roll descaling apparatus to which the dry ice injection method according to the first embodiment shown is spaced apart below the exit feed roll 10, the heat treatment furnace exit feed roll Dry ice spray nozzle unit 110 provided to spray dry ice particles d toward the surface of 10 to peel scale C adsorbed on the surface, and dry ice filled and stored. It consists of a configuration including a storage unit 130.

The dry ice spray nozzle unit 110 is formed in a form having a spray hole 112 formed to spray the dry ice particles in the vertical direction toward the lower surface of the exit feed roll in a heat treatment furnace.

At this time, the injection hole 112 is preferably made of a structure and a shape capable of vertically spraying the dry ice particles (d) in a width that opposes the outer peripheral surface of the exit feed roll 10 by a heat treatment.

Thereby, the scale adsorbed on the outer peripheral surface of the exit feed roll 10 by heat treatment can be effectively peeled off.

At the inlet side of the dry ice injection nozzle unit 110, a mixing chamber 120 for mixing and storing dry ice particles supplied from the dry ice storage unit 130 and compressed air provided from the air compression unit 140 is provided. It is further provided.

The mixing chamber 120 may form a pressure vessel having a predetermined capacity and mix and store the dry ice particles and compressed air introduced and mixed inward.

The dry ice storage unit 130 is a container member that fills and stores dry ice particles, and the air compression unit 140 sprays the dry ice particles at high speed through the dry ice injection nozzle unit 110. To provide compressed air to be mixed with the ice particles.

And between the mixing chamber 120 and the dry ice storage unit 130, a dry ice supply pipe 132 for supplying and transporting dry ice particles is formed.

On the dry ice supply pipe 132, it is preferable that a dry ice control valve 134 is provided to control the opening and closing of the dry ice particle flow from the dry ice storage unit 130 to the mixing chamber 120.

By controlling the opening and closing of the dry ice control valve 134, the dry ice particles stored in the dry ice storage unit 130 flows into the mixing chamber 120, and then heat-processes through the dry ice spray nozzle 110 again. It is injected to the outer peripheral surface of the exit feed roll (10). As a result, the scale adsorbed on the outer circumferential surface of the exit feed roll 10 by heat treatment can be removed.

However, the dry ice particles may be discharged toward the exit feed roll 10 by heat treatment together with high pressure and high speed air compressed at a predetermined pressure, which enables the air compression unit 140 and the mixing chamber 120. The compressed air supply pipe 142 is formed between the ().

On the compressed air supply pipe 142, the compressed air control valve 144 for opening and closing the compressed air flow from the air compressor 140 to the mixing chamber is preferably provided.

By controlling the opening and closing of the compressed air control valve 144, the flow of the compressed air flowing into the mixing chamber 120 is intermittently regulated, it can be adjusted to the pressure of the compressed air flowing.

The compressed air regulating valve 144 may use a pressure regulating valve that maintains a constant flow pressure of the compressed air.

As such, the dry ice particles supplied from the dry ice storage unit 130 are mixed with the compressed air supplied from the air compression unit 140 in the mixing chamber 120 and then heat-treated through the dry ice injection nozzle unit 110. It is sprayed on the surface of the furnace exit side feed roll 10, and peeling off the scale.

The principle of descaling by dry ice particles, i.

That is, when dry ice particles (d) accompanying high pressure compressed air collide with the scale (C) on the surface of the exit feed roll (10) by heat treatment, the dry ice particles cause the scale (C) to be extremely low temperature (e.g., -78.5 ° C). ), And the scale (C) shrinks due to the temperature difference with the ambient temperature, causing cracks.

As the dry ice particles penetrate between the scales through the cracks, the dry ice particles sublimate and expand in volume by approximately 800 times or more, and at the same time, the scales are peeled off to the upper layer.

The peeled scale is easily removed from the surface of the exit feed roll 10 by heat treatment by wind pressure.

Second Embodiment

FIG. 4 is a view schematically illustrating a device for removing a feed roll scale from a heat treatment furnace to which a dry ice injection method according to a second embodiment of the present invention is applied.

This second embodiment implements active control of the device by adding a scale detector and a controller to the configuration of the first embodiment described above.

Therefore, unnecessary duplicate description will be omitted for the same configuration as the first embodiment described above with reference to FIG. 3.

Referring to FIG. 4, the apparatus for removing a feed roll scale from a heat treatment furnace to which a dry ice spray method is applied according to a second embodiment of the present invention includes a dry ice spray nozzle unit 110, a dry ice storage unit 130, And an air compressor 140, and further comprising a scale detector 150 for monitoring the surface state of the exit feed roll by heat treatment, and a controller 160 for determining and controlling the injection pressure of the dry ice particles. Is done.

The scale detecting unit 150 is a sensing unit that monitors the surface state of the exit feed roll 10 by a heat treatment to obtain scale C state information adsorbed on the surface.

To this end, the scale detector 150 may use a laser vision sensor.

That is, the scale detector 150 irradiates the laser light L to the surface of the exit feed roll 10 by a heat treatment. And the scale state adsorbed on the surface of the exit feed roll 10 by the heat treatment by imaging the amount and distribution of the scale (C) adsorbed on the surface of the exit feed roll 10 by the heat treatment, and through the captured image information Information can be obtained.

The scale state information detected by the scale detector 150 is transmitted to the controller 160.

The controller 160 controls the spray pressure of the dry ice particles to be sprayed from the dry ice spray nozzle unit 110 using the scale state information on the surface of the exit feed roll 10 by the heat treatment detected by the scale detector 150. It plays a role of determining and controlling, and in addition, it may be made in the form of applying various commands required for scale work.

To this end, the controller 160 includes a detailed configuration including a data input unit 162 and a data operation unit 164.

The data input unit 162 plays a role of receiving scale state information obtained through the scale detecting unit 150, and a wired / wireless communication interface may be used, and a specific example may be an RS-232 communication interface. It is possible.

The data operation unit 164 is responsible for comparing the scale state information received from the data input unit 162 with a reference value and determining and controlling the injection pressure of the dry ice particles to be injected from the dry ice injection nozzle unit 110. do.

Dry ice injection pressure control by the control unit 160, through the opening and closing control of the dry ice control valve 134 on the dry ice supply pipe 132 and the compressed air control valve 144 on the compressed air supply pipe 142. It may be possible.

That is, the dry ice control valve 134 controls the flow of dry ice particles from the dry ice storage unit 130 to the mixing chamber 120 according to the command of the control unit 160.

In addition, the compressed air control valve 144 also controls the opening and closing of the compressed air flow from the air compressor 140 to the mixing chamber 120 according to the command of the control unit 160.

In particular, the compressed air control valve 144 is preferably a proportional pressure control valve capable of adjusting the pressure of the compressed air in proportion to the input current according to the command of the control unit 160.

Thereby, the dry ice injection pressure can be actively adjusted corresponding to the state degree of the scale on the surface of the exit feed roll 10 by the heat treatment furnace. As a result, it is possible to improve the quality of the thick plate (S) heat treatment products, it is possible to improve the production efficiency through an automated process.

Next, a method of removing the exit feed roll scale by a heat treatment to which a dry ice spray method is applied according to a preferred embodiment of the present invention will be described.

In the drawings, Figure 5 is a flow chart illustrating a method for removing the exit feed roll scale of the heat treatment furnace applied dry ice injection method according to an embodiment of the present invention, Figure 6 is a flow chart of the exit feed roll of the heat treatment furnace in the flow chart shown in FIG. It is a flow chart showing the detailed steps of the step (S100) of obtaining scale state information adsorbed on the surface of the.

Referring to Figure 5, first obtains the scale state information adsorbed on the surface of the exit feed roll by the heat treatment (S100).

In this step S100, a laser vision sensing detection method may be applied, which may be described with reference to FIG. 6 as a detailed step thereof.

In order to obtain scale state information adsorbed on the surface of the exit feed roll by heat treatment, first, laser light is irradiated onto the surface of the exit feed roll by heat treatment (S120).

Then, the heat treatment side feed roll surface image by the irradiated laser light is imaged to obtain scale state information after image processing (S140).

Through such steps S120 and S140, scale state information adsorbed on the surface of the exit feed roll may be obtained.

Referring back to FIG. 5, as a next step, after comparing and determining the obtained scale state information with a reference value, the injection speed and pressure of the dry ice particles are calculated (S200).

Next, according to the calculated spraying speed and pressure of the dry ice particles, the supply amount of the dry ice particles and the pressure of the compressed air to be mixed with the dry ice particles are adjusted and controlled (S300).

As a result, the scale adsorbed on the surface of the exit feed roll by the heat treatment collides with the dry ice particles injected at high speed, and thus can be effectively peeled off.

According to the apparatus and method for removing the delivery feed roll scale from the heat treatment furnace to which the present invention is applied to the dry ice injection method, the surface defect of the thick plate product is caused as the scale generated in the heavy plate product during the heat treatment is adsorbed to the exit feed roll by the heat treatment. The problem can be eliminated by using the dry ice particles sprayed directly onto the exit feed roll by heat treatment, thereby improving the quality and productivity of the thick plate product.

In addition, the dry ice particles sprayed in order to effectively remove the scale adsorbed on the exit feed roll by heat treatment instantly collide with the scale, and immediately sublimate to remove the scale, thereby adversely affecting the shape and material properties of the feed roll. Does not hurt

In the above, the apparatus and method for removing the feed roll scale from the exit side of the heat treatment furnace to which the dry ice injection method according to the present invention was applied were described.

It is to be understood that the above-described embodiments are illustrative in all aspects and should not be construed as limiting, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

S: Plates
C: scale
L: laser light
d: dry ice particles
110: dry ice spray nozzle
120: mixing chamber
130: dry ice storage unit
140: air compression unit
150: scale detection unit
160:

Claims (20)

delete delete delete delete delete delete delete delete A dry ice spray nozzle unit disposed to be spaced apart from the exit conveying roll by a heat treatment, and spraying dry ice particles toward the surface of the exit conveying roll to heat the scale to adsorb the scale adsorbed on the surface of the exit conveying roll;
A dry ice storage unit filling and storing dry ice particles;
An air compression unit provided to provide compressed air to be mixed with the dry ice particles so as to spray the high pressure dry ice particles through the dry ice injection nozzle unit;
A scale detection unit configured to monitor the surface state of the exit feed roll by heat treatment to obtain scale state information adsorbed on the surface; And
And a controller configured to determine and control an injection pressure of dry ice particles to be injected from the dry ice injection nozzle unit by using the obtained scale state information.
The scale detecting unit is a laser vision sensor that irradiates laser light to the surface of the exit feed roll by a heat treatment, and captures the exit feed roll surface image by heat treatment by the irradiated laser light to obtain scale state information after image processing. Degassing feed roll descaling apparatus with a heat treatment method characterized in that the dry ice injection method.
The method of claim 9,
The scale detector,
It is a laser vision sensor which obtains scale state information adsorbed on the surface of the exit feed roll by heat treatment by irradiating laser light to the surface of the exit feed roll by heat treatment, and imaging the amount and distribution of the adsorbed scale. Degassing feed roll descaling apparatus with a heat treatment applied dry ice spray method.
The method of claim 9,
The control unit,
A data input unit configured to receive scale state information obtained through the scale detector; And
And a data calculation unit for comparing the received scale state information with a reference value and determining and controlling the injection pressure of the dry ice particles to be injected from the dry ice injection nozzle unit. Outgoing feed roll descaling device.
The method of claim 9,
The dry ice injection nozzle unit,
Heat treatment furnace outgoing transfer roll scale removal apparatus is applied to a dry ice injection method characterized in that it comprises a spray hole formed to inject the dry ice particles in the vertical direction toward the lower surface of the exit feed roll in the heat treatment furnace.
The method of claim 9,
On the inlet side of the dry ice injection nozzle unit,
Drying chamber outgoing transfer roll descaling apparatus applied to the dry ice injection method characterized in that the mixing chamber for mixing and storing the dry ice particles supplied from the dry ice storage unit, and the compressed air provided from the air compression unit .
The method of claim 13,
Between the mixing chamber and the dry ice storage unit,
Dry ice feed scale descaling apparatus for the heat-treatment with a dry ice injection method characterized in that the dry ice supply pipe for the feed feed of dry ice particles is formed.
15. The method of claim 14,
On the dry ice supply pipe,
According to the command of the control unit, a dry ice control valve for controlling the opening and closing of the dry ice particle flow from the dry ice storage unit to the mixing chamber is provided. Device.
The method of claim 13,
Between the mixing chamber and the air compression unit,
An apparatus for removing a feed roll scale from the exit side of a heat treatment furnace to which a dry ice injection system is connected, wherein a compressed air supply pipe for supplying compressed air is connected.
17. The method of claim 16,
On the compressed air supply pipe,
In accordance with the command of the control unit, the heat transfer furnace exit feed roll scale removal apparatus is applied to a dry ice injection method, characterized in that the compressed air control valve for opening and closing the compressed air flow from the air compressor to the mixing chamber is provided.
The method of claim 17,
The compressed air control valve,
And a proportional pressure control valve capable of regulating the pressure of the compressed air in proportion to the input current according to the command of the controller.
(a) obtaining scale state information adsorbed on the surface of the exit feed roll by a heat treatment;
(b) calculating the injection speed and pressure of dry ice particles after comparing the obtained scale state information with a reference value; And
(c) controlling and controlling the supply amount of the dry ice particles and the pressure of the compressed air to be mixed with the dry ice particles according to the calculated spraying speed and pressure of the dry ice particles;
The step (a)
(a-1) irradiating laser light to the surface of the exit feed roll by a heat treatment; And
(a-2) photographing the exit feed roll surface image by the heat treatment by the irradiated laser light to obtain scale state information after the image processing; How to remove roll scale.
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