CN112246883A - Rod and wire mill cooling water control device and method - Google Patents
Rod and wire mill cooling water control device and method Download PDFInfo
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- CN112246883A CN112246883A CN202010874046.1A CN202010874046A CN112246883A CN 112246883 A CN112246883 A CN 112246883A CN 202010874046 A CN202010874046 A CN 202010874046A CN 112246883 A CN112246883 A CN 112246883A
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- water supply
- control
- flow
- cooling water
- valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B2037/002—Mass flow control
Abstract
The invention relates to a cooling water control device of a rod and wire rolling mill, which is characterized by comprising a water supply system, wherein the water supply system is provided with an outlet header pipe, a pressure transmitter and a flow circulation valve group are additionally arranged on the outlet header pipe, the outlet header pipe is communicated with the rolling mill through a branch pipeline, a quick switch valve, a flow regulating valve and a manual switch valve are arranged on the branch pipeline, the three valves are sequentially connected in series and are respectively and electrically connected with an electrical control system, the electrical control system is electrically connected with a PLC, and the PLC is provided with an operation interface. The automatic regulation and automatic control of the cooling water quantity of the single-stand rolling mill are realized, the special cooling process requirements of high-quality special rod wires are met, the constant pressure control of the outlet header pipe is realized, and the accurate control of the cooling water quantity required by each rolling mill is ensured.
Description
Technical Field
The invention relates to the technical field of rod and wire rolling mill equipment, in particular to a cooling water control method of a rod and wire rolling mill.
Background
The bar and wire rolling mill is used for rolling the heated steel billet into various bar and wire products required by users. The material of the rod and wire mill roller is generally infinite chilled cast iron or alloy forged steel, the roller is directly contacted with red steel, micro-hot cracks are easily generated, and iron scale particles generated by rolling easily enter the micro-cracks to cause the cracks to expand. The roller cooling water is arranged: firstly, the roller is cooled to reduce the temperature, so that the generation of micro cracks is reduced; secondly, the iron oxide scale particles are washed away, and the expansion of microcracks is avoided. In addition, the friction coefficient of the new roller is low in a cold state, and because the cooling water of the roller has a certain lubricating effect, the steel biting of the rolling mill is easy to happen without accidents. In addition, for a super-fine bar production line, the head of some special steel types is cracked when being sprayed with cold water, so that the steel biting is difficult and the yield is reduced, and the cooling water of the roller is started after the steel biting is required by the rolling process.
Referring to fig. 1, fig. 1 is a control structure diagram of cooling water of a conventional metallurgical bar and wire rolling mill, and the functions of the equipment are as follows:
(1) the rod and wire rolling mill is divided into regions of rough rolling, intermediate rolling (first or second) and finish rolling according to functions, each region is provided with a region control main valve and a bleeding valve, and the region control main valve and the bleeding valve are generally controlled electrically or pneumatically.
(2) And a manual regulating valve is arranged beside each rolling mill, and before starting, an operator manually regulates the cooling water quantity required by the rolling mill according to the requirements of the rolling process.
(3) The water supply system comprises a pump set, a motor, an inlet and outlet valve, a filtering device, pressure, temperature, vibration and other detection instruments, and the pump set works at a constant rotating speed.
(4) The electric control system comprises a primary on-site detection instrument (such as vibration, temperature and flow detection), an execution element, a PLC process control system and an L1 and L2 level data communication system, and the control of equipment valves such as a water supply system, a bleeding valve and a regional control main valve is realized.
2. The control method comprises the following steps:
the pump set of the water supply system operates at constant rotating speed and constant flow, and the pressure of the outlet main pipe changes along with the change of the number of the used rolling mills. During normal production, the control main valves of all the areas are opened or closed according to the process requirements, the bleeding valves of all the areas are closed or opened according to the process requirements, and the cooling water quantity required by each rolling mill is manually adjusted by an operator before starting the rolling mill.
When a certain rolling mill in a certain area is not put into use, the pressure of the outlet main pipe is increased; when all rolling mills in a certain area are not put into use, the bleeding valve of the area is opened for bleeding.
When the rolling line is stopped for a long time (for overhauling or changing rolls and grooves), the water supply pump set is stopped after a period of time delay, the main control valve of each area is closed, and the blow-off valve of each area is opened.
When a certain rolling mill in a certain area is abnormal and needs short-time shutdown inspection, the main valve of the area is closed, the bleeding valve of the area is opened, and the manual regulating valve of the rolling mill needing inspection is closed.
3. The problems that exist are that:
(1) and the cooling water of each rolling mill needs to be manually adjusted by an operator before starting the rolling mill each time, so that the labor intensity is high, and the automation degree is low.
(2) The pressure fluctuation of the outlet header pipe is large, the pressure impact has certain influence on the service life of equipment and a pipe network, and simultaneously, the cooling water flow of each rolling mill has fluctuation and influences the cooling effect due to the pressure fluctuation.
(3) And the diffusion of the diffusion valve causes the waste of cooling water and electric resources.
(4) And the cooling process requirement of high-quality special steel grades cannot be met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a rod and wire mill cooling water control device and method, which can realize automatic adjustment and automatic control of the cooling water quantity of a single-stand mill, meet the special cooling process requirements of high-quality special rods and wires, realize constant pressure control of an outlet header pipe and ensure accurate control of the cooling water quantity required by each mill.
The technical purpose of the invention is realized by the following technical scheme: a cooling water control device for a bar and wire rolling mill comprises a water supply system, wherein the water supply system is provided with an outlet header pipe, a pressure transmitter and a flow circulation valve group are additionally arranged on the outlet header pipe, the outlet header pipe is communicated with the rolling mill through a branch pipe, a quick switch valve, a flow regulating valve and a manual switch valve are arranged on the branch pipe, the three valves are sequentially connected in series and are respectively and electrically connected with an electrical control system, the electrical control system is electrically connected with a PLC, and the PLC is provided with an operation interface;
during normal production, the quick switch valve is in an opening or closing state according to the process control requirement, the flow control valve is in a corresponding opening degree according to a preset flow valve core, the manual switch valve is in an opening state, and the flow control valve automatically adjusts the opening degree according to the rolling process requirement to control the flow of cooling water.
In one embodiment, the pressure transmitter is provided with pressure set points including a SP1 low pressure set point, a SP2 high pressure set point; realize the constant pressure control of the water supply system.
In one embodiment, the flow circulation valve group comprises a circulation valve and a throttle orifice, when the rolling line needs to be stopped and stopped or checked for a short time, the quick switching valves of all branch pipelines are in a closed state, in order to prevent the water supply pump from overheating, the small flow circulation valve group is automatically opened, and the water supply system is in a small flow internal circulation state.
In one embodiment, the quick opening and closing valve is required to ensure that the roller cooling water valve can be opened quickly after the rolling mill bites steel, and the opening and closing time of the quick opening and closing valve is required to be controlled within 1 s.
In one embodiment, the flow regulating valve automatically regulates the flow of the cooling water according to the requirements of the rolling process, and the rolling mill automatically sets and regulates the opening degree of the flow regulating valve according to the requirements of the rolling process before rolling.
In one embodiment, the water supply system is electrically connected with the electrical control system.
In one embodiment, the water supply system further comprises a water supply pump set, the water supply pump set is electrically connected with a water pump motor, and the water pump motor is electrically connected with a frequency converter.
In one embodiment, the electrical control system is further electrically connected to a field test instrument, which includes a vibration test instrument, a temperature test instrument, a pressure test instrument, and a flow test instrument.
The invention also comprises a rod and wire mill cooling water control method, which specifically comprises the following steps:
the constant pressure control of the water supply system is carried out by presetting a low pressure set value and a high pressure set value of a pressure transmitter on the outlet of a main pipe according to the production process requirement and sending the preset values to a PLC system of a water supply pump set; the PLC system of the water supply pump set can control the rotating speed of the water pump driving motor by controlling the frequency converter; when the pressure of the outlet main pipe is lower than the low-pressure set value, the water supply pump set can automatically accelerate, and when the pressure of the outlet main pipe is higher than the high-pressure set value, the water supply pump set can automatically decelerate, so that the outlet pressure of the outlet main pipe is controlled between the low-pressure set value and the high-pressure set value, and the constant pressure control is realized;
for the flow regulation of the branch pipelines, the set values of all the flow regulating valves are set on an operation interface according to the requirements of the rolling process or the set values are automatically downloaded by a control system, and the PLC control system controls the opening degree of the flow regulating valves according to instructions so as to realize the flow required by the target requirements.
In one embodiment, the method further comprises the following steps: firstly, starting a water supply pump set, opening a circulating valve group, and operating the water supply pump set at a low speed and a small flow; then, presetting the flow of each branch pipeline; then, the fast switch valve of each branch pipeline is automatically opened or closed according to the control instruction of the PLC; and finally, the water supply system realizes constant pressure control.
In conclusion, the invention has the following beneficial effects:
firstly, constant pressure control of an outlet main pipe is realized, and accurate control of the cooling water quantity required by each rolling mill is ensured;
secondly, the automatic adjustment and automatic control of the cooling water quantity of the single-stand rolling mill are realized, and the special cooling process requirements of high-quality special rods and wires are met;
thirdly, after the wire rod cooling device is put into use, the labor intensity of operation and maintenance personnel is reduced, the special cooling process requirements of high-quality special rod and wire rods are met, the waste of production water and electricity is reduced, the accurate control of the cooling water quantity required by each rolling mill is guaranteed, and better social and economic benefits are achieved.
Drawings
FIG. 1 is a control structure diagram of cooling water of a conventional metallurgical bar and wire mill;
fig. 2 is a schematic diagram of the control structure of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
Example (b):
referring to fig. 2, a method for controlling cooling water of a rod and wire mill mainly comprises the following steps: the water supply system P01, the water supply system P01 is connected with a water outlet main pipe, a circulation valve group X01 is arranged on the water outlet main pipe, the circulation valve group X01 comprises 1 circulation valve and 1 group of orifice plates, when the rolling line needs to be stopped and stopped or checked for a short time, the quick switch valves of all branch pipelines are in a closed state, in order to prevent the water supply pump from overheating, the small-flow circulation valve group is automatically opened, and the water supply system is in a small-flow internal circulation state; the water outlet header pipe is respectively communicated with a rolling mill cooling water header Z01, a rolling mill cooling water header Z02 and a rolling mill cooling water header Z0; wherein a branch pipeline between the water outlet header pipe and the rolling mill cooling water header pipe Z01 is sequentially provided with a quick switch valve F0101, a flow regulating valve F0201 and a manual switch valve F0301 which are connected in series; a branch pipeline between the water outlet header pipe and the rolling mill cooling water header pipe Z02 is sequentially provided with a quick switch valve F0102, a flow regulating valve F0202 and a manual switch valve F0302 which are connected in series; a quick switch valve F010, a flow regulating valve F020 and a manual switch valve F030 which are connected in series are sequentially arranged on a branch pipeline between the water outlet header pipe and the rolling mill cooling water header pipe Z0; during normal production, the quick switch valve is in an opening or closing state according to the process control requirement, each flow control valve is in a corresponding opening degree according to a preset flow valve core, and each manual switch valve is in an opening state. For preventing that the rolling mill from drenching and skidding because of the cooling water when stinging the steel, require the rolled piece to sting the back and just can start rolling mill cooling water, quick switch valve's effect is: the cooling water valve of the roller can be quickly opened after the rolling mill bites steel, and the opening and closing time of the cooling water valve is required to be controlled within 1 s. The flow regulating valve automatically regulates the flow of cooling water according to the requirements of the rolling process, generally, before rolling, the rolling mill is provided with two-stage data communication systems of L1 and L2, and the opening degree of the flow regulating valve is automatically set and regulated according to the requirements of the rolling process through the two-stage data communication systems. The manual switch valve is used for closing when the production is stopped for maintenance, so that the maintenance safety is ensured. The automatic adjustment and automatic control of the cooling water quantity of each rolling mill are realized, and the special cooling process requirements of high-quality special rods and wires are met.
Water supply system P01 adopts frequency conversion control, water supply system is including water supply pump package and export house steward, and wherein water supply pump package electric connection has the water pump motor, and water pump motor electric connection has the converter, sets up pressure transmitter on the house steward of export, and pressure transmitter is provided with SP1 low pressure setting value, SP2 high pressure setting value, and production operating personnel predetermines 2 pressure setting values of pressure transmitter on the house steward export according to the production technology requirement: if the SP1 low pressure set value is 8.5bar, and the SP2 high pressure set value is 9bar, the signals are sent to the PLC system of the water supply pump group. The PLC system of the water supply pump set can control the rotating speed of the water pump driving motor through an internal control program. When the pressure of the outlet main pipe is lower than 8.5bar, the water supply pump set can automatically accelerate, and when the pressure of the outlet main pipe is higher than 9bar, the water supply pump set can automatically decelerate, so that the outlet pressure of the outlet main pipe is controlled to be between 8.5bar and 9bar, and the constant pressure control is realized.
The water supply system P01 is electrically connected with an electrical control system K01, and the electrical control system K01 comprises a field detection primary instrument (such as vibration, temperature, pressure and flow detection), an actuating element, a PLC control system and a data communication network of an L2 level control system of the production process, so that the control of related equipment valves of the water supply system, the circulating valve bank, the quick switch valve and the flow regulating valve is realized.
The control operation process is as follows:
starting a water supply pump set, opening a circulating valve group, and operating the water supply pump set at a low speed and a small flow; presetting the flow of each branch pipeline; the fast switch valve of each branch pipeline is automatically opened or closed according to the control instruction of the PLC; and fourthly, realizing constant pressure control of the water supply system.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A cooling water control device of a rod and wire rolling mill is characterized by comprising a water supply system, wherein the water supply system is provided with an outlet header pipe, a pressure transmitter and a flow circulation valve group are additionally arranged on the outlet header pipe, the outlet header pipe is communicated with the rolling mill through a branch pipeline, a quick switch valve, a flow regulating valve and a manual switch valve are arranged on the branch pipeline, the three valves are sequentially connected in series and are respectively and electrically connected with an electrical control system, the electrical control system is electrically connected with a PLC, and the PLC is provided with an operation interface;
during normal production, the quick switch valve is in an opening or closing state according to the process control requirement, the flow control valve is in a corresponding opening degree according to a preset flow valve core, the manual switch valve is in an opening state, and the flow control valve automatically adjusts the opening degree according to the rolling process requirement to control the flow of cooling water.
2. The rod and wire mill cooling water control apparatus of claim 1, wherein said pressure transmitter is provided with pressure settings including a SP1 low pressure setting, a SP2 high pressure setting; realize the constant pressure control of the water supply system.
3. The rod and wire mill cooling water control device according to claim 1 or 2, wherein the flow circulation valve group comprises a circulation valve and a throttle orifice, when the rolling line needs to be stopped for a short time or stopped for production or checked, the quick opening and closing valves of all branch pipelines are in a closed state, and in order to prevent the water supply pump from overheating, the small flow circulation valve group is automatically opened, and the water supply system is in a small flow internal circulation state.
4. The cooling water control device for the rod and wire mill according to claim 1, wherein the quick opening and closing valve is required to ensure that the roller cooling water valve can be opened quickly after the rolling mill bites steel, and the opening and closing time is required to be controlled within 1 s.
5. The rod and wire mill cooling water control device according to claim 1, wherein the flow control valve automatically adjusts the flow rate of the cooling water according to the rolling process requirements, and before rolling, the rolling mill automatically sets the opening degree of the flow control valve according to the rolling process requirements.
6. The rod and wire mill cooling water control apparatus of claim 1 wherein the water supply system is electrically connected to an electrical control system.
7. The rod and wire mill cooling water control device of claim 1, wherein the water supply system further comprises a water supply pump set, the water supply pump set is electrically connected with a water pump motor, and the water pump motor is electrically connected with a frequency converter.
8. The rod and wire mill cooling water control apparatus as claimed in any one of claims 4 to 7, wherein said electrical control system is further electrically connected to on-site instrumentation, including vibration instrumentation, temperature instrumentation, pressure instrumentation and flow instrumentation.
9. A cooling water control method for a rod and wire rolling mill is characterized by comprising the following steps:
according to the constant pressure control of the water supply system, a low pressure set value and a high pressure set value of a pressure transmitter on an outlet of a main pipe are preset according to the production process requirement and are sent to a PLC system of a water supply pump set arranged at the water supply system, and the PLC system of the water supply pump set can control the rotating speed of a water pump driving motor through a control frequency converter; when the pressure of the outlet main pipe is lower than the low-pressure set value, the water supply pump set can automatically accelerate, and when the pressure of the outlet main pipe is higher than the high-pressure set value, the water supply pump set can automatically decelerate, so that the outlet pressure of the outlet main pipe is controlled between the low-pressure set value and the high-pressure set value, and the constant pressure control is realized;
for the flow regulation of the branch pipelines, the set values of all the flow regulating valves are set on an operation interface according to the requirements of the rolling process or the set values are automatically downloaded by a control system according to a production system, and a PLC control system controls the opening degree of the flow regulating valves according to instructions so as to realize the flow required by the target requirements.
10. The rod and wire mill cooling water control method of claim 8, further comprising: firstly, starting a water supply pump set, opening a circulating valve group, and operating the water supply pump set at a low speed and a small flow; then, presetting the flow of each branch pipeline; then, the fast switch valve of each branch pipeline is automatically opened or closed according to the control instruction of the PLC; and finally, the water supply system realizes constant pressure control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874046.1A CN112246883A (en) | 2020-08-26 | 2020-08-26 | Rod and wire mill cooling water control device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010874046.1A CN112246883A (en) | 2020-08-26 | 2020-08-26 | Rod and wire mill cooling water control device and method |
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| CN112246883A true CN112246883A (en) | 2021-01-22 |
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| CN202010874046.1A Pending CN112246883A (en) | 2020-08-26 | 2020-08-26 | Rod and wire mill cooling water control device and method |
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| CN1404933A (en) * | 2001-09-20 | 2003-03-26 | 长沙矿山研究院 | High-pressure water thermal-state descaling system of electro-hydraulic control unloading valve |
| CN101463824A (en) * | 2008-12-29 | 2009-06-24 | 中冶南方工程技术有限公司 | Design method for independent water supply and spill of hot-rolling high-pressure water pump station |
| CN101879531A (en) * | 2010-05-31 | 2010-11-10 | 北京科技大学 | Hot rolled strip laminar cooling device capable of controlling cooled strip shape |
| BRPI1100218A2 (en) * | 2010-02-17 | 2012-07-31 | Nippon Steel Corp | Flow rate control valve and cooling device using same |
| CN203197017U (en) * | 2013-03-29 | 2013-09-18 | 中冶南方工程技术有限公司 | Water supply and water return system of bar water-cooling device |
| CN103861879A (en) * | 2014-03-28 | 2014-06-18 | 东北大学 | Online cooling device and control method for moderate-thickness plate |
| CN105834218A (en) * | 2015-01-16 | 2016-08-10 | 宝山钢铁股份有限公司 | Warm-rolling working roll and control method of internal and external temperature field |
| CN208019159U (en) * | 2018-03-21 | 2018-10-30 | 沈阳欧能科技有限公司 | It is a kind of flux controllable for water cooling system |
-
2020
- 2020-08-26 CN CN202010874046.1A patent/CN112246883A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1404933A (en) * | 2001-09-20 | 2003-03-26 | 长沙矿山研究院 | High-pressure water thermal-state descaling system of electro-hydraulic control unloading valve |
| CN101463824A (en) * | 2008-12-29 | 2009-06-24 | 中冶南方工程技术有限公司 | Design method for independent water supply and spill of hot-rolling high-pressure water pump station |
| BRPI1100218A2 (en) * | 2010-02-17 | 2012-07-31 | Nippon Steel Corp | Flow rate control valve and cooling device using same |
| CN101879531A (en) * | 2010-05-31 | 2010-11-10 | 北京科技大学 | Hot rolled strip laminar cooling device capable of controlling cooled strip shape |
| CN203197017U (en) * | 2013-03-29 | 2013-09-18 | 中冶南方工程技术有限公司 | Water supply and water return system of bar water-cooling device |
| CN103861879A (en) * | 2014-03-28 | 2014-06-18 | 东北大学 | Online cooling device and control method for moderate-thickness plate |
| CN105834218A (en) * | 2015-01-16 | 2016-08-10 | 宝山钢铁股份有限公司 | Warm-rolling working roll and control method of internal and external temperature field |
| CN208019159U (en) * | 2018-03-21 | 2018-10-30 | 沈阳欧能科技有限公司 | It is a kind of flux controllable for water cooling system |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: MABA Shaogang, Qujiang District, Shaoguan City, Guangdong Province Applicant after: Baowu jiefuyi Special Steel Co.,Ltd. Address before: MABA Shaogang, Qujiang District, Shaoguan City, Guangdong Province Applicant before: BAOSTEEL SPECIAL STEEL SHAOGUAN Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20210122 |