CN107008875B - Device for realizing double operation modes of billet continuous casting machine - Google Patents
Device for realizing double operation modes of billet continuous casting machine Download PDFInfo
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- CN107008875B CN107008875B CN201710237302.4A CN201710237302A CN107008875B CN 107008875 B CN107008875 B CN 107008875B CN 201710237302 A CN201710237302 A CN 201710237302A CN 107008875 B CN107008875 B CN 107008875B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
Abstract
A method for realizing double operation modes of a billet continuous casting machine is characterized in that a plurality of throwing racks and a knockout rack are sequentially arranged in each flow of the billet continuous casting machine along the casting direction, an upper press roller and a lower press roller are arranged on each throwing rack and each knockout rack, each upper press roller is connected with a corresponding hydraulic cylinder and a corresponding hydraulic control system, the hydraulic control system of each throwing rack comprises a soft-pressing hydraulic unit, the hydraulic control systems of part of the throwing racks are also provided with conventional hydraulic units, and in a common mode, each conventional hydraulic unit controls the corresponding throwing rack to participate in the production of common steel; under the soft reduction mode, each soft reduction hydraulic unit controls the throwing rack to participate in the production of various steels. According to the invention, the hydraulic control system with the soft reduction hydraulic unit and the conventional hydraulic unit is arranged in each flow of the billet continuous casting machine, and the two hydraulic units can be switched according to the types of products, so that the equipment utilization rate is greatly improved, and the maximization of enterprise benefits is realized.
Description
Technical Field
The invention relates to a method for producing common steel and variety steel by utilizing a billet continuous casting machine, belonging to the technical field of continuous casting.
Background
The withdrawal and straightening machine is the core equipment of a small billet continuous casting machine, and the withdrawal and straightening hydraulic system is the core of the withdrawal and straightening machine. The conventional straightening and withdrawing hydraulic system has few faults and stable system operation, has the advantages of high straightening and withdrawing speed, high yield and the like, and has obvious advantages in the aspect of producing common steel grades.
With the development of variety steel on billet continuous casting machines, new requirements are put forward on the processing quality of the billet continuous casting machines. The withdrawal and straightening machine is required to have a dynamic soft reduction function when producing high-quality steel, wherein the soft reduction means that the solidification shrinkage of a casting blank is compensated by rotating pressure near the tail end of a liquid core of the continuous casting blank to generate a certain reduction, so that on one hand, internal gaps formed by the shrinkage of the casting blank can be eliminated or reduced, and molten steel with solute elements enriched in crystal boundaries is prevented from transversely flowing to the center of the casting blank; on the other hand, the extrusion effect generated by the soft reduction can also promote the solute element molten steel enriched in the center of the liquid core to reversely flow along the drawing direction, so that the solute element is redistributed in the molten steel, the casting blank is solidified more uniformly and compactly, and the effects of improving center segregation and reducing center porosity are achieved. The hydraulic system of the tension leveler with the dynamic soft pressing function is complex, high in failure rate and difficult to maintain. The withdrawal and straightening machine is relatively slow in withdrawal speed due to the existence of process control (accurate measurement of the solidification tail end and automatic and rapid roll gap adjustment) in a light-pressure state.
Due to the change of market demands, common steel needs to be produced quickly sometimes, high-quality variety steel needs to be produced sometimes, in order to improve the utilization rate of equipment and achieve the maximization of enterprise benefits, the design of a billet continuous casting machine with two operation modes of producing common steel and variety steel has important significance.
Disclosure of Invention
The invention aims to provide a device for realizing double operation modes of a billet continuous casting machine aiming at the defects of the prior art so as to improve the utilization rate of equipment and realize the maximization of enterprise benefits.
The problem of the invention is realized by the following technical scheme:
a device for realizing double operation modes of a billet continuous casting machine is characterized in that a plurality of densely arranged drawing frames and a stripping frame are sequentially arranged in each flow of the billet continuous casting machine along the casting direction, an upper compression roller and a lower compression roller are arranged on each drawing frame and each stripping frame, each upper compression roller is connected with a corresponding hydraulic cylinder and a corresponding hydraulic control system, the hydraulic control system of each drawing frame comprises a soft-reduction hydraulic unit, the hydraulic control systems of part of the drawing frames are also provided with conventional hydraulic units, and in a common mode, each conventional hydraulic unit controls the corresponding drawing frame to participate in the production of common steel; under the mode of soft reduction, each soft reduction hydraulic unit 25 controls the throwing rack to participate in the production of various steels.
In the device for realizing the double operation modes of the billet continuous casting machine, the soft reduction hydraulic unit 25 comprises a mode selection reversing valve 20, a hydraulic control one-way valve 21, a servo valve 22 and a double hydraulic control one-way valve 23, a port P of the servo valve 22 is connected with system pressure oil through the hydraulic control one-way valve 21, a port T is connected with an oil tank, and a port A and a port B are respectively connected with a front cavity and a rear cavity of the billet drawing hydraulic cylinder 8 of the corresponding billet drawing frame through the double hydraulic control one-way valve 23; the P port of the mode selection reversing valve 20 is connected with system pressure oil, the T port is connected with a control oil pipe, and the A port and the B port control the opening and closing of the hydraulic control one-way valve 21 and the double hydraulic control one-way valve 23.
According to the device for realizing the double operation modes of the billet continuous casting machine, the conventional hydraulic unit 26 comprises a low-pressure reducing valve 15, a pressure selection reversing valve 16, a blank-drawing up-down selection reversing valve 17 and a double hydraulic control one-way valve 19, the low-pressure reducing valve 15 reduces the system pressure to be low and then sends the low pressure to the P port of the pressure selection reversing valve 16, the T port of the pressure selection reversing valve 16 is connected with a high-pressure oil pipe, the A port is connected with the P port of the blank-drawing up-down selection reversing valve 17, the T port of the blank-drawing up-down selection reversing valve 17 is connected with an oil tank, and the A port and the B port are respectively connected with the front cavity and the rear cavity of the hydraulic cylinder of the corresponding blank-drawing rack through the double hydraulic control one-way valve 19.
The device for realizing the double operation modes of the billet continuous casting machine comprises a hydraulic control system of a knockout frame, a hydraulic control system of a knockout frame and a control system of a billet continuous casting machine, wherein the hydraulic control system comprises a low-pressure overflow valve 31, a high-pressure overflow valve 30, a pressure selection valve 29, a knockout pressure reducing valve 28 and a knockout up-down selection reversing valve 27, the knockout pressure reducing valve 28 reduces the system pressure to high pressure and then sends the high pressure to a port P and a control oil pipe of the knockout up-down selection reversing valve 27, the port P of the pressure selection valve 29 is connected with a control oil port of the knockout pressure reducing valve 28, the port T is connected with the control oil pipe, a port A of the pressure selection valve 29 is connected with an oil inlet of the low-pressure overflow valve 31 and an oil outlet of the high-pressure overflow valve 30, and a port B is connected with an oil outlet of the low-pressure overflow valve 31 and an oil inlet of the high-pressure overflow valve 30; the T port of the upper and lower blank-removing selective reversing valve 27 is connected with an oil tank, and the A port and the B port are respectively connected with the rear cavity and the front cavity of the hydraulic cylinder of the blank-removing frame 11.
Above-mentioned realize two operational mode's of billet caster device, every flow of billet caster all is equipped with a pressure regulating unit 7, pressure regulating unit 7 includes high pressure relief valve 13 and manometer 14, high pressure relief valve 13 sends into conventional hydraulic unit 26's high pressure oil pipe after reducing system's pressure to high pressure, manometer 14 connects the output at high pressure relief valve 13.
In the device for realizing the double operation modes of the billet continuous casting machine, the output end of the low-pressure reducing valve 15 is provided with the billet drawing energy accumulator 18; the output end of the knockout reducing valve 28 is provided with a knockout energy accumulator 32.
According to the device for realizing the double-operation mode of the billet continuous casting machine, the front cavity of the drawing hydraulic cylinder 8 is provided with the protective overflow valve 24.
According to the device for realizing the double-operation mode of the billet continuous casting machine, the number of the blank drawing frames in each flow of the billet continuous casting machine is six, and the blank drawing frames provided with the conventional hydraulic units in the hydraulic control system are the first, second, fourth and sixth blank drawing frames.
In the device for realizing the double operation modes of the billet continuous casting machine, the throwing energy accumulator 18 and the cogging energy accumulator 32 are both leather bag type energy accumulators.
In the invention, the hydraulic control system of the throwing rack with the soft reduction hydraulic unit and the conventional hydraulic unit is arranged in each flow of the billet continuous casting machine, and the two hydraulic units can be switched according to the types of products, so that the equipment utilization rate is greatly improved, and the maximization of enterprise benefit is realized.
Drawings
FIG. 1 is a schematic block diagram of a billet caster hydraulic system;
FIG. 2 is a hydraulic schematic of the pressure regulating unit;
FIG. 3 is a hydraulic control system for the first, second, fourth and sixth drawing frames;
FIG. 4 is a hydraulic control system for the third and fifth drawing frames;
figure 5 is a drawing of the connection of the withdrawal and straightening hydraulic cylinder and the knockout hydraulic cylinder to the withdrawal and straightening frame.
The figures are labeled as follows: 1-6 parts of first to sixth throwing racks, 7 parts of a pressure regulating unit, 8 parts of a throwing hydraulic cylinder, 9 parts of a hydraulic control system, 10 parts of an upper press roller, 11 parts of a throwing rack, 12 parts of a throwing hydraulic cylinder, 13 parts of a high-pressure reducing valve, 14 parts of a pressure gauge, 15 parts of a low-pressure reducing valve, 16 parts of a pressure selection reversing valve, 17 parts of a throwing up and down selection reversing valve, 18 parts of a throwing energy accumulator, 19 parts of a double-hydraulic control one-way valve, 20 parts of a mode selection reversing valve, 21 parts of a hydraulic control one-way valve, 22 parts of a servo valve, 23 parts of a double-hydraulic control one-way valve, 24 parts of a protection overflow valve, 25 parts of a soft-pressing hydraulic unit, 26 parts of a conventional hydraulic unit, 27 parts of a throwing up and down selection reversing valve, 28 parts of a throwing reducing valve, 29 parts of a pressure selecting valve, 30 parts of a high-pressure overflow valve, 31 parts of a low-pressure overflow valve, 32 parts of a throwing energy accumulator.
Detailed Description
The invention will be further explained with reference to the drawings.
The invention provides a withdrawal and straightening hydraulic system of a continuous casting machine, which can conveniently and quickly produce common steel and high-quality steel, wherein each flow of a small square billet continuous casting machine is provided with six throwing racks (namely a first throwing rack 1-a sixth throwing rack 6) and a stripping rack 11, the six throwing racks are densely distributed and have a soft-pressing function (namely are provided with soft-pressing hydraulic units), the hydraulic control systems of the first, second, fourth and sixth throwing racks are provided with conventional hydraulic units, each rack is provided with an upper pressing roller and a lower pressing roller, the upper pressing roller is connected with a hydraulic cylinder (the upper pressing roller of the throwing rack is connected with a throwing hydraulic cylinder 8, the upper pressing roller of the stripping rack is connected with a throwing hydraulic cylinder 12), the hydraulic cylinder of each rack is provided with a corresponding hydraulic control system 9, and each flow of the six throwing racks is provided with a shared pressure regulating unit 7.
When producing common steel, the piston rods of the hydraulic cylinders of the first, second, fourth and sixth drawing frames drive the corresponding upper press rolls to move upwards through the switching of the common mode, so that the upper press rolls are positioned at a high position and do not participate in the drawing production, only the drawing rolls of the third and fifth drawing frames are left to participate in the production, when producing various steels, the drawing rolls of the first to sixth drawing frames all participate in the production by switching to the soft pressing mode, and the required roll gap size is achieved through the control of a servo valve of a hydraulic system, so that the expected pressing amount is realized. The purpose of improving the quality of the billet of the small square billet steel is achieved.
The pressure regulating unit and all hydraulic cylinder hydraulic control systems are installed in the hydraulic station, and the throwing energy accumulator 18 and the cogging energy accumulator 32 are all leather bag type energy accumulators, so that the functions of energy storage, pressure maintaining and servo valve response speed improvement are achieved. In the pressure regulating unit shown in fig. 2, the system pressure is P (10 MPa), the high pressure reducing valve 13 reduces the system pressure to PD (high pressure 6MPa), and in the hydraulic control system of the first, second, fourth and sixth drawing frames shown in fig. 3, the low pressure reducing valve 15 reduces the system pressure P (10 MPa) to low pressure (3 MPa), corresponding to the production of ordinary steel grades and the production of high-quality steel grades.
The working principle of the invention is as follows:
1. common mode
Referring to fig. 3, in the hydraulic control system of the first, second, fourth and sixth drawing frames, 3DT is de-energized, the mode selection reversing valve 20 is in the right position, the hydraulic control check valve 21 and the double hydraulic control check valve 23 are locked, the hydraulic unit 25 is disconnected from the drawing hydraulic cylinder 8 through the double hydraulic control check valve 23 under the light pressure, 1DT is de-energized, 2DT is energized, the pressure selection reversing valve 16 is in the left position, the system is in a high-pressure (6 MPa) state, 4DT is energized, 5DT is de-energized, the drawing up-down selection reversing valve 17 is in the right position, and the hydraulic cylinder piston rods of the first, second, fourth and sixth drawing frames carry the press roll 10 to move upwards so that the drawing machine is in the high position.
Referring to fig. 4, in the hydraulic control system of the third and fifth throwing racks, 3DT is powered on, the mode selection reversing valve 20 is in the left position, the servo valve 22 enables the piston rods of the throwing hydraulic cylinders 8 of the third and fifth throwing racks to pull up the upper carrier roller under the action of an electric control signal, so that the upper carrier roller on the third and fifth throwing racks is in the high position, then 3DT is powered off, the mode selection reversing valve 20 is in the right position, the hydraulic control one-way valve 21 and the double hydraulic control one-way valve 23 are locked, and therefore the hydraulic servo system of the third and fifth throwing racks is in the high position self-locking state.
Referring to fig. 5, 7DT is electrified, a pressure selection valve 29 is positioned at the upper position, a high-pressure overflow valve 30 works, the pressure of a hydraulic system is in a high-pressure (6 MPa) state after a blank-removing pressure reducing valve 28 reduces the system pressure (10 MPa), 8DT is electrified, a blank-removing upper-lower selection reversing valve 27 is positioned at the left position, and a blank-removing upper roller is lifted. This makes the dummy ingot feeding preparation.
And (3) feeding the dummy bar into the straightening and withdrawal rack, when a dummy bar head of the dummy bar enters a space between an upper roller and a lower roller of a sixth blanking rack, enabling 5DT to be powered on, disabling 4DT to be powered off, enabling an upper and a lower selective reversing valves 17 of the blanking to be in a left position, enabling a blanking hydraulic cylinder 8 of the sixth blanking rack to be pressed down, sequentially pressing down the blanking hydraulic cylinders of the fourth, the second and the first blanking racks when the dummy bar enters a space between an upper roller and a lower roller of the fourth, the second and the first blanking racks along with the entry of the dummy bar, and feeding the dummy bar into the crystallizer, so that the preparation work of the steel drawing under the common mode is ready.
When steel drawing is started, when a dummy bar head draws a steel billet and enters a pressing-down interval of a stripping roller, 9DT is electrified, 8DT is deenergized, a reversing valve 27 is selected from the upper part and the lower part of the stripping roller to be on the right position, the steel billet and the dummy bar head are separated by pressing the stripping roller, 7DT is deenergized at the same time, a low-pressure overflow valve 31 works, and a stripping hydraulic cylinder is in a low-pressure (3 MPa) state. The 2DT loses power, the 1DT gets power, the pressure selection reversing valve 16 is arranged at the right position, and the hydraulic cylinders of the first, second, fourth and sixth throwing racks are also in a low-pressure (3 MPa) state until the steel throwing is finished.
2. Light press mode
In the hydraulic control systems of the first, second, fourth and sixth throwing racks, 4DT is de-energized, 5DT is also de-energized, the upper and lower throwing selective reversing valves 17 are in the middle position, the double hydraulic control one-way valve 19 is locked, the double hydraulic control one-way valve 19 disconnects the conventional hydraulic unit 26 from the throwing hydraulic cylinder 8, 3DT is energized simultaneously, the mode selective reversing valve 20 is in the left position, the hydraulic control one-way valve 21 and the double hydraulic control one-way valve 23 are unlocked, the hydraulic unit 25 is switched on under light pressure and the throwing hydraulic cylinder 8, the 3DT is energized simultaneously in the hydraulic control systems of the third and fifth throwing racks, the hydraulic control one-way valve 21 and the double hydraulic control one-way valve 23 are unlocked, and the hydraulic unit 25 is switched on under light pressure and the hydraulic cylinder of the third and fifth throwing racks.
Referring to fig. 5, when the dummy ingot is fed, the pressure selection valve 29 is at the upper position, the high-pressure overflow valve 30 works, the pressure of the hydraulic system is in a high-pressure (6 MPa) state after the pressure of the stripping pressure reducing valve 28 is reduced to the system pressure (10 MPa), 8DT is electrified, 9DT is electrified, the stripping upper and lower selection reversing valve 27 is at the left position, and the stripping upper roller is lifted. And when the dummy bar head of the dummy bar enters between the upper roller and the lower roller of the frame, the electric signal of the corresponding frame acts on the corresponding servo valve, so that the blank drawing hydraulic cylinder 8 of the frame drives the upper press roller to press down. This completes the operation of feeding the dummy ingot.
When steel drawing is started, when a dummy bar head draws a steel billet and enters a pressing-down interval of a stripping roller, 9DT is electrified, 8DT is unpowered, a stripping up-down selection reversing valve 27 is on the right position, the steel billet and the dummy bar head are separated under the pressing of an upper pressing roller of a stripping frame, 7DT is electrified, a pressure selection valve 29 is on the lower position, a low-pressure overflow valve 31 works, and a stripping hydraulic cylinder is in a low-pressure (3 MPa) state. And under a soft reduction mode, according to roll gap process parameters corresponding to different steel grades, controlling servo valves of hydraulic systems of the first to sixth throwing racks through electric signals to achieve the required roll gap size and achieve the expected reduction. Thereby achieving the purpose of improving the quality of the billet steel.
Claims (7)
1. A device for realizing double operation modes of a billet continuous casting machine is characterized in that the device is provided with a plurality of densely arranged drawing frames and a knockout frame (11) in each flow of the billet continuous casting machine along the casting direction in sequence, the drawing frames and the knockout frame (11) are provided with upper compression rollers (10) and lower compression rollers, each upper compression roller (10) is connected with a corresponding hydraulic cylinder and a corresponding hydraulic control system, the hydraulic control system of each drawing frame comprises a soft-reduction hydraulic unit (25), and the hydraulic control system of part of the drawing frames is also provided with a conventional hydraulic unit (26);
the hydraulic control system of the knockout frame comprises a low-pressure overflow valve (31), a high-pressure overflow valve (30), a pressure selection valve (29), a knockout pressure reducing valve (28) and a knockout up-down selective reversing valve (27), wherein the knockout pressure reducing valve (28) reduces the system pressure to high pressure and then sends the high pressure to a port P and a control oil pipe of the knockout up-down selective reversing valve (27), the port P of the pressure selection valve (29) is connected with a control oil port of the knockout pressure reducing valve (28), the port T is connected with the control oil pipe, a port A of the pressure selection valve (29) is connected with an oil inlet of the low-pressure overflow valve (31) and an oil outlet of the high-pressure overflow valve (30), and a port B is connected with an oil outlet of the low-pressure overflow valve (31) and an oil inlet of the high-pressure overflow valve (30); a T port of the upper and lower knockout selective reversing valve (27) is connected with an oil tank, and an A port and a B port are respectively connected with a rear cavity and a front cavity of a hydraulic cylinder of the knockout rack (11);
every flow of billet caster all is equipped with a pressure regulating unit (7), pressure regulating unit (7) include high pressure relief valve (13) and manometer (14), high pressure relief valve (13) send into the high pressure fuel pipe of conventional hydraulic unit (26) after reducing system's pressure to high pressure, manometer (14) connect the output at high pressure relief valve (13).
2. The apparatus for realizing the double operation modes of the billet continuous casting machine according to claim 1, wherein the soft reduction hydraulic unit (25) comprises a mode selection reversing valve (20), a hydraulic control one-way valve (21), a servo valve (22) and a double hydraulic control one-way valve (23), a port P of the servo valve (22) is connected with system pressure oil through the hydraulic control one-way valve (21), a port T is connected with an oil tank, and a port A and a port B are respectively connected with a front cavity and a rear cavity of a billet drawing hydraulic cylinder (8) of a corresponding billet drawing frame through the double hydraulic control one-way valve (23); the P port of the mode selection reversing valve (20) is connected with system pressure oil, the T port is connected with a control oil pipe, and the A port and the B port control the opening and closing of the hydraulic control one-way valve (21) and the double hydraulic control one-way valve (23).
3. The apparatus for realizing the dual operation modes of the billet continuous casting machine according to claim 2, wherein the conventional hydraulic unit (26) comprises a low-pressure reducing valve (15), a pressure selection reversing valve (16), a billet up-down selection reversing valve (17) and a dual hydraulic control one-way valve (19), the low-pressure reducing valve (15) reduces the system pressure to be low and then sends the low pressure to a port P of the pressure selection reversing valve (16), a port T of the pressure selection reversing valve (16) is connected with a high-pressure oil pipe, a port A is connected with the port P of the billet up-down selection reversing valve (17), the port T of the billet up-down selection reversing valve (17) is connected with an oil tank, and the port A and the port B are respectively connected with a front cavity and a rear cavity of a hydraulic cylinder of a corresponding billet frame through the dual hydraulic control one-way valve (19).
4. A device for realizing the double operating modes of continuous billet casting machines according to claim 3, characterized in that the output end of the low pressure reducing valve (15) is provided with a billet withdrawal accumulator (18); and the output end of the knockout reducing valve (28) is provided with a knockout energy accumulator (32).
5. An apparatus for realizing the double operating modes of a billet caster according to claim 4, characterized in that the front chamber of said hydraulic drawing cylinder (8) is provided with a protective overflow valve (24).
6. An apparatus for performing the dual operating mode of a billet casting machine according to claim 5, wherein the number of the drawing frames in each strand of the billet casting machine is six, and the drawing frames in which the conventional hydraulic unit (26) is provided in the hydraulic control system are the first, second, fourth and sixth drawing frames.
7. Apparatus for implementing the double operating modes of continuous billet casting machines according to claim 6, characterized in that the said stretching accumulator (18) and the said strip-off accumulator (32) are both bellows-type accumulators.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107630852B (en) * | 2017-08-31 | 2019-04-05 | 宣化钢铁集团有限责任公司 | A method of straightening hydraulic control is realized using plug-in logical valve |
| CN109482834B (en) * | 2019-01-09 | 2021-02-19 | 山东钢铁股份有限公司 | Control method and system of continuous casting withdrawal and straightening machine |
| CN110394434B (en) * | 2019-08-06 | 2024-03-29 | 北京首钢国际工程技术有限公司 | Continuous casting billet large-reduction rolling mill reduction roll hydraulic control valve table |
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