CN110594210A - Hydraulic control system for press roll of withdrawal and straightening machine based on position and pressure double-control mode - Google Patents
Hydraulic control system for press roll of withdrawal and straightening machine based on position and pressure double-control mode Download PDFInfo
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- CN110594210A CN110594210A CN201910904590.3A CN201910904590A CN110594210A CN 110594210 A CN110594210 A CN 110594210A CN 201910904590 A CN201910904590 A CN 201910904590A CN 110594210 A CN110594210 A CN 110594210A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
Abstract
The invention discloses a hydraulic control system for a press roll of a tension leveler based on a position and pressure double control mode, which realizes the position and pressure double control of the tension leveler in three working states through a group of servo valves, and adopts a mode of taking a pressure closed loop as a main mode and performing position auxiliary control when clamping and feeding dummy ingot working conditions and conventional hot casting blank production working conditions. When the production condition is lightly pressed, the position closed-loop control is adopted as a main mode, and a pressure auxiliary control mode is adopted, so that the servo valve is controlled to accurately control the pressing position of the press roll of the tension leveler. The hydraulic loop is simple and reliable, and is completely suitable for hydraulic control of the press roll of the tension leveler of the continuous casting machine with the soft reduction function. When the servo valve, the pressure sensor or the displacement sensor has element faults, the production continuity of the continuous casting machine is not influenced. The hydraulic control system with the double control modes can also be used for judging the position of the solidification tail end of a casting blank.
Description
Technical Field
The invention belongs to the technical field of hydraulic control of continuous casting machines in the metallurgical industry, and relates to a hydraulic control system for a press roll of a tension leveler based on a position and pressure double control mode, which is suitable for a continuous casting machine with a soft press function.
Background
In the production process of a continuous casting machine with a soft reduction function, a dummy bar clamping working condition, a conventional hot casting blank production working condition and a soft reduction production working condition are usually available, and a hydraulic cylinder for driving a press roll of a withdrawal and straightening unit is not only used for clamping and conveying a dummy bar and a hot casting blank, but also used for providing soft reduction control through the hydraulic cylinder. When the dummy bar is clamped and fed and the production condition of a conventional hot casting blank is adopted, the hydraulic control system of the lower pressing roll of the withdrawal and straightening machine executes pressure control, and when the production condition is lightly pressed, the lower pressing roll of the withdrawal and straightening machine executes position closed-loop control, so that the hydraulic control system of the lower pressing roll of the withdrawal and straightening machine needs to be provided with two sets of loops including a pressure control loop and a position closed-loop control loop, and the elements of a hydraulic system are complex to configure.
In practical application, the pressure control loop can not control the pressing position of the press roll of the withdrawal and straightening unit in the working process, and the production of a continuous casting machine is easily interrupted when a pressure failure occurs in the pressure regulating element. When a position closed-loop control loop is executed, because of the influence of factors such as roll gap calibration, mechanical clearance of a press roll of a withdrawal and straightening machine, thermal deformation of a rack and the like, the actual roll gap of the press roll of the withdrawal and straightening machine cannot be truly reflected by position detection, and the roll gap control is deviated only by using position closed-loop control; when the reduction amount of the lower roll of the tension and straightening press is too large and the actual roll gap is smaller, the resistance of the tension blank is increased, the abrasion of the lower roll of the tension and straightening machine is intensified, the equipment of the tension and straightening machine is damaged, and even the phenomenon of blank stagnation or cracks generated in the casting blank can occur. When the reduction rolling of the withdrawal and straightening machine is too small and the actual roll gap is too large, the metallurgical effect of the soft reduction function cannot be realized, and in severe cases, the reduction driving roller of the withdrawal and straightening machine cannot output enough withdrawal force, so that the phenomenon of casting blank slipping or billet slipping occurs, and the normal production of a continuous casting machine is influenced.
Disclosure of Invention
In order to overcome the defects in the prior art, the technical problem to be solved by the invention is to provide a hydraulic control system for a tension leveler lower roll based on a position and pressure double control mode, which realizes position and pressure control under three working states of a pinch dummy bar working condition, a conventional hot casting blank production working condition and a soft reduction production working condition only through a group of servo valves, avoids a complex hydraulic pipeline with two loops of a pressure control loop and a position closed loop control loop, can realize the reduction position control when the servo valves, pressure sensors or displacement sensors have element faults, can realize the soft reduction function even when the reduction of the tension leveler lower roll is too small and the actual roll gap is too large, and is completely suitable for hydraulic control of the tension leveler lower roll of a continuous casting machine with the soft reduction function.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a withdrawal and straightening machine roll down hydraulic control system based on two accuse modes of position and pressure, withdrawal and straightening machine pneumatic cylinder (15) and withdrawal and straightening machine roll down (16) power connection, its characterized in that:
the hydraulic cylinder (15) is provided with a built-in position sensor (14) for detecting the position of the hydraulic cylinder in real time; the hydraulic cylinder (15) is connected with a hydraulic pipeline comprising a servo valve group, an accident pressure control loop, a pressure sensor group, a high-pressure filter group and an online flushing loop to form a position and pressure double-control mode loop; when the dummy ingot is clamped and conveyed and the production condition of a conventional hot casting blank is adopted, a pressure closed loop is adopted as a main mode and a position auxiliary control mode is adopted, and a servo valve is controlled to output stable dummy ingot pressure Pd and hot blank pressure Ph according to different working conditions; when the production condition is lightly pressed, the position closed-loop control is adopted as a main mode, and a pressure auxiliary control mode is adopted, so that the servo valve is controlled to accurately control the pressing position of the press roll of the tension leveler.
Furthermore, the servo valve group mainly comprises a servo valve (7), a first hydraulic control one-way valve (801), a second hydraulic control one-way valve (802) and a two-position four-way electromagnetic directional valve (5); the servo valve (7) has a safety position function, the safety position is in a 'y' shape, and the servo valve (7) is used for controlling the lifting, pressing-down position, lifting speed and pressing-down speed of the press-down roller (16) and the pressure of two cavities of the hydraulic cylinder (15); the first hydraulic control one-way valve (801) and the second hydraulic control one-way valve (802) are used for one-way isolation of hydraulic oil at an outlet A pipeline and an outlet B pipeline of the servo valve (7); when an electromagnet a of the two-position four-way electromagnetic reversing valve (5) is electrified, a first hydraulic control one-way valve (801) and a second hydraulic control one-way valve (802) are opened;
the accident pressure control loop mainly comprises a pressure reducing valve (3), a two-position two-way stop type directional valve (4) and a third one-way valve (203); an oil port B of the pressure reducing valve (3) is connected with an energy accumulator pressure oil source PE through a first ball valve (101), and an oil port A of the pressure reducing valve (3) is connected with an oil port P1 of a two-position two-way stop-type directional valve (4); an oil port T of the two-position two-way stop type directional valve (4) is connected with an oil port A of the third one-way valve (203) and is connected with an outlet pipeline of an oil port B of the first hydraulic control one-way valve (801) through the third one-way valve (203); the third one-way valve (203) is used for one-way isolation of the accident pressure control loop and an outlet pipeline of an oil port A of the servo valve (7);
the pressure sensor group mainly comprises a first pressure sensor (1201) and a second pressure sensor (1202), the first pressure sensor (1201) detects the pressure value of a rodless cavity pipeline of the hydraulic cylinder (15) in real time, and the second pressure sensor (1202) detects the pressure value of a rod cavity pipeline of the hydraulic cylinder (15) in real time;
the high-pressure filter group filters hydraulic oil entering and returning to the servo valve (7), plays a role in protecting the servo valve (7), and mainly comprises a high-pressure filter (6), a first high-pressure one-way filter (1101) and a second high-pressure one-way filter (1102); the high-pressure filter (6) is arranged at a port P of the servo valve (7), the first high-pressure one-way filter (1101) is arranged on a port A pipeline of the servo valve (7), and the second high-pressure one-way filter (1102) is arranged on a port B pipeline of the servo valve (7);
the online flushing loop mainly comprises a two-position three-way ball valve (10) and a fifth ball valve (105) arranged on a hydraulic cylinder (15); an oil port A of the two-position three-way ball valve (10) is connected with the second high-pressure one-way filter (1102), an oil port B of the two-position three-way ball valve (10) is connected with an oil port B pipeline of the second hydraulic control one-way valve (802), an oil port C of the two-position three-way ball valve (10) is connected with an oil return pipeline T, and online flushing of an A pipeline and a B pipeline of an outlet of the servo valve (7) is achieved.
Furthermore, a port P of the servo valve (7) is connected with a pressure oil source P of the hydraulic system through the high-pressure filter (6) and the second ball valve (102), and a port T of the servo valve (7) is connected with an oil port A of the second one-way valve (202) and is connected with an oil return pipeline T through the second one-way valve (202); the port A of the servo valve (7) is connected with the oil port A of the first hydraulic control one-way valve (801), and the port B of the servo valve (7) is connected with the oil port A of the second hydraulic control one-way valve (802);
an oil port X of the first hydraulic control one-way valve (801) is connected with an oil port B of the two-position four-way electromagnetic directional valve (5), and an oil port L of the first hydraulic control one-way valve (801) is connected with an oil port A of the first one-way valve (201) and is connected with an oil drainage pipeline L through the first one-way valve (201);
an oil port A of the second hydraulic control one-way valve (802) is connected with an oil port B of the servo valve (7), an oil port X of the second hydraulic control one-way valve (802) is connected with an oil port B of the two-position four-way electromagnetic directional valve, and an oil port L of the second hydraulic control one-way valve (802) is connected with an oil port A of the first one-way valve (201) and is connected with an oil drainage pipeline L through the first one-way valve (201);
an oil port P of the two-position four-way electromagnetic reversing valve (5) is connected with a pressure oil source P through a second ball valve (102), and an oil port T of the two-position four-way electromagnetic reversing valve (5) is connected with an oil port A of a first one-way valve (201) and is connected with an oil drainage pipeline L through the first one-way valve (201).
An oil port A of the second one-way valve (202) is connected with an oil port T of the servo valve (7), an oil port B of the second one-way valve (202) is connected with an oil return pipeline T, and the second one-way valve (202) is used for isolating the oil return pipeline T and the oil return pipeline T of the servo valve (7) in a one-way mode and providing oil return back pressure for the servo valve (7); an oil port A of the fourth check valve (204) is connected with an oil return pipeline T, and an oil port B of the fourth check valve (204) is connected with an oil port B outlet pipeline of the second hydraulic control check valve (802); the fourth check valve (204) is used for oil supplement control of a rod cavity of the hydraulic cylinder (15) and prevents the hydraulic cylinder (15) from being damaged by air suction of the rod cavity.
Furthermore, an overflow valve (9) is further arranged, a P port of the overflow valve (9) is connected with an outlet pipeline of an oil port B of the first hydraulic control one-way valve (801), and a T port of the overflow valve (9) is connected with an oil return pipeline T; the overflow valve (9) is used for overpressure protection of the rodless cavity of the hydraulic cylinder (15), so that the phenomenon that the pressure of the rodless cavity of the hydraulic cylinder (15) is too high to cause sealing damage of the rodless cavity of the hydraulic cylinder (15) is avoided, and equipment damage caused by external load is prevented.
Furthermore, the accident pressure control loop is also provided with a pressure measuring joint M for measuring the pressure of the loop; in an accident state, an electromagnet a of the two-position two-way cut-off type directional valve (4) is electrified, and an accident pressure control loop automatically works; the pressure oil source PE of the energy accumulator is reduced into proper accident pressure through a pressure reducing valve (3), enters a rodless cavity of a hydraulic cylinder (15) through a two-position two-way stop type directional valve (4) and a third one-way valve (203), and a pressing roller (16) performs pressing control on a casting blank at the accident pressure.
Furthermore, one end of a first pressure sensor (1201) is connected with a first high-pressure one-way filter (1101) through a third ball valve (103), and the other end of the first pressure sensor is connected with a rodless cavity A of a hydraulic cylinder (15) through a hose (1301), so that the pressure value of a rodless cavity pipeline is detected in real time; one end of a second pressure sensor (1202) is connected with a second high-pressure one-way filter (1102) through a fourth ball valve (104), the other end of the second pressure sensor is connected with a rod cavity B of the hydraulic cylinder (15) through another hose (1302), and the pressure value of a pipeline with the rod cavity is detected in real time.
Furthermore, one end of the high-pressure filter (6) is connected with a pressure oil source P through a second ball valve (102), and the other end of the high-pressure filter is connected with an oil port P of the servo valve (7) and used for opening and closing the pressure oil source to enter the servo valve (7); one end of a first high-pressure one-way filter (1101) is connected with a pipeline of a port B of a first hydraulic control one-way valve (801), and the other end of the first high-pressure one-way filter is connected with a rodless cavity A of the hydraulic cylinder through a third ball valve (103) and a hose (1301); one end of the second high-pressure one-way filter (1102) is connected with a pipeline at the port B of the second hydraulic control one-way valve (802), and the other end of the second high-pressure one-way filter is connected with a rod cavity B of the hydraulic cylinder through a ball valve (104) and another hose (1302).
Further, when the two-position three-way ball valve (10) is in a working state, the oil port A is communicated with the oil port B, and when the two-position three-way ball valve is in an online flushing state, the oil port A is communicated with the oil port C; the fifth ball valve (105) is closed when the hydraulic cylinder (15) works and is opened when the on-line flushing is carried out.
Furthermore, the built-in position sensor (14) is provided with a protective cover and protected by cooling air.
Furthermore, when a dummy ingot clamping working condition and a conventional hot casting blank production working condition are adopted, an electromagnet a of the two-position four-way electromagnetic directional valve (5) is electrified, the first hydraulic control one-way valve (801) and the second hydraulic control one-way valve (802) are controlled to be opened, in the state, the servo valve (7) controls the lower pressing roller (16) to be lifted and pressed down, when the lower pressing roller (16) is pressed down, the opening degree of the servo valve (7) is automatically controlled to realize closed-loop control of the pressure in the two cavities of the hydraulic cylinder by detecting the numerical values of pressure sensors of a rodless cavity and a rod cavity of the hydraulic cylinder (15), and stable dummy ingot pressure Pd and hot blank pressure Ph are output according to different working conditions; the method comprises the steps that position auxiliary control is introduced by detecting the numerical value of a displacement sensor on a hydraulic cylinder, when the numerical value of the displacement is within a position range given by a process, pressure closed-loop control is effective, and when the numerical value of the displacement exceeds the position range given by the process, the pressure closed-loop control fails, and a position control protection mode is switched to;
under the light-pressure production working condition, an electromagnet a of the two-position four-way electromagnetic directional valve (5) is electrified, the first hydraulic control one-way valve (801) and the second hydraulic control one-way valve (802) are controlled to be opened, and the servo valve (7) controls the lifting and pressing positions, the lifting speed and the pressing speed of the press roller (16); the position of the hydraulic cylinder (15) is controlled in a closed loop manner by automatically controlling the servo valve (7) through detecting the numerical value of a displacement sensor on the hydraulic cylinder, and the pressing amount of the press roller (16) is accurately controlled; on the basis of position control, pressure auxiliary control is introduced by detecting the numerical values of pressure sensors of a rodless cavity and a rod cavity of a hydraulic cylinder (15), when the pressure numerical value is within a position range given by the process, the position closed-loop control is effective, and when the pressure numerical value exceeds the pressure range given by the process, the position closed-loop control is invalid, and a pressure control protection mode is switched.
Furthermore, when the servo valve (7), the pressure sensor or the displacement sensor has element faults, the electric automatic control servo valve (7) is arranged in a Y-shaped safety position, and the electromagnet a of the two-position four-way electromagnetic directional valve (5) loses power; in this state, the electromagnet a of the two-position two-way stop type directional valve (4) is electrified, and the circuit automatically works under the accident voltage; an accident oil source PE enters a rodless cavity of the hydraulic cylinder (15) through the pressure reducing valve (3), the two-position two-way stop type directional valve (4) and the third one-way valve (203), and the pressing roller (16) performs reduction control on the casting blank at accident pressure, so that the production continuity of a continuous casting machine is not influenced.
Further, when the hydraulic pipeline is overhauled and shut down after the tension straightening machine frame and the hydraulic hose are replaced or secondary pollution is caused to the hydraulic pipeline due to maintenance work, the oil port A of the fifth ball valve (105) is manually opened and the oil port C of the two-position three-way ball valve (10) is manually switched to be communicated with the oil port A; in the state, the electromagnet a of the two-position two-way stop type directional valve (4) is electrified, and the pressure oil is communicated to the oil return pipeline T through the oil ports C of the pressure reducing valve (3), the two-position two-way stop type directional valve (4), the first high-pressure one-way filter (1101), the fifth ball valve (105), the second high-pressure one-way filter (1102) and the two-position three-way ball valve (10), so that online flushing oil return is formed. The online flushing circuit does not pass through the servo valve (7).
The working principle of the invention is as follows:
when the dummy ingot is clamped and conveyed and the production condition of a conventional hot casting blank is adopted, the electric automatic control servo valve realizes the closed-loop control of the pressure in the hydraulic cylinder cavity by detecting the numerical values of the pressure sensors of the rodless cavity and the rod cavity of the hydraulic cylinder, and outputs stable dummy ingot pressure Pd and hot blank pressure Ph according to different working conditions; furthermore, position auxiliary control is introduced by detecting the value of a displacement sensor on the hydraulic cylinder, when the displacement value is within the position range given by the process, the pressure closed-loop control is effective, and when the displacement value exceeds the position range given by the process, the pressure closed-loop control fails, and the position control protection mode is switched.
When the production is carried out under a soft reduction condition, the servo valve (7) controls the lifting, the reduction position, the lifting speed and the reduction speed of the press roller (16); by detecting the numerical value of a displacement sensor on the hydraulic cylinder, the electric automatic control servo valve realizes the position closed-loop control of the hydraulic cylinder and accurately controls the pressing position of the hydraulic cylinder of the withdrawal and straightening unit; furthermore, the pressure auxiliary control is introduced by detecting the numerical values of the pressure sensors of the rodless cavity and the rod cavity of the hydraulic cylinder, when the pressure numerical value is within the position range given by the process, the position closed-loop control is effective, and when the pressure numerical value exceeds the pressure range given by the process, the position closed-loop control fails, and the pressure control protection mode is switched to.
When the servo valve, the pressure sensor or the displacement sensor has element faults, the electric automatic control servo valve is arranged at a safety position, the electromagnet a of the two-position two-way stop type directional valve is electrified, and a loop automatically works under the condition of the accident. The accident oil source PE enters a rodless cavity of the hydraulic cylinder through the pressure reducing valve, the two-position two-way stop type directional valve and the one-way valve, and the pressing roller of the tension leveler performs pressing control on the casting blank at the accident pressure without influencing the production continuity of the continuous casting machine.
Has the advantages that:
the invention realizes the double control of the position and the pressure of the hydraulic cylinder of the tension leveler in three working states through a group of servo valves, controls the lifting and the pressing positions, the lifting speed and the pressing speed of the press roll of the tension leveler, and can also control the pressure in the hydraulic cylinder cavity of the tension leveler, thereby realizing the double control of the pressing position of the press roll of the tension leveler and the pressure in the hydraulic cylinder cavity of the tension leveler. And when the dummy ingot is clamped and conveyed and the production condition of a conventional hot casting blank is adopted, a pressure closed loop is adopted as a main mode and a position auxiliary control mode is adopted, and a servo valve is controlled to output stable dummy ingot pressure Pd and hot blank pressure Ph according to different working conditions. When the production condition is lightly pressed, the position closed-loop control is adopted as a main mode, and a pressure auxiliary control mode is adopted, so that the servo valve is controlled to accurately control the pressing position of the press roll of the tension leveler.
The hydraulic loop is simple and reliable, has the advantages of high control precision and high automation degree, and is completely suitable for hydraulic control of the press roll of the tension leveler of the continuous casting machine with the soft reduction function.
When the servo valve, the pressure sensor or the displacement sensor has element faults, the servo valve is automatically controlled electrically to enable the tension leveler pinch-off roll to carry out reduction control on the casting blank at the accident pressure, and the production continuity of the continuous casting machine is not influenced.
In addition, the hydraulic control system with the double control modes can also be used for judging the position of the solidification tail end of a casting blank, on the premise of position closed loop auxiliary control, high-precision pressure closed loop control can reflect the stress state of the casting blank in real time, the position of a solid-liquid two-phase area is judged according to the stress state, and accurate feedback data are provided for the application of a dynamic soft reduction technology.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a hydraulic control system for a tension leveler compression roller based on a position and pressure double control mode.
The figures are numbered: the hydraulic control system comprises a ball valve (101/102/103/104/105), a one-way valve (201/202/203/204), a pressure reducing valve 3, a two-position two-way stop-type directional valve 4, a two-position four-way electromagnetic directional valve 5, a high-pressure filter 6, a servo valve 7, a hydraulic control one-way valve (801/802), an overflow valve 9, a two-position three-way ball valve 10, a high-pressure one-way filter (1101/1102), a pressure sensor (1201/1202), a hose (1301/1302), a built-in displacement sensor 14, a hydraulic cylinder 15 and a lower pressing roller.
Detailed Description
The invention is described in further detail below with reference to fig. 1 and the examples.
The hydraulic control system of the lower roll of the tension leveler based on the position and pressure double control mode implemented according to the invention is shown in figure 1 and comprises a servo valve bank, an accident pressure control loop, a pressure sensor group, a high-pressure filter, an online flushing loop and a hydraulic cylinder 15 with an internal position sensor. A continuous casting machine having a soft reduction function is generally provided with a plurality of withdrawal straightening machines, and the present invention is described by taking 1 withdrawal straightening machine as an example.
The servo valve group consists of a servo valve 7, a hydraulic control one-way valve (801/802), a two-position four-way electromagnetic directional valve 5, a ball valve 102, a one-way valve (202/204), an overflow valve 9 and a pressure measuring joint M. A port P of the servo valve 7 is connected with a pressure oil source P of the hydraulic system through the high-pressure filter 6 and the ball valve 102, and a port T of the servo valve 7 is connected with an oil port A of the one-way valve 202 and is connected with an oil return pipeline T through the one-way valve 202; the port A of the servo valve 7 is connected with the oil port A of the hydraulic control one-way valve 801, and the port B of the servo valve 7 is connected with the oil port A of the hydraulic control one-way valve 802; the servo valve 7 is used for controlling the lifting and pressing positions, the lifting speed and the pressing speed of the press roll 16 of the withdrawal and straightening machine and controlling the pressure of two cavities of the hydraulic cylinder 15 of the withdrawal and straightening machine. The servo valve 7 has a safety position function, and the safety position is a 'y' type. An oil port A of the hydraulic control one-way valve 801 is connected with an oil port A of the servo valve 7, an oil port X of the hydraulic control one-way valve 801 is connected with an oil port B of the two-position four-way electromagnetic directional valve 5, and an oil port L of the hydraulic control one-way valve 801 is connected with an oil port A of the one-way valve 201 and is connected with an oil drainage pipeline L through the one-way valve 201. An oil port A of the hydraulic control one-way valve 802 is connected with an oil port B of the servo valve 7, an oil port X of the hydraulic control one-way valve 802 is connected with an oil port B of the two-position four-way electromagnetic directional valve, and an oil port L of the hydraulic control one-way valve 802 is connected with an oil port A of the one-way valve 201 and is connected with an oil drainage pipeline L through the one-way valve 201. Two pilot operated check valves 801 and 802 are used for one-way isolation of the servo valve 7 outlet a and B lines of hydraulic oil. An oil port P of the two-position four-way electromagnetic reversing valve 5 is connected with a pressure oil source P through the ball valve 102, and an oil port T of the two-position four-way electromagnetic reversing valve 5 is connected with an oil port A of the one-way valve 201 and is connected with an oil drainage pipeline L through the one-way valve 201. When the electromagnet a of the two-position four-way electromagnetic reversing valve 5 is electrified, the hydraulic control one-way valve (801/802) is opened. The ball valve 102 is connected to a pressure oil source P for opening and closing the pressure oil source into the servo valve 7. An oil port A of the check valve 202 is connected with an oil port T of the servo valve 7, an oil port B of the check valve 202 is connected with an oil return pipeline T, and the check valve 202 is used for isolating the oil return pipeline T and the oil return pipeline T of the servo valve 7 in a one-way mode and providing a certain oil return back pressure for the servo valve 7. An oil port A of the check valve 204 is connected with an oil return pipeline T, and an oil port B of the check valve 204 is connected with an oil port B outlet pipeline of the hydraulic control check valve 802; the check valve 204 is used for oil supplement control of the rod cavity of the hydraulic cylinder 15, and prevents the rod cavity of the hydraulic cylinder 15 from being sucked empty, so that the sealing of the hydraulic cylinder 15 is damaged. A port P of the overflow valve 9 is connected with an outlet pipeline of an oil port B of the hydraulic control one-way valve 801, and a port T of the overflow valve 9 is connected with an oil return pipeline T; the overflow valve 9 is used for overpressure protection of the rodless cavity of the hydraulic cylinder, so that the phenomenon that the pressure of the rodless cavity of the hydraulic cylinder 15 is too high to cause sealing damage of the rodless cavity of the hydraulic cylinder 15 is avoided, and meanwhile, equipment damage caused by external load can be prevented. The pressure taps M are used for pressure measurement of the respective circuits.
The accident pressure control loop is composed of a ball valve 101, a pressure reducing valve 3, a two-position two-way stop type directional valve 4, a one-way valve 203 and a pressure measuring connector M. An oil port B of the pressure reducing valve 3 is connected with an energy accumulator pressure oil source PE through a ball valve 101, and an oil port A of the pressure reducing valve is connected with an oil port P1 of the two-position two-way stop type directional valve 4; the oil port T of the two-position two-way stop type directional valve 4 is connected with the oil port a of the check valve and is connected with the outlet pipeline of the oil port B of the hydraulic control check valve 801 through the check valve 203. The check valve 203 is used for one-way isolation of the accident pressure line from the port a outlet line of the servo valve 7. In an accident state, the electromagnet a of the two-position two-way stop type directional valve 4 is electrified, and the circuit automatically works under the accident voltage. The pressure oil source PE of the energy accumulator is decompressed into proper accident pressure through a pressure reducing valve 3, enters a rodless cavity of a hydraulic cylinder 15 through a two-position two-way stop type directional valve 4 and a one-way valve 203, and a lower roller 16 of the withdrawal and straightening unit performs reduction control on the casting blank at the accident pressure.
The pressure sensor group consists of a pressure sensor 1201 and a pressure sensor 1202; one end of a pressure sensor 1201 is connected with a high-pressure one-way filter 1101 through a ball valve 103, and the other end of the pressure sensor is connected with a rodless cavity A of the hydraulic cylinder 15 through a hose 1301, so that the pressure value of a rodless cavity pipeline is detected in real time. One end of a pressure sensor 1202 is connected with the high-pressure one-way filter 1102 through the ball valve 104, and the other end of the pressure sensor is connected with the rod cavity B of the hydraulic cylinder 15 through a hose 1302, so that the pressure value of the pipeline with the rod cavity is detected in real time.
The high-pressure filter group consists of a high-pressure filter 6, a high-pressure one-way filter 1101 and a high-pressure one-way filter 1102; the high-pressure filter 6 is arranged at a port P of the servo valve, one end of the high-pressure filter is connected with a pressure oil source P through a ball valve 102, and the other end of the high-pressure filter is connected with an oil port P of the servo valve 7; the high-pressure one-way filter 1101 is arranged on a pipeline of an opening A of the servo valve 7, one end of the high-pressure one-way filter is connected with a pipeline of an opening B of the hydraulic control one-way valve 801, and the other end of the high-pressure one-way filter is connected with a rodless cavity A of the hydraulic cylinder through the ball valve 103 and the hose 1301; the high-pressure one-way filter 1102 is arranged on a pipeline at the port B of the servo valve 7, one end of the high-pressure one-way filter is connected with the pipeline at the port B of the hydraulic control one-way valve 802, and the other end of the high-pressure one-way filter is connected with a rod cavity B of the hydraulic cylinder through the ball valve 104 and the hose 1302. The three high-pressure filters filter the hydraulic oil entering and returning to the servo valve 7, and play a role in protecting the servo valve 7.
The online flushing loop consists of a two-position three-way ball valve 10 and a ball valve 105, and can realize online flushing of an outlet A pipeline and an outlet B pipeline of the servo valve 7. An oil port A of the two-position three-way ball valve 10 is connected with the high-pressure one-way filter 1102, an oil port B of the two-position three-way ball valve 10 is connected with an oil port B pipeline of the hydraulic control one-way valve 802, and an oil port C of the two-position three-way ball valve 10 is connected with an oil return pipeline T. When the two-position three-way ball valve 10 is in a working state, the oil port A is communicated with the oil port B, and when the two-position three-way ball valve is in an online flushing state, the oil port A is communicated with the oil port C. The ball valve 105 is arranged on the hydraulic cylinder 15 of the withdrawal straightening machine, and is closed during working and opened during online flushing.
The hydraulic cylinder with the built-in displacement sensor consists of a built-in displacement sensor 14, a hydraulic cylinder 15 and a pressing roller 16. The built-in displacement sensor 14 detects the position of the hydraulic cylinder 15 in real time, and the built-in displacement sensor 14 is provided with a protective cover and protected by cooling air.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications, equivalent variations and modifications of the above described embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
The working process of the present invention is described below with reference to three working states and the principle of each loop operation:
(1) pinch dummy ingot working condition
Under the working condition of clamping and feeding dummy ingots, the electromagnet a of the two-position four-way electromagnetic directional valve 5 is electrified to control and open the hydraulic control one-way valves 801 and 802, and in the state, the servo valve 7 controls the lifting and the pressing of the lower pressing roller 16 of the withdrawal and straightening machine. When the lower pressing roller 16 is pressed down, the opening degree of the servo valve 7 is electrically and automatically controlled by detecting the numerical values of the pressure sensors of the rodless cavity and the rod cavity of the hydraulic cylinder 15, so that the pressure in the hydraulic cylinder cavity is controlled in a closed loop mode, and stable dummy ingot pressure Pd is output.
(2) Conventional hot casting blank production conditions
Under the normal hot casting blank production working condition, the electromagnet a of the two-position four-way electromagnetic directional valve 5 is electrified to control and open the hydraulic control one-way valves 801 and 802, and in the state, the servo valve 7 controls the lifting and the pressing of the lower pressing roller 16 of the withdrawal and straightening machine. When the lower pressing roller 16 is pressed down, the opening degree of the servo valve 7 is electrically and automatically controlled by detecting the numerical values of the pressure sensors of the rodless cavity and the rod cavity of the hydraulic cylinder 15, so that closed-loop control over the pressure in the cavity of the hydraulic cylinder 15 is realized, and stable dummy ingot pressure Ph is output.
(3) Working condition of production under light press
Under the light-pressure production working condition, the electromagnet a of the two-position four-way electromagnetic directional valve 5 is electrified to control and open the hydraulic control one-way valves 801 and 802, and under the state, the servo valve 7 controls the lifting and pressing positions, the lifting speed and the pressing speed of the tension leveler lower press roller 16. By detecting the numerical value of the displacement sensor on the hydraulic cylinder, the electric automatic control servo valve 7 realizes the position closed-loop control on the hydraulic cylinder 15, and accurately controls the pressing amount of the hydraulic cylinder of the withdrawal and straightening unit. Furthermore, the pressure auxiliary control is introduced by detecting the values of the pressure sensors of the rodless cavity and the rod cavity of the hydraulic cylinder 15, when the pressure value is within the position range given by the process, the position closed-loop control is effective, and when the pressure value exceeds the pressure range given by the process, the position closed-loop control fails, and the pressure control protection mode is switched to.
(4) Emergency pressure circuit
When the servo valve 7, the pressure sensor or the displacement sensor have element faults, the electric automatic control servo valve 7 is arranged in a Y-shaped safety position, and the electromagnet a of the two-position four-way electromagnetic directional valve 5 is powered off; in this state, the electromagnet a of the two-position two-way stop type directional valve 4 is energized, and the circuit automatically operates under an accident voltage. An accident oil source PE enters a rodless cavity of the hydraulic cylinder 15 through the pressure reducing valve 3, the two-position two-way stop type directional valve 4 and the one-way valve 203, and the lower roller 16 of the tension leveler performs reduction control on a casting blank at an accident pressure without influencing the production continuity of a continuous casting machine.
(5) On-line flushing loop
When the maintenance is stopped after the withdrawal and straightening frame and the hydraulic hose are replaced or secondary pollution is caused to a hydraulic pipeline due to maintenance work, the oil port A of the ball valve 105 is manually opened and the oil port C of the two-position three-way ball valve 10 is manually switched to be communicated; in this state, the electromagnet a of the two-position two-way stop type directional valve 4 is electrified, and the pressure oil is communicated to the oil return pipeline T through the pressure reducing valve 3, the two-position two-way stop type directional valve 4, the check valve 203, the high-pressure check filter 1101, the ball valve 105, the high-pressure check filter 1102 and the oil port C of the two-position three-way ball valve 10, so that online flushing oil return is formed; the in-line flush circuit does not pass through the servo valve 7.
Claims (10)
1. The utility model provides a withdrawal and straightening machine roll down hydraulic control system based on two accuse modes of position and pressure, withdrawal and straightening machine pneumatic cylinder (15) and withdrawal and straightening machine roll down (16) power connection, its characterized in that: the hydraulic cylinder (15) is provided with a built-in position sensor (14) for detecting the position of the hydraulic cylinder in real time; the hydraulic cylinder (15) is connected with a hydraulic pipeline comprising a servo valve group, an accident pressure control loop, a pressure sensor group, a high-pressure filter group and an online flushing loop to form a position and pressure double-control mode loop; when the dummy ingot is clamped and conveyed and the production condition of a conventional hot casting blank is adopted, a pressure closed loop is adopted as a main mode and a position auxiliary control mode is adopted, and a servo valve is controlled to output stable dummy ingot pressure Pd and hot blank pressure Ph according to different working conditions; when the production condition is lightly pressed, the position closed-loop control is adopted as a main mode, and a pressure auxiliary control mode is adopted, so that the servo valve is controlled to accurately control the pressing position of the press roll of the tension leveler.
2. The hydraulic control system for the tension leveler compression roller with position and pressure double control modes according to claim 1, characterized in that: the servo valve group mainly comprises a servo valve (7), a first hydraulic control one-way valve (801), a second hydraulic control one-way valve (802) and a two-position four-way electromagnetic directional valve (5); the servo valve (7) has a safety position function, the safety position is in a 'y' shape, and the servo valve (7) is used for controlling the lifting, pressing-down position, lifting speed and pressing-down speed of the press-down roller (16) and the pressure of two cavities of the hydraulic cylinder (15); the first hydraulic control one-way valve (801) and the second hydraulic control one-way valve (802) are used for one-way isolation of hydraulic oil at an outlet A pipeline and an outlet B pipeline of the servo valve (7); when an electromagnet a of the two-position four-way electromagnetic reversing valve (5) is electrified, a first hydraulic control one-way valve (801) and a second hydraulic control one-way valve (802) are opened;
the accident pressure control loop mainly comprises a pressure reducing valve (3), a two-position two-way stop type directional valve (4) and a third one-way valve (203); an oil port B of the pressure reducing valve (3) is connected with an energy accumulator pressure oil source PE through a first ball valve (101), and an oil port A of the pressure reducing valve (3) is connected with an oil port P1 of a two-position two-way stop-type directional valve (4); an oil port T of the two-position two-way stop type directional valve (4) is connected with an oil port A of the third one-way valve (203) and is connected with an outlet pipeline of an oil port B of the first hydraulic control one-way valve (801) through the third one-way valve (203); the third one-way valve (203) is used for one-way isolation of the accident pressure control loop and an outlet pipeline of an oil port A of the servo valve (7);
the pressure sensor group mainly comprises a first pressure sensor (1201) and a second pressure sensor (1202), the first pressure sensor (1201) detects the pressure value of a rodless cavity pipeline of the hydraulic cylinder (15) in real time, and the second pressure sensor (1202) detects the pressure value of a rod cavity pipeline of the hydraulic cylinder (15) in real time;
the high-pressure filter group filters hydraulic oil entering and returning to the servo valve (7), plays a role in protecting the servo valve (7), and mainly comprises a high-pressure filter (6), a first high-pressure one-way filter (1101) and a second high-pressure one-way filter (1102); the high-pressure filter (6) is arranged at a port P of the servo valve (7), the first high-pressure one-way filter (1101) is arranged on a port A pipeline of the servo valve (7), and the second high-pressure one-way filter (1102) is arranged on a port B pipeline of the servo valve (7);
the online flushing loop mainly comprises a two-position three-way ball valve (10) and a fifth ball valve (105) arranged on a hydraulic cylinder (15); an oil port A of the two-position three-way ball valve (10) is connected with the second high-pressure one-way filter (1102), an oil port B of the two-position three-way ball valve (10) is connected with an oil port B pipeline of the second hydraulic control one-way valve (802), an oil port C of the two-position three-way ball valve (10) is connected with an oil return pipeline T, and online flushing of an A pipeline and a B pipeline of an outlet of the servo valve (7) is achieved.
3. The hydraulic control system for the tension leveler compression roller with position and pressure double control modes according to claim 2, characterized in that: a port P of the servo valve (7) is connected with a pressure oil source P of the hydraulic system through the high-pressure filter (6) and the second ball valve (102), and a port T of the servo valve (7) is connected with an oil port A of the second one-way valve (202) and is connected with an oil return pipeline T through the second one-way valve (202); the port A of the servo valve (7) is connected with the oil port A of the first hydraulic control one-way valve (801), and the port B of the servo valve (7) is connected with the oil port A of the second hydraulic control one-way valve (802);
an oil port X of the first hydraulic control one-way valve (801) is connected with an oil port B of the two-position four-way electromagnetic directional valve (5), and an oil port L of the first hydraulic control one-way valve (801) is connected with an oil port A of the first one-way valve (201) and is connected with an oil drainage pipeline L through the first one-way valve (201);
an oil port A of the second hydraulic control one-way valve (802) is connected with an oil port B of the servo valve (7), an oil port X of the second hydraulic control one-way valve (802) is connected with an oil port B of the two-position four-way electromagnetic directional valve, and an oil port L of the second hydraulic control one-way valve (802) is connected with an oil port A of the first one-way valve (201) and is connected with an oil drainage pipeline L through the first one-way valve (201);
an oil port P of the two-position four-way electromagnetic reversing valve (5) is connected with a pressure oil source P through a second ball valve (102), and an oil port T of the two-position four-way electromagnetic reversing valve (5) is connected with an oil port A of a first one-way valve (201) and is connected with an oil drainage pipeline L through the first one-way valve (201);
an oil port A of the second one-way valve (202) is connected with an oil port T of the servo valve (7), an oil port B of the second one-way valve (202) is connected with an oil return pipeline T, and the second one-way valve (202) is used for isolating the oil return pipeline T and the oil return pipeline T of the servo valve (7) in a one-way mode and providing oil return back pressure for the servo valve (7); an oil port A of the fourth check valve (204) is connected with an oil return pipeline T, and an oil port B of the fourth check valve (204) is connected with an oil port B outlet pipeline of the second hydraulic control check valve (802); the fourth check valve (204) is used for oil supplement control of a rod cavity of the hydraulic cylinder (15) and prevents the hydraulic cylinder (15) from being damaged by air suction of the rod cavity.
4. The hydraulic control system for the tension leveler lower roll with position and pressure double control modes as claimed in claim 2 or 3, wherein: an overflow valve (9) is further arranged, a P port of the overflow valve (9) is connected with an outlet pipeline of an oil port B of the first hydraulic control one-way valve (801), and a T port of the overflow valve (9) is connected with an oil return pipeline T; the overflow valve (9) is used for overpressure protection of the rodless cavity of the hydraulic cylinder (15), so that the phenomenon that the pressure of the rodless cavity of the hydraulic cylinder (15) is too high to cause sealing damage of the rodless cavity of the hydraulic cylinder (15) is avoided, and equipment damage caused by external load is prevented.
5. The hydraulic control system for the tension leveler lower roll with position and pressure double control modes as claimed in claim 2 or 3, wherein: the accident pressure control loop is also provided with a pressure measuring joint M for measuring the pressure of the loop; in an accident state, an electromagnet a of the two-position two-way cut-off type directional valve (4) is electrified, and an accident pressure control loop automatically works; the pressure oil source PE of the energy accumulator is reduced into proper accident pressure through a pressure reducing valve (3), enters a rodless cavity of a hydraulic cylinder (15) through a two-position two-way stop type directional valve (4) and a third one-way valve (203), and a pressing roller (16) performs pressing control on a casting blank at the accident pressure.
6. The hydraulic control system for the tension leveler lower roll with position and pressure double control modes as claimed in claim 2 or 3, wherein: one end of a first pressure sensor (1201) is connected with a first high-pressure one-way filter (1101) through a third ball valve (103), the other end of the first pressure sensor is connected with a rodless cavity A of a hydraulic cylinder (15) through a hose (1301), and the pressure value of a rodless cavity pipeline is detected in real time; one end of a second pressure sensor (1202) is connected with a second high-pressure one-way filter (1102) through a fourth ball valve (104), the other end of the second pressure sensor is connected with a rod cavity B of the hydraulic cylinder (15) through another hose (1302), and the pressure value of a pipeline with the rod cavity is detected in real time.
7. The hydraulic control system for the tension leveler lower roll with position and pressure double control modes as claimed in claim 2 or 3, wherein: one end of the high-pressure filter (6) is connected with a pressure oil source P through a second ball valve (102), and the other end of the high-pressure filter is connected with an oil port P of the servo valve (7) and used for opening and closing the pressure oil source to enter the servo valve (7); one end of a first high-pressure one-way filter (1101) is connected with a pipeline of a port B of a first hydraulic control one-way valve (801), and the other end of the first high-pressure one-way filter is connected with a rodless cavity A of the hydraulic cylinder through a third ball valve (103) and a hose (1301); one end of the second high-pressure one-way filter (1102) is connected with a pipeline at the port B of the second hydraulic control one-way valve (802), and the other end of the second high-pressure one-way filter is connected with a rod cavity B of the hydraulic cylinder through a ball valve (104) and another hose (1302).
8. The hydraulic control system for the tension leveler lower roll with position and pressure double control modes as claimed in claim 2 or 3, wherein: when the two-position three-way ball valve (10) is in a working state, the oil port A is communicated with the oil port B, and when the two-position three-way ball valve is in an online flushing state, the oil port A is communicated with the oil port C; the fifth ball valve (105) is closed when the hydraulic cylinder (15) works and is opened when the on-line flushing is carried out.
9. The hydraulic control system for the tension leveler lower roll with position and pressure double control modes as claimed in claim 2 or 3, wherein: the built-in position sensor (14) is provided with a protective cover and protected by cooling air.
10. The hydraulic control system for the tension leveler lower roll with position and pressure double control modes as claimed in claim 2 or 3, wherein:
when a dummy ingot is clamped and conveyed and a conventional hot casting blank is produced, an electromagnet a of a two-position four-way electromagnetic directional valve (5) is electrified, a first hydraulic control one-way valve (801) and a second hydraulic control one-way valve (802) are controlled to be opened, a servo valve (7) controls the lifting and the pressing of a pressing roller (16) in the state, when the pressing roller (16) is pressed down, the opening degree of the servo valve (7) is automatically controlled to realize the closed-loop control of the pressure in two cavities of the hydraulic cylinder by detecting the values of pressure sensors of a rodless cavity and a rod cavity of the hydraulic cylinder (15), and stable dummy ingot pressure Pd and hot blank pressure Ph are output according to different working conditions; the method comprises the steps that position auxiliary control is introduced by detecting the numerical value of a displacement sensor on a hydraulic cylinder, when the numerical value of the displacement is within a position range given by a process, pressure closed-loop control is effective, and when the numerical value of the displacement exceeds the position range given by the process, the pressure closed-loop control fails, and a position control protection mode is switched to;
under the light-pressure production working condition, an electromagnet a of the two-position four-way electromagnetic directional valve (5) is electrified, the first hydraulic control one-way valve (801) and the second hydraulic control one-way valve (802) are controlled to be opened, and the servo valve (7) controls the lifting and pressing positions, the lifting speed and the pressing speed of the press roller (16); the position of the hydraulic cylinder (15) is controlled in a closed loop manner by automatically controlling the servo valve (7) through detecting the numerical value of a displacement sensor on the hydraulic cylinder, and the pressing amount of the press roller (16) is accurately controlled; on the basis of position control, pressure auxiliary control is introduced by detecting the numerical values of pressure sensors of a rodless cavity and a rod cavity of a hydraulic cylinder (15), when the pressure numerical value is within a position range given by the process, the position closed-loop control is effective, and when the pressure numerical value exceeds the pressure range given by the process, the position closed-loop control is invalid, and a pressure control protection mode is switched.
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| CN201910904590.3A CN110594210B (en) | 2019-09-24 | 2019-09-24 | Hydraulic control system for press roll of withdrawal and straightening machine based on position and pressure double-control mode |
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| CN111283673A (en) * | 2020-02-17 | 2020-06-16 | 广东博智林机器人有限公司 | Hydraulic system and mechanical arm |
| CN112560350A (en) * | 2020-12-22 | 2021-03-26 | 柳州钢铁股份有限公司 | Sudden accident prevention expansion control method and system for multi-flow square billet casting machine |
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| CN113534658A (en) * | 2021-08-25 | 2021-10-22 | 广东电网有限责任公司广州供电局 | Double closed-loop control system and method |
| CN113864254A (en) * | 2021-08-20 | 2021-12-31 | 宣化钢铁集团有限责任公司 | Withdrawal and straightening hydraulic control device |
| CN114109943A (en) * | 2021-12-08 | 2022-03-01 | 中冶南方工程技术有限公司 | Hydraulic servo system for converter two venturi throats |
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