CN114001061B

CN114001061B - Hydraulic control method for lifting of tundish of adjustable slag line

Info

Publication number: CN114001061B
Application number: CN202111214810.3A
Authority: CN
Inventors: 宁博; 丘铭军; 郭星良; 陈国防; 王亚强; 雷丛卉; 赵春丽; 郝瑾
Original assignee: China National Heavy Machinery Research Institute Co Ltd
Current assignee: China National Heavy Machinery Research Institute Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-10-18
Anticipated expiration: 2041-10-19
Also published as: CN114001061A

Abstract

The invention provides an adjustable slag line tundish lifting hydraulic control method, which is characterized in that an electric control cabinet is used for controlling different electromagnets of a first electromagnetic reversing valve in a lifting loop to be electrified, so that the functions of stably and quickly lifting and descending a tundish can be realized under the mutual cooperation action of a synchronous motor, an oil inlet throttling valve and a balance valve, and the process requirement of quickly lifting the tundish is met; the second electromagnetic directional valve in the slag regulating line loop is controlled by the electric control cabinet, and the lifting loop is automatically cut off in the slag regulating line process under the mutual cooperation of the oil inlet throttle valve, the one-way valve, the two-way logic cartridge valve of the lifting loop and the synchronous motor, so that the process requirement of slow lifting of the tundish slag regulating line is met. When the compensation loop is under the lifting working condition of the tundish and the working condition of the slag regulating line, the electric control cabinet carries out selective position compensation according to signals fed back by the displacement sensor so as to ensure the synchronism and stability in the action process of the tundish. The invention has simple control logic, high reliability, strong stability and high control precision.

Description

Hydraulic control method for lifting of adjustable slag line tundish

Technical Field

The invention belongs to the technical field of hydraulic control of continuous casting steel, and particularly relates to a hydraulic control method for lifting of an adjustable slag line tundish.

Background

In the field of continuous casting, an invasive water gap is used for receiving molten steel from a tundish to a crystallizer, which is a main technical means for realizing non-oxidation continuous casting of high-quality steel. In order to prolong the service life of the submerged nozzle, a slag line regulating process is generally used for realizing the following steps: in the continuous casting operation process, the relative position of a slag layer and an invasive nozzle in the crystallizer needs to be intermittently adjusted at a low speed to control the erosion time of the invasive nozzle in the crystallizer so as to achieve the purpose of delaying the erosion degree of the invasive nozzle in the crystallizer.

The technical route for adjusting the slag line is generally to control the lifting of the tundish to control the penetration depth of a submerged nozzle installed on the tundish in the crystallizer. The tundish is a device for receiving high-temperature liquid molten steel between the ladle and the crystallizer, is generally supported by a plurality of supporting points, has large tonnage and high danger, and requires higher reliability, safety and stability in the lifting process. The lifting action of the device must be compatible with the technological requirements of high-speed lifting (steel pouring preparation and accident treatment process) and low-speed lifting (slag line regulation process), and the movement of a plurality of fulcrums in the lifting process has high enough synchronous precision to prevent accidents such as molten steel tipping and invasive water gap breaking.

The technical scheme of using a tundish lifting hydraulic system to meet the process requirements at home and abroad at present has the following defects:

(1) And a plurality of proportional valves or servo valves control a plurality of oil cylinders to drive the tundish to lift. The technical scheme can meet the process requirements of high and low speed compatibility, and the control precision of the synchronous action of the multiple oil cylinders is extremely high. However, the control logic and the control mode are complex, the requirement on the cleanliness of a hydraulic system is high, the initial investment is high, the later maintenance cost is high, the proportional valve or the servo valve frequently acts due to the fact that the system is always in a closed-loop adjustment state in the process of achieving the lifting action of the tundish, the fault rate of the proportional valve or the servo valve is increased, and the use reliability of the whole set of system is reduced.

(2) The electromagnetic directional valve and the plurality of speed regulating valves control the plurality of oil cylinders to drive the tundish to lift. The technical scheme can realize that the tundish ascends and descends at a single speed, and the multiple oil cylinders can synchronously act. However, the scheme has low control precision, the synchronous lifting speed is greatly influenced by the load of the tundish and cannot be adjusted under the condition of continuous operation, and the requirement of the process on the adjustment of the slag line in the production process cannot be effectively realized.

(3) The electromagnetic directional valve and the synchronous motor control the plurality of oil cylinders to drive the tundish to lift. The technical scheme can realize that the tundish ascends and descends at a single speed, and the plurality of oil cylinders can synchronously act. But the synchronization precision depends on the performance of the synchronous motor, and the lifting speed cannot be changed once being adjusted, so that the requirements of high-speed and low-speed lifting processes cannot be met, and the synchronization precision is poor.

Disclosure of Invention

The invention aims to provide a hydraulic control method for lifting of an adjustable slag line tundish, which overcomes the technical problems in the prior art.

Therefore, the technical scheme provided by the invention is as follows:

a hydraulic control method for lifting a tundish with an adjustable slag line is characterized in that when the tundish rises or falls, a second one-way valve and a third one-way valve in a slag adjusting line loop are isolated from the slag adjusting line loop and a lifting loop in a one-way mode, an electric control cabinet is electrified by controlling an electromagnet Y2B or Y2A of a first electromagnetic reversing valve in the lifting loop respectively, stable lifting of the tundish is achieved through a plurality of lifting oil cylinder devices symmetrically connected to the tundish, and lifting speed is adjusted through a first oil inlet throttle valve and a second oil inlet throttle valve in the lifting loop respectively;

when the slag adjusting line of the tundish ascends or descends, the lifting loop is cut off, the electric control cabinet respectively controls the electromagnets Y1B or Y1A of the second electromagnetic reversing valve in the slag adjusting line loop to be electrified, the stable lifting of the slag adjusting line of the tundish is realized through the lifting oil cylinder device, and the lifting speed is respectively adjusted through the third oil inlet throttle valve and the fourth oil inlet throttle valve in the slag adjusting line loop.

In the lifting process of the tundish or the tundish slag regulating line, the electric control cabinet monitors the displacement sensors arranged in the lift cylinder devices in real time, when the displacement of one or more lift cylinder devices is smaller than the maximum displacement of all the lift cylinder devices, the electric control cabinet sends a signal to the compensation loop, and the lift cylinder devices with small displacement values are compensated through the corresponding electromagnetic valve action in the compensation loop.

When the tundish ascends, the electric control cabinet controls an electromagnet Y2B of the first electromagnetic reversing valve to be electrified, high-pressure oil from a pressure oil port P0 of the hydraulic station enters through a port P of the first electromagnetic reversing valve and flows out from a port A, flow rate adjustment is carried out through the first oil inlet throttling valve, the high-pressure oil enters into a port A of a balance valve in a lifting loop and flows out from a port B of the balance valve, the high-pressure oil enters into a port A of a synchronous motor, the synchronous motor equally distributes hydraulic oil to the ports, the hydraulic oil respectively enters into safety valve devices communicated with the lifting oil cylinder devices, the hydraulic oil flows into ports a of hydraulic control one-way valves of the safety valve devices and flows out from ports B, and the hydraulic oil enters into piston cavities of the lifting oil cylinder devices through ports H of the safety valve devices;

meanwhile, oil in the piston rod cavity of each lifting oil cylinder device flows in through the R port of each safety valve device and flows out through the B port, then is converged into the B port of the two-way logic cartridge valve and flows out from the A port of the two-way logic cartridge valve, flows through the second oil inlet throttling valve, enters the B port of the first electromagnetic reversing valve, then flows out from the T port of the first electromagnetic reversing valve and enters the oil return port T0 of the hydraulic station, and the action of lifting the tundish is completed.

When the tundish descends, the electric control cabinet controls an electromagnet Y2A of the first electromagnetic directional valve to be electrified, high-pressure oil from a pressure oil port P0 of the hydraulic station enters through a port P of the first electromagnetic directional valve and flows out from a port B, flow rate regulation is carried out through the second oil inlet throttle valve, the high-pressure oil enters into a port A of the two-way logic cartridge valve and flows out from the port B, then the high-pressure oil enters into ports B of safety valve devices communicated with the lifting oil cylinder devices respectively, flows out from ports R of the safety valve devices and enters into piston rod cavities of the lifting oil cylinder devices;

at the moment, the oil in the piston cavity of each lift cylinder device enters an H port of the installation valve device and flows in through a B port of a hydraulic control one-way valve in each safety valve device, under the condition that a high-pressure oil exists in a B port of a safety valve device connected with an X port of the hydraulic control one-way valve, the oil entering from the B port of the hydraulic control one-way valve can flow out from an a port and flow out from an A port of each safety valve device, the entering oil is uniformly distributed to each port through a synchronous motor and then flows out from an A port of the synchronous motor to enter a B port of a balance valve in a lifting loop, the B port of a two-way logic cartridge valve connected with the X port of the balance valve is the high-pressure oil, the oil entering from the B port of the balance valve can flow out from the A port, flows through a first throttle valve to enter the A port of a first electromagnetic directional valve and then flows out from a T port of the first electromagnetic directional valve to enter an oil return port T0 of a hydraulic station, and the tundish descending action is completed.

When the tundish rises in a slag adjusting line, the electric control cabinet controls an electromagnet Y1B of a second electromagnetic directional valve to be electrified, high-pressure oil from a pressure oil port P0 of the hydraulic station enters through a port P of the second electromagnetic directional valve and flows out from a port A, flow rate adjustment is carried out through a third oil inlet throttling valve, the high-pressure oil flows through a second one-way valve and then enters a port A of a synchronous motor, the synchronous motor distributes the hydraulic oil uniformly, then the hydraulic oil respectively enters a port A of each safety valve device communicated with the lifting oil cylinder device, flows in from a port a of a hydraulic control one-way valve of each safety valve device and flows out from a port B, and the hydraulic oil enters a piston cavity of each lifting oil cylinder device through an H port of each safety valve device;

at the moment, oil in the piston rod cavity of each lift cylinder device flows in through the R port of each safety valve device and flows out from the B port, then is converged into the B port of the two-way logic cartridge valve and flows out from the A port, flows through the second oil inlet throttling valve, enters the B port of the first electromagnetic directional valve, flows out from the T port of the first electromagnetic directional valve and enters the oil return port T0 of the hydraulic station, and the action of lifting the tundish slag adjusting line is completed.

When the tundish is descended during slag adjusting line, the electric control cabinet controls an electromagnet Y1A of the second electromagnetic directional valve to be electrified, high-pressure oil enters through a P port of the second electromagnetic directional valve and flows out from a B port, enters an X port of the two-way logic cartridge valve to close the A port and the B port of the two-way logic cartridge valve, performs flow rate adjustment through a fourth oil inlet throttle valve, flows through a third one-way valve, respectively enters the B ports of safety valve devices communicated with the lifting oil cylinder devices, flows out from R ports of the safety valve devices and enters piston rod cavities of the lifting oil cylinder devices;

at the moment, oil in the piston cavity of each lift cylinder device enters an H port of each safety valve device and flows in through a B port of each corresponding hydraulic control one-way valve, at the moment, an X port of each hydraulic control one-way valve is connected with a B port of each safety valve device to form high-pressure oil, so that the oil entering from the B port of each hydraulic control one-way valve can flow out from the a port and flow out from the A port of each safety valve device, respectively enters each port of a synchronous motor, is uniformly distributed by the synchronous motor, then flows out from the A port of the synchronous motor and enters the B port of a balance valve, at the moment, the B port of a two-way logic cartridge valve connected with the X port of the balance valve is the high-pressure oil, so that the oil entering from the B port of the balance valve can flow out from the A port and flows into the A port of a first electromagnetic reversing valve through a first oil inlet throttle valve, then flows out from the T port of the first electromagnetic reversing valve and enters an oil return port T0 of a hydraulic station, and the descending of a tundish slag adjusting line is completed.

The compensation loop comprises a plurality of electromagnetic directional valves, each safety valve device is communicated with one electromagnetic directional valve, a P port of each electromagnetic directional valve is communicated with an A port of a main electromagnetic directional valve, a T port of each electromagnetic directional valve is communicated with an oil return port T0 of the hydraulic station, and the P port and the T port of the main electromagnetic directional valve are respectively communicated with a pressure oil port P0 and an oil return port T0 of the hydraulic station;

when the lifting oil cylinder device is compensated, the electric control cabinet controls the electromagnet Y of the main electromagnetic reversing valve to be electrified, the electromagnet Y of the electromagnetic reversing valve corresponding to the lifting oil cylinder device needing to be compensated is electrified, high-pressure oil from a pressure oil port P0 of the hydraulic station enters from a port P of the main electromagnetic reversing valve and flows out from a port A, enters into a port P of the corresponding electromagnetic reversing valve and flows out from a port PA, enters into a port PA of the corresponding safety valve device, passes through a one-way valve in the safety valve device and enters into a piston cavity of the lifting oil cylinder device needing to be compensated, the displacement compensation of the lifting oil cylinder device is increased to the same displacement value as that of the rest lifting oil cylinder devices, at the moment, the electromagnet Y of the main electromagnetic reversing valve is deenergized, the electromagnet Y of the corresponding electromagnetic reversing valve is deenergized, the high-pressure oil stops entering into the piston cavity of the lifting oil cylinder needing to be compensated, and the compensation action is finished.

In the whole process of ascending or descending the tundish, the X port of the two-way logic cartridge valve is connected with the B port of the second electromagnetic directional valve, and the B port of the second electromagnetic directional valve is communicated with the T port of the second electromagnetic directional valve and is connected with an oil return port T0 from a hydraulic station, so that the A port and the B port of the two-way logic cartridge valve are kept in a communicated state, and oil is allowed to freely circulate; the third one-way valve isolates the port B of the two-way logic cartridge valve from the port B of the second electromagnetic directional valve, so that oil from a piston rod cavity of each lift cylinder device or the two-way logic cartridge valve cannot enter the port T through the port B of the second electromagnetic directional valve and enter an oil return port T0 from a hydraulic station; the second one-way valve isolates the port B of the balance valve from the port A of the second electromagnetic reversing valve, so that oil from the port A of the balance valve or the port A of the synchronous motor cannot enter the port T through the port A of the second electromagnetic reversing valve and enter the oil return port T0 of the hydraulic station, and the ascending or descending action of the tundish is not influenced by the second electromagnetic reversing valve.

In the process of ascending the slag regulating line of the whole tundish, the X port of the two-way logic cartridge valve is connected with the B port of the second electromagnetic reversing valve, the B port of the second electromagnetic reversing valve is communicated with the T port of the second electromagnetic reversing valve and is connected with an oil return port T0 of a hydraulic station, so that the A port and the B port of the two-way logic cartridge valve are respectively kept in a communicated state, and oil is allowed to freely flow;

the X port of the balance valve is connected with the B port of the two-way logic cartridge valve and is in a non-pressure state, so that high-pressure oil from the B port of the second one-way valve cannot enter the A port from the B port of the balance valve, enter the A port of the first electromagnetic reversing valve and enter the T0 port of the hydraulic station, and the ascending process of the slag regulating line is not influenced by the first electromagnetic reversing valve.

In the process of descending of a slag regulating line of the whole tundish, the X port of the two-way logic cartridge valve is connected with the B port of the second electromagnetic directional valve, the B port of the second electromagnetic directional valve is communicated with the P port of the second electromagnetic directional valve and is connected with the pressure oil port P0 of the hydraulic station, so that the A port and the B port of the two-way logic cartridge valve are kept in a closed state, and oil cannot flow to the A port from the B port of the two-way logic cartridge valve and enters the B port of the first electromagnetic directional valve through the second throttling oil inlet valve and then enters the oil return port T0 from the hydraulic station;

the second one-way valve isolates the port B of the balance valve from the port A of the second electromagnetic directional valve, so that oil from the port A of the synchronous motor can not enter the port T through the port A of the second electromagnetic directional valve and enter the oil return port T0 of the hydraulic station, return oil of the slag regulating line descending action of the tundish enters the oil return port T0 of the hydraulic station through the port A of the first electromagnetic directional valve, and the slag regulating line descending action of the tundish is completed.

The invention has the beneficial effects that:

according to the hydraulic control method for lifting of the tundish of the adjustable slag line, the different electromagnets of the first electromagnetic reversing valve in the lifting loop are controlled to be electrified through the electric control cabinet, so that under the mutual cooperation action of the synchronous motor, the oil inlet throttle valve and the balance valve, the stable and rapid lifting and descending functions of the tundish can be realized, and the technological requirement of rapid lifting of the tundish is met; the second electromagnetic directional valve in the slag adjusting line loop is controlled by the electric control cabinet, and the lifting loop is automatically cut off in the slag adjusting line process under the mutual cooperation action of the oil inlet throttle valve, the one-way valve, the two-way logic cartridge valve of the lifting loop and the synchronous motor, so that the process requirement of slow lifting of the tundish slag adjusting line is met.

When the compensation loop is under the lifting working condition and the slag adjusting line working condition of the tundish, the electric control cabinet carries out selective position compensation according to signals fed back by the displacement sensor so as to ensure the synchronism and stability of the tundish in the action process. The invention has the advantages that when the lifting working condition of the tundish and the working condition of the slag regulating line are carried out, the lifting loop and the slag regulating line loop are not influenced mutually, the problem of reliability reduction caused by the control of a proportional valve or a servo valve is solved, and the problem that the synchronous lifting of the tundish cannot meet the automatic switching of high-speed lifting and low-speed lifting by only using a speed regulating valve and a synchronous motor is solved.

The following will be described in further detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure: 101. a first displacement sensor; 102. a second displacement sensor; 103. a third displacement sensor; 104. a fourth displacement sensor; 201. a first lift cylinder device; 202. a second lift cylinder device; 203. a third lift cylinder device; 204. a fourth lift cylinder apparatus; 301. a first safety valve device; 302. a second safety valve device; 303. a third safety valve device; 304. a fourth safety valve device; 4. a synchronous motor; 5. a balancing valve; 601. a third electromagnetic directional valve; 602. a fourth electromagnetic directional valve; 603. a fifth electromagnetic directional valve; 604. a sixth electromagnetic directional valve; 605. a seventh electromagnetic directional valve; 701. a first electromagnetic directional valve; 702. a second electromagnetic directional valve; 801. a second check valve; 802. a third check valve; 901. a third oil inlet throttle valve; 902. a fourth oil inlet throttling valve; 903. a first oil inlet throttle valve; 904. a second oil inlet throttle valve; 10. a slag conditioning line loop; 11. a two-way logic cartridge valve; 12. a lifting loop; 13. a compensation loop; 14. a hydraulic control one-way valve; 15. a first check valve; 16. an overflow valve.

Detailed Description

The following description is given by way of example of the present invention and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

Example 1:

the embodiment provides a hydraulic control method for lifting of an adjustable slag line tundish, when the tundish ascends or descends, a second one-way valve 801 and a third one-way valve 802 in a slag line adjusting loop 10 are isolated in a one-way mode to form the slag line adjusting loop 10 and a lifting loop 12, an electric control cabinet is respectively electrified by controlling an electromagnet Y2B or Y2A of a first electromagnetic reversing valve 701 in the lifting loop 12, the stable lifting of the tundish is realized by a plurality of lifting oil cylinder devices symmetrically connected to the tundish, and the lifting speed is respectively adjusted by a first oil inlet throttle valve 903 and a second oil inlet throttle valve 904 in the lifting loop 12;

when the slag regulating line of the tundish rises or falls, the lifting loop 12 is cut off, the electric control cabinet respectively controls the electromagnets Y1B or Y1A of the second electromagnetic directional valve 702 in the slag regulating line loop 10 to be electrified, the stable lifting of the slag regulating line of the tundish is realized through the lifting oil cylinder device, and the lifting speed is respectively regulated through the third oil inlet throttle valve 901 and the fourth oil inlet throttle valve 902 in the slag regulating line loop 10.

As shown in fig. 1, the lifting loop 12 includes a balance valve 5, a two-way logic cartridge valve 11, a first oil-inlet throttle valve 903, a second oil-inlet throttle valve 904 and a first electromagnetic directional valve 701, and a port B of the balance valve 5 is communicated with the synchronous motor 4; the port A of the balance valve 5 is communicated with the port B of the first oil inlet throttling valve 903, the port A of the first throttling valve is connected with the port A of the first electromagnetic directional valve 701, the safety valve device is communicated with the port B of the two-way logic cartridge valve 11, the port A of the two-way logic cartridge valve 11 is communicated with the port B of the second oil inlet throttling valve 904, the port A of the second oil inlet throttling valve 904 is communicated with the port B of the first electromagnetic directional valve 701, the port P of the first electromagnetic directional valve 701 is communicated with a hydraulic station pressure oil port P0, the port T of the first electromagnetic directional valve 701 is connected with a hydraulic station oil return port T0, and the port X of the balance valve 5 is connected with the port B of the two-way logic cartridge valve 11.

The slag regulating line loop 10 comprises a second electromagnetic directional valve 702, a third oil inlet throttle valve 901, a fourth oil inlet throttle valve 902, a second one-way valve 801 and a third one-way valve 802, and the synchronous motor 4 is communicated with a port B of the second one-way valve 801; an opening A of the second one-way valve 801 is communicated with an opening B of the third oil inlet throttling valve 901, an opening A of the third oil inlet throttling valve 901 is communicated with an opening A of the second electromagnetic directional valve 702, an opening B of the two-way logic cartridge valve 11 is communicated with an opening B of the third one-way valve 802, an opening A of the third one-way valve 802 is communicated with an opening B of the fourth oil inlet throttling valve, an opening A of the fourth oil inlet throttling valve 902 is communicated with an opening B of the second electromagnetic directional valve 702, an opening B of the second electromagnetic directional valve 702 is communicated with an opening X of the two-way logic cartridge valve 11, an opening P of the second electromagnetic directional valve 702 is communicated with a hydraulic station pressure oil port P0, and an opening T of the second electromagnetic directional valve 702 is communicated with a hydraulic station oil return port T0.

According to the invention, different electromagnets of the first electromagnetic directional valve 701 in the lifting loop 12 are controlled to be electrified by the electric control cabinet, so that the stable and rapid lifting and lowering functions of the tundish can be realized under the mutual cooperation action of the synchronous motor 4, the oil inlet throttle valve and the balance valve 5, and the process requirement of rapid lifting of the tundish is met; the second electromagnetic directional valve 702 in the slag regulating line loop 10 is controlled by the electric control cabinet, and the lifting loop 12 is automatically cut off in the slag regulating line process under the mutual cooperation of the oil inlet throttle valve, the one-way valve, the two-way logic cartridge valve 11 of the lifting loop 12 and the synchronous motor 4, so that the process requirement of slow lifting of the tundish slag regulating line is met.

Example 2:

on the basis of embodiment 1, this embodiment provides an adjustable slag line tundish lifting hydraulic control method, in the lifting process of a tundish or a tundish slag line, an electric control cabinet monitors displacement sensors installed in lifting cylinder devices in real time, when the displacement of one or more lifting cylinder devices is smaller than the maximum displacement of all the lifting cylinder devices, the electric control cabinet sends a signal to a compensation loop 13, and the lifting cylinder devices with small displacement values are compensated through the corresponding electromagnetic valve action in the compensation loop 13.

The compensation circuit 13 comprises a plurality of electromagnetic directional valves, each safety valve device is communicated with one electromagnetic directional valve, a P port of each electromagnetic directional valve is communicated with an A port of a main electromagnetic directional valve, a T port of each electromagnetic directional valve is communicated with an oil return port T0 of the hydraulic station, and the P port and the T port of the main electromagnetic directional valve are respectively communicated with a pressure oil port P0 and an oil return port T0 of the hydraulic station.

When the compensation loop 13 is under the lifting working condition of the tundish and the working condition of the slag regulating line, the electric control cabinet carries out selective position compensation according to signals fed back by the displacement sensor so as to ensure the synchronism and stability in the action process of the tundish. According to the invention, when the lifting working condition of the tundish and the working condition of the slag adjusting line are carried out, the lifting loop 12 and the slag adjusting line loop 10 are not affected with each other, the problem of reliability reduction caused by control of a proportional valve or a servo valve is solved, and the problem that automatic switching of high-speed lifting and low-speed lifting can not be met when the synchronous lifting of the tundish is realized by only using a speed regulating valve and a synchronous motor 4 is also solved.

Example 3:

on the basis of embodiment 1, this embodiment provides an adjustable hydraulic control method for lifting a tundish of a slag line, when a tundish is lifted, an electric control cabinet controls an electromagnet Y2B of a first electromagnetic directional valve 701 to be electrified, high-pressure oil from a pressure oil port P0 of a hydraulic station enters through a port P of the first electromagnetic directional valve 701 and flows out from a port a, flow rate adjustment is performed through a first oil inlet throttle valve 903, the high-pressure oil enters through a port a of a balance valve 5 in a lifting loop 12, flows out from a port B of the balance valve 5 and enters through a port a of a synchronous motor 4, hydraulic oil is uniformly distributed to the ports by the synchronous motor 4, then respectively enters into safety valve devices communicated with the lifting oil cylinder devices, flows in through a ports a of hydraulic control check valves 14 of the safety valve devices and flows out through a ports B, and enters into piston cavities of the lifting oil cylinder devices through H ports of the safety valve devices;

meanwhile, oil in the piston rod cavity of each lift cylinder device flows in through the R port of each safety valve device and flows out through the B port, then is converged into the B port of the two-way logic cartridge valve 11 and flows out of the A port of the two-way logic cartridge valve 11, flows through the second oil inlet throttling valve 904, enters the B port of the first electromagnetic reversing valve 701, then flows out of the T port of the first electromagnetic reversing valve 701 and enters the oil return port T0 of the hydraulic station, and the movement of lifting the tundish is completed.

As shown in fig. 1, the safety valve device includes a pilot operated check valve 14, a first check valve 15 and an overflow valve 16, the safety valve device includes an H port, an a port, a PA port, a B port and an R port, one end of the H port and one end of the a port are both communicated with the piston cavity and are communicated with each other through the pilot operated check valve 14, the other end of the H port and the other end of the a port are communicated with the B port, the piston rod cavity is connected with the B port through the R port, the PA port is located between the a port and the B port, the a port is communicated with the synchronous motor 4, and the B ports of the safety valve devices are communicated with each other; the port a of the hydraulic control one-way valve 14 is communicated with the port A, the port B is communicated with the port H, and the control oil port x is communicated with the port B; the port a of the first check valve 15 is communicated with the port PA, and the port b is communicated with the port H; the relief valve 16 has a port a communicating with the port H and a port b communicating with the port R.

The pilot operated check valve 14 functions to allow oil to flow only from port a to port H when there is no pressure at port B of the relief valve means and to allow oil to flow freely between port a and port H when there is pressure at port B of the relief valve means. The first check valve 15 functions to allow oil to flow only in one direction from the port PA to the port H of the relief valve device. The relief valve 16 functions to limit the chamber pressure of the lift cylinder apparatus to prevent damage to the cylinder apparatus caused by excessive pressure.

Example 4:

on the basis of embodiment 1, the embodiment provides a hydraulic control method for lifting a tundish of an adjustable slag line, when the tundish descends, an electric control cabinet controls an electromagnet Y2A of a first electromagnetic directional valve 701 to be electrified, high-pressure oil from a pressure oil port P0 of a hydraulic station enters through a port P of the first electromagnetic directional valve 701 and flows out from a port B, flow rate regulation is performed through a second oil inlet throttle valve, the high-pressure oil enters through ports a of two logic cartridge valves 11 and flows out from the port B, then the high-pressure oil respectively enters through ports B of safety valve devices communicated with a lifting oil cylinder device, and flows out from ports R of the safety valve devices and enters piston rod cavities of the lifting oil cylinder devices;

at this time, the oil in the piston chamber of each lift cylinder device enters the H port of the installation valve device and flows in through the B port of the pilot operated check valve 14 in each safety valve device, under the condition that high-pressure oil exists in the B port of the pilot operated check valve 14 connected with the X port of the pilot operated check valve 14, the oil entering from the B port of the pilot operated check valve 14 can flow out from the a port and flow out from the a port of each safety valve device, the oil entering through the synchronous motor 4 is equally distributed to each port, then flows out from the a port of the synchronous motor 4 and enters the B port of the balance valve 5 in the lift circuit 12, at this time, the B port of the two-way logic cartridge valve 11 connected with the X port of the balance valve 5 is high-pressure oil, the oil entering from the B port of the balance valve 5 can flow out from the a port, flows through the first oil inlet throttle valve 903 to enter the a port of the first electromagnetic directional valve 701, then flows out from the T port of the first electromagnetic directional valve 701 and enters the oil return port T0 of the hydraulic station, and the tundish descending action is completed.

Wherein, two logical cartridge valves 11 functions are: when the pressure is applied to the control port X, the connection between the port B of the first electromagnetic directional valve 701 and each safety valve device is cut off; when the control port X is not pressurized, the connection between the port B of the first electromagnetic directional valve 701 and each relief valve device is opened. The function of the balance valve 5 is that oil can freely enter the port B from the port A, when the oil needs to enter the port A from the port B, the pressure of the port B of the two-way logic cartridge valve 11 is needed, and at the moment, the valve core is pushed to open a passage from the port B of the balance valve 5 to the port A in proportion to the pressure of the port B of the two-way logic cartridge valve 11.

Example 5:

on the basis of embodiment 1, this embodiment provides an adjustable slag line tundish lifting hydraulic control method, when a tundish is lifted on a slag line, an electric control cabinet controls an electromagnet Y1B of a second electromagnetic directional valve 702 to be powered, high-pressure oil from a pressure oil port P0 of a hydraulic station enters through a port P of the second electromagnetic directional valve 702 and flows out through a port a, flow rate adjustment is performed through a third oil inlet throttle valve 901, the high-pressure oil flows through the second one-way valve 801 and then enters a port a of a synchronous motor 4, the synchronous motor 4 distributes the hydraulic oil equally, and then the hydraulic oil respectively enters a port a of each safety valve device communicated with a lift cylinder device, flows in through a port a of a hydraulic control one-way valve 14 of each safety valve device and flows out through a port B, and enters a piston cavity of each lift cylinder device through a port H of each safety valve device;

at this time, the oil in the piston rod cavity of each lift cylinder device flows in through the R port of each safety valve device and flows out through the B port, then joins the B port of the two-way logic cartridge valve 11 and flows out from the a port, flows through the second oil inlet throttle valve 904, enters the B port of the first electromagnetic directional valve 701, then flows out from the T port of the first electromagnetic directional valve 701 and enters the oil return port T0 of the hydraulic station, and the movement of lifting the tundish slag adjusting line is completed.

The second check valve 801 and the third check valve 802 have functions of isolating the slag adjusting line loop 10 and the lifting loop 12 in a one-way manner, so that the lifting loop 12 is not affected by the slag adjusting line loop 10 when in operation. The second electromagnetic directional valve 702 has the function of controlling the lifting, the falling and the stopping of the tundish in the working condition of the slag regulating line through the electric control cabinet.

Example 6:

on the basis of embodiment 1, this embodiment provides an adjustable slag line tundish lifting hydraulic control method, when a tundish is lowered in a slag line adjustment process, an electric control cabinet controls an electromagnet Y1A of a second electromagnetic directional valve 702 to be electrified, high-pressure oil enters through a port P of the second electromagnetic directional valve 702 and flows out through a port B, enters through a port X of a two-way logic cartridge valve 11 to close ports a and B of the two-way logic cartridge valve 11, is subjected to flow rate adjustment through a fourth oil inlet throttle valve 902, and after flowing through a third one-way valve 802, enters into ports B of safety valve devices communicated with lift cylinder devices respectively, flows out through ports R of the safety valve devices and enters into piston rod cavities of the lift cylinder devices;

at this time, the oil in the piston cavity of each lift cylinder device enters the H port of each safety valve device and flows in through the B port of each corresponding pilot operated check valve 14, at this time, the X port of the pilot operated check valve 14 is connected with the B port of the safety valve device to have high-pressure oil, so that the oil entering from the B port of the pilot operated check valve 14 can flow out from the a port and flow out from the a port of each safety valve device, respectively enters the ports of the synchronous motor 4, the oil entering from the ports is equally distributed by the synchronous motor 4, then flows out from the a port of the synchronous motor 4 and enters the B port of the balance valve 5, at this time, the B port of the two-way logic cartridge valve 11 connected with the X port of the balance valve 5 is high-pressure oil, so that the oil entering from the B port of the balance valve 5 can flow out from the a port and flow through the first oil inlet throttle valve 903 to enter the a port 701 of the first electromagnetic directional valve 701, and then flows out from the T port of the first electromagnetic directional valve 701 and enters the oil return port T0 of the hydraulic station, thereby completing the lowering action of the tundish slag-adjusting line.

The third oil inlet throttle valve 901 and the fourth oil inlet throttle valve 902 have the function of adjusting the lifting speed of the tundish under the working condition of the slag line.

Example 7:

on the basis of embodiment 2, this embodiment provides an adjustable slag line tundish lifting hydraulic control method, where the compensation circuit 13 includes a plurality of electromagnetic directional valves, each safety valve device communicates with one electromagnetic directional valve, a port P of each electromagnetic directional valve communicates with a port a of a main electromagnetic directional valve, a port T of each electromagnetic directional valve communicates with an oil return port T0 of a hydraulic station, and the ports P and T of the main electromagnetic directional valve communicate with a pressure oil port P0 and an oil return port T0 of the hydraulic station, respectively;

The function of the general electromagnetic directional valve is to switch on or switch off the compensation circuit 13, and the compensation circuit 13 is switched off when any one electromagnetic directional valve is in fault, so that the production safety is ensured. The electromagnetic directional valves can respectively supplement oil to the lifting oil cylinder device or the plug cavity, and have the function of compensating the displacement of the lifting oil cylinder device in the lifting process of the tundish.

Example 8:

on the basis of the embodiment 3 or 4, the embodiment provides an adjustable slag line tundish lifting hydraulic control method, in the whole tundish lifting or descending process, a control oil port X of a two-way logic cartridge valve 11 is connected with a port B of a second electromagnetic directional valve 702, the port B of the second electromagnetic directional valve is communicated with a port T of the second electromagnetic directional valve and is connected with an oil return port T0 from a hydraulic station, so that the ports A and B of the two-way logic cartridge valve 11 are kept in a communicated state, and oil is allowed to freely flow; the third one-way valve 802 isolates the port B of the two-way logic cartridge valve 11 from the port B of the second electromagnetic directional valve 702, so that oil from each lift cylinder device piston rod cavity or the two-way logic cartridge valve 11 cannot enter the port T through the port B of the second electromagnetic directional valve 702 and enter the oil return port T0 from the hydraulic station; the second check valve 801 isolates the port B of the balance valve 5 from the port a of the second electromagnetic directional valve 702, so that oil from the port a of the balance valve 5 or the port a of the synchronous motor 4 cannot enter the port T through the port a of the second electromagnetic directional valve 702 and enter the oil return port T0 of the hydraulic station, and the lifting or lowering action of the tundish is not influenced by the second electromagnetic directional valve 702.

In this embodiment, the second check valve 801 can realize one-way isolation of the slag regulating line loop 10 and the lifting loop 12, so that the lifting loop 12 is not affected by the slag regulating line loop 10 when in operation.

Example 9:

on the basis of embodiment 5, in the hydraulic control method for lifting the tundish with the adjustable slag line, in the process of lifting the slag line in the whole tundish, a control oil port X of the two-way logic cartridge valve 11 is connected with a port B of the second electromagnetic directional valve 702, the port B of the second electromagnetic directional valve is communicated with a port T of the second electromagnetic directional valve and is connected with an oil return port T0 of a hydraulic station, so that the ports a and B of the two-way logic cartridge valve 11 are respectively kept in a communicated state, and oil is allowed to freely flow;

the X port of the balance valve 5 is connected with the B port of the two-way logic cartridge valve 11 and is in a non-pressure state, so that high-pressure oil from the B port of the third check valve 802 cannot enter the A port from the B port of the balance valve 5, enter the A port of the first electromagnetic directional valve 701 and enter the T0 port of the hydraulic station, and the ascending process of the slag regulating line is not influenced by the first electromagnetic directional valve 701.

According to the invention, the third one-way valve 802 can realize one-way isolation of the slag regulating loop 10 and the lifting loop 12, so that the slag regulating loop is not influenced by the lifting loop 12 when in work.

Example 10:

on the basis of embodiment 6, this embodiment provides an adjustable slag line tundish lifting hydraulic control method, in the process of the whole tundish lowering the slag line, a control oil port X of a two-way logic cartridge valve 11 is connected with a port B of a second electromagnetic directional valve 702, the port B of the second electromagnetic directional valve is communicated with a port P of the second electromagnetic directional valve and is connected with a pressure oil port P0 of a hydraulic station, so that the ports a and B of the two-way logic cartridge valve 11 are kept in a closed state, and oil cannot flow from the port B of the two-way logic cartridge valve 11 to the port a and enters the port B of the first electromagnetic directional valve 701 through a fourth throttling oil inlet valve and then enters an oil return port T0 from the hydraulic station;

the second one-way valve 801 isolates the port B of the balance valve 5 from the port A of the second electromagnetic directional valve 702, so that oil from the port A of the synchronous motor 4 can not enter the port T through the port A of the second electromagnetic directional valve 702 and enter the oil return port T0 of the hydraulic station, return oil of the lowering action of the slag regulating line of the tundish enters the oil return port T0 of the hydraulic station through the port A of the first electromagnetic directional valve 701, and the lowering action of the slag regulating line of the tundish is completed.

Example 11:

the embodiment provides a hydraulic control method for lifting of an adjustable slag line tundish, and the invention is further described in detail by taking 4 lifting oil cylinder devices as an example.

Firstly, the components of the adopted hydraulic system are explained: the D ends of piston rods of four lifting cylinder devices (a first lifting cylinder device 201, a second lifting cylinder device 202, a third lifting cylinder device 203 and a fourth lifting cylinder device 204) are connected with 4 supporting points of a tundish, a first displacement sensor 101, a second displacement sensor 102, a third displacement sensor 103 and a fourth displacement sensor 104 are correspondingly arranged in the four lifting cylinder devices, the first lifting cylinder device 201 is communicated with a first safety valve device 301, the second lifting cylinder device 202 is communicated with a second safety valve device 302, the third lifting cylinder device 203 is communicated with a third safety valve device 303, the fourth lifting cylinder device 204 is communicated with a fourth safety valve device 304, and the four groups are connected in the same mode.

The first relief valve device 301 is connected to the first lift cylinder device 201 as an example: a piston cavity of the first lift cylinder device 201 is connected with a port B of the pilot operated check valve 14 through a port H of the first safety valve device 301, a port a of the pilot operated check valve 14 is connected with a port a of the first safety valve device 301, and a control oil port x of the pilot operated check valve 14 is connected with a port B of the first safety valve device 301; the piston cavity of the first lift cylinder device 201 is also connected with the port b of the first check valve 15 through the port H of the first safety valve device 301, and the port a of the first check valve 15 is connected with the port PA of the first safety valve device 301; a piston rod cavity of the first lifting oil cylinder device 201 is connected with a port B through a port R of a first safety valve device 301; the port a of the relief valve 16 is connected to the port H of the first relief valve device 301, and the port b of the relief valve 16 is connected to the port R of the first relief valve device 301.

The lift circuit 12 includes a balancing valve 5, a two-way logic cartridge 11, a first in-flow throttling valve 903, a second in-flow throttling valve 904 and a first solenoid directional valve 701. The port a of the first safety valve device 301 is connected to the port A1 of the synchronous motor 4, the port a of the second safety valve device 302 is connected to the port A2 of the synchronous motor 4, the port a of the third safety valve device 303 is connected to the port A3 of the synchronous motor 4, the port a of the fourth safety valve device 304 is connected to the port A4 of the synchronous motor 4, and the inlet a of the synchronous motor 4 is connected to the port B of the balanced valve 5. A port A of the balance valve 5 is connected with a port B of a first oil-inlet throttling valve 903, and a port A of the first oil-inlet throttling valve 903 is connected with a port A of a first electromagnetic directional valve 701; the port B of the first safety valve device 301, the port B of the second safety valve device 302, the port B of the third safety valve device 303 and the port B of the fourth safety valve device 304 are mutually connected and are jointly connected with the port B of the two-way logic cartridge valve 11, the port A of the two-way logic cartridge valve 11 is connected with the port B of the second oil inlet throttling valve 904, and the port A of the second oil inlet throttling valve 904 is connected with the port B of the first electromagnetic directional valve 701; a port P of the first electromagnetic directional valve 701 is connected with a pressure oil port P0 from a hydraulic station, and a port T of the first electromagnetic directional valve 701 is connected with an oil return port T0 from the hydraulic station; the X port of the balance valve 5 is connected with the B port of the two-way logic cartridge valve 11.

The slag regulating line loop 10 comprises a second electromagnetic directional valve 702, a third oil inlet throttling valve 901, a fourth oil inlet throttling valve 902, a second one-way valve 801 and a third one-way valve 802. A port A of the synchronous motor 4 is connected with a port B of a second one-way valve 801, a port A of the second one-way valve 801 is connected with a port B of a third oil inlet throttling valve 901, and a port A of the third oil inlet throttling valve 901 is connected with a port A of a second electromagnetic directional valve 702; the port B of the two-way logic cartridge valve 11 is connected with the port B of the third one-way valve 802, the port A of the third one-way valve 802 is connected with the port B of the fourth oil-saving throttle valve, the port A of the fourth oil-saving throttle valve 902 is connected with the port B of the second electromagnetic directional valve 702, and the port B of the second electromagnetic directional valve 702 is connected with the port X of the two-way logic cartridge valve 11; the port P of the second electromagnetic directional valve 702 is connected with a pressure oil port P0 from the hydraulic station, and the port T of the second electromagnetic directional valve 702 is connected with an oil return port T0 from the hydraulic station.

In this embodiment, the compensation circuit 13 includes four electromagnetic directional valves, namely a third electromagnetic directional valve 601, a fourth electromagnetic directional valve 602, a fifth electromagnetic directional valve 603, and a sixth electromagnetic directional valve 604, and the total electromagnetic directional valve is a seventh electromagnetic directional valve 605.

A port PA of the first relief valve device 301 is connected to a port PA1 of the third electromagnetic directional valve 601, a port PA of the second relief valve device 302 is connected to a port PA2 of the fourth electromagnetic directional valve 602, a port PA of the third relief valve device 303 is connected to a port PA3 of the fifth electromagnetic directional valve 603, and a port PA of the fourth relief valve device 304 is connected to a port PA4 of the sixth electromagnetic directional valve 604; a port T of the third electromagnetic reversing valve 601, a port T of the fourth electromagnetic reversing valve 602, a port T of the fifth electromagnetic reversing valve 603 and a port T of the sixth electromagnetic reversing valve 604 are connected with an oil return port T0 from the hydraulic station; a port P of the third electromagnetic directional valve 601, a port P of the fourth electromagnetic directional valve 602, a port P of the fifth electromagnetic directional valve 603 and a port P of the sixth electromagnetic directional valve 604 are connected with a port A of the seventh electromagnetic directional valve 605; the port P of the seventh electromagnetic directional valve 605 is connected to a pressure port P0 from the hydraulic station, and the port T of the seventh electromagnetic directional valve 605 is connected to an oil return port T0 from the hydraulic station.

As shown in fig. 1, the control process is as follows:

1. when the tundish needs to be rapidly lifted, an electromagnet Y2B of the first electromagnetic directional valve 701 is electrified, high-pressure oil from pressure oil P0 of a hydraulic station enters through a port P of the first electromagnetic directional valve 701 and flows out from a port A, the flow rate is adjusted through a first oil inlet throttle valve 903 and enters into a port A of the balance valve 5, the high-pressure oil flows out from a port B of the balance valve 5, enters into a port A of the synchronous motor 4, the synchronous motor 4 equally distributes the hydraulic oil to outlets A1, A2, A3 and A4, then respectively enters into ports A of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304, flows in from ports a of hydraulic control one-way valves 14 of the 4 safety valve devices and flows out from ports B, and respectively enters into plug cavities or plug cavities of the first lifting oil cylinder device 201, the second lifting oil cylinder device 202, the third lifting oil cylinder device 203 and the fourth lifting oil cylinder device 204 through ports H of the safety valve devices; at this time, the oil in the piston rod cavities of the first lift cylinder device 201, the second lift cylinder device 202, the third lift cylinder device 203 and the fourth lift cylinder device 204 flows in through the R ports of the safety valve devices and flows out through the B port, then joins into the B port of the two-way logic cartridge valve 11 and flows out from the a port of the two-way logic cartridge valve 11, flows through the second oil inlet throttle valve 904, enters into the B port of the first electromagnetic directional valve 701, then flows out from the T port of the first electromagnetic directional valve 701 and enters into the oil return port T0 from the hydraulic station, and the rapid lifting of the tundish is completed.

In the whole process, a control oil port X of the two-way logic cartridge valve 11 is connected with a port B of the second electromagnetic reversing valve 702, and the port B of the second electromagnetic reversing valve is communicated with a port T of the second electromagnetic reversing valve and is connected with an oil return port T0 from a hydraulic station, so that the ports A and B of the two-way logic cartridge valve 11 are kept in a communicated state, and oil is allowed to freely flow; the third check valve 802 isolates the port B of the two-way logic cartridge valve 11 from the port B of the second electromagnetic directional valve 702, so that oil from a piston rod cavity of each lift cylinder device cannot enter the port T through the port B of the second electromagnetic directional valve 702 and enter an oil return port T0 from a hydraulic station; the second check valve 801 isolates the port B of the balance valve 5 from the port a of the second electromagnetic directional valve 702, so that high-pressure oil from the port a of the balance valve 5 cannot enter the port T through the port of the second electromagnetic directional valve 702701 and enter the oil return port T0 from the hydraulic station, and the rapid ascending action is ensured not to be influenced by the second electromagnetic directional valve 702.

2. When the tundish needs to descend quickly, the electromagnet Y2A of the first electromagnetic directional valve 701 is electrified, high-pressure oil from a P0 port of a hydraulic station enters through a P port of the first electromagnetic directional valve 701 and flows out of a B port, the flow rate is adjusted through the second oil inlet throttle valve, enters into a port A of the two-way logic cartridge valve 11 and flows out of the B port, then respectively enters into B ports of a first safety valve device 301, a second safety valve device 302, a third safety valve device 303 and a fourth safety valve device 304, and flows out of R ports of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304 and enters into piston rod cavities of the first lift cylinder device 201, the second lift cylinder device 202, the third lift cylinder device 203 and the fourth lift cylinder device 204; at this time, the oil in the piston chambers of the first lift cylinder device 201, the second lift cylinder device 202, the third lift cylinder device 203 and the fourth lift cylinder device 204 respectively enters the ports H of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304, flows in through the ports B of the pilot-controlled check valve 14, and because high-pressure oil exists at the ports B of the pilot-controlled check valve 14 connected to the ports X of the pilot-controlled check valve 14, the oil entering from the ports B of the pilot-controlled check valve 14 can flow out from the ports a, and flows out from the ports a of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304, and respectively enters the ports A1, A2, A3 and A4 of the synchronous motor 4, the oil equally distributes the oil entering from the ports A1, A2, A3 and A4, and then flows out from the ports B of the balance valve 5, and enters the ports B of the balance valve 5 because the ports B of the two logic valves connected to the ports X of the balance valve 5, the ports B of the balance valve 701, the high-pressure oil can flow out from the ports a port B of the electromagnetic reversing valve 903, and then flows out from the port B of the first electromagnetic reversing valve, and flows into the electromagnetic reversing station, so that the electromagnetic reversing valve 903 and the electromagnetic valve can quickly flows out.

In the whole process, a control oil port X of the two-way cartridge logic valve 11 is connected with a port B of the second electromagnetic directional valve 702, and the port B of the second electromagnetic directional valve is communicated with a port T of the second electromagnetic directional valve and is connected with an oil return port T0 from a hydraulic station, so that the ports A and B of the two-way cartridge logic valve are kept in a communicated state, and oil is allowed to freely circulate; the third one-way valve 802 isolates the port B of the two-way logic cartridge valve 11 from the port B of the second electromagnetic reversing valve 702, so that high-pressure oil from the port B of the two-way logic cartridge valve 11 cannot enter the port T from the port B of the second electromagnetic reversing valve 702 and enter an oil return port T0 from a hydraulic station; the second check valve 801 isolates the port B of the balance valve 5 from the port a of the second electromagnetic directional valve 702, so that oil from the port a of the synchronous motor 4 cannot enter the port T through the port a of the second electromagnetic directional valve 702 and enter the oil return port T0 from the hydraulic station, and the rapid descending action is ensured not to be influenced by the second electromagnetic directional valve 702.

3. When the tundish needs to be subjected to slag line adjustment and slowly rises, an electromagnet Y1B of the second electromagnetic directional valve 702 is electrified, high-pressure oil from a P0 port of the hydraulic station enters through a P port of the second electromagnetic directional valve 702 and flows out of an A port, the flow rate is adjusted through a third oil inlet throttling valve 901, the high-pressure oil flows through a second one-way valve 801 and then enters into the A port of the synchronous motor 4, the synchronous motor 4 uniformly distributes the hydraulic oil and then enters into the A ports of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304 through A ports of hydraulic control one-way valves 14 of the 4 safety valve devices and flows out of B ports, and the hydraulic oil enters into piston cavities of the first lift cylinder device 201, the second lift cylinder device 202, the third lift cylinder device 203 and the fourth lift cylinder device 204 through H ports of the safety valve devices; at the moment, oil in piston rod cavities of the first lift cylinder device 201, the second lift cylinder device 202, the third lift cylinder device 203 and the fourth lift cylinder device 204 flows in through R ports of all safety valve devices and flows out through B ports, then is converged into B ports of the two-way logic cartridge valves 11 and flows out from A ports of the two-way logic cartridge valves 11, flows through the second oil inlet throttling valve 904, enters B ports of the first electromagnetic reversing valves 701, flows out from T ports of the first electromagnetic reversing valves 701 and enters an oil return port T0 from a hydraulic station, and therefore slow rising of the tundish slag adjusting line is completed.

In the whole process, a control oil port X of the two-way logic cartridge valve 11 is connected with a port B of the second electromagnetic reversing valve 702, the port B is communicated with the port T under the condition that Y1B is electrified, and is connected with an oil return port T0 from a hydraulic station, so that the ports A and B of the two-way logic cartridge valve 11 are kept in a communicated state, and oil is allowed to freely flow; the X port of the balance valve 5 is connected with the B port of the two-way logic cartridge valve 11 and is in a non-pressure state, so that high-pressure oil from the B port of the third check valve 802 cannot enter the A port from the B port of the balance valve 5, enter the A port of the first electromagnetic directional valve 701 and enter the T0 port from a hydraulic station, and the slow rising process of the slag regulating line is not influenced by the first electromagnetic directional valve 701.

4. When the tundish needs to descend at a low speed, an electromagnet Y1A of the second electromagnetic directional valve 702 is electrified, high-pressure oil enters through a P port of the second electromagnetic directional valve 702 and flows out from a B port, the flow rate is regulated through a fourth oil inlet throttle valve 902, the oil flows through a third one-way valve 802, then respectively enters through the B ports of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304, flows out from R ports of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304 and enters piston rod cavities of the first lifting cylinder device 201, the second lifting cylinder device 202, the third lifting cylinder device 203 and the fourth lifting cylinder device 204; at this time, oil in a piston cavity of a piston rod cavity of the first lift cylinder device 201, the second lift cylinder device 202, the third lift cylinder device 203 and the fourth lift cylinder device 204 rises to enter a port H of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304 respectively, and flows in through a port B of the pilot operated check valve 14, because a port X of the pilot operated check valve 14 is connected with a port B of the safety valve device at this time, the oil entering from the port B of the pilot operated check valve 14 can flow out from the port a, and flows out from ports a of the first safety valve device 301, the second safety valve device 302, the third safety valve device 303 and the fourth safety valve device 304 to enter ports A1, A2, A3 and A4 of the synchronous motor 4 respectively, the oil entering from ports A1, A2, A3 and A4 is uniformly distributed by the synchronous motor 4, then flows out from a port a of the synchronous motor 4 to a port B of the balance valve 5, because two ports X of the balance valve 5 are connected with a port B, two ports a port a logical port B are connected with a port B of the balance valve 701, the oil inlet 701, the oil flows out from a port B of the first safety valve 701, the electromagnetic reversing valve 701, and flows into a slow speed of the first oil inlet of the first electromagnetic reversing station, and flows out from a reversing station, and flows into the electromagnetic reversing valve 903, and flows into the electromagnetic reversing station, so that the electromagnetic reversing station.

In the whole process, a control oil port X of the two-way logic cartridge valve 11 is connected with a port B of the second electromagnetic reversing valve 702, the port B of the second electromagnetic reversing valve is communicated with a port P of the second electromagnetic reversing valve and is connected with a high-pressure oil port P0 from a hydraulic station, so that the ports A and B of the two-way logic cartridge valve 11 are kept in a closed state, and oil cannot flow to the port A from the port B of the two-way logic cartridge valve 11, enters the port B of the first electromagnetic reversing valve 701 through a fourth throttling oil inlet valve and then enters an oil return port T0 from the hydraulic station; the second one-way valve 801 isolates the port B of the balance valve 5 from the port A of the second electromagnetic directional valve 702, so that oil from the port A of the synchronous motor 4 cannot enter the port T through the port A of the second electromagnetic directional valve 702 and enter the oil return port T0 from the hydraulic station, return oil of the slow descending action of the tundish slag regulating line enters the oil return port T0 from the hydraulic station through the port A of the first electromagnetic directional valve 701, and the slow descending action of the tundish slag regulating line is ingeniously completed.

5. In the lifting process, the basic synchronous actions of the first lifting cylinder device 201, the second lifting cylinder device 202, the third lifting cylinder device 203 and the fourth lifting cylinder device 204 are completed by forced flow distribution of the synchronous motor 4, but the precision of the synchronous motor 4 is greatly influenced by the flow and the gap of the physical structure of the synchronous motor 4, so that the requirement of the synchronous precision during quick lifting of a tundish and slow lifting under slag regulation is difficult to meet, and the synchronous precision is compensated by using the compensation loop 13 to meet the requirement of process precision.

The working principle is that during the lifting process, the first displacement sensor 101, the second displacement sensor 102, the third displacement sensor 103 and the fourth displacement sensor 104 respectively arranged in the first lift cylinder device 201, the second lift cylinder device 202, the third lift cylinder device 203 and the fourth lift cylinder device 204 detect the displacement of the four lift cylinder devices in real time, and when the displacement of one or more lift cylinder devices is smaller than the maximum displacement of the four lift cylinder devices, the corresponding electromagnetic valve in the compensation loop 13 performs compensation on the cylinder with a small displacement value.

Taking the compensation action of the first lift cylinder device 201 as an example, when four lift cylinder devices synchronously operate, when the displacement value detected by the first displacement sensor 101 arranged in the first lift cylinder device 201 is smaller than that of the other three lift cylinder devices, the electromagnet Y7 of the seventh electromagnetic directional valve 605 is electrified, the electromagnet Y3 of the third electromagnetic directional valve 601 is electrified, high-pressure oil from the P0 port of the hydraulic station enters from the P port of the seventh electromagnetic directional valve and flows out from the a port, enters into the P port of the third electromagnetic directional valve 601 and flows out from the PA1 port, enters into the PA port of the first safety valve device 301, passes through the check valve and enters into the piston cavity or the plug cavity of the first lift cylinder device 201, the displacement compensation of the first lift cylinder device 201 is increased to the same displacement value as that of the other three lift cylinder devices, then the electromagnet Y7 of the seventh electromagnetic directional valve 605 is electrified, the electromagnet Y3 of the third electromagnetic directional valve 601 is electrified, the high-pressure oil stops entering into the piston cavity of the first lift cylinder device 201, and the compensation action is finished. By the method, the precision of the tundish in the lifting process can meet the process requirement.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.

Claims

1. A hydraulic control method for lifting of a tundish of an adjustable slag line is characterized by comprising the following steps: when the tundish ascends or descends, the second one-way valve and the third one-way valve in the slag regulating line loop are isolated in a one-way mode to form the slag regulating line loop and the lifting loop, the electric control cabinet is electrified by controlling the electromagnet Y2B or Y2A of the first electromagnetic reversing valve in the lifting loop respectively, stable lifting of the tundish is achieved through the plurality of lifting oil cylinder devices symmetrically connected to the tundish, and the lifting speed is adjusted through the first oil inlet throttle valve and the second oil inlet throttle valve in the lifting loop respectively;

when the slag adjusting line of the tundish rises or falls, the lifting loop is cut off, the electric control cabinet respectively controls the electromagnets Y1B or Y1A of the second electromagnetic reversing valve in the slag adjusting line loop to be electrified, the stable lifting of the slag adjusting line of the tundish is realized through the lifting oil cylinder device, and the lifting speed is respectively adjusted through the third oil inlet throttle valve and the fourth oil inlet throttle valve in the slag adjusting line loop.

2. The hydraulic control method for lifting of the tundish of the adjustable slag line according to claim 1, is characterized in that: in the lifting process of the tundish or the tundish slag regulating line, the electric control cabinet monitors the displacement sensors arranged in the lift cylinder devices in real time, when the displacement of one or more lift cylinder devices is smaller than the maximum displacement of all the lift cylinder devices, the electric control cabinet sends a signal to the compensation loop, and the lift cylinder devices with small displacement values are compensated through the corresponding electromagnetic valve action in the compensation loop.

3. The adjustable slag line tundish lifting hydraulic control method according to claim 1, characterized in that: when the tundish ascends, the electric control cabinet controls an electromagnet Y2B of the first electromagnetic reversing valve to be electrified, high-pressure oil from a pressure oil port P0 of the hydraulic station enters through a port P of the first electromagnetic reversing valve and flows out from a port A, flow rate adjustment is carried out through the first oil inlet throttling valve, the high-pressure oil enters into a port A of a balance valve in a lifting loop and flows out from a port B of the balance valve, the high-pressure oil enters into a port A of a synchronous motor, the synchronous motor equally distributes hydraulic oil to the ports, the hydraulic oil respectively enters into safety valve devices communicated with the lifting oil cylinder devices, the hydraulic oil flows into ports a of hydraulic control one-way valves of the safety valve devices and flows out from ports B, and the hydraulic oil enters into piston cavities of the lifting oil cylinder devices through ports H of the safety valve devices;

4. The adjustable slag line tundish lifting hydraulic control method according to claim 1, characterized in that: when the tundish descends, the electric control cabinet controls an electromagnet Y2A of the first electromagnetic reversing valve to be electrified, high-pressure oil from a pressure oil port P0 of the hydraulic station enters through a port P of the first electromagnetic reversing valve and flows out from a port B, the flow rate is adjusted through a second oil inlet throttling valve, enters into a port A of the two-way logic cartridge valve and flows out from the port B, then respectively enters into ports B of safety valve devices communicated with the lift cylinder devices, flows out from ports R of the safety valve devices and enters into piston rod cavities of the lift cylinder devices;

at the moment, the oil in the piston cavity of each lift cylinder device enters an H port of a safety valve device and flows in through a B port of a hydraulic control one-way valve in each safety valve device, under the condition that a high-pressure oil exists in a B port of a safety valve device connected with an X port of the hydraulic control one-way valve, the oil entering from the B port of the hydraulic control one-way valve can flow out from the a port and flow out from an A port of each safety valve device, the entering oil is uniformly distributed to each port through a synchronous motor and then flows out from an A port of the synchronous motor to enter a B port of a balance valve in a lifting loop, the B port of a two-way logic cartridge valve connected with the X port of the balance valve is the high-pressure oil, the oil entering from the B port of the balance valve can flow out from the A port, flows through a first throttling valve to enter the A port of a first oil inlet valve and then flows out from a T port of the first oil inlet valve to enter an oil return port T0 of a hydraulic station, and the tundish descending action is completed.

5. The hydraulic control method for lifting of the tundish of the adjustable slag line according to claim 1, is characterized in that: when the tundish rises in a slag adjusting line, the electric control cabinet controls an electromagnet Y1B of a second electromagnetic directional valve to be electrified, high-pressure oil from a pressure oil port P0 of the hydraulic station enters through a port P of the second electromagnetic directional valve and flows out from a port A, flow rate adjustment is carried out through a third oil inlet throttling valve, the high-pressure oil flows through a second one-way valve and then enters a port A of a synchronous motor, the synchronous motor distributes the hydraulic oil uniformly, then the hydraulic oil respectively enters a port A of each safety valve device communicated with the lifting oil cylinder device, flows in from a port a of a hydraulic control one-way valve of each safety valve device and flows out from a port B, and the hydraulic oil enters a piston cavity of each lifting oil cylinder device through an H port of each safety valve device;

6. The adjustable slag line tundish lifting hydraulic control method according to claim 1, characterized in that: when the slag adjusting line of the tundish descends, the electric control cabinet controls an electromagnet Y1A of the second electromagnetic directional valve to be electrified, high-pressure oil enters through a P port of the second electromagnetic directional valve and flows out through a B port, enters an X port of the two-way logical cartridge valve to close the A port and the B port of the two-way logical cartridge valve, performs flow rate adjustment through a fourth oil inlet throttle valve, flows through a third one-way valve, respectively enters into the B ports of safety valve devices communicated with the lifting oil cylinder devices, flows out through R ports of the safety valve devices and enters into piston rod cavities of the lifting oil cylinder devices;

at the moment, oil in the piston cavity of each lifting oil cylinder device enters an H port of each safety valve device and flows in through a B port of each corresponding hydraulic control one-way valve, at the moment, an X port of the hydraulic control one-way valve is connected with a B port of each safety valve device to form high-pressure oil, so that the oil entering from the B port of the hydraulic control one-way valve can flow out from an a port and flow out from an A port of each safety valve device, respectively enters each port of a synchronous motor, is uniformly distributed by the synchronous motor, then flows out from an A port of the synchronous motor and enters a B port of a balance valve, at the moment, the B port of a two-way logic cartridge valve connected with the X port of the balance valve is the high-pressure oil, so that the oil entering from the B port of the balance valve can flow out from the A port and flows into the A port of a first electromagnetic directional valve through a first oil inlet throttle valve, then flows out from a T port of the first electromagnetic directional valve and enters an oil return port T0 of a hydraulic station, and the descending action of a tundish slag adjusting line is completed.

7. The adjustable slag line tundish lifting hydraulic control method according to claim 2, characterized in that: the compensation loop comprises a plurality of electromagnetic reversing valves, each safety valve device is communicated with one electromagnetic reversing valve, a P port of each electromagnetic reversing valve is communicated with an A port of a main electromagnetic reversing valve, a T port of each electromagnetic reversing valve is communicated with an oil return port T0 of the hydraulic station, and the P port and the T port of the main electromagnetic reversing valve are respectively communicated with a pressure oil port P0 and an oil return port T0 of the hydraulic station;

when the lifting oil cylinder device is compensated, the electric control cabinet controls the electromagnet Y of the main electromagnetic reversing valve to be electrified, the electromagnet Y of the electromagnetic reversing valve corresponding to the lifting oil cylinder device to be compensated is electrified, high-pressure oil from the pressure oil port P0 of the hydraulic station enters from the port P of the main electromagnetic reversing valve and flows out from the port A, enters into the port P of the corresponding electromagnetic reversing valve and flows out from the port PA, enters into the port PA of the corresponding safety valve device, passes through the one-way valve in the safety valve device and enters into the piston cavity of the lifting oil cylinder device to be compensated, the displacement compensation of the lifting oil cylinder device is increased to the same displacement value as that of the rest lifting oil cylinder devices, at the moment, the electromagnet Y of the main electromagnetic reversing valve is deenergized, the electromagnet Y of the corresponding electromagnetic reversing valve is deenergized, the high-pressure oil stops entering into the piston cavity of the lifting oil cylinder to be compensated, and the compensation action is finished.

8. The adjustable slag line tundish lifting hydraulic control method according to claim 3 or 4, characterized in that: in the whole process of ascending or descending the tundish, the X port of the two-way logic cartridge valve is connected with the B port of the second electromagnetic reversing valve, and the B port of the second electromagnetic reversing valve is communicated with the T port of the second electromagnetic reversing valve and is connected with an oil return port T0 from a hydraulic station, so that the A port and the B port of the two-way logic cartridge valve are kept in a communicated state, and oil is allowed to freely flow; the third one-way valve isolates the port B of the two-way logic cartridge valve from the port B of the second electromagnetic directional valve, so that oil from a piston rod cavity of each lift cylinder device or the two-way logic cartridge valve cannot enter the port T through the port B of the second electromagnetic directional valve and enter an oil return port T0 from a hydraulic station; the second one-way valve isolates the port B of the balance valve from the port A of the second electromagnetic reversing valve, so that oil from the port A of the balance valve or the port A of the synchronous motor cannot enter the port T through the port A of the second electromagnetic reversing valve and enter the oil return port T0 of the hydraulic station, and the ascending or descending action of the tundish is not influenced by the second electromagnetic reversing valve.

9. The hydraulic control method for lifting of the tundish of the adjustable slag line according to claim 5, characterized in that: in the process of ascending the slag regulating line of the whole tundish, the X port of the two-way logic cartridge valve is connected with the B port of the second electromagnetic reversing valve, the B port of the second electromagnetic reversing valve is communicated with the T port of the second electromagnetic reversing valve and is connected with an oil return port T0 of a hydraulic station, so that the A port and the B port of the two-way logic cartridge valve are respectively kept in a communicated state, and oil is allowed to freely flow;

10. The hydraulic control method for lifting of the tundish of the adjustable slag line according to claim 6, characterized in that: in the process of descending of a slag regulating line of the whole tundish, the X port of the two-way logic cartridge valve is connected with the B port of the second electromagnetic directional valve, the B port of the second electromagnetic directional valve is communicated with the P port of the second electromagnetic directional valve and is connected with the pressure oil port P0 of the hydraulic station, so that the A port and the B port of the two-way logic cartridge valve are kept in a closed state, and oil cannot flow to the A port from the B port of the two-way logic cartridge valve and enters the B port of the first electromagnetic directional valve through the second throttling oil inlet valve and then enters the oil return port T0 from the hydraulic station;