CN109322863B - Continuous casting ladle long nozzle manipulator hydraulic system and use method thereof - Google Patents
Continuous casting ladle long nozzle manipulator hydraulic system and use method thereof Download PDFInfo
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- CN109322863B CN109322863B CN201811436695.2A CN201811436695A CN109322863B CN 109322863 B CN109322863 B CN 109322863B CN 201811436695 A CN201811436695 A CN 201811436695A CN 109322863 B CN109322863 B CN 109322863B
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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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The application provides a continuous casting ladle long nozzle manipulator hydraulic system and a use method thereof, wherein the long nozzle manipulator hydraulic system comprises: the high-pressure oil port is used for providing high-pressure oil for the hydraulic system; the lifting oil cylinder comprises a rod cavity and a rodless cavity and is used for implementing an action instruction of the hydraulic system; the oil inlet of the manual reversing valve is communicated with the high-pressure oil port, and the first oil supply port of the manual reversing valve is communicated with a rod cavity of the lifting oil cylinder through a rod cavity pipeline; the rodless cavity of the lifting oil cylinder is communicated with the high-pressure oil port through a rodless cavity pipeline; the energy accumulator is respectively communicated with the rodless cavity and the oil return port; according to the application, the original three-way pressure reducing valve is directly removed, the volume of the accumulator is increased, so that the rodless cavity oil inlet and oil return of the lifting oil cylinder are completely provided by the accumulator, and two normally closed high-pressure ball valves are added to charge and discharge the accumulator; the hydraulic system has low failure rate and high safety performance, reduces the frequency of replacing the three-way pressure reducing valve, and saves the cost.
Description
Technical Field
The application belongs to the technical field of metallurgical equipment, and particularly relates to a continuous casting ladle long nozzle manipulator hydraulic system and a use method thereof.
Background
The continuous casting ladle long nozzle manipulator is an important device for fixing a large ladle long nozzle so that molten steel can be normally introduced into a tundish. The manipulator is driven by a hydraulic system to finish the action, the manipulator can smoothly center the long nozzle on the ladle sliding nozzle, the manipulator does not act after centering, but the ladle arm at the casting position still continues to descend, the bottom end of the long nozzle is pressed into the molten steel in the tundish, and the quality of the molten steel is ensured, so that the lifting cylinder of the manipulator must achieve the effect of following the ladle.
The existing manipulator hydraulic system repeatedly breaks down in the using process, so that the large ladle casting fails. In the actual working condition, the weight of the molten steel added on the ladle is approximately 130 tons, the molten steel fully acts on the long-nozzle lifting oil cylinder, the three-way pressure reducing valve has larger load in the long-term use process of the original hydraulic system, and particularly, when the long-nozzle oil cylinder is forced to descend under the influence of the load, the rodless cavity fully depends on the three-way pressure reducing valve to overflow and return oil. The volume of the accumulator is too small, the pressure absorption effect is not large, the influence of the field working environment and oil quality is added, the failure probability of the three-way pressure reducing valve is increased, no rod cavity is left for pressure maintaining in the working process of the long water gap oil cylinder, and the long water gap falls off under the condition of dead weight, so that a serious safety accident is generated.
Therefore, there is a need to provide a continuous casting ladle long nozzle manipulator hydraulic system and a use method thereof, which address the shortcomings of the prior art.
Disclosure of Invention
The application aims to provide a continuous casting ladle long nozzle manipulator hydraulic system and a use method thereof, which at least solve the problems of high failure probability and high failure rate of a three-way pressure reducing valve of the existing hydraulic system.
In order to achieve the above object, the present application provides the following technical solutions:
preferably, the long water gap manipulator hydraulic system of continuous casting ladle comprises:
the high-pressure oil port is used for providing high-pressure oil for the hydraulic system;
the lifting oil cylinder comprises a rod cavity and a rodless cavity and is used for implementing the action instruction of the hydraulic system;
the oil inlet of the manual reversing valve is communicated with the high-pressure oil port, and the first oil supply port of the manual reversing valve is communicated with a rod cavity of the lifting oil cylinder through a rod cavity pipeline; the rodless cavity of the lifting oil cylinder is communicated with the high-pressure oil port through a rodless cavity pipeline;
the energy accumulator is respectively communicated with the rodless cavity and the oil return port;
the lifting oil cylinder, the rod cavity pipeline, the rodless cavity pipeline, the energy accumulator, the oil return port and the high-pressure oil port form a long water gap manipulator hydraulic circuit.
According to the continuous casting ladle long nozzle manipulator hydraulic system, preferably, the rod cavity pipeline is further provided with the hydraulic control one-way valve, the first one-way throttle valve, the second one-way throttle valve and the third ball valve; the hydraulic control one-way valve is positioned between the manual reversing valve and the lifting oil cylinder; the third ball valve is positioned at the front end of the lifting oil cylinder; the first one-way throttle valve is positioned at the rear end of the hydraulic control one-way valve, and the second one-way throttle valve is positioned between the first one-way throttle valve and the third ball valve.
According to the hydraulic system for the continuous casting ladle long nozzle manipulator, preferably, the rodless cavity pipeline is further provided with the fourth ball valve and the first ball valve, the fourth ball valve is arranged in parallel with the third ball valve, and the fourth ball valve is close to the lifting oil cylinder; the first ball valve is far away from the lifting oil cylinder and is located between the fourth ball valve and the end part of the rodless cavity.
The hydraulic system of the continuous casting ladle long nozzle manipulator preferably further comprises a pressure measuring pipeline and an energy storage pipeline, wherein the first end of the pressure measuring pipeline is communicated with the oil return port, and the second end of the pressure measuring pipeline is connected with a pressure gauge; a second ball valve is arranged between the first end of the pressure measuring pipeline and the pressure gauge, and the second ball valve is arranged in parallel with the first ball valve; one end of the energy storage pipeline is connected to the rodless cavity pipeline, the connection part of the energy storage pipeline and the rodless cavity pipeline is positioned between the first ball valve and the fourth ball valve, and the other end of the energy storage pipeline is connected with an energy accumulator;
preferably, the energy storage pipeline and the pressure measuring pipeline are communicated between the second ball valve and the pressure gauge.
In the continuous casting ladle long nozzle manipulator hydraulic system, preferably, the first oil supply port of the manual reversing valve is communicated with the main oil port of the hydraulic control one-way valve, and the second oil supply port of the manual reversing valve is communicated with the oil drain port of the hydraulic control one-way valve.
In the continuous casting ladle long nozzle manipulator hydraulic system, preferably, a first pressure measuring head is further arranged on the rod cavity pipeline, and the first pressure measuring head is positioned between the third ball valve and the second one-way throttle valve; the rodless cavity pipeline is also provided with a second pressure measuring head, and the second pressure measuring head is positioned between the fourth ball valve and the first ball valve;
preferably, the first pressure measuring head is arranged in parallel with the second pressure measuring head.
In the continuous casting ladle long nozzle manipulator hydraulic system, preferably, the first one-way throttle valve is formed by connecting a first one-way valve and a first throttle valve in parallel, and the second one-way throttle valve is formed by connecting a second one-way valve and a second throttle valve in parallel; the circulation direction of the first one-way valve is the direction from the rod cavity of the lifting oil cylinder to the high-pressure oil port; the circulation direction of the second one-way valve is the direction from the high-pressure oil port to the rod cavity of the lifting oil cylinder.
The application also provides a using method of the continuous casting ladle long nozzle manipulator hydraulic system, and preferably, the using method comprises the following steps:
step one, lifting the lifting cylinder:
when the lifting oil cylinder performs lifting action, the fourth ball valve is kept in an open state, the energy accumulator is communicated with the rodless cavity of the lifting oil cylinder to supply pressure for lifting of the lifting oil cylinder, meanwhile, the manual reversing valve is pushed to the position b, high-pressure oil provided by the high-pressure oil port is used as control oil of the hydraulic control one-way valve, the hydraulic control one-way valve is opened, the upper cavity of the lifting oil cylinder is communicated with the oil return port to form a loop, and lifting action is completed;
step two, the descending action of the lifting oil cylinder:
when the lifting oil cylinder descends, the first ball valve and the second ball valve are closed, the manual reversing valve is pushed to the position a, the high-pressure oil port is communicated with a rod cavity of the lifting oil cylinder, and the energy accumulator is communicated with a rodless cavity of the lifting oil cylinder; the oil in the lower cavity is forced to return to the accumulator through the pressure difference between the upper cavity and the lower cavity of the lifting oil cylinder, so that the descending action is completed;
step three, the following action of the lifting oil cylinder:
when the lifting oil cylinder is in follow-up, external pressure acts on a piston rod of the lifting oil cylinder, the upper cavity of the lifting oil cylinder automatically sucks oil in an oil pipe of an oil return port, and the oil in the lower cavity approaches the accumulator, so that follow-up action is completed.
According to the application method of the continuous casting ladle long nozzle manipulator hydraulic system, preferably, the accumulator is charged before the first step, the fourth ball valve and the second ball valve are closed during charging, the first ball valve is opened, the manual reversing valve is pushed to the middle position, the high-pressure oil port charges the accumulator, the scale change of the pressure gauge is noted during the charging process, and the charging is stopped when the pressure of the accumulator reaches 10-13 Mpa, so that the action requirement is met.
In the use method of the continuous casting ladle long nozzle manipulator hydraulic system, preferably, the lifting oil cylinder is throttled by the first one-way throttle valve when in ascending motion, and is throttled by the second one-way throttle valve when in descending motion.
Compared with the closest prior art, the technical scheme provided by the application has the following excellent effects:
according to the application, the original three-way pressure reducing valve is directly removed, the volume of the accumulator is increased, so that the rodless cavity oil inlet and oil return of the lifting oil cylinder are completely provided by the accumulator, and two normally closed high-pressure ball valves are added to charge and discharge the accumulator; the hydraulic system provided by the application has the advantages of low failure rate and high safety performance, reduces the frequency of replacing the three-way pressure reducing valve, and saves the cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
FIG. 1 is a schematic diagram of a hydraulic system of a continuous casting ladle long nozzle manipulator according to an embodiment of the application;
fig. 2 is a schematic diagram of a hydraulic system of a manipulator for a long nozzle of a continuous casting ladle in the prior art.
In the figure: 1. a lifting oil cylinder; 2. a high-pressure oil port; 3. an oil return port; 4. a manual reversing valve; 5. a hydraulically controlled one-way valve; 6. a first one-way throttle valve; 7. a second one-way throttle valve; 8. a first pressure head; 9. a third ball valve; 10. a first ball valve; 11. a second pressure head; 12. a fourth ball valve; 13. a pressure gauge; 14. an accumulator; 15. a second ball valve; 16. an energy storage pipeline; 17. a pressure measuring pipeline; 18. a rodless cavity pipeline; 19. a rod cavity pipeline; 20. a three-way pressure reducing valve; 41. an oil inlet; 42. a first oil supply port; 43. a second oil supply port; 44. a third oil supply port; 51. and (5) an oil drain port.
Detailed Description
The application will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present application and do not require that the present application must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
As shown in fig. 2, which is a working schematic diagram of the original hydraulic system in the prior art, the lifting process of the piston column of the lift cylinder 1 is:
the system pressure is set to be 180Mpa, the pressure of the three-way pressure reducing valve 20 is adjusted to be 10Mpa, and the lifting action requirement of the lifting oil cylinder 1 is met. When the lifting action is carried out, the manual reversing valve 4 is pushed to the position b, high-pressure oil provided by the high-pressure oil port 2 is decompressed through the three-way pressure reducing valve 20 and then enters the rodless cavity of the lifting oil cylinder 1, and on the other hand, the high-pressure oil is used as control oil of the hydraulic control one-way valve 5 to open the hydraulic control one-way valve 5, and the rod cavity of the lifting oil cylinder 1 is communicated with the oil return port 3 to form a loop.
The lowering process of the lifting oil cylinder 1 at this time is as follows:
when the manual reversing valve 4 is pushed to the position a, high-pressure oil provided by the high-pressure oil port 2 passes through the reversing valve and enters the rod cavity of the lifting oil cylinder 1, and as the pressure is regulated to be 10MPa by the three-way pressure reducing valve 20, the rodless cavity of the lifting oil cylinder 1 returns oil through the three-way pressure reducing valve 20, and the lifting oil cylinder 1 descends.
The following process of the lifting oil cylinder 1 is as follows:
after the centering of the long water gap is finished, the manual reversing valve 4 is changed to return to the middle position, the rodless cavity of the lifting oil cylinder 1 is communicated with the high-pressure oil port 2 to enable the long water gap to be clung to the ladle steel outlet, meanwhile, the ladle arm starts to perform descending action, the lifting oil cylinder 1 with the long water gap is forced to descend under the action of great external force due to the action of pressure difference, oil inlet of the rod cavity is provided by self-priming of the one-way valve from the oil return port 3, and the rodless cavity end of the lifting oil cylinder 1 is communicated with the oil return port 3 through the three-way pressure reducing valve 20 to form a loop.
In the prior art, the original hydraulic system is well used in the initial use stage, but after a period of use, the long nozzle lifting oil cylinder 1 is frequently in the casting process without rod cavity pressure loss, so that the long nozzle is separated from a ladle tapping hole to form open casting, the quality of molten steel is seriously influenced, and the casting is forced to stop.
Through analysis, as the flow rate through the three-way pressure reducing valve 20 increases when the pressure is reduced, the larger the opening of the main valve of the three-way pressure reducing valve 20 (the overflow amount of the overflow channel can be basically ignored), the pressure drop becomes smaller, so the output pressure of the three-way pressure reducing valve 20 becomes smaller (relative to the set value); when the load rises, the opening of the three-way pressure reducing valve 20 becomes smaller, the pressure drop becomes larger, and when the flow of the load end 0 is output, the tiny flow passing through the three-way pressure reducing valve 20 can overflow from the overflow path, which is one of the main reasons for heating of the three-way pressure reducing valve 20, and the pressure reducing output is a real set value. When external interference occurs at the load end and the load end suddenly increases, the main valve core of the three-way pressure reducing valve 20 can further move, the high-pressure oil port 2 is changed into the three-way overflow valve from the three-way overflow valve to the oil return port 3, overflow oil return occurs at the moment, the flow of the overflow oil can be far greater than the overflow quantity of the overflow path of the pilot pressure reducing control, and the overflow pressure can be increased along with the increase of the flow.
In the actual working condition, the weight of the large ladle added with molten steel is approximately 130 tons, the large ladle is completely acted on the long-nozzle lifting oil cylinder 1, the three-way pressure reducing valve 20 has a larger load in the long-term use process of the original hydraulic system in the prior art, and particularly, when the long-nozzle oil cylinder is forced to descend under the influence of the load, the rodless cavity completely overflows and returns oil by the three-way pressure reducing valve 20. The volume of the accumulator 14 is too small, the pressure absorption effect is not large, the influence of the field working environment and the oil quality is added, the failure probability of the three-way pressure reducing valve 20 is increased, no rod cavity is left for pressure maintaining in the working process of the long water gap oil cylinder, and the long water gap falls off under the condition of dead weight.
In order to overcome the technical defects of the hydraulic system in the prior art, as shown in fig. 1, a specific embodiment of the application provides a hydraulic system of a continuous casting ladle long nozzle manipulator, which comprises: the high-pressure oil port 2 is used for providing high-pressure oil for the hydraulic system; the lifting oil cylinder 1 comprises a rod cavity and a rodless cavity, and is used for implementing an action instruction of a hydraulic system; the manual reversing valve 4, an oil inlet 41 of the manual reversing valve 4 is communicated with the high-pressure oil port 2, and a first oil supply port 42 of the manual reversing valve 4 is communicated with a rod cavity of the lifting oil cylinder 1 through a rod cavity pipeline 19; the rodless cavity of the lifting oil cylinder 1 is communicated with the high-pressure oil port 2 through a rodless cavity pipeline 18; the energy accumulator 14, the energy accumulator 14 is communicated with the rodless cavity and the oil return port 3 respectively; the lifting oil cylinder 1, the rod cavity pipeline 19, the rodless cavity pipeline 18, the energy accumulator 14, the oil return port 3 and the high-pressure oil port 2 form a long water gap manipulator hydraulic circuit.
According to the specific embodiment of the application, the rod cavity pipeline 19 is also provided with a hydraulic control one-way valve 5, a first one-way throttle valve 6, a second one-way throttle valve 7 and a third ball valve 9; the hydraulic control one-way valve 5 is positioned between the manual reversing valve 4 and the lifting oil cylinder 1; the third ball valve 9 is positioned at the front end of the lifting oil cylinder 1; the first one-way throttle valve 6 is positioned at the rear end of the hydraulic control one-way valve 5, and the second one-way throttle valve 7 is positioned between the first one-way throttle valve 6 and the third ball valve 9. The rodless cavity pipeline 18 is also provided with a fourth ball valve 12 and a first ball valve 10, the fourth ball valve 12 is arranged in parallel with the third ball valve 9, and the fourth ball valve 12 is close to the lifting oil cylinder 1; the first ball valve 10 is remote from the lift cylinder 1 and the first ball valve 10 is located between the fourth ball valve 12 and the end of the rodless cavity.
According to the specific embodiment of the application, the long nozzle manipulator hydraulic system further comprises a pressure measuring pipeline 17 and an energy storage pipeline 16, wherein a first end of the pressure measuring pipeline 17 is communicated with the oil return port 3, and a second end of the pressure measuring pipeline 17 is connected with a pressure gauge 13; a second ball valve 15 is arranged between the first end of the pressure measuring pipeline 17 and the pressure gauge 13, the second ball valve 15 is arranged in parallel with the first ball valve 10, one end of the energy storage pipeline 16 is connected to the rodless cavity pipeline 18, the joint of the energy storage pipeline 16 and the rodless cavity pipeline 18 is positioned between the first ball valve 10 and the fourth ball valve 12, and the other end of the energy storage pipeline 16 is connected with the energy accumulator 14; the energy storage pipeline 16 and the pressure measuring pipeline 17 are communicated between the second ball valve 15 and the pressure gauge 13. The first oil supply port 42 of the manual reversing valve 4 is communicated with the main oil port of the hydraulic control one-way valve 5, and the second oil supply port 43 of the manual reversing valve 4 is communicated with the oil drain port 51 of the hydraulic control one-way valve 5. The third oil supply port 44 communicates with the oil return port 3.
According to the specific embodiment of the application, a first pressure measuring head 8 is further arranged on the rod cavity pipeline 19, and the first pressure measuring head 8 is positioned between the third ball valve 9 and the second one-way throttle valve 7; the rodless cavity pipeline 18 is also provided with a second pressure measuring head 11, and the second pressure measuring head 11 is positioned between the fourth ball valve 12 and the first ball valve 10; preferably, the first measuring head 8 is arranged parallel to the second measuring head 11. The first one-way throttle valve 6 is formed by connecting a first one-way valve and a first throttle valve in parallel, and the second one-way throttle valve 7 is formed by connecting a second one-way valve and a second throttle valve in parallel; the circulation direction of the first one-way valve is the direction from the rod cavity of the lifting oil cylinder 1 to the high-pressure oil port 2; the circulation direction of the second one-way valve is the direction from the high-pressure oil port 2 to the rod cavity of the lifting oil cylinder 1.
According to a specific embodiment of the application, a use method of a continuous casting ladle long nozzle manipulator hydraulic system comprises the following steps:
step one, lifting the lifting cylinder:
when the lifting oil cylinder 1 performs lifting action, the fourth ball valve 12 is kept in an open state, the energy accumulator 14 is communicated with a rodless cavity of the lifting oil cylinder 1 to supply pressure for lifting the lifting oil cylinder 1, meanwhile, the manual reversing valve 4 is pushed to the position b, high-pressure oil provided by the high-pressure oil port 2 is used as control oil of the hydraulic control one-way valve 5, the hydraulic control one-way valve 5 is opened, the upper cavity of the lifting oil cylinder 1 is communicated with the oil return port 3 to form a loop, and lifting action is completed;
step two, the descending action of the lifting oil cylinder:
when the lifting oil cylinder descends, the first ball valve 10 and the second ball valve 15 are closed, the manual reversing valve 4 is pushed to the position a, the high-pressure oil port 2 is communicated with a rod cavity of the lifting oil cylinder 1, and the energy accumulator 14 is communicated with a rodless cavity of the lifting oil cylinder 1; the oil in the lower cavity is forced to return to the accumulator 14 by the pressure difference between the upper cavity and the lower cavity of the lifting oil cylinder 1, so as to finish the descending action;
step three, the following action of the lifting oil cylinder:
when the lifting oil cylinder is in follow-up, external pressure acts on a piston rod of the lifting oil cylinder 1, the upper cavity of the lifting oil cylinder 1 automatically sucks oil in an oil pipe of the oil return port 3, and the oil in the lower cavity is forced to return to the accumulator 14, so that follow-up action is completed.
Before the first step, the accumulator 14 is charged, the fourth ball valve 12 and the second ball valve 15 are closed during charging, the first ball valve 10 is opened, the manual reversing valve 4 is pushed to the middle position, the high-pressure oil port 2 charges the accumulator 14, the scale change of the pressure gauge 13 is noticed at the moment in the charging process, and the charging is stopped when the pressure of the accumulator 14 reaches 10-13 Mpa, so that the action requirement is met. The lifting oil cylinder is throttled by the first one-way throttle valve 6 when in ascending motion, and throttled by the second one-way throttle valve 7 when in descending motion.
According to the embodiment of the application, the three-way pressure reducing valve 20 has high precision requirement on oil and is relatively expensive compared with a reversing valve, so that the original three-way pressure reducing valve 20 is directly removed, the volume of the accumulator 14 is increased, the oil inlet and the oil return of the rodless cavity are completely provided by the accumulator 14, the pressure is supplied by the accumulator 14 when the lifting oil cylinder 1 ascends, the oil return is pressed back to the accumulator 14 by the pressure difference between the system pressure and the pressure of the accumulator 14 when the lifting oil cylinder 1 descends, and the oil return is pressed back to the accumulator 14 by load external force when the lifting oil cylinder is driven. And two normally closed high-pressure ball valves are additionally arranged to perform the functions of pressurizing and depressurizing the energy accumulator 14, and the area ratio of the rod cavity to the rodless cavity is calculated to pre-charge 10-13 MPa, so that the action requirement is met. It should be noted that the indication of the pressure gauge 13 should be paid attention to when the pressure is increased, and the pressure is not equal to the system pressure, and the rod cavity area is smaller than the rodless cavity area, so that the descending action cannot be performed. Meanwhile, according to the actual working condition of the site, if the condition is met, the accumulator 14 can be additionally provided with a safety overflow valve, so that the safety of the accumulator 14 is improved, and the working stability of the hydraulic circuit is ensured.
According to the embodiment of the application, aiming at the defects of the existing system, the three-way pressure reducing valve 20 has larger load, particularly when the long nozzle lifting oil cylinder 1 is forced to descend under the influence of the load, the rodless cavity completely overflows and returns oil by the three-way pressure reducing valve 20, the probability of failure of the three-way pressure reducing valve 20 is increased under the influence of the field working environment and the oil quality, so that the rodless cavity does not maintain pressure during the working of the long nozzle lifting oil cylinder 1, and the long nozzle falls off under the condition of dead weight and other faults. Because the three-way pressure reducing valve 20 has high requirement on the precision of oil and is relatively expensive compared with a reversing valve, the original three-way pressure reducing valve 20 is directly removed, the volume of the energy accumulator 14 is increased, and the oil inlet and the oil return of the rodless cavity of the lifting oil cylinder 1 are completely provided by the energy accumulator 14. The pressure is supplied by the accumulator 14 during rising, the return oil is pressed back to the accumulator 14 by the pressure difference between the system pressure and the pressure of the accumulator 14 during falling, and the return oil is pressed back to the accumulator 14 by load external force during follow-up. Two normally-closed high-pressure ball valves are additionally arranged to play roles in pressurizing and releasing the pressure of the energy accumulator 14;
in summary, the original three-way pressure reducing valve 20 is directly removed and the volume of the energy accumulator 14 is increased, so that the rodless cavity oil inlet and oil return of the lifting oil cylinder 1 are completely provided by the energy accumulator 14, and two normally closed high-pressure ball valves are added to charge and discharge the energy accumulator 14; the hydraulic system provided by the application has the advantages of low failure rate and high safety performance, reduces the frequency of replacing the three-way pressure reducing valve 20, and saves the cost. The improved system is simpler and clearer, the manufacturing cost is lower, and the maintenance is more convenient. The control loop enables the accumulator 14 to play a role more widely, and is a great innovation application. After the application is implemented on site, the number of faults of the hydraulic system is greatly reduced, the production efficiency is improved, and the cost is reduced.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The application method of the continuous casting ladle long nozzle manipulator hydraulic system is characterized in that the long nozzle manipulator hydraulic system of the continuous casting ladle long nozzle manipulator hydraulic system comprises the following steps:
the high-pressure oil port is used for providing high-pressure oil for the hydraulic system;
the lifting oil cylinder comprises a rod cavity and a rodless cavity and is used for implementing the action instruction of the hydraulic system;
the oil inlet of the manual reversing valve is communicated with the high-pressure oil port, and the first oil supply port of the manual reversing valve is communicated with a rod cavity of the lifting oil cylinder through a rod cavity pipeline; the rodless cavity of the lifting oil cylinder is communicated with the high-pressure oil port through a rodless cavity pipeline;
the energy accumulator is respectively communicated with the rodless cavity and the oil return port;
the lifting oil cylinder, the rod cavity pipeline, the rodless cavity pipeline, the energy accumulator, the oil return port and the high-pressure oil port form a long water gap manipulator hydraulic loop;
the rod cavity pipeline is also provided with a hydraulic control one-way valve, a first one-way throttle valve, a second one-way throttle valve and a third ball valve; the hydraulic control one-way valve is positioned between the manual reversing valve and the lifting oil cylinder; the third ball valve is positioned at the front end of the lifting oil cylinder; the first one-way throttle valve is positioned at the rear end of the hydraulic control one-way valve, and the second one-way throttle valve is positioned between the first one-way throttle valve and the third ball valve;
the rodless cavity pipeline is also provided with a fourth ball valve and a first ball valve, the fourth ball valve and the third ball valve are arranged in parallel, and the fourth ball valve is close to the lifting oil cylinder; the first ball valve is far away from the lifting oil cylinder, and the fourth ball valve is positioned between the first ball valve and the end part of the rodless cavity;
the long nozzle manipulator hydraulic system further comprises a pressure measuring pipeline and an energy storage pipeline, wherein a first end of the pressure measuring pipeline is communicated with the oil return port, and a second end of the pressure measuring pipeline is connected with a pressure gauge; a second ball valve is arranged between the first end of the pressure measuring pipeline and the pressure gauge, and the second ball valve is arranged in parallel with the first ball valve; one end of the energy storage pipeline is connected to the rodless cavity pipeline, the connection part of the energy storage pipeline and the rodless cavity pipeline is positioned between the first ball valve and the fourth ball valve, and the other end of the energy storage pipeline is connected with an energy accumulator;
the using method comprises the following steps:
step one, lifting the lifting cylinder:
when the lifting oil cylinder performs lifting action, the fourth ball valve is kept in an open state, the energy accumulator is communicated with the rodless cavity of the lifting oil cylinder to supply pressure for lifting of the lifting oil cylinder, meanwhile, the manual reversing valve is pushed to the position b, high-pressure oil provided by the high-pressure oil port is used as control oil of the hydraulic control one-way valve, the hydraulic control one-way valve is opened, the upper cavity of the lifting oil cylinder is communicated with the oil return port to form a loop, and lifting action is completed;
step two, the descending action of the lifting oil cylinder:
when the lifting oil cylinder descends, the first ball valve and the second ball valve are closed, the manual reversing valve is pushed to the position a, the high-pressure oil port is communicated with a rod cavity of the lifting oil cylinder, and the energy accumulator is communicated with a rodless cavity of the lifting oil cylinder; the oil in the lower cavity is forced to return to the accumulator through the pressure difference between the upper cavity and the lower cavity of the lifting oil cylinder, so that the descending action is completed;
step three, the following action of the lifting oil cylinder:
when the lifting oil cylinder is in follow-up, external pressure acts on a piston rod of the lifting oil cylinder, the upper cavity of the lifting oil cylinder automatically sucks oil in an oil pipe of an oil return port, and the oil in the lower cavity approaches the accumulator, so that follow-up action is completed.
2. The method for using the continuous casting ladle long nozzle manipulator hydraulic system according to claim 1, wherein the energy storage pipeline and the pressure measuring pipeline are communicated between the second ball valve and the pressure gauge.
3. The method of using a continuous casting ladle long nozzle manipulator hydraulic system of claim 1, wherein a first oil supply port of the manual reversing valve is communicated with a main oil port of the hydraulic control one-way valve, and a second oil supply port of the manual reversing valve is communicated with an oil drain port of the hydraulic control one-way valve.
4. The method for using the continuous casting ladle long nozzle manipulator hydraulic system according to claim 1, wherein a first pressure measuring head is further arranged on the rod cavity pipeline and is positioned between the third ball valve and the second one-way throttle valve; the rodless cavity pipeline is further provided with a second pressure measuring head, and the second pressure measuring head is located between the fourth ball valve and the first ball valve.
5. The method for using the continuous casting ladle long nozzle manipulator hydraulic system according to claim 4, wherein the first pressure measuring head and the second pressure measuring head are arranged in parallel.
6. The method for using the continuous casting ladle long nozzle manipulator hydraulic system according to claim 1, wherein the first one-way throttle valve is formed by connecting a first one-way valve and a first throttle valve in parallel, and the second one-way throttle valve is formed by connecting a second one-way valve and a second throttle valve in parallel; the circulation direction of the first one-way valve is the direction from the rod cavity of the lifting oil cylinder to the high-pressure oil port; the circulation direction of the second one-way valve is the direction from the high-pressure oil port to the rod cavity of the lifting oil cylinder.
7. The method for using the continuous casting ladle long nozzle manipulator hydraulic system according to claim 1, wherein the accumulator is charged before the first step, the fourth ball valve and the second ball valve are closed during charging, the first ball valve is opened, the manual reversing valve is pushed to the middle position, the high-pressure oil port charges the accumulator, the scale change of the pressure gauge is noted at the moment of the charging process, and the charging is stopped when the pressure of the accumulator reaches 10-13 Mpa, so that the action requirement is met.
8. The method for using the continuous casting ladle long nozzle manipulator hydraulic system according to claim 1, wherein the lifting oil cylinder is throttled by a first one-way throttle valve when in ascending motion, and is throttled by a second one-way throttle valve when in descending motion.
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| JP2003112248A (en) * | 2001-10-04 | 2003-04-15 | Ube Techno Enji Kk | Injection method for die-casting machine |
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