CN114294275A - Hydraulic control system of walking beam furnace - Google Patents
Hydraulic control system of walking beam furnace Download PDFInfo
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- CN114294275A CN114294275A CN202111677403.6A CN202111677403A CN114294275A CN 114294275 A CN114294275 A CN 114294275A CN 202111677403 A CN202111677403 A CN 202111677403A CN 114294275 A CN114294275 A CN 114294275A
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- 239000010720 hydraulic oil Substances 0.000 claims abstract description 75
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- 238000004146 energy storage Methods 0.000 claims abstract description 6
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- 238000007599 discharging Methods 0.000 claims description 26
- 238000006073 displacement reaction Methods 0.000 claims description 22
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- 238000013461 design Methods 0.000 description 2
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Abstract
The invention discloses a hydraulic control system of a stepping heating furnace, which comprises a hydraulic oil tank, at least one group of execution assemblies, an energy storage group and an oil supplementing pump group, wherein each execution assembly comprises a pump group unit, a valve control unit and a hydraulic cylinder group, the hydraulic oil tank is sequentially communicated with the pump group unit, the valve control unit, the hydraulic cylinder group and the energy storage group to form a main flow passage of the hydraulic oil tank, and the oil supplementing pump group is communicated between the hydraulic oil tank and the valve control unit. The hydraulic system of the walking beam furnace solves the problems of low overall efficiency, serious energy waste and the like of the hydraulic system of the walking beam furnace, and also considers the synchronous control requirements of a plurality of hydraulic cylinders on the basis of overall energy conservation of the hydraulic system, has the characteristics of good energy-saving effect, low investment and operation cost, simple control and structure and the like, is an overall optimal energy-saving technology of the hydraulic system of the walking beam furnace, and is very suitable for being applied to control of equipment including a lifting mechanism of the walking beam furnace, a walking beam furnace and the like.
Description
Technical Field
The invention relates to the technical field of metallurgical equipment, in particular to a hydraulic control system of a walking beam furnace.
Background
The common walking beam furnace is generally driven and controlled by a plurality of hydraulic cylinders, and the hydraulic cylinders are mainly used for lifting and conveying heavy objects such as steel billets and the like, so as to meet the process control requirements of the walking beam furnace, wherein the hydraulic cylinders comprise a lifting hydraulic cylinder and a translation hydraulic cylinder of a furnace bottom machine, a hydraulic cylinder of a steel loading machine, a hydraulic cylinder of a steel discharging machine, a hydraulic cylinder of a charging furnace door, a hydraulic cylinder of a discharging furnace door and the like. The hydraulic cylinders are used for lifting and lowering dozens of tons or even thousands of tons of weight repeatedly, and the lifted object has large gravitational potential energy in the process of descending. In addition, the control of the hydraulic cylinders is based on the control principle of valve control throttling debugging, and the hydraulic cylinders have large throttling loss. At present, no related technology in the market can carry out energy-saving control on a plurality of objects such as furnace bottom machinery, a charging and discharging machine, furnace door lifting and the like, only a small amount of technology can recycle the gravitational potential energy of a furnace bottom mechanical lifting hydraulic cylinder, and a hydraulic system of the whole furnace area cannot be comprehensively considered, so that a plurality of systems are parallel, and the cost and the failure rate are increased; in addition, the existing energy-saving technology adopts a single-cavity control technology when an energy accumulator is used for energy recovery, and also needs to consider the problems of oil supplement of a rod cavity and the like, so that the volume of the energy accumulator is overlarge, and the cost and the failure rate are increased; the external steel machine, the steel tapping machine, the charging and discharging furnace door lifting and the like are respectively provided with two sets of hydraulic cylinders, the two sets of hydraulic cylinders need to be synchronously controlled during working, and the synchronous control is realized by adopting valve control throttling speed regulation control at present, so that the synchronous control of the working of the two sets of hydraulic cylinders cannot be realized.
Therefore, in order to solve the above problems, a hydraulic control system for a walking beam furnace is needed, all hydraulic cylinders adopt an energy-saving principle of combining pump-controlled volume speed regulation control and energy recovery of an energy accumulator, the problems of low overall efficiency, serious energy waste and the like of a hydraulic system of the walking beam furnace are solved, and in addition, on the basis of overall energy saving of the hydraulic system, the synchronous control requirements of a plurality of hydraulic cylinders are also considered by adopting a special volume speed regulation pump unit.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects in the prior art, and provide a hydraulic control system for a walking beam furnace, wherein all hydraulic cylinders adopt an energy saving principle of combining pump-controlled volume speed regulation control and energy recovery of an energy accumulator, so that the problems of low overall efficiency, serious energy waste and the like of the hydraulic system of the walking beam furnace are solved, and in addition, on the basis of overall energy saving of the hydraulic system, a special volume speed regulation pump unit is adopted to also meet the synchronous control requirements of a plurality of hydraulic cylinders. The invention has the characteristics of good energy-saving effect, low investment and operation cost, simple control and structure and the like, is an overall optimal energy-saving technology of the hydraulic system of the walking beam furnace, and is very suitable for controlling equipment such as a walking beam furnace lifting mechanism, a walking beam cooling bed and the like.
The hydraulic control system of the stepping heating furnace comprises a hydraulic oil tank, at least one group of execution assemblies, an energy accumulator group and an oil supplementing pump group, wherein each execution assembly comprises a pump group unit, a valve control unit and a hydraulic cylinder group, the hydraulic oil tank is sequentially communicated with the pump group unit, the valve control unit, the hydraulic cylinder group and the energy accumulator group to form a main flow passage of the hydraulic oil tank, and the oil supplementing pump group is communicated between the hydraulic oil tank and the valve control unit to be used as a spare of the pump group unit.
Furthermore, when the execution assemblies are in multiple groups, the multiple groups of execution assemblies are in parallel relation, so that the execution assemblies of each group are not interfered with each other.
Furthermore, the pump unit comprises a motor and at least two hydraulic pumps connected in series and is used for carrying out pump control debugging control on a hydraulic control system of the stepping heating furnace, the valve control unit comprises a plurality of hydraulic valves respectively communicated with the pump unit, the hydraulic valves are mutually connected in parallel, the hydraulic cylinder group comprises a plurality of hydraulic cylinders connected in parallel, and the plurality of hydraulic cylinders are correspondingly connected in series with the plurality of hydraulic valves one by one; at least one cavity of the hydraulic cylinder is communicated with the accumulator group indirectly or directly.
Further, the hydraulic valve is a plug-in hydraulic lock.
Further, the hydraulic cylinder is a furnace bottom mechanical lifting hydraulic cylinder, a furnace bottom mechanical translation hydraulic cylinder, a charging furnace door lifting hydraulic cylinder, a steel charging machine lifting hydraulic cylinder, a discharging furnace door lifting hydraulic cylinder or a tapping machine lifting hydraulic cylinder.
Further, the hydraulic pump in the pump unit has two pressure ports, one pressure port is communicated with the hydraulic cylinder group, and the other pressure port is communicated with the energy storage group.
Furthermore, the main control mode of the pump control debugging control is realized by controlling the rotating speed of a motor, controlling the displacement of a hydraulic pump, and controlling the motor steering and the displacement reversing of the hydraulic pump.
When the hydraulic lifting mechanism is put into operation, the whole hydraulic control system is connected according to needs, the hydraulic control system comprises hydraulic cylinders, a pump unit, an energy accumulator group, pipelines, control circuits and related auxiliary devices, and the hydraulic cylinders corresponding to the hydraulic valves are selected to realize required actions by driving the hydraulic pumps through the motors on the premise that the single hydraulic lifting mechanism is ensured to be installed without errors and in a controlled state. Firstly, the proper nitrogen and the proper volume of hydraulic oil in the accumulator group are ensured, in addition, the work of exhausting and the like in the system is done, and the control of the hydraulic system of the heating furnace is started on the basis. Assume that the current sequence of process actions is: lifting charging furnace door, lifting steel charging machine, lowering charging furnace door, mechanically lifting furnace bottom, mechanically advancing furnace bottom, mechanically lowering furnace bottom, mechanically withdrawing furnace bottom, lifting discharging furnace door, discharging steelMachine rising shank-tapping machine lowering
-discharge door drop
Such a process action, of course, may be sequentially adjusted according to actual conditions. The lifting of the charging furnace door is realized by selecting a direction and controlling a speed through a corresponding volume debugging power unit and a hydraulic valve, the power unit adjusts the rotating speed and the displacement of the hydraulic pump according to the speed requirement, hydraulic oil of an energy accumulator set enters a rod cavity of a hydraulic cylinder of the charging furnace door after passing through a volume speed regulation power unit, the hydraulic cylinder retracts to realize the lifting of the furnace door, and at the moment, the rod-free cavity of the hydraulic cylinder of the charging furnace door only needs to ensure small positive pressure; when the steel loading machine needs to ascend, the corresponding volume speed regulation power unit and the valve platform can act, so that hydraulic oil in the energy accumulator group enters a rodless cavity of a hydraulic cylinder of the steel loading machine through the volume speed regulation power unit to realize the lifting work of the steel loading machine, the rod cavity of the hydraulic cylinder of the steel loading machine is a communicated energy accumulator group, and the hydraulic oil enters the energy accumulator group as supplement when ascending; similarly, when the steel loading machine descends, the rod cavity of the hydraulic cylinder of the steel loading machine generates a back pressure under the dual actions of the hydraulic oil of the accumulator group and a heavy object, and the back pressure is recovered into the accumulator group under the control of the volume speed regulation power unit; and (4) a descending process of the charging furnace door is mainly characterized in that hydraulic oil is sucked from a rod cavity of a hydraulic cylinder of the charging furnace door by a volume speed regulation power unit and is recycled to an energy accumulator group, so that the hydraulic oil of the furnace door realizes energy recycling through the volume speed regulation power unit under the action of gravity, the recycled energy is used for the next action, only one positive pressure needs to be ensured in the rod cavity of the hydraulic cylinder of the charging furnace door in the process, and the control of the charging furnace door and a steel loading machine is realized by the actions. The steel loading machine and the charging furnace door are generally controlled by two hydraulic cylinders respectively, and because a driving motor of a volume speed regulating unit is connected with two or more hydraulic pumps in series, under the same motor rotating speed, the steel loading machine and the charging furnace door are driven by the motor and the hydraulic pump setThe position synchronization of the two hydraulic pumps is kept through the volume speed regulation control, and the displacement of the corresponding hydraulic pump can be changed to realize the motion control of one hydraulic pump when a single furnace door needs to be lifted under special conditions. When the furnace bottom is lifted mechanically, the hydraulic oil flow required by the furnace bottom mechanical lifting hydraulic cylinder is large, and the loading steel machine and the furnace door do not have action requirements at this time, so that pump groups of 1 or more volume speed regulating units are required to be controlled in parallel, at this time, the hydraulic pump sucks hydraulic oil from the energy accumulator group and then conveys the hydraulic oil to a rodless cavity of the furnace bottom mechanical lifting hydraulic cylinder, the hydraulic oil in the rod cavity of the furnace bottom mechanical lifting hydraulic cylinder is discharged into a pipeline of the energy accumulator to be supplemented to the pump group unit, the lifting accumulative differential control of the furnace bottom machinery is realized, and different movement speeds can be realized by the volume speed regulating control of the pump group unit, such as the control requirement of low-speed blank receiving. When the furnace bottom mechanical translation hydraulic cylinder moves forwards, the flow demand of the furnace bottom mechanical translation hydraulic cylinder on hydraulic oil is not large, the hydraulic cylinder is controlled by one hydraulic pump in the pump unit, and other hydraulic pumps are in zero-displacement output, so that the output of energy can be reduced, the convenience of hydraulic control is ensured, and the motion control of the furnace bottom mechanical translation hydraulic cylinder is realized under the control of the volume speed regulation of the hydraulic pump. When the furnace bottom mechanical lifting hydraulic cylinder descends, under the combined action of the rod cavity of the furnace bottom mechanical lifting hydraulic cylinder and the load, hydraulic oil in the rodless cavity of the furnace bottom mechanical lifting hydraulic cylinder enters the energy accumulator group and the rod cavity of the furnace bottom mechanical lifting hydraulic cylinder under the control of the volume speed regulating pump group, so that the related requirements of energy recovery and motion control are met, and the volume configuration requirement of the energy accumulator group is reduced. The action and control principle of the furnace bottom machine when the furnace bottom machine retreats is the same as that when the furnace bottom machine moves forwards. Discharging furnace door rising and discharging machine falling
-discharge door drop
The four actions are the same as the control requirements and principles of the steel loading machine and the loading furnace door.
The invention has the beneficial effects that: according to the hydraulic control system of the walking beam furnace, all hydraulic cylinders adopt an energy-saving principle of combining pump-controlled volume speed regulation control and energy recovery of an energy accumulator, the problems of low overall efficiency, serious energy waste and the like of the hydraulic system of the walking beam furnace are solved, and in addition, on the basis of overall energy saving of the hydraulic system, synchronous control requirements of a plurality of hydraulic cylinders are also met by adopting a special volume speed regulation pump unit. The invention has the characteristics of good energy-saving effect, low investment and operation cost, simple control and structure and the like, is an overall optimal energy-saving technology of the hydraulic system of the walking beam furnace, and is very suitable for controlling equipment such as a walking beam furnace lifting mechanism, a walking beam cooling bed and the like.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1.1-a first motor, 1.2-a second motor, 2.1-a first hydraulic pump, 3.1-a second hydraulic pump, 2.2-a third hydraulic pump, 3.2-a fourth hydraulic pump, 4.1-a first plug-in hydraulic lock, 4.2-a second plug-in hydraulic lock, 4.3-a third plug-in hydraulic lock, 4.4-a fourth plug-in hydraulic lock, 4.5-a fifth plug-in hydraulic lock, 4.6-a sixth plug-in hydraulic lock, 4.7-a seventh plug-in hydraulic lock, 4.8-an eighth plug-in hydraulic lock, 4.9-a ninth plug-in hydraulic lock, 4.10-a tenth plug-in hydraulic lock, 4.11-an eleventh plug-in hydraulic lock, 4.12-a twelfth plug-in hydraulic lock, 4.13-a thirteenth plug-in hydraulic lock, 4.14-a fourteenth plug-in hydraulic lock, 5.1-a first pressure sensor, 5.2-a second pressure sensor, 4.3.2-a third pressure sensor, 5.6-a fifth pressure sensor, 5.6-a pressure sensor, 7-a first one-way valve, 8-a reversing valve, 9-a safety valve, 10-a second oil supplementing pump group, 11-a second one-way valve, 12-a high back pressure one-way valve, 13-an accumulator group, 14.1-a first furnace bottom mechanical lifting hydraulic cylinder, 14.2-a second furnace bottom mechanical lifting hydraulic cylinder, 15-a furnace bottom mechanical translation hydraulic cylinder, 16.1-a first charging furnace door lifting hydraulic cylinder, 16.2-a second charging furnace door lifting hydraulic cylinder, 17.1-a first steel charging machine lifting hydraulic cylinder, 17.2-a second steel charging machine lifting hydraulic cylinder, 18.1-a first discharging furnace door lifting hydraulic cylinder, 18.2-a second discharging furnace door lifting hydraulic cylinder, 19.1-a first steel tapping machine lifting hydraulic cylinder, 19.2-a second steel tapping machine lifting hydraulic cylinder, 20-a hydraulic oil tank and 21-an oil supplementing one-way valve.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention, and as shown in the drawing, the hydraulic control system of the walking beam furnace in this embodiment includes a hydraulic oil tank, at least one set of execution components, an energy storage set, and an oil replenishment pump set, where the execution components include a pump set unit, a valve control unit, and a hydraulic cylinder set, the hydraulic oil tank is sequentially communicated with the pump set unit, the valve control unit, the hydraulic cylinder set, and the energy storage set to form a main flow path of the hydraulic oil tank, and the oil replenishment pump set is communicated between the hydraulic oil tank and the valve control unit to serve as a backup of the pump set unit.
In this embodiment, when the execution assemblies are multiple sets, the multiple sets of execution assemblies are in parallel, so that the execution assemblies of each set do not interfere with each other.
In the embodiment, the pump unit comprises a motor and at least two hydraulic pumps connected in series and is used for carrying out pump control debugging control on a hydraulic control system of the stepping heating furnace, the valve control unit comprises a plurality of hydraulic valves respectively communicated with the pump unit, the hydraulic valves are mutually connected in parallel, the hydraulic cylinder group comprises a plurality of hydraulic cylinders connected in parallel, and the plurality of hydraulic cylinders are correspondingly connected in series with the plurality of hydraulic valves one by one; at least one cavity of the hydraulic cylinder is communicated with the accumulator group indirectly or directly.
In this embodiment, the hydraulic valve is a plug-in hydraulic lock.
In this embodiment, the hydraulic cylinder is a furnace bottom mechanical lifting hydraulic cylinder, a furnace bottom mechanical translation hydraulic cylinder, a charging furnace door lifting hydraulic cylinder, a steel charging machine lifting hydraulic cylinder, a discharging furnace door lifting hydraulic cylinder or a tapping machine lifting hydraulic cylinder.
In this embodiment, the hydraulic pump in the pump unit has two pressure ports, one of which is in communication with the hydraulic cylinder group and the other of which is in communication with the accumulator group.
In this embodiment, the main control mode of the pump control debugging control is realized by controlling the rotation speed of the motor, controlling the displacement of the hydraulic pump, and controlling the motor rotation direction and the displacement reversing of the hydraulic pump.
When the system works normally, the accumulator group is required to be filled with required hydraulic oil, the hydraulic oil tank 20 is required to be filled with proper amount of hydraulic oil, and the pump unit, the power control system, the hydraulic cylinder, the hydraulic valve and other equipment can be controlled to act on the premise of no error in installation and controlled state. The initial starting action is to start an oil supplementing pump unit 6 firstly, a driving oil supplementing power unit starts to provide hydraulic oil for a system pipeline through a first one-way valve 7 and a reversing valve 8 until a set target maximum pressure is reached in an energy accumulator set 13 and a pipeline, actual pressure is read by a pressure sensor 5.5, a safety valve 9 can ensure that an end of the energy accumulator set and a port B of the pump unit are both below safe pressure, and in addition, an oil supplementing pressure is provided at a port A of the pump unit at any time and is provided by external oil supply through a one-way valve 21, so that the port A is ensured not to be empty; when the set pressure in the accumulator group and a pipeline communicated with the accumulator group is reached, the first motor 1.1 and the second motor 1.2 are started, and the hydraulic oil in the accumulator group is driven to enter the port A from the port B or enter the port B from the port A under the coordination of the motor rotation direction with the first hydraulic pump 2.1, the second hydraulic pump 2.2, the third hydraulic pump 3.1 and the fourth hydraulic pump 3.2 respectively. And then, according to the process requirement, each hydraulic cylinder completes corresponding action, wherein standard stepping is taken as an example for detailed description, and the standard action flow comprises the following steps: lifting charging furnace door, lifting charging machine, lowering charging furnace door, mechanically lifting furnace bottom, mechanically advancing furnace bottom, mechanically lowering furnace bottom, mechanically withdrawing furnace bottom, lifting discharging furnace door, lifting discharge machine and lowering discharge machine
Lowering of the outfeed oven door
Firstly, explaining by the action of a first check valve, under the coordination of the steering of a first motor 1.1 and a first hydraulic pump 2.1, hydraulic oil in a driving energy accumulator set enters an opening A from an opening B, the hydraulic oil enters a rod cavity of a first charging furnace door lifting hydraulic cylinder 16.1 under the control of a third plug-in hydraulic lock 4.3, so that the hydraulic cylinder retracts to realize the lifting of a furnace door, the movement speed and the movement position of the hydraulic cylinder are controlled by the displacement combination of the motor and the hydraulic pump, at the moment, the hydraulic oil in the rod-free cavity of the hydraulic cylinder enters a pipeline, and as the pressure increase exceeds the design pressure of a high back pressure check valve 12, the first check valve 7 is opened, and the hydraulic oil is discharged into an oil tank. After the first charging furnace door lifting hydraulic cylinder 16.1 retracts to the right position, the position of the first charging furnace door lifting hydraulic cylinder 16.1 is kept through the cutting-off of the third plug-in type hydraulic lock 4.3, and meanwhile the discharge capacity of the first hydraulic pump 2.1 and the rotating speed of the first motor 1.1 are controlled, so that the hydraulic pump outputs no flow. At this time, the third hydraulic pump 3.1 is at zero displacement, and no hydraulic oil is discharged from the pump port, so that the control of one hydraulic cylinder is ensured. If synchronous action of the first charging furnace door lifting hydraulic cylinder 16.1 and the second charging furnace door lifting hydraulic cylinder 16.2 is required, the actions can also be simultaneously performed on the second charging furnace door lifting hydraulic cylinder 16.2, when the first charging furnace door lifting hydraulic cylinder 16.1 acts, hydraulic oil enters a rod cavity of the second charging furnace door lifting hydraulic cylinder 16.2 from B to A through a seventh plug-in hydraulic lock 4.7 under the drive of a third hydraulic pump 3.1, so that the hydraulic cylinder retracts to realize the lifting action of the 2# charging furnace door, a loop is cut off by the seventh plug-in hydraulic lock 4.7 after the hydraulic cylinder is in place, and the zero-displacement output of the third hydraulic pump 3.1 is ensured to realize the stop keeping; and the synchronous control of the No. 1 and No. 2 charging furnace doors realizes volume synchronous control by adjusting the displacement of the hydraulic pump.
And the lifting of the first steel loading machine lifting hydraulic cylinder 17.1 and the second steel loading machine lifting hydraulic cylinder 17.2 can be carried out, the two hydraulic cylinders can independently act and can also be synchronously controlled, when the two hydraulic cylinders independently act, the volume debugging control is carried out through the corresponding pump and control valve combination, and in addition, the hydraulic pump corresponding to the hydraulic cylinder which does not act is at zero displacement, so that the independent action is realized. The lifting hydraulic cylinder 17.1 of the first steel loading machine is controlled by the first hydraulic pump 2.1 and the fourth plug-in hydraulic lock 4.4, the pressure from the port B to the port A to a rodless cavity of the hydraulic cylinder, and the lifting action of the hydraulic cylinder is realized; and the second steel loading machine lifting hydraulic cylinder 17.2 is controlled by the third hydraulic pump 3.1 and the eighth plug-in hydraulic lock 4.8, and the pressure is transferred from the port B to the port A to a rodless cavity of the hydraulic cylinder, so that the lifting action of the hydraulic cylinder is realized. The rod cavities of the first steel loading machine lifting hydraulic cylinder 17.1 and the second steel loading machine lifting hydraulic cylinder 17.2 are communicated with the energy accumulator group 13 and are also communicated with the ports B of the first hydraulic pump 2.1 and the third hydraulic pump 3.1, and hydraulic oil discharged from the rod cavities enters the rodless cavity of the hydraulic cylinder from the port B of the hydraulic pump finally in the lifting process, so that the volume requirement of the energy accumulator is reduced. After the hydraulic cylinder is in place, the corresponding hydraulic lock cuts off the circuit, and the position of the hydraulic cylinder is maintained.
Action (c) the descending of first dress steel machine hydraulic cylinder 17.1, second dress steel machine hydraulic cylinder 17.2, likewise, these two pneumatic cylinders can the isolated action, also can synchronous control, when isolated action, carry out volume debugging control through corresponding pump and control valve combination, the hydraulic pump that the pneumatic cylinder that does not act corresponds in addition is in zero discharge capacity to realize the isolated action. The first steel loading machine lifting hydraulic cylinder 17.1 is controlled by a first hydraulic pump 2.1 and a fourth plug-in hydraulic lock 4.4, hydraulic oil flows into a pump set port A from a rodless cavity of the hydraulic cylinder, then flows to a port B from the port A under the action of the pump, the steel loading machine descends by retracting the hydraulic cylinder, after the hydraulic oil enters the port B, one part of the hydraulic oil enters a rod cavity of the hydraulic cylinder, and the other part of the hydraulic oil reversely flows into an energy accumulator set 13; the same principle is adopted when the lifting hydraulic cylinder 17.2 of the second steel loading machine is controlled, and the synchronous control of the two steel loading machines can be ensured through volume debugging.
The first charging furnace door hydraulic cylinder 14.1 and the second charging furnace door hydraulic cylinder 14.2 are descended, the action and the action are opposite, the basic principle is the same, the flow direction of the hydraulic oil is changed only under the coordination of the first motor 1.1 turning to the first hydraulic pump 2.1 and the displacement of the second hydraulic pump 2.2, the hydraulic oil is discharged to the port B from the port A, the hydraulic cylinder extends out to realize the action of descending the furnace door, all the hydraulic oil in the rod cavity of the hydraulic cylinder completely enters the energy accumulator group 13, and the rod-free cavity of the hydraulic cylinder only needs to supplement lower hydraulic oil from a low-pressure oil supplementing system consisting of the second oil supplementing pump group 10, the second check valve 11 and the high back pressure check valve 12 to avoid air suction.
The lifting of a first furnace bottom mechanical lifting hydraulic cylinder 14.1 and a second furnace bottom mechanical lifting hydraulic cylinder 14.2 is carried out: under the coordination of motor steering and the first hydraulic pump 2.1, the second hydraulic pump 2.2, the third hydraulic pump 3.1 and the fourth hydraulic pump 3.2, hydraulic oil in an energy accumulator group is driven to enter the port A from the port B, so that the pressure of the port A is increased, the hydraulic oil enters the first furnace bottom mechanical lifting hydraulic cylinder 14.1 and the second furnace bottom mechanical lifting hydraulic cylinder 14.2 under the control of the first plug-in type hydraulic lock 4.1, the fifth plug-in type hydraulic lock 4.5, the ninth plug-in type hydraulic lock 4.9 and the twelfth plug-in type hydraulic lock 4.12, when the hydraulic cylinders need to be decelerated in the material receiving process, the rotating speeds of the first motor 1.1 and the second motor 1.2 can be reduced or the displacements of the first hydraulic pump 2.1, the second hydraulic pump 2.2, the third hydraulic pump 3.1 and the fourth hydraulic pump 3.2 are reduced to realize speed control, and the whole furnace bottom machine can realize the desired lifting position and speed control. After the lifting hydraulic cylinder is lifted in place, a hydraulic loop is cut off through the first plug-in type hydraulic lock 4.1, the fifth plug-in type hydraulic lock 4.5, the ninth plug-in type hydraulic lock 4.9 and the twelfth plug-in type hydraulic lock 4.12, and the lifting hydraulic cylinder is locked at a high position to wait.
Action sixthly, the mechanical translation hydraulic cylinder 15 at the bottom of the furnace advances: under the drive of the first motor 1.1 and the first hydraulic pump 2.1, hydraulic oil in the driving energy accumulator group enters the port A from the port B, so that the pressure of the port A is increased, the hydraulic oil enters the translation hydraulic cylinder through the second plug-in hydraulic lock 4.2, so that the mechanical hydraulic cylinder at the furnace bottom finishes forward movement, and the hydraulic cylinders are symmetrical, so that the hydraulic oil in the other cavity enters the port B of the pump group from a pipeline.
Action (c) the first furnace bottom mechanical lifting hydraulic cylinder 14.1 and the second furnace bottom mechanical lifting hydraulic cylinder 14.2 descend: the action is the reverse of the action fifth, under the action of rod cavity back pressure and heavy load, hydraulic oil in a rodless cavity flows to ports A of a first hydraulic pump 2.1, a second hydraulic pump 2.2, a third hydraulic pump 3.1 and a fourth hydraulic pump 3.2 through a first plug-in hydraulic lock 4.1, a fifth plug-in hydraulic lock 4.9 and a twelfth plug-in hydraulic lock 4.12 under the action of a pump set, a first motor 1.1 and a second motor 2.1, then part of the hydraulic oil enters a rod cavity of the hydraulic cylinder, the other part of the hydraulic oil enters an energy accumulator set 13, and after speed and position control is completed, the hydraulic cylinder cuts off oil circuit locking through the first plug-in hydraulic lock 4.1, the fifth plug-in hydraulic lock 4.5, the ninth hydraulic lock 4.9 and the twelfth plug-in hydraulic lock 4.12.
Action (b) furnace bottom mechanical translation hydraulic cylinder 15 retreats: under the drive of the high back pressure of the energy accumulator group 13, hydraulic oil in the other cavity of the furnace bottom mechanical translation hydraulic cylinder 15 enters the port A of the first hydraulic pump 2.1 through the second plug-in hydraulic lock 4.2, and the hydraulic oil enters the port B from the port A under the drive of the first motor 1.1 and the first hydraulic pump 2.1, so that the pressure of the port B is increased, and the furnace bottom mechanical hydraulic cylinder finishes the retreating action.
Action ninthly, lifting action of the first discharging furnace door hydraulic cylinder 18.1 and the second discharging furnace door hydraulic cylinder 18.2: under the coordination of the steering of the second motor 1.2 and the second hydraulic pump 2.2, hydraulic oil in the driving energy accumulator group enters the port A from the port B, the hydraulic oil enters the rod cavity of the first discharging furnace door hydraulic cylinder 18.1 under the control of the tenth plug-in hydraulic lock 4.10, so that the hydraulic cylinder retracts to realize the lifting of the furnace door, the speed and the position of the movement of the hydraulic cylinder are controlled by the displacement combination of the motor and the hydraulic pump, at the moment, the hydraulic oil in the rod-free cavity of the hydraulic cylinder enters a pipeline, and the hydraulic oil is discharged into an oil tank because the pressure increase exceeds the design pressure of the high-back-pressure check valve 12, the check valve is opened. After the oil cylinder retracts to the right position, the position of the hydraulic cylinder is kept through the cutting-off of the tenth plug-in type hydraulic lock 4.10, and meanwhile the discharge capacity of the second hydraulic pump 2.2 and the rotating speed of the second motor 1.2 are controlled, so that the hydraulic pump outputs no flow. At this time, the fourth hydraulic pump 3.2 is at zero displacement, and no hydraulic oil is discharged from the pump port, so that the control of one hydraulic cylinder is ensured. If synchronous action of the first discharging furnace door hydraulic cylinder 18.1 and the second discharging furnace door hydraulic cylinder 18.2 is needed, the actions can also be simultaneously performed on the second discharging furnace door hydraulic cylinder 18.2, hydraulic oil is driven by the second hydraulic pump 2.2 while the first discharging furnace door hydraulic cylinder 18.1 acts, the zero-displacement output of the fourth hydraulic pump 3.2 is ensured, the hydraulic oil enters a rod cavity of the second discharging furnace door hydraulic cylinder 18.2 through a thirteenth plug-in hydraulic lock 4.13, the hydraulic cylinder retracts to realize the lifting action of the 2# discharging furnace door, and a loop is cut off by the thirteenth plug-in hydraulic lock 4.13 after the hydraulic cylinder is in place; and the synchronous control of the No. 1 and No. 2 discharging furnace doors realizes volume synchronous control by adjusting the discharge capacity of the hydraulic pump.
Lifting action of first tapping machine hydraulic cylinder 19.1 and second tapping machine hydraulic cylinder 19.2 at action r: similarly, the two hydraulic cylinders can independently act and can also be synchronously controlled, when the two hydraulic cylinders independently act, the volume debugging control is carried out through the corresponding pump and control valve combination, and in addition, the hydraulic pump corresponding to the hydraulic cylinder which does not act is in zero displacement, so that the independent action is realized. The first tapping machine hydraulic cylinder 19.1 is controlled by the second hydraulic pump 2.2 and the eleventh plug-in hydraulic lock 4.11, pressure from a port B to a port A to a rodless cavity of the hydraulic cylinder, and lifting action of the hydraulic cylinder is realized; the second tapping machine hydraulic cylinder 19.2 is controlled by the fourth hydraulic pump 3.2 and the fourteenth plug-in hydraulic lock 4.14, pressure is transferred from the port B to the port A to a rodless cavity of the hydraulic cylinder, and lifting action of the hydraulic cylinder is realized. The rod cavities of the first tapping machine hydraulic cylinder 19.1 and the second tapping machine hydraulic cylinder 19.2 are communicated with the energy accumulator group 13 and are also communicated with the B ports of the second hydraulic pump 2.2 and the fourth hydraulic pump 3.2, and hydraulic oil discharged from the rod cavities enters the rodless cavity of the hydraulic cylinder finally from the B port of the hydraulic pump in the ascending process, so that the volume requirement of the energy accumulator is reduced. After the hydraulic cylinder is in place, the corresponding hydraulic lock cuts off the circuit, and the position of the hydraulic cylinder is maintained.
Movement of
Lowering operation of the first and second tapping machine hydraulic cylinders 19.1, 19.2: similarly, the two hydraulic cylinders can independently act and can also be synchronously controlled, when the two hydraulic cylinders independently act, the volume debugging control is carried out through the corresponding pump and control valve combination, and in addition, the hydraulic pump corresponding to the hydraulic cylinder which does not act is in zero displacement, so that the independent action is realized. First tappingThe hydraulic cylinder 19.1 is controlled by the second hydraulic pump 2.2 and the eleventh plug-in hydraulic lock 4.11, hydraulic oil flows into the port A of the pump group from a rodless cavity of the hydraulic cylinder, then flows to the port B from the port A under the action of the pump, the hydraulic cylinder retracts to realize the descending of the tapping machine, after the hydraulic oil enters the port B, one part of the hydraulic oil enters a rod cavity of the hydraulic cylinder, and the other part of the hydraulic oil reversely flows into the energy accumulator group 13; the same principle is used for controlling the hydraulic cylinder 19.2 of the second tapping machine, and the synchronous control of the two tapping machines can be ensured by volume adjustment.
Movement of
Descending actions of the first discharging furnace door hydraulic cylinder 18.1 and the second discharging furnace door hydraulic cylinder 18.2 are as follows: the action and the action ninthly are reverse, the basic principle is the same, the flowing direction of hydraulic oil is changed only by matching the displacement of a second motor 1.2 turning to a second hydraulic pump 2.2 and a fourth hydraulic pump 3.2, the hydraulic oil is discharged from an A port to a B port, so that the hydraulic cylinder extends out to realize the action of descending the furnace door, all the hydraulic oil in a rod cavity of the hydraulic cylinder completely enters an energy accumulator group 13 through a pump group, and a rodless cavity of the hydraulic cylinder only needs to be supplemented with lower hydraulic oil from a low-pressure oil supplementing system consisting of the second oil supplementing pump group 10, the second check valve 11 and the high back pressure check valve 12 to avoid air suction.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The utility model provides a marching type heating furnace hydraulic control system which characterized in that: the hydraulic oil tank is communicated with the pump unit, the valve control unit, the hydraulic cylinder group and the energy accumulator group in sequence to form a main flow passage of the hydraulic oil tank, and the oil supplementing pump group is communicated between the hydraulic oil tank and the valve control unit.
2. The hydraulic control system for the walking beam furnace according to claim 1, wherein: when the execution components are in multiple groups, the multiple groups of execution components are in parallel relation.
3. The hydraulic control system for the walking beam furnace according to claim 1, wherein: the pump unit comprises a motor and at least two hydraulic pumps connected in series and is used for carrying out pump control debugging control on a hydraulic control system of the stepping heating furnace, the valve control unit comprises a plurality of hydraulic valves respectively communicated with the pump unit, the hydraulic valves form a parallel relation, the hydraulic cylinder group comprises a plurality of hydraulic cylinders connected in parallel, and the plurality of hydraulic cylinders are correspondingly connected in series with the plurality of hydraulic valves one by one; at least one cavity of the hydraulic cylinder is communicated with the accumulator group indirectly or directly.
4. The hydraulic control system for the walking beam furnace according to claim 3, wherein: the hydraulic valve is a plug-in hydraulic lock.
5. The hydraulic control system for the walking beam furnace according to claim 4, wherein: the hydraulic cylinder is a furnace bottom mechanical lifting hydraulic cylinder, a furnace bottom mechanical translation hydraulic cylinder, a charging furnace door lifting hydraulic cylinder, a steel charging machine lifting hydraulic cylinder, a discharging furnace door lifting hydraulic cylinder or a tapping machine lifting hydraulic cylinder.
6. The hydraulic control system for the walking beam furnace according to claim 5, wherein: the hydraulic pump in the pump unit is provided with two pressure ports, one pressure port is communicated with the hydraulic cylinder group, and the other pressure port is communicated with the energy storage group.
7. The hydraulic control system for the walking beam furnace according to claim 3, wherein: the main control mode of the pump control debugging control is realized by controlling the rotating speed of a motor, controlling the displacement of a hydraulic pump, and controlling the motor steering and the displacement reversing of the hydraulic pump.
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| CN202111677403.6A CN114294275A (en) | 2021-12-31 | 2021-12-31 | Hydraulic control system of walking beam furnace |
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| CN202111677403.6A CN114294275A (en) | 2021-12-31 | 2021-12-31 | Hydraulic control system of walking beam furnace |
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