CN113983039B - Cluster control system for hydraulic lifting mechanism - Google Patents
Cluster control system for hydraulic lifting mechanism Download PDFInfo
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- CN113983039B CN113983039B CN202111370702.5A CN202111370702A CN113983039B CN 113983039 B CN113983039 B CN 113983039B CN 202111370702 A CN202111370702 A CN 202111370702A CN 113983039 B CN113983039 B CN 113983039B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims description 40
- 230000005611 electricity Effects 0.000 claims description 16
- 239000003921 oil Substances 0.000 claims description 16
- 239000010720 hydraulic oil Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 230000033764 rhythmic process Effects 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005381 potential energy Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
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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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/18—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors used in combination for obtaining stepwise operation of a single controlled member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic lifting mechanism cluster control system which can carry out load matching on a plurality of hydraulic lifting systems on a production line, can recycle and reuse hydraulic energy of the hydraulic lifting systems, has the characteristics of good energy saving effect, low investment and running cost, simple control and structure and the like, is an optimal energy saving technology for a hydraulic lifting system cluster, and is very suitable for controlling cluster equipment comprising a stepping heating furnace lifting mechanism, a stepping steel coil conveyer lifting mechanism and the like.
Description
Technical Field
The invention relates to a hydraulic lifting mechanism cluster control system.
Background
The hydraulic driving lifting mechanism has wider application in the field of ferrous metallurgy, such as steel coil conveying lifting trolleys, step heating furnaces, step steel coil conveyers and the like, and the hydraulic driving lifting mechanism is mainly used for lifting and conveying heavy objects such as steel billets, steel coils and the like. In general, such a hydraulic lifting system is not independent, and there are multiple hydraulic lifting mechanisms on a production line, and the lifting hydraulic cylinders of the stepping lifting mechanisms are used for repeatedly lifting and lowering weights of hundreds of tons or even thousands of tons in the working process, so that the lifted object has great gravitational potential energy in the descending process. At present, only a very small amount of technology is used for recycling gravitational potential energy of the equipment, and the technology is based on the recycling of hydraulic energy by adopting a hydraulic accumulator, and has the following defects:
1. it is difficult to match the variable load to the reference pressure of the hydraulic accumulator
Typically, the hydraulic accumulator has a charge pressure or nitrogen cylinder pressure as a minimum working reference pressure at which to match the working pressure. In actual work, the load is not constant and the variation range is very large, so that the pressure of a group of constant hydraulic accumulators can not actually meet the normal working requirement of lifting equipment, and the load is difficult to match due to the fact that the pressure accumulators are matched through a plurality of groups of pressure accumulators, meanwhile, the control difficulty is increased, and the equipment failure rate is improved.
2. Energy recovery and reutilization among devices during cluster control are difficult to achieve
The gravitational potential energy of the single lifting mechanism can be partially recovered through the hydraulic energy accumulator, but in consideration of the characteristics that the distance between the single lifting mechanisms is far and the hydraulic energy cannot be transmitted remotely, the recovered hydraulic energy is difficult to transmit among a plurality of single mechanisms in the cluster.
Therefore, the problem that the plurality of hydraulic lifting mechanisms on one production line are difficult to match with changeable loads and the hydraulic energy is difficult to recycle is solved, and the hydraulic lifting mechanism cluster control system which can match loads of the plurality of hydraulic lifting systems on one production line and recycle the hydraulic energy of the plurality of hydraulic lifting mechanisms is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a hydraulic lifting mechanism cluster control system, which is used for solving the problems that the existing hydraulic lifting system is difficult to match with variable loads and the hydraulic energy is difficult to recycle.
In order to solve the technical problems, the invention provides a hydraulic lifting mechanism cluster control system, which comprises at least two groups of hydraulic lifting systems, at least two groups of first hydraulic control systems matched with the hydraulic lifting systems and a cluster motion controller respectively connected with the hydraulic lifting systems and the first hydraulic control systems; at least two first hydraulic control systems are connected in parallel on a direct current bus; the first hydraulic control system is used for converting hydraulic energy generated by descending of the hydraulic lifting system matched with the first hydraulic control system into electric energy and then transmitting the electric energy to the direct current bus or driving the corresponding hydraulic lifting system to work after taking electricity from the direct current bus; the cluster motion controller is used for controlling lifting action of the hydraulic lifting system and electric energy distribution on the direct current bus.
Further, the hydraulic lifting mechanism cluster control system also comprises at least one group of hydraulic recovery system, a second hydraulic control system matched with the hydraulic recovery system and an energy recovery energy accumulator group; the second hydraulic control system is used for converting hydraulic energy generated by descending of the hydraulic recovery system into electric energy and then transmitting the electric energy to the direct current bus or recovering the electric energy on the direct current bus to the energy accumulator group.
Further, the hydraulic lifting mechanism cluster control system also comprises a braking resistor which is respectively connected with the direct current bus and the cluster motion controller; when the recovery power of the accumulator group is larger than the recovery capacity, the electric energy exceeding the recovery capacity of the accumulator group is consumed through the brake resistor.
Further, the hydraulic lifting system comprises a first hydraulic cylinder and a lifting mechanism arranged on a piston rod of the first hydraulic cylinder, and a first hydraulic control valve of the first hydraulic cylinder is respectively connected with the first hydraulic control system and the cluster motion controller.
Further, the first hydraulic control system comprises a first hydraulic pump for adjusting the hydraulic oil inlet and outlet flow rate of the hydraulic lifting system and a first motor for driving the first hydraulic pump; the first hydraulic pump control valve of the first hydraulic pump is connected with the cluster motion controller; the first driver is connected with the cluster motion controller through the motor controller; the first driver drives the first motor to work after taking electricity from the direct current bus and the power grid, and the first motor converts hydraulic energy generated when the hydraulic lifting system descends into electric energy and transmits the electric energy to the direct current bus through the first driver.
Further, the hydraulic recovery system comprises a second hydraulic cylinder and an actuating mechanism arranged on a piston rod of the second hydraulic cylinder, and a second hydraulic control valve of the second hydraulic cylinder is respectively connected with the energy accumulator group, the second hydraulic control system and the cluster motion controller.
Further, the second hydraulic control system comprises a second hydraulic pump for adjusting the hydraulic oil inlet and outlet flow rate of the hydraulic oil of the hydraulic recovery system and a second motor for driving the second hydraulic pump; the second hydraulic pump control valve of the second hydraulic pump is connected with the cluster motion controller; the second driver is connected with the cluster motion controller through the motor controller; the second driver drives the second motor to work after taking electricity from the direct current bus and the power grid, and the second motor converts hydraulic energy generated when the hydraulic recovery system descends into electric energy and transmits the electric energy to the direct current bus through the second driver.
Further, the hydraulic lifting mechanism cluster control system also comprises a voltage detection device which is respectively connected with the direct current bus and the cluster motion controller.
The beneficial effects of the invention are as follows: the hydraulic lifting system load matching device can match loads of a plurality of hydraulic lifting systems on one production line, can recycle hydraulic energy of the hydraulic lifting systems, has the characteristics of good energy saving effect, low investment and running cost, simple control and structure and the like, is an optimal energy saving technology for a hydraulic lifting system cluster, and is very suitable for controlling cluster equipment comprising a stepping heating furnace lifting mechanism, a stepping steel coil conveyor lifting mechanism and the like.
Drawings
The accompanying drawings, in which like reference numerals refer to identical or similar parts throughout the several views and which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not to limit the application unduly. In the drawings:
FIG. 1 is a schematic diagram of an embodiment of the present invention;
Wherein: in the figure: 1. a cluster motion controller 21 and a first motor I; 22. a first motor II; 23. a second motor; 31. a first hydraulic pump I; 32. a first hydraulic pump II; 33. a second hydraulic pump; 41. a first hydraulic pump control valve I; 42. a first hydraulic pump control valve II; 43. a second hydraulic pump control valve; 51. a first hydraulic control valve I; 52. a first hydraulic control valve II; 53. a second hydraulic control valve; 61. a first hydraulic cylinder I; 62. a first hydraulic cylinder II; 71. a lifting mechanism I; 72. a lifting mechanism II; 8. a second hydraulic cylinder; 9. an actuator; 10. an accumulator set; 11. a pressure switch; 121. a first driver I; 122. a first driver II; 123. a second driver; 13. a motor controller; 14. a direct current bus; 15. a DC bus voltage detection device; 16. a brake resistor; 17. and (3) a power grid.
Detailed Description
The hydraulic lifting mechanism cluster control system shown in fig. 1 comprises at least two groups of hydraulic lifting systems (comprising a hydraulic lifting system I and a hydraulic lifting system II below), at least two groups of first hydraulic control systems matched with the hydraulic lifting systems, at least one group of hydraulic recovery systems, at least one group of energy recovery energy accumulator groups matched with the hydraulic recovery systems and a second hydraulic control system, and a cluster motion controller connected with the hydraulic lifting systems, the first hydraulic control systems, the hydraulic recovery systems, the energy accumulator groups and the second hydraulic control systems respectively; the first hydraulic control system and the second hydraulic control system are connected in parallel on the direct current bus; the cluster motion controller is used for controlling lifting actions of the hydraulic lifting system and the hydraulic recovery system and distributing electric energy on the direct current bus; the first hydraulic control system is used for transmitting electric energy generated by descending of the hydraulic lifting system to the direct current bus or driving the hydraulic lifting system to work after power is taken from the direct current bus; the second hydraulic control system is used for converting hydraulic energy generated by descending of the hydraulic recovery system into electric energy and then transmitting the electric energy to the direct current bus or recovering the electric energy on the direct current bus to the energy accumulator group.
When the hydraulic lifting system is put into operation, all parts of the single hydraulic lifting system, including pipelines, control circuits and related auxiliary devices, are connected in parallel through a direct current bus between drivers or frequency converters on the basis, and can control the hydraulic lifting clusters on the premise of ensuring that the single hydraulic lifting system is installed without errors and in a controlled state.
Firstly, assuming that one set of hydraulic lifting system lifting hydraulic cylinders in a hydraulic lifting cluster is at the lowest position, the hydraulic lifting system lifting hydraulic cylinders are required to lift under the control of a hydraulic pump, and at the moment, the corresponding motors of the hydraulic lifting system are in a state of taking electricity from a power grid, and the energy for lifting weights is all from the power grid; the hydraulic pump or other hydraulic cylinders controlling the lifting mechanism are in descending motion, the driving motor is in a power generation state under the action of gravity, and the motor in the two quadrants or the four quadrants transmits electric energy to the direct current bus. The hydraulic lifting system of the whole cluster is also in the same mode, and after being lifted independently for a plurality of times, the single hydraulic lifting system is ensured to be in a controllable state. The motor of the hydraulic recovery system connected in parallel on the direct current bus can take electricity from a power grid during working, and can absorb gravitational potential energy of the lifting mechanism to recover electric energy on the direct current bus. Then, cluster control is started, a cluster motion controller finishes control, firstly, a hydraulic lifting system I in a cluster is selected according to the process rhythm requirement to start rising, at the moment, a motor is powered from a power grid, the motor drives a hydraulic pump, a hydraulic control valve group controls a lifting hydraulic cylinder to rise, after the lifting hydraulic cylinder rises in place, the cluster motion controller controls a hydraulic lifting system II to rise, the hydraulic lifting system I is controlled to fall, the hydraulic lifting system I drives the hydraulic pump under the action of gravity to drive the motor to be in a power generation state, so that electric energy is transmitted to a direct current bus, electric energy is provided for the motor of the hydraulic lifting system II, and the insufficient part can be powered from the power grid; when the hydraulic lifting system I descends in place, the cluster motion controller controls the hydraulic lifting system II to descend after the hydraulic lifting system II ascends in place, the hydraulic lifting system II drives the hydraulic pump to drive the motor to be in a power generation state under the action of dead weight, electric energy is transmitted to the direct current bus, electric energy is provided for the ascending motor of the hydraulic lifting system I, and the insufficient part can be powered from the power grid. The two groups of hydraulic lifting systems circularly and alternately ascend and descend according to the mode, and the recovered electric energy is directly used without adding energy storage devices such as super capacitors.
When the hydraulic lifting system is not lifted to use the electric energy, the cluster motion controller controls the recovered electric energy to drive the motor of the hydraulic recovery system connected in parallel on the direct current bus to act, and drives the hydraulic pump to act to supplement oil for the energy accumulator set arranged in the hydraulic recovery system, so that the electric energy is converted into the hydraulic energy to be stored in the energy accumulator set.
In addition, the hydraulic lifting mechanism cluster control system also comprises a braking resistor which is respectively connected with the direct current bus and the cluster motion controller; when the recovery power of the accumulator group is larger than the recovery capacity, the electric energy exceeding the recovery capacity of the accumulator group is consumed through the brake resistor.
The hydraulic lifting system comprises a first hydraulic cylinder and a lifting mechanism arranged on a piston rod of the first hydraulic cylinder, and a first hydraulic control valve of the first hydraulic cylinder is respectively connected with the first hydraulic control system and the cluster motion controller. The first hydraulic control system comprises a first hydraulic pump and a first motor, wherein the first hydraulic pump is used for adjusting the inlet and outlet flow rate of hydraulic oil of the hydraulic lifting system, the first motor is used for driving the first hydraulic pump, the first motor can be used for adjusting the hydraulic oil of the hydraulic lifting system through the first hydraulic pump, and the speed regulation range can be adjusted in positive and negative directions; the first hydraulic pump control valve of the first hydraulic pump is connected with the cluster motion controller; the first driver is connected with the cluster motion controller through the motor controller; the first driver is powered from the direct current bus and the power grid and then drives the first motor to work, and the first motor converts hydraulic energy generated when the hydraulic lifting system descends into electric energy and then transmits the electric energy to the direct current bus through the first driver; wherein, the first motor can adopt a servo motor.
The hydraulic recovery system comprises a second hydraulic cylinder and an actuating mechanism arranged on a piston rod of the second hydraulic cylinder, and a second hydraulic control valve of the second hydraulic cylinder is respectively connected with the energy accumulator group, the second hydraulic control system and the cluster motion controller. The second hydraulic control system comprises a second hydraulic pump for adjusting the hydraulic oil inlet and outlet flow rate of the hydraulic oil of the hydraulic recovery system and a second motor for driving the second hydraulic pump; the second motor can adjust the hydraulic oil of the hydraulic recovery system through the second hydraulic pump, and the speed regulation range can be adjusted in positive and negative directions; the second hydraulic pump control valve of the second hydraulic pump is connected with the cluster motion controller; the second driver is connected with the cluster motion controller through the motor controller; the second driver is powered from the direct current bus and the power grid and then drives the second motor to work, and the second motor converts hydraulic energy generated when the hydraulic recovery system descends into electric energy and then transmits the electric energy to the direct current bus through the second driver; wherein, the second motor can adopt servo motor.
The following is a further description of the implementation of a hydraulic hoist cluster control system comprising two hydraulic hoist systems and a hydraulic recovery system:
Firstly, a first driver I121 of a hydraulic lifting system takes electricity from a power grid 17, a first motor I21 is driven by the first motor I21 and under the control of a first hydraulic pump control valve I41, a first hydraulic pump I31 starts to supply pressure oil to a rodless cavity of a first hydraulic cylinder I61 through the first hydraulic pump control valve I51, the first hydraulic cylinder I61 starts to ascend until the first hydraulic cylinder I61 sends a displacement stop signal, then the first hydraulic cylinder I61 starts to descend, the pressure oil of the hydraulic cylinder becomes active power oil under the gravity action of a lifting mechanism I71, the first hydraulic pump control valve I51 and the first hydraulic pump control valve I41 are switched under the control of a cluster motion controller 1, the pressure oil drives the first motor I21 to generate electricity through the first hydraulic pump I31, electric energy is fed back to a direct-current bus 14, and a bus voltage value is fed back to the cluster motion controller 1 by a direct-current bus voltage detection device 15; the lifting mechanism I71 is controlled to repeatedly lift and lower several times in the above manner until the respective hydraulic and electric components are operated normally. The operation of the lifting mechanism I71 is stopped, and the lifting mechanism II72 is controlled to repeatedly lift several times by the first motor II22, the first hydraulic pump II32, and the first hydraulic pump control valve II42 in the operation mode of the lifting mechanism I71 until the respective hydraulic and electric components are operated normally.
Then, stopping the actions of the lifting mechanism I71 and the lifting mechanism II72, after the second driver 123 takes electricity from the power grid 17 and starts, driving the second motor 23, starting to supply pressure oil to the rodless cavity of the second hydraulic cylinder 8 through the second hydraulic control valve 53 by the second hydraulic pump 33 under the drive of the motor and the control of the second hydraulic pump control valve 43, starting to extend the second hydraulic cylinder 8, and driving the executing mechanism 9 until the second hydraulic cylinder 8 sends out a displacement stop signal, at this time, under the control of the cluster motion controller 1, switching the second hydraulic control valve 53, and still taking electricity from the power grid 17 by the second driver 123, driving the second motor 23, starting to supply pressure oil to the rodless cavity of the second hydraulic cylinder 8 through the second hydraulic control valve 53 by the second hydraulic pump 33 under the drive of the second motor 23 and the control of the second hydraulic pump control valve 43, and starting to retract the second hydraulic cylinder 8 until the second hydraulic cylinder 8 sends out a displacement stop signal; the second hydraulic cylinder 8 is repeatedly controlled to operate several times until the respective hydraulic and electric components are operated normally. When the hydraulic recovery system is in operation, the second driver 123 takes electricity from the power grid 17, and the accumulator set 10 plays roles in stabilizing pressure and supplementing oil. So far, the three groups of hydraulic lifting systems all independently and normally act.
Then the cluster motion controller 1 enters cluster motion control. Firstly, a lifting mechanism I71 in a cluster is selected to start lifting, at the moment, a first driver I121 takes electricity from a power grid 17, a first motor I21 drives a first hydraulic pump I31, a first hydraulic cylinder I61 is controlled to lift through a first hydraulic control valve I51, the first hydraulic cylinder I61 rises to send a signal to a cluster motion controller 1 after being lifted in place, the cluster motion controller 1 controls a lifting mechanism II72 to rise, the lifting mechanism I71 is controlled to descend, pressure oil in the first hydraulic cylinder I61 becomes active pressure oil under the action of self gravity, under the control of a first hydraulic pump control valve I41, an oil port of the first hydraulic pump I31 is reversed, the pressure oil drives the first motor I21 to be in a power generation state, and gravitational potential energy is converted into electric energy to be transmitted to a direct current bus 14; while the lifting mechanism I71 descends, the first driver II122 absorbs electric energy transmitted to the direct current bus 14 by the lifting mechanism I71, the first motor II22 drives the first hydraulic pump II32, the first hydraulic cylinder II62 is controlled to ascend through the first hydraulic control valve II52, the first hydraulic cylinder II is in place to send a signal to the cluster motion controller 1, the cluster motion controller 1 further controls the lifting mechanism II72 to descend, the lifting mechanism I71 ascends, the lifting mechanism II72 descends to convert gravitational potential energy into electric energy to be transmitted to the direct current bus 14 in the same mode, and electric energy is directly provided for the lifting mechanism I71 to ascend. The lifting mechanism I71 and the lifting mechanism II72 are matched through the cluster motion controller 1 to lift and descend at the same speed, the rhythms are guaranteed to be basically consistent, when one lifting mechanism I71 and the lifting mechanism II72 ascend, the other lifting mechanism descends, the descending lifting mechanism converts gravitational potential energy into electric energy to be transmitted to the direct current bus 14, the ascending lifting mechanism is directly supplied with electric energy, energy is lost in conversion, and when the electric energy converted by the gravitational potential energy is insufficient to provide one lifting mechanism to ascend, the insufficient electric energy can be directly supplied by the power grid 17.
The operation of the second hydraulic cylinder 8 is controlled by the cluster motion controller 1, and the second driver 123 is connected in parallel to the direct current bus 14, but the operation is independent, and the linkage operation with the lifting mechanism I71 and the lifting mechanism II72 is not required. When the lifting mechanism I71 and the lifting mechanism II72 are lifted up and lowered down, the electric energy required by the operation of the second driver 123 is directly taken from the electric network 17. When the second hydraulic cylinder 8 is operated, the second motor 23 is in a motor state, and absorbs electric energy from the electric network 17 to drive the second hydraulic pump 33, and the second hydraulic cylinder 8 is controlled to operate by the second control valve 53, and in this state, the accumulator group 10 stabilizes the system pressure and supplements the system pressure oil. In special cases, for example, when one lifting mechanism stops production or overhauls, only one lifting mechanism acts, the electric energy transmitted to the direct current bus 14 by the lifting mechanism is used for driving the second motor 23 to drive the second hydraulic pump 33 to supply pressure oil to the second hydraulic cylinder 8, when the second hydraulic cylinder 8 does not act, the pressure oil is stored in the accumulator group 10, after the accumulator reaches the set pressure, the pressure switch 11 sends a signal to the cluster motion controller 1, and the cluster motion controller 1 controls the electric energy transmitted to the direct current bus 14 to be braked and consumed through the brake resistor 16 connected in parallel to the direct current bus 14.
In all the action processes, the motor controller 13 controls the first driver I121, the first driver II122 and the second driver 123 which are connected in parallel on the direct current bus 14, the servo motor controller 13 and the cluster motion controller 1 are communicated through buses, the cluster motion controller 1 is used as an upper computer to match actions among lifting mechanisms, all the hydraulic and electric equipment connected in parallel on the direct current bus 14 are controlled, and electric energy on the direct current bus 14 is uniformly managed and distributed.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and 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 and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (6)
1. The cluster control system of the hydraulic lifting mechanism is characterized by comprising at least two groups of hydraulic lifting systems, at least two groups of first hydraulic control systems matched with the hydraulic lifting systems and a cluster motion controller respectively connected with the hydraulic lifting systems and the first hydraulic control systems; at least two first hydraulic control systems are connected in parallel on a direct current bus; the first hydraulic control system is used for converting hydraulic energy generated by descending of the hydraulic lifting system matched with the first hydraulic control system into electric energy and then transmitting the electric energy to the direct current bus or driving the corresponding hydraulic lifting system to work after taking electricity from the direct current bus; the cluster motion controller is used for controlling lifting action of the hydraulic lifting system and electric energy distribution on the direct current bus;
The hydraulic lifting mechanism cluster control system also comprises at least one group of hydraulic recovery system, a second hydraulic control system matched with the hydraulic recovery system and an energy recovery energy accumulator group; the second hydraulic control system is used for converting hydraulic energy generated by descending of the hydraulic recovery system into electric energy and then transmitting the electric energy to the direct current bus or recovering the electric energy on the direct current bus to the energy accumulator group;
The hydraulic lifting mechanism cluster control system also comprises a braking resistor which is respectively connected with the direct current bus and the cluster motion controller; when the recovery power of the energy accumulator group is larger than the recovery capacity, the electric energy exceeding the recovery capacity of the energy accumulator group is consumed through the brake resistor;
The two groups of hydraulic lifting systems are respectively a hydraulic lifting system I and a hydraulic lifting system II; the cluster motion controller performs cluster control on the hydraulic lifting system I and the hydraulic lifting system II by adopting the following method:
Firstly, a hydraulic lifting system I in a cluster is selected according to the process rhythm requirement to start ascending, at the moment, a motor takes electricity from a power grid, the motor drives a hydraulic pump, a lifting hydraulic cylinder is controlled to ascend through a hydraulic control valve group, after the lifting hydraulic cylinder ascends in place, a cluster motion controller controls a hydraulic lifting system II to ascend, the hydraulic lifting system I is controlled to descend, the hydraulic lifting system I drives the hydraulic pump under the action of gravity to drive the motor to be in a power generation state, so that electric energy is transmitted to a direct current bus, electric energy is provided for the motor of the hydraulic lifting system II, and the insufficient part takes electricity from the power grid; when the hydraulic lifting system I descends to the right, the cluster motion controller controls the hydraulic lifting system II to descend and controls the hydraulic lifting system I to ascend, the hydraulic lifting system II drives the hydraulic pump to drive the motor to be in a power generation state under the action of dead weight, so that electric energy is transmitted to a direct current bus, electric energy is provided for the ascending motor of the hydraulic lifting system I, and the insufficient part is powered from a power grid;
when the furnace is shut down and the production is stopped, one group of hydraulic lifting systems descends to recover electric energy, and when no hydraulic lifting system ascends to use electric energy, the cluster motion controller controls the recovered electric energy to drive the motor of the hydraulic recovery system connected in parallel on the direct current bus to act, and drive the hydraulic pump to act to supplement oil for the energy accumulator set arranged in the hydraulic recovery system, so that the electric energy is converted into hydraulic energy to be stored in the energy accumulator set.
2. The hydraulic hoist system of claim 1, including a first hydraulic cylinder and a hoist mounted on a piston rod of the first hydraulic cylinder, a first hydraulic control valve of the first hydraulic cylinder being connected to the first hydraulic control system and the cluster motion controller, respectively.
3. The hydraulic hoist cluster control system of claim 1, characterized in that the first hydraulic control system includes a first hydraulic pump for adjusting a hydraulic oil inlet and outlet flow rate of the hydraulic hoist system and a first motor for driving the first hydraulic pump; the first hydraulic pump control valve of the first hydraulic pump is connected with the cluster motion controller; the first driver is connected with the cluster motion controller through the motor controller; the first driver drives the first motor to work after taking electricity from the direct current bus and the power grid, and the first motor converts hydraulic energy generated when the hydraulic lifting system descends into electric energy and transmits the electric energy to the direct current bus through the first driver.
4. The hydraulic lift mechanism cluster control system of claim 1 wherein the hydraulic reclamation system includes a second hydraulic cylinder and an actuator mounted on a piston rod of the second hydraulic cylinder, a second hydraulic control valve of the second hydraulic cylinder being connected to the accumulator bank, the second hydraulic control system, and the cluster motion controller, respectively.
5. The hydraulic hoist cluster control system of claim 1, characterized in that the second hydraulic control system includes a second hydraulic pump for adjusting a hydraulic oil inlet and outlet flow rate of the hydraulic recovery system and a second motor for driving the second hydraulic pump; the second hydraulic pump control valve of the second hydraulic pump is connected with the cluster motion controller; the second driver is connected with the cluster motion controller through the motor controller; the second driver drives the second motor to work after taking electricity from the direct current bus and the power grid, and the second motor converts hydraulic energy generated when the hydraulic recovery system descends into electric energy and transmits the electric energy to the direct current bus through the second driver.
6. The hydraulic hoist cluster control system of claim 1, further comprising voltage detection devices coupled to the dc bus and the cluster motion controller, respectively.
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| CN202111370702.5A CN113983039B (en) | 2021-11-18 | 2021-11-18 | Cluster control system for hydraulic lifting mechanism |
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| CN202111370702.5A CN113983039B (en) | 2021-11-18 | 2021-11-18 | Cluster control system for hydraulic lifting mechanism |
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| CN104196080A (en) * | 2014-09-17 | 2014-12-10 | 太原理工大学 | Variable-speed volume-control direct-drive all-electric hydraulic excavator drive and energy recovery system |
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| JP2016080098A (en) * | 2014-10-17 | 2016-05-16 | 川崎重工業株式会社 | Driving system of hydraulic working machine |
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| CN104196080A (en) * | 2014-09-17 | 2014-12-10 | 太原理工大学 | Variable-speed volume-control direct-drive all-electric hydraulic excavator drive and energy recovery system |
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