CN209875620U - Transmission system of stepping mechanism and energy recovery system thereof - Google Patents
Transmission system of stepping mechanism and energy recovery system thereof Download PDFInfo
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- CN209875620U CN209875620U CN201920776083.1U CN201920776083U CN209875620U CN 209875620 U CN209875620 U CN 209875620U CN 201920776083 U CN201920776083 U CN 201920776083U CN 209875620 U CN209875620 U CN 209875620U
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Abstract
The utility model discloses an energy recovery system, including hydraulic power unit, variable frequency drive unit and energy recuperation device. The hydraulic power unit comprises a speed regulating motor and a hydraulic pump, and the speed regulating motor is connected with the hydraulic pump. The variable frequency driving unit is connected with the speed regulating motor, and the energy recovery device is connected with the variable frequency driving unit. The variable frequency driving unit controls the speed regulating motor to drive the hydraulic pump to operate, volume speed regulation control is carried out on the hydraulic actuating element, and the hydraulic actuating element is driven to act, so that the load weight under different working conditions is automatically matched, throttling loss is avoided, the energy-saving effect is achieved, and the control and structure are simple. When the hydraulic actuating element descends or brakes, the hydraulic actuating element drives the speed regulating motor to be in a power generation state, so that potential energy and/or kinetic energy of the hydraulic actuating element are converted into electric energy, and the electric energy is transmitted to the energy recovery device through the variable-frequency driving unit for reuse. The utility model also discloses a transmission system of marching type mechanism, including above-mentioned energy recuperation system.
Description
Technical Field
The utility model relates to a metallurgical equipment technical field, concretely relates to transmission system of marching type mechanism and energy recuperation system thereof.
Background
The stepping mechanism is widely applied in the field of metallurgy, and a stepping heating furnace, a stepping transport beam, a stepping cooling bed and the like are common. Taking a stepping heating furnace as an example for explanation, the stepping mechanism is a transmission system consisting of a lifting hydraulic cylinder and a translation hydraulic cylinder, and is mainly used for lifting and translating steel billets in the heating furnace so that the steel billets are uniformly heated in the heating furnace. In the working process of a lifting hydraulic cylinder of the stepping furnace bottom machinery, the weight of hundreds of tons or even thousands of tons needs to be lifted and put down repeatedly, and the lifted object has great gravitational potential energy in the descending process; the translation hydraulic cylinder also drives hundreds of tons of steel billets to act with equipment, and large kinetic energy is generated in a braking ring section.
The energy is wasted in the existing transmission mode by heating in a throttling speed regulation mode, and not only is the energy wasted, but also other energy consumptions such as cooling are brought. In addition, the existing hydraulic transmission system of the stepping mechanism adopts a constant-pressure variable power source, the pressure of the existing hydraulic transmission system is prepared for the maximum weight no matter how much the weight is lifted, and the large no-load energy waste also exists.
In the existing engineering practice, a small amount of energy accumulators are used for recovering and reusing descending potential energy, the method is mainly realized by adopting a hydraulic cylinder with a special structure or additionally adding a balance cylinder, and the method has the problems that:
1. equipment with a stepping mechanism is required to be added, the structure is relatively complex, requirements are required for civil engineering and mechanical mechanisms, and the reconstruction of the existing equipment is not facilitated;
2. in order to match the load weight under different working conditions, the control and debugging are troublesome;
3. the control principle of valve control throttling speed regulation is adopted, so that a large amount of hydraulic throttling loss cannot be eliminated;
4. based on the power source of the constant-pressure variable pump, large no-load and low-load working conditions exist, and energy waste is inevitable;
5. the hydraulic accumulator group recovers energy for reuse, the required accumulator group occupies large space, and the use and maintenance of the accumulator are difficult.
So far, no technical scheme for recycling the translational kinetic energy of the stepping mechanism exists in the market.
In addition, patent CN108383039A discloses an energy-saving hydraulic control system for a step-by-step lifting mechanism, which can achieve a good energy-saving effect by recycling energy of an energy accumulator set and using a control scheme of a servo motor and a closed variable pump, but because the pressure of the energy accumulator is difficult to match due to the change of load, the stable control of movement is difficult in the process of high-pressure and low-pressure switching, and then the problems of difficult maintenance and limited service life of the energy accumulator are also the same problems in the use process, and the use of the energy accumulator set also has the requirement of installation space. In addition, the patent is a fully closed transmission system, and the temperature and the cleanliness of oil can be more difficult to control. And this patent has also only controlled the hydraulic cylinder of mechanism, does not solve the translation transmission problem in the same motion link.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a transmission system of a step mechanism and an energy recovery system thereof, which have good energy saving effect, simple control and simple structure.
An energy recovery system comprising:
the hydraulic power unit comprises a speed regulating motor and a hydraulic pump, and the speed regulating motor is connected with the hydraulic pump;
the variable frequency driving unit is connected with the speed regulating motor;
the energy recovery device is connected with the variable-frequency driving unit;
the variable frequency driving unit controls the speed regulating motor to drive the hydraulic pump to operate and drive the hydraulic actuating element to act; when the hydraulic actuating element descends or brakes, the hydraulic actuating element drives the speed regulating motor to be in a power generation state, so that potential energy and/or kinetic energy of the hydraulic actuating element are converted into electric energy, and the electric energy is transmitted to the energy recovery device through the variable-frequency driving unit for reuse.
In one embodiment, when the variable frequency driving unit is a four-quadrant frequency converter, the energy recovery device is the four-quadrant frequency converter itself, and energy is fed back to the power grid.
In one embodiment, when the variable frequency driving unit is a two-quadrant frequency converter, the energy recovery device is a super capacitor.
A step-by-step mechanism transmission system comprising:
a hydraulic oil tank;
the auxiliary power source is used for extracting hydraulic oil in the hydraulic oil tank;
an energy recovery system as claimed in any one of the preceding claims;
the two ends of the hydraulic actuating element oil path are respectively connected with the two oil ports of the hydraulic pump; and
a hydraulic control circuit for selecting and controlling the hydraulic actuators;
and the hydraulic oil extracted by the auxiliary power source is used as the oil supplement of the hydraulic power unit and as the control oil of the hydraulic control circuit.
In one embodiment, the hydraulic actuator comprises a translational hydraulic cylinder and a lifting hydraulic cylinder, and the translational hydraulic cylinder is connected in parallel with the lifting hydraulic cylinder.
In one embodiment, the auxiliary power source includes a first auxiliary power source and a second auxiliary power source, the first auxiliary power source draws hydraulic oil as control oil of the hydraulic control circuit, and the second auxiliary power source draws hydraulic oil as supplementary oil of the hydraulic power unit.
In one embodiment, the hydraulic control circuit includes a directional valve, a first trip isolation valve, a second trip isolation valve, a third trip isolation valve, and a fourth trip isolation valve;
the two oil ports of the hydraulic pump are respectively a first oil port and a second oil port, the first oil port of the hydraulic pump is connected with the rodless cavity oil port of the lifting hydraulic cylinder through the first cut-off isolation valve, and the rod cavity oil port of the lifting hydraulic cylinder is connected with the second oil port of the hydraulic pump through the second cut-off isolation valve;
a first oil port of the hydraulic pump is connected with one oil port of the translational hydraulic cylinder through the third cut-off isolation valve, and the other oil port of the translational hydraulic cylinder is connected with a second oil port of the hydraulic pump through the fourth cut-off isolation valve;
an oil inlet of the reversing valve is connected with an oil outlet of the first auxiliary power source, an oil return port of the reversing valve is connected with a hydraulic oil tank, one working oil port A of the reversing valve is connected with a control oil port of the first cut-off isolating valve and the second cut-off isolating valve, and the other working oil port B of the reversing valve is connected with a control oil port of the third cut-off isolating valve and the fourth cut-off isolating valve.
In one embodiment, the hydraulic control circuit further comprises an overflow valve and a fifth cut-off isolation valve, the second cut-off isolation valve and the fourth cut-off isolation valve are further connected with the hydraulic oil tank through the fifth cut-off isolation valve and the overflow valve, and a control oil port of the fifth cut-off isolation valve is connected with a working oil port a of the reversing valve, which connects the first cut-off isolation valve and the second cut-off isolation valve.
In one embodiment, the hydraulic control circuit further includes a first check valve and a second check valve, oil inlets of the first check valve and the second check valve are both connected to an oil outlet of the second auxiliary power source, an oil outlet of the first check valve is connected to a first oil port of the hydraulic pump, and an oil outlet of the second check valve is connected to a second oil port of the hydraulic pump.
In one embodiment, the hydraulic control system further comprises a controller, and the controller is in control connection with the speed regulating motor, the hydraulic pump and the hydraulic actuating element.
The transmission system of the stepping mechanism and the energy recovery system thereof have at least the following advantages:
the variable frequency driving unit controls the speed regulating motor to drive the hydraulic pump to operate, volume speed regulation control is carried out on the hydraulic actuating element of the stepping mechanism, and the hydraulic actuating element is driven to act, so that the working pressure can be changed along with the load, the load weight under different working conditions can be automatically matched, the throttling loss is avoided, the energy-saving effect is achieved, and the control and the structure are simple. When a hydraulic actuating element of the stepping mechanism descends or performs translational braking, the hydraulic actuating element drives the speed regulating motor to be in a power generation state, so that potential energy and/or kinetic energy of the hydraulic actuating element are converted into electric energy which is transmitted to the energy recovery device through the variable frequency driving unit for recycling, the energy-saving effect is good, and the investment and operation cost is low. In addition, this transmission system and energy recuperation system of marching type mechanism still possess area little, load repayment power change strong adaptability, efficient advantage such as simple of control, in addition to transforming the project, this patent is implemented simply, need not to revise the civil engineering and the equipment structure of marching type mechanism.
Drawings
Fig. 1 is a schematic diagram of a hydraulic control system according to an embodiment of the present invention;
FIG. 2 is a partial schematic illustration of a schematic diagram of the hydraulic control system of FIG. 1;
FIG. 3 is a schematic structural diagram of the frequency conversion driving unit in FIG. 1 being a four-quadrant frequency converter;
fig. 4 is a schematic structural diagram of the frequency conversion driving unit in fig. 1 being a two-quadrant frequency converter.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be embodied in many other forms than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, a transmission system of a stepping mechanism in an embodiment is mainly used for a stepping heating furnace, and can also be used for transmission control of a stepping feeding rack, a stepping steel coil transportation beam, and the like. Specifically, the transmission system of the step-by-step mechanism includes a hydraulic oil tank 100, an auxiliary power source 200, an energy recovery system 300, a hydraulic actuator 400, and a hydraulic control circuit 500.
The hydraulic oil tank 100 is used to supply hydraulic oil. The auxiliary power source 200 is used to draw hydraulic oil in the hydraulic oil tank 100. Specifically, the auxiliary power source 200 includes a first auxiliary power source 210 and a second auxiliary power source 220, and oil inlets of the first auxiliary power source 210 and the second auxiliary power source 220 are connected to the oil tank 100. The first auxiliary power source 210 is a high-pressure small-flow constant-pressure hydraulic source, and the second auxiliary power source 220 is a low-pressure constant-pressure hydraulic source.
The energy recovery system 300 includes a hydraulic power unit 310, a variable frequency drive unit 320, and an energy recovery device 330. The hydraulic oil drawn by the auxiliary power source 200 is used as the oil supply for the hydraulic power unit 310 and as the control oil for the hydraulic control circuit 500. Specifically, in the present embodiment, the hydraulic oil pumped by the first auxiliary power source 210 is used as the control oil of the hydraulic control circuit 500, and the hydraulic oil pumped by the second auxiliary power source 220 is used as the supplement oil of the hydraulic power unit 310.
The hydraulic power unit 310 includes a variable speed motor 312 and a hydraulic pump 314, and the variable speed motor 312 is connected to the hydraulic pump 314 to drive the hydraulic pump 314 to operate. Specifically, the speed-regulating motor 312 is a servo motor or a variable frequency motor, and the speed-regulating motor 312 is coaxially connected with the hydraulic pump 314 through a coupler. The hydraulic pump 314 is a closed variable hydraulic pump, and the hydraulic pump 314 may be a fixed displacement pump with a double rotary direction.
The variable frequency driving unit 320 is connected to the adjustable speed motor 312, and the variable frequency driving unit 320 controls the adjustable speed motor 312 to drive the hydraulic pump 314 to operate, so as to drive the hydraulic actuator 400 to operate. The variable frequency driving unit 320 controls the variable speed motor 312 to drive the hydraulic pump 314 to operate, so as to perform volume speed regulation control on the hydraulic actuator 400, and therefore the working pressure can be changed along with load change. The energy recovery device 330 is connected to the variable frequency drive unit 320. When the hydraulic actuator 400 is braked or lowered, the hydraulic actuator 400 can drive the speed-regulating motor 312 to be in a power generation state, so that potential energy and/or kinetic energy of the hydraulic actuator 400 is converted into electric energy, and the electric energy is transmitted to the energy recovery device 330 through the variable-frequency driving unit 320 for reuse.
Referring to fig. 3 and fig. 4, specifically, the variable frequency driving unit 320 may be a frequency converter or a servo driver, and when the variable frequency driving unit 320 is a frequency converter, the adjustable speed motor 312 is a variable frequency motor; when the variable frequency driving unit 320 is a servo driver, the adjustable speed motor 312 is a servo motor. In this embodiment, the variable frequency driving unit 320 is a frequency converter, and when the variable frequency driving unit 320 is a four-quadrant frequency converter, the energy recovery device 330 is the four-quadrant frequency converter itself, and the energy is fed back to the power grid for other devices to use. When the variable frequency driving unit 320 is a two-quadrant frequency converter, the energy recovery device 330 is a super capacitor.
Both ends of the hydraulic oil path of the hydraulic actuator 400 are connected to two oil ports of the hydraulic pump 314, respectively. Specifically, the hydraulic actuator 400 includes a translational hydraulic cylinder 420 and a lifting hydraulic cylinder 410, two oil ports of the lifting hydraulic cylinder 410 are respectively connected with two oil ports of the hydraulic pump 314 through pipelines, and the translational hydraulic cylinder 420 is connected in parallel with the lifting hydraulic cylinder 410. In this embodiment, the two sets of hydraulic lifting cylinders 410 are provided, the two sets of hydraulic lifting cylinders 410 are arranged in parallel, and the two sets of hydraulic lifting cylinders 410 can ensure the stable process of lifting the workpiece 20. Of course, the two sets of hydraulic lift cylinders 410 are not necessary, and the specific number of hydraulic lift cylinders 410 may be specifically set as desired.
Referring also to fig. 2, a hydraulic control circuit 500 is provided for selecting and controlling the hydraulic actuator 400. Specifically, the hydraulic control circuit 500 includes a directional valve 510, a first block isolation valve 520, a second block isolation valve 530, a third block isolation valve 540, and a fourth block isolation valve 550. The two oil ports of the hydraulic pump 314 are a first oil port a and a second oil port b, wherein the oil port on the left side of the hydraulic pump 314 is the first oil port a, and the oil port on the right side of the hydraulic pump 314 is the second oil port b. The first port a of the hydraulic pump 314 is connected to the rodless chamber port of the hydraulic cylinder 410 through a first block isolation valve 520, and the rod chamber port of the hydraulic cylinder 410 is connected to the second port b of the hydraulic pump 314 through a second block isolation valve 530. Meanwhile, the first port a of the hydraulic pump 314 is connected to one port of the translational hydraulic cylinder 420 through the third block isolation valve 540, and the other port of the translational hydraulic cylinder 420 is connected to the second port b of the hydraulic pump 314 through the fourth block isolation valve 550. An oil inlet of the reversing valve 510 is connected with an oil outlet of the first auxiliary power source 210, an oil return port of the reversing valve 510 is connected with the hydraulic oil tank 100, one of working oil ports a of the reversing valve 510 is connected with control oil ports of the first cut-off isolating valve 520 and the second cut-off isolating valve 530, and the other working oil port B of the reversing valve 510 is connected with control oil ports of the third cut-off isolating valve 540 and the fourth cut-off isolating valve 550.
In the present embodiment, the translational hydraulic cylinder 420 is a symmetric hydraulic cylinder, and therefore, theoretically, oil supplementation is not required in the process of operation. The hydraulic lift cylinders 410 are not symmetrical cylinders and require oil replenishment and return to the hydraulic power unit 310 during operation. The hydraulic control circuit 500 further includes a fifth block and isolation valve 560 and a relief valve 570, and the second block and isolation valve 530 and the fourth block and isolation valve 550 are further connected to the hydraulic oil tank 100 through the fifth block and isolation valve 560 and the relief valve 570. The control port of the fifth block and isolation valve 560 is connected to the working port a of the reversing valve 510 which connects the first block and isolation valve 520 and the second block and isolation valve 530.
Further, the hydraulic control circuit 500 further includes a first check valve 580 and a second check valve 590, oil inlets of the first check valve 580 and the second check valve 590 are both connected with an oil outlet of the second auxiliary power source 220, an oil outlet of the first check valve 580 is connected with a first oil port a of the hydraulic pump 314, and an oil outlet of the second check valve 590 is connected with a second oil port b of the hydraulic pump 314.
In this embodiment, the transmission system of the step-by-step mechanism further includes a controller 600, the controller 600 is connected to the speed regulating motor 312, the hydraulic pump 314 and the hydraulic actuator 400 in a control manner, and the controller 600 performs transmission control operation on the hydraulic actuator 400 through the speed regulating motor 312 and the hydraulic pump 314 to realize a target motion curve. Specifically, the controller 600 is connected to position sensors on the translational hydraulic cylinder 420 and the lifting hydraulic cylinder 410, and by calculating the current position sensor state, the rotation speed or direction of the governor motor 312 and the displacement or direction of the hydraulic pump 314 are changed, so as to realize the transmission control of the hydraulic actuator 400. The controller 600 is preferably a PLC controller.
The working process of the transmission system of the stepping mechanism is roughly divided into four processes of ascending, translation, descending and resetting, and the working process is as follows:
first, the hydraulic lift cylinder 410 is raised. The specific process is as follows: the first auxiliary power source 210 draws hydraulic oil from the hydraulic oil tank 100, the drawn hydraulic oil enters the direction switching valve 510, the direction switching valve 510 controls the first cut-off isolation valve 520 and the second cut-off isolation valve 530 to be opened, and the oil path between the hydraulic cylinder 410 and the hydraulic pump 314 is opened. The hydraulic oil pumped by the second auxiliary power source 220 enters the hydraulic pump 314 through the first check valve 580 and the second check valve 590. The variable frequency driving unit 320 controls the speed regulating motor 312 to drive the hydraulic pump 314 to operate, and drives the lifting hydraulic cylinder 410 to ascend. At this time, the hydraulic oil from the first oil port a of the hydraulic pump 314 enters the rodless cavity of the hydraulic cylinder 410, drives the piston rod of the hydraulic cylinder 410 to ascend, and further drives the load platform 10 to ascend. The hydraulic oil in the rod cavity of the hydraulic cylinder 410 is supplied to the hydraulic pump 314 through the second block isolation valve 530, and the oil needs to be supplemented from the second auxiliary power source 220 at this time due to the asymmetric area, and the specific oil needing to be supplemented is led out from the second auxiliary power source 220 and is supplemented to the second oil port b of the hydraulic pump 314 through the second check valve 590. After the load platform 10 receives the workpiece 20, since the variable frequency driving unit 320 controls the variable speed motor 312 to drive the hydraulic pump 314 to operate, so as to continue the volume speed regulation control of the lifting hydraulic cylinder 410, the working pressure of the lifting hydraulic cylinder 410 can be changed along with the change of the load. After the workpiece 20 is lifted to a predetermined height, the controller 600 controls the lifting cylinder 410 to stop moving.
Then, the translation hydraulic cylinder 420 drives the workpiece 20 and the like to translate. The specific process is as follows: the first auxiliary power source 210 draws hydraulic oil from the hydraulic oil tank 100, the hydraulic oil enters the direction switching valve 510, the direction switching valve 510 controls the third cut-off isolation valve 540 and the fourth cut-off isolation valve 550 to open, the oil path between the translational hydraulic cylinder 420 and the hydraulic pump 314 to open, the first cut-off isolation valve 520, the second cut-off isolation valve 530, and the fifth cut-off isolation valve 560 to close, and the oil path between the lift cylinder 410 and the hydraulic pump 314 to close.
At this time, the variable frequency driving unit 320 controls the variable speed motor 312 to drive the hydraulic pump 314 to operate, and drives the translational hydraulic cylinder 420 to translate rightward. At this time, the hydraulic oil from the first port a of the hydraulic pump 314 enters one chamber of the translational hydraulic cylinder 420, drives the piston rod of the translational hydraulic cylinder 420 to move, further drives the workpiece 20 and the like to move rightward, and the hydraulic oil in the other chamber of the translational hydraulic cylinder 420 returns to the hydraulic pump 314 through the fourth block isolation valve 550.
When the workpiece 20 and the like are pushed to a proper position, the controller 600 controls the translational hydraulic cylinder 420 to brake, the torque of the speed regulating motor 312 is reversed, the translational hydraulic cylinder 420 drives the hydraulic pump 314 to drive the speed regulating motor 312 to be in a power generation state, the kinetic energy of the translational hydraulic cylinder 420 is converted into electric energy through the speed regulating motor 312 and transmitted to the variable frequency driving unit 320, and the variable frequency driving unit 320 transmits the electric energy to the energy recovery device 330 for reuse.
Again, the hydraulic lift cylinder 410 is lowered. The specific process is as follows: the first auxiliary power source 210 draws the hydraulic oil in the hydraulic oil tank 100, the drawn hydraulic oil enters the direction switching valve 510, the direction switching valve 510 controls the first cut-off isolation valve 520, the second cut-off isolation valve 530, and the fifth cut-off isolation valve 560 to open, the oil path between the lift cylinder 410 and the hydraulic pump 314 is opened, the third cut-off isolation valve 540 and the fourth cut-off isolation valve 550 are closed, and the oil path between the pan cylinder 420 and the hydraulic pump 314 is closed. The variable frequency driving unit 320 controls the speed regulating motor 312 to drive the hydraulic pump 314 to operate, and drives the lifting hydraulic cylinder 410 to descend, and the load platform 10 and the workpiece 20 also descend synchronously. At this time, the high-pressure hydraulic oil generated by the gravitational potential energy of the loading platform 10 and the workpiece 20 flows to the second port b through the first port a of the hydraulic pump 314, and the hydraulic pump 314 is in a motor state. The hydraulic oil from the second port b of the hydraulic pump 314 partially enters the rod chamber of the hydraulic cylinder 410, and the other part returns to the oil tank 100 through the fifth block and isolation valve 560 and the overflow valve 570.
In the descending process of the lifting hydraulic cylinder 410, the lifting hydraulic cylinder 410 drives the hydraulic pump 314 to drive the speed regulating motor 312 to be in a power generation state, the potential energy and the kinetic energy obtained by the lifting hydraulic cylinder 410 drive the speed regulating motor 312 through the hydraulic pump 314 to be converted into electric energy which is transmitted to the variable frequency driving unit 320, and the variable frequency driving unit 320 transmits the electric energy to the energy recovery device 330 for reuse. When the workpiece 20 is lowered to a predetermined height, the load platform 10 is separated from the workpiece 20, and the hydraulic lift cylinder 410 continues to be lowered until it returns to its original position for lifting.
Finally, the descending stepping mechanism starts a reset action, which is a translational reverse motion, at this time, the hydraulic pump 314 reverses or reverses, high-pressure hydraulic oil flows out from the second oil port b of the hydraulic pump 314 to push the translational hydraulic cylinder 420 to drive the workpiece 20 to move leftwards, and low-pressure oil in the other cavity of the translational hydraulic cylinder returns to the hydraulic pump 314 through the third cut-off isolation valve 540 to form closed transmission.
Similarly, when the workpiece 20 and the like are pushed to the initial position, the controller 600 controls the translational hydraulic cylinder 420 to brake, at this time, the torque of the speed regulating motor 312 is reversed, the translational hydraulic cylinder 420 drives the hydraulic pump 314 to drive the speed regulating motor 312 to be in a power generation state, the kinetic energy of the translational hydraulic cylinder 420 is converted into electric energy through the speed regulating motor 312 and transmitted to the variable frequency driving unit 320, and the variable frequency driving unit 320 transmits the electric energy to the energy recovery device 330 for reuse.
And finishing the action of one stepping period, and waiting for the next stepping period to repeat the transmission control mode.
In the transmission system of the stepping mechanism and the energy recovery system 300 thereof, the variable frequency driving unit 320 drives the hydraulic pump 314 to operate through the speed regulation motor 312, so as to perform volume speed regulation control on the lifting hydraulic cylinder 410 and the horizontal hydraulic cylinder 420, therefore, the working pressure can be changed along with the load, the load weight under different working conditions can be automatically matched, the throttling loss is avoided, and the energy-saving effect is achieved, and the control and the structure are simple. When the lifting hydraulic cylinder 410 descends and the horizontal hydraulic cylinder 420 brakes, the corresponding hydraulic cylinder drives the speed regulating motor 312 to be in a power generation state, potential energy and/or kinetic energy of the hydraulic cylinder are converted into electric energy to be transmitted to the variable frequency driving unit 320, the variable frequency driving unit 320 transmits the electric energy to the energy recovery device 330 for recycling, the energy saving effect is good, and the investment and operation cost is low. In addition, the control and energy feedback are performed on the lifting hydraulic cylinder 410, and the same transmission control and energy feedback are performed on the translation hydraulic cylinder 420, so that further energy saving is realized.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An energy recovery system, comprising:
the hydraulic power unit comprises a speed regulating motor and a hydraulic pump, and the speed regulating motor is connected with the hydraulic pump;
the variable frequency driving unit is connected with the speed regulating motor;
the energy recovery device is connected with the variable-frequency driving unit;
the variable frequency driving unit controls the speed regulating motor to drive the hydraulic pump to operate and drive the hydraulic actuating element to act; when the hydraulic actuating element descends or brakes, the hydraulic actuating element drives the speed regulating motor to be in a power generation state, so that potential energy and/or kinetic energy of the hydraulic actuating element are converted into electric energy, and the electric energy is transmitted to the energy recovery device through the variable-frequency driving unit for reuse.
2. The energy recovery system of claim 1 wherein when the variable frequency drive unit is a four-quadrant inverter, the energy recovery device is the four-quadrant inverter itself, with energy fed back to the grid.
3. The energy recovery system of claim 1, wherein when the variable frequency drive unit is a two quadrant inverter, the energy recovery device is a supercapacitor.
4. A step-by-step mechanism transmission system, comprising:
a hydraulic oil tank;
the auxiliary power source is used for extracting hydraulic oil in the hydraulic oil tank;
an energy recovery system as claimed in any one of claims 1 to 3;
the two ends of the hydraulic actuating element oil path are respectively connected with the two oil ports of the hydraulic pump; and
a hydraulic control circuit for selecting and controlling the hydraulic actuators;
and the hydraulic oil extracted by the auxiliary power source is used as the oil supplement of the hydraulic power unit and as the control oil of the hydraulic control circuit.
5. The step-by-step mechanism transmission system according to claim 4, wherein the hydraulic actuator comprises a translational hydraulic cylinder and a lifting hydraulic cylinder, and the translational hydraulic cylinder is connected in parallel with the lifting hydraulic cylinder.
6. The step-by-step mechanism transmission system according to claim 5, wherein the auxiliary power source includes a first auxiliary power source that draws hydraulic oil as the control oil of the hydraulic control circuit and a second auxiliary power source that draws hydraulic oil as the supplementary oil of the hydraulic power unit.
7. The step-by-step mechanism transmission system of claim 6, wherein the hydraulic control circuit includes a reversing valve, a first block isolation valve, a second block isolation valve, a third block isolation valve, and a fourth block isolation valve;
the two oil ports of the hydraulic pump are respectively a first oil port and a second oil port, the first oil port of the hydraulic pump is connected with the rodless cavity oil port of the lifting hydraulic cylinder through the first cut-off isolation valve, and the rod cavity oil port of the lifting hydraulic cylinder is connected with the second oil port of the hydraulic pump through the second cut-off isolation valve;
a first oil port of the hydraulic pump is connected with one oil port of the translational hydraulic cylinder through the third cut-off isolation valve, and the other oil port of the translational hydraulic cylinder is connected with a second oil port of the hydraulic pump through the fourth cut-off isolation valve;
an oil inlet of the reversing valve is connected with an oil outlet of the first auxiliary power source, an oil return port of the reversing valve is connected with a hydraulic oil tank, one working oil port A of the reversing valve is connected with a control oil port of the first cut-off isolating valve and the second cut-off isolating valve, and the other working oil port B of the reversing valve is connected with a control oil port of the third cut-off isolating valve and the fourth cut-off isolating valve.
8. The transmission system of a step-by-step mechanism according to claim 7, wherein the hydraulic control circuit further comprises an overflow valve and a fifth block isolation valve, the second block isolation valve and the fourth block isolation valve are further connected with the hydraulic oil tank through the fifth block isolation valve and the overflow valve, and a control oil port of the fifth block isolation valve is connected with a working oil port A of the reversing valve which connects the first block isolation valve and the second block isolation valve.
9. The transmission system of the step-by-step mechanism according to claim 8, wherein the hydraulic control circuit further includes a first check valve and a second check valve, oil inlets of the first check valve and the second check valve are both connected to an oil outlet of the second auxiliary power source, an oil outlet of the first check valve is connected to a first oil port of the hydraulic pump, and an oil outlet of the second check valve is connected to a second oil port of the hydraulic pump.
10. The transmission system of a step-by-step mechanism according to claim 4, further comprising a controller, wherein the controller is in control connection with the speed regulating motor, the hydraulic pump and the hydraulic actuator.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030235A (en) * | 2019-05-27 | 2019-07-19 | 彭友斌 | The transmission system and its energy recycling system of step-by-step movement mechanism |
| CN114294275A (en) * | 2021-12-31 | 2022-04-08 | 中冶赛迪技术研究中心有限公司 | Hydraulic control system of walking beam furnace |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030235A (en) * | 2019-05-27 | 2019-07-19 | 彭友斌 | The transmission system and its energy recycling system of step-by-step movement mechanism |
| CN114294275A (en) * | 2021-12-31 | 2022-04-08 | 中冶赛迪技术研究中心有限公司 | Hydraulic control system of walking beam furnace |
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