CN216599128U - Power supply system based on tower crane - Google Patents
Power supply system based on tower crane Download PDFInfo
- Publication number
- CN216599128U CN216599128U CN202220024221.2U CN202220024221U CN216599128U CN 216599128 U CN216599128 U CN 216599128U CN 202220024221 U CN202220024221 U CN 202220024221U CN 216599128 U CN216599128 U CN 216599128U
- Authority
- CN
- China
- Prior art keywords
- power supply
- unit
- tower crane
- energy
- rope
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control And Safety Of Cranes (AREA)
Abstract
The utility model is suitable for the technical field of construction equipment of construction sites, and provides a power supply system based on a tower crane, which comprises a tower frame, a first power supply mechanism and a second power supply mechanism; the first power supply mechanism comprises a lifting motor, a lifting rope, an energy recovery unit and an energy storage unit; the hoisting motor or the hoisting rope is in transmission connection with the energy recovery unit; the energy recovery unit is connected with the energy storage unit, and the energy storage unit is connected with a power supply line of electric equipment on the tower crane; the second power supply mechanism comprises a rectifying unit arranged on the ground surface and a first inversion unit arranged on the tower; the input end of the rectifying unit is connected with an alternating current power supply end; the output end of the first inversion unit is connected with a power supply line of electric equipment on the tower crane; the input end of the first inversion unit is connected with the output end of the rectification unit through a positive direct current bus and a negative direct current bus; the cable that this tower crane needs is with low costs, can collect the whereabouts potential energy of heavy object and regard as the deposit energy.
Description
Technical Field
The utility model relates to a building site construction equipment technical field, concretely relates to power supply system based on tower crane.
Background
The tower crane is the most common hoisting equipment on the construction site, is also called as a tower crane, is used for hoisting construction raw materials such as reinforcing steel bars, wood ridges, concrete, steel pipes and the like for construction, and belongs to essential construction equipment on the construction site.
In order to meet the construction requirements, the height of the tower crane is generally more than one hundred meters, so that suspended heavy objects hoisted by the tower crane have very large gravitational potential energy, and the large gravitational potential energy makes it difficult to control how many meters the steel wire rope (used for hoisting the heavy objects) falls down on one hand, and on the other hand, the heavy objects are difficult to keep a stable and slow speed to fall down; but also the gravitational potential energy of the weight.
The frequency converter is an electric energy control device which converts constant-voltage constant-frequency electric energy into variable-voltage variable-frequency electric energy by utilizing the on-off action of an electric semiconductor device. At present, a general frequency converter mostly adopts a diode rectification unit and a PWM inverter to form an AC-DC-AC voltage type variable frequency converter; sequentially comprises the following steps: the PWM inverter comprises a filtering unit, a rectifying unit connected with the filtering unit and a PWM inverter connected with a positive direct current bus and a negative direct current bus of the rectifying unit.
However, in some special application scenarios, the use of a general frequency converter will additionally increase the production cost; for example, in the tower crane construction process, the electric equipment is arranged above the tower crane, and the power grid or the generator is arranged on the ground surface. Because the height of tower crane is than higher, locate the earth's surface with the converter, just need be connected U, V, W, zero line, five cables of PE line between the consumer on converter and the tower crane, because the height of tower crane is than higher, these five cables also can be than longer, lead to the cost-push of using the cable.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power supply system based on tower crane aims at providing a cable is with low costs, can collect the whereabouts potential energy of heavy object and regard as the deposit energy, and makes the more steady slow tower crane of heavy object whereabouts process.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a power supply system based on a tower crane comprises a tower, a first power supply mechanism and a second power supply mechanism;
the first power supply mechanism comprises a lifting motor, a lifting rope, an energy recovery unit and an energy storage unit;
the upper part of the tower frame is connected with a suspension arm through a turntable;
the suspension arm is provided with a track laid along the length direction of the suspension arm; the load-carrying trolley is slidably arranged on the track;
a rotating shaft of the lifting motor is wound and connected with the head end of a lifting rope, the lifting rope is usually a steel wire rope, the tail end of the lifting rope is provided with a lifting hook for hooking a heavy object, and the energy recovery unit is connected with the lifting motor; the suspension arm rotates around the turntable, and the load-carrying trolley moves along the track to enable the lifting hook to be positioned above the heavy object so that the lifting hook can lift the heavy object; in the falling process of the heavy object, the energy recovery unit can convert the lowering potential energy of the heavy object into electric energy; the energy recovery unit is connected with the energy storage unit, and the energy storage unit is connected with a power supply line of electric equipment on the tower crane; the energy storage unit is a storage battery or a super capacitor;
the tower crane can convert the falling potential energy of the weight into electric energy in the process of putting down the weight, and store the electric energy in the energy storage unit; on one hand, energy is collected, on the other hand, the falling of the heavy object is more stable (because a part of gravitational potential energy is converted into electric energy), and the paying-off of the hoisting rope is also convenient to control.
The second power supply mechanism comprises a rectifying unit arranged on the ground surface and a first inversion unit arranged on the tower; the input end of the rectifying unit is connected with an alternating current power supply end; the rectifying unit is used for receiving alternating current output by the alternating current power supply end and rectifying the alternating current to output direct current; the rectifying unit can be a three-phase rectifying module or a single-phase rectifying module; the rectification part of the rectification unit can adopt a three-phase bridge type uncontrollable rectifier or a three-phase bridge type PWM rectifier; the alternating current power supply end is a three-phase alternating current power supply end, and specifically can be a power grid or a three-phase alternating current generator;
the output end of the first inversion unit is connected with a power supply circuit of electric equipment on the tower crane; the input end of the first inversion unit is connected with the output end of the rectification unit through a positive direct current bus and a negative direct current bus. The first inversion unit is used for inverting the direct current to output alternating current to a load, and the first inversion unit can adopt a circuit structure of an IGBT or IPM three-phase bridge inverter which outputs PWM waveforms and the like; it is known in the art to integrate the rectifying unit with the first inverting unit and electrically connect the two together.
Originally, the electric wire netting is at the earth's surface, and the converter is installed above the tower crane, has R, S, T, zero line, five cables of PE line to and the ground wire of converter shell ground connection between the converter that extends to the top from the earth's surface electric wire netting. In the tower crane, only one PE wire is additionally arranged between the positive and negative cables extending from the earth surface power grid to the frequency converter above, and compared with the prior art, two cables are omitted, so that the cost of two long cables is reduced; in addition, originally, the AC cable extends to the position above the tower crane from the ground power grid, the DC cable is connected between the inversion units on the tower crane from the rectification unit on the ground, and the three-phase AC is rectified and converted into DC voltage and then boosted, so that the current passing through the DC cable is smaller under the condition of the same power, and the wire diameter required by the DC cable is smaller.
Furthermore, the positive and negative direct current buses are provided with first switches for controlling the on-off of the positive and negative direct current buses, and the three-phase power input line of the rectifying unit is provided with second switches for controlling the on-off of the three-phase power input line. The first switch and the second switch are circuit breakers with thermal trips and magnetic trips; the first switch and the second switch are electrically connected with the controller, the controller can be a computer, and a user controls the first switch and the second switch through the computer to realize the on-off and open-circuit protection of the positive and negative direct current buses.
The rectifier further comprises a first filtering unit, wherein the first filtering unit is arranged between the rectifying unit and the first inverter unit; the smoothing filter is used for smoothing the voltage output by the rectifying unit; a second filtering unit is optionally arranged between the rectifying unit and the alternating current power supply end; for preventing electromagnetic interference; the second filtering unit may be an LC filter composed of a capacitor and an inductor. The first filtering unit and the second filtering unit are combined for use, so that the stability of alternating current can be improved, the load is effectively prevented from being impacted, and the service life of the load is prolonged.
Furthermore, the energy recovery unit is an energy feedback unit connected with a lifting motor; the energy feedback unit is a special energy feedback unit for the frequency converter; when the heavy object falls down, the heavy object drives the rotating shaft of the lifting motor to rotate through the lifting rope, and electric energy generated by the rotation of the rotating shaft of the lifting motor is input into the energy storage unit through the energy feedback unit; energy is saved and braking is facilitated.
Furthermore, the energy recovery unit is a generator, the first power supply mechanism further comprises a rope winding drum, the hoisting rope main body is wound on the rope winding drum, and a rotor of the generator is in transmission connection with the rope winding drum or the hoisting rope.
Specifically, the generator may be in transmission with a hoisting rope, the hoisting rope moves to drive the rotor to rotate, or may be in transmission connection with a rope drum, when the heavy object falls, the rope drum rotates to drive the rotor to rotate, and the position is not particularly limited; so as to convert the falling potential energy of the heavy object into electric energy and supply the electric energy to electric equipment through a power supply line. In general, a power supply line of an electric device is connected with a mains supply, an energy storage unit is used as a standby energy source, and when power is cut off or power consumption is in a peak period, the energy storage unit is used for providing electric energy for the electric device.
Further, a rotating shaft of the rope winding drum is in transmission connection with a rotor of the generator; the lifting hook is hooked with a weight, and the rotating shaft of the rope winding drum is driven to rotate in the falling process of the weight and drives the rotor of the generator to rotate so as to generate electricity.
Further, the rotating shaft of the rope winding drum is in transmission connection with the rotor of the generator through a speed change gear set; the speed change gear set is used for changing low-speed large torque transmitted from a rotating shaft of the rope reel into high-speed small torque through a series of gear combinations, and transmitting the high-speed small torque to a rotor of the generator so as to play a role in transmitting the torque; since the rotation speed of the rotating shaft of the rope reel may not reach the rotation speed required by the rotor of the generator, the speed is increased through the speed change gear set.
Furthermore, the rotating shaft of the rope winding drum is in transmission connection with the rotor of the generator through a ratchet mechanism; the ratchet mechanism is used for enabling the rotating shaft of the rope winding drum to transmit torque to the rotor of the generator only when the heavy object falls down; the ratchet wheel can only rotate towards one direction but can not rotate reversely, when the heavy object falls down, the ratchet wheel is driven to rotate, and the ratchet wheel drives the generator rotor to rotate; when the heavy object is lifted, the rotating shaft of the rope winding drum does not transmit torque to the generator, so that the energy consumption of the lifting motor is reduced.
The speed change gear set comprises a driving gear and a driven gear which are meshed with each other; the number of teeth of the driving gear is greater than that of the driven gear; the driving gear is arranged on a rotating shaft of the rope reel, the driven gear is arranged on a speed change gear transmission shaft, and the speed change gear transmission shaft is in transmission connection with a rotor of the generator; specifically, one end of a transmission shaft of the speed change gear is hollow, a ratchet mechanism is arranged at the hollow end of the transmission shaft of the speed change gear, and a rotor of the generator is in transmission connection with the ratchet; when the weight on the hook is pulled up, the ratchet wheel does not transmit torque to the rotor, so that the energy consumption of the lifting motor is reduced.
Further, the device also comprises a controller, a first contactor and a second contactor;
the first contactor is arranged between commercial power and a power supply circuit of electric equipment on the tower crane and is used for controlling the connection and disconnection between the commercial power and the power supply circuit;
the second contactor is arranged between the energy storage unit and a power supply circuit of electric equipment on the tower crane and is used for controlling the on-off of the energy storage unit and the power supply circuit;
the controller can control the opening and closing of the first contactor and the second contactor.
In general, a power supply line of an electric device is connected with a mains supply, an energy storage unit is used as a standby energy source, and the energy storage unit is used for supplying power to the electric device when power is cut off or power consumption is in a peak period. The controller can be a computer, a timing module is arranged in the computer, and the controller controls the first contactor and the second contactor to be opened and closed according to the timing module. If the peak period of electricity utilization is from 9 pm to 12 pm on a certain day; when 6 o' clock at night, the computer receives the signal of the timing module to control the first contactor to be disconnected, the second contactor to be closed and the energy storage unit to supply power; after 12 points, the computer receives the signal of the timing module to control the second contactor to be disconnected and the first contactor to be closed; so as to achieve the purposes of staggering peak power utilization, saving energy and reducing emission.
Furthermore, a current transformer is arranged between the generator and the energy storage unit, and a second inversion unit is arranged between the energy storage unit and a power supply circuit of electric equipment on the tower crane; if the generator is a direct current generator, the converter is a DC-DC converter; if an alternator, the converter is an AC-DC converter;
the converter is used for converting the electric energy voltage converted by the generator into an electric energy voltage suitable for being stored by the energy storage unit;
the second inversion unit is used for converting the direct current of the energy storage unit into alternating current used by electric equipment.
The utility model has the advantages that:
1. the tower crane can convert the falling potential energy of the weight into electric energy in the process of putting down the weight, and store the electric energy in the energy storage unit; on one hand, energy is collected, on the other hand, the falling of the heavy object is more stable (because a part of gravitational potential energy is converted into electric energy), and the paying-off of the hoisting rope is convenient to control;
2. the tower crane can use the energy storage unit to supply power in the period of power failure or power peak so as to achieve the purposes of peak-shifting power utilization, energy conservation and emission reduction;
in general, a power supply line of an electric device is connected with a mains supply, an energy storage unit is used as a standby energy source, and the energy storage unit is used for supplying power to the electric device when power is cut off or power consumption is in a peak period. The controller can be a computer, a timing module is arranged in the computer, and the controller controls the first contactor and the second contactor to be opened and closed according to the timing module. If the peak period of electricity utilization is from 9 pm to 12 pm on a certain day; when 6 o' clock at night, the computer receives the signal of the timing module to control the first contactor to be disconnected, the second contactor to be closed and the energy storage unit to supply power; after 12 points, the computer receives the signal of the timing module to control the second contactor to be disconnected and the first contactor to be closed; the purposes of staggering power utilization, saving energy and reducing emission are achieved;
3. the tower crane can reduce the cable cost and the wiring difficulty, and has a wide application range;
when the tower crane is constructed, an original power grid is on the ground, the frequency converter is arranged above the tower crane, R, S, T, a zero line, five PE (polyethylene) cables and a grounding wire of a shell of the frequency converter are arranged between the frequency converters extending from the power grid on the ground to the upper part; in the tower crane, only one PE wire is additionally arranged between the positive and negative cables extending from the earth surface power grid to the frequency converter above, and compared with the prior art, two cables are omitted, so that the cost of two long cables is reduced, and the wiring difficulty is also reduced; in addition, originally, the AC cable extends to the position above the tower crane from the ground power grid, the DC cable is connected between the inversion units on the tower crane from the rectification unit on the ground, and the three-phase AC is rectified and converted into DC voltage and then boosted, so that the current passing through the DC cable is smaller under the condition of the same power, and the wire diameter required by the DC cable is smaller.
In conclusion, the cable required by the tower crane is low in cost, and can collect the falling potential energy of the heavy object and serve as a reserve energy source, and the falling process of the heavy object is more stable and slower.
Drawings
FIG. 1 is a schematic structural diagram of a tower crane;
FIG. 2 is a schematic view of the structure of the rope reel and the generator portion;
FIG. 3 is an enlarged partial view of a portion of the speed change gear set and the speed change gear drive shaft;
FIG. 4 is a schematic topological diagram of a tower crane;
fig. 5 is a schematic view of a second power supply mechanism portion.
In the figure: 1. a tower; 2. a generator; 3. a hook; 4. a rectifying unit; 5. a first inverter unit; 6. a first switch; 7. a second switch; 8. a first filtering unit; 9. a rope reel; 10. a speed change gear set; 11. a ratchet mechanism; 12. a first contactor; 13. a second contactor; 14. a speed change gear drive shaft.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 5, a power supply system based on a tower crane includes a tower frame 1, a first power supply mechanism and a second power supply mechanism;
the first power supply mechanism comprises a lifting motor, a lifting rope, an energy recovery unit and an energy storage unit;
the upper part of the tower frame 1 is connected with a suspension arm through a turntable;
the suspension arm is provided with a track laid along the length direction of the suspension arm; the load-carrying trolley is slidably arranged on the track;
a rotating shaft of the lifting motor is wound and connected with the head end of a lifting rope, the lifting rope is usually a steel wire rope, a lifting hook 3 for hooking a heavy object is arranged at the tail end of the lifting rope, and the energy recovery unit is connected with the lifting motor; the suspension arm rotates around the turntable, and the load-carrying trolley moves along the track to enable the lifting hook 3 to be positioned above the heavy object, so that the lifting hook 3 lifts the heavy object; in the falling process of the heavy object, the energy recovery unit can convert the lowering potential energy of the heavy object into electric energy; the energy recovery unit is connected with the energy storage unit, and the energy storage unit is connected with a power supply line of electric equipment on the tower crane; the energy storage unit is a storage battery or a super capacitor;
the tower crane can convert the falling potential energy of the weight into electric energy in the process of putting down the weight, and store the electric energy in the energy storage unit; on one hand, energy is collected, on the other hand, the falling of the heavy object is more stable (because a part of gravitational potential energy is converted into electric energy), and the paying-off of the hoisting rope is also convenient to control.
The second power supply mechanism comprises a rectifying unit 4 arranged on the ground surface and a first inverter unit 5 arranged on the tower frame 1; the input end of the rectifying unit 4 is connected with an alternating current power supply end; the rectifying unit 4 is used for receiving the alternating current output by the alternating current power supply end and rectifying the alternating current to output direct current; the rectifying unit can be a three-phase rectifying module or a single-phase rectifying module; the rectification part of the rectification unit can adopt a three-phase bridge type uncontrollable rectifier or a three-phase bridge type PWM rectifier; the alternating current power supply end is a three-phase alternating current power supply end, and specifically can be a power grid or a three-phase alternating current generator;
the output end of the first inversion unit 5 is connected with a power supply line of electric equipment on the tower crane; the input end of the first inversion unit 5 is connected with the output end of the rectification unit through a positive direct current bus and a negative direct current bus. The first inversion unit is used for inverting the direct current to output alternating current to a load, and the first inversion unit can adopt a circuit structure of an IGBT or IPM three-phase bridge inverter which outputs PWM waveforms and the like; it is known in the art to integrate the rectifying unit with the first inverting unit and electrically connect the two together.
Originally, the electric wire netting is at the earth's surface, and the converter is installed above the tower crane, has R, S, T, zero line, five cables of PE line to and the ground wire of converter shell ground connection between the converter that extends to the top from the earth's surface electric wire netting. In the tower crane, only one PE wire is additionally arranged between the positive and negative cables extending from the earth surface power grid to the frequency converter above, and compared with the prior art, two cables are omitted, so that the cost of two long cables is reduced; in addition, originally, the AC cable extends to the position above the tower crane from the ground power grid, the DC cable is connected between the inversion units on the tower crane from the rectification unit on the ground, and the three-phase AC is rectified and converted into DC voltage and then boosted, so that the current passing through the DC cable is smaller under the condition of the same power, and the wire diameter required by the DC cable is smaller.
Furthermore, a first switch 6 for controlling the on-off of the positive and negative direct current buses is arranged on the positive and negative direct current buses, and a second switch 7 for controlling the on-off of the three-phase power input line of the rectifying unit is arranged on the three-phase power input line.
Further, the first switch 6 and the second switch 7 are circuit breakers with thermal release and magnetic release; the first switch 6 and the second switch 7 are electrically connected with a controller, the controller can be a computer, and a user controls the first switch and the second switch through the computer to realize the on-off and open-circuit protection of the positive and negative direct current buses.
Further, the rectifier further comprises a first filtering unit 8, wherein the first filtering unit 8 is arranged between the rectifying unit and the first inverting unit; the smoothing filter is used for smoothing the voltage output by the rectifying unit; the first filter unit 8 is a filter capacitor; a second filtering unit is optionally arranged between the rectifying unit and the alternating current power supply end; for preventing electromagnetic interference; the second filtering unit may be an LC filter composed of a capacitor and an inductor. The first filtering unit and the second filtering unit are combined for use, so that the stability of alternating current can be improved, the load is effectively prevented from being impacted, and the service life of the load is prolonged.
Furthermore, the energy recovery unit is an energy feedback unit connected with a lifting motor; the energy feedback unit is a special energy feedback unit for the frequency converter; when the heavy object falls down, the heavy object drives the rotating shaft of the lifting motor to rotate through the lifting rope, and electric energy generated by the rotation of the rotating shaft of the lifting motor is input into the energy storage unit through the energy feedback unit; energy is saved and braking is facilitated.
Further, the energy recovery unit is a generator, the first power supply mechanism further comprises a rope winding drum 9, the hoisting rope main body is wound on the rope winding drum, and a rotor of the generator is in transmission connection with the rope winding drum or the hoisting rope.
Specifically, the generator may be in transmission with a hoisting rope, the hoisting rope moves to drive the rotor to rotate, or may be in transmission connection with the rope drum 9, when the heavy object falls, the rope drum 9 rotates to drive the rotor to rotate, and the position is not particularly limited; so as to convert the falling potential energy of the heavy object into electric energy and supply the electric energy to electric equipment through a power supply line. In general, a power supply line of an electric device is connected with a mains supply, an energy storage unit is used as a standby energy source, and when power is cut off or power consumption is in a peak period, the energy storage unit is used for providing electric energy for the electric device.
Further, a rotating shaft of the rope winding drum is in transmission connection with a rotor of the generator; the lifting hook is hooked with a weight, and the rotating shaft of the rope winding drum is driven to rotate in the falling process of the weight and drives the rotor of the generator to rotate so as to generate electricity.
Further, the rotating shaft of the rope winding drum is in transmission connection with the rotor of the generator through a speed change gear set 10; the speed change gear group 10 is used for changing low-speed large torque transmitted from a rotating shaft of the rope reel into high-speed small torque through a series of gear combinations, and transmitting the high-speed small torque to a rotor of the generator so as to play a role in transmitting the torque; since the rotation speed of the rotating shaft of the rope reel may not reach the rotation speed required by the generator rotor, the speed is increased by the speed change gear set 10.
Further, a rotating shaft of the rope winding drum is in transmission connection with a rotor of the generator through a ratchet mechanism 11; the ratchet mechanism 11 is used for enabling the rotating shaft of the rope reel to transmit torque to the rotor of the generator only when the heavy object falls down; the ratchet wheel can only rotate towards one direction but can not rotate reversely, when the heavy object falls down, the ratchet wheel is driven to rotate, and the ratchet wheel drives the generator rotor to rotate; when the heavy object is lifted, the rotating shaft of the rope winding drum does not transmit torque to the generator, so that the energy consumption of the lifting motor is reduced.
The speed change gear set comprises a driving gear and a driven gear which are meshed with each other; the number of teeth of the driving gear is greater than that of the driven gear; the driving gear is arranged on a rotating shaft of the rope reel, the driven gear is arranged on a speed change gear transmission shaft 14, and the speed change gear transmission shaft 14 is in transmission connection with a rotor of the generator; specifically, one end of the transmission gear transmission shaft 14 is hollow, the ratchet mechanism is arranged at the hollow end of the transmission gear transmission shaft, and a rotor of the generator is in transmission connection with the ratchet; when the weight on the hook is pulled up, the ratchet wheel does not transmit torque to the rotor, so that the energy consumption of the lifting motor is reduced.
Further, the device also comprises a controller, a first contactor 12 and a second contactor 13;
the first contactor 12 is arranged between commercial power and a power supply circuit of electric equipment on the tower crane and is used for controlling the connection and disconnection between the commercial power and the power supply circuit;
the second contactor 13 is arranged between the energy storage unit and a power supply circuit of electric equipment on the tower crane and is used for controlling the on-off of the energy storage unit and the power supply circuit;
the controller is capable of controlling the opening and closing of the first contactor 12 and the second contactor 13.
In general, a power supply line of an electric device is connected with a mains supply, an energy storage unit is used as a standby energy source, and the energy storage unit is used for supplying power to the electric device when power is cut off or power consumption is in a peak period. The controller can be a computer, a timing module is arranged in the computer, and the controller controls the first contactor and the second contactor to be opened and closed according to the timing module. If the peak period of electricity utilization is from 9 pm to 12 pm on a certain day; when 6 o' clock at night, the computer receives the signal of the timing module to control the first contactor to be disconnected, the second contactor to be closed and the energy storage unit to supply power; after 12 points, the computer receives the signal of the timing module to control the second contactor to be disconnected and the first contactor to be closed; so as to achieve the purposes of staggering peak power utilization, saving energy and reducing emission.
Furthermore, a current transformer is arranged between the generator and the energy storage unit, and a second inversion unit is arranged between the energy storage unit and a power supply circuit of electric equipment on the tower crane; if the generator is a direct current generator, the converter is a DC-DC converter; if an alternator, the converter is an AC-DC converter;
the converter is used for converting the electric energy voltage converted by the generator into an electric energy voltage suitable for being stored by the energy storage unit;
the second inversion unit is used for converting the direct current of the energy storage unit into alternating current used by electric equipment.
The specific working principle of the utility model is as follows;
the tower crane can convert the falling potential energy of a heavy object into electric energy through the generator in the process of putting down the heavy object, and the electric energy is stored in the energy storage unit; on one hand, energy is collected, on the other hand, the falling of the heavy object is more stable (because a part of gravitational potential energy is converted into electric energy), and the paying-off of the hoisting rope is also convenient to control;
the power grid is originally on the ground, the frequency converter is arranged above the tower crane, R, S, T, a zero line, five PE (polyethylene) cables and a ground wire of the shell of the frequency converter are arranged between the frequency converters extending from the power grid on the ground to the upper part; in the tower crane, only one PE wire is additionally arranged between the positive and negative cables extending from the earth surface power grid to the frequency converter above, and compared with the prior art, two cables are omitted, so that the cost of two long cables is reduced; in addition, an alternating current cable originally extends from a ground power grid to a position above a tower crane between frequency converters, a direct current cable is connected between a rectification unit on the ground and an inversion unit on the tower crane, and the three-phase alternating current is rectified and converted into direct current voltage and then is boosted, so that the current passing through the direct current cable is smaller under the condition of the same power, and the wire diameter required by the direct current cable is smaller.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A power supply system based on a tower crane is characterized by comprising a tower crane (1), a first power supply mechanism and a second power supply mechanism;
the first power supply mechanism comprises a lifting motor, a lifting rope, an energy recovery unit and an energy storage unit;
a rotating shaft of the lifting motor is wound and connected with the head end of a lifting rope, the tail end of the lifting rope is provided with a lifting hook (3) for hooking a heavy object, and the energy recovery unit is connected with the lifting motor; in the falling process of the heavy object, the energy recovery unit can convert the lowering potential energy of the heavy object into electric energy; the energy recovery unit is connected with the energy storage unit, and the energy storage unit is connected with a power supply line of electric equipment on the tower crane;
the second power supply mechanism comprises a rectifying unit (4) arranged on the ground surface and a first inverter unit (5) arranged on the tower (1); the input end of the rectifying unit (4) is connected with an alternating current power supply end; the output end of the first inversion unit (5) is connected with a power supply circuit of electric equipment on the tower crane; the input end of the first inversion unit (5) is connected with the output end of the rectification unit (4) through a positive direct current bus and a negative direct current bus.
2. The tower crane-based power supply system according to claim 1, wherein a first switch (6) for controlling the on-off of the positive and negative direct current buses is arranged on the positive and negative direct current buses, and a second switch (7) for controlling the on-off of the three-phase power input line of the rectifying unit (4) is arranged on the three-phase power input line.
3. The tower crane-based power supply system according to claim 1, further comprising a first filtering unit (8), wherein the first filtering unit (8) is disposed between the rectifying unit (4) and the first inverting unit (5).
4. The tower crane-based power supply system according to claim 1, wherein the energy recovery unit is an energy feedback unit connected with a hoisting motor; when the heavy object falls down, the heavy object drives the rotating shaft of the lifting motor to rotate through the lifting rope, and electric energy generated by rotation of the rotating shaft of the lifting motor is input into the energy storage unit through the energy feedback unit.
5. The tower crane-based power supply system according to claim 1, wherein the energy recovery unit is a generator, the first power supply mechanism further comprises a rope reel (9), the rope reel (9) is used for winding a hoisting rope, and a rotor of the generator is in transmission connection with the rope reel or the hoisting rope.
6. The tower crane-based power supply system according to claim 5, wherein a rotating shaft of the rope winding drum (9) is in transmission connection with a rotor of the generator (2); the lifting hook (3) is hooked with a heavy object, and the rotating shaft of the rope winding drum (9) is driven to rotate in the falling process of the heavy object and drives the rotor of the generator (2) to rotate.
7. The tower crane-based power supply system according to claim 5, wherein a rotating shaft of the rope winding drum (9) is in transmission connection with a rotor of the generator (2) through a speed change gear set (10); the speed change gear set (10) is used for changing low-speed large torque transmitted from a rotating shaft of the rope reel (9) into high-speed small torque through a series of gear combinations and transmitting the high-speed small torque to a rotor of the generator (2).
8. The tower crane-based power supply system according to claim 5, wherein a rotating shaft of the rope winding drum (9) is in transmission connection with a rotor of the generator (2) through a ratchet mechanism (11); the ratchet mechanism (11) is used for enabling the rotating shaft of the rope reel (9) to transmit torque to the rotor of the generator (2) only when the heavy object falls down.
9. The tower crane-based power supply system according to claim 1, further comprising a controller, a first contactor (12) and a second contactor (13);
the first contactor (12) is arranged between commercial power and a power supply circuit of electric equipment on the tower crane and is used for controlling the connection and disconnection between the commercial power and the power supply circuit;
the second contactor (13) is arranged between the energy storage unit and a power supply circuit of electric equipment on the tower crane and is used for controlling the on-off of the energy storage unit and the power supply circuit;
the controller can control the opening and closing of the first contactor (12) and the second contactor (13).
10. The tower crane-based power supply system according to claim 5, wherein a converter is arranged between the generator (2) and the energy storage unit, and a second inverter unit is arranged between the energy storage unit and a power supply line of electric equipment on the tower crane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220024221.2U CN216599128U (en) | 2022-01-06 | 2022-01-06 | Power supply system based on tower crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220024221.2U CN216599128U (en) | 2022-01-06 | 2022-01-06 | Power supply system based on tower crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216599128U true CN216599128U (en) | 2022-05-24 |
Family
ID=81633272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220024221.2U Active CN216599128U (en) | 2022-01-06 | 2022-01-06 | Power supply system based on tower crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216599128U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336713A (en) * | 2022-01-06 | 2022-04-12 | 长沙中塔智能科技有限公司 | Power supply system based on tower crane |
-
2022
- 2022-01-06 CN CN202220024221.2U patent/CN216599128U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336713A (en) * | 2022-01-06 | 2022-04-12 | 长沙中塔智能科技有限公司 | Power supply system based on tower crane |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101917020B (en) | Lift energy feedback, reactive compensation and switched-off emergency running method and system | |
| CN101848850A (en) | Automatic rescue operation for a regenerative drive system | |
| CN201737550U (en) | Elevator energy feedback, reactive compensation and outage emergency operation system | |
| CN216599128U (en) | Power supply system based on tower crane | |
| CN216588972U (en) | Electric energy management system based on energy recovery | |
| CN107528383B (en) | Super capacitor UPS power supply device for mine hoist | |
| CN114784830A (en) | Comprehensive physical energy storage system and energy storage method of gravity combined flywheel | |
| CN114336713A (en) | Power supply system based on tower crane | |
| CN114336698A (en) | Electric energy management system based on energy recovery | |
| CN103427729A (en) | Rod pumped well group control system based on direct current bus | |
| CN211089147U (en) | Distributed energy storage elevator control system | |
| CN205544318U (en) | Hoisting machinery matrix energy repayment transmission system | |
| CN216649527U (en) | Remote frequency conversion system | |
| CN202004500U (en) | Auxiliary power supply for crane | |
| CN108358064B (en) | Self-powered tower crane rotating lifting appliance device | |
| CN217264254U (en) | Control system of frequency conversion construction elevator | |
| CN201869080U (en) | Flywheel energy storage motor device with changeable power supply structure | |
| CN204578105U (en) | A kind of energy feedback system based on port crane | |
| CN205500478U (en) | Energy -conserving elevator control gear of scene | |
| CN115694209A (en) | Remote frequency conversion system | |
| CN114597940A (en) | Lithium battery potential energy feedback system of crane | |
| CN203301188U (en) | Energy-saving system of rubber-tyred container gantry crane in position-changing and street-crossing processes | |
| CN105356509A (en) | Lifting machinery matrix type energy feedback transmission system | |
| CN221370280U (en) | New energy crane trolley | |
| CN205604208U (en) | High integrated self -elevating drilling unit driving power system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |