Crane capable of recycling energy

Abstract

The utility model relates to the field of energy recovery of cranes, and discloses a crane capable of recycling energy, which comprises an electric hoist, a main circuit, a control circuit, a frequency converter, a direct current converter, energy storage equipment and an energy management system, the main circuit is connected with a motor of the electric hoist through the frequency converter, the energy management system is connected with the frequency converter and the energy storage device, and the frequency converter, the direct-current converter and the energy storage device are sequentially connected. When a heavy object is lifted, the main circuit supplies power to the motor, the motor rotates forwards to drive the heavy object to lift, otherwise, when the heavy object descends, the motor can be driven to rotate reversely to generate regenerative electric energy, and the regenerative electric energy is stored in the energy storage equipment after being rectified, filtered and the like for subsequent calling. The crane can convert gravitational potential energy generated when a heavy object descends into electric energy through the motor, heating caused by braking can be avoided, the service life of the crane is prolonged, and performance of the crane is improved.

Description

Technical Field

[0001] This utility model relates to the field of crane energy recovery, specifically to a crane that can recover and reuse energy. Background Technology

[0002] With the development of lifting equipment, electric hoists have been widely used as important lifting tools. Their working principle is mainly to drive the transmission mechanism through an electric motor, which drives the drum or sprocket to rotate, thereby realizing the lifting, lowering and moving of heavy objects.

[0003] When lifting heavy objects, the motor rotates forward after being powered on. The torque generated by the motor is transmitted to the drum or sprocket through the transmission mechanism, causing the drum or sprocket to rotate in a specific direction. When lowering heavy objects, the motor reverses direction, and the torque generated by the reverse rotation causes the drum or sprocket to rotate in the opposite direction.

[0004] However, there is a problem of energy waste during the use of electric hoists. For example, during the descent of the electric hoist, the gravitational potential energy of the load is usually converted into heat energy and dissipated through braking resistors and other means. This not only wastes energy, but also causes the equipment to overheat, affecting its lifespan and performance. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a crane that can recycle energy. When lifting heavy objects, the main circuit supplies power to the motor. The motor rotates forward to drive the heavy objects to rise. Conversely, when the heavy objects descend, their own gravitational potential energy is converted into regenerated electrical energy through the motor. After rectification, filtering and other processing, the regenerated electrical energy is stored in the energy storage device for subsequent use.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a crane with recyclable energy, including an electric hoist, a main circuit, a control circuit, a frequency converter, a DC converter, an energy storage device, and an energy management system. The control circuit is connected to the main circuit through a transformer, the main circuit is connected to the motor of the electric hoist through the frequency converter, and the energy management system is connected to the frequency converter and the energy storage device respectively. The frequency converter, the DC converter, and the energy storage device are connected in sequence.

[0007] Under the control circuit and energy management system, the electrical energy of the main circuit drives the motor to rotate forward through the frequency converter to lift the heavy object. When the heavy object descends, it drives the motor to rotate in reverse to generate regenerative electrical energy. The regenerative electrical energy passes through the frequency converter and DC converter in sequence and then enters the energy storage device for storage.

[0008] Optionally, a braking resistor is provided on one side of the motor, and the braking resistor is connected to both the frequency converter and the energy management system.

[0009] Optionally, an energy feedback protector is provided between the DC converter and the energy storage device.

[0010] Optionally, an encoder may also be provided between the motor and the frequency converter.

[0011] Optionally, a power protector is installed on the main circuit, and the output contacts of the power protector are connected to the control circuit.

[0012] Optionally, it also includes an I-shaped track, with the electric hoist and the energy storage device respectively installed on both sides of the I-shaped track. A hook for hooking heavy objects is provided below the I-shaped track, and the upper end of the hook is connected to the electric hoist through a flexible element.

[0013] Optionally, a first mounting plate and a second mounting plate are arranged opposite each other on both sides of the I-shaped track. The lower parts of the two are fixedly connected by a connecting rod, and the inner side of the upper part is rotatably mounted with guide wheels that can cooperate with the I-shaped track; and the energy storage device is connected to the first mounting plate, and the electric hoist is connected to the second mounting plate.

[0014] Optionally, a support plate is fixedly connected to the outer side of the first mounting plate, and the energy storage device is fixedly installed on the support plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) In this utility model, when lifting heavy objects, the main circuit supplies power to the motor. The motor rotates forward to drive the heavy objects to rise. Conversely, when the heavy objects fall, the motor will rotate in reverse to generate regenerative electrical energy. After rectification, filtering and other processing, the regenerative electrical energy is stored in the energy storage device for subsequent use. The crane can convert the gravitational potential energy of the heavy objects when they fall into electrical energy through the motor, which reduces energy waste, avoids heat generation during braking, and extends its service life and performance.

[0017] (2) In this utility model, the energy storage device and the electric hoist are distributed on both sides of the I-shaped track. The energy storage device here can not only store the energy recovered by the electric motor, but also use the weight of the energy storage device to replace the counterweight to ensure that the electric hoist can move stably along the track. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the crane structure in an embodiment of this utility model;

[0019] Figure 2 This is a side view of the crane in an embodiment of the present invention;

[0020] Figure 3This is a schematic diagram of the circuit structure of the crane in this embodiment of the utility model;

[0021] The components include: 1. I-shaped track; 2. First mounting plate; 3. Second mounting plate; 4. Guide wheel; 5. Support plate; 6. Energy storage device; 7. Motor; 8. Hook; 9. Energy management system; 10. Braking resistor; 11. Frequency converter. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0023] like Figure 1 , Figure 2 As shown, a crane capable of recyclable energy includes an I-shaped track 1, an electric hoist, and an energy storage device 6. The electric hoist and the energy storage device 6 are respectively installed on both sides of the I-shaped track 1. A hook 8 for hooking heavy objects is provided below the I-shaped track 1, and the upper end of the hook 8 is connected to the electric hoist through a flexible member.

[0024] The electric hoist and energy storage device 6 can move synchronously along the length of the I-shaped track 1. The flexible component is a chain or wire rope, one end of which is connected to the hook 8, and the other end is wound on the sprocket or drum of the electric hoist. The hook 8 is usually connected to the heavy object. The electric motor 7 of the electric hoist drives the sprocket or drum to rotate, which can realize the lifting and lowering of the heavy object.

[0025] As described above, the electric motor 7 consumes electrical energy to rotate forward, driving the sprocket or drum to rotate forward, and lifting the heavy object through the flexible component and hook 8; when the heavy object descends, its own gravitational potential energy drives the sprocket or drum to rotate in reverse through the hook 8 and flexible component, which in turn drives the electric motor 7 to rotate in reverse to generate regenerative electrical energy, which is finally stored in the energy storage device 6.

[0026] Among them, the energy storage device 6 uses a battery. The energy storage device 6 and the electric hoist are distributed on both sides of the I-shaped track 1. The energy storage device 6 here can not only store the energy recovered by the motor 7, but also use the weight of the energy storage device 6 to replace the counterweight to ensure that the electric hoist can move stably along the track. At the same time, it avoids the problem of adding a battery placement position in the electric hoist when recovering kinetic energy, which greatly reduces the design difficulty.

[0027] Furthermore, a first mounting plate 2 and a second mounting plate 3 are arranged opposite each other on both sides of the I-shaped track 1. The lower parts of the two are fixedly connected by a connecting rod, and the upper inner sides of both are rotatably installed with guide wheels 5 that can cooperate with the I-shaped track 1; and the energy storage device 6 is connected to the first mounting plate 2, and the electric hoist is connected to the second mounting plate 3.

[0028] The two guide wheels 5 are each driven by a corresponding motor, so that the energy storage device 6 and the electric hoist can move along the length of the I-shaped track 1; a fixed pulley is installed on the connecting rod, and one end of the flexible part passes over the fixed pulley from above and is connected to the hook 8.

[0029] To facilitate the installation of the energy storage device 6, a support plate 5 is fixedly connected to the outside of the first mounting plate 2. One end of the support plate 5 is fixedly connected to the first mounting plate 2, and the other end is bent horizontally to support the energy storage device 6. That is, the energy storage device 6 is fixedly installed on the support plate 5.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, a crane capable of recovering and reusing energy also includes a main circuit, a control circuit, a frequency converter 11, a DC / DC converter, a braking resistor 10, and an energy management system 9. The energy management system 9 and the braking resistor 10 are arranged opposite each other on both sides of the energy storage device 6. The control circuit is connected to the main circuit through a transformer. The main circuit is connected to the motor 7 of the electric hoist through the frequency converter 11. The energy management system 9 is connected to both the frequency converter 11 and the energy storage device 6. The frequency converter 11, the DC / DC converter, and the energy storage device 6 are connected in sequence. The braking resistor 10 is connected to both the frequency converter 11 and the energy management system 9.

[0031] Under the control circuit and energy management system 9, the electrical energy of the main circuit drives the motor 7 to rotate forward through the frequency converter 11 to lift the heavy object. When the heavy object descends, it drives the motor 7 to reverse and generate regenerative electrical energy. The regenerative electrical energy passes through the frequency converter 11 and the DC converter in sequence and then enters the energy storage device 6 for storage, so that it can be used later. The crane can convert the gravitational potential energy of the heavy object when it descends into electrical energy through the motor 7 for storage, thereby avoiding heat generation during braking and extending its service life and performance.

[0032] The main circuit includes phases 1L1, 1L2, and 1L3 connected to the power supply, which has a voltage of 380V and a frequency of 50Hz. Phases 1L1, 1L2, and 1L3 are connected to the input terminals R, S, and T of the frequency converter 11, respectively, and the input terminals of the motor 7 are connected to the output terminals U, V, and W of the frequency converter 11, respectively.

[0033] The energy management system 9 is a comprehensive system for monitoring, analyzing, optimizing and controlling the production, transmission, distribution and use of energy; the braking resistor 10 is an important component used by the frequency converter 11 to consume the energy fed back by the motor 7 during the braking process. Its function is to consume the regenerative electrical energy generated by the reverse rotation of the motor 7 in the form of heat energy, thereby maintaining the stability of the DC bus voltage.

[0034] The energy management system 9 can rationally control the recovery and release of energy according to different operating conditions. That is, according to the actual situation, it can control the regenerated electrical energy to be consumed as heat energy through the braking resistor 10, or send the regenerated electrical energy into the energy storage device 6 through the frequency converter 11 and the DC converter in sequence.

[0035] A transformer is installed between the control circuit and the main circuit. The primary coil of the transformer is connected to the main circuit, and the secondary coil is responsible for receiving external electrical energy and converting it into magnetic field energy. The secondary coil is connected to the load and converts the magnetic field energy back into electrical energy to supply the load. The transformer here is used to convert the high voltage on the main circuit into a low voltage to supply power to the load on the control circuit. The control circuit is further divided into a start-stop circuit, an ascending circuit, and a descending circuit, and the ascending circuit and the descending circuit are connected in parallel with the start-stop circuit.

[0036] The start / stop circuit includes a normally closed switch SB1, a normally open switch SB2, a coil KM1, a normally open main contact KM1, and a normally open auxiliary contact KM1. The normally closed switch SB1, the normally open switch SB2, and the coil KM1 are connected in series with the secondary coil. The normally open main contact KM1 is connected in series with the main circuit and is located before the frequency converter 11. The normally open auxiliary contact KM1 is connected in parallel across the two ends of the normally open switch SB2.

[0037] Normally open switch SB2 is the start button. When normally open switch SB2 is pressed, the start / stop circuit is activated, coil KM1 is energized, and the normally open main contact KM1 closes, thus activating the main circuit. At the same time, normally open auxiliary contact KM1 closes, short-circuiting normally open switch SB2, so that the start / stop circuit can continue to conduct even when normally open switch SB2 is open. In addition, a normally open key switch is connected in series in the start / stop circuit to control the crane's start authority and the on / off state of some circuits, increasing the safety of the equipment and the convenience of operation and management. That is, before powering on, the correct key must be inserted to ensure that the start / stop circuit can conduct normally after normally open switch SB2 is pressed.

[0038] Normally closed switch SB1 is an emergency stop button. When normally closed switch SB1 is pressed, the start / stop circuit is disconnected and the main circuit is de-energized to ensure the safety of equipment and personnel.

[0039] The rising circuit includes a normally open switch SB3, a normally closed limit switch SQU1, a normally closed limit switch SQU2, a coil KM2, a normally open main contact KM2, and a normally closed auxiliary contact KM3. Among them, the normally open switch SB3, the normally closed limit switch SQU1, the normally closed limit switch SQU2, the normally closed auxiliary contact KM3, and the coil KM2 are connected in series. The normally open main contact KM2 is connected in series in the main circuit and is located between the normally open main contact KM1 and the frequency converter 11.

[0040] The descent circuit includes a normally open switch SB4, a normally closed limit switch SQD1, a coil KM3, a normally open main contact KM3, and a normally closed auxiliary contact KM2; wherein, the normally open switch SB4, the normally closed limit switch SQD1, the normally closed auxiliary contact KM2, and the coil KM3 are connected in series, and the normally open main contact KM3 is connected in parallel across the normally open main contact KM2.

[0041] Phase 1L1 of the main circuit is connected to the R terminal of the frequency converter 11 through phase 2L1 of the normally open main contact KM3. Phase 1L2 of the main circuit is connected to the T terminal of the frequency converter 11 through phase 2L2 of the normally open main contact KM3. Phase 1L3 of the main circuit is connected to the S terminal of the frequency converter 11 through phase 2L3 of the normally open main contact KM3. This connection method can make the motor 7 reverse.

[0042] Both the lifting circuit and the lowering circuit are connected in parallel across the two ends of the coil KM1. The normally open switch SB3 is the lifting button, and the normally open switch SB4 is the lowering button. With the start-stop circuit on, the forward and reverse rotation of the motor 7 can be controlled by the normally open switches SB3 and SB4, thereby realizing the lifting and lowering of the hook 8.

[0043] After pressing the normally open switch SB3, the lifting circuit is activated, the coil KM2 is energized, and the main circuit is activated after the normally open main contact KM2 closes. The motor 7 rotates forward to lift the heavy object, and at the same time the normally closed auxiliary contact KM2 opens to ensure that the lowering circuit is disconnected during the lifting process. The normally closed limit switches SQU1 and SQU2 are used to control the lifting height to prevent excessive lifting and safety accidents. When the corresponding height is reached, the normally closed limit switches SQU1 and SQU2 open respectively, causing the main circuit to be disconnected and stop working.

[0044] After pressing the normally open switch SB4, the descent circuit is activated, the coil KM3 is energized, and the normally open main contact KM3 closes. After the main circuit is activated, it is connected in reverse with the frequency converter 11. The motor 7 reverses to lower the heavy object. At the same time, the normally closed auxiliary contact KM3 opens to ensure that the ascending circuit is disconnected during the descent. The normally closed limit switch SQD1 is used to control the descent height. After the descent is completed, the normally closed limit switch SQD1 automatically opens, causing the main circuit to disconnect and stop working.

[0045] A DC-DC converter is an electronic device that converts one DC voltage into another. By controlling the switching transistor to turn on and off, the input DC voltage is chopped into a series of pulse voltages. Then, the pulse voltage is filtered and regulated by energy storage components such as inductors and capacitors to obtain the required output DC voltage for storage in the energy storage device 6.

[0046] An energy feedback protector is installed between the DC converter and the energy storage device 6. During the braking process of the motor, a large amount of regenerative electrical energy is generated and fed back to the DC bus of the frequency converter 11. When the DC bus voltage rises to a certain value, the energy feedback protector will automatically feed this portion of regenerative electrical energy, which has been processed by the DC converter, back to the energy storage device 6, instead of consuming it as heat energy as the braking resistor 10.

[0047] An encoder is also installed between the motor 7 and the frequency converter 11. During the operation of the motor 7, the encoder can continuously monitor the position and speed changes of the motor 7, indirectly reflecting the operating status of the motor 7, and converting the rotational motion of the motor 7 into electrical pulse signals. By analyzing the frequency and number of pulse signals, the actual speed of the motor 7 can be calculated. By analyzing the encoder feedback signal, it can be determined whether the motor is operating normally, such as whether there are abnormal conditions such as vibration, overload, or stall.

[0048] A power protector is installed on the main circuit. The power protector is a device used to protect electrical equipment from abnormal power supply. The input contacts of the power protector are connected to phases 1L1, 1L2 and 1L3 of the main circuit, respectively. The output contacts of the power protector are connected to the start / stop circuit, rise circuit and fall circuit in the control circuit.

[0049] Among them, the energy storage device 6, the braking resistor 10, the DC converter, the frequency converter 11, the energy feedback protector, the encoder, the power protector and the energy management system 9 are all existing technologies, so they will not be described in detail here.

[0050] The models and parameters of the above components are as follows:

[0051] The braking resistor 10 is from the Yaskawa-CDBR series, with a power of 100W and a resistance of 500Ω.

[0052] The DC / DC converter uses the Emerson-DPD series, with an input voltage of 24V and an output voltage of 12V.

[0053] The frequency converter 11 adopts the CHINT-NE800 series, with a voltage of 3-phase 380V and a power of 0.4kW-200kW;

[0054] Energy storage device 6 uses an energy storage battery module (LEP) with an input voltage of 48V and a capacity of 100Ah.

[0055] The energy management system 9 adopts the Growatt-SHMS series, supports Modbus / CAN communication protocols, and has a range of 10kW-200kW.

[0056] The energy feedback protector uses the Schneider Electric-RNF series, with an input voltage of 380V and a rated current of 20A-100A.

[0057] The encoder uses the Leadshine-EC100 series, with a resolution of 1000PPR, incremental type, and 5-24V power supply;

[0058] The power protector uses the CHINT-NB1 series, with a response time of less than 20ms, and supports rated current of 10A-63A and voltage of 240V / 400V.

[0059] In summary, this utility model proposes a crane with recyclable energy. When the electric hoist descends, the gravitational potential energy of the load is converted into electrical energy by the motor 7. After rectification and filtering, the electrical energy is stored in the energy storage device 6. The energy storage device 6 can efficiently store and release energy. Furthermore, the energy storage device 6 can not only store the energy recovered by the motor 7, but also use its weight to replace the counterweight, balancing the counterweight and ensuring that the electric hoist can move stably along the track.

[0060] Therefore, this device improves energy recovery efficiency, reduces energy waste, and lowers equipment operating costs. At the same time, by reducing the process of converting energy into heat, it reduces the temperature rise of the equipment and extends its lifespan. In addition, the system has a relatively simple structure and is easy to implement and promote.

[0061] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0063] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A crane capable of recovering and reusing energy, characterized in that: It includes an electric hoist, a main circuit, a control circuit, a frequency converter, a DC-DC converter, an energy storage device, and an energy management system. The control circuit is connected to the main circuit through a transformer. The main circuit is connected to the electric hoist's motor through the frequency converter. The energy management system is connected to the frequency converter and the energy storage device respectively. The frequency converter, DC-DC converter, and energy storage device are connected in sequence. Under the control circuit and energy management system, the electrical energy of the main circuit drives the motor to rotate forward through the frequency converter to lift the heavy object. When the heavy object descends, it drives the motor to rotate in reverse to generate regenerative electrical energy. The regenerative electrical energy passes through the frequency converter and DC converter in sequence and then enters the energy storage device for storage.

2. The crane with recyclable energy as described in claim 1, characterized in that: A braking resistor is provided on one side of the motor, and the braking resistor is connected to both the frequency converter and the energy management system.

3. The crane with recyclable energy as described in claim 2, characterized in that: An energy feedback protector is provided between the DC converter and the energy storage device.

4. The crane with recyclable energy as described in claim 3, characterized in that: An encoder is also provided between the motor and the frequency converter.

5. The crane with recyclable energy as described in claim 4, characterized in that: A power protector is installed on the main circuit, and the output contacts of the power protector are connected to the control circuit.

6. The crane with recyclable energy as described in claim 1, characterized in that: It also includes an I-shaped track, with the electric hoist and the energy storage device respectively installed on both sides of the I-shaped track. A hook for hooking heavy objects is provided below the I-shaped track, and the upper end of the hook is connected to the electric hoist through a flexible component.

7. The crane with recyclable energy as described in claim 6, characterized in that: The two sides of the I-shaped track are provided with a first mounting plate and a second mounting plate, which are fixedly connected at the bottom by a connecting rod. The upper inner side of each plate is rotatably mounted with a guide wheel that can cooperate with the I-shaped track. The energy storage device is connected to the first mounting plate, and the electric hoist is connected to the second mounting plate.

8. The crane with recyclable energy as described in claim 7, characterized in that: A support plate is fixedly connected to the outer side of the first mounting plate, and the energy storage device is fixedly installed on the support plate.

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