Tower crane power grid system and tower crane

Abstract

The utility model belongs to the technical field of building machinery and provides a tower crane power grid system and a tower crane, the tower crane power grid system comprises an external power supply access module, a photovoltaic power generation module and an energy storage module, the photovoltaic power generation module is used for solar power generation, and the energy storage module is electrically connected with the external power supply access module and the photovoltaic power generation module respectively. And the energy storage module is used for storing electric energy of the external power supply access module and the photovoltaic power generation module, and is also used for supplying power to electric equipment of the tower crane. Power is supplied to the electric equipment of the tower crane preferentially through the energy storage module, normal operation of the electric equipment of the tower crane can be guaranteed for a period of time when a construction site is suddenly powered off, so that the probability that the whole machine is impacted due to sudden power-off braking of the equipment is reduced, and meanwhile photovoltaic energy near the tower crane can be recycled by arranging the photovoltaic power generation module.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of construction machinery, and particularly relates to a tower crane power grid system and a tower crane. BACKGROUND

[0002] With the increasing height of urban housing construction in China, the demand for tower cranes is also increasing. The existing tower crane generally directly supplies power to the tower crane electrical equipment through the external power grid of the construction site. However, due to the overload of power supply, power failure sometimes inevitably occurs at the construction site. At this time, if the tower crane is in operation, sudden power failure will cause the tower crane to stop urgently, resulting in a very large impact on the entire machine. SUMMARY

[0003] In view of the above defects or deficiencies, the utility model provides a tower crane power grid system and a tower crane, aiming to solve the technical problem that the existing tower crane cannot be urgently operated due to sudden power failure.

[0004] To achieve the above purpose, the utility model provides a tower crane power grid system, which comprises an external power source access module, a photovoltaic power generation module and an energy storage module. The photovoltaic power generation module is used for solar power generation. The energy storage module is electrically connected with the external power source access module and the photovoltaic power generation module respectively. The energy storage module is used for storing the electric energy of the external power source access module and the photovoltaic power generation module. The energy storage module is also used for supplying power to the tower crane electrical equipment.

[0005] In the embodiment of the utility model, the energy storage module comprises an energy storage unit body and a first inverter unit. The energy storage unit body is electrically connected with the external power source access module and the tower crane electrical equipment respectively. The energy storage unit body is also connected with the photovoltaic power generation module through the first inverter unit. The first inverter unit is used for rectifying the electric energy generated by the photovoltaic power generation module solar power generation into alternating current and providing it to the energy storage unit body.

[0006] In the embodiment of the utility model, the tower crane electrical equipment comprises an execution driving mechanism. The energy storage module further comprises a second inverter unit. The energy storage unit body is connected with the execution driving mechanism through the second inverter unit. The second inverter unit is used for rectifying the electric energy generated by the energy recovery of the execution driving mechanism into alternating current and providing it to the energy storage unit body.

[0007] In the embodiment of the utility model, the execution driving mechanism comprises a common DC bus, a driving motor and a frequency converter. The driving motor is connected with the common DC bus through the frequency converter. The frequency converter is used for rectifying the alternating current generated by the energy recovery of the driving motor into direct current and supplying it to the common DC bus. The common DC bus is electrically connected with the energy storage unit body through the second inverter unit.

[0008] In the embodiment of the utility model, the number of driving motor and frequency converter is multiple respectively, the number of driving motor and frequency converter is one to one correspondence, multiple driving motor is in parallel and is arranged on the common DC bus.

[0009] In the embodiment of the utility model, the external power access module is further electrically connected with the common DC bus, and a switch and an AC-DC conversion module are arranged between the external power access module and the common DC bus.

[0010] In the embodiment of the utility model, the tower crane electrical equipment comprises an electric control unit, and the electric control unit is electrically connected with the energy storage module and the external power access module.

[0011] In the embodiment of the utility model, the tower crane electrical equipment further comprises a lighting device, and the lighting device is electrically connected with the energy storage unit body and is in control connection with the electric control unit.

[0012] In the embodiment of the utility model, the tower crane electrical equipment further comprises a socket power supply, and the socket power supply is electrically connected with the energy storage unit body and is in control connection with the electric control unit.

[0013] To achieve the above object, the utility model also provides a tower crane, wherein the tower crane comprises the tower crane power grid system according to the above.

[0014] Through the above technical scheme, the tower crane power grid system provided by the utility model embodiment has the following beneficial effects:

[0015] Through the energy storage module, the tower crane electrical equipment is preferentially powered, so that the tower crane electrical equipment can normally operate for a period of time when the power supply is suddenly interrupted at the construction site, thereby reducing the probability that the whole machine is impacted due to the sudden power failure of the equipment. At the same time, through the setting of the photovoltaic power generation module, the photovoltaic energy near the tower crane can be recycled.

[0016] Other features and advantages of the utility model will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings are used to provide the understanding of the utility model, and constitute a part of the specification, and are used together with the following specific embodiment to explain the utility model, but do not constitute the limitation to the utility model. In the drawings:

[0018] Figure 1 It is the connection schematic diagram of the tower crane power grid system according to the embodiment of the utility model;

[0019] Figure 2 It is the connection schematic diagram of the common DC bus of the execution driving mechanism according to the embodiment of the utility model.

[0020] EXPLANATION OF REFERENCE NUMERALS

[0021] 1, external power access module; 2, photovoltaic power generation module; 3, energy storage module; 31, energy storage unit body; 32, first inverter unit; 33, second inverter unit; 4, execution driving mechanism; 41, common DC bus; 42, frequency converter; 5, electric control unit; 61, lighting device; 62, socket power supply. DETAILED DESCRIPTION

[0022] The specific embodiments of the utility model are described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0023] The tower crane power grid system of the utility model is described below with reference to the drawings.

[0024] The existing tower crane is generally directly powered by an external power grid. When the external power grid suddenly loses power, if the tower crane is in operation, the tower crane will stop suddenly, causing the entire machine to be subjected to a very large impact.

[0025] To ensure the safe and stable operation of the tower crane, the utility model provides a tower crane power grid system, as shown in Figure 1 The tower crane power grid system includes an external power access module 1 and an energy storage module 3. The external power access module 1 is used to connect with the external power grid. The energy storage module 3 is electrically connected with the external power access module 1 and is used to store the electric energy flowing from the external power access module 1. The energy storage module 3 is also used to supply power to the tower crane electrical equipment.

[0026] When the tower crane power grid system is running, the external power grid will first charge the energy storage module 3. When the energy storage module 3 has sufficient power storage and the tower crane needs to run, the energy storage module 3 will preferentially supply power to the tower crane electrical equipment. By preferentially supplying power to the tower crane electrical equipment through the energy storage module 3, the normal operation of each tower crane electrical equipment can be ensured for a period of time when the construction site suddenly loses power, thereby reducing the probability of the entire machine being impacted due to the sudden power failure of the equipment.

[0027] The top of the tower crane is well-illuminated and has a long sunshine time, which is very suitable for photovoltaic power generation. To realize the recovery of photovoltaic energy near the tower crane, the tower crane power grid system of the utility model also has a photovoltaic power generation module 2, as shown in Figure 1 The photovoltaic power generation module 2 is electrically connected with the energy storage module 3 and can generate solar power. By setting the photovoltaic power generation module 2, not only can the photovoltaic energy near the tower crane be recovered, but also when the external power grid is in a power-off state for a long time and the energy storage module 3 runs out of power, the photovoltaic power generation module 2 can charge the energy storage module 3, thereby ensuring the normal operation of certain emergency functions of the tower crane under certain circumstances.

[0028] The energy storage module 3 is generally an AC input and DC storage charging mode. The electricity generated by the photovoltaic power generation module 2 is generally DC, and DC cannot directly charge the energy storage module 3. In order to store the electricity generated by the photovoltaic power generation module 2, Figure 1 As shown, the energy storage module 3 must include at least an energy storage unit body 31 and a first inverter unit 32. The energy storage unit body 31 is used to store and release electrical energy. The energy storage unit body 31 can be electrically connected to the external power access module 1 and the tower crane's electrical equipment. The energy storage unit body 31 also needs to be connected to the photovoltaic power generation module through the first inverter unit 32. The first inverter unit 32 can convert the direct current generated by the photovoltaic power generation module 2 into alternating current of preset specifications to charge the energy storage unit body 31.

[0029] like Figure 1 As shown, in an embodiment of the present utility model, the electrical equipment of the tower crane includes an executive drive mechanism 4, which is used to drive the tower crane to perform rotation, luffing, lifting and other actions. The energy storage module 3 also includes a second inverter unit 33. The energy storage unit body 31 is connected to the executive drive mechanism 4 through the second inverter unit 33. The second inverter unit 33 is used to rectify the electric energy generated by the energy recovery of the executive drive mechanism 4 into alternating current and provide it to the energy storage unit body 31.

[0030] When the actuator drive mechanism 4 drives the tower crane to perform actions such as lifting, slewing, and luffing and requires braking, or when driving the tower crane to lift a heavy object downward, the braking unit of the actuator drive mechanism 4 will recover energy. The frequency and voltage of the electricity generated by energy recovery will vary depending on the operating speed of the actuator drive mechanism 4. If the electricity generated by energy recovery is directly transmitted to the energy storage unit body 31, it is likely to damage the energy storage unit body 31. Therefore, a second inverter unit 33 is required to convert the electrical energy generated by energy recovery into AC power that can charge the energy storage unit body 31.

[0031] like Figure 1 and Figure 2As shown, in an embodiment of the present invention, the execution drive mechanism 4 can be powered by variable frequency drive technology. Variable frequency drive technology refers to converting the input current into direct current first, and then converting the direct current into alternating current whose frequency and voltage match the current working conditions of the execution drive mechanism 4, so as to drive the execution drive mechanism 4 to work. To this end, the execution drive mechanism 4 needs to include at least a common DC bus 41, a drive motor and a frequency converter 42. Among them, the drive motor is connected to the common DC bus 41 through the frequency converter 42. The frequency converter 42 is used to convert the DC power of the common DC bus 41 into alternating current with controllable frequency and voltage when the drive motor is outputting power, and to rectify the alternating current generated by the drive motor into DC power and supply it to the common DC bus 41 when the drive motor recovers energy. The DC power on the common DC bus 41 is converted into alternating current by the second inverter unit 33 and supplied to the energy storage unit body 31.

[0032] It can be understood that the inverter 42 is mainly used to realize the conversion between AC and DC, and when DC is converted into AC, it can change the frequency, voltage, etc. of the AC. Through the frequency conversion of the inverter 42, the frequency and voltage of the current output from the common DC bus 41 to the drive motor can be changed, thereby changing the speed and torque of the drive motor, so that the speed and torque of the drive motor match the current working conditions.

[0033] When the drive motor is braking, it becomes a generator. The AC power generated by the drive motor is converted by the inverter 42 and transmitted to the common DC bus 41 in the form of DC power. The current of the common DC bus 41 is inverted by the second inverter unit 33 and converted into AC power of preset specifications to charge the energy storage unit body 31.

[0034] like Figure 2 As shown, in an embodiment of the present invention, there are multiple drive motors and multiple frequency converters 42, and the number of drive motors and frequency converters 42 corresponds one to one. The multiple drive motors can respectively include a hoisting motor for driving the tower crane to lift, a slewing motor for driving the tower crane to rotate, and a luffing motor for driving the tower crane to change its amplitude. The multiple drive motors are arranged in parallel on a common DC bus 41. By arranging the multiple drive motors in parallel, when a certain drive motor recovers energy, the electrical energy generated by the energy recovery can be incorporated into the common DC bus 41 to power other drive motors that need output.

[0035] In an embodiment of the present invention, the external power supply module 1 is also electrically connected to the common DC bus 41, and a switch and an AC / DC conversion module are provided between the external power supply module 1 and the common DC bus 41. The tower crane power grid system of the present invention can also directly supply power to the actuator 4 via the external power grid.

[0036] like Figure 1As shown, in an embodiment of the present invention, the tower crane's electrical equipment includes an electronic control unit 5, a lighting device 61, and a power socket 62. The electronic control unit 5 is electrically connected to the energy storage module 3 and the external power access module 1, respectively. The lighting device 61 and the power socket 62 are electrically connected to the energy storage unit body 31 and are controllably connected to the electronic control unit 5. The electronic control unit 5 is used to control the operation of the inverter 42, the switching of the lighting device 61 and the power socket 62, and the charging and discharging of the energy storage module 3. By supplying power to the electronic control unit 5 through the energy storage module 3, sudden power outages at the construction site can be avoided, preventing the tower crane's control functions from failing.

[0037] The tower crane power grid system of the present invention is described below in conjunction with the control process of the electronic control unit 5 .

[0038] like Figure 1 As shown, the tower crane power grid system of the present invention has three charging modes, namely photovoltaic power generation charging, energy recovery charging of the execution drive mechanism 4, and direct charging from the external power grid. When the energy storage module 3 has sufficient power, the electronic control unit 5 can control the tower crane electrical equipment to be powered by the energy storage module 3, and control the charging mode of the energy storage module 3 to open only the two driving modes of photovoltaic power generation charging and energy recovery charging of the execution drive mechanism 4. When the power consumption of the energy storage module 3 reaches a certain preset value (such as 10%), the electronic control unit 5 can control the energy storage module 3 to stop supplying power, and the external power grid will supply power to the tower crane electrical equipment, while controlling the photovoltaic power generation module 2, the external power grid, and the execution drive mechanism 4 to recover energy and charge the energy storage module 3 together. If the construction site loses power, the external power grid cannot charge the energy storage module 3, and the power consumption of the energy storage module 3 reaches a certain preset value, the execution drive mechanism 4 will be controlled to slow down and issue a warning. When the energy storage module 3's charge is further depleted (e.g., below 2%), the actuator 4 is controlled to shut down, and the energy storage module 3 only supplies power to the lighting and sockets to meet temporary power needs. When the energy storage module 3 supplies power to the tower crane's electrical equipment and the energy storage module 3's charge remains at 100%, the excess power generated by the photovoltaic power generation module 2 and the actuator 4 is fed back to the external power grid.

[0039] Through the above operations, the impact of sudden power outages on the entire machine can be reduced, and the rational distribution and utilization of energy can be achieved, saving electricity costs to the greatest extent.

[0040] In an embodiment of the present invention, a remote control module can also be provided to control the output power of the energy storage module 3 according to the power required by the tower crane. At the same time, the remote control module can also be configured to plan the charging and discharging time periods of the energy storage module 3 according to the usage patterns of the tower crane to achieve maximum working efficiency.

[0041] To achieve the above object, the utility model also provides a tower crane, wherein, the tower crane includes the tower crane electric network system according to above described. Because the tower crane adopts all technical solutions of above described embodiment, therefore at least has the beneficial effect brought by above described embodiment, here no longer repeats.

[0042] In the description of the utility model, it is understood that the terms "first", "second" are only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0043] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0044] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the characteristics of different embodiments or examples without contradiction.

[0045] Although the embodiments of the utility model have been described above, it can be understood that the above described embodiments are exemplary, and can not be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and modify the above described embodiments within the scope of the utility model.

Claims

1. A tower electrical grid system, characterized in that, The tower crane power grid system comprises: an external power access module (1); a photovoltaic power generation module (2) for solar power generation; and an energy storage module (3) electrically connected with the external power access module (1) and the photovoltaic power generation module (2) respectively, the energy storage module (3) being configured to store electric energy of the external power access module (1) and the photovoltaic power generation module (2), and the energy storage module (3) being further configured to supply power to a tower crane electrical equipment. The energy storage module (3) is of a charging mode of AC input and DC storage.

2. The tower crane electrical grid system of claim 1, wherein, The energy storage module (3) comprises an energy storage unit body (31) and a first inverter unit (32), the energy storage unit body (31) being electrically connected with the external power access module (1) and the tower crane electrical equipment respectively, and the energy storage unit body (31) being further connected with the photovoltaic power generation module through the first inverter unit (32), the first inverter unit (32) being configured to rectify AC power generated by the photovoltaic power generation module for solar power generation and supply the AC power to the energy storage unit body (31).

3. The tower crane electrical network system of claim 2, wherein, The tower crane electrical equipment comprises an execution driving mechanism (4), and the energy storage module (3) further comprises a second inverter unit (33), the energy storage unit body (31) being connected with the execution driving mechanism (4) through the second inverter unit (33), and the second inverter unit (33) being configured to rectify AC power generated by energy recovery of the execution driving mechanism (4) and supply the AC power to the energy storage unit body (31).

4. The tower crane electrical grid system of claim 3, wherein, The execution driving mechanism (4) comprises a common DC bus (41), a driving motor and a frequency converter (42), the driving motor being connected with the common DC bus (41) through the frequency converter (42), the frequency converter (42) being configured to rectify AC power generated by energy recovery of the driving motor into DC power and supply the DC power to the common DC bus (41), and the common DC bus (41) being electrically connected with the energy storage unit body (31) through the second inverter unit (33).

5. The tower crane electrical grid system of claim 4, wherein, The number of the driving motors and the number of the frequency converters (42) are respectively multiple, the number of the driving motors and the number of the frequency converters (42) corresponding to each other, and the multiple driving motors are connected in parallel on the common DC bus (41).

6. The tower crane electrical grid system of claim 4, wherein, The external power access module (1) is further electrically connected with the common DC bus (41), and a switch and an AC / DC conversion module are arranged between the external power access module (1) and the common DC bus (41).

7. The tower crane electrical network system of any of claims 1 to 6, wherein, The tower crane electrical equipment further comprises an electric control unit (5) electrically connected with the energy storage module (3) and the external power access module (1) respectively.

8. The tower crane electrical grid system of claim 7, wherein, The tower crane electrical equipment further comprises a lighting device (61) electrically connected with the energy storage module (3) and control-connected with the electric control unit (5).

9. The tower crane electrical grid system of claim 7, wherein, The tower crane electrical equipment further comprises a socket power supply (62) electrically connected with the energy storage module (3) and control-connected with the electric control unit (5).

10. A tower crane, characterized in that The tower crane electrical equipment further comprises a socket power supply (62) electrically connected with the energy storage module (3) and control-connected with the electric control unit (5). The tower crane power grid system according to any one of claims 1 to 9.

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