Tower crane combined power supply method and tower crane combined power supply system

Abstract

The invention relates to the field of engineering machinery, and discloses a tower crane combined power supply method and a tower crane combined power supply system.The tower crane combined power supply method comprises the steps that when it is determined that a tower crane is in a low-power operation state, a diesel generator set is controlled to supply power to the tower crane and an electric energy storage device; when it is determined that the tower crane is in the high-power operation state, the diesel generator set and the electric energy storage device are controlled to jointly supply power to the tower crane. According to the combined power supply method for the tower crane, the requirement for the type of the diesel generating set is reduced, the diesel generating set can adopt a low-power type, and the energy storage function of the electric energy storage device is utilized, so that the fuel oil utilization rate of the diesel generating set can be remarkably improved, resource waste is avoided, and the operation cost of the tower crane is also reduced.

Description

Technical Field

[0001] The present invention belongs to the field of engineering machinery, and in particular, relates to a tower crane joint power supply method and a tower crane joint power supply system. Background Art

[0002] At present, when there is no suitable mains electricity in the working environment, tower cranes are usually powered by diesel generator sets. Since the power required for tower cranes to lift loads is relatively large, diesel generator sets must be high-power models. However, in actual applications, the power required for tower cranes to operate at no load is relatively small and lasts for a long time, that is, tower cranes operate under low load and low power demand conditions most of the time. As a result, the fuel utilization rate of diesel generator sets is low, resulting in waste of resources and high tower crane operating costs. Summary of the invention

[0003] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a tower crane joint power supply method and a tower crane joint power supply system, aiming to solve the technical problems that the fuel utilization rate of diesel generator sets in existing tower cranes is low, resulting in waste of resources and high tower crane operating costs.

[0004] To achieve the above object, the present invention provides a tower crane joint power supply method, the tower crane joint power supply method comprising:

[0005] When it is determined that the tower crane is in a low-power operation state, controlling the diesel generator set to supply power to the tower crane and the electric energy storage device respectively;

[0006] When it is determined that the tower crane is in a high-power operating state, the diesel generator set and the electric energy storage device are controlled to jointly supply power to the tower crane.

[0007] Optionally, the tower crane joint power supply method further includes:

[0008] When the power consumption of the tower crane is greater than a preset power value, the lifting weight percentage of the tower crane is greater than a preset percentage, or the sum of the lifting gear value and the amplitude change gear value of the tower crane is greater than a preset value, it is determined that the tower crane is in a high-power operation state;

[0009] When the power consumption of the tower crane is less than or equal to a preset power value, the lifting weight percentage of the tower crane is less than or equal to a preset percentage, and the sum of the lifting gear value and the amplitude change gear value of the tower crane is less than or equal to a preset value, it is determined that the tower crane is in a low-power operation state.

[0010] Optionally, when it is determined that the tower crane is in a low-power operation state, controlling the diesel generator set to supply power to the tower crane and the electric energy storage device respectively includes:

[0011] When it is determined that the tower crane is in a low-power operation state, controlling the electric energy storage device to enter a state without discharge demand;

[0012] After the electric energy storage device enters a state without discharge demand, when it is determined that the electric energy storage device is in a charging mode, the diesel generator set is controlled to supply power to the electric energy storage device.

[0013] Optionally, when determining that the tower crane is in a low-power operation state, controlling the diesel generator set to supply power to the tower crane and the electric energy storage device respectively further comprises:

[0014] After the electric energy storage device enters a state without discharge demand, when it is determined that the electric energy storage device is in a discharge mode and lasts for a preset time, the electric energy storage device is controlled to switch to a charging mode and then the diesel generator set is controlled to supply power to the electric energy storage device.

[0015] Optionally, the tower crane joint power supply method further includes:

[0016] When the electric energy storage device supplies power to the tower crane and it is determined that the remaining power of the electric energy storage device is less than a first preset power and greater than or equal to a second preset power, the alarm device is controlled to send out a first low power alarm signal.

[0017] Optionally, the tower crane joint power supply method further includes:

[0018] When the electric energy storage device is supplying power to the tower crane and it is determined that the remaining power of the electric energy storage device is less than the second preset power, the operation of the tower crane is restricted and the alarm device is controlled to send a second low power alarm signal.

[0019] The present invention also provides a tower crane combined power supply system, the tower crane combined power supply system comprising:

[0020] Diesel generator set, electrically connected to the tower crane;

[0021] An electric energy storage device, electrically connected to the diesel generator set and the tower crane respectively;

[0022] The control unit is respectively connected to the diesel generator set, the electric energy storage device and the tower crane in communication, and is configured as follows:

[0023] When it is determined that the tower crane is in a low-power operation state, controlling the diesel generator set to supply power to the tower crane and the electric energy storage device respectively;

[0024] When it is determined that the tower crane is in a high-power operating state, the diesel generator set and the electric energy storage device are controlled to jointly supply power to the tower crane.

[0025] Optionally, the control unit is further configured to:

[0026] When the power consumption of the tower crane is greater than a preset power value, the lifting weight percentage of the tower crane is greater than a preset percentage, or the sum of the lifting gear value and the amplitude change gear value of the tower crane is greater than a preset value, it is determined that the tower crane is in a high-power operation state;

[0027] When the power consumption of the tower crane is less than or equal to a preset power value, the lifting weight percentage of the tower crane is less than or equal to a preset percentage, and the sum of the lifting gear value and the amplitude change gear value of the tower crane is less than or equal to a preset value, it is determined that the tower crane is in a low-power operation state.

[0028] Optionally, the control unit is further configured to:

[0029] When it is determined that the tower crane is in a low-power operation state, controlling the electric energy storage device to enter a state without discharge demand;

[0030] After the electric energy storage device enters a state without discharge demand, when it is determined that the electric energy storage device is in a charging mode, the diesel generator set is controlled to supply power to the electric energy storage device.

[0031] Optionally, the control unit is further configured to:

[0032] After the electric energy storage device enters a state without discharge demand, when it is determined that the electric energy storage device is in a discharge mode and lasts for a preset time, the electric energy storage device is controlled to switch to a charging mode and then the diesel generator set is controlled to supply power to the electric energy storage device.

[0033] Optionally, the tower crane combined power supply system further includes an alarm device, and the control unit is communicatively connected to the alarm device and is further configured as follows:

[0034] When the electric energy storage device supplies power to the tower crane and it is determined that the remaining power of the electric energy storage device is less than a first preset power and greater than or equal to a second preset power, the alarm device is controlled to send a first low power alarm signal.

[0035] Optionally, the control unit is further configured to:

[0036] When the electric energy storage device is supplying power to the tower crane and it is determined that the remaining power of the electric energy storage device is less than the second preset power, the operation of the tower crane is restricted and the alarm device is controlled to send a second low power alarm signal.

[0037] Through the above technical scheme, when the tower crane is in a low-power operating state, the diesel generator set is controlled to supply power to the tower crane and the electric energy storage device. In this way, part of the electric energy generated by the diesel generator set is used to supply power for the operation of the tower crane, and part of the electric energy can be stored in the electric energy storage device. When the tower crane is in a high-power operating state, the diesel generator set and the electric energy storage device are controlled to supply power to the tower crane together. In this way, compared with the method in the prior art where the diesel generator set alone supplies power to the tower crane, the model requirements of the diesel generator set are reduced, and the diesel generator set can select a small-power model. In addition, by utilizing the energy storage function of the electric energy storage device, the fuel utilization rate of the diesel generator set can be significantly improved, resource waste can be avoided, and the operating cost of the tower crane can be reduced.

[0038] Other features and advantages of the present invention will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention.

[0040] In the attached picture:

[0041] Figure 1 A block diagram of a tower crane combined power supply system in one embodiment of the present invention;

[0042] Figure 2 The process of the tower crane joint power supply method in one embodiment of the present invention is as follows Figure 1 ;

[0043] Figure 3 The process of the tower crane joint power supply method in one embodiment of the present invention is as follows Figure 2 ;

[0044] Figure 4 The process of the tower crane joint power supply method in one embodiment of the present invention is as follows Figure 3 .

[0045] Description of reference numerals:

[0046] 1 Tower Crane

[0047] 2 Diesel Generator Sets

[0048] 3. Electrical energy storage device

[0049] 4 Grid-connected cabinet DETAILED DESCRIPTION

[0050] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0052] In the present invention, unless otherwise specified, the directions or positional relationships indicated by directional words such as "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0053] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0054] The present invention firstly provides a tower crane joint power supply method.

[0055] In one embodiment, referring to the attached Figure 2 As shown, the tower crane joint power supply method includes:

[0056] When it is determined that the tower crane 1 is in a low-power operation state, the diesel generator set 2 is controlled to supply power to the tower crane 1 and the electric energy storage device 3 respectively;

[0057] When it is determined that the tower crane 1 is in a high-power operation state, the diesel generator set 2 and the electric energy storage device 3 are controlled to jointly supply power to the tower crane 1 .

[0058] In this embodiment, when the tower crane 1 is in a low-power operating state, the diesel generator set 2 is controlled to supply power to the tower crane 1 and the electric energy storage device 3. In this way, part of the electric energy generated by the diesel generator set 2 is used to supply power to the operation of the tower crane 1, and part of the electric energy can be stored in the electric energy storage device 3. When the tower crane 1 is in a high-power operating state, the diesel generator set 2 and the electric energy storage device 3 are controlled to supply power to the tower crane 1 together. In this way, in addition to the diesel generator set 2 supplying power to the tower crane 1, the electric energy stored in the electric energy storage device can also be supplied to the tower crane 1 at the same time. In this way, compared with the method in the prior art where the diesel generator set 2 supplies power to the tower crane 1 alone, the model requirements of the diesel generator set are reduced, and the diesel generator set 2 can select a small-power model. In addition, by utilizing the energy storage function of the electric energy storage device, the fuel utilization rate of the diesel generator set 2 can be significantly improved, resource waste can be avoided, and the operating cost of the tower crane 1 can be reduced.

[0059] It can be understood that when the tower crane 1 is in a low-power operating state, the energy storage device 3 is in a charging mode to receive and store the electric energy supplied by the diesel generator set 2; when the tower crane 1 is in a high-power operating state, the energy storage device 3 is in a discharging mode to supply electric energy to the tower crane 1.

[0060] In one embodiment, referring to the attached Figure 2 As shown, the tower crane joint power supply method also includes:

[0061] When the power consumption of the tower crane 1 is greater than a preset power value, the lifting weight percentage of the tower crane 1 is greater than a preset percentage, or the sum of the lifting gear value and the amplitude change gear value of the tower crane 1 is greater than a preset value, it is determined that the tower crane 1 is in a high-power operation state;

[0062] When the power consumption of tower crane 1 is less than or equal to the preset power value, the lifting weight percentage of tower crane 1 is less than or equal to the preset percentage, and the sum of the lifting gear value and the amplitude change gear value of tower crane 1 is less than or equal to the preset value, it is determined that tower crane 1 is in a low-power operation state.

[0063] It can be understood that when the power consumption of the tower crane 1 is greater than the preset power value, the lifting weight percentage of the tower crane 1 is greater than the preset percentage, or the sum of the lifting gear value and the amplitude change gear value of the tower crane 1 is greater than the preset value, it indicates that the tower crane 1 is in a heavy-loaded operating state. At this time, the power consumption of the tower crane 1 is relatively large. The diesel generator set 2 and the electric energy storage device 3 jointly supply power to the tower crane 1, which can ensure that the tower crane 1 can operate stably and reliably. When the power consumption of the tower crane 1 is less than or equal to the preset power value, the lifting weight percentage of the tower crane 1 is less than or equal to the preset percentage, and the sum of the lifting gear value and the amplitude change gear value of the tower crane 1 is less than or equal to the preset value, it indicates that the tower crane 1 is in an unloaded or light-loaded operating state. At this time, the power consumption of the tower crane 1 is relatively small. The diesel generator set 2 supplies power to the tower crane 1 and the electric energy storage device 3. When the power consumption demand of the normal operation of the tower crane 1 is met, the excess electric energy generated by the diesel generator set 2 can be stored in the electric energy storage device 3.

[0064] In one embodiment, referring to the attached Figure 3 As shown, when it is determined that the tower crane 1 is in a low-power operation state, controlling the diesel generator set 2 to supply power to the tower crane 1 and the electric energy storage device 3 respectively includes:

[0065] When it is determined that the tower crane 1 is in a low-power operation state, the electric energy storage device 3 is controlled to enter a state without discharge demand;

[0066] After the electric energy storage device 3 enters a state without discharge demand, when it is determined that the electric energy storage device 3 is in a charging mode, the diesel generator set 2 is controlled to supply power to the electric energy storage device 3 .

[0067] It can be understood that the electric energy storage device 3 enters a state of no discharge demand, which means that at this time, the diesel generator set 2 alone supplies power to the tower crane 1 to maintain the light load or no-load operation of the tower crane 1.

[0068] In one embodiment, referring to the attached Figure 3 As shown, when it is determined that the tower crane 1 is in a low-power operation state, controlling the diesel generator set 2 to supply power to the tower crane 1 and the electric energy storage device 3 respectively also includes:

[0069] After the electric energy storage device 3 enters a state without discharge demand, when it is determined that the electric energy storage device 3 is in the discharge mode and lasts for a preset time, the electric energy storage device 3 is controlled to switch to the charging mode and then the diesel generator set 2 is controlled to supply power to the electric energy storage device 3.

[0070] In this embodiment, when the tower crane 1 switches from a high-power operating state to a low-power operating state, the electric energy storage device 3 will continue to supply power for a certain period of time. This arrangement effectively provides the reliability of stable operation of the tower crane 1 and avoids the situation where a sudden reduction in power supply affects the operation of the tower crane 1.

[0071] In one embodiment, referring to the attached Figure 4 As shown, the tower crane joint power supply method also includes:

[0072] When the power storage device 3 supplies power to the tower crane 1, and the remaining power of the power storage device 3 is determined to be less than the first preset power and greater than or equal to the second preset power, the alarm device is controlled to send a first low power alarm signal. It can be understood that the second preset power is less than the first preset power.

[0073] In actual application, when the alarm device sends out the first low-power alarm signal, it reminds the user of the power status of the energy storage device 3. For example, the first preset power is 20% of the total power, and the second preset power is 10% of the total power. When the alarm device sends out the first low-power alarm signal, the user can know that the remaining power is between 20% and 10% of the total power.

[0074] In one embodiment, referring to the attached Figure 4 As shown, the tower crane joint power supply method also includes:

[0075] When the energy storage device 3 supplies power to the tower crane 1 and the remaining power of the energy storage device 3 is determined to be less than the second preset power, the operation of the tower crane 1 is restricted and the alarm device is controlled to send a second low power alarm signal.

[0076] In actual application, when the alarm device sends out the second low-battery alarm signal, it reminds the user that the power status of the energy storage device 3 and the operation of the tower crane 1 are restricted. For example, the second preset power is 10% of the total power, and the tower crane 1 is limited to single-mechanism operation. When the alarm device sends out the second low-battery alarm signal, the user can be informed that the remaining power is less than 10% of the total power and the tower crane 1 can only be operated by a single mechanism. Among them, the tower crane 1 is limited to only a single mechanism operation, even if the tower crane 1 can only operate one of multiple working mechanisms, for example, the tower crane 1 is limited to the lifting mechanism to perform lifting operations, the tower crane 1 is limited to the luffing mechanism to perform luffing operations, or the tower crane 1 is limited to the slewing mechanism to perform slewing operations, and so on.

[0077] In actual application, the alarm device may be an alarm module or include a first alarm module and a second alarm module. When the alarm device includes the first alarm module and the second alarm module, the first alarm module is used to determine that the remaining power of the electric energy storage device 3 is less than the first preset power and greater than or equal to the second preset power and send out a first low power alarm signal, and the second alarm module is used to determine that the remaining power of the electric energy storage device 3 is less than the second preset power and send out a second low power alarm signal; specifically, the alarm device may be an audible and visual alarm, that is, the first low power alarm signal and the second low power alarm signal are audible and visual signals. In addition, in order to enable the user to know the power status more quickly and accurately, the second low power alarm signal can be greatly distinguished from the first low power alarm signal, for example, the volume of the first low power alarm signal is relatively low and is green light, and the volume of the second low power alarm signal is relatively high and is red light.

[0078] The invention also provides a tower crane combined power supply system.

[0079] In one embodiment, referring to the attached Figure 1 As shown in the figure, the tower crane combined power supply system includes:

[0080] A diesel generator set 2 is electrically connected to the tower crane 1;

[0081] The electric energy storage device 3 is electrically connected to the diesel generator set 2 and the tower crane 1 respectively;

[0082] The control unit is respectively connected to the diesel generator set 2, the electric energy storage device 3 and the tower crane 1 in communication, and is configured as follows:

[0083] When it is determined that the tower crane 1 is in a low-power operation state, the diesel generator set 2 is controlled to supply power to the tower crane 1 and the electric energy storage device 3 respectively;

[0084] When it is determined that the tower crane 1 is in a high-power operation state, the diesel generator set 2 and the electric energy storage device 3 are controlled to jointly supply power to the tower crane 1 .

[0085] Specifically, the tower crane combined power supply system may further include a grid-connected cabinet 4 , through which the diesel generator set 2 and the electric energy storage device 3 may be connected to the grid, and the output end of the grid-connected cabinet 4 is connected to the power supply interface of the tower crane 1 .

[0086] Specifically, the electric energy storage device 3 may be a battery energy storage cabinet.

[0087] In one embodiment, the control unit is further configured to:

[0088] When the power consumption of the tower crane 1 is greater than a preset power value, the lifting weight percentage of the tower crane 1 is greater than a preset percentage, or the sum of the lifting gear value and the amplitude change gear value of the tower crane 1 is greater than a preset value, it is determined that the tower crane 1 is in a high-power operation state;

[0089] When the power consumption of tower crane 1 is less than or equal to the preset power value, the lifting weight percentage of tower crane 1 is less than or equal to the preset percentage, and the sum of the lifting gear value and the amplitude change gear value of tower crane 1 is less than or equal to the preset value, it is determined that tower crane 1 is in a low-power operation state.

[0090] In one embodiment, the control unit is further configured to:

[0091] When it is determined that the tower crane 1 is in a low-power operation state, the electric energy storage device 3 is controlled to enter a state without discharge demand;

[0092] After the electric energy storage device 3 enters a state without discharge demand, when it is determined that the electric energy storage device 3 is in a charging mode, the diesel generator set 2 is controlled to supply power to the electric energy storage device 3 .

[0093] In one embodiment, the control unit is further configured to:

[0094] After the electric energy storage device 3 enters a state without discharge demand, when it is determined that the electric energy storage device 3 is in the discharge mode and lasts for a preset time, the electric energy storage device 3 is controlled to switch to the charging mode and then the diesel generator set 2 is controlled to supply power to the electric energy storage device 3.

[0095] In one embodiment, the tower crane joint power supply system further includes an alarm device, and the control unit is communicatively connected with the alarm device and is further configured as follows:

[0096] When the energy storage device 3 supplies power to the tower crane 1 and the remaining power of the energy storage device 3 is determined to be less than the first preset power and greater than or equal to the second preset power, the alarm device is controlled to send out a first low power alarm signal.

[0097] In one embodiment, the control unit is further configured to:

[0098] When the energy storage device 3 supplies power to the tower crane 1 and the remaining power of the energy storage device 3 is determined to be less than the second preset power, the operation of the tower crane 1 is restricted and the alarm device is controlled to send a second low power alarm signal.

[0099] Specifically, the alarm device may be an audible and visual alarm.

[0100] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0103] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A tower crane joint power supply method, characterized in that: The tower crane joint power supply method comprises: When it is determined that the tower crane (1) is in a low-power operating state, the diesel generator set (2) is controlled to supply power to the tower crane (1) and the electric energy storage device (3) respectively; When it is determined that the tower crane (1) is in a high-power operating state, the diesel generator set (2) and the electric energy storage device (3) are controlled to jointly supply power to the tower crane (1).

2. The tower crane joint power supply method according to claim 1, characterized in that: The tower crane joint power supply method also includes: When the power consumption of the tower crane (1) is greater than a preset power value, the lifting weight percentage of the tower crane (1) is greater than a preset percentage, or the sum of the lifting gear value and the amplitude change gear value of the tower crane (1) is greater than a preset value, it is determined that the tower crane (1) is in a high-power operation state; When the power consumption of the tower crane (1) is less than or equal to a preset power value, the lifting weight percentage of the tower crane (1) is less than or equal to a preset percentage, and the sum of the lifting gear value and the amplitude change gear value of the tower crane (1) is less than or equal to a preset value, it is determined that the tower crane (1) is in a low-power operation state.

3. The tower crane joint power supply method according to claim 1, characterized in that: When it is determined that the tower crane (1) is in a low-power operation state, controlling the diesel generator set (2) to supply power to the tower crane (1) and the electric energy storage device (3) respectively comprises: When it is determined that the tower crane (1) is in a low-power operating state, the electric energy storage device (3) is controlled to enter a state without discharge demand; After the electric energy storage device (3) enters a state without discharge demand, when it is determined that the electric energy storage device (3) is in a charging mode, the diesel generator set (2) is controlled to supply power to the electric energy storage device (3).

4. The tower crane joint power supply method according to claim 3 is characterized in that: When it is determined that the tower crane (1) is in a low-power operation state, controlling the diesel generator set (2) to supply power to the tower crane (1) and the electric energy storage device (3) respectively further comprises: After the electric energy storage device (3) enters a state without discharge demand, when it is determined that the electric energy storage device (3) is in a discharge mode and continues for a preset time, the electric energy storage device (3) is controlled to switch to a charging mode and then the diesel generator set (2) is controlled to supply power to the electric energy storage device (3).

5. The tower crane joint power supply method according to claim 1, characterized in that: The tower crane joint power supply method also includes: When the electric energy storage device (3) supplies power to the tower crane (1), and it is determined that the remaining power of the electric energy storage device (3) is less than a first preset power and greater than or equal to a second preset power, the alarm device is controlled to issue a first low power alarm signal.

6. The tower crane joint power supply method according to claim 5, characterized in that: The tower crane joint power supply method also includes: When it is determined that the remaining power of the electric energy storage device (3) is less than the second preset power during the process of the electric energy storage device (3) supplying power to the tower crane (1), the operation of the tower crane (1) is restricted and the alarm device is controlled to send out a second low power alarm signal.

7. A tower crane joint power supply system, characterized in that: The tower crane combined power supply system comprises: A diesel generator set (2) is electrically connected to the tower crane (1); An electric energy storage device (3) is electrically connected to the diesel generator set (2) and the tower crane (1) respectively; The control unit is respectively connected to the diesel generator set (2), the electric energy storage device (3) and the tower crane (1) for communication, and is configured as follows: When it is determined that the tower crane (1) is in a low-power operating state, the diesel generator set (2) is controlled to supply power to the tower crane (1) and the electric energy storage device (3) respectively; When it is determined that the tower crane (1) is in a high-power operating state, the diesel generator set (2) and the electric energy storage device (3) are controlled to jointly supply power to the tower crane (1).

8. The tower crane combined power supply system according to claim 7, characterized in that: The control unit is further configured to: When the power consumption of the tower crane (1) is greater than a preset power value, the lifting weight percentage of the tower crane (1) is greater than a preset percentage, or the sum of the lifting gear value and the amplitude change gear value of the tower crane (1) is greater than a preset value, it is determined that the tower crane (1) is in a high-power operation state; When the power consumption of the tower crane (1) is less than or equal to a preset power value, the lifting weight percentage of the tower crane (1) is less than or equal to a preset percentage, and the sum of the lifting gear value and the amplitude change gear value of the tower crane (1) is less than or equal to a preset value, it is determined that the tower crane (1) is in a low-power operation state.

9. The tower crane combined power supply system according to claim 7, characterized in that: The control unit is further configured to: When it is determined that the tower crane (1) is in a low-power operating state, the electric energy storage device (3) is controlled to enter a state without discharge demand; After the electric energy storage device (3) enters a state without discharge demand, when it is determined that the electric energy storage device (3) is in a charging mode, the diesel generator set (2) is controlled to supply power to the electric energy storage device (3).

10. The tower crane combined power supply system according to claim 9, characterized in that: The control unit is further configured to: After the electric energy storage device (3) enters a state without discharge demand, when it is determined that the electric energy storage device (3) is in a discharge mode and continues for a preset time, the electric energy storage device (3) is controlled to switch to a charging mode and then the diesel generator set (2) is controlled to supply power to the electric energy storage device (3).

11. The tower crane combined power supply system according to claim 7, characterized in that: The tower crane joint power supply system further includes an alarm device, and the control unit is communicatively connected with the alarm device and is further configured as follows: When, during the process of the electric energy storage device (3) supplying power to the tower crane (1), it is determined that the remaining power of the electric energy storage device (3) is less than a first preset power and greater than or equal to a second preset power, the alarm device is controlled to emit a first low power alarm signal.

12. The tower crane combined power supply system according to claim 11, characterized in that: The control unit is further configured to: When it is determined that the remaining power of the electric energy storage device (3) is less than the second preset power during the process of the electric energy storage device (3) supplying power to the tower crane (1), the operation of the tower crane (1) is restricted and the alarm device is controlled to send out a second low power alarm signal.

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