Crane gate threshold indicating device and crane

Abstract

The utility model discloses a kind of crane boarding gate door limiting indicating device and crane.The device includes power supply module and alarm module;Alarm module is connected with power supply module and boarding gate door limiting normally closed switch respectively, boarding gate door limiting normally closed switch connects boarding gate door, and the first end of connecting power supply module, boarding gate door limiting normally closed switch is used to close when boarding gate door is not completely closed, and, used to disconnect when boarding gate door is completely closed.The utility model can improve the security of personnel entering and exiting crane boarding gate.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a crane boarding gate limit indicator device and a crane. Background Technology

[0002] When personnel are boarding or alighting from the crane, they must use the boarding gate. However, the existing crane boarding gate limit switches only function to prevent power outages. They cannot effectively alert operators and surrounding personnel in a timely manner if the boarding gate is not properly closed or is accidentally opened, posing a significant safety hazard to the crane and seriously endangering the safety of surrounding personnel and equipment. Utility Model Content

[0003] This utility model provides a crane boarding gate limit indicator device and a crane to improve the safety of personnel entering and exiting the crane boarding gate.

[0004] According to one aspect of the present invention, a crane boarding gate limit indicator device is provided, comprising: a power supply module and an alarm module;

[0005] The alarm module is connected to the power supply module and the boarding gate limit normally closed switch respectively. The boarding gate limit normally closed switch is connected to the boarding gate and to the first end of the power supply module. The boarding gate limit normally closed switch is used to close when the boarding gate is not fully closed, and to open when the boarding gate is fully closed.

[0006] Optionally, the alarm module includes a first buzzer and a first indicator light, wherein the first buzzer and the first indicator light are connected in series between the boarding gate limit switch and the second terminal of the power supply module.

[0007] Optionally, the power supply module includes a transformer;

[0008] The first input terminal of the transformer is connected to the first power supply line, the second input terminal of the transformer is connected to the second power supply line, the first output terminal of the transformer is connected to the first terminal of the power supply module, and the second output terminal of the transformer is connected to the second terminal of the power supply module.

[0009] Optionally, it also includes a first switching module and a first protection module; the transformer includes a first coil and a second coil;

[0010] The first end of the first coil is connected to the first end of the first protection module, the second end of the first coil is connected to the second end of the first protection module, the third end of the first protection module is connected to the first end of the first switch module, the fourth end of the first protection module is connected to the second end of the first switch module, the third end of the first switch module is connected to the first power line, and the fourth end of the first switch module is connected to the second power line.

[0011] The first switch module includes a first switch and a second switch; the first protection module includes a first fuse and a second fuse.

[0012] The first end of the first switch is connected to the first power line, the second end of the first switch is connected to the first end of the first fuse, and the second end of the first fuse is connected to the first end of the first coil; the first end of the second switch is connected to the second power line, the second end of the second switch is connected to the first end of the second fuse, and the second end of the second fuse is connected to the second end of the first coil.

[0013] The first end of the second coil is connected to the first output terminal of the transformer, and the second end of the second coil is connected to the second output terminal of the transformer.

[0014] Optionally, both the first switch and the second switch are knife switches, and the first switch and the second switch are linked for control.

[0015] Optionally, it also includes a second protection module, which includes a third fuse;

[0016] The first end of the third fuse is connected to the first end of the second coil, and the second end of the third fuse is connected to the boarding gate limit switch.

[0017] According to another aspect of the present invention, a crane is provided, including the crane boarding gate limit indicator device provided in any embodiment of the present invention.

[0018] Optionally, the power supply module includes a transformer, a first input terminal of the transformer connected to a first power line, a second input terminal of the transformer connected to a second power line, a first output terminal of the transformer connected to a first terminal of the power supply module, a second output terminal of the transformer connected to a second terminal of the power supply module, a third output terminal of the transformer connected to a third terminal of the power supply module, and a fourth output terminal of the transformer connected to a second terminal of the power supply module.

[0019] The transformer includes a first coil, a second coil, and a third coil;

[0020] The first end of the first coil is connected to the first input terminal of the transformer, the second end of the first coil is connected to the second input terminal of the transformer, the first end of the second coil is connected to the first output terminal of the transformer, the second end of the second coil is connected to the second output terminal of the transformer, the first end of the third coil is connected to the third output terminal of the transformer, and the second end of the third coil is connected to the second output terminal of the transformer.

[0021] Optionally, the crane further includes at least one first power supply interface, at least one second power supply interface, a first indicating module, a second indicating module, a third indicating module, and a third protection module;

[0022] The first indicator module, the second indicator module, and the at least one first power supply interface are all connected between the first output terminal and the second output terminal of the transformer. The third indicator module and the at least one second power supply interface are all connected between the third output terminal and the second output terminal of the transformer. The third protection module is connected between the third output terminal of the transformer and the third indicator module.

[0023] Optionally, the first indicator module includes a third switch and a second buzzer, the first end of the third switch is connected to the first end of the power supply module, the first end of the third switch is connected to the first end of the second buzzer, and the second end of the second buzzer is connected to the second end of the power supply module.

[0024] The second indicator module includes a fourth switch and a second indicator light. The first end of the fourth switch is connected to the first end of the power supply module, the second end of the fourth switch is connected to the first end of the second indicator light, and the second end of the second indicator light is connected to the second end of the power supply module.

[0025] The third indicator module includes a fifth switch and at least one third indicator light. The first end of the fifth switch is connected to the third end of the power supply module, and the at least one third indicator light is connected in parallel between the second end of the fifth switch and the second end of the power supply module.

[0026] The third protection module includes a fourth fuse, the first end of which is connected to the third output terminal of the transformer, and the second end of which is connected to the first terminal of the fifth switch.

[0027] The technical solution of this utility model embodiment includes a crane loading gate limit indicator device comprising a power supply module and an alarm module. The alarm module and a normally closed limit switch are connected in series across the two ends of the power supply module. This means that the on / off state of the normally closed limit switch directly affects whether the alarm module is energized and triggers an alarm. For example, when the normally closed limit switch is on, the alarm module is energized and sounds an alarm; when the normally closed limit switch is off, the alarm module loses power and stops sounding an alarm. Thus, operators can determine the current state of the normally closed limit switch based on the status of the alarm module, thereby knowing whether the loading gate is fully closed. This prevents personnel from entering or exiting the loading gate if it is not properly closed or is accidentally opened, thereby improving the safety of personnel entering and exiting the crane loading gate and the safety of personnel and equipment around the crane. Furthermore, the crane loading gate limit indicator device provided by this utility model essentially reuses the normally closed limit switch, simplifying circuit design and making it easy to implement.

[0028] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the structure of a crane boarding gate limit indicator provided in this embodiment of the present utility model;

[0031] Figure 2 A schematic diagram of another crane boarding gate limit indicator provided in this embodiment of the present utility model;

[0032] Figure 3 A schematic diagram of another crane boarding gate limit indicator provided in this embodiment of the present utility model;

[0033] Figure 4 A schematic diagram of another crane boarding gate limit indicator provided in this embodiment of the present utility model;

[0034] Figure 5 A schematic diagram of the structure of a crane provided for an embodiment of this utility model;

[0035] Figure 6 This is a schematic diagram of another crane provided as an embodiment of the present utility model. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and their variations, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] Figure 1 A schematic diagram of a crane boarding gate limit indicator provided in this embodiment of the present invention is shown below. Figure 1 The crane boarding gate limit indicator includes a power supply module 10 and an alarm module 20.

[0039] The alarm module 20 is connected to the power supply module 10 and the boarding gate limit switch SQ. The boarding gate limit switch SQ is connected to the boarding gate (not shown in the figure) and to the first terminal of the power supply module 10. The boarding gate limit switch SQ is used to close when the boarding gate is not fully closed and to open when the boarding gate is fully closed. It is understood that the alarm module 20 can be installed close to the boarding gate for easy observation of its status when personnel enter or exit the boarding gate.

[0040] Specifically, by connecting the normally closed limit switch SQ of the boarding gate and the alarm module 20 in series across the two ends of the power supply module 10, when the normally closed limit switch SQ is closed, the alarm module 20 is energized and sounds an alarm to indicate that the crane boarding gate is not fully closed, thus preventing personnel from entering or exiting the boarding gate. When the normally closed limit switch SQ is open, the alarm module 20 loses power and stops sounding an alarm to indicate that the crane boarding gate is fully closed, at which point personnel can enter and exit the boarding gate normally.

[0041] The technical solution of this utility model embodiment includes a crane access gate limit indicator device comprising a power supply module 10 and an alarm module 20. The alarm module 20 and a normally closed limit switch SQ are connected in series across the power supply module 10. The on / off state of the normally closed limit switch SQ directly affects whether the alarm module 20 is energized and triggers an alarm. For example, when the normally closed limit switch SQ is on, the alarm module 20 is energized and triggers an alarm; when the normally closed limit switch SQ is off, the alarm module 20 loses power and stops triggering an alarm. Thus, operators can determine the current state of the normally closed limit switch SQ based on the state of the alarm module 20, thereby determining whether the access gate is fully closed. This prevents personnel from entering or exiting the access gate if it is not properly closed or is accidentally opened, thereby improving the safety of personnel entering and exiting the crane access gate and enhancing the safety of personnel and equipment around the crane. Meanwhile, the crane boarding gate limit indicator device provided by this utility model is equivalent to reusing the normally closed boarding gate limit switch SQ, which simplifies the circuit design and makes it easy to implement.

[0042] Figure 2 A schematic diagram of another crane boarding gate limit indicator provided in this embodiment of the present invention is shown below. Figure 2 Based on the above embodiments, the alarm module 20 includes a first buzzer FMQ1 and a first indicator light EL1. The first buzzer FMQ1 and the first indicator light EL1 are connected in series between the boarding gate limit normally closed switch SQ and the second terminal of the power supply module 10.

[0043] Optionally, the first indicator light EL1 may include an alarm light.

[0044] Specifically, when the normally closed limit switch SQ of the boarding gate is closed, both the first buzzer FMQ1 and the first indicator light EL1 are energized. As a result, the first buzzer FMQ1 emits an alarm sound, and the first indicator light EL1 lights up. This dual audible and visual alarm serves as a reminder to the crane operator and surrounding personnel that the crane's boarding gate is not closed and that entry or exit through the boarding gate is prohibited. This ensures personnel safety and also alerts relevant personnel to take timely measures to prevent accidents from occurring.

[0045] Figure 3 A schematic diagram of another crane boarding gate limit indicator provided in this embodiment of the present invention is shown below. Figure 3 Based on the above embodiments, the power supply module 10 includes a transformer 11.

[0046] The transformer 11 has its first input terminal connected to the first power line L1, its second input terminal connected to the second power line L2, its first output terminal connected to the first terminal of the power supply module 10, and its second output terminal connected to the second terminal of the power supply module 10.

[0047] Transformer 11 utilizes the principle of electromagnetic induction to change voltage and current, and typically includes step-up transformers and step-down transformers. The first power line L1 and the second power line L2 are used to supply power to transformer 11.

[0048] Continue to refer to Figure 3 Optionally, the crane boarding gate limit indicator also includes a first switch module 30 and a first protection module 40; the transformer 11 includes a first coil X1 and a second coil X2.

[0049] Wherein, the first end of the first coil X1 is connected to the first end of the first protection module 40, the second end of the first coil X1 is connected to the second end of the first protection module 40, the third end of the first protection module 40 is connected to the first end of the first switch module 30, the fourth end of the first protection module 40 is connected to the second end of the first switch module 30, the third end of the first switch module 30 is connected to the first power line L1, and the fourth end of the first switch module 30 is connected to the second power line L2.

[0050] The first coil X1 serves as the primary coil of the transformer 11, used to input electrical energy through the first power line L1 and the second power line L2. The second coil X2 serves as the primary coil of the transformer 11, used to output a first voltage. The first protection module 40 is used for current protection. For example, the input voltage of the first coil X1 can be 380V AC voltage, and the first voltage output by the second coil X2 can be 36V AC voltage.

[0051] Continue to refer to Figure 3 Optionally, the crane boarding gate limit indicator device also includes a second protection module 50, which is connected between the first end of the second coil X2 and the boarding gate limit normally closed switch SQ. The second protection module 50 is used for current protection.

[0052] Figure 4 A schematic diagram of another crane boarding gate limit indicator provided in this embodiment of the present invention is shown below. Figure 4Based on the above embodiments, optionally, the first switch module 30 includes a first switch S1 and a second switch S2; the first protection module 40 includes a first fuse FU1 and a second fuse FU2.

[0053] The first terminal of the first switch S1 is connected to the first power line L1, and the second terminal of the first switch S1 is connected to the first terminal of the first fuse FU1. The second terminal of the first fuse FU1 is connected to the first terminal of the first coil X1. The first terminal of the second switch S2 is connected to the second power line L2, and the second terminal of the second switch S2 is connected to the first terminal of the second fuse FU2. The second terminal of the second fuse FU2 is connected to the second terminal of the first coil X1. The first terminal of the second coil X2 is connected to the first output terminal of the transformer 11, and the second terminal of the second coil X2 is connected to the second output terminal of the transformer 11. For example, the first terminal of the second coil X2 is connected to the normally closed door limit switch SQ, and the second terminal of the second coil X2 is connected to the first indicator light EL1 and grounded. The second coil X2 is used to power the normally closed door limit switch SQ, the first buzzer FMQ1, and the first indicator light EL1.

[0054] Both the first switch S1 and the second switch S2 are knife switches, which have a simple structure. The first switch S1 and the second switch S2 are linked for control; for example, both the first switch S1 and the second switch S2 are activated by the control signal SA, thus simplifying the control logic.

[0055] Optionally, the second protection module 50 includes a third fuse FU3. The first end of the third fuse FU3 is connected to the first end of the second coil X2, and the second end of the third fuse FU3 is connected to the boarding gate limit normally closed switch SQ.

[0056] Among them, the fuses (first fuse FU1, second fuse FU2, and third fuse FU3) are used for current protection, which can protect the circuit when an overload or short circuit fault occurs. For example, when the current in the circuit exceeds the rated current of the fuse, the fuse will automatically melt and disconnect the circuit, thereby protecting the safety of electrical equipment and personnel.

[0057] This utility model embodiment also provides a crane, including the crane boarding gate limit indicator device provided in any of the above embodiments. Therefore, the crane has corresponding beneficial effects.

[0058] Figure 5 This is a schematic diagram of the structure of a crane provided in an embodiment of the present utility model, with reference to... Figure 5The power supply module 10 includes a transformer 11. The first input terminal of the transformer 11 is connected to the first power line L1, the second input terminal of the transformer 11 is connected to the second power line L2, the first output terminal of the transformer 11 is connected to the first terminal of the power supply module 10, the second output terminal of the transformer 11 is connected to the second terminal of the power supply module 10, the third output terminal of the transformer 11 is connected to the third terminal of the power supply module 10, the fourth output terminal of the transformer 11 is connected to the second terminal of the power supply module 10, and the second terminal of the power supply module 10 is grounded.

[0059] The transformer 11 includes a first coil X1, a second coil X2, and a third coil X3. The first end of the first coil X1 is connected to the first input terminal of the transformer 11, and the second end of the first coil X1 is connected to the second input terminal of the transformer 11. The first end of the second coil X2 is connected to the first output terminal of the transformer 11, and the second end of the second coil X2 is connected to the second output terminal of the transformer 11. The first end of the third coil X3 is connected to the third output terminal of the transformer 11, and the second end of the third coil X3 is connected to the second output terminal of the transformer 11.

[0060] The third coil X3 can serve as the secondary coil of transformer 11, used to output a second voltage. It is understood that the first voltage and the second voltage can be different. For example, the input voltage of the first coil X1 can be 380V AC, the first voltage output by the second coil X2 can be 36V AC, and the second voltage output by the third coil X3 can be 220V AC.

[0061] Continue to refer to Figure 5 Optionally, the crane also includes at least one first power supply interface 60, at least one second power supply interface 70, a first indicator module 80, a second indicator module 90, a third indicator module 100, and a third protection module 101. Figure 4 The example shows a crane including two first power supply interfaces 60, which are connected in parallel.

[0062] The first indicator module 80, the second indicator module 90, and at least one first power supply interface 60 are all connected between the first output terminal and the second output terminal of the transformer 11, that is, between the first terminal and the second terminal of the second coil X2.

[0063] The third indicator module 100 and at least one second power supply interface 70 are both connected between the third output terminal and the second output terminal of the transformer 11, that is, between the first terminal and the second terminal of the third coil X3.

[0064] The third protection module 101 is connected between the third output terminal of the transformer 11 and the third indicator module 100 for current protection.

[0065] The first power supply interface 60 and the second power supply interface 70 may both include a socket for supplying power to external devices.

[0066] Figure 6 This is a schematic diagram of another crane provided in an embodiment of the present utility model, with reference to... Figure 6 Based on the above embodiments, the first indicator module 80 includes a third switch S3 and a second buzzer FMQ2. The first end of the third switch S3 is connected to the first end of the power supply module 10, the first end of the third switch S3 is connected to the first end of the second buzzer FMQ2, and the second end of the second buzzer FMQ2 is connected to the second end of the power supply module 10.

[0067] The second indicator module 90 includes a fourth switch S4 and a second indicator light EL2. The first end of the fourth switch S4 is connected to the first end of the power supply module 10, and the second end of the fourth switch S4 is connected to the first end of the second indicator light EL2. The second end of the second indicator light EL2 is connected to the second end of the power supply module 10.

[0068] The third indicator module 100 includes a fifth switch S5 and at least one third indicator light EL3. The first end of the fifth switch S5 is connected to the third end of the power supply module 10, and the at least one third indicator light EL3 is connected in parallel between the second end of the fifth switch S5 and the second end of the power supply module 10. Figure 5 An example is given of a third indicator module 100 including three third indicator lights EL3.

[0069] The third protection module 101 includes a fourth fuse FU4. The first end of the fourth fuse FU4 is connected to the third output end of the transformer 11, and the second end of the fourth fuse FU4 is connected to the first end of the fifth switch S5.

[0070] Specifically, the third switch S3, the fourth switch S4, and the fifth switch S5 can all be push-button switches. When the third switch S3 is pressed, the second buzzer FMQ2 is used for audible indication. When the fourth switch S4 is pressed, the second indicator light EL2 is used for signal indication. When the fifth switch S5 is pressed, the third indicator light EL3 is used for illumination.

[0071] In summary, the crane lighting circuit provided by this utility model embodiment includes a 220V power supply and a 36V power supply. By connecting the normally closed limit switch SQ of the boarding gate to the first buzzer FMQ1 and the first indicator light EL1 in series within the 36V power supply circuit of the crane lighting circuit, and then connecting them in parallel to the 36V power supply circuit, when the boarding gate is not closed or not fully closed, not only will the equipment control power be cut off, but the first indicator light EL1 will illuminate, and the first buzzer FMQ1 will also emit an alarm sound. This dual audible and visual alarm can immediately alert the crane operator and surrounding personnel that the boarding gate is not closed, enabling timely action to be taken to prevent accidents. Furthermore, it can prevent situations where, during crane operation, unauthorized personnel board or alight from the crane. If the limit switch malfunctions and fails to cut off the crane control power in time, the crane operator's continued operation could lead to falls or crush injuries to those boarding the crane. Furthermore, this invention avoids the problem of sudden, unexpected displacement of the door limit switch due to vibration during crane operation, resulting in a falsely closed door and a sudden cutoff of the crane's control power. This could lead to the operator failing to immediately detect and restore power, posing a significant safety hazard and seriously endangering the safety of surrounding personnel and equipment. In summary, this utility model embodiment effectively reuses the normally closed switch SQ and transformer 11 of the crane's boarding gate limit switch, eliminating the need for additional power supply circuits and simplifying circuit design.

[0072] It is understood that the present invention is illustrated by setting the boarding gate limit normally closed switch SQ, the first buzzer FMQ1 and the first indicator light EL1 to be powered by a 36V power supply. In other embodiments, the boarding gate limit normally closed switch SQ, the first buzzer FMQ1 and the first indicator light EL1 may also be powered by a 220V power supply.

[0073] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A crane boarding gate limit indicator device, characterized in that, include: Power supply module and alarm module; The alarm module is connected to the power supply module and the boarding gate limit normally closed switch respectively. The boarding gate limit normally closed switch is connected to the boarding gate and to the first end of the power supply module. The boarding gate limit normally closed switch is used to close when the boarding gate is not fully closed, and to open when the boarding gate is fully closed.

2. The crane boarding gate limit indicator device according to claim 1, characterized in that, The alarm module includes a first buzzer and a first indicator light, which are connected in series between the boarding gate limit switch and the second terminal of the power supply module.

3. The crane boarding gate limit indicator device according to claim 1, characterized in that, The power supply module includes a transformer; The first input terminal of the transformer is connected to the first power supply line, the second input terminal of the transformer is connected to the second power supply line, the first output terminal of the transformer is connected to the first terminal of the power supply module, and the second output terminal of the transformer is connected to the second terminal of the power supply module.

4. The crane boarding gate limit indicator device according to claim 3, characterized in that, It also includes a first switching module and a first protection module; the transformer includes a first coil and a second coil; The first end of the first coil is connected to the first end of the first protection module, the second end of the first coil is connected to the second end of the first protection module, the third end of the first protection module is connected to the first end of the first switch module, the fourth end of the first protection module is connected to the second end of the first switch module, the third end of the first switch module is connected to the first power line, and the fourth end of the first switch module is connected to the second power line. The first switch module includes a first switch and a second switch; the first protection module includes a first fuse and a second fuse. The first end of the first switch is connected to the first power line, the second end of the first switch is connected to the first end of the first fuse, and the second end of the first fuse is connected to the first end of the first coil; the first end of the second switch is connected to the second power line, the second end of the second switch is connected to the first end of the second fuse, and the second end of the second fuse is connected to the second end of the first coil. The first end of the second coil is connected to the first output terminal of the transformer, and the second end of the second coil is connected to the second output terminal of the transformer.

5. The crane boarding gate limit indicator device according to claim 4, characterized in that, Both the first switch and the second switch are knife switches, and the first switch and the second switch are linked for control.

6. The crane boarding gate limit indicator device according to claim 4, characterized in that, It also includes a second protection module, which includes a third fuse; The first end of the third fuse is connected to the first end of the second coil, and the second end of the third fuse is connected to the boarding gate limit switch.

7. A crane, characterized in that, Includes the crane boarding gate limit indicator as described in any one of claims 1-6.

8. The crane according to claim 7, characterized in that, The power supply module includes a transformer. The first input terminal of the transformer is connected to a first power line, the second input terminal of the transformer is connected to a second power line, the first output terminal of the transformer is connected to a first terminal of the power supply module, the second output terminal of the transformer is connected to a second terminal of the power supply module, the third output terminal of the transformer is connected to a third terminal of the power supply module, and the fourth output terminal of the transformer is connected to a second terminal of the power supply module. The transformer includes a first coil, a second coil, and a third coil; The first end of the first coil is connected to the first input terminal of the transformer, the second end of the first coil is connected to the second input terminal of the transformer, the first end of the second coil is connected to the first output terminal of the transformer, the second end of the second coil is connected to the second output terminal of the transformer, the first end of the third coil is connected to the third output terminal of the transformer, and the second end of the third coil is connected to the second output terminal of the transformer.

9. The crane according to claim 8, characterized in that, It also includes at least one first power supply interface, at least one second power supply interface, a first indicator module, a second indicator module, a third indicator module, and a third protection module; The first indicator module, the second indicator module, and the at least one first power supply interface are all connected between the first output terminal and the second output terminal of the transformer. The third indicator module and the at least one second power supply interface are all connected between the third output terminal and the second output terminal of the transformer. The third protection module is connected between the third output terminal of the transformer and the third indicator module.

10. The crane according to claim 9, characterized in that, The first indicator module includes a third switch and a second buzzer. The first end of the third switch is connected to the first end of the power supply module, the first end of the third switch is connected to the first end of the second buzzer, and the second end of the second buzzer is connected to the second end of the power supply module. The second indicator module includes a fourth switch and a second indicator light. The first end of the fourth switch is connected to the first end of the power supply module, the second end of the fourth switch is connected to the first end of the second indicator light, and the second end of the second indicator light is connected to the second end of the power supply module. The third indicator module includes a fifth switch and at least one third indicator light. The first end of the fifth switch is connected to the third end of the power supply module, and the at least one third indicator light is connected in parallel between the second end of the fifth switch and the second end of the power supply module. The third protection module includes a fourth fuse, the first end of which is connected to the third output terminal of the transformer, and the second end of which is connected to the first terminal of the fifth switch.

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