Control circuit of hoisting equipment and hoisting equipment

Abstract

The invention provides a control circuit of hoisting equipment and the hoisting equipment, the hoisting equipment comprises a starting control key and a hoisting device, and the control circuit comprises a starting unit and a control unit; the starting unit is used for accessing a starting signal and a first signal, the starting signal is a signal input by the starting control key, the starting unit is used for adjusting the first signal to an effective state based on the starting signal, and when the first signal is in the effective state, the first signal controls the hoisting device to start; the control unit is used for accessing a first signal and maintaining the first signal in an effective state after the starting unit adjusts the first signal to the effective state; the control unit is arranged to maintain the first signal in the effective state after the starting unit starts the lifting device, at the moment, even if the starting control key is loosened, the lifting device can still keep the starting state, and self-locking of the starting state of the lifting device can be achieved.

Description

Technical Field

[0001] This application belongs to the field of crane technology, and in particular relates to a control circuit for a lifting device and the lifting device itself. Background Technology

[0002] As key equipment in industrial production, logistics and transportation, lifting equipment is widely used in scenarios such as cargo hoisting, material transfer, and engineering construction. Its operational stability and safety directly affect production efficiency and the safety of personnel and property.

[0003] In related technologies, existing lifting equipment generally relies on the auxiliary contacts of the main contactor, along with relay devices, to construct the control logic in order to achieve the self-locking function of maintaining the operating state after startup. This leads to structural redundancy in the equipment, resulting in problems such as large space occupation and high cost. Summary of the Invention

[0004] The purpose of this application is to provide a control circuit and lifting equipment for lifting equipment, which aims to solve the problem of complex and redundant related structures for self-locking during startup in traditional lifting equipment.

[0005] A first aspect of this application provides a control circuit for a lifting device, the lifting device including a start control key and a lifting mechanism, the control circuit including: A starting unit is configured to receive a starting signal and a first signal, wherein the starting signal is a signal input by a starting control key, and the starting unit is configured to adjust the first signal to an effective state based on the starting signal, wherein the first signal controls the lifting device to start when the first signal is in an effective state. The control unit is configured to receive the first signal and maintain the first signal in an effective state after the start-up unit adjusts the first signal to an effective state.

[0006] In some embodiments of this application, the first signal in the active state is a low-level signal; The startup unit is used to set the first signal low based on the startup signal; The control unit is used to keep the first signal low after the startup unit sets the first signal low.

[0007] In some embodiments of this application, the start-up unit includes a first switch, one end of which is connected to a first power supply, and the other end of which is grounded. A first access terminal for receiving the first signal is provided between the first switch and the first power supply. The control terminal of the first switch is used to receive the start-up signal.

[0008] In some embodiments of this application, the lifting equipment further includes an emergency stop control key, and the control unit is further configured to receive an emergency stop signal, which is a signal input by the emergency stop control key. The control unit is configured to stop maintaining the first signal in a valid state based on the emergency stop signal.

[0009] In some embodiments of this application, the control unit includes a second switch, one end of which is connected to the first signal, and the other end of which is grounded. The level of the control electrode of the second switch is related to the emergency stop signal. When the emergency stop signal is at a low level, the second switch is turned on to pull the first signal low.

[0010] In some embodiments of this application, the control unit further includes a third switch, one end of which is connected to the control electrode of the second switch, and the level of the other end is related to the emergency stop signal. The control electrode of the third switch is connected to the first signal. When the emergency stop signal is low, the third switch is turned on to turn on the second switch.

[0011] In some embodiments of this application, the control unit further includes a fourth switch, one end of which is connected to a second power supply, the other end of which is connected to the other end of the third switch, and the control electrode of the fourth switch is connected to the emergency stop signal. Specifically, when the emergency stop signal is at a low level, the fourth switch is turned on to turn on the third switch.

[0012] In some embodiments of this application, the first power source and the second power source are the same power source.

[0013] In some embodiments of this application, the first switch, the second switch, the third switch, and the fourth switch are selected from MOSFETs or transistors.

[0014] A second aspect of this application also provides a lifting device, the lifting device including the control circuit as described above.

[0015] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: In the above-mentioned control circuit and lifting equipment of a lifting device, the lifting equipment includes a start control key and a lifting device, and the control circuit includes a start unit and a control unit; the start unit is used to receive a start signal and a first signal, the start signal being the signal input by the start control key, and the start unit is used to adjust the first signal to an effective state based on the start signal. When the first signal is in an effective state, the first signal controls the lifting device to start; the control unit is used to receive the first signal and to maintain the first signal in an effective state after the start unit adjusts the first signal to an effective state; in this application, the control unit is set to maintain the first signal in an effective state after the start unit starts the lifting device. At this time, even if the start control key is released, the lifting device can still maintain the start state, which is beneficial to realizing the self-locking of the start state of the lifting device. Attached Figure Description

[0016] Figure 1 A schematic diagram of the frame structure of the control circuit of the lifting equipment provided in an embodiment of this application; Figure 2 A schematic diagram of the circuit structure of the control circuit of the lifting equipment provided in an embodiment of this application; Figure 3 A schematic diagram of the frame structure of the control circuit of the lifting equipment provided in another embodiment of this application; Figure 4 A schematic diagram of the circuit structure of the control circuit of the lifting equipment provided in another embodiment of this application.

[0017] Specific element symbol explanations: 10-Start control key, 20-Lifting device, 30-Emergency stop control key, 100-Starting unit, 200-Control unit, Q25-First switch, Q14-Second switch, Q23-Third switch, Q24-Fourth switch, X10-Start signal, X10_1-First signal, X11-Emergency stop signal. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] It should be noted that when a component is referred to as being "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] It should be understood that the terms "length", "width", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] It's important to understand that lifting equipment, as key equipment in industrial production and logistics, is widely used in scenarios such as cargo hoisting, material transfer, and engineering construction. Its operational stability and safety directly impact production efficiency and the safety of personnel and property. This type of equipment is typically equipped with a start control button, which triggers the lifting device to start via a start signal, enabling core functions such as lifting and moving goods.

[0023] In related technologies, existing lifting equipment typically relies on auxiliary contacts of the main contactor and relay devices to construct control logic to maintain the self-locking function after startup. This solution requires forming a self-locking circuit through the contactor's auxiliary contacts and using relay devices to respond to emergency stop signals to disengage the self-lock. This results in redundant circuit structure and complex logic loops, increasing the internal space occupied by the equipment, limiting miniaturization design, and also causing problems such as high noise and high hardware costs. Furthermore, the collaborative operation of multiple devices increases the difficulty of circuit maintenance, and the system is more sensitive to external environmental interference, making it prone to self-locking failure or false triggering, thus affecting the reliable operation of the lifting equipment.

[0024] Based on this, this application improves the control circuit and lifting equipment of the relevant lifting equipment.

[0025] Please see Figure 1 , Figure 1A schematic diagram of the framework structure of the control circuit of the lifting equipment provided in this embodiment is shown. The lifting equipment of this embodiment includes a start control key 10 and a lifting device 20. The control circuit of the lifting equipment includes a start unit 100 and a control unit 200. The start unit 100 is used to receive a start signal X10 and a first signal X10_1. The start signal X10 is the signal input by the start control key 10. The start unit 100 is used to adjust the first signal X10_1 to an effective state based on the start signal X10. When the first signal X10_1 is in an effective state, the first signal X10_1 controls the lifting device 20 to start. The control unit 200 is used to receive the first signal X10_1 and to maintain the first signal X10_1 in an effective state after the start unit 100 adjusts the first signal X10_1 to an effective state.

[0026] It should be explained that lifting equipment is heavy machinery used for lifting and moving heavy objects, widely used in industrial production, engineering construction, and other scenarios. Its operation requires precise control through control circuits to achieve start-up, stop, and other operations, ensuring operational safety and efficiency. The start control key 10 is the operation input component of the lifting equipment, allowing operators to trigger start commands. It converts mechanical operations into electrical signals (i.e., start signal X10), which are transmitted to the control circuit. It is the core human-machine interface component for realizing the start control of the lifting equipment. The lifting device 20 is the core actuator in the lifting equipment that performs the function of lifting heavy objects. It includes key structures such as the motor and main contactor. It needs to receive control signals to start operation, and its working state directly determines the operating state of the lifting equipment.

[0027] The starting unit 100 is a module in the control circuit responsible for signal reception and initial adjustment. It can receive the starting signal X10 and the first signal X10_1, and can adjust the first signal X10_1 to an effective state with controllability based on the triggering state of the starting signal X10. The control unit 200 is a module in the control circuit responsible for signal maintenance. It receives the first signal X10_1 output by the starting unit 100. After the first signal X10_1 enters the effective state, it continuously maintains the effective state of the first signal X10_1 through its own circuit logic, ensuring that the lifting device 20 operates stably after startup and realizing the self-locking function. The starting signal X10 is an electrical signal input by the start control key 10. It is the initial command signal that triggers the start of the lifting equipment. Its state change (such as effective or ineffective) can be recognized by the starting unit 100, thereby starting the subsequent control logic. The first signal X10_1 is the core control signal in the control circuit used to control the start of the lifting device 20. It has two states: valid and invalid. When it is valid, it can drive the lifting device 20 to start. When it is invalid, the lifting device 20 stops running. Its state is jointly regulated by the starting unit 100 and the control unit 200.

[0028] It is understood that in this embodiment, the control unit 200 maintains the state of the first signal X10_1 after it is valid, thereby achieving self-locking upon startup. This ensures that the lifting device 20 will not unexpectedly stop due to the cancellation or fluctuation of the startup signal X10 after startup, avoiding safety hazards caused by sudden equipment stoppage during operation. The hardware circuits of the startup unit 100 and the control unit 200 directly trigger and maintain the self-locking of the startup signal X10, eliminating the need for additional external components. This significantly reduces the internal space occupied by the equipment, contributing to product miniaturization and reducing component procurement and assembly costs. By clearly defining the functional division between the startup unit 100 (signal triggering and adjustment) and the control unit 200 (signal maintenance), a clear hardware control logic is formed, reducing redundant links and lowering system sensitivity. At the same time, the simplified circuit structure reduces fault points, eliminating the need to disassemble complex external auxiliary components during later maintenance, facilitating rapid problem location and improving maintenance efficiency. The start unit 100 triggers the first signal X10_1 to become effective through the start signal X10, and the control unit 200 independently maintains the signal state. The two work together to meet the operator's need to quickly start the equipment through the start control key 10, and can also ensure the continuous operation of the equipment through the self-locking logic, without the need for manual continuous triggering of the start command.

[0029] In some embodiments of this application, the first signal X10_1 in the active state is a low-level signal; the start unit 100 is used to set the first signal X10_1 low based on the start signal X10; the control unit 200 is used to keep the first signal X10_1 low after the start unit 100 sets the first signal X10_1 low.

[0030] It is understood that, in this embodiment, the self-locking mechanism can be achieved without additional external components through hardware collaboration between the starting unit 100 and the control unit 200: after the starting signal X10 is triggered, the starting unit 100 sets the first signal X10_1 low to trigger the lifting device 20 to start. The control unit 200 then maintains the first signal X10_1 at a low level through a hardware loop. Even if the starting signal X10 is removed, the first signal X10_1 remains valid, replacing the self-locking function of traditional external components and reducing equipment size and cost. In this process, the starting unit 100 is only responsible for setting the signal low, and the control unit 200 is only responsible for maintaining the low level. The functional division is clear, and there is no complex closed-loop link. At the same time, the low-level signal has stronger anti-interference capability in the hardware circuit and is less likely to be falsely triggered or falsely removed due to voltage fluctuations, reducing system sensitivity issues. The control unit 200 continuously maintains the first signal X10_1 at a low level, which ensures that after the lifting device 20 is started, the first signal X10_1 will not rise back to an invalid state (high level) due to the accidental cancellation of the start signal X10 (such as the operator accidentally releasing the start control key 10) or external electromagnetic interference, thus avoiding the lifting device 20 from stopping unexpectedly during operation and preventing safety hazards such as falling objects and equipment collisions.

[0031] In some embodiments of this application, please refer to Figure 2 , Figure 2 A schematic diagram of the circuit structure of the lifting equipment provided in this embodiment is shown. The starting unit 100 of this embodiment includes a first switch Q25. One end of the first switch Q25 is connected to a first power supply, and the other end of the first switch Q25 is grounded. A first access terminal for connecting the first signal X10_1 is provided between the first switch Q25 and the first power supply. The control terminal of the first switch Q25 is used to connect the starting signal X10.

[0032] It should be explained that the first switch Q25 is a fundamental component in the electronic circuit used to control the on / off state of the circuit. It can change its on or off state through the signal received by the control electrode (such as the start signal X10), thereby regulating the transmission of current or voltage in the circuit. The first power supply is a power module that provides stable power to the start unit 100. It can output a continuous and fixed voltage to provide operating power to the first switch Q25 and related circuit components, ensuring that the start unit 100 can normally receive and process signals and adjust the state of the first signal X10_1.

[0033] It is understood that in this embodiment, the first signal X10_1 is directly controlled by the on / off state of the first switch Q25: when the start signal X10 triggers the first switch Q25 to turn on, the first signal X10_1 at the first access terminal is grounded through the first switch Q25, thus setting the first signal X10_1 low; signal adjustment can be completed without additional external devices, which helps reduce the internal space occupied by the equipment, facilitates product miniaturization, and reduces device cost and noise interference. The first switch Q25 directly receives the start signal X10 through the control electrode and can instantly change its on state (on or off), thereby quickly adjusting the state of the first signal X10_1 at the first access terminal. Compared with the mechanical action of external auxiliary devices in traditional solutions (such as contactor contact closing), the electronic response speed of the hardware switch is faster, which can shorten the delay time from start signal X10 input → first signal X10_1 validity → start of lifting device 20, improve the immediacy of lifting equipment operation, and adapt to the rapid start requirements of crane operation.

[0034] In some embodiments, the voltage of the first power supply is 24V.

[0035] In some embodiments of this application, please refer to Figure 3 , Figure 3A schematic diagram of the control circuit of the lifting equipment provided in this embodiment is shown. The lifting equipment in this embodiment also includes an emergency stop control key 30. The control unit 200 is also used to receive an emergency stop signal X11. The emergency stop signal X11 is a signal input by the emergency stop control key 30. The control unit 200 is used to stop maintaining the first signal X10_1 in an effective state based on the emergency stop signal X11.

[0036] It should be explained that the emergency stop control key 30 is a human-machine interface component on the lifting equipment used to trigger emergency stop operations. It allows operators to quickly input an emergency stop command in the event of a sudden hazard (such as equipment failure or personnel approaching), converting the mechanical operation into an electrical signal (i.e., emergency stop signal X11). The emergency stop signal X11 is an electrical signal input from the emergency stop control key 30. It is an emergency control signal with high priority (it can interrupt normal control logic). Its valid state (such as level changes) can be recognized by the control unit 200 and used to trigger the circuit actions related to the emergency stop of the equipment.

[0037] It is understood that in this embodiment, the emergency stop signal X11 is directly received by the control unit 200, and the self-locking logic can be interrupted without external devices: During normal operation, the control unit 200 maintains the first signal X10_1 valid (the lifting device 20 is working). After the emergency stop signal X11 is triggered, the control unit 200 immediately stops the maintenance action, the first signal X10_1 returns to an invalid state, and the lifting device 20 stops due to power failure, replacing the emergency stop function of traditional relays, reducing equipment size and cost. The control unit 200 integrates the dual functions of self-locking maintenance and emergency stop interruption, with a clear logic link (the emergency stop signal X11 directly acts on the control unit 200), no redundant links, and reduced system sensitivity issues caused by complex links. After the emergency stop signal X11 is triggered, the control unit 200 stops maintaining the first signal X10_1 as valid, and restores the first signal X10_1 to an invalid state. The lifting device 20 is completely de-energized and stops. It will not automatically resume operation due to the cancellation of the emergency stop signal X11 (it needs to be restarted by triggering the start unit 100 to lower the first signal X10_1 again via the start control key 10), thus avoiding the risk of the equipment restarting unexpectedly after the emergency stop is released.

[0038] In some embodiments of this application, please refer to Figure 4 , Figure 4 A schematic diagram of the circuit structure of the control circuit of the lifting equipment provided in this embodiment is shown. The control unit 200 of this embodiment includes a second switch Q14. One end of the second switch Q14 is connected to the first signal X10_1, and the other end of the second switch Q14 is grounded. The level of the control electrode of the second switch Q14 is related to the emergency stop signal X11. When the emergency stop signal X11 is low, the second switch Q14 is turned on to pull down the first signal X10_1.

[0039] It should be explained that the second switch Q14 is a basic actuator in the electronic circuit used to regulate the signal level. It changes its on or off state by receiving the level signal at the control electrode, thereby realizing the potential control of the target signal (such as the first signal X10_1).

[0040] It is understood that in this embodiment, the emergency stop signal X11 and the first signal X10_1 are directly linked through the second switch Q14: when the emergency stop signal X11 is low (if self-locking needs to be maintained after the emergency stop is released), the second switch Q14 is turned on to pull the first signal X10_1 low, continuously maintaining the first signal X10_1 in an effective state (ensuring the operation of the lifting device 20); when the emergency stop signal X11 becomes high (emergency stop triggered), the control electrode level changes accordingly, causing the second switch Q14 to turn off, stopping the pull of the first signal X10_1 low, and the first signal X10_1 returns to an ineffective state (the lifting device 20 stops). The switching between self-locking maintenance and emergency stop interruption can be completed without external devices, which helps to reduce the size and cost of the equipment. At the same time, after an emergency stop, the first signal X10_1 needs to be reset to low through the starting unit 100 to resume operation, avoiding accidental restart of the equipment after the emergency stop is released, further improving the safety of lifting operations.

[0041] Please refer to the embodiments described in this application. Figure 4 The control unit 200 in this embodiment also includes a third switch Q23. One end of the third switch Q23 is connected to the control electrode of the second switch Q14, and the level of the other end is related to the emergency stop signal X11. The control electrode of the third switch Q23 is connected to the first signal X10_1. When the emergency stop signal X11 is low, the third switch Q23 is turned on to turn on the second switch Q14.

[0042] It is understood that the embodiments of this application form a closed-loop self-locking through the coordinated control of the third switch Q23 and the second switch Q14: when the emergency stop signal X11 is low (safe state), if the first signal X10_1 is already set low (after startup), the control electrode of the third switch Q23 is low and turned on, so that the control electrode level of the second switch Q14 meets the conduction condition, and the second switch Q14 turns on and pulls the first signal X10_1 low, continuously maintaining self-locking; the whole process does not require external devices, and stable self-locking can be achieved only through the hardware linkage of the two-stage switches, reducing the size and cost of the equipment.

[0043] Please refer to the embodiments described in this application. Figure 4The control unit 200 in this embodiment also includes a fourth switch Q24. One end of the fourth switch Q24 is connected to the second power supply, and the other end of the fourth switch Q24 is connected to the other end of the third switch Q23. The control electrode of the fourth switch Q24 is connected to the emergency stop signal X11. When the emergency stop signal X11 is at a low level, the fourth switch Q24 is turned on to turn on the third switch Q23.

[0044] It is understood that in this embodiment of the application, the emergency stop signal X11 is associated with the second power supply path through the fourth switch Q24: only when the emergency stop signal X11 is low level (safe state), the fourth switch Q24 is turned on, and the second power supply can provide power to the third switch Q23; at this time, if the first signal X10_1 is low level (after startup), the third switch Q23 is turned on and triggers the second switch Q14 to pull the first signal X10_1 low, forming a complete self-locking closed loop.

[0045] In some embodiments, the voltage of the second power supply is 24V.

[0046] In some embodiments of this application, the first power supply and the second power supply are the same power supply. Exemplarily, both the first power supply and the second power supply are... Figure 4 P24V in the middle.

[0047] In some embodiments of this application, the first switch Q25, the second switch Q14, the third switch Q23, and the fourth switch Q24 are selected from MOSFETs or transistors.

[0048] In some embodiments, the first switch Q25, the second switch Q14, the third switch Q23, and the fourth switch Q24 are all transistors.

[0049] In some embodiments, please continue reading Figure 2 and Figure 4 After the emergency stop control button 30 of the lifting equipment is turned on, the emergency stop signal X11 becomes invalid (the emergency stop signal X11 is a level signal, which is effective when high and is pulled low when invalid). The transistor of the fourth switch Q24 is turned on, and the 24V power supply (second power supply) is sent to the transmitter stage of the third switch Q23. After the start signal X10 becomes valid (the start signal X10 is an edge signal, active low), the first switch Q25 turns on, pulling the first signal X10_1 low. At this time, the emitter voltage of the third switch Q23 is high and the base voltage is low, so the third switch Q23 turns on. The base of the transistor in the second switch Q14 is energized, and the second switch Q14 also turns on, further pulling the first signal X10_1 low. If the start signal X10 returns to invalid (high level) at this time, the first signal X10_1 is pulled down to low level through the second switch Q14 and will not change with the start signal X10, thus realizing the self-locking logic for starting the lifting equipment (the first signal X10_1 is the control signal of the main contactor of the lifting equipment. When the self-locking is low, the main contactor is energized, the whole machine is energized, and the lifting device 20 works; after the first signal X10_1 returns to high level, the main contactor is de-energized, the whole machine is de-energized, and the lifting device 20 stops working).

[0050] After the first signal X10_1 self-locks, simply press the emergency stop control button 30 on the lifting equipment. The emergency stop signal X11 becomes valid (the emergency stop signal X11 is a level signal, active high). At this time, the fourth switch Q24 is open, the emitter of the third switch Q23 cannot be energized, and therefore cannot conduct. The base of the second switch Q14 also cannot be energized, the self-locking circuit fails, and the first signal X10_1 is pulled high. Since the first signal X10_1 can no longer maintain self-locking, the emergency stop recovery logic of the lifting equipment is realized (after the emergency stop is recovered, the main contactor of the lifting equipment loses power, and the entire machine is powered off).

[0051] Furthermore, in order to better implement the control circuit of the lifting equipment in any of the above embodiments, based on the control circuit described above, this application embodiment also provides a lifting equipment, which includes the control circuit described above.

[0052] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0053] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0054] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0055] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0056] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A control circuit for a lifting device, characterized in that, The lifting equipment includes a start control key and a lifting device, and the control circuit includes: A starting unit is configured to receive a starting signal and a first signal, wherein the starting signal is a signal input by a starting control key, and the starting unit is configured to adjust the first signal to an effective state based on the starting signal, wherein the first signal controls the lifting device to start when the first signal is in an effective state. The control unit is configured to receive the first signal and maintain the first signal in an effective state after the start-up unit adjusts the first signal to an effective state.

2. The control circuit of the lifting equipment according to claim 1, characterized in that, The first signal, when in an active state, is a low-level signal; The startup unit is used to set the first signal low based on the startup signal; The control unit is used to keep the first signal low after the startup unit sets the first signal low.

3. The control circuit of the lifting equipment according to claim 2, characterized in that, The starting unit includes a first switch, one end of which is connected to a first power supply and the other end of which is grounded. A first access terminal for receiving the first signal is provided between the first switch and the first power supply. The control terminal of the first switch is used to receive the starting signal.

4. The control circuit of the lifting equipment according to claim 3, characterized in that, The lifting equipment also includes an emergency stop control key, and the control unit is also used to receive an emergency stop signal, which is a signal input by the emergency stop control key. The control unit is used to stop maintaining the first signal in a valid state based on the emergency stop signal.

5. The control circuit of the lifting equipment according to claim 4, characterized in that, The control unit includes a second switch, one end of which is connected to the first signal, and the other end of which is grounded. The level of the control electrode of the second switch is related to the emergency stop signal. When the emergency stop signal is at a low level, the second switch is turned on to pull the first signal low.

6. The control circuit of the lifting equipment according to claim 5, characterized in that, The control unit further includes a third switch, one end of which is connected to the control electrode of the second switch, and the level of the other end is related to the emergency stop signal. The control electrode of the third switch is connected to the first signal. When the emergency stop signal is low, the third switch is turned on to turn on the second switch.

7. The control circuit of the lifting equipment according to claim 6, characterized in that, The control unit also includes a fourth switch, one end of which is connected to a second power supply, and the other end of which is connected to the other end of the third switch. The control electrode of the fourth switch is connected to the emergency stop signal. Specifically, when the emergency stop signal is at a low level, the fourth switch is turned on to turn on the third switch.

8. The control circuit of the lifting equipment according to claim 7, characterized in that, The first power supply and the second power supply are the same power supply.

9. The control circuit of the lifting equipment according to claim 7, characterized in that, The first switching element, the second switching element, the third switching element, and the fourth switching element are selected from MOSFETs or transistors.

10. A lifting device, characterized in that, The lifting equipment includes the control circuit as described in any one of claims 1 to 9.

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