A crane hook safety protection system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HOUTAI (HUBEI) HOISTING EQUIP CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-08-07
AI Technical Summary
[0005]本实用新型的目的在于克服上述技术不足，提出一种起重机吊钩安全防护系统，解决现有技术中因司机室内操作人员仅靠目视观察无法准确地获取被吊物体的起吊高度、重量及吊物状态等信息，从而导致升降机构在起吊作业时存在安全隐患的技术问题
[0020]与现有技术相比，本实用新型提供的起重机吊钩安全防护系统的有益效果包括：摄像装置的摄像端朝向吊钩的升降区域设置，用于获取吊钩升降过程中升降区域内被吊物体的图像或视频信息，检测器连接于吊钩或起升卷筒，用于检测吊钩的高度，高度限制器与检测器及电机相连接，用于在吊钩达到设定高度时控制电机停止驱动，超载限制器与电机电连接用于检测吊钩的起吊重量，并在起吊重量超过设定值时控制电机停止驱动。相较于现有技术，通过在起升机构上设置摄像装置，能够对升降区域的图像和视频信息进行采集，再通过检测器和高度限制器对吊钩吊起物体时的高度进行检测和限制，使其能够在设定高度时实现自动停止，并且通过超载限制器对吊钩吊起物体时的重量进行限制，使其能够在设定重量时实现自动停止，能够辅助司机室内的操作人员准确地获取吊物起吊高度、重量及吊物状态等信息，能够提升操作的安全性和可靠性，能解决现有技术中因司机室内操作人员仅靠目视观察无法准确地获取被吊物体的起吊高度、重量及吊物状态等信息，从而导致升降机构在起吊作业时存在安全隐患的技术问题。
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Figure CN224604521U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lifting equipment technology, specifically to a crane hook safety protection system. Background Technology
[0002] The lifting mechanisms of electric double-girder bridge cranes, casting cranes, and unloading double-trolley cranes used in steel smelting plants to lift large-sized and heavy objects directly affect and determine the efficiency of production.
[0003] When lifting large and heavy objects, the potential hazards to personnel below during the lifting process are unpredictable. Currently, operators in the driver's cab rely solely on visual observation of the object's height, making it impossible to determine whether the object is securely attached or the lifting height of the hook. Furthermore, operators cannot monitor the status of the lifting mechanism's height limit switch or the real-time online operation of the lifting motor. This results in poor safety and reliability of the lifting mechanism when lifting heavy objects, leading to not only high risks but also low efficiency, severely impacting economic benefits and the operational efficiency of crane manufacturers.
[0004] Currently, with the improvement of the reliability and safety of crane operations in steel smelters and steel mills, the requirements for collaborative operation between operators and auxiliary personnel below during the lifting of large objects by the hoisting mechanism hook have been further strengthened and improved. Utility Model Content
[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a crane hook safety protection system to solve the technical problem that the operator in the driver's cab cannot accurately obtain information such as the lifting height, weight and status of the object being lifted by visual observation alone, which leads to safety hazards in the lifting mechanism during lifting operations.
[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:
[0007] This utility model provides a crane hook safety protection system. The crane includes a boom, a trolley frame, and a hoisting mechanism. The trolley frame is slidably connected to the boom along its length. The hoisting mechanism includes a base, a hoisting drum, a rope, a hook, and a motor. The base is connected to the trolley frame, the hoisting drum is rotatably connected to the base, one end of the rope is wound around the hoisting drum, the hook is connected to the other end of the rope, and the motor is connected to the hoisting drum and the trolley frame. The crane hook safety protection system includes:
[0008] A camera device is connected to the trolley frame, and the camera end of the camera device faces the lifting area of the hook;
[0009] A height limiting device includes a detector and a height limiter. The detector is connected to the hook or the hoisting drum and is used to detect the height of the hook. The height limiter is connected to the detector and a motor and is used to control the motor to stop driving when the hook reaches a set height.
[0010] An overload limiter, connected to the base and the trolley frame and electrically connected to the motor, is used to detect the lifting weight of the hook and control the motor to stop driving when the lifting weight exceeds a set value.
[0011] In some embodiments, the detector is connected to the hook, and the detector is a height sensor used to detect the height of the hook.
[0012] In some embodiments, the detector is connected to the hoisting drum, and the detector is an encoder used to detect the rotation speed of the hoisting drum and determine the height of the hook based on the rotation speed of the hoisting drum.
[0013] In some embodiments, the crane hook safety protection system further includes a hoisting safety control device, which includes a main controller and a hoisting safety signal controller. The main controller is connected to the boom and electrically connected to the detector, height limiter, overload limiter, and camera device. The hoisting safety signal controller is connected to the trolley frame and electrically connected to the detector, height limiter, motor, and main controller.
[0014] In some embodiments, the hoisting safety signal controller and the main controller can form a wireless communication connection.
[0015] In some embodiments, the lifting safety control device further includes an inductor transformer connected to the power supply line of the motor for detecting the input voltage of the motor.
[0016] In some embodiments, the lifting safety control device further includes a current transformer connected to the power supply line of the motor for detecting the input current of the motor.
[0017] In some embodiments, a crane walkway is formed on one side of the boom, and the lifting safety control device further includes a control cabinet, which is disposed on the crane walkway and connected to the boom. The inductor and current transformers are both built into the control cabinet and electrically connected to the main controller.
[0018] In some embodiments, the crane hook safety protection system further includes a driver's cab and a power distribution box, wherein the driver's cab is connected to one end of the boom, the power distribution box is built into the driver's cab, and the main controller is built into the power distribution box.
[0019] In some embodiments, the crane hook safety protection system further includes an upper machine position, which is built into the driver's cab and electrically connected to the main controller.
[0020] Compared with the prior art, the beneficial effects of the crane hook safety protection system provided by this utility model include: the camera end of the camera device is set facing the lifting area of the hook to obtain image or video information of the object being lifted in the lifting area during the lifting process of the hook; the detector is connected to the hook or the hoisting drum to detect the height of the hook; the height limiter is connected to the detector and the motor to control the motor to stop driving when the hook reaches the set height; and the overload limiter is electrically connected to the motor to detect the lifting weight of the hook and control the motor to stop driving when the lifting weight exceeds the set value. Compared to existing technologies, by installing a camera device on the lifting mechanism, image and video information of the lifting area can be collected. Then, the height of the object lifted by the hook can be detected and limited by the detector and height limiter, so that it can automatically stop at the set height. Furthermore, the weight of the object lifted by the hook can be limited by the overload limiter, so that it can automatically stop at the set weight. This can help the operator in the cab to accurately obtain information such as the lifting height, weight, and status of the object, thereby improving the safety and reliability of the operation. It can solve the technical problem in existing technologies where the operator in the cab cannot accurately obtain information such as the lifting height, weight, and status of the object by visual observation alone, which leads to safety hazards in the lifting mechanism during lifting operations. Attached Figure Description
[0021] Figure 1 This is a structural schematic diagram of a crane hook safety protection system provided in one embodiment of the present invention;
[0022] Figure 2 This is a structural schematic diagram from another perspective of a crane hook safety protection system provided in one embodiment of the present invention;
[0023] Figure 3 This is a schematic diagram showing the main controller and the hoisting safety signal controller, motor, camera device, height limiting device, detector, height limiter, overload limiter, inductor transformer, current transformer and upper-level electrical connection provided in an embodiment of this utility model.
[0024] Explanation of reference numerals in the attached figures:
[0025] 1. Boom; 2. Trolley frame; 3. Lifting mechanism; 31. Base; 32. Lifting drum; 33. Rope; 34. Hook; 35. Motor; 4. Camera device; 5. Height limiting device; 51. Detector; 52. Height limiter; 6. Overload limiter; 7. Lifting safety control device; 71. Main controller; 72. Lifting safety signal controller; 73. Inductor; 74. Current transformer; 8. Crane walkway; 9. Control cabinet; 10. Driver's cab; 11. Distribution box; 12. Upper machine position. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0027] To address the technical problem in existing technologies where operators in the cab 10 cannot accurately obtain information such as the lifting height, weight, and status of the suspended object through visual observation alone, thus posing safety hazards during lifting operations, this utility model provides a crane hook 34 safety protection system. This system utilizes a camera device 4 installed on the lifting mechanism 3 to collect image and video information of the lifting area. A detector 51 and a height limiter 52 detect and limit the height of the object lifted by the hook 34, enabling it to automatically stop at a set height. Furthermore, an overload limiter 6 limits the weight of the object lifted by the hook 34, enabling it to automatically stop at a set weight. This system assists operators in the cab 10 in accurately obtaining information such as the lifting height, weight, and status of the suspended object, thereby improving operational safety and reliability.
[0028] In this embodiment, as Figure 1 , Figure 2 As shown, the crane includes a boom 1, a trolley frame 2, and a lifting mechanism 3. The trolley frame 2 is slidably connected to the boom 1 along its length. The lifting mechanism 3 includes a base 31, a lifting drum 32, a rope 33, a hook 34, and a motor 35. The base 31 is connected to the trolley frame 2, the lifting drum 32 is rotatably connected to the base 31, one end of the rope 33 is wound around the lifting drum 32, the hook 34 is connected to the other end of the rope 33, and the motor 35 is connected to the lifting drum 32 and the trolley frame 2.
[0029] Furthermore, by driving the rope 33 to wind around the lifting drum 32 via the motor 35, the hook 34 and the object being lifted can be raised and lowered relative to the trolley frame 2 and the boom 1. This is a conventional setting known to those skilled in the art, and will not be described in detail here.
[0030] Please see Figures 1 to 3 , Figure 1 , Figure 2 This is a schematic diagram of a crane hook safety protection system according to an embodiment of the present invention. The crane hook 34 safety protection system includes: a camera device 4, a height limiting device 5, and an overload limiter 6. The camera device 4 is connected to the trolley frame 2, and the camera end of the camera device 4 faces the lifting area of the hook 34. The height limiting device 5 includes a detector 51 and a height limiter 52. The detector 51 is connected to the hook 34 or the lifting drum 32 and is used to detect the height of the hook 34. The height limiter 52 is connected to the detector 51 and the motor 35 and is used to control the motor 35 to stop driving when the hook 34 reaches the set height. The overload limiter 6 is connected to the base 31 and the trolley frame 2 and is electrically connected to the motor 35. It is used to detect the lifting weight of the hook 34 and control the motor 35 to stop driving when the lifting weight exceeds the set value.
[0031] In this device, by installing a camera device 4 on the lifting mechanism 3, image and video information of the lifting area can be collected. Then, the height of the object lifted by the hook 34 is detected and limited by the detector 51 and the height limiter 52, so that it can automatically stop at the set height. Furthermore, the weight of the object lifted by the hook 34 is limited by the overload limiter 6, so that it can automatically stop at the set weight. This device can help the operator in the cab 10 to accurately obtain information such as the lifting height, weight and status of the object, thereby improving the safety and reliability of the operation. It can solve the technical problem in the prior art that the operator in the cab 10 cannot accurately obtain information such as the lifting height, weight and status of the object by visual observation alone, which leads to safety hazards in the lifting mechanism during lifting operations.
[0032] Furthermore, the camera device 4 here is a common and readily available video capture camera on the market, such as an AI camera, which can accurately capture and track information about the safe working range of ground support personnel in real time, and then transmit the data wirelessly. Further details will not be elaborated here.
[0033] Furthermore, the height limiter 52 is a common and readily available device on the market. It is a core component of the crane safety system, used to prevent the hook 34 or the load from exceeding the preset travel limit, thus avoiding collisions or structural damage. Its key functions include: threshold detection, real-time monitoring of the hook 34 height and comparison with preset safety values; graded alarms, triggering warnings (such as audible and visual alerts) or direct emergency braking; and redundant protection, working in conjunction with the main controller 71 and the safety controller to achieve a dual safety link. The height limiter 52 includes: a height sensor, an alarm output, and a communication interface. The height sensor's signal type is analog (4-20mA), connected to the main controller 71 AI module; the alarm output's signal type is dry contact (24VDC), connected to the safety controller DI module; and the communication interface's signal type is RS485 / Modbus, connected to the main controller 71 communication bus. Further details are omitted here.
[0034] Furthermore, the overload limiter 6 is a common and readily available device on the market. It is a critical safety device for cranes, used to monitor the lifting load in real time and prevent structural damage or overturning due to overload. Its core functions include: real-time load monitoring, acquiring actual load data through sensors and dynamically comparing it with the rated load; graded safety response, including early warning (triggering an audible and visual alarm when the load reaches 90% of the rated value) and emergency braking (cutting off power and activating mechanical braking when the load exceeds 105%); and redundant protection, forming a dual-channel safety link in conjunction with the main controller 71 and the safety controller. The height limiter 52 includes a weighing sensor, an alarm output, and a communication interface. The weighing sensor's signal type is analog (0-10V), connected to the main controller 71 AI module; the alarm output's signal type is dry contact (24VDC), connected to the safety controller DI module; and the communication interface's signal type is CAN bus / Modbus RTU, connected to the main controller 71 communication bus. Further details are omitted here.
[0035] In this embodiment, detector 51 is connected to hook 34, and detector 51 is a height sensor used to detect the height of hook 34.
[0036] When the height detector 51 is connected to the hook 34, the height detector 51 is a height sensor used to detect the height of the hook 34. The signal type of the height sensor here is: analog signal (4-20mA), and the connected device is: main controller 71AI module, which will not be described in detail here.
[0037] In one embodiment, detector 51 is connected to hoisting drum 32 and is an encoder used to detect the rotation speed of hoisting drum 32 and determine the height of hook 34 based on the rotation speed of hoisting drum 32.
[0038] When the height detector 51 is connected to the hoisting drum 32, the height detector 51 is an encoder used to detect the rotation speed of the hoisting drum 32 and sequentially determine the height of the hook 34.
[0039] Furthermore, the encoder here is used for precise detection of position, speed, and direction, supports safety logic and dynamic speed adjustment, and belongs to the absolute encoder type. It can memorize the position after power failure, has strong anti-interference, and its resolution is ≥17 bits (absolute type), ensuring that the positioning error of the hook 34 is ≤1cm; protection level: IP67 / IP69K (suitable for dusty, humid, and oily environments); interface type: SSI / RS485: commonly used for absolute encoders, supporting long-distance transmission; HTL / TTL: incremental encoder pulse signal, matched with PLC high-speed counting module, which will not be elaborated further here.
[0040] In this embodiment, as Figure 1 , Figure 2 As shown, it also includes a hoisting safety control device 7, which includes a main controller 71 and a hoisting safety signal controller 72. The main controller 71 is connected to the boom 1 and is electrically connected to the detector 51, the height limiter 52, the overload limiter 6 and the camera device 4. The hoisting safety signal controller 72 is connected to the trolley frame 2 and is electrically connected to the detector 51, the height limiter 52, the motor 35 and the main controller 71.
[0041] The main controller 71 and the hoisting safety signal controller 72 are electrically connected to the detector 51, the height limiter 52, the overload limiter 6, the motor 35 and the camera device 4, respectively. The main controller 71 and the hoisting safety signal controller 72 can communicate with each other to realize automated and intelligent control.
[0042] Furthermore, the input terminals of the main controller 71 are: electrically connected to the height detector 51, receiving 4-20mA analog signals via the AI module to calculate the position of the hook 34 in real time; electrically connected to the height limiter 52, receiving dry contact alarm signals (normally open / normally closed contacts) via the DI module to trigger deceleration logic; electrically connected to the overload limiter 6, acquiring load data via the RS485 communication protocol, and simultaneously sending an alarm to the safety controller when overloaded; and electrically connected to the camera device 4, transmitting video streams via PoE power supply and Ethernet for auxiliary positioning. The output terminals of the main controller 71 are connected to the motor 35, controlling speed regulation via PWM signals, and simultaneously receiving status feedback from the motor 35 (such as temperature and speed).
[0043] Furthermore, the input terminals of the hoisting safety signal controller 72 are electrically connected to the height limiter 52, directly triggering the safety logic by connecting the alarm contact via a hard wire (24VDC), bypassing the main controller 71; and electrically connected to the overload limiter 6, with the alarm contact connected via an independent hard wire to ensure redundant monitoring. The output terminal of the hoisting safety signal controller 72 is connected to the safety relay, controlling the relay contacts through the safety DO module to directly cut off the power supply to the motor 35 or activate the brake (response time ≤50ms).
[0044] In one embodiment, such as Figure 3 As shown, the hoisting safety signal controller 72 and the main controller 71 can form a wireless communication connection.
[0045] By setting up a wireless communication connection, the wiring harness between the hoisting safety signal controller 72 and the main controller 71 can be reduced.
[0046] Furthermore, the wireless communication logic between the hoisting safety signal controller 72 and the main controller 71 is implemented, for example, in a safety link architecture. The main controller 71 receives encrypted status data from the safety signal controller (such as hook 34 height and load weight). It then issues control commands (such as hoisting speed adjustment) via the wireless link. The safety signal controller sends real-time safety status information (hard-wired signal + wireless redundancy). It independently verifies the validity of the main controller 71's commands and triggers local hard-wired protection when limits are exceeded. Wireless communication between the hoisting safety signal controller 72 and the main controller 71 can be achieved by configuring the communication protocol; further details are omitted here.
[0047] In this embodiment, as Figures 1 to 3 As shown, the lifting safety control device 7 also includes an inductor transformer 73, which is connected to the power supply line of the motor 35 and is used to detect the input voltage of the motor 35.
[0048] The input voltage of the motor 35 is monitored by the current transformer 73, which protects the main controller 71.
[0049] Furthermore, the current transformer 73 here is a conventional configuration known to those skilled in the art, and will not be described in detail here.
[0050] In one embodiment, please refer to Figures 1 to 3 The lifting safety control device 7 also includes a current transformer 74, which is connected to the power supply line of the motor 35 and is used to detect the input current of the motor 35.
[0051] The input current of the motor 35 is monitored by the current transformer 74, which protects the main controller 71.
[0052] Furthermore, the current transformer 74 is a conventional configuration known to those skilled in the art, and will not be described in detail here.
[0053] In this embodiment, as Figure 1 , Figure 2 As shown, a crane platform 8 is formed on one side of the boom 1. The lifting safety control device 7 also includes a control cabinet 9. The control cabinet 9 is located on the crane platform 8 and connected to the boom 1. The inductor 73 and the current transformer 74 are both built into the control cabinet 9 and are electrically connected to the main controller 71.
[0054] The control cabinet 9 is used to install and connect the inductor transformer 73 and the current transformer 74, and to protect the inductor transformer 73 and the current transformer 74.
[0055] Furthermore, the control cabinet 9 here is a common and readily available piece of equipment on the market, and is a standard setup known to those skilled in the art, so it will not be described in detail here.
[0056] In one embodiment, please refer to Figure 1 , Figure 2 The system also includes a driver's cab 10 and a power distribution box 11. The driver's cab 10 is connected to one end of the boom 1, the power distribution box 11 is built into the driver's cab 10, and the main controller 71 is built into the power distribution box 11.
[0057] The power distribution box 11 is located in the driver's cab 10. It is used to supply power to the main controller 71 and to provide protection for the main controller 71. The power distribution box 11 is a common and readily available device on the market and is a conventional setup known to those skilled in the art. It will not be described in detail here.
[0058] Furthermore, the main controller 71 is installed in the driver's cab 10 via the power distribution box 11, which facilitates its use by the operator.
[0059] In one embodiment, please refer to Figure 1 , Figure 2 The system also includes an upper control station 12, which is built into the driver's cab 10 and electrically connected to the main controller 71.
[0060] By setting the upper camera position 12, the user can clearly see the video information obtained by the camera device 4, the information of the height limiter 52, the information of the overload limiter 6, the height information obtained by the detector 51, the voltage information obtained by the inductor 73, and the current information obtained by the current transformer 74. Based on the above information, the user can accurately know the lifting height, weight, and status of the object being lifted, and can quickly and efficiently complete the lifting operation, and make corresponding adjustments to deal with emergencies, thereby improving the completeness and reliability of the lifting operation.
[0061] Furthermore, the upper position 12 here can be a monitor or control panel, which can accurately reflect the detection data and perform corresponding operations. This is a common and readily available device on the market, and is a conventional setting known to those skilled in the art, so it will not be described in detail here.
[0062] To better understand this utility model, the following is combined with... Figures 1 to 3 The technical solution of this utility model is described in detail below:
[0063] The camera end of the camera device 4 is set facing the lifting area of the hook 34 to acquire image or video information of the object being lifted in the lifting area during the lifting process of the hook 34. The detector 51 is connected to the hook 34 or the lifting drum 32 to detect the height of the hook 34. The height limiter 52 is connected to the detector 51 and the motor 35 to control the motor 35 to stop driving when the hook 34 reaches the set height. The overload limiter 6 is electrically connected to the motor 35 to detect the lifting weight of the hook 34 and to control the motor 35 to stop driving when the lifting weight exceeds the set value.
[0064] Furthermore, by installing a camera device 4 on the lifting mechanism 3, image and video information of the lifting area can be collected. Then, the height of the object lifted by the hook 34 is detected and limited by the detector 51 and the height limiter 52, so that it can automatically stop at the set height. The weight of the object lifted by the hook 34 is limited by the overload limiter 6, so that it can automatically stop at the set weight. This can help the operator in the driver's cab 10 to accurately obtain information such as the lifting height, weight and status of the object, thereby improving the safety and reliability of the operation.
[0065] In operation, the hoisting safety signal controller 72 first receives and collects the switching signals of the height limiter 52, the position information of the detector 51, the weight information of the overload limiter 6, and the information of the ground auxiliary personnel's safe working range, which is tracked and captured in real time by the camera device 4. Then, it interacts with the main controller 71 of the power distribution box 11 in the driver's cab 10 via wireless transmission. This allows the hoisting mechanism 3 to control the lifting and lowering of heavy objects based on changes in the height and position of the load, the presence or absence of load, and the safety and reliability of the load hook, combined with the detection of the safe position of the human body within an 8m range on the ground. Then, the voltage transformer and current transformer 74 detect the voltage and current of the hoisting mechanism 3 in real time and participate in the control of the hoisting mechanism 3. Finally, the status of the height limiter 52, the height position value, the weight data of the load, the real-time human body AI tracking video, and the operating voltage and current values of the hoisting mechanism 3 motor 35 are displayed in real time on the host computer, facilitating the operation of the hoisting personnel.
[0066] This system, through the aforementioned structure, can solve the technical problem in the prior art where the operator in the driver's cab 10 cannot accurately obtain information such as the lifting height, weight, and status of the object being lifted by visual observation alone, thus causing safety hazards in the lifting mechanism during lifting operations.
[0067] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.
Claims
1. A crane hook safety protection system, the crane comprising a boom, a trolley frame, and a hoisting mechanism, the trolley frame being slidably connected to the boom along the length of the boom; the hoisting mechanism comprising a base, a hoisting drum, a rope, a hook, and a motor, the base being connected to the trolley frame, the hoisting drum being rotatably connected to the base, one end of the rope being wound around the hoisting drum, the hook being connected to the other end of the rope, and the motor being connected to the hoisting drum and the trolley frame, characterized in that... include: A camera device is connected to the trolley frame, and the camera end of the camera device faces the lifting area of the hook; A height limiting device includes a detector and a height limiter. The detector is connected to the hook or the hoisting drum and is used to detect the height of the hook. The height limiter is connected to the detector and a motor and is used to control the motor to stop driving when the hook reaches a set height. An overload limiter, connected to the base and the trolley frame and electrically connected to the motor, is used to detect the lifting weight of the hook and control the motor to stop driving when the lifting weight exceeds a set value.
2. The crane hook safety protection system according to claim 1, characterized in that, The detector is connected to the hook and is a height sensor used to detect the height of the hook.
3. The crane hook safety protection system according to claim 1, characterized in that, The detector is connected to the hoisting drum and is an encoder used to detect the rotation speed of the hoisting drum and determine the height of the hook based on the rotation speed of the hoisting drum.
4. The crane hook safety protection system according to claim 1, characterized in that, It also includes a hoisting safety control device, which includes a main controller and a hoisting safety signal controller. The main controller is connected to the boom and electrically connected to the detector, height limiter, overload limiter and camera device. The hoisting safety signal controller is connected to the trolley frame and electrically connected to the detector, height limiter, motor and main controller.
5. The crane hook safety protection system according to claim 4, characterized in that, The hoisting safety signal controller and the main controller can form a wireless communication connection.
6. The crane hook safety protection system according to claim 4, characterized in that, The lifting safety control device also includes an inductor transformer, which is connected to the power supply line of the motor and is used to detect the input voltage of the motor.
7. The crane hook safety protection system according to claim 6, characterized in that, The lifting safety control device also includes a current transformer, which is connected to the power supply line of the motor and is used to detect the input current of the motor.
8. The crane hook safety protection system according to claim 7, characterized in that, A crane walkway is formed on one side of the boom. The lifting safety control device also includes a control cabinet, which is located on the crane walkway and connected to the boom. The inductor and current transformers are both built into the control cabinet and are electrically connected to the main controller.
9. The crane hook safety protection system according to claim 7, characterized in that, It also includes a driver's cab and a power distribution box. The driver's cab is connected to one end of the boom, the power distribution box is built into the driver's cab, and the main controller is built into the power distribution box.
10. The crane hook safety protection system according to claim 9, characterized in that, It also includes an upper control unit, which is built into the driver's cab and electrically connected to the main controller.