A tower crane hook vertical positioning system

Abstract

This invention provides a vertical positioning system for a tower crane hook, belonging to the field of tower crane positioning technology. The tower crane hook lighting and positioning system includes a camera module, a displacement measurement module, a lighting module, an alarm module, a positioning module, and a power supply module. The camera module takes continuous, equally spaced photos of the hook below the tower crane's moving trolley and transmits them to the positioning module. The displacement measurement module detects the displacement of the tower crane's moving trolley and the hook and transmits this information to the positioning module. The lighting module illuminates the environment below the tower crane's moving trolley. The alarm module issues an alarm. The positioning module receives signals, analyzes the hook's offset state, and outputs control signals. The power supply module provides power. This invention helps solve the problems of difficulty in vertical lifting during nighttime tower crane construction, the tendency for tilting during lifting, and the resulting safety hazards.

Description

Technical Field

[0001] This invention belongs to the field of tower crane positioning technology, and more specifically, relates to a vertical positioning system for a tower crane hook. Background Technology

[0002] Tower cranes, also known as "tower hoists," are used to lift construction materials such as steel bars, timber, concrete, and steel pipes. They are essential lifting equipment on construction sites, and oblique pulling or lifting is strictly prohibited during operation. Currently, due to various reasons, such as short contract periods, high pressure to meet deadlines, the need for day and night construction, traffic restrictions making daytime work unsuitable for certain procedures, and the requirement for continuous operation of large-volume concrete pouring, nighttime construction on construction sites is increasing. Since nighttime construction often results in insufficient lighting, the main solution is to install headlights on the standard sections of the tower crane to enhance nighttime illumination and ensure visibility during lifting operations.

[0003] However, installing headlights on standard sections generally results in poor lighting. Moreover, when signalmen look up at the boom and hook, the headlights create blind spots, creating a "darkness under the light" situation. This makes it difficult to observe the hook's offset when preparing to lift, and makes vertical lifting difficult during nighttime operations, increasing the risk of tilting and posing safety hazards. Summary of the Invention

[0004] In view of this, the present invention proposes a vertical positioning system for tower crane hooks, which can solve the problems of difficulty in vertical lifting of tower cranes during nighttime construction, easy occurrence of slanted lifting, and potential safety hazards.

[0005] This invention is implemented as follows:

[0006] This invention provides a vertical positioning system for a tower crane hook, comprising a camera module, a displacement measurement module, a lighting module, an alarm module, a positioning module, and a power supply module;

[0007] The shooting module is used to take continuous photos of the hook under the tower crane's moving trolley at equal intervals and transmit them to the positioning module;

[0008] The displacement measurement module is used to detect the displacement of the tower crane moving trolley and hook, and transmit it to the positioning module;

[0009] The lighting module is used to illuminate the environment below the tower crane's mobile trolley;

[0010] The alarm module is used to issue alarms;

[0011] The positioning module is used to receive signals, analyze the offset of the hook, and output control signals;

[0012] The positioning module is electrically connected to the shooting module, the displacement measurement module, the lighting module, and the alarm module, respectively; the power supply module is electrically connected to and supplies power to the shooting module, the displacement measurement module, the positioning module, the lighting module, and the alarm module, respectively.

[0013] This tower crane hook vertical positioning system uses a camera module and a displacement measurement module to detect the displacement of the hook and the tower crane trolley. The positioning module then calculates the data to obtain the relative displacement between the load and the trolley. After assessment, control commands are sent to the alarm module and the tower crane control center to issue warnings. This ensures that the relative displacement between the load and the trolley remains within a controllable range. Furthermore, using both camera and displacement measurement methods to detect the relative displacement avoids measurement errors caused by a single detection method, preventing the timely detection of tilted lifting. It also avoids injuries caused by blind spots or weather-related visual interference during tilted lifting, ensuring that the load is lifted vertically and reducing accidents during hook lifting and the lifting process.

[0014] Based on the above technical solution, the vertical positioning system for a tower crane hook of the present invention can be further improved as follows:

[0015] The positioning module specifically includes the following modules:

[0016] The image analysis module is used to analyze the image of the hook and determine the first displacement of the hook.

[0017] The calculation module is used to determine the relative displacement between the tower crane's moving trolley and the hook, which is then used as the second displacement.

[0018] The positioning module also includes a control chip, which has a built-in allowable displacement threshold.

[0019] Furthermore, it also includes a comparison module, which is used to determine whether the first displacement and the second displacement exceed the allowable displacement.

[0020] The comparison module includes a first comparator, a second comparator, and a NAND gate;

[0021] The input terminals of the first comparator are electrically connected to the positioning module and the image analysis module, respectively.

[0022] The input terminals of the second comparator are electrically connected to the positioning module and the calculation module, respectively.

[0023] The outputs of the first comparator and the second comparator are electrically connected to the input of the NAND gate, and the output of the NAND gate is electrically connected to the alarm module.

[0024] Furthermore, the positioning module performs the following steps:

[0025] The first step involves receiving the image of the hook captured by the imaging module and transmitting it to the image analysis module; and receiving the displacement signal measured by the displacement measurement module and transmitting it to the calculation module.

[0026] The second step involves the image analysis module analyzing the hook image and determining the first displacement of the hook; the calculation module then calculates the difference between the tower crane trolley displacement and the hook displacement, which is used as the second displacement.

[0027] Third step: The image analysis module sends the first displacement to the comparison module; the calculation module sends the second displacement to the comparison module.

[0028] After receiving the first displacement and the second displacement information, the comparison module determines whether the first displacement and the second displacement exceed the allowable displacement. If neither the first displacement nor the second displacement exceeds the allowable displacement, the module does not output a signal to the alarm module and the tower crane control center; otherwise, it outputs a signal to the alarm module and the tower crane control center.

[0029] Furthermore, the image analysis module performs the following steps:

[0030] Step 1: Receive the target image, establish the image coordinates of the hook, and calculate the average brightness of the target image;

[0031] The second step is to determine whether the average brightness is within the range of the first threshold and the second threshold. If yes, proceed to the next step; otherwise, change the exposure parameters and repeat the first and second steps.

[0032] The third step is to determine whether the attenuation value needs to be deducted. If yes, the first displacement is obtained by comparing the target image with the reference image; otherwise, proceed to the next step.

[0033] Step 4: Update the attenuation value and gain; subtract the updated attenuation value from the target image and amplify the attenuated target image with the gain; compare the attenuated and amplified target image with the reference image to obtain the first displacement.

[0034] Fifth step: The first displacement obtained in the third or fourth step is transmitted to the image coordinates of the hook and displayed.

[0035] The image analysis module includes an image sensor, a digital / analog unit, an adder unit, an amplifier, an analog / digital unit, and a digital signal processor;

[0036] The image sensor is used to acquire an image of the hook to form a simulated image, wherein the simulated image has an average brightness;

[0037] The digital / analog unit is used to generate the attenuation value;

[0038] The addition unit is coupled to the image sensor and the digital / analog unit, and is used to subtract the attenuation value from the analog image;

[0039] The amplifier is used to amplify the attenuated analog image and has both linear and nonlinear gains to effectively increase the surface image resolution.

[0040] The analog / digital unit is a linear or nonlinear analog / digital unit, used to digitally attenuate and amplify the analog image;

[0041] The digital signal processor is used to compare the digitized analog image with the reference image to form a displacement, and to control the digital / analog unit to generate the attenuation value.

[0042] The lighting module includes a lighting device, including a laser spotlight that shines vertically toward the ground. The laser spotlight is bolted to a spotlight mounting rod. Two parallel angle steels are respectively provided at both ends of the spotlight mounting rod. The spotlight mounting rod is welded to one end of the angle steels. A hook is provided at the other end of the angle steels. The hook is used to fix the lighting module to the tower crane moving trolley.

[0043] Furthermore, the power supply module is mounted on the lighting device and includes a solar panel for collecting solar energy, an electrical box for receiving and storing electrical energy, and a conversion device for converting solar energy into electrical energy. One end of the solar panel is bolted to the angle steel, and the other end is bolted to the conversion device mounting bracket. The conversion device is located at the bottom of the solar panel and is fixedly connected to the conversion device mounting bracket by bolts. The electrical box is fixed to the electrical box mounting bracket by bolts, and both ends of the electrical box mounting bracket are welded to the angle steel. The solar panel and the conversion device, and the conversion device and the electrical box are respectively connected by cables.

[0044] The power supply module eliminates the need for direct power from the tower crane, ensuring uninterrupted operation. Furthermore, mounting the power supply module on the tower crane's mobile trolley facilitates maintenance and inspection. During the day, the laser spotlights are switched off, storing energy through solar panels. At night, the laser spotlights automatically turn on, allowing real-time positioning of the hook and boom as the mobile trolley moves, significantly improving visibility and safety during nighttime lifting operations. The use of bolts to connect components facilitates easy assembly and disassembly, increasing material turnover.

[0045] The shooting module includes a camera installed at the bottom of the tower crane's moving trolley, with the camera shooting direction perpendicular to the hook.

[0046] The displacement measurement module includes a first displacement sensor mounted on the tower crane moving trolley for measuring the displacement of the tower crane moving trolley; and a second displacement sensor mounted on the hook for measuring the displacement of the hook.

[0047] The alarm module includes a warning light and a buzzer.

[0048] Compared with existing technologies, the advantages of the tower crane hook vertical positioning system provided by this invention are as follows: This tower crane hook vertical positioning system uses a camera module and a displacement measurement module to detect the displacement of the hook and the tower crane trolley. The positioning module then calculates the data to obtain the relative displacement between the load and the trolley. After judgment, a control command is sent to the alarm module and the tower crane control center to issue a warning, ensuring that the relative displacement between the load and the trolley is within a controllable range. Furthermore, using both camera and displacement measurement methods to detect the relative displacement between the hook and the trolley avoids measurement errors caused by a single detection method, preventing the timely detection of tilted lifting. It also avoids injuries caused by tilted lifting due to blind spots or weather-related visual interference, ensuring that the load is lifted vertically and reducing accidents during hook lifting and the lifting process. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This invention provides an architecture diagram of a vertical positioning system for a tower crane hook;

[0051] Figure 2 This invention provides a schematic diagram of a lighting device for a vertical positioning system of a tower crane hook.

[0052] The attached diagram lists the components represented by each number as follows:

[0053] 1. Solar panel; 10. Conversion device; 2. Hook; 3. Electrical box; 4. Angle steel; 5. Electrical box mounting bracket; 6. Cable; 7. Spotlight mounting pole; 8. Laser spotlight; 9. Conversion device mounting bracket. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0056] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0058] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] like Figure 1 The diagram shown is an architecture diagram of a tower crane hook vertical positioning system provided by the present invention, which specifically includes a camera module, a displacement measurement module, a lighting module, an alarm module, a positioning module, and a power supply module.

[0060] The shooting module is used to take continuous photos of the hook under the tower crane's moving trolley at equal intervals and transmit them to the positioning module;

[0061] The displacement measurement module is used to detect the displacement of the tower crane moving trolley and hook, and transmit it to the positioning module;

[0062] The lighting module is used to illuminate the environment beneath the tower crane's mobile trolley;

[0063] The alarm module is used to issue alarms;

[0064] The positioning module is used to receive signals, analyze the offset of the hook, and output control signals;

[0065] The positioning module is electrically connected to the shooting module, displacement measurement module, lighting module, and alarm module respectively; the power supply module is electrically connected to and supplies power to the shooting module, displacement measurement module, positioning module, lighting module, and alarm module respectively.

[0066] During operation, the imaging module continuously captures images of the hook below and transmits them to the positioning module. The positioning module then transmits the image information to the image analysis module, which calculates the first displacement of the hook and sends it to the comparison module. Simultaneously, the displacement measurement module detects the displacement of the tower crane trolley and the hook and transmits it to the positioning module. The positioning module transmits the displacement information to the calculation module to obtain the relative displacement of the tower crane trolley and the hook, which is then used as the second displacement and sent to the comparison module. The comparison module then compares the first and second displacements with the allowable displacements. If neither the first nor the second displacement exceeds the allowable displacement, the hook is determined to be in a vertical state, and no control signal is output to the alarm module or the tower crane control center. If at least one of the first or the second displacement exceeds the allowable displacement, the hook is determined to be in an inclined state, and a control signal is output to the alarm module and the tower crane control center.

[0067] In the above technical solution, the positioning module specifically includes the following modules:

[0068] The image analysis module is used to analyze the image of the hook and determine the first displacement of the hook.

[0069] The calculation module is used to determine the relative displacement between the tower crane's moving trolley and the hook, which is then used as the second displacement.

[0070] It should be noted that the allowable displacement depends on the height of the tower crane.

[0071] Furthermore, the above technical solution also includes a comparison module, which is used to determine whether the first displacement and the second displacement exceed the allowable displacement.

[0072] The comparison module includes a first comparator, a second comparator, and a NAND gate;

[0073] The input terminals of the first comparator are electrically connected to the positioning module and the image analysis module, respectively.

[0074] The input terminals of the second comparator are electrically connected to the positioning module and the calculation module, respectively.

[0075] The outputs of the first comparator and the second comparator are electrically connected to the input of the NAND gate, and the output of the NAND gate is electrically connected to the alarm module.

[0076] It should be noted that the comparator used is the LMV7219M5X / NOPB comparator from Yipeixincheng (Shenzhen) Electronics Technology Co., Ltd.; the input NAND gate is the CD4011BM96 four-channel 2-input NAND gate from Shenzhen Antongjie Technology Co., Ltd.

[0077] Furthermore, in the above technical solution, the positioning module performs the following steps:

[0078] The first step is to receive the image of the hook captured by the imaging module and transmit it to the image analysis module; and to receive the displacement signal measured by the displacement measurement module and transmit it to the calculation module.

[0079] The second step involves the image analysis module analyzing the hook image and determining the first displacement of the hook; the calculation module then calculates the difference between the displacement of the tower crane trolley and the hook displacement, which is used as the second displacement.

[0080] Third, the image analysis module sends the first displacement to the comparison module; the calculation module sends the second displacement to the comparison module.

[0081] Furthermore, in the above technical solution, the image analysis module performs the following steps:

[0082] The first step is to receive the target image, establish the image coordinates of the hook, and calculate the average brightness of the target image.

[0083] The second step is to determine whether the average brightness is within the range of the first and second thresholds. If yes, proceed to the next step; otherwise, change the exposure parameters and repeat the first and second steps.

[0084] The third step is to determine whether the attenuation value needs to be deducted. If so, the first displacement is obtained by comparing the target image with the reference image; otherwise, proceed to the next step.

[0085] Step 4: Update the attenuation value and gain; subtract the updated attenuation value from the target image and amplify the attenuated target image with the gain; compare the attenuated and amplified target image with the reference image to obtain the first displacement.

[0086] Fifth, the first displacement obtained in the third or fourth step will be transmitted to the image coordinates of the hook and displayed.

[0087] It should be noted that the exposure parameters refer to the luminous intensity of the illumination module;

[0088] The first threshold is 64 gray levels; the second threshold is 128 gray levels.

[0089] The reference image is the image preceding the target image obtained by the image analysis module.

[0090] like Figure 2 As shown, in the above technical solution, the lighting module includes a lighting device, including a laser spotlight 8 that shines vertically toward the ground. The laser spotlight 8 is installed on the spotlight mounting rod 7 by bolts. Angle steels 4 are provided at both ends of the spotlight mounting rod 7. The spotlight mounting rod 7 is welded to one end of the angle steel 4. A hook 2 is provided at the other end of the angle steel 4. The hook 2 is used to fix the lighting module on the tower crane moving trolley.

[0091] During nighttime hoisting operations, the laser spotlight 8 can illuminate the hoisting area below by shining vertically on the ground and provide exposure conditions for the shooting module. In addition, the staff can also use the position of the laser spotlight 8 to determine the position of the tower crane's moving trolley.

[0092] Furthermore, in the above technical solution, the power supply module is installed on the lighting device, including a solar panel 1 for collecting solar energy, an electrical box 3 for receiving and storing electrical energy, and a conversion device 10 for converting light energy into electrical energy; one end of the solar panel 1 is bolted to an angle steel 4, and the other end is bolted to a conversion device mounting frame 9; the conversion device 10 is located at the bottom of the solar panel 1 and is fixedly connected to the conversion device mounting frame 9 by bolts; the electrical box 3 is fixed to the electrical box mounting frame 5 by bolts, and both ends of the electrical box mounting frame 5 are welded to the angle steel 4 respectively; the solar panel 1 and the conversion device 10, and the conversion device 10 and the electrical box 3 are respectively connected by cables 6.

[0093] It should be noted that the conversion device 10 is a photovoltaic inverter, which can convert the variable DC voltage generated by the solar panel 1 into AC power at the mains frequency; the solar panel 1 is an XKD-100W solar panel from Xuzhou Xikaide Energy Co., Ltd.; the electrical box 3 is a 12V100AH ​​lead-acid battery from Jiangsu Huachu New Energy Technology Co., Ltd.; and the laser spotlight 8 is an SSL-TDD-001 LED tower crane light from Changzhou Shulang Engineering Lighting Co., Ltd.

[0094] In the above technical solution, the shooting module includes a camera installed at the bottom of the tower crane's moving trolley, with the camera shooting direction perpendicular to the hook.

[0095] It should be noted that the camera used is the HERO11 HD camcorder from Shenzhen Xiaofeiyi Technology Co., Ltd.

[0096] In the above technical solution, the displacement measurement module includes a first displacement sensor installed on the tower crane moving trolley for measuring the displacement of the tower crane moving trolley; and a second displacement sensor installed on the hook for measuring the displacement of the hook.

[0097] It should be noted that the first and second displacement sensors are HG-C1030 laser displacement sensors from Shenzhen Yurui Electronics Co., Ltd.

[0098] In the aforementioned technical solution, the alarm module includes a warning light and a buzzer.

[0099] Specifically, the principle of this invention is as follows: the imaging module captures image information of the hook, which is analyzed by the image analysis module in the positioning module to obtain the first displacement of the hook and sent to the comparison module; at the same time, the displacement measurement module detects the displacement of the tower crane moving trolley and the hook, and the calculation module in the positioning module calculates the relative displacement of the tower crane moving trolley and the hook as the second displacement and sends it to the comparison module; the comparison module then compares the first displacement and the second displacement with the allowable displacement respectively. When neither the first displacement nor the second displacement does not exceed the allowable displacement, the hook is determined to be in a vertical state, and no control signal is output to the alarm module and the tower crane control center; when at least one of the first displacement and the second displacement exceeds the allowable displacement, the hook is determined to be in an inclined state, and a control signal is output to the alarm module and the tower crane control center.

[0100] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A tower crane hook vertical positioning system, characterized by, The system comprises a shooting module, a displacement measurement module, an illumination module, an alarm module, a positioning module, a power supply module and a comparison module. The shooting module is configured to take pictures of the hooks at equal intervals and transmit the pictures to the positioning module. The displacement measurement module is configured to detect the displacement of the tower crane trolley and the hooks and transmit the displacement signals to the positioning module. The illumination module is configured to illuminate the environment under the tower crane trolley. The alarm module is configured to send out an alarm. The positioning module is configured to receive signals, analyze the displacement of the hooks and output control signals. The positioning module is electrically connected to the shooting module, the displacement measurement module, the illumination module and the alarm module. The positioning module comprises the following modules: An image analysis module is configured to analyze the hook images and obtain the first displacement of the hooks. A calculation module is configured to obtain the relative displacement of the tower crane trolley and the hooks as the second displacement. The positioning module performs the following steps: Step 1: The hook images taken by the shooting module are transmitted to the image analysis module, and the displacement signals measured by the displacement measurement module are transmitted to the calculation module. Step 2: The image analysis module analyzes the hook images and obtains the first displacement of the hooks, and the calculation module obtains the difference between the displacement of the tower crane trolley and the displacement of the hooks as the second displacement. Step 3: The image analysis module sends the first displacement to the comparison module, and the calculation module sends the second displacement to the comparison module. The image analysis module performs the following steps: Step 1: Receive the target image, establish the image coordinates of the hook and obtain the average brightness of the target image. Step 2: Determine whether the average brightness is within the range of the first threshold and the second threshold. If yes, proceed to the next step. If no, change the exposure parameters and repeat steps 1 and 2. Step 3: Determine whether to deduct the attenuation value. If yes, compare the target image with the reference image to obtain the first displacement. If no, proceed to the next step. Step 4: Update the attenuation value and the gain. Subtract the updated attenuation value from the target image and amplify the attenuated target image by the gain. Compare the attenuated and amplified target image with the reference image to obtain the first displacement. Step 5: Transmit the first displacement obtained in step 3 or step 4 to the image coordinates of the hook.

2. A tower crane hook height positioning system according to claim 1, characterised in that, The comparison module is configured to determine whether the first displacement and the second displacement exceed the allowed displacement. The comparison module comprises a first comparator, a second comparator and a NAND gate. The input end of the first comparator is electrically connected to the positioning module. The input end of the second comparator is electrically connected to the positioning module and the calculation module. The output ends of the first comparator and the second comparator are electrically connected to the input end of the NAND gate, and the output end of the NAND gate is electrically connected to the alarm module.

3. A tower crane hook height positioning system according to claim 1, wherein, The lighting module comprises a lighting device, the lighting device comprises a laser spotlight (8) vertically illuminating the ground, the laser spotlight (8) is bolted on a spotlight mounting rod (7), both ends of the spotlight mounting rod (7) are provided with angle steels (4) parallel to each other, one end of the spotlight mounting rod (7) is welded to the angle steel (4), the other end of the angle steel (4) is provided with a hook (2), and the hook (2) is used for fixing the lighting module on a tower crane moving trolley.

4. A tower crane hook height positioning system according to claim 3, wherein, The power supply module is arranged on the lighting device and comprises a solar panel (1) for collecting solar energy, an electric box (3) for receiving and storing electric energy and a conversion device (10) for converting light energy into electric energy; one end of the solar panel (1) is bolted with the angle steel (4), and the other end is bolted with a conversion device fixing frame (9); the conversion device (10) is located at the bottom of the solar panel (1) and is fixedly connected with the conversion device fixing frame (9) through bolts; the electric box (3) is fixed on an electric box fixing frame (5) through bolts, both ends of the electric box fixing frame (5) are welded with the angle steels (4); the solar panel (1) and the conversion device (10) and the conversion device (10) and the electric box (3) are connected through cables (6) respectively.

5. A tower crane hook height positioning system according to claim 1, wherein, The shooting module comprises a camera arranged at the bottom of the tower crane moving trolley, and the shooting direction of the camera is vertically towards the hook.

6. A tower crane hook height positioning system according to claim 1, wherein, The displacement measurement module comprises a first displacement sensor arranged on the tower crane moving trolley, which is used for measuring the displacement of the tower crane moving trolley; and a second displacement sensor arranged on the hook, which is used for measuring the displacement of the hook.

7. A tower crane hook height positioning system according to claim 1, wherein, The alarm module comprises a warning light and a buzzer.

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