A tower crane working condition detection method and detection system based on Bluetooth technology

Abstract

The present invention discloses a tower crane working condition detection method based on Bluetooth technology, which includes starting, communication connection, then tower crane state detection and early warning judgment or alarm judgment by a confirmation module, then alarm processing or early warning processing, and finally signal conversion and output. The detection system constructed according to the above tower crane working condition detection method includes a display screen, an alarm light, a buzzer, a slew sensor, a stroke sensor, a height sensor, a second Bluetooth connection module, a second decryption module and a proximity sensor switch connected to a central control unit; the slew sensor, the stroke sensor and the height sensor are all connected with a confirmation module, a constant current driver, an LED light source, a photoresistor, an electromagnetic switch, three conversion output modules, a first Bluetooth connection module and a first decryption module. The present invention can not only reduce production costs, but also has the advantages of high work efficiency, high safety in use, convenient operation, high flexibility in use and long service life.

Description

Technical Field

[0001] The invention relates to a tower crane detection technology, in particular to a tower crane working condition detection method and a detection system based on Bluetooth technology. Background Art

[0002] Tower crane is the most commonly used lifting equipment on construction sites. It mainly uses the rotating boom and luffing trolley to accurately transport components or materials to any part covered by its boom. Because the overall volume of the tower crane is large, in order to ensure the normal and safe operation of the tower crane, a safety monitoring system is generally installed on the tower crane to detect the status of each working condition of the tower crane. Because the entire safety monitoring system needs to store, detect, and judge the working conditions of each position of the tower crane, and make different feedback signals according to the results of the judgment, and the positions that need to be detected on the tower crane include the height of the tower crane hook, the rotation angle of the tower crane, the amplitude of the trolley, etc., which requires the entire safety monitoring system and when performing specific work, it needs to be supported by a control unit with more functions, and the overall production cost is high. Moreover, because there is a certain distance between the general tower crane and the main control cabinet, when transmitting information, it will require the operator, the ground command personnel and the central monitoring personnel to cooperate to avoid accidents. This transmission method requires a lot of time on information transmission, resulting in low overall work efficiency. Therefore, the existing working condition detection system for tower cranes has the problems of high production cost and low work efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a tower crane working condition detection method and detection system based on Bluetooth technology. The present invention can not only reduce production costs, but also has the advantage of high working efficiency.

[0004] The technical solution of the present invention is a tower crane working condition detection method based on Bluetooth technology, comprising the following steps:

[0005] Step 1: The tower crane action module is started according to the instruction and enters step 2; wherein the tower crane action module includes a slewing module, a lifting module and a luffing module;

[0006] Step 2: Communication connection, start the first Bluetooth connection module and the first decryption module; make the confirmation module for detecting the lifting, luffing and rotation conditions of the tower crane communicate with the central control unit for monitoring the working conditions of the tower crane; after the connection is completed, go to step 3;

[0007] Step 3: tower crane state detection, proceed to step 4; wherein the tower crane state detection is to detect the rotation state, lifting state and luffing state of the tower crane using the rotation sensor, travel sensor and height sensor installed on the tower crane and the trolley respectively;

[0008] Step 4: The confirmation module makes a warning judgment; the slewing sensor, the stroke sensor and the height sensor will respectively send the detected numerical signals of the slewing state, the lifting state and the luffing state of the tower crane to the corresponding confirmation module, and the confirmation module will make a warning comparison based on the received numerical signal and the internally set warning numerical signal; if the numerical signal is less than the warning numerical signal, the confirmation module outputs a normal signal and enters step 8; otherwise, it enters step 5;

[0009] Step 5: The confirmation module makes an alarm determination; the confirmation module makes an alarm comparison based on the received numerical signal and the internally set alarm numerical signal; if the numerical signal is less than the alarm numerical signal, the confirmation module outputs a warning signal and enters step 7; otherwise, it outputs an alarm signal and enters step 6;

[0010] Step 6: Alarm processing, the confirmation module transmits the alarm signal to the third conversion output module, and the third conversion output module converts the alarm signal into an image signal, and simultaneously sends it to the central control unit through Bluetooth communication transmission, and the central control unit performs an alarm action;

[0011] Step 7: Early warning processing, the confirmation module transmits the early warning signal to the second conversion output module, and the second conversion output module converts the early warning signal into an image signal, and simultaneously sends it to the central control unit through Bluetooth communication transmission mode, and the central control unit performs an early warning action;

[0012] Step 8: Signal conversion and output, the confirmation module transmits the normal signal to the first conversion output module, uses the first conversion output module to convert the normal signal into an image signal, and simultaneously sends it to the central control unit via Bluetooth communication transmission, and the central control unit performs normal operations.

[0013] In the aforementioned tower crane operating condition detection method based on Bluetooth technology, the alarm action in step 6 is that the central control unit synchronously controls the display screen, buzzer and alarm light to start, and at the same time controls the electromagnetic switch to disconnect, and uses the display screen to display the image of the tower crane in the alarm state, and at the same time uses the buzzer and alarm light to give an audible and visual alarm; after the electromagnetic switch is disconnected, the circuit that can control the tower crane's rotation, lifting and / or amplitude variation action is disconnected, completing the forced shutdown.

[0014] In the aforementioned tower crane operating condition detection method based on Bluetooth technology, the warning action in step 7 is that the central control unit controls the display screen to display the image of the tower crane in the alarm state, and at the same time the central control unit controls the constant current driver to output a warning current, thereby changing the current of the circuit that controls the tower crane's rotation, lifting or / and luffing action through the LED light source and the photoresistor, thereby reducing the speed of the tower crane.

[0015] In the aforementioned tower crane working condition detection method based on Bluetooth technology, the normal action in step 8 is that the central control unit controls the display screen to display a normal tower crane image.

[0016] In the above-mentioned tower crane working condition detection method based on Bluetooth technology, the confirmation module in step 4 stores the received numerical signal while determining the tower crane condition.

[0017] A detection system constructed according to the aforementioned tower crane working condition detection method based on Bluetooth technology includes a central control unit, a display screen, an alarm light, a buzzer, a rotation sensor for detecting the rotation state of the tower crane, a travel sensor for detecting the travel of the tower crane trolley, and a height sensor for detecting the height of the tower crane hook, which are communicatively connected to the central control unit; the rotation sensor, the travel sensor, and the height sensor are electrically connected to a confirmation module, and each confirmation module is electrically connected to an emergency stop device, a first conversion output module, a second conversion output module, and a third conversion output module; each first conversion output module, the second conversion output module, and the third conversion output module are electrically connected to a first Bluetooth connection module, and each first Bluetooth connection module is electrically connected to a first decryption module; the central control unit is electrically connected to a second Bluetooth connection module, and the second Bluetooth connection module is electrically connected to a second decryption module; the second decryption module is electrically connected to a proximity sensing switch; the emergency stop device includes a constant current driver communicatively connected to the central control unit, and the constant current driver is electrically connected to an LED light source; a photoresistor is provided on one side of the LED light source, and an electromagnetic switch is provided on one side of the photoresistor.

[0018] In the aforementioned detection system, the confirmation module determines whether the tower crane rotation angle, trolley stroke and tower crane hook height exceed the limit based on the data detected by the rotation sensor, stroke sensor and height sensor, thereby controlling the working status of the first conversion output module, the second conversion output module and the third conversion output module.

[0019] In the aforementioned detection system, the electromagnetic switch and the photoresistor are connected in series to the driving circuit of the tower crane.

[0020] In the aforementioned detection system, the first conversion and output module is used to convert the tower crane status information into an image signal when the confirmation module determines that it is normal, and send it to the display device via the image signal; the second conversion and output module is used to convert the tower crane status information into an image signal when the confirmation module determines that it is a warning, and send it to the display device via the image signal; the third conversion and output module is used to convert the tower crane status information into an image signal when the confirmation module determines that it is an alarm, and send it to the display device via the image signal.

[0021] In the aforementioned detection system, the display screen, the warning light and the buzzer are arranged in parallel with each other.

[0022] Compared with the prior art, the present invention sets a first Bluetooth connection module and a first decryption module. The first decryption module can realize fast and automatic Bluetooth communication between the central control unit and the confirmation module through a preset specific suffix code value, so that there is no need to manually input a password for Bluetooth pairing, which is convenient for use and improves work efficiency. The confirmation module is respectively connected to the return sensor, the stroke sensor and the height sensor, and the corresponding rotation angle, amplitude variation or lifting height of the tower crane is determined by the confirmation module alone, and the signal is transmitted through the first conversion output module, the second conversion output module or the third conversion output module according to the state determined by the confirmation module. Thus, quick judgment can be achieved and work efficiency is improved; and by setting a separate confirmation module to determine a separate state, the requirements of the entire system on the functions, models, etc. of the confirmation module, the central control unit, etc. can be reduced, thereby reducing the assembly cost of the entire system; by setting a constant current driver, an LED light source, a photoresistor and an electromagnetic switch electrically connected to each confirmation module, an automatic variable resistor controlled by the confirmation module can be formed by using the constant current driver, the LED light source and the photoresistor to achieve the effect of regulating the working current of the tower crane, thereby avoiding damage to the tower crane due to an extremely fast power outage, thereby extending the service life of the tower crane. In addition, the present invention also electrically connects the second Bluetooth connection module and the second decryption module to the central control unit, and the second decryption module is connected to a proximity sensor switch, so that the external operator can automatically control the second decryption module and the second Bluetooth connection module to start after bringing the sensor to the location of the central control unit, without manual operation, which is convenient for use; and the setting of the second Bluetooth connection module can facilitate the operator to extract the tower crane information stored in the central control unit through an external device, thereby improving the flexibility of use; using the display screen, the alarm light and the buzzer, through the display screen and the first conversion output module, the second conversion output module and the third conversion output module, the tower crane state image can be automatically displayed, which is convenient for the operator to watch; and the alarm light and the buzzer can form an audible and visual alarm device, so that the operator can get the danger signal of the tower crane in time, which is convenient for use. Therefore, the present invention can not only reduce the production cost, but also has the advantages of high work efficiency, high safety in use, convenient operation, high flexibility in use and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the connection structure between the constant current driver and the photoresistor;

[0025] Figure 3 It is a flow chart of the present invention.

[0026] The markings in the accompanying drawings are: 1-central control unit, 2-rotation sensor, 3-stroke sensor, 4-height sensor, 5-confirmation module, 6-first conversion output module, 7-second conversion output module, 8-first Bluetooth connection module, 9-first decryption module, 10-second Bluetooth connection module, 11-second decryption module, 12-proximity sensor switch, 13-constant current driver, 14-LED light source, 15-photoresistor, 16-electromagnetic switch, 17-display screen, 18-warning light, 19-buzzer. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0028] Embodiment. A tower crane working condition detection method based on Bluetooth technology, comprising: Figures 1 to 3 As shown, the following steps are included:

[0029] Step 1: The tower crane action module is started according to the instruction and enters step 2; wherein the tower crane action module includes a slewing module, a lifting module and a luffing module;

[0030] Step 2: Communication connection, start the first Bluetooth connection module and the first decryption module; make the confirmation module for detecting the lifting, luffing and rotation conditions of the tower crane communicate with the central control unit for monitoring the working conditions of the tower crane; after the connection is completed, go to step 3;

[0031] Step 3: tower crane state detection, proceed to step 4; wherein the tower crane state detection is to detect the rotation state, lifting state and luffing state of the tower crane using the rotation sensor, travel sensor and height sensor installed on the tower crane and the trolley respectively;

[0032] Step 4: The confirmation module makes a warning judgment; the slewing sensor, the stroke sensor and the height sensor will respectively send the detected numerical signals of the slewing state, the lifting state and the luffing state of the tower crane to the corresponding confirmation module, and the confirmation module will make a warning comparison based on the received numerical signal and the internally set warning numerical signal; if the numerical signal is less than the warning numerical signal, the confirmation module outputs a normal signal and enters step 8; otherwise, it enters step 5;

[0033] Step 5: The confirmation module makes an alarm determination; the confirmation module makes an alarm comparison based on the received numerical signal and the internally set alarm numerical signal; if the numerical signal is less than the alarm numerical signal, the confirmation module outputs a warning signal and enters step 7; otherwise, it outputs an alarm signal and enters step 6;

[0034] Step 6: Alarm processing, the confirmation module transmits the alarm signal to the third conversion output module, and the third conversion output module converts the alarm signal into an image signal, and simultaneously sends it to the central control unit through Bluetooth communication transmission, and the central control unit performs an alarm action;

[0035] Step 7: Early warning processing, the confirmation module transmits the early warning signal to the second conversion output module, and the second conversion output module converts the early warning signal into an image signal, and simultaneously sends it to the central control unit through Bluetooth communication transmission mode, and the central control unit performs an early warning action;

[0036] Step 8: Signal conversion and output, the confirmation module transmits the normal signal to the first conversion output module, uses the first conversion output module to convert the normal signal into an image signal, and simultaneously sends it to the central control unit via Bluetooth communication transmission, and the central control unit performs normal operations.

[0037] The alarm action in step 6 is that the central control unit synchronously controls the display screen, buzzer and alarm light to start, and controls the electromagnetic switch to be disconnected, so as to display the image of the tower crane in the alarm state using the display screen, and at the same time, sound and light alarms are given through the buzzer and alarm light; after the electromagnetic switch is disconnected, the circuit that can control the rotation, lifting or / and luffing action of the tower crane is disconnected, and the forced shutdown is completed; the early warning action in step 7 is that the central control unit controls the display screen to display the image of the tower crane in the alarm state, and at the same time, the central control unit controls the constant current driver to output the early warning current, thereby changing the current of the circuit that controls the rotation, lifting or / and luffing action of the tower crane through the LED light source and the photoresistor, and reducing the speed of the tower crane; the normal action in step 8 is that the central control unit controls the display screen to display the normal image of the tower crane; in step 4, the confirmation module will store the received numerical signal while determining the condition of the tower crane.

[0038] The detection system constructed according to the above-mentioned tower crane working condition detection method based on Bluetooth technology includes a central control unit 1, a display screen 17, an alarm light 18, a buzzer 19, a rotation sensor 2 for detecting the rotation state of the tower crane, a travel sensor 3 for detecting the travel of the tower crane trolley, and a height sensor 4 for detecting the height of the tower crane hook; the rotation sensor 2, the travel sensor 3 and the height sensor 4 are all electrically connected to a confirmation module 5, and each confirmation module 5 is electrically connected to an emergency stop device, a first conversion output module 6, a second conversion output module 7 and a third conversion output module Output module; each of the first conversion output module 6, the second conversion output module 7 and the third conversion output module is electrically connected to a first Bluetooth connection module 8, and each of the first Bluetooth connection module 8 is electrically connected to a first decryption module 9; the central control unit 1 is electrically connected to a second Bluetooth connection module 10, and the second Bluetooth connection module 10 is electrically connected to a second decryption module 11; the second decryption module 11 is electrically connected to a proximity sensing switch 12; the emergency stop device includes a constant current driver 13 that is communicatively connected to the central control unit 1, and the constant current driver 13 is electrically connected to an LED light source 14; a photoresistor 15 is provided on one side of the LED light source 14, and an electromagnetic switch 16 is provided on one side of the photoresistor 15.

[0039] The confirmation module 5 determines whether the tower crane rotation angle, trolley stroke and tower crane hook height are beyond the limit according to the data detected by the rotation sensor 2, the stroke sensor 3 and the height sensor 4, so as to control the working states of the first conversion output module 6, the second conversion output module 7 and the third conversion output module; the electromagnetic switch 16 and the photoresistor 15 are connected in series to the drive circuit of the tower crane; the first conversion output module 6 is used to convert the tower crane status information into an image signal when the confirmation module 5 determines that it is normal, and send it to the display device via the image signal; the second conversion output module 7 is used to convert the tower crane status information into an image signal when the confirmation module 5 determines that it is a warning, and send it to the display device via the image signal; the third conversion output module is used to convert the tower crane status information into an image signal when the confirmation module 5 determines that it is an alarm, and send it to the display device via the image signal; the display screen 17, the alarm light 18 and the buzzer 19 are arranged in parallel with each other.

[0040] Working principle: When carrying out specific work, first connect the entire system to the external safe mains, so that the central control unit 1, the rotation sensor 2, the stroke sensor 3, the height sensor 4, the confirmation module 5, the first Bluetooth connection module 8 and the first decryption module 9 are powered on and started; after the first Bluetooth connection module 8 and the first decryption module 9 are started, the first Bluetooth connection module 8 will send a connection signal to the central control unit 1 through the first decryption module 9; and because of the specific suffix code value set inside the first decryption module 9, the first Bluetooth connection module 8 can directly complete the Bluetooth connection with the central control unit 1 without entering a password, etc., thereby facilitating operation; and the rotation sensor 2, the stroke sensor After the height sensor 3 and the height sensor 4 are started, they will automatically detect the rotation angle of the tower crane, the travel amplitude of the trolley and the height of the tower crane hook, and send the detected numerical signal to the corresponding confirmation module 5. After receiving the corresponding numerical signal, the confirmation module 5 will store the numerical signal, and at the same time extract the internally set early warning value and alarm value, and compare the numerical signal with the early warning value and the alarm value respectively. When the detected numerical signal does not exceed the early warning value, the confirmation module 5 will send a normal signal to the first conversion output module 6, and the first conversion output module 6 will convert the normal signal into an image signal and send it to the central control unit 1. The central control unit 1 will receive the first conversion output The image signal sent by the module 6 will be displayed on the display screen 17 for easy observation by the operator; and when the detected numerical signal exceeds the warning value but does not exceed the alarm value, the confirmation module 5 will send a warning signal to the second conversion output module 7, and the second conversion output module 7 will also convert the warning signal into an image signal and send it to the central control unit 1, and it will be displayed on the display screen 17; at the same time, the confirmation module 5 controls the current output by the constant current driver 13, thereby changing the brightness of the light generated by the LED light source 14. When the brightness of the LED light source 14 changes, the brightness irradiated on the photoresistor 15 will change, so that the overall resistance of the photoresistor 15 will change. Change, so as to adjust the power-on current of the corresponding tower crane's rotary motor, trolley or motor controlling the lifting of the tower crane hook, so as to slow down or slowly pause its overall action; when the detected numerical signal exceeds the alarm value, the confirmation module 5 will send an alarm signal to the second conversion output module 7, and the second conversion output module 7 will also convert the alarm signal into an image signal and send it to the central control unit 1, and the central control unit 1 will display the alarm signal through the display screen 17, and at the same time, the central control unit 1 will also control the alarm light 18 and the buzzer 19 to start, and the alarm light 18 and the buzzer 19 can form an audible and visual alarm signal, so as to play the role of the alarm reminder signal to the greatest extent;At the same time, the confirmation module 5 will directly control the electromagnetic switch 16 to disconnect, so that the corresponding working position on the tower crane is powered off and stops working, avoiding the occurrence of dangerous phenomena caused by the operator's untimely handling, and improving the safety of use; when an outsider wants to check the working status of the tower crane through an external device, he only needs to move the corresponding device with a sensor to the vicinity of the central control unit 1, and then the proximity sensor switch 12 will be closed, so that the second decryption module 11 and the second Bluetooth connection module 10 are started, so that the central control unit 1 can automatically connect to the external device with Bluetooth, which not only facilitates the operation, but also improves the flexibility of the overall monitoring system. ;

Claims

1. A tower crane working condition detection method based on Bluetooth technology, characterized in that: The steps include: Step 1: The tower crane action module is started according to the instruction and enters step 2; wherein the tower crane action module includes a slewing module, a lifting module and a luffing module; Step 2: Communication connection, start the first Bluetooth connection module and the first decryption module; make the confirmation module for detecting the lifting, luffing and rotation conditions of the tower crane communicate with the central control unit for monitoring the working conditions of the tower crane; after the connection is completed, go to step 3; Step 3: tower crane state detection, proceed to step 4; wherein the tower crane state detection is to detect the rotation state, lifting state and luffing state of the tower crane using the rotation sensor, travel sensor and height sensor installed on the tower crane and the trolley respectively; Step 4: The confirmation module makes a warning judgment; the slewing sensor, the stroke sensor and the height sensor will respectively send the detected numerical signals of the slewing state, the lifting state and the luffing state of the tower crane to the corresponding confirmation module, and the confirmation module will make a warning comparison based on the received numerical signal and the internally set warning numerical signal; if the numerical signal is less than the warning numerical signal, the confirmation module outputs a normal signal and enters step 8; otherwise, it enters step 5; Step 5: The confirmation module makes an alarm determination; the confirmation module makes an alarm comparison based on the received numerical signal and the internally set alarm numerical signal; if the numerical signal is less than the alarm numerical signal, the confirmation module outputs a warning signal and enters step 7; otherwise, it outputs an alarm signal and enters step 6; Step 6: Alarm processing, the confirmation module transmits the alarm signal to the third conversion output module, and the third conversion output module converts the alarm signal into an image signal, and simultaneously sends it to the central control unit through Bluetooth communication transmission, and the central control unit performs an alarm action; Step 7: Early warning processing, the confirmation module transmits the early warning signal to the second conversion output module, and the second conversion output module converts the early warning signal into an image signal, and simultaneously sends it to the central control unit through Bluetooth communication transmission mode, and the central control unit performs an early warning action; Step 8: signal conversion and output, the confirmation module transmits the normal signal to the first conversion output module, the first conversion output module converts the normal signal into an image signal, and simultaneously sends it to the central control unit via Bluetooth communication transmission, and the central control unit performs normal operations; The alarm action in step 6 is that the central control unit synchronously controls the display screen, buzzer and alarm light to start, and controls the electromagnetic switch to disconnect, and uses the display screen to display the image of the tower crane in the alarm state, and at the same time, the buzzer and the alarm light are used to sound and light alarm; after the electromagnetic switch is disconnected, the circuit that can control the rotation, lifting and / or luffing action of the tower crane is disconnected, and the forced shutdown is completed; The early warning action in step 7 is that the central control unit controls the display screen to display the image of the tower crane in the alarm state, and at the same time the central control unit controls the constant current driver to output the early warning current, thereby changing the current of the circuit controlling the rotation, lifting and / or luffing action of the tower crane through the LED light source and the photoresistor, thereby reducing the speed of the tower crane operation; The normal action in step 8 is that the central control unit controls the display screen to display a normal tower crane image; In step 4, the confirmation module stores the received numerical signal while determining the condition of the tower crane; The central control unit is electrically connected to a second Bluetooth connection module and a second decryption module, and the second decryption module is connected to a proximity sensing switch, so that an external operator can automatically control the second decryption module and the second Bluetooth connection module to start up when bringing the sensing element close to the location of the central control unit, without the need for manual operation, thus facilitating use; and the setting of the second Bluetooth connection module can facilitate the operator to extract the tower crane information stored in the central control unit through an external device, thereby improving the flexibility of use.

2. A detection system constructed according to the tower crane working condition detection method based on Bluetooth technology as described in claim 1, characterized in that: The invention comprises a central control unit (1), the central control unit (1) being communicatively connected with a display screen (17), an alarm light (18), a buzzer (19), a slew sensor (2) for detecting the slew state of a tower crane, a travel sensor (3) for detecting the travel of a tower crane trolley, and a height sensor (4) for detecting the height of a tower crane hook; the slew sensor (2), the travel sensor (3), and the height sensor (4) are all electrically connected with a confirmation module (5); each confirmation module (5) is electrically connected with an emergency stop device, a first conversion output module (6), a second conversion output module (7), and a third conversion output module; each first conversion output module (6), the second conversion output module (7) and the third conversion output module are all electrically connected to the first Bluetooth connection module (8), and each first Bluetooth connection module (8) is electrically connected to the first decryption module (9); the central control unit (1) is electrically connected to the second Bluetooth connection module (10), and the second Bluetooth connection module (10) is electrically connected to the second decryption module (11); the second decryption module (11) is electrically connected to the proximity sensor switch (12); the emergency stop device comprises a constant current driver (13) which is communicatively connected to the central control unit (1), and the constant current driver (13) is electrically connected to the LED light source (14); a photoresistor (15) is arranged on one side of the LED light source (14), and an electromagnetic switch (16) is arranged on one side of the photoresistor (15).

3. The detection system according to claim 2, characterized in that: The confirmation module (5) determines whether the tower crane rotation angle, trolley travel and tower crane hook height exceed the limit according to the data detected by the rotation sensor (2), the travel sensor (3) and the height sensor (4), thereby controlling the working states of the first conversion output module (6), the second conversion output module (7) and the third conversion output module.

4. The detection system according to claim 2, characterized in that: The electromagnetic switch (16) and the photoresistor (15) are connected in series to a drive circuit of the tower crane.

5. The detection system according to claim 2, characterized in that: The first conversion and output module (6) is used to convert the tower crane status information into an image signal when the confirmation module (5) determines that the situation is normal, and send the image signal to the display device; the second conversion and output module (7) is used to convert the tower crane status information into an image signal when the confirmation module (5) determines that the situation is early warning, and send the image signal to the display device; the third conversion and output module is used to convert the tower crane status information into an image signal when the confirmation module (5) determines that the situation is alarming, and send the image signal to the display device.

6. The detection system according to claim 2, characterized in that: The display screen (17), the warning light (18) and the buzzer (19) are arranged in parallel with each other.

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