Climbing operation alarm device based on reference plane and alarm method thereof

Abstract

The invention discloses a climbing operation alarm device based on a reference plane and an alarm method thereof, and belongs to the field of climbing operation protection. The climbing operation alarm device comprises a safety belt, a safety rope, a hook and a safety helmet; the safety belt comprises a belt body and a plurality of first pressure sensors; the first pressure sensor is mounted on the belt body; the hook is connected with a safety belt through a safety rope; a second pressure sensor is further arranged on the hook; the safety helmet comprises a helmet body and an alarm unit. The alarm unit is arranged on the helmet body and comprises a controller, a calibration button, a distance measuring module and an alarm module; a calibration module is also arranged in the controller; the controller is electrically connected with the distance measuring module, the alarm module, the second pressure sensor and the first pressure sensors and used for comprehensively judging whether to control the alarm module to give an alarm or not according to the received two pressure signals and height signals. The alarm judgment accuracy can be improved, false alarm and missing alarm are prevented, and the practicability is high.

Description

Technical Field

[0001] This invention belongs to the field of height operation protection, specifically relating to a height operation alarm device and alarm method based on a reference plane. Background Technology

[0002] In the fields of construction, power, and chemical industry, high-rise buildings and large equipment often require maintenance, which necessitates workers to perform high-altitude operations. The height of these operations is mostly concentrated in the range of 2 to 30 meters, covering various forms such as ladder climbing inspection, platform edge operation, and tower crane maintenance.

[0003] In traditional high-altitude operations, workers typically wear specialized protective equipment such as safety belts and helmets. However, in these operations, improper use of protective equipment can lead to safety belts or helmets coming loose, causing protective failure and potentially resulting in falls. Furthermore, high-altitude operations require workers to constantly change positions for various specialized tasks. Even if initially wearing the equipment correctly, these changes in posture can cause the safety belt to lose its effective restraint, posing a safety hazard.

[0004] To ensure the safety of workers, current protective equipment has been improved, adding monitoring instruments and alarms to safety belts and helmets to promptly remind workers whether they are properly equipped. However, such monitoring and alarm devices often have simple alarm logic, triggering alarms based solely on whether equipment is worn. Their detection dimensions are singular, failing to consider the complexities of actual operations. For example, relying solely on pressure sensors to detect equipment wear may result in false alarms while workers are putting it on. Furthermore, because workers alternate between various platforms at different heights, and the height-detecting instruments are not calibrated, inaccurate judgments of the actual height climbed can lead to false or missed alarms. In addition, these devices lack categorized alarm systems, making it difficult for workers to quickly identify the cause of alarms and take prompt action, thus failing to meet the safety management needs of various height-based operations. Therefore, there is an urgent need for a height-based operation alarm device and its alarm method that can solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing a height-based alarm device and method for work on a reference plane. This aims to solve the problems of current protective equipment having simple alarm logic, making it difficult to adapt to complex height-based work environments, and easily leading to false alarms or missed alarms due to inaccurate judgment. To achieve the above objective, this invention provides the following technical solution: A height-advancing work alarm device based on a reference plane includes a safety belt, a safety rope, a hook, and a safety helmet. The safety belt includes a belt body and several first pressure sensors. The first pressure sensors are mounted on the belt body and are used to detect the pressure exerted by the belt body on the worker wearing the belt in real time. The hook is connected to the safety belt via a safety rope. The hook is also equipped with a second pressure sensor, which is used to detect the pressure on the hook in real time. The safety helmet includes a helmet body and an alarm unit. The alarm unit is located on the helmet body and includes a controller, a calibration button, a distance measuring module, and an alarm module. The controller has a built-in calibration module, which is used to calibrate the height of the reference plane where the height-advancing work is located when the calibration button is triggered. The distance measuring module is used to detect the height of the worker relative to the reference plane when climbing. The controller is electrically connected to the distance measuring module, the alarm module, the second pressure sensor, and several first pressure sensors, and is used to comprehensively determine whether to control the alarm module to sound an alarm based on the received two pressure signals and height signals.

[0006] Furthermore, the belt body includes a waist belt, cross shoulder straps, two shoulder straps, and two leg straps; the two leg straps are symmetrically connected to the lower part of the waist belt, and the two shoulder straps are symmetrically connected to the upper part of the waist belt; a buckle is provided on the front side of the waist belt; the cross shoulder straps are located behind the shoulder straps and are connected between the two shoulder straps.

[0007] Furthermore, there are five first pressure sensors; the five first pressure sensors are respectively located at the top of the shoulder strap, the center of the cross strap, and the bottom of the leg strap; the strap body is also provided with a first battery; the first battery is connected to the five first pressure sensors respectively through wires.

[0008] Furthermore, the ranging module is located on the top of the hat body; the alarm module and calibration button are symmetrically located on the left and right sides of the hat body; the controller is located on the rear side inside the hat body; the ranging module, alarm module and calibration button are all electrically connected to the controller via wires.

[0009] Furthermore, the controller is installed on the rear side inside the cap body; the controller contains a second battery, and the second battery is electrically connected to the controller; both the first pressure sensor and the second pressure sensor are electrically connected to the controller wirelessly.

[0010] Furthermore, the ranging module is a laser ranging sensor.

[0011] Furthermore, the alarm module is a buzzer.

[0012] A method for alarming work at height based on a reference plane, employing the aforementioned alarm device for work at height, includes the following steps: Calibration steps: Place the safety helmet on the reference plane where the work will be carried out; press and hold the calibration button on the helmet to trigger calibration, and then the controller will reset the current detection value of the ranging module to zero; Detection steps: Preset detection cycle; After the operator puts on a safety belt and a safety helmet, he / she performs high-altitude work. At this time, the controller re-acquires the pressure signals P1 of the first pressure sensor, the pressure signal P2 of the second pressure sensor and the height signal H of the ranging module in each detection cycle. Judgment steps: Preset lower limit height h1, safe height h2, and safe pressure value p; comprehensively judge the values ​​of several pressure signals P1, pressure signal P2, and height signal H obtained in each detection cycle; if H is less than h1, exit the judgment step; otherwise, enter the alarm step. Alarm procedure: Based on the feedback values ​​of several pressure signals P1, P2 and height signal H, control the alarm module to perform a level 1 alarm, level 2 alarm, level 3 alarm or level 4 alarm.

[0013] Furthermore, the alarm procedure specifically includes: B1: Preset h1=1.6m, h2=2m, p=10N; B2: Determine if the value of H is greater than the value of h2; if yes, proceed to step B4; otherwise, proceed to step B3. B3: When the value of P2 is greater than 10N, but the value of one or more of P1 is less than 10N, the alarm module is controlled to perform a level 1 alarm; when the value of all P1 is greater than 10N, but the value of P2 is less than 10N, the alarm module is controlled to perform a level 2 alarm; if the value of any P1 and P2 is greater than 10N, the alarm module is controlled to perform a level 3 alarm. B4: When the value of any P1 or P2 is greater than 10N, the alarm module will trigger a level four alarm.

[0014] Furthermore, when the alarm module executes an alarm of any level, if H is between h1 and h2 and all values ​​of P1 and P2 are greater than p, or if H is less than h1, the alarm will automatically stop.

[0015] The beneficial effects of this invention are: 1. This invention ensures accurate height detection by calibrating the reference plane, thereby improving the accuracy of risk assessment and meeting the alarm requirements of different work platform climbing scenarios; and by comprehensively evaluating the pressure signals of the safety belt and hook and the height of the worker from the reference plane, it determines whether the worker is really in a risky state and triggers an alarm, avoiding false alarms or missed alarms.

[0016] 2. This invention uses tiered alarms to enable operators to quickly locate abnormal areas and conduct timely investigations based on differences in alarm characteristics, further shortening response time. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the safety belt, safety rope, and hook in this invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the safety helmet in this invention. Figure 1 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the safety helmet in this invention. Figure 2 ; Figure 4 This is a schematic diagram of the three-dimensional structure of the safety helmet in this invention. Figure 3 ; In the attached diagram: 1-Safety belt, 2-Safety rope, 3-Hook, 4-Safety helmet, 5-First pressure sensor, 6-Second pressure sensor, 7-Controller, 11-Belt body, 41-Helmet body, 42-Calibration button, 43-Distance measuring module, 44-Alarm module, 111-Waist belt, 112-Cross shoulder straps, 113-Shoulder straps, 114-Leg straps, 115-Buckle. Detailed Implementation

[0018] 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," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.

[0019] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0020] In the description of this invention, "a plurality of" means two or more.

[0021] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0022] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0023] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0025] Example 1: See attached Figures 1-4This embodiment provides a height-based work alarm device based on a reference plane, including a safety belt 1, a safety rope 2, a hook 3, and a safety helmet 4; the safety belt 1 includes a belt body 11 and several first pressure sensors 5; the first pressure sensors 5 are mounted on the belt body 11 and are used to detect the pressure exerted by the belt body 11 on the worker wearing the belt body 11 in real time; the hook 3 is connected to the safety belt 1 via the safety rope 2; the hook 3 is also equipped with a second pressure sensor 6; the second pressure sensor 6 is used to detect the pressure on the hook 3 in real time; the safety helmet 4 includes a helmet body 41 and an alarm unit; the alarm unit... The helmet 41 is equipped with a controller 7, a calibration button 42, a distance measuring module 43, and an alarm module 44. The controller 7 has a built-in calibration module, which calibrates the height of the reference plane for the work at height when the calibration button 42 is triggered. The distance measuring module 43 detects the height of the worker relative to the reference plane during the work. The controller 7 is electrically connected to the distance measuring module 43, the alarm module 44, the second pressure sensor 6, and several first pressure sensors 5, and determines whether to activate the alarm module 44 based on the received pressure and height signals. As can be seen from the above structure, the present invention sets first pressure sensors 5 on the belt 11, second pressure sensors 6 on the hook 3, and a calibration button 42 and a distance measuring module 43 on the helmet 4 to detect pressure and height respectively. Firstly, the first pressure sensors 5 are distributed throughout the belt 11, allowing the worker to detect the pressure on various parts of the belt 11 after wearing it, and transmit the first pressure signal to the controller 7 via wired or wireless means. Secondly, the second pressure sensor 6 on the hook 3 can detect the pressure on the hook 3 in real time and transmit the corresponding second pressure signal to the controller 7 via wired or wireless means. This allows the controller 7 to acquire the pressure signals of the harness 11 and the hook 3 in real time during the climbing operation and determine if there is any abnormality in wearing the helmet. The safety helmet 4 needs to be placed on the ground before the operation. By triggering the calibration button 42, the controller 7, which has a calibration module, calibrates the height of the reference plane where the climbing operation is located, ensuring the accuracy of the distance measuring module 43. The specific calibration control logic is existing technology and will not be described here. Then, the worker wears the calibrated safety helmet 4 to perform the climbing operation. At the same time, the distance measuring module 43 detects the worker's actual height relative to the reference plane to monitor whether the worker is within a safe climbing range. The controller 7 is also electrically connected to the alarm module 44. The controller 7 has preset pressure and height values. During the climbing operation, it compares the acquired first pressure signal, second pressure signal, and height signal with the preset pressure and height values ​​to comprehensively determine whether to trigger the alarm module 44.

[0026] For example, the preset lower limit for height is 1.6m, the safe height is 2m, and the pressure value is 10N. If the detected working height is below 1.6m, but the pressure values ​​on the belt 11 and hook 3 are both less than 10N, this may indicate that the worker is wearing the equipment on the ground. Therefore, even if the pressure values ​​on the belt 11 and hook 3 are low, no alarm will be triggered. Conversely, if the detected working height is greater than 2m, but the pressure values ​​on the belt 11 and / or hook 3 are less than 10N, an alarm will be triggered. The upper limit for height can be set according to the required engineering height of the work platform. Therefore, this invention can calibrate the height based on the reference horizontal plane of the platform where the work is being carried out, and can comprehensively determine whether to trigger an alarm based on the height and pressure values ​​of the work. This ensures the accuracy of height detection in different platform scenarios, prevents false alarms from low-altitude wear, and avoids false alarms or missed alarms caused by the failure to calibrate the reference plane height during high-altitude work. It can adapt to different high-altitude work scenarios.

[0027] Example 2: See attached Figures 1-4 Based on Embodiment 1, the belt body 11 includes a waist belt 111, cross shoulder straps 112, two shoulder straps 113, and two leg straps 114. The two leg straps 114 are symmetrically connected to the lower part of the waist belt 111, and the two shoulder straps 113 are symmetrically connected to the upper part of the waist belt 111. The waist belt 111 has a buckle 115 on the front side. The cross shoulder straps 112 are located behind the shoulder straps 113 and are connected between the two shoulder straps 113. As can be seen from the above structure, the belt body 11 adopts a structured design that conforms to the human wearing habits. Specifically, it is composed of a waist belt 111, cross shoulder straps 112, two shoulder straps 113, and two leg straps 114. When wearing it, you can first open the buckle 115 on the front side of the waist belt 111, then put your two feet into the two leg straps 114, then put the two shoulder straps 113 on your shoulders, and finally fasten the buckle 115 to complete the wearing.

[0028] Five pressure sensors 5 are provided; these five pressure sensors 5 are respectively located at the top of the shoulder strap 113, the center of the cross-back strap 112, and the bottom of the leg strap 114; a first battery is also provided on the belt body 11; the first battery is connected to each of the five pressure sensors 5 via wires. As can be seen from the above structure, the five pressure sensors 5 on the belt body 11 can monitor key areas of the shoulder, back, and legs in real time, and the belt body 11 is also equipped with a first battery to power the pressure sensors 5. Specifically, the first battery can be a lithium battery and is detachably installed on the belt body 11 for easy replacement.

[0029] The ranging module 43 is located on the top of the helmet body 41; the alarm module 44 and calibration button 42 are symmetrically located on the left and right sides of the helmet body 41; the controller 7 is located on the rear side inside the helmet body 41; the ranging module 43, alarm module 44, and calibration button 42 are all electrically connected to the controller 7 via wires. As can be seen from the above structure, the ranging module 43 is mounted on the top of the helmet body 41, using the top of the helmet body 41 as the detection base point to ensure the accuracy of the height data. The alarm module 44 and calibration button 42 are symmetrically located on the left and right sides of the helmet body, ensuring that the alarm module 44 is positioned close to the ear when the worker is wearing the safety helmet 4, allowing the worker to clearly hear the alarm sound. The calibration button 42 is located on the other side of the helmet body 41, allowing the worker to calibrate the reference height of the ranging module 43 by pressing the calibration button 42.

[0030] The controller 7 is installed inside the rear side of the helmet body 41; the controller 7 contains a second battery, which is electrically connected to the controller 7; the first pressure sensor 5 and the second pressure sensor 6 are both electrically connected to the controller 7 wirelessly. As can be seen from the above structure, the controller 4 is located inside the rear side of the helmet body 41, saving installation space and making the helmet 4 more compact. The controller 7 also contains a second battery to power it; specifically, the second battery can also be a lithium battery. Furthermore, the first pressure sensor 5 and the second pressure sensor 6 can both be electrically connected to the controller 7 wirelessly, allowing the safety belt 1 and the helmet 4 to move freely respectively.

[0031] The ranging module 43 is a laser ranging sensor. As can be seen from the above structure, the ranging module 43 can be a laser ranging sensor, which can quickly and accurately measure the vertical distance between the operator and the reference plane.

[0032] The alarm module 44 is a buzzer. As can be seen from the above structure, when an alarm is needed, the controller 7 controls the buzzer to emit a clear and loud alarm sound. Because the buzzer is installed on the side of the cap 41, it allows operators to hear the alarm immediately and react and handle it promptly. The buzzer model can be adapted to meet specific needs, emitting sounds with different intervals and volumes.

[0033] Example 3: See attached Figures 1-4 This embodiment provides a method for alarming work at heights based on a reference plane, applied to the alarm device for work at heights as described in Embodiment 1 or Embodiment 2, and includes the following steps: Calibration steps: Place the safety helmet 4 on the reference plane to be worked on; press and hold the calibration button 42 on the helmet body 41 to trigger calibration, and then the controller 7 will reset the current detection value of the ranging module 43 to zero; Detection steps: Preset detection cycle; After the operator wears safety belt 1 and safety helmet 4, he / she performs high-altitude work. At this time, the controller 7 re-acquires several pressure signals P1 from the first pressure sensor 5, pressure signals P2 from the second pressure sensor 6, and height signals H from the ranging module 43 in each detection cycle. Judgment steps: Preset lower limit height h1, safe height h2, and safe pressure value p; comprehensively judge the values ​​of several pressure signals P1, pressure signal P2, and height signal H obtained in each detection cycle; if H is less than h1, exit the judgment step; otherwise, enter the alarm step. Alarm procedure: Based on the feedback values ​​of several pressure signals P1, P2 and height signal H, control the alarm module 44 to perform a level 1 alarm, level 2 alarm, level 3 alarm or level 4 alarm.

[0034] As described above, this invention uses the plane where the work platform is located as the reference plane, and comprehensively judges the actual situation of the worker climbing height by acquiring the pressure value P1 of the first pressure sensor, the pressure value P2 of the second pressure sensor at the hook, and the height value H of the laser rangefinder. This prevents the alarm module 44 from issuing false alarms when the worker is wearing protective gear on the ground or at low altitudes. Furthermore, this invention classifies alarms into four levels so that workers can clearly and quickly understand where the protective equipment is malfunctioning, and can react and troubleshoot rapidly, significantly reducing response time.

[0035] Example 4: See attached Figures 1-4 Based on Example 3, the alarm step is specifically as follows: B1: Preset h1=1.6m, h2=2m, p=10N; B2: Determine if the value of H is greater than the value of h2; if yes, proceed to step B4; otherwise, proceed to step B3. B3: When the value of P2 is greater than 10N, but the value of one or more of P1 is less than 10N, the alarm module 44 is controlled to perform a level 1 alarm; when the value of all P1 is greater than 10N, but the value of P2 is less than 10N, the alarm module 44 is controlled to perform a level 2 alarm; if the value of any P1 and P2 is greater than 10N, the alarm module 44 is controlled to perform a level 3 alarm. B4: When the value of any P1 or P2 is greater than 10N, the alarm module 44 will trigger a level four alarm.

[0036] When alarm module 44 executes any level of alarm, if H is between h1 and h2 and all values ​​of P1 and P2 are greater than p, or if H is less than h1, the alarm will automatically stop.

[0037] As can be seen from the above, to prevent false alarms during wear, the lower height limit can be flexibly adjusted according to the height of the worker. For example, in this embodiment, the lower height limit h1 is set to 1.6m, representing a worker's height of approximately 1.6m. This setting can prevent workers from triggering false alarms of the alarm module 44 while wearing the equipment. According to relevant regulations for high-altitude operations, the safe height value h2 is set to 2m, and the safe pressure value is set to 10N. The alarm module 44 can specifically use a buzzer, which can be controlled to emit cyclical alarms with different intervals and volumes according to different alarm levels (levels one to four). This allows workers to quickly locate abnormal parts of the protective equipment and troubleshoot them promptly by observing the differences in alarm characteristics.

[0038] Furthermore, if the lower height limit h1 is not reached, it is determined that the worker may be on the ground, and the alarm procedure is immediately terminated. When a level four high-risk alarm is triggered, other auxiliary personnel can quickly coordinate to evacuate the worker to the ground in a timely manner, preventing falls due to continued unsafe work at height and ensuring operational safety. The buzzer will automatically stop sounding when the worker quickly adjusts to eliminate the fall risk or returns to the ground.

[0039] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A height-based work alarm device based on a reference plane, characterized in that: The system includes a safety belt (1), a safety rope (2), a hook (3), and a safety helmet (4); the safety belt (1) includes a belt body (11) and several first pressure sensors (5); the first pressure sensors (5) are installed on the belt body (11) and are used to detect the pressure exerted by the belt body (11) on the worker wearing the belt body (11) in real time; the hook (3) is connected to the safety belt (1) through the safety rope (2); the hook (3) is also provided with a second pressure sensor (6); the second pressure sensor (6) is used to detect the pressure on the hook (3) in real time; the safety helmet (4) includes a helmet body (41) and an alarm unit; the alarm unit is located on the helmet body (41). 1) The system includes a controller (7), a calibration button (42), a distance measuring module (43), and an alarm module (44). The controller (7) has a built-in calibration module, which is used to calibrate the height of the reference plane where the climbing operation is located when the calibration button (42) is triggered. The distance measuring module (43) is used to detect the height of the worker relative to the reference plane when climbing. The controller (7) is electrically connected to the distance measuring module (43), the alarm module (44), the second pressure sensor (6), and several first pressure sensors (5) respectively, and is used to comprehensively determine whether to control the alarm module (44) to sound an alarm based on the two pressure signals and the height signal received.

2. The alarm device for working at height according to claim 1, characterized in that: The belt body (11) includes a waist belt (111), a cross back strap (112), two shoulder straps (113) and two leg straps (114); the two leg straps (114) are symmetrically connected to the lower part of the waist belt (111), and the two shoulder straps (113) are symmetrically connected to the upper part of the waist belt (111); the waist belt (111) has a buckle (115) on the front side; the cross back strap (112) is located behind the shoulder straps (113) and is connected between the two shoulder straps (113).

3. The alarm device for working at heights according to claim 2, characterized in that: There are five first pressure sensors (5); the five first pressure sensors (5) are respectively located at the top of the shoulder strap (113), the center of the cross back strap (112) and the bottom of the leg strap (114); the belt body (11) is also provided with a first battery; the first battery is connected to the five first pressure sensors (5) respectively through wires.

4. The alarm device for working at height according to claim 1, characterized in that: The ranging module (43) is located on the top outside the cap (41); the alarm module (44) and the calibration button (42) are symmetrically located on the left and right sides outside the cap (41); the controller (7) is located on the rear side inside the cap (41); the ranging module (43), the alarm module (44) and the calibration button (42) are all electrically connected to the controller (7) through wires.

5. The alarm device for working at heights according to claim 4, characterized in that: The controller (7) is installed inside the rear side of the cap body (41); the controller (7) is equipped with a second battery and is electrically connected to the controller (7); the first pressure sensor (5) and the second pressure sensor (6) are both electrically connected to the controller (7) wirelessly.

6. The alarm device for working at heights according to claim 4, characterized in that: The ranging module (43) is a laser ranging sensor.

7. The alarm device for working at height according to claim 6, characterized in that: The alarm module (44) is a buzzer.

8. A method for alarming high-altitude operations based on a reference plane, characterized in that, The alarm device for working at heights as described in any one of claims 1 to 7 is characterized by comprising the following steps: Calibration steps: Place the safety helmet (4) on the reference plane to be worked on; press and hold the calibration button (42) on the helmet body (41) to trigger calibration, and then the controller (7) will reset the current detection value of the ranging module (43) to zero; Detection steps: Preset detection cycle; After the operator wears a safety belt (1) and a safety helmet (4), he / she performs high-altitude work. At this time, the controller (7) re-acquires the pressure signal P1 of the first pressure sensor (5), the pressure signal P2 of the second pressure sensor (6) and the height signal H of the ranging module (43) in each detection cycle. Judgment steps: Preset lower limit height h1, safe height h2, and safe pressure value p; comprehensively judge the values ​​of several pressure signals P1, pressure signal P2, and height signal H obtained in each detection cycle; if H is less than h1, exit the judgment step; otherwise, enter the alarm step. Alarm procedure: Based on the feedback values ​​of several pressure signals P1, P2 and height signal H, control the alarm module (44) to perform a first-level alarm, a second-level alarm, a third-level alarm or a fourth-level alarm.

9. The alarm method for working at height according to claim 8, characterized in that, The alarm procedure is as follows: B1: Preset h1=1.6m, h2=2m, p=10N; B2: Determine if the value of H is greater than the value of h2; if yes, proceed to step B4; otherwise, proceed to step B3. B3: When the value of P2 is greater than 10N, but the value of one or more of P1 is less than 10N, the alarm module (44) is controlled to perform a first-level alarm; when the value of all P1 is greater than 10N, but the value of P2 is less than 10N, the alarm module (44) is controlled to perform a second-level alarm; if the value of any P1 and P2 is greater than 10N, the alarm module (44) is controlled to perform a third-level alarm. B4: When the value of any P1 or P2 is greater than 10N, the alarm module (44) is controlled to perform a level four alarm.

10. The alarm method for working at height according to claim 8, characterized in that: If the alarm module (44) executes an alarm of any level, and if H is between h1 and h2 and all values ​​of P1 and P2 are greater than p, or if H is less than h1, the alarm will automatically stop.

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