Tower crane lifting safety detection device and method

Abstract

The present invention discloses a tower crane lifting safety detection device and method, including a calibration platform, wherein the upper end face and the lower end face of the calibration platform are two parallel planes, and the side surface of the calibration platform is evenly distributed with a number of indicator lights in the circumferential direction, and the lower end face of the calibration platform has at least three ball joint supports in an annular array, and the ball joint supports are equipped with a ball joint rod, and the outer wall of the ball joint rod is provided with a tension sensor along the axis direction of the ball joint rod, and the outer end of the ball joint rod is provided with a sling suspension mechanism, and the lower end face of the calibration platform is provided with a rotating table, and the rotating table is connected to a connecting rod, and the connecting rod is perpendicular to the upper end face of the calibration platform, and two distance measuring sensors are vertically connected to the lower part of the connecting rod in parallel, and the rotation path of the distance measuring sensor is concentric with the center of the annular array of all ball joint supports. The present invention can accurately evaluate the safety of the lifting of the object to be hoisted, avoid the occurrence of hidden dangers such as tilting of the object to be hoisted, false lifting of the sling, and uneven force on multiple slings, and improve the lifting safety of the tower crane.

Description

Technical Field

[0001] The invention belongs to the technical field of tower crane hoisting accessories, and in particular relates to a tower crane hoisting safety detection device and method. Background Art

[0002] Tower cranes are essential lifting equipment in the construction industry, with over 800,000 units currently in operation in China. They are widely used for the vertical and horizontal transportation of materials in multi-story and high-rise construction projects. A tower crane primarily consists of a tower base, tower body, boom, trolley, and hook, performing operations such as hook hoisting, trolley luffing, and boom slewing. As large construction equipment capable of lifting heavy objects, accidents involving tower cranes can easily lead to mass casualties, resulting in significant loss of life and economic losses. Therefore, safety monitoring of tower cranes plays a crucial role in ensuring the safe transportation of construction materials and preventing serious accidents, with significant economic and social benefits.

[0003] Tower crane lifting safety, with regard to the safety of the slings, currently relies primarily on the rigger to visually inspect the slings' shape, estimate the center of gravity of the load, and assess the safety of the lift. The rigger estimates the center of gravity by observing the load's shape, sets the sling's lifting position based on experience, and observes the tightness of the slings to assess lifting safety. However, the inventors believe that construction loads often have irregular shapes, varying lengths, and weights, making it difficult for the rigger to assess the load's center of gravity. Once the center of gravity is excessively biased, the load may tilt during material transfer, posing a risk of spillage. Furthermore, when using multiple slings to lift heavy loads, it is difficult to accurately assess the safety of the lift by visually observing the tightness of the slings alone. This can easily lead to some slings not bearing the load, uneven force distribution across multiple slings, and the potential for impact and slippage during material transfer, posing a risk of the load falling. Once the load falls or spills, it poses a serious threat to the lives of workers working below the tower crane. Therefore, it is necessary to develop a tower crane lifting safety detection device and method to accurately evaluate the safety of hook lifting, avoid hidden dangers such as tilting of the lifting object, empty lifting of the lifting cable, and uneven force on multiple lifting cables, and ensure the safety of hook lifting.

[0004] It should be noted that the information disclosed in the above background section is only used to enhance understanding of the background of the present disclosure and therefore may contain information that does not constitute prior art. Summary of the Invention

[0005] Through research, the inventors found that due to the different shapes of the objects being hoisted at the construction site, it is difficult to accurately assess the safety of lifting every time by simply observing the tightness of the slings with the naked eye by the sling operator. This can easily lead to some slings not bearing the heavy load and uneven force on multiple slings. As a result, problems such as impact and slippage may occur during the material transfer process, posing a risk of falling objects.

[0006] In view of at least one of the above technical problems, the present disclosure provides a tower crane lifting safety detection device and method, the specific technical solutions are as follows:

[0007] A tower crane lifting safety detection device includes a calibration platform, the upper end face and the lower end face of the calibration platform are two parallel planes, a number of indicator lights are evenly distributed around the side of the calibration platform, the lower end face of the calibration platform has at least three ball joint supports in an annular array, the ball joint supports are equipped with a ball joint rod, the outer side wall of the ball joint rod is provided with a tension sensor along the axial direction of the ball joint rod, the outer end of the ball joint rod is provided with a sling hanging mechanism, the lower end face of the calibration platform is provided with a rotating table, the rotating table is connected to a connecting rod, the connecting rod is perpendicular to the upper end face of the calibration platform, two distance measuring sensors are vertically connected in parallel to the lower part of the connecting rod, and the rotation path of the distance measuring sensor is concentric with the center of the annular array of all ball joint supports.

[0008] In some embodiments of the present disclosure, a lifting ring is provided on the upper end surface of the calibration platform, and the force-bearing point of the lifting ring and the center of the annular array of all ball joint supports are located on the same vertical line.

[0009] In some embodiments of the present disclosure, the calibration platform is a regular prism, and each side of the regular prism is provided with an indicator light.

[0010] In some embodiments of the present disclosure, the calibration platform is a regular quadrangular prism, and the lower end surface of the calibration platform has four spherical joint supports in a circular array, and the four spherical joint supports are distributed at the four corners of the lower end surface of the calibration platform.

[0011] In some embodiments of the present disclosure, the sling hanging mechanism includes a through slot, a slot wall of the through slot is provided with a through hole, and a hanging bolt is provided in the through hole.

[0012] A tower crane lifting safety detection method includes the above-mentioned tower crane lifting safety detection device, and the specific steps are:

[0013] The first step is to connect each sling suspension mechanism to a sling, and each sling is connected to a different lifting position on the object to be lifted, completing the lifting preparation;

[0014] In the second step, the tower crane is equipped with a calibration platform to test lift the object. The test lifting height is no more than 0.5 meters. The rotating platform is linked to the connecting rod to align with a ball joint rod. At this time, the upper and lower distance measuring sensors can measure the distance between them and the ball joint rod respectively, which are d1 and d2. According to the formula The pitch angle α of the axis of the ball hinge at this state can be obtained, where D is the height difference between the upper and lower distance sensors; the tension sensor can detect the axial tension F of the ball hinge at this state, and the formula F H =Fcos(α) The vertical component of the tension on the spherical hinge at this state can be obtained as FH The rotating table and the connecting rod rotate one circle, and the vertical component of the tension on each ball joint rod can be measured according to the above steps. H ;

[0015] The third step is to set the vertical line at the center of the circular array of all ball joint supports as the desired center of gravity direction G. If the F of a certain ball joint rod is H Significantly higher than the F of other ball hinges H If the value is less than 0, it means that the center of gravity of the object under test is not in the expected position and there is a serious eccentricity. If the object is lifted further, it may tilt. At this time, the indicator light on the side of the eccentricity will send out signal I to remind the rigger to adjust the lifting position of the object. If the F value of a certain ball hinge rod is less than 0, it means that the center of gravity of the object under test is not in the expected position and there is a serious eccentricity. If the object is lifted further, it may tilt. H Significantly lower than the F of other ball hinges H If the value is less than 0, it means that the sling of this ball hinge is in virtual lifting. If the lifting is continued, the object may be impacted and slipped. At this time, the indicator light on the side of the virtual lifting direction will send out signal Ⅱ to remind the sling operator to check the corresponding sling or adjust the lifting position of the object. If the F value of each ball hinge is less than 0, it means that the sling of this ball hinge is in virtual lifting. If the F value of each ball hinge is less than 0, it means that the object may be impacted and slipped. H If it exceeds the safety range, it means that the ropes are unevenly stressed and the object may slip if the lifting is continued. At this time, all indicator lights send signal III to remind the sling operator to check the ropes and adjust the lifting position.

[0016] In some embodiments of the present disclosure, signal I of the indicator light is a constantly lit yellow light, signal II is a constantly lit red light, and signal III is a flashing yellow light.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This system uses a multi-cable tension and pitch angle detection method. By comparing and analyzing the vertical component of the tension of multiple cables, it accurately identifies safety hazards such as tilted loads, insufficient cable lift, and uneven loads on multiple cables. It assists riggers in estimating the center of gravity of loads and assessing lifting safety. Indicator lights prompt riggers to check corresponding cables and adjust lifting positions, effectively ensuring tower crane lifting safety.

[0019] 2. The device adopts a circular array ball hinge mechanism, and the ball hinge rod can achieve spherical swing in the horizontal direction, which is convenient for lifting objects at different positions of the sling;

[0020] 3. A rotating table is connected to two distance measuring sensors that rotate in a circular motion. A set of distance measuring equipment is used to detect the pitch angle of each ball hinge axis. This greatly reduces the detection cost and facilitates the expansion of the number of slings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a three-dimensional schematic diagram of the first viewing angle of Example 1 of the structure of the present invention;

[0022] Figure 2 This is a three-dimensional schematic diagram of the hoisting state of the second viewing angle of Example 1 in the structure of the present invention.

[0023] Explanation of the numbers in the figure: 1. Calibration platform; 11. Indicator light; 12. Lifting ring; 2. Ball joint support; 21. Ball joint rod; 211. Hoisting device suspension mechanism; 2111. Through slot; 2112. Lifting bolt; 3. Tension sensor; 4. Connecting rod; 5. Distance sensor; 6. Lifting rope; 7. Lifted object. DETAILED DESCRIPTION

[0024] In order to better understand the purpose, structure and function of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0025] The serial numbers assigned to the components herein are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" mentioned in this disclosure includes direct and indirect "connections" unless otherwise specified. In the description of this application, it should be understood that the orientation terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and brief description, and do not indicate or imply that the device or unit referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on this application.

[0026] As shown in the attached figure Figures 1 to 2 As shown, a tower crane lifting safety detection device is designed, including a calibration platform 1, the upper end face and the lower end face of the calibration platform 1 are two parallel planes, and several indicator lights 11 are evenly distributed on the side of the calibration platform 1. The lower end face of the calibration platform 1 has at least three ball joint supports 2 in a circular array, and the ball joint support 2 is equipped with a ball joint rod 21. The outer wall of the ball joint rod 21 is provided with a tension sensor 3 along the axial direction of the ball joint rod 21, and the outer end of the ball joint rod 21 is provided with a hoist hanging mechanism 211. The lower end face of the calibration platform 1 is provided with a rotating table, and the rotating table is connected to a connecting rod 4. The connecting rod 4 is perpendicular to the upper end face of the calibration platform 1, and two distance measuring sensors 5 are vertically connected in parallel at the lower part of the connecting rod 4. The rotation path of the distance measuring sensor 5 is concentric with the center of the circular array of all ball joint supports 2.

[0027] A tower crane hoisting safety detection method is also disclosed, which is characterized by comprising the above-mentioned tower crane hoisting safety detection device, and the specific steps are:

[0028] The first step is to connect each sling suspension mechanism 211 to a sling 6, and each sling 6 is connected to a different lifting position on the object 7 to complete the lifting preparation;

[0029] In the second step, the tower crane is equipped with a calibration platform to test lift the object 7. The test lifting height is no more than 0.5 meters. The rotating platform is linked to the connecting rod 4 to align with a ball joint rod 21. At this time, the upper and lower distance measuring sensors 5 can measure the distance between them and the ball joint rod 21 respectively, d1 and d2. According to the formula The pitch angle α of the axis of the ball hinge 21 in this state can be obtained, where D is the height difference between the upper and lower distance sensors 5; the tension sensor 3 can detect the axial tension F of the ball hinge 21 in this state, and the formula F is used. H =F cos(α) The vertical component of the tension on the ball hinge 21 in this state can be obtained as F H The rotating table linkage connecting rod 4 rotates one circle, and the above steps can be measured at this time to obtain the vertical component of the tension exerted on each ball hinge rod 21. H ;

[0030] The third step is to assume that the vertical line at the center of the annular array of all ball joint supports 2 is the desired center of gravity direction G. If the F of a certain ball joint rod 21 H Significantly higher than the F of other ball hinges 21 H If the value is less than 0.05, it means that the center of gravity of the suspended object 7 is not in the expected position in this trial lifting state, and there is a serious eccentricity. If the lifting is continued, the suspended object 7 may tilt. At this time, the indicator light 11 on the side of the eccentric direction sends a signal I to remind the rigger to adjust the lifting position of the suspended object 7. If the F value of a certain ball hinge rod 21 is less than 0.05, it means that the center of gravity of the suspended object 7 is not in the expected position in this trial lifting state, and there is a serious eccentricity. If the lifting is continued, the suspended object 7 may tilt. H Significantly lower than the F of other ball hinges 21 H If the value is 0, it means that the sling 6 of the ball hinge rod 21 is in a virtual lifting state. If the lifting continues, the object 21 may be impacted and slipped. At this time, the indicator light 11 on the side of the virtual lifting direction sends a signal II to remind the sling operator to check the corresponding sling 6 or adjust the lifting position of the object 7. If the F value of each ball hinge rod 21 is 0, the object 21 may be impacted and slipped. H If the variance exceeds the safe range, it indicates that the ropes 6 are unevenly stressed and continued lifting may cause the object 7 to slip due to impact. At this time, all indicator lights 11 send signal III to remind the rope operator to check the ropes 6 and adjust the lifting position.

[0031] The present invention adopts a method of detecting the tension and pitch angle of multiple cables 6. By comparing and analyzing the component forces of the tension of multiple cables 6 along the vertical direction, it can accurately identify safety hazards such as the tilt of the suspended object 7, the false suspension of the cables 6, and the uneven force on multiple cables 6. It assists the rigging operator in estimating the center of gravity of the suspended object 7 and evaluating the lifting safety. It can also prompt the rigging operator to check the corresponding cables 6 and adjust the lifting position through different signals of the indicator light 11, effectively ensuring the lifting safety of the tower crane.

[0032] In the above implementation, two embodiments are listed to implement the above technical solution:

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, this embodiment discloses a tower crane lifting safety detection device, including a calibration platform 1, the upper end face of the calibration platform 1 is provided with a lifting ring 12, the force point of the lifting ring 12 and the center of the annular array of all ball joint supports 2 are on the same vertical line, the calibration platform 1 is a regular square prism, each side of the regular prism is provided with an indicator light 11, the lower end face of the calibration platform 1 has four ball joint supports 2 in an annular array, the device adopts a ball joint mechanism of an annular array, the ball joint rod 21 can realize spherical swing in the horizontal direction, which is convenient for the sling 6 to lift the suspended object 7 at different positions, the four ball joint supports 2 are distributed at the four corners of the lower end face of the calibration platform 1, and the ball joint support 2 is equipped with a ball joint rod 21. The outer wall of the ball joint rod 21 is provided with a tension sensor 3 along the axial direction of the ball joint rod 21. The outer end of the ball joint rod 21 is provided with a sling suspension mechanism 211. The lower end face of the calibration platform 1 is provided with a rotating table. The rotating table is connected to a connecting rod 4. The connecting rod 4 is perpendicular to the upper end face of the calibration platform 1. Two distance measuring sensors 5 are vertically connected in parallel at the lower part of the connecting rod 4. The rotation path of the distance measuring sensor 5 is concentric with the center of the circular array of four ball joint supports 2. The rotating table is connected to the two distance measuring sensors 5 for circular rotation. A set of sensing and ranging equipment is used to detect the pitch angle of the axis of each ball joint rod 21 relative to the vertical line. The detection cost is greatly reduced, which facilitates the expansion of the number of slings 6.

[0035] Among them, the rotating table can be a 360° electric rotating table, the ranging sensor is a laser reflection ranging sensor, which in this embodiment can be a BX-LV10 laser ranging sensor; the tension sensor is an S-type resistance strain type tension sensor, which in this embodiment can be a DYLY-10 tension sensor.

[0036] Also disclosed is a tower crane lifting safety detection method, comprising the above-mentioned tower crane lifting safety detection device, and the specific steps are:

[0037] The first step is to connect each of the four sling suspension mechanisms 211 to a sling 6, and each sling 6 is connected to a different lifting position on the object 7 to complete the lifting preparation;

[0038] In the second step, the tower crane is equipped with a calibration platform 1 to test lift the object 7. The test lifting height is no more than 0.5 meters. The rotating platform is linked to the connecting rod 4 to align with a ball joint rod 21. At this time, the upper and lower distance measuring sensors 5 can measure the distance between them and the ball joint rod 21 respectively, d1 and d2. According to the formula The pitch angle α of the axis of the ball hinge 21 in this state can be obtained, where D is the height difference between the upper and lower distance sensors 5; the tension sensor 3 can detect the axial tension F of the ball hinge 21 in this state, and the formula F is used. H =F cos(α) The vertical component of the tension on the ball hinge 21 in this state can be obtained as F H The rotating table linkage connecting rod 4 rotates one circle, and then aligns with the four ball hinge rods 21. According to the above steps, the vertical component of the tension in the vertical direction of each ball hinge rod 21 under this state can be measured. H ;

[0039] The third step is to set the vertical line at the center of the annular array of four ball hinge supports 2 as the desired center of gravity direction G. If the F of a certain ball hinge rod 21 H Obviously higher than the F of the other three ball hinge rods 21 H If the value is less than 0.05, it indicates that the center of gravity of the suspended object 7 is not in the expected position in this trial lifting state, and there is a serious eccentricity. If the lifting is continued, the suspended object 7 may tilt. At this time, the indicator light 11 on the side of the eccentric direction sends a signal I. The signal I of the indicator light 11 is a steady yellow light, reminding the rigging operator to adjust the lifting position of the suspended object 7. If the F value of a certain ball joint rod 21 is less than 0.05, it indicates that the center of gravity of the suspended object 7 is not in the expected position in this trial lifting state, and there is a serious eccentricity. If the lifting is continued, the suspended object 7 may tilt. H Obviously lower than the F of the other three ball hinge rods 21 H If the value is 0, it means that the sling 6 of the ball hinge rod 21 is in a virtual lifting state. If the lifting continues, the object 21 may be impacted and slipped. At this time, the indicator light 11 on the side of the virtual lifting direction sends out signal II. Signal II is a constant red light, reminding the sling operator to check the corresponding sling 6 or adjust the lifting position of the object 7. If the F value of each ball hinge rod 21 is 0, it means that the sling 6 of the ball hinge rod 21 is in a virtual lifting state. If the F value of each ball hinge rod 21 is 0, it means that the object 21 may be impacted and slipped ... H If the tension between the slings 6 exceeds the safety range, which can be ±10%, it means that the slings 6 are unevenly stressed and continued lifting may cause the suspended object 7 to slip due to impact. At this time, all indicator lights 11 send signal III, which is a flashing yellow light, to remind the sling operator to check the slings 6 and adjust the lifting position.

[0040] Example 2

[0041] This embodiment discloses a tower crane lifting safety detection method. The difference between this embodiment and Example 1 is that the calibration platform 1 is a cylinder, and the tower crane uses an electromagnetic sling equipped with the upper plane of the calibration platform 1.

[0042] Example 3

[0043] The present embodiment discloses a tower crane lifting safety detection device, including a calibration platform 1, wherein the upper end face of the calibration platform 1 is provided with a lifting ring 12, the force point of the lifting ring 12 and the center of the annular array of all ball joint supports 2 are on the same vertical line, the calibration platform 1 is a regular triangular prism, each side of the regular triangular prism is provided with an indicator light 11, and the lower end face of the calibration platform 1 has three ball joint supports 2 in an annular array. The device adopts a ball joint mechanism of an annular array, and the ball joint rod 21 can realize spherical swing in the horizontal direction, which is convenient for the sling 6 to lift the suspended object 7 at different positions. The three ball joint supports 2 are distributed at the three corners of the lower end face of the calibration platform 1, and the ball joint supports 2 are equipped with a ball joint rod 2 1. A tension sensor 3 is provided on the outer side wall of the ball joint rod 21 along the axial direction of the ball joint rod 21. A sling suspension mechanism 211 is provided on the outer end portion of the ball joint rod 21. A rotating table is provided on the lower end surface of the calibration platform 1. The rotating table is connected to a connecting rod 4. The connecting rod 4 is perpendicular to the upper end surface of the calibration platform 1. Two distance measuring sensors 5 are vertically connected in parallel at the lower part of the connecting rod 4. The rotation path of the distance measuring sensor 5 is concentric with the center of the circular array of the three ball joint supports 2. The rotating table is connected to the two distance measuring sensors 5 for circular rotation. A set of sensing and ranging equipment is used to detect the pitch angle of the axis of each ball joint rod 21 relative to the vertical line. The detection cost is greatly reduced, which facilitates the expansion of the number of slings 6.

[0044] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A tower crane lifting safety detection device, characterized in that: The invention comprises a calibration platform (1), wherein the upper end face and the lower end face of the calibration platform (1) are two parallel planes, a plurality of indicator lights (11) are evenly distributed on the side of the calibration platform (1), the lower end face of the calibration platform (1) has at least three ball joint supports (2) in an annular array, the ball joint support (2) is equipped with a ball joint rod (21), the outer side wall of the ball joint rod (21) is provided with a tension sensor (3) along the axial direction of the ball joint rod (21), the outer end of the ball joint rod (21) is provided with a hanger suspension mechanism (211), the lower end face of the calibration platform (1) is provided with a rotating platform, the rotating platform is connected to a connecting rod (4), the connecting rod (4) is perpendicular to the upper end face of the calibration platform (1), the lower part of the connecting rod (4) is vertically connected to two distance measuring sensors (5) in parallel, and the rotation path of the distance measuring sensor (5) is concentric with the center of the annular array of all ball joint supports (2); The upper end surface of the calibration platform (1) is provided with a lifting ring (12), and the force bearing point of the lifting ring (12) and the center of the annular array of all ball joint supports (2) are located on the same vertical line; The calibration platform (1) is a regular prism, and each side of the regular prism is provided with an indicator light (11); The calibration platform (1) is a regular quadrangular prism, and the lower end surface of the calibration platform (1) has four spherical joint supports (2) in an annular array, and the four spherical joint supports (2) are distributed at the four corners of the lower end surface of the calibration platform (1); The sling hanging mechanism (211) comprises a through slot (2111), a slot wall of the through slot (2111) is provided with a through hole, and a hanging bolt (2112) is arranged in the through hole.

2. A tower crane lifting safety detection method, characterized in that: The tower crane lifting safety detection device described in claim 1 is used, and the specific steps are as follows: The first step is to connect each sling suspension mechanism (211) to a sling (6), and each sling (6) is connected to a different lifting position on the object to be lifted (7), thereby completing the lifting preparation; In the second step, the tower crane is equipped with a calibration platform (1) to test lift the object (7). The test lifting height is not more than 0.5 meters. The rotating platform is linked to the connecting rod (4) to align with a ball joint rod (21). At this time, the upper and lower distance measuring sensors (5) can respectively measure the distance between them and the ball joint rod (21), which are d1 and d2 respectively. According to the formula The pitch angle α of the axis of the ball hinge rod (21) in this state can be obtained, where D is the height difference between the upper and lower distance sensors (5); the tension sensor (3) can detect the axial tension F of the ball hinge rod (21) in this state, and the formula F is: H =Fcos(α) The vertical component of the tension borne by the ball hinge (21) in this state can be obtained as F H The rotating table linkage connecting rod (4) rotates one circle, and the above steps can be used to measure the vertical component of the tension F borne by each ball hinge rod (21) at this time. H ; The third step is to set the vertical line at the center of the annular array of all ball hinge supports (2) as the desired center of gravity direction G. If the F of a certain ball hinge rod (21) H Significantly higher than the F of other ball hinges (21) H If the value is not found, it indicates that the center of gravity of the suspended object (7) in this trial lifting state is not in the expected position and there is a serious eccentricity. If the lifting is continued, the suspended object (7) may tilt. At this time, the indicator light (11) on the side of the eccentricity direction sends a signal I to remind the rigger to adjust the lifting position of the suspended object (7). If the F value of a certain ball hinge rod (21) is H Significantly lower than the F of other ball hinges (21) H If the value is 0, it indicates that the sling (6) of the ball hinge rod (21) is in a virtual position, and if the lifting is continued, the object (7) may be impacted and slipped. At this time, the indicator light (11) on the side of the virtual lifting direction sends a signal II to remind the sling operator to check the corresponding sling (6) or adjust the lifting position of the object (7). If the F value of each ball hinge rod (21) is H If it exceeds the safety range, it indicates that the forces on the slings (6) are uneven and the object (7) may slip due to impact if the slings (6) are continued to be lifted. At this time, all indicator lights (11) send signal III to remind the sling operator to check the slings (6) and adjust the lifting position.

3. A tower crane lifting safety detection method according to claim 2, characterized in that: The signal I of the indicator light (11) is a constantly lit yellow light, the signal II is a constantly lit red light, and the signal III is a flashing yellow light.

Images