Method for determining hoisting belt for hoisting tripod

Abstract

The invention provides a method for determining a hoisting belt for hoisting a tripod, which comprises a tripod and a hoisting belt, the tripod comprises a front support rod and a rear pull rod, the tripod is arranged on a crane revolving platform, and the bearing capacity and the length of the hoisting belt are calculated, and the method comprises the following specific steps: S1, presetting the front support rod mounting position and the rear pull rod mounting position of the revolving platform; the front support rod is provided with a lower lifting lug and a mounting hole; the rear pull rod is provided with a lifting belt mounting hole and an assembly hole; s2, confirming the mounting position parameters of a front supporting rod and a rear pulling rod; s3, parameters between the lower lifting lug and the mounting hole are determined, and the length of the lifting belt is obtained; s4, confirming parameters of the rear pull rod; s5, determining parameters between the suspender and the front support rod and the rear pull rod, obtaining the suspender bearing capacity, and calculating the suspender bearing capacity and length conveniently and accurately.

Description

Technical Field

[0001] The invention relates to the technical field of crane tripod equipment, and in particular to a method for determining a sling for tripod hoisting. Background Art

[0002] When using a crane to perform various complex lifting operations, the crane tripod can provide solid support for the crane to ensure that the crane can operate stably. The tripod needs to be installed on the crane's revolving platform. The tripod includes a front support rod and a rear pull rod. The front support rod and the rear pull rod are hinged, and the tripod needs to be installed vertically on the revolving platform.

[0003] For example, the patent application number is 202011312365.X, and the publication date is 2023.01.10. The patent document discloses a method for hoisting an offshore crane, which comprises the following steps: randomly selecting three hoisting points that are not in the same plane to obtain the center of gravity of the base; determining the hoisting points; connecting the lifting ears to the lifting points; connecting the lifting ears to the lifting ears through the steel wire ropes of the crane to realize the hoisting of the base; hoisting of the slewing platform assembly; randomly selecting three hoisting points that are not in the same plane to obtain the center of gravity of the slewing platform assembly, determining the hoisting points; connecting the lifting ears on the left side. Connect the lifting ears to the lifting points of the ears; use the wire ropes of the crane to respectively connect the lifting ears on the left and the lifting points on the right connecting ears to realize the lifting of the base; for the lifting of the tripod, take any three lifting points that are not in the same plane to find the center of gravity of the tripod; determine the lifting points for lifting; use wire ropes to respectively connect the top lifting point and the lower lifting point, let the upper ends of all the wire ropes converge and connect to the crane, and use the crane to realize lifting; for the lifting of the boom, it has the advantages of accurate and convenient selection of lifting points for crane components and reasonable force on components during lifting.

[0004] In the above literature, the front support rod and the rear pull rod of the tripod are connected by a support rod. When hoisting, the front support rod and the rear pull rod need to be pulled apart first, and then a hard connecting rod is installed between the front support rod and the rear pull rod. The connecting rod needs to be hoisted by large hoisting equipment to achieve installation, which is complicated and costly to operate. When a flexible sling is used to connect the front support rod and the rear pull rod, the tension of the sling needs to be considered when hoisting the tripod to prevent the sling from breaking and affecting the reliability of the hoisting tripod. Therefore, the length and load-bearing capacity of the sling need to be determined to meet the hoisting needs. Summary of the invention

[0005] The invention provides a method for determining a sling for tripod hoisting, which ensures the reliability of hoisting by calculating the carrying capacity and length of the sling.

[0006] To achieve the above object, the technical solution of the present invention is: a method for determining a sling for a tripod hoisting, wherein the tripod comprises a front support rod and a rear pull rod, the front ends of the front support rod and the rear ends of the rear support rod are hinged, and the rear ends of the front support rod and the rear ends are connected by a flexible sling, and the specific steps include: S1 presets the installation position of the front support rod and the rear tie rod of the slewing platform, the front support rod is provided with a lower lifting lug and a mounting hole, and the rear tie rod is provided with a lifting lug mounting hole and an assembly hole; S2 determines the distance between the mounting hole on the front support rod and the assembly hole on the rear tie rod according to the mounting position on the slewing platform; S3 confirms the distance between the lower lifting lug and the mounting hole, and calculates the sling length based on the distance between the mounting hole on the front support rod and the assembly hole on the rear tie rod and the distance between the lower lifting lug and the mounting hole; S4 confirms the rear tie rod parameters; the rear tie rod parameters include the rear tie rod gravity, center of gravity and length; S5 determines the sling load capacity based on the rear tie rod parameters.

[0007] With the above arrangement, when hoisting the front support rod and the rear pull rod, the front support rod is first pulled up, and then a flexible sling is arranged at the rear ends of the front support rod and the rear pull rod. Before the front support rod and the rear pull rod are connected with the sling, the length of the sling can be conveniently determined according to the distance between the mounting hole on the front support rod and the mounting hole of the rear pull rod and the distance between the lower lifting ear and the mounting hole. Then, the bearing capacity of the sling is calculated according to the gravity and center of gravity of the rear pull rod and the length of the rear pull rod according to the principle of moment balance. By accurately calculating the bearing capacity of the sling, it can be ensured that the sling can withstand the maximum load in the actual hoisting process, and the tripod is pulled up horizontally under the action of the gravity of the rear pull rod so that the sling is in a taut state and will not exceed the length setting required for installation, thereby avoiding sling breakage or hoisting failure caused by overloading, improving the stability and safety of hoisting, and on the other hand, calculating the required length of the sling can reduce the time for adjusting the hoisting position on site and improve the hoisting installation efficiency.

[0008] Furthermore, step S3 also includes: determining the angle between the sling and the straight line where the mounting holes on the front strut and the rear pull rod assembly holes are located according to the distance between the mounting holes on the front strut and the rear pull rod assembly holes and the distance between the lower lifting ear and the mounting holes, and obtaining the sling length.

[0009] The above arrangement is based on the angle between the sling and the straight line where the mounting holes on the front support rod and the assembly holes on the rear tie rod are located, and the length of the sling is determined according to the angle, which is convenient for calculation.

[0010] Furthermore, step S5 also includes: determining the carrying capacity of the sling according to the parameters of the rear tie rod and the angle between the sling and the straight line where the mounting holes on the front support rod and the rear tie rod assembly holes are located.

[0011] With the above settings, the bearing capacity of the entire sling can be calculated by calculating the component of force in the vertical direction of the sling through the angle.

[0012] Furthermore, the tripod also includes a pulley frame, one end of the pulley frame is connected to the front support rod, and the other end of the pulley frame is connected to the rear pull rod.

[0013] In the above arrangement, the front support rod and the rear pull rod are connected via a pulley frame, so that the rear pull rod and the front support rod are rotatably connected.

[0014] Furthermore, in step S1, the front support rod mounting hole is connected to the front support rod mounting position on the rotating platform, and the rear tie rod assembly hole is connected to the rear tie rod mounting position on the rotating platform.

[0015] In the above arrangement, a mounting hole is arranged on the front support rod, and the front support rod is connected to the rotating platform through the mounting hole; an assembly hole is arranged on the rear pull rod, and the rear pull rod is connected to the rotating platform through the assembly hole.

[0016] Furthermore, in step S2, the distance s1 between the installation position of the front strut and the installation position of the rear tie rod is measured. The above settings can be used to measure the distance s1 between the front support rod installation position and the rear pull rod installation position on the slewing platform to obtain the required distance between the installation hole and the assembly hole, thereby providing a basis for calculating the sling length in the next step S3.

[0017] Furthermore, in step S3, the distance s1 between the front strut installation position and the rear tie rod installation position on the rotating platform in step S2 is equal to the distance s2 from the front strut installation hole to the rear tie rod assembly hole, the horizontal distance s3 and the vertical distance d1 from the center of the lower lifting ear to the center of the installation hole are measured, and the angle A between the sling and the vertical direction is determined by tanA=s3 / (s2-d1), and the sling length s4 is obtained by the angle A and the horizontal distance s3 from the center of the lower lifting ear to the installation hole, that is, s4=s3 / sinA.

[0018] With the above settings, since s1 is obtained in step S2, it can be obtained that the distance s2=s1 from the mounting hole of the support rod to the assembly hole of the rear pull rod, and then the horizontal distance s3 from the center of the lower hanging ear to the center of the mounting hole is measured. Since the center of the mounting hole and the center of the assembly hole are on the same horizontal line, the horizontal distance s3 from the center of the lower hanging ear to the center of the mounting hole is equal to the horizontal distance from the center of the lower hanging ear to the center of the assembly hole. The vertical distance d1 from the center of the lower hanging ear to the center of the mounting hole is measured. The vertical distance from the assembly hole to the center of the lower hanging ear can be obtained by s2-d1. The angle A between the sling and the vertical direction is determined by tanA=s3 / (s2-d1). The sling length s4=s3 / sinA. The solution method is reliable and simple.

[0019] Furthermore, in step S4, the center of gravity position of the rear tie rod, the weight of the rear tie rod g1, the length of the rear tie rod s5, and the position from the center of gravity to the center of the assembly hole s6 are confirmed, and the gravity g2 from the center of gravity position of the rear tie rod to the center of the assembly hole is calculated, F1*s5=g2*(s5-s6), where F1 is the pulling force of the sling on the rear tie rod in the vertical direction.

[0020] With the above settings, the center of gravity position of the rear tie rod is obtained through the three-dimensional model. When the rear tie rod is hoisted horizontally, the pulley frame mainly bears the gravity on the left side of the center of gravity, and the sling mainly bears the gravity on the right side of the center of gravity. Therefore, it is necessary to calculate the weight g2 of the rear tie rod, the length s5 of the rear tie rod, and the position s6 from the center of gravity to the center of the assembly hole. Since the front support rod is in a balanced state through the sling, the rear tie rod is in a balanced state relative to the pulley mounting frame under the action of the sling tension. According to the principle of moment balance, the force on the sling in the vertical direction can be obtained.

[0021] Furthermore, in step S5, the carrying capacity of the sling is F=F1*cosA.

[0022] In the above configuration, the sling is tilted, and the carrying capacity of the sling is obtained by multiplying the vertical tension F1 of the sling acting on the rear pull rod by the angle A. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0025] Figure 3 It is a schematic diagram of the force analysis of the assembly hole in the present invention.

[0026] Explanation of the accompanying figures: 1-front support rod; 11-mounting hole; 12-lower lifting ear; 2-rear pull rod; 20-lifting ear mounting hole; 21-center of gravity position; 22-assembly hole; 3-pulley frame; 4-sling. DETAILED DESCRIPTION

[0027] like Figure 1-3 As shown, a method for determining a sling for hoisting a tripod is provided. The tripod comprises a front support rod 1 and a rear tie rod 2. The front support rod 1 and the rear tie rod 2 are connected by a flexible sling 4. The tripod is arranged on a revolving platform of a crane. Before hoisting the tripod, the length and bearing capacity of the sling are first determined. The specific steps include: S1 presets the installation position of the front support rod 1 and the installation position of the rear tie rod 2 of the slewing platform, the front support rod 1 is provided with a lower lifting lug 12 and a mounting hole 11, and the rear tie rod 2 is provided with a lifting lug mounting hole 20 and an assembly hole 22; S2 determines the distance between the mounting hole 11 on the front support rod 1 and the assembly hole 22 on the rear tie rod 2 according to the mounting position on the rotary platform; S3 confirms the distance between the lower lifting lug 12 and the mounting hole 11, and obtains the sling length according to the distance between the mounting hole 11 on the front support rod 1 and the assembly hole 22 on the rear tie rod 2 and the distance between the lower lifting lug 12 and the mounting hole 22; S4 confirms the parameters of the rear tie rod 2; the rear tie rod parameters include the weight, center of gravity and length of the rear tie rod; S5 determines the sling load capacity based on the rear tie rod parameters.

[0028] like Figure 1-2 As shown, the tripod also includes a pulley frame 3, one end of the pulley frame 3 is connected to the front support rod 1, and the other end of the pulley frame 3 is connected to the rear pull rod 2. The front support rod 1 and the rear pull rod 2 are connected through the pulley frame 3, so that the rear pull rod 2 and the front support rod 1 are rotatably connected.

[0029] In step S1, the mounting hole 11 of the front strut 1 is connected to the mounting position of the front strut 1 on the rotating platform, and the assembly hole 22 of the rear tie rod 2 is connected to the mounting position of the rear tie rod 2 on the rotating platform. The front strut 1 is provided with a mounting hole 11, and the front strut 1 is connected to the rotating platform through the mounting hole 11. The rear tie rod 2 is provided with an assembly hole 22, and the rear tie rod 2 is connected to the rotating platform through the assembly hole 22.

[0030] In step S2, the distance s1 between the installation position of the front support rod 1 and the installation position of the rear tie rod 2 is measured. By measuring the distance between the installation position of the front support rod 1 and the installation position of the rear tie rod 2 on the revolving platform, the required distance between the installation hole 11 and the assembly hole 22 can be obtained, thereby providing a basis for calculating the sling length in the next step S3.

[0031] In step S3, the distance s1 between the installation position of the front support rod 1 and the installation position of the rear tie rod 2 obtained in step S2 is equal to the distance s2 from the installation hole 11 of the front support rod 1 to the assembly hole 22 of the rear tie rod 2, and the horizontal distance s3 and the vertical distance d1 from the center of the lower lifting ear 12 to the center of the mounting hole 11 are measured, and the angle A between the sling and the vertical direction is determined by tanA=s3 / (s2-d1). The sling length s4 can be obtained by the angle A and the horizontal distance s3 from the center of the lower lifting ear 12 to the mounting hole 11, that is, s4=s3 / sinA. Since s1 is obtained in step S2, it can be obtained that the distance s2=s1 from the support rod mounting hole 11 to the assembly hole 22 of the rear pull rod 2, and then the horizontal distance s3 from the center of the lower lifting ear 12 to the center of the mounting hole 11 is measured. Since the center of the mounting hole 11 and the center of the assembly hole 22 are on the same horizontal straight line, the horizontal distance s3 from the center of the lower lifting ear 12 to the center of the mounting hole 11 is equal to the horizontal distance from the center of the lower lifting ear 12 to the center of the assembly hole 22. The vertical distance d1 from the center of the lower lifting ear 12 to the center of the mounting hole 11 is measured. The vertical distance from the assembly hole 22 to the center of the lower lifting ear 12 can be obtained by s2-d1. The angle A between the sling and the vertical direction is determined by tanA=s3 / (s2-d1), and the sling length s4=s3 / sinA.

[0032] like Figure 1-3As shown, in step S4, the center of gravity position 21 of the rear tie rod 2, the weight g1 of the rear tie rod 2, the length s5 of the rear tie rod 2, and the center of gravity position s6 to the center of the assembly hole 22 are confirmed, and the gravity g2 from the center of gravity position 21 of the rear tie rod 2 to the center of the assembly hole 22 is calculated, F1*s5=g2*(s5-s6), F1 is the pulling force of the sling on the rear tie rod 2 in the vertical direction, and the center of gravity position 21 of the rear tie rod 2 is obtained through the three-dimensional model. When the rear tie rod 2 is hoisted horizontally, the pulley frame 3 mainly bears The sling mainly bears the gravity on the right side of the center of gravity, so it is necessary to calculate the weight g2 of the rear rod 2, the length s5 of the rear rod 2, and the position s6 from the center of gravity to the center of the assembly hole 22. According to the principle of moment balance, the direction of the gravity of the rear rod 2 is vertically downward. In order for the sling to bear the weight of the rear rod 2, the vertical tension F1 of the sling acting on the rear rod 2 must be at least equal to the gravity on the right side of the center of gravity 21 of the rear rod 2. Therefore, F1*s5=g2*(s5-s6).

[0033] In step S5, the carrying capacity of the sling is F=F1 / cosA. The sling is tilted, and the carrying capacity of the sling is obtained by multiplying the vertical pulling force F1 of the sling on the rear pull rod 2 by the angle A, that is, F=F1*cosA.

[0034] The working principle of the present invention is as follows: when suspending the front support rod 1 and the rear pull rod 2, the front support rod 1 is first pulled up, and then a flexible sling 4 is set at the rear ends of the front support rod 1 and the rear pull rod 2. Before the front support rod 1 and the rear pull rod 2 are connected by the sling 4, the length of the sling 4 can be conveniently determined according to the distance between the mounting hole 11 on the front support rod 1 and the assembly hole 22 of the rear pull rod 2 and the distance between the lower lifting ear 12 and the mounting hole 22. Then, according to the gravity and center of gravity of the rear pull rod 2 and the length of the rear pull rod 2, the length of the sling 4 can be calculated according to the principle of moment balance. The load-bearing capacity of the sling 4 can be accurately calculated to ensure that the sling 4 can withstand the maximum load in the actual lifting process, and the tripod is pulled up horizontally under the gravity of the rear pull rod so that the sling 4 is in a taut state and will not exceed the length setting required for installation, thereby avoiding the breakage of the sling 4 or lifting failure due to overload, improving the stability and safety of the lifting. On the other hand, calculating the required length of the sling 4 can reduce the time for adjusting the lifting position on site and improve the lifting installation efficiency.

Claims

1. A method for determining a sling for a tripod, wherein the tripod comprises a front support rod and a rear pull rod, the front ends of the front support rod and the rear pull rod are hinged, and the method is characterized in that: The rear ends of the front support rod and the rear support rod are connected by a flexible sling, and the specific steps include: S1 presets the installation position of the front support rod and the installation position of the rear tie rod of the slewing platform, the front support rod is provided with a lower lifting ear and a mounting hole, and the rear tie rod is provided with a lifting ear mounting hole and an assembly hole; S2 determines the distance between the mounting hole on the front support rod and the assembly hole on the rear tie rod according to the mounting position on the slewing platform; S3 confirms the distance between the lower lifting lug and the mounting hole, and calculates the sling length based on the distance between the mounting hole on the front support rod and the assembly hole on the rear tie rod and the distance between the lower lifting lug and the mounting hole; S4 confirms the rear tie rod parameters; the rear tie rod parameters include the rear tie rod gravity, center of gravity and length; S5 determines the sling load capacity based on the rear tie rod parameters.

2. A method for determining a sling for tripod hoisting according to claim 1, characterized in that: Step S3 also includes: determining the angle between the sling and the straight line where the mounting holes on the front strut and the rear pull rod assembly holes are located according to the distance between the mounting holes on the front strut and the rear pull rod assembly holes and the distance between the lower lifting ear and the mounting holes, and obtaining the sling length.

3. A method for determining a sling for tripod hoisting according to claim 2, characterized in that: Step S5 also includes: determining the carrying capacity of the sling according to the parameters of the rear tie rod and the angle between the sling and the straight line where the mounting holes on the front support rod and the rear tie rod assembly holes are located. With the above settings, the bearing capacity of the entire sling can be calculated by calculating the component of force in the vertical direction of the sling through the angle.

4. A method for determining a sling for tripod hoisting according to claim 1, characterized in that: The tripod also includes a pulley frame, one end of which is connected to the front support rod, and the other end of which is connected to the rear pull rod.

5. The method for determining the sling for tripod hoisting according to claim 1, characterized in that: In step S1, the front support rod mounting hole is connected to the front support rod mounting position on the rotating platform, and the rear tie rod assembly hole is connected to the rear tie rod mounting position on the rotating platform.

6. A method for determining a sling for tripod hoisting according to claim 1, characterized in that: In step S2, the distance s1 between the front strut mounting position and the rear tie rod mounting position is measured.

7. A method for determining a sling for a tripod hoisting according to claim 1, characterized in that: In step S3, the distance s1 between the front strut installation position and the rear tie rod installation position on the slewing platform in step S2 is equal to the distance s2 from the front strut installation hole to the rear tie rod assembly hole, the horizontal distance s3 and the vertical distance d1 from the center of the lower lifting ear to the center of the installation hole are measured, and the angle A between the sling and the vertical direction is determined by tanA=s3 / (s2-d1). The sling length s4 can be obtained by the angle A and the horizontal distance s3 from the center of the lower lifting ear to the installation hole, that is, s4=s3 / sinA.

8. A method for determining a sling for tripod hoisting according to claim 1, characterized in that: In step S4, the center of gravity position of the rear tie rod, the weight of the rear tie rod g1, the length of the rear tie rod s5, and the position from the center of gravity to the center of the assembly hole s6 are confirmed, and the gravity g2 from the center of gravity position of the rear tie rod to the center of the assembly hole is calculated, F1*s5=g2*(s5-s6), where F1 is the pulling force of the sling on the rear tie rod in the vertical direction.

9. A method for determining a sling for tripod hoisting according to claim 8, characterized in that: In step S5, the carrying capacity of the sling is F=F1*cosA.

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