A method for determining a sling for a tripod

Abstract

The present application provides a kind of girdle determination method for tripod hoisting, including tripod and girdle, the tripod includes front support rod and rear pull rod, the tripod is set in crane slewing platform, the girdle carrying capacity and girdle length are calculated, specific steps include: S1 preset slewing platform front support rod installation position and rear pull rod installation position, front support rod is provided with lower lifting lug and mounting hole, rear pull rod is provided with girdle mounting hole and assembly hole;S2 confirms front support rod installation position and rear pull rod installation position parameter;S3 confirms the parameter between lower lifting lug and mounting hole, obtains girdle length;S4 confirms rear pull rod parameter;S5 confirms the parameter between girdle and front support rod and rear pull rod, obtains girdle carrying capacity, and the girdle carrying capacity and length are calculated conveniently and accurately.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crane tripod equipment, and particularly relates to a method for determining a lifting belt for lifting a tripod. BACKGROUND

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

[0003] A lifting method for a marine crane is disclosed in a patent document with the patent application number 202011312365.X and the publication date of January 10, 2023. Three lifting points not in the same plane are selected, and the center of gravity of the base is calculated. The lifting points for lifting are determined. Lifting ears are connected to the lifting points. The lifting of the base is realized by connecting the lifting ears with the steel wire ropes of the crane. The lifting of the rotating platform assembly is realized. Three lifting points not in the same plane are selected, and the center of gravity of the rotating platform assembly is calculated. The lifting points for lifting are determined. Lifting ears are connected to the lifting points on the left side. The lifting of the base is realized by connecting the lifting points on the left side and the right side with the steel wire ropes of the crane. The lifting of the tripod is realized. Three lifting points not in the same plane are selected, and the center of gravity of the tripod is calculated. The lifting points for lifting are determined. The lifting of the tripod is realized by connecting the top lifting points and the lower lifting points with the steel wire ropes, and all the upper ends of the steel wire ropes are connected to the crane. The lifting of the crane is realized. The lifting of the boom is realized. The lifting points of the crane components are accurately and conveniently selected. The stress of the components during lifting is reasonable.

[0004] In the above document, the front support rod and the rear pull rod of the tripod are connected by a support rod. During lifting, 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 lifted by a large lifting device to realize installation. The operation is complex and the cost is high. When a flexible lifting belt is used to connect the front support rod and the rear pull rod, the bearing tension of the lifting belt needs to be considered during the lifting of the tripod to prevent the lifting belt from breaking and affecting the reliability of the lifting of the tripod. Therefore, the length and bearing capacity of the lifting belt need to be determined to meet the lifting requirements. SUMMARY

[0005] The present application provides a method for determining a lifting belt for lifting a tripod. The bearing capacity and length of the lifting belt are calculated to ensure the reliability of lifting.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a method for determining a lifting belt for lifting a tripod, the tripod including a front support rod and a rear pull rod, the front ends of the front support rod and the rear pull rod being hinged, the rear ends of the front support rod and the rear pull rod being connected by a flexible lifting belt, and the specific steps including:

[0007] S1 has preset installation positions for the front support rod and the rear tie rod of the slewing platform. The front support rod is equipped with a lower lifting lug and a mounting hole, and the rear tie rod is equipped with a lifting lug mounting hole and an assembly hole.

[0008] S2 determines the distance between the mounting holes on the front strut and the assembly holes on the rear tie rod based on the installation position on the slewing platform;

[0009] 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, as well as the distance between the lower lifting lug and the mounting hole;

[0010] S4 confirms the rear tie rod parameters; the rear tie rod parameters include the rear tie rod weight, center of gravity, and length;

[0011] S5 determines the sling load-bearing capacity based on the rear tie rod parameters.

[0012] The above setup involves first raising the front support rod and then attaching flexible slings to the rear ends of both the front and rear support rods. Before connecting the front and rear support rods with slings, the length of the slings can be easily determined by considering the distance between the mounting holes on the front support rod and the assembly holes on the rear support rod, as well as the distance between the lower lifting lug and the mounting holes. Then, based on the weight and center of gravity of the rear support rod and its length, the load-bearing capacity of the slings can be calculated using the principle of torque balance. Precise calculation of the slings' load-bearing capacity ensures that they can withstand the maximum load during actual hoisting. By horizontally raising the tripod and allowing the weight of the rear support rod to keep the slings taut without exceeding the required installation length, overloading can prevent sling breakage or hoisting failure, thus improving the stability and safety of the hoisting process. Furthermore, calculating the required sling length reduces the time spent adjusting the hoisting position on-site, improving installation efficiency.

[0013] Furthermore, step S3 also includes: determining the angle between the sling and the straight line containing the mounting hole on the front support rod and the assembly hole on the rear tie rod based on the distance between the mounting hole on the front support rod and the assembly hole on the rear tie rod, as well as the distance between the lower lifting lug and the mounting hole, and then obtaining the length of the sling.

[0014] The above settings are based on the angle between the sling and the straight line containing the mounting holes on the front support rod and the assembly holes on the rear tie rod. The length of the sling is determined based on this angle, making the calculation convenient.

[0015] Furthermore, step S5 also includes: determining the load-bearing capacity of the sling based on the parameters of the rear tie rod and the angle between the sling and the straight line containing the mounting holes on the front support rod and the assembly holes of the rear tie rod.

[0016] With the above settings, the load-bearing capacity of the entire sling can be calculated by calculating the vertical component of the force in the sling through the included angle.

[0017] Further, the tripod further comprises a pulley frame, one end of the pulley frame is connected with the front support rod, and the other end of the pulley frame is connected with the rear pull rod.

[0018] The above arrangement is that the front support rod and the rear pull rod are connected through the pulley frame, so that the rear pull rod and the front support rod are rotatably connected.

[0019] Further, in step S1, the front support rod mounting hole is connected with the front support rod mounting position on the rotary platform, and the rear pull rod assembly hole is connected with the rear pull rod mounting position on the rotary platform.

[0020] The above arrangement is that the front support rod is provided with the mounting hole, and the front support rod is connected with the rotary platform through the mounting hole, and the rear pull rod is provided with the assembly hole, and the rear pull rod is connected with the rotary platform through the assembly hole.

[0021] Further, in step S2, the distance s1 between the front support rod mounting position and the rear pull rod mounting position on the rotary platform is measured.

[0022] The above arrangement is that the distance s1 between the front support rod mounting position and the rear pull rod mounting position on the rotary platform is measured, the required distance between the mounting hole and the assembly hole is obtained, and thus a basis for calculating the length of the sling in the next step S3 is provided.

[0023] Further, in step S3, the distance s1 between the front support rod mounting position and the rear pull rod mounting position on the rotary platform in step S2 is equal to the distance s2 from the front support rod mounting hole to the rear pull rod assembly hole, the horizontal distance s3 from the center of the lower lifting lug to the center of the mounting hole and the vertical distance d1 are measured, the angle A between the sling and the vertical direction is determined through tanA=s3 / (s2-d1), and the length s4 of the sling is obtained through the angle A and the horizontal distance s3 from the center of the lower lifting lug to the center of the mounting hole, that is, s4=s3 / sinA.

[0024] The above arrangement is that, in step S2, s1 is obtained, the distance s2 from the front support rod mounting hole to the rear pull rod assembly hole is equal to s1, the horizontal distance s3 from the center of the lower lifting lug to the center of the mounting hole is measured, 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 lifting lug to the center of the mounting hole is equal to the horizontal distance from the center of the lower lifting lug to the center of the assembly hole, the vertical distance d1 from the center of the lower lifting lug to the center of the mounting hole is measured, the vertical distance from the assembly hole to the center of the lower lifting lug is obtained through s2-d1, the angle A between the sling and the vertical direction is determined through tanA=s3 / (s2-d1), and the length s4 of the sling is s3 / sinA, and the solving method is reliable and simple.

[0025] Further, in step S4, after confirming the rear pull rod gravity center position, the rear pull rod weight g1, the rear pull rod length s5, and the gravity center to assembly hole circle center position s6, the rear pull rod gravity center position to assembly hole circle center position gravity g2 is calculated, F1*s5=g2*(s5-s6), and the F1 is the vertical direction of the sling to the rear pull rod tension.

[0026] The above setting, through the three-dimensional model, the gravity center position of the rear pull rod is obtained, when the rear pull rod is hoisted horizontally, the pulley frame mainly bears the gravity on the left side of the gravity center, and the sling mainly bears the gravity on the right side of the gravity center, so that the rear pull rod weight g2, the rear pull rod length s5, and the gravity center to assembly hole circle center position s6 need to be calculated, since the front support rod is in a balanced state through the lifting appliance, the rear pull rod is in a balanced state relative to the pulley mounting frame under the action of the sling tension, and according to the principle of moment balance, the vertical force of the sling can be obtained.

[0027] Further, in step S5, the bearing force of the sling F=F1*cosA.

[0028] The above setting, the sling is inclined, and the bearing force of the sling is obtained by multiplying the vertical direction of the sling to the rear pull rod tension F1 and the included angle A. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole structure schematic diagram of the present application.

[0030] Figure 2 It is Figure 1 An enlarged view of A in FIG. 1.

[0031] Figure 3 It is a force analysis schematic diagram of the assembly hole in the present application.

[0032] BRIEF DESCRIPTION OF DRAWINGS: 1-front support rod; 11-mounting hole; 12-lower lifting lug; 2-rear pull rod; 20-lifting lug mounting hole; 21-gravity center position; 22-assembly hole; 3-pulley frame; 4-sling. DETAILED DESCRIPTION

[0033] As Figures 1-3 shown, a sling determination method for a tripod hoisting, the tripod includes a front support rod 1 and a rear pull rod 2, the front support rod 1 and the rear pull rod 2 are connected through a flexible sling 4, the tripod is arranged on a crane slewing platform, the length and bearing force of the sling are determined between the hoisting tripods, and the specific steps include:

[0034] S1, presetting the front support rod 1 mounting position and the rear pull rod 2 mounting position on the slewing platform, the front support rod 1 is provided with a lower lifting lug 12 and a mounting hole 11, and the rear pull rod 2 is provided with a lifting lug mounting hole 20 and an assembly hole 22;

[0035] 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 based on the installation position on the slewing platform;

[0036] S3 confirms the distance between the lower lifting lug 12 and the mounting hole 11, and calculates the sling length based on the distance between the mounting hole 11 on the front support rod 1 and the assembly hole 22 on the rear tie rod 2, as well as the distance between the lower lifting lug 12 and the mounting hole 22.

[0037] S4 confirms the parameters of the rear tie rod 2; the rear tie rod parameters include the rear tie rod weight, center of gravity, and length;

[0038] S5 determines the sling load-bearing capacity based on the rear tie rod parameters.

[0039] like Figures 1-2 As shown, the tripod also includes a pulley bracket 3. One end of the pulley bracket 3 is connected to the front support rod 1, and the other end of the pulley bracket 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 bracket 3, so that the rear pull rod 2 and the front support rod 1 are rotatably connected.

[0040] In step S1, the mounting hole 11 of the front support rod 1 is connected to the mounting position of the front support rod 1 on the rotary 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 rotary platform. The front support rod 1 is provided with a mounting hole 11 and is connected to the rotary platform through the mounting hole 11. The rear tie rod 2 is provided with an assembly hole 22 and is connected to the rotary platform through the assembly hole 22.

[0041] In step S2, the distance s1 between the installation positions of the front support rod 1 and the rear tie rod 2 is measured. By measuring the distance between the installation positions of the front support rod 1 and the rear tie rod 2 on the rotating platform, the required distance between the mounting hole 11 and the assembly hole 22 can be obtained, thus providing a basis for calculating the sling length in the next step S3.

[0042] In step S3, the distance s1 between the installation position of the front support rod 1 and the installation position of the rear pull rod 2 obtained in step S2 is equal to the distance s2 between the installation hole 11 of the front support rod 1 and the assembly hole 22 of the rear pull rod 2, the horizontal distance s3 from the center of the lower lifting lug 12 to the center of the installation hole 11 and the vertical distance d1 are measured, and the included angle A between the sling and the vertical direction is determined by tan A = s3 / (s2-d1). The length s4 of the sling can be obtained by the included angle A and the horizontal distance s3 from the center of the lower lifting lug 12 to the center of the installation hole 11, that is, s4 = s3 / sin A. Since s1 is obtained in step S2, the distance s2 between the installation hole 11 of the front support rod 1 and the assembly hole 22 of the rear pull rod 2 is s1, and the horizontal distance s3 from the center of the lower lifting lug 12 to the center of the installation hole 11 is measured. Since the center of the installation hole 11 and the center of the assembly hole 22 are on the same horizontal line, the horizontal distance s3 from the center of the lower lifting lug 12 to the center of the installation hole 11 is equal to the horizontal distance from the center of the lower lifting lug 12 to the center of the assembly hole 22. The vertical distance from the center of the lower lifting lug 12 to the center of the installation hole 11 is measured, and the vertical distance from the center of the assembly hole 22 to the center of the lower lifting lug 12 is obtained by s2-d1. The included angle A between the sling and the vertical direction is determined by tan A = s3 / (s2-d1), and the length s4 of the sling is s3 / sin A.

[0043] As shown in Figures 1-3 In step S4, the center of gravity position 21 of the rear pull rod 2, the weight g1 of the rear pull rod 2, the length s5 of the rear pull rod 2, and the distance s6 from the center of gravity to the center of the assembly hole 22 are confirmed, and the gravity g2 from the center of gravity position 21 of the rear pull rod 2 to the center of the assembly hole 22 is calculated, that is, F1*s5 = g2*(s5-s6). F1 is the vertical pulling force of the sling on the rear pull rod 2. The center of gravity position 21 of the rear pull rod 2 is obtained by the three-dimensional model. When the rear pull rod 2 is horizontally hoisted, the pulley frame 3 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, the weight g2 of the rear pull rod 2, the length s5 of the rear pull rod 2, and the distance s6 from the center of gravity to the center of the assembly hole 22 need to be calculated. According to the principle of moment balance, the gravity direction of the rear pull rod 2 is vertically downward. In order to enable the sling to bear the weight of the rear pull rod 2, the vertical pulling force F1 of the sling on the rear pull rod 2 must be at least equal to the gravity on the right side of the center of gravity position 21 of the rear pull rod 2. Therefore, F1*s5 = g2*(s5-s6).

[0044] In step S5, the bearing capacity F of the sling is F1 / cos A, and the sling is inclined. The bearing capacity of the sling is obtained by multiplying the vertical pulling force F1 of the sling on the rear pull rod 2 by the included angle A, that is, F = F1*cos A.

[0045] The working principle of the present application is as follows: when the front support rod 1 and the rear pull rod 2 are hoisted, the front support rod 1 is first pulled up, then the rear end of the front support rod 1 and the rear pull rod 2 is provided with a flexible sling 4, before the front support rod 1 and the rear pull rod 2 are connected by the sling 4, the length of the sling 4 is 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 lug 12 and the mounting hole 22, then according to the gravity and the center of gravity of the rear pull rod 2 and the length of the rear pull rod 2, the bearing capacity of the sling 4 is calculated according to the principle of moment balance, and through the accurate calculation of the bearing capacity of the sling 4, it can be ensured that the sling 4 can bear 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 4 is in a taut state and also does not exceed the length setting required by the installation, thereby avoiding the breakage of the sling 4 or the failure of hoisting due to overloading, improving the stability and safety of hoisting, on the other hand, the required length of the sling 4 is calculated, which can reduce the time of adjusting the hoisting position on site and improve the hoisting installation efficiency.

Claims

1. A method for determining a sling for lifting a tripod, the tripod comprising a front strut and a rear strut, the front strut and the rear strut being hingedly connected at their front ends, 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 the following steps. S1, presetting the front support rod mounting position and the rear pull rod mounting position on the slewing platform, the front support rod being provided with a lower sling lug and a mounting hole, and the rear pull rod being provided with a sling lug mounting hole and an assembly hole; S2, determining the distance between the upper mounting hole of the front support rod and the assembly hole of the rear pull rod according to the mounting positions on the slewing platform; S3, confirming the distance between the lower sling lug and the mounting hole, and deriving the sling length according to the distance between the upper mounting hole of the front support rod and the assembly hole of the rear pull rod and the distance between the lower sling lug and the mounting hole; S4, confirming the rear pull rod parameters, the rear pull rod parameters including the gravity, the center of gravity and the length of the rear pull rod; 2. The method of claim 1, wherein: S5, determining the sling bearing capacity according to the rear pull rod parameters.

3. The method of claim 2, wherein: In step S3, the angle between the sling and the straight line where the upper mounting hole of the front support rod and the assembly hole of the rear pull rod are located is determined according to the distance between the upper mounting hole of the front support rod and the assembly hole of the rear pull rod and the distance between the lower sling lug and the mounting hole, and the sling length is derived. In step S5, the sling bearing capacity is determined according to the rear pull rod parameters and the angle between the sling and the straight line where the upper mounting hole of the front support rod and the assembly hole of the rear pull rod are located.

4. The method of claim 1, wherein: Through the above arrangement, the vertical component force of the sling can be calculated by the angle, and the bearing capacity of the entire sling can be calculated.

5. The method of claim 1, wherein: The tripod further includes a pulley frame, one end of the pulley frame being connected with the front support rod, and the other end of the pulley frame being connected with the rear pull rod.

6. The method of claim 1, wherein: In step S1, the front support rod mounting hole is connected with the front support rod mounting position on the slewing platform, and the rear pull rod assembly hole is connected with the rear pull rod mounting position on the slewing platform. In step S2, the distance s1 between the front support rod mounting position and the rear pull rod mounting position is measured.

7. The method for determining the sling of the tripod according to claim 1, characterized in that:

8. The method of claim 1, wherein: In step S3, the distance s1 between the front support rod mounting position and the rear pull rod mounting position in step S2 is equal to the distance s2 between the front support rod mounting hole and the rear pull rod assembly hole, the horizontal distance s3 and the vertical distance d1 between the center of the lower sling lug and the center of the mounting hole are measured, the angle A between the sling and the vertical direction is determined through tan A = s3 / (s2-d1), and the sling length s4 can be derived through the angle A and the horizontal distance s3 between the center of the lower sling lug and the center of the mounting hole, i.e. s4 = s3 / sin A.

9. The method of claim 8, wherein: In step S4, the center of gravity position of the rear pull rod, the weight g1 of the rear pull rod, the length s5 of the rear pull rod and the distance s6 between the center of gravity and the center of the assembly hole are confirmed, the gravity g2 from the center of gravity position of the rear pull rod to the center of the assembly hole is calculated, F1*s5 = g2*(s5-s6), and F1 is the vertical pulling force of the sling on the rear pull rod. In step S5, the bearing capacity F of the sling is F = F1*cos A.

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