A calculation method for single hook lifting of large equipment

Abstract

The present invention relates to the technical field of equipment lifting and hoisting, and discloses a single hook lifting calculation method for large equipment. The specific steps are: step one, set up known conditions; step two, establish a functional relationship based on the known conditions; step three, enter the known condition information into an Excel table of known information; step four, adjust the h value in combination with the existing sling information; step five, select a suitable h value based on the choice of "matching the short with the long". For single hook four-point lifting, the known information such as the center of gravity and the lifting point are converted into parameters in the space coordinate system, and the hook height is set as the independent variable to calculate the length of the slings at the four lifting points and the theoretical tension of the slings. This method uses a large amount of calculation at one time to enter its calculation logic process into an EXCEL table. After that, whenever this type of lifting is encountered, it is only necessary to enter the known conditions according to the requirements of the table to quickly obtain the lengths of the four slings and the forces on each sling.

Description

Technical Field

[0001] The invention relates to the technical field of equipment lifting and hoisting, and in particular to a single-hook lifting calculation method for large equipment. Background Art

[0002] Taking the overall hoisting of the front and rear beams as an example, the existing technology adopts single hook four-point hoisting. The characteristics of this hoisting form are: the hoisted heavy object can only be rotated as a whole along the vertical axis, and the posture cannot be adjusted in other directions. In order to ensure that the hoisting posture is controlled in a better state for convenient installation.

[0003] Original method: Generally, when the weight center and the lifting point are known, CAD or 3D drawing is used in combination with the sling list to preliminarily determine the length of the sling, and the theoretical force of each sling is calculated by drawing, which must not be greater than the rated tension of the sling. This method requires separate drawing simulation for different weight centers, lifting points and different rigging lengths, and it is also necessary to check that the tension meets the requirements. Duplication of work wastes time and energy. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a single-hook hoisting calculation method for large equipment.

[0005] To achieve the above object, the present invention provides the following technical solution: a single hook lifting calculation method for large equipment, which more accurately calculates the length and load requirements of single hook four-point lifting by establishing coordinate systems multiple times and solving simple multivariate multivariate equations. The specific steps are as follows:

[0006] Step 1: Establish known conditions: the four hanging points, the weight center of gravity, and the opening of the mountain hook are known;

[0007] Step 2: Based on the known conditions, establish a coordinate system according to the above requirements and establish a functional relationship;

[0008] Step 3: Enter the known condition information into the Excel table of known information, where the height h is set to an initial value;

[0009] Step 4: Adjust the h value based on the existing sling information (generally give priority to the value of the shortest sling)

[0010] Step 5. According to the option of "matching short with long", select the appropriate h value so that the lengths and loads of the four slings can be calculated and matched with the existing slings.

[0011] The single-hook four-point lifting calculation described above is only for this form: the median vertical plane of the line connecting the two lifting points on one side coincides with the median vertical plane of the two lifting points on the other side.

[0012] Preferably, the known hoisting weight is G; the opening of the mountain hook is l; the opening of the two hanging points on the left is a; the opening of the two hanging points on the right is b; the opening of the left and right hanging points is c; the coordinates of the center of gravity are (x0, y0), the height difference of the hook head on the left and right sides is d, and the height from the left hanging point to the hook head is h;

[0013] Find the length L of the four slings of a single hook four-point sling A , L B , L C , L D And the forces F on the four slings A 、F B 、F C 、F D .

[0014] Preferably, the origin of the spatial coordinate system A is (0,0,0) with A as the origin; then the coordinates of point B are (0,a,0); and point C is The coordinates of point D are The coordinates of the center of gravity E are (x0, y0, z0); the coordinates of the hook head lifting points are

[0015] The exact length of each sling can be calculated by knowing the following conditions:

[0016]

[0017]

[0018]

[0019]

[0020] Projected from the main view. Use the left hanging point as the origin to establish a two-dimensional coordinate system

[0021] F(0,0); H(x0,h); G(c,d);

[0022]

[0023] but

[0024]

[0025] Preferably, a two-dimensional coordinate system is established by projecting vertically from the left side and onto the plane formed by the two slings on the left side.

[0026] A(0,0); B(a,0); then

[0027]

[0028] but

[0029]

[0030] Similarly, project vertically from the right side to the plane formed by the two slings on the right side to establish a two-dimensional coordinate system.

[0031] Preferably, K5 and K6 are calculated by a similar method as follows:

[0032]

[0033] but

[0034]

[0035] Calculate the length L of the four slings of the single hook four-point lifting A , L B , L C , L D And the forces F on the four slings A 、F B 、F C 、F D .

[0036] Compared with the prior art, the present invention provides a single hook lifting calculation method for large equipment, which has the following beneficial effects:

[0037] This single-hook lifting calculation method for large equipment and single-hook four-point lifting converts known information such as weight center of gravity and lifting points into parameters in the spatial coordinate system, sets the hook height as the independent variable, and calculates the length of the slings at the four lifting points and the theoretical tension of the slings. This method uses a large amount of calculation at one time to enter its calculation logic process into an EXCEL table. Whenever this type of lifting is encountered, you only need to enter the known conditions as required by the table to quickly obtain the length of the four slings and the force on each sling. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of a single-hook four-point lifting structure of the present invention;

[0039] Figure 2 This is a schematic diagram of a single-hook four-point lifting structure of the present invention;

[0040] Figure 3 It is a schematic diagram of a calculation table of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1-3 A single hook lifting calculation method for large equipment uses a method of establishing coordinate systems multiple times and using simple multivariate equations to more accurately calculate the length and load requirements of a single hook four-point lifting. The specific steps are:

[0043] Step 1: Establish known conditions: the four hanging points, the weight center of gravity, and the opening of the mountain hook are known;

[0044] Step 2: Based on the known conditions, establish a coordinate system according to the above requirements and establish a functional relationship;

[0045] Step 3: Enter the known condition information into the Excel table of known information, where the height h is set to an initial value;

[0046] Step 4: Adjust the h value based on the existing sling information (generally give priority to the value of the shortest sling)

[0047] Step 5. According to the option of "matching short with long", select the appropriate h value so that the lengths and loads of the four slings can be calculated and matched with the existing slings.

[0048] The single-hook four-point lifting calculation described above is only for this form: the median vertical plane of the line connecting the two lifting points on one side coincides with the median vertical plane of the two lifting points on the other side.

[0049] Assume that the known lifting weight is G; the gap of the mountain hook is l; the gap between the two lifting points on the left is a; the gap between the two lifting points on the right is b; the gap between the left and right lifting points is c; the coordinates of the center of gravity are (X0, y0), the height difference between the left and right hook heads is d, and the height from the left lifting point to the hook head is h;

[0050] Find the length L of the four slings of a single hook four-point sling A , L B , L C , L D And the forces F on the four slings A 、F B 、F C 、F D .

[0051] Let A be the origin of the spatial coordinate system. The origin of the coordinate system A is (0,0,0); then the coordinates of point B are (0,a,0); and point C is The coordinates of point D are The coordinates of the center of gravity E are (x0, y0, z0); the coordinates of the hook head lifting points are

[0052] The exact length of each sling can be calculated by knowing the following conditions:

[0053]

[0054]

[0055]

[0056]

[0057] Projected from the main view. Use the left hanging point as the origin to establish a two-dimensional coordinate system

[0058] F(0,0); H(x0,h); G(c,d);

[0059]

[0060] but

[0061]

[0062] From the left side and vertically projected on the surface formed by the two slings on the left side, establish a two-dimensional coordinate system, A(0,0); B(a,0); then

[0063]

[0064] but

[0065]

[0066] Similarly, project vertically from the right side to the plane formed by the two slings on the right side to establish a two-dimensional coordinate system.

[0067] Use similar methods to calculate K5 and K6 respectively:

[0068]

[0069] but

[0070]

[0071] Calculate the length L of the four slings of the single hook four-point lifting A、 L B , L C、 LD And the forces F on the four slings A、 F B 、F C 、F D .

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single hook lifting calculation method for large equipment, characterized in that: By establishing coordinate systems multiple times and solving simple multivariate equations, the length and load requirements of single hook four-point lifting are calculated. The specific steps are as follows: Step 1: Establish known conditions: the four hanging points, the weight center of gravity, and the opening of the mountain hook are known; Step 2: According to the above known conditions, establish a coordinate system and establish a functional relationship; Step 3: Enter the known conditions into the Excel table, where the height h is set to an initial value; Step 4: Adjust the h value based on the existing sling information; Step 5: Calculate the length and load of the four slings and match them with the existing slings; The calculation of single hook four-point lifting is only for this form: the median vertical plane of the line connecting the two lifting points on one side coincides with the median vertical plane of the two lifting points on the other side; Assume that the known lifting weight is G; the opening of the mountain hook is l; the opening of the two lifting points on the left is a; the opening of the two lifting points on the right is b; the opening of the left and right lifting points is c; the coordinates of the center of gravity are (X0, y0), the height difference of the hook head on the left and right sides is d, and the height from the left lifting point to the hook head is h; Find the length L of the four slings of a single hook four-point sling A、 L B、 L C、 L D And the forces F on the four slings A、 F B、 F C、 F D； Set A, B, C, and D as four hanging points, and set the origin of the spatial coordinate system A with A as the origin (0,0,0); then the coordinates of point B are (0,a,0); point C is (c, ,d); The coordinates of point D are (c, ,d); the coordinates of the center of gravity E are (x0, y0, z0); then the coordinates of the hook head lifting points are ; The exact length of each sling can be calculated by knowing the following conditions: Looking from the main view projection, establish a two-dimensional coordinate system with the left hanging point as the origin; From the left side and vertically projecting on the surface formed by the two slings on the left side, establish a two-dimensional coordinate system with A as the origin, the direction toward B as the positive direction of the X axis, and the upward direction along the surface formed by the slings as the positive direction of the Y axis; Similarly, project vertically from the right side and the plane formed by the two slings on the right side to establish a two-dimensional coordinate system; Use similar methods to calculate K5 and K6 respectively: Calculate the length L of the four slings of the single hook four-point lifting A、 L B、 L C、 L D And the forces F on the four slings A、 F B、 F C、 F D .

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