A hoisting method using a gantry crane to hoist a front section of a slewing platform

Abstract

The present application provides a kind of hoisting method using gantry crane to hoist rotary platform, when the distance between first lifting lug and second lifting lug is less than the rated length between first hook and second hook, first hook and independent hook need to be used to cooperate to hoist rotary platform;In order to keep the balance of beam double hook, the maximum stress difference between first hook and second hook is set, counterweight is set according to the maximum stress difference, negative load is generated on second hook by counterweight, so that the stress of first hook and second hook is close, and then the balance of beam double hook is realized;At the same time, by setting the maximum stress difference, the weight of counterweight generates negative load on second hook for balancing, and the calculation method is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rotary platform hoisting, in particular to a hoisting method for hoisting a front section of a rotary platform by a gantry crane. BACKGROUND

[0002] The rotary platform of a crane is a large equipment, and the rotary platform needs to be hoisted during installation. The gantry point includes a beam double hook and an independent hook. The prior art hoists the rotary platform by the beam double hook and the independent hook. For example, a patent document with the application number 201310003481.7 and the publication date of May 1, 2013 discloses a hoisting process for a super-large cylinder section, which includes the following steps: 1. a gantry crane is connected to an upper trolley and a lower trolley at both ends; 2. the upper trolley and the lower trolley are connected to a plurality of lifting points arranged on the upper and lower surrounding walls of the cylinder section, and the gantry crane is used to hoist the cylinder section; 3. the cylinder section is vertically arranged in the air; 4. the cylinder section is lowered to be close to the ground; 5. the cylinder section is horizontally rotated by 180° around the main hook of the upper trolley; 6. the cylinder section is lifted and hoisted off the ground; 7. the cylinder section is leveled; 8. the main hook of the upper trolley and the auxiliary hook of the lower trolley are lowered, and the cylinder section is placed on a total assembly platform, thereby completing the turning and loading of the cylinder section.

[0003] However, the distance between the two lifting points of rotary platforms of different specifications is different. The distance between the first hook and the second hook of the beam double hook is limited. When the distance between the two lifting points of the rotary platform is less than the minimum distance between the first hook and the second hook, the two lifting points of the rotary platform cannot be connected to the first hook and the second hook at the same time, so that the first hook and the second hook cannot work within the stress difference range. SUMMARY

[0004] The present application provides a hoisting method for hoisting a front section of a rotary platform by a gantry crane, which sets the maximum stress difference between the first hook and the second hook, sets a counterweight according to the maximum stress difference, generates a load on the second hook by the counterweight, and makes the stress of the first hook and the second hook close, thereby balancing the stress of the beam double hook.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a hoisting method for hoisting a front section of a rotary platform by a gantry crane, which includes the following steps:

[0006] S1, presetting the maximum stress difference K between the first hook and the second hook in the beam double hook.

[0007] S2, determining the weight of the front section of the rotary platform to be hoisted.

[0008] S3, calculating the stress F1 of the first hook when the first hook and the independent hook hoist the front section of the rotary platform at the same time.

[0009] S4、determining the value of F2, F2 being the minimum load required for the second hook to maintain the force balance of the first hook and the second hook.

[0010] S5, the first hook is moved to one side of the front section of the rotating platform and connected to the first hook ear through the steel wire rope; the independent hook is moved to the other side of the front section of the rotating platform and connected to the second hook ear through the steel wire rope.

[0011] S6, a counterweight with a weight of F2-F1 is hung on the second hook ear.

[0012] S7, the gantry crane horizontally lifts the front section of the rotating platform from the support surface.

[0013] The above method needs to use the first hook and the independent hook to cooperate to lift the rotating platform when the distance between the first hook ear and the second hook ear is less than the rated length between the first hook and the second hook; in order to maintain the force balance of the beam double hook, the maximum force difference between the first hook and the second hook is set, the counterweight is set according to the maximum force difference, the load on the second hook is generated through the counterweight, the forces of the first hook and the second hook are close, and the force balance of the beam double hook is realized; at the same time, through the setting of the maximum force difference, the counterweight with a weight in the interval of F2-F1 generates a load on the second hook for balance, and the calculation method is simple.

[0014] Further, a third hook ear is arranged on one side of the first hook ear and a fourth hook ear is arranged on one side of the second hook ear in the horizontal direction; the first hook ear and the second hook ear are symmetrically arranged about the midpoint of the front section of the rotating platform, and the third hook ear and the fourth hook ear are symmetrically arranged about the midpoint of the front section of the rotating platform.

[0015] The above arrangement improves the stability of the rotating platform during lifting by setting the third hook ear and the fourth hook ear.

[0016] Further, S5 further comprises: the first hook is connected to the third hook ear through the steel wire rope; and the independent hook is connected to the fourth hook ear through the steel wire rope.

[0017] The above method connects the first hook to the first hook ear and the third hook ear, and connects the independent hook to the second hook ear and the fourth hook ear; in this way, the rotating platform is not easy to sway during lifting, and the stability is good.

[0018] Further, S7 further comprises the following steps:

[0019] S8, after the front section of the rotating platform is horizontally lifted to a preset height, S9 is performed.

[0020] S9, the independent hook is raised and the first hook is lowered, so that the front section of the rotating platform is turned to be perpendicular to the support surface.​​

[0021] S10, the gantry crane drives the independent hook and the first hook to descend at the same time, and the front section of the rotary platform after overturning is lowered to the support surface.

[0022] S11, the steel wire rope connected with the first hook is separated from the first lifting lug and the third lifting lug.

[0023] S12, the first hook is moved to the direction close to the independent hook.

[0024] S13, the steel wire rope connected with the first hook is connected with the first lifting lug and the third lifting lug again from the side of the independent hook away from the front section of the rotary platform.

[0025] S14, the gantry crane drives the independent hook to rise first, and then drives the first hook to rise, the rising amplitude of the first hook is greater than that of the independent hook, so that the front section of the rotary platform is overturned by 180° relative to the initial position.

[0026] The above method overturns the rotary platform after lifting the rotary platform horizontally, which is convenient for subsequent installation; the height of the independent hook is raised, and the height of the first hook is lowered, so that one side of the rotary platform rotates relative to the other side of the rotary platform, and the rotary platform is overturned for the first time; then the rotary platform is lowered to the support surface, and the support surface supports the rotary platform, which has good stability; then the first hook is moved and then connected with the first lifting lug and the third lifting lug, so as to avoid the interference caused by connecting the steel wire rope with the first lifting lug and the third lifting lug from above the rotary platform, and then the independent hook and the first hook are raised, the rotary platform currently supported by the support surface is lifted at the same time, and the rotary platform is overturned for the second time, so that the rotary platform is overturned by 180° relative to the initial state. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a side view of the rotary platform in the application.

[0028] Figure 2 It is a top view of the rotary platform in the application.

[0029] Figure 3 It is a schematic view of the rotary platform in the application.

[0030] Figure 4 It is a schematic view of the rotary platform in the application.

[0031] Figure 5 It is a schematic view of the rotary platform in the application.

[0032] Figure 6 It is a flowchart of the application.

[0033] Figure 7Figure 1 is a schematic diagram of the connection between the double hooks of the cross beam and the independent hook and the rotary platform and the counterweight in the present application. DETAILED DESCRIPTION

[0034] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0035] As shown in Figure 1, a hoisting method for hoisting the front section of a rotary platform using a gantry crane, comprising the following steps: Figures 1-7

[0036] S1, preset the maximum force difference K between the first hook 21 and the second hook 22 of the double hooks 2 of the cross beam; a first lifting lug 11 and a third lifting lug 13 are arranged on one side of the rotary platform 1 in the horizontal direction, and a second lifting lug 12 and a fourth lifting lug 14 are arranged on the other side of the rotary platform 1 in the horizontal direction; the first lifting lug 11 and the second lifting lug 12 are symmetrically arranged about the midpoint of the front section of the rotary platform 1, and the third lifting lug 13 and the fourth lifting lug 14 are symmetrically arranged about the midpoint of the front section of the rotary platform 1. The stability of the lifting of the rotary platform 1 is improved by arranging the third lifting lug 13 and the fourth lifting lug 14.

[0037] S2, determine the weight of the front section of the rotary platform 1 to be hoisted.

[0038] S3, calculate the force F1 of the first hook 21 when the first hook 21 and the independent hook 3 simultaneously hoist the front section of the rotary platform 1.

[0039] S4, determine the value of F2 by F2=F1-K, F2 is the minimum load required to keep the force balance of the first hook 21 and the second hook 22.

[0040] S5, the first hook 21 moves to one side of the front section of the rotary platform 1 and is connected to the first lifting lug 11 and the third lifting lug 13 through a steel wire rope; the independent hook 3 moves to the other side of the front section of the rotary platform 1 and is connected to the second lifting lug 12 and the fourth lifting lug 14 through a steel wire rope. The first hook 21 and the independent hook 3 are connected to two lifting lugs respectively; in this way, the rotary platform 1 is not easy to sway when it is lifted, and the stability is good.

[0041] S6, hang the counterweight 4 with a weight of F2-F1 on the second lifting lug 12.

[0042] S7, the gantry crane horizontally hoists the front section of the rotary platform 1 from the supporting surface.

[0043] S8, after the front section of the rotary platform 1 is hoisted horizontally to the preset height, proceed to S9.

[0044] S9, the independent hook 3 rises and the first hook 21 descends, so that the front section of the rotary platform 1 is turned perpendicular to the supporting surface.

[0045] ​S10, the gantry crane drives the independent hook 3 and the first hook 21 to descend at the same time, and the front section of the rotating platform 1 after overturning is lowered to the support surface.

[0046] S11, the steel wire rope connected with the first hook 21 is separated from the first lifting lug 11 and the third lifting lug 13.

[0047] S12, the first hook 21 is moved to the direction close to the independent hook 3.

[0048] S13, the steel wire rope connected with the first hook 21 is connected with the first lifting lug 11 and the third lifting lug 13 again from the side of the independent hook 3 away from the front section of the rotating platform 1.

[0049] S14, the gantry crane drives the independent hook 3 to rise first, and then drives the first hook 21 to rise, the rising amplitude of the first hook 21 is greater than that of the independent hook 3, so that the front section of the rotating platform 1 is overturned by 180° relative to the initial position.

[0050] When the distance L1 between the first lifting lug 11 and the second lifting lug 12 is less than the rated length L2 between the first hook 21 and the second hook 22, the first hook 21 needs to be used in cooperation with the independent hook 3 to lift the rotating platform 1; in order to maintain the balance of the beam double hook 2, the maximum force difference between the first hook 21 and the second hook 22 is set, the counterweight 4 is set according to the maximum force difference, the counterweight 4 generates a load on the second hook 22, so that the forces of the first hook 21 and the second hook 22 are close, and the balance of the beam double hook 2 is realized; at the same time, through the setting of the maximum force difference, the counterweight 4 with a weight in the interval F2~F1 generates a load on the second hook 22 for balance, and the calculation method is simple.

[0051] After the rotating platform 1 is lifted horizontally, the rotating platform 1 is overturned, which is convenient for subsequent installation; by rising the height of the independent hook 3 and lowering the height of the first hook 21, one side of the rotating platform 1 is rotated relative to the other side of the rotating platform 1, and the rotating platform 1 is overturned for the first time; then the rotating platform 1 is lowered to the support surface, and the rotating platform 1 is supported by the support surface, which has good stability; then the first hook 21 is moved and connected with the first lifting lug 11 and the third lifting lug 13 again, which avoids the interference caused by connecting the steel wire rope with the first lifting lug 11 and the third lifting lug 13 from above the rotating platform 1, and then the independent hook 3 and the first hook 21 are raised, the rotating platform 1 currently on the support surface is lifted, and the rotating platform 1 is overturned for the second time, so that the rotating platform 1 is overturned by 180° relative to the initial state.

Claims

1. A method of hoisting a gantry crane slewing platform front section using a portal crane, characterized in that: The method comprises the following steps: S1, presetting a maximum force difference K between a first hook and a second hook in a double-hook cross beam; S2, determining the weight of a front section of a hoisting rotary platform to be hoisted; S3, calculating the force F1 of the first hook when the first hook and the independent hook simultaneously hoist the front section of the hoisting rotary platform; S4, by determining a value of F2, F2 being a minimum load required for the second hook to maintain a force balance of the first and second hooks; S5, moving the first hook to one side of the front section of the rotary platform and connecting the first hook with the first lifting lug through a steel wire rope; moving the independent hook to the other side of the front section of the rotary platform and connecting the independent hook with the second lifting lug through a steel wire rope; S6, hanging a counterweight with a weight of F2~F1 on the second lifting lug; S7, horizontally hoisting the front section of the rotary platform from a support surface by the gantry crane.

2. The method of claim 1, wherein the method further comprises: In the horizontal direction, a third lifting lug is arranged on one side of the first lifting lug, and a fourth lifting lug is arranged on one side of the second lifting lug; the first lifting lug and the second lifting lug are symmetrically arranged about the midpoint of the front section of the rotary platform, and the third lifting lug and the fourth lifting lug are symmetrically arranged about the midpoint of the front section of the rotary platform.

3. The method of claim 2, wherein the method further comprises: S5 further comprises: connecting the first hook with the third lifting lug through a steel wire rope; and connecting the independent hook with the fourth lifting lug through a steel wire rope.

4. The method of claim 3, wherein the method further comprises: S7 further comprises the following steps: S8, after horizontally hoisting the front section of the rotary platform to a preset height, performing S9; S9, raising the independent hook and lowering the first hook, so that the front section of the rotary platform is flipped to be perpendicular to the support surface; S10, simultaneously lowering the independent hook and the first hook by the gantry crane, so that the flipped front section of the rotary platform is lowered to the support surface; S11, disconnecting the steel wire rope connected with the first hook from the first lifting lug and the third lifting lug; S12, moving the first hook towards the independent hook; S13, reconnecting the steel wire rope connected with the first hook with the first lifting lug and the third lifting lug from the side away from the front section of the rotary platform of the independent hook; S14, first driving the independent hook to rise by the gantry crane, and then driving the first hook to rise, the rising amplitude of the first hook being greater than the rising amplitude of the independent hook, so that the front section of the rotary platform is flipped by 180° relative to the initial position.

Images