Hoisting structure for large nut mounting

Abstract

The utility model relates to nut hoisting technical field discloses a kind of hoisting structure for large nut installation, including the shell of outer layer and the sleeve of inner layer, shell and sleeve are attached and can rotate relatively, the shape of hollow portion of sleeve is consistent with the outer periphery of large nut to be installed, further including nut limiting assembly installed on sleeve, so that large nut is fixed relative to sleeve, by being provided with nut limiting assembly, it is realized to the large nut to be hoisted on the hollow portion of sleeve is fixed, to prevent the nut from sliding off in inner sleeve in the process of turning, simultaneously can drive fixed seat to make the nut fixed follow sleeve rotation, solve the technical problem of poor stability, nut is easy to fall, lifting belt is damaged due to abrasion in the nut hoisting technical scheme in prior art.

Description

Technical Field

[0001] This utility model relates to the field of nut hoisting technology, specifically a hoisting structure for assisting in the installation of large nuts. Background Technology

[0002] In existing technology, some large nuts weigh approximately 60-85 kg. Current assembly methods typically involve first elevating the lifting rod to ensure the nut doesn't interfere with the ground during rotation, then using a crane to lift the nut and lifting rod for a trial assembly, as shown in the attached diagram. Figure 1 As shown, two slings are assembled into a ring, one end of which is hung on the crane hook, and the other end is fitted onto the outer surface of the nut. The crane is adjusted to ensure that the nut is roughly aligned with the center of the boom. Multiple people work together to align the nut with the boom while manually rotating the slings to complete the assembly. During this installation process, because the nut is relatively thin, it is only held in place by the slings during lifting and rotation, resulting in poor stability and a tendency for the nut to fall. Furthermore, the slings experience sliding friction with the crane, making them prone to wear and damage. Moreover, existing automatic nut assembly technologies are mainly suitable for vertical assembly of small-sized bolts and nuts, and not for horizontal assembly of large-sized bolts and nuts.

[0003] Existing technology, patent application CN115139068A, discloses a large nut assembly / disassembly device, comprising: a lower frame for holding the nut; a lower frame bearing assembly disposed on the lower frame for supporting and rotating the nut; an upper frame located above the lower frame for fastening the nut; an upper frame bearing assembly disposed on the upper frame for fixing the nut; and a fastening rod assembly, the lower end of which is connected to the lower frame and the upper end to the upper frame, the lower frame moving up and down along the fastening rod assembly according to the size of the nut. While this prior art achieves the function of rotating large nuts, this structure is only suitable for cylindrical nuts and cannot effectively fix hexagonal nuts. Utility Model Content

[0004] In order to solve the technical problems of poor stability, easy falling of nuts, and damage to the slings due to wear in the existing nut hoisting technology, this utility model proposes a hoisting structure for the installation of large nuts.

[0005] The hoisting structure for installing and fixing large nuts includes an outer shell and an inner sleeve. The shell and sleeve are coaxially arranged and can rotate relative to each other. The shape of the hollow part of the sleeve matches the outer circumferential shape of the large nut to be installed. It also includes a nut limiting component installed on the sleeve to fix the large nut relative to the sleeve.

[0006] The aforementioned hoisting structure for installing large nuts also includes a complex array of bearing assemblies. An annular groove is provided on the inner side of the housing, and a through hole is provided on the housing at the corresponding position of the annular groove for installing the bearing assembly. The bearing assembly is used to support the outer circumferential surface of the sleeve.

[0007] The aforementioned hoisting structure for installing large nuts includes a bearing assembly consisting of a bearing fixing shaft, a bearing positioning ring, a nut, two bearings, and two bearing retaining rings. The bearing fixing shaft passes through the annular groove and is rotatably mounted on the through hole. The two bearings are mounted on the bearing fixing shaft within the annular groove, with their outer rings contacting the sleeve. The spacing is determined by the bearing positioning rings. The bearing retaining rings are positioned between the bearings and the annular groove. The bearing assembly is rotatably mounted in the corresponding through hole by the nut.

[0008] The above-mentioned hoisting structure for installing large nuts uses a fixed seat and a tightening screw as the nut limiting component. The fixed seat is set on the sleeve and is arranged symmetrically with respect to the axis of the sleeve. The fixed seat is provided with an internal threaded through hole that matches the tightening screw. The axis of the tightening screw is located in the radial direction of the sleeve.

[0009] The aforementioned lifting structure for installing large nuts further includes a plurality of first lifting rings and a plurality of second lifting rings. The second lifting rings are distributed on the circumference of the shell, and the first lifting rings are all located on one side of the shell.

[0010] The beneficial effects of this utility model include: the utility model uses a nut limiting component on the sleeve to fix the large nut to be hoisted on the hollow part of the sleeve, thereby preventing the nut from slipping out of the inner sleeve during the rotation process. At the same time, it can drive the fixing seat so that the fixed nut rotates with the sleeve. This solves the technical problems of poor stability, easy falling of nuts, and damage to the sling due to wear in the existing nut hoisting technology, while also improving the installation efficiency of large nuts. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a conventional technology for hoisting large nuts.

[0012] Figure 2 This is a schematic diagram of the hoisting structure for installing large nuts according to this utility model.

[0013] Figure 3 This is a side sectional view of the hoisting structure for installing large nuts according to this utility model.

[0014] Figure 4 This is a cross-sectional view of the bearing structure of the hoisting structure for installing large nuts according to this utility model.

[0015] Figure 5 This is a schematic diagram of Embodiment 1 of the hoisting structure of this utility model for installing large nuts.

[0016] Figure 6 This is a schematic diagram of Embodiment 2 of the hoisting structure of this utility model for installing large nuts.

[0017] Figure 7 This is a side sectional view of the housing in the hoisting structure for installing large nuts according to this utility model.

[0018] The markings in the diagram are as follows: 1-House, 2-Sleeve, 3-Bearing assembly, 31-Bearing fixing shaft, 32-Bearing positioning ring, 33-Nut, 34-Bearing, 35-Bearing retaining ring, 4-Fixing seat, 5-Annular groove, 6-Tightening screw, 7-Second lifting ring, 8-Through hole, 9-First lifting ring. Detailed Implementation

[0019] The present invention will now be described in conjunction with the accompanying drawings. Example

[0020] like Figures 2-3 The present invention is a hoisting structure for installing large nuts, including an outer shell 1 and an inner sleeve 2. The shell 1 and the sleeve 2 are coaxially arranged and can rotate relative to each other. The shape of the hollow part of the sleeve 2 matches the outer circumferential shape of the large nut to be installed. The present invention also includes a nut limiting component installed on the sleeve 2, so that the large nut is fixed relative to the sleeve 2, fitted into the sleeve 2 and rotated by the sleeve 2.

[0021] Furthermore, such as Figures 3-4 As shown, it also includes a complex array of bearing assemblies 3. An annular groove 5 is provided on the inner side of the housing 1, and a through hole 8 is provided on the housing 1 through the corresponding position of the annular groove 5 for installing the bearing assembly 3. The bearing assembly 3 is used to support the outer circumferential surface of the sleeve 2.

[0022] Furthermore, such as Figure 4 As shown, each bearing assembly 3 includes a bearing fixing shaft 31, a bearing positioning ring 32, a nut 33, two bearings 34, and two bearing retaining rings 35. The bearing fixing shaft 31 passes through the annular groove 5 and is rotatably mounted on the through hole 8, thereby limiting the position of the bearing assembly 3. The two bearings 34 are mounted on the bearing fixing shaft 31 within the annular groove 5, and their outer rings contact the sleeve 2, which transforms the sliding friction between the housing 1 and the sleeve 2 into rolling friction, improving the working efficiency of the structure and extending the service life of the material. The bearing positioning ring 32 determines the spacing. The bearing retaining rings 35 are positioned between the bearings 34 and the annular groove 5 to prevent direct friction between the bearings 34 and the housing 1 when they rotate. The bearing assembly 3 is rotatably mounted in the corresponding through hole 8 by the nut 33.

[0023] Furthermore, such as Figures 5-6As shown, the nut limiting assembly uses a fixing seat 4 and a tightening screw 6. The fixing seat 4 is set on the sleeve 2 and is arranged symmetrically with respect to the axis of the sleeve 2. The fixing seat 4 is provided with an internal thread through hole that matches the tightening screw 6. The axis of the tightening screw 6 is located in the radial direction of the sleeve 2. The fixing seat 4 and the tightening screw 6 are installed together to fix the large nut in the sleeve 2.

[0024] Furthermore, such as Figures 5-6 As shown, it also includes a plurality of first lifting rings 9 and a plurality of second lifting rings 7. The second lifting rings 7 are distributed on the circumference of the housing 1, and the first lifting rings 9 are all provided on one side of the housing 1 for the installation and lifting of the lifting mechanism.

[0025] In this embodiment, taking the trial assembly of a steam drum lifting rod and nut in a certain project as an example, the shell 1 has a first lifting ring 9 on its side and a second lifting ring 7 distributed on its circumference. The U-shaped lifting rod M200 has a total weight of 3294 kg, and the nut M200 has a net weight of 82 kg. Figure 6 As shown, firstly, the U-shaped lifting rod is placed horizontally and raised to ensure that the device will not interfere with other structures during operation. Then, the nut is placed horizontally with the screw hole facing upwards. (In this embodiment, the auxiliary device for nut assembly uses a nut with a thickness of 202mm as a reference. When the nut thickness B < 202mm, a shim with a thickness of (202-B) / 2 needs to be placed under the nut; when the nut thickness B > 202mm, a shim with a thickness of (B-202) / 2 needs to be placed under the support leg. The above measures ensure that the nut and sleeve 2 are firmly fixed during installation.) Next, the entire lifting structure is lifted horizontally by the first lifting ring 9. The structure is manually fitted over the nut, and the top screw 6 on the fixing seat 4 is tightened to prevent the nut from slipping out of the sleeve 2 during the rotation. Then, the lifting mechanism lifts the second lifting ring 7 to rotate the nut by 90°. The operator and the crane work together to adjust the spatial position of the nut to align with the structure to be installed, and rotate the top screw 6 on the fixing seat 4 to rotate the large nut and complete the installation.

[0026] Compared with the prior art, the hoisting structure for installing large nuts provided by this utility model sets the outer shell 1 and the inner sleeve 2 as separate structures, and the connection between the two is limited to a rotational connection by the bearing assembly 3. This allows the inner sleeve 2 to rotate freely within the shell 1. With the fixed seat 4 and matching tightening screw 6, the large nut fixed in the sleeve 2 can be rotated more conveniently, while preventing the large nut from slipping out of the sleeve 2 during the flipping process. This solves the technical problems of poor stability, easy falling of nuts, and damage to the sling due to wear in the existing nut hoisting technology. At the same time, it improves the installation efficiency of large nuts. Moreover, for nuts of different specifications, only the corresponding sleeve 2 needs to be replaced to achieve hoisting, which has strong versatility.

Claims

1. A hoisting structure for large nut mounting comprising an outer shell (1) and an inner sleeve (2), characterized in that: The housing (1) is coaxially arranged with the sleeve (2) and can rotate relative to it. The shape of the hollow part of the sleeve (2) matches the outer circumferential shape of the large nut to be installed. It also includes a nut limiting assembly installed on the sleeve (2) to fix the large nut relative to the sleeve (2).

2. The hoisting structure for large nut mounting according to claim 1, characterized in that: It also includes a complex array bearing assembly (3), an annular groove (5) is provided on the inner side of the housing (1), and a through hole (8) is provided on the housing (1) through the annular groove (5) at the corresponding position for installing the bearing assembly (3), and the bearing assembly (3) is used to support the outer circumferential surface of the sleeve (2).

3. The hoisting structure for large nut mounting according to claim 2, characterized in that: Each bearing assembly (3) includes a bearing fixing shaft (31), a bearing positioning ring (32), a nut (33), two bearings (34) and two bearing retaining rings (35). The bearing fixing shaft (31) passes through the annular groove (5) and is rotatably mounted on the through hole (8). The two bearings (34) are mounted on the bearing fixing shaft (31) in the annular groove (5) and their outer rings are used to support the sleeve (2). The bearing positioning ring (32) determines the distance between the two bearings (34). The bearing retaining rings (35) are located between the bearings (34) and the annular groove (5). The bearing fixing shaft (31) is mounted in the through hole (8) by the nut (33).

4. The hoisting structure for large nut mounting according to claim 1, characterized by: The nut limiting assembly uses a fixed seat (4) and a tightening screw (6). The fixed seat (4) is set on the sleeve (2) and is arranged in a centrally symmetrical manner relative to the sleeve (2). The fixed seat (4) is provided with an internal thread through hole that matches the tightening screw (6). The axis of the tightening screw (6) is located in the radial direction of the sleeve (2).

5. The hoisting structure for large nut mounting according to claim 1, characterized by: It also includes a plurality of first lifting rings (9) and a plurality of second lifting rings (7), the second lifting rings (7) being distributed on the circumferential surface of the housing (1), and the first lifting rings (9) being disposed on one side of the housing (1).

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