A truss lug connection spreader

Abstract

The utility model discloses a truss lug ear connects a lifting appliance, including the left lug ear and right lug ear of left and right symmetry setting in the left and right sides of truss and the pin shaft of inserting in the truss node, the circumference side of pin shaft is equipped with the shaft sleeve, the left and right ends of the circumference side of shaft sleeve are symmetrically provided with the rotary seat, the rotary seat is rotatably connected with the shaft sleeve through the bearing, the circumference side of rotary seat is provided with the annular groove of the cross section of semicircle, the left lug ear and right lug ear are inserted in two annular grooves respectively, the lower end of left lug ear and right lug ear is inserted with the derrick column through, the utility model discloses a rotary seat, shaft sleeve and bearing have realized the relative rotation between left lug ear and right lug ear and pin shaft, make lug ear and pin shaft no longer directly sliding contact between, thereby reduced direct contact surface friction wear and stress dispersion, reduced the friction loss between left lug ear, right lug ear and pin shaft, prolonged the service life of left lug ear, right lug ear and pin shaft.

Description

Technical Field

[0001] This utility model belongs to the field of steel structure hoisting and assembly technology, and relates to a truss lifting lug connection lifting tool. Background Technology

[0002] Truss structures are widely used in large-scale engineering projects due to their high strength-to-weight ratio. The assembly and hoisting of trusses typically rely on welded or bolted lifting lugs as lifting transition components. Traditional lifting lug structures primarily use welded or integrally cast steel plates, with the lifting holes directly bearing the pins or hooks, transferring the load to the truss nodes via lifting equipment. Existing patents and literature propose several improvements to the load-bearing capacity, angle adjustment, and assembly convenience of the lifting lugs. These improvements include increasing cross-sectional stiffness with reinforcing plates, using modular lifting lugs to adapt to different lifting equipment specifications, and pre-installing pins at the lifting lugs to improve on-site assembly efficiency.

[0003] Chinese utility model patent CN218664986U discloses a lifting device for space trusses, comprising a sleeve installed on the lower chord of the truss, a tightening screw disposed between the sleeve and the lower chord of the truss, a lifting seat connected to a lifting rope, and an insert shaft disposed between the lifting seat and the sleeve. The sleeve and tightening screw enable the installation of bolted tightening joints on the lower chord of the truss, while the lifting seat and insert shaft enable a detachable connection between the lifting rope and the sleeve. This allows for the installation of detachable lifting joints on the lower chord of the truss, solving the technical problem of cumbersome welding and cutting operations between the lifting lugs and the lower chord, thus improving the lifting efficiency of space trusses.

[0004] However, in the above technical solution, the lifting lug and the lifting base are directly connected by a pin, and the lifting lug is in direct contact with the pin. When the lifting lug rotates, hard friction is generated between it and the pin, which may affect the service life of the lifting lug and the pin during use. Utility Model Content

[0005] To address the problem that the lifting lugs directly contact the pins, resulting in hard friction between the lugs and the pins during rotation, which may affect the service life of both the lugs and the pins, this invention proposes a truss lifting lug connection device. This device effectively solves the problem in the prior art where the lifting lugs directly contact the pins, generating hard friction during rotation, which may affect the service life of both the lugs and the pins.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A truss lifting lug connection lifting device includes a left lifting lug and a right lifting lug symmetrically arranged on the left and right sides of the truss, and a pin inserted into the truss node. A bushing is sleeved on the circumferential side of the pin. Rotating seats are symmetrically arranged at the left and right ends of the circumferential side of the bushing. The rotating seats are rotatably connected to the bushing through bearings. A semi-circular groove is opened on the circumferential side of the rotating seats. A gourd-shaped through hole is opened on the side of both the left and right lifting lugs so that the left and right lifting lugs can be inserted into the two annular grooves respectively. A lifting column is inserted through the lower end of the left and right lifting lugs.

[0007] Furthermore, two limiting plates are symmetrically arranged at the left and right ends of the pin shaft. Each limiting plate has an arc-shaped protrusion on its side near the rotating seat. The arc-shaped protrusion is located on the upper side of the left and right lifting lugs.

[0008] Furthermore, the limiting plate has two limiting protrusions symmetrically arranged on the side near the bushing, which are inserted into the bushing.

[0009] Furthermore, two first limiting nuts are symmetrically arranged at the left and right ends of the pin shaft. The first limiting nuts are threadedly connected to the pin shaft and fit against the side of the limiting plate.

[0010] Furthermore, an annular insertion groove is provided on the right side of the lower end of the left lifting lug, and an annular protrusion is provided on the left side of the lower end of the right lifting lug that can be inserted into the insertion groove.

[0011] Furthermore, a second limiting nut is threadedly connected to the end of the lifting column, and the second limiting nut is in contact with the side of the left lifting lug.

[0012] Furthermore, the bushing is made of high-chromium white cast iron.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This utility model achieves relative rotation between the left and right lifting lugs and the pin shaft through a rotating seat, bushing, and bearing, so that the lifting lugs and the pin shaft no longer have direct sliding contact, thereby reducing friction and wear on the direct contact surface and dispersing stress, making the left and right lifting lugs rotate more smoothly, reducing frictional loss between the left and right lifting lugs and the pin shaft, and extending the service life of the left and right lifting lugs and the pin shaft. This utility model can longitudinally limit the left and right lifting lugs by the limiting protrusions on the limiting plate, preventing the left and right lifting lugs from vibrating and displacing upwards from the rotating seat, thus ensuring the reliability and stability of the device during use. This utility model forms a stable plug-in fit through the plug-in groove and annular protrusion at the lower end of the left and right lifting lugs, so that the left and right lifting lugs form an integral force-bearing structure, preventing the lifting lugs from being misaligned due to uneven load. Furthermore, the plug-in groove and annular protrusion can position the left and right lifting lugs during installation, improving the convenience of the left and right lifting lugs during installation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the left view of the present invention; Figure 3 This is a front view of the present utility model; Figure 4 This is a left view of the left lifting lug of this utility model; Figure 5 This is a right view of the limiting plate of this utility model.

[0015] In the diagram: 1. Truss node; 2. Left lifting lug; 3. Right lifting lug; 4. Pin; 5. Bushing; 6. Limiting plate; 7. First limiting nut; 8. Second limiting nut; 9. Lifting column. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0017] A truss lifting lug connection device includes a left lifting lug 2 and a right lifting lug 3 symmetrically arranged on the left and right sides of the truss, and a pin 4 inserted into the truss node 1. A bushing 5 is fitted on the circumferential side of the pin 4. Rotating seats are symmetrically arranged at the left and right ends of the circumferential side of the bushing 5. The rotating seats are rotatably connected to the bushing 5 through bearings. A semi-circular groove is opened on the circumferential side of the rotating seat. A gourd-shaped through hole is opened through the side of both the left lifting lug 2 and the right lifting lug 3 so that the left lifting lug 2 and the right lifting lug 3 can be inserted into the two annular grooves respectively. A lifting column 9 is inserted through the lower end of the left lifting lug 2 and the right lifting lug 3.

[0018] In this embodiment, the bushing 5 is made of high-chromium white cast iron.

[0019] In this embodiment, two limiting plates 6 are symmetrically arranged at the left and right ends of the pin 4. The side of the limiting plate 6 near the rotating seat is provided with an arc-shaped protrusion, which is located on the upper side of the left lifting lug 2 and the right lifting lug 3.

[0020] In this embodiment, two first limiting nuts 7 are symmetrically arranged at the left and right ends of the pin 4. The first limiting nuts 7 are threadedly connected to the pin 4, and the first limiting nuts 7 are in contact with the side of the limiting plate 6.

[0021] When using the above embodiments: In use, the pin 4 is inserted into the truss node 1. The bushing 5 sleeved on the circumferential surface of the pin 4 plays the role of rotation and buffering. The rotating seats at both ends of the bushing 5 are rotatably connected to the bushing 5 through bearings, so that the left lifting lug 2 and the right lifting lug 3 can swing freely with the change of load direction during the lifting process. Since the lifting lug is inserted into the annular groove of the rotating seat through the gourd-shaped through hole, the load is transferred from the lifting column 9 to the lifting lug during the lifting, and then smoothly transferred to the bushing 5 and the pin 4 through the rotating seat and bearing, and finally acts on the truss node 1. During this process, since the relative angular motion is supported by rolling bearings between the rotating seat and the bushing 5, the lug and the pin 4 no longer have direct sliding contact. Instead, rolling friction or relative rotation is achieved through the rotating seat and bearings, thereby reducing friction and wear on the direct contact surfaces and dispersing stress. This makes the left lug 2 and right lug 3 rotate more smoothly, reduces frictional loss between the left lug 2, right lug 3 and pin 4, and extends the service life of the left lug 2, right lug 3 and pin 4. During use, the limiting protrusions on the limiting plate 6 can longitudinally limit the left lifting lug 2 and the right lifting lug 3, preventing them from vibrating and displacing upwards from the rotating seat, thus ensuring the reliability and stability of the device during use. At the same time, the first limiting nut 7 can horizontally limit the limiting plate 6, preventing it from swaying left and right during use, ensuring the limiting effect of the limiting plate 6 on the left lifting lug 2 and the right lifting lug 3, further improving the reliability of the limiting plate 6 during use, and ensuring the stability of the device during hoisting.

[0022] Example 2 differs from Example 1 in that: In this embodiment, the limiting plate 6 has two limiting protrusions symmetrically arranged on the side near the bushing 5, which are inserted into the bushing 5. During use, the limiting protrusion inside the limiting plate 6 is inserted into the bushing 5, which can prevent the limiting plate 6 from rotating during use and ensure the stability of the limiting during use. At the same time, the limiting protrusion improves the connection strength between the limiting plate 6 and the bushing 5, further ensuring the overall connection strength of the device.

[0023] In this embodiment, an annular insertion groove is provided on the right side of the lower end of the left lifting lug 2, and an annular protrusion that can be inserted into the insertion groove is provided on the left side of the lower end of the right lifting lug 3. During use, the insertion grooves and annular protrusions at the lower ends of the left lifting lug 2 and the right lifting lug 3 form a stable insertion fit, making the left and right lifting lugs 3 form an integral force-bearing structure, preventing the lifting lugs from being misaligned due to uneven load. Furthermore, the insertion grooves and annular protrusions can position the left and right lifting lugs 2 and 3 during installation, improving the convenience of installation. At the same time, the insertion grooves and annular protrusions improve the connection strength between the left and right lifting lugs 2 and 3, ensuring the reliability of the device during hoisting.

[0024] In this embodiment, a second limiting nut 8 is threadedly connected to the end of the lifting column 9, and the second limiting nut 8 fits against the side of the left lifting lug 2; During use, the second limiting nut 8 at the end of the lifting column 9 is tightly attached to the side of the lifting lug, further ensuring that the lifting column 9 will not loosen or shift under load.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A truss lifting lug connection device, comprising a left lifting lug (2) and a right lifting lug (3) symmetrically arranged on the left and right sides of the truss, and a pin (4) inserted into the truss node (1), characterized in that: The pin (4) is fitted with a bushing (5) on its circumferential side. Rotating seats are symmetrically arranged at the left and right ends of the bushing (5). The rotating seats are rotatably connected to the bushing (5) through bearings. The rotating seats have a semi-circular cross-section groove on their circumferential side. The left and right lifting lugs (2) and right lifting lugs (3) are both provided with gourd-shaped through holes so that the left and right lifting lugs (2) and right lifting lugs (3) can be inserted into the two grooves respectively. The lower ends of the left and right lifting lugs (2) and right lifting lugs (3) are provided with a lifting column (9).

2. The truss lifting lug connecting device according to claim 1, characterized in that: Two limiting plates (6) are symmetrically arranged at the left and right ends of the pin (4). The side of the limiting plate (6) near the rotating seat is provided with an arc-shaped protrusion. The arc-shaped protrusion is located on the upper side of the left lifting lug (2) and the right lifting lug (3).

3. The truss lifting lug connecting device according to claim 2, characterized in that: The limiting plate (6) has two limiting protrusions symmetrically arranged on the side near the bushing (5), which are inserted into the bushing (5).

4. A truss lifting lug connecting lifting device according to claim 2, characterized in that: Two first limiting nuts (7) are symmetrically arranged at the left and right ends of the pin (4). The first limiting nuts (7) are threaded onto the pin (4) and are in contact with the side of the limiting plate (6).

5. A truss lifting lug connecting device according to claim 1, characterized in that: The lower right side of the left lug (2) is provided with an annular insertion groove, and the lower left side of the right lug (3) is provided with an annular protrusion that can be inserted into the insertion groove.

6. A truss lifting lug connecting lifting device according to claim 1, characterized in that: The end of the lifting column (9) is threaded with a second limiting nut (8), which fits against the side of the left lifting lug (2).

7. A truss lifting lug connecting lifting device according to claim 1, characterized in that: The bushing (5) is made of high-chromium white cast iron.

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