Balance beam structure

Abstract

The utility model discloses a balance beam structure which comprises a box beam, and the box beam is connected with an upper support and a lower support respectively in a local open type connection structure. Each supporting hinge lug of the upper support and each supporting hinge lug of the lower support are embedded between two box beam side vertical plates of the box beam; and the upper support and the lower support are respectively connected with the box beam through connecting pin shafts. A support embedded structure and a short pin shaft are adopted for connection, the stress of a hole shaft at the joint is improved, the size and the quality of the pin shaft are reduced, the disassembly and assembly convenience is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of balance beams, and particularly relates to a balance beam structure. Background Art

[0002] Large-scale rail-mounted lifting equipment refers to large-scale lifting equipment running on rails, such as gantry cranes, ring rails, etc. Large-scale rail-mounted lifting equipment is widely used in engineering construction and equipment manufacturing due to its strong bearing capacity, stable operation, small single-wheel driving force, and high efficiency. This type of lifting equipment runs on rails through a traveling device, and uses a multi-stage balance beam system to evenly distribute and transfer the weight of the upper car and the lifted object to the traveling mechanism.

[0003] The supports of the balance beam in the prior art respectively straddle and connect to the upper middle part and two ends of the box girder, and are hinged through long pin shafts, which is called a support external-span connection structure herein. This structure has the following problems:

[0004] 1. Poor force on the hole and shaft at the pin connection: The force characteristics of the connecting pin shaft between the support and the box girder are of a cantilever beam structure; the number of surfaces of a single pin shaft supported and extruded by the beam is 2, and the number of surfaces sheared is 2. Under the same load-bearing weight, the extrusion surface and the shear surface are less, the stress on the hole and shaft at the connection is large, and the force is poor.

[0005] 2. Large size, heavy weight, inconvenient disassembly and assembly, and high cost of the connecting pin shaft: Due to the heavy self-weight of the large-scale rail-mounted lifting equipment and the weight of the lifted object, it determines that the cross-section of the box girder, the support hinge ear, the connecting pin shaft, etc. are of large sizes; the long length and large diameter of the connecting pin shaft will bring problems of heavy weight, inconvenient disassembly and assembly, and high cost.

[0006] Therefore, it is necessary to develop a new type of balance beam structure specifically to overcome the above problems. Content of the Utility Model

[0007] Purpose of the utility model: Aiming at the deficiencies and defects of the prior art, the utility model provides a balance beam structure, which adopts a support embedded structure and short pin shaft connection to improve the force on the hole and shaft at the connection, reduce the size and mass of the pin shaft, enhance the convenience of disassembly and assembly, and reduce the production cost.

[0008] Technical solution: A balance beam structure of the utility model includes a box girder, and the box girder respectively adopts a partial open connection structure with an upper support and a lower support; each support hinge ear of the upper support and the lower support is embedded between two side vertical plates of the box girder; the upper support and the lower support are respectively connected to the box girder through a connecting pin shaft.

[0009] Wherein, a connection structure of double hinge ears to single hinge ear + short pin shaft is formed between each support hinge ear of the box girder and the upper support and the lower support.

[0010] Among them, the side vertical plate of the box girder is provided with a support hinge ear hole for pin installation.

[0011] Among them, the upper support and the lower support are of a double-support hinge ear structure.

[0012] Among them, the support hinge ear is provided with a pin connection hole.

[0013] Among them, the number of pins connecting the upper support and the lower support to the box girder is 2.

[0014] Among them, the upper support and the lower support are respectively connected to the connection pin I and the connection pin II.

[0015] Beneficial effects: Compared with the prior art, the present utility model has the following remarkable advantages: The present utility model is applied to the bearing member between the upper lifting structure and the lower traveling mechanism of a large-scale rail-mounted lifting equipment. By adopting an open layout structure at the support connection of the box girder, the support hinge ears of the support are embedded between the two side vertical plates of the beam. Each support hinge ear of the box girder and the support forms a connection mode of double hinge ears to single hinge ear + short pin. The short pin is a simply supported beam structure supported by hinges at both ends, forming an embedded connection between the support and the box girder. The present utility model can improve the force on the hole and shaft at the connection between the box girder and the support, reduce the length and diameter of the connection pin, reduce the weight, improve the convenience of disassembly and assembly, and reduce the manufacturing cost, etc. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the structure and force at the connection pin between the box girder and the support of the balance beam in the prior art;

[0017] Figure 2 It is a schematic diagram of the structure of the present utility model;

[0018] Figure 3 It is a schematic diagram of the structure and force at the connection pin between the box girder and the support of the present utility model;

[0019] In the figure, 1 is the box girder; 2 is the upper support; 3 is the connection pin I; 4 is the lower support; 5 is the connection pin II; 11 is the side vertical plate of the box girder. Detailed Embodiment

[0020] The technical solution of the present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0021] The balance beam structure of the present utility model includes a box girder 1. The box girder 1 is respectively connected to the upper support 2 and the lower support 4 by a partial open connection structure; each support hinge ear of the upper support 2 and the lower support 4 is embedded between the two box girder side vertical plates 11 of the box girder 1; the upper support 2 and the lower support 4 are respectively connected to the box girder 1 through connection pins.

[0022] Among them, a double hinge ear pair single hinge ear + short pin shaft connection structure is formed between the box girder 1 and each support hinge ear of the upper support 2 and the lower support 4. The support hinge ear holes for pin shaft installation are provided on the side vertical plate 11 of the box girder. The upper support 2 and the lower support 4 are double support hinge ear structures. The support hinge ears are provided with pin shaft connection holes. The number of pin shafts for connecting the upper support 2 and the lower support 4 to the box girder 1 is 2. The upper support 2 and the lower support 4 are respectively connected to the connection pin shaft I3 and the connection pin shaft II5.

[0023] As Figure 2 , in the utility model, the box girder adopts a local open structure at the connection with the support, so that each support hinge ear of the support is embedded between the two side vertical plates of the beam, and the distance between the two side vertical plates is small; a double hinge ear pair single hinge ear + short pin shaft connection mode is formed between the box girder and each support hinge ear of the support, and the connection pin shafts of each outrigger beam structure in the existing structure are replaced by the connection pin shafts of two simply supported beam structures, as Figure 3 shown; the span of the support points of the connection pin shafts can be effectively shortened, and the total number of support hinge ears on the box girder and the total number of compressed and sheared surfaces on the connection pin shafts are twice that of the existing structure.

[0024] The utility model is composed of a box girder, (upper and lower) supports and connection (short) pin shafts; the box girder adopts a conventional layout with a large cross-section in the middle and small cross-sections at both ends (relative to the middle cross-section), and a local open structure is adopted at the connection with the support. Side vertical plates are arranged on both sides of the open structure, and the distance between adjacent side vertical plates is small. The side vertical plates are provided with support hinge ear holes for pin shaft installation; the support is a double support hinge ear structure, and the support hinge ears are provided with pin shaft connection holes; the connection pin shafts are small-sized pin shafts, and the number of pin shafts for connecting each support to the box girder is 2; the support hinge ears of the support are placed between the side vertical plates of the open structure of the box girder and the short connection pin shafts are assembled into a balance beam with a support embedded connection structure.

[0025] The working principle of the utility model is that a double hinge ear pair single hinge ear + short pin shaft connection mode is formed between the box girder and each support hinge ear of the support. The short pin shaft is a simply supported beam structure with hinge supports at both ends and the span of the two support hinge points is small. The number of support hinge ears on the box girder at the connection and the number of surfaces of the pin shaft subjected to extrusion and shear increase by 1 time. For comparison, as Figure 1 and Figure 3 shown; according to the calculation formulas (1), (2), and (3) of the anti-extrusion strength of the hole-shaft mating surface, the anti-shear and anti-bending strengths of the connection pin shaft, it can be known that under the same total bearing capacity, the extrusion force F 1 of the single hinge ear and the shear force F 2 of a single shear surface of the pin shaft in the present invention are both half of the corresponding forces in the existing technical solutions, and the bending moment borne by the short pin shaft is small; the extrusion stress of the hole-shaft mating surface, the shear and bending stresses of the connection pin shaft at the connection are small; therefore, the utility model can effectively improve the stress state of the edge of the support hinge ear hole of the box girder and the connection pin shaft; the connection pin shaft is small in size, light in weight, low in cost, and convenient for disassembly and assembly.

[0026]

[0027] In the extrusion strength checking formula for the mating surface of the box girder support hinge ear hole and the pin shaft:

[0028] σ bs —The extrusion stress of the mating surface;

[0029] F 1 —The extrusion force on the surface of a single support hinge ear hole;

[0030] A bs —The projected area of the mating surface of a single hole and shaft on the cross-section at the shaft center, A bs = bd, where b is the thickness of the hinge ear and b is the pin shaft diameter;

[0031] [σ bs —The allowable extrusion stress of the material at the mating surface;

[0032]

[0033] In the shear strength checking formula for the pin shaft:

[0034] τ—The shear stress of the shear surface of the pin shaft;

[0035] F 2 —The shear force borne by a single shear surface of the pin shaft. Here, F 2 = F 1 ;

[0036] A—The shear surface area of the pin shaft, d is the pin shaft diameter;

[0037] [τ]—The allowable shear stress of the pin shaft material;

[0038]

[0039] In the bending strength checking formula for the pin shaft:

[0040] σ max —The maximum bending stress of the pin shaft;

[0041] M max —The pin shaft is subjected to the maximum bending moment, M = F 1 ·L, where L is the distance between the box girder hinge ear and the support hinge ear;

[0042] W—The bending moment of inertia section coefficient of the pin shaft, d is the pin shaft diameter;

[0043] [σ]—The allowable stress of the pin shaft material.

[0044] In view of the problems of the prior art, the present utility model:

[0045] 1. Improvement in the force-bearing of the beam support hinge ear hole and pin at the connection: In the present invention, the connection mode of double ears against single ear + short pin between the box girder and the support hinge ear of the support increases the total number of extrusion surfaces of the beam support hinge ear and the total number of extrusion and shear surfaces of the connecting pin, reduces the bending moment borne by the pin, and reduces the extrusion stress of the hole-shaft mating surface, as well as the shear and bending stresses of the pin.

[0046] 2. The connecting pin is small in size, light in weight, convenient for disassembly and installation, and low in cost: In the present invention, the short pin has a simply supported beam structure with both ends hinged and supported, and the span of the support hinge points at both ends is small, so the force-bearing is improved; this enables the connecting pin to be small in size, light in weight, convenient for disassembly and installation, and low in production cost.

[0047] The box girder of the present utility model adopts a locally open structure at each connection with the support hinge ear of the support. Side plates are provided on both sides of the open structure. The box girder and each support hinge ear of the support form a connection mode of double hinge ears against single hinge ear + short pin. The short pin has a simply supported beam structure with both ends supported by hinges; this improves the force-bearing state of the beam support hinge ear hole edge and the connecting pin; makes the connecting pin small in size, light in weight, low in cost, and convenient for disassembly and installation.

Claims

1. A balance beam structure, characterized in that: The invention comprises a box beam (1), wherein the box beam (1) and an upper support (2) and a lower support (4) respectively adopt a partially open connection structure; each support hinge ear of the upper support (2) and the lower support (4) is embedded between two box beam side vertical plates (11) of the box beam (1); and the upper support (2) and the lower support (4) are respectively connected to the box beam (1) via a connecting pin shaft.

2. The balance beam structure according to claim 1, characterized in that: A connection structure of double hinge ears to single hinge ears + short pin shaft is formed between the box beam (1) and each supporting hinge ear of the upper support (2) and the lower support (4).

3. The balance beam structure according to claim 1, characterized in that: The box beam side vertical plate (11) is provided with supporting reaming ear holes for installing pin shafts.

4. The balance beam structure according to claim 3, characterized in that: The upper support (2) and the lower support (4) are double-support hinge ear structures.

5. The balance beam structure according to claim 4, characterized in that: The supporting hinge ear is provided with a pin shaft connecting hole.

6. The balance beam structure according to claim 5, characterized in that: The number of pins connecting the upper support (2), the lower support (4) and the box beam (1) is 2.

7. The balance beam structure according to claim 1, characterized in that: The upper support (2) and the lower support (4) correspond to the connecting pin shaft I (3) and the connecting pin shaft II (5) respectively.

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