Circular standard knot male joint

Abstract

The utility model relates to a circular standard knot male joint, and belongs to the field of tower crane equipment. The circular standard knot male joint comprises a base and a connecting part, the connecting part is arranged on the base, a column aligning cavity is formed in the connecting part, and a butt joint pin shaft is inserted into the column aligning cavity after the column aligning cavity is connected with a female joint; and the base is fixed on the circular main chord. According to the circular standard knot male joint, the circular main chord base body rod is adopted, the structure is stable, wind loads and other external force can be effectively resisted, and the stability and safety of a tower crane are kept; and the circular main chord base body rods are beneficial to reducing wind resistance and improving the wind resistance of the tower crane.

Description

Technical Field

[0001] The utility model relates to a circular standard joint male connector, belonging to the field of tower crane equipment. Background Art

[0002] The tower crane main chord joint is a key component in tower cranes. It is used to connect the various standard sections of the tower crane to ensure the stability and safety of the tower crane. Whether at home or abroad, the technical development trend of the tower crane main chord male joint tends to improve the stability, safety and convenience of installation. The standard section circular main chord base has many advantages over the traditional square main chord.

[0003] At present, the domestic small and medium-sized tower cranes (below 125t·m) with large quantity and wide application account for about 80% of the total number of tower cranes. The connection form of their tower standard sections mostly adopts the method of welding two cylindrical connecting sleeves on the outside of the square steel tube main chord and fastening them with high-strength bolts. The standard sections with this connection form are easy to purchase raw materials, simple manufacturing process, high production efficiency, low manufacturing cost and convenient installation and disassembly, so they are widely welcomed by users. However, there are many accidents in the use of standard sections with high-strength bolt connection. The main form of damage is cracks, which basically appear at the weld between the upper part of the cylindrical connecting sleeve and the main chord, and gradually extend to the depth of the cross section of the main chord until the main material breaks. This kind of accident occurs many times in China every year. Utility Model Content

[0004] The utility model provides a circular standard joint male joint, which solves the instability caused by the butt fixation of square main chords and reduces the risk of main material breakage.

[0005] The utility model adopts the following technical solutions:

[0006] The utility model discloses a circular standard joint male joint, which comprises a base and a connecting part; the connecting part is arranged on the base, and a column cavity is provided on the connecting part, and the column cavity is used for inserting a docking pin shaft after being connected with a female joint; the base is fixed on the circular main chord.

[0007] The circular standard joint male connector of the utility model has a base and a connecting part which are coaxially arranged.

[0008] The circular standard joint male joint of the utility model has a bottom end surface of the base provided with a chamfer; the connecting surface between the circular main chord and the male joint base is provided with an inner chamfer and an outer chamfer respectively; the chamfer of the base is tangent to the inner chamfer of the circular main chord to form a self-centering.

[0009] In the circular standard joint male connector described in the utility model, the outer diameter of the chamfer of the base is smaller than the inner chamfer diameter of the circular main chord.

[0010] In the circular standard joint male joint of the utility model, the chamfered slope of the base and the outer chamfered slope of the circular main chord form a welding groove for welding. Beneficial Effects

[0011] The circular standard section male joint provided by the utility model adopts a circular main chord base rod with a stable structure, which can effectively resist wind loads and other external forces and maintain the stability and safety of the tower crane; the circular main chord base rod is beneficial to reducing wind resistance and improving the wind resistance of the tower crane.

[0012] The circular standard section male joint provided by the utility model effectively improves the processing and assembly accuracy of the main chord structure of the standard section, improves reliability, and at the same time reduces the labor intensity of workers, thereby improving production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the male connector structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the circular main chord structure of the utility model;

[0015] Figure 3 It is a schematic diagram of the assembly of the utility model;

[0016] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model after assembly.

[0017] 1-base, 2-connecting part, 3-column cavity, 4-circular main chord, 5-welding groove, 6-male joint, 7-female joint, 8-chamfer 1, 9-inner chamfer, 10-outer chamfer. DETAILED DESCRIPTION

[0018] In order to make the purpose and technical solution of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 , Figure 2 As shown: a circular standard joint male connector, the male connector comprises a base 1 and a connecting portion 2; the connecting portion 2 is arranged on the base 1, and the base 1 and the connecting portion 2 are coaxially arranged;

[0020] The connecting portion 2 is provided with a column cavity 3, which is used to insert a docking pin after being connected with the female joint 7; the base 1 is fixed on the circular main chord 4.

[0021] The outer diameter φD2 of the unchamfered end face of the male joint is larger than the inner diameter φd2 of the circular tubular main chord base, and φD1 is smaller than φd2. There is a chamfer of 81 between the male joint φD1 and φD2, and an inner chamfer of 9 between the circular main chord φd2 and φd1.

[0022] During the assembly process, the male connector 6 is aligned with the center of the circular main chord base from above and inserted. Due to the self-centering effect of the chamfer 8 and the inner chamfer 9, the male connector 6 can be ensured to be concentric with the main chord base. At the same time, the outer diameter φD1 of the end face of the male connector 6 and the outer diameter φd3 of the circular tubular main chord base are controlled within the tolerance range of 0 or -1, ensuring a smooth transition of the outer diameter in the axial direction and avoiding a sudden change in cross section.

[0023] During the processing, the end face φD2 at the chamfer 8 of the male connector 6 should be smaller than the inner diameter φd2 of the circular main chord 4, and the value of (φd2-φD2) should be at least 20% of the wall thickness of the circular main chord, to ensure a certain contact area and the stability of the male connector 6 during welding. The external chamfer 10 of the circular main chord should be guaranteed to reach 70% of the wall thickness or to ensure that the remaining wall thickness after the internal chamfer 9 and the external chamfer 10 is 10% of the original wall thickness, which not only ensures that the weld can be penetrated, but also utilizes the shrinkage characteristics of the weld after welding to further strengthen the connection between the male connector and the main chord matrix.

[0024] The circular main chord 4 base rod has a stable structure. Since the circular main chord base is easy to center, it can effectively ensure the relative position of the male and female heads with the main chord rod, thereby ensuring the overall straightness and verticality of the main chord rod. It helps to improve assembly accuracy and ensure the stability and safety of the tower crane;

[0025] Compared with the square main chord, the standard section circular main chord matrix has advantages in improving connection accuracy, enhancing structural strength, and optimizing material utilization. Therefore, it is more important to propose a joint form suitable for the circular main chord matrix.

[0026] like Figure 3 , Figure 4 As shown: the male connector 6 body and the end body are both cylindrical and coaxially arranged, and the chamfer is arranged around the bottom end of the connector body. The outer diameter of the male connector 6 is consistent with the outer diameter of the circular main chord 4. The outer diameter round chamfer 8 is arranged at the end face of the male connector 6. The connecting surface between the circular main chord 4 and the base of the male connector is provided with an inner chamfer 9 and an outer chamfer 10, respectively, so that the inner chamfer of the main chord is tangent to the outer chamfer of the male connector, forming a self-centering, which has more advantages than rectangular tubes and rectangular connecting plates in terms of processing and assembly. The slope formed by the chamfer 8 of the male connector 6 is used to form a welding groove 5 for welding with the end face of the circular tubular main chord 4. During installation, the circular main chord 4 is hoisted above the male connector 6, and slowly lowered after aligning the male connector 6. The male connector 6 is provided with a through-going docking column cavity 3. When it is concentric with the same column cavity as the male connector, the docking pin is inserted from the side. Insert the R pin to complete the assembly.

[0027] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A circular standard joint male connector, characterized in that: The male connector comprises a base and a connecting part; the connecting part is arranged on the base, a column cavity is provided on the connecting part, and the column cavity is used for inserting a docking pin shaft after being connected with the female connector; the base is fixed on the circular main chord.

2. The circular standard joint male connector according to claim 1, characterized in that: The base and the connecting part are coaxially arranged.

3. The circular standard joint male connector according to claim 1, characterized in that: The bottom end surface of the base is provided with a chamfer 1; the connecting surface between the circular main chord and the male joint base is provided with an inner chamfer and an outer chamfer respectively; the chamfer 1 of the base is tangent to the inner chamfer of the circular main chord to form a self-centering.

4. The circular standard joint male connector according to claim 3 is characterized in that: The outer diameter of the chamfer of the base is smaller than the inner chamfer diameter of the circular main chord.

5. The circular standard joint male connector according to claim 3 is characterized in that: The chamfered slope of the base and the outer chamfered slope of the circular main chord form a welding groove for welding.

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