A galvanized railing for tower crane

Abstract

The utility model discloses a galvanized handrail for a tower crane, which is formed by connecting a hollow crossbar, a vertical bar and a bending bar. The bending bar includes a bending part and a vertical part. The bottoms of the vertical bar and the vertical part are both open without a closed space. The two ends of the crossbar are stamped structures, which are stamped into arc grooves by a punch die head. The arc groove is integrally composed of a semicircular arc and a leakage hole. The leakage hole is located in the middle of the semicircular arc. The radius of the semicircular arc is the same as the rod radius of the vertical bar or the vertical part of the bending bar. The semicircular arcs at the two ends of the crossbar are clamped on the vertical bar or the vertical part and welded and fixed. The leakage hole is used to leak zinc liquid during galvanizing. This crossbar structure will not produce liquid accumulation during galvanizing, which can save galvanizing costs.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to a galvanized handrail of a tower crane. Background Art

[0002] The handrails of tower cranes are usually made of steel pipes, which are then galvanized for rust prevention. Due to high temperature and other factors, the galvanizing process must ensure that there is no closed cavity, otherwise it will cause the steel pipe to burst. In order to solve the problem of crossbar bursting (because the vertical pipe is not closed and no encapsulation cavity is formed), process holes will be processed on the crossbar to release the encapsulation space. When the crossbar is immersed in zinc liquid and then pulled out, the zinc liquid will flow out from the process holes. The conventional solution for the process holes of the crossbar is to use a pipe punching machine to punch and form the pipes, so that the two ends of the steel pipe form a shovel-shaped outward expansion structure, which is in the shape of a dovetail, such as Figure 4 As shown. Since the galvanizing process adopts the principle of charging by weight increase, it is necessary to ensure that the drilling position is located at the position that is most conducive to the outflow of the galvanizing liquid and can ensure smooth exhaust. The drilling position must be selected at the dovetail shape position of the end of the punching and shearing forming. However, due to the local hardening and cracking caused by the punching and shearing process, the difficulty of drilling is increased and it is very easy to cause the drill bit to break or break. It is also impossible to select the drilling position at the very end. There is still a certain amount of zinc accumulation in the later galvanizing, which leads to increased production costs and waste of zinc liquid. Utility Model Content

[0003] The utility model aims to provide a galvanized handrail for a tower crane to solve the problem of liquid accumulation in a crossbar.

[0004] To achieve the above-mentioned purpose, the utility model provides a galvanized railing for a tower crane, which is connected by a hollow cross bar, a vertical bar and a bending bar, wherein the bending bar includes a bending portion and a vertical portion, and the bottoms of the vertical bar and the vertical portion are both open without a closed space; the two ends of the cross bar are stamped structures, which are punched into arc grooves by a die head, and the arc grooves are integrally composed of a semicircular arc and a leakage hole, and the leakage hole is located in the middle of the semicircular arc; the radius of the semicircular arc is the same as the rod radius of the vertical bar or the vertical portion of the bent rod; the semicircular arcs at the two ends of the cross bar are clamped on the vertical bar or the vertical portion and welded and fixed, and the leakage hole is used to leak zinc liquid during galvanizing.

[0005] As a further improvement of the utility model, a through hole is provided on the bent portion of the bent rod for leaking out the zinc liquid during galvanizing.

[0006] The beneficial effects of the utility model are:

[0007] (1) Both ends of the crossbar are stamped structures, and the leakage hole is located in the middle part of the arc groove. It is an upper and lower through hole, and no liquid will accumulate during galvanizing, thereby saving the galvanizing cost;

[0008] (2) The two ends of the horizontal bar are formed into a semicircular arc by stamping, which makes it easier to weld and fix them with the vertical bar to increase stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the crossbar structure of the utility model;

[0010] Figure 2 It is a structural diagram of the railing;

[0011] Figure 3 It is a structural diagram of the die head;

[0012] Figure 4 It is a structural schematic diagram of a crossbar in the prior art;

[0013] In the figure, 1- horizontal bar, 11- arc groove, 12- leakage hole, 11-2- vertical bar, 3- bending bar, 4- die head. DETAILED DESCRIPTION

[0014] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] like Figure 1-Figure 3 As shown, a galvanized handrail for a tower crane is formed by connecting a hollow horizontal bar 1, a vertical bar 2 and a bending bar 3. The bending bar 3 includes a bending portion and a vertical portion. The bottoms of the vertical bar 2 and the vertical portion are open without a closed space. The two ends of the horizontal bar 1 are stamped structures, and the arc groove 11 is punched by a die head 4. The arc groove 11 is integrally composed of a semicircular arc and a leakage hole 12. The leakage hole 12 is located in the middle of the semicircular arc; the radius of the semicircular arc is the same as the rod radius of the vertical bar 2 or the vertical portion of the bending bar. The semicircular arcs at both ends of the horizontal bar 1 are clamped on the vertical bar 2 or the vertical portion and fixed by welding. The leakage hole 12 is used to leak zinc liquid during galvanizing. When the cross bar 1 is connected to the vertical part of the vertical bar 2 or the bending bar 3, the leakage hole 12 is in the state of an upper and lower through hole. Therefore, compared with the structure at both ends of the cross bar in the prior art, during the galvanizing process, the zinc liquid will leak out directly without generating liquid accumulation. Moreover, the arc groove 11 formed by the stamping is very convenient for docking and fixing with the vertical bar 2 and the vertical part.

[0016] In addition, there is also a horizontal rod on the bent portion of the bending rod 3, and upper and lower through holes are provided on the horizontal rod. When the railing is lifted from the galvanizing liquid, the zinc liquid will leak out from the vertical portion as well as from the through holes of the horizontal rod, preventing liquid from accumulating in the rod.

[0017] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Various changes that can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A galvanized handrail for a tower crane, which is formed by connecting a hollow horizontal bar (1), a vertical bar (2) and a bending bar (3), wherein the bending bar (3) comprises a bending portion and a vertical portion, and the bottoms of the vertical bar (2) and the vertical portion are both open without a closed space; characterized in that: The two ends of the cross bar (1) are punched structures, and are punched into arc grooves (11) by a punch die head (4). The arc grooves (11) are integrally formed by a semicircular arc and a leakage hole (12), and the leakage hole (12) is located in the middle of the semicircular arc; the radius of the semicircular arc is the same as the rod radius of the vertical rod (2) or the vertical part of the bent rod; the semicircular arcs at the two ends of the cross bar (1) are clamped on the vertical rod (2) or the vertical part and fixed by welding, and the leakage hole (12) is used to leak zinc liquid during galvanizing.

2. The galvanized handrail for tower crane according to claim 1, characterized in that: The bent portion of the bending rod (3) is provided with a through hole for leaking zinc liquid during galvanizing.

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