CN108425538B

CN108425538B - Stepped conical nodular cast iron pipe and tower pole

Info

Publication number: CN108425538B
Application number: CN201810245670.8A
Authority: CN
Inventors: 于逸飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2021-03-30
Anticipated expiration: 2038-03-23
Also published as: CN108425538A

Abstract

The invention discloses a step-shaped conical nodular cast iron pipe which is characterized in that: the stepped conical ductile cast iron pipe is in a hollow frustum shape and comprises a socket section positioned at the large end of the stepped conical ductile cast iron pipe, a socket section positioned at the small end of the stepped conical ductile cast iron pipe and a middle section positioned between the socket section and the socket section; the intermediate section is stepped shaft shaped. Compared with the tapered nodular cast iron pipe, the stepped tapered nodular cast iron pipe has greatly reduced manufacturing cost and popularization and use value.

Description

Stepped conical nodular cast iron pipe and tower pole

Technical Field

The invention relates to a step-shaped conical nodular cast iron pipe and a tower pole, which are used for stringing or bearing equipment, such as electric poles, lamp poles, pipeline brackets and the like.

Background

At present, the conical nodular cast iron pipe is widely applied to the field of towers of transmission system lines and the like, a die used for producing the conical nodular cast iron pipe is a hollow truncated cone, the manufacturing of the die is mainly characterized by inner hole machining, namely deep hole machining, the shape of an inner hole is a conical surface, namely an inclined surface, the machining is difficult, special machining equipment is needed, the manufacturing cost of the die is high, and therefore the cost of the conical nodular cast iron pipe is also high. The problem is urgently needed to be solved by manufacturers of the conical ductile cast iron pipes.

Disclosure of Invention

According to the technical problems, in order to reduce the manufacturing cost of the tower rod, the invention provides the stepped conical nodular cast iron pipe and the tower rod. The technical means adopted by the invention are as follows:

a stepped conical ductile cast iron pipe is in a hollow frustum-like shape and comprises a socket section positioned at the large end of the stepped conical ductile cast iron pipe, a socket section positioned at the small end of the stepped conical ductile cast iron pipe and a middle section positioned between the socket section and the socket section;

the intermediate section is stepped shaft shaped.

The radius difference of adjacent steps in the middle section is a1, and the axial length of each step is b1, wherein a1 is 0.7-1.0mm, and b1 is 90-120 mm.

The total length of the stepped conical ductile cast iron pipe is L, the length of the socket section is a, the length of the middle section is b, and the length of the spigot section is c, wherein L ═ a + b + c, L-.

The invention also discloses a tower rod which comprises a pipe section or a plurality of spliced pipe sections, wherein the pipe section is the stepped conical ductile cast iron pipe.

The outer surface of the existing conical ductile cast iron pipe is a smooth conical surface, the inner surface of a corresponding die is also a conical surface, and the existing conical ductile cast iron pipe is difficult to be formed in one step by adopting deep hole machining and has higher cost.

The outer surfaces of the socket section and the bell section of the stepped conical ductile cast iron pipe are conical surfaces, the middle section is in a stepped shaft shape, the lengths of the socket section and the bell section are shorter, the distance between the socket section and the bell section is closer to the end surface, and the socket section and the bell section are easy to process into conical surfaces; the middle section is long and far away from the end face, so that the middle section is difficult to machine into a conical surface and easy to machine into a stepped shaft shape, the used equipment and machining process are relatively simple, the cost of a die is reduced, and the manufacturing cost of the stepped conical ductile cast iron pipe produced by the middle section is reduced.

Based on the reason, the invention can be widely popularized in the fields of nodular cast iron pipes and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a stepped conical ductile iron pipe according to an embodiment of the present invention.

Fig. 2 is an enlarged schematic view of a portion a of fig. 1.

Fig. 3 is a schematic structural view of a tower according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-3, a tower pole comprises a first pipe section 1 and a second pipe section 2 which are spliced, wherein the first pipe section 1 is positioned above the second pipe section 2, the first pipe section 1 and the second pipe section 2 are both stepped conical ductile cast iron pipes, the stepped conical ductile cast iron pipes are hollow frustum-shaped, and the taper is 15.8: 1000;

the first pipe section 1 comprises a first socket section 11 at its large end, a first spigot section 12 at its small end and a first intermediate section 13 between the first socket section 11 and the first spigot section 12;

the second pipe section 2 comprises a second socket section 21 at its large end, a second spigot section 22 at its small end and a second intermediate section 23 between the second socket section 21 and the second spigot section 22.

The outer diameter of the spigot end of the first pipe section 1 is 150mm, the outer diameter of the socket end is 248mm, the length of the first pipe section 1 is 6200mm, the wall thickness is 6mm, the length of the first spigot section 12 is 800mm, the length of the first spigot section 11 is 900mm, the middle section 13 is in a stepped shaft shape, the length is 4500mm, 45 steps are totally, the axial length of each step is 100mm, and the radius difference of adjacent steps is 0.8 mm;

the outer diameter of the spigot end of the second pipe section 2 is 230mm, the outer diameter of the spigot end is 328mm, the length of the second pipe section 2 is 6200mm, the wall thickness is 6.5mm, the length of the second spigot section 22 is 900mm, the length of the second spigot section 21 is 900mm, the middle section 23 is in a stepped shaft shape, the length is 4400mm, 44 steps are provided, the axial length of each step is 100mm, and the radius difference of adjacent steps is 0.8 mm;

the inserting depth of the first pipe section 1 and the second pipe section 2 is 400mm, and the length of the tower rod is 12 m.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ladder-shaped conical nodular cast iron pipe is characterized in that: the stepped conical ductile cast iron pipe is in a hollow frustum shape and comprises a socket section positioned at the large end of the stepped conical ductile cast iron pipe, a socket section positioned at the small end of the stepped conical ductile cast iron pipe and a middle section positioned between the socket section and the socket section;

the middle section is in a stepped shaft shape;

the radius difference of adjacent steps in the middle section is a1, the axial length of each step is b1, wherein a1 is 0.7-1.0mm, and b1 is 90-120 mm;

2. A tower rod comprising one or more segments of pipe inserted in the form of a stepped conical ductile iron pipe according to claim 1.