Special core rod head for nitrogen charging and oxidation prevention of rolled copper pipe and copper pipe rolling mill

Abstract

The invention belongs to the technical field of metal pipe machining, and particularly relates to a special core rod head for nitrogen charging and oxidation prevention of a rolled copper pipe, which comprises a cylindrical center rod and nitrogen charging holes, the diameter of the center rod is matched with the specification of the rolled copper pipe, a channel for conveying nitrogen is formed in the center rod, and the nitrogen charging holes are arranged along the radial direction of the center rod. One end is connected with a nitrogen source, and the other end extends into the inner wall of the copper pipe. The invention discloses a special core rod head for nitrogen charging and oxidation prevention of a rolled copper pipe, and aims to improve the product quality and the production efficiency after the copper pipe is rolled. The special core rod head is particularly suitable for the copper pipe rolling process, and the inner wall oxidation problem caused by cooling water residues is effectively prevented. The nitrogen charging core rod head is compact in structure, accurate in design, easy and convenient to operate, low in manufacturing cost, suitable for mass production, easy to maintain and beneficial to reduction of the overall production cost.

Description

Technical Field

[0001] The invention belongs to the technical field of metal pipe processing, and in particular relates to a special mandrel head and a copper pipe rolling mill for copper pipe rolling and nitrogen filling to prevent oxidation. Background Art

[0002] In the copper tube manufacturing industry, rolling is one of the basic process steps to form copper tubes. The copper tube rolling mill transforms copper materials into tubular products with a certain length and wall thickness through continuous rolling. In this process, cooling water residues will adhere to the surface and inner wall of the copper tube. These cooling water residues may form residues under high temperature and pressure, affecting the inner surface quality of the copper tube and subsequent processing procedures. Therefore, cleaning of the copper tube after rolling is very important to ensure product quality.

[0003] In the traditional copper tube rolling process, in order to prevent the copper tube surface from oxidation reaction at high temperature, the copper tube is usually purged with compressed air after rolling to remove the residual cooling water in the tube. However, this method has several disadvantages: First, it increases production steps and reduces production efficiency. Second, the compressed air may not completely remove all oxygen in the tube, and the anti-oxidation effect is limited. Finally, this process also increases energy consumption and production costs. In addition, most of the existing mandrel heads are universal and do not have nitrogen filling function. Moreover, the existing mandrel heads are in a high temperature environment for a long time during the rolling process, and their lifespan is short, which requires replacement. The cumbersome replacement steps also increase labor time. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and solve a series of problems caused by using compressed air to blow away the residual cooling water in the copper tube after the copper tube is rolled (such as extended production cycle, increased energy consumption, increased equipment maintenance costs, etc.). A special mandrel head for nitrogen filling and anti-oxidation during copper tube rolling is provided, which effectively prevents cooling water from entering the inner wall of the copper tube, achieves anti-oxidation, and omits the additional purging step.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A special mandrel head for copper tube rolling and nitrogen filling to prevent oxidation, comprising: The center rod is cylindrical in shape, with a diameter matching the specifications of the copper tube rolling tube, and has a channel for conveying nitrogen inside; The nitrogen filling hole is arranged radially along the center rod, one end of which is connected to the nitrogen source, and the other end of which extends into the inner wall of the copper tube through the gas outlet end.

[0006] The nitrogen filling mandrel head of the present invention adopts a compact external structure and a precise internal nitrogen filling hole design, which is specifically designed to solve the problems of cooling water intrusion and inner wall oxidation during the copper tube rolling process; as a special component, the distribution and aperture of the nitrogen filling holes are designed to match the specifications of the copper tube rolling mill, which can adapt to the rolling of copper tubes of different diameters and ensure nitrogen filling efficiency and anti-oxidation effect.

[0007] In a preferred example, the gas outlet is configured as an annular spherical structure, and the radius of the annular spherical structure is 38 to 42 mm. This design is to avoid damage to the inner wall of the copper tube and ensure that the nitrogen can be evenly distributed on the inner wall of the copper tube.

[0008] In a preferred example, the radius of the annular spherical structure is 40 mm.

[0009] In a preferred example, a mandrel head working surface for increasing a cooling surface is provided on the center rod.

[0010] In a preferred example, the length of the center rod is 190 mm, which is designed to extend the working surface so that the cooling surface of the mandrel head can be increased during the rolling process, thereby improving the life of the mandrel head; In a preferred example, a core rod head replacement platform is provided on the center rod 1, and the thickness of the core rod head replacement platform is 25 to 29 mm. This design is to facilitate the replacement of the core rod head while reducing the problems caused by scratches on the inner wall of the copper tube and delamination of the inner wall.

[0011] In a preferred example, the thickness of the mandrel head replacement platform is 27 mm.

[0012] In a preferred example, the invention further comprises a mandrel head fastening thread for fixing a special mandrel head.

[0013] In a preferred example, a mounting interface is provided at one end of the special mandrel head, the mounting interface is connected to the nitrogen supply system of the copper tube rolling mill, and is provided with a threaded sealing structure to ensure that the nitrogen does not leak.

[0014] Based on a general inventive concept, another object of the present invention is to provide a copper tube rolling mill as mentioned above, including the special mandrel head for nitrogen filling and oxidation prevention of copper tube rolling.

[0015] Compared with the prior art, the nitrogen-filled mandrel head of the present invention is specially designed for anti-oxidation during the copper tube rolling process. The intrusion of cooling water is effectively avoided through synchronous nitrogen filling, and the anti-oxidation effect of the copper tube is improved. The nitrogen filling cooling effect is good. The structural design of the nitrogen filling hole enables the mandrel head to be quickly cooled by gas flushing on the inner wall at high temperature, thereby increasing the life of the mandrel head. It is easy to use and has a simple structural design, so that the mandrel head can be quickly replaced during maintenance, saving waiting time and improving production efficiency. The production cost is low, suitable for mass production, and the maintenance cost is also low, which helps to reduce the overall production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the special mandrel head of the present invention; Figure 2 It is a side sectional view of the special mandrel head of the present invention; Figure 3 It is an enlarged view of the core rod head replacement platform of the present invention; Figure 1-3 The meanings of the symbols are as follows: 1-center rod, 2-nitrogen filling hole, 3-core rod head fastening thread, 4-core rod head replacement platform, 5-core rod head working surface, 6-annular spherical structure, 7-air inlet end. DETAILED DESCRIPTION

[0017] In the description of the present invention, it is necessary to understand that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and the purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the indicated components must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] As used herein, the terms "comprises," "including," "contains," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0019] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood to specifically disclose all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including a range of "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise specified, this range is intended to include its end values ​​and all integers and fractions within this range.

[0020] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] A special mandrel head for copper tube rolling and nitrogen filling to prevent oxidation, comprising: like Figure 1 and Figure 2 As shown, the center rod 1 is cylindrical in shape, and its diameter matches the specification of the copper tube rolling tube. A channel 8 for conveying nitrogen is opened inside, and a nitrogen filling hole 2 is arranged on the center line of the center rod 1 to control the flow direction of nitrogen and ensure uniform anti-oxidation; One end of the nitrogen filling hole 2 is connected to the nitrogen source, and the other end extends into the inner wall of the copper tube through the gas outlet end 7; The nitrogen filling hole 2 is a through hole, and a core rod head fastening thread 3 is provided on one end of the center rod 1 near the nitrogen filling hole 2 for connecting and fixing with the nitrogen filling end rod; The air outlet 7 is configured as an annular spherical structure 6, and the radius of the annular spherical structure 6 is 40 mm; The center rod 1 is provided with a mandrel head working surface 5 for increasing the cooling surface. The length of the center rod 1 is 190 mm, which extends the working surface, so that the cooling surface of the mandrel head can be increased during the rolling process, thereby improving the life of the mandrel head. like Figure 1 and Figure 3 As shown, a mandrel head replacement platform 4 with a thickness of 27 mm is also provided on the center rod 1. After the center rod 1 is connected to the nitrogen-filled end rod, the mandrel head fastening thread 3 is tightened with the nitrogen-filled end rod by clamping the mandrel head replacement platform 4 to ensure the sealing of the nitrogen-filled mandrel head during the rolling process; During operation, nitrogen enters the channel 8 in the center rod 1 through the nitrogen filling hole 2 through the external pipeline, and then is ejected through the gas outlet 7 to form a uniform nitrogen protective layer to prevent oxidation of the copper tube during the rolling process. Since the nitrogen filling mandrel head of the present invention is reasonably designed and has high precision, a uniform nitrogen atmosphere can be formed to achieve an effective anti-oxidation effect.

[0022] The invention discloses a special mandrel head for copper tube rolling and nitrogen filling to prevent oxidation, and aims to improve the product quality and production efficiency of the copper tube after rolling. The special mandrel head is particularly suitable for effectively preventing the inner wall oxidation problem caused by cooling water residue during the copper tube rolling process.

[0023] The nitrogen filling mandrel head of the present invention has a compact structure, precise design, simple operation, low manufacturing cost, is suitable for mass production, is simple to maintain, and helps to reduce the overall production cost.

[0024] The above embodiments are merely preferred implementations of the present invention. Any simple modification, amendment and substitution of the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A special mandrel head for copper tube rolling and nitrogen filling to prevent oxidation, characterized in that: include: The center rod is cylindrical in shape, with a diameter matching the specifications of the copper tube rolling tube, and has a channel for conveying nitrogen inside; The nitrogen filling hole is arranged radially along the center rod, one end of which is connected to the nitrogen source, and the other end of which extends into the inner wall of the copper tube through the gas outlet end.

2. The special mandrel head according to claim 1, characterized in that: The air outlet end is arranged as an annular spherical structure, and the radius of the annular spherical structure is 38-42 mm.

3. The special mandrel head according to claim 2, characterized in that: The radius of the annular spherical structure is 40 mm.

4. The special mandrel head according to claim 1, characterized in that: A core rod head working surface for increasing the cooling surface is arranged on the center rod.

5. The special mandrel head according to claim 4, characterized in that: The length of the center rod is 190mm.

6. The special mandrel head according to claim 1, characterized in that: A core rod head replacement platform is provided on the center rod 1, and the thickness of the core rod head replacement platform is 25-29 mm.

7. The special mandrel head according to claim 6, characterized in that: The thickness of the mandrel head replacement platform is 27mm.

8. The special mandrel head according to claim 1, characterized in that: Also included is a mandrel head fastening thread for securing a special mandrel head.

9. The special mandrel head according to claim 1, characterized in that: One end of the special mandrel head is provided with a mounting interface, the mounting interface is connected to the nitrogen supply system of the copper tube rolling mill, and is provided with a threaded sealing structure.

10. A copper tube rolling mill, characterized in that: The invention comprises a special mandrel head for copper tube rolling and nitrogen filling for anti-oxidation as claimed in any one of claims 1 to 9.

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