CN217104017U

CN217104017U - Large-scale hollow shaft solution treatment protection device

Info

Publication number: CN217104017U
Application number: CN202220818379.7U
Authority: CN
Inventors: 谭秋云; 王小平
Original assignee: Changsha Shangre Heat Treatment Co ltd
Current assignee: Changsha Shangre Heat Treatment Co ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-08-02
Anticipated expiration: 2032-04-08

Abstract

The utility model discloses a large-scale hollow shaft solution treatment protection device, communicate other end extensible to the outlet duct outside the stove, insert and locate including one end and hollow shaft inner chamber in the outlet duct and one end be located the intake pipe of hollow shaft inner chamber other end extensible to the stove outside, with intake pipe one end is connected and is used for providing protective gas's air supply pipe to the hollow shaft inner chamber. The utility model provides a large-scale hollow shaft solution treatment protection device can prevent that the inner chamber wall of large-scale hollow shaft from being by the oxidation in heating heat preservation and cooling process to can guarantee production safety.

Description

Large-scale hollow shaft solution treatment protection device

Technical Field

The utility model relates to a metal material processing technology field, concretely relates to large-scale hollow shaft solution treatment protection device.

Background

The large hollow shaft is a nuclear product, the maximum diameter is 360mm, the total length is up to 6 meters, and the large hollow shaft is made of austenitic stainless steel. The hollow mandrel is formed by three-section welding in the machining process, and solution treatment is needed after welding to improve the corrosion resistance and eliminate welding stress. The temperature of the solution treatment is very high and reaches 1050 ℃, the heat preservation time is long and is about 5 hours, rapid water cooling is needed after the furnace is taken out, and the surface of the steel plate can be oxidized and deformed in the solution treatment process. However, according to the technical requirements, the inner wall cannot be oxidized, and the deformation needs to be solved through straightening and qualitative treatment.

The hollow shaft has two inner cavities, and the corresponding pipe wall of each inner cavity is provided with a small hole respectively, so that uncontrollable deformation or explosion accidents of the thin wall caused by gas expansion during heating can be prevented. If a water cooling process is adopted, explosion can be generated due to rapid gasification of inlet water during water cooling; if the process of vacuumizing and cooling the inner cavity is adopted, the wall thickness of the hollow shaft is only 25mm, so that the hollow shaft is inevitably deformed at high temperature.

Therefore, it is necessary to find a new method to meet the technical requirements and ensure the production safety.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a large-scale hollow shaft solution treatment protection device, can prevent that the inner chamber wall of large-scale hollow shaft from being by the oxidation in heating heat preservation and cooling process to can guarantee production safety.

In order to solve the above problem, the technical scheme of the utility model is as follows:

a large hollow shaft solution treatment protection device comprises an air outlet pipe, an air inlet pipe and an air supply pipe, wherein one end of the air outlet pipe is communicated with an inner cavity of a hollow shaft, the other end of the air outlet pipe can extend out of a furnace, the air inlet pipe is inserted into the air outlet pipe, one end of the air inlet pipe is located in the inner cavity of the hollow shaft, the other end of the air inlet pipe can extend out of the furnace, and the air supply pipe is connected with one end of the air inlet pipe and used for providing protective gas for the inner cavity of the hollow shaft.

Furthermore, the air inlet pipe extends to the inner cavity of the hollow shaft for 180 mm and 220mm, and the air outlet pipe extends to the inner cavity of the hollow shaft for 10-30 mm.

Furthermore, the pipe diameter of the air outlet pipe is 12mm, and the pipe diameter of the air inlet pipe is 5-8 mm.

Further, the opening that the intake pipe is located hollow shaft inner chamber sets up downwards.

Furthermore, the contact position of the air outlet pipe and the wall of the hollow shaft is welded and fixed.

Furthermore, the air outlet pipe and the air inlet pipe penetrate through a furnace cover and extend out of the furnace, wherein the furnace cover is a steel plate with the thickness of 20-40 mm.

Furthermore, the air outlet pipes and the air inlet pipes are respectively divided into two groups, the two groups of air outlet pipes and the two groups of air inlet pipes are in one-to-one correspondence with the inner cavity of the hollow shaft, and the two groups of air inlet pipes are communicated outside the furnace.

Compared with the prior art, the utility model provides a large-scale hollow shaft solution treatment protection device, beneficial effect lies in:

the utility model provides a large-scale hollow shaft solution treatment protection device, through set up with the outlet duct of hollow shaft inner chamber intercommunication, insert locate in the outlet duct and with the intake pipe of hollow shaft inner chamber intercommunication and be used for providing protective gas's air supply pipe to the hollow shaft inner chamber with intake-tube connection, can realize continuously letting in protective gas to the hollow shaft inner chamber in the work piece heating heat preservation cooling process, maintain the malleation state of intracavity, prevent air admission and oxidation hollow shaft inner wall.

Two, the utility model provides a large-scale hollow shaft solution treatment protection device, the work piece water-cooling in-process, intake pipe, outlet duct and air supply pipe go into the water cooling in the lump, treat that the work piece water-cooling can stop the protective gas air feed after to the room temperature, whole in-process can not produce because of the explosive phenomenon that the rapid gasification of intaking arouses, guarantees the security of production.

Drawings

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

Fig. 1 is a schematic structural view of a solution treatment protection device for a large hollow shaft according to the present invention.

Detailed Description

In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the present invention more obvious and understandable, the following description of the embodiments of the present invention is provided with reference to the accompanying drawings.

It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Please refer to fig. 1, which is a schematic structural diagram of a solution treatment protection device for a large hollow shaft according to the present invention. The utility model discloses a large-scale hollow shaft solution treatment protection device for continuously let in protective gas to the hollow shaft inner chamber in the heating heat preservation cooling process to work piece 100 (being the hollow shaft), maintain the malleation state of intracavity. The hollow shaft comprises an air outlet pipe 1 and an air inlet pipe 2 which are communicated with the inner cavity of the hollow shaft, and an air supply pipe 3 which is connected with the other end of the air inlet pipe.

A through hole 102 is formed in the workpiece corresponding to each inner cavity 101, and the air outlet pipe 1 and the air inlet pipe 2 are respectively communicated with the inner cavities 101 through the through holes 102. The outer diameter of the gas outlet pipe 1 is equivalent to the aperture of the through hole 102, and after the gas outlet pipe 1 and the workpiece are assembled, a gap does not exist between the gas outlet pipe 1 and the workpiece, so that external gas can be prevented from entering the inner cavity.

In this embodiment, the air outlet pipe 1 is welded and fixed with the workpiece at the through hole, and the air outlet pipe 1 extends to the inner cavity of the hollow shaft by 10-30mm, and the diameter of the air outlet pipe is 12mm corresponding to the aperture of the through hole. In the heating and heat preservation process, the other end of the air outlet pipe 1 extends out of the furnace, and in the water cooling process, the air outlet pipe is integrally cooled by water along with the workpiece.

The air inlet pipe 2 is inserted into the air outlet pipe 1, one end of the air inlet pipe extends to the inner cavity of the hollow shaft, and the other end of the air inlet pipe is connected with the air supply pipe 3. In the heating and heat preservation process, the air inlet pipe 2 extends out of the furnace; in the water cooling process, the air inlet pipe is integrally cooled by water together with the workpiece.

The outer diameter of the air inlet pipe 2 is 5-8mm smaller than the inner diameter of the air outlet pipe 3, and a certain gap is formed between the air inlet pipe and the air outlet pipe, so that when protective gas is introduced into the inner cavity of the hollow shaft after a workpiece is placed into the furnace and sealed, the gas in the inner cavity is continuously discharged out of the furnace through the gap between the air inlet pipe and the air outlet pipe to remove the air in the inner cavity.

In this embodiment, the air inlet pipe 2 extends to the hollow shaft cavity 180-220mm, and the opening of the hollow shaft cavity is disposed downward.

The gas supply pipe 3 is connected with one end of the gas inlet pipe 2 and used for providing protective gas for the inner cavity of the hollow shaft, wherein the protective gas can be nitrogen, argon, helium and the like. Specifically, the air supply pipe 3 is a hose and is always connected with an air inlet pipe in the heat preservation, heating and water cooling process, and the length of the hose is ensured not to influence hoisting when a workpiece is discharged from a furnace and cooled by water.

The utility model discloses in, the quantity of hollow shaft inner chamber is two, correspondingly, and the intake pipe and the outlet duct of hollow shaft are two sets of respectively, with hollow shaft inner chamber one-to-one, and two sets of intake pipes communicate outside the stove. The two groups of air inlet pipes are communicated outside the furnace and then connected with an air supply pipe through a three-way pipe.

It should be noted that, when the large hollow shaft solution treatment protection device of the present invention is in the heating and heat preservation process, the outlet pipe 1 and the inlet pipe 2 penetrate through the furnace cover 200 and extend to the outside of the furnace, the furnace cover 200 is correspondingly provided with connecting holes for inserting the outlet pipe, the inlet pipe and the lifting lugs, and the furnace cover 200 is a steel plate with a thickness of 20-40 mm. In order to reduce the heat loss during the heating and heat preservation, a heat preservation fiber layer 300 can be arranged on the furnace cover 200.

The utility model discloses a large-scale hollow shaft solution treatment protection device, the mounting process of intake pipe and outlet duct is as follows:

taking two small pipes as air inlet pipes, wherein one end of each small pipe is vertically bent to form a section, and the opening of the end is downward and is used as an air inlet;

taking two large pipes as air outlet pipes, respectively cutting a section (short pipe) at one end, wherein the length is 130mm and 90mm respectively, and the remaining section is a long pipe; inserting one end of each of the two cut short pipes into the hole for about 30mm, welding the periphery of the short pipe with the workpiece, forming a groove (45 degrees) at the other end of the short pipe, sleeving a long pipe of an air outlet pipe outside the small pipe, and welding the turning parts of the two large pipes after adjusting the direction of the long pipe, wherein the welding line has no crack and has no error in flaw detection;

the two air inlet pipes are connected through a tee joint which is connected with an air supply pipe.

The utility model discloses a large-scale hollow shaft solution treatment protection device, the theory of operation as follows:

(1) assembling the air inlet pipe, the air outlet pipe and the workpiece, and connecting the air inlet pipe with the air supply pipe;

(2) introducing nitrogen into the workpiece at an atmospheric quantity for more than or equal to 2 hours after the workpiece enters the furnace and is sealed so as to remove air in the inner cavity, and then reducing air inflow and maintaining the inner cavity at a positive pressure;

(3) and after the heating and heat preservation are finished, the workpiece is lifted out and is cooled by water together with the pipe furnace cover, the nitrogen gas can be closed after the workpiece is cooled to the room temperature by the water, and the gas inlet and outlet pipe is cut off.

(4) And (5) detecting the oxidation condition and deformation condition of the inner wall, and if the deformation exceeds the standard, performing straightening and qualitative treatment.

Two, the utility model provides a large-scale hollow shaft solution treatment protection device, the work piece water-cooling in-process, intake pipe, outlet duct and air supply pipe go into the water cooling in the lump, treat that the work piece water-cooling can stop the protective gas air feed after to the room temperature, can not produce the explosion phenomenon that arouses because of the rapid gasification of intaking in the whole engineering, guarantee the security of production.

The embodiments of the present invention are described in detail with reference to the drawings, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions and alterations to these embodiments will occur to those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. A large hollow shaft solution treatment protection device is characterized by comprising an air outlet pipe, an air inlet pipe and an air supply pipe, wherein one end of the air outlet pipe is communicated with an inner cavity of a hollow shaft, the other end of the air outlet pipe can extend out of a furnace, the air inlet pipe is inserted into the air outlet pipe, one end of the air inlet pipe is located in the inner cavity of the hollow shaft, the other end of the air inlet pipe can extend out of the furnace, and the air supply pipe is connected with one end of the air inlet pipe and used for providing protection gas for the inner cavity of the hollow shaft.

2. The large hollow shaft solution treatment protection device according to claim 1, wherein said air inlet pipe extends to 180-220mm of the hollow shaft inner cavity, and said air outlet pipe extends to 10-30mm of the hollow shaft inner cavity.

3. A large hollow shaft solution treatment protection device according to claim 2, wherein the pipe diameter of said outlet pipe is 12mm and the pipe diameter of said inlet pipe is 5-8 mm.

4. The large hollow shaft solution treatment protection device according to claim 2, wherein the air inlet pipe is positioned at the opening of the inner cavity of the hollow shaft and faces downwards.

5. The large hollow shaft solution treatment protection device according to claim 1, wherein the contact position of the gas outlet pipe and the wall of the hollow shaft is welded and fixed.

6. The large hollow shaft solution treatment protection device according to claim 1, wherein the gas outlet pipe and the gas inlet pipe extend out of the furnace through a furnace cover, wherein the furnace cover is a steel plate with a thickness of 20-40 mm.

7. The large hollow shaft solution treatment protection device according to any one of claims 1 to 6, wherein the gas outlet pipe and the gas inlet pipe are respectively provided in two groups, one-to-one corresponding to the inner cavity of the hollow shaft, and the two groups of gas inlet pipes are communicated outside the furnace.