CN108070701A - A kind of annular quenching unit and its application process - Google Patents

Abstract

The invention provides an annular quenching device and its application method, comprising a water spray ring, a machine cover, a conveying roller table, a frame, a lifting and guiding device, a water tank, the water spray ring and the machine cover are placed on the frame, and the machine cover The water spray ring is covered with the frame, the lower surface of the frame is connected with the lifting and guiding device, and the water tank is below the frame. There are multiple groups of water spray rings, each group is independently controlled, and the water volume of each water spray ring can be adjusted according to the process. The lifting and guiding device can make the water spray ring, the machine cover and the frame rise and fall by a certain distance to ensure that the height of the water spray ring is consistent with the center of the steel pipe. The nozzle device in the water spray ring can rotate at a certain angle as a whole to ensure that the water sprayed from the nozzle is sprayed on the outer surface of the steel pipe in a tangential direction, so as to break up the steam film generated on the surface of the steel pipe during quenching, improve the heat exchange condition of the steel pipe surface, and improve the temperature of the steel pipe. The cooling speed ensures that the quenched martensite structure is obtained, and prevents the quenching water from flowing back into the quenching furnace from the inner wall of the steel pipe.

Description

A ring quenching device and its application method

technical field

The invention belongs to the technical field of steel pipe quenching, and in particular relates to an annular quenching device and an application method thereof.

Background technique

When quenching the steel pipe, the water on the surface of the steel pipe is heated and vaporized to form a layer of steam film to isolate the steel pipe from water. Since the steam film is a poor conductor of heat, the cooling speed of the steel pipe is reduced. The cooling rate of the steel pipe during quenching must exceed the critical cooling rate in order to obtain the required martensitic structure. Therefore, during the quenching process, it is necessary to continuously break up the steam film produced on the surface of the steel pipe during quenching, improve the heat transfer conditions on the surface of the steel pipe, increase the cooling speed of the steel pipe, and ensure that the quenched martensite structure is obtained. This puts forward higher requirements on the water spray equipment of the quenching device.

At present, the steel pipe quenching processes on the market include "external shower + internal spray" quenching and "immersion quenching + internal spray" quenching, which are suitable for quenching steel pipes with thick walls. The quenching devices corresponding to these two processes are relatively large, It occupies a large area, has high investment costs, and has high requirements on the heating furnace, so it can only be used in conjunction with a walking heating furnace. For thin-walled steel pipes, the return on investment of the above two quenching devices is not high.

Contents of the invention

The object of the present invention is to provide an annular quenching device and its application method, so as to overcome the problem of large investment and low rate of return when the existing steel tube quenching device is used to produce thin-walled steel pipes.

For this reason, the present invention provides an annular quenching device, comprising a water spray ring, a frame and a conveying roller table, the water spray ring is installed vertically on the frame, and the conveying roller table is placed on the ground perpendicular to the central axis of the water spray ring, And the conveying roller table is located below the central axis of the water spray ring.

The water spray ring includes a water supply pipe, the water supply pipe is an annular steel pipe, and several branch pipes connected with the annular steel pipe are evenly distributed on both sides of the water supply pipe. Connect the nozzle main pipe, and install several nozzles at the end of the nozzle main pipe.

The water supply pipe is an annular structure formed by connecting two semicircular steel pipes through flanges.

It also includes a machine cover covering the water spray ring to prevent the quenching water from splashing around.

The bottom of the frame is equipped with a lifting guide device that drives its lifting.

The lower surface of the frame is perforated and a deflector is welded to guide the quenching water, and a water tank is arranged under the deflector.

An application method of an annular quenching device, in which multiple groups of water spray rings are installed along a straight line on the frame, driven by the conveying roller table, the steel pipes pass through the water spray rings while rotating to complete the quenching of the steel pipes; for steel pipes with different diameters When quenching, the power device in the water spray ring drives the swing arm to rotate a certain angle around the center line of the branch pipe, so that the water sprayed from the nozzle is sprayed on the outer surface of the steel pipe in a tangential direction.

The conveying roller table is driven by a motor, and the axis of the conveying roller table is arranged with an inclination of 5° to the center line of the steel pipe.

Beneficial effects of the present invention:

(1) The annular quenching device and its application method provided by the present invention can be used in conjunction with a walking heating furnace and an intermediate frequency induction heating furnace, and there are many types of heating furnaces suitable for matching;

(2) Ensure that the water sprayed from the nozzle is sprayed onto the outer surface of the steel pipe in a tangential direction to ensure the cooling speed of the steel pipe and obtain the quenched martensite structure;

(3) From the running direction of the steel pipe, the water sprayed from the nozzle forms a hollow, so that the quenching water cannot enter the inner wall of the steel pipe, preventing the quenching water from flowing back into the heating furnace along the inner wall of the steel pipe;

(4) The specification of the nozzle device is reduced, which saves the cost;

(5) The replacement time of the nozzle device is reduced, the adjustment of the nozzle angle is simple and quick, the labor force is reduced, and the production efficiency is improved;

(6) The amount of quenching water can be adjusted in sections to adapt to the quenching process of steel pipes of different specifications;

(7) The hood and frame cover the equipment, and the quenching water flows into the water tank from the water guide plate under the frame to prevent the quenching water from splashing;

(8) The water supply pipe is connected by half flange, which is convenient for the installation and replacement of the nozzle.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a front view of the annular quenching device.

Fig. 2 is a left sectional view of the annular quenching device.

Explanation of reference numerals: 1, water spray ring; 2, machine cover; 3, conveying roller table; 4, frame; 5, lifting guide device; 6, water tank; 7, nozzle; 8, nozzle main pipe; 9, swing arm ; 10, branch pipe; 11, water supply pipe; 12, power unit; 13, flange; 14, deflector.

Detailed ways

Example 1:

The present invention provides a kind of annular quenching device as shown in Fig. 1 and Fig. 2, comprise water spray ring 1, frame 4 and conveying roller table 3, water spray ring 1 is vertically installed on frame 4, conveying roller table 3 It is placed on the ground perpendicular to the central axis of the water spray ring 1, and the conveying roller table 3 is located below the central axis of the water spray ring 1.

The working process of the ring quenching device is as follows:

Multiple groups of water spray rings 1 are installed in a straight line on the frame 4, and the steel pipes are driven by the conveying roller table 3 to rotate and pass through the water spray rings 1 forward, and the water sprayed by the water spray rings 1 is sprayed onto the outer surface of the steel pipes in a tangential direction. Guarantee the cooling speed of the steel pipe to ensure that the quenched martensite structure is obtained until the quenching is completed.

Seen from the running direction of the steel pipe, the water sprayed by the water spray ring 1 forms a hollow, so that the quenching water cannot enter the inner wall of the steel pipe, preventing the quenching water from flowing back into the heating furnace along the inner wall of the steel pipe.

The annular quenching device and its application method provided by the present invention can be matched with a walking heating furnace and a medium-frequency induction heating furnace, and there are many types of heating furnaces suitable for matching.

Example 2:

On the basis of Embodiment 1, as shown in Figure 1 and Figure 2, the water spray ring 1 includes a water supply pipe 11, the water supply pipe 11 is an annular steel pipe, and several branches connected with the annular steel pipe are installed evenly on both sides along the circumferential direction Pipe 10, branch pipe 10 is vertically connected with swing arm 9, and one end of swing arm is driven by power unit 12, and the other end is connected with nozzle main pipe 8, and several nozzles 7 are installed at the end of nozzle main pipe 8.

It should be noted that since the power device 12 is a prior art, its specific structure is not taken as the protection point of the present invention, and will not be described in detail here.

The power device 12 in the water spray ring 1 drives the swing arm 9 to rotate a certain angle around the center line of the branch pipe 10, so that the water sprayed from the nozzle 7 is sprayed on the outer surface of the steel pipe in a tangential direction; The outlet flow is stable and the injection pressure is high. The power device can drive the swing arm to rotate the nozzle at a certain angle to ensure that the water ejected from the nozzle is sprayed on the outer surface of the steel pipe in a tangential direction, breaking up the steam film produced on the surface of the steel pipe during quenching, and improving The heat exchange conditions on the surface of the steel pipe increase the cooling speed of the steel pipe to ensure the quenched martensite structure.

Viewed from the running direction of the steel pipe, the water ejected from the nozzle forms a hollow, which prevents the quenching water from entering the inner wall of the steel pipe and prevents the quenching water from flowing back into the heating furnace along the inner wall of the steel pipe. When changing steel pipe specifications, for steel pipes with different diameters, all nozzle angles can be adjusted by simply adjusting the power unit, reducing the nozzle device specifications, saving the time for changing nozzle specifications, reducing the time for adjusting nozzle angles, and saving costs and labor force and increase production efficiency.

Example 3:

On the basis of Embodiment 1, the lifting guide device 5 driving its lifting is installed below the frame 4. It should be noted that the lifting guide device 5 is an existing structure. As a preference, the present embodiment selects an oil cylinder or an electric motor Push rod, lifting guiding device 5 drive frame 4 overall lifting, make water spray ring, machine cover and frame integral lift certain distance, guarantee that water spray ring is consistent with steel pipe center height.

The annular quenching device also includes a machine cover 2 that is covered on the water spray ring 1 to prevent the quenching water from splashing everywhere. The frame 4 and the machine cover 2 cover the water spray ring together to prevent the quenching water from splashing everywhere.

The lower surface of the frame 4 is perforated and welded with a deflector 14 to divert the quenching water. A water tank 6 is arranged below the deflector 14 to guide the quenching water into the water tank 6 . The water supply pipe 11 is an annular structure formed by connecting two semicircular steel pipes through flanges 13. When installing and replacing the nozzle 7, the flanges 13 are opened for easy operation.

Example 4:

This embodiment provides an application method of an annular quenching device. Multiple groups of water spray rings 1 are installed on the frame 4 along a straight line. Driven by the conveying roller table 3, the steel pipe passes through the water spray ring 1 while rotating to complete the steel pipe. When quenching steel pipes with different diameters, the power device 12 in the water spray ring 1 drives the swing arm 9 to rotate a certain angle around the center line of the branch pipe 10, so that the water sprayed from the nozzle 7 is sprayed out of the steel pipe in a tangential direction surface.

As shown in Figure 2, multiple groups of water spray rings 1 are provided, and each group is independently controlled, and the water volume of each water spray ring 1 can be adjusted according to the process.

Example 5:

The conveying roller table 3 is driven by a motor, and the axis of the conveying roller table 3 is arranged at an inclination of 5° to the centerline of the steel pipe, so that the steel pipe is transported forward while rotating, preventing uneven cooling of the steel pipe and causing the steel pipe to bend.

Embodiment 6:

This embodiment is preferred, and as shown in accompanying drawing 2, there are two sets of annular quenching devices, which are installed on the frame 4. When quenching steel pipes with different pipe diameters, it is necessary to first adjust the power unit 12 to make it drive the swing arm 9 Rotate a certain angle around the center line of the branch pipe 10 to ensure that the water sprayed from the nozzle 7 is sprayed on the outer surface of the steel pipe in a tangential direction, and then the steel pipe is placed on the conveying roller table 3, and the steel pipe passes forward while rotating under the drive of the conveying roller table 3 The water spray ring 1 completes the quenching of the steel pipe. The water sprayed from the water spray ring 1 forms a hollow, so that the quenching water cannot enter the inner wall of the steel pipe, preventing the quenching water from flowing back into the heating furnace along the inner wall of the steel pipe; the frame 4 and the hood 2 cover the water spray ring together to prevent quenching Water splashes everywhere. The lower surface of the frame 4 is perforated and welded with a deflector 14 to divert the quenching water. A water tank 6 is arranged below the deflector 14 to guide the quenching water into the water tank 6 . The water supply pipe 11 is an annular structure formed by connecting two semicircular steel pipes through flanges 13. When installing and replacing the nozzle 7, the flanges 13 are opened for easy operation. The annular quenching device and its application method provided by the present invention can be matched with a walking heating furnace and a medium-frequency induction heating furnace, and there are many types of heating furnaces suitable for matching.

To sum up, the annular quenching device can be used in conjunction with the walking heating furnace and the intermediate frequency induction heating furnace, and there are many forms of suitable heating furnaces. In ring quenching, nozzle injection can ensure stable spray water flow and high spray pressure. The power device can drive the swing arm to make the nozzle rotate at a certain angle to ensure that the water sprayed from the nozzle is sprayed on the outer surface of the steel pipe in a tangential direction. Disperse the steam film produced on the surface of the steel pipe during quenching, improve the heat transfer conditions of the steel pipe surface, increase the cooling speed of the steel pipe, and ensure the quenched martensite structure. Viewed from the running direction of the steel pipe, the water ejected from the nozzle forms a hollow, which prevents the quenching water from entering the inner wall of the steel pipe and prevents the quenching water from flowing back into the heating furnace along the inner wall of the steel pipe. When changing steel pipe specifications, for steel pipes with different diameters, all nozzle angles can be adjusted by simply adjusting the power unit, reducing the nozzle device specifications, saving the time for changing nozzle specifications, reducing the time for adjusting nozzle angles, and saving costs and labor force and increase production efficiency. The amount of quenching water can be adjusted in sections to adapt to the quenching process of steel pipes of different specifications. The hood and frame cover the water spray ring to prevent splashing of quenching water. The water supply pipe adopts half-flange connection, which is convenient for the installation and replacement of the nozzle.

The above examples are only illustrations of the present invention, and do not constitute a limitation to the protection scope of the present invention. All designs that are the same as or similar to the present invention fall within the protection scope of the present invention. The components and structures not described in detail in this embodiment are known components and common structures or common means in this industry, and are not described here one by one.

Claims (8)

1. a kind of annular quenching unit, it is characterised in that：Including water ring（1）, rack（4）And rollgang（3）, water ring （1）It is vertical to be mounted on rack（4）On, rollgang（3）Perpendicular to water ring（1）Central axis is placed in ground, and rollgang （3）Positioned at water ring（1）Below central axis.

2. annular quenching unit as described in claim 1, it is characterised in that：The water ring（1）Including feed pipe（11）, supply Water pipe（11）For annular steel pipe, both sides, which are evenly distributed, installs several branched pipes connected with annular steel pipe（10）, branch Pipe（10）Vertical connection swing arm（9）, swing arm one end is by power set（12）Driving, other end connection spray nozzle manifold（8）, nozzle Manifold（8）End is installed by several nozzles（7）.

3. annular quenching unit as claimed in claim 2, it is characterised in that：The feed pipe（11）It is by two semicircle steel Pipe passes through flange（13）The loop configuration being connected as one.

4. annular quenching unit as described in claim 1, it is characterised in that：It further includes and covers on water ring（1）On prevent from quenching The hood of water splash everywhere（2）.

5. annular quenching unit as described in claim 1, it is characterised in that：The rack（4）Lower section be installed with driving its The lifting and guiding device of lifting（5）.

6. annular quenching unit as described in claim 1, it is characterised in that：The rack（4）Lower surface perforate and weld lead Flowing plate（14）Water conservancy diversion quenches water, deflector（14）Lower section is equipped with sink（6）.

7. a kind of application process of annular quenching unit, it is characterised in that：In rack（4）On along straight line multigroup water ring is installed （1）, in rollgang（3）The lower steel pipe of driving is advanced through water ring in rotation（1）, complete the quenching of steel pipe；To different pipes When the steel pipe in footpath is quenched, water ring（1）Interior power set（12）Drive swing arm（9）Around branched pipe（10）Center line rotates Certain angle makes nozzle（7）The water of ejection is ejected into outer surface of steel tube with tangential direction.

8. the application process of annular quenching unit as claimed in claim 7, it is characterised in that：The rollgang（3）By electricity Machine drives, rollgang（3）5 ° of arrangements of axis and steel pipe centerline dip.