CN111589884A - Inner wall cooling system and cooling method for on-line cooling process of hot-rolled seamless steel pipe - Google Patents

Abstract

The invention discloses an inner wall cooling system and a cooling method for an on-line cooling process of a hot-rolled seamless steel pipe, and relates to the technical field of hot-rolled seamless steel pipe production. The main purpose is to ensure the cooling uniformity in the thickness direction of the steel pipe. The system includes an automatic control device, a plurality of water spraying devices and at least one air blowing device; the air blowing device includes a main body provided with an air inlet and a plurality of first nozzles, each of the first nozzle groups of the plurality of first nozzles The center line of the nozzle and the center line of each nozzle in the second nozzle group respectively have a first included angle and a second included angle with the horizontal plane, the first included angle is greater than the second included angle, and the air inlet is communicated with the compressed air source; The water device includes a lifting mechanism and a pipe body arranged on it. One end of the pipe body is communicated with the shunt water collection pipe, and the other end is provided with a spray head. The spray head has a plurality of second nozzles, and the plurality of second nozzles are respectively arranged with the pipe body at different angles. ; The automatic control device is electrically connected with the compressed air source, the nozzle and the lifting mechanism respectively.

Description

Inner wall cooling system and cooling method for on-line cooling process of hot-rolled seamless steel pipe

technical field

The invention relates to the technical field of hot-rolled seamless steel pipe production, in particular to an inner wall cooling system and a cooling method for an on-line cooling process of a hot-rolled seamless steel pipe.

Background technique

It is the key direction for the development of new products and new processes of hot-rolled seamless steel pipes to realize the onlineization of the off-line heat treatment process and give full play to the organization and regulation of the controlled rolling and controlled cooling process. The currently disclosed on-line control cooling technology of hot-rolled seamless steel pipe mainly adopts the method of spraying water on the outer wall of the steel pipe in the cooling process, which has a good hardening effect for the steel pipe with thin wall thickness or strong hardenability. However, for thick-walled steel pipes and steel pipes with poor hardenability, the cooling strength of the outer wall of the steel pipe is relatively large, while the cooling strength of the inner wall is relatively low, resulting in uneven structure of the inner and outer walls and reducing the cooling uniformity in the thickness direction of the steel pipe.

SUMMARY OF THE INVENTION

In view of this, the embodiment of the present invention provides an inner wall cooling system and a cooling method for an on-line cooling process of a hot-rolled seamless steel pipe, the main purpose of which is to improve the cooling strength of the inner wall of the steel pipe and avoid the large surface subcooling degree during the on-line cooling of the steel pipe. As a result, the uniformity of the inner and outer walls of the steel pipe is poor, so as to ensure the cooling uniformity in the thickness direction of the steel pipe.

To achieve the above purpose, the embodiments of the present invention mainly provide the following technical solutions:

In one aspect, an embodiment of the present invention provides an inner wall cooling system for an on-line cooling process for hot-rolled seamless steel pipes, which is installed in an on-line cooling device for hot-rolled seamless steel pipes, including an automatic control device, a plurality of water spraying devices and at least an air blower;

The water spray device is used to be arranged at the inlet of the cooling spray ring group of the online cooling device, between two adjacent groups of cooling spray ring groups or at the outlet of the cooling spray ring group; at least one of the air blowing devices is used for Correspondingly arranged at the top of the end face of the outlet end of at least one group of the cooling spray ring groups behind the water spray device;

The air blowing device includes a main body, and the main body is provided with a connected air inlet and a plurality of first nozzles, and the plurality of first nozzles include a first nozzle group and a second nozzle group, the first nozzles The center line of each nozzle in the group and the center line of each nozzle in the second nozzle group respectively have a first included angle and a second included angle with the horizontal plane, and the first included angle is greater than the second included angle angle, the air inlet communicates with the compressed air source;

The water spraying device includes a lifting mechanism and a pipe body arranged on the lifting mechanism. One end of the pipe body is communicated with the branching water collection pipe through a valve group and a water pipe, and the other end is provided with a spray head, and the spray head has a plurality of nozzles. second nozzles, a plurality of the second nozzles are respectively arranged at an angle with the pipe body, and the angles are different from each other;

The automatic control device is respectively electrically connected with the compressed air source, the spray head and the lifting mechanism.

Further, limit switches electrically connected to the automatic control device are respectively provided on the lifting mechanism at both ends of its stroke;

The lifting mechanism is also provided with a displacement sensor electrically connected with the automatic control device.

Further, the spray head is an axial flow spray head.

Further, the angle ranges of the first included angle and the second included angle are both 30-75°.

Further, a plurality of the second nozzles are respectively arranged at an angle with the pipe body, and the angle ranges from 0° to 30°.

Further, the pressure range of the compressed air source is 0.4-1.0 Mpa;

The spray pressure of the spray head ranges from 0.2 to 0.8 Mpa.

On the other hand, the embodiment of the present invention also provides a cooling method for the inner wall cooling system of the online cooling process of the hot-rolled seamless steel pipe, including:

When the tail of the steel pipe reaches the water spray device, the falling edge of the corresponding hot metal detector is triggered, and the automatic control device controls the lifting mechanism to drive the spray head to move up and down, so that the spray head reaches a preset height, and controls the spray head to open spraying cooling water into the steel pipe to cool the inner wall of the steel pipe;

When the automatic control device tracks the tail of the steel pipe to the air blowing device, it controls the air blowing device to open to blow compressed air into the steel pipe, so as to increase the flow speed of the cooling water on the inner wall of the steel pipe, Thereby, the cooling efficiency of the inner wall of the steel pipe is improved.

By the above-mentioned technical scheme, the present invention at least has the following beneficial effects:

The technical solution provided by the embodiment of the present invention includes an automatic control device, a plurality of water spraying devices and at least one air blowing device; and the plurality of water spraying devices are respectively arranged between two adjacent groups of cooling spray rings in the online cooling device. At least one air blowing device is correspondingly arranged on the top of the outlet end face of at least one group of cooling spray rings behind the water spray device, so that the automatic control device can control the water spray device to spray high-pressure cooling water to the inner wall of the steel pipe, so as to realize the cooling effect of the steel pipe. The inner wall is cooled, and at the same time, the automatic control device can also control the air blowing device to blow compressed air to the inner wall of the steel pipe after the cooling water is sprayed, thereby increasing the flow rate of the cooling water on the inner wall of the steel pipe. The air blowing device can not only realize the cooling of the inner wall of the steel pipe, but also speed up the flow rate of the cooling water on the inner wall of the steel pipe, effectively improve the cooling efficiency and cooling uniformity of the inner wall of the steel pipe, and ensure the cooling uniformity in the thickness direction of the steel pipe.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

1 is a schematic structural diagram of a water spray device of an inner wall cooling system of a hot-rolled seamless steel tube online cooling process provided by an embodiment of the present invention;

2 is a schematic structural diagram of an air blowing device of an inner wall cooling system of a hot-rolled seamless steel tube on-line cooling process provided by an embodiment of the present invention;

3 is a schematic structural diagram of an inner wall cooling system of an online cooling process for a hot-rolled seamless steel tube provided in an embodiment of the present invention, which is arranged in an online cooling device.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, of the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of this embodiment, it should be understood that the terms "center", "portrait", "horizontal", "front", "rear", "left", "right", "vertical", "horizontal" , "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or It is implied that the indicated device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the protection scope of this embodiment.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , an embodiment of the present invention provides an inner wall cooling system for an on-line cooling process for hot-rolled seamless steel pipes, which is installed in an on-line cooling device for hot-rolled seamless steel pipes, which includes automated A control device, a plurality of water spraying devices 1 and at least one air blowing device 2; the water spraying device 1 is used to be arranged at the inlet of the cooling spray ring group of the online cooling device, between two adjacent groups of cooling spray ring groups or cooling spray rings At the outlet of the group; at least one air blowing device 2 is correspondingly arranged on the top of the outlet end face of at least one group of cooling spray ring groups behind the water spray device 1; wherein, the air blowing device 2 includes a main body 21, and the main body 21 is provided with connected The air inlet 211 and a plurality of first nozzles 212, the plurality of first nozzles 212 include a first nozzle group 212a and a second nozzle group 212b, the centerline of each nozzle in the first nozzle group 212a and the second nozzle group The centerline of each nozzle in 212b has a first included angle and a second included angle with the horizontal plane respectively. It should be noted here that the steel pipe moves along the horizontal plane, that is, the centerline of each nozzle in the first nozzle group 212a and the second included angle. The center line of each nozzle in the two nozzle groups 212b has a first included angle and a second included angle with the axis of the steel pipe respectively, and the first included angle is greater than the second included angle. The air inlet 211 is in communication with the compressed air source, and , the nozzles in the first nozzle group 212a and the second nozzle group 212b can be arranged in a uniform array; the water spray device 1 includes a lifting mechanism 11 and a pipe body 12 arranged on the lifting mechanism 11, and one end of the pipe body 12 passes through the valve group. The water pipe is communicated with the shunt water collection pipe, and the other end is provided with a nozzle 13. The nozzle 13 can be a high-pressure axial-flow nozzle 13, and the nozzle 13 has a plurality of second nozzles 131. The plurality of second nozzles 131 are respectively connected to the pipe body. 12 is arranged at an angle, and the angles are different, and the plurality of second nozzles can be arranged in a uniform array; the automatic control device is electrically connected to the compressed air source, the nozzle 13 and the lifting mechanism 11 respectively. Wherein, the lifting mechanism 11 can be driven by a hydraulic system, and specifically it can be a hydraulic cylinder or the like. Specifically, the reference number "20" in Fig. 2 represents a steel pipe; the reference number "10" in Fig. 3 represents a cooling spray ring group, and the reference number "101" represents a cooling spray ring.

The inner wall cooling system of the hot-rolled seamless steel pipe online cooling process provided by the embodiment of the present invention includes an automatic control device, a plurality of water spraying devices 1 and at least one air blowing device 2; and the water spraying device 1 is used to be arranged in the online cooling device. At the entrance of the cooling spray ring group, between adjacent two groups of cooling spray ring groups or at the outlet of the cooling spray ring group; at least one air blowing device 2 is used for at least one set of cooling spray ring group correspondingly arranged behind the water spray device 1 The top of the end face of the outlet end, so that the automatic control device can control the water spray device 1 to spray high-pressure cooling water to the inner wall of the steel pipe, so as to achieve cooling of the inner wall of the steel pipe. At the same time, the automatic control device can also control the air blowing device 2 to spray the cooling water. Compressed air is blown on the inner wall to increase the flow rate of the cooling water on the inner wall of the steel pipe. That is to say, the embodiment of the present invention adopts the water spray device 1 and the air blowing device 2, which can not only realize the cooling of the inner wall of the steel pipe, but also accelerate the cooling water of the inner wall of the steel pipe. The flow speed of the steel pipe effectively improves the cooling efficiency and cooling uniformity of the inner wall of the steel pipe, and ensures the cooling uniformity in the thickness direction of the steel pipe.

It should be noted that, by arranging the water spraying device 1 between two adjacent cooling spray ring groups, and each water spraying device 1 is equipped with an independent lifting mechanism 11, each water spraying device 1 can be lifted and lowered by its own The mechanism 11 moves up and down to spray cooling water to the inner wall of the steel pipe without moving with the steel pipe, which is more convenient to use and simpler in structure. Moreover, the plurality of second nozzles 131 of the spray head 13 in the water spray device 1 are respectively arranged at an angle with the pipe body 12 , that is, the center line of the second nozzles 131 and the axis of the pipe body 12 have an included angle, and the angles of the included angles are different from each other. Different, such a structure arrangement can make the cooling water sprayed into the steel pipe by the water spray device 1 more dispersed, thereby better cooling the inner wall of the steel pipe, and can also improve the uniformity of cooling. At the same time, by setting the air blowing device 2 on the top of the outlet end face of the cooling spray ring group, that is, the top of the side surface of the cooling spray ring at the outlet end, it is convenient for it to blow compressed air into the inner wall of the steel pipe that reaches the tail. The center line of each nozzle in the first nozzle group 212a and the center line of each nozzle in the second nozzle group 212b respectively have a first included angle and a second included angle with the horizontal plane, that is, with the steel pipe, and the first included angle The angle is greater than the second angle, so that when the tail of the steel pipe reaches, the first nozzle group 212a and the second group of nozzles 131 212b can jointly blow compressed air into the inner wall of the steel pipe, and when the tail of the steel pipe leaves, the air blowing device 2 can still pass through the first The group of two nozzles 131 212b blows a relatively large amount of compressed air into the inner wall of the steel pipe, thereby further increasing the flow rate of the cooling water on the inner wall of the steel pipe and improving the cooling efficiency.

In an optional embodiment, referring to FIG. 3 , there may be six air blowing devices 2 and two water spraying devices 1 , and the two water spraying devices 1 are respectively installed at the inlets of the first cooling spray ring group. and between the fourth and fifth groups of cooling spray ring groups, the air blowing device 2 is respectively arranged on the top of the outlet end face of the first, second, third, fifth, sixth and seventh groups of cooling spray ring groups, and the automatic control device It is used to control the electrical connection between the water spraying device 1 and the air blowing device 2, and is used to control their respective actions to realize online cooling process control. It should be noted here that, in order to ensure that the air blowing device 2 and the water spraying device 1 can work together effectively, the air blowing device 2 may not be provided on a group of cooling spray rings before the water spraying device 1 .

In an optional embodiment, the lift mechanism 11 is provided with limit switches electrically connected to the automatic control device at both ends of its stroke; the lift mechanism 11 is also provided with a displacement sensor electrically connected to the automatic control device. Among them, the automatic control device is used to limit the lifting height of the nozzle 13 through the limit switch, and the displacement sensor is used to detect the displacement of the nozzle 13, so that the automatic control device can be controlled according to the diameter of the steel pipe, the limit switch and the signals sent by the displacement sensor. The lifting mechanism 11 drives the nozzle 13 to move up and down and can be concentric with the steel pipe. After the nozzle 13 is concentric with the steel pipe, the nozzle 13 is controlled to spray cooling water into the inner wall of the steel pipe, which further improves the cooling effect and uniformity of the inner wall of the steel pipe. .

Wherein, the angle ranges of the first included angle and the second included angle may both be 30° to 75°. Specifically, the angle of the first included angle may be 50°, and the angle of the second included angle may be 30°. Moreover, the plurality of second nozzles 131 are respectively arranged at an angle with the pipe body 12 , and the angle may range from 0° to 30°. In addition, the pressure range of the compressed air source can be 0.4-1.0Mpa; and the water spray pressure of the nozzle 13 can be 0.2-0.8Mpa.

The embodiment of the present invention also provides a cooling method for the inner wall cooling system of the online cooling process of the hot-rolled seamless steel pipe, including:

When the steel pipe needs to be cooled online, the cooling spray ring group of the online cooling device and the above-mentioned inner wall cooling system can set the flow rate, pressure and spray ring configuration according to the cooling process of the steel pipe, and the cooling spray ring of the online cooling device can be set. Groups start early.

When the tail of the steel pipe reaches the water spray device 1, the falling edge of the corresponding hot metal detector is triggered, and the automatic control device controls the lifting mechanism 11 to drive the spray head 13 to move up and down, so that the spray head 13 reaches a preset height, specifically , so that the nozzle 13 is concentric with the steel pipe, and the nozzle 13 is controlled to open to spray cooling water into the steel pipe to cool the inner wall of the steel pipe. When the tail of the steel pipe reaches the next adjacent cooling spray ring, the nozzle 13 is controlled to close;

When the automatic control device tracks the tail of the steel pipe to the air blowing device 2, it controls the air blowing device 2 to open and blow compressed air into the steel pipe to increase the flow rate of the cooling water on the inner wall of the steel pipe, thereby improving the cooling efficiency of the inner wall of the steel pipe. When the tail of the steel pipe reaches the next adjacent cooling spray ring, the air blowing device 2 is controlled to be closed.

That is to say, the inner wall cooling system needs to detect the signal and the tracking signal according to the position of the steel pipe. When the tail of the steel pipe reaches the water spraying device 1 and the air blowing device 2, the water spraying device 1 and the air blowing device 2 are turned on. When the cooling spray rings of the cooling spray ring group where the device 1 and the air blowing device 2 are located are adjacent to the cooling spray ring, the water spray device 1 and the air blowing device 2 are turned off.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. an inner wall cooling system of a hot-rolled seamless steel pipe on-line cooling process, for being installed in a hot-rolled seamless steel pipe on-line cooling device, characterized in that it comprises an automatic control device, a plurality of water spray devices and at least one air blower device; The water spray device is used to be arranged at the inlet of the cooling spray ring group of the online cooling device, between two adjacent groups of cooling spray ring groups or at the outlet of the cooling spray ring group; at least one of the air blowing devices is used for Correspondingly arranged at the top of the end face of the outlet end of at least one group of the cooling spray ring groups behind the water spray device; The air blowing device includes a main body, and the main body is provided with a connected air inlet and a plurality of first nozzles, and the plurality of first nozzles include a first nozzle group and a second nozzle group, the first nozzles The center line of each nozzle in the group and the center line of each nozzle in the second nozzle group respectively have a first included angle and a second included angle with the horizontal plane, and the first included angle is greater than the second included angle angle, the air inlet communicates with the compressed air source; The water spraying device includes a lifting mechanism and a pipe body arranged on the lifting mechanism. One end of the pipe body is communicated with the branching water collection pipe through a valve group and a water pipe, and the other end is provided with a spray head, and the spray head has a plurality of nozzles. second nozzles, a plurality of the second nozzles are respectively arranged at an angle with the pipe body, and the angles are different from each other; The automatic control device is respectively electrically connected with the compressed air source, the spray head and the lifting mechanism. 2. The inner wall cooling system according to claim 1, wherein, Limit switches electrically connected to the automatic control device are respectively provided on the lifting mechanism at both ends of its stroke; The lifting mechanism is also provided with a displacement sensor electrically connected with the automatic control device. 3. The inner wall cooling system according to claim 1, wherein, The spray head is an axial flow spray head. 4. The inner wall cooling system according to claim 1, wherein, The angle ranges of the first included angle and the second included angle are both 30° to 75°. 5. The inner wall cooling system according to claim 1, wherein, The plurality of second nozzles are respectively arranged at an angle with the pipe body, and the angle ranges from 0° to 30°. 6. The inner wall cooling system according to claim 1, wherein, The pressure range of the compressed air source is 0.4～1.0Mpa; The spray pressure of the spray head ranges from 0.2 to 0.8 Mpa. 7. A cooling method for an inner wall cooling system of a hot-rolled seamless steel pipe online cooling process, characterized in that, comprising: When the tail of the steel pipe reaches the water spray device, the falling edge of the corresponding hot metal detector is triggered, and the automatic control device controls the lifting mechanism to drive the spray head to move up and down, so that the spray head reaches a preset height, and controls the spray head to open spraying cooling water into the steel pipe to cool the inner wall of the steel pipe; When the automatic control device tracks the tail of the steel pipe to the air blowing device, it controls the air blowing device to open to blow compressed air into the steel pipe, so as to increase the flow speed of the cooling water on the inner wall of the steel pipe, Thereby, the cooling efficiency of the inner wall of the steel pipe is improved.

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