Inner wall cooling system and cooling method of online cooling process for hot rolled seamless steel pipe

Abstract

The invention discloses an inner wall cooling system and cooling method of an online cooling process for a hot-rolled seamless steel pipe, and relates to the technical field of hot-rolled seamless steel pipe production, and 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 spray 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, the center line of each nozzle in the first nozzle group of the plurality of first nozzles and the center line of each nozzle in the second nozzle group respectively have a first angle and a second angle with the horizontal plane, the first angle is greater than the second angle, and the air inlet is connected to a compressed air source; the water spray device includes a lifting mechanism and a pipe body arranged thereon, one end of the pipe body is connected to a diversion and water collecting pipe, and the other end is provided with a nozzle, the nozzle has a plurality of second nozzles, and the plurality of second nozzles are respectively arranged at different angles with the pipe body; the automatic control device is electrically connected to the compressed air source, the nozzle and the lifting mechanism respectively.

Description

Technical Field

[0001] 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 of an online cooling process for a hot-rolled seamless steel pipe. Background Art

[0002] Realizing the onlineization of offline heat treatment processes and giving full play to the organizational regulation role of controlled rolling and controlled cooling processes are the key directions for the development of new products and new processes for hot-rolled seamless steel pipes. The currently disclosed online controlled cooling technology for hot-rolled seamless steel pipes mainly uses water spray cooling on the outer wall of the steel pipe during the cooling process. It has a good hardening effect on steel pipes with thin walls or strong hardenability. However, for thick-walled steel pipes and steel pipes with poor hardenability, the cooling intensity of the outer wall of the steel pipe is large, while the cooling intensity of the inner wall is low, resulting in uneven organization of the inner and outer walls, which reduces the cooling uniformity of the thickness direction of the steel pipe. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides an inner wall cooling system and a cooling method for an online cooling process of a hot-rolled seamless steel pipe, the main purpose of which is to improve the cooling intensity of the inner wall of the steel pipe, avoid the poor uniformity of the inner and outer wall structures of the steel pipe due to the large surface supercooling during the online cooling process of the steel pipe, thereby ensuring the cooling uniformity in the thickness direction of the steel pipe.

[0004] To achieve the above objectives, the embodiments of the present invention mainly provide the following technical solutions:

[0005] On the one hand, an embodiment of the present invention provides an inner wall cooling system for an online cooling process of a hot-rolled seamless steel pipe, which is used to be installed in an online cooling device for a hot-rolled seamless steel pipe, and includes an automatic control device, a plurality of water spray devices, and at least one air blowing device;

[0006] 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 cooling spray ring groups or at the outlet of the cooling spray ring group; at least one of the air blowing devices is used to be arranged correspondingly at the top of the outlet end surface of at least one group of the cooling spray ring groups behind the water spray device;

[0007] The air blowing device comprises a main body, the main body is provided with a connected air inlet and a plurality of first nozzles, the plurality of first nozzles comprises a first nozzle group and a second nozzle group, the center line of each nozzle in the first nozzle group and the center line of each nozzle in the second nozzle group respectively have a first angle and a second angle with a horizontal plane, and the first angle is greater than the second angle, and the air inlet is connected to a compressed air source;

[0008] The water spray device comprises a lifting mechanism and a pipe body arranged on the lifting mechanism, one end of the pipe body is connected to the flow dividing and collecting pipe through a valve group and a water distribution 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 at an angle with the pipe body, and the angles are different;

[0009] The automatic control device is electrically connected to the compressed air source, the nozzle and the lifting mechanism respectively.

[0010] Furthermore, the lifting mechanism is provided with limit switches electrically connected to the automatic control device at both ends of its travel;

[0011] The lifting mechanism is also provided with a displacement sensor electrically connected to the automatic control device.

[0012] Furthermore, the nozzle is an axial flow nozzle.

[0013] Furthermore, the first angle and the second angle are both in the range of 30-75°.

[0014] Furthermore, the plurality of second nozzles are respectively arranged at an angle with the tube body, and the angle ranges from 0° to 30°.

[0015] Further, the pressure range of the compressed gas source is 0.4-1.0Mpa;

[0016] The water spraying pressure of the nozzle is in the range of 0.2 to 0.8 MPa.

[0017] On the other hand, an embodiment of the present invention further provides a cooling method for an inner wall cooling system of an online cooling process for a hot-rolled seamless steel pipe, comprising:

[0018] When the tail of the steel pipe reaches the water spraying 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 to spray cooling water into the steel pipe to achieve cooling of the inner wall of the steel pipe;

[0019] When the automatic control device tracks the tail of the steel pipe to the blowing device, it controls the blowing device to open and blows compressed air into the steel pipe to increase the flow rate of cooling water on the inner wall of the steel pipe, thereby improving the cooling efficiency of the inner wall of the steel pipe.

[0020] By means of the above technical solution, the present invention has at least the following beneficial effects:

[0021] The technical solution provided by the embodiment of the present invention includes an automatic control device, multiple water spray devices and at least one air blowing device; and the multiple water spray devices are used to be respectively arranged between two adjacent groups of cooling spray ring groups in the online cooling device; at least one air blowing device is used to be correspondingly arranged at the top of the outlet end face of at least one group of cooling spray ring groups behind the water spray device, so that the automatic control device can control the water spray device to spray high-pressure cooling water onto the inner wall of the steel pipe, thereby realizing the cooling of the inner wall of the steel pipe. At the same time, the automatic control device can also control the air blowing device to blow compressed air onto 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. That is to say, the embodiment of the present invention adopts a water spray device in combination with an air blowing device, which can not only realize the cooling of the inner wall of the steel pipe, but also accelerate the flow rate of the cooling water on the inner wall of the steel pipe, effectively improving the cooling efficiency and cooling uniformity of the inner wall of the steel pipe, and ensuring the cooling uniformity in the thickness direction of the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A schematic structural diagram of a water spray device of an inner wall cooling system of an online cooling process for a hot-rolled seamless steel pipe provided by an embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of an air blowing device of an inner wall cooling system of an online cooling process for a hot-rolled seamless steel pipe provided by an embodiment of the present invention;

[0025] Figure 3 A structural schematic diagram of an inner wall cooling system of an online cooling process for a hot-rolled seamless steel pipe provided in an embodiment of the present invention, which is arranged in an online cooling device. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0027] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the scope of protection of this embodiment.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides an inner wall cooling system for an online cooling process of a hot-rolled seamless steel pipe, which is used to be installed in an online cooling device for a hot-rolled seamless steel pipe, and includes an automatic control device, a plurality of water spray devices 1 and at least one blowing device 2; the water spray device 1 is used to be arranged at the inlet of a cooling spray ring group of the online cooling device, between two adjacent cooling spray ring groups or at the outlet of the cooling spray ring group; at least one blowing device 2 is used to be correspondingly arranged on the top of the outlet end face of at least one cooling spray ring group behind the water spray device 1; wherein the blowing device 2 includes a main body 21, and a connected air inlet 211 and a plurality of first nozzles 212 are provided on the main body 21, and the plurality of first nozzles 212 include a first nozzle group 212a and a second nozzle group 212b, and 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 angle and a second angle with the horizontal plane, and it should be noted here that , the steel pipe moves along the horizontal plane, that is, 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 angle and a second angle with the axis of the steel pipe, and the first angle is greater than the second angle, the air inlet 211 is connected to 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 spraying device 1 includes a lifting mechanism 11 and a pipe body 12 arranged on the lifting mechanism 11, one end of the pipe body 12 is connected to the diversion and water collecting pipe through a valve group and a water distribution pipe, and a nozzle 13 is arranged at the other end, 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 arranged at an angle with the pipe body 12, 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. The lifting mechanism 11 can be driven by a hydraulic system, which can be a hydraulic cylinder. Figure 2 The number "20" in the middle label indicates steel pipe; Figure 3 The middle number "10" represents the cooling spray ring group, and the number "101" represents the cooling spray ring.

[0029] The inner wall cooling system of the online cooling process of the hot-rolled seamless steel pipe provided by the embodiment of the present invention comprises an automatic control device, a plurality of water spray devices 1 and at least one blowing device 2; and the water spray device 1 is used to be arranged at the inlet of the cooling spray ring group of the online cooling device, between two adjacent cooling spray ring groups or at the outlet of the cooling spray ring group; at least one blowing device 2 is used to be arranged correspondingly at the top of the outlet end face of at least one cooling spray ring group behind the water spray device 1, 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, thereby realizing the inner wall cooling of the steel pipe. At the same time, the automatic control device can also control the blowing device 2 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. That is to say, the embodiment of the present invention adopts the water spray device 1 and cooperates with the blowing device 2, which can not only realize the cooling of the inner wall of the steel pipe, but also accelerate 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.

[0030] It should be noted that by arranging the water spray device 1 between two adjacent cooling spray ring groups, and each water spray device 1 is equipped with an independent lifting mechanism 11, each water spray device 1 can be lifted and lowered by its own lifting mechanism 11 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 has a simpler structure. Moreover, the multiple second nozzles 131 of the nozzle 13 in the water spray device 1 are respectively arranged at an angle to the pipe body 12, that is, the center line of the second nozzle 131 has an angle with the axis of the pipe body 12, and the angles of the angles are different. Such a structural 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 improving the uniformity of cooling. At the same time, by arranging the blowing device 2 at the top of the end face of the outlet end of the cooling spray ring group, that is, the top of the side face 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 reached by the tail, and the center line of each nozzle in the first nozzle group 212a of the blowing device 2 and the center line of each nozzle in the second nozzle 131 group 212b are respectively and respectively with the horizontal plane, that is, have a first angle and a second angle with the steel pipe, and the first angle is greater than the second angle, so that when the tail of the steel pipe is reached, the first nozzle group 212a and the second nozzle 131 group 212b can jointly blow compressed air into the inner wall of the steel pipe, and when the tail of the steel pipe leaves, the blowing device 2 can still blow a large amount of compressed air into the inner wall of the steel pipe through the second nozzle 131 group 212b, thereby further increasing the flow rate of cooling water on the inner wall of the steel pipe and improving the cooling efficiency.

[0031] In an alternative embodiment, see Figure 3, there can be six air blowing devices 2 and two water spraying devices 1. The two water spraying devices 1 are respectively installed at the entrance of the first cooling spray ring group and between the fourth and fifth cooling spray ring groups. The air blowing devices 2 are respectively arranged on the top of the outlet end faces of the first, second, third, fifth, sixth and seventh cooling spray ring groups. The automatic control device is used to control the electrical connection between the water spraying device 1 and the air blowing device 2, and is used to control each of them to perform corresponding 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 effectively together, the air blowing device 2 may not be arranged on a group of cooling spray ring groups in front of the water spraying device 1.

[0032] In an optional embodiment, the lifting mechanism 11 is provided with limit switches electrically connected to the automatic control device at both ends of its travel; the lifting mechanism 11 is also provided with a displacement sensor electrically connected to the automatic control device. 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 control the lifting mechanism 11 to drive the nozzle 13 to move up and down according to the diameter of the steel pipe, the limit switch and the signal sent by the displacement sensor, and then control the nozzle 13 to spray cooling water into the inner wall of the steel pipe after the nozzle 13 is coaxial with the steel pipe, thereby further improving the cooling effect and cooling uniformity of the inner wall of the steel pipe.

[0033] The first angle and the second angle may both be in the range of 30 to 75°, specifically, the first angle may be 50°, and the second angle may be 30°. Moreover, the plurality of second nozzles 131 are respectively arranged at an angle with the tube body 12, and the angle range may be 0 to 30°. In addition, the pressure range of the compressed air source may be 0.4 to 1.0 MPa; and the water spray pressure range of the nozzle 13 may be 0.2 to 0.8 MPa.

[0034] The embodiment of the present invention also provides a cooling method for an inner wall cooling system of an online cooling process for a hot-rolled seamless steel pipe, comprising:

[0035] 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, pressure and spray ring configuration according to the cooling process of the steel pipe, and the cooling spray ring group of the online cooling device is opened in advance.

[0036] 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, the spray head 13 is coaxial with the steel pipe, and the spray head 13 is controlled to open to spray cooling water into the steel pipe to achieve cooling of the inner wall of the steel pipe. When the tail of the steel pipe reaches the next adjacent cooling spray ring, the spray head 13 is controlled to close.

[0037] When the automatic control device tracks the tail of the steel pipe to the blowing device 2, the blowing device 2 is controlled to open and blow compressed air into the steel pipe to increase the flow rate of 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 blowing device 2 is controlled to close.

[0038] That is to say, the inner wall cooling system needs to detect the signal and tracking signal based on the steel pipe position. When the tail of the steel pipe reaches the water spray device 1 and the air blowing device 2, the water spray device 1 and the air blowing device 2 are turned on. When the tail of the steel pipe enters the cooling spray ring adjacent to the cooling spray ring group where the water spray device 1 and the air blowing device 2 are located, the water spray device 1 and the air blowing device 2 are turned off.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An inner wall cooling system for an online cooling process of a hot-rolled seamless steel pipe, used to be installed in an online cooling device for a hot-rolled seamless steel pipe, characterized in that: It includes an automatic control device, a plurality of water spraying devices and at least one air blowing 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 cooling spray ring groups or at the outlet of the cooling spray ring group; at least one of the air blowing devices is used to be arranged correspondingly at the top of the outlet end surface of at least one group of the cooling spray ring groups behind the water spray device; The air blowing device comprises a main body, the main body is provided with a connected air inlet and a plurality of first nozzles, the plurality of first nozzles comprises a first nozzle group and a second nozzle group, the center line of each nozzle in the first nozzle group and the center line of each nozzle in the second nozzle group respectively have a first angle and a second angle with a horizontal plane, and the first angle is greater than the second angle, and the air inlet is connected to a compressed air source; The water spray device comprises a lifting mechanism and a pipe body arranged on the lifting mechanism, one end of the pipe body is connected to the flow dividing and collecting pipe through a valve group and a water distribution 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 at an angle with the pipe body, and the angles are different; The automatic control device is electrically connected to the compressed air source, the nozzle and the lifting mechanism respectively.

2. The inner wall cooling system according to claim 1, characterized in that: The lifting mechanism is provided with limit switches electrically connected to the automatic control device at both ends of its travel; The lifting mechanism is also provided with a displacement sensor electrically connected to the automatic control device.

3. The inner wall cooling system according to claim 1, characterized in that: The nozzle is an axial flow nozzle.

4. The inner wall cooling system according to claim 1, characterized in that: The angle range of the first angle and the second angle is 30-75°.

5. The inner wall cooling system according to claim 1, characterized in that: The plurality of second nozzles are respectively arranged at an angle with the tube body, and the angle ranges from 0° to 30°.

6. The inner wall cooling system according to claim 1, characterized in that: The pressure range of the compressed gas source is 0.4~1.0Mpa; The water spraying pressure of the nozzle is in the range of 0.2-0.8 MPa.

7. A cooling method for an inner wall cooling system of an online cooling process for a hot-rolled seamless steel pipe according to any one of claims 1 to 6, characterized in that: include: When the tail of the steel pipe reaches the water spraying 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 to spray cooling water into the steel pipe to achieve cooling of the inner wall of the steel pipe; When the automatic control device tracks the tail of the steel pipe to the blowing device, it controls the blowing device to open and blows compressed air into the steel pipe to increase the flow rate of cooling water on the inner wall of the steel pipe, thereby improving the cooling efficiency of the inner wall of the steel pipe.

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