Steel pipe straightness detection system and detection method in online cooling process of seamless steel pipe

Abstract

The present invention discloses a steel pipe straightness detection system and detection method in an online cooling process of a seamless steel pipe, which relates to the technical field of steel pipe production and manufacturing, and the main purpose is to avoid the inability to uniformly cool the steel pipe in the online cooling process of the steel pipe with unqualified straightness, which will cause the pipe shape to be aggravated, damage the online control cooling system, and cause the system to be stuck and stop production, thus affecting the production stability. The main technical scheme of the present invention is as follows: the system includes a first detection device, which is located on the upper part of the conveyor roller, and includes a first detection module, a first position adjustment mechanism, and a first swing piece rotatably connected to the first position adjustment mechanism; a second detection device, which is located on the side of the conveyor roller, includes a second detection module, a second position adjustment mechanism, and two second swing pieces rotatably connected to the second position adjustment mechanism and opposite to each other; a third detection device, which is located on the lower part of the conveyor roller, includes a third detection module, a third position adjustment mechanism, and a third swing piece rotatably connected to the third position adjustment mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe production and manufacturing, and in particular to a steel pipe straightness detection system and a steel pipe straightness detection method in an online cooling process of a seamless steel pipe. Background Art

[0002] In the production process of hot-rolled seamless steel pipes using controlled cooling, the steel pipes after being rolled by the pipe rolling mill and the sizing mill will be directly cooled rapidly through the online cooling device, so that the steel pipes can be quickly cooled from the high temperature state. The online cooling device is composed of several independent circular spray rings arranged in parallel, and each independent spray ring has inclined high-pressure nozzles evenly distributed along the circumference.

[0003] However, in the production process of hot-rolled seamless steel pipes, it is inevitable that the pipe heads will be warped and damaged, and the pipe bodies will be bent. That is, the straightness of the steel pipe cannot be guaranteed before controlled cooling. If the pipe heads in production are severely warped or damaged, they cannot enter the online cooling device, causing certain damage to the cooling spray ring. At the same time, if the straightness of the steel pipe is unqualified, the steel pipe and the cooling spray ring cannot be guaranteed to be concentric, and the cooling effect on the circumferential direction of the steel pipe is different, which will lead to uneven cooling, further increase the warping of the steel pipe, and make it stuck in the device and unable to move forward. Production needs to be stopped to solve the problem, which consumes manpower, material and financial resources, affects production stability, and causes factory losses. Summary of the invention

[0004] In view of this, the embodiment of the present invention provides a steel pipe straightness detection system and detection method in the online cooling process of seamless steel pipes. The main purpose is to prevent the steel pipes with unqualified straightness from failing to achieve uniform cooling during the online cooling process, thereby causing the pipe shape to be aggravated, causing damage to the online control cooling system, and causing jamming and stopping production, affecting production stability.

[0005] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides an online detection system for the straightness of a hot-rolled seamless steel pipe, which is used to be installed at a conveyor roller of a hot-rolling production line and is at a preset distance from a feeding turning device, comprising:

[0007] A first detection device, the first detection device is located on the upper part of the conveying roller, and the first detection device includes a first detection module, a first position adjustment mechanism, and a first swing piece rotatably connected to the first position adjustment mechanism;

[0008] A second detection device, the second detection device is located at a side of the conveyor roller, the second detection device comprises a second detection module, a second position adjustment mechanism and two second swing pieces which are respectively rotatably connected to the second position adjustment mechanism and are opposite to each other;

[0009] A third detection device, the third detection device is located at the lower part of the conveyor roller, and the third detection device includes a third detection module, a third position adjustment mechanism and a third swing piece rotatably connected to the third position adjustment mechanism;

[0010] Among them, the first detection device, the second detection device and the third detection device are used to be arranged in sequence along the rolling direction of the conveyor roller, the first position adjustment mechanism, the second position adjustment mechanism and the third position adjustment mechanism are used to adjust the distance between the first pendulum piece, the second pendulum piece and the third pendulum piece and the steel pipe respectively, and the first detection module, the second detection module and the third detection module are used to detect the swing angles of the first pendulum piece, the second pendulum piece and the third pendulum piece respectively.

[0011] Furthermore, the end faces of the first swing piece, the second swing piece and the third swing piece opposite to the steel pipe are respectively arc-shaped surfaces that match the contour shape of the steel pipe.

[0012] Further, the first position adjustment mechanism includes a first hydraulic drive unit and a first displacement sensor, the first hydraulic drive unit has a first output end, and the first output end is rotatably connected to a first rotating shaft;

[0013] The first swing piece is connected to the first rotating shaft.

[0014] Furthermore, the first detection module is a first encoder, and the first encoder is connected to the shaft end of the first rotating shaft.

[0015] Furthermore, the second position adjustment mechanism includes a second hydraulic drive unit and a second displacement sensor, the second hydraulic drive unit has two second output ends, and the two second output ends are respectively connected to a second rotating shaft;

[0016] The two second swing pieces are rotatably connected to the second rotating shaft respectively.

[0017] Furthermore, the second detection module is two second encoders, and the two second encoders are respectively connected to shaft ends of two second rotating shafts.

[0018] Further, the third position adjustment mechanism includes a third hydraulic drive unit and a third displacement sensor, the third hydraulic drive unit has a third output end, and the third output end is rotatably connected to a third rotating shaft;

[0019] The third swing piece is connected to the third rotating shaft.

[0020] Furthermore, the third detection module is a third encoder, and the third encoder is connected to the shaft end of the third rotating shaft.

[0021] In a second aspect, an embodiment of the present invention provides an online detection method for the straightness of a hot-rolled seamless steel pipe, which is used in the above-mentioned online detection system for the straightness of a hot-rolled seamless steel pipe, and the method comprises:

[0022] According to the diameter and straightness requirements of the steel pipe, the preset distances between the first pendulum piece, the second pendulum piece and the third pendulum piece and the steel pipe are adjusted in sequence by the first position adjustment mechanism, the second position adjustment mechanism and the third position adjustment mechanism to within the allowable range of the straightness error;

[0023] The sizing steel pipe is passed through the first swing piece, the second swing piece and the third swing piece in sequence on the conveying roller at a preset speed, and the first detection module, the second detection module and the third detection module respectively detect the rotation angle values ​​of the first swing piece, the second swing piece and the third swing piece in sequence;

[0024] When the rotation angle values ​​of the first pendulum piece, the second pendulum piece and the third pendulum piece are all less than the preset value, it means that the straightness of the steel pipe meets the requirements of online cooling, and the online controlled cooling process can be carried out;

[0025] When one or more of the rotation angle values ​​of the first swing piece, the second swing piece and the third swing piece is greater than the preset value, it means that the straightness of the steel pipe does not meet the requirements of online cooling and needs to be transported to the cooling bed through the conveyor roller;

[0026] Among them, the outer diameter D of the steel pipe is 200-460mm, and when the outer diameter of the steel pipe is 200mm≤D<325mm, the preset distance is 15mm, and the preset value is 8°; when the outer diameter of the steel pipe is 325mm<D≤460mm, the preset distance is 20mm, and the preset value is 15°.

[0027] By means of the above technical solution, the present invention has at least the following beneficial effects:

[0028] In the technical solution provided by the embodiment of the present invention, the hot-rolled seamless steel pipe after sizing can pass through the first detection device, the second detection device and the third detection device in sequence on the conveyor roller before the online controlled cooling process is carried out, and the online straightness detection of the entire length of the steel pipe is carried out. When the first detection module, the second detection module and the third detection module detect that the rotation angles of the first pendulum piece, the second pendulum piece and the third pendulum piece are all less than the preset value, it means that the straightness of the steel pipe can meet the requirements of online cooling and the online cooling process can be carried out. When one or more of the rotation angles of the first pendulum piece, the second pendulum piece and the third pendulum piece are greater than the preset value, it means that the straightness of the steel pipe fails to meet the requirements of online cooling and needs to be discarded instead of carrying out the online cooling process, thereby avoiding the inability to achieve uniform cooling during the online cooling process of the steel pipe with unqualified straightness, thereby causing the poor pipe shape to be aggravated, causing damage to the online controlled cooling system, and causing jamming and stopping of production, thereby ensuring production stability, saving manpower, material and financial resources, and avoiding factory losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a steel pipe straightness detection system in an online cooling process of a hot seamless steel pipe provided by an embodiment of the present invention;

[0030] Figure 2 A side view of a steel pipe straightness detection system in an online cooling process for a seamless steel pipe provided by an embodiment of the present invention;

[0031] Figure 3 A schematic structural diagram of a hot rolling production line provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be described in more detail 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 cannot be understood as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail in conjunction with the drawings. 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" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present embodiment.

[0033] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a steel pipe straightness detection system in an online cooling process of a seamless steel pipe, which is used to be installed at a conveyor roller of a hot rolling production line and is at a preset distance from a feeding turning device. Specifically, the preset distance can be 1-2 meters. The detection system includes a first detection device 1, which is located on the upper part of the conveyor roller, and the first detection device 1 includes a first detection module 11, a first position adjustment mechanism 12 and a first swing piece 13 rotatably connected to the first position adjustment mechanism 12; a second detection device 2, which is located on the side of the conveyor roller, and the second detection device 2 includes a second detection module 21, a second position adjustment mechanism 22 and two second swing pieces 2 that are rotatably connected to the second position adjustment mechanism 22 and are opposite to each other. 3; The third detection device 3 is located at the lower part of the conveyor roller, and the third detection device 3 includes a third detection module 31, a third position adjustment mechanism 32 and a third pendulum 33 rotatably connected to the third position adjustment mechanism 32; wherein the first detection device 1, the second detection device 2 and the third detection device 3 are arranged in sequence along the rolling direction of the conveyor roller, the first position adjustment mechanism 12, the second position adjustment mechanism 22 and the third position adjustment mechanism 32 are respectively used to adjust the distance between the first pendulum 13, the second pendulum 23 and the third pendulum 33 and the steel pipe, and the first detection module 11, the second detection module 21 and the third detection module 31 are respectively used to detect the swing angles of the first pendulum 13, the second pendulum 23 and the third pendulum 33. wherein the first position adjustment mechanism 12, the second position adjustment mechanism 22 and the first position adjustment mechanism 12, and the first detection module 11, the second detection module 21 and the third detection module 31 can be electrically connected to the PLC control system and the human-computer interaction interface respectively, so as to be automatically controlled by the PLC control system. wherein, Figure 1 The middle mark "100" indicates hot-rolled seamless steel pipe, and the mark "200" indicates conveyor roller.

[0034] When the seamless steel pipe straightness detection system is used in the online cooling process, it is installed at the conveyor roller of the hot rolling production line, and is 1-2 meters away from the loading and turning device, and the conveyor roller runs through the online straightness detection system, and the loading and turning device and the unloading and turning device of the hot rolling production line are parallel to the conveyor roller, so that the online straightness detection of the hot-rolled seamless steel pipe can be performed. Moreover, the online straightness detection system can be applied to the online detection and determination of the straightness of steel pipes with an outer diameter of 200-460mm before the controlled cooling process.

[0035] In the steel pipe straightness detection system in the online cooling process of seamless steel pipe provided by the embodiment of the present invention, the hot-rolled seamless steel pipe after sizing can pass through the first detection device 1, the second detection device 2 and the third detection device 3 in sequence on the conveyor roller before the online controlled cooling process is carried out, and the online straightness detection of the entire length of the steel pipe is carried out. When the first detection module 11, the second detection module 21 and the third detection module 31 detect that the rotation angles of the first pendulum 13, the second pendulum 23 and the third pendulum 33 are all less than the preset value, it means that the straightness of the steel pipe can meet the requirements of online cooling and the online cooling process can be carried out. When one or more of the rotation angles of the first pendulum 23 and the third pendulum 33 are greater than the preset value, it means that the straightness of the steel pipe fails to meet the requirements of online cooling and needs to be discarded instead of carrying out the online cooling process, thereby avoiding the online cooling process of steel pipes with unqualified straightness causing the poor pipe shape to be aggravated, causing damage to the online controlled cooling system, and causing jamming and stopping production, thereby ensuring production stability, saving manpower, material and financial resources, and avoiding factory losses. Moreover, it has the characteristics of low cost, high precision, wide application range and strong practicality.

[0036] In some examples, the end faces of the first swing piece 13, the second swing piece 23 and the third swing piece 33 that are opposite to the steel pipe can be arc-shaped faces that match the contour of the steel pipe, so that each swing piece can easily contact the steel pipe, thereby further improving the detection accuracy of the detection system.

[0037] For some examples, see Figure 1 The first position adjustment mechanism 12 may include a first hydraulic driving unit 121 and a first displacement sensor. The first hydraulic driving unit 121 has a first output end, and the first output end is rotatably connected to a first rotating shaft 122 ; and the first pendulum 13 is connected to the first rotating shaft 122 .

[0038] In the above embodiment, the position of the first pendulum 13 in the first detection device 1 can be adjusted steplessly in the up and down direction by the first hydraulic drive unit 121, and the position of the first pendulum 13 is detected by the first displacement sensor. Before detecting the straightness of the steel pipe, the position of the first pendulum 13 can be adjusted up and down by controlling the first hydraulic drive unit 121. When the first displacement sensor detects the position of the first pendulum 13 so that the distance between it and the steel pipe is within the allowable range of the straightness error, the straightness of the steel pipe can be detected online, which has a simple structure and is reliable to use. Specifically, the first hydraulic drive unit 121 can be two hydraulic cylinders, and its two piston rods can be rotatably connected to the two ends of the first rotating shaft 122 respectively.

[0039] For some examples, see Figure 1The first detection module 11 may be a first encoder connected to the shaft end of the first rotating shaft 122 , and is used to detect the rotation angle of the first swing piece 13 through the first rotating shaft 122 .

[0040] For some examples, see Figure 1 The second position adjustment mechanism 22 may include a second hydraulic drive unit 221 and a second displacement sensor. The second hydraulic drive unit 221 has two second output ends, and the two second output ends are respectively connected to the second rotating shaft 222; and the two second pendulum pieces 23 are respectively rotatably connected to the two first rotating shafts 122.

[0041] In the above embodiment, the positions of the two second pendulum pieces 23 in the second detection device 2 can be adjusted steplessly in the left and right directions respectively by the second hydraulic drive unit 221, and the positions of the second pendulum pieces 23 are detected by the second displacement sensor. Before detecting the straightness of the steel pipe, the positions of the two second pendulum pieces 23 can be adjusted left and right by controlling the second hydraulic drive unit 221. When the second displacement sensor detects the positions of the two second pendulum pieces 23 so that the distance between them and the steel pipe is within the allowable range of the straightness error, the straightness of the steel pipe can be detected online, which has a simple structure and is reliable to use. Specifically, the second hydraulic drive unit 221 can be a hydraulic cylinder, and its piston rod can be connected to the two second rotating shafts 222.

[0042] For some examples, see Figure 1 The second detection module 21 may be two second encoders, which are respectively connected to the ends of the two second rotating shafts 222 and are used to detect the rotation angle of the second swing piece 23 through the second rotating shafts 222 .

[0043] For some examples, see Figure 1 The third position adjustment mechanism 32 may include a third hydraulic drive unit 321 and a third displacement sensor. The third hydraulic drive unit 321 has a third output end, and the third output end is rotatably connected to a third rotating shaft 322; and the third pendulum 33 is connected to the third rotating shaft 322.

[0044] In the above embodiment, the position of the third pendulum 33 in the third detection device 3 can be adjusted steplessly in the up and down direction by the third hydraulic drive unit 321, and the position of the third pendulum 33 is detected by the third displacement sensor. Before detecting the straightness of the steel pipe, the position of the third pendulum 33 can be adjusted up and down by controlling the third hydraulic drive unit 321. When the third displacement sensor detects the position of the third pendulum 33 so that the distance between it and the steel pipe is within the allowable range of the straightness error, the straightness of the steel pipe can be detected online, and the structure is simple and reliable. Specifically, the third hydraulic drive unit 321 can include a hydraulic cylinder and a lever connected to the piston rod of the hydraulic cylinder, the inflection point of the lever is rotatably fixed, and the free end of the lever is rotatably connected to the third rotating shaft 322.

[0045] For some examples, see Figure 1 The third detection module 31 may be a third encoder connected to the shaft end of the third rotating shaft 322 , and is used to detect the rotation angle of the third swing piece 33 through the third rotating shaft 322 .

[0046] like Figure 3 As shown, an embodiment of the present invention further provides a hot rolling production line, including the aforementioned detection system 300, and also including a sizing area 800, a conveying roller 200, a loading and unloading turning device 400, a unloading and unloading turning device 500, a cooling bed 700, an online cooling device 900, and a cooling roller 600.

[0047] It should be noted that, as mentioned above, when the steel pipe straightness detection system in the online cooling process of the seamless steel pipe is used for the first time, it is installed at the conveyor roller 200 of the hot rolling production line, and is 1-2 meters away from the loading and turning device 400, and the conveyor roller 200 passes through the online straightness detection system, and the loading and turning device 400 and the unloading and turning device 00 are parallel to the conveyor roller 200, so that the online straightness detection of the hot-rolled seamless steel pipe can be carried out.

[0048] The hot rolling production line provided by the embodiment of the present invention includes an online detection system for the straightness of a hot-rolled seamless steel pipe. In the detection system, the hot-rolled seamless steel pipe after sizing can pass through a first detection device 1, a second detection device 2 and a third detection device 3 in sequence on a conveyor roller before an online controlled cold process is performed to perform online detection of the straightness of the entire length of the steel pipe. When the first detection module 11, the second detection module 21 and the third detection module 31 detect that the rotation angles of the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 are all less than a preset value, it indicates that the straightness of the steel pipe is When the degree can meet the requirement of online cooling, the online cooling process can be carried out. When one or more of the rotation angles of the first pendulum piece, the second pendulum piece 23 and the third pendulum piece 33 is greater than the preset value, it means that the straightness of the steel pipe fails to meet the requirement of online cooling and needs to be discarded instead of the online cooling process. This avoids the online cooling process of steel pipes with unqualified straightness causing the pipe shape to be aggravated, causing damage to the online control cooling system, and causing jamming and stopping production, thereby ensuring production stability. Moreover, it has the characteristics of low cost, high precision, wide application range, and strong practicality.

[0049] The embodiment of the present invention also provides an online detection method for the straightness of a hot-rolled seamless steel pipe, which is used in the steel pipe straightness detection system in the aforementioned seamless steel pipe online cooling process. The online detection method for the straightness of a hot-rolled seamless steel pipe may include the following steps, which can be referred to Figure 1 , Figure 2 and Figure 3 .

[0050] (1) According to the diameter and straightness requirements of the steel pipe, the preset distances between the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 and the steel pipe are adjusted in sequence by the first position adjustment mechanism 12, the second position adjustment mechanism 22 and the third position adjustment mechanism 32 to within the allowable range of the straightness error.

[0051] (2) The sizing steel pipe is passed through the first swing piece 13, the second swing piece 23 and the third swing piece 33 on the conveyor roller at a preset speed, and the first detection module 11, the second detection module 21 and the third detection module 31 respectively detect the rotation angle values ​​of the first swing piece 13, the second swing piece 23 and the third swing piece 33 in turn to perform online straightness detection of the steel pipe.

[0052] (3) When the rotation angle values ​​of the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 are all less than the preset values, it means that the straightness of the steel pipe meets the requirements of online cooling, and the online controlled cooling process can be carried out, that is, the steel pipe can be transferred to the cooling roller through the feeding turning device for the online cooling process.

[0053] (4) When one or more of the rotation angle values ​​of the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 are greater than the preset value, it means that the straightness of the steel pipe does not meet the requirements of online cooling, and it needs to be transported to the cooling bed through a conveyor roller and air-cooled to room temperature, that is, the steel pipe that does not meet the straightness requirements is removed to avoid it from undergoing the online cooling process.

[0054] Among them, the detection system is used for online detection and judgment of the straightness of steel pipes with an outer diameter D of 200-460mm before the controlled cooling process. For steel pipes with an outer diameter D of 200mm≤D<325mm, the position of each swing piece is adjusted so that the spacing between it and the outer wall of the steel pipe is 15mm, and the swing angle of the swing piece is less than or equal to 8°, which is regarded as the straightness of the steel pipe meeting the requirement for online cooling; for steel pipes with an outer diameter size of 325mm<D≤460mm, the position of the swing piece is adjusted so that the spacing between it and the outer wall of the steel pipe is 20mm, and the swing angle of the swing piece is less than or equal to 15°, which is regarded as the straightness of the steel pipe meeting the requirement for online cooling.

[0055] The present embodiment is specifically described below by taking the online detection of the straightness of hot-rolled seamless steel pipes with outer diameters of 457 mm and 200 mm as examples.

[0056] When the outer diameter of the hot-rolled seamless steel pipe is 457 mm, the online straightness detection method comprises the following steps:

[0057] (1) According to the diameter and straightness requirements of the steel pipe, the distances between the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 and the steel pipe are adjusted to 20 mm respectively through the first position adjustment mechanism 12, the second position adjustment mechanism 22 and the third position adjustment mechanism 32.

[0058] (2) The sizing steel pipe is passed through the first swing piece 13, the second swing piece 23 and the third swing piece 33 on the conveyor roller at a preset speed, and the first detection module 11, the second detection module 21 and the third detection module 31 respectively detect the rotation angle values ​​of the first swing piece 13, the second swing piece 23 and the third swing piece 33 in turn to perform online straightness detection of the steel pipe.

[0059] (3) When the rotation angle values ​​of the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 are all less than 15 degrees, it means that the straightness of the steel pipe meets the requirements of online cooling, and the steel pipe can be transferred to the cooling roller through the loading and turning device for online cooling process.

[0060] (4) When one or more of the rotation angle values ​​of the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 is greater than 15 degrees, it means that the straightness of the steel pipe does not meet the requirements of online cooling and needs to be transported to the cooling bed through a conveyor roller and air-cooled to room temperature.

[0061] When the outer diameter of the hot-rolled seamless steel pipe is 200 mm, the straightness online detection method comprises the following steps:

[0062] (1) According to the diameter and straightness requirements of the steel pipe, the distances between the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 and the steel pipe are adjusted to 15 mm respectively through the first position adjustment mechanism 12, the second position adjustment mechanism 22 and the third position adjustment mechanism 32.

[0063] (2) The sizing steel pipe is passed through the first swing piece 13, the second swing piece 23 and the third swing piece 33 on the conveyor roller at a preset speed, and the first detection module 11, the second detection module 21 and the third detection module 31 respectively detect the rotation angle values ​​of the first swing piece 13, the second swing piece 23 and the third swing piece 33 in turn to perform online straightness detection of the steel pipe.

[0064] (3) When the rotation angle values ​​of the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 are all less than 8 degrees, it means that the straightness of the steel pipe meets the requirements of online cooling, and the steel pipe can be transferred to the cooling roller through the loading and turning device for online cooling process.

[0065] (4) When one or more of the rotation angle values ​​of the first pendulum piece 13, the second pendulum piece 23 and the third pendulum piece 33 is greater than 8 degrees, it means that the straightness of the steel pipe does not meet the requirements of online cooling and needs to be transported to the cooling bed through a conveyor roller and air-cooled to room temperature.

[0066] The hot-rolled seamless steel pipe straightness online detection method is used for hot-rolled seamless steel pipes that need to be tested for straightness, and the detection is completed through the conveying roller. At the same time, the original rolling line can make the roller in front of the straightness detection system continue to produce and convey steel pipes, ensuring the continuity and efficiency of the online straightness detection method.

[0067] 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. The steel pipe straightness detection system in the online cooling process of seamless steel pipe is used to be installed on the conveyor roller of the hot rolling production line and is at a preset distance from the feeding turning device, characterized in that: include: A first detection device, the first detection device is located on the upper part of the conveying roller, and the first detection device includes a first detection module, a first position adjustment mechanism, and a first swing piece rotatably connected to the first position adjustment mechanism; A second detection device, the second detection device is located at a side of the conveyor roller, the second detection device comprises a second detection module, a second position adjustment mechanism and two second swing pieces which are respectively rotatably connected to the second position adjustment mechanism and are opposite to each other; A third detection device, the third detection device is located at the lower part of the conveyor roller, and the third detection device includes a third detection module, a third position adjustment mechanism and a third swing piece rotatably connected to the third position adjustment mechanism; Among them, the first detection device, the second detection device and the third detection device are used to be arranged in sequence along the rolling direction of the conveyor roller, the first position adjustment mechanism, the second position adjustment mechanism and the third position adjustment mechanism are used to adjust the distance between the first pendulum piece, the second pendulum piece and the third pendulum piece and the steel pipe respectively, and the first detection module, the second detection module and the third detection module are used to detect the swing angles of the first pendulum piece, the second pendulum piece and the third pendulum piece respectively.

2. The detection system according to claim 1, characterized in that: The end faces of the first swing piece, the second swing piece and the third swing piece opposite to the steel pipe are respectively arc-shaped surfaces that match the contour shape of the steel pipe.

3. The detection system according to claim 1, characterized in that: The first position adjustment mechanism includes a first hydraulic drive unit and a first displacement sensor, the first hydraulic drive unit has a first output end, and the first output end is rotatably connected to a first rotating shaft; The first swing piece is connected to the first rotating shaft.

4. The detection system according to claim 3, characterized in that: The first detection module is a first encoder, and the first encoder is connected to the shaft end of the first rotating shaft.

5. The detection system according to claim 1, characterized in that: The second position adjustment mechanism includes a second hydraulic drive unit and a second displacement sensor, the second hydraulic drive unit has two second output ends, and the two second output ends are respectively connected to a second rotating shaft; The two second swing pieces are rotatably connected to the second rotating shaft respectively.

6. The detection system according to claim 5, characterized in that: The second detection module is two second encoders, and the two second encoders are respectively connected to the shaft ends of the two second rotating shafts.

7. The detection system according to claim 1, characterized in that: The third position adjustment mechanism includes a third hydraulic drive unit and a third displacement sensor, wherein the third hydraulic drive unit has a third output end, and the third output end is rotatably connected to a third rotating shaft; The third pendulum is connected to the third rotating shaft.

8. The detection system according to claim 7, characterized in that: The third detection module is a third encoder, and the third encoder is connected to the shaft end of the third rotating shaft.

9. An online detection method for the straightness of a hot-rolled seamless steel pipe, used in a steel pipe straightness detection system in an online cooling process of a seamless steel pipe as claimed in any one of claims 1 to 8, characterized in that: The method comprises: According to the diameter and straightness requirements of the steel pipe, the preset distances between the first pendulum piece, the second pendulum piece and the third pendulum piece and the steel pipe are adjusted in sequence by the first position adjustment mechanism, the second position adjustment mechanism and the third position adjustment mechanism to within the allowable range of the straightness error; The sizing steel pipe is passed through the first swing piece, the second swing piece and the third swing piece in sequence on the conveying roller at a preset speed, and the first detection module, the second detection module and the third detection module respectively detect the rotation angle values ​​of the first swing piece, the second swing piece and the third swing piece in sequence; When the rotation angle values ​​of the first pendulum piece, the second pendulum piece and the third pendulum piece are all less than the preset value, it means that the straightness of the steel pipe meets the requirements of online cooling, and the online controlled cooling process can be carried out; When one or more of the rotation angle values ​​of the first swing piece, the second swing piece and the third swing piece is greater than the preset value, it means that the straightness of the steel pipe does not meet the requirements of online cooling and needs to be transported to the cooling bed through the conveyor roller; Among them, the outer diameter D of the steel pipe is 200-460mm, and when the outer diameter of the steel pipe is 200mm≤D<325mm, the preset distance is 15mm, and the preset value is 8°; when the outer diameter of the steel pipe is 325mm<D≤460mm, the preset distance is 20mm, and the preset value is 15°.

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