On-line automatic measuring device for wall thickness of high-temperature steel pipe

Abstract

The invention discloses an on-line automatic measuring device for the wall thickness of a high-temperature steel pipe. The device comprises a steel pipe guide column, a transmission ring, a main rack assembly, a connecting rod assembly and a first adjusting assembly. A steel pipe guide column is arranged in the main machine frame assembly and used for conveying a to-be-tested steel pipe. The transmission ring is coaxially arranged outside the steel pipe guide column and is close to a steel pipe outlet of the steel pipe guide column, the transmission ring is connected with an outlet side plate of the main machine frame assembly through a first adjusting assembly, and a plurality of connecting rod assemblies arranged at intervals along the circumference are installed at the position, close to a steel pipe inlet, of the steel pipe guide column. A detection assembly is installed at the position, stretching into the steel pipe guide column, of each connecting rod assembly, and the connecting rod assemblies are further connected with an inlet side plate of the main rack assembly and the transmission ring. The device provided by the invention can measure the wall thickness of the steel pipe on line for a long time at a high temperature (600-1000 DEG C), real-time synchronization of related data is realized, the qualified rate of finished steel pipes is greatly improved, and the cost of a production line is reduced.

Description

Technical Field

[0001] The present invention relates to a steel pipe wall thickness detection device, and particularly to an on-line automatic measurement device for the wall thickness of a steel pipe in a high-temperature state. Background Art

[0002] The on-line automatic detection of the wall thickness of a steel pipe in a high-temperature state is a project with great difficulty and high requirements. During the production process of hot-rolled steel pipes, due to the high-temperature environment, it is difficult to conduct measurements in the high-temperature environment on-site. Generally, it is only after the steel pipe is cooled that the wall thickness can be tested by measuring instruments. In this way, it is difficult to provide real-time feedback of key data during the production process. However, the annual output of steel pipes is huge, and the production almost operates 24 hours without interruption. If it is found that the wall thickness does not meet the requirements after the steel pipe is cooled, the defective products will be in batches, resulting in great waste. Therefore, it is necessary to propose an on-line automatic measurement device for the wall thickness of high-temperature steel pipes. Summary of the Invention

[0003] In order to solve the problems and requirements in the background art, the present invention proposes an on-line automatic measurement device for the wall thickness of high-temperature steel pipes, which can automatically adjust the detection distance according to the outer diameter of the steel pipe. At the same time, a follow-up mechanism is designed to enable the probe detection component to follow the surface fluctuation of the steel pipe, which not only protects the probe component but also ensures the necessary detection distance. In addition, multiple cooling protections such as water cooling and air cooling are provided for the core detection components to achieve long-term on-line measurement at high temperatures (600 - 1100 °C).

[0004] The technical solution adopted by the present invention is as follows:

[0005] An on-line automatic measurement device for the wall thickness of a high-temperature steel pipe includes a steel pipe guiding column, a transmission ring, a main frame assembly, a connecting rod assembly, and a first adjustment assembly; a steel pipe guiding column is arranged inside the main frame assembly, and the steel pipe guiding column is used for conveying the steel pipe to be measured; the transmission ring is arranged outside the steel pipe guiding column and is coaxially arranged with the steel pipe guiding column. The transmission ring is arranged near the steel pipe outlet of the steel pipe guiding column and can slide axially on the steel pipe guiding column. The transmission ring is connected to the outlet side plate of the main frame assembly through the first adjustment assembly. A plurality of connecting rod assemblies arranged at intervals along the circumference are installed near the steel pipe inlet of the steel pipe guiding column. A detection component is installed at the position where each connecting rod assembly extends into the steel pipe guiding column. The connecting rod assembly is also connected to the inlet side plate of the main frame assembly and to the transmission ring; the first adjustment assembly adjusts the axial movement of the transmission ring, and the transmission ring drives each connecting rod assembly to generate a radial movement until the structure where each connecting rod assembly extends into the steel pipe guiding column is disengaged from the pipe wall of the steel pipe to be measured, so as to adapt to different steel pipe diameters.

[0006] The main frame assembly further includes a frame, a top plate, a right side plate, and a left side plate. Inside the frame, there are steel pipe guide columns, a transmission ring, a connecting rod assembly, and a first adjustment assembly. The top plate is installed on the top of the frame, the left side plate is installed on the left side of the frame, the right side plate is installed on the right side of the frame. An inlet side plate is installed on the steel pipe inlet side of the frame, and an outlet side plate is installed on the steel pipe outlet side of the frame.

[0007] The connecting rod assembly includes a first connecting rod, a first connecting shaft, a second connecting rod, a second connecting shaft, a connecting piece, a buffer spring, a buffer connecting frame, a guide bushing, a guide shaft, and a fourth connecting rod. The guide bushing is installed in the steel pipe guide column and the axis of the guide bushing is located on the radial direction of the steel pipe. The guide shaft is installed in the guide bushing and the guide shaft is coaxially arranged with the guide bushing. One end of the guide shaft extends into the steel pipe guide column and is connected to the corresponding detection component. The other end of the guide shaft is hinged to one end of the fourth connecting rod. The other end of the fourth connecting rod is hinged to one end of the second connecting rod. The other end of the second connecting rod is connected to the inlet side plate of the main frame assembly through the first connecting rod. The other end of the fourth connecting rod is also connected to the connecting piece. A guide rod is provided on the side of the connecting piece close to the steel pipe inlet. A buffer connecting frame is installed at the end of the guide rod and a buffer spring is sleeved outside the guide rod. The buffer connecting frame slides along the guide rod. The buffer connecting frame is connected to the transmission ring.

[0008] The detection component includes a probe holder, rollers, mounting blocks, and probes. The probe holder is connected to the connecting rod assembly. Probes are installed in the probe holder. Corresponding rollers are installed on both sides of the probe holder through the corresponding mounting blocks. The rollers are in contact with the pipe wall of the steel pipe to be measured.

[0009] The first adjustment assembly includes a driving cylinder. The driving cylinder is fixedly connected to the outlet side plate of the main frame assembly. The piston rod of the driving cylinder is connected to the transmission ring.

[0010] A plurality of linear guide rails arranged at intervals along the circumference are installed on the outer circumferential side of the steel pipe guide column. Each linear guide rail is arranged along the axial direction of the steel pipe. A corresponding rail support is slidably installed in each linear guide rail. A plurality of raised blocks arranged at intervals along the circumference are provided on the side of the transmission ring close to the steel pipe inlet. Each rail support is fixedly connected to the corresponding raised block on the side of the transmission ring.

[0011] An upper limit plate is installed on the inner side surface of the transmission ring. A lower limit plate is installed on the outer circumferential side surface of the steel pipe guide column. The upper limit plate and the lower limit plate are paired to limit the transmission ring.

[0012] The on-line automatic measuring device further includes a second adjustment assembly. Each second adjustment assembly is used to adjust the axial position of the corresponding lower limit plate on the steel pipe guide column.

[0013] The second adjustment component includes a first bearing support, a lead screw assembly, a second bearing support, and an adjustment motor; the adjustment motor is fixedly installed on the outer circumferential side of the steel pipe guide column, the lead screw assembly is fixedly installed on the outer circumferential side of the steel pipe guide column through the first bearing support and the second bearing support, the output shaft of the adjustment motor is connected to the lead screw assembly, the lower limit plate is connected to the slider in the lead screw assembly, and the adjustment motor adjusts the axial position of the lower limit plate on the steel pipe guide column through the lead screw assembly.

[0014] A heat insulation bracket is also attached inside the steel pipe guide column.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention adopts a unique connecting rod assembly, which can convert the flat push movement into a vertical movement, not only reducing the driving components, but also making the action stable and reliable;

[0017] The present invention designs a buffer structure; during on-line testing, the connecting rod assembly can float along with the surface of the steel pipe, avoiding hard contact of the detection components and improving their service life;

[0018] The present invention designs two adjustment components, which can automatically adjust the detection distance of the detection components according to the outer diameter of the steel pipe;

[0019] The present invention adopts dual protection of air cooling and water cooling, so that the detection components always maintain an appropriate working temperature, improving the detection accuracy and service life;

[0020] The present invention adopts a split design, which is convenient for disassembly and installation, improving its maintainability;

[0021] The device proposed by the present invention has perfect functions and high automation. After startup, it does not require manual intervention, reducing the workload of on-site personnel;

[0022] The device proposed by the present invention can measure the wall thickness of steel pipes online for a long time at high temperatures (600 - 1000 °C), realize real-time synchronization of relevant data, greatly improve the finished product qualification rate of steel pipes, and reduce the cost of the production line. Description of the Drawings

[0023] Figure 1 It is an axonometric view of an on-line automatic measuring device for the wall thickness of high-temperature steel pipes when detecting the wall thickness of the steel pipe passing through.

[0024] Figure 2 It is an axonometric view of the main frame assembly of an on-line automatic measuring device for the wall thickness of high-temperature steel pipes, where (a) is the axonometric view of the main frame assembly Figure 1 , (b) is the axonometric view of the main frame assembly Figure 2 .

[0025] Figure 3Is an isometric view of the upper connecting rod assembly of an on-line automatic measuring device for the wall thickness of high-temperature steel pipes.

[0026] Figure 4 Is an isometric view of the detection component on an on-line automatic measuring device for the wall thickness of high-temperature steel pipes, where (a) is the isometric view of the detection component Figure 1 , (b) is the isometric view of the detection component Figure 2 .

[0027] Figure 5 Is an isometric view of the steel pipe guide column and drive ring on an on-line automatic measuring device for the wall thickness of high-temperature steel pipes, where (a) is the isometric view of the steel pipe guide column and drive ring Figure 1 , (b) is the isometric view of the steel pipe guide column and drive ring Figure 2 , (c) is the isometric view of the steel pipe guide column and drive ring Figure 3 .

[0028] Figure 6 Is an isometric view of the adjustment component on an on-line automatic measuring device for the wall thickness of high-temperature steel pipes.

[0029] In the figure: main frame assembly 1, connecting rod assembly 2, drive assembly 3, second adjustment assembly 4, steel pipe to be measured 5, frame 6, top plate 7, right side plate 8, inlet side plate 9, left side plate 10, outlet side plate 11, first connecting rod 12, first connecting shaft 13, second connecting rod 14, second connecting shaft 15, connecting piece 16, buffer spring 17, buffer connecting frame 18, floating joint 19, fixing nut 20, detection component 21, guide bushing 22, guide shaft 23, third connecting shaft 24, fourth connecting rod 25, probe holder 26, roller 27, mounting block 28, roller shaft 29, probe 30, drive cylinder 31, upper limit plate 32, guide rail bracket 33, heat insulation bracket 34, linear guide rail 37, drive ring 38, auxiliary support 39, first bearing support 40, lead screw assembly 41, lower limit plate 42, second bearing support 43, adjustment motor 44, first mounting hole 101, second mounting hole 102, third mounting hole 103, fourth mounting hole 201, fifth mounting hole 202, sixth mounting hole 203, seventh mounting hole 301, eighth mounting hole 302, ninth mounting hole 303. Detailed implementation manners

[0030] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the purpose of describing the present invention 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. Therefore, it should not be construed as a limitation to the present invention.

[0032] As Figure 1 shown, an on-line automatic measuring device for the wall thickness of high-temperature steel pipes proposed by the present invention includes a steel pipe guiding column, a transmission ring 38, a main frame assembly 1, a connecting rod assembly 2 and a first adjustment assembly; a steel pipe guiding column is arranged inside the main frame assembly 1, and the steel pipe guiding column is used for conveying the steel pipe 5 to be measured; a heat insulation bracket 34 is also attached inside the steel pipe guiding column, and materials such as heat insulation cotton are filled inside the heat insulation bracket 34 to enhance the heat insulation function. The transmission ring 38 is arranged outside the steel pipe guiding column and is coaxially arranged with the steel pipe guiding column. The transmission ring 38 is arranged near the steel pipe outlet of the steel pipe guiding column. The transmission ring 38 can slide axially on the steel pipe guiding column. The transmission ring 38 is connected to the outlet side plate 11 of the main frame assembly 1 through the first adjustment assembly. A plurality of connecting rod assemblies 2 arranged at equal intervals along the circumference are installed near the steel pipe inlet of the steel pipe guiding column. A detection assembly 21 is installed at the place where each connecting rod assembly 2 extends into the steel pipe guiding column. The connecting rod assembly 2 is also fixedly connected to the inlet side plate 9 of the main frame assembly 1 and fixedly connected to the transmission ring 38; the first adjustment assembly controls the axial movement of the transmission ring 38, and the transmission ring 38 drives each connecting rod assembly 2 to generate a radial movement until the structure of each connecting rod assembly 2 extending into the steel pipe guiding column is disengaged from the pipe wall of the steel pipe 5 to be measured, so as to adapt to different steel pipe diameters.

[0033] As Figure 2 of (a) and Figure 2 of (b) shown, the main frame assembly 1 further includes a frame 6, a top plate 7, a right side plate 8 and a left side plate 10. The frame 6 houses a steel pipe guiding column, a transmission ring 38, a connecting rod assembly 2 and a first adjustment assembly. The top plate 7 is installed on the top of the frame 6. The left side plate 10 is installed on the left side of the frame 6. The right side plate 8 is installed on the right side of the frame 6. The inlet side plate 9 is installed on the steel pipe inlet side of the frame 6. The outlet side plate 11 is installed on the steel pipe outlet side of the frame 6. A relatively closed space is formed inside the frame 6. The top plate 7 is provided with a first installation hole 101 and a second installation hole 102. Cooling air enters through the first installation hole 101 and the second installation hole 102, and cooling air comes out through the third installation hole 103 to cool and protect the entire box body.

[0034] As Figure 3As shown, the connecting rod assembly 2 includes a first connecting rod 12, a first connecting shaft 13, a second connecting rod 14, a second connecting shaft 15, a connecting member 16, a buffer spring 17, a buffer connecting frame 18, a floating joint 19, a fixing nut 20, a guide bushing 22, a guide shaft 23, a third connecting shaft 24 and a fourth connecting rod 25; the guide bushing 22 is installed in the steel pipe guide column and the axis of the guide bushing 22 is located in the radial direction of the steel pipe, the guide shaft 23 is installed in the guide bushing 22 and the guide shaft 23 is coaxially arranged with the guide bushing 22, one end of the guide shaft 23 extends into the steel pipe guide column and is connected to the probe holder 26 of the corresponding detection assembly 21, the other end of the guide shaft 23 is hinged to one end of the fourth connecting rod 25 through the third connecting shaft 24, the other end of the fourth connecting rod 25 is hinged to one end of the second connecting rod 14 through the second connecting shaft 15, the other end of the second connecting rod 14 is connected to the inlet side plate 9 of the main frame assembly 1 through the first connecting rod 12, and a fixed connection is provided between the first connecting rod 12 and the inlet side plate 9. The other end of the fourth connecting rod 25 is also connected to the connecting member 16, wherein the other end of the fourth connecting rod 25, one end of the second connecting rod 14 and the connecting member 16 are all connected through the second connecting shaft 15. A guide rod is provided on one side of the connecting member 16 close to the steel pipe inlet, a buffer connecting frame 18 is installed at the end of the guide rod and a buffer spring 17 is sleeved outside the guide rod. The buffer connecting frame 18 slides along the guide rod, causing the buffer spring 17 to deform. The end of the guide rod limits the buffer connecting frame 18 through the fixing nut 20; a plurality of auxiliary supports 39 arranged at intervals along the circumference are fixedly installed on one side of the transmission ring 38 close to the steel pipe inlet, and the buffer connecting frame 18 is connected to the corresponding auxiliary support 39 on the transmission ring 38 through the floating joint 19, as Figure 5 shown in (b) of. There are a fourth mounting hole 201 and a sixth mounting hole 203 on the guide shaft 23, and the fourth mounting hole 201 and the sixth mounting hole 203 respectively correspond to the inlet and outlet for passing cooling circulating water, and the fifth mounting hole 202 is connected to compressed cooling air.

[0035] As Figure 4 shown in (a) of and Figure 4As shown in (b), the detection assembly 21 includes a probe holder 26, rollers 27, mounting blocks 28, roller shafts 29, and probes 30. The probe holder 26 is fixedly connected to the end of the guide shaft 23 of the link assembly 2 that extends into the steel pipe guide column. The probe 30 is installed in the probe holder 26. Corresponding rollers 27 are installed on both sides of the probe holder 26 through the corresponding mounting blocks 28 and roller shafts 29 respectively. The rollers 27 are in contact with the pipe wall of the steel pipe 5 to be measured. At this time, there is a spaced arrangement between the probe 30 and the pipe wall of the steel pipe 5 to be measured. The probe holder 26 is provided with a seventh mounting hole 301, an eighth mounting hole 302, and a ninth mounting hole 303. The eighth mounting hole 302 and the ninth mounting hole 303 are connected to the fourth mounting hole 201 and the sixth mounting hole 203 on the guide shaft 23 through pipelines to realize the connection of the cooling circulating water loop. The seventh mounting hole 301 on the probe 30 is connected to the fifth mounting hole 202 on the guide shaft 23 to realize the connection of the compressed cooling air. In this way, the detection assembly 21 realizes the dual protection of water cooling and air cooling.

[0036] As shown in Figure 5 (a) of FIG., the first adjustment assembly includes a driving cylinder 31. The driving cylinder 31 is fixedly connected to the outlet side plate 11 of the main frame assembly 1. The piston rod of the driving cylinder 31 is connected to the transmission ring 38.

[0037] A plurality of linear guide rails 37 arranged at intervals along the circumference are installed on the outer circumferential side surface of the steel pipe guide column. Each linear guide rail 37 is arranged along the axial direction of the steel pipe. A corresponding guide rail bracket 33 is slidably installed in each linear guide rail 37. The side surface of the transmission ring 38 close to the steel pipe inlet is provided with a plurality of protruding blocks arranged at intervals along the circumference. Each guide rail bracket 33 is fixedly connected to the corresponding protruding block on the side surface of the transmission ring 38. Driven by the driving cylinder 31, the transmission ring 38 slides on the steel pipe guide column until the upper limit plate 32 and the lower limit plate 42 are in contact. The upper limit plate 32 is installed on the inner side surface of the transmission ring 38, and the lower limit plate 42 is installed on the outer circumferential side surface of the steel pipe guide column. The upper limit plate 32 and the lower limit plate 42 are paired to limit the transmission ring 38, that is, when the two are in contact, the transmission ring 38 and the steel pipe guide column are relatively fixed axially.

[0038] As shown in Figure 5 (c) of FIG., the on-line automatic measuring device further includes a second adjustment assembly 4. Each second adjustment assembly 4 is used to adjust the axial position of the lower limit plate 42 on the steel pipe guide column.

[0039] As shown in Figure 6As shown in the figure, the second adjustment component 4 includes a first bearing support 40, a lead screw assembly 41, a second bearing support 43, and an adjustment motor 44. The adjustment motor 44 is fixedly installed on the outer circumferential side surface of the steel pipe guide column. The lead screw assembly 41 is fixedly installed on the outer circumferential side surface of the steel pipe guide column through the first bearing support 40 and the second bearing support 43. The output shaft of the adjustment motor 44 is connected to the lead screw assembly 41. The lower limit plate 42 is connected to the slider in the lead screw assembly 41. The adjustment motor 44 adjusts the axial position of the lower limit plate 42 on the steel pipe guide column through the lead screw assembly 41.

[0040] The working process of an on-line automatic measuring device for the wall thickness of high-temperature steel pipes proposed by the present invention is as follows:

[0041] 1) As Figure 6 shown in the figure, before the work starts, according to the outer diameter of the steel pipe, the adjustment motor 44 on the second adjustment component 4 drives the lead screw assembly 41 to move left and right to make the lower limit plate 42 reach the set position. The three driving cylinders 31 on the driving component 3 are pushed out to drive the transmission ring 38 to move horizontally. When the upper limit plate 32 contacts the lower limit plate 42, it stops. While the transmission ring 38 moves horizontally, it drives 6 groups of connecting rod components 2 to drive the guide shaft 23 to move radially and vertically to make the detection component 21 reach the set position;

[0042] 2) After the steel pipe 5 to be measured enters the main frame component 1, the surface of the steel pipe 5 to be measured contacts the roller 27 on the detection component 21. The highest point of the roller 27 is about 2 mm higher than the probe to prevent the probe 35 from directly contacting the steel pipe 5 to be measured and causing damage. Due to reasons such as the uneven surface of the steel pipe 5 to be measured and the wear of the conveying roller path, the actual contact line of the steel pipe 5 to be measured is a wavy line that floats up and down. The guide shaft 23 on the connecting rod component 2 also floats up and down through the buffer spring 17, which not only protects the detection component but also keeps the detection distance of the probe stable, making the detection result more accurate;

[0043] 3) As Figure 3 and Figure 4 shown in the figure, the circulating cooling water enters from the fourth installation hole 201 of the guide shaft 23 on the connecting rod component 2, passes through the eighth installation hole 302 on the probe 30 of the detection component 21, and passes through the ninth installation hole 303, and then comes out from the sixth installation hole 203 of the guide shaft 23 on the connecting rod component 2 to complete the protection of the circulating cooling water for the detection component 21;

[0044] 4) As Figure 3 and Figure 4 shown in the figure, the compressed cooling air enters from the fifth installation hole 202 of the guide shaft 23 on the connecting rod component 2 and enters the seventh installation hole 301 on the probe 30 of the detection component 21 to complete the protection of the compressed cooling air for the detection component 21.

[0045] 5) As Figure 2 in (a) ofFigure 2 As shown in (b), the cooling air with a large displacement enters from the first mounting hole 101 and the second mounting hole 102 on the top plate 7 of the main frame assembly 1, and then exits from the third mounting hole 103 on the left side plate 10 of the main frame assembly 1, forming a circulating cooling, which completes the cooling protection of the main frame assembly 1 and the connecting rod assembly 2, the driving assembly 3, and the second adjustment assembly 4 inside it, enabling the whole machine to work in a high-temperature environment for a long time.

[0046] 6) After the detection is completed, the three driving cylinders 31 on the driving assembly 3 retract, and the adjustment motor 44 on the second adjustment assembly 4 drives the lead screw assembly 41 to move left and right to make the lower limit plate 42 return to the original position, completing a cycle.

[0047] Finally, it should be noted that the above embodiments and descriptions are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the disclosure of the technical solutions of the present invention, they should all be covered by the protection scope of the claims of the present invention.

Claims

1. An online automatic measuring device for high temperature steel pipe wall thickness, characterized in that: The invention comprises a steel pipe guide column, a transmission ring (38), a main frame assembly (1), a connecting rod assembly (2) and a first adjustment assembly; the main frame assembly (1) is provided with a steel pipe guide column, and the steel pipe guide column is used to convey the steel pipe (5) to be tested; the transmission ring (38) is arranged outside the steel pipe guide column and the transmission ring (38) is arranged coaxially with the steel pipe guide column, the transmission ring (38) is arranged close to the steel pipe outlet of the steel pipe guide column, the transmission ring (38) can slide axially on the steel pipe guide column, the transmission ring (38) is connected to the outlet side plate (11) of the main frame assembly (1) through the first adjustment assembly, and the steel pipe guide column is provided with a steel pipe guide column. A plurality of connecting rod assemblies (2) arranged at intervals along the circumference are installed near the steel pipe inlet of the column, and a detection assembly (21) is installed at the position where each connecting rod assembly (2) extends into the steel pipe guide column. The connecting rod assembly (2) is also connected to the inlet side plate (9) of the main frame assembly (1) and to the transmission ring (38); the first adjustment assembly adjusts the transmission ring (38) to move in the axial direction, and the transmission ring (38) drives each connecting rod assembly (2) to move in the radial direction until the structure of each connecting rod assembly (2) extending into the steel pipe guide column is released from the pipe wall of the steel pipe (5) to be tested, thereby adapting to different steel pipe diameters.

2. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 1, characterized in that: The main frame assembly (1) further comprises a frame (6), a top plate (7), a right side plate (8) and a left side plate (10); a steel pipe guide column, a transmission ring (38), a connecting rod assembly (2) and a first adjustment assembly are placed in the frame (6); the top plate (7) is installed on the top of the frame (6); the left side plate (10) is installed on the left side of the frame (6); the right side plate (8) is installed on the right side of the frame (6); an inlet side plate (9) is installed on the steel pipe inlet side of the frame (6); and an outlet side plate (11) is installed on the steel pipe outlet side of the frame (6).

3. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 1, characterized in that: The connecting rod assembly (2) comprises a first connecting rod (12), a first connecting shaft (13), a second connecting rod (14), a second connecting shaft (15), a connecting piece (16), a buffer spring (17), a buffer connecting frame (18), a guide sleeve (22), a guide shaft (23) and a fourth connecting rod (25); the guide sleeve (22) is installed in a steel pipe guide column and the axis of the guide sleeve (22) is located in the radial direction of the steel pipe; the guide shaft (23) is installed in the guide sleeve (22) and the guide shaft (23) is coaxially arranged with the guide sleeve (22); one end of the guide shaft (23) extends into the steel pipe guide column and is connected to the corresponding detection assembly (21). The other end of the guide shaft (23) is hinged to one end of the fourth connecting rod (25), the other end of the fourth connecting rod (25) is hinged to one end of the second connecting rod (14), the other end of the second connecting rod (14) is connected to the inlet side plate (9) of the main frame assembly (1) through the first connecting rod (12), the other end of the fourth connecting rod (25) is also connected to the connecting piece (16), a guide rod is provided at the side of the connecting piece (16) close to the steel pipe inlet, a buffer connecting frame (18) is installed at the end of the guide rod, and a buffer spring (17) is provided on the outer sleeve of the guide rod, and the buffer connecting frame (18) slides along the guide rod; the buffer connecting frame (18) is connected to the transmission ring (38).

4. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 1, characterized in that: The detection assembly (21) comprises a probe frame (26), a roller (27), a mounting block (28) and a probe (30); the probe frame (26) is connected to the connecting rod assembly (2), the probe frame (26) is installed with the probe (30), and corresponding rollers (27) are installed on both sides of the probe frame (26) through corresponding mounting blocks (28), and the rollers (27) are in contact with the pipe wall of the steel pipe (5) to be tested.

5. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 1, characterized in that: The first adjustment assembly comprises a driving cylinder (31), the driving cylinder (31) is fixedly connected to the outlet side plate (11) of the main frame assembly (1), and the piston rod of the driving cylinder (31) is connected to the transmission ring (38).

6. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 1, characterized in that: A plurality of linear guide rails (37) arranged at intervals along the circumference are installed on the outer circumferential side surface of the steel pipe guide column, each linear guide rail (37) is arranged along the axial direction of the steel pipe, a corresponding guide rail bracket (33) is slidably installed in each linear guide rail (37), a plurality of convex blocks arranged at intervals along the circumference are arranged on the side surface of the transmission ring (38) close to the steel pipe entrance, and each guide rail bracket (33) is fixedly connected to a corresponding convex block on the side surface of the transmission ring (38).

7. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 1, characterized in that: An upper limit plate (32) is installed on the inner side of the transmission ring (38), and a lower limit plate (42) is installed on the outer circumferential side of the steel pipe guide column. The upper limit plate (32) and the lower limit plate (42) are matched to limit the transmission ring (38).

8. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 7, characterized in that: The online automatic measuring device also includes a second adjustment assembly (4), each second adjustment assembly (4) being used to adjust the axial position of a corresponding lower limit plate (42) on the steel pipe guide column.

9. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 8, characterized in that: The second adjustment assembly (4) comprises a first bearing support seat (40), a screw assembly (41), a second bearing support seat (43) and an adjustment motor (44); the adjustment motor (44) is fixedly mounted on the outer circumferential side of the steel tube guide column, the screw assembly (41) is fixedly mounted on the outer circumferential side of the steel tube guide column through the first bearing support seat (40) and the second bearing support seat (43), the output shaft of the adjustment motor (44) is connected to the screw assembly (41), the lower limit plate (42) is connected to the slider in the screw assembly (41), and the adjustment motor (44) adjusts the axial position of the lower limit plate (42) on the steel tube guide column through the screw assembly (41).

10. The online automatic measuring device for high temperature steel pipe wall thickness according to claim 1, characterized in that: A heat insulation bracket (34) is also attached to the inside of the steel pipe guide column.

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