Method and device for on-line measurement of internal and external diameters of hot-rolled seamless tube

Abstract

The invention relates to the technical field of hot-rolled seamless tube online measurement, in particular to a hot-rolled seamless tube online internal and external diameter measurement device which comprises a seamless tube body and further comprises an external diameter measurement trolley arranged on the outer side of the seamless tube body. The outer diameter measuring trolley drives the measuring roller to measure the outer diameter, the inner diameter measuring trolley drives the inner measuring head to measure the inner diameter, accurate measurement of the inner diameter and the outer diameter of the seamless pipe body can be achieved, centering clamps are arranged below the positioning trolley and the axial trolley, lifting clamps are arranged between the centering clamps and the positioning trolley, and therefore clamping of the seamless pipe body can be achieved; different sizes or measurement requirements can be met through a lifting function, the centering stability of the seamless pipe body in the measurement process is guaranteed, an inner diameter measurement supporting cylinder is arranged at the bottom of the inner diameter measurement trolley, four inner measurement heads are arranged in a circumferential symmetrical distributed sliding mode, the inner diameter of the seamless pipe body can be comprehensively and evenly measured, and the measurement accuracy is improved. And the accuracy and integrity of inner diameter measurement are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of online measurement of hot-rolled seamless pipes, in particular to a method and device for online measurement of inner and outer diameters of hot-rolled seamless pipes. Background Art

[0002] Before the oblique rolling piercing machine produces seamless pipes, the positions of the left and right rollers and their distances to the rolling center must be accurately adjusted. At the same time, the positions of the upper and lower guide plates and their distances to the rolling center also need to be appropriately adjusted. Only when these positions are properly adjusted can qualified seamless pipes be ensured to be rolled. By detecting the inner and outer diameters during the production process of hot-rolled seamless pipes, the hole accuracy of the rolling mill can be further adjusted. However, we have found in actual life that in the current production process, static measurement mainly relies on manual use of calipers. However, this measurement method has the problem that during the measurement process, the working environment temperature is high, which makes the measurement accuracy difficult to guarantee. At the same time, it also takes up the production cycle time, causing the temperature to drop. The temperature fluctuation will have an adverse effect on the execution of subsequent processes, thereby affecting product quality and process completion, and may even bring risks to production safety. For this reason, we propose a method and device for online measurement of inner and outer diameters of hot-rolled seamless pipes. Summary of the Invention

[0003] A technical problem to be solved by the present application is to perform online indirect measurement of inner and outer diameters during rapid transportation of hot-rolled seamless pipes, thereby improving production efficiency and ensuring product quality and dimensional accuracy.

[0004] In order to solve the above technical problems, the embodiment of the present application provides a device for online measuring the inner and outer diameters of hot-rolled seamless pipes, comprising a seamless pipe body, characterized in that: it also includes

[0005] An outer diameter measuring trolley is arranged outside the seamless pipe body, and a measuring roller is arranged below the outer diameter measuring trolley, and the measuring roller is in an upper and lower "V" shape. The seamless pipe body is centered and clamped by the upper and lower V-shaped measuring rollers. The outer diameter measuring trolley drives the measuring roller to move outside the seamless pipe body to measure the outer diameter of the seamless pipe body;

[0006] An inner diameter measuring trolley is provided at one end of the seamless pipe body. An inner measuring head is provided on a side of the inner diameter measuring trolley close to the seamless pipe body. The inner diameter measuring trolley is used to drive the inner measuring head to move linearly within the seamless pipe body, thereby driving the inner measuring head to measure the inner diameter of the seamless pipe body within a certain axial length range.

[0007] A positioning trolley is provided at one end of the seamless pipe body. An axial trolley is provided at the end of the seamless pipe body away from the positioning trolley. The positioning trolley cooperates with the axial trolley to clamp the seamless pipe body and drive it to keep it horizontal and centered.

[0008] In some embodiments, a centering clamp for clamping the seamless pipe body is provided under the positioning trolley and the axial trolley, and a lifting clamp is provided between the two centering clamps and the positioning trolley and the axial trolley.

[0009] In some embodiments, the tops of the positioning trolley, the axial trolley, and the outer diameter measuring trolley are all provided with a centering and correction clamping group, and the two centering clamps and the measuring roller move synchronously through the centering and correction clamping group.

[0010] In some embodiments, a trolley track is provided above the positioning trolley, axial trolley and outer diameter measuring trolley, and trolley wheels are rotatably provided on both sides of the positioning trolley, axial trolley and outer diameter measuring trolley, and the six trolley wheels are used in conjunction with the trolley track, and a trolley travel gear driving device is provided on both sides of the positioning trolley, axial trolley and outer diameter measuring trolley, and the positioning trolley, axial trolley and outer diameter measuring trolley respectively drive the six trolley wheels to rotate through the corresponding trolley travel gear driving devices, driving the six trolley wheels to move parallel and laterally on the trolley track.

[0011] In some embodiments, an inner diameter measuring support cylinder is provided at the bottom of the inner diameter measuring trolley, four lever-balanced cylinder piston rods are provided at one end of the inner diameter measuring support cylinder, four inner measuring heads are provided, and they correspond one-to-one to the four lever-balanced cylinder piston rods, and the four inner measuring heads are symmetrically distributed and slidably provided at the end of the inner diameter measuring support cylinder away from the inner diameter measuring trolley.

[0012] In some embodiments, four measuring levers are provided in the inner diameter measuring support cylinder, and the four measuring levers correspond one-to-one to the four inner measuring heads. Lever fulcrums are provided between the four measuring levers and the inner diameter measuring support cylinder, and the ends of the four measuring levers away from the four inner measuring heads are respectively provided at the corresponding lever balancing cylinder piston rod output ends.

[0013] In some embodiments, a hydraulic buffer cylinder is provided between the inner diameter measuring support cylinder and the inner diameter measuring trolley, a trolley fulcrum is provided between the inner diameter measuring support cylinder and the inner diameter measuring trolley, and the inner diameter measuring support cylinder is rotatably connected to the inner diameter measuring trolley through the trolley fulcrum.

[0014] In some embodiments, a lever balancing cylinder A chamber and a lever balancing cylinder B chamber are respectively opened in the piston rod of the lever balancing cylinder.

[0015] The method for online measuring inner and outer diameters of the hot-rolled seamless pipe disclosed in the present invention is as follows:

[0016] S1: Start the trolley travel gear drive device to drive the positioning trolley, axial trolley and outer diameter measuring trolley into position;

[0017] S2: Start the lifting clamping, drive the centering clamp and measuring roller to descend, and clamp the seamless pipe body;

[0018] S3: Start the lifting clamp to drive the centering clamp and measuring roller to rise, and drive the seamless pipe body, the centering clamp and the inner diameter measuring support cylinder to the same axis;

[0019] S4: Collect and record the outer diameter data of the seamless pipe body using axial coordinate discrete points;

[0020] S5: Start the piston rod of the lever balancing cylinder to drive the gas into the B chamber of the lever balancing cylinder;

[0021] S6: Start the inner diameter measuring trolley and drive the inner diameter measuring trolley to drive the inner diameter measuring support cylinder into the seamless pipe body;

[0022] S7: Start the piston rod of the lever balancing cylinder to drive the gas into the A chamber of the lever balancing cylinder;

[0023] S8: Start the inner diameter measuring trolley to drive the inner diameter measuring support cylinder to slowly separate from the seamless pipe body;

[0024] S9: Collect and record the inner diameter data of the seamless pipe body using axial coordinate discrete points;

[0025] S10: Start the axial movement of the trolley and adjust the position of the axial trolley through machine vision and CCD camera photography results;

[0026] S11: Record the length data of the seamless pipe body.

[0027] The present invention has at least the following beneficial effects:

[0028] The outer diameter measuring trolley drives the measuring roller to measure the outer diameter, and the inner diameter measuring trolley drives the inner measuring head to measure the inner diameter, so as to realize the accurate measurement of the inner and outer diameters of the seamless pipe body and meet the requirements of dimensional accuracy in production. The measuring roller is in a "V" shape, which helps to better fit and contact with the outer side of the seamless pipe body, thereby improving the accuracy and stability of the outer diameter measurement. A centering clamp is set under the positioning trolley and the axial trolley, and a lifting clamp is set between them, which can not only clamp the seamless pipe body, but also adapt to different sizes or measurement requirements through the lifting function, thereby ensuring the centering stability of the seamless pipe body during the measurement process. An inner diameter measuring support cylinder is set at the bottom of the inner diameter measuring trolley, and the four inner measuring heads are arranged in a circularly symmetrical distributed sliding manner, which can comprehensively and evenly measure the inner diameter of the seamless pipe body and ensure the accuracy and completeness of the inner diameter measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the measuring roller structure of the present invention;

[0031] Figure 3 For the present invention Figure 1 Schematic diagram of the structure from above;

[0032] Figure 4 It is a side sectional schematic diagram of the inner diameter measuring support cylinder structure of the present invention.

[0033] In the figure: 1. Centering correction clamping group; 2. Axial trolley; 3. Trolley wheel; 4. Lifting clamp; 5. Centering clamp; 6. Seamless pipe body; 7. Trolley track; 8. Outside diameter measuring trolley; 9. Positioning trolley; 10. Internal measuring head; 11. Measuring lever; 12. Lever fulcrum; 13. Inside diameter measuring trolley; 14. Lever balancing cylinder B chamber; 15. Lever balancing cylinder piston rod; 16. Lever balancing cylinder A chamber; 17. Trolley fulcrum; 18. Hydraulic buffer cylinder; 19. Inside diameter measuring support cylinder; 20. Trolley travel gear drive device; 21. Measuring roller. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-4The present invention provides a technical solution: a device for online measuring the inner and outer diameters of a hot-rolled seamless pipe, comprising a seamless pipe body 6, characterized in that: it also includes

[0037] An outer diameter measuring trolley 8 is provided outside the seamless pipe body 6. A measuring roller 21 is provided below the outer diameter measuring trolley 8. The measuring roller 21 is in a vertical "V" shape. The seamless pipe body 6 is centered and clamped by the vertical V-shaped measuring roller 21. The outer diameter measuring trolley 8 drives the measuring roller 21 to move outside the seamless pipe body 6 to measure the outer diameter of the seamless pipe body 6.

[0038] An inner diameter measuring trolley 13 is provided at one end of the seamless pipe body 6. An inner measuring head 10 is provided on a side of the inner diameter measuring trolley close to the seamless pipe body 6. The inner diameter measuring trolley 13 is used to drive the inner measuring head 10 to move linearly within the seamless pipe body 6, thereby driving the inner measuring head 10 to measure the inner diameter of the seamless pipe body 6 within a certain axial length range.

[0039] A positioning trolley 9 is provided at one end of the seamless pipe body 6. An axial trolley 2 is provided at the end of the seamless pipe body 6 away from the positioning trolley 9. The positioning trolley 9 is used in conjunction with the axial trolley 2 to clamp the seamless pipe body 6 and drive it to remain horizontal and centered. The purpose of setting the measuring roller 21 to be V-shaped is to improve the measurement accuracy, avoid the seamless pipe body 6 from being offset due to gravity or vibration, ensure the data is accurate, and thus improve the stability and reliability of the overall measurement system.

[0040] Centering clamps 5 for clamping the seamless pipe body 6 are provided below the positioning trolley 9 and the axial trolley 2 , and lifting clamps 4 are provided between the two centering clamps 5 and the positioning trolley 9 and the axial trolley 2 .

[0041] A centering and correction clamping group 1 is provided on the top of the positioning trolley 9 , the axial trolley 2 and the outer diameter measuring trolley 8 , and the two centering clamps 5 and the measuring roller 21 move synchronously through the centering and correction clamping group 1 .

[0042] A trolley track 7 is arranged above the positioning trolley 9, the axial trolley 2 and the outer diameter measuring trolley 8. Trolley wheels 3 are rotatably arranged on both sides of the positioning trolley 9, the axial trolley 2 and the outer diameter measuring trolley 8, and the six trolley wheels 3 are used in conjunction with the trolley track 7. Trolley travel gear driving devices 20 are arranged on both sides of the positioning trolley 9, the axial trolley 2 and the outer diameter measuring trolley 8, and the positioning trolley 9, the axial trolley 2 and the outer diameter measuring trolley 8 respectively drive the six trolley wheels 3 to rotate through the corresponding trolley travel gear driving devices 20, driving the six trolley wheels 3 to move parallel and laterally on the trolley track 7.

[0043] An inner diameter measuring support cylinder 19 is provided at the bottom of the inner diameter measuring trolley 13. Four lever-balanced cylinder piston rods 15 are provided at one end of the inner diameter measuring support cylinder 19. Four inner measuring heads 10 are provided, and they correspond one-to-one to the four lever-balanced cylinder piston rods 15. The four inner measuring heads 10 are symmetrically distributed and slidingly arranged at the end of the inner diameter measuring support cylinder 19 away from the inner diameter measuring trolley 13.

[0044] Four measuring levers 11 are arranged in the inner diameter measuring support cylinder 19, and the four measuring levers 11 correspond one-to-one to the four inner measuring heads 10. A lever fulcrum 12 is arranged between the four measuring levers 11 and the inner diameter measuring support cylinder 19. The ends of the four measuring levers 11 away from the four inner measuring heads 10 are respectively arranged at the output ends of the corresponding lever balancing cylinder piston rods 15.

[0045] A hydraulic buffer cylinder 18 is provided between the inner diameter measuring support cylinder 19 and the inner diameter measuring trolley 13 , a trolley fulcrum 17 is provided between the inner diameter measuring support cylinder 19 and the inner diameter measuring trolley 13 , and the inner diameter measuring support cylinder 19 is rotatably connected to the inner diameter measuring trolley 13 through the trolley fulcrum 17 .

[0046] A lever balancing cylinder A chamber 16 and a lever balancing cylinder B chamber 14 are respectively defined in the lever balancing cylinder piston rod 15 .

[0047] During use, when the seamless pipe body 6 reaches the position to be measured, the lifting clamp 4 is started, and the centering clamp 5 and the measuring roller 21 below it are driven down by the lifting clamp 4, and the seamless pipe body 6 is clamped to ensure that the seamless pipe body 6 can rise steadily. Then, the lifting clamp 4 is used to control the seamless pipe body 6 to slowly rise to the measuring height, and then the centering correction clamp group 1 is started, and the measuring roller 21 and the centering clamp 5 are synchronously adjusted to ensure that the seamless pipe body 6 is accurately centered. When the centering correction clamp group 1 adjusts the seamless pipe body 6, and When the measuring roller 21 is clamped on the outer diameter of the seamless pipe body 6, the two sets of centering clamps 5 and the measuring roller 21 are respectively provided with clamp opening displacement sensors. By controlling the measuring roller 21 to move outside the seamless pipe body 6, the outer diameter of the seamless pipe body 6 is measured. Then the staff can collect the outer diameter data of the seamless pipe body 6. The purpose of setting the measuring roller 21 in a V shape is to improve the measurement accuracy, avoid the seamless pipe body 6 from being offset due to gravity or vibration, ensure the data is accurate, and thus improve the stability and reliability of the overall measurement system;

[0048] While measuring the outer diameter, start the inner diameter measuring trolley 13, and drive the inner diameter measuring support cylinder 19 and the inner measuring head 10 into the seamless pipe body 6 through the inner diameter measuring trolley 13. Before the inner diameter measuring support cylinder 19 enters the seamless pipe body 6, it is necessary to pre-adjust the pressure in the four lever balancing cylinder B chambers 14 so that air is admitted into the lever balancing cylinder B chamber 14. At this time, the inner measuring head 10 is away from the inner wall of the seamless pipe body 6 to ensure that the inner diameter measuring support cylinder 19 enters the seamless pipe body 6 smoothly and quickly, thereby reducing the time required for the measurement process and keeping the temperature of the seamless pipe body 6 as stable as possible to avoid affecting the subsequent process due to temperature changes. When the inner diameter measuring support cylinder 19 completely enters the seamless pipe body 6, gradually adjust the pressure in the lever balancing cylinder A chamber 16 so that the gas enters the lever balancing cylinder A chamber 16. At this time, the gas pressure in the lever balancing cylinder A chamber 16 gradually increases, causing the lever balancing cylinder piston rod 15 to push The measuring lever 11, with the corresponding lever fulcrum 12 as the axis, drives the inner measuring head 10 to gradually approach the inner wall of the seamless pipe body 6, and then controls the inner diameter measuring support cylinder 19 to move slowly through the inner diameter measuring trolley 13 to ensure that the inner measuring head 10 evenly contacts the inner wall of the seamless pipe and accurately collects the inner diameter data. The inner diameter measuring support cylinder 19 is connected to the trolley fulcrum 17 and the hydraulic buffer cylinder 18, so that the inner diameter measuring support cylinder 19 will produce "displacement and retreat" during entering the seamless pipe body 6, avoiding "over-constraint" on the seamless pipe body 6 during the measurement process, causing damage to the inner diameter measuring trolley 13 and other devices, ensuring the accuracy of the inner diameter measurement data and the long-term stability of the equipment. The four inner measuring heads 10 correspond to the four-way connection points of the inner diameter measuring support cylinder 19 respectively. Its advantage is that it can fully cover the inner wall of the seamless pipe body 6, reduce the measurement blind area, improve data accuracy, and at the same time reduce the error caused by single-point contact, ensuring the comprehensiveness and reliability of the measurement results;

[0049] After completing the inner diameter measurement of the seamless pipe body 6, the staff can record the measurement results through intelligent computer data collection, and then drive the trolley wheels 3 on the axial trolley 2 to move smoothly along the trolley track 7 through the trolley travel gear drive device 20, and then adjust the position of the axial trolley 2 according to the machine vision and the photo results of the CCD camera. When the trolley moves at a constant speed along the pipeline, it triggers the shooting of image sequences at fixed time intervals, and at the same time indirectly measures the length of the seamless pipe body 6 to ensure the accuracy of the length data of the seamless pipe body 6.

[0050] A method for online measurement of inner and outer diameters of hot-rolled seamless pipes:

[0051] S1: Start the trolley travel gear drive device to drive the positioning trolley, axial trolley and outer diameter measuring trolley into position;

[0052] S2: Start the lifting clamping, drive the centering clamp and measuring roller to descend, and clamp the seamless pipe body;

[0053] S3: Start the lifting clamp to drive the centering clamp and measuring roller to rise, and drive the seamless pipe body, the centering clamp and the inner diameter measuring support cylinder to the same axis;

[0054] S4: Collect and record the outer diameter data of the seamless pipe body using axial coordinate discrete points;

[0055] S5: Start the piston rod of the lever balancing cylinder to drive the gas into the B chamber of the lever balancing cylinder;

[0056] S6: Start the inner diameter measuring trolley and drive the inner diameter measuring trolley to drive the inner diameter measuring support cylinder into the seamless pipe body;

[0057] S7: Start the piston rod of the lever balancing cylinder to drive the gas into the A chamber of the lever balancing cylinder;

[0058] S8: Start the inner diameter measuring trolley to drive the inner diameter measuring support cylinder to slowly separate from the seamless pipe body;

[0059] S9: Collect and record the inner diameter data of the seamless pipe body using axial coordinate discrete points;

[0060] S10: Start the axial movement of the trolley and adjust the position of the axial trolley through machine vision and CCD camera photography results;

[0061] S11: Record the length data of the seamless pipe body.

[0062] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for online measuring the inner and outer diameters of a hot-rolled seamless pipe, comprising a seamless pipe body (6), characterized in that: Also includes An outer diameter measuring trolley (8) is arranged outside the seamless pipe body (6), a measuring roller (21) is arranged below the outer diameter measuring trolley (8), and the measuring roller (21) is in an upper and lower "V" shape. The measuring roller (21) in the upper and lower V shape is used to center and clamp the seamless pipe body (6), and the outer diameter measuring trolley (8) drives the measuring roller (21) to move outside the seamless pipe body (6), so as to drive the measuring roller (21) to measure the outer diameter of the seamless pipe body (6); An inner diameter measuring trolley (13) is arranged at one end of the seamless pipe body (6), and an inner measuring head (10) is arranged on a side of the inner diameter measuring trolley close to the seamless pipe body (6). The inner diameter measuring trolley (13) is used to drive the inner measuring head (10) to move linearly in the seamless pipe body (6), so as to drive the inner measuring head (10) to measure the inner diameter of the seamless pipe body (6) within a certain axial length range; A positioning trolley (9) is provided at one end of the seamless pipe body (6), and an axial trolley (2) is provided at the end of the seamless pipe body (6) away from the positioning trolley (9). The positioning trolley (9) cooperates with the axial trolley (2) to clamp the seamless pipe body (6) and drive it to keep it horizontal and centered.

2. The device for online measuring inner and outer diameters of hot-rolled seamless pipes according to claim 1, characterized in that: A centering clamp (5) for clamping the seamless pipe body (6) is provided below the positioning trolley (9) and the axial trolley (2), and a lifting clamp (4) is provided between the two centering clamps (5) and the positioning trolley (9) and the axial trolley (2).

3. The device for online measuring inner and outer diameters of hot-rolled seamless pipes according to claim 1, characterized in that: The tops of the positioning trolley (9), the axial trolley (2) and the outer diameter measuring trolley (8) are all provided with a centering and correction clamping group (1), and the two centering clamps (5) and the measuring roller (21) move synchronously through the centering and correction clamping group (1).

4. The device for online measuring inner and outer diameters of hot-rolled seamless pipes according to claim 1, characterized in that: A trolley track (7) is provided above the positioning trolley (9), the axial trolley (2) and the outer diameter measuring trolley (8); trolley wheels (3) are rotatably provided on both sides of the positioning trolley (9), the axial trolley (2) and the outer diameter measuring trolley (8); and the six trolley wheels (3) are used in conjunction with the trolley track (7); trolley travel gear driving devices (20) are provided on both sides of the positioning trolley (9), the axial trolley (2) and the outer diameter measuring trolley (8); and the positioning trolley (9), the axial trolley (2) and the outer diameter measuring trolley (8) respectively drive the six trolley wheels (3) to rotate through the corresponding trolley travel gear driving devices (20), thereby driving the six trolley wheels (3) to move parallel and laterally on the trolley track (7).

5. The device for online measuring inner and outer diameters of hot-rolled seamless pipes according to claim 1, characterized in that: An inner diameter measuring support cylinder (19) is provided at the bottom of the inner diameter measuring trolley (13), and four lever-balanced cylinder piston rods (15) are provided at one end of the inner diameter measuring support cylinder (19). Four inner measuring heads (10) are provided, and correspond one to one with the four lever-balanced cylinder piston rods (15). The four inner measuring heads (10) are symmetrically distributed and slidingly provided at one end of the inner diameter measuring support cylinder (19) away from the inner diameter measuring trolley (13).

6. The device for online measuring inner and outer diameters of hot-rolled seamless pipes according to claim 1, characterized in that: Four measuring levers (11) are arranged in the inner diameter measuring support cylinder (19), and the four measuring levers (11) correspond to the four inner measuring heads (10) one by one. A lever fulcrum (12) is arranged between the four measuring levers (11) and the inner diameter measuring support cylinder (19), and one end of the four measuring levers (11) away from the four inner measuring heads (10) is respectively arranged at the output end of the corresponding lever balancing cylinder piston rod (15).

7. The device for online measuring inner and outer diameters of hot-rolled seamless pipes according to claim 6, characterized in that: A hydraulic buffer cylinder (18) is provided between the inner diameter measuring support cylinder (19) and the inner diameter measuring trolley (13), a trolley fulcrum (17) is provided between the inner diameter measuring support cylinder (19) and the inner diameter measuring trolley (13), and the inner diameter measuring support cylinder (19) is rotatably connected to the inner diameter measuring trolley (13) via the trolley fulcrum (17).

8. The device for online measuring inner and outer diameters of hot-rolled seamless pipes according to claim 6, characterized in that: A lever balancing cylinder A cavity (16) and a lever balancing cylinder B cavity (14) are respectively provided in the lever balancing cylinder piston rod (15).

9. A method for online measuring inner and outer diameters of a hot-rolled seamless pipe according to any one of claims 1 to 8, characterized in that: S1: Start the trolley travel gear drive device to drive the positioning trolley, axial trolley and outer diameter measuring trolley into position; S2: Start the lifting clamping, drive the centering clamp and measuring roller to descend, and clamp and center the seamless pipe body; S3: Start the lifting clamp to drive the centering clamp and measuring roller to rise, and drive the seamless pipe body, the centering clamp and the inner diameter measuring support cylinder to the same axis; S4: Collect and record the outer diameter data of the seamless pipe body using axial coordinate discrete points; S5: Start the piston rod of the lever balancing cylinder to drive the gas into the B chamber of the lever balancing cylinder; S6: Start the inner diameter measuring trolley and drive the inner diameter measuring trolley to drive the inner diameter measuring support cylinder into the seamless pipe body; S7: Start the piston rod of the lever balancing cylinder to drive the gas into the A chamber of the lever balancing cylinder; S8: Start the inner diameter measuring trolley to drive the inner diameter measuring support cylinder to slowly separate from the seamless pipe body; S9: Use axial coordinate discrete points to collect and record the inner diameter data of the seamless pipe body; S10: Start the axial movement of the trolley and adjust the position of the axial trolley through machine vision and CCD camera photography results; S11: Record the length data of the seamless pipe body.

Images