A seamless steel tube coaxiality detection device and a detection method thereof

Abstract

The application belongs to the technical field of seamless steel pipe detection, and discloses a seamless steel pipe coaxiality detection device and a detection method thereof, which comprises a multi-surface column, the top of the multi-surface column is fixedly connected with a support plate, and a threaded shaft is rotatably sleeved in the inside of the multi-surface column. When moving downward, the eccentricity of the shaft center of the seamless steel pipe is considered, the intermittent extrusion compression assembly that always keeps contact is made under eccentricity, so that the hydraulic oil is pressed into the amplification assembly with a small inner diameter by using the compression assembly with a large inner diameter, and the amplification assembly quickly pushes the adjusting rod and the marking head to make a large displacement, so that the marking head contacts the marking assembly and completes marking, thereby the coaxiality detection is conveniently and intuitively carried out in a mechanical way without relying on laser sensing technology, the eccentric position and the eccentric number of the seamless steel pipe are judged according to the marking position and the marking condition on the marking assembly, the actual detection is simple and convenient, the detection result is directly obtained, and the use effect is good.

Description

Technical Field

[0001] This invention belongs to the field of seamless steel pipe testing technology, specifically a device and method for testing the coaxiality of seamless steel pipes. Background Technology

[0002] Seamless steel pipe is a commonly used type of steel pipe, characterized by the absence of welded joints and a seamless overall appearance. It is manufactured from a single piece of steel through processes such as heating, piercing, and rolling. Seamless steel pipes are widely used in petroleum, chemical, natural gas, aviation, shipbuilding, power, and heavy machinery industries. Common seamless steel pipe materials include carbon steel, alloy steel, and stainless steel, with the selection depending on the specific application and requirements. During the production, processing, and use of seamless steel pipes, coaxiality testing is necessary to ensure that the central axis of the pipe cross-section is aligned and to identify defective products.

[0003] Existing seamless steel pipe coaxiality testing devices typically employ laser sensing or fiber optic sensing technologies for coaxiality detection. The laser or fiber optic sensor scans along the pipe's axial direction, measuring the seamless steel pipe's diameter and calculating the result by comparing diameter data at different locations. However, the actual testing cost of this sensing technology is high. Furthermore, when testing large-diameter seamless steel pipes, laser sensors can only operate within a limited scanning range; areas exceeding the sensor's coverage may not be fully detected, leading to incomplete or missing data. Additionally, applying sensing technology to large-diameter seamless steel pipes presents challenges in positioning and complex data processing, resulting in poor actual testing accuracy and unsatisfactory performance.

[0004] Furthermore, existing seamless steel pipe coaxiality testing devices, when using sensing technology for coaxiality testing, suffer from data deviations due to the influence of solid impurities adhering to the inner and outer walls of the seamless steel pipe. This is especially true for the inner wall of the seamless steel pipe, where solid impurities are difficult to clean easily. Even with residual solid impurities, movement interference still exists when using laser sensing technology for testing, resulting in deviations in the actual coaxiality test data and poor testing accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for detecting the coaxiality of seamless steel pipes, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a seamless steel pipe coaxiality testing device and its testing method, comprising a multi-faceted column, a support plate fixedly connected to the top of the multi-faceted column, a threaded shaft rotatably sleeved inside the multi-faceted column, one end of the threaded shaft passing through the support plate and extending to the outside, a connecting shaft fixedly connected to the upper end of the threaded shaft, a first gear fixedly sleeved on the outer side of the connecting shaft, a rotating assembly provided on the top of the support plate, the rotating assembly meshing with the first gear, a sliding groove and an installation groove respectively opened on the outer surface of the multi-faceted column, a marking assembly rotatably installed in the installation groove, a transverse moving assembly movably sleeved on the outer side of the multi-faceted column, the transverse moving assembly being threadedly sleeved with the threaded shaft, a moving part provided on the outer side of the transverse moving assembly, a compression assembly fixedly connected to the inner end of the moving part, a connecting rod fixedly connected between the compression assembly and the transverse moving assembly, an amplification assembly fixedly connected to the inner end of the compression assembly, a marking head fixedly sleeved on one end of the amplification assembly, the marking head being located on the side close to the marking assembly.

[0007] Preferably, the multifaceted column includes a column body, a first face, and a second face. The number of the first face and the number of the second face are both three. The three first faces and the three second faces are distributed in a ring at equal intervals on the outer surface of the column body, and the three first faces and the three second faces are distributed alternately.

[0008] Preferably, the sliding groove is formed on the first surface, the mounting groove is formed on the second surface, the column has an internal cavity, the first surface is connected to the internal cavity, a positioning rod is fixedly connected to the top of the inner surface of the mounting groove, and a threaded hole is formed at the bottom of the mounting groove, with a positioning bolt threaded into the internal thread of the threaded hole.

[0009] Preferably, the rotating assembly includes a mounting bracket, a motor, a rotating shaft, and a second gear. The mounting bracket is fixedly mounted on the top of the support plate, the motor is fixedly sleeved inside the mounting bracket, the rotating shaft is fixedly connected to the output shaft of the motor, and the second gear is fixedly sleeved on the outer surface of the rotating shaft. The second gear meshes with the first gear.

[0010] Preferably, the lateral movement assembly includes a connecting ring, a threaded sleeve, and a sliding plate. The connecting ring is located on the outside of the multifaceted column. The threaded sleeve is movably fitted inside the inner cavity. The sliding plate is fixedly connected between the connecting ring and the sliding plate. The inside of the threaded sleeve is threadedly fitted with a threaded shaft. The sliding plate is slidably fitted inside the groove. The outer surface of the connecting ring is fixedly connected to the connecting rod. The inside of the connecting ring is provided with an annular cavity. An air jet pipe is fixedly connected to the outer surface of the connecting ring.

[0011] Preferably, the compression assembly includes a mounting sleeve, a first spring, a push plate, a push rod, and a side hole. The top of the mounting sleeve is fixedly connected to the connecting rod. The first spring is fixedly connected inside the mounting sleeve. The push plate is movably sleeved inside the mounting sleeve and fixedly connected to the first spring. The push rod is movably sleeved on the end face of the mounting sleeve. The inner and outer ends of the push rod are fixedly connected to the push plate and the moving part, respectively. The side hole is opened on the end face of the mounting sleeve.

[0012] Preferably, the amplification assembly includes a fixed tube, a movable ring, an adjusting rod, a sleeve, a retaining plate, and a retaining groove. The fixed tube is fixedly connected to the end face of the mounting sleeve and communicates with the side hole. The movable ring is movably sleeved inside the fixed tube. The adjusting rod is threadedly sleeved inside the movable ring. The sleeve is fixedly sleeved on the outer end of the adjusting rod, and the inside of the sleeve is fixedly sleeved with the marking head. The retaining plate is fixedly connected to the outer surface of the movable ring. The retaining groove is opened inside the fixed tube, and the inner surface of the retaining groove is movably sleeved with the retaining plate. The limiting ring is fixedly sleeved inside the fixed tube. The second spring is fixedly connected between the limiting ring and the movable ring.

[0013] Preferably, the marking assembly includes a round rod, a marking ring, and positioning holes. The round rod is located in the mounting groove, the marking ring is fixedly sleeved on the outer surface of the round rod, and the positioning holes are opened at both ends of the round rod. The interiors of the two positioning holes are respectively movably sleeved with the positioning rod and the positioning bolt.

[0014] Preferably, the top of the support plate is provided with an air supply mechanism, which includes an air supply sleeve, a fan blade, and an air inlet. The air supply sleeve is located outside the rotating shaft and is fixedly connected to the top of the support plate. The fan blade is located inside the air supply sleeve and is fixedly sleeved on the surface of the rotating shaft. The air inlet is opened at the top of the air supply sleeve. A through hole is opened on the top surface of the support plate, which is connected to the air supply sleeve. A connecting pipe is fixedly connected between the support plate and the connecting ring, and the upper end of the connecting pipe is connected to the through hole.

[0015] A detection method for a seamless steel pipe coaxiality detection device includes the following detection steps:

[0016] Step 1: Place the multi-faceted column inside the seamless steel pipe, keeping the surrounding movable parts at the top of the seamless steel pipe, and keeping the three sets of movable parts in contact with the inner wall of the seamless steel pipe. Rotate the adjusting rod in the magnification assembly and move the marking head closer to the marking assembly to complete the initial adjustment.

[0017] Step 2: Start the rotating assembly, which drives the first gear to rotate, causing the connecting shaft and the threaded shaft to rotate. This causes the transverse component to slide downwards along the multifaceted column. At the same time, the connecting rod drives the compression component and the moving part to move downwards. As the moving part moves along the inner wall of the seamless steel pipe, when the cross-section of the seamless steel pipe is not aligned with the initial axis at the top, the hydraulic oil in the compression assembly is squeezed as the moving part moves downwards. This causes the hydraulic oil to enter the amplification component and push the movable ring and the adjusting rod to move laterally. Simultaneously, the marking head quickly contacts the marking component and marks different points on the marking component as it moves downwards.

[0018] Step 3: As the device moves downwards for testing, the rotating component drives the fan blades in the air supply mechanism to rotate and generate axial airflow. External air is drawn into the air supply sleeve and enters the connecting ring of the transverse component through the through hole and connecting pipe. It is then ejected through the jet pipe connected to the outside. As the device moves downwards for testing, the jet pipe blows the inner wall of the seamless steel pipe below the moving part and completes the testing.

[0019] Step 4: After completing the test, remove the device and observe the marking points on the marking component. Determine the quantity and location of the seamless steel pipe's axial offset based on the number and location of the marking points.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This invention utilizes a ring-shaped distribution of movable parts to adapt to the inner wall of a seamless steel pipe. A multi-faceted column is located in the middle of the three sets of movable parts and is fitted inside the seamless steel pipe, serving as a reference axis during initial placement. As the rotating assembly moves the transverse assembly downwards, the movable parts continuously move downwards along the inner wall of the seamless steel pipe. During this downward movement, based on the eccentricity of the seamless steel pipe's axis, the movable parts, which remain in contact under eccentricity, intermittently compress the assembly. This utilizes the large-diameter compression assembly to force hydraulic oil into the small-diameter amplification assembly, causing the amplification assembly to rapidly push the adjusting rod and the marking head to a large displacement. This allows the marking head to contact the marking assembly and complete the marking. Thus, without relying on laser sensing technology, a convenient and intuitive mechanical method is used for coaxiality detection. Based on the marking position and marking pattern on the marking assembly, the eccentricity position and number of the seamless steel pipe can be determined. The actual detection is simple and convenient, the detection results are directly obtained, and the usage effect is good.

[0022] 2. This invention utilizes a rotatable and adjustable marking assembly. After inspecting a group of seamless steel pipes, the unmarked side can be replaced by rotating the round rod and marking ring in the marking assembly, allowing for rapid inspection of the next group of seamless steel pipes. The actual replacement and inspection operation is convenient, and the inspection marks for different groups of seamless steel pipes are distributed on the outside of the marking ring. By rotating the marking ring, the inspection marks of different groups can be compared and observed. For seamless steel pipes produced in the same batch, by comparing and observing the marking situation, the quality and coaxiality of the batch of seamless steel pipes can be intuitively summarized, resulting in good performance.

[0023] 3. This invention fixes a connecting jet pipe to the outside of the connecting ring of the transverse component, and uses the rotating shaft in the rotating component to rotate the fan blades in the air supply mechanism. Thus, while the transverse component moves downward for detection, the generated axial airflow is introduced into the jet pipe through the connecting pipe and the connecting ring. During the downward detection, the inner wall of the seamless steel pipe is blown by the air force, which effectively avoids solid particle impurities from affecting the detection accuracy. The actual cleaning is achieved simultaneously, which is efficient and convenient, and greatly improves the actual detection accuracy. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a partial cross-sectional view of the present invention;

[0026] Figure 3 This is a cross-sectional view of the lower end of the polyhedron of the present invention;

[0027] Figure 4 This is a schematic diagram of the top of the support base of the present invention;

[0028] Figure 5 This is a schematic diagram of the bottom surface of the support base of the present invention;

[0029] Figure 6 This is a schematic diagram showing the connection between the transverse moving component and the compression component of the present invention;

[0030] Figure 7 This is a schematic diagram of the explosion between the transverse component and the jet tube of the present invention;

[0031] Figure 8 This is a cross-sectional schematic diagram of the compression component and the amplification component of the present invention;

[0032] Figure 9 This is an exploded view of the magnification component of the present invention;

[0033] Figure 10 This is a partial cross-sectional view of the marking component of the present invention;

[0034] Figure 11 This is a cross-sectional view of the connecting ring of the present invention;

[0035] Figure 12 This is an exploded view of the air supply mechanism of the present invention;

[0036] Figure 13 This is a cross-sectional view of the top end of the polyhedral column of the present invention.

[0037] In the diagram: 1. Multifaceted column; 1001. Column body; 1002. Surface No. 1; 1003. Surface No. 2; 2. Support plate; 3. Threaded shaft; 4. Connecting shaft; 5. Gear No. 1; 6. Rotating assembly; 61. Mounting bracket; 62. Motor; 63. Rotating shaft; 64. Gear No. 2; 7. Internal cavity; 8. Slide groove; 9. Mounting groove; 10. Lateral movement assembly; 101. Connecting ring; 102. Threaded sleeve; 103. Slide plate; 11. Moving part; 12. Compression assembly; 121. Mounting sleeve; 122. Spring No. 1; 123. Push plate; 124. Push rod; 125. 13. Side hole; 14. Connecting rod; 15. Amplifying component; 16. Fixed tube; 17. Movable ring; 18. Adjusting rod; 19. Socket joint; 10. Clamping plate; 10. Slot; 11. Limiting ring; 12. No. 2 spring; 13. Marking head; 14. Marking component; 15. Round rod; 16. Marking ring; 17. Positioning hole; 18. Air supply mechanism; 19. Air supply sleeve; 10. Fan blade; 11. Air inlet; 12. Connecting pipe; 13. Jet pipe; 24. Through hole; 25. Threaded hole; 26. Positioning bolt; 27. Positioning rod. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] like Figures 1 to 13As shown, this embodiment of the invention provides a seamless steel pipe coaxiality testing device and its testing method, including a multi-faceted column 1, a support plate 2 fixedly connected to the top of the multi-faceted column 1, a threaded shaft 3 rotatably sleeved inside the multi-faceted column 1, one end of the threaded shaft 3 passing through the support plate 2 and extending to the outside, a connecting shaft 4 fixedly connected to the upper end of the threaded shaft 3, a first gear 5 fixedly sleeved on the outer side of the connecting shaft 4, a rotating assembly 6 provided on the top of the support plate 2, the rotating assembly 6 meshing with the first gear 5, and grooves 8 and mounting grooves 8 respectively opened on the outer surface of the multi-faceted column 1. The marking component 16 is rotatably installed in the groove 9. The outer side of the multifaceted column 1 is movably sleeved with the transverse component 10. The transverse component 10 is threadedly sleeved with the threaded shaft 3. The outer side of the transverse component 10 is provided with a moving part 11. The inner end of the moving part 11 is fixedly connected with a compression component 12. A connecting rod 13 is fixedly connected between the compression component 12 and the transverse component 10. The inner end of the compression component 12 is fixedly connected with an amplification component 14. One end of the amplification component 14 is fixedly sleeved with a marking head 15. The marking head 15 is located on the side close to the marking component 16.

[0040] First embodiment: The multifaceted column 1 is fitted inside the seamless steel pipe. The moving parts 11, which are distributed around the pipe, are located at the top of the seamless steel pipe and on the side close to the support plate 2. The three sets of moving parts 11 are kept in contact with the inner wall of the seamless steel pipe at the same time. The adjusting rod 143 in the adjustment and amplification assembly 14 is rotated, so that the adjusting rod 143 rotates and moves along the movable ring 142, and drives the sleeve joint 144 to move, so that the marking head 15 moves closer to the marking assembly 16, completing the initial adjustment. The rotating assembly 6 is started, so that the motor 62 in the rotating assembly 6 drives the rotating shaft 63 to rotate, and the second gear 64 drives the first gear 5 to rotate, so that the connecting shaft 4 and the threaded shaft 3 rotate synchronously. As the threaded sleeve 102 in the transverse moving assembly 10 rotates under the rotation of the internal threaded shaft 3, the threaded sleeve 102 is guided downward by the slide plate 103 that is movably fitted in the slide groove 8, so that the transverse moving assembly 10 slides downward along the multifaceted column 1. At the same time, the compression assembly 12 and the moving parts 11 are driven downward by the connecting rod 13. The moving part 11 moves along the inner wall of the seamless steel pipe. When the cross-section of the seamless steel pipe is not aligned with the initial axis at the top, the moving part 11 is pushed to make adaptive contact at the eccentric point of the inner wall of the seamless steel pipe as it moves downward. This squeezes the hydraulic oil in the compression assembly 12, causing the push plate 123 in the compression assembly 12 to compress the internal hydraulic oil. The hydraulic oil then enters the fixed pipe 141 in the amplification assembly 14 through the side hole 125, pushing the movable ring 142 and the adjusting rod 143 to move laterally. At the same time, the marking head 15 quickly contacts the marking assembly 16. As it moves downward, it marks different points on the marking assembly 16. After the test is completed, the device is removed and the marking points on the marking assembly 16 are observed. The number and position of the marking points determine the number and position of the axis offset of the seamless steel pipe. When the next set of seamless steel pipes needs to be tested, the positioning bolt 22 at the bottom is loosened, and the round rod 161 and the marking ring 162 are rotated so that the side of the replacement marking faces outward. The next set of testing markings can then be performed.

[0041] First, by utilizing the surrounding distributed moving parts 11 to adapt to the inner wall of the seamless steel pipe, and by using the multifaceted column 1 located in the middle of the three sets of moving parts 11 and sleeved inside the seamless steel pipe, serving as the reference axis during initial placement, as the rotating component 6 moves the transverse component 10 downward, the moving parts 11 are driven to move continuously downward along the inner wall of the seamless steel pipe. During the downward movement, according to the eccentricity of the seamless steel pipe axis, the moving parts 11, which are always in contact, intermittently squeeze and compress the component 12. Thus, the large-diameter compression component 12 presses hydraulic oil into the small-diameter amplification component 14, causing the amplification component 14 to quickly push the adjusting rod 143 and the marking head 15 to make a large displacement, so that the marking head 15 contacts the marking component 16 and completes the marking. Thus, without relying on laser sensing technology, a convenient and intuitive coaxiality detection is performed mechanically. Based on the marking position and marking condition on the marking component 16, the eccentricity position and number of the seamless steel pipe are determined. The actual detection is simple and convenient, the detection results are obtained directly, and the use effect is good.

[0042] Furthermore, by utilizing the rotatable and adjustable marking component 16, after completing the inspection of a group of seamless steel pipes, the unmarked side can be replaced by rotating the round rod 161 and marking ring 162 in the marking component 16, allowing for quick inspection of the next group of seamless steel pipes. The actual replacement and inspection operation is convenient, and the inspection marks for different groups of seamless steel pipes are all distributed on the outside of the marking ring 162. By rotating the marking ring 162, the inspection marks of different groups can be compared and observed. For seamless steel pipes produced in the same batch, by comparing and observing the marking situation, the quality and coaxiality of the batch of seamless steel pipes can be intuitively summarized, resulting in good usage effects.

[0043] like Figure 1 , Figure 2 , Figure 3 ,and Figure 13 As shown, the multifaceted column 1 includes a column body 1001, a first surface 1002, and a second surface 1003. There are three first surfaces 1002 and three second surfaces 1003. The three first surfaces 1002 and three second surfaces 1003 are distributed in a ring at equal intervals on the outer surface of the column body 1001. The three first surfaces 1002 and three second surfaces 1003 are distributed alternately. A sliding groove 8 is opened on the first surface 1002, and a mounting groove 9 is opened on the second surface 1003. An internal cavity 7 is opened inside the column body 1001. The first surface 1002 is connected to the internal cavity 7. A positioning rod 23 is fixedly connected to the top of the inner surface of the mounting groove 9. A threaded hole 21 is opened at the bottom of the mounting groove 9. A positioning bolt 22 is threaded into the inside of the threaded hole 21.

[0044] During use, by adapting the arrangement of the slide plate 103 and the marking component 16 through the first surface 1002 and the second surface 1003, stable up and down movement is maintained while facilitating marking.

[0045] like Figure 1 , Figure 4 and Figure 5 As shown, the rotating assembly 6 includes a mounting bracket 61, a motor 62, a rotating shaft 63, and a second gear 64. The mounting bracket 61 is fixedly mounted on the top of the support plate 2. The motor 62 is fixedly sleeved inside the mounting bracket 61. The rotating shaft 63 is fixedly connected to the output shaft of the motor 62. The second gear 64 is fixedly sleeved on the outer surface of the rotating shaft 63. The second gear 64 meshes with the first gear 5.

[0046] During use, the rotational force is provided by the rotating component 6, and the rotational control of the threaded shaft 3 is achieved by the meshing of the second gear 64 and the first gear 5.

[0047] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 11 As shown, the transverse component 10 includes a connecting ring 101, a threaded sleeve 102, and a sliding plate 103. The connecting ring 101 is located on the outside of the multifaceted column 1. The threaded sleeve 102 is movably sleeved inside the inner cavity 7. The sliding plate 103 is fixedly connected between the connecting ring 101 and the sliding plate 103. The inside of the threaded sleeve 102 is threadedly sleeved with the threaded shaft 3. The sliding plate 103 is slidably sleeved inside the slide groove 8. The outer surface of the connecting ring 101 is fixedly connected to the connecting rod 13. The inside of the connecting ring 101 is provided with an annular cavity. An air jet pipe 19 is fixedly connected to the outer surface of the connecting ring 101.

[0048] During use, the jet pipe 19 is arranged by using the transverse component 10, and the compression component 12 and the moving part 11 are arranged at the same time. Stable up-and-down movement control is achieved by sliding the slide plate 103 in conjunction with the threaded shaft 3.

[0049] like Figure 1 , Figure 2 , Figure 6 , Figure 8 and Figure 9As shown, the compression assembly 12 includes a mounting sleeve 121, a first spring 122, a push plate 123, a push rod 124, and a side hole 125. The top of the mounting sleeve 121 is fixedly connected to the connecting rod 13. The first spring 122 is fixedly connected inside the mounting sleeve 121. The push plate 123 is movably sleeved inside the mounting sleeve 121 and fixedly connected to the first spring 122. The push rod 124 is movably sleeved on the end face of the mounting sleeve 121. The inner and outer ends of the push rod 124 are fixedly connected to the push plate 123 and the moving part 11, respectively. The side hole 125 is opened on the end face of the mounting sleeve 121. The amplification assembly 14 includes a fixed tube 141, a movable ring 142, an adjusting rod 143, a socket joint 144, a clamping plate 145, and... The slot 146 and the fixed tube 141 are fixedly connected to the end face of the mounting sleeve 121 and communicate with the side hole 125. The movable ring 142 is movably sleeved inside the fixed tube 141. The adjusting rod 143 is threadedly sleeved inside the movable ring 142. The sleeve 144 is fixedly sleeved on the outer end of the adjusting rod 143. The inside of the sleeve 144 is fixedly sleeved with the marking head 15. The locking plate 145 is fixedly connected to the outer surface of the movable ring 142. The slot 146 is opened inside the fixed tube 141. The inner surface of the slot 146 is movably sleeved with the locking plate 145. The limiting ring 147 is fixedly sleeved inside the fixed tube 141. The second spring 148 is fixedly connected between the limiting ring 147 and the movable ring 142.

[0050] During use, the compression component 12 squeezes the internal lubricating oil according to the compression of the moving part 11, and pushes it into the amplification component 14. Through the large diameter difference, the displacement is amplified, and the displacement distance of the moving part 11 due to the axial eccentricity of the seamless steel pipe inner wall is amplified into the moving distance of the marking head 15. Thus, the eccentricity is accurately recorded under the marking. The elasticity of the second spring 148 and the first spring 122 facilitates reset.

[0051] like Figure 2 , Figure 3 , Figure 10 and Figure 12 As shown, the marking assembly 16 includes a round rod 161, a marking ring 162, and a positioning hole 163. The round rod 161 is located in the mounting groove 9. The marking ring 162 is fixedly sleeved on the outer surface of the round rod 161. The positioning holes 163 are opened at both ends of the round rod 161. The interiors of the two positioning holes 163 are respectively movably sleeved with the positioning rod 23 and the positioning bolt 22.

[0052] During use, the marking ring 162 is an elastic, coatable ring, which facilitates coloring when the marking head 15 contacts it, while also allowing for compression to prevent rigid contact and breakage. It is connected to the positioning rod 23 through the positioning hole 163 and can be clamped and fixed with the positioning bolt 22. When loosened, it is easy to rotate and adjust to different angles for marking other sides.

[0053] like Figure 1, Figure 2 , Figure 4 , Figure 5 , Figure 11 and Figure 12 As shown, the top of the support plate 2 is provided with an air supply mechanism 17. The air supply mechanism 17 includes an air supply sleeve 171, a fan blade 172 and an air inlet 173. The air supply sleeve 171 is located outside the rotating shaft 63 and is fixedly connected to the top of the support plate 2. The fan blade 172 is located inside the air supply sleeve 171 and is fixedly sleeved on the surface of the rotating shaft 63. The air inlet 173 is opened on the top of the air supply sleeve 171. The top surface of the support plate 2 is provided with a through hole 20, which is connected to the air supply sleeve 171. A connecting pipe 18 is fixedly connected between the support plate 2 and the connecting ring 101. The upper end of the connecting pipe 18 is connected to the through hole 20.

[0054] During use, the rotating component 6 rotates to move the horizontal component 10 downward, which in turn drives the fan blade 172 in the air supply mechanism 17 to rotate. The air volume is then guided into the jet pipe 19, and the inner wall of the pipe is cleaned simultaneously during the inspection.

[0055] Second embodiment: During the downward movement for detection, the rotating shaft 63 in the rotating assembly 6 drives the fan blade 172 in the air supply mechanism 17 to rotate and generate axial airflow. External air is drawn into the air supply sleeve 171 through the air inlet 173, and enters the connecting ring 101 of the transverse moving assembly 10 through the through hole 20 and the connecting pipe 18. It is also ejected through the externally connected jet pipe 19. During the downward detection process, the surrounding jet pipes 19 blow on the inner wall of the seamless steel pipe below the moving part 11 and complete the detection at the same time.

[0056] First, by fixing the connecting jet pipe 19 to the outside of the connecting ring 101 of the transverse component 10, and cooperating with the rotating shaft 63 in the rotating component 6 to rotate the fan blade 172 in the air supply mechanism 17, the axial air generated is introduced into the jet pipe 19 through the connecting pipe 18 and the connecting ring 101 while the transverse component 10 moves downward for detection. During the downward detection, the inner wall of the seamless steel pipe is blown by the wind, which effectively avoids solid particulate impurities from affecting the detection accuracy. The actual cleaning is achieved simultaneously, which is efficient and convenient and greatly improves the actual detection accuracy.

[0057] A detection method for a seamless steel pipe coaxiality detection device includes the following detection steps:

[0058] Step 1: Place the multifaceted column 1 inside the seamless steel pipe, keep the surrounding movable parts 11 at the top of the seamless steel pipe, keep the three sets of movable parts 11 in contact with the inner wall of the seamless steel pipe, rotate and adjust the adjusting rod 143 in the magnification assembly 14 and drive the marking head 15 closer to the marking assembly 16 to complete the initial adjustment;

[0059] Step 2: Start the rotating component 6, which drives the first gear 5 to rotate, causing the connecting shaft 4 and the threaded shaft 3 to rotate. This causes the transverse component 10 to slide downward along the multifaceted column 1. At the same time, the connecting rod 13 drives the compression component 12 and the moving part 11 to move downward. As the moving part 11 moves along the inner wall of the seamless steel pipe, when the cross-section of the seamless steel pipe is not consistent with the initial axis at the top, the hydraulic oil in the compression component 12 is squeezed when the moving part 11 moves downward. This causes the hydraulic oil to enter the amplification component 14 and push the movable ring 142 and the adjusting rod 143 to move laterally. At the same time, the marking head 15 quickly contacts the marking component 16. As it moves downward, it continuously marks different marking points on the marking component 16.

[0060] Step 3: As the device moves downward for testing, the rotating component 6 drives the fan blades 172 in the air supply mechanism 17 to rotate and generate axial airflow. External air is drawn into the air supply sleeve 171 and enters the connecting ring 101 of the transverse component 10 through the through hole 20 and the connecting pipe 18. It is then ejected through the externally connected jet pipe 19. As the device moves downward for testing, the jet pipe 19 blows the inner wall of the seamless steel pipe below the moving part 11 and completes the testing.

[0061] Step 4: After completing the test, remove the device and observe the marking points on the marking component 16. Determine the number and position of the seamless steel pipe's axial offset based on the number and position of the marking points.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the coaxiality of seamless steel pipes, comprising a multi-faceted column, characterized in that: A support plate is fixedly connected to the top of the multifaceted column. A threaded shaft is rotatably sleeved inside the multifaceted column. One end of the threaded shaft passes through the support plate and extends to the outside. A connecting shaft is fixedly connected to the upper end of the threaded shaft. A first gear is fixedly sleeved on the outer side of the connecting shaft. A rotating assembly is provided on the top of the support plate. The rotating assembly meshes with the first gear. The multifaceted column includes a column body, a first face, and a second face. The three first faces and the three second faces are all distributed in annular, equally spaced, and alternating patterns on the outer surface of the column body. A sliding groove is formed on the first face, and a mounting groove is formed on the second face. An internal cavity is formed inside the column body, and the first face communicates with the internal cavity. A marking component is rotatably installed in the mounting groove. The marking component includes a round rod, a marking ring, and a positioning hole. The round rod is located in the mounting groove, and the marking ring is fixedly sleeved on the outer surface of the round rod. The transverse assembly includes a connecting ring, a threaded sleeve, and a sliding plate. The connecting ring is located on the outside of the multifaceted column. The threaded sleeve is movably fitted inside the inner cavity. The sliding plate is fixedly connected between the connecting ring and the threaded sleeve. The inside of the threaded sleeve is threadedly fitted with the threaded shaft. The sliding plate is slidably fitted inside the slide groove. The outer surface of the connecting ring is fixedly connected to the connecting rod. The outer side of the transverse component is provided with a moving part, the inner end of the moving part is fixedly connected to a compression component, a connecting rod is fixedly connected between the compression component and the transverse component, the inner end of the compression component is fixedly connected to an amplification component, one end of the amplification component is fixedly sleeved with a marking head, and the marking head is located on the side close to the marking component. The multifaceted column is fitted inside the seamless steel pipe and serves as the reference axis during initial placement. The rotation component is activated, causing the transverse component to move downwards along the multifaceted column, which in turn drives the moving part to move continuously downwards along the inner wall of the seamless steel pipe. Due to the eccentricity of the seamless steel pipe's axis, the moving part, which always maintains contact, intermittently squeezes and compresses the component. This allows the large-diameter compression component to press hydraulic oil into the small-diameter amplification component, causing the amplification component to push the marking head to move. The marking head contacts the marking component and completes the marking. Based on the number and position of the marking points on the marking component, the number and position of the seamless steel pipe's axis offset are determined. After completing the inspection of a set of seamless steel pipes, the unmarked side of the marking ring is replaced using a rotating marking component, and the next set of seamless steel pipes is inspected. By comparing and observing different sets of markings, the coaxiality of the seamless steel pipes in the same batch can be obtained.

2. The seamless steel pipe coaxiality testing device according to claim 1, characterized in that: A positioning rod is fixedly connected to the top of the inner surface of the mounting groove, and a threaded hole is opened at the bottom of the mounting groove, with a positioning bolt threaded into the internal thread of the threaded hole.

3. The seamless steel pipe coaxiality testing device according to claim 2, characterized in that: The rotating assembly includes a mounting bracket, a motor, a rotating shaft, and a second gear. The mounting bracket is fixedly mounted on the top of the support plate. The motor is fixedly sleeved inside the mounting bracket. The rotating shaft is fixedly connected to the output shaft of the motor. The second gear is fixedly sleeved on the outer surface of the rotating shaft. The second gear meshes with the first gear.

4. The seamless steel pipe coaxiality testing device according to claim 3, characterized in that: The connecting ring has an annular cavity inside, and a jet pipe is fixedly connected to the outer surface of the connecting ring.

5. The seamless steel pipe coaxiality testing device according to claim 4, characterized in that: The compression assembly includes a mounting sleeve, a first spring, a push plate, a push rod, and a side hole. The top of the mounting sleeve is fixedly connected to the connecting rod. The first spring is fixedly connected inside the mounting sleeve. The push plate is movably sleeved inside the mounting sleeve and fixedly connected to the first spring. The push rod is movably sleeved on the end face of the mounting sleeve. The inner and outer ends of the push rod are fixedly connected to the push plate and the moving part, respectively. The side hole is opened on the end face of the mounting sleeve.

6. The seamless steel pipe coaxiality testing device according to claim 5, characterized in that: The amplification assembly includes a fixed tube, a movable ring, an adjusting rod, a sleeve, a retaining plate, and a retaining groove. The fixed tube is fixedly connected to the end face of the mounting sleeve and communicates with the side hole. The movable ring is movably sleeved inside the fixed tube. The adjusting rod is threadedly sleeved inside the movable ring. The sleeve is fixedly sleeved on the outer end of the adjusting rod, and the inside of the sleeve is fixedly sleeved with the marking head. The retaining plate is fixedly connected to the outer surface of the movable ring. The retaining groove is opened inside the fixed tube, and the inner surface of the retaining groove is movably sleeved with the retaining plate. The limiting ring is fixedly sleeved inside the fixed tube. A second spring is fixedly connected between the limiting ring and the movable ring.

7. The seamless steel pipe coaxiality testing device according to claim 6, characterized in that: The positioning holes are opened at both ends of the round rod, and the interiors of the two positioning holes are respectively movably connected to the positioning rod and the positioning bolt.

8. The seamless steel pipe coaxiality testing device according to claim 7, characterized in that: The top of the support plate is provided with an air supply mechanism, which includes an air supply sleeve, a fan blade, and an air inlet. The air supply sleeve is located outside the rotating shaft and is fixedly connected to the top of the support plate. The fan blade is located inside the air supply sleeve and is fixedly sleeved on the surface of the rotating shaft. The air inlet is opened at the top of the air supply sleeve. A through hole is opened on the top surface of the support plate, which is connected to the air supply sleeve. A connecting pipe is fixedly connected between the support plate and the connecting ring, and the upper end of the connecting pipe is connected to the through hole.

9. The detection method of the seamless steel pipe coaxiality detection device according to claim 8, characterized in that: The following testing steps are included: Step 1: Place the multi-faceted column inside the seamless steel pipe, keeping the surrounding movable parts at the top of the seamless steel pipe, and keeping the three sets of movable parts in contact with the inner wall of the seamless steel pipe. Rotate the adjusting rod in the magnification assembly and move the marking head closer to the marking assembly to complete the initial adjustment. Step 2: Start the rotating assembly, which drives the first gear to rotate, causing the connecting shaft and threaded shaft to rotate. This causes the transverse assembly to slide downwards along the multifaceted column. At the same time, the connecting rod drives the compression assembly and the moving part to move downwards. As the moving part moves along the inner wall of the seamless steel pipe, when the cross-section of the seamless steel pipe is not aligned with the initial axis at the top, the hydraulic oil in the compression assembly is squeezed as the moving part moves downwards. This causes the hydraulic oil to enter the amplification assembly and push the movable ring and adjusting rod to move laterally. Simultaneously, the marking head contacts the marking assembly. As it moves downwards, it marks different marking points on the marking assembly. Step 3: As the device moves downwards for testing, the rotating component drives the fan blades in the air supply mechanism to rotate and generate axial airflow. External air is drawn into the air supply sleeve and enters the connecting ring of the transverse component through the through hole and connecting pipe. It is then ejected through the jet pipe connected to the outside. As the device moves downwards for testing, the jet pipe blows the inner wall of the seamless steel pipe below the moving part and completes the testing. Step 4: After completing the test, remove the device and observe the marking points on the marking component. Determine the quantity and location of the seamless steel pipe's axial offset based on the number and location of the marking points.

Images