Steel pipe straightness laser measuring machine and method based on seamless steel pipe hot rolling processing

Abstract

The invention discloses a steel pipe straightness laser measuring machine and method based on seamless steel pipe hot rolling machining, the steel pipe straightness laser measuring machine comprises a machine box and further comprises a placing frame, the placing frame is fixedly arranged on the rear wall of an inner cavity of the machine box, and an electric telescopic rod is fixedly arranged at the top of the placing frame, and the invention relates to the technical field of laser measuring machines. According to the steel pipe straightness laser measuring machine and method based on seamless steel pipe hot rolling machining, through mutual cooperation of an electric telescopic rod, a base mechanism, a driving mechanism, a sliding rod, a threaded rod mechanism and a straightness laser measuring mechanism, precise clamping and rotating driving of a steel pipe can be achieved; the straightness laser measuring mechanism can move intermittently in the axial direction of the steel pipe, it is ensured that the steel pipe is detected and covered in the full circumferential direction, the straightness laser measuring mechanism can measure the straightness of the steel pipe through the laser measuring technology, the straightness of the steel pipe is detected in a contact type measuring mode, and the measuring accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of laser measuring machine technology, specifically to a laser measuring machine and method for the straightness of steel pipes based on the hot rolling process of seamless steel pipes. Background Technology

[0002] The hot rolling process for seamless steel pipes involves heating a round billet to a high temperature to soften it, then piercing it with a piercing mill to form a rough tube. The diameter and wall thickness are then reduced through multiple continuous rolling passes. Finally, the straightness is checked by a steel pipe straightness laser measuring machine. This process helps to obtain seamless steel pipes with accurate dimensions, good mechanical properties, and straightness that meet the standards. This process utilizes high-temperature plastic deformation and recrystallization to refine the grains and is suitable for large-scale production of high-quality seamless steel pipes.

[0003] Referring to the straightness measuring device disclosed in patent application CN208765680U, a laser rangefinder and a magnetic ruler are fixed to the two ends of the 0° line of a pipeline by magnetic adsorption, and the laser line is adjusted to be parallel. The straightness is measured by the movement data of the laser projection point on the magnetic ruler. The direction of the 90° line is measured in the same way. The device has a simple structure, flexible operation, can measure quickly and reduce manual input, has low requirements for measurement conditions, effectively guarantees accuracy and solves the problems of low accuracy and cumbersome operation of traditional methods, and has great prospects for promotion.

[0004] A comprehensive analysis of the above-mentioned patents reveals the following shortcomings: Existing laser measurement machines and methods for straightness of steel pipes based on hot rolling of seamless steel pipes typically rely solely on non-contact laser measurement technology to determine whether the straightness of the steel pipe meets the standards. However, laser measurement is easily affected by the surface condition of the steel pipe and environmental interference, resulting in unreliable measurement results. It is difficult to integrate contact measurement technology on the basis of laser measurement technology to form dual verification. Therefore, it is necessary to provide a laser measurement machine and method for straightness of steel pipes based on hot rolling of seamless steel pipes to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a laser measuring machine and method for straightness of steel pipes based on hot rolling of seamless steel pipes. This solves the problem that the conventional method of using non-contact laser measurement technology to measure whether the straightness of steel pipes meets the standards is easily affected by the surface condition of the steel pipe and environmental interference, resulting in poor reliability of the measurement results. It is also difficult to integrate contact measurement technology on the basis of laser measurement technology to form dual verification.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a laser measuring machine for the straightness of seamless steel pipes based on hot rolling, comprising a chassis, and further comprising: A placement rack is fixedly mounted on the rear wall of the inner cavity of the chassis. An electric telescopic rod is fixedly mounted on the top of the placement rack. A base mechanism is rotatably mounted on the bottom of the inner cavity of the placement rack via a short shaft. The bottom of the electric telescopic rod slides through the top of the placement rack and is fixedly mounted with a drive mechanism. The base mechanism and the drive mechanism cooperate to clamp the hot-rolled seamless steel pipe and drive it to rotate. A sliding rod is fixedly mounted between the upper and lower walls of the inner cavity of the placement rack, located directly in front of the drive mechanism. A threaded rod mechanism is rotatably mounted between the upper and lower walls of the inner cavity of the placement rack, located directly behind the drive mechanism. A sealing door is rotatably mounted on the front end of the chassis. An alarm is fixedly mounted on the bottom right side of the front end of the chassis. A control panel is fixedly mounted on the right side of the front end of the chassis. A central processing unit is fixedly mounted on the bottom of the inner cavity of the chassis. A straightness laser measuring mechanism is used to measure the straightness of hot-rolled seamless steel pipes. The straightness laser measuring mechanism is set between the slide bar and the threaded bar mechanism.

[0007] Preferably, the base mechanism includes a base, a central column is fixedly disposed at the top center of the base, several scales are disposed on the top of the base and on the left and right sides and front and rear ends of the central column, four anti-slip pads are evenly fixedly disposed around the top of the base and on the outer ring of the central column, the bottom center of the base is fixedly connected to the top of the short shaft, and the bottom of the short shaft is rotatably connected to the bottom of the inner cavity of the placement rack.

[0008] Preferably, the driving mechanism includes a placement box, the top of which is fixedly connected to the bottom of the electric telescopic rod. A servo motor is fixedly installed at the bottom of the inner cavity of the placement box. The output shaft of the servo motor passes through the bottom of the placement box and is fixedly fitted with a wheel column. Push plates fitted outside the output shaft are fixedly installed at both the upper and lower parts of the wheel column. A number of teeth are evenly fixedly installed in half of the circumferential outer wall of the wheel column. A top seat assembly is fixedly installed at the bottom of the lower push plate. The top seat assembly has the same structure as the base mechanism and the two are arranged symmetrically.

[0009] Preferably, the threaded rod mechanism includes a threaded rod, which is rotatably connected between the upper and lower walls of the inner cavity of the placement frame. A vertical groove is provided on the upper side wall of the threaded rod, and a gear is sleeved on the outside of the threaded rod. A protrusion that slides in the vertical groove is fixedly provided on the inner wall of the gear, and the front part of the gear is located between two push plates and meshes with the teeth.

[0010] Preferably, the straightness laser measurement mechanism includes a straightness measurement component. A cleaning component is provided at the top of the straightness measurement component, and a third ring is provided at the bottom of the straightness measurement component. Laser rangefinders are fixedly installed on the left and right side walls of the inner cavity of the third ring. The straightness measurement component includes a first ring, with an internally threaded block fixedly installed at the rear end of the first ring. The internally threaded block is threadedly sleeved on the outside of a threaded rod. A slider is fixedly installed at the front end of the first ring, and the slider is slidably sleeved on the outside of a sliding rod. Receiving boxes are fixedly installed on both the left and right sides of the first ring. Both of the aforementioned receiving boxes have a measuring rod assembly that slides through them. Both of the aforementioned receiving boxes have a spring that is sleeved on the outside of the corresponding measuring rod assembly. Both sides of the first ring have a crossbar fixedly installed in front of the corresponding receiving box. Each measuring rod assembly is provided with a measuring frame assembly between it and the adjacent crossbar. Two contact block assemblies are sleeved on the outside of each crossbar. The two contact block assemblies are symmetrically distributed on the left and right sides of the adjacent measuring frame assemblies. A marking line is provided on the top right side of the crossbar. Several scales are provided on the top of the crossbar and on both sides of the marking line.

[0011] Preferably, the measuring rod assembly includes a measuring rod, one end of which slides through the interior of the first ring and is fixedly provided with a conical head, the other end of which slides through the exterior of the receiving box, a push plate is fixedly sleeved on the exterior of the measuring rod, the push plate is slidably disposed between the inner walls of the receiving box, a plurality of graduations are evenly provided on the top of the measuring rod between the push plate and the conical head, and the spring is sleeved on the exterior of the measuring rod and located on the side of the push plate away from the first ring.

[0012] Preferably, the measuring frame assembly includes a collar, which is slidably fitted onto the outside of the measuring rod. A bolt is threaded through the top of the collar. Frame rods are fixedly installed at the upper and lower parts of the front end of the collar. A pointer is fixedly installed at the middle of the front end of the upper frame rod, with the bottom of the pointer contacting the top of the crossbar. Frames are fixedly installed between the left and right front ends of the two frame rods. Both frames are slidably fitted onto the outside of the crossbar. An inner groove is formed on the side of each frame that is far apart from each other, and a contact piece is fixedly installed on the inner groove.

[0013] Preferably, each of the contact block assemblies includes a sleeve frame that is slidably fitted onto the outside of the crossbar. A bolt 2 is threaded through the top of the sleeve frame. A contact block is fixedly disposed on the side of the sleeve frame near the frame body. A contact piece 2 is fixedly disposed around the outer wall of the contact block. The contact block is adapted to the inner groove. When the contact piece 2 contacts the adjacent contact piece 1, an electrical connection is formed.

[0014] Preferably, the cleaning component includes a second ring, the bottom left and right sides of which are fixedly connected to the top of the corresponding receiving box, and threaded rods threaded through both the left and right sides of the second ring. An arc-shaped plate is rotatably provided at the end of the two threaded rods that are close to each other. A sponge is provided on the side of the two arc-shaped plates that are close to each other by adhesive clips. Thin rods are fixedly provided at the front and rear ends of the side of the two arc-shaped plates that are far apart from each other. The thin rods slide through the second ring. The top left and right sides of the third ring are fixedly connected to the bottom of the corresponding receiving box.

[0015] This invention also provides a method for measuring the straightness of steel pipes based on the hot rolling process of seamless steel pipes, the specific method including the following steps: Step 1: Pass the hot-rolled seamless steel pipe to be measured through the straightness laser measuring mechanism and place it at the top center of the base mechanism. Then, start the electric telescopic rod to drive the driving mechanism to move down. During the downward movement of the driving mechanism, it gradually cooperates with the base mechanism to stably clamp the steel pipe. At this time, the electric telescopic rod stops working. Then, adjust the straightness laser measuring mechanism so that the straightness laser measuring mechanism contacts the outer wall of the steel pipe. Step 2: The drive mechanism starts and works with the base mechanism to drive the steel pipe to rotate. At the same time, the straightness laser measuring mechanism works to measure the straightness of the rotating steel pipe. During the operation of the drive mechanism, the threaded rod mechanism is driven to rotate intermittently, thereby driving the straightness laser measuring mechanism to move intermittently upward along the bottom of the steel pipe, so that the straightness laser measuring mechanism moves circumferentially relative to the steel pipe and intermittently moves along the axial direction of the steel pipe. Step 3: During the movement of the straightness laser measuring mechanism, not only is the straightness of the steel pipe measured using laser measurement technology, but the deviation value of the measuring point on the steel pipe is also detected mechanically. When the deviation value of the measuring point exceeds the allowable tolerance range, the alarm is triggered. This is used to measure whether the straightness of the steel pipe meets the standard, thereby completing the straightness measurement of the steel pipe.

[0016] Beneficial effects This invention provides a laser measuring machine and method for straightness measurement of seamless steel pipes based on hot rolling. Compared with the prior art, it has the following advantages: 1. A laser measuring machine and method for the straightness of seamless steel pipes based on hot rolling processing. Through the cooperation of an electric telescopic rod, a base mechanism, a drive mechanism, a sliding rod, a threaded rod mechanism, and a straightness laser measuring mechanism, it can not only achieve precise clamping and rotational drive of the steel pipe, but also enable the straightness laser measuring mechanism to move intermittently along the axial direction of the steel pipe, ensuring full circumferential inspection coverage of the steel pipe. The straightness laser measuring mechanism not only uses laser measurement technology to measure the straightness of the steel pipe, but also adds a contact measurement method to detect the straightness of the steel pipe, improving the measurement accuracy.

[0017] 2. A laser measuring machine and method for the straightness of seamless steel pipes based on hot rolling processing. Through the cooperation between the push plate, teeth, gears, protrusions, vertical grooves and the straightness laser measuring mechanism, driven by a servo motor, not only can the steel pipe be rotated, but the threaded rod can also be driven to rotate intermittently. This causes the internal thread block to move along the threaded rod in the vertical direction, and finally enables the straightness laser measuring mechanism to move intermittently along the axial direction of the steel pipe. There is no need to set up a separate drive device to drive the straightness laser measuring mechanism to move, thus improving energy utilization.

[0018] 3. A laser measuring machine and method for straightness of steel pipes based on hot rolling of seamless steel pipes. Through the cooperation of a ring, measuring rod assembly, spring, measuring frame assembly, contact block assembly, and laser rangefinders, two laser rangefinders emit laser beams perpendicular to the axis of the steel pipe to monitor the radial distance difference between the left and right sides in real time. When the difference exceeds the tolerance, an alarm is triggered, realizing non-contact rapid detection. The measuring rod assembly drives the conical head to fit against the surface of the steel pipe through the spring. With the help of the scale on the crossbar and the contact block assembly, the allowable deviation range of straightness is set. When the radial displacement of the conical head exceeds the threshold, the first contact piece and the second contact piece make contact to form an electrical connection, triggering the alarm. This realizes contact precision measurement, integrating laser measurement technology with contact measurement technology to form dual verification and ensure the reliability of the straightness measurement results.

[0019] 4. A laser measuring machine and method for the straightness of seamless steel pipes based on hot rolling processing. Through the interaction of the circular ring, the lead screw, and the sponge, the sponge can automatically wipe the outer wall of the steel pipe before measurement, effectively removing oil stains, dust and other attachments generated during hot rolling processing. This avoids interference from impurities on the steel pipe surface with laser ranging and contact measurement. The sponge can be quickly replaced with adhesive clips to ensure long-term cleanliness. The lead screw can adjust the position of the arc plate and the sponge to adapt to steel pipes of different diameters, improving the equipment's versatility.

[0020] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the chassis of the present invention; Figure 3 This is an assembly drawing of the placement frame, base mechanism, drive mechanism, and straightness laser measurement mechanism of the present invention; Figure 4This is an exploded view of the placement frame, base mechanism, drive mechanism, and straightness laser measurement mechanism of the present invention; Figure 5 This is a first perspective view of the base mechanism of the present invention; Figure 6 This is a second perspective view of the base mechanism of the present invention; Figure 7 This is a first sectional perspective view of the driving mechanism of the present invention; Figure 8 This is a second sectional perspective view of the driving mechanism of the present invention; Figure 9 This is a perspective view of the threaded rod mechanism of the present invention; Figure 10 For the present invention Figure 9 A magnified view of a section at point A in the middle; Figure 11 This is a perspective view of the gear of the present invention; Figure 12 This is a perspective view of the laser straightness measurement mechanism of the present invention; Figure 13 This is an exploded view of the laser straightness measurement mechanism of the present invention; Figure 14 This is a partial cross-sectional perspective view of the straightness measuring component of the present invention; Figure 15 This is an assembly diagram of the measuring rod assembly, crossbar, measuring frame assembly, and contact block assembly of the present invention; Figure 16 This is an exploded view of the measuring rod assembly, crossbar, measuring frame assembly, and contact block assembly of the present invention; Figure 17 This is a perspective view of the measuring frame assembly of the present invention; Figure 18 This is a perspective view of the contact block assembly of the present invention; Figure 19 This is a perspective view of the cleaning component of the present invention.

[0022] In the diagram: 1. Chassis; 2. Placement rack; 3. Electric telescopic rod; 4. Base mechanism; 41. Base; 42. Center column; 43. Scale one; 44. Anti-slip pad; 5. Drive mechanism; 51. Placement box; 52. Servo motor; 53. Wheel column; 54. Push plate; 55. Gear; 56. Top seat assembly; 6. Slide rod; 7. Threaded rod mechanism; 71. Threaded rod; 72. Vertical groove; 73. Protrusion; 74. Gear; 8. Straightness laser measurement mechanism; 81. Straightness measurement assembly; 811. Ring one; 812. Internal thread block; 813. Slider; 814. Receiving box; 815. Measuring rod assembly; 8151. Measuring rod; 8152. Push plate; 8 153. Conical head; 8154. Scale three; 816. Spring; 817. Crossbar; 818. Measuring frame assembly; 8181. Collar; 8182. Bolt one; 8183. Frame rod; 8184. Pointer; 8185. Frame; 8186. Contact piece one; 819. Contact block assembly; 8191. Sleeve frame; 8192. Bolt two; 8193. Contact block; 8194. Contact piece two; 8110. Marking line; 8111. Scale two; 82. Cleaning assembly; 821. Ring two; 822. Lead screw; 823. Arc plate; 824. Sponge wipe; 825. Thin rod; 83. Ring three; 84. Laser rangefinder; 9. Sealed door; 10. Alarm. Detailed Implementation

[0023] 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.

[0024] This invention provides two technical solutions: like Figures 1 to 4 The first embodiment is shown: a laser measuring machine for the straightness of steel pipes based on hot rolling of seamless steel pipes, including a housing 1, and further comprising: The placement rack 2 is fixedly installed on the rear wall of the inner cavity of the chassis 1. An electric telescopic rod 3 is fixedly installed on the top of the placement rack 2. A base mechanism 4 is rotatably installed at the bottom of the inner cavity of the placement rack 2 via a short shaft. The bottom of the electric telescopic rod 3 slides through the top of the placement rack 2 and is fixedly installed with a drive mechanism 5. The base mechanism 4 and the drive mechanism 5 cooperate with each other to clamp the hot-rolled seamless steel pipe and drive it to rotate. A sliding rod 6 is fixedly installed between the upper and lower walls of the inner cavity of the placement rack 2, located directly in front of the drive mechanism 5. A threaded rod mechanism 7 is rotatably installed between the upper and lower walls of the inner cavity of the placement rack 2, located directly behind the drive mechanism 5. A sealing door 9 is rotatably installed at the front end of the chassis 1. An alarm 10 is fixedly installed on the bottom right side of the front end of the chassis 1. A control panel is fixedly installed on the right side of the front end of the chassis 1. A central processing unit is fixedly installed at the bottom of the inner cavity of the chassis 1. The straightness laser measuring mechanism 8 is used to measure the straightness of the hot-rolled seamless steel pipe. The straightness laser measuring mechanism 8 is set between the slide bar 6 and the threaded rod mechanism 7.

[0025] Through the cooperation of the electric telescopic rod 3, base mechanism 4, drive mechanism 5, slide rod 6, threaded rod mechanism 7, and straightness laser measuring mechanism 8, not only can the steel pipe be precisely clamped and rotated, but the straightness laser measuring mechanism 8 can also move intermittently along the axial direction of the steel pipe to ensure full circumferential inspection coverage. The straightness laser measuring mechanism 8 can not only use laser measurement technology to measure the straightness of the steel pipe, but also adds a contact measurement method to detect the straightness of the steel pipe, improving the measurement accuracy.

[0026] like Figures 5 to 19The second embodiment is shown, and its main difference from the first embodiment is that: based on the laser measuring machine for the straightness of seamless steel pipes processed by hot rolling, the base mechanism 4 includes a base 41, a central column 42 fixedly installed at the top center of the base 41, several scales 43 are provided on the top of the base 41 and on the left and right sides and front and rear ends of the central column 42, four anti-slip pads 44 are evenly fixedly installed around the top of the base 41 and on the outer ring of the central column 42, the bottom center of the base 41 is fixedly connected to the top of the short shaft, and the bottom of the short shaft is rotatably connected to the bottom of the inner cavity of the placement frame 2. The drive mechanism 5 includes a placement box 51, the top of the placement box 51 is fixedly connected to the bottom of the electric telescopic rod 3, and a servo is fixedly installed at the bottom of the inner cavity of the placement box 51. The output shaft of the servo motor 52 passes through the bottom of the placement box 51 and is fixedly fitted with a wheel column 53. Push plates 54, fitted outside the output shaft, are fixedly installed on both the upper and lower parts of the wheel column 53. A number of teeth 55 are evenly fixedly installed in half of the outer circumference of the wheel column 53. A top seat assembly 56 is fixedly installed at the bottom of the lower push plate 54. The top seat assembly 56 has the same structure as the base mechanism 4 and the two are symmetrically arranged vertically. The threaded rod mechanism 7 includes a threaded rod 71, which is rotatably connected between the upper and lower walls of the inner cavity of the placement frame 2. A vertical groove 72 is opened on one side wall of the upper part of the threaded rod 71. A gear 74 is fitted outside the threaded rod 71. A protrusion 73 that slides within the vertical groove 72 is fixedly installed on the inner wall of the gear 74. The front part is located between two push plates 54 and meshes with teeth 55. The straightness laser measurement mechanism 8 includes a straightness measurement component 81. A cleaning component 82 is provided on the top of the straightness measurement component 81. A ring 3 83 is provided on the bottom of the straightness measurement component 81. Laser rangefinders 84 are fixedly installed on the left and right side walls of the inner cavity of the ring 3 83. The straightness measurement component 81 includes a ring 1 811. An internal thread block 812 is fixedly installed at the rear end of the ring 1 811. The internal thread block 812 is threaded and sleeved on the outside of the threaded rod 71. A slider 813 is fixedly installed at the front end of the ring 1 811. The slider 813 is slidably sleeved on the outside of the slide rod 6. Receiving boxes 814 are fixedly installed on the left and right sides of the ring 1 811. The two receiving boxes 814 contain... A measuring rod assembly 815 slides through each other. Two receiving boxes 814 each contain a spring 816 fitted over the corresponding measuring rod assembly 815. A crossbar 817 is fixedly mounted on both sides of the first ring 811, located in front of the corresponding receiving box 814. A measuring frame assembly 818 is positioned between each measuring rod assembly 815 and the adjacent crossbar 817. Two contact block assemblies 819 are fitted over the outside of each crossbar 817, symmetrically distributed on the left and right sides of the adjacent measuring frame assembly 818. A marking line 8110 is located on the top right side of the crossbar 817. Several scales 8111 are located on the top of the crossbar 817 and on both sides of the marking line 8110. The measuring rod assembly 815 includes a measuring rod 8151.One end of the measuring rod 8151 slides through the interior of the ring 811 and is fixedly fitted with a conical head 8153. The other end of the measuring rod 8151 slides through the exterior of the receiving box 814. A push plate 8152 is fixedly fitted onto the exterior of the measuring rod 8151. The push plate 8152 is slidably disposed between the inner walls of the receiving box 814. Several graduations 8154 are evenly distributed on the top of the measuring rod 8151 between the push plate 8152 and the conical head 8153. A spring 816 is fitted onto the exterior of the measuring rod 8151 and is located on the side of the push plate 8152 away from the ring 811. (Measuring frame assembly) 818 includes a collar 8181, which is slidably fitted onto the outside of the measuring rod 8151. A bolt 8182 is threaded through the top of the collar 8181. Support rods 8183 are fixedly installed at the upper and lower ends of the front end of the collar 8181. A pointer 8184 is fixedly installed at the middle of the front end of the upper support rod 8183, with the bottom of the pointer 8184 contacting the top of the crossbar 817. Frames 8185 are fixedly installed between the left and right front ends of the two support rods 8183, and both frames 8185 are slidably fitted onto the outside of the crossbar 817. The two frames 8185 are mutually... On the opposite side, a ring of recessed grooves is formed, and a ring of contact pieces 8186 is fixedly installed on the recessed grooves. Each contact block assembly 819 includes a sleeve 8191, which is slidably fitted onto the outside of the crossbar 817. A bolt 8192 is threaded through the top of the sleeve 8191. A contact block 8193 is fixedly installed on the side of the sleeve 8191 closest to the frame 8185. A ring of contact pieces 8194 is fixedly installed around the outer wall of the contact block 8193. The contact block 8193 is adapted to the recessed groove. When the contact piece 8194 contacts the adjacent contact piece 8186, an electrical connection is formed. The cleaning component 82 includes... The ring includes a second ring 821, the bottom left and right sides of which are fixedly connected to the top of the corresponding receiving box 814. Both sides of the second ring 821 are threaded with lead screws 822. At the ends of the two lead screws 822 that are close to each other, arc-shaped plates 823 are rotatably mounted. At the ends of the two arc-shaped plates 823 that are close to each other, sponge wipers 824 are attached via adhesive clips. At the ends of the two arc-shaped plates 823 that are far apart from each other, thin rods 825 are fixedly mounted at both ends. The thin rods 825 slide through the second ring 821. The top left and right sides of the third ring 83 are fixedly connected to the bottom of the corresponding receiving box 814.

[0027] Through the mutual cooperation of the push plate 54, teeth 55, gear 74, protrusion 73, vertical groove 72, and straightness laser measuring mechanism 8, driven by a servo motor 52, not only can the steel pipe be rotated, but the threaded rod 71 can also be driven to rotate intermittently. This causes the internal thread block 812 to move along the threaded rod 71 in the vertical direction, ultimately enabling the straightness laser measuring mechanism 8 to move intermittently along the steel pipe axially. This eliminates the need for a separate drive device, improving energy efficiency. Through the mutual cooperation of the ring 811, measuring rod assembly 815, spring 816, measuring frame assembly 818, contact block assembly 819, and laser rangefinder 84, two laser rangefinders 84 emit laser beams perpendicular to the steel pipe axis to monitor the radial distance difference between the left and right sides in real time. When the difference exceeds the tolerance, an alarm 10 is triggered, achieving non-contact rapid detection. The measuring rod assembly 815 drives the conical head through the spring 816. The 8153 is attached to the surface of the steel pipe, and in conjunction with the scale 8111 on the crossbar 817 and the contact block assembly 819, the allowable deviation range of straightness is set. When the radial displacement of the conical head 8153 exceeds the threshold, the contact piece 8186 and the contact piece 8194 make contact to form an electrical connection, triggering the alarm 10 to alarm, realizing contact-type precision measurement. It integrates laser measurement technology with contact measurement technology to form dual verification and ensure the reliability of the straightness measurement results. Through the cooperation between the ring 821, the lead screw 822 and the sponge 824, the sponge 824 can automatically wipe the outer wall of the steel pipe before measurement, effectively removing oil stains, dust and other attachments generated by hot rolling, avoiding the interference of impurities on the steel pipe surface on laser ranging and contact measurement. The sponge 824 can be quickly replaced with adhesive clips to ensure long-term cleaning effect. The lead screw 822 can adjust the position of the arc plate 823 and the sponge 824 to adapt to steel pipes of different diameters and improve the versatility of the equipment.

[0028] This invention also provides a method for measuring the straightness of steel pipes based on the hot rolling process of seamless steel pipes. The specific method includes the following steps: Step 1: Pull the two measuring rod assemblies 815 to the side furthest from each other, compressing the spring 816, allowing the hot-rolled seamless steel pipe to be measured to pass through the straightness laser measuring mechanism 8 and be placed on top of the base 41. During the process, observe the scale 43 in each direction, ensuring that the bottom of the steel pipe is at the center of the base 41 and in contact with each anti-slip pad 44. Then, activate the electric telescopic rod 3 to push the drive mechanism 5 downward. During the downward movement of the drive mechanism 5, the top seat assembly 56 gradually engages with the base mechanism 4. The steel pipe is vertically and stably clamped, while gear 74 moves vertically along with push plate 54. At this time, electric telescopic rod 3 stops working. Then, straightness laser measuring mechanism 8 is adjusted. During the process, since the steel pipe is located between the center of base 41 and top seat assembly 56, that is, the steel pipe also passes through the internal center of ring one 811, ring two 821 and ring three 83, under the elastic action of spring 816, the two measuring rod assemblies 815 approach each other, and the conical head 8153 is always in contact with the outer wall of the steel pipe. At this point, the two measuring rods 8151 penetrate into the ring 811 by the same distance. Then, push the collar 8181 along the measuring rod 8151 to make the pointer 8184 point to the mark line 8110. Then, tighten the bolt 8182 so that its bottom is in close contact with the top of the measuring rod 8151, locking the collar 8181 onto the measuring rod 8151. That is, the contact piece 8186 is adjusted to the initial position of the crossbar 817. Then, adjust the position of each contact block assembly 819, observe the scale 8111, and slide the contact block 8193. Once the position is set, tighten bolt 8192 to make its bottom contact tightly with the top of crossbar 817, locking the position of contact block 8193, i.e., locking the position of contact piece 8194. At this time, the distance between contact piece 8186 and the adjacent contact piece 8194 is the maximum allowable deviation limit of the straightness of the steel pipe. Then tighten screw 822 to push arc plate 823 towards the side closer to the steel pipe. Thin rod 825 slides along the inside of ring 821, finally making sponge 824 contact the outer wall of the steel pipe. Step 2: Start the servo motor 52 to drive the wheel column 53, teeth 55, and top seat assembly 56 to rotate. Utilizing the friction between the anti-slip pad 44 and the steel pipe, as well as the friction between the top seat assembly 56 and the steel pipe, the steel pipe will rotate along with the top seat assembly 56. During the rotation of the wheel column 53 and teeth 55, teeth 55 intermittently mesh with gear 74, thereby intermittently driving the threaded rod 71 to rotate. The rotating threaded rod 71 drives the straightness laser measuring mechanism 8 to gradually move upward along the bottom of the steel pipe, causing the straightness laser measuring mechanism 8 to move circumferentially relative to the steel pipe and intermittently move along the axial direction of the steel pipe. At the same time, two laser rangefinders 84 work to measure the straightness of the steel pipe using laser measurement technology. The straightness measuring assembly 81 also works to measure the straightness of the steel pipe again. The straightness of the steel pipe is detected by a combination of non-contact and contact measurement. Before measurement, the sponge 824 wipes the outer wall of the steel pipe in time to clean the oil and dust on the surface of the steel pipe, improving the measurement accuracy. Step 3: During the straightness measurement of the steel pipe, two laser rangefinders 84 operate. The laser lines emitted by the laser rangefinders 84 are perpendicular to the central axis of the steel pipe. When the straightness of the steel pipe meets the design tolerance requirements, the difference between the two radial distances measured by the laser rangefinders 84 at the two measuring points on the left and right sides of the steel pipe is also controlled within the allowable tolerance range. When the difference between the two radial distances measured by the two laser rangefinders 84 exceeds the allowable tolerance range, the alarm 10 sounds, reminding the staff that the straightness of the steel pipe at this point does not meet the standard. This is how the laser rangefinders 84 achieve the purpose of laser measurement of the straightness of the steel pipe. The laser rangefinders 84 are existing technology known to those skilled in the art. Simultaneously, the straightness measurement component 81 operates, due to the conical head 8153 and... The outer wall of the steel pipe remains in contact. As the steel pipe rotates, under the condition that the straightness of the steel pipe meets the design tolerance requirements, the radial position of the cone head 8153 remains unchanged or changes within the allowable radial range. That is, the radial position of the contact piece 8186 remains unchanged or changes within the allowable radial range. During the process, the contact piece 8186 does not contact the adjacent contact piece 8194. When the frame 8185 moves to make the contact piece 8186 contact the adjacent contact piece 8194, the contact piece 8186 and the adjacent contact piece 8194 form an electrical connection, and the alarm 10 is powered on to sound an alarm. At this time, the deviation value of the measuring point exceeds the allowable tolerance range, reminding the staff that the straightness of the steel pipe at this point does not meet the standard. This is used to measure whether the straightness of the steel pipe meets the standard, thereby completing the straightness measurement of the steel pipe.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] 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 laser straightness measuring machine for steel pipes based on hot rolling of seamless steel pipes, comprising a machine case, characterized in that, Also include: The placement rack is fixedly arranged on the rear wall of the inner cavity of the cabinet, the top of the placement rack is fixedly provided with an electric telescopic rod, the inner cavity bottom of the placement rack is rotatably provided with a base mechanism through a short shaft, the bottom of the electric telescopic rod is slidably penetrated through the top of the placement rack and is fixedly provided with a driving mechanism, the base mechanism and the driving mechanism are matched with each other for clamping and driving the seamless steel pipe for hot rolling of the steel pipe, the inner cavity of the placement rack is fixedly arranged between the upper and lower walls of the inner cavity and is located in front of the driving mechanism, the inner cavity of the placement rack is rotatably arranged between the upper and lower walls of the inner cavity and is located behind the driving mechanism, the front end of the cabinet is rotatably provided with a sealing door, the front end bottom right of the cabinet is fixedly provided with an alarm, the front right of the cabinet is fixedly provided with a control panel, and the inner cavity bottom of the cabinet is fixedly provided with a central processing unit. The straightness laser measuring mechanism is used for measuring the straightness of the seamless steel pipe for hot rolling of the steel pipe, and is arranged between the slide rod and the threaded rod mechanism.

2. The laser straightness measurement machine based on hot rolling of seamless steel pipes according to claim 1, characterized in that: The base mechanism includes a base, a center column is fixedly arranged at the top of the base, a plurality of scales are arranged at the top of the base and on the left and right sides of the center column and the front and rear ends, four anti-skid washers are uniformly fixedly arranged at the top of the base and outside the center column, and the bottom of the base is fixedly connected with the top of the short shaft, and the bottom of the short shaft is rotatably connected to the inner cavity bottom of the placement rack.

3. The laser straightness measurement machine based on hot rolling of seamless steel pipes according to claim 1, characterized in that: The driving mechanism includes a placement box, the top of the placement box is fixedly connected with the bottom of the electric telescopic rod, the inner cavity bottom of the placement box is fixedly provided with a servo motor, the output shaft of the servo motor penetrates the bottom of the placement box and is fixedly sleeved with a wheel column, the upper and lower parts of the wheel column are fixedly provided with a push disc sleeved outside the output shaft, a plurality of teeth are uniformly fixedly arranged in one half region of the circumferential outer wall of the wheel column, the bottom of the lower push disc is fixedly provided with a top seat assembly, and the top seat assembly is the same as the base mechanism and is arranged in an upper and lower symmetrical manner.

4. The laser straightness measurement machine based on hot rolling of seamless steel pipes according to claim 3, characterized in that: The threaded rod mechanism includes a threaded rod, the threaded rod is rotatably connected between the inner cavity upper and lower walls of the placement rack, a vertical groove is formed in one side wall of the upper part of the threaded rod, a gear is sleeved outside the threaded rod, a protrusion is fixedly arranged on the inner wall of the gear and slides in the vertical groove, and the front part of the gear is located between the two push discs and is engaged with the teeth.

5. The laser straightness measurement machine based on hot rolling of seamless steel pipes according to claim 4, characterized in that: The straightness laser measuring mechanism comprises a straightness measuring assembly, the top of the straightness measuring assembly is provided with a cleaning assembly, the bottom of the straightness measuring assembly is provided with a circular ring three, the left and right side walls of the inner cavity of the circular ring three are fixedly provided with laser range finders, the straightness measuring assembly comprises a circular ring one, the rear end of the circular ring one is fixedly provided with an internal threaded block, the internal threaded block is threadedly sleeved on the outside of a threaded rod, the front end of the circular ring one is fixedly provided with a sliding block, the sliding block is slidingly sleeved on the outside of a sliding rod, the left and right sides of the circular ring one are fixedly provided with containing boxes, two measuring rod assemblies are slidingly penetrated in the containing boxes, springs sleeved on the outside of the corresponding measuring rod assemblies are arranged in the containing boxes, the left and right sides of the circular ring one are fixedly provided with cross rods in front of the corresponding containing boxes, a measuring frame assembly is arranged between each measuring rod assembly and the adjacent cross rod, two touch block assemblies are sleeved on the outside of each cross rod, the two touch block assemblies are symmetrically arranged on the left and right sides of the adjacent measuring frame assembly, a mark line is arranged on the top right side of the cross rod, a plurality of second scales are arranged on the top of the cross rod and on the two sides of the mark line.

6. The laser straightness measurement machine based on hot rolling of seamless steel pipes according to claim 5, characterized in that: The measuring rod assembly comprises a measuring rod, one end of the measuring rod is slidingly penetrated into the inside of the circular ring one and is fixedly provided with a conical head, the other end of the measuring rod is slidingly penetrated into the outside of the containing box, a push plate is fixedly sleeved on the outside of the measuring rod, the push plate is slidingly arranged between the inner walls of the containing box, a plurality of third scales are uniformly arranged on the top of the measuring rod and between the push plate and the conical head, the spring is sleeved on the outside of the measuring rod and is located on the side, away from the circular ring one, of the push plate.

7. The laser straightness measurement machine based on hot rolling of seamless steel pipes according to claim 6, characterized in that: The measuring frame assembly comprises a sleeve ring, the sleeve ring is slidingly sleeved on the outside of the measuring rod, a first bolt is threadedly penetrated into the top of the sleeve ring, frame rods are fixedly arranged on the upper and lower parts of the front end of the sleeve ring, a pointer is fixedly arranged on the front end of the upper frame rod, the bottom of the pointer is in contact with the top of the cross rod, frame bodies are fixedly arranged between the left front ends and the right front ends of the two frame rods, the two frame bodies are slidingly sleeved on the outside of the cross rod, a circle of embedded grooves are formed on the sides, away from each other, of the two frame bodies, and a circle of touch pads one are fixedly arranged on the embedded grooves.

8. The laser straightness measurement machine based on hot rolling of seamless steel pipes according to claim 7, characterized in that: Each touch block assembly comprises a sleeve frame, the sleeve frame is slidingly sleeved on the outside of the cross rod, a second bolt is threadedly penetrated into the top of the sleeve frame, a touch block is fixedly arranged on the side, close to the frame body, of the sleeve frame, a circle of touch pads two are fixedly arranged on the outer wall of the touch block, the touch block is matched with the embedded groove, and the touch pads two are in electrical connection with the adjacent touch pads one when the touch pads two are in contact with the adjacent touch pads one.

9. The seamless steel tube hot rolling process based straightness laser measuring machine according to claim 5, characterized in that: The cleaning assembly includes two circular rings, the bottom of the two circular rings is fixedly connected with the top of the corresponding containing box on the left and right sides respectively, the left and right sides of the two circular rings are threaded through with a lead screw, the end of the two lead screws close to each other is rotatably provided with an arc-shaped plate, the side close to each other of the two arc-shaped plates is provided with a sponge wipe through the pasting buckle, the front and rear ends of the side away from each other of the two arc-shaped plates are fixedly provided with a thin rod, the thin rod is slidably penetrated through the circular ring two, and the top of the circular ring three is fixedly connected with the bottom of the corresponding containing box on the left and right sides respectively.

10. Method for measuring the straightness of a steel tube based on hot rolling of seamless steel tubes, characterized in that: The method comprises the following steps: Step one, the seamless steel pipe hot rolling processing steel pipe to be measured is penetrated through the straightness laser measuring mechanism, and is placed on the top center position of the base mechanism, then the electric telescopic rod driving driving mechanism is started to move down, the driving mechanism is gradually matched with the base mechanism during moving down, the steel pipe is stably clamped and fixed, at this time the electric telescopic rod is temporarily stopped, then the straightness laser measuring mechanism is adjusted, so that the straightness laser measuring mechanism is in contact with the outer wall of the steel pipe; Step two, the driving mechanism is started, and the base mechanism is cooperated to drive the steel pipe to rotate, at the same time, the straightness laser measuring mechanism works, the straightness of the rotating steel pipe is measured, the driving mechanism works intermittently to drive the threaded rod mechanism to rotate, so that the straightness laser measuring mechanism is intermittently moved up along the bottom of the steel pipe, the straightness laser measuring mechanism is moved relative to the steel pipe in the circumferential direction, and is intermittently moved in the axial direction of the steel pipe; Step three, during the movement of the straightness laser measuring mechanism, not only the straightness of the steel pipe is measured by using the laser measurement technology, but also the deviation value of the measurement point on the steel pipe is detected by the mechanical method, when the deviation value of the measurement point exceeds the tolerance allowed range, the alarm is alarmed, so as to measure whether the straightness of the steel pipe meets the standard, so as to complete the straightness measurement of the steel pipe.

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