A seamless steel pipe fixed-length cutting device

Abstract

The application discloses a seamless steel pipe fixed-length cutting device and relates to the technical field of seamless steel pipe processing; specifically comprises a driving main shaft box provided with a three-jaw chuck; the three-jaw chuck automatically clamps a seamless steel pipe; one side of the three-jaw chuck is provided with a laser cutter capable of automatically adjusting height according to the outer diameter of the seamless steel pipe; one side of the laser cutter is provided with a steel pipe fixed-length assembly; and a mounting connecting seat is fixedly installed on one side of the laser cutter. In terms of fixed-length precision, the adjusting cylinder is directly given stroke by an industrial computer, so that the fixed-length value is digitally set; the distance measuring sensor two moves synchronously with the mounting seat cylinder, and the actual displacement of the limiting baffle is fed back in real time and corrected by the industrial computer; the pressure detection sensor abuts against the rotating baffle at the end of the steel pipe, and only when the pressure reaches the preset value, it is determined that the position is reached and the three-jaw chuck is clamped; the three links of setting, feedback and determination form a closed loop, and the fixed-length precision and cutting precision of the seamless steel pipe are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of seamless steel pipe processing technology, and in particular to a seamless steel pipe fixed-length cutting device. Background Technology

[0002] Seamless steel pipe is a long strip of steel with a hollow cross-section and no seams around its perimeter. It is an economical cross-section steel material and is widely used in industrial fields. Laser-cutting of seamless steel pipe is currently a processing solution that offers both high precision and efficiency in the industrial sector.

[0003] A search revealed Chinese patent application number 202521920179.2, which discloses a metal pipe positioning and cutting device. This device uses a sliding movable plate to adjust the distance between the plate and the cutting blade, thus adjusting the length of the cutting segment. This allows for quantitative cutting of metal pipes. A positioning frame presses down on the metal pipe during cutting, and combined with the conveying and positioning of the drive and driven wheels, the metal pipe is securely fixed, preventing deviation during cutting. The inclined cutting table allows the cut metal pipe to roll off the cutting table after the positioning frame is released, achieving automatic unloading.

[0004] The metal pipe positioning and cutting equipment in the aforementioned patent has the following shortcomings: the device cuts seamless steel pipes using a cutting blade. In the actual cutting process, the cutting length of the steel pipe is mainly determined by moving a plate. This simple mechanical structure has a relatively large deviation in the process of determining the length of the steel pipe, which affects the accuracy of the cutting length of the steel pipe. Summary of the Invention

[0005] This invention proposes a seamless steel pipe length-cutting device to solve the problems of existing metal pipe positioning and cutting equipment that rely on mechanical limiting of a moving plate to determine the cutting length of the steel pipe, resulting in large length deviations; the use of contact cutting with a cutting disc, which easily causes the steel pipe to deviate due to the cutting force and the wear of the cutting tool, leading to dimensional drift; the lack of an automatic centering structure when feeding steel pipes of different outer diameters, which easily causes eccentric rotation and cut deviation; the lack of follow-up support for the fixed-length section of the steel pipe during the cutting process, which easily causes sagging and shaking; and the need to readjust the focus point of the laser cutter when changing the steel pipe specifications, resulting in insufficient overall automation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A seamless steel pipe length-cutting device includes a drive spindle box equipped with a three-jaw chuck. The three-jaw chuck automatically clamps the seamless steel pipe. A laser cutter with automatically adjustable height based on the outer diameter of the seamless steel pipe is mounted on one side of the chuck. A steel pipe length-cutting component is mounted on one side of the laser cutter. An installation connecting seat is fixedly mounted on one side of the laser cutter. A lifting cylinder is fixedly mounted on the top of the installation connecting seat, and a distance measuring sensor for measuring the descent height of the laser cutter is fixedly mounted on one side of the installation connecting seat. The main body of the steel pipe length-cutting component is a limiting seat frame. An adjusting cylinder coaxial with the three-jaw chuck is fixedly mounted on the upper part of one side of the limiting seat frame. An installation cylinder is fixedly mounted at the telescopic end of the adjusting cylinder. A limiting baffle for limiting the end of the seamless steel pipe is fixedly mounted inside the installation cylinder. A pressure detection sensor for detecting the force exerted by the seamless steel pipe on the limiting baffle is mounted on one side of the limiting baffle, and a distance measuring sensor that moves synchronously with the installation cylinder is mounted on one side of the installation cylinder.

[0007] As a preferred embodiment of the present invention, the laser path of the laser cutter is perpendicular to the axis of the three-jaw chuck, and the laser cutter moves in a straight line along the laser path, with the distance between the laser emission point of the laser cutter and the outer wall of the seamless steel pipe being fixed.

[0008] As a preferred embodiment of the present invention: a cutting bracket is provided on one side of the three-jaw chuck, the lifting cylinder is fixedly installed on the upper part of the cutting bracket, a clamping guide rail is fixedly installed on the side of the cutting bracket near the three-jaw chuck, a slidable clamping bracket is engaged on the clamping guide rail, and the slidable clamping bracket is fixedly installed at the bottom end of the mounting connector.

[0009] Based on the aforementioned scheme: a mounting arm is fixedly installed on one side of the cutting bracket. The mounting arm is divided into two integrally formed upper and lower parts. The upper part is set as a horizontal section, and a reflector that cooperates with a distance sensor is fixedly installed at the top of the horizontal section. The lower part is set as a vertical section, and a reflector that cooperates with a distance sensor is fixedly installed on one side of the vertical section.

[0010] As a preferred embodiment of the present invention: a rotating groove is provided on the side of the limiting baffle near the three-jaw chuck, a mating bearing is fixedly installed inside the rotating groove, a rotating baffle is fixedly installed inside the mating bearing, and multiple stabilizing slide rods that are slidably connected to the limiting seat frame are fixedly installed at equal intervals on one side of the mounting base.

[0011] As a preferred embodiment of the present invention: a bearing hydraulic cylinder is provided between the laser cutter and the mounting cylinder, a bearing seat plate is fixedly installed on the top of the telescopic end of the bearing hydraulic cylinder, and two parallel bearing seat rollers are rotatably installed on the upper surface of the bearing seat plate, the axis of the bearing seat rollers being parallel to the axis of the three-jaw chuck.

[0012] As a preferred embodiment of the present invention: a steel pipe feeding assembly is provided on the other side of the drive spindle box. The steel pipe feeding assembly includes two feeding units. The main body of the feeding unit is configured as multiple rotating bearing rollers arranged at equal intervals. The two sets of rotating bearing rollers are staggered and tilted in opposite directions. The included angle is adjusted according to the outer diameter of the seamless steel pipe, so that the seamless steel pipes carried by the two sets of rotating bearing rollers are coaxial with the three-jaw chuck.

[0013] Based on the aforementioned scheme: the bottom end of the rotating bearing rollers in the same group is rotatably connected to a rotating connecting arm, and the rotating connecting arm is rotatably connected to a fixed rotating connecting seat.

[0014] Based on the aforementioned scheme: an adjusting connecting arm is rotatably connected to the top of the same group of rotating bearing rollers, and a servo motor is fixedly installed at one end of the adjusting connecting arm. The servo motor drives the rotating bearing roller located at the end of the adjusting connecting arm, and the two servo motors are respectively located at both ends of the steel pipe feeding assembly.

[0015] Based on the aforementioned scheme: multiple adjusting connecting seats are fixedly connected at equal intervals on one side of the adjusting connecting arm; an adjusting connecting head is rotatably installed inside the adjusting connecting seat; an adjusting hydraulic cylinder is fixedly connected to the adjusting connecting head; and a hydraulic cylinder rotating seat is rotatably connected to the bottom end of the adjusting hydraulic cylinder; the linkage of the two sets of adjusting hydraulic cylinders allows them to extend and retract synchronously, causing the two sets of rotating bearing rollers to deflect synchronously.

[0016] The beneficial effects of this invention are as follows: 1. In terms of length accuracy, the adjusting cylinder's stroke is directly given by an industrial computer, making the length setting digital; the second distance sensor moves synchronously with the mounting base, providing real-time feedback on the actual displacement of the limit baffle, which is then corrected by the industrial computer; the pressure detection sensor determines the position and controls the three-jaw chuck to clamp the pipe only after the pressure reaches the preset value and the end of the pipe is pressed against the rotating baffle; the setting, feedback, and determination processes form a closed loop, significantly improving the length accuracy and cutting accuracy of the seamless steel pipe.

[0017] 2. In terms of specification adaptability, this seamless steel pipe fixed-length cutting device uses a lifting cylinder to drive the laser cutter to move along the laser path, keeping the distance between the laser emission point and the outer wall of steel pipes with different outer diameters constant. When changing specifications, only the power needs to be adjusted according to the wall thickness, without the need for refocusing. The distance sensor and reflector monitor the descent height, and the lifting cylinder is compensated by the industrial computer when deviation occurs. The stabilizing frame and frame guide rail ensure that there is no deviation during the lifting process, and the laser path always intersects perpendicularly with the axis of the three-jaw chuck.

[0018] 3. In terms of feeding and centering, the seamless steel pipe fixed-length cutting device uses two sets of staggered and oppositely inclined rotating bearing rollers that are synchronously driven by adjusting hydraulic cylinders to adjust the included angle, so that the axis of steel pipes with different outer diameters automatically coincides with the axis of the three-jaw chuck, avoiding the skew of the cut caused by eccentric rotation; two servo motors are set at both ends to synchronously drive the feeding, and the process is smooth; the three-jaw chuck is coaxially installed at the end of the thick-walled cylinder shaft, which facilitates the direct introduction of steel pipes.

[0019] 4. In terms of cutting stability, the seamless steel pipe fixed-length cutting device uses a bearing hydraulic cylinder to lift the bearing seat plate according to the outer diameter of the steel pipe, and two bearing seat rollers to support the fixed-length section of the steel pipe to prevent sagging and shaking during cutting; the bearing component and the fixed-length component do not interfere with each other and can be arranged independently; the limit baffle is set with a rotating baffle through a matching bearing, which rotates synchronously with the steel pipe, which does not affect the pressure detection and avoids end face friction and additional axial force from interfering with the fixed-length reference.

[0020] 5. In terms of automation, this seamless steel pipe fixed-length cutting device uses an industrial computer to uniformly control the entire process of fixed-length setting, cutter height adjustment, material feeding and centering, positioning judgment, chuck clamping, load support and rotary cutting based on the input inner diameter, outer diameter, total length and fixed-length cutting length of the steel pipe. No manual operation is required, eliminating the differences caused by human operation and improving processing efficiency and product consistency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall assembly of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall assembly of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall assembly of the present invention. Figure 3 ; Figure 4 This is a partial cross-sectional view of the overall assembly of the present invention. Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at point A in the middle.

[0022] In the diagram: 1. Mounting base; 2. Drive spindle box; 3. Three-jaw chuck; 4. Cutting bracket; 5. Lifting cylinder; 6. Mounting connector; 7. Laser cutter; 8. Range sensor one; 9. Stabilizing frame; 10. Frame guide rail; 11. Mounting arm; 12. Reflector one; 13. Reflector two; 14. Bearing hydraulic cylinder; 15. Bearing seat plate; 16. Bearing seat roller; 17. Limiting seat; 18. Adjusting cylinder; 19. Mounting sleeve 20. Stabilizing slide bar; 21. Rotating connecting seat; 22. Rotating connecting arm; 23. Rotating bearing roller; 24. Adjusting connecting arm; 25. Servo motor; 26. Motor bracket; 27. Adjusting connecting seat; 28. Adjusting connecting head; 29. ​​Adjusting hydraulic cylinder; 30. Hydraulic cylinder rotating seat; 31. Sensor holder; 32. Distance sensor II; 33. Limit baffle; 34. Matching bearing; 35. Rotating baffle; 36. Pressure detection sensor. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] A seamless steel pipe fixed-length cutting device, such as Figures 1 to 5 As shown, the device includes a drive spindle box 2 equipped with a three-jaw chuck 3. The three-jaw chuck 3 automatically clamps the seamless steel pipe. On one side of the chuck 3 is a laser cutter 7 that automatically adjusts its height according to the outer diameter of the seamless steel pipe. On one side of the laser cutter 7 is a steel pipe length-fixing component, and on the other side is a steel pipe feeding component that quickly adjusts the position of the seamless steel pipe according to its outer diameter so that the axis of the seamless steel pipe coincides with the axis of the three-jaw chuck 3. The drive spindle box 2, the steel pipe feeding component, and the steel pipe length-fixing component are all fixedly installed on the mounting base 1. The laser cutter 7 is installed on the mounting base 1 through a bracket structure and is equipped with a bearing component for carrying the cut steel pipe segments. The bearing component is fixedly installed on the mounting base 1 and does not interfere with the steel pipe length-fixing component.

[0026] The drive spindle box 2 can adopt the existing spindle box structure of CNC machine tools. The difference is that the output shaft is replaced with a thick-walled cylindrical shaft. The three-jaw chuck 3 is fixedly installed at the end of the thick-walled cylindrical shaft in a coaxial form, which facilitates the steel pipe feeding assembly to guide the seamless steel pipe into the three-jaw chuck 3.

[0027] The overall cutting device is equipped with an industrial computer, which has a built-in program to control the overall device. The three-jaw chuck 3 is an automatically controlled model that does not require manual operation. The industrial computer automatically clamps the seamless steel pipe after it has been cut to a fixed length, based on the input outer diameter data of the seamless steel pipe. It then drives the spindle box 2 to rotate the seamless steel pipe through the three-jaw chuck 3, and works with the laser cutter 7 to perform fixed-length cutting of the seamless steel pipe.

[0028] Example 1: A cutting bracket 4 is provided on one side of the three-jaw chuck 3. A lifting cylinder 5 is fixedly installed on the top of the cutting bracket 4 near the three-jaw chuck 3. A mounting connector 6 is fixedly installed at the bottom of the telescopic end of the lifting cylinder 5. The laser cutter 7 is fixedly installed on the side of the mounting connector 6 near the three-jaw chuck 3.

[0029] The laser path of the laser cutter 7 is perpendicular to the axis of the three-jaw chuck 3, and the lifting cylinder 5 controls the laser cutter 7 to move linearly along the laser path through the mounting connector 6, adjusting the distance between the laser cutter 7 and the seamless steel pipe, so that the distance between the laser emission point of the laser cutter 7 and the outer wall of the seamless steel pipe with different outer diameters is fixed.

[0030] This configuration allows the laser cutter 7 to adjust the laser power only according to the wall thickness of the seamless steel pipe when cutting seamless steel pipes of different sizes, eliminating the need to adjust the focal point of the laser cutter 7 and reducing the adjustment difficulty of the laser cutter 7 during operation.

[0031] The main body of the cutting bracket 4 is set as a vertical column. A mounting base plate is welded to the bottom of the column, and a reinforcing rib is welded between the mounting base plate and the column. A bracket guide rail 10 is fixedly installed on the side of the column near the three-jaw chuck 3. The bottom end of the bracket guide rail 10 rests on the reinforcing rib, and a stabilizing bracket 9 is slidably engaged on the bracket guide rail 10. The stabilizing bracket 9 is fixedly installed at the bottom of the mounting connection seat 6.

[0032] The mounting connector 6 is attached to the bracket guide rail 10. The stable cooperation between the bracket 9 and the bracket guide rail 10 ensures that the laser cutter 7 remains sufficiently stable during displacement and will not deviate, ensuring that the straight line of the laser path always intersects with the axis of the three-jaw chuck 3.

[0033] A distance measuring sensor 8 for measuring the descent height of the laser cutter 7 is fixedly installed on one side of the mounting connector 6; a mounting arm 11 is fixedly installed on one side of the reinforcing rib. The mounting arm 11 is divided into two integrally formed upper and lower parts. The upper part is set as a horizontal section, and a reflector 12 that cooperates with the distance measuring sensor 8 is fixedly installed at the top of the horizontal section. The lower part is set as a vertical section, and a reflector 2 13 is fixedly installed on some parts of the vertical section.

[0034] The lifting cylinder 5 is selected as a model with controllable stroke and is directly controlled by the industrial computer; the distance sensor 8 feeds back the displacement data of the laser cutter 7 to the industrial computer as an auxiliary monitoring means. When there is a difference between the data fed back by the distance sensor 8 and the preset value of the industrial computer, the industrial computer controls the lifting cylinder 5 to perform displacement compensation, so as to ensure the accuracy of the distance between the laser cutter 7 and the seamless steel pipe, thereby ensuring the cutting accuracy of the laser cutter 7 on the seamless steel pipe.

[0035] The main body of the steel pipe length-fixing assembly is a limiting seat 17. An adjusting cylinder 18 is fixedly installed on the upper part of the limiting seat 17 away from the three-jaw chuck 3. The telescopic end of the adjusting cylinder 18 passes through the limiting seat 17, and an installation sleeve 19 is fixedly installed at the end of the telescopic end. Multiple stabilizing slide rods 20 are fixedly installed at equal intervals on the side of the installation sleeve 19 close to the limiting seat 17. The outer wall of the stabilizing slide rod 20 is sleeved with a stabilizing sleeve through a linear bearing. The stabilizing sleeve is fixedly connected to the limiting seat 17. The installation sleeve 19 is coaxial with the three-jaw chuck 3 and coaxial with the telescopic end of the adjusting cylinder 18.

[0036] A limiting baffle 33 for limiting the end of the seamless steel pipe is fixedly installed inside the mounting base 19. The limiting baffle 33 and the side of the mounting base 19 near the three-jaw chuck 3 are in the same plane, and a pressure detection sensor 36 installed inside the mounting base 19 is provided on the other side of the limiting baffle 33.

[0037] The pressure sensor 36 is used to detect the force exerted by the seamless steel pipe on the limit baffle 33 and feeds the detection data back to the industrial computer. When the detection data of the pressure sensor 36 reaches the preset value (generally set to 20 Newtons), the industrial computer determines that the extension length of the seamless steel pipe has reached the preset cutting length and controls the three-jaw chuck 3 to clamp the seamless steel pipe.

[0038] A sensor holder 31 is fixedly installed on one side of the mounting base 19. A second distance sensor 32 that moves synchronously with the mounting base 19 is fixedly installed inside the sensor holder 31. The second distance sensor 32 cooperates with the second reflector 13 to measure the displacement value of the limit baffle 33.

[0039] The adjusting cylinder 18 is selected as a model with controllable stroke and is directly controlled by an industrial computer; the distance measuring sensor 32 serves as an auxiliary to detect the extension length of the adjusting cylinder 18, and in conjunction with determining the actual displacement value of the limit baffle 33, accurately control the cutting length of the seamless steel pipe.

[0040] The limiting baffle 33 has a rotating groove on the side near the three-jaw chuck 3. A mating bearing 34 is fixedly installed inside the rotating groove, and a rotating baffle 35 is fixedly installed inside the mating bearing 34. The rotating baffle 35 is in direct contact with the seamless steel pipe. The setting of the rotating baffle 35 does not affect the data detection of the pressure detection sensor 36. At the same time, it works with the three-jaw chuck 3 to drive the seamless steel pipe to rotate, which facilitates the laser cutter 7 to cut the seamless steel pipe.

[0041] A bearing hydraulic cylinder 14 is provided between the laser cutter 7 and the mounting base 19. The bearing hydraulic cylinder 14 is fixed on the mounting base 1, and a bearing seat plate 15 is fixedly installed on the top of the telescopic end of the bearing hydraulic cylinder 14. Two parallel bearing seat rollers 16 are rotatably installed on the upper surface of the bearing seat plate 15. The axis of the bearing seat rollers 16 is parallel to the axis of the three-jaw chuck 3. The two bearing seat rollers 16 support a fixed length section of the seamless steel pipe to ensure the stability of the seamless steel pipe during the cutting process.

[0042] In this embodiment, the dimensions of the seamless steel pipe, such as inner diameter, outer diameter, total length, and fixed-length cutting length, are first input into the industrial computer. The industrial computer determines the cutting parameters of the laser cutter 7 based on the data of the seamless steel pipe, and adjusts the position of the mounting cylinder 19 by adjusting the cylinder 18, so that the displacement data detected by the distance measuring sensor 2 32 matches the fixed-length cutting length of the seamless steel pipe. Then, the position of the laser cutter 7 is adjusted by the lifting cylinder 5. Next, the seamless steel pipe is fed by the steel pipe feeding assembly. When the force of the seamless steel pipe on the rotating baffle 35 reaches 20 Newtons, the industrial computer controls the three-jaw chuck 3 to clamp the seamless steel pipe, and controls the bearing hydraulic cylinder 14 to lift the bearing seat plate 15 according to the outer diameter of the steel pipe, so that the two bearing seat rollers 16 stably support the fixed-length section of the seamless steel pipe. Finally, the seamless steel pipe is rotated by driving the spindle box 2, and the seamless steel pipe is cut in conjunction with the laser cutter 7.

[0043] Example 2: Based on Example 1, the steel pipe length-fixed component is optimized.

[0044] In Embodiment 1, the limiting baffle 33 is coaxially arranged with the three-jaw chuck 3 to restrict the end face of the seamless steel pipe in all directions. This design limits the length of the bearing seat roller 16, that is, limits the bearing capacity of the bearing seat roller 16 on the seamless steel pipe.

[0045] Based on this, the height of the limiting baffle 33 is adjusted so that the bottom of the limiting baffle 33 coincides with the axis of the three-jaw chuck 3. The limiting baffle 33 only serves to fix the length of the seamless steel pipe and does not rotate with the seamless steel pipe.

[0046] Based on the optimization of the fixed-length steel pipe assembly, the bearing roller 16 can be further optimized. A micro motor can be added to the lower surface of the bearing plate 15 to drive one of the bearing rollers 16 to rotate, so that the linear velocity of the outer wall of the bearing roller 16 is the same as the linear velocity of the outer wall of the seamless steel pipe when it rotates. This ensures that the parts on both sides of the seamless steel pipe cutting seam rotate synchronously, improving the cutting effect of the laser cutter 7 on the seamless steel pipe. At the same time, the length of the bearing roller 16 is increased to adapt to different lengths of the fixed-length seamless steel pipe, ensuring the load-bearing capacity of the fixed-length seamless steel pipe.

[0047] Example 3: Based on Examples 1 and 2, the existing steel pipe feeding assembly is optimized to effectively combine the steel pipe feeding assembly with laser cutting, further improving the cutting effect of seamless steel pipes. The steel pipe feeding assembly includes two symmetrically arranged feeding units (unit one and unit two, respectively). The main body of the feeding unit is composed of multiple equidistant rotating bearing rollers 23. The two sets of rotating bearing rollers 23 are staggered and tilted in opposite directions. The included angle is adjusted according to the outer diameter of the seamless steel pipe so that the seamless steel pipe carried by the two sets of rotating bearing rollers 23 is coaxial with the three-jaw chuck 3.

[0048] The bottom end of the same set of rotating bearing rollers 23 is rotatably connected to a rotating connecting arm 22, and the rotating connecting arm 22 is rotatably connected to a fixed rotating connecting seat 21. The rotating connecting seat 21 is fixedly installed on the mounting base 1, and the two rotating connecting seats 21 are symmetrically arranged with the vertical plane where the axis of the three-jaw chuck 3 is located as the symmetrical face.

[0049] An adjusting connecting arm 24 is rotatably connected to the top of the rotating bearing roller 23 of the same group. The adjusting connecting arm 24 of the first unit is located above the rotating connecting arm 22 of the second unit, and the adjusting connecting arm 24 of the second unit is located above the rotating connecting arm 22 of the first unit.

[0050] The projections of the two adjusting connecting arms 24 and the two rotating connecting arms 22 on the horizontal plane are arranged as follows: the two rotating connecting arms 22 are positioned between the two adjusting connecting arms 24; the rotating connecting arm 22 of unit 1 is positioned between the rotating connecting arm 22 and the adjusting connecting arm 24 of unit 2; and the rotating connecting arm 22 of unit 2 is positioned between the rotating connecting arm 22 and the adjusting connecting arm 24 of unit 1.

[0051] A motor bracket 26 is fixedly installed at one end of the adjusting connecting arm 24. A servo motor 25 is fixedly installed inside the motor bracket 26. The servo motor 25 drives the rotating bearing roller 23 located at the end of the adjusting connecting arm 24 and is controlled by an industrial computer. The two servo motors 25 are respectively located at both ends of the steel pipe feeding assembly.

[0052] Multiple adjusting connecting seats 27 are fixedly connected at equal intervals on one side of the adjusting connecting arm 24. An adjusting connecting head 28 is rotatably installed inside the adjusting connecting seat 27. An adjusting hydraulic cylinder 29 is fixedly connected to the adjusting connecting head 28. A hydraulic cylinder rotating seat 30 is rotatably connected to the bottom end of the adjusting hydraulic cylinder 29. The hydraulic cylinder rotating seat 30 is fixedly installed on the mounting base 1. The linkage and synchronous extension and retraction of the two sets of adjusting hydraulic cylinders 29 are directly controlled by an industrial computer, so that the two sets of rotating bearing rollers 23 deflect synchronously.

[0053] Based on Embodiments 1 and 2, in this embodiment, the industrial computer controls the synchronous extension and retraction of the adjusting hydraulic cylinders 29 of the two sets of feeding units according to the outer diameter of the seamless steel pipe, and adjusts the included angle of the two sets of rotating bearing rollers 23 so that the axis of the seamless steel pipe carried by the two sets of rotating bearing rollers 23 coincides with the axis of the three-jaw chuck 3; the industrial computer controls the two servo motors 25 to rotate synchronously, and drives the seamless steel pipe into the three-jaw chuck 3 through the rotating bearing rollers 23 and abuts against the rotating baffle 35. When the pressure value fed back to the industrial computer by the pressure detection sensor 36 is greater than or equal to 20 Newtons, the industrial computer controls the three-jaw chuck 3 to clamp the seamless steel pipe and shuts off the servo motors 25.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A seamless steel pipe length-cutting device, comprising a drive spindle box (2) equipped with a three-jaw chuck (3), the three-jaw chuck (3) automatically clamping the seamless steel pipe, a laser cutter (7) with automatically adjustable height according to the outer diameter of the seamless steel pipe being provided on one side, and a steel pipe length-cutting component being provided on one side of the laser cutter (7), characterized in that: A mounting bracket (6) is fixedly installed on one side of the laser cutter (7). A lifting cylinder (5) is fixedly installed on the top of the mounting bracket (6). A distance measuring sensor (8) for measuring the descent height of the laser cutter (7) is fixedly installed on one side of the mounting bracket (6). The main body of the steel pipe length-fixing assembly is set as a limiting seat (17). An adjusting cylinder (18) coaxial with the three-jaw chuck (3) is fixedly installed on the upper part of one side of the limiting seat (17). A mounting sleeve (19) is fixedly installed at the telescopic end of the adjusting cylinder (18). A limiting baffle (33) for limiting the end of the seamless steel pipe is fixedly installed inside the mounting sleeve (19). A pressure detection sensor (36) for detecting the force of the seamless steel pipe on the limiting baffle (33) is set on one side of the limiting baffle (33). A distance measuring sensor (32) that moves synchronously with the mounting sleeve (19) is set on one side of the mounting sleeve (19).

2. The seamless steel pipe fixed-length cutting device according to claim 1, characterized in that: The laser path of the laser cutter (7) is perpendicular to the axis of the three-jaw chuck (3), and the laser cutter (7) moves in a straight line along the laser path. The distance between the laser emission point of the laser cutter (7) and the outer wall of the seamless steel pipe is fixed.

3. The seamless steel pipe fixed-length cutting device according to claim 1, characterized in that: A cutting bracket (4) is provided on one side of the three-jaw chuck (3). The lifting cylinder (5) is fixedly installed on the upper part of the cutting bracket (4). A bracket guide rail (10) is fixedly installed on the side of the cutting bracket (4) near the three-jaw chuck (3). A stabilizing bracket (9) is slidably engaged on the bracket guide rail (10). The stabilizing bracket (9) is fixedly installed at the bottom end of the mounting connector (6).

4. The seamless steel pipe fixed-length cutting device according to claim 3, characterized in that: The cutting bracket (4) is fixedly installed with an installation arm (11) on one side. The installation arm (11) is divided into two integrally formed upper and lower parts. The upper part is set as a horizontal section. A reflector (12) that cooperates with the distance sensor (8) is fixedly installed at the top of the horizontal section. The lower part is set as a vertical section. A reflector (13) that cooperates with the distance sensor (32) is fixedly installed on one side of the vertical section.

5. A seamless steel pipe fixed-length cutting device according to claim 1, characterized in that: The limiting baffle (33) has a rotating groove on the side near the three-jaw chuck (3). A mating bearing (34) is fixedly installed inside the rotating groove. A rotating baffle (35) is fixedly installed inside the mating bearing (34). Multiple stabilizing slide rods (20) that are slidably connected to the limiting seat frame (17) are fixedly installed at equal intervals on one side of the mounting base (19).

6. The seamless steel pipe fixed-length cutting device according to claim 1, characterized in that: A bearing hydraulic cylinder (14) is provided between the laser cutter (7) and the mounting cylinder (19). A bearing seat plate (15) is fixedly installed on the top of the telescopic end of the bearing hydraulic cylinder (14). Two parallel bearing seat rollers (16) are rotatably installed on the upper surface of the bearing seat plate (15). The axis of the bearing seat rollers (16) is parallel to the axis of the three-jaw chuck (3).

7. The seamless steel pipe fixed-length cutting device according to claim 1, characterized in that: On the other side of the drive spindle box (2), a steel pipe feeding assembly is provided. The steel pipe feeding assembly includes two feeding units. The main body of the feeding unit is set as multiple rotating bearing rollers (23) arranged at equal intervals. The two sets of rotating bearing rollers (23) are staggered and tilted in opposite directions. The included angle is adjusted according to the outer diameter of the seamless steel pipe so that the seamless steel pipe carried by the two sets of rotating bearing rollers (23) is coaxial with the three-jaw chuck (3).

8. A seamless steel pipe fixed-length cutting device according to claim 7, characterized in that: The bottom end of the rotating bearing roller (23) in the same group is rotatably connected to a rotating connecting arm (22), and the rotating connecting arm (22) is rotatably connected to a fixed rotating connecting seat (21).

9. A seamless steel pipe fixed-length cutting device according to claim 7, characterized in that: An adjusting connecting arm (24) is rotatably connected to the top of the rotating bearing roller (23) of the same group. A servo motor (25) is fixedly installed at one end of the adjusting connecting arm (24). The servo motor (25) drives the rotating bearing roller (23) located at the end of the adjusting connecting arm (24). The two servo motors (25) are respectively located at both ends of the steel pipe feeding assembly.

10. A seamless steel pipe fixed-length cutting device according to claim 9, characterized in that: Multiple adjusting connecting seats (27) are fixedly connected at equal intervals on one side of the adjusting connecting arm (24). An adjusting connecting head (28) is rotatably installed inside the adjusting connecting seat (27). An adjusting hydraulic cylinder (29) is fixedly connected to the adjusting connecting head (28). A hydraulic cylinder rotating seat (30) is rotatably connected to the bottom end of the adjusting hydraulic cylinder (29). The linkage of the two sets of adjusting hydraulic cylinders (29) allows them to extend and retract synchronously, causing the two sets of rotating bearing rollers (23) to deflect synchronously.

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