A seamless steel pipe inner hole grinding device and grinding process thereof

Abstract

The present invention discloses a seamless steel pipe inner hole grinding device and a grinding process thereof, which relates to the technical field of seamless steel pipe manufacturing, including an annular bracket and a sequential drive component, wherein a sequential drive component slides inside the hole of the annular bracket, and the sequential drive component includes an electric cylinder, a mounting plate, a core rod, a fan interface, a dust suction nozzle, a taper sleeve, a bearing, a key shaft, a mounting pin and a connecting rod. During the use of the present invention, the adaptive fitting component and the inner hole grinding component of the present application are both sequentially driven by the sequential drive component, and the driving roller is driven to fit tightly with the inner wall of the seamless steel pipe through the first stage of the core rod so that the fuselage remains stable during the movement, and the grinding blocks at four sides are driven to expand through the second stage of the core rod to perform adaptive inner hole grinding on seamless steel pipes of different specifications, and the pushing of the core rod does not interfere with the rotation of the movable turntable, so that the present application has a compact structure, a reasonable design and strong applicability.

Description

Technical Field

[0001] The invention relates to the technical field of seamless steel pipe manufacturing, in particular to a seamless steel pipe inner hole grinding device and a grinding process thereof. Background Art

[0002] Seamless steel pipes are widely used, especially in oil fields as oil pipes. After the seamless steel pipe is processed into a blank pipe, certain burrs or impurities will be formed on the inner surface of the seamless steel pipe. Therefore, the inner wall of the seamless steel pipe needs to be ground to ensure that the smoothness and precision of the inner wall meet the use requirements.

[0003] In order to meet this demand, a steel pipe inner hole grinding machine has been introduced into the existing technology. This grinding machine drives the grinding wheel to grind the inner wall of the steel pipe by the rotation of the grinding rod, and realizes the back and forth movement of the grinding wheel on the inner wall of the steel pipe by the movement of the push rod, thereby completing the grinding process of the entire inner wall. However, the above-mentioned grinding device usually requires the grinding head to penetrate into the steel pipe to grind the inner hole of the steel pipe, which is not convenient for grinding the inner hole of a longer steel pipe, and the dust generated during the grinding process can easily affect the construction environment and the health of the workers.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a seamless steel pipe inner hole grinding device and grinding process thereof are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a seamless steel pipe inner hole grinding device and a grinding process thereof to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a seamless steel pipe inner hole grinding device and a grinding process thereof, comprising an annular bracket and a sequential drive component, a sequential drive component is slidably arranged inside the hole of the annular bracket, the sequential drive component comprises an electric cylinder, a mounting plate, a core rod, a fan interface, a dust suction nozzle, a tapered sleeve, a bearing, a key shaft, a mounting pin and a connecting rod, the electric cylinder is fixed to the back disk surface of the annular bracket, and the output end of the electric cylinder is fixedly connected to the mounting plate, the inner side of the end of the mounting plate is fixedly connected to the core rod, and the core rod is slidably matched with the hole in the annular bracket, the tail end of the hollow air duct inside the core rod is connected to the fan interface, and the head end of the hollow air duct inside the core rod is connected to the dust suction nozzle, the root of the core rod is fixed with a tapered sleeve, and the end of the core rod is fixed with a bearing, a key shaft is rotatably installed inside the bearing, and a mounting pin is fixed to a plane array at the end of the key shaft, and a connecting rod is rotatably installed inside the mounting pin.

[0007] Furthermore, a driving motor is fixed to the outer edge of the annular bracket, and a pinion is fixedly connected to the output end of the driving motor.

[0008] Furthermore, the annular bracket has several adaptive fitting components arranged in an array along the central axis in the circumferential direction, and the adaptive fitting components include sliding holes and sliding rods. The sliding holes are arranged in an array along the circumferential direction of the annular bracket, and the sliding rods slide inside the sliding holes.

[0009] Furthermore, the adaptive fitting component also includes a wedge and a spring. The wedge is fixed at the bottom of the slide rod, and the bottom inclined surface of the wedge matches the outer conical surface of the cone sleeve. The top of the wedge is sleeved with a spring, and the diameter of the spring is larger than the bottom aperture of the slide hole.

[0010] Furthermore, the adaptive fitting component also includes a limit plate and a mounting bracket. The limit plate is fixed on the top of the slide rod, and the diameter of the limit plate is larger than the top aperture of the slide hole, and mounting brackets are fixed on both sides of the top of the limit plate.

[0011] Furthermore, the adaptive fitting component also includes a micro motor and a driving roller. A micro motor is fixed to the outside of the mounting bracket on one side, and the micro motor is transmission-connected to the driving rollers in the mounting brackets on both sides, and the driving rollers are tightly fitted to the inner wall of the seamless steel pipe.

[0012] Furthermore, a movable turntable is rotatably mounted on the front of the annular bracket through a slewing bearing, and an outer gear ring is distributed in a circular array on the movable turntable, and the outer gear ring is meshed with the circumferential gear teeth of the pinion. An internal keyway is opened inside the hole in the movable turntable, and the size of the internal keyway matches the key convexity on the key shaft surface.

[0013] Furthermore, an inner hole grinding assembly is fixed on the front side of the movable turntable, and the inner hole grinding assembly includes a cross, a groove and a sliding pin. The cross is fixed to the front surface of the movable turntable through ribs, and the extending plates of the cross are provided with grooves at four sides. A sliding pin is correspondingly slid inside the groove, and one side of the sliding pin is rotatably matched with the mounting pin through a connecting rod.

[0014] Furthermore, the inner hole grinding assembly also includes a rod and a grinding block. The other side of the sliding pin is fixed with a rod, and the end of the rod is bolted with a grinding block, and the grinding block grinds the inner wall of the seamless steel pipe by rotating.

[0015] A grinding process of a seamless steel pipe inner hole grinding device, applied to the above-mentioned seamless steel pipe inner hole grinding device, comprises the following steps:

[0016] S1: First, the outer conical surface of the conical sleeve at the root of the core rod squeezes the bottom conical surface of the wedge block, so that the wedge block overcomes the elastic force of the spring and drives the slide rod to be ejected from the corresponding slide hole, and further drives the driving roller in the mounting bracket at the top of the limit plate to fit closely with the inner wall of the seamless steel pipe, so that the driving roller driven by the micro motor keeps the fuselage stable during the movement;

[0017] S2: Secondly, during the forward movement of the key shaft, the mounting pin on the plane at the end of the key shaft pushes the sliding pin to slide in the corresponding groove through the connecting rod, so that the grinding blocks at four locations are synchronously unfolded and close to the inner wall of the seamless steel pipe;

[0018] S3: Finally, the driving motor is started and the pinion is driven to rotate. The pinion meshes with the outer gear ring of the movable turntable through the circumferential tooth shape, driving the movable turntable to rotate on the front of the annular bracket through the slewing bearing, and further drives the grinding block on the front of the movable turntable to rotate through the keyway in the middle of the movable turntable and the key shaft to realize the rotation grinding of the inner wall of the seamless steel pipe during the moving process;

[0019] S4: Impurities dropped during the grinding process enter the air duct inside the core rod through the dust suction nozzle, and are further passed into the dust suction fan through the fan interface for filtering.

[0020] The present invention provides a seamless steel pipe inner hole grinding device and grinding process thereof, which have the following beneficial effects:

[0021] 1. During the use of the present invention, the outer conical surface of the conical sleeve at the root of the core rod cooperates with the bottom conical surface of the wedge block arranged in the circumferential array of the annular bracket, so that the wedge block overcomes the elastic force of the spring to drive the slide rod to be ejected from the corresponding slide hole, and further drives the driving roller in the top mounting bracket of the limit plate to fit tightly with the inner wall of the seamless steel pipe, so that the driving roller driven by the micro motor keeps the fuselage stable during the movement. The present application adapts to seamless steel pipes of different inner diameters through the setting of an adaptive fitting component, and through the self-propelled structure design driven by a micro motor, the grinding operation is not limited by the length of the seamless steel pipe. This is particularly applicable when performing inner hole grinding operations on longer seamless steel pipes.

[0022] 2. During the use of the present invention, when the key shaft moves forward, the mounting pin on the plane at the end of the key shaft pushes the sliding pin to slide in the corresponding groove through the connecting rod, so that the four grinding blocks are synchronously expanded and close to the inner wall of the seamless steel pipe, which can not only adapt to the grinding needs of seamless steel pipes with different inner diameters, but also avoid the generation of gaps between the grinding blocks and the inner wall of the seamless steel pipe during the grinding process, thereby affecting the grinding effect. The adaptive fitting component and the inner hole grinding component of the present application are both sequentially driven by the sequential driving component. The driving roller is driven to fit tightly with the inner wall of the seamless steel pipe through the first stage of the pushing of the core rod to keep the fuselage stable during the movement. The four grinding blocks are driven to expand through the second stage of the pushing of the core rod to perform adaptive inner hole grinding on seamless steel pipes of different specifications, and the pushing of the core rod does not interfere with the rotation of the movable turntable, so that the present application has a compact structure, a reasonable design, and strong applicability.

[0023] 3. During the use of the present invention, the driving motor is started to drive the pinion to rotate. The pinion meshes with the outer gear ring of the movable turntable through the circumferential tooth shape, driving the movable turntable to rotate through the slewing bearing located on the front side of the annular bracket, and further through the cooperation of the keyway in the middle of the movable turntable and the key shaft, the grinding block on the front side of the movable turntable is driven to rotate to realize the rotational grinding of the inner wall of the seamless steel pipe during the movement. The impurities detached during the grinding process enter the internal air duct of the core rod through the dust suction nozzle, and are further passed into the dust suction fan through the fan interface for filtration and treatment, so as to prevent the dust during the grinding process from affecting the construction environment and the health of the workers. The hollow design of the core rod is adopted in the present application, so that the grinding robot of the present application can realize synchronous dust suction during the self-propelled process, and the reasonable design does not interfere with the moving process of the grinding robot in the seamless steel pipe, which greatly facilitates the installation of the corrugated pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall external structure of the device of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the device of the present invention;

[0026] Figure 3 It is a schematic diagram of the overall internal structure of the device of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the adaptive fitting component of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the inner hole grinding assembly of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the sequential drive component of the present invention from the first perspective;

[0030] Figure 7 This is a schematic structural diagram of the sequential drive component of the present invention from a second viewing angle.

[0031] In the figure: 1. annular bracket; 2. driving motor; 3. small gear; 4. adaptive fitting component; 401. sliding hole; 402. sliding rod; 403. wedge block; 404. spring; 405. limit plate; 406. mounting bracket; 407. micro motor; 408. driving roller; 5. movable turntable; 6. outer gear ring; 7. inner keyway; 8. sequential drive component; 801. electric cylinder; 802. mounting plate; 803. core rod; 804. fan interface; 805. dust suction nozzle; 806. taper sleeve; 807. bearing; 808. key shaft; 809. mounting pin; 810. connecting rod; 9. inner hole grinding component; 901. cross; 902. strip groove; 903. sliding pin; 904. rod; 905. grinding block. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] See also Figures 1 to 7 The present invention provides a technical solution: comprising an annular bracket 1 and a sequential drive component 8, wherein the sequential drive component 8 slides inside the hole of the annular bracket 1, and the sequential drive component 8 comprises an electric cylinder 801, a mounting plate 802, a core rod 803, a fan interface 804, a dust suction nozzle 805, a cone sleeve 806, a bearing 807, a key shaft 808, a mounting pin 809 and a connecting rod 810, the electric cylinder 801 is fixed to the back disk of the annular bracket 1, and the output end of the electric cylinder 801 is fixedly connected to the mounting plate 802, and the inner side of the end of the mounting plate 802 A core rod 803 is fixedly connected, and the core rod 803 is slidably matched with the hole in the annular bracket 1, the tail end of the hollow air duct inside the core rod 803 is connected to a fan interface 804, and the head end of the hollow air duct inside the core rod 803 is connected to a dust suction nozzle 805, a cone sleeve 806 is fixed at the root of the core rod 803, and a bearing 807 is fixed at the end of the core rod 803, a key shaft 808 is rotatably installed inside the bearing 807, and a mounting pin 809 is fixed to the plane array at the end of the key shaft 808, and a connecting rod 810 is rotatably installed inside the mounting pin 809;

[0034] The specific operation is as follows: after the adaptive fitting component 4 and the inner hole grinding component 9 are both unfolded, and the driving roller 408 and the grinding block 905 are both fitted with the inner wall of the seamless steel pipe, the driving motor 2 is started to drive the pinion 3 to rotate, and the pinion 3 is meshed with the outer gear ring 6 of the circumferential tooth shape of the movable turntable 5, so as to drive the movable turntable 5 to rotate on the front side of the annular bracket 1 through the slewing bearing, and further through the cooperation between the keyway in the middle of the movable turntable 5 and the key shaft 808, the grinding block 905 on the front side of the movable turntable 5 is driven to rotate to realize the process of moving. For the rotary grinding of the inner wall of the seamless steel pipe, the impurities that fall off during the grinding process enter the internal air duct of the core rod 803 through the dust suction nozzle 805, and are further passed into the dust suction fan through the fan interface 804 for filtering and treatment, so as to avoid the dust during the grinding process from affecting the construction environment and the health of the workers. The hollow design of the core rod 803 enables the grinding robot of the present application to achieve synchronous dust suction during the self-propelled process, and the reasonable design does not interfere with the movement process of the grinding robot in the seamless steel pipe, which greatly facilitates the installation of the corrugated pipe;

[0035] See also Figure 3 to Figure 4A driving motor 2 is fixed to the outer edge of the annular bracket 1, and a pinion 3 is fixedly connected to the output end of the driving motor 2. The annular bracket 1 has several adaptive fitting components 4 arranged in an array along the central axis in a circumferential direction. The adaptive fitting component 4 includes a sliding hole 401 and a sliding rod 402. The sliding hole 401 is arranged in an array along the circumferential direction of the annular bracket 1, and a sliding rod 402 slides inside the sliding hole 401. The adaptive fitting component 4 also includes a wedge block 403 and a spring 404. A wedge block 403 is fixed to the bottom of the sliding rod 402, and the bottom inclined surface of the wedge block 403 matches the outer conical surface of the conical sleeve 806. A spring 404 is sleeved on the top of the wedge block 403, and the spring 404 4 has a diameter greater than the bottom aperture of the sliding hole 401, the adaptive fitting component 4 also includes a limit plate 405 and a mounting bracket 406, the limit plate 405 is fixed on the top of the sliding rod 402, and the limit plate 405 has a diameter greater than the top aperture of the sliding hole 401, and mounting brackets 406 are fixed on both sides of the top of the limit plate 405, the adaptive fitting component 4 also includes a micro motor 407 and a driving roller 408, a micro motor 407 is fixed on the outside of one side of the mounting bracket 406, and the micro motor 407 is connected to the driving rollers 408 in the mounting brackets 406 on both sides of the driving rollers 408, and the driving rollers 408 are tightly fitted with the inner wall of the seamless steel pipe;

[0036] The specific operation is as follows: the outer conical surface of the conical sleeve 806 at the root of the core rod 803 cooperates with the bottom conical surface of the wedge block 403 arranged in the circumferential array of the annular bracket 1, so that the wedge block 403 overcomes the elastic force of the spring 404 to drive the slide rod 402 to be ejected from the corresponding slide hole 401, and further drives the driving roller 408 in the bracket 406 installed at the top of the limit plate 405 to fit closely with the inner wall of the seamless steel pipe, so that the driving roller 408 driven by the micro motor 407 keeps the fuselage stable during the movement. The present application uses the setting of the adaptive fitting component 4 to adapt to seamless steel pipes of different inner diameters, and the self-propelled structure design driven by the micro motor 407 makes the grinding operation not limited by the length of the seamless steel pipe;

[0037] See also Figures 3 to 5A movable turntable 5 is rotatably mounted on the front of the annular bracket 1 through a slewing bearing, and an outer gear ring 6 is distributed in a circumferential array on the movable turntable 5, and the outer gear ring 6 is meshed with the circumferential gear teeth of the pinion 3. An inner keyway 7 is opened inside the hole of the movable turntable 5, and the size of the inner keyway 7 matches the key convexity on the surface of the key shaft 808. An inner hole grinding assembly 9 is fixed on the front of the movable turntable 5, and the inner hole grinding assembly 9 includes a cross 901, a strip groove 902 and a sliding pin 903. The cross 901 is connected to the movable turntable through ribs. The front plates are fixed, and the four extension plates of the cross 901 are all provided with strip grooves 902, and a sliding pin 903 is correspondingly slid inside the strip groove 902, and one side of the sliding pin 903 is rotatably matched with the mounting pin 809 through the connecting rod 810, and the inner hole grinding assembly 9 also includes a rod 904 and a grinding block 905, and the rod 904 is fixed on the other side of the sliding pin 903, and the grinding block 905 is bolted to the end of the rod 904, and the grinding block 905 realizes the grinding of the inner wall of the seamless steel pipe by rotation;

[0038] The specific operation is as follows: the end of the core rod 803 is rotatably connected to the key shaft 808 through the bearing 807, and the key protrusion on the circumference of the key shaft 808 cooperates with the internal key groove 7 opened inside the hole of the movable turntable 5, so that the core rod 803 always maintains a transmission connection with the movable turntable 5 during the process of pushing the key shaft 808 to move. Because the cross 901 is fixed to the front of the movable turntable 5 through the ribs, during the forward movement of the key shaft 808, the installation pin 809 on the plane of the end of the key shaft 808 pushes the sliding pin 903 to slide in the corresponding groove 902 through the connecting rod 810, so that the grinding blocks 905 at four sides are synchronously unfolded and close to the inner wall of the seamless steel pipe, which can not only adapt to the grinding needs of seamless steel pipes with different inner diameters, but also avoid the gap between the grinding block 905 and the inner wall of the seamless steel pipe during the grinding process, thereby affecting the grinding effect;

[0039] A grinding process of a seamless steel pipe inner hole grinding device, applied to the above-mentioned seamless steel pipe inner hole grinding device, comprises the following steps:

[0040] S1: First, the outer conical surface of the conical sleeve 806 at the root of the core rod 803 squeezes the bottom conical surface of the wedge block 403, so that the wedge block 403 overcomes the elastic force of the spring 404 and drives the slide bar 402 to be ejected from the corresponding slide hole 401, and further drives the driving roller 408 in the mounting bracket 406 at the top of the limit plate 405 to fit closely with the inner wall of the seamless steel pipe, so that the driving roller 408 driven by the micro motor 407 keeps the fuselage stable during the movement;

[0041] S2: Secondly, during the forward movement of the key shaft 808, the mounting pin 809 on the flat surface at the end of the key shaft 808 pushes the sliding pin 903 to slide in the corresponding groove 902 through the connecting rod 810, so that the grinding blocks 905 at four sides are synchronously unfolded and close to the inner wall of the seamless steel pipe;

[0042] S3: Finally, the driving motor 2 is started and drives the pinion 3 to rotate. The pinion 3 meshes with the outer gear ring 6 of the circumference of the movable turntable 5 through the circumferential tooth shape, driving the movable turntable 5 to rotate on the front side of the annular bracket 1 through the slewing bearing, and further drives the grinding block 905 on the front side of the movable turntable 5 to rotate through the cooperation between the keyway in the middle of the movable turntable 5 and the key shaft 808 to realize the rotation grinding of the inner wall of the seamless steel pipe during the moving process;

[0043] S4: Impurities dropped during the grinding process enter the internal air duct of the core rod 803 through the dust suction nozzle 805, and are further passed into the dust suction fan through the fan interface 804 for filtering.

[0044] In summary, when using the inner hole grinding device of the seamless steel pipe, the inner hole grinding self-propelled robot of the present application is placed at one end of the seamless steel pipe, and the dust suction fan is threadedly connected to the fan interface 804 through the bellows, then the electric cylinder 801 is activated and the core rod 803 is pushed through the mounting plate 802. First, the outer conical surface of the conical sleeve 806 at the root of the core rod 803 cooperates with the bottom conical surface of the wedge block 403 arranged in the circumferential array of the annular bracket 1, so that the wedge block 403 overcomes the elastic force of the spring 404 to drive the slide rod 402 to be located in the corresponding slide hole 401 and ejected, and further drives the driving roller 408 in the mounting bracket 406 at the top of the limit plate 405 to fit closely with the inner wall of the seamless steel pipe, so that the driving roller 408 driven by the micro motor 407 keeps the fuselage stable during the movement. The present application adapts to seamless steel pipes of different inner diameters through the setting of an adaptive fitting component 4, and the self-adaptive structural design driven by a micro motor 407 makes the grinding operation not limited by the length of the seamless steel pipe, which is particularly applicable when performing inner hole grinding operations on longer seamless steel pipes. Secondly, the end of the core rod 803 is rotatably connected to a key shaft 808 through a bearing 807, and the key protrusion on the circumference of the key shaft 808 cooperates with the internal key groove 7 opened inside the hole of the movable turntable 5, so that the core rod 803 always maintains a transmission connection with the movable turntable 5 during the process of pushing the key shaft 808 to move, and because the front side of the movable turntable 5 is fixed with a cross 901 by ribs, the installation pin 809 on the plane at the end of the key shaft 808 is connected during the forward movement of the key shaft 808. The rod 810 pushes the sliding pin 903 to slide in the corresponding strip groove 902, so that the four grinding blocks 905 are synchronously expanded and close to the inner wall of the seamless steel pipe, which can not only adapt to the grinding needs of seamless steel pipes with different inner diameters, but also avoid the gap between the grinding block 905 and the inner wall of the seamless steel pipe during the grinding process, thereby affecting the grinding effect. The adaptive fitting component 4 and the inner hole grinding component 9 of the present application are sequentially driven by the sequential driving component 8. The driving roller 408 is driven to fit closely with the inner wall of the seamless steel pipe through the first stage of the push of the core rod 803 to keep the fuselage stable during the movement. The four grinding blocks 905 are driven to expand and perform adaptive inner hole grinding on seamless steel pipes of different specifications through the push of the core rod 803 in the second stage. The interference with the rotation of the movable turntable 5 makes the present application compact in structure, reasonable in design and highly applicable. Finally, after the adaptive fitting component 4 and the inner hole grinding component 9 are unfolded and completed, and the driving roller 408 and the grinding block 905 are both fitted with the inner wall of the seamless steel pipe, the driving motor 2 is started and drives the pinion 3 to rotate. The pinion 3 meshes with the outer gear ring 6 of the circumference of the movable turntable 5 through the circumferential tooth shape, drives the movable turntable 5 to rotate on the front side of the annular bracket 1 through the slewing bearing, and further drives the grinding block 905 on the front side of the movable turntable 5 to rotate through the cooperation between the keyway in the middle of the movable turntable 5 and the key shaft 808, so as to realize the rotational grinding of the inner wall of the seamless steel pipe during the moving process. The impurities falling off during the grinding process enter the internal air duct of the core rod 803 through the dust suction nozzle 805.The dust is further filtered through the fan interface 804 to prevent the dust from affecting the construction environment and the health of the workers during the grinding process. The hollow design of the core rod 803 enables the grinding robot of the present application to achieve synchronous dust collection during the self-propelled process. The reasonable design does not interfere with the movement of the grinding robot in the seamless steel pipe, which greatly facilitates the installation of the corrugated pipe.

[0045] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various implementations with various modifications suitable for specific uses.

Claims

1. A seamless steel pipe inner hole grinding device, characterized in that: The invention comprises an annular support (1) and a sequential drive component (8), wherein the sequential drive component (8) is slidably disposed inside a hole in the annular support (1), and the sequential drive component (8) comprises an electric cylinder (801), a mounting plate (802), a core rod (803), a fan interface (804), a dust suction nozzle (805), a cone sleeve (806), a bearing (807), a key shaft (808), a mounting pin (809) and a connecting rod (810), wherein the electric cylinder (801) is fixed to a back surface of the annular support (1), and the output end of the electric cylinder (801) is fixedly connected to the mounting plate (802), and the inner side of the end of the mounting plate (802) is fixedly connected to the core rod (803), and the core rod (803) is slidably disposed in the hole in the annular support (1). The rear end of the hollow air duct inside the core rod (803) is connected to a fan interface (804), and the head end of the hollow air duct inside the core rod (803) is connected to a dust suction nozzle (805), a cone sleeve (806) is fixed at the root of the core rod (803), and a bearing (807) is fixed at the end of the core rod (803), a key shaft (808) is rotatably installed inside the bearing (807), and a mounting pin (809) is fixed in a plane array at the end of the key shaft (808), and a connecting rod (810) is rotatably installed inside the mounting pin (809), a driving motor (2) is fixed to the outer edge of the annular bracket (1), and a pinion (3) is fixedly connected to the output end of the driving motor (2), and the annular bracket (1) is circumferentially arranged along the central axis. There are several adaptive fitting components (4) distributed, the adaptive fitting components (4) comprising sliding holes (401) and sliding rods (402), the sliding holes (401) are distributed in an array along the circumference of the annular bracket (1), and the sliding rods (402) slide inside the sliding holes (401), the adaptive fitting components (4) further comprising a wedge block (403) and a spring (404), the wedge block (403) is fixed at the bottom of the sliding rod (402), and the bottom inclined surface of the wedge block (403) matches the outer conical surface of the conical sleeve (806), the top of the wedge block (403) is sleeved with a spring (404), and the diameter of the spring (404) is larger than the bottom hole diameter of the sliding hole (401), and the front side of the annular bracket (1) is rotatably mounted with a movable swivel bearing. The movable rotating disk (5) is provided with an outer gear ring (6) in a circumferential array, and the outer gear ring (6) meshes with the circumferential gear teeth of the pinion (3). An inner keyway (7) is provided inside the central hole of the movable rotating disk (5), and the size of the inner keyway (7) matches the key convexity on the surface of the key shaft (808). An inner hole grinding assembly (9) is fixed on the front of the movable rotating disk (5), and the inner hole grinding assembly (9) includes a cross (901), a strip groove (902) and a sliding pin (903). The cross (901) is fixed to the front surface of the movable rotating disk (5) through ribs, and the extending plates of the cross (901) are provided with strip grooves (902) at four sides, and a sliding pin (903) is correspondingly slid inside the strip groove (902).One side of the sliding pin (903) is rotatably matched with the mounting pin (809) through the connecting rod (810).

2. The inner hole grinding device of a seamless steel pipe according to claim 1, characterized in that: The adaptive fitting component (4) further comprises a limit plate (405) and a mounting bracket (406); the limit plate (405) is fixed on the top of the sliding rod (402); the diameter of the limit plate (405) is larger than the top hole diameter of the sliding hole (401); and mounting brackets (406) are fixed on both sides of the top of the limit plate (405).

3. The inner hole grinding device of a seamless steel pipe according to claim 2, characterized in that: The adaptive fitting component (4) further comprises a micro motor (407) and a driving roller (408); the micro motor (407) is fixed to the outside of the mounting bracket (406) on one side, and the micro motor (407) is transmission-connected to the driving rollers (408) in the mounting brackets (406) on both sides, and the driving rollers (408) are tightly fitted to the inner wall of the seamless steel pipe.

4. The inner hole grinding device of a seamless steel pipe according to claim 3 is characterized in that: The inner hole grinding assembly (9) further comprises a rod (904) and a grinding block (905); the rod (904) is fixed to the other side of the sliding pin (903); the grinding block (905) is bolted to the end of the rod (904); and the grinding block (905) grinds the inner wall of the seamless steel pipe by rotating.

5. A seamless steel pipe inner hole grinding process, applied to the seamless steel pipe inner hole grinding device as claimed in claim 4, characterized in that: The following steps are involved: S1: First, the outer conical surface of the conical sleeve (806) at the root of the core rod (803) squeezes the bottom conical surface of the wedge block (403), so that the wedge block (403) overcomes the elastic force of the spring (404) and drives the slide bar (402) to be located in the corresponding slide hole (401) and ejected, and further drives the driving roller (408) in the top mounting bracket (406) of the limit plate (405) to fit closely with the inner wall of the seamless steel pipe, so that the driving roller (408) driven by the micro motor (407) keeps the fuselage stable during the moving process; S2: Secondly, during the forward movement of the key shaft (808), the mounting pin (809) on the flat surface at the end of the key shaft (808) pushes the sliding pin (903) to slide in the corresponding groove (902) through the connecting rod (810), so that the grinding blocks (905) at four locations are synchronously unfolded and close to the inner wall of the seamless steel pipe; S3: Finally, the driving motor (2) is started to drive the pinion (3) to rotate. The pinion (3) meshes with the outer gear ring (6) of the movable turntable (5) through the circumferential tooth shape, driving the movable turntable (5) to rotate on the front side of the annular bracket (1) through the slewing bearing, and further drives the grinding block (905) on the front side of the movable turntable (5) to rotate through the cooperation between the keyway in the middle of the movable turntable (5) and the key shaft (808), so as to realize the rotation grinding of the inner wall of the seamless steel pipe during the moving process; S4: Impurities dropped during the grinding process enter the internal air duct of the core rod (803) through the dust suction nozzle (805), and are further passed through the fan interface (804) into the dust suction fan for filtering.

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