CN113997184A

CN113997184A - Grinding device for material opening of steel pipe

Info

Publication number: CN113997184A
Application number: CN202111127192.9A
Authority: CN
Inventors: 韩波; 周金苗; 王雷; 严加彬
Original assignee: Jiangsu Huacheng Industry Pipe Making Corp
Current assignee: Jiangsu Huacheng Industry Pipe Making Corp
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-02-01

Abstract

The invention belongs to the technical field of steel pipe testing equipment, and discloses a grinding device for a material port of a steel pipe, which has the technical scheme that the grinding device comprises a driving part, a bearing part and a grinding part, wherein the driving part is arranged at one end of the bearing part, and the grinding part is arranged at one end of the bearing part, which is far away from the driving part; the bearing part comprises a workbench, an arc-shaped through groove arranged on the workbench and a clamping plate detachably connected to the workbench, and the clamping plate is arc-shaped with a downward arc opening and is coaxially arranged with the arc-shaped through groove; the driving part comprises a driving motor arranged at one end of the workbench and a supporting assembly connected to an output shaft of the driving motor, and the output shaft of the driving motor is coaxial with the arc through groove; the grinding part comprises a support table arranged at one end of the workbench far away from the driving motor, a grinding table connected to the support table in a sliding manner, and a grinding assembly arranged on the grinding table. The automatic polishing machine has the advantages of realizing automatic polishing and improving polishing efficiency.

Description

Grinding device for material opening of steel pipe

Technical Field

The invention relates to the field of steel pipe machining, in particular to a grinding device for a material port of a steel pipe.

Background

In the production and processing process of the steel pipe, the pipe blank generally needs to be heated at a high temperature, and then the next process flow is carried out. After the tube blank is machined into a steel tube, the steel tube is placed in a zone to be cooled so that the steel tube is slowly cooled. However, the surface of the steel pipe is exposed to air and oxidized by the air during the slow cooling process, so that an oxide layer is formed on the surface of the steel pipe. When the steel pipe needs to be welded, the oxide on the surface of the steel pipe deteriorates the welding effect, resulting in structural weakness of the steel pipe. Therefore, it is generally necessary to remove oxides from the surface of the mouth of the steel pipe before welding the steel pipe.

At present, chinese patent with publication number CN201931335U discloses a special tool for polishing a steel pipe opening, which comprises a conical abrasive body and two fixing shafts at two ends of the conical abrasive body, wherein the two fixing shafts at two ends are arranged on the axis of the conical body.

When the special tool for polishing the steel pipe opening works, the end with the small diameter faces upwards, the fixed shaft is clamped on an electric hand drill, and the end with the large diameter is sleeved on the outer opening of the steel pipe to polish the outer wall of the steel pipe; and then, the end with the large diameter of the special polishing tool for the steel pipe opening is upwards clamped on the electric hand drill, and the end with the small diameter is placed in the steel pipe opening to polish the inner wall of the steel pipe. However, in this manual polishing method, each steel pipe needs to be polished in labor time, and polishing efficiency is low.

Disclosure of Invention

The invention aims to provide a steel pipe material port grinding device which has the advantages of realizing automatic grinding and improving grinding efficiency.

The technical purpose of the invention is realized by the following technical scheme:

a grinding device for a material port of a steel pipe comprises a driving part, a bearing part and a grinding part, wherein the driving part is arranged at one end of the bearing part, and the grinding part is arranged at one end, far away from the driving part, of the bearing part;

the bearing part comprises a workbench, an arc-shaped through groove arranged on the workbench and a clamping plate detachably connected to the workbench, and the clamping plate is arc-shaped with a downward arc opening and is coaxially arranged with the arc-shaped through groove;

the driving part comprises a driving motor arranged at one end of the workbench and a supporting assembly connected to an output shaft of the driving motor, and the output shaft of the driving motor is coaxial with the arc through groove;

the grinding part comprises a support table arranged at one end of the workbench far away from the driving motor, a grinding table connected to the support table in a sliding manner, and a grinding assembly arranged on the grinding table.

Through adopting above-mentioned technical scheme, the pipe fitting is placed and is led to the inslot at the arc, and the clamp plate is laminated in the pipe fitting outside, and the arc leads to groove and clamp plate and plays spacing effect to the pipe fitting, and supporting component inserts in the pipe fitting to tightly support the inside wall of pipe fitting, driving motor drives supporting component and rotates, and then drives the pipe fitting and lead to the groove and the clamp plate rotates at the arc, and the subassembly of polishing accomplishes the mouth of pipe fitting and polishes. Realize the automatic pipe fitting of polishing, improve the efficiency of polishing to the pipe fitting.

Furthermore, the arc is led to the inslot rotation and is connected with first gyro wheel, rotates on the clamp plate and is connected with the second gyro wheel, and the axis direction of first gyro wheel and second gyro wheel all is parallel with the axis direction that the arc led to the groove, and the circumference orbit that the surface of first gyro wheel and second gyro wheel formed is coaxial with driving motor's output shaft.

Through adopting above-mentioned technical scheme, first gyro wheel pastes tightly respectively on the outer wall of pipe fitting with the second gyro wheel to rotate along with the rotation of pipe fitting, thereby reduce the pipe fitting when rotating and the arc lead to the groove and the clamping plate between the frictional force.

Furthermore, the supporting component comprises a driving threaded rod coaxially connected with an output shaft of the driving motor, a limiting block connected to the driving threaded rod and far away from one end of the driving motor, a moving block sliding on the driving threaded rod, a butterfly nut in threaded connection on the driving threaded rod, and a plurality of supporting frames evenly and equally distributed between the limiting block and the moving block, wherein the butterfly nut is arranged on one side, far away from the limiting block, of the moving block.

Through adopting above-mentioned technical scheme, the both ends of support frame rotate respectively and connect in the lateral wall of stopper and movable block, insert the back in the pipe fitting when supporting component, revolve wrong butterfly nut and promote the movable block and make the support frame tightly support the inside wall of pipe fitting, butterfly nut supports the movable block, reaches the fastening effect to the pipe fitting.

Furthermore, the support frame includes first bracing piece, with first bracing piece one end articulated second bracing piece, keep away from first bracing piece one end articulated third bracing piece with the second bracing piece, the one end that the second bracing piece was kept away from to first bracing piece articulates in the lateral wall of stopper, the one end that the second bracing piece was kept away from to the third bracing piece articulates in the lateral wall of movable block, the second bracing piece is on a parallel with the axis of driving motor output shaft.

Through adopting above-mentioned technical scheme, the support frame is the articulated pivoted structure of three pole, and the stability of its structure is better to improve the effect to the pipe fitting fastening.

Furthermore, the outer wall of the second support rod is coated with a friction pad.

Through adopting above-mentioned technical scheme, the friction pad is soft materials, and it can increase the frictional force between second bracing piece outer wall and the pipe fitting inner wall, improves the fastening effect to the pipe fitting.

Further, the grinding assembly comprises an outer grinding assembly and an inner grinding assembly which are arranged on the grinding table;

the outer side polishing assembly comprises a supporting plate arranged on the polishing platform, an outer side polishing motor arranged on the supporting plate and an outer side polishing roller connected to the outer side polishing motor, the outer side polishing roller is abutted against the outer side wall of the pipe fitting, and the axis of the outer side polishing roller is parallel to the axis of the arc-shaped through groove and is positioned right below the axis of the arc-shaped through groove;

the inboard subassembly of polishing is including setting up the connecting plate on the bench of polishing, setting up inboard polishing machine on the connecting plate, connect the inboard grinding roller on inboard polishing machine, and the inboard grinding roller is contradicted with the inside wall of pipe fitting, and the axis of inboard grinding roller is parallel with the logical groove axis of arc, and is parallel with the plane that the axis that the groove was led to the arc formed and the horizontal plane.

Through adopting above-mentioned technical scheme, the inboard inside wall that the roller can contradict the pipe fitting of polishing, the lateral wall that the roller can contradict the pipe fitting is polished in the outside. When the pipe fitting rotated in the logical inslot of arc, the inboard grinding roller, the outside roller of polishing can polish the inside and outside wall of pipe fitting, realize the effect of polishing automatically.

Furthermore, a lifting cylinder is arranged below the supporting plate, and a lifting groove for placing the lifting cylinder is formed in the polishing platform.

Through adopting above-mentioned technical scheme, the pipe fitting is placed and is led to the inslot back in the arc, adjusts the height of outside grinding roller for its lateral wall of contradicting the pipe fitting guarantees that the outside grinding roller can conflict with the pipe fitting outer wall, is convenient for polish the pipe fitting.

Furthermore, a driving cylinder is arranged below the connecting plate and fixedly connected to the grinding table, and the moving direction of the connecting plate is perpendicular to the axis direction of the arc-shaped through groove.

Through adopting above-mentioned technical scheme, place the pipe fitting before the inslot is led to the arc, drive actuating cylinder and can adjust the distance between inboard grinding roller and the pipe fitting inside wall, place at the inslot back is led to the arc when the pipe fitting, drive actuating cylinder pulling inboard grinding roller and make inboard grinding roller contradict the inside wall of pipe fitting, realize polishing to the pipe fitting.

Furthermore, a movable cylinder is arranged on the supporting table, the motion direction of a telescopic rod of the movable cylinder is consistent with the axis direction of the arc-shaped through groove, and the telescopic rod of the movable cylinder is connected with the polishing table.

Through adopting above-mentioned technical scheme, remove the cylinder and can adjust the distance between platform and the workstation of polishing, the pipe fitting is before placing the logical inslot of arc, and remove the cylinder and make the workstation and polish the distance grow between the platform, conveniently places the pipe fitting at the logical inslot of arc, can realize the effect of polishing to the pipe fitting of different length in addition.

Furthermore, a guide rail is arranged on the supporting table, and a guide groove matched with the guide rail is arranged below the polishing table.

Through adopting above-mentioned technical scheme, guide rail sliding connection is in the guide way, is convenient for remove the platform of polishing, reduces the probability that the dislocation takes place for the platform of polishing in the direction of perpendicular guide rail, improves the polishing precision of inboard grinding roller and outside grinding roller.

In conclusion, the invention has the following beneficial effects:

1. the automatic pipe polishing device has the advantages that the automatic pipe polishing work is realized through the arrangement of the driving part, the bearing part and the grinding part;

2. the second idler wheel is arranged on the clamping plate, and the first idler wheel is arranged in the arc-shaped through groove, so that the friction force between the pipe fitting and the clamping plate and between the pipe fitting and the arc-shaped through groove is reduced, the stable rotation of the high pipe fitting is facilitated, and the polishing quality is improved;

3. through the setting of portable grinding portion, realized polishing to the different internal diameter pipe fittings of the same external diameter, realized the effect of polishing of unidimensional pipe fitting.

Drawings

FIG. 1 is a schematic structural diagram for embodying the present invention;

FIG. 2 is a schematic structural view for embodying a support assembly;

FIG. 3 is a schematic diagram of a structure for embodying an abrading assembly;

FIG. 4 is an exploded view of a cylinder embodying the lift cylinder;

fig. 5 is an enlarged view for embodying the portion a in fig. 2.

In the figure, 1, a workbench; 2. an arc-shaped through groove; 3. a clamping plate; 21. a first roller; 31. a second roller; 4. a drive motor; 5. a support assembly; 51. driving the threaded rod; 52. a limiting block; 53. a moving block; 54. A butterfly nut; 55. a support frame; 551. a first support bar; 552. a second support bar; 553. a third support bar; 6. a friction pad; 7. a support table; 8. a polishing table; 9. a guide rail; 10. a guide groove; 11. a moving cylinder; 12. a support plate; 13. polishing the motor on the outer side; 14. grinding rollers are arranged on the outer side; 15. a lifting cylinder; 16. A guide bar; 17. a connecting plate; 18. polishing the motor on the inner side; 19. grinding rollers are arranged on the inner side; 20. a U-shaped supporting plate; 22. A driving cylinder; 23. a pipe fitting.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b): a grinding device for a material opening of a steel pipe refers to fig. 1 and comprises a driving part, a bearing part and a grinding part, wherein the driving part is arranged at one end of the bearing part, and the grinding part is arranged at one end, far away from the driving part, of the bearing part.

Referring to fig. 1, the bearing portion includes a workbench 1, an arc-shaped through groove 2 (refer to fig. 2) disposed on the workbench 1, and a plurality of clamping plates 3 detachably connected to the workbench 1 by bolts, wherein two clamping plates 3 are embodied in the figure, and the two clamping plates 3 are respectively disposed at two ends of the arc-shaped through groove 2. The clamping plate 3 is arc-shaped with an arc opening facing downwards and is coaxially arranged with the arc through groove 2. Pipe fitting 23 is placed in logical groove 2 of arc, and clamp plate 3 laminates in the pipe fitting 23 outside, and logical groove 2 of arc and clamp plate 3 play spacing effect to pipe fitting 23.

When groove 2 and clamping plate 3 play limiting displacement to pipe fitting 23 through the arc, there is certain frictional force between groove 2 and the clamping plate 3 through pipe fitting 23 and arc, for the stability of polishing that improves, reduce frictional force and to pipe fitting 23 pivoted influence, it is connected with a plurality of first gyro wheels 21 (refer to fig. 2) to lead to the inslot 2 internal rotation at the arc, embody two rows of first gyro wheels 21 in the picture, it is connected with a plurality of second gyro wheels 31 to rotate on clamping plate 3 simultaneously, embody in the picture that there are five first gyro wheels 21 on every clamping plate 3. The axial directions of the first roller 21 and the second roller 31 are both parallel to the axial direction of the arc-shaped through groove 2, and the circumferential track formed on the surfaces of the first roller 21 and the second roller 31 is coaxial with the axial line of the arc-shaped through groove 2; the friction mode between the pipe fitting 23 and the arc-shaped through groove 2 and the clamping plate 3 is changed into dynamic friction through the first roller 21 and the second roller 31, so that the effect of reducing friction force is achieved, and the pipe fitting 23 is stable in rotation.

Referring to fig. 2, the driving portion includes a driving motor 4 fixedly connected to one end of the worktable 1 and a supporting component 5 fixedly connected to an output shaft of the driving motor 4, and the output shaft of the driving motor 4 and the axis of the arc-shaped through groove 2 are coaxially arranged. The supporting component 5 comprises a driving threaded rod 51 coaxially and fixedly connected with an output shaft of the driving motor 4, a limiting block 52 fixedly connected to one end, far away from the driving motor 4, of the driving threaded rod 51, a moving block 53 sliding on the driving threaded rod 51, a butterfly nut 54 in threaded connection with the driving threaded rod 51, and a plurality of supporting frames 55 evenly and equally distributed between the limiting block 52 and the moving block 53, wherein four supporting frames 55 are embodied in the drawing, the distance between every two adjacent supporting frames 55 is equal, and the butterfly nut 54 is arranged on one side, far away from the limiting block 52, of the moving block 53.

Two ends of the support frame 55 are rotatably connected to the side walls of the limit block 52 and the moving block 53 respectively, when the support assembly 5 is inserted into the pipe 23, the butterfly nut 52 is screwed to push the moving block 53, so that the support frame 55 tightly abuts against the inner side wall of the pipe 23, and the butterfly nut 52 abuts against the moving block 53, thereby achieving the effect of fastening the pipe 23; the driving motor 4 drives the supporting component 5 to rotate, so as to drive the pipe fitting 23 to rotate.

Referring to fig. 2, the supporting frame 55 includes a first supporting rod 551, a second supporting rod 552 hinged to one end of the first supporting rod 551, and a third supporting rod 553 hinged to one end of the second supporting rod 552 away from the first supporting rod 551, one end of the first supporting rod 551 away from the second supporting rod 552 is hinged to a side wall of the limiting block 52, one end of the third supporting rod 553 away from the second supporting rod 552 is hinged to a side wall of the moving block 53, and the second supporting rod 552 is parallel to an axis of the output shaft of the driving motor 4. The support frame 55 is a mode of hinging and rotating three rods, the structural stability is better, and the second support rod 552 tightly props against the inner side wall of the pipe 23 (refer to fig. 1), so that the fastening effect on the pipe 23 is improved.

Referring to fig. 2 and 5, the outer side wall of the second supporting rod 552 is fixedly wrapped with a friction pad 6, the friction pad 6 is made of soft material, and the friction pad 6 can increase the friction force between the inner side walls of the second supporting rod 552 and the pipe 23 (see fig. 1), so that the fastening effect on the pipe 23 is improved, and the pipe can be stably rotated.

Referring to fig. 3, the grinding portion includes a supporting table 7 (refer to fig. 1) fixedly connected to one end of the working table 1 (refer to fig. 1) far from the driving motor 4, a grinding table 8 connected to the supporting table 7 in a sliding manner, and a grinding assembly disposed on the grinding table 8. The grinding assembly comprises an outer grinding assembly and an inner grinding assembly which are arranged on the grinding table 8; the inside grinding roller, the outside grinding roller can polish to the inside and outside wall of pipe fitting, realize the effect of polishing automatically.

Referring to fig. 3, the outside grinding assembly includes a support plate 12 provided on the grinding table 8, an outside grinding motor 13 provided on the support plate 12, and an outside grinding roller 14 connected to an output shaft of the outside grinding motor 13. The polishing table 8 is provided with a lifting groove, a lifting cylinder 15 (refer to fig. 4) which is vertically arranged is fixedly connected in the lifting groove, and a telescopic rod of the lifting cylinder 15 is fixedly connected to the bottom of the supporting plate 12. The axis of the outer grinding roller 14 is parallel to the axis of the arc through groove 2 (refer to fig. 2), and is positioned right below the axis of the arc through groove 2; the lifting cylinder 15 can move the outer grinding roller 14 up and down, and the outer grinding roller 14 is abutted against the outer side wall of the pipe 23 (see fig. 1), so that stable grinding is facilitated.

In order to further improve the polishing stability and reduce the position deviation of the support plate 12 in the up-and-down moving process, a plurality of vertically arranged guide rods 16 are fixedly connected to the polishing table 8, the four guide rods 16 are shown in the figure, the guide rods 16 penetrate through the support plate 12, the support plate 12 slides up and down on the guide rods 16, and the moving stability of the support plate 12 is improved.

Referring to fig. 3, the inside grinding assembly includes a connection plate 17 provided on the grinding table 8, an inside grinding motor 18 provided on the connection plate 17, and an inside grinding roller 19 connected to the inside grinding motor 18. The inverted U-shaped supporting plate 20 is fixedly connected to the polishing table 8, a driving cylinder 22 is fixedly connected to the top of the U-shaped supporting plate 20, and a telescopic rod of the driving cylinder 22 is fixedly connected to the side wall of the connecting plate 17. The telescopic rod horizontal motion of driving cylinder 22 just is perpendicular with the axis that the groove was led to the arc, can realize to keeping away from, being close to pipe fitting 23 (refer to fig. 1) axle center direction pulling inboard grinding roller 19 for inboard grinding roller 19 contradicts with the inside wall of pipe fitting 23, and inboard grinding roller 19's axis is parallel with the groove 2 (refer to fig. 2) axis that leads to of arc, and inboard grinding roller 19 axis just leads to 2 axes formation planes and horizontal plane parallel with the arc.

Referring to fig. 3, when the pipe 23 is placed inside the arc-shaped through groove 2, since there is a case where the outside grinding assembly and the inside grinding assembly interfere with each other, the support table 7 (refer to fig. 1) is movably provided in order to reduce the interference. A guide rail 9 (refer to fig. 1) is fixedly connected to the support table 7 along the axial direction of the arc-shaped through groove 2 (refer to fig. 2), and a guide groove 10 matched with the guide rail 9 is formed below the polishing table 8. One end of the support table 7, which is far away from the workbench 1 (refer to fig. 1), is fixedly connected with a movable cylinder 11 (refer to fig. 1), the motion direction of a telescopic rod of the movable cylinder 11 is consistent with the axis direction of the arc-shaped through groove 2, and the telescopic rod of the movable cylinder 11 is connected with the polishing table 8.

Referring to fig. 3, before the pipe 23 (see fig. 1) is placed in the arc-shaped through groove 2 (see fig. 2), the moving cylinder 11 (see fig. 1) pulls the polishing table 8 to move away from the workbench 1 (see fig. 1), then the pipe 23 is placed in the arc-shaped through groove 2, and finally the moving cylinder 11 drives the polishing table 8 to approach in the direction of the workbench 1, so that the pipe 23 is conveniently placed in the arc-shaped through groove 2.

The specific implementation process comprises the following steps:

before the pipe fitting 23 is placed in the arc-shaped through groove 2, the moving cylinder 11 pulls the grinding table 8 to move towards the direction far away from the workbench 1; the lifting cylinder 15 pulls the support plate 12 to move downwards, so that the outer grinding roller 14 is lower than the lowest end of the arc-shaped through groove 2; the driving cylinder 22 pushes the inner grinding roller 19 so that the inner grinding roller 19 is located at the axis of the pipe 23; screwing the butterfly nut 54 in a direction close to the driving motor 4 and pulling the moving block 53 in the direction of the driving motor 4, so that the supporting component 5 is narrowed in a direction perpendicular to the width direction of the driving threaded rod 51; the clamping plate 3 is removed from the table 1.

Placing the pipe fitting 23 in the arc-shaped through groove 2, installing the clamping plate 3 on the workbench 1, and positioning the pipe fitting by the arc-shaped through groove 2 and the clamping plate 3; an operator adjusts the butterfly nut 54 in the pipe from the side close to the driving motor, and the butterfly nut 54 pushes the moving block 53 away from the driving motor 4, so that the second supporting rod 552 of the supporting component 5 is parallel to the axis of the pipe and pushes against the inner side wall of the pipe 23, thereby supporting and clamping the pipe.

The moving cylinder 11 pushes the polishing table 8 to move towards the direction close to the workbench 1, so that the outer polishing roller 14 moves to the lower part of the pipe fitting, meanwhile, the inner polishing roller 19 moves to the inner part of the pipe fitting, and parts of the outer polishing roller 14 and the inner polishing roller 19 are exposed outside the pipe fitting; the lifting cylinder 15 pushes the support plate 12 to move upward and make the outer grinding roller 14 abut against the outer side wall of the pipe 23; the drive cylinder 22 pulls the inner grinding roller 19 so that the inner grinding roller 19 abuts the inner side wall of the tube 23.

Finally, simultaneously starting the driving motor 4, the outer side polishing motor 13 and the inner side polishing motor 18 to polish the pipe orifice of the pipe fitting 23; and after polishing is finished, reversely implementing the operation steps, unloading the polished pipe fitting, and performing next polishing work. The power sources of the action parts mentioned in the working process are all embodied in an external connection mode, and the specific content is not related.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a material mouth grinding device for steel pipe which characterized in that: the grinding device comprises a driving part, a bearing part and a grinding part, wherein the driving part is arranged at one end of the bearing part, and the grinding part is arranged at one end of the bearing part, which is far away from the driving part;

the bearing part comprises a workbench (1), an arc-shaped through groove (2) arranged on the workbench (1) and a clamping plate (3) detachably connected to the workbench (1), wherein the clamping plate (3) is arc-shaped with an arc opening facing downwards and is coaxially arranged with the arc-shaped through groove (2);

the driving part comprises a driving motor (4) arranged at one end of the workbench (1) and a supporting component (5) connected to an output shaft of the driving motor (4), and the output shaft of the driving motor (4) is coaxially arranged with the arc through groove (2);

the grinding part comprises a support table (7) arranged at one end, far away from the driving motor (4), of the workbench (1), a grinding table (8) connected to the support table (7) in a sliding mode, and a grinding assembly arranged on the grinding table (8).

2. The grinding device for the material opening of the steel pipe according to claim 1, characterized in that: the arc leads to the groove (2) internal rotation and is connected with first gyro wheel (21), rotates on pinch-off blades (3) and is connected with second gyro wheel (31), and the axis direction of first gyro wheel (21) and second gyro wheel (31) all is parallel with the axis direction that the groove (2) was led to the arc, and the circumference orbit that first gyro wheel (21) and the surface of second gyro wheel (31) formed is coaxial with the output shaft of driving motor (4).

3. The grinding device for the material opening of the steel pipe according to claim 1, characterized in that: the supporting assembly (5) comprises a driving threaded rod (51) coaxially connected with an output shaft of the driving motor (4), a limiting block (52) connected to one end, far away from the driving motor (4), of the driving threaded rod (51), a moving block (53) sliding on the driving threaded rod (51), a butterfly nut (54) in threaded connection with the driving threaded rod (51), and a plurality of supporting frames (55) evenly and equally distributed between the limiting block (52) and the moving block (53), wherein the butterfly nut (54) is arranged on one side, far away from the limiting block (52), of the moving block (53).

4. The grinding device for the material opening of the steel pipe according to claim 3, characterized in that: the supporting frame (55) comprises a first supporting rod (551), a second supporting rod (552) hinged to one end of the first supporting rod (551), and a third supporting rod (553) hinged to one end of the first supporting rod (551) and one end of the second supporting rod (552) are far away, one end, far away from the second supporting rod (552), of the first supporting rod (551) is hinged to the side wall of the limiting block (52), one end, far away from the second supporting rod (552), of the third supporting rod (553) is hinged to the side wall of the moving block (53), and the second supporting rod (552) is parallel to the axis of an output shaft of the driving motor (4).

5. The grinding device for the material opening of the steel pipe according to claim 4, characterized in that: the outer wall of the second supporting rod (552) is coated with a friction pad (6).

6. The grinding device for the material opening of the steel pipe according to claim 1, characterized in that: the grinding assembly comprises an outer side grinding assembly and an inner side grinding assembly which are arranged on the grinding table (8);

the outer side polishing assembly comprises a supporting plate (12) arranged on the polishing platform (8), an outer side polishing motor (13) arranged on the supporting plate (12) and an outer side polishing roller (14) connected to the outer side polishing motor (13), wherein the outer side polishing roller (14) is abutted against the outer side wall of the pipe fitting (23), and the axis of the outer side polishing roller (14) is parallel to the axis of the arc-shaped through groove (2) and is positioned right below the axis of the arc-shaped through groove (2);

the inboard subassembly of polishing is including setting up connecting plate (17) on platform (8) of polishing, inboard polishing motor (18) of setting on connecting plate (17), inboard grinding roller (19) of connection on inboard polishing motor (18), inboard grinding roller (19) are contradicted with the inside wall of pipe fitting (23), the axis and the arc of inboard grinding roller (19) lead to groove (2) axis parallel, and parallel with the plane and the horizontal plane that the axis of arc logical groove (2) formed.

7. The grinding device for the material opening of the steel pipe as claimed in claim 6, wherein: a lifting cylinder (15) is arranged below the supporting plate (12), and a lifting groove for placing the lifting cylinder (15) is formed in the grinding table (8).

8. The grinding device for the material opening of the steel pipe as claimed in claim 6, wherein: a driving cylinder (22) is arranged below the connecting plate (17), the driving cylinder (22) is fixedly connected to the grinding table (8), and the moving direction of the connecting plate (17) is perpendicular to the axis direction of the arc-shaped through groove (2).

9. The grinding device for the material opening of the steel pipe as claimed in claim 6, wherein: a movable cylinder (11) is arranged on the supporting table (7), the motion direction of a telescopic rod of the movable cylinder (11) is consistent with the axis direction of the arc-shaped through groove (2), and the telescopic rod of the movable cylinder (11) is connected with the polishing table (8).

10. The grinding device for the material opening of the steel pipe according to claim 9, characterized in that: a guide rail (9) is arranged on the supporting table (7), and a guide groove (10) matched with the guide rail (9) is arranged below the polishing table (8).