阅读说明：本技术 一种钢管内壁抛光机 (Polishing machine for inner wall of steel pipe ) 是由 邓兴中 刘凯 冯长征 于 2020-06-11 设计创作，主要内容包括：本发明涉及一种钢管内壁抛光机,包括用于固定钢管的固定机构及用于抛光钢管内壁的抛光机构,所述固定机构和所述抛光机构左右相对设置,所述固定机构包括第一机架、自动上下料装置、工件旋转装置和工件不走位装置；为了克服现有技术中的缺点,本发明的目的在于提供一种钢管内壁抛光机,解决现有抛光机在钢管内壁的抛光细度、管口到钢管纵深的均匀度等方面达不到高要求的问题。(The invention relates to a steel pipe inner wall polishing machine, which comprises a fixing mechanism for fixing a steel pipe and a polishing mechanism for polishing the inner wall of the steel pipe, wherein the fixing mechanism and the polishing mechanism are oppositely arranged on the left and right sides, and the fixing mechanism comprises a first rack, an automatic feeding and discharging device, a workpiece rotating device and a workpiece non-displacement device; in order to overcome the defects in the prior art, the invention aims to provide a steel pipe inner wall polishing machine, which solves the problem that the conventional polishing machine cannot meet high requirements on the polishing fineness of the inner wall of a steel pipe, the uniformity from a pipe orifice to the depth of the steel pipe and the like.)

1. The utility model provides a steel pipe inner wall burnishing machine, is including the fixed establishment that is used for fixed steel pipe (1) and the polishing mechanism who is used for polishing steel pipe (1) inner wall, fixed establishment with relative setting about the polishing mechanism, its characterized in that: the fixing mechanism comprises a first rack (2), an automatic loading and unloading device, a workpiece rotating device and a workpiece non-displacement device; the polishing mechanism comprises a polishing base (3), a polishing table (4), a polishing rod (5), a polishing wheel (6), a high-speed motor (8), a polishing rod adjusting device and a polishing rod pressure adjusting device, wherein one end of the polishing rod (5) is connected to the output end of the high-speed motor (8), and the other end of the polishing rod (5) is connected with the polishing wheel (6); the polishing rod adjusting device comprises a displacement trolley (9), a servo motor (10), a first gear (11), a rack (12) and at least two first turbine elevators (13), wherein the high-speed motor (8) and the servo motor (10) are fixed on the displacement trolley (9), the displacement trolley (9) can be placed on the polishing table (4) in a left-right moving mode, the rack (12) is transversely fixed on one side of the polishing table (4), and the first gear (11) is connected to the output end of the servo motor (10) and is matched with the rack (12); the first turbine lifter (13) is arranged between the polishing base (3) and the polishing table (4), the first turbine lifter (13) located on the same side of the polishing base (3) achieves synchronous rotation through a connecting rod (14), the connecting rod (14) is driven through a first motor (7), and the connecting rod (14) is matched with the first turbine lifter (13).

2. The steel pipe inner wall polishing machine according to claim 1, characterized in that: the polishing rod pressure adjusting device comprises a pressure adjusting cylinder (15), a first supporting plate (16), two first supports (17), a first cross rod (18), a second cross rod (19) and a first guide rod (20), wherein the two first supports (17) are fixed on two sides of the first supporting plate (16), the first cross rod (18) and the second cross rod (19) are both transversely fixed between the two first supports (17), and the first cross rod (18) and the second cross rod (19) are vertically and separately arranged; a first roller (21) and a second roller (22) are respectively arranged on the first cross bar (18) and the second cross bar (19), and the polished rod (5) is positioned between the first roller (21) and the second roller (22); the pressure adjusting cylinder (15) is fixed on the polishing table (4), and the output end of the pressure adjusting cylinder (15) is connected to the first supporting plate (16); the first guide rods (20) are fixed at the bottoms of two sides of the first supporting plate (16), and the first guide rods (20) downwards penetrate through the polishing table (4) and extend downwards for a certain length.

3. The steel pipe inner wall polishing machine according to claim 1, characterized in that: the automatic feeding and discharging device comprises two groups of feeding and discharging assemblies which are arranged in the first rack (2) from left to right, each group of feeding and discharging assemblies comprises a feeding plate (47), a feeding cylinder (23), an ejecting plate (24), two ejecting cylinders (25), a sliding block (26) and a second guide rod (27), the two ejecting cylinders (25) are arranged on two sides of the bottom of the first rack (2), and the ejecting plates (24) are connected with output ends of the two ejecting cylinders (25); the sliding block (26) is matched with the second guide rod (27), the second guide rod (27) is fixed on the ejector plate (24), the feeding plate (47) is fixed above the sliding block (26), and the output end of the feeding cylinder (23) is fixedly connected with the feeding plate (47); the feeding plate (47) is integrally flat, and one side of the feeding plate (47) is turned upwards.

4. The steel pipe inner wall polishing machine according to claim 1, characterized in that: the workpiece rotating device comprises a rotating motor (28) and at least two groups of rotating assemblies, each rotating assembly comprises a transmission rod (29) and two rotating wheels (30), the transmission rods (29) are transversely and rotatably arranged on the first rack (2), the two rotating wheels (30) are arranged at two ends of the transmission rods (29), one end of each transmission rod (29) is further provided with a second gear (31), a third gear (32) is arranged between the adjacent rotating assemblies, the third gears (32) are matched with the second gears (31), and the adjacent rotating assemblies are meshed with the third gears (32) through the second gears (31) to realize linkage; the rotating motor (28) is connected with the transmission rod (29) of one rotating assembly and drives the transmission rod (29) to rotate, and a driven wheel (33) is further arranged on the first rack (2).

5. The steel pipe inner wall polishing machine according to claim 1, characterized in that: the workpiece non-walking device comprises a second turbine lifter (34), a second supporting plate (35), a second support (36), a second motor (37), a screw rod (38), a worm wheel (39), a thimble (40), a parallel sliding plate (41) and a guide rail (42), wherein the second supporting plate (35) is connected with the output end of the second turbine lifter (34), the screw rod (38) is rotatably arranged on the second supporting plate (35), one end of the screw rod (38) is connected with the second motor (37) and driven by the second motor (37) to rotate, the worm wheel (39) is matched with the screw rod (38), the parallel sliding plate (41) is fixed on the worm wheel (39), the thimble (40) is fixed above the parallel sliding plate (41) through the second support (36), a sliding block (26) is arranged at the bottom of the parallel sliding plate (41), the sliding block (26) is matched with the guide rail (42).

6. The steel pipe inner wall polishing machine according to claim 5, wherein: the guide rails (42) are provided with two guide rails which are respectively positioned at two sides of the screw rod (38).

7. The steel pipe inner wall polishing machine according to claim 5 or 6, wherein: the thimble (40) is in a cone frustum shape as a whole.

8. The steel pipe inner wall polishing machine according to claim 7, characterized in that: the top of the first rack (2) is also provided with a material pressing cylinder (43), the output end of the material pressing cylinder (43) is arranged downwards, and the output end of the material pressing cylinder is provided with a limiting wheel (44).

9. The steel pipe inner wall polishing machine according to claim 1, characterized in that: the water tank (45) is arranged in the first rack (2), and the water pump (46) is connected with the water tank (45) through a pipeline.

Technical Field

The invention relates to the technical field of polishing machines, in particular to a steel pipe inner wall polishing machine.

Background

The steel pipe is widely applied to the field of pipelines due to the characteristics of stable chemical performance, cold resistance, heat resistance, pressure resistance, corrosion resistance, fire resistance and the like. In the process of manufacturing the steel pipe, because of manufacturing processes such as hot rolling, cold rolling and the like, the inner surface of the steel pipe is inevitably provided with unevenly distributed burrs, so that the flatness of the inner surface of the steel pipe is poor. Therefore, the burrs on the surface of the steel pipe need to be treated. Polishing refers to a process of reducing the roughness of a workpiece surface by mechanical, chemical, or electrochemical actions to obtain a bright, flat surface. The method is to carry out modification processing on the surface of a workpiece by using a polishing tool and abrasive particles or other polishing media. Therefore, the polishing technology can be applied to the inner wall of the steel pipe and used for removing burrs on the inner wall of the steel pipe, so that the surface of the inner wall of the steel pipe is flat and bright.

The steel pipe has a wide application range, wherein the requirements on the aspects of electronic cleaning, petroleum, chemical industry, food, medicine and the like are higher, the requirements of the fields are difficult to be met by general mechanical polishing, and a high-requirement steel pipe inner polishing machine is urgently needed aiming at the defects of the existing polishing machine.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a steel pipe inner wall polishing machine, which solves the problem that the conventional polishing machine cannot meet high requirements on the polishing fineness of the inner wall of a steel pipe, the uniformity from a pipe orifice to the depth of the steel pipe and the like.

The invention provides a steel pipe inner wall polishing machine which comprises a fixing mechanism for fixing a steel pipe and a polishing mechanism for polishing the inner wall of the steel pipe, wherein the fixing mechanism and the polishing mechanism are oppositely arranged on the left and right sides, and the fixing mechanism comprises a first rack, an automatic feeding and discharging device, a workpiece rotating device and a workpiece non-displacement device; the polishing mechanism comprises a polishing base, a polishing table, a polishing rod, a polishing wheel, a high-speed motor, a polishing rod adjusting device and a polishing rod pressure adjusting device, wherein one end of the polishing rod is connected to the output end of the high-speed motor, and the other end of the polishing rod is connected with the polishing wheel; the polishing rod adjusting device comprises a displacement trolley, a servo motor, a first gear, a rack and at least two first turbine elevators, wherein the high-speed motor and the servo motor are fixed on the displacement trolley, the displacement trolley can be placed on the polishing table in a left-right moving mode, the rack is transversely fixed on one side of the polishing table, and the first gear is connected to the output end of the servo motor and is matched with the rack; the first turbine lifter is arranged between the polishing base and the polishing platform, the first turbine lifter which is positioned on the same side of the polishing base achieves synchronous rotation through the connecting rod, the connecting rod is driven by the first motor, and the connecting rod is matched with the first turbine lifter.

Preferably, the polishing rod pressure adjusting device comprises a pressure adjusting cylinder, a first supporting plate, two first supports, a first cross rod, a second cross rod and a first guide rod, wherein the two first supports are fixed on two sides of the first supporting plate, the first cross rod and the second cross rod are both transversely fixed between the two first supports, and the first cross rod and the second cross rod are vertically and separately arranged; a first roller and a second roller are respectively arranged on the first cross bar and the second cross bar, and the polished rod is positioned between the first roller and the second roller; the pressure adjusting cylinder is fixed on the polishing table, and the output end of the pressure adjusting cylinder is connected to the first supporting plate; the first guide rods are fixed to the bottoms of two sides of the first supporting plate, penetrate through the polishing table downwards and extend downwards for a certain length.

Preferably, the automatic feeding and discharging device comprises two groups of feeding and discharging assemblies which are arranged in the first rack from left to right, each group of feeding and discharging assemblies comprises a feeding plate, a feeding cylinder, a material ejecting plate, two material ejecting cylinders, a sliding block and a second guide rod, the two material ejecting cylinders are arranged on two sides of the bottom of the first rack, and the material ejecting plates are connected with output ends of the two material ejecting cylinders; the sliding block is matched with the second guide rod, the second guide rod is fixed on the ejector plate, the feeding plate is fixed above the sliding block, and the output end of the feeding air cylinder is fixedly connected with the feeding plate; the feeding plate is integrally flat-shaped, and one side of the feeding plate is turned upwards.

Preferably, the workpiece rotating device comprises a rotating motor and at least two groups of rotating assemblies, each rotating assembly comprises a transmission rod and two rotating wheels, the transmission rods are transversely and rotatably arranged on the first rack, the two rotating wheels are arranged at two ends of the transmission rods, a second gear is further arranged at one end of each transmission rod, a third gear is arranged between the adjacent rotating assemblies, the third gears are matched with the second gears, and the adjacent rotating assemblies are meshed with the third gears through the second gears to realize linkage; the rotating motor is connected with the transmission rod of one of the rotating assemblies and drives the transmission rod to rotate, and a driven wheel is further arranged on the first rack.

Preferably, the workpiece non-walking device comprises a second turbine elevator, a second supporting plate, a second support, a second motor, a screw rod, a worm gear, an ejector pin, a parallel sliding plate and a guide rail, wherein the second supporting plate is connected to the output end of the second turbine elevator, the screw rod is rotatably arranged on the second supporting plate, one end of the screw rod is connected with the second motor and driven by the second motor to rotate, the worm gear is matched with the screw rod, the parallel sliding plate is fixed on the worm gear, the ejector pin is fixed above the parallel sliding plate through the second support, a sliding block is arranged at the bottom of the parallel sliding plate, and the sliding block is matched with the guide rail.

Preferably, the guide rails are provided with two guide rails which are respectively positioned at two sides of the screw rod.

Preferably, the thimble is in a truncated cone shape as a whole.

Preferably, the top of the first frame is further provided with a material pressing cylinder, an output end of the material pressing cylinder is arranged downwards, and an output end of the material pressing cylinder is provided with a limiting wheel.

Preferably, the water tank and the water pump are further included, the water tank is arranged in the first rack, and the water pump is connected with the water tank through a pipeline.

Compared with the prior art, the technical scheme provided by the invention has the following advantages:

the polishing effect of the inner polishing machine disclosed by the invention is well represented by polishing fineness, uniformity from a pipe orifice to the depth of a steel pipe and mechanically polished patterns, and meanwhile, the problem of labor cost and the problem of dust generated by mechanical polishing are well solved.

Drawings

FIG. 1 is a schematic structural view of an internal polishing machine of the present invention;

FIG. 2 is a schematic view of the construction of a pressure regulating device for a polishing rod;

FIG. 3 is a schematic structural view of a loading and unloading assembly;

FIG. 4 is a schematic structural view of a workpiece rotating apparatus;

FIG. 5 is a schematic structural diagram of a device for preventing a workpiece from moving;

FIG. 6 is an enlarged view of the structure at A in FIG. 1;

fig. 7 is an enlarged schematic view of B in fig. 1.

Reference numerals: 1-a steel pipe, 2-a first frame, 3-a polishing base, 4-a polishing table, 5-a polishing rod, 6-a polishing wheel, 7-a first motor, 8-a high-speed motor, 9-a displacement trolley, 10-a servo motor, 11-a first gear, 12-a rack, 13-a first turbine lifter, 14-a connecting rod, 15-a pressure adjusting cylinder, 16-a first supporting plate, 17-a first bracket, 18-a first cross rod, 19-a second cross rod, 20-a first guide rod, 21-a first roller, 22-a second roller, 23-a feeding cylinder, 24-a material ejecting plate, 25-a material ejecting cylinder, 26-a sliding block, 27-a second guide rod, 28-a rotating motor, 29-a transmission rod, 30-a rotating wheel, 31-a second gear, 32-a third gear, 33-a driven wheel, 34-a second turbine lifter, 35-a second supporting plate, 36-a second bracket, 37-a second motor, 38-a screw rod, 39-a worm gear, 40-a thimble, 41-a parallel sliding plate, 42-a guide rail, 43-a material pressing cylinder, 44-a limiting wheel, 45-a water tank, 46-a water pump and 47-a feeding plate.

Detailed Description

The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.

As shown in fig. 1-7, a steel pipe inner wall polishing machine is shown, which comprises a fixing mechanism for fixing a steel pipe 1 and a polishing mechanism for polishing the inner wall of the steel pipe 1, wherein the fixing mechanism and the polishing mechanism are oppositely arranged on the left and right sides, and the fixing mechanism comprises a first frame 2, an automatic loading and unloading device, a workpiece rotating device and a workpiece non-walking device; the polishing mechanism comprises a polishing base 3, a polishing table 4, a polishing rod 5, a polishing wheel 6, a high-speed motor 8, a polishing rod adjusting device and a polishing rod pressure adjusting device, wherein one end of the polishing rod 5 is connected with the output end of the high-speed motor 8, and the other end of the polishing rod 5 is connected with the polishing wheel 6; the polishing rod adjusting device comprises a displacement trolley 9, a servo motor 10, a first gear 11, a rack 12 and at least two first turbine elevators 13, wherein the high-speed motor 8 and the servo motor 10 are fixed on the displacement trolley 9, the displacement trolley 9 is placed on the polishing table 4 in a manner of moving left and right, the rack 12 is transversely fixed on one side of the polishing table 4, and the first gear 11 is connected to the output end of the servo motor 10 and is matched with the rack 12; the first turbine lifter 13 is arranged between the polishing base 3 and the polishing table 4, the first turbine lifter 13 positioned on the same side of the polishing base 3 synchronously rotates through a connecting rod 14, the connecting rod 14 is driven by a first motor 7, and the connecting rod 14 is matched with the first turbine lifter 13.

In the structure, the automatic loading and unloading device is used for conveying the steel pipe 1 to the station, the workpiece rotating device is used for driving the steel pipe 1 to rotate, and the workpiece non-walking device is used for preventing the steel pipe 1 from jumping up and down or moving back and forth in the polishing process.

The high-speed motor 8 drives the polishing rod 5 to rotate, and the polishing rod 5 drives the polishing wheel 6 to roll to mechanically polish the inner wall of the steel pipe 1. In the embodiment, the rotating speed of the high-speed motor 8 can reach more than 7000 revolutions, so that the grinding capacity of the polishing wheel 6 is improved, and the polishing effect is better.

The working principle of the polishing rod adjusting device is as follows: the servo motor 10 drives the first gear 11 to rotate, and the first gear 11 is meshed with the rack 12, so that the displacement trolley 9 can move left and right on the polishing table 4; at the same time, the first turbo lifter 13 may drive the polishing table 4 to ascend or descend. In this embodiment, six first turbine lifters 13 are specifically provided, and are respectively provided at four corners of the bottom of the polishing table 4 and on both sides of the middle section of the bottom of the polishing table 4. The first turbine lifter 13 on the same side is synchronously rotated through the connecting rod 14, and the connecting rod 14 is driven to rotate by the first motor 7. It will be appreciated that the first motor 7 has two coaxial outputs for driving the links 14 on both sides to rotate synchronously.

Furthermore, the polishing rod pressure adjusting device comprises a pressure adjusting cylinder 15, a first supporting plate 16, two first supports, a first cross bar 18, a second cross bar 19 and a first guide rod 20, wherein the two first supports are fixed on two sides of the first supporting plate 16, the first cross bar 18 and the second cross bar 19 are both transversely fixed between the two first supports, and the first cross bar 18 and the second cross bar 19 are vertically and separately arranged; a first roller 21 and a second roller 22 are respectively arranged on the first cross bar 18 and the second cross bar 19, and the polished rod 5 is positioned between the first roller 21 and the second roller 22; the pressure adjusting cylinder 15 is fixed on the polishing table 4, and the output end of the pressure adjusting cylinder 15 is connected to the first supporting plate 16; the first guide rods 20 are fixed to the bottoms of both sides of the first carrier plate 16, and the first guide rods 20 pass through the polishing table 4 downward and extend downward by a certain length. Wherein the first guide bar 20 guides and limits the first supporting plate 16, so that the first supporting plate 16 can only move vertically.

The working principle of the polishing rod pressure adjusting device is as follows: the pressure adjusting cylinder 15 drives the first supporting plate 16 to move downwards, the first carriage drives the rollers on the first cross rod 18 and the second cross rod 19 to move downwards, and the first roller 21 on the first cross rod 18 applies downward pressure to the polishing rod 5; similarly, the pressure adjusting cylinder 15 drives the first supporting plate 16 to move upward, the first carriage drives the rollers on the first cross bar 18 and the second cross bar 19 to move upward, and the second roller 22 on the second cross bar 19 applies upward pressure to the polishing rod 5.

When the polishing rod 5 just enters the position of the pipe orifice, the pressure adjusting device of the polishing rod can well adjust the contact force between the polishing wheel 6 and the closed part, so that the effects of the polishing surface from the pipe orifice to the depth of the steel pipe 1 are consistent; and simultaneously, the polished rod 5 can be better stabilized due to the pressure application.

Furthermore, the automatic loading and unloading device comprises two groups of loading and unloading assemblies which are arranged in the first rack 2 from left to right, wherein each group of loading and unloading assemblies comprises a feeding plate 47, a feeding cylinder 23, an ejecting plate 24, two ejecting cylinders 25, a sliding block 26 and a second guide rod 27, the two ejecting cylinders 25 are arranged on two sides of the bottom of the first rack 2, and the ejecting plate 24 is connected with output ends of the two ejecting cylinders 25; the slide block 26 is matched with the second guide rod 27, the second guide rod 27 is fixed on the ejector plate 24, the feeding plate 47 is fixed above the slide block 26, and the output end of the feeding cylinder 23 is fixedly connected with the feeding plate 47; the feeding plate 47 is integrally flat, and one side of the feeding plate 47 is turned upwards.

The workpiece rotating device comprises a rotating motor 28 and at least two groups of rotating assemblies, each rotating assembly comprises a transmission rod 29 and two rotating wheels 30, the transmission rod 29 is transversely and rotatably arranged on the first rack 2, the two rotating wheels 30 are arranged at two ends of the transmission rod 29, one end of the transmission rod 29 is also provided with a second gear 31, a third gear 32 is arranged between the adjacent rotating assemblies, the third gear 32 is matched with the second gear 31, and the adjacent rotating assemblies are meshed with the third gear 32 through the second gear 31 to realize linkage; the rotating motor 28 is connected with the transmission rod 29 of one of the rotating assemblies and drives the transmission rod 29 to rotate, and the first frame 2 is further provided with a driven wheel 33.

The working principle of the workpiece rotating device is as follows: in the embodiment, the rotating assemblies are specifically arranged into three groups, wherein the rotating motor 28 is connected with the transmission rod 29 of the middle rotating assembly, the rotating motor 28 drives the transmission rod 29 of the middle rotating assembly, the transmission rod 29 drives the second gear 31 of the rotating assembly to rotate, and the second gear 31 drives the third gears 32 arranged at two sides of the second gear to further drive the second gears 31 of the rotating assemblies at two sides to rotate; the second gears 31 on the two sides respectively drive the transmission rods 29 of the self-rotating assemblies to rotate, and the transmission rods 29 drive the rotating wheels 30 to rotate; the rotating wheel 30 further rotates the steel pipe 1.

Furthermore, the workpiece non-walking device comprises a second turbine lifter 34, a second supporting plate 35, a second bracket 36, a second motor 37, a screw rod 38, a worm wheel 39, a thimble 40, a parallel sliding plate 41 and a guide rail 42, wherein the second supporting plate 35 is connected to the output end of the second turbine lifter 34, the screw rod 38 is rotatably arranged on the second supporting plate 35, one end of the screw rod 38 is connected with the second motor 37 and is driven by the second motor 37 to rotate, the worm wheel 39 is matched with the screw rod 38, the parallel sliding plate 41 is fixed on the worm wheel 39, the thimble 40 is fixed above the parallel sliding plate 41 through the second bracket 36, a sliding block 26 is arranged at the bottom of the parallel sliding plate 41, and the sliding block 26 is matched with the guide rail 42. Furthermore, a material pressing cylinder 43 is further arranged at the top of the first frame 2, an output end of the material pressing cylinder 43 is arranged downwards, and an output end of the material pressing cylinder is provided with a limiting wheel 44.

The working principle of the workpiece non-displacement device is as follows: a belt pulley is arranged on the second motor 37, a belt pulley is also arranged on the screw rod 38, the second motor 37 drives the belt pulley to serve as a driving wheel to drive the driven wheel 33 of the screw rod 38 to rotate, and the worm wheel 39 on the screw rod 38 moves back and forth along with the positive and negative rotation of the screw rod 38; when the worm wheel 39 moves forward, the second supporting plate 35 on the worm wheel 39 drives the ejector pin 40 to move forward, the ejector pin 40 abuts against the tail part of the steel pipe 1, the rotating motor 28 stops, and the steel pipe 1 is abutted and does not move. At this time, the pressing cylinder is extended downward, so that the stopper wheel 44 presses the steel pipe 1.

More specifically, in the present embodiment, two guide rails 42 are provided and are respectively located at two sides of the screw rod 38; the thimble 40 is shaped like a truncated cone as a whole.

Furthermore, the water tank 45 and the water pump 46 are included, the water tank 45 is arranged in the first frame 2, and the water pump 46 is connected with the water tank 45 through a pipeline.

In this embodiment, two water tanks 45 are provided, which are respectively located at a position near the front end and a position near the rear end of the first frame 2. Water is taken in a near place according to the position where the steel pipe 1 is polished. When the steel pipe 1 is polished, the water pump 46 pumps water from the water tank 45 and sends the water to the steel pipe 1 for polishing, and the polishing wheel 6 and the steel pipe 1 are cooled and dedusted. The steel pipe 1 is not deformed by the high temperature generated by the contact grinding of the polishing wheel 6 and the inner wall of the steel pipe 1.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The functional and structural principles of the present invention may be modified at will without departing from the principles set forth above.