CN111975489B

CN111975489B - Metal grinding device

Info

Publication number: CN111975489B
Application number: CN202010873186.7A
Authority: CN
Inventors: 苏宁
Original assignee: LANGUAN ELECTRONIC TECHNOLOGY CO LTD
Current assignee: LANGUAN ELECTRONIC TECHNOLOGY Co.,Ltd.
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-10-01
Anticipated expiration: 2040-08-26
Also published as: CN111975489A

Abstract

The invention provides a metal grinding device, which comprises a workbench, wherein a rotating shaft is arranged on the workbench, the rotating shaft is movably connected with the workbench and can axially rotate, the upper end and the lower end of the rotating shaft protrude out of the surface of the workbench, an outer wall grinding mechanism is arranged at the upper end, a rocker is connected at the lower end and extends to the outer edge of the workbench, a handle is connected at the tail end, a group of fixing rings which are mutually and vertically arranged are arranged at the positions of the upper surface of the workbench, which are positioned at the two sides of the outer wall grinding mechanism, and inner wall grinding mechanisms are arranged at the two ends of the fixing rings. Has good development prospect.

Description

Metal grinding device

Technical Field

The invention relates to the field of metal pipe machining, in particular to a metal polishing device.

Background

The metal pipe is a common fitting used in various daily used mechanical devices, and the metal pipe needs to be processed according to actual requirements before use. Bending is a common processing treatment for the pipe, but in the bending process, the inner side of the metal pipe is shortened by tangential compressive stress to thicken the inner pipe wall, so that the inner pipe wall and the outer pipe wall of a bending deformation area of the pipe are wrinkled. For some pipes with requirements on sealing performance or assembly accuracy, a common mode is to polish the inner and outer pipe walls in a bending deformation area and grind surface wrinkles.

But traditional grinding device can't laminate the curved surface structure of outer wall department of buckling well, leads to polishing inefficiency, polishing effect inhomogeneous, can't visit in the tubular metal resonator simultaneously and polish to the fold of inner wall.

Disclosure of Invention

The invention aims to provide a polishing device which can be tightly attached to the inner wall and the outer wall of a metal pipe to efficiently polish wrinkles at a bent part.

In order to achieve the purpose, the invention provides the following technical scheme:

a metal polishing device comprises a workbench, wherein a rotating shaft is arranged on the workbench and movably connected with the workbench and can axially rotate, the upper end and the lower end of the rotating shaft protrude out of the surface of the workbench, an outer wall polishing mechanism is arranged at the upper end of the rotating shaft, a rocker is connected at the lower end of the rotating shaft and extends to the outer edge of the workbench, a handle is connected at the tail end of the rotating shaft, a group of fixing rings which are vertically arranged are arranged at the positions, located at the two sides of the outer wall polishing mechanism, on the upper surface of the workbench, and inner wall polishing mechanisms are arranged at the two ends of the fixing rings;

the outer wall polishing mechanism comprises a shell, a hydraulic push rod, a mounting frame, guide wheels, a first driving motor and a polishing belt, wherein the shell is fixedly connected to the upper end of the rotating shaft, the hydraulic push rod is transversely arranged in the shell, the front end of the hydraulic push rod is connected with the mounting frame, the first driving motor is arranged on one side of the mounting frame, the front end of the mounting frame is provided with a pair of guide wheels, and the polishing belt is arranged on the outer sides of the guide wheels and a driving wheel of the first driving motor;

the inner wall polishing mechanism comprises a winding wheel, a cable, polishing blocks and a second driving motor, the winding wheel and the second driving motor are respectively arranged at the edge positions of the workbench corresponding to the two fixing rings, the tail end of the cable is wound on the winding wheel, the front end of the cable is movably connected with the second driving motor, and the cable is provided with the polishing blocks.

As a further scheme of the invention: the workstation includes the plate body, falls dirt groove and spout, and the one corner of plate body is opened there is the dirt groove that falls, and the dirt groove that falls extends to the pivot mounted position from the plate body edge, and the plate body lower surface is provided with the spout, and the both ends in the dirt groove that falls are connected respectively at the spout both ends, and the spout is the arc metal pocket, center pin and pivot center pin coincidence.

As a further scheme of the invention: the rocker comprises a rod body, a guide block and an oil liquid channel, the rod body is U-shaped, is hollow inside and is provided with the oil liquid channel, one end of the rod body is fixedly connected to the bottom surface of the rotating shaft, the tail end of the rod body is provided with a handle, the inner side of the handle is provided with a hydraulic bag, the middle section of the rod body is provided with the guide block, and the guide block is inserted into the sliding groove structure of the workbench.

As a further scheme of the invention: one end of the oil liquid channel is communicated with the hydraulic push rod, the other end of the oil liquid channel is connected with the hydraulic bag in the handle, the bottom side of the handle is movably connected with a pressing handle, the pressing handle can rotate towards the inner side of the handle along a joint to press the hydraulic bag structure, and the joint is provided with a torsional spring to fix the initial angle of the pressing handle.

As a further scheme of the invention: the hydraulic push rod comprises a hydraulic cavity, a piston rod and a reset spring, the hydraulic cavity is fixed in the shell, the piston rod capable of transversely extending out is arranged in the hydraulic cavity, the piston rod divides the hydraulic cavity into two cavities, the reset spring is arranged between the piston rod and the inner wall of the hydraulic cavity in the cavity on the extending side of the piston rod, the reset spring is a pressure spring, and the cavity on the extending side of the piston rod is far away from is communicated with the hydraulic bag through an oil liquid channel.

As a further scheme of the invention: the surface of the guide wheel is of a protruding curved surface structure, protruding extension structures are arranged on the edges of the two sides of the guide wheel, and a groove structure is arranged on the mounting frame corresponding to the position between the two guide wheels.

As a further scheme of the invention: the front end of a rotating shaft of the second driving motor is provided with a transmission end, the head end of the cable is fixedly provided with a connection end, the connection end is a metal piece with a small end and a big end, the outer side of the connection end is provided with a thread structure, the cable is in threaded connection with the transmission end through the connection end and is in transmission connection with the second driving motor, and the rotation direction of the second driving motor is consistent with the screwing direction of the connection end.

As a further scheme of the invention: the grinding block is of a cylindrical structure, is fixed on a cable at equal intervals, an 8-shaped ring is arranged on the outer side of the grinding block closest to one end of the winding wheel and connected on the cable in series, the 8-shaped ring is composed of two sections of structures, the two sections of structures are connected in a rotating mode, and the cable is connected to the end heads of the two sides of the 8-shaped ring respectively.

As a further scheme of the invention: the second driving motor and the winding wheel are arranged in a deviating mode in the extending direction of the fixing ring, and the second driving motor and the winding wheel are arranged in a deviating mode in the bending side direction of the metal pipe.

As a further scheme of the invention: the fixed ring comprises an upper ring, a lower ring and a butterfly nut, the upper ring and the lower ring are movably connected through a hinge on one side, the lower ring is of an incomplete ring structure larger than 180 degrees, the upper ring is composed of two parts of structures, one part of the structure is complementary with the lower ring to form the complete ring structure, the other part of the structure is connected to the upper surface of the tail end of the complementary part and covers the lower ring structure, the upper ring and the lower ring structure are in stepped ring structures at two ends larger than 180 degrees, and the superposition position of the upper ring and the lower ring structure is provided with the upper ring and the lower ring structure in a thread fixed connection with the butterfly nut.

Advantageous effects

1. The outer wall grinding mechanism and the inner wall grinding mechanism are arranged on the workbench, and are used for grinding and polishing the folds generated on the inner side and the outer side of the thickened pipe wall of the inner side due to the fact that the inner side of the bent metal pipe is shortened by tangential compressive stress after the bent metal pipe is bent, so that the surface precision of the pipe wall at the bent position is improved, and the requirement of the pipe on the surface precision is met.

2. The outer wall polishing mechanism is fixed on the rotating shaft, the angle of the outer wall polishing mechanism can be adjusted through a rocker at the bottom of the rotating shaft, the polishing width is improved, and fixed points can be polished in a targeted mode through adjusting the angle so as to adapt to different wrinkle degrees of different parts.

3. The front end polishing belt of the outer wall polishing mechanism disclosed by the invention controls the position through the hydraulic push rod to realize the attachment and detachment with the pipe wall, and the hydraulic push rod is controlled through the pressing handle at the tail end of the rocker, so that the lower pressure degree of the polishing belt is conveniently controlled, the operation is simple and convenient, and the polishing degree is conveniently controlled.

4. The surface of the guide wheel is of a convex cambered surface structure, so that the polishing belt attached to the pipe wall is in a cambered surface state, the curved surface structure attached to the pipe wall can be more favorable, the contact area is increased, the small polishing area and the non-uniform polishing effect caused by the fact that only two sides of the polishing belt are attached to the pipe wall are avoided, and the groove structure is arranged on the mounting frame corresponding to the position between the two guide wheels, so that the polishing belt is pressed down to form a cambered surface to be more attached to the pipe wall curved surface.

5. According to the inner wall polishing mechanism, the cable wires are provided with the polishing blocks at equal intervals, after the winding wheel is tightened, the polishing blocks are integrally formed into an arc-shaped structure, the inner wall of the metal pipe is attached, the inner wall of the metal pipe is polished through the driving of the second driving motor, the attaching degree is high, the polishing effect is good, one side of the inner wall polishing mechanism is provided with the 8-shaped ring, the transmission of the second driving motor to the cable wires at the winding wheel section can be offset through the 8-shaped ring, and the cable wires at the end of the winding wheel are prevented from being continuously twisted and broken.

6. According to the invention, the second driving motor and the winding wheel are arranged in a manner of offsetting towards the bending side of the metal pipe, so that the cable forms an acute angle structure on the metal pipe, the grinding blocks at two ends are more attached to the inner wall of the edge of the bending part, and the grinding effect is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of an outer wall grinding mechanism of the present invention.

Figure 3 is a cross-sectional view of an outer wall grinding mechanism of the present invention.

Fig. 4 is a schematic structural view of the guide wheel of the present invention.

Fig. 5 is a schematic structural view of the inner wall polishing mechanism of the present invention.

FIG. 6 is an enlarged view of the structure at A of FIG. 5 according to the present invention.

FIG. 7 is an enlarged view of the structure at B of FIG. 5 according to the present invention.

Fig. 8 is a sectional view of the structure of the fixing ring of the present invention.

In FIGS. 1-8: 1-workbench, 101-plate body, 102-dust falling groove, 103-sliding groove, 2-rotating shaft, 3-outer wall polishing mechanism, 4-shell, 5-hydraulic push rod, 501-hydraulic cavity, 502-piston rod, 503-return spring, 6-mounting rack, 7-guide wheel, 8-first driving motor, 9-polishing belt, 10-rocker, 1001-rod body, 1002-guide block, 1003-oil channel, 11-grip, 12-press handle, 13-hydraulic bag, 14-fixing ring, 1401-upper ring, 1402-lower ring, 1403-butterfly nut, 15-inner wall polishing mechanism, 16-winding wheel, 17-cable, 18-polishing block, 19-8-shaped ring, 20-connecting end, 21-a transmission end head, 22-a second driving motor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the word "comprising" or "comprises", and the like, in this disclosure is intended to mean that the elements or items listed before that word, include the elements or items listed after that word, and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Referring to fig. 1-8, in an embodiment of the present invention, a metal polishing apparatus includes a worktable 1, a plate 101, a dust falling groove 102, a sliding groove 103, a rotating shaft 2, an outer wall polishing mechanism 3, a housing 4, a hydraulic push rod 5, a hydraulic chamber 501, a piston rod 502, a return spring 503, an installation frame 6, a guide wheel 7, a first driving motor 8, a polishing belt 9, a rocker 10, a rod 1001, a guide block 1002, an oil passage 1003, a grip 11, a press handle 12, a hydraulic bag 13, a fixing ring 14, an upper ring 1401, a lower ring 1402, a butterfly nut 1403, an inner wall polishing mechanism 15, a winding wheel 16, a cable 17, a polishing block 18, an 8-shaped ring 19, a connection end 20, a transmission end 21, and a second driving motor 22, the worktable 1 is provided with the rotating shaft 2, the rotating shaft 2 is movably connected to the worktable 1, and can axially rotate, the upper and lower ends of the rotating shaft 2 protrude out of the surface of the worktable 1, and the upper end is provided with the outer wall polishing mechanism 3, the lower end of the worktable 1 is connected with a rocker 10, the rocker 10 extends to the outer edge of the worktable 1, the tail end of the worktable is connected with a handle 11, a group of fixing rings 14 which are vertically arranged are arranged on the upper surface of the worktable 1 at the two sides of the outer wall polishing mechanism 3, and two ends of each fixing ring 14 are provided with inner wall polishing mechanisms 15;

the outer wall polishing mechanism 3 comprises a shell 4, a hydraulic push rod 5, an installation frame 6, guide wheels 7, a first driving motor 8 and a polishing belt 9, the shell 4 is fixedly connected to the upper end of the rotating shaft 2, the hydraulic push rod 5 is transversely arranged in the shell 4, the installation frame 6 is connected to the front end of the hydraulic push rod 5, the first driving motor 8 is arranged on one side of the installation frame 6, the pair of guide wheels 7 is arranged at the front end of the installation frame 6, and the polishing belt 9 is arranged on the outer sides of the guide wheels 7 and a driving wheel of the first driving motor 8;

the inner wall polishing mechanism 15 comprises a winding wheel 16, a cable 17, polishing blocks 18 and a second driving motor 22, the winding wheel 16 and the second driving motor 22 are respectively arranged at the edge positions of the workbench 1 corresponding to the two fixing rings 14, the tail end of the cable 17 is wound on the winding wheel 16, the front end of the cable is movably connected with the second driving motor 22, and the cable 17 is provided with the polishing blocks 18.

Wherein: metal grinding device, its characterized in that: workstation 1 includes plate body 101, dust falling groove 102 and spout 103, dust falling groove 102 has been opened in one corner of plate body 101, dust falling groove 102 extends to 2 mounted positions of pivot from plate body 101 edge, plate body 101 lower surface is provided with spout 103, the both ends in dust falling groove 102 are connected respectively at spout 103 both ends, spout 103 is the arc metal pocket, the center pin coincides with 2 center pin of pivot, through setting up dust falling groove 102, can avoid the metal fillings that polish the production to pile up, also be convenient for observe the position of polishing.

Wherein: the rocker 10 comprises a rod body 1001, a guide block 1002 and an oil passage 1003, the rod body 1001 is U-shaped and hollow, the oil passage 1003 is arranged, one end of the rod body 1001 is fixedly connected to the bottom surface of the rotating shaft 2, the tail end of the rod body 1001 is provided with a handle 11, the inner side of the handle 11 is provided with a hydraulic bag 13, the guide block 1002 is arranged at the middle section of the rod body 1001, the guide block 1002 stretches into the sliding groove 103 structure of the workbench 1, and the guide block 1002 is matched with the sliding groove 103 to play a role in guiding the movement of the rocker 10.

Wherein: one end of the oil liquid channel 1003 is communicated with the hydraulic push rod 5, the other end of the oil liquid channel 1003 is connected with a hydraulic bag 13 in the handle 11, the bottom side of the handle 11 is movably connected with a pressing handle 12, the pressing handle 12 can rotate towards the inner side of the handle 11 along a joint to press the structure of the hydraulic bag 13, the joint is provided with a torsion spring to fix the initial angle of the pressing handle 12, the hydraulic bag 13 is extruded through the pressing handle 12, oil liquid in the hydraulic bag 13 enters the hydraulic push rod 5, and the purpose of controlling the hydraulic push rod 5 to stretch is achieved.

Wherein: the hydraulic push rod 5 comprises a hydraulic cavity 501, a piston rod 502 and a return spring 503, the hydraulic cavity 501 is fixed inside the housing 4, the piston rod 502 capable of transversely extending out is arranged inside the hydraulic cavity 501, the piston rod 502 divides the hydraulic cavity 501 into two chambers, the return spring 503 is arranged between the piston rod 502 and the inner wall of the hydraulic cavity 501 in the chamber on the extending side of the piston rod 502, the return spring 503 is a pressure spring, the chamber on the extending side far away from the piston rod 502 is communicated with the hydraulic bag 13 through an oil passage 1003, the oil in the hydraulic bag 13 enters the hydraulic push rod 5 to drive the hydraulic push rod 5 to extend out, so that the polishing belt 9 moves to gradually adhere to the curved surface of the pipe wall of the metal pipe to polish the pipe wall, after the pressing handle 12 is loosened, the piston rod 502 retracts under the action of the return spring 503, and the polishing belt 9 is separated from the oil in the hydraulic bag 13 to be reset.

Wherein: the surface of the guide wheel 7 is of a protruding curved surface structure, protruding extension structures are arranged on the edges of the two sides, a groove structure is arranged on the mounting frame 6 corresponding to the position between the two guide wheels 7, the grinding belt 9 is convenient to press down to form a curved surface, the curved surface is more attached to the pipe wall, and the contact area is increased.

Wherein: the front end of a rotating shaft of the second driving motor 22 is provided with a transmission end 21, the head end of the cable 17 is fixed with a connection end 20, the connection end 20 is a metal piece with a small end and a big end, the outer side of the connection end is provided with a thread structure, the cable 17 is in threaded connection with the transmission end 21 through the connection end 20 and the transmission end 22, the rotation direction of the second driving motor 22 is consistent with the screwing direction of the connection end 20, the small end and the big end of the connection end 20 are convenient to pass through the metal pipe, the transmission end 21 is connected and then the cable 17 is driven to rotate through the second driving motor 22, and therefore the inner wall of the metal pipe is polished by the polishing block 18.

Wherein: the grinding blocks 18 are of a cylindrical structure and are fixed on the cable 17 at equal intervals, 8-shaped rings 19 are connected in series on the cable 17 on the outer side of the grinding block 18 closest to one end of the winding wheel 16, each 8-shaped ring 19 is composed of two sections of structures, the two sections of structures are connected in a rotating mode, the cable 17 is connected to the end positions of the two sides of each 8-shaped ring 19 respectively, transmission of the second driving motor 22 to the cable 17 of the winding wheel 16 can be offset through the 8-shaped rings, and continuous twisting and breaking of the cable 17 at the end of the winding wheel 16 are avoided.

Wherein: second driving motor 22 and winding wheel 16 all with the skew setting of solid fixed ring 14 extending direction, second driving motor 22 and winding wheel 16 are to the skew setting of tubular metal resonator bending side for cable 17 forms the acute angle structure at the tubular metal resonator, and the marginal inner wall of the department of buckling is laminated more to both ends sanding block 18, improves the effect of polishing.

Wherein: the fixing ring 14 comprises an upper ring 1401, a lower ring 1402 and a butterfly nut 1403, the upper ring 1401 and the lower ring 1402 are movably connected through a hinge on one side, the lower ring 1402 is an incomplete ring structure larger than 180 degrees, the upper ring 1401 is composed of two parts, one part is complementary with the lower ring 1402 structure to form a complete ring structure, the other part is connected to the upper surface of the tail end of the complementary part and covers part of the lower ring 1402 structure, the lower ring is a two-end stepped ring structure larger than 180 degrees, the butterfly nut 1403 is arranged at the overlapped position of the upper ring 1401 and the lower ring 1402 structure in a threaded fixed connection mode, the upper ring 1401 and the lower ring 1402 structure are fixedly connected through the butterfly nut 1403, and through the structural angle, larger than 180 degrees, of the lower ring 1402 and the upper ring 1401, the metal pipe and the lower ring 1402 can be clamped respectively, and the stability of fixing the metal pipe is improved.

When the device is used, the connecting end 20 is plugged into one side of a metal pipe and taken out from the other side, the cable 17 passes through the metal pipe under the traction of the connecting end 20, the connecting end 20 is connected with the transmission end 21 on the second driving motor 22 through screwing threads, the redundant cable 17 is wound and tightened under the action of the winding wheel 16, the fixing ring 14 is opened, the metal pipe is clamped, the fixing ring 14 is sealed, the fixing is carried out by screwing the butterfly nut 1403, the device is started, the first driving motor 8 and the second driving motor 22 operate to respectively drive the grinding belt 9 and the cable 17 to move with the grinding block 18, the grinding block 18 polishes the inner wall of the metal pipe, the handle 12 is pressed by holding the handle 11, oil in the hydraulic bag 13 is extruded into the hydraulic push rod 5 to drive the hydraulic push rod 5 to extend out, so that the grinding belt 9 moves to gradually attach to the curved surface of the wall of the metal pipe, the pipe wall is polished by controlling the angle of the handle, after the pressure handle 12 is released, the piston rod 502 is retracted under the action of the return spring 503, the grinding belt 9 is separated from the surface of the metal pipe, oil is guided back into the hydraulic bag 13, the device is closed, and the metal pipe is taken out.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several variations and modifications without departing from the concept of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.

Claims

1. A metal polishing device comprises a workbench (1), and is characterized in that a rotating shaft (2) is arranged on the workbench (1), the rotating shaft (2) is movably connected with the workbench (1) and can axially rotate, the upper end and the lower end of the rotating shaft (2) protrude out of the surface of the workbench (1), an outer wall polishing mechanism (3) is installed at the upper end, a rocker (10) is connected at the lower end, the rocker (10) extends to the outer edge of the workbench (1), the tail end of the rocker is connected with a handle (11), a group of fixing rings (14) which are vertically arranged are arranged at positions of the upper surface of the workbench (1) at two sides of the outer wall polishing mechanism (3), and inner wall polishing mechanisms (15) are arranged at two ends of the fixing rings (14);

the outer wall polishing mechanism (3) comprises a shell (4), a hydraulic push rod (5), a mounting frame (6), guide wheels (7), a first driving motor (8) and a polishing belt (9), the shell (4) is fixedly connected to the upper end of the rotating shaft (2), the hydraulic push rod (5) is transversely arranged in the shell (4), the front end of the hydraulic push rod (5) is connected with the mounting frame (6), the first driving motor (8) is arranged on one side of the mounting frame (6), a pair of guide wheels (7) is arranged at the front end of the mounting frame (6), and the polishing belt (9) is arranged on the outer sides of the guide wheels (7) and a driving wheel of the first driving motor (8);

inner wall grinding machanism (15) include wind-up pulley (16), cable (17), sanding block (18) and second driving motor (22), wind-up pulley (16) and second driving motor (22) set up respectively in workstation (1) border position that two solid fixed rings (14) correspond, and the tail end rolling of cable (17) is on wind-up pulley (16), front end and second driving motor (22) swing joint, set up a plurality of sanding blocks (18) on cable (17).

2. A metal grinding apparatus as defined in claim 1, wherein: workstation (1) is including plate body (101), dust falling groove (102) and spout (103), and one corner of plate body (101) is opened has dust falling groove (102), and dust falling groove (102) extend to pivot (2) mounted position from plate body (101) edge, and plate body (101) lower surface is provided with spout (103), and the both ends in dust falling groove (102) are connected respectively at spout (103) both ends, and spout (103) are the arc metal slot, center pin and pivot (2) center pin coincidence.

3. A metal grinding apparatus as defined in claim 1, wherein: the rocker (10) comprises a rod body (1001), a guide block (1002) and an oil passage (1003), wherein the rod body (1001) is U-shaped, the interior of the rod body is hollow and is provided with the oil passage (1003), one end of the rod body (1001) is fixedly connected to the bottom surface of the rotating shaft (2), the tail end of the rod body is provided with a handle (11), the inner side of the handle (11) is provided with a hydraulic bag (13), the middle section of the rod body (1001) is provided with the guide block (1002), and the guide block (1002) stretches into the structure of the sliding groove (103) of the workbench (1).

4. A metal grinding apparatus as defined in claim 3, wherein: one end of the oil liquid channel (1003) is communicated with the hydraulic push rod (5), the other end of the oil liquid channel is connected with a hydraulic bag (13) in the handle (11), the bottom side of the handle (11) is movably connected with a pressing handle (12), the pressing handle (12) can rotate towards the inner side of the handle (11) along a joint to press the structure of the hydraulic bag (13), and the joint is provided with a torsion spring to fix the initial angle of the pressing handle (12).

5. A metal grinding apparatus as defined in claim 1, wherein: the hydraulic push rod (5) comprises a hydraulic cavity (501), a piston rod (502) and a return spring (503), the hydraulic cavity (501) is fixed inside the shell (4), the piston rod (502) capable of transversely extending out is arranged inside the hydraulic cavity (501), the piston rod (502) divides the hydraulic cavity (501) into two cavities, the return spring (503) is arranged between the piston rod (502) and the inner wall of the hydraulic cavity (501) in the cavity on the extending side of the piston rod (502), the return spring (503) is a pressure spring, and the cavity on the extending side away from the piston rod (502) is communicated with the hydraulic bag (13) through an oil liquid channel (1003).

6. A metal grinding apparatus as defined in claim 1, wherein: the surfaces of the guide wheels (7) are of protruded curved surface structures, protruded extension structures are arranged on the edges of the two sides, and a groove structure is arranged on the mounting rack (6) corresponding to the position between the two guide wheels (7).

7. A metal grinding apparatus as defined in claim 1, wherein: the front end of a rotating shaft of the second driving motor (22) is provided with a transmission end (21), the head end of the cable (17) is fixed with a connection end (20), the connection end (20) is a metal piece with a small head and a big tail, the outer side of the connection end is provided with a thread structure, the cable (17) is in threaded connection with the transmission end (21) through the connection end (20) and is in transmission connection with the second driving motor (22), and the rotation direction of the second driving motor (22) is consistent with the screwing direction of the connection end (20).

8. A metal grinding apparatus as defined in claim 1, wherein: the polishing blocks (18) are of a cylindrical structure and are fixed on the cable (17) at equal intervals, 8-shaped rings (19) are connected in series on the cable (17) on the outer side of the polishing blocks (18) closest to one end of the winding wheel (16), the 8-shaped rings (19) are composed of two sections of structures which are connected in a rotating mode, and the cable (17) is connected to the end positions of the two sides of the 8-shaped rings (19) respectively.

9. A metal grinding apparatus as defined in claim 1, wherein: the second driving motor (22) and the winding wheel (16) are arranged in a deviating mode in the extending direction of the fixing ring (14), and the second driving motor (22) and the winding wheel (16) are arranged in a deviating mode towards the bending side of the metal pipe.

10. A metal grinding apparatus as defined in claim 1, wherein: fixed ring (14) are including going up ring (1401), lower ring (1402) and butterfly nut (1403), go up ring (1401) and lower ring (1402) through the hinge swing joint of one side, lower ring (1402) are for being greater than 180 incomplete ring structure, it comprises two part structures to go up ring (1401), one part is complementary with lower ring (1402) structure and forms complete ring structure, another part is connected at complementary partial tail end upper surface and covers partial lower ring (1402) structure, for the cascaded ring structure in both ends that is greater than 180, it is provided with butterfly nut (1403) screw thread fixed connection and goes up ring (1401) and lower ring (1402) structure to go up ring (1401) and lower ring (1402) structure coincide department.