Portable rapid pipe grinding machine

Abstract

A plurality of grinding wheels are driven to rotate through a grinding motor, the centers of the multiple grinding wheels are arranged in an arc shape, so that a grinding brush can efficiently work on the surface of a pipe, a handle is lifted to rotate along the pipe in a small range, and then the pipe can be ground within the range of 180 degrees; and after one face is polished, the pipe is rotated, other parts are polished through the polishing machine again, and the outer surface of the pipe can be completely polished. The polishing machine is small in size, convenient to move, capable of polishing in multiple directions at the same time, high in polishing efficiency and uniform and consistent in polishing quality. The pipe polishing device is characterized in that the pipe polishing device comprises a supporting structure and a polishing structure, the supporting structure is of a semicircular structure and can be tightly attached to the radian of the surface of a polished pipe, uniform material removal and consistent polishing thickness can be achieved, the polishing structure comprises a plurality of polishing wheels, and the polishing wheels are arranged on the supporting structure.

Description

Technical Field

[0001] The present invention discloses a portable rapid pipe grinding machine, which relates to a grinding machine that can be easily moved in multiple directions and grind pipes at the same time, and belongs to the technical field of mechanical grinding, and particularly relates to a grinding machine that drives a main gear to rotate by a motor, and then drives a grinding wheel to rotate at high speed by means of the meshing relationship between the main gear and a slave gear. By holding a handle, the device can be easily moved so as to fully grind the pipe. Background Art

[0002] In the field of building materials, pipes are widely used, especially in outdoor projects. Since pipes are often exposed to the external environment, their outer walls are easily affected by environmental factors, such as the adhesion of spray paint and the formation of rust. These problems not only damage the appearance of the pipes, but also cause continuous damage to their performance. In order to maintain the quality of pipes and extend their service life, surface grinding has become a necessary maintenance method to remove impurities and defects on the surface and provide a good foundation for subsequent protective measures such as painting or plating. There are two main traditional methods for grinding the outer wall of pipes: using large grinding machines or small handheld grinders. However, both methods have certain limitations. Large grinding machines, such as a pipe internal and external grinding device applied for by the applicant in another case, have fast grinding speed, but are inconvenient to carry due to their large size, and the pipes need to be moved to the machine for processing, which not only increases labor intensity but also reduces work efficiency. On the other hand, although small grinders are easy to move, they can usually only grind one horizontal surface. In actual operation, the grinding angle needs to be constantly adjusted, which makes the grinding efficiency relatively low and it is difficult to ensure the uniformity and quality of grinding.

[0003] Announcement No. CN113319662A discloses a pipe outer wall grinding device, including an adjustment platform bed, a fixed pipe clamping frame, a movable pipe clamping frame, a power-connected pipe clamping structure, a movable pipe clamping structure, a spliced ​​pipe outer wall grinding roller, and a movable grinding adjustment frame. Although the grinding device is highly efficient in processing pipes, its large size and weight bring inconvenience in transportation and operation, and when grinding a large volume of pipes, multiple people are required to carry them to the grinding device, which not only increases labor intensity, but also has a negative impact on work efficiency and safety.

[0004] Publication No. CN10052947A discloses a dustproof handheld pipe polisher, wherein a limit assembly is arranged in the middle of the handheld polisher body, a baffle is sleeved in the middle of the guide rod, a second positioning ring is sleeved in the middle of the mounting rod, casters are connected to the top of the fixed support rod and the movable support rod through a rotating shaft, a dustproof assembly is installed on the top of the dust cover, bag rings are inlaid at both ends of the rubber tube, and an air suction pipe is arranged in the middle of the rubber tube. Before polishing, the distance between the two baffles is adjusted, and then the angle between the movable support rod and the fixed support rod is adjusted, the casters roll on the ground, the grinding angle and height are easy to control, and the grinding effect is better. Before and during polishing, the vacuum pump is started to extract the air inside the rubber tube, reduce the internal air pressure, and the sundries and dust are sucked into the conical bag and blocked by the conical bag, that is, the dust can be removed. When the polishing device is used to grind the pipe at multiple angles, the operator has to repeatedly adjust the position of the grinder to adapt to different grinding angles, which not only increases the workload, but also leads to low work efficiency due to the need to constantly move the equipment. Summary of the invention

[0005] In order to improve the above situation, the portable pipe quick grinder of the present invention provides a method of driving multiple grinding wheels to rotate through a grinding motor, and the centers of the multiple grinding wheels are arranged along an arc shape, so that the grinding brush can work efficiently on the pipe surface. The handle can be rotated slightly along the pipe to complete the grinding of the pipe within a range of 180 degrees. After one side is polished, the pipe is rotated and the grinder is used again to polish the other parts, that is, the outer surface of the pipe can be completely polished. The grinder is small in size and easy to move, and can perform grinding in multiple directions at the same time. The grinding efficiency is fast and the grinding quality is uniform.

[0006] The portable pipe grinding machine of the present invention is realized as follows: The portable pipe grinding machine of the present invention comprises a supporting structure and a grinding structure. The invention is characterized in that the supporting structure is a semicircular ring structure, which can closely fit the curvature of the surface of the pipe to be polished, and can achieve uniform material removal and consistent polishing thickness. The polishing structure includes a plurality of polishing wheels, and the polishing wheels are placed on the supporting structure. The whole device can be driven to rotate around the central axis by a carrying handle, so that the polishing can be completed quickly. The support structure is composed of a base, a protective cover, a support plate, fixing holes, fixing screws, a handle and a positioning hole. The base is a semicircular ring structure. One end of the protective cover is fixed on the base. Preferably, the protective cover is in a semi-cylindrical structure, the outer contour of the protective cover is connected to the outer contour of the base, the inner arc diameter of the protective cover is smaller than the inner arc diameter of the base, and the other end of the protective cover is provided with a plurality of threaded holes arranged in an annular manner at equal distances. One side of the support plate is placed on the protective cover. There are multiple fixing holes around the outer arc of the support plate, and the fixing holes correspond to the threaded holes on the protective cover one by one. Multiple fixing screws pass through the support plate and are threadedly connected to the protective cover to fix the position of the support plate. The handle is fixed on the protective cover. Preferably, the handle is in a U-shaped configuration and is hollow. A plurality of equidistantly arranged circular positioning holes are provided around the inner arc of the other side surface of the support plate, and the positioning holes do not penetrate the support plate. The grinding device is composed of a grinding motor, a cavity, a transmission shaft, a main gear, a connecting shaft, a slave gear, a rotating shaft, a grinding wheel and grinding particles. The grinding motor is placed on the base. Preferably, there are two grinding motors, and the two grinding motors are symmetrically placed. A cavity is provided in the base, the cavity does not penetrate the base, and the cavity is in a semicircular ring structure. The transmission shaft is placed inside the base, one end of the transmission shaft is connected to one side of the base through a bearing, and the other end of the transmission shaft is connected to the motor shaft of the grinding motor and a supporting bearing is placed between the transmission shaft and the base. Preferably, the transmission shafts are provided with two and are symmetrically placed. The main gear is fixed on the transmission shaft and is coaxially arranged with the transmission shaft. Preferably, the main gear is provided with two, The connecting shaft is placed inside the base, and both ends of the connecting shaft are connected to the two sides of the base through bearings. Preferably, there are four connecting shafts, which are arranged equidistantly along the circumferential direction of the central axis of the base, and the four connecting shafts are arranged in groups of two, and the two connecting shafts in the same group are symmetrically arranged about the transmission axis. The slave gear is fixed on the connecting shaft and is coaxially arranged with the connecting shaft. The slave gear and the master gear are in meshing relationship. One end of the rotating shaft is connected to one side of the support plate through a bearing, and the other end of the rotating shaft is connected to the connecting shaft and a supporting bearing is placed between the rotating shaft and the base. The grinding wheel is fixed on the rotating shaft. Preferably, the grinding wheel and the rotating shaft are coaxially arranged, and the grinding wheel is provided with four Abrasive grains are placed on the grinding wheel. Preferably, the abrasive particles are in multiple groups, and the multiple groups of abrasive particles are arranged equidistantly along the axial direction of the grinding wheel; a group of abrasive particles has multiple abrasive particles, and the multiple abrasive particles in the same group are arranged equidistantly along the axial direction of the grinding wheel; Furthermore, a connecting frame is arranged on the support plate, and the connecting frame is arranged on the other side of the support plate, the connecting frame is in a semicircular ring structure, the cross section of the connecting frame is in an L-shaped arrangement, the inner arc diameters of the connecting frame and the support plate are the same, a plurality of holes arranged in an annular pattern at equal distances are opened around the outer contour of the connecting frame, the holes and the positioning holes correspond one to one, the positioning screws are threadedly connected through the connecting frame and are placed on the support plate to fix the position between the connecting frame and the support plate, a cleaning brush is arranged on the connecting frame, the cleaning brushes are evenly arranged on the inner side of the connecting frame, and the cleaning brushes are designed as soft brushes; Furthermore, the grinding wheel is replaced by a transmission wheel, the transmission wheel is fixedly placed on the rotating shaft and is coaxially placed, a plurality of limit grooves are opened on the transmission wheel, a baffle is fixedly placed at one end of the transmission wheel, the baffle is arranged in a circular ring, the diameter of the baffle is larger than the maximum diameter of the transmission wheel, a positioning groove is opened at the other end of the transmission wheel, an internal thread is arranged on the inner side of the positioning groove, the grinding wheel three is slidably placed on the transmission wheel, the inner contour of the grinding wheel three is the same as the outer contour of the transmission wheel, the diameter of the grinding wheel three is larger than the diameter of the baffle, the grinding wheel two is slidably placed on the transmission wheel, the inner contour of the grinding wheel two is the same as the outer contour of the transmission wheel, The diameter of wheel two is the same as that of grinding wheel three, the grinding wheel one is slidably placed on the transmission wheel, the inner contour of the grinding wheel one is the same as the outer contour of the transmission wheel, the diameter of the grinding wheel one is the same as that of the grinding wheel three, the roughness between the grinding wheels one, two and three gradually decreases, the fixed plate is threadedly connected and placed on the transmission wheel, the fixed plate is composed of two cylinders with the same inner diameter and different outer diameters superimposed, the inner annular surface diameter of the fixed plate is larger than the maximum diameter of the rotating shaft, the side surface of the cylindrical part with a smaller outer diameter of the fixed plate is provided with an external thread, and it matches the thread on the positioning groove, the groove is placed on the fixed plate, and the groove is arranged in an arc shape. Beneficial Effects

[0007] 1. It is small in size, easy to move and carry, and suitable for on-site grinding of pipes in different working environments.

[0008] Second, it can be polished in all directions without frequent manual adjustment of the polishing angle, reducing the labor intensity of workers.

[0009] 3. It can drive multiple grinding wheels to rotate synchronously, which significantly speeds up the grinding process and improves work efficiency.

[0010] 4. The grinding quality is uniform and consistent. The arc-shaped grinding wheels can better fit the curved surface of the pipe to ensure the grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural diagram of a portable pipe rapid grinding machine of the present invention; Figure 2 This is a structural schematic diagram of a portable pipe rapid grinding machine of the present invention; Figure 3 This is a structural schematic diagram of a portable pipe rapid grinding machine of the present invention; Figure 4 It is a three-dimensional structural diagram of a portable pipe rapid grinding machine of the present invention; Figure 5 This is a three-dimensional structural diagram of Example 2 of a portable pipe rapid grinding machine of the present invention, in which only the structure of the connecting frame is shown; Figure 6 This is a three-dimensional structural diagram of Example 3 of a portable pipe rapid grinding machine of the present invention, in which only the structure of the transmission wheel is shown; Figure 7 This is a schematic structural diagram of Example 3 of a portable pipe rapid grinding machine of the present invention, in which only the structure of the transmission wheel is shown; Figure 8 This is a schematic structural diagram of Example 3 of a portable rapid pipe grinder of the present invention, in which only the structure of the transmission wheel is shown. Attached photos

[0012] The components include a base (1), a protective cover (2), a handle (3), a support plate (4), a fixing screw (5), a grinding motor (6), a rotating shaft (7), a cavity (8), a transmission shaft (9), a main gear (10), a connecting shaft (11), a slave gear (12), a fixing hole (13), a grinding wheel (14), a grinding grain (15), a positioning hole (16), a connecting frame (17), a positioning screw (18), a cleaning brush (19), a grinding wheel three (20), a grinding wheel two (21), a grinding wheel one (22), a fixing plate (23), a groove (24), a transmission wheel (25), a positioning groove (26), and a baffle (27). DETAILED DESCRIPTION Example 1

[0013] The present invention discloses a portable pipe grinding machine, comprising a supporting structure and a grinding structure, wherein the supporting structure is in the form of a semicircular ring, and can closely fit the curvature of the surface of the pipe being ground, thereby achieving uniform material removal and consistent grinding thickness; the grinding wheel (14) is placed on the supporting structure, and the grinding structure comprises a plurality of grinding wheels (14); the whole device can be driven to rotate around a central axis by a carrying handle (3), so that grinding can be completed quickly. The support structure is composed of a base (1), a protective cover (2), a support plate (4), a fixing hole (13), a fixing screw (5), a handle (3) and a positioning hole (16). The base (1) is in the shape of a semicircular ring. One end of the protective cover (2) is fixed on the base (1). Preferably, the protective cover (2) is of a semi-cylindrical structure, the outer contour of the protective cover (2) is connected to the outer contour of the base (1), the inner arc surface diameter of the protective cover (2) is smaller than the inner arc surface diameter of the base (1), and the other end of the protective cover (2) is provided with a plurality of threaded holes arranged in an annular manner at equal distances. One side of the support plate (4) is placed on the protective cover (2). A plurality of fixing holes (13) are formed around the outer arc of the support plate (4), the fixing holes (13) corresponding to the threaded holes on the protective cover (2) one by one, and a plurality of fixing screws (5) pass through the support plate (4) and are threadedly connected to the protective cover (2), so as to fix the position of the support plate (4). The handle (3) is fixed on the protective cover (2). Preferably, the handle (3) is arranged in a U-shaped configuration, and the handle (3) is hollow. A plurality of equidistantly arranged circular positioning holes (16) are provided around the inner arc of the other side surface of the support plate (4); the locating holes (16) are not arranged to penetrate the support plate (4). The grinding device is composed of a grinding motor (6), a cavity (8), a transmission shaft (9), a main gear (10), a connecting shaft (11), a slave gear (12), a rotating shaft (7), a grinding wheel (14) and grinding particles (15). The grinding motor (6) is placed on the base (1). Preferably, two grinding motors (6) are provided, and the two grinding motors (6) are symmetrically placed. A cavity (8) is provided in the base (1), the cavity (8) does not penetrate the base (1), and the cavity (8) is in a semicircular ring structure. The transmission shaft (9) is placed inside the base (1), one end of the transmission shaft (9) is connected to one side of the base (1) via a bearing, the other end of the transmission shaft (9) is connected to the motor shaft of the grinding motor (6) and a support bearing is placed between the transmission shaft (9) and the base (1). Preferably, two conveying shafts (9) are provided and are symmetrically arranged. The main gear (10) is fixedly placed on the transmission shaft (9) and is coaxially arranged with the transmission shaft (9). Preferably, the main gear (10) is provided with two, The connecting shaft (11) is placed inside the base (1), and the two ends of the connecting shaft (11) are connected to the two sides of the base (1) through bearings respectively. Preferably, four connecting shafts (11) are provided, the four connecting shafts (11) are arranged equidistantly along the circumferential direction of the central axis of the base (1), the four connecting shafts (11) are arranged in groups of two, and the two connecting shafts (11) in the same group are symmetrically arranged with respect to the transmission shaft (9). The slave gear (12) is fixedly placed on the connecting shaft (11) and is coaxially arranged with the connecting shaft (11), and the slave gear (12) and the master gear (10) are in a meshing relationship. One end of the rotating shaft (7) is connected to one side of the support plate (4) via a bearing, and the other end of the rotating shaft (7) is connected to the connecting shaft (11) and a supporting bearing is disposed between the rotating shaft (7) and the base (1). The grinding wheel (14) is fixedly placed on the rotating shaft (7). Preferably, the grinding wheel (14) and the rotating shaft (7) are coaxially arranged, and the grinding wheel (14) is provided with four Abrasive grains (15) are placed on the grinding wheel (14). Preferably, the abrasive particles (15) are provided in a plurality of groups, and the abrasive particles (15) are arranged equidistantly along the axial direction of the grinding wheel (14); a group of the abrasive particles (15) is provided in a plurality of groups, and the abrasive particles (15) in the same group are arranged equidistantly along the axial direction of the grinding wheel (14); When in use, the entire device is placed on a pipe, and the grinding motor (6) drives the grinding wheel (14) on the rotating shaft (7) to rotate at high speed, thereby grinding the surface of the pipe. In this process, the arc arrangement of the grinding wheel (14) ensures uniform treatment of the four vertical strip areas of the pipe. The handle (3) is held and rotated slightly around the central axis of the pipe, so that effective grinding of the pipe surface within a range of 180 degrees can be achieved. While maintaining the stability of the handle (3), the device can be slid in the horizontal direction of the pipe to move the device to the next section of the pipe and continue the grinding operation. In this way, the grinding of the upper part of the pipe is completed section by section. When the grinding of the upper part is completed, the pipe is pushed to rotate 180 degrees along its axis so that the unpolished part is turned upward, and the above-mentioned operation steps are repeated again, that is, the small rotation around the central axis and the horizontal sliding action are performed to achieve grinding of the remaining part, so that the surface grinding work of the entire pipe can be completed. Example 2

[0014] The difference between this embodiment and the first embodiment is that: a connecting frame (17) is arranged on the support plate (4), the connecting frame (17) is arranged on the other side of the support plate (4), the connecting frame (17) is in a semicircular ring structure, the cross section of the connecting frame (17) is in an L-shaped configuration, the inner arc diameters of the connecting frame (17) and the support plate (4) are the same, a plurality of holes arranged in an annular pattern at equal distances are provided around the outer contour of the connecting frame (17), the holes and the positioning holes (16) correspond one to one, and the positioning screws (18) pass through the connecting frame (17) and are threadedly connected to the support plate (4), thereby fixing the connecting frame (17) and the support plate. (4), the cleaning brush (19) is evenly arranged on the inner side of the connecting frame (17), and the cleaning brush (19) is designed as a soft brush. When in use, the connecting frame (17) is fixed to one side of the support plate (4). During the grinding process, the gripping handle (3) is rotated or slid around the central axis of the pipe. The entire grinding device not only moves along the axis of the pipe to perform the grinding task, but also drives the cleaning brush (19) to brush the surface of the pipe as the grinding device moves on the pipe, which can effectively sweep away the debris and dust generated during the grinding process, significantly reducing the workload of secondary cleaning and further improving the overall work efficiency. Example 3

[0015] The difference between this embodiment and embodiment 1 is that: the grinding wheel (14) is replaced by a transmission wheel (25), the transmission wheel (25) is fixedly placed on the rotating shaft (7) and is coaxially placed, a plurality of limit grooves are provided on the transmission wheel (25), a baffle (27) is fixedly placed at one end of the transmission wheel (25), the baffle (27) is arranged in a circular ring, the diameter of the baffle (27) is larger than the maximum diameter of the transmission wheel (25), a positioning groove (26) is provided at the other end of the transmission wheel (25), the inner side of the positioning groove (26) is provided with an internal thread, the grinding wheel three (20) is slidably placed on the transmission wheel (25), the inner contour of the grinding wheel three (20) is the same as the outer contour of the transmission wheel (25), the diameter of the grinding wheel three (20) is larger than the maximum diameter of the transmission wheel (25), and the grinding wheel three (20) is larger than the maximum diameter of the transmission wheel (25). The diameter of the baffle plate (27) is such that the second grinding wheel (21) is slidably placed on the transmission wheel (25), the inner contour of the second grinding wheel (21) is the same as the outer contour of the transmission wheel (25), the diameter of the second grinding wheel (21) is the same as the diameter of the third grinding wheel (20), the first grinding wheel (22) is slidably placed on the transmission wheel (25), the inner contour of the first grinding wheel (22) is the same as the outer contour of the transmission wheel (25), the diameter of the first grinding wheel (22) is the same as the diameter of the third grinding wheel (20), the roughness of the first grinding wheel (22), the second grinding wheel (21) and the third grinding wheel (20) gradually decreases, and the fixing plate (23) is threadedly connected and placed on the transmission wheel (25), and the fixing plate (23) is two Cylinders with the same inner diameter and different outer diameters are stacked, the inner annular surface diameter of the fixing plate (23) is larger than the maximum diameter of the rotating shaft (7), the side surface of the cylindrical portion with a smaller outer diameter of the fixing plate (23) is provided with an external thread, which matches the thread on the positioning groove (26), the groove (24) is placed on the fixing plate (23), and the groove (24) is arranged in an arc shape. When in use, the grinding wheels are arranged from large to small according to the roughness, and pass through the transmission wheel (25) in sequence to achieve different stages of grinding processes. The limit groove above the transmission wheel (25) is specially designed to fix the position of the grinding wheel, effectively preventing it from rotating when rotating at high speed. The combined use of the baffle plate (27) and the fixing plate (23) ensures that the position of the grinding wheel is fixed in the horizontal direction, and during grinding, the grinding wheel is fixed in the horizontal direction. During the grinding process, the entire device is placed stably above the pipe so that the grinding wheel 1 (22) with the largest roughness contacts the pipe surface first for preliminary rough grinding. Then, the handle (3) is held to easily drive the device to rotate around the central axis of the pipe, so that the pipe can be evenly ground within a range of 180 degrees. After completing the preliminary grinding, the entire device is pushed to slide along the pipe to the next grinding wheel, that is, the grinding wheel 2 (21) with a smaller roughness, for further grinding. Finally, the pipe is finely ground by using the grinding wheel 3 (20) with the smallest roughness to achieve the desired surface smoothness. Grinding the pipe with grinding wheels of different roughness not only prolongs the service life of the grinding wheels, but also ensures the high quality of the grinding effect.Achieved high efficiency and high flatness grinding work; The base (1) cooperates with the protective cover (2) to support the grinding wheel (14), so that the plurality of grinding wheels (14) are arranged in an arc shape to form an arc-shaped grinding surface for multi-directional and large-scale grinding of the pipe, thereby avoiding the existence of grinding dead angles and reducing the number of adjustments to the angle of the pipe during the grinding process, and is easy to use; The protective cover (2) is in a semi-cylindrical structure. The design of connecting the outer contour of the protective cover (2) and the outer contour of the base (1) enables the plurality of grinding wheels (14) to be arranged in an arc shape to better fit the curved surface shape of the pipe. When the grinding wheel (14) is placed on the pipe, the arc-shaped design ensures uniform contact between the grinding wheel and the pipe surface, thereby ensuring consistent grinding quality of the entire pipe surface. The handle (3) and the base (1) adopt a hollow structure, which makes them small and light, greatly improving the portability of the device; The grinding wheel (14) is provided with a plurality of evenly arranged circular arcs, and can contact the surface of the pipe from different angles at the same time, thereby achieving multi-directional synchronous grinding, and significantly improving the efficiency of the grinding operation; The abrasive grains (15) are provided in a plurality of groups, and the abrasive grains (15) are arranged equidistantly along the axial direction of the grinding wheel (14). A group of abrasive grains (15) has a plurality of abrasive grains, and the abrasive grains (15) in the same group are arranged equidistantly along the axial direction of the grinding wheel (14). This design enables grinding of a plurality of areas on the surface of the pipe at the same time, thereby improving the uniformity of grinding and ensuring the consistency of the grinding effect. The plurality of grinding wheels (14) can be rotated around the pipe to achieve multi-directional grinding of the pipe surface. The pipe can be fixedly ground at 180 degrees by only slightly rotating the handle (3) around the pipe. When a part is ground, the pipe can be easily rotated to completely grind the unground outer surface again.

[0016] It should be noted that, unless otherwise clearly specified and limited, the terms "placed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection method such as folding connection, rivet connection, pin connection, adhesive connection and welding connection, it can also be a detachable connection method such as threaded connection, snap connection and hinge connection, or an integral connection, it can also be an electrical connection, or a direct connection, it can also be indirectly connected through an intermediate medium, it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] It should be further pointed out that, when describing the above specific embodiment, for the sake of simplicity and clarity, only the differences between the above specific embodiment and other embodiments are described, but those skilled in the art should know that the above specific embodiment itself is also an independent technical solution.

Claims

1. A portable pipe grinding machine, comprising a supporting structure and a grinding structure, characterized in that: The support structure is a semicircular ring structure, which can fit closely with the curvature of the surface of the pipe to be polished, and can achieve uniform material removal and consistent polishing thickness. The polishing structure includes multiple grinding wheels, which are placed on the support structure. The whole device is driven to rotate around the central axis by the carrying handle, so that polishing can be completed quickly. The support structure consists of a base, a protective cover, a support plate, a fixing hole, a fixing screw, a handle and a positioning hole. One end of the protective cover is fixed on the base, and one side of the support plate is placed on the protective cover. A plurality of fixing holes are opened around the outer arc of the support plate, and the fixing holes correspond to the threaded holes on the protective cover one by one. A plurality of fixing screws pass through the support plate and are threadedly connected to the protective cover to fix the position of the support plate. The handle is fixed on the protective cover, and a plurality of equidistant circularly arranged positioning holes are opened around the inner arc of the other side of the support plate. The grinding device consists of a grinding motor, a cavity, a transmission shaft, a main gear, a connecting shaft, a slave gear, a rotating shaft, a grinding wheel and grinding grains. The grinding motor is placed on a base, a cavity is provided in the base, the transmission shaft is placed inside the base, one end of the transmission shaft is connected to one side of the base through a bearing, the other end of the transmission shaft is connected to the motor shaft of the grinding motor and a support bearing is provided between the base, the main gear is fixedly placed on the transmission shaft and coaxially arranged with the transmission shaft, the connecting shaft is placed inside the base, the two ends of the connecting shaft are respectively connected to the two sides of the base through bearings, the slave gear is fixedly placed on the connecting shaft and coaxially arranged with the connecting shaft, the slave gear and the main gear are in a meshing relationship, one end of the rotating shaft is connected to one side of the support plate through a bearing, the other end of the rotating shaft is connected to the connecting shaft and a support bearing is provided between the base, the grinding wheel is fixedly placed on the rotating shaft, and the grinding grains are placed on the grinding wheel.

2. A portable pipe grinding machine according to claim 1, characterized in that A connecting frame is arranged on the support plate, and the connecting frame is arranged on the other side of the support plate. The connecting frame is in a semicircular ring structure, and the cross section of the connecting frame is L-shaped. The inner arc diameters of the connecting frame and the support plate are the same. A plurality of equidistant and annular holes are provided around the outer contour of the connecting frame, and the holes correspond to the positioning holes one by one. The positioning screws are threadedly connected through the connecting frame and are placed on the support plate to fix the position between the connecting frame and the support plate. A cleaning brush is arranged on the connecting frame, and the cleaning brushes are evenly arranged on the inner side of the connecting frame, and the cleaning brush is designed as a soft brush.

3. A portable pipe grinding machine according to claim 1, characterized in that The grinding wheel is replaced by a transmission wheel, which is fixed on the rotating shaft and coaxially placed, and a plurality of limit grooves are provided on the transmission wheel. A baffle is fixed on one end of the transmission wheel, and the baffle is arranged in a circular ring. The diameter of the baffle is larger than the maximum diameter of the transmission wheel. A positioning groove is provided at the other end of the transmission wheel, and an internal thread is provided on the inner side of the positioning groove. The grinding wheel three is slidably placed on the transmission wheel, and the inner contour of the grinding wheel three is the same as the outer contour of the transmission wheel. The diameter of the grinding wheel three is larger than the diameter of the baffle. The grinding wheel two is slidably placed on the transmission wheel, and the inner contour of the grinding wheel two is the same as the outer contour of the transmission wheel. The diameter is the same as the diameter of grinding wheel three, the grinding wheel one is slidably placed on the transmission wheel, the inner contour of the grinding wheel one is the same as the outer contour of the transmission wheel, the diameter of the grinding wheel one is the same as the diameter of the grinding wheel three, the roughness between the grinding wheel one, the grinding wheel two and the grinding wheel three gradually decreases, the fixed plate is threadedly connected and placed on the transmission wheel, the fixed plate is two cylinders with the same inner diameter and different outer diameters superimposed, the inner annular surface diameter of the fixed plate is larger than the maximum diameter of the rotating shaft, the side surface of the cylindrical part with a smaller outer diameter of the fixed plate is provided with an external thread, and it matches the thread on the positioning groove, the groove is placed on the fixed plate, and the groove is arranged in an arc shape.

4. A portable pipe grinding machine according to claim 1, characterized in that The base is in a semicircular ring structure, the protective cover is in a semi-cylindrical structure, the outer contour of the protective cover is connected to the outer contour of the base, the inner arc diameter of the protective cover is smaller than the inner arc diameter of the base, and the other end of the protective cover is provided with a plurality of threaded holes arranged in an equidistant ring.

5. A portable pipe grinding machine according to claim 1, characterized in that The handle is arranged in a U-shape and is hollow.

6. A portable pipe grinding machine according to claim 1, characterized in that The positioning hole is not arranged through the supporting plate.

7. A portable pipe grinding machine according to claim 1, characterized in that There are two grinding motors, and the two grinding motors are symmetrically placed.

8. The portable pipe grinding machine according to claim 1, characterized in that The cavity does not penetrate the base, and the cavity is in a semicircular ring structure.

9. The portable pipe grinding machine according to claim 1, characterized in that There are two transmission shafts and they are symmetrically placed, there are four connection shafts, the four connection shafts are equidistantly arranged along the circumferential direction of the central axis of the base, the four connection shafts are grouped in pairs, and the two connection shafts in the same group are symmetrically arranged about the transmission shaft.

10. The portable pipe grinding machine according to claim 1, characterized in that The grinding wheel and the rotating shaft are coaxially arranged. There are four grinding wheels. There are multiple groups of grinding grains, which are equidistantly arranged along the axial direction of the grinding wheel. There are multiple grinding grains in one group, and the multiple grinding grains in the same group are equidistantly arranged along the axial direction of the grinding wheel.

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