Portable pipe grinding machine dust falling and cleaning structure

Abstract

According to the portable pipe grinding machine dust falling and cleaning structure, the relative position between a grinding wheel and a pipe is fixed through a supporting assembly so that the grinding depth can be controlled, the surface of the pipe is subjected to secondary grinding through a grinding assembly so that the grinding quality can be improved, and the surface of the pipe is cleaned through a cleaning assembly so that grinding dust can be reduced; therefore, the surface of the pipe is polished twice, and meanwhile, the surface of the pipe is cleaned to reduce dust. The device is characterized in that the device is composed of a supporting assembly, a grinding assembly and a cleaning assembly, the supporting assembly is composed of a supporting base, a protective cover, a connecting plate, a carrying handle, a containing cavity, a connecting groove and supporting wheels, the supporting base is of a semicircular structure, one end of the protective cover is fixedly arranged on the supporting base, and the connecting plate is fixedly arranged at the other end of the protective cover; and the lifting handle is fixedly arranged on the protective cover.

Description

Technical Field

[0001] The present invention discloses a dust reduction and cleaning structure for a portable pipe grinder, which relates to a structure capable of performing dust reduction and cleaning when grinding pipes, and belongs to the technical field of mechanical grinding, and particularly relates to a structure that fixes the relative position between a grinding wheel and a pipe by a support component to control the grinding depth, performs secondary grinding on the pipe surface by a grinding component to improve the grinding quality, and cleans the pipe surface by a cleaning component while reducing grinding dust. 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 due to their large size, they are inconvenient to carry. For small factories, 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. 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.

[0004] In order to improve the above problems, the applicant filed a Chinese invention patent application entitled "A Portable Pipe Grinding Machine". The motor drives the main gear to rotate, and then drives the grinding wheel to rotate at high speed by virtue of the meshing relationship between the main gear and the slave gear. By holding the handle, the device can be easily moved to fully grind the pipe. However, the particles generated by the above portable pipe grinder during grinding are easily adsorbed on the surface of the pipe, requiring additional manual intervention for secondary cleaning, which increases the workload. At the same time, a large amount of dust is generated during grinding. Since the operator needs to hold the device to directly grind the surface of the pipe, the large amount of dust generated may cause potential harm to the operator's health. Summary of the invention

[0005] In order to improve the above situation, the dust reduction and cleaning structure of a portable pipe grinder of the present invention provides a structure that fixes the relative position between the grinding wheel and the pipe by a supporting component to control the grinding depth, performs secondary grinding on the pipe surface by the grinding component to improve the grinding quality, cleans the pipe surface by the cleaning component and reduces grinding dust at the same time, thereby performing secondary grinding on the pipe surface and cleaning the pipe surface to reduce dust.

[0006] The dust reduction and cleaning structure of a portable pipe grinder of the present invention is realized as follows: The dust reduction and cleaning structure of a portable pipe grinder of the present invention is composed of a supporting component, a grinding component and a cleaning component. The support assembly is composed of a support seat, a protective cover, a connecting plate, a handle, a placement cavity, a connecting groove and a support wheel. The support seat is in a semicircular ring structure. One end of the protective cover is fixed on the support seat. 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 support seat, and the inner arc diameter of the protective cover is larger than the inner arc diameter of the support seat. The connecting plate is fixed at the other end of the protective cover. Preferably, the connecting plate is in a semicircular ring structure, the outer contour of the connecting plate is connected to the outer contour of the protective cover, and the inner arc surface of the connecting plate and the inner arc surface of the supporting seat have the same diameter. The handle is fixed on the protective cover. Preferably, the handle is in a U-shaped configuration and is hollow. A placement cavity is provided in the support seat. Preferably, the placement cavity does not penetrate the support seat, and the placement cavity is in a semicircular ring structure. The inner ring surface of the support seat is provided with a connection groove, and the inner ring surface of the connection plate is provided with a connection groove. Preferably, the connection grooves are provided in two groups, one group of the connection grooves is arranged on the inner annular surface of the support seat at equal distances along the circumference of the support seat, and the other group of the connection grooves is arranged on the inner annular surface of the connection plate at equal distances along the circumference of the support seat. The two ends of the supporting wheel axle are rotatably connected and placed on both sides of the connecting groove. Preferably, the number of the support wheels is the same as the number of the connection slots, and the support wheels and the connection slots correspond one to one. The grinding assembly is composed of a grinding motor, a transmission main gear, a second slave gear, a first slave gear, a first grinding wheel and a second grinding wheel. The grinding motor is fixed on the side of the support seat. The transmission main gear is placed inside the support seat, one end of the transmission main gear shaft is connected to one side of the support seat through a bearing, the other end of the transmission main gear shaft is connected to the motor shaft of the grinding motor and a support bearing is placed between the transmission main gear shaft and the support seat. The second slave gear is placed inside the support seat, and the two ends of the second slave gear are connected to the two sides of the support seat through bearings respectively, and the second slave gear is meshed with the transmission main gear. The first slave gear is placed inside the support seat, and the two ends of the first slave gear are connected to the two sides of the support seat through bearings respectively, and the first slave gear is meshed with the transmission main gear. Preferably, the first slave gear and the second slave gear are symmetrically arranged with respect to the transmission main gear, and the first slave gear and the second slave gear are arranged circumferentially along the central axis of the support seat. One end of the first grinding wheel is connected to one side of the connecting plate through a bearing, and the other end of the first grinding wheel is connected to the first slave gear and a support bearing is disposed between the first grinding wheel and the support seat. One end of the second grinding wheel is connected to one side of the connecting plate through a bearing, and the other end of the second grinding wheel is connected to the second slave gear and a support bearing is arranged between the second grinding wheel and the support seat. Preferably, the roughness of the first grinding wheel is greater than the roughness of the second grinding wheel. The cleaning assembly is composed of a cleaning motor, a motor reducer, a cleaning shaft, a cleaning brush, a dust suction fan, a dust suction port, a fixing clamp, a dust collection box, fixing screws, a connecting ring and a dust outlet pipe. The cleaning motor is fixed on the support seat. The motor reducer is placed inside the support seat, one end of the motor reducer is connected to one side of the support seat through a bearing, and the other end of the motor reducer is connected to the motor shaft of the cleaning motor and a support bearing is placed between the motor reducer and the support seat. One end of the cleaning shaft is connected to one side of the connecting plate through a bearing, and the other end of the cleaning shaft is connected to the motor reducer and a support bearing is placed between the cleaning shaft and the support seat. The cleaning brush is placed on the cleaning shaft. Preferably, the cleaning brushes are provided in multiple groups, and the multiple groups of cleaning brushes are arranged equidistantly in a spiral along the axial direction of the cleaning shaft, and a group of cleaning brushes is provided in multiple groups, and the multiple cleaning brushes in the same group are arranged equidistantly in a circumferential direction of the cleaning shaft. Preferably, two adjacent groups of cleaning brushes are arranged alternately. The dust suction fan is fixed on the inner ring surface of the protective cover. One end of the dust suction port is fixed on the dust suction fan. Preferably, the suction port is cylindrical from one end to one third, the length gradually increases from one third to five sixths, and the width remains unchanged; the cross section of the suction port is a rounded rectangular structure at five sixths, and the cross section remains unchanged from five sixths to the other end. Preferably, the suction port corresponds to the cleaning brush. The fixing clip is fixed on the inner ring surface of the protective cover. Preferably, there are multiple fixing clips, and the multiple fixing clips are arranged at equal distances along the length direction of the protective cover. The dust box is placed on the support base. The fixing screw passes through the dust box thread connection and is placed on the support base. One end of the connecting ring is threadedly connected to the dust collecting port of the dust collecting box. One end of the dust outlet pipe is connected to the dust suction fan, and the other end of the dust outlet pipe passes through the support seat and the other end of the connecting ring to be rotatably connected, and the dust outlet pipe is clamped in a plurality of fixing clips; Furthermore, the dust box is equipped with a dust bag, the dust bag is provided with a notch, the notch on the dust bag is fixedly placed on the outer ring surface of the dust collection port of the dust box, and the dust bag is made of microfiber cloth; Furthermore, the cleaning brush is replaced by a rubber sleeve, the rubber sleeve is placed on the cleaning shaft, the rubber sleeve is in a cylindrical structure, a card slot is opened on the outer ring surface of the rubber sleeve, the card slot is provided with multiple groups, the multiple groups of card slots are arranged equidistantly along the axial direction of the rubber sleeve, a group of the card slots has multiple, the multiple card slots in the same group are arranged equidistantly along the circumference of the rubber sleeve, one end of the dust removal brush is clamped on the card slot, the number of the dust removal brush and the card slot is the same, and the dust removal brush and the card slot correspond one to one; The present invention also relates to a portable pipe grinder, which 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, the sliding wheel enables the entire device to slide smoothly on the surface of the pipe, reducing the resistance during operation and the labor intensity of the operator. At the same time, it can fix the relative position between the grinding wheel and the pipe to evenly grind the surface of the pipe.

[0009] 3. During the grinding process, the particles adsorbed on the surface of the pipe are cleaned at the same time to reduce the difficulty of secondary cleaning and improve work efficiency.

[0010] 4. Absorb the dust generated during the grinding process to reduce the harm to the human body during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural diagram of a portable pipe grinding machine of the present invention; Figure 2 It is a structural schematic diagram of a portable pipe grinding machine of the present invention; Figure 3 It is a structural schematic diagram of a portable pipe grinding machine of the present invention; Figure 4 It is a three-dimensional structural diagram of a portable pipe grinding machine of the present invention; Figure 5It is a three-dimensional structural diagram of embodiment 2 of a portable pipe grinding machine of the present invention; Figure 6 This is a three-dimensional structural diagram of Example 3 of a portable pipe 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 grinder 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 pipe grinder of the present invention, in which only the structure of the transmission wheel is shown; Fig. 9 A three-dimensional structural diagram of a dust reduction and cleaning structure of a portable pipe grinder of the present invention; Fig.10 It is a structural schematic diagram of a dust reduction and cleaning structure of a portable pipe grinder of the present invention; Fig.11 It is a structural schematic diagram of a dust reduction and cleaning structure of a portable pipe grinder of the present invention; Fig.12 It is a structural schematic diagram of a dust reduction and cleaning structure of a portable pipe grinder of the present invention; Fig.13 A three-dimensional structural diagram of a dust reduction and cleaning structure of a portable pipe grinder of the present invention; Fig.14 This is a schematic structural diagram of Embodiment 2 of a dust reduction and cleaning structure for a portable pipe grinder of the present invention, in which only the structure of the dust collecting box is shown; Fig.15 This is a three-dimensional structural diagram of Example 3 of a dust reduction and cleaning structure for a portable pipe grinder of the present invention. 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), a baffle (27), a handle (28), a support seat ( 29), connecting ring (30), fixing screw (31), cleaning motor (32), protective cover (33), connecting plate (34), grinding motor (35), dust collecting box (36), placement chamber (37), second slave gear (38), transmission main gear (39), first slave gear (40), motor reducer (41), dust suction fan (42), dust outlet pipe (43), fixing clamp (44), second grinding wheel (45), first grinding wheel (46), connecting groove (47), supporting wheel (48), cleaning shaft (49), cleaning brush (50), dust suction port (51), dust bag (52), rubber sleeve (53), card slot (54), dust removal brush (55) DETAILED DESCRIPTION Example 1

[0013] The portable pipe grinding machine dust reduction and cleaning structure of the present invention is composed of a support component, a grinding component and a cleaning component. The support assembly is composed of a support base (29), a protective cover (33), a connecting plate (34), a handle (28), a placement cavity (37), a connecting groove (47), and a support wheel (48). The support seat (29) is in the form of a semicircular ring. One end of the protective cover (33) is fixed on the support seat (29). Preferably, the protective cover (33) is in a semi-cylindrical structure, the outer contour of the protective cover (33) is connected to the outer contour of the support seat (29), and the diameter of the inner arc surface of the protective cover (33) is larger than the diameter of the inner arc surface of the support seat (29). The connecting plate (34) is fixedly placed on the other end of the protective cover (33). Preferably, the connecting plate (34) is in a semicircular ring structure, the outer contour of the connecting plate (34) is connected to the outer contour of the protective cover (33), and the inner arc surface of the connecting plate (34) and the inner arc surface of the supporting seat (29) have the same diameter. The handle (28) is fixedly placed on the protective cover (33). Preferably, the handle (28) is arranged in a U-shaped configuration, and the handle (28) is hollow. The support seat (29) is provided with a placement cavity (37). Preferably, the placement cavity (37) does not penetrate the support seat (29), and the placement cavity (37) is in a semicircular ring structure. The support seat (29) has a connection groove (47) on its inner ring surface, and the connection plate (34) has a connection groove (47) on its inner ring surface. Preferably, the connection grooves (47) are provided in two groups, one group of the connection grooves (47) being arranged at equal distances along the circumference of the support seat (29) on the inner annular surface of the support seat (29), and the other group of the connection grooves (47) being arranged at equal distances along the circumference of the support seat (29) on the inner annular surface of the connection plate (34). The two ends of the wheel axle of the supporting wheel (48) are rotatably connected and placed on both side surfaces of the connecting groove (47). Preferably, the number of the support wheels (48) is the same as the number of the connecting grooves (47), and the support wheels (48) and the connecting grooves (47) correspond one to one. The grinding assembly is composed of a grinding motor (35), a transmission main gear (39), a second slave gear (38), a first slave gear (40), a first grinding wheel (46) and a second grinding wheel (45). The grinding motor (35) is fixed on the side of the support seat (29). The transmission main gear (39) is placed inside the support seat (29), one end of the transmission main gear (39) axle is connected to one side of the support seat (29) via a bearing, the other end of the transmission main gear (39) axle is connected to the motor shaft of the grinding motor (35) and a support bearing is placed between the transmission main gear (39) and the support seat (29). The second slave gear (38) is placed inside the support seat (29), and the two ends of the second slave gear (38) are connected to the two side surfaces of the support seat (29) through bearings, respectively. The second slave gear (38) and the transmission main gear (39) are meshed with each other. The first slave gear (40) is placed inside the support seat (29), and the two ends of the first slave gear (40) are connected to the two side surfaces of the support seat (29) through bearings respectively. The first slave gear (40) and the transmission main gear (39) are meshed with each other. Preferably, the first slave gear (40) and the second slave gear (38) are symmetrically arranged with respect to the transmission main gear (39), and the first slave gear (40) and the second slave gear (38) are arranged circumferentially along the central axis of the support seat (29). One end of the first grinding wheel (46) is connected to one side of the connecting plate (34) via a bearing, and the other end of the first grinding wheel (46) is connected to the first slave gear (40) and a support bearing is disposed between the first grinding wheel (46) and the support seat (29). One end of the second grinding wheel (45) is connected to one side of the connecting plate (34) via a bearing, and the other end of the second grinding wheel (45) is connected to the second slave gear (38) and a support bearing is disposed between the second grinding wheel (45) and the support seat (29). Preferably, the roughness of the first grinding wheel (46) is greater than the roughness of the second grinding wheel (45). The cleaning assembly comprises a cleaning motor (32), a motor reducer (41), a cleaning shaft (49), a cleaning brush (50), a dust suction fan (42), a dust suction port (51), a fixing clamp (44), a dust collection box (36), a fixing screw (31), a connecting ring (30) and a dust outlet pipe (43). The cleaning motor (32) is fixedly placed on the support seat (29). The motor reducer (41) is placed inside the support seat (29), one end of the motor reducer (41) is connected to one side of the support seat (29) via a bearing, the other end of the motor reducer (41) is connected to the motor shaft of the cleaning motor (32) and a support bearing is placed between the motor reducer (41) and the support seat (29). One end of the cleaning shaft (49) is connected to one side of the connecting plate (34) via a bearing, and the other end of the cleaning shaft (49) is connected to the motor reducer (41) and a support bearing is disposed between the cleaning shaft and the support seat (29). The cleaning brush (50) is placed on the cleaning shaft (49). Preferably, the cleaning brushes (50) are provided in multiple groups, and the multiple groups of cleaning brushes (50) are equidistantly arranged in a spiral along the axial direction of the cleaning shaft (49); a group of cleaning brushes (50) has multiple cleaning brushes, and the multiple cleaning brushes (50) in the same group are equidistantly arranged in a circumferential direction of the cleaning shaft (49); Preferably, two adjacent groups of cleaning brushes (50) are arranged in a staggered manner. The dust suction fan (42) is fixedly placed on the inner annular surface of the protective cover (33). One end of the dust suction port (51) is fixedly placed on the dust suction fan (42). Preferably, the suction port (51) has a cylindrical structure from one end to one third, and its length gradually increases from one third to five sixths, while its width remains unchanged; the suction port (51) has a rounded rectangular cross-section at five sixths, and its cross-section remains unchanged from five sixths to the other end. Preferably, the suction port (51) corresponds to the cleaning brush (50). The fixing clip (44) is fixedly placed on the inner annular surface of the protective cover (33). Preferably, a plurality of the fixing clips (44) are provided, and the plurality of fixing clips (44) are arranged at equal distances along the length direction of the protective cover (33). The dust box (36) is placed on the support base (29). The fixing screw (31) passes through the dust box (36) and is threadedly connected to the support seat (29). One end of the connecting ring (30) is threadedly connected to the dust collecting port of the dust collecting box (36). One end of the dust outlet pipe (43) is connected to the dust suction fan (42), the other end of the dust outlet pipe (43) passes through the support seat (29) and the other end of the connecting ring (30) to be rotatably connected, and the dust outlet pipe (43) is clamped in a plurality of fixing clips (44); When in use, the entire device is placed above the pipe by means of the handle (28), and the support wheel (48) can support the entire device, so that the pressure exerted by the grinding wheel (14) on the surface of the pipe can be kept consistent. The grinding motor (35) can be driven to drive the second slave gear (38) and the first slave gear (40) to rotate simultaneously through gearing, so that the second grinding wheel (45) and the first grinding wheel (46) can grind the surface of the pipe, and the first grinding wheel (46) can roughly grind the surface of the pipe. The handle (28) and the support wheel (48) can be used to rotate the entire device around the central axis of the pipe, so that the second grinding wheel (45) can perform a more detailed secondary grinding on the initially polished surface of the pipe, and the cleaning motor (32) can be driven to reduce the speed of the motor. The device (41) can enable the cleaning shaft (49) to remove the particle impurities attached to the surface of the pipe at an appropriate frequency, thereby preventing the impurities from attaching to the surface of the pipe again. The dust generated during the grinding process and the particles raised by the cleaning brush (19) when cleaning the surface of the pipe can be effectively absorbed through the dust suction port (51), so that these dust and particles are uniformly collected in the dust collection box (36). The pipe is rotated while grinding, so that the entire device slides smoothly around the central axis of the pipe, that is, the surface of the pipe can be polished smoothly while reducing the harm of dust to the human body. After grinding, the connecting ring (30) can be rotated to separate the dust outlet pipe (43) from the dust collection box (36), and the fixing screw (31) can be rotated to conveniently disassemble the dust collection box (36) so as to quickly dump the dust accumulated inside. Example 2

[0014] The difference between this embodiment and the first embodiment is that: the dust collecting box (36) is provided with a dust collecting bag (52), the dust collecting bag (52) is provided with a notch, the notch on the dust collecting bag (52) is fixedly placed on the outer ring surface of the dust collecting port of the dust collecting box (36), the dust collecting bag (52) is made of microfiber cloth, and when in use, after the polishing work is completed, the dust outlet pipe (43) can be separated from the dust collecting box (36) by rotating the connecting ring (30), and the dust collecting box (36) can be removed to pour out the dust from the dust inlet, and after pouring out the dust, the dust collecting bag (52) can be pulled out of the dust collecting box (36), so as to facilitate thorough cleaning of the inside of the dust collecting box (36) and avoid dust accumulation that cannot be poured out; Example 3

[0015] The difference between this embodiment and embodiment 1 is that the cleaning shaft (49) is replaced by a rubber sleeve (53), the rubber sleeve (53) is sleeved on the cleaning shaft (49), the rubber sleeve (53) is in a cylindrical structure, a card slot (54) is formed on the outer ring surface of the rubber sleeve (53), the card slot (54) is provided in a plurality of groups, the plurality of groups of card slots (54) are arranged equidistantly along the axial direction of the rubber sleeve (53), a group of the card slots (54) has a plurality of card slots (54), and the plurality of card slots (54) in the same group are arranged equidistantly along the axial direction of the rubber sleeve (53). The dust removal brush (55) is arranged at a distance from the tube, one end of the dust removal brush (55) is clamped on the clamping groove (54), the number of the dust removal brush (55) and the clamping groove (54) is the same, and the dust removal brush (55) corresponds to the clamping groove (54) one by one. When in use, the dust removal brush (55) can clean the surface of the tube. During the cleaning process, the dust removal brush (55) contacts the tube, which easily causes wear to the dust removal brush (55). The dust removal brush (55) can be pulled out and replaced with a new one to continue cleaning the surface of the tube, thereby ensuring cleaning efficiency and reducing use costs. The hollow structure of the handle (28) can reduce the weight of the entire device and improve the portability of the device; The first grinding wheel (46) is designed in conjunction with the second grinding wheel (45), so that the surface of the pipe can be ground to different degrees by grinding wheels (14) with different roughnesses, thereby improving the fineness of the pipe surface and increasing the service life of the grinding wheel (14); The suction port (51) has a cylindrical structure from one end to one third of the way, and its length gradually increases from one third to five sixths, while its width remains unchanged; the suction port (51) has a rounded rectangular structure at five sixths of the way, and its cross section remains unchanged from five sixths of the way to the other end, so that the wind force can be more concentrated, and dust generated during grinding can be quickly absorbed; The design of equidistantly arranging a plurality of support wheels (48) on the inner annular surface of the connecting plate (34) and the support seat (29) enables the sliding wheels to slide smoothly on the surface of the pipe when the entire device rotates around the central axis of the pipe during the grinding process, thereby reducing the resistance during the operation and the labor intensity of the operator. At the same time, the entire device is supported and the relative position between the grinding wheel (14) and the pipe can be fixed to control the grinding depth. The dust collecting box (36) is fixed to the support base (29) by means of fixing screws (31) and is detachable, so that an operator can quickly dump the dust accumulated inside. The design of the dust outlet pipe (43) being clamped on the fixing clamp (44) can play a supporting role for the dust outlet pipe (43), thereby preventing the dust outlet pipe (43) from bending during the grinding process, thereby affecting the dust collection efficiency; The cleaning brushes (50) are provided in a plurality of groups, and the plurality of groups of cleaning brushes (50) are equidistantly arranged in a spiral along the axial direction of the cleaning shaft (49). A group of cleaning brushes (50) has a plurality of cleaning brushes, and the plurality of cleaning brushes (50) in the same group are equidistantly arranged in a circumferential direction of the cleaning shaft (49), so that the metal dust after grinding can be drained to the position of the dust suction port (51), thereby effectively reducing the diffusion of the dust. The design of staggered arrangement of two adjacent groups of cleaning brushes (50) enables the cleaning brushes (50) to cover a larger surface area during cleaning, thereby reducing missed areas, and more effectively guide dust toward the dust suction port (51). In particular, with the cooperation of the spiral arrangement, a more effective dust conveying path can be formed, thereby promoting dust to be concentrated at the dust suction port (51) and reducing dust diffusion. The purpose is to fix the relative position between the grinding wheel and the pipe by the supporting component to control the grinding depth, perform secondary grinding on the pipe surface by the grinding component to improve the grinding quality, clean the pipe surface by the cleaning component and reduce the structure of grinding dust, so as to finely grind the pipe surface, clean impurities adsorbed on the pipe surface, absorb dust generated during the grinding process, and reduce harm to the human body.

[0016] 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 by a hand (3) to rotate around a central axis through a carrying handle (28), 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

[0017] 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

[0018] 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. Only by slightly rotating the handle (28) and the hand (3) around the pipe, the pipe can be fixedly ground at 180 degrees. When a part is ground, the pipe can be easily rotated to completely grind the unground outer surface again.

[0019] 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.

[0020] 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 dust reduction and cleaning structure for a portable pipe grinding machine, characterized by: The invention is composed of a supporting assembly, a grinding assembly and a cleaning assembly, wherein the supporting assembly is composed of a supporting seat, a protective cover, a connecting plate, a handle, a placement cavity, a connecting groove and a supporting wheel, one end of the protective cover is fixedly placed on the supporting seat, the connecting plate is fixedly placed on the other end of the protective cover, the handle is fixedly placed on the protective cover, a placement cavity is provided in the supporting seat, a connecting groove is provided on the inner ring surface of the supporting seat, a connecting groove is provided on the inner ring surface of the connecting plate, two ends of the supporting wheel axle are rotatably connected and placed on both sides of the connecting groove, the grinding assembly is composed of a grinding motor, a transmission main gear, a second slave gear, a first slave gear, a first grinding wheel and a second grinding wheel, and the grinding motor is fixedly placed on the side surface of the supporting seat The transmission main gear is placed inside the support seat, one end of the transmission main gear shaft is connected to one side of the support seat through a bearing, the other end of the transmission main gear shaft is connected to the motor shaft of the grinding motor and a support bearing is placed between the support seat, the second slave gear is placed inside the support seat, the two ends of the second slave gear are respectively connected to the two side surfaces of the support seat through bearings, the second slave gear and the transmission main gear are meshed, the first slave gear is placed inside the support seat, the two ends of the first slave gear are respectively connected to the two side surfaces of the support seat through bearings, the first slave gear and the transmission main gear are meshed, one end of the first grinding wheel is connected to one side of the connecting plate through a bearing, the first grinding wheel The other end is connected to the first slave gear and a support bearing is placed between the support seat, one end of the second grinding wheel is connected to one side of the connecting plate through the bearing, the other end of the second grinding wheel is connected to the second slave gear and a support bearing is placed between the support seat, the cleaning assembly is composed of a cleaning motor, a motor reducer, a cleaning shaft, a cleaning brush, a dust suction fan, a dust suction port, a fixing clamp, a dust collection box, a fixing screw, a connecting ring and a dust outlet pipe, the cleaning motor is fixed on the support seat, the motor reducer is placed inside the support seat, one end of the motor reducer is connected to one side of the support seat through the bearing, the other end of the motor reducer is connected to the motor shaft of the cleaning motor and between the support seat A support bearing is provided, one end of the cleaning shaft is connected to one side of the connecting plate through the bearing, the other end of the cleaning shaft is connected to the motor reducer and a support bearing is provided between the cleaning brush and the support seat, the cleaning brush is placed on the cleaning shaft, the dust suction fan is fixed on the inner ring surface of the protective cover, one end of the dust suction port is fixed on the dust suction fan, the fixing clip is fixed on the inner ring surface of the protective cover, the dust collecting box is placed on the support seat, the fixing screw passes through the dust collecting box and is threadedly connected to the support seat, one end of the connecting ring is threadedly connected to the dust collecting port of the dust collecting box, one end of the dust outlet pipe is connected to the dust suction fan, the other end of the dust outlet pipe passes through the support seat and is rotatably connected to the other end of the connecting ring, and the dust outlet pipe is clamped in multiple fixing clips.

2. A portable pipe grinding machine dust reduction and cleaning structure according to claim 1, characterized in that The dust collecting box is equipped with a dust collecting bag, the dust collecting bag is provided with a notch, the notch on the dust collecting bag is fixedly placed on the outer ring surface of the dust collecting port of the dust collecting box, and the dust collecting bag is made of microfiber cloth.

3. A dust reduction and cleaning structure for a portable pipe grinding machine according to claim 1, characterized in that The cleaning brush is replaced by a rubber sleeve, and the rubber sleeve is placed on the cleaning shaft. The rubber sleeve is in a cylindrical structure, and a card slot is opened on the outer ring surface of the rubber sleeve. The card slots are provided in multiple groups, and the multiple groups of card slots are arranged equidistantly along the axial direction of the rubber sleeve. A group has multiple card slots, and the multiple card slots in the same group are arranged equidistantly along the circumferential direction of the rubber sleeve. One end of the dust removal brush is clamped on the card slot, and the number of the dust removal brushes is the same as that of the card slots, and the dust removal brushes correspond to the card slots one by one.

4. A dust reduction and cleaning structure for a portable pipe grinding machine according to claim 1, characterized in that The support seat is in the shape of a semicircular ring, the connecting plate is in the shape of a semicircular ring, the outer contour of the connecting plate is connected to the outer contour of the protective cover, the inner arc surface of the connecting plate and the inner arc surface of the support seat have the same diameter, the protective cover is in the shape of a semicylindrical ring, the outer contour of the protective cover is connected to the outer contour of the support seat, and the diameter of the inner arc surface of the protective cover is larger than the diameter of the inner arc surface of the support seat.

5. The dust reduction and cleaning structure of a portable pipe grinding machine according to claim 1 is characterized in that The handle is arranged in a U-shape, the handle is hollow, the placement cavity does not penetrate the support seat, and the placement cavity is a semicircular ring structure.

6. The dust reduction and cleaning structure of a portable pipe grinding machine according to claim 1 is characterized in that The connecting grooves are provided with two groups, one group of connecting grooves are arranged equidistantly along the circumference of the supporting seat on the inner annular surface of the supporting seat, and the other group of connecting grooves are arranged equidistantly along the circumference of the supporting seat on the inner annular surface of the connecting plate. The number of the supporting wheels is the same as the connecting grooves, and the supporting wheels and the connecting grooves correspond one to one. When the whole device rotates around the central axis of the pipe during the grinding process, the sliding wheel can slide smoothly on the surface of the pipe, reducing the resistance during the operation and the labor intensity of the operator. At the same time, it plays a supporting role for the whole device and can fix the relative position between the grinding wheel and the pipe to control the grinding depth.

7. The dust reduction and cleaning structure of a portable pipe grinding machine according to claim 1 is characterized in that The first slave gear and the second slave gear are symmetrically arranged about the transmission main gear. The first slave gear and the second slave gear are circumferentially arranged along the central axis of the support seat. The roughness of the first grinding wheel is greater than that of the second grinding wheel. The surface of the pipe can be polished to different degrees by grinding wheels with different roughnesses, thereby improving the fineness of the pipe surface and increasing the service life of the grinding wheel.

8. The dust reduction and cleaning structure of a portable pipe grinding machine according to claim 1 is characterized in that There are multiple groups of cleaning brushes, and the multiple groups of cleaning brushes are equidistantly arranged in a spiral along the axial direction of the cleaning shaft. There are multiple cleaning brushes in one group, and the multiple cleaning brushes in the same group are equidistantly arranged along the circumferential direction of the cleaning shaft. The two adjacent groups of cleaning brushes are staggered, which can drain the polished metal dust to the position of the dust suction port, effectively reducing the diffusion of dust; during the cleaning process, the cleaning brush can cover a larger surface area, reduce the missed area, and at the same time can more effectively guide the dust to the dust suction port, especially with the cooperation of the spiral arrangement, it can form a more effective dust conveying path, promote the dust to concentrate at the dust suction port, and reduce the diffusion of dust.

9. The dust reduction and cleaning structure of a portable pipe grinding machine according to claim 1 is characterized in that The dust suction port is in a cylindrical structure from one end to one-third of the way, and its length gradually increases from one-third to five-sixths, while its width remains unchanged. The cross-section of the dust suction port is in a rounded rectangular structure at five-sixths of the way, and its cross-section remains unchanged from five-sixths to the other end. The dust suction port corresponds to the cleaning brush, and a plurality of fixing clips are provided, and the plurality of fixing clips are arranged at equal distances along the length direction of the protective cover.

10. The dust reduction and cleaning structure of a portable pipe grinding machine according to claim 1, characterized in that The described portable pipe grinding machine includes a support structure and a grinding structure. The support structure is in a semi-circular ring structure, which can closely fit the curvature of the surface of the pipe to be ground, enabling uniform material removal and consistent grinding thickness. The grinding structure includes multiple grinding wheels. The grinding wheels are placed on the support structure. By driving the entire device to rotate around the central axis through the hand-held handle, the grinding can be quickly completed. The support structure is composed of a base, a protective cover, a support plate, fixing holes, fixing screws, a handle, and positioning holes. The base is in a semi-circular ring structure. One end of the protective cover is fixedly placed on the base. 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. The other end of the protective cover is provided with multiple equally spaced circumferentially arranged threaded holes. One side of the support plate is placed on the protective cover. Multiple fixing holes are opened around the outer arc of the support plate. The fixing holes correspond one by one to the threaded holes on the protective cover. 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 fixedly placed on the protective cover. The handle is in a U-shaped setting. The handle is hollow. Multiple equally spaced circumferentially arranged positioning holes are opened around the inner arc of the other side of the support plate. 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 driven gear, a rotating shaft, a grinding wheel, and grinding grains. The grinding motor is placed on the base. There are two grinding motors, and the two grinding motors are symmetrically placed. A cavity is provided inside the base. The cavity does not penetrate the base. The cavity is in a semi-circular 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. The other end of the transmission shaft is connected to the motor shaft of the grinding motor and a support bearing is placed between the transmission shaft and the base. There are two transmission shafts and they are symmetrically placed. The main gear is fixedly placed on the transmission shaft and is coaxially arranged with the transmission shaft. There are two main gears. The connecting shaft is placed inside the base. Both ends of the connecting shaft are connected to both sides of the base through bearings respectively. There are four connecting shafts. The four connecting shafts are circumferentially equally spaced along the central axis of the base. The four connecting shafts are grouped in pairs. The two connecting shafts in the same group are symmetrically arranged with respect to the transmission shaft. The driven gear is fixedly placed on the connecting shaft and is coaxially arranged with the connecting shaft. The driven 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 placed between the rotating shaft and the base. The grinding wheel is fixedly placed on the rotating shaft. The grinding wheel and the rotating shaft are coaxially arranged. There are four grinding wheels. The grinding grains are placed on the grinding wheel. There are multiple groups of grinding grains. The multiple groups of grinding grains are equally spaced along the axial direction of the grinding wheel. One group of grinding grains has multiple grains. The multiple grains in the same group are equally spaced along the axial direction of the grinding wheel.

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