Uniform fine grinding structure of portable pipe grinding machine

Abstract

According to the uniform and fine grinding structure, the relative position between a grinding wheel and a pipe is fixed through an adjusting assembly, the surface of the pipe is ground through a grinding assembly, and a lifting handle drives the whole device to rotate around the central axis of the pipe; and therefore, the surface of the pipe can be uniformly and finely ground twice. The grinding device is characterized in that the grinding device is composed of a grinding assembly and an adjusting assembly, the grinding assembly is composed of arc-shaped baffles, a protection plate, a connecting plate, a first grinding motor, a first grinding wheel, a second grinding motor and a second grinding wheel, the two arc-shaped baffles are fixedly arranged at the two ends of the protection plate respectively, the protection plate is of a U-shaped structure, and a threaded hole is formed in the middle of the protection plate; brushes are arranged on the two side edges of an opening of each arc-shaped baffle, connecting plates are fixedly arranged at the two ends of each arc-shaped baffle, and the first grinding motor is fixedly arranged on the connecting plate corresponding to one arc-shaped baffle.

Description

Technical Field

[0001] The present invention discloses a portable pipe grinder with uniform and fine grinding structure, which relates to a grinding structure capable of uniformly and finely grinding the surface of a pipe, 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 an adjusting component, grinds the surface of the pipe by a grinding component, and drives the entire device to rotate around the central axis of the pipe by a handle, thereby uniformly and finely grinding the surface of the pipe twice. 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. 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 means 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 above portable pipe grinder can only grind pipes of fixed sizes. When grinding pipes of different diameters, it is necessary to carry multiple devices. When working, it is necessary to compare the device and the pipe to select the device of the appropriate size, which not only increases the working time but also slows down the work efficiency. Carrying multiple devices also increases the burden on the user, thereby reducing its portability and practicality. In addition, the surface roughness of multiple grinding wheels is the same. When using a grinding wheel with a smaller roughness, the service life is shorter. When using a grinding wheel with a larger roughness, the surface of the pipe cannot be finely ground. Summary of the invention

[0005] In order to improve the above situation, the present invention provides a portable pipe grinder uniform and fine grinding structure which provides a structure for fixing the relative position between the grinding wheel and the pipe by adjusting the component, grinding the surface of the pipe by the grinding component, and driving the entire device to rotate around the central axis of the pipe by the handle, thereby performing two uniform and fine grinding on the surface of the pipe.

[0006] The portable pipe grinder uniform fine grinding structure of the present invention is realized as follows: The portable pipe grinder uniform fine grinding structure of the present invention is composed of a grinding component and an adjusting component. The grinding assembly is composed of an arc baffle, a protection plate, a connecting plate, a first grinding motor, a first grinding wheel, a second grinding motor and a second grinding wheel. Two arc-shaped baffles are fixed at both ends of the protective plate. Preferably, the protective plate is in a U-shaped structure, and a threaded hole is opened in the middle of the protective plate. Preferably, the arc-shaped baffle has an arc-shaped structure from one side to two-thirds, the arc-shaped baffle extends downward to the other side at two-thirds, the outer side surfaces at one-third of the two arc-shaped baffles are respectively connected to the two ends of the protective plate, and the two sides of the arc-shaped baffle are placed obliquely, and the openings are opposite to each other. Preferably, brushes are placed on both sides of the opening of the arc-shaped baffle. Connecting plates are fixed at both ends of the arc-shaped baffle. The first grinding motor is fixed on a connecting plate corresponding to an arc-shaped baffle. One end of the first grinding wheel is rotatably connected to the side of the connecting plate through a bearing, and the other end of the first grinding wheel is connected to the motor shaft of the first grinding motor, and a supporting bearing is placed between the first grinding wheel and the connecting plate. The first grinding wheel protrudes an arc-shaped baffle. The second grinding motor is fixed on a connecting plate corresponding to another arc-shaped baffle. One end of the second grinding wheel is rotatably connected to the side of the connecting plate through a bearing, the other end of the second grinding wheel is connected to the motor shaft of the second grinding motor, and a supporting bearing is arranged between the second grinding wheel and the connecting plate, and an arc-shaped baffle protrudes from the second grinding wheel. Preferably, the roughness of the first grinding wheel is greater than the roughness of the second grinding wheel. The adjustment assembly is composed of a handle, a side plate, a limit slot, a support rod, a rotating rod, an adjustment rod, a rotating handle, a first sliding slot, a first sliding block, a first connecting slot, an adjustment sliding rod, a second sliding slot, a second sliding block, a second connecting slot, an adjustment rotating rod and a sliding wheel. The handle is fixed on the top surface of the protective plate. Preferably, the handle is in a U-shaped structure, and the handle is in a hollow structure. The two side panels are fixed on the inner side of the protective plate and are placed close to the two sides respectively. Preferably, the side plate height is less than the guard plate height. There are limit slots on the side panels. Rotating rods are fixed at both ends of the support rod, and the rotating rods cooperate with the limiting grooves to be slidably placed on the side plates. A rotating handle is fixed at one end of the adjusting rod. The adjusting rod passes through the threaded hole in the middle of the protective plate and is rotatably placed on the supporting rod, and is threadedly connected to the threaded hole in the middle of the protective plate. A first sliding groove is provided on the inner side of the protective plate. Preferably, there are two first sliding grooves, and the two first sliding grooves are symmetrically arranged. Sliding ribs are arranged on both sides of the first sliding block, and the first sliding block can be slidably placed on the inner side of the protective plate through the sliding ribs and the first sliding groove. The bottom surface of the first sliding block is provided with a first connecting groove. One end of the adjusting slide rod is hingedly placed in the first connecting groove. The inner side of the protective plate is provided with a second sliding groove corresponding to the first sliding groove. Sliding ribs are arranged on both sides of the second sliding block, and the second sliding block can be slidably placed on the inner side of the protective plate through the sliding ribs and the second sliding groove. The bottom surface of the second sliding block is provided with a second connecting groove. One end of the adjusting rotating rod is hingedly placed in the second connecting groove. Preferably, the two adjusting slide bars and the two adjusting rotating rods are crossed one by one, the rotating rods penetrate the adjusting slide bars and the adjusting rotating rods, and the adjusting slide bars and the adjusting rotating rods are rotatably connected at the intersection through the rotating rods. The other end of the adjusting slide rod is rotatably connected to a sliding wheel, and the other end of the adjusting rotating rod is rotatably connected to a sliding wheel. Preferably, there are four sliding wheels, two of which correspond to the other end of the adjusting slide rod, and the other two of which correspond to the other end of the adjusting rotating rod. Preferably, an anti-skid pad is provided on the surface of the sliding wheel; Furthermore, a rubber baffle is fixedly disposed on the outer side surface of the arc-shaped baffle near the other end, and the rubber baffle is in a long strip structure. Furthermore, the rotating handle is replaced by a special-shaped rotating handle, the special-shaped rotating handle is a T-shaped structure, and the bottom end of the special-shaped rotating handle is fixedly placed on one end of the adjusting rod; 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, 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 third grinding wheel is slidably placed on the transmission wheel, and the inner contour of the third grinding wheel is the same as the outer contour of the transmission wheel. The diameter of the third grinding wheel is larger than the diameter of the baffle. The second grinding wheel is slidably placed on the transmission wheel, and the inner contour of the second grinding wheel is the same as the outer contour of the transmission wheel. The diameter of the second grinding wheel is the same as that of the third grinding wheel. The first grinding wheel is slidably placed on the transmission wheel. The inner contour of the first grinding wheel is the same as the outer contour of the transmission wheel. The diameter of the first grinding wheel is the same as that of the third grinding wheel. The roughness of the first grinding wheel, the second grinding wheel and the third grinding wheel gradually decrease. The fixed plate is threadedly connected and placed on the transmission wheel. The fixed plate is a superposition of two cylinders with the same inner diameter and different outer diameters. 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, which 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 adjustment component can make the grinding wheel always close to the surface of the pipe and control the grinding depth at the same time, so that the surface of the pipe can be evenly polished, thereby improving the grinding quality.

[0009] 3. It can adapt to pipes of different diameters, improving the applicability of pipes.

[0010] 4. The design of two grinding wheels with different roughness can improve the fineness of the pipe surface and increase the service life of the grinding wheels.

[0011] 5. The design of the sliding wheel enables the entire pipe to slide easily on the surface of the pipe, which not only saves physical strength but also improves the flexibility of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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 5 This is a three-dimensional structural diagram of a second embodiment of a portable pipe 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 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 uniform and fine grinding structure of a portable pipe grinder of the present invention; Fig.10 A three-dimensional structural diagram of a uniform and fine grinding structure of a portable pipe grinder of the present invention; Fig.11 It is a structural schematic diagram of a uniform fine grinding structure of a portable pipe grinder of the present invention; Fig.12 It is a three-dimensional structural diagram of embodiment 2 of a uniform fine grinding structure of a portable pipe grinder of the present invention; Fig.13It is a three-dimensional structural diagram of Example 3 of a uniform fine grinding structure of a portable pipe grinder of the present invention. Attached photos

[0013] The components include: base (1), protective cover (2), handle (3), support plate (4), fixing screw (5), grinding motor (6), rotating shaft (7), cavity (8), transmission shaft (9), main gear (10), connecting shaft (11), slave gear (12), fixing hole (13), grinding wheel (14), grinding grain (15), positioning hole (16), connecting frame (17), positioning screw (18), cleaning brush (19), grinding wheel three (20), grinding wheel two (21), grinding wheel one (22), fixing plate (23), groove (24), transmission wheel (25), positioning groove (26), baffle (27), connecting plate ( 28), side plate (29), protective plate (30), handle (31), first grinding motor (32), arc baffle (33), sliding wheel (34), second grinding motor (35), second grinding wheel (36), first connecting groove (37), first sliding groove (38), first sliding block (39), second sliding block (40), second sliding groove (41), second connecting groove (42), first grinding wheel (43), adjusting slide rod (44), adjusting rotating rod (45), rotating handle (46), adjusting rod (47), limiting groove (48), rotating rod (49), supporting rod (50), rubber baffle (51), special-shaped rotating handle (52) DETAILED DESCRIPTION Example 1

[0014] The portable pipe grinder of the present invention has a uniform fine grinding structure, which is composed of a grinding component and an adjusting component. The grinding assembly is composed of an arc-shaped baffle plate (33), a protection plate (30), a connecting plate (28), a first grinding motor (32), a first grinding wheel (43), a second grinding motor (35) and a second grinding wheel (36). Two arc-shaped baffles (33) are respectively fixed at two ends of the protection plate (30). Preferably, the protective plate (30) is in a U-shaped structure, and a threaded hole is opened in the middle of the protective plate (30). Preferably, one side to two-thirds of the arc-shaped baffle (33) is in an arc-shaped structure, two-thirds of the arc-shaped baffle (33) extends downward to the other side, one-third of the outer side surfaces of the two arc-shaped baffles (33) are respectively connected to the two ends of the protective plate (30), and the two sides of the arc-shaped baffle (33) are placed obliquely, and the openings are opposite to each other. Preferably, brushes are placed on both sides of the opening of the arc-shaped baffle (33). Connecting plates (28) are fixedly mounted at both ends of the arc-shaped baffle (33). The first grinding motor (32) is fixedly placed on a connecting plate (28) corresponding to an arc-shaped baffle (33). One end of the first grinding wheel (43) is rotatably connected to the side of the connecting plate (28) via a bearing, the other end of the first grinding wheel (43) is connected to the motor shaft of the first grinding motor (32), and a supporting bearing is arranged between the first grinding wheel (43) and the connecting plate (28), and an arc-shaped baffle (33) protrudes from the first grinding wheel (43). The second grinding motor (35) is fixedly placed on a connecting plate (28) corresponding to the other arc-shaped baffle plate (33). One end of the second grinding wheel (36) is rotatably connected to the side of the connecting plate (28) via a bearing, the other end of the second grinding wheel (36) is connected to the motor shaft of the second grinding motor (35), and a supporting bearing is arranged between the second grinding wheel (36) and the connecting plate (28), and the second grinding wheel (36) protrudes from the two arc-shaped baffles (33). Preferably, the roughness of the first grinding wheel (43) is greater than the roughness of the second grinding wheel (36). The adjustment assembly comprises a handle (31), a side plate (29), a limiting groove (48), a support rod (50), a rotating rod (49), an adjustment rod (47), a rotating handle (46), a first sliding groove (38), a first sliding block (39), a first connecting groove (37), an adjustment sliding rod (44), a second sliding groove (41), a second sliding block (40), a second connecting groove (42), an adjustment rotating rod (45) and a sliding wheel (34). The handle (31) is fixedly placed on the top surface of the protective plate (30). Preferably, the handle (31) is in a U-shaped structure, and the handle (31) is in a hollow structure. The two side plates (29) are fixedly placed on the inner side of the protective plate (30) and are placed close to the two ends respectively. Preferably, the height of the side plate (29) is less than the height of the protective plate (30). The side plate (29) is provided with a limit groove (48). Rotating rods (49) are fixedly disposed at both ends of the support rod (50), and the rotating rods (49) cooperate with the limiting grooves (48) to be slidably disposed on the side plates (29). A rotating handle (46) is fixedly mounted on one end of the adjusting rod (47). The adjusting rod (47) passes through a threaded hole in the middle of the protective plate (30) and is rotatably mounted on the supporting rod (50), and is threadedly connected to the threaded hole in the middle of the protective plate (30). The inner side surface of the protective plate (30) is provided with a first sliding groove (38). Preferably, two first sliding grooves (38) are provided, and the two first sliding grooves (38) are symmetrically arranged. Sliding ribs are arranged on both side surfaces of the first sliding block (39), and the first sliding block (39) is slidably arranged on the inner side surface of the protective plate (30) by cooperating with the first sliding groove (38) through the sliding ribs. The bottom surface of the first sliding block (39) is provided with a first connecting groove (37). One end of the adjusting slide rod (44) is hingedly disposed in the first connecting groove (37). The inner side of the protective plate (30) is provided with a second sliding groove (41) corresponding to the first sliding groove (38). Sliding ribs are arranged on both side surfaces of the second sliding block (40), and the second sliding block (40) is slidably placed on the inner side surface of the protective plate (30) by means of the sliding ribs cooperating with the second sliding groove (41). A second connecting groove (42) is formed on the bottom surface of the second sliding block (40). One end of the adjusting rotating rod (45) is hingedly placed in the second connecting groove (42). Preferably, the two adjusting slide bars (44) and the two adjusting rotating bars (45) are cross-corresponding one to one, the rotating bar (49) passes through the adjusting slide bars (44) and the adjusting rotating bars (45), and the adjusting slide bars (44) and the adjusting rotating bars (45) are rotatably connected at the intersection through the rotating bar (49). The other end of the adjusting slide rod (44) is rotatably connected to a sliding wheel (34), and the other end of the adjusting rotating rod (45) is rotatably connected to a sliding wheel (34). Preferably, four sliding wheels (34) are provided, two of the sliding wheels (34) correspond to the other ends of the adjusting sliding rod (44) in a one-to-one manner, and the other two sliding wheels (34) correspond to the other ends of the adjusting rotating rod (45) in a one-to-one manner. When in use, the entire device is placed above the pipe, and the adjusting rod (47) is rotated by rotating the handle (46), so that the support rod (50) can slide in the vertical direction, thereby adjusting the angle between the adjusting slide rod (44) and the adjusting rotating rod (45), ensuring that the four sliding wheels (34) are in contact with the pipe surface and the two grinding wheels are in close contact with the pipe surface, and the first grinding motor (32) is started to make the first grinding wheel (43) grind the pipe surface, and the plurality of sliding wheels (34) are slid on the pipe surface around the central axis of the pipe in the direction of the first grinding wheel (43) by the lifting handle (31). When the second grinding wheel (36) contacts the initially grinded pipe surface, the second grinding motor (35) is immediately started to perform secondary fine grinding on the pipe surface. During the grinding process, the pipe can be rotated to grind the pipe surface 360 ​​degrees, which not only reduces the roughness of the pipe surface, but also ensures a rapid and uniform grinding effect on the pipe surface. Example 2

[0015] A rubber baffle (51) is fixedly disposed on the outer side surface of the arc-shaped baffle (33) near the other end. The rubber baffle (51) is in a long strip structure. When in use, the rubber baffle (51) can prevent debris from splashing during the grinding process, protecting the user from accidental injuries. At the same time, the rubber baffle (51) is made of soft material, and will not have any negative impact on the grinding progress when the rubber baffle (51) contacts the pipe. Example 3

[0016] The rotating handle (46) is replaced by a special-shaped rotating handle (52), the special-shaped rotating handle (52) is in a T-shaped structure, the bottom end of the special-shaped rotating handle (52) is fixedly placed on one end of the adjustment rod (47), and when in use, the special-shaped rotating handle (52) matches the gripping method of the palm of the hand in shape, which can save more effort when in use, and improve work comfort and efficiency; The design that the height of the side plate (29) is smaller than the height of the protective plate (30) can prevent the side plate (29) from contacting the surface of the pipe during the grinding process, thereby affecting the grinding progress; The design of the two arc-shaped baffles (33) with openings facing each other can avoid contact between the arc-shaped baffles (33) and the surface of the pipe when grinding a pipe with a smaller diameter, and can adapt to pipes with a wider diameter range; The cross design of the adjusting slide bar (44) and the adjusting rotating bar (45) can ensure that no matter the diameter of the pipe is large or small, when the first grinding wheel (43) and the second grinding wheel (36) are in contact with the pipe surface, the sliding wheel (34) can be closely attached to the pipe surface, providing support for the grinding wheel, and helping the grinding wheel to apply pressure on the pipe surface more stably and evenly, so that the grinding wheel can evenly grind the pipe surface; The other end of the adjusting slide rod (44) and the adjusting rotating rod (45) is provided with a sliding wheel (34). When the entire device needs to rotate around the central axis of the pipe during the grinding process, the sliding wheel (34) can slide smoothly on the surface of the pipe, thereby reducing the resistance during the operation and the labor intensity of the operator. The design of the limiting groove (48) on the side plate (29) can ensure that the support rod (50) slides in the vertical direction, plays a supporting role for the adjustment slide rod (44) and the adjustment rotating rod (45), and improves the stability of the entire device; The design of the first grinding wheel (43) having a roughness greater than that of the second grinding wheel (36) enables the first grinding wheel (43) to perform preliminary grinding on the surface of the pipe, thereby quickly removing relatively large uneven areas and protrusions on the surface of the pipe, and enables the second grinding wheel (36) to perform fine grinding on the surface of the pipe, thereby improving the smoothness and fineness of the surface of the pipe. Grinding wheels with different roughnesses can more reasonably distribute the workload of each grinding wheel, thereby avoiding excessive wear of a single grinding wheel, thereby extending the overall service life of the grinding wheels; The hollow structure of the handle (31) can reduce the weight of the entire device and improve the portability of the device. The sliding wheel (34) is provided with an anti-skid pad on its surface, which can increase the friction with the surface of the pipe, prevent the sliding wheel (34) from sliding relative to the surface during rotation, and improve the stability of the grinding process; The arc-shaped baffle (33) is designed with brushes on both sides of the opening. During the grinding process, the brushes contact the surface of the pipe to remove dust and debris on the pipe, thereby preventing the debris generated by the first grinding wheel (14) from being rolled and squeezed by the second grinding wheel (14) and scratching the surface of the pipe; The relative position between the grinding wheel and the pipe can be fixed by adjusting the assembly, the surface of the pipe is ground by the grinding assembly, and the entire device is driven to rotate around the central axis of the pipe by the handle (31), thereby performing two uniform and fine grinding on the surface of the pipe.

[0017] 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 (31), 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

[0018] 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

[0019] 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 limiting grooves (48) 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), and the grinding wheel three (20) is straight The diameter of the grinding wheel (21) is larger than the diameter of the baffle (27); the grinding wheel (21) is slidably placed on the transmission wheel (25); the inner contour of the grinding wheel (21) is the same as the outer contour of the transmission wheel (25); the diameter of the grinding wheel (21) is the same as the diameter of the grinding wheel (20); the grinding wheel (22) is slidably placed on the transmission wheel (25); the inner contour of the grinding wheel (22) is the same as the outer contour of the transmission wheel (25); the diameter of the grinding wheel (22) is the same as the diameter of the grinding wheel (20); the roughness of the grinding wheel (22), the grinding wheel (21) and the grinding wheel (20) gradually decreases; the fixing plate (23) is threadedly connected and placed on the transmission wheel (25); 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 (48) 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. 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 (31) and the hand (3) around the pipe can the pipe 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.

[0020] 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 a folding connection, a rivet connection, a pin connection, a bonding connection and a welding connection, or a detachable connection method such as a threaded connection, a snap connection and a hinge connection, or an integral connection, or an electrical connection, or a direct connection, or an indirect connection through an intermediate medium, or the internal connection 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.

Claims

1. A portable pipe grinding machine with uniform and fine grinding structure, characterized by: The invention is composed of a grinding assembly and an adjusting assembly, wherein the grinding assembly is composed of an arc-shaped baffle, a protective plate, a connecting plate, a first grinding motor, a first grinding wheel, a second grinding motor and a second grinding wheel, wherein the two arc-shaped baffles are respectively fixed at the two ends of the protective plate, and connecting plates are fixed at the two ends of the arc-shaped baffles, the first grinding motor is fixed on a connecting plate corresponding to an arc-shaped baffle, one end of the first grinding wheel is rotatably connected to the side of the connecting plate through a bearing, the other end of the first grinding wheel is connected to the motor shaft of the first grinding motor, and a supporting bearing is placed between the first grinding wheel and the connecting plate, the first grinding wheel protrudes an arc-shaped baffle, and the second grinding wheel protrudes an arc-shaped baffle. The motor is fixedly placed on a connecting plate corresponding to another arc-shaped baffle plate, one end of the second grinding wheel is rotatably connected to the side of the connecting plate through a bearing, the other end of the second grinding wheel is connected to the motor shaft of the second grinding motor, and a supporting bearing is placed between the second grinding wheel and the connecting plate, the second grinding wheel protrudes an arc-shaped baffle plate, the adjusting assembly is composed of a handle, a side plate, a limit groove, a support rod, a rotating rod, an adjusting rod, a rotating handle, a first sliding groove, a first sliding block, a first connecting groove, an adjusting sliding rod, a second sliding groove, a second sliding block, a second connecting groove, an adjusting rotating rod and a sliding wheel, the handle is fixedly placed on the top surface of the protective plate, and the two side plates The protective plate is fixedly placed on the inner side surface of the protective plate and respectively placed close to both sides. A limiting groove is provided on the side plate. Rotating rods are fixedly provided at both ends of the support rod. The rotating rod cooperates with the limiting groove and can be slidably placed on the side plate. A rotating handle is fixedly provided at one end of the adjusting rod. The adjusting rod passes through the threaded hole in the middle of the protective plate and can be rotatably placed on the supporting rod, and is threadedly connected to the threaded hole in the middle of the protective plate. A first sliding groove is provided on the inner side surface of the protective plate. Two of the first sliding grooves are provided. The two first sliding grooves are symmetrically arranged. Sliding ribs are provided on both sides of the first sliding block. The first sliding block cooperates with the first The sliding groove can be slidably placed on the inner side surface of the protective plate, a first connecting groove is opened on the bottom surface of the first sliding block, one end of the adjusting sliding rod is hingedly placed in the first connecting groove, a second sliding groove corresponding to the first sliding groove is opened on the inner side surface of the protective plate, sliding ribs are arranged on both sides of the second sliding block, the second sliding block can be slidably placed on the inner side surface of the protective plate through the sliding ribs and the second sliding groove, the second sliding block has a second connecting groove opened on the bottom surface, one end of the adjusting rotating rod is hingedly placed in the second connecting groove, the other end of the adjusting sliding rod is rotatably connected to a sliding wheel, and the other end of the adjusting rotating rod is rotatably connected to the sliding wheel.

2. A portable pipe grinding machine uniform fine grinding structure according to claim 1, characterized in that A rubber baffle is fixedly disposed on the outer side surface of the arc-shaped baffle close to the other end, and the rubber baffle is in a long strip structure.

3. The portable pipe grinding machine uniform fine grinding structure according to claim 1 is characterized in that The rotating handle is replaced by a special-shaped rotating handle, which is in a T-shaped structure, and the bottom end of the special-shaped rotating handle is fixedly placed on one end of the adjusting rod.

4. The portable pipe grinding machine uniform fine grinding structure according to claim 1 is characterized in that The protective plate is in a U-shaped structure, with a threaded hole in the middle of the protective plate. The arc-shaped baffle is in an arc-shaped structure from one side to two-thirds, and the arc-shaped baffle extends downward to the other side at two-thirds. The outer side surfaces at one-third of the two arc-shaped baffles are respectively connected to the two ends of the protective plate. The two sides of the arc-shaped baffle are placed obliquely and the openings are opposite to each other, which can avoid contact between the arc-shaped baffle and the surface of the pipe when grinding pipes with smaller diameters, and can adapt to pipes with a wider diameter range.

5. The portable pipe grinding machine uniform fine grinding structure according to claim 1 is characterized in that Brushes are arranged on both sides of the opening of the arc-shaped baffle. During the grinding process, the brushes contact the surface of the pipe to remove dust and debris on the pipe, and prevent the debris generated after grinding by the first grinding wheel from being scratched by the rolling and squeezing of the second grinding wheel. The roughness of the first grinding wheel is greater than that of the second grinding wheel, so that the first grinding wheel can perform preliminary grinding on the surface of the pipe, and can quickly remove large unevenness and protrusions on the surface of the pipe, so that the second grinding wheel can perform fine grinding on the surface of the pipe, thereby improving the smoothness and fineness of the surface of the pipe. Grinding wheels with different roughness can more reasonably distribute the workload of each grinding wheel, avoid excessive wear of a single grinding wheel, and thus extend the overall service life of the grinding wheel.

6. The portable pipe grinding machine uniform fine grinding structure according to claim 1 is characterized in that The handle is in a U-shaped structure, the handle is in a hollow structure, and the height of the side plate is less than the height of the protective plate, which can prevent the side plate from contacting the surface of the pipe during the grinding process and affecting the grinding progress.

7. The portable pipe grinding machine uniform fine grinding structure according to claim 1 is characterized in that The two adjusting slide bars and the two adjusting rotating rods correspond to each other and intersect with each other. The rotating rod passes through the adjusting slide bar and the adjusting rotating rod. The adjusting slide bar and the adjusting rotating rod are rotatably connected at the intersection through the rotating rod, which can ensure that no matter how big or small the diameter of the pipe is, when the first grinding wheel and the second grinding wheel are in contact with the surface of the pipe, the sliding wheel can be closely attached to the surface of the pipe, providing support for the grinding wheel, helping the grinding wheel to apply pressure on the surface of the pipe more stably and evenly, so that the grinding wheel can evenly grind the surface of the pipe.

8. The portable pipe grinding machine uniform fine grinding structure according to claim 1 is characterized in that There are four sliding wheels, two of which correspond one-to-one to the other end of the adjusting sliding rod, and the other two of which correspond one-to-one to the other end of the adjusting rotating rod. When the entire device needs to rotate around the central axis of the pipe during the grinding process, the sliding wheels can slide smoothly on the surface of the pipe, reducing the resistance during the operation and the labor intensity of the operator.

9. The portable pipe grinding machine uniform fine grinding structure according to claim 1 is characterized in that The surface of the sliding wheel is provided with an anti-skid pad, which can increase the friction with the surface of the pipe, prevent the sliding wheel from sliding relative to each other during rotation, and improve the stability of the grinding process.

10. The portable pipe grinding machine uniform fine grinding structure according to claim 1 is 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 whole device to rotate around the central axis with a 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. Multiple equally spaced circumferentially arranged threaded holes are opened at the other end of the protective cover. 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 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 fixedly placed on the protective cover. The handle is in a U-shaped setting and 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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