A galvanized steel pipe surface grinding treatment device for coating

Abstract

The present invention relates to a surface grinding treatment device for galvanized steel pipes for coating, comprising a base, two discs are arranged above the base, a placement hole is arranged in the middle of the discs, and the discs are fixedly connected to the base through a connecting plate; a clamping mechanism is used to clamp the galvanized steel pipe, the clamping mechanism comprises three strip holes penetrating the discs, threaded rods are installed in the three strip holes, one end of the threaded rods is fixedly connected to a slider, the slider is slidably installed with the inner side wall of the strip hole, the side walls of the two sliders are rotatably connected to a rotating shaft, a rotating roller is coaxially fixedly connected outside the rotating shaft, one end of the three threaded rods slides through the discs and is connected through a first transmission mechanism; a driving mechanism is used to drive the three rotating rollers. Compared with the prior art, galvanized steel pipes of different sizes can be ground, the wear of the grinding wheel can be compensated, and the grinding thickness of the galvanized steel pipe can be detected, and the grinding accuracy is high.

Description

Technical Field

[0001] The invention relates to the field of steel pipe grinding, in particular to a galvanized steel pipe surface grinding treatment device for painting. Background Art

[0002] Hot-dip galvanizing is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned in an ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to the hot-dip plating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion, and long service life. The hot-dip galvanized steel pipe matrix undergoes complex physical and chemical reactions with the molten plating solution to form a corrosion-resistant and tightly structured zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix, so it has strong corrosion resistance.

[0003] When grinding galvanized steel pipes, the existing grinding device cannot detect the outer diameter of the steel pipe. After grinding, the thickness of the galvanized layer of the steel pipe is likely to be too small. On the one hand, the thickness of the steel pipe becomes smaller and the pressure-bearing capacity becomes lower. On the other hand, since the zinc layer is too thin, the external air can easily oxidize the steel pipe and reduce its service life. Moreover, after the grinding wheel has been grinding the steel pipe for a long time, the grinding wheel will have a certain amount of wear. When grinding the steel pipe, the actual grinding thickness will be less than the set grinding thickness, resulting in insufficient grinding of the steel pipe and failure to achieve the grinding effect.

[0004] Therefore, based on the above problems, we invented a galvanized steel pipe surface grinding treatment device for painting. Summary of the invention

[0005] The purpose of the present invention is to provide a galvanized steel pipe surface grinding treatment device for painting to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a surface grinding treatment device for a galvanized steel pipe for coating, comprising:

[0007] A base, wherein two discs are arranged on the top of the base, a placement hole is arranged in the middle of the discs, and the discs are fixedly connected to the base through a connecting plate;

[0008] A clamping mechanism is used to clamp the galvanized steel pipe, the clamping mechanism comprises three strip holes penetrating a disc, threaded rods are installed in the three strip holes, one end of the threaded rod is fixedly connected to a slider, the slider is slidably installed with the inner side wall of the strip hole, the side walls of two sliders are rotatably connected to a rotating shaft, a rotating roller is coaxially fixedly connected to the outside of the rotating shaft, one end of the three threaded rods slides through the disc and is connected through a first transmission mechanism;

[0009] A driving mechanism, used for driving the three rotating rollers, the driving mechanism comprising three arc-shaped holes arranged on the disc, transmission shafts inserted in the arc-shaped holes, the three transmission shafts respectively corresponding to the three rotating shafts, the three transmission shafts are connected by a second transmission mechanism, the rotating shafts and the transmission shafts are rotatably penetrated by a same limiting plate, and the corresponding rotating shafts and the transmission shafts are connected by a third transmission mechanism;

[0010] A grinding mechanism is used for grinding galvanized steel pipes. The grinding mechanism includes two vertical plates fixedly connected to the upper end of a base, a slide plate is slidably installed between the two vertical plates, a grinder is provided under the slide plate, the grinder and the slide plate are fixedly connected by a telescopic rod, a fixed plate is rotatably installed at one end of one of the rotating shafts, the fixed plate is slidably connected to the outer wall of the grinder, and the upper end of the fixed plate is fixedly connected to the slide plate.

[0011] Preferably, the first transmission mechanism includes three threaded sleeves threadedly mounted on the outside of the threaded rod, the three threaded sleeves are all rotatably connected to the disc, the three threaded sleeves are coaxially fixedly connected to the outside of the first transmission gear, the disc is rotatably connected to the outside of an adjusting ring, the side wall of the adjusting ring is provided with an annular tooth groove meshing with the three first transmission gears, a rotating shaft is rotatably provided between the two connecting plates, the rotating shaft is coaxially fixedly connected to the outside of the adjusting gear, the outer side wall of the adjusting ring is provided with an annular tooth groove meshing with the adjusting gear, a first motor is installed at the upper end of the base, and the power shaft of the first motor is coaxially fixedly connected to the rotating shaft.

[0012] Preferably, the second transmission mechanism includes three second transmission gears coaxially fixedly connected to the three transmission shafts respectively, the disc is rotatably connected with a transmission ring, the inner wall of the transmission ring is provided with an annular tooth groove meshing with the three first transmission gears, a driving shaft is rotatably provided between the two connecting plates, a driving gear is coaxially fixedly connected outside the driving shaft, an annular tooth groove meshing with the driving gear is provided on the outer wall of the transmission ring, a second motor is installed at the upper end of the base, and the power shaft of the second motor is coaxially fixedly connected to the driving shaft.

[0013] Preferably, the third transmission mechanism comprises a first pulley and a second pulley, the first pulley is coaxially fixedly connected to the transmission shaft, the second pulley is coaxially fixedly connected to the rotating shaft, and the first pulley and the second pulley are connected via a synchronous belt transmission.

[0014] Preferably, the grinder comprises a shell, a grinding wheel is provided in the shell, a third motor is fixedly mounted outside the shell, a power shaft of the third motor rotates and passes through the shell and is coaxially fixedly connected to the grinding wheel, a light source is fixedly mounted on the left inner wall of the shell, a photoresistor is embedded in the top of the shell, the photoresistor matches the light source, the photoresistor is electrically connected to the telescopic rod, mounting plates are fixedly connected to the left and right ends of the shell, and distance sensors and zinc layer thickness measuring instruments are mounted on the lower ends of the two mounting plates.

[0015] Preferably, the three strip-shaped holes are distributed on the disc in a ring array.

[0016] Preferably, the three arc-shaped holes are distributed on the disc in a circular array, and the center of the arc-shaped hole coincides with the center of the disc.

[0017] Preferably, the intersection point of the axial lines of the three threaded rods coincides with the center of the disk.

[0018] Compared with the prior art, the present invention provides a surface grinding treatment device for galvanized steel pipes for painting, which has the following beneficial effects:

[0019] 1. This kind of galvanized steel pipe surface grinding treatment device for coating, when clamping the galvanized steel pipe, the steel pipe to be ground is placed in the placement hole, and then the power shaft of the first motor drives the rotating shaft to rotate, the rotating shaft drives the adjusting ring to rotate through the adjusting gear, and the adjusting ring will synchronously drive the three first transmission gears to rotate while rotating, the first transmission gear drives the threaded sleeve to rotate, the threaded sleeve drives the threaded rod to move under the action of the thread, the threaded rod drives the slider to move, the slider drives the rotating shaft and the rotating roller connected thereto to move, at the same time, the movement of the rotating shaft will synchronously drive the fixed plate to move, the fixed plate drives the slide plate to move, the slide plate will drive the grinder and the telescopic rod installed thereon to move, until the three rotating rollers are in contact with and tightly against the outer wall of the galvanized steel pipe, so that galvanized steel pipes of different sizes can be clamped, the scope of application is wide and the outer diameter of the galvanized steel pipe can be measured.

[0020] 2. A galvanized steel pipe surface grinding treatment device for painting, when the grinding wheel is worn, a light source is used to irradiate the photoresistor. As the diameter of the grinding wheel becomes smaller, the range of the light source irradiating the photoresistor becomes larger. At this time, the telescopic rod is extended and retracted according to the change of the photoresistor, so that the distance between the lower end of the grinding wheel and the upper end of the telescopic rod is always consistent, thereby compensating for the diameter length of the worn grinding wheel, and avoiding insufficient grinding of the steel pipe during subsequent grinding.

[0021] 3. This kind of galvanized steel pipe surface grinding treatment device for coating, after clamping the galvanized steel pipe, drives the driving shaft to rotate through the power shaft of the second motor, the driving shaft drives the transmission ring to rotate through the driving gear, the transmission ring drives three transmission shafts to rotate through three second transmission gears connected thereto, the transmission shaft drives the first pulley to rotate, the first pulley drives the second pulley to rotate through the synchronous belt, the second pulley can drive the rotating shaft to rotate, the rotating shaft drives the rotating roller to rotate, and the rotating roller drives the galvanized steel pipe to rotate. It should be noted that before grinding the galvanized steel pipe, the grinding wheel is driven to rotate by the third motor, and the grinding wheel grinds the galvanized steel pipe. Before and after grinding, the zinc layer thickness is measured by two zinc layer thickness measuring instruments. On the one hand, the grinding thickness of the galvanized layer can be detected with high grinding accuracy, and on the other hand, the thickness of the galvanized layer can be measured.

[0022] In the present invention, galvanized steel pipes of different sizes can be polished, the wear of the grinding wheel can be compensated, and the polishing thickness of the galvanized steel pipe can be detected, and the polishing accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front structural schematic diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the local structure of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the driving mechanism in the present invention;

[0027] Figure 5 It is a structural schematic diagram of the disc in the present invention;

[0028] Figure 6 It is a structural perspective view of the grinding machine in the present invention;

[0029] Figure 7 It is a side structural schematic diagram of the present invention.

[0030] In the figure: 1, base; 2, disc; 3, connecting plate; 4, clamping mechanism; 5, strip hole; 6, threaded rod; 7, slider; 8, rotating shaft; 9, rotating roller; 10, first transmission mechanism; 11, driving mechanism; 12, arc hole; 13, transmission shaft; 14, second transmission mechanism; 15, third transmission mechanism; 16, grinding mechanism; 17, vertical plate; 18, slide plate; 19, grinder; 20, telescopic rod; 21, fixed plate; 22, threaded sleeve; 23, first transmission gear ; 24. Adjustment ring; 25. Rotation shaft; 26. Adjustment gear; 27. First motor; 28. Second transmission gear; 29. ​​Transmission ring; 30. Drive shaft; 31. Drive gear; 32. Second motor; 33. First pulley; 34. Second pulley; 35. Housing; 36. Grinding wheel; 37. Third motor; 38. Light source; 39. Photoresistor; 40. Mounting plate; 41. Distance sensor; 42. Zinc layer thickness measuring instrument; 43. Limit plate; 44. Placement hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a surface grinding treatment device for galvanized steel pipes for painting.

[0033] like Figure 1-7 As shown, a galvanized steel pipe surface grinding treatment device for painting includes:

[0034] A base 1, two discs 2 are arranged on the top of the base 1, a placement hole 44 is arranged in the middle of the disc 2, and the disc 2 is fixedly connected to the base 1 through a connecting plate 3;

[0035] In order to clamp galvanized steel pipes of different sizes, a clamping mechanism 4 is provided for clamping the galvanized steel pipes. The clamping mechanism 4 includes three strip holes 5 penetrating the disc 2. Furthermore, the three strip holes 5 are distributed on the disc 2 in a circular array. Threaded rods 6 are installed in the three strip holes 5. It should be noted that the intersection of the axial lines of the three threaded rods 6 coincides with the center of the disc 2. A slider 7 is fixedly connected to one end of the threaded rod 6. The slider 7 is slidably installed on the inner wall of the strip hole 5. The side walls of the two sliders 7 are rotatably connected to a rotating shaft 8. A rotating roller 9 is coaxially fixedly connected to the outside of the rotating shaft 8. When clamping, the three rotating rollers 9 are brought close to each other so that the three rotating rollers 9 are in contact with and fixed to the galvanized steel pipe, so that galvanized steel pipes of different sizes can be clamped and fixed. The three threaded rods 6 are fixed to the inner wall of the disc 2. One end of the rod 6 slides through the disc 2 and is connected through the first transmission mechanism 10. Specifically, the first transmission mechanism 10 includes three threaded sleeves 22 threadedly sleeved on the outside of the threaded rod 6. The three threaded sleeves 22 are rotatably connected to the disc 2. The outside of the three threaded sleeves 22 are coaxially fixedly connected with the first transmission gear 23. The outside of the disc 2 is rotatably connected with an adjusting ring 24. The side wall of the adjusting ring 24 is provided with an annular tooth groove meshing with the three first transmission gears 23. A rotating shaft 25 is rotatably penetrated between the two connecting plates 3. The outside of the rotating shaft 25 is coaxially fixedly connected with an adjusting gear 26. The outer side wall of the adjusting ring 24 is provided with an annular tooth groove meshing with the adjusting gear 26. A first motor 27 is installed at the upper end of the base 1. The power shaft of the first motor 27 is coaxially fixedly connected with the rotating shaft 25.

[0036] Through the above technical features, when clamping the galvanized steel pipe, the steel pipe to be polished is placed in the placement hole 44, and then the power shaft of the first motor 27 drives the rotating shaft 25 to rotate, and the rotating shaft 25 drives the adjusting ring 24 to rotate through the adjusting gear 26. While rotating, the adjusting ring 24 will synchronously drive the three first transmission gears 23 to rotate, and the first transmission gear 23 drives the threaded sleeve 22 to rotate. The threaded sleeve 22 drives the threaded rod 6 to move under the action of the thread, and the threaded rod 6 drives the slider 7 to move, and the slider 7 drives the connected rotating shaft 8 and the rotating roller 9 to move. At the same time, the movement of the rotating shaft 8 will synchronously drive the fixed plate 21 to move, and the fixed plate 21 drives the slide plate 18 to move, and the slide plate 18 will drive the grinder 19 and the telescopic rod 20 installed thereon to move until the three rotating rollers 9 are in contact with and tightly pressed against the outer wall of the galvanized steel pipe.

[0037] In order to fully polish the galvanized steel pipe to be polished, the galvanized steel pipe needs to be rotated, so a driving mechanism 11 is provided for driving the three rotating rollers 9, and the driving mechanism 11 includes three arc holes 12 provided on the disc 2. Furthermore, the three arc holes 12 are distributed on the disc 2 in a circular array, and the center of the arc hole 12 coincides with the center of the disc 2. A transmission shaft 13 is inserted into the arc hole 12, and the three transmission shafts 13 correspond to the three rotating shafts 8 respectively. The three transmission shafts 13 are connected through a second transmission mechanism 14 for transmission. It is worth mentioning that the second transmission mechanism 14 includes three second transmission gears 28 which are coaxially fixedly connected to the three transmission shafts 13 respectively. A transmission ring 29 is connected to the outer rotation of the disc 2, and the inner side wall of the transmission ring 29 is provided with a transmission ring 29 which is connected to the three first transmission gears 2 3 are meshed with annular tooth grooves, a driving shaft 30 is rotatably penetrated between the two connecting plates 3, a driving gear 31 is coaxially fixedly connected to the outside of the driving shaft 30, an annular tooth groove meshing with the driving gear 31 is provided on the outer wall of the transmission ring 29, a second motor 32 is installed on the upper end of the base 1, the power shaft of the second motor 32 is coaxially fixedly connected to the driving shaft 30, the rotating shaft 8 and the transmission shaft 13 are rotatably penetrated with the same limiting plate 43, the corresponding rotating shaft 8 and the transmission shaft 13 are connected through the third transmission mechanism 15, further, the third transmission mechanism 15 includes a first pulley 33 and a second pulley 34, the first pulley 33 is coaxially fixedly connected to the transmission shaft 13, the second pulley 34 is coaxially fixedly connected to the rotating shaft 8, and the first pulley 33 and the second pulley 34 are connected through a synchronous belt transmission;

[0038] Through the above technical features, after the galvanized steel pipe is clamped, the drive shaft 30 is driven to rotate through the power shaft of the second motor 32, and the drive shaft 30 drives the transmission ring 29 to rotate through the driving gear 31. The transmission ring 29 drives the three transmission shafts 13 to rotate through three second transmission gears 28 connected thereto, and the transmission shaft 13 drives the first pulley 33 to rotate, and the first pulley 33 drives the second pulley 34 to rotate through the synchronous belt, and the second pulley 34 can drive the rotating shaft 8 to rotate, and the rotating shaft 8 drives the rotating roller 9 to rotate, and the rotating roller 9 drives the galvanized steel pipe to rotate, so as to drive the galvanized steel pipe. It should be noted that here only the galvanized steel pipe is rotated, and during the grinding process, pushing the galvanized steel pipe forward is common knowledge in this field and is a prior art, so it is not elaborated in detail.

[0039] When the galvanized steel pipe to be polished, a polishing mechanism 16 is set up for polishing the galvanized steel pipe. The polishing mechanism 16 includes two vertical plates 17 fixedly connected to the upper end of the base 1, and a slide plate 18 is slidably installed between the two vertical plates 17. A grinder 19 is provided under the slide plate 18. It should be noted that the grinder 19 includes a shell 35, a grinding wheel 36 is provided in the shell 35, and a third motor 37 is fixedly installed outside the shell 35. The power shaft of the third motor 37 rotates through the shell 35 and is coaxially fixedly connected with the grinding wheel 36. A light source 38 is fixedly installed on the left inner wall of the shell 35, and a photoresistor 39 is embedded in the top of the shell 35. It should be noted that the working principle of the photoresistor is based on the internal photoelectric effect of the semiconductor. Under dark conditions, most of the electrons inside the photoresistor are valence band electrons that cannot move freely. When there is light of appropriate wavelength, the valence band electrons in the photoresistor will absorb photon energy and transition to the conduction band, becoming free electrons that can conduct electricity and leaving a hole in the valence band. The greater the light intensity, the more electron-hole pairs are excited, and the lower the resistance of the photoresistor. After the light stops, the free electrons and hole pairs recombine, and the resistance of the photoresistor returns to its original value. That is, when the photoresistor sheet 39 is exposed to more light, the resistance becomes smaller, the current becomes larger, and is converted into an electrical signal. The telescopic rod 20 receives the electrical signal and extends. When the photoresistor sheet 39 is exposed to less light, the resistance becomes larger, the current becomes smaller, and is converted into an electrical signal. The telescopic rod 20 receives the electrical signal and shortens. The photoresistor sheet 39 matches the light source 38, and the photoresistor sheet 39 is electrically connected to the telescopic rod 20.

[0040] In the present invention, both left and right ends of the housing 35 are fixedly connected with mounting plates 40, and the lower ends of the two mounting plates 40 are installed with distance sensors 41 and zinc layer thickness measuring instruments 42. It should be noted that when the galvanized steel pipe is polished, the zinc layer thickness measuring instrument 42 on the left detects the zinc layer thickness of the galvanized steel pipe after polishing, and the zinc layer thickness measuring instrument 42 on the right detects the zinc layer thickness of the galvanized steel pipe before polishing. The difference between the two detection data is the thickness of the zinc layer polished away, which can detect the zinc layer thickness. The grinding thickness, on the other hand, can measure the thickness of the galvanized layer to prevent the zinc layer from being too thin and failing to protect the steel pipe. When grinding the galvanized steel pipe, the grinding wheel 36 is driven to rotate by the third motor 37, and the grinding wheel 36 grinds the galvanized steel pipe. The grinder 19 and the slide plate 18 are fixedly connected by a telescopic rod 20, and a fixed plate 21 is rotatably installed at one end of one of the rotating shafts 8. The fixed plate 21 is slidably connected to the outer wall of the grinder 19, and the upper end of the fixed plate 21 is fixedly connected to the slide plate 18.

[0041] Through the above technical features, when the grinding wheel 36 is worn, the light source 38 is used to illuminate the photoresistor 39. As the diameter of the grinding wheel 36 becomes smaller, the range of the light source 38 irradiating the photoresistor 39 becomes larger. Since the photoresistor 39 is electrically connected to the telescopic rod 20, the telescopic rod 20 is extended and retracted according to the change of the photoresistor 39, so that the distance between the lower end of the grinding wheel 26 and the upper end of the telescopic rod 20 is always kept consistent, thereby compensating for the diameter length of the worn grinding wheel 36, and avoiding insufficient grinding of the steel pipe during subsequent grinding.

[0042] Working principle:

[0043] 1). When the grinding wheel 36 is worn, the worn part is compensated. At this time, the light source 38 irradiates the photoresistor 39. As the diameter of the grinding wheel 36 decreases, the range of the light source 38 irradiating the photoresistor 39 becomes larger. As the photoresistor 39 is electrically connected to the telescopic rod 20, the telescopic rod 20 is extended and retracted according to the change of the photoresistor 39, so that the distance between the lower end of the grinding wheel 26 and the upper end of the telescopic rod 20 is always consistent;

[0044] 2). When clamping the galvanized steel pipe, place the steel pipe to be polished in the placement hole 44, and then drive the rotating shaft 25 to rotate through the power shaft of the first motor 27, and the rotating shaft 25 drives the adjusting ring 24 to rotate through the adjusting gear 26. The adjusting ring 24 will synchronously drive the three first transmission gears 23 to rotate while rotating, and the first transmission gear 23 drives the threaded sleeve 22 to rotate. The threaded sleeve 22 drives the threaded rod 6 to move under the action of the thread, and the threaded rod 6 drives the slider 7 to move, and the slider 7 drives the rotating shaft 8 and the rotating roller 9 connected thereto to move. At the same time, the movement of the rotating shaft 8 will synchronously drive the fixed plate 21 to move, and the fixed plate 21 drives the slide plate 18 to move, and the slide plate 18 will drive the grinder 19 and the telescopic rod 20 installed thereon to move until the three rotating rollers 9 are in contact with and tightly pressed against the outer wall of the galvanized steel pipe;

[0045] 3). When driving the galvanized steel pipe, the power shaft of the second motor 32 drives the driving shaft 30 to rotate, the driving shaft 30 drives the transmission ring 29 to rotate through the driving gear 31, and the transmission ring 29 drives the three transmission shafts 13 to rotate through the three second transmission gears 28 connected thereto, the transmission shaft 13 drives the first pulley 33 to rotate, the first pulley 33 drives the second pulley 34 to rotate through the synchronous belt, the second pulley 34 can drive the rotating shaft 8 to rotate, the rotating shaft 8 drives the rotating roller 9 to rotate, and the rotating roller 9 drives the galvanized steel pipe to rotate, so that the galvanized steel pipe can be driven;

[0046] 4). When the galvanized steel pipe is being polished, the polishing wheel 36 is driven to rotate by the third motor 37, and the polishing wheel 36 polishes the galvanized steel pipe.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A galvanized steel pipe surface grinding treatment device for coating, characterized in that: include, A base (1), wherein two discs (2) are provided above the base (1), a placement hole (44) is provided in the middle of the discs (2), and the discs (2) are fixedly connected to the base (1) via a connecting plate (3); A clamping mechanism (4) for clamping a galvanized steel pipe, the clamping mechanism (4) comprising three strip holes (5) penetrating a disc (2), a threaded rod (6) being installed in each of the three strip holes (5), one end of the threaded rod (6) being fixedly connected to a slider (7), the slider (7) being slidably installed with the inner side wall of the strip hole (5), the side walls of two sliders (7) being rotatably connected to a rotating shaft (8), the rotating shaft (8) being coaxially fixedly connected to a rotating roller (9), one end of each of the three threaded rods (6) being slidably connected to the disc (2) and being transmission-connected via a first transmission mechanism (10); A driving mechanism (11) is used to drive the three rotating rollers (9), the driving mechanism (11) comprising three arc-shaped holes (12) arranged on the disc (2), a transmission shaft (13) being inserted into each of the arc-shaped holes (12), the three transmission shafts (13) corresponding to the three rotating shafts (8) respectively, the three transmission shafts (13) being connected to each other by a second transmission mechanism (14), the rotating shafts (8) and the transmission shafts (13) being rotatably penetrated by a same limiting plate (43), and the corresponding rotating shafts (8) and the transmission shafts (13) being connected to each other by a third transmission mechanism (15); A grinding mechanism (16) is used for grinding galvanized steel pipes, the grinding mechanism (16) comprising two vertical plates (17) fixedly connected to the upper end of the base (1), a slide plate (18) being slidably mounted between the two vertical plates (17), a grinder (19) being provided below the slide plate (18), the grinder (19) and the slide plate (18) being fixedly connected via a telescopic rod (20), a fixed plate (21) being rotatably mounted at one end of one of the rotating shafts (8), the fixed plate (21) being slidably connected to the outer wall of the grinder (19), and the upper end of the fixed plate (21) being fixedly connected to the slide plate (18); The first transmission mechanism (10) comprises three threaded sleeves (22) threadedly sleeved on the outside of the threaded rod (6), the three threaded sleeves (22) are all rotatably connected to the disc (2), the outside of the three threaded sleeves (22) are all coaxially fixedly connected to the first transmission gear (23), the outside of the disc (2) is rotatably connected to an adjustment ring (24), the side wall of the adjustment ring (24) is provided with an annular tooth groove meshing with the three first transmission gears (23), a rotating shaft (25) is rotatably passed through the two connecting plates (3), the outside of the rotating shaft (25) is coaxially fixedly connected to the adjusting gear (26), the outer side wall of the adjusting ring (24) is provided with an annular tooth groove meshing with the adjusting gear (26), and a first motor (27) is mounted on the upper end of the base (1), the power shaft of the first motor (27) is coaxially fixedly connected to the rotating shaft (25); The second transmission mechanism (14) comprises three second transmission gears (28) respectively coaxially fixedly connected to the three transmission shafts (13); the disk (2) is rotatably connected to a transmission ring (29) on the outside; an annular tooth groove meshing with the three first transmission gears (23) is provided on the inner side wall of the transmission ring (29); a driving shaft (30) is rotatably passed through the two connecting plates (3); a driving gear (31) is coaxially fixedly connected to the outside of the driving shaft (30); an annular tooth groove meshing with the driving gear (31) is provided on the outer side wall of the transmission ring (29); a second motor (32) is mounted on the upper end of the base (1); a power shaft of the second motor (32) is coaxially fixedly connected to the driving shaft (30); The third transmission mechanism (15) comprises a first pulley (33) and a second pulley (34); the first pulley (33) is coaxially fixedly connected to the transmission shaft (13); the second pulley (34) is coaxially fixedly connected to the rotating shaft (8); and the first pulley (33) and the second pulley (34) are connected via a synchronous belt transmission.

2. The surface grinding treatment device for galvanized steel pipe for coating according to claim 1 is characterized in that: The grinding machine (19) comprises a housing (35), a grinding wheel (36) is arranged in the housing (35), a third motor (37) is fixedly mounted outside the housing (35), a power shaft of the third motor (37) rotates through the housing (35) and is coaxially fixedly connected to the grinding wheel (36), a light source (38) is fixedly mounted on the left inner wall of the housing (35), a photoresistor (39) is embedded in the top of the housing (35), the photoresistor (39) matches the light source (38), and the photoresistor (39) is electrically connected to the telescopic rod (20), and mounting plates (40) are fixedly connected to the left and right ends of the housing (35), and distance sensors (41) and zinc layer thickness measuring instruments (42) are mounted on the lower ends of the two mounting plates (40).

3. The surface grinding treatment device for galvanized steel pipe for coating according to claim 1 is characterized in that: The three strip-shaped holes (5) are distributed on the disc (2) in a ring array.

4. The surface grinding treatment device for galvanized steel pipe for coating according to claim 1 is characterized in that: The three arc-shaped holes (12) are distributed on the disc (2) in a circular array, and the center of the arc-shaped hole (12) coincides with the center of the disc (2).

5. The surface grinding treatment device for galvanized steel pipe for coating according to claim 1 is characterized in that: The intersection point of the axial lines of the three threaded rods (6) coincides with the center of the disk (2).

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