Metal pipe continuous spraying equipment and spraying process thereof

Abstract

The invention discloses continuous spraying equipment for metal pipes and a spraying process of the continuous spraying equipment, and belongs to the technical field of metal pipe production. When a rolling part reaches a protruding position of a pushing rail, a sealing sleeve is arranged at the tail end of the metal pipe in a sleeving mode along with moving of a sleeve rod, a spraying machine is started at the moment to conduct spraying operation, the sealing sleeve can block raised dust, and the dust is prevented from being blown by the sealing sleeve; and when the rolling piece leaves the protruding position of the pushing rail, the sleeve rod resets and drives the sealing sleeve to be removed from the tail end of the metal pipe, spraying of the metal pipe is completed, the dust is prevented from entering the metal pipe, meanwhile, automatic sleeving and removing of the sealing sleeve are achieved, and the spraying efficiency is improved. And the possibility of safety accidents such as fire disasters or explosions caused by the fact that workers directly contact with the metal pipe carelessly is reduced while manual dismounting and mounting of the plugging piece are replaced.

Description

Technical Field

[0001] The invention relates to the technical field of metal pipe production, and in particular to a metal pipe continuous spraying device and a spraying process thereof. Background Art

[0002] Electrostatic spraying of pipes is an efficient and environmentally friendly coating technology. An electrostatic field is formed between the electrode at the head of the spray gun and the grounded pipe. When the paint is sprayed from the spray gun, it will be dispersed into tiny particles by the electric field force and carry a negative charge. These negatively charged paint particles will be adsorbed to the surface of the grounded metal pipe under the action of the electric field force, forming a uniform and dense coating. After the electrostatic spraying of the pipe is completed, the pipe needs to be sent to a high-temperature curing furnace for heating and curing, so that the coating can be fully melted and leveled, and finally cured to form a hard coating. After curing, let the pipe cool naturally to room temperature in the curing furnace; When the use environment of metal pipes is relatively mild and there is no corrosive or abrasive medium, from a cost perspective, in order to avoid the additional cost investment required for spraying the inner wall, the spraying of the inner wall can be omitted. However, during the actual spraying process, some raised dust can easily enter the inner wall through the opening of the metal pipe. Although the dust will not directly affect the curing, it may interfere with the bonding between the coating and the metal pipe. For example, dust particles that enter the metal pipe cannot be fully leveled after melting, and they are likely to form hard lumps on the inner wall of the pipe after cooling. When the metal pipe is affected by external factors such as pressure and temperature, the pipe around the hard object will produce a large stress concentration, causing the coating on the outer wall to be more prone to cracks and peeling. The traditional method of manually using plugging parts to plug the openings before the metal pipes enter the spray workshop is rather cumbersome and needs to be removed after the spraying is completed. In addition, the metal pipes are usually in a grounded state. If the staff accidentally touches the metal pipes directly, static sparks may be generated, which may lead to safety accidents such as fire or explosion. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that dust particles entering the metal pipe cannot be fully leveled after melting, and are easy to form block-like hard objects on the inner wall of the pipe after cooling. When the metal pipe is affected by external factors such as pressure and temperature, the pipe around the hard object will produce a large stress concentration, causing the coating on the outer wall to be more prone to cracks and peeling. The traditional method of manually using plugging parts to block the openings before the metal pipe enters the spraying workshop is relatively cumbersome and needs to be removed after the spraying is completed. The metal pipe is usually in a grounded state. If the staff accidentally touches the metal pipe directly, static sparks may be generated, which may cause safety accidents such as fire or explosion. A continuous spraying equipment and a spraying process for metal pipes are proposed.

[0004] In order to achieve the above purpose, the present invention adopts the following technology: a metal pipe continuous spraying equipment and a spraying process thereof: The spraying workshop includes a spraying room, a sling conveyor belt running through the spraying room, and a sling hoisted on the sling conveyor belt and moving into the spraying room, a plurality of metal pipes are installed on the sling, and a plurality of nesting mechanisms are arranged in the spraying room, the nesting mechanisms include a mounting frame moving synchronously with the sling and a push track with a middle protrusion installed in the spraying room; The mounting frame is provided with a slidable sleeve rod, a movable abutment rod is embedded in the sleeve rod, and a rolling piece cooperating with the push track is provided on the abutment rod. When the rolling piece reaches the raised position of the push track, the sleeve rod is pushed to move by the abutment rod. The movable abutment rod can adjust the distance moved by the sleeve rod when it is pushed. The sleeve rod is also provided with a combination frame, on which two sealing sleeves are installed. When the sleeve rod moves, the sealing sleeves are placed on the ends of the metal pipes for sealing.

[0005] As a further description of the above-mentioned technology, a metal pipe continuous spraying equipment: The spray room is provided with an annular circulating transmission belt having the same number as the mounting racks, the mounting racks are arranged on the circulating transmission belts, and the speed at which the mounting racks are driven by the circulating transmission belts is the same as the speed at which the sling conveyor belts drive the slings to move.

[0006] As a further description of the above-mentioned technology, a metal pipe continuous spraying equipment: A first sliding block is arranged at the end of the mounting frame, a first sliding groove which engages with the first sliding block is opened on the surface of the sleeve rod, a guide rod which passes through the first sliding block is arranged in the first sliding groove, and a first spring is wound around the surface of the guide rod.

[0007] As a further description of the above-mentioned technology, a metal pipe continuous spraying equipment: The abutment rod moves in the sleeve rod through a pitch adjustment mechanism, which includes an open groove provided on the sleeve rod and a pitch adjustment gear rotatably arranged on the surface of the abutment rod, and teeth meshing with the pitch adjustment gear are arranged on the open groove. When the pitch adjustment gear rotates, the abutment rod moves out of the sleeve rod.

[0008] As a further description of the above-mentioned technology, a metal pipe continuous spraying equipment: The pitch adjustment mechanism also includes a receiving groove provided on the abutment rod, the receiving groove and the axis position of the pitch adjustment gear are the same, a second clamping block is provided on the inner wall of the receiving groove and a first base is provided in the middle; A rotating rod is rotatably sleeved on the surface of the first base, and a second spring is wound on the first base located inside the rotating rod, and two ends of the second spring are respectively in contact with the first base and the rotating rod; The inner wall of the pitch-adjusting gear is provided with a first clamping block, and the surface of the rotating rod is provided with a clamping groove engaged with the first clamping block and the second clamping block.

[0009] As a further description of the above-mentioned technology, a metal pipe continuous spraying equipment: The sealing sleeve is provided with an abutment mechanism inside, the abutment mechanism comprising a second base arranged in the sealing sleeve, a telescopic rod penetrating the middle of the second base and a third spring arranged inside the second base, an abutment plate is arranged at the end of the telescopic rod, and a second slider is arranged on the abutment plate; The sealing sleeve is provided with a second slide groove, a threaded rod is rotatably arranged in the second slide groove, a second slider is slidably embedded in the second slide groove and a threaded hole is opened on the surface thereof to engage with the threaded rod; One end of the threaded rod passes through the second slide groove and is connected to a closing mechanism, which includes a plurality of gate plates that are rotated and unfolded with the threaded rod. The ends of the unfolded gate plates are attached to the surface of the metal pipe to fill the gap between the closing sleeve and the metal pipe.

[0010] As a further description of the above-mentioned technology, a metal pipe continuous spraying equipment: The sealing mechanism also includes a rotating member rotatably arranged on the sealing sleeve and an annular receiving chamber installed at the end of the sealing sleeve, the threaded rod is connected to the rotating member and a driving gear is sleeved and installed on the surface of the rotating member; A gear ring meshing with the driving gear is rotatably embedded in the storage cavity, and a plurality of driven gears meshing with the gear ring are rotatably arranged on the inner wall of the storage cavity; The gate plate is installed on the driving gear and a plurality of driven gears.

[0011] As a further description of the above-mentioned technology, a metal pipe continuous spraying equipment: The gate plate includes a connecting portion connected to a driving gear and a plurality of driven gears, a closing portion integrally formed on the connecting portion and fitted with an outer wall of the metal pipe, a first fitting groove and a second fitting groove are respectively provided on both side surfaces of the closing portion, and the closing portion rotates with the connecting portion and is embedded in the second fitting groove provided on the surface of the adjacent closing portion.

[0012] As a further description of the above-mentioned technology, a metal pipe continuous spraying equipment: The threaded rod is connected to the rotating member through a speed change mechanism, and the speed change mechanism includes a first bevel gear arranged on the rotating member and four pitch adjustment grooves arranged on the surface of the threaded rod, and gear teeth are slidably embedded in the pitch adjustment grooves, and the four gear teeth can be combined into a first bevel gear, and a rotatable second bevel gear is meshed between the four gear teeth and the first bevel gear; Four adjusting rods are arranged in meshing rotation in the threaded rod, and the adjusting rods penetrate into the pitch adjusting grooves and are rotationally connected with the gear teeth.

[0013] In addition, the present invention also proposes a metal pipe continuous spraying process, which is applied to the above-mentioned metal pipe continuous spraying equipment, and the specific use steps are as follows: S1. Place the metal pipe on the hanger, and transport the hanger and the metal pipe to the spraying workshop through the hanger; S2. After the hanger and metal pipes arrive at the spraying workshop, point the spray pipe spray port downward to ensure smooth water flow, open the valve for flushing, and remove impurities such as oil, dust, etc. on the surface of the pipe. The pH value of the flushing water is 7-8, and the flushing time is 0.5-1 minute; S3. Use alkaline degreasing liquid to clean the surface of the metal pipe to decompose and remove grease to ensure that the coating can be firmly attached to the workpiece. The pH value of the degreasing liquid is 11-14, and the flushing time is 1 to 2 minutes; S4. Use alkaline degreasing liquid to clean the surface of the metal pipe again, and mix it with surfactant to reduce the surface tension of water, so that grease can be washed away more easily by water. The pH value of the degreasing liquid is 11-14, and the flushing time is 1.5 to 3 minutes; S5. Use a surface conditioner to spray the surface of the metal pipe to form a phosphating film or a chromating film on the surface of the metal pipe to enhance the roughness and polarity of the metal pipe surface, improve the mechanical bite force and chemical bonding force between the metal pipe and the dust during coating, and help ensure that the coating is not easy to fall off or peel off during long-term use; S6. Use phosphating liquid to spray the surface of metal pipes to form a uniform and rough phosphating film on the metal pipes. The phosphating film is porous, so that the powder coating can penetrate into these pores and closely combine with the phosphating film to form a dense coating, so as to enhance the adhesion between the coating and the metal pipe, making the coating more difficult to fall off or peel off; S7. Rinse three times to remove the alkaline degreasing solution, surface conditioner and phosphating solution remaining on the surface of the metal pipe. The pH value of the rinse water is 7-8, and the three rinses last for 0.5 to 1 minute. S8. Transport the hanger and the metal pipe to the drying workshop through the hanger, and bake at 180-200°C for 10-15 minutes to completely remove the moisture on the surface of the metal pipe; S9. After completing the above steps, the metal pipes are inspected. If qualified, the hanger and the metal pipes are transported to the spraying workshop through the hanger. According to the parameters of the metal pipes and the characteristics of the coating, the distance, angle and flow rate between the spray gun and the pipe are adjusted for spraying.

[0014] In summary, due to the use of the above-mentioned technology, a metal pipe continuous spraying device and a spraying process thereof, the beneficial effects of the present invention are: 1. Through the nesting mechanism, when the rolling part reaches the raised position of the push track, the closing sleeve moves with the sleeve rod and is sleeved on the end of the metal pipe. At this time, the spraying machine is started to spray. The closing sleeve can block the raised dust, thereby preventing the dust from entering the metal pipe. When the rolling part leaves the raised position of the push track, the sleeve rod is reset and drives the closing sleeve to be removed from the end of the metal pipe. The metal pipe spraying is completed. While preventing dust from entering the metal pipe, the automatic sleeve installation and removal of the closing sleeve is realized, replacing the manual disassembly and assembly of the sealing parts, and reducing the possibility of safety accidents such as fire or explosion caused by the staff's inadvertent direct contact with the metal pipe. 2. Through the abutment mechanism and closing mechanism, when the threaded rod rotates, the rotating member can drive the driving gear to rotate and drive the gear ring to rotate inside the storage chamber, and the multiple driven gears meshing with the storage chamber rotate under the drive of the storage chamber, so that the driving gear and the multiple driven gears simultaneously drive the gate plate to rotate and unfold, and the end of the unfolded gate plate fits on the surface of the metal pipe to fill the gap between the closing sleeve and the metal pipe, thereby achieving the purpose of closing the closing sleeve, and dust cannot enter the interior of the closing sleeve. At the same time, the closing sleeve is arranged in front of the surface of the metal pipe. In order to avoid the gate plate blocking the normal entry of the metal pipe, the various gate plates can be stacked and stored in the storage chamber through rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a metal pipe continuous spraying device is shown; Figure 2 A schematic diagram of the front cross-sectional structure of a metal pipe continuous spraying device is shown; Figure 3 A schematic diagram of a partial three-dimensional structure when the nesting mechanism is sleeved on the end of the metal pipe is shown; Figure 4 Shows Figure 3 A schematic diagram of the enlarged structure at A in the middle; Figure 5 A schematic diagram of the three-dimensional structure of the nesting mechanism is shown; Figure 6 A schematic diagram of the front cross-sectional structure of the nesting mechanism when it is located at the elevated section of the push track is shown; Figure 7 A schematic diagram of the front cross-sectional structure of the nesting mechanism when it is located in the lowering section of the push track is shown; Figure 8 A schematic diagram of a three-dimensional structure showing the connection of the sleeve rod and the abutment rod through a distance adjustment mechanism; Fig. 9 A schematic diagram of the cross-sectional structure of the nesting mechanism and the distance adjustment mechanism from top view is shown; Fig.10 Shows Fig. 9A schematic diagram of the enlarged structure at B in the middle; Fig.11 A schematic diagram of the three-dimensional split structure of the rotating rod and the pitch-adjusting gear is shown; Fig.12 A schematic diagram of a three-dimensional cross-sectional structure of the sealing sleeve and the internal abutment mechanism is shown; Fig.13 Shows Fig.12 Schematic diagram of the enlarged structure at C in the middle; Fig.14 A partial cross-sectional structural schematic diagram of the closing mechanism is shown; Fig.15 Shows Fig.14 Schematic diagram of the enlarged structure at D in the middle; Fig.16 A schematic diagram of a partial three-dimensional cross-sectional structure of a closing mechanism when the gate is unfolded for closing is shown; Fig.17 A schematic diagram of a partial three-dimensional cross-sectional structure of the closing mechanism when the gate is unfolded, rotated and stored is shown; Fig.18 A schematic diagram of the three-dimensional structure of the gate is shown; Fig.19 A schematic diagram of the front view of the speed change mechanism is shown; Fig. 20 A schematic diagram of a process flow of a continuous spraying process for a metal pipe is shown.

[0016] Legend: 10. Spraying workshop; 11. Spraying room; 12. Hoisting conveyor belt; 13. Spraying machine; 14. Hoisting device; 20. Nesting mechanism; 21. Mounting frame; 211. First slider; 22. Sleeve rod; 221. First slide slot; 222. Guide rod; 223. First spring; 23. Abutment rod; 231. Rolling element; 232. Pushing track; 24. Combination frame; 25. Closing sleeve; 26. Circular transmission belt; 30. Pitch adjustment mechanism; 31. Open slot; 32. Tooth; 33. Pitch adjustment gear; 34. First clamping block; 35. Accommodating slot; 36. Second clamping block; 37. First base; 38. Rotating rod; 39. Clamping slot; 310. Second spring; 40. abutment mechanism; 41. second base; 42. telescopic rod; 43. abutment plate; 44. third spring; 45. second slide groove; 46. threaded rod; 47. second slide block; 50. Closing mechanism; 51. Rotating member; 52. Accommodating chamber; 53. Gear ring; 54. Driving gear; 55. Gate; 551. Connecting part; 552. Closing part; 553. First fitting groove; 554. Second fitting groove; 56. Driven gear; 60. Speed ​​changing mechanism; 61. First bevel gear; 62. Second bevel gear; 63. Adjusting groove; 64. Gear teeth; 65. Adjusting rod. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technology in the embodiments of the present invention, a metal pipe continuous spraying device and its spraying process. 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.

[0018] In order to solve the problem that dust particles entering the metal pipe cannot be fully leveled after melting, and are easy to form block-like hard objects on the inner wall of the pipe after cooling, when the metal pipe is affected by external factors such as pressure and temperature, the pipe around the hard object will produce a large stress concentration, which makes the coating on the outer wall more prone to cracks and peeling. The traditional method of manually using plugging parts to block the openings before the metal pipe enters the spraying workshop is relatively cumbersome and needs to be removed after the spraying is completed. In addition, the metal pipe is usually in a grounded state. If the staff accidentally touches the metal pipe directly, static sparks may be generated, which may cause safety accidents such as fire or explosion. The present invention proposes a metal pipe continuous spraying equipment and a spraying process thereof, such as Figure 1 - Fig. 20 As shown: The spraying workshop 10 includes a spraying room 11, a sling conveyor belt 12 running through the spraying room 11, and a sling 14 hoisted on the sling conveyor belt 12 and moved into the spraying room 11, a plurality of metal pipes are installed on the sling 14, a plurality of nesting mechanisms 20 are arranged in the spraying room 11, the nesting mechanisms 20 include a mounting frame 21 that moves synchronously with the sling 14 and a push track 232 with a middle protrusion installed in the spraying room 11, and the spraying room 11 is provided with an annular circulating transmission belt 26 with the same number as the mounting frame 21, the mounting frame 21 is arranged on the circulating transmission belt 26, and the speed at which the circulating transmission belt 26 drives the mounting frame 21 to move is the same as the speed at which the sling conveyor belt 12 drives the sling 14 to move, so that when the sling 14 and the metal pipes installed on the sling 14 enter the spraying room 11, the circulating transmission belt 26 can drive the mounting frame 21 to a position corresponding to the metal pipe for subsequent operation; The mounting frame 21 is provided with a slidable sleeve rod 22, in which a movable abutting rod 23 is embedded, and a rolling member 231 cooperating with a pushing track 232 is provided on the abutting rod 23. When the mounting frame 21 drives the sleeve rod 22 and the abutting rod 23 to move, the rolling member 231 provided on the abutting rod 23 can enter the pushing track 232 and roll against the pushing track 232. When the rolling member 231 reaches the raised position of the pushing track 232, the pushing track 232 can push the rolling member 231 to move, and push the sleeve rod 22 to move under the restriction of the mounting frame 21 through the abutting rod 23. In order to ensure the stability of the movement of the sleeve rod 22, as Figure 6 - Figure 8 As shown, a first slider 211 is provided at the end of the mounting frame 21, a first slide groove 221 is provided on the surface of the sleeve rod 22 to be interlocked with the first slider 211, a guide rod 222 is provided in the first slide groove 221 to penetrate the first slider 211, and a first spring 223 is wound around the surface of the guide rod 222. Through this design, the sleeve rod 22 drives the first slide groove 221 and the guide rod 222 to move under the restriction of the first slider 211, and squeezes the first spring 223 during the movement to make it elastically deformed. When the rolling element 231 leaves the raised position of the push track 232, the push of the push track 232 on the rolling element 231 disappears, and the sleeve rod 22 is pulled to quickly reset under the action of the elastic deformation recovery of the first spring 223. A combination frame 24 is also provided on the sleeve rod 22, and two closing sleeves 25 are installed on the combination frame 24. When the sleeve rod 22 moves, the closing sleeve 25 is sleeved on the end of the metal pipe for blocking. When the rolling member 231 reaches the raised position of the pushing track 232, the closing sleeve 25 moves with the sleeve rod 22 and is sleeved on the end of the metal pipe. At this time, the spraying machine 13 is started again for spraying operation. The closing sleeve 25 can block the raised dust, thereby preventing the dust from entering the metal pipe. When the rolling member 231 leaves the raised position of the pushing track 232, the sleeve rod 22 is reset and drives the closing sleeve 25 to be removed from the end of the metal pipe. The spraying of the metal pipe is completed. While preventing dust from entering the metal pipe, the automatic sleeve and removal of the closing sleeve 25 are realized, which replaces the manual disassembly and assembly of the sealing member and reduces the possibility of safety accidents such as fire or explosion caused by the staff accidentally touching the metal pipe.

[0019] The abutment rod 23 moves in the sleeve rod 22 through the distance adjustment mechanism 30. The distance adjustment mechanism 30 includes an open groove 31 provided on the sleeve rod 22 and a distance adjustment gear 33 rotatably arranged on the surface of the abutment rod 23. The open groove 31 is provided with teeth 32 meshing with the distance adjustment gear 33. When the distance adjustment gear 33 rotates, the abutment rod 23 moves out of the sleeve rod 22. The position of the moving abutment rod 23 can change the moving distance of the sleeve rod 22 when it is pushed, thereby achieving the purpose of adjusting the sleeve position of the sealing sleeve 25, avoiding the problem that the end of the metal pipe cannot be sprayed due to the sleeve position being too deep, such as Figure 8 As shown, by rotating the pitch-adjusting gear 33, the pitch-adjusting gear 33 rotates and pushes the teeth 32 meshing therewith, so that the pitch-adjusting gear 33 moves inside the opening slot 31 and drives the abutting rod 23 to move, and the abutting rod 23 can be retracted inward or extended outward; Furthermore, in order to fix the adjusted abutment rod 23, as shown in FIG. Fig. 9 and Fig.10 As shown, the pitch adjustment mechanism 30 further includes a receiving groove 35 provided on the abutting rod 23. The receiving groove 35 has the same axial position as the pitch adjustment gear 33. A second clamping block 36 is provided on the inner wall of the receiving groove 35 and a first base 37 is provided in the middle thereof. A rotating rod 38 is rotatably sleeved on the surface of the first base 37, and a second spring 310 is wound around the first base 37 located inside the rotating rod 38, with two ends of the second spring 310 respectively fitting with the first base 37 and the rotating rod 38; A first clamping block 34 is disposed on the inner wall of the pitch-adjusting gear 33, and a clamping groove 39 engaged with the first clamping block 34 and the second clamping block 36 is provided on the surface of the rotating rod 38; Before the position of the abutting rod 23 needs to be adjusted, the rotating rod 38 is pulled so that the rotating rod 38 drives the slot 39 to slide under the restriction of the second clamping block 36 and the first clamping block 34. At the same time, the rotating rod 38 cooperates with the first base 37 to squeeze the second spring 310, and the rotating rod 38 extends to the outside of the accommodating groove 35 until the slot 39 falls off from the second clamping block 36. At this time, the second clamping block 36 no longer restricts the rotation of the rotating rod 38. At this time, the rotating rod 38 is rotated again, so that the rotating rod 38 drives the pitch adjustment gear 33 to rotate through the cooperation of the clamping slot 39 and the first clamping block 34, and the position of the abutting rod 23 can be adjusted. After the position adjustment of the abutment rod 23 is completed, the rotating rod 38 is released, and the rotating rod 38 is retracted into the accommodating groove 35 under the push of the elastic deformation recovery of the second spring 310, and the slot 39 is re-engaged in the surface of the second block 36. Under the cooperation of the second block 36 and the slot 39, the rotating rod 38 and the pitch adjusting gear 33 cannot rotate, and the teeth 32 and the pitch adjusting gear 33 can lock the abutment rod 23 so that it cannot move, and the abutment rod 23 is fixed.

[0020] In order to ensure that the sealing sleeve 25 can be easily mounted on the surface of the metal pipe, the inner diameter of the sealing sleeve 25 generally needs to be larger than the outer diameter of the metal pipe, resulting in a certain gap between the metal pipe and the sealing sleeve 25. During the spraying process of the sprayer 13 at the opposite position, dust can easily enter the metal pipe through the gap. In order to avoid this situation, Fig.12 As shown, an abutment mechanism 40 is disposed inside the closed sleeve 25, and the abutment mechanism 40 includes a second base 41 disposed inside the closed sleeve 25, a telescopic rod 42 penetrating the middle of the second base 41, and a third spring 44 disposed inside the second base 41, and an abutment plate 43 is disposed at the end of the telescopic rod 42, and a second slider 47 is disposed on the abutment plate 43; The sealing sleeve 25 is provided with a second slide groove 45, a threaded rod 46 is rotatably provided in the second slide groove 45, a second slider 47 is slidably embedded in the second slide groove 45 and a threaded hole is provided on the surface thereof to mesh with the threaded rod 46; When the sealing sleeve 25 is sleeved on the surface of the metal pipe, the metal pipe first contacts the abutment plate 43 and pushes the telescopic rod 42 to move inside the second base 41 and squeeze the third spring 44. At the same time, the abutment plate 43 drives the second slider 47 to move inside the second slide groove 45 and drives the threaded rod 46 to rotate. One end of the threaded rod 46 passes through the second slide groove 45 and is connected to the sealing mechanism 50. The sealing mechanism 50 includes a plurality of gates 55 that rotate and unfold with the threaded rod 46. The closing mechanism 50 further includes a rotating member 51 rotatably arranged on the closing sleeve 25 and an annular receiving chamber 52 installed at the end of the closing sleeve 25. The threaded rod 46 is connected to the rotating member 51 and a driving gear 54 is sleeved and installed on the surface of the rotating member 51. A gear ring 53 meshing with the driving gear 54 is rotatably embedded in the storage cavity 52, and a plurality of driven gears 56 meshing with the gear ring 53 are rotatably disposed on the inner wall of the storage cavity 52; The gate plate 55 is installed on the driving gear 54 and the plurality of driven gears 56. When the threaded rod 46 rotates, the rotating member 51 can drive the driving gear 54 to rotate and drive the gear ring 53 to rotate inside the receiving chamber 52. The plurality of driven gears 56 meshing with the receiving chamber 52 rotate under the drive of the receiving chamber 52, so that the driving gear 54 and the plurality of driven gears 56 simultaneously drive the gate plate 55 to rotate and unfold. The end of the unfolded gate plate 55 is attached to the surface of the metal pipe to fill the gap between the sealing sleeve 25 and the metal pipe, thereby achieving the purpose of closing the sealing sleeve 25, and dust cannot enter the interior of the sealing sleeve 25. At the same time, if Fig.16 - Fig.18As shown, the gate plate 55 includes a connecting portion 551 connected to the driving gear 54 and a plurality of driven gears 56, and a closing portion 552 is integrally formed on the connecting portion 551 and is fitted with the outer wall of the metal pipe. The two side surfaces of the closing portion 552 are respectively provided with a first fitting groove 553 and a second fitting groove 554, and the closing portion 552 rotates with the connecting portion 551 and is embedded in the second fitting groove 554 provided on the surface of the adjacent closing portion 552; Before the sealing sleeve 25 is sleeved on the surface of the metal pipe, in order to prevent the gate plates 55 from blocking the normal entry of the metal pipe, the gate plates 55 can be stacked and stored in the storage chamber 52 by rotation.

[0021] When the end of the metal pipe to be sprayed is provided with a mounting hole, it is necessary to use a closed sleeve 25 to completely cover the portion with the mounting hole to prevent dust from entering the metal pipe through the mounting hole. During the sleeve installation process, in order to allow the metal pipe to fully enter the closed sleeve 25, the rotation speed of the gate 55 is slowed down to prevent the gate 55 from closing too early and affecting the sleeve connection between the closed sleeve 25 and the metal pipe. Fig.19 As shown, the threaded rod 46 is connected to the rotating member 51 through a speed change mechanism 60. The speed change mechanism 60 includes a first bevel gear 61 arranged on the rotating member 51 and four pitch adjustment grooves 63 provided on the surface of the threaded rod 46. Gear teeth 64 are slidably embedded in the pitch adjustment grooves 63. The four gear teeth 64 can be combined into a first bevel gear 61. A rotatable second bevel gear 62 is meshed between the four gear teeth 64 and the first bevel gear 61. Four adjusting rods 65 are provided in meshing rotation in the threaded rod 46 , and the adjusting rods 65 penetrate into the distance adjusting groove 63 and are rotationally connected to the gear teeth 64 ; By rotating the corresponding adjusting rod 65 connected to the gear teeth 64, the adjusting rod 65 is rotated and moved, so as to pull the gear teeth 64 to slide under the restriction of the pitch adjusting groove 63. According to the number of movements of the pitch adjusting groove 63, the number is 0-3, so that when the threaded rod 46 rotates one circle, it can drive the second bevel gear 62 to rotate one circle, half a circle or a quarter of a circle. The second bevel gear 62 drives the first bevel gear 61 to rotate, so that the first bevel gear 61 can drive the rotating member 51 to rotate, thereby changing the transmission ratio between the threaded rod 46 and the rotating member 51, and the closing sleeve 25 can move to a deeper position on the surface of the metal pipe. The metal pipe also continues to push the abutment plate 43 and drives the threaded rod 46 to rotate through the second slider 47 until the gate 55 is completely closed after reaching the specified position.

[0022] The present invention also provides a metal pipe continuous spraying process, which is applied to the above-mentioned metal pipe continuous spraying equipment, and the specific use steps are as follows: S1. Place the metal pipe on the hanger, and transport the hanger and the metal pipe to the spraying workshop through the hanger; S2. After the hanger and metal pipes arrive at the spraying workshop, point the spray pipe spray port downward to ensure smooth water flow, open the valve for flushing, and remove impurities such as oil, dust, etc. on the surface of the pipe. The pH value of the flushing water is 7-8, and the flushing time is 0.5-1 minute; S3. Use alkaline degreasing liquid to clean the surface of the metal pipe to decompose and remove grease to ensure that the coating can be firmly attached to the workpiece. The pH value of the degreasing liquid is 11-14, and the flushing time is 1 to 2 minutes; S4. Use alkaline degreasing liquid to clean the surface of the metal pipe again, and mix it with surfactant to reduce the surface tension of water, so that grease can be washed away more easily by water. The pH value of the degreasing liquid is 11-14, and the flushing time is 1.5 to 3 minutes; S5. Use a surface conditioner to spray the surface of the metal pipe to form a phosphating film or a chromating film on the surface of the metal pipe to enhance the roughness and polarity of the metal pipe surface, improve the mechanical bite force and chemical bonding force between the metal pipe and the dust during coating, and help ensure that the coating is not easy to fall off or peel off during long-term use; S6. Use phosphating liquid to spray the surface of metal pipes to form a uniform and rough phosphating film on the metal pipes. The phosphating film is porous, so that the powder coating can penetrate into these pores and closely combine with the phosphating film to form a dense coating, so as to enhance the adhesion between the coating and the metal pipe, making the coating more difficult to fall off or peel off; S7. Rinse three times to remove the alkaline degreasing solution, surface conditioner and phosphating solution remaining on the surface of the metal pipe. The pH value of the rinse water is 7-8, and the three rinses last for 0.5 to 1 minute. S8. Transport the hanger and the metal pipe to the drying workshop through the hanger, and bake at 180-200°C for 10-15 minutes to completely remove the moisture on the surface of the metal pipe; S9. After completing the above steps, the metal pipes are inspected. If qualified, the hanger and the metal pipes are transported to the spraying workshop through the hanger. According to the parameters of the metal pipes and the characteristics of the coating, the distance, angle and flow rate between the spray gun and the pipe are adjusted for spraying.

[0023] The above description is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes to a metal pipe continuous spraying equipment and its spraying process and its inventive concept according to the technology of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A metal pipe continuous spraying device, comprising a spraying workshop (10), the spraying workshop (10) comprising a spraying room (11), a sling conveyor belt (12) running through the spraying room (11), and a sling (14) hoisted on the sling conveyor belt (12) and moved into the spraying room (11), a plurality of metal pipes being mounted on the sling (14), characterized in that: A plurality of nesting mechanisms (20) are arranged in the spray booth (11), and the nesting mechanisms (20) include a mounting frame (21) that moves synchronously with the sling (14) and a pushing rail (232) that is installed in the middle section of the spray booth (11). The mounting frame (21) is provided with a slidable sleeve rod (22), a movable abutment rod (23) is embedded in the sleeve rod (22), and a rolling member (231) cooperating with the pushing track (232) is provided on the abutment rod (23), when the rolling member (231) reaches the raised position of the pushing track (232), the sleeve rod (22) is pushed to move by the abutment rod (23), and the movable abutment rod (23) can adjust the distance moved by the sleeve rod (22) when being pushed; The sleeve rod (22) is also provided with a combination frame (24), on which two sealing sleeves (25) are installed. When the sleeve rod (22) moves, the sealing sleeves (25) are sleeved on the ends of the metal pipes to seal them.

2. A metal pipe continuous spraying equipment according to claim 1, characterized in that: The spray booth (11) is provided with an annular circulating transmission belt (26) having the same number as the mounting frames (21); the mounting frames (21) are arranged on the circulating transmission belt (26); and the speed at which the circulating transmission belt (26) drives the mounting frames (21) to move is the same as the speed at which the sling conveyor belt (12) drives the sling (14) to move.

3. The metal pipe continuous spraying equipment according to claim 1, characterized in that: A first sliding block (211) is disposed at the end of the mounting frame (21), a first sliding groove (221) interlocked with the first sliding block (211) is provided on the surface of the sleeve rod (22), a guide rod (222) penetrating the first sliding block (211) is disposed in the first sliding groove (221), and a first spring (223) is wound around the surface of the guide rod (222).

4. The metal pipe continuous spraying equipment according to claim 1, characterized in that: The abutment rod (23) moves in the sleeve rod (22) via a pitch adjustment mechanism (30). The pitch adjustment mechanism (30) comprises an opening groove (31) provided on the sleeve rod (22) and a pitch adjustment gear (33) rotatably arranged on the surface of the abutment rod (23). Teeth (32) that mesh with the pitch adjustment gear (33) are arranged on the opening groove (31). When the pitch adjustment gear (33) rotates, the abutment rod (23) moves out of the sleeve rod (22).

5. The metal pipe continuous spraying equipment according to claim 4, characterized in that: The pitch adjustment mechanism (30) further comprises a receiving groove (35) formed on the abutting rod (23), the receiving groove (35) and the axis position of the pitch adjustment gear (33) being the same, a second clamping block (36) being provided on the inner wall of the receiving groove (35) and a first base (37) being provided in the middle; A rotating rod (38) is rotatably sleeved on the surface of the first base (37), and a second spring (310) is wound around the first base (37) located inside the rotating rod (38), with two ends of the second spring (310) respectively fitting with the first base (37) and the rotating rod (38); The inner wall of the pitch-adjusting gear (33) is provided with a first clamping block (34), and the surface of the rotating rod (38) is provided with a clamping groove (39) engaged with the first clamping block (34) and the second clamping block (36).

6. The metal pipe continuous spraying equipment according to claim 1, characterized in that: An abutment mechanism (40) is arranged inside the sealing sleeve (25), the abutment mechanism (40) comprising a second base (41) arranged inside the sealing sleeve (25), a telescopic rod (42) penetrating the middle of the second base (41), and a third spring (44) arranged inside the second base (41), an abutment plate (43) is arranged at the end of the telescopic rod (42), and a second sliding block (47) is arranged on the abutment plate (43); The sealing sleeve (25) is provided with a second slide groove (45), a threaded rod (46) is rotatably arranged in the second slide groove (45), and a second slider (47) is slidably embedded in the second slide groove (45) and has a threaded hole on its surface that meshes with the threaded rod (46); One end of the threaded rod (46) passes through the second slide groove (45) and is connected to a closing mechanism (50). The closing mechanism (50) comprises a plurality of gate plates (55) that are rotated and unfolded with the threaded rod (46). The ends of the unfolded gate plates (55) are attached to the surface of the metal pipe to fill the gap between the closing sleeve (25) and the metal pipe.

7. The metal pipe continuous spraying equipment according to claim 6, characterized in that: The sealing mechanism (50) further comprises a rotating member (51) rotatably arranged on the sealing sleeve (25) and an annular receiving chamber (52) installed at the end of the sealing sleeve (25); the threaded rod (46) is connected to the rotating member (51) and a driving gear (54) is sleeved and installed on the surface of the rotating member (51); A gear ring (53) meshing with the driving gear (54) is rotatably embedded in the storage cavity (52), and a plurality of driven gears (56) meshing with the gear ring (53) are rotatably arranged on the inner wall of the storage cavity (52); The gate plate (55) is mounted on a driving gear (54) and a plurality of driven gears (56).

8. The metal pipe continuous spraying equipment according to claim 7, characterized in that: The gate plate (55) comprises a connecting portion (551) connected to a driving gear (54) and a plurality of driven gears (56); a closing portion (552) is integrally formed on the connecting portion (551) and is fitted to the outer wall of the metal pipe; a first fitting groove (553) and a second fitting groove (554) are respectively provided on two side surfaces of the closing portion (552); the closing portion (552) rotates with the connecting portion (551) and fits into a second fitting groove (554) provided on the surface of an adjacent closing portion (552).

9. The metal pipe continuous spraying equipment according to claim 7, characterized in that: The threaded rod (46) is connected to the rotating member (51) via a speed change mechanism (60). The speed change mechanism (60) comprises a first bevel gear (61) arranged on the rotating member (51) and four pitch adjustment grooves (63) formed on the surface of the threaded rod (46). Gear teeth (64) are slidably embedded in the pitch adjustment grooves (63). The four gear teeth (64) can be combined into a first bevel gear (61). A rotatable second bevel gear (62) is meshed between the four gear teeth (64) and the first bevel gear (61). Four adjusting rods (65) are provided in meshing rotationally inside the threaded rod (46), and the adjusting rods (65) penetrate into the spacing adjustment grooves (63) and are rotationally connected to the gear teeth (64).

10. A spraying process of a metal pipe continuous spraying equipment, using a metal pipe continuous spraying equipment as claimed in any one of claims 1 to 9, characterized in that: The spraying process includes the following steps: S1. Place the metal pipe on the hanger, and transport the hanger and the metal pipe to the spraying workshop through the hanger; S2. After the hanger and metal pipes arrive at the spraying workshop, point the spray pipe spray port downward to ensure smooth water flow, open the valve for flushing, and remove impurities such as oil, dust, etc. on the surface of the pipe. The pH value of the flushing water is 7-8, and the flushing time is 0.5-1 minute; S3. Use alkaline degreasing liquid to clean the surface of the metal pipe to decompose and remove grease to ensure that the coating can be firmly attached to the workpiece. The pH value of the degreasing liquid is 11-14, and the flushing time is 1 to 2 minutes; S4. Use alkaline degreasing liquid to clean the surface of the metal pipe again, and mix it with surfactant to reduce the surface tension of water, so that grease can be washed away more easily by water. The pH value of the degreasing liquid is 11-14, and the flushing time is 1.5 to 3 minutes; S5. Use a surface conditioner to spray the surface of the metal pipe to form a phosphating film or a chromating film on the surface of the metal pipe to enhance the roughness and polarity of the metal pipe surface, improve the mechanical bite force and chemical bonding force between the metal pipe and the dust during coating, and help ensure that the coating is not easy to fall off or peel off during long-term use; S6. Use phosphating liquid to spray the surface of metal pipes to form a uniform and rough phosphating film on the metal pipes. The phosphating film is porous, so that the powder coating can penetrate into these pores and closely combine with the phosphating film to form a dense coating, so as to enhance the adhesion between the coating and the metal pipe, making the coating more difficult to fall off or peel off; S7. Rinse three times to remove the alkaline degreasing solution, surface conditioner and phosphating solution remaining on the surface of the metal pipe. The pH value of the rinse water is 7-8, and the three rinses last for 0.5 to 1 minute. S8. Transport the hanger and the metal pipe to the drying workshop through the hanger, and bake at 180-200°C for 10-15 minutes to completely remove the moisture on the surface of the metal pipe; S9. After completing the above steps, the metal pipes are inspected. If qualified, the hanger and the metal pipes are transported to the spraying workshop through the hanger. According to the parameters of the metal pipes and the characteristics of the coating, the distance, angle and flow rate between the spray gun and the pipe are adjusted for spraying.

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