CN118594819A - A nitrogen spring cylinder barrel painting system - Google Patents

Abstract

The invention discloses a nitrogen spring cylinder paint spraying processing system, which relates to the technical field of nitrogen spring processing, and comprises a paint spray booth and a plate chain conveying line, wherein a fixed cylinder is arranged on the plate chain conveying line, a movable cylinder is arranged in the fixed cylinder, and a sector plate is arranged outside each movable cylinder; the lifting rings are arranged outside the fixed barrels, guide posts are arranged on the lifting rings, two driving plates are arranged in the paint spraying bin, and guide grooves for driving the lifting rings to lift are formed in the two driving plates; the guide way can drive the lifting ring to rise to make the centre gripping arc board fixed the piston rod, prevent that nitrogen spring from producing to rock, can make sealing membrane, sealing washer and nitrogen spring cylinder bottom butt when the lifting ring rises, prevent vaporific paint and fall on the piston rod, simultaneously, along with the continuation of lifting ring rising, each sector plate rotates down, thereby conveniently spray paint to the cylinder bottom, thereby accomplish the unloading of spraying paint the back, lifting ring and moving cylinder decline convenient nitrogen spring when the cylinder.

Description

A nitrogen spring cylinder barrel painting system

Technical Field

The invention relates to the technical field of nitrogen spring processing, and in particular to a nitrogen spring cylinder barrel painting processing system.

Background Art

The nitrogen spring is a new type of elastic component that uses high-pressure nitrogen as the working medium. It is small in size, large in elasticity, long in stroke, stable in operation, precisely manufactured, long in service life, with a gentle elasticity curve, and does not require pre-tightening, etc. It performs tasks that are difficult to accomplish with conventional elastic components such as metal springs, rubber, and air cushions. Existing nitrogen springs generally include a cylinder, a piston rod, and a guide sleeve, with a sealing ring provided between the piston rod and the guide sleeve for sealing.

For example, the patent with publication number CN208554745U and name "Gas Spring Painting Equipment" includes a butterfly-type electrostatic painting system, a conveying mechanism and a jig; the butterfly-type electrostatic painting system is located on the upper side of the conveying mechanism, the jig is located on the conveying mechanism, and the jig is used to fix the gas spring; the conveying mechanism includes a hollow conveying frame, a first drive unit and a second drive unit; the second drive unit is used to drive the jig to rotate; the butterfly-type electrostatic painting system and the jig are used to simultaneously spray paint multiple gas springs.

Since the nitrogen spring provides buffering elasticity by filling the cylinder with high-pressure nitrogen and compressing the high-pressure nitrogen through the thrust of the piston rod, it is necessary to ensure the seal between the piston rod and the high pass. When painting the cylinder of the nitrogen spring, the piston rod of the nitrogen spring needs to be protected. If the paint adheres to the piston rod, it is easy to cause the nitrogen spring to fail. As in the above-mentioned patent, some prior arts use the self-rotation of the jig to drive the self-rotation of the gas spring for painting. When the piston rod is inserted into the jig and rotated, due to the gap between the piston rod and the inner wall of the jig, the cylinder and piston rod of the nitrogen spring are prone to shaking during self-rotation, which reduces the stability of the self-rotation of the nitrogen spring and may even cause the nitrogen spring to fly out of the jig in severe cases. Moreover, when painting, the shaking nitrogen spring makes it easier for misty paint particles to enter the gap between the jig and the piston rod and adhere to the surface of the piston rod, causing the nitrogen spring to fail.

Summary of the invention

The purpose of the present invention is to provide a nitrogen spring cylinder painting processing system to solve the above-mentioned deficiencies in the prior art.

In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a nitrogen spring cylinder painting processing system, comprising a painting bin, a plate chain conveyor line is arranged in the painting bin, a plurality of fixed cylinders are rotatably arranged on the plate chain conveyor line, a moving cylinder is slidably arranged in each of the fixed cylinders, four fan-shaped plates are rotatably arranged on the top of the outer circumference of each moving cylinder, a sealing film is rotatably arranged on the top of each moving cylinder, and a clamping mechanism is arranged on each of the fixed cylinders; a lifting ring, which is movably arranged on the outer circumference of each fixed cylinder, two guide columns are fixedly arranged on the outer circumference of each lifting ring, two driving plates are fixedly arranged in the painting bin, and guide grooves for driving the lifting ring to lift are opened on the two driving plates, and the guide groove drives the lifting ring to have the following two rising strokes: in the first rising stroke, the lifting ring rises so that the sealing film is closely abutted against the nitrogen spring and the clamping mechanism clamps the nitrogen spring, and at this time, the outer circumference of the nitrogen spring cylinder is sprayed with paint; in the second rising stroke, the lifting ring rises so that each fan-shaped plate drives the sealing film to rotate downward, and at this time, the bottom of the nitrogen spring is sprayed with paint.

Preferably, each of the guide grooves comprises a first rising portion, a first paint spraying portion, a second rising portion, a second paint spraying portion, and a resetting portion, and two first spray guns and two second spray guns are fixedly arranged in the paint spraying chamber.

Preferably, the clamping mechanism comprises four clamping arc plates slidably arranged on the fixed cylinder.

Preferably, a clamping groove is provided on the outer circumferential surface of each movable cylinder, a clamping ring is rotatably arranged in each clamping groove, two first springs are fixedly arranged between the clamping ring and the lifting ring on the same fixed cylinder, and two telescopic rods are fixedly arranged between each clamping ring and the plate chain conveyor line.

Preferably, four gear shafts are rotatably arranged on the outer circumference of each moving cylinder, and a connecting rod is fixedly arranged between the gear shaft and the sector plate on the same moving cylinder.

Preferably, four movable tooth plates are slidably disposed in each movable cylinder, and each movable tooth plate is meshed with each gear shaft in a one-to-one correspondence.

Preferably, a second spring is fixedly provided at one end of each movable tooth plate close to the fixed cylinder.

Preferably, a top ring is fixedly provided on each lifting ring, two fixing rods are fixedly provided between each top ring and the corresponding lifting ring, and two abutment rods are rotatably provided at the bottom of each movable tooth plate.

Preferably, a friction wheel is fixedly provided on the outer peripheral surface of each fixed cylinder, and a rotating scrubbing board is fixedly provided in the paint spraying chamber.

Preferably, a sealing ring is fixedly provided on the top of the moving cylinder.

In the above technical scheme, the present invention provides a nitrogen spring cylinder painting processing system, which has the following beneficial effects: the lifting ring can be driven to rise through the guide groove, so that the clamping arc plate can fix the piston rod to prevent the nitrogen spring from shaking in the fixed cylinder, and the lifting ring can make the sealing film and the sealing ring abut against the bottom end of the nitrogen spring cylinder while rising to prevent the mist paint from falling on the piston rod. At the same time, as the lifting ring continues to rise, each fan-shaped plate rotates downward, thereby facilitating the painting of the bottom end of the cylinder. When the cylinder is finished painting, the lifting ring and the moving cylinder descend to facilitate the unloading of the nitrogen spring.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

FIG1 is a schematic diagram of the overall structure of an embodiment of the present invention;

FIG2 is a schematic structural diagram of a chain conveyor line provided by an embodiment of the present invention;

FIG3 is a schematic diagram of the structure of a guide groove provided in an embodiment of the present invention;

FIG4 is a schematic diagram of the structure of a lifting ring provided in an embodiment of the present invention;

FIG5 is a schematic structural diagram of a clamping ring provided in an embodiment of the present invention;

FIG6 is a schematic diagram of the structure of the fan-shaped plate after it rotates downward according to an embodiment of the present invention;

FIG7 is a schematic diagram of the structure of a moving cylinder provided in an embodiment of the present invention;

FIG8 is a schematic structural diagram of a clamping arc plate provided in an embodiment of the present invention;

FIG. 9 is an enlarged view of the structure at point A in FIG. 7 provided by an embodiment of the present invention.

Description of reference numerals:

1. Paint spraying bin; 2. Bracket; 3. Plate chain conveyor line; 4. Paint box; 5. Connecting pipe; 6. First spray gun; 7. Second spray gun; 11. Driving plate; 12. First rising part; 13. First spray painting part; 14. Second rising part; 15. Second spray painting part; 16. Reset part; 17. Rotating washboard; 18. Friction wheel; 21. Lifting ring; 22. Guide column; 23. Top ring; 24. Fixed rod; 25. Snap ring; 26. Telescopic rod; 27. First spring; 28. Snap groove; 31. Fixed cylinder; 32. Moving cylinder; 33. Clamping arc plate; 34. First inclined surface; 35. Second inclined surface; 36. Groove; 37. Sealing ring; 41. Fan plate; 42. Sealing film; 43. Moving tooth plate; 44. Abutting rod; 45. Second spring; 46. Tooth shaft; 47. Connecting rod.

DETAILED DESCRIPTION

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

Please refer to Figures 1-9, a nitrogen spring cylinder barrel painting processing system includes a painting chamber 1, a plate chain conveyor line 3 is arranged in the painting chamber 1, a plurality of fixed cylinders 31 are rotatably arranged on the plate chain conveyor line 3, a moving cylinder 32 is slidably arranged in each fixed cylinder 31, four fan-shaped plates 41 are rotatably arranged on the top of the outer circumference of each moving cylinder 32, a sealing film 42 is rotatably arranged on the top of each moving cylinder 32, and a clamping mechanism is arranged on each fixed cylinder 31; a lifting ring 21 is movably arranged on the outer circumference of each fixed cylinder 31, and two lifting rings 21 are fixedly arranged on the outer circumference of each lifting ring 21 A guide column 22 and two drive plates 11 are fixedly arranged in the paint spraying chamber 1. Guide grooves for driving the lifting ring 21 to rise and fall are provided on the two drive plates 11. The guide groove drives the lifting ring 21 to have the following two rising strokes: in the first rising stroke, the lifting ring 21 rises so that the sealing film 42 is in close contact with the nitrogen spring and the clamping mechanism clamps the nitrogen spring, and at this time, the outer peripheral surface of the nitrogen spring cylinder is sprayed with paint; in the second rising stroke, the lifting ring 21 rises so that each fan-shaped plate 41 drives the sealing film 42 to rotate downward, and at this time, the bottom of the nitrogen spring is sprayed with paint.

Specifically, brackets 2 are provided at both ends of the plate chain conveyor line 3, and the plate chain conveyor line 3 runs through the paint spraying bin 1. As shown in FIG1 , loading is performed on the plate chain conveyor line 3 on the right side of the paint spraying bin 1, and unloading is performed on the plate chain conveyor line 3 on the left side of the paint spraying bin 1. The fixed cylinder 31 is used to insert the piston rod of the nitrogen spring. The plate chain conveyor line 3 is used to convey the moving cylinder 32. The fan-shaped plates 41 on each moving cylinder 32 are fixedly connected to the sealing film 42 on the same moving cylinder 32. The sealing film 42 has a certain elasticity and thickness. The lifting ring 21 can rotate and slide on the outer circumference of the fixed cylinder 31, and the moving cylinder 32 can only slide up and down in the fixed cylinder 31. The guide grooves of the two driving plates 11 are used to drive the guide column 22 to rise and fall, thereby bringing The lifting ring 21 is moved up and down, and the lifting ring 21 can only slide up and down on the plate chain conveyor line 3. In the initial state, the lifting ring 21 is located at the bottom of the fixed cylinder 31. The piston rod of the nitrogen spring is inserted into the movable cylinder 32. At this time, the lower end of the nitrogen spring cylinder is at a certain distance from the top of the movable cylinder 32. The plate chain conveyor line 3 is started, and the guide column 22 gradually extends into the corresponding guide groove. With the conveyance of the plate chain conveyor line 3, the guide groove first drives the two guide columns 22 to move upward. At this time, the lifting ring 21 also moves upward and lifts the movable cylinder 32. With the upward movement of the lifting ring 21, the clamping device clamps the piston rod of the nitrogen spring. At this time, the piston rod of the nitrogen spring is fixed in the fixed cylinder 31. As the lifting ring 21 continues to rise, the sealing film 42 is tightly abutted against the bottom of the nitrogen spring through the fan-shaped plate 41, and the sealing film 42 blocks the lower end surface of the nitrogen spring cylinder to prevent paint particles from passing through the gap between the cylinder and the moving cylinder 32 and adhering to the piston rod when the outer peripheral surface of the cylinder is sprayed with paint. When the outer peripheral surface of the cylinder is sprayed with paint, the lifting ring 21 continues to move upward through the guide groove. When the lifting ring 21 moves upward, the fan-shaped plates 41 are driven to drive the sealing film 42 to flip downward. When the sealing film 42 flips downward, the bottom of the cylinder is exposed, and the bottom of the cylinder is sprayed with paint at this time. When the outer peripheral surface of the cylinder is sprayed with paint, the sealing film 42 abuts against the bottom of the cylinder to prevent paint particles from falling on the piston rod. , and at the same time, the bottom of the cylinder is isolated from the paint. When the sealing film 42 rotates downward, the bottom of the cylinder can be exposed, thereby completing the comprehensive painting of the cylinder and reducing the probability of paint particles falling on the piston rod. After the bottom of the cylinder is painted, with the transportation of the plate chain conveyor line 3, the lifting ring 21 moves downward through the guide groove. When the lifting ring 21 moves downward, the fan-shaped plate 41 returns to its original position, and the moving cylinder 32 also decreases. At this time, the clamping of the piston rod is released, and there is a certain distance between the bottom of the cylinder and the top of the moving cylinder 32. The piston rod is also partially exposed from the top of the moving cylinder 32. At this time, taking the piston rod part between the cylinder and the moving cylinder 32 can easily remove the painted nitrogen spring from the plate chain conveyor line 3.

In another embodiment of the present invention: each guide groove includes a first rising portion 12, a first paint spraying portion 13, a second rising portion 14, a second paint spraying portion 15, and a reset portion 16, and two first spray guns 6 and two second spray guns 7 are fixedly arranged in the paint spraying chamber 1; the first rising portion 12, the first paint spraying portion 13, the second rising portion 14, the second paint spraying portion 15, and the reset portion 16 on each driving plate 11 are connected together, the first paint spraying portion 13 and the second paint spraying portion 15 are both arranged horizontally, the first rising portion 12 and the second rising portion 14 are arranged obliquely upward, and the first The spray gun 6 is used to spray paint on the outer peripheral surface of the nitrogen spring cylinder. The spray port of the second spray gun 7 is inclined upward and is used to spray paint on the bottom of the cylinder. When the two guide posts 22 of the lifting ring 21 move into the guide groove along with the plate chain conveyor line 3, the lifting ring 21 is driven to rise for the first time through the first rising part 12. At this time, the lifting ring 21 drives the moving cylinder 32 to rise and drives the clamping mechanism to clamp the piston rod. At this time, the piston rod is fixed. As the lifting ring 21 rises, the top of the moving cylinder 32 is tightly against the bottom of the nitrogen spring cylinder. The first spray gun 6 is connected together, and the first spray gun 6 is located on the upper side of the first spray painting part 13. When the guide column 22 moves to the first spray painting part 13 of the guide groove, the cylinder barrel is sprayed with paint by the first spray gun 6. As the guide column 22 moves to the second rising part 14, the lifting ring 21 also rises again. At this time, the lifting ring 21 no longer drives the moving cylinder 32 to rise, but drives the outer part of each sector plate 41 to flip downward. At this time, the sealing film 42 also moves downward, thereby exposing the blocked bottom of the cylinder barrel. When the guide column 22 moves to the second spray painting part 15, the second spray gun 6 is used to spray paint the cylinder barrel. The gun 7 sprays paint on the bottom of the cylinder. The second spray gun 7, which is arranged obliquely upward, abuts against the top of the moving cylinder 32 and the bottom of the cylinder to prevent paint particles from falling on the piston rod, thereby protecting the piston rod. After the bottom end face of the cylinder is painted, each guide column 22 enters the corresponding reset portion 16, so that the lifting ring 21 and the moving cylinder 32 move downward, thereby exposing a part of the piston rod for easy unloading. A paint box 4 is fixedly provided outside the paint spraying bin 1, and a connecting pipe 5 is fixedly connected between each first spray gun 6, the second spray gun 7 and the paint box 4.

Specifically, the clamping mechanism includes four clamping arc plates 33 slidably arranged on the fixed cylinder 31; each clamping arc plate 33 is provided with a first inclined surface 34 near the inner top of the movable cylinder 32, and each clamping arc plate 33 is provided with a second inclined surface 35 near the outer bottom of the lifting ring 21. When the piston rod is inserted into the movable cylinder 32, the end of the piston rod abuts against the first inclined surface 34 to push each clamping arc plate 33 outward, so that a part of the clamping arc plate 33 is exposed outside the fixed cylinder 31, and the first inclined surface 35 is used to push each clamping arc plate 33 outward. 34 facilitates the insertion of the piston rod into the fixed cylinder 31. When the lifting ring 21 rises, the lifting ring 21 abuts against the second inclined surface 35 of each clamping arc plate 33 to push the clamping arc plate 33 into the fixed cylinder 31. At this time, the inner wall of the clamping arc plate 33 tightly abuts against the piston rod, so that the piston cylinder is clamped in the fixed cylinder 31 through the clamping arc plate 33. A groove 36 for avoiding the clamping arc plate 33 is provided on the movable cylinder 32, and the part of the clamping arc plate 33 close to the movable cylinder 32 is made of elastic rubber material.

Furthermore, a clamping groove 28 is provided on the outer circumference of each moving cylinder 32, and a clamping ring 25 is rotatably arranged in each clamping groove 28. Two first springs 27 are fixedly arranged between the clamping ring 25 and the lifting ring 21 on the same fixed cylinder 31, and two telescopic rods 26 are fixedly arranged between each clamping ring 25 and the plate chain conveyor line 3; the two telescopic rods 26 are fixed on the plate chain conveyor line 3, and the lifting ring 21 is slidably connected to the corresponding two telescopic rods 26, and the lifting ring 21 can only move up and down through the two telescopic rods 26. The plate chain conveyor line 3 has a plurality of chain plates, and the fixed cylinder 31 and the two telescopic rods 26 on the same fixed cylinder 31 are fixed on the same chain plate. When the clamping ring 25 is raised or lowered, the moving cylinder 32 is raised or lowered at the same time through the clamping groove 28, and each first spring 27 is sleeved on each telescopic rod 26 in a one-to-one correspondence. The outer peripheral surface of the nitrogen spring is sprayed with paint, and the paint particles blown vertically to the piston rod can be prevented from adhering to the piston rod through the moving cylinder 32 and the sealing film 42. When the guide column 22 drives the lifting ring 21 to rise through the guide column 22, the clamping ring 25 is driven to rise through the first spring 27, thereby driving the moving cylinder 32 to rise. At this time, the telescopic rod 26 is extended, and there is a certain gap between the inner wall of the moving cylinder 32 and the piston rod. When the telescopic rod 26 is extended to the limit, the clamping ring 25 and the moving cylinder 32 will not rise any more. At this time, the piston rod is clamped, and the sealing film 42 and the top of the moving cylinder 32 are both in contact with the lower end of the cylinder of the nitrogen spring. At this time, the outer peripheral surface of the nitrogen spring is sprayed with paint, and the moving cylinder 32 and the sealing film 42 can prevent the paint particles blown vertically to the piston rod from adhering to the piston rod. When the guide column 22 enters the second rising portion 14, the moving cylinder 32 and the clamping ring 25 no longer rise. At this time, the rise of the lifting ring 21 will cause the two first springs 27 to be compressed.

In another embodiment of the present invention: four gear shafts 46 are rotatably provided on the outer circumference of each moving cylinder 32, and a connecting rod 47 is fixedly provided between the gear shaft 46 and the fan-shaped plate 41 on the same moving cylinder 32; there are two connecting rods 47 on each gear shaft 46, and they are respectively fixed at both ends of the gear shaft 46. When the gear shaft 46 rotates, the two connecting rods 47 can drive the corresponding fan-shaped plate 41 to rotate, thereby driving the sealing membrane 42 to rotate downward, and then exposing the bottom of the cylinder, and the end of the connecting rod 47 away from the gear shaft 46 is fixed to the lower side of the corresponding fan-shaped plate 41.

Specifically, four movable tooth plates 43 are slidably disposed in each movable cylinder 32, and each movable tooth plate 43 is meshed with each gear shaft 46 in a one-to-one correspondence; when the movable tooth plate 43 moves up and down, it can drive the corresponding gear shaft 46 to rotate, thereby driving each sector plate 41 to rotate;

A second spring 45 is fixedly provided at one end of each movable tooth plate 43 close to the fixed cylinder 31; when the movable tooth plate 43 moves upward, it can drive the corresponding gear shaft 46 to rotate, so that the sector plate 41 rotates downward. When the lower end surface of the cylinder of the nitrogen spring is painted, the movable tooth plate 43 is pulled downward by the second spring 45, so that the downward rotating sector plate 41 returns to its initial position;

Furthermore, each lifting ring 21 is fixedly provided with a top ring 23, and two fixed rods 24 are fixedly provided between each top ring 23 and the corresponding lifting ring 21, and two abutment rods 44 are rotatably provided at the bottom of each movable tooth plate 43; when the guide column 22 rises and separates from the first rising part 12, the telescopic rod 26 is extended to the limit, and the movable cylinder 32 no longer rises at this time. As the guide column 22 enters the second rising part 14, the lifting ring 21 continues to rise. At this time, the lifting ring 21 drives the top ring 23 to rise through the fixed rod 24, and the top ring 23 abuts against the abutment rods 44 during the rising process, thereby driving the movable tooth plate 43 to move upward, and then causing each fan-shaped plate 41 to rotate downward, thereby exposing the lower end surface of the cylinder.

In another embodiment of the present invention: a friction wheel 18 is fixedly provided on the outer circumferential surface of each fixed cylinder 31, and a rotating rubbing board 17 is fixedly provided in the paint spraying chamber 1; the rotating rubbing board 17 is fixedly connected to one of the driving plates 11, and the rotating rubbing board 17 is located at the lower side of the guide groove. When the plate chain conveyor line 3 drives each fixed cylinder 31 to move, the friction wheel 18 is rotated through the contact between the rotating rubbing board 17 and the friction wheel 18, thereby driving the moving cylinder 32 and the fixed cylinder 31 to rotate. When spraying paint, the nitrogen spring cylinder is caused to rotate, thereby improving the paint spraying efficiency.

Specifically, a sealing ring 37 is fixedly provided on the top of the movable cylinder 32; when the sealing film 42 is turned downward, the sealing ring 37 is still in contact with the bottom of the cylinder; when each sector plate 41 is perpendicular to the movable cylinder 32, the height of the sealing ring 37 is consistent with the height of the sealing film 42; when the cylinder of the nitrogen spring is sprayed with paint, the sealing ring 37 prevents mist paint from falling on the piston cylinder.

The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that, for those skilled in the art, the described embodiments can be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims (10)

1. A nitrogen spring cylinder painting processing system, comprising a painting chamber (1), characterized in that a plate chain conveyor line (3) is arranged in the painting chamber (1), a plurality of fixed cylinders (31) are rotatably arranged on the plate chain conveyor line (3), a moving cylinder (32) is slidably arranged in each of the fixed cylinders (31), four sector plates (41) are rotatably arranged on the top of the outer peripheral surface of each of the moving cylinders (32), a sealing film (42) is rotatably arranged on the top of each of the moving cylinders (32), and a clamping mechanism is arranged on each of the fixed cylinders (31); A lifting ring (21) is movably arranged on the outer circumference of each of the fixed cylinders (31), and two guide pillars (22) are fixedly arranged on the outer circumference of each of the lifting rings (21). Two driving plates (11) are fixedly arranged in the paint spraying chamber (1), and guide grooves for driving the lifting ring (21) to move upward and downward are formed on the two driving plates (11). The guide grooves drive the lifting ring (21) to have the following two ascending strokes: In the first ascending stroke, the lifting ring (21) rises so that the sealing film (42) is in close contact with the nitrogen spring and the clamping mechanism clamps the nitrogen spring, and at this time, the outer peripheral surface of the nitrogen spring cylinder is sprayed with paint; In the second ascending stroke, the lifting ring (21) rises so that each sector plate (41) drives the sealing membrane (42) to rotate downward, and at this time, the bottom of the nitrogen spring is sprayed with paint. 2. A nitrogen spring cylinder painting processing system according to claim 1, characterized in that each of the guide grooves comprises a first rising portion (12), a first painting portion (13), a second rising portion (14), a second painting portion (15), and a reset portion (16), and two first spray guns (6) and two second spray guns (7) are fixedly arranged in the paint spraying chamber (1). 3. A nitrogen spring cylinder barrel painting processing system according to claim 2, characterized in that the clamping mechanism comprises four clamping arc plates (33) slidably arranged on the fixed cylinder (31). 4. A nitrogen spring cylinder painting processing system according to claim 3, characterized in that a clamping groove (28) is provided on the outer circumferential surface of each of the movable cylinders (32), a clamping ring (25) is rotatably arranged in each of the clamping grooves (28), two first springs (27) are fixedly arranged between the clamping ring (25) and the lifting ring (21) on the same fixed cylinder (31), and two telescopic rods (26) are fixedly arranged between each of the clamping rings (25) and the plate chain conveyor line (3). 5. A nitrogen spring cylinder painting processing system according to claim 4, characterized in that four gear shafts (46) are rotatably arranged on the outer circumference of each of the moving cylinders (32), and a connecting rod (47) is fixedly arranged between the gear shaft (46) and the fan-shaped plate (41) on the same moving cylinder (32). 6. A nitrogen spring cylinder painting processing system according to claim 5, characterized in that four movable tooth plates (43) are slidably arranged in each of the movable cylinders (32), and each of the movable tooth plates (43) is meshed with each gear shaft (46) in a one-to-one correspondence. 7. A nitrogen spring cylinder painting processing system according to claim 6, characterized in that a second spring (45) is fixedly provided on one end of each movable tooth plate (43) close to the fixed cylinder (31). 8. A nitrogen spring cylinder painting processing system according to claim 7, characterized in that a top ring (23) is fixedly provided on each lifting ring (21), two fixing rods (24) are fixedly provided between each top ring (23) and the corresponding lifting ring (21), and two abutment rods (44) are rotatably provided at the bottom of each movable tooth plate (43). 9. A nitrogen spring cylinder painting processing system according to claim 8, characterized in that a friction wheel (18) is fixedly provided on the outer peripheral surface of each of the fixed cylinders (31), and a rotating scrubbing plate (17) is fixedly provided in the paint spraying chamber (1). 10. A nitrogen spring cylinder painting processing system according to claim 9, characterized in that a sealing ring (37) is fixedly provided on the top of the moving cylinder (32).