Liquid coating spraying system

Abstract

The invention relates to a liquid paint spraying system which comprises a liquid paint spraying gun, a liquid paint gear pump, a liquid paint conveying pipeline and a liquid paint box, the liquid paint gear pump comprises a pump body, a driving shaft, a driven shaft, a driving gear and a driven gear, the pump body comprises a shell, a top plate and a bottom plate, and a bearing support is fixedly installed on the top plate; a bearing is installed in the middle of the driving shaft, an inner ring of the bearing is matched with the shaft wall of the driving shaft, and an outer ring of the bearing is matched with the bearing support. A first sealing ring, a second sealing ring and a third sealing ring are installed in an area defined by the driving shaft, the driving gear, the top plate, the bearing support and the bearing, and a sealing assembly composed of the first sealing ring, the second sealing ring and the third sealing ring is used for storing a lubricating liquid isolation cabin of lubricating liquid. The liquid coating spraying system solves the problem that an existing liquid coating gear pump is short in service life or unstable in service life, and meanwhile the service life of a sealing piece of the liquid coating gear pump is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying systems, and in particular to a liquid paint spraying system. Background Art

[0002] Currently, in the painting industry, liquid paints are used in the largest proportion, generally including fluorocarbon paints and waterborne paints. Liquid paint is a common surface decoration material, widely used in fields such as construction, furniture, and automobiles. It has characteristics such as good covering property, rich colors, and convenient construction. The composition of liquid paint is a mixture of various different components, including solvents, resins, pigments, additives, etc.

[0003] As the core power component in the spraying system, the gear pump plays a key role in paint delivery, pressure control, and process stability. During the spraying process, a high-precision gear pump is required to transport and meter the paint in the spraying system to ensure a stable and controllable paint output of the spraying tool. At the same time, the liquid pressure can be adjusted during the operation of the gear pump. However, the gear pump is a long-term operating device, with gears meshing with each other and a sliding friction pair between the gear and the pump body. Therefore, the service life of the gear pump is a major problem. In addition, the wear of the gears or the pump body will cause unstable paint supply flow, resulting in jitter or leakage, and causing poor spraying.

[0004] As Figure 1 shown, in the prior art, when the drive shaft 1 ’ is poorly assembled or subjected to a lateral force, the gear shaft will deflect, and then drive the gear to deflect. When the drive shaft 1 ’ deflects, local wear positions will occur: the first local wear position 4 ’ is the position between the gear tip and the top plate 2 ’ ; the second local wear position 5 ’ is the position between the drive shaft 1 ’ and the seal; the third local wear position 6 ’ is the position of the gear meshing point; the fourth local wear position 7 ’ is the position between the gear and the bottom plate 3 ’ ; Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, a liquid paint spraying system is provided, which solves the problem of low or unstable service life of the liquid paint gear pump in the existing spraying system, and at the same time improves the service life of the seal of the liquid paint gear pump in the spraying system.

[0006] The technical solution adopted by the present invention is as follows: A liquid paint spraying system includes a liquid paint spray gun, a liquid paint gear pump, a liquid paint delivery pipeline, and a liquid paint tank. One end of the liquid paint gear pump is connected to the liquid paint spray gun through the liquid paint delivery pipeline, and the other end of the liquid paint gear pump is connected to the liquid paint tank through the liquid paint delivery pipeline. The liquid paint gear pump includes a pump body, a drive shaft, a driven shaft, a driving gear, and a driven gear. The pump body includes a housing, a top plate, and a bottom plate. The top plate is fixedly installed at the top of the housing, and the bottom plate is fixedly installed at the bottom of the housing. The driving gear and the driven gear are located inside the housing. The drive shaft and the driven shaft are arranged in parallel on the pump body, and one end of the drive shaft extends out from the top plate. The driving gear is fixedly connected to the drive shaft, and the driven gear is assembled on the driven shaft. A liquid paint inlet and a liquid paint outlet are provided on the top plate. Liquid paint enters through the liquid paint inlet. After the drive shaft rotates, it drives the driving gear to rotate. The driven gear that meshes and drives with the driving gear rotates on the driven shaft, and the liquid paint is discharged from the liquid paint outlet. A bearing bracket is fixedly installed on the top plate. A bearing is installed in the middle of the drive shaft. The inner ring of the bearing is fitted with the shaft wall of the drive shaft, and the outer ring of the bearing is fitted with the bearing bracket. A first sealing ring, a second sealing ring, and a third sealing ring are installed in the area surrounded by the drive shaft, the driving gear, the top plate, the bearing bracket, and the bearing. The sealing assembly composed of the first sealing ring, the second sealing ring, and the third sealing ring is a lubricating liquid isolation chamber for storing lubricating liquid.

[0007] Further specifically defined, in the above technical solution, the first sealing ring is pressed against the bearing, the third sealing ring is pressed against the top plate, and the second sealing ring is located between the first sealing ring and the third sealing ring.

[0008] Further specifically defined, in the above technical solution, the first sealing ring is a lip-shaped sealing ring, the second sealing ring is an O-ring, and the third sealing ring is an O-ring.

[0009] Further specifically defined, in the above technical solution, the liquid paint gear pump further includes an indicating tube, and the indicating tube is communicated with the lubricating liquid isolation chamber.

[0010] Further specifically defined, in the above technical solution, an exhaust port is provided at the top of the indicating tube, and an exhaust plug is inserted into the exhaust port.

[0011] Further specifically defined, in the above technical solution, an oil filling port is provided on the bearing bracket, and a sealing cover is inserted into the oil filling port.

[0012] Further specifically defined, in the above technical solution, the liquid paint inlet and the liquid paint outlet are symmetrically distributed on both sides of the axis of the top plate.

[0013] Further specifically defined, in the above technical solution, both the driving gear and the driven gear are cylindrical gears.

[0014] Further specifically defined, in the above technical solution, the indicating tube is made of a transparent material, and scale lines are provided on the tube wall of the indicating tube.

[0015] Further specifically defined, in the above technical solution, the specifications of the driving gear and the specifications of the driven gear are the same.

[0016] The present invention has the following advantages compared with the prior art: The liquid paint spraying system of the present invention innovatively designs the liquid paint gear pump therein. By installing and fixing a bearing bracket at the top plate of the pump body of the liquid paint gear pump, by adding a bearing in the middle of the driving shaft of the liquid paint gear pump, and through a precise assembly relationship, the inner ring of the bearing cooperates with the shaft wall of the driving shaft, and the outer ring of the bearing cooperates with the bearing bracket, so that the driving shaft is not prone to yaw; after the driving shaft is supported by the bearing, the driving shaft will not yaw, and thus the gear will not yaw either. In this way, the force on the gear can be uniform, the wear can be uniform, and the service life of the gear with uniform wear is much longer than the service life of the gear with local wear; the driving shaft will not yaw, the sealing assembly is uniformly stressed and worn, and the service life of the sealing assembly with uniform wear will also be much longer than the service life of the sealing assembly with local wear; and by designing a special lubricating fluid isolation chamber and filling it with lubricating fluid, as the driving shaft rotates, the lubricating fluid will continuously lubricate the sealing assembly, thereby greatly improving the service life of the sealing assembly. And by providing an indicating tube and an oil filling port on the liquid paint gear pump, it can be observed and refilled in time when the lubricating fluid is lacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of local wear after the driving shaft of the liquid paint gear pump in the existing spraying system yaws.

[0018] Figure 1 The reference numerals in ’ are: 1 ’ 、driving shaft; 2 ’ 、top plate; 3 ’ 、bottom plate; 4 ’ 、the first local wear position; 5 ’ 、the second local wear position; 6 ’ 、the third local wear position; 7

[0019] Figure 2 is a schematic structural diagram of the liquid paint gear pump in the spraying system of the present invention; Figure 3 is Figure 2 a sectional view of; Figure 4 is the working principle diagram of the liquid paint gear pump in the spraying system of the present invention.

[0020] Figures 2 to 4 The reference numerals in [[ ]] are: 1, drive shaft; 2, driven shaft; 3, driving gear; 4, driven gear; 5, top plate; 6, liquid paint inlet; 7, liquid paint outlet; 8, bearing bracket; 9, bearing; 10, first sealing ring; 11, second sealing ring; 12, third sealing ring; 13, liquid paint; 14, indicating tube; 15, exhaust plug; 16, sealing cover; 17, housing; 18, bottom plate; 19, lubricating fluid. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] See [[ ]] Figure 2 , Figure 3 and Figure 4, a liquid paint spraying system of the present invention includes a liquid paint spray gun, a liquid paint gear pump, a liquid paint delivery pipeline, and a liquid paint tank. One end of the liquid paint gear pump is connected to the liquid paint spray gun through the liquid paint delivery pipeline, and the other end of the liquid paint gear pump is connected to the liquid paint tank through the liquid paint delivery pipeline. The liquid paint gear pump includes a pump body, a drive shaft 1, a driven shaft 2, a driving gear 3, and a driven gear 4. The pump body includes a housing 17, a top plate 5, and a bottom plate 18. The top plate 5 is fixedly installed at the top of the housing 17, and the bottom plate 18 is fixedly installed at the bottom of the housing 17. The driving gear 3 and the driven gear 4 are located inside the housing. The drive shaft 1 and the driven shaft 2 are arranged in parallel on the pump body, and one end of the drive shaft 1 extends out from the top plate 5. The driving gear 3 is fixedly connected to the drive shaft 1, and the driven gear 4 is assembled on the driven shaft 2; a liquid paint inlet 6 and a liquid paint outlet 7 are provided on the top plate 5. The liquid paint 13 enters through the liquid paint inlet 6. After the drive shaft 1 rotates, it drives the driving gear 3 to rotate. The driven gear 4 that meshes and drives with the driving gear 3 rotates on the driven shaft 2, and the liquid paint 13 is discharged from the liquid paint outlet 7; a bearing bracket 8 is fixedly installed on the top plate 5. A bearing 9 is installed in the middle of the drive shaft 1. The inner ring of the bearing 9 cooperates with the shaft wall of the drive shaft 1, and the outer ring of the bearing 9 cooperates with the bearing bracket 8; within the area surrounded by the drive shaft 1, the driving gear 3, the top plate 5, the bearing bracket 8, and the bearing 9, a first sealing ring 10, a second sealing ring 11, and a third sealing ring 12 are installed. The sealing assembly composed of the first sealing ring 10, the second sealing ring 11, and the third sealing ring 12 is a lubricating liquid isolation chamber for storing the lubricating liquid 19.

[0023] Among them, the liquid paint gear pump is applied to the transportation and metering of the liquid paint 13 in the spraying system. Of course, the liquid paint gear pump in the present invention can also be applied to the fluid transportation and metering of other spraying systems.

[0024] The first sealing ring 10 is tightly attached to the bearing 9, the third sealing ring 12 is tightly attached to the top plate 5, and the second sealing ring 11 is located between the first sealing ring 10 and the third sealing ring 12. The first sealing ring 10 is a lip-shaped sealing ring, the second sealing ring 11 is an O-shaped sealing ring, and the third sealing ring 12 is an O-shaped sealing ring.

[0025] The liquid paint gear pump further includes an indicating tube 14, and the indicating tube 14 is communicated with the lubricating liquid isolation chamber. An oil filling port is provided on the bearing bracket 8, and a sealing cap 16 is plugged in the oil filling port. An exhaust port is provided at the top of the indicating tube 14, and an exhaust plug 15 is plugged in the exhaust port. The liquid paint inlet 6 and the liquid paint outlet 7 are symmetrically distributed on both sides of the axis of the top plate 5. Both the driving gear 3 and the driven gear 4 are cylindrical gears. The indicating tube 14 is made of a transparent material, and scale lines are provided on the tube wall of the indicating tube 14. Preferably, the specifications of the driving gear 3 and the driven gear 4 are the same.

[0026] The liquid coating gear pump is driven by the rotation of the motor to drive the rotation of the drive shaft 1 of the liquid coating gear pump. A gear pair is installed on the drive shaft 1 and the driven shaft 2, and the working volume formed between the pump body and the meshing gears changes and moves to transport and meter the liquid.

[0027] As Figure 4 shown in the figure, it is the working principle diagram of the liquid coating gear pump. The liquid coating 13 enters from the liquid coating inlet 6. The drive shaft 1 drives the active gear 3 to rotate as shown in the figure. The driven gear 4 meshes with the active gear 3 and rotates together. The liquid coating 13 runs in the closed space and is discharged from the liquid coating outlet 7.

[0028] As Figure 2 shown in the figure, in the present invention, when the lubricating liquid 19 is filled, the lubricating liquid 19 can be observed in the indicating tube 14. When the liquid level drops to the point where it cannot be observed, the lubricating liquid 19 needs to be filled. Remove the sealing cover 16 and loosen the exhaust plug 15, then the lubricating liquid 19 can be filled. When the liquid level of the lubricating liquid 19 is restored, tighten the exhaust plug 15 and then cover the sealing cover 16.

[0029] As Figure 3 shown in the figure, in the present invention, the lubricating liquid isolation chamber is composed of the first sealing ring 10 (lip sealing ring), the second sealing ring 11 (O-shaped sealing ring), and the third sealing ring 12 (O-shaped sealing ring). The lubricating liquid 19 is stored in the lubricating liquid isolation chamber. The drive shaft 1 is fixedly connected to the active gear 3. The driven gear 4 is assembled with the driven shaft 2, and the driven gear 4 can rotate on the driven shaft 2. The top plate 5, the housing 17, and the bottom plate 18 together form the pump body of the liquid coating gear pump. The drive shaft 1 rotates, driving the active gear 3 to rotate, and the meshing driven gear 4 rotates on the driven shaft 2. The inner ring of the bearing 9 is fitted with the drive shaft 1, the outer ring of the bearing 9 is fitted with the bearing bracket 8, and the bearing bracket 8 is installed and fixed on the top plate 5 of the liquid coating gear pump, effectively ensuring that the drive shaft 1 will not deflect.

[0030] The liquid coating spraying system of the present invention solves the problems of low or unstable service life of the existing liquid coating gear pump, and at the same time improves the service life of the seal of the liquid coating gear pump. Specifically, the present invention solves the problems that the yaw of the drive shaft 1 causes poor meshing between gears, resulting in rapid wear of the gears; the yaw of the drive shaft 1 causes one-sided contact between the gear and the pump body, resulting in increased wear; the yaw of the drive shaft 1 causes uneven force on the shaft and the seal, resulting in increased wear on one side; and the problem that the seal is worn due to poor lubrication during long-term use. Specifically, the liquid coating spraying system of the present invention has made an innovative design for the liquid coating gear pump therein. By installing a fixed bearing bracket 8 at the top plate 5 of the pump body of the liquid coating gear pump, adding a bearing 9 in the middle of the drive shaft 1 of the liquid coating gear pump, and through a precise assembly relationship, the inner ring of the bearing 9 is fitted with the shaft wall of the drive shaft 1, and the outer ring of the bearing 9 is fitted with the bearing bracket 8, so that the drive shaft 1 is not easily yawed; after the drive shaft 1 is supported by the bearing 9, the drive shaft 1 will not yaw, and thus the gear will not yaw either. In this way, the force on the gear can be uniform, the wear can be uniform, and the service life of the gear with uniform wear is much longer than that of the gear with local wear; the drive shaft 1 will not yaw, the sealing assembly is evenly stressed and evenly worn, and the service life of the sealing assembly with uniform wear will also be much longer than that of the sealing assembly with local wear; and by designing a special lubricating fluid isolation chamber with a built-in lubricating fluid 19, as the drive shaft 1 rotates, the lubricating fluid 19 will continuously lubricate the sealing assembly, thereby greatly improving the service life of the sealing assembly, and by providing an indicating pipe 14 and an oil filling port on the liquid coating gear pump, it can be observed and refilled in time when the lubricating fluid 19 is lacking.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A liquid coating spraying system, characterized in that: The invention comprises a liquid paint spray gun, a liquid paint gear pump, a liquid paint delivery pipeline and a liquid paint box, wherein one end of the liquid paint gear pump is connected to the liquid paint spray gun via the liquid paint delivery pipeline, and the other end of the liquid paint gear pump is connected to the liquid paint box via the liquid paint delivery pipeline. The liquid paint gear pump comprises a pump body, a drive shaft (1), a driven shaft (2), a driving gear (3) and a driven gear (4). The pump body comprises a shell (17), a top plate (5) and a bottom plate (18). The top plate (5) is fixedly mounted on the top end of the shell (17), and the bottom plate (18) is fixedly mounted on the bottom end of the shell (17). The driving gear (3) and the driven gear (4) are located in the shell. The drive shaft (1) and the driven shaft (2) are arranged in parallel on the pump body, and one end of the drive shaft (1) extends from the top plate (5). The driving gear (3) is fixedly connected to the drive shaft (1), and the driven gear (4) is assembled on the driven shaft (2). The top plate (5) is provided with a liquid coating inlet (6) and a liquid coating outlet (7), and the liquid coating (13) enters through the liquid coating inlet (6), and the driving shaft (1) rotates to drive the driving gear (3) to rotate, and the driven gear (4) meshing with the driving gear (3) rotates on the driven shaft (2), and the liquid coating (13) is discharged from the liquid coating outlet (7); A bearing bracket (8) is fixedly mounted on the top plate (5), a bearing (9) is mounted in the middle of the drive shaft (1), an inner ring of the bearing (9) cooperates with the shaft wall of the drive shaft (1), and an outer ring of the bearing (9) cooperates with the bearing bracket (8); A first sealing ring (10), a second sealing ring (11) and a third sealing ring (12) are installed in an area surrounded by the drive shaft (1), the driving gear (3), the top plate (5), the bearing bracket (8) and the bearing (9); the sealing assembly composed of the first sealing ring (10), the second sealing ring (11) and the third sealing ring (12) is used for storing a lubricating fluid isolation chamber for a lubricating fluid (19).

2. A liquid coating spraying system according to claim 1, characterized in that: The first sealing ring (10) is tightly attached to the bearing (9), the third sealing ring (12) is tightly attached to the top plate (5), and the second sealing ring (11) is located between the first sealing ring (10) and the third sealing ring (12).

3. A liquid coating spraying system according to claim 1 or 2, characterized in that: The first sealing ring (10) is a lip sealing ring, the second sealing ring (11) is an O-type sealing ring, and the third sealing ring (12) is an O-type sealing ring.

4. A liquid coating spraying system according to claim 1, characterized in that: The liquid coating gear pump further comprises an indicator tube (14), wherein the indicator tube (14) is in communication with the lubricating liquid isolation chamber.

5. A liquid coating spraying system according to claim 4, characterized in that: The top of the indicator tube (14) is provided with an exhaust port, and an exhaust plug (15) is plugged in the exhaust port.

6. A liquid coating spraying system according to claim 5, characterized in that: The bearing bracket (8) is provided with an oil filling port, and a sealing cover (16) is plugged in the oil filling port.

7. A liquid coating spraying system according to claim 1, characterized in that: The liquid coating inlet (6) and the liquid coating outlet (7) are symmetrically distributed on both sides of the axis of the top plate (5).

8. A liquid coating spraying system according to claim 1, characterized in that: The driving gear (3) and the driven gear (4) are both cylindrical gears.

9. A liquid coating spraying system according to claim 4, characterized in that: The indicator tube (14) is made of a transparent material, and scale lines are provided on the tube wall of the indicator tube (14).

10. A liquid coating spraying system according to claim 1, characterized in that: The specifications of the driving gear (3) are the same as those of the driven gear (4).

Images