Efficient airless spraying machine and spraying process

Abstract

The invention relates to the technical field of airless spraying machines, and discloses an efficient airless spraying machine and a spraying technology.The efficient airless spraying machine comprises a plunger pump, one end of the plunger pump is connected with a material suction pipe, the other end of the plunger pump is provided with a spraying pistol, and a backflow assembly and a filtering assembly are arranged between the plunger pump and the spraying pistol; the backflow assembly is connected with the material suction pipe. When the coating enters the three-way pipe along with pumping impact of the coating, membrane forming residues are scattered, the coating enters the three-way pipe along with the coating and is filtered by the filtering assembly, the filtered membrane forming residues cause blockage of the filtering assembly, the pressure intensity in the three-way pipe is increased at the moment, and when the pressure intensity reaches the overload intensity in a filtering mode, the overload backflow mechanism is triggered; the film forming residues are pumped to the direction of the flow dividing pipeline along with the coating, so that the film forming residues are cleaned, and the situation that the airless spraying machine cannot be used due to the fact that the film forming residues are always in the pipeline assembly during use is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of airless sprayers, in particular to a high-efficiency airless sprayer and a spraying process. Background Art

[0002] The "BULL" series are airless sprayers powered by compressed air. They use a novel zero-wear plunger pump to suck paint into the well and pressurize it before outputting it to a special super-hard nozzle for atomization and spraying. By selecting appropriate nozzles, it can be used in many fields ranging from small parts to large shipbuilding and construction. It can be used for most coatings to date and is more capable of adapting to harsh and severe environments (explosion-proof, high pressure, high altitude and very low temperature zones). It has a wide range of uses in places with compressed air sources. The "BULL" series products are available in a full range of sizes and specifications, each with its own characteristics, and you can choose according to your needs.

[0003] At present, when our company uses airless sprayers to spray valves, we find that most of the existing airless sprayers are equipped with a filter module at the position of the suction pipe to filter the pumped paint. However, in actual use, it is found that when used for the second time or later, the paint from the last use will remain between the plunger pump and the spray gun, and the paint will precipitate in the pipeline assembly, resulting in residual clear liquid and paint sediment in the pipeline assembly. In the early stage of use after the second time, the paint quality will be poor and the spraying effect will be poor, and even the nozzle of the spray gun will be blocked. Moreover, when the airless sprayer is used for too long, the internal pipeline assembly will have a film-forming phenomenon, and the residue of the paint will cause the film to form on the inner wall of the pipeline. With the pumping impact of the paint, the film will fall off. At this time, the filter module set at the position of the suction pipe loses its function, and impurities appear in the pipeline assembly inside the airless sprayer, which greatly affects the use of the sprayer. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a high-efficiency airless sprayer and a spraying process, which have the advantages of reflux cleaning of the part between the plunger pump and the spray gun, avoiding the influence of residue inside the pipeline on the next spraying effect caused by the use of the airless sprayer, etc., and solves the problem that the paint precipitates in the pipeline assembly, causing clear liquid and paint sediment to remain in the pipeline assembly, and in the early stage of use after the second time, there will be problems of poor paint quality and poor spraying effect, and even cause the nozzle of the spray gun to be blocked. When the airless sprayer is used for too long, the internal pipeline assembly will have a film forming phenomenon, and the residue of the paint will cause the film to form on the inner wall of the pipeline. With the pumping impact of the paint, the film falls off, and at this time, the filter module arranged at the position of the suction pipe loses its function, and impurities appear in the pipeline assembly inside the airless sprayer, which greatly affects the use of the sprayer.

[0005] (II) Technical solution In order to solve the above technical problems, the present invention provides the following technical solutions: a high-efficiency airless sprayer and a spraying process, comprising a plunger pump, one end of the plunger pump is connected to a suction pipe, the other end of the plunger pump is provided with a spray gun, a reflux component and a filter component are provided between the plunger pump and the spray gun, the reflux component is connected to the suction pipe; the reflux component comprises a main pipeline, a shunt pipeline, a tee pipe and an overload reflux mechanism; the main pipeline is connected to the bottom of the plunger pump, the shunt pipeline is connected to the main pipeline through a tee pipe, and the overload reflux mechanism The reflux mechanism is located between the shunt pipe and the main pipe; the filter assembly is located at the other end of the tee pipe and is connected to the spray pistol; an overload adjustment assembly is provided on one side of the overload reflux mechanism, and the overload adjustment assembly is used to adjust the overload reflux mechanism; the spray pistol includes a sealing tube, a liquid supply pipe, an elastic separation assembly and a spray wrench, the liquid supply pipe is connected to the filter assembly, the sealing tube is located at the other end of the liquid supply pipe, the elastic separation assembly is connected to the sealing tube, and the spray wrench is connected to the elastic separation assembly.

[0006] Preferably, a frame is provided at the bottom of the plunger pump, a walking wheel is provided at the bottom of one end of the frame, a handle is provided on the top of the frame, the suction pipe is located in the middle of the frame, a control panel is provided on one side of the plunger pump, the control panel is connected to the plunger pump electrical signal, and the upper side of the plunger pump is connected to the top of the suction pipe through a connecting pipe.

[0007] Preferably, the overload reflux mechanism includes an overload baffle, an overload spring, a spring stop rod and an overload channel, the overload channel is located in the middle of the diversion pipe, the overload baffle is located at the front end of the overload channel, the inner diameter of the front end of the overload channel is larger than the inner diameter of the rear end, the overload spring is located at the rear of the overload baffle, the spring stop rod is located on the inner side of the rear end of the overload channel, the other end of the overload spring is connected to the spring stop rod, and the overload adjustment assembly is located on one side of the spring stop rod.

[0008] Preferably, the overload adjustment assembly includes an adjustment shaft, an adjustment gear and an adjustment lever, the adjustment shaft is located at the bottom of the spring stop rod, an adjustment rack is provided in the middle of the spring stop rod, the adjustment gear is located in the middle of the adjustment shaft, the adjustment gear is meshed with the adjustment rack, the adjustment shaft is rotatably arranged with the inner wall of the overload channel, one end of the adjustment shaft passes through the overload channel and extends to the outside of the overload channel, and the outer end of the adjustment shaft is connected to the adjustment lever.

[0009] Preferably, the filter assembly includes a filter plate, a cleaning mechanism and a liquid outlet pipe, the liquid outlet pipe is located between the three-way pipe and the spray pistol, the filter plate is located at the connection between the liquid outlet pipe and the three-way pipe, the cleaning mechanism is located on the side of the filter plate close to the three-way pipe, and the cleaning mechanism is linked to the reflux assembly.

[0010] Preferably, the cleaning mechanism includes a cleaning rod, a rotating shaft and a torsion spring, the rotating shaft is rotatably arranged at the center of the filter plate, the middle part of the cleaning rod is fixedly connected to the rotating shaft, the cleaning rod is tightly arranged to the filter plate, the torsion spring is arranged on the other side of the filter plate, the rotating shaft extends to one end of the filter plate, and the torsion spring is sleeved on the outside of the rotating shaft, and the two ends of the torsion spring are respectively connected to the rotating shaft and the filter plate.

[0011] Preferably, the spray gun further comprises a spray tube, wherein the spray tube is located at one end of the sealing tube away from the liquid supply tube, and a nozzle is arranged at the other end of the spray tube, and a protective sleeve is provided on the nozzle.

[0012] Preferably, the elastic separation assembly includes a separation spring and a telescopic tube sleeve, the telescopic tube sleeve is arranged on the outside of the sealing tube, the separation spring is located outside the telescopic tube sleeve, the other end of the telescopic tube sleeve is connected to the liquid supply pipe, and the other end of the separation spring is connected to the inner wall of the spray pistol.

[0013] Preferably, a one-way sealing plug is provided at the tail of the spray pipe, the sealing pipe sleeve is provided on the spray pipe, the telescopic pipe sleeve is located inside the sealing pipe and a through-tube is provided, and the one-way sealing plug is provided opposite to the through-tube.

[0014] A spraying process uses the above-mentioned high-efficiency airless sprayer.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides a high-efficiency airless sprayer and spraying process, which has the following beneficial effects: 1. The airless sprayer based on the filtering structure performs backflow cleaning of the paint left after the last use between the plunger pump and the spray gun, and adjusts the overload strength of the overload reflux mechanism in the reflux component through the overload regulating component, so that the overload strength of the overload reflux mechanism is reduced (the overload strength in the reflux cleaning mode), and then the paint is pumped from the suction pipe to the spray gun through the plunger pump. During the pumping process, due to the reduction of the overload strength of the overload reflux mechanism, as the paint is pumped, the pressure at the three-way pipe increases, and the overload reflux mechanism is triggered by the pressure. The paint sediment and clear liquid left between the plunger pump and the spray gun are separated at this time, a part of the paint sediment is refluxed toward the suction pipe through the diversion pipe, and a part of the paint sediment mixed with the clear liquid passes through the filtering component and is discharged through the liquid supply pipe in the spray gun; the part between the plunger pump and the spray gun is refluxed to avoid the residue inside the pipe affecting the next spraying effect after the airless sprayer is used.

[0016] 2. The airless sprayer based on the filtering structure drives the elastic separation component through the spray wrench, so that the elastic separation component is connected with the liquid supply pipe in the sealing tube, and then the paint is sprayed by the spray gun; during use, the overload strength of the overload reflux mechanism in the reflux component is adjusted by the overload adjustment component, so that the overload strength of the overload reflux mechanism is increased (the overload strength in the filtering mode). Due to long-term use between the plunger pump and the spray gun, film residues are generated on the inner wall of the internal pipeline assembly. With the pumping impact of the paint, the film residues are dispersed and follow the paint into the three-way pipe, and are filtered by the filtering component. The film residues under filtration cause the filtering component to be blocked. At this time, the internal pressure of the three-way pipe increases until the pressure reaches the overload strength in the filtering mode. The overload reflux mechanism is triggered, so that the film residues are pumped along the paint to the direction of the diversion pipe, thereby completing the cleaning of the film residues, avoiding the film residues in the pipeline assembly during use, making the airless sprayer unusable.

[0017] 3. When the overload baffle in the overload reflux mechanism of the airless sprayer based on the filtering structure is subjected to a certain pressure, the overload spring is blocked by the spring baffle rod, so that the overload spring is compressed, and then the overload baffle moves toward the tail end of the overload channel, so that the paint inside the three-way pipe is pumped into the diversion pipe, and the position of the spring baffle rod can be adjusted by the overload adjustment component to match the overload strength of the overload reflux mechanism with the use in different periods.

[0018] 4. The airless sprayer based on the filtering structure drives the adjusting shaft and the adjusting gear to rotate through the adjusting lever in the overload adjusting assembly, and the adjusting gear drives the adjusting rack to move, and then the adjusting rack drives the spring stop rod to move, thereby completing the adjustment of the overload strength of the overload reflux mechanism.

[0019] 5. The airless sprayer based on the filtering structure filters the paint passing through the three-way pipe through the filter plate in the filtering assembly, so that the spray gun sprays clean paint, while also preventing the spray gun from being blocked. After filtering the paint for a period of time, when there are too many film residues on the filter plate, the internal pressure of the three-way pipe is too high, causing the overload reflux mechanism to be triggered, and the overload reflux mechanism drives the cleaning mechanism to clean the film residues on the surface of the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is one of the overall three-dimensional structural schematic diagrams of the present invention; Figure 2 This is the second schematic diagram of the overall three-dimensional structure of the present invention; Figure 3 For the present invention Figure 2 A local enlarged structural schematic diagram; Figure 4 It is one of the structural schematic diagrams of the plunger pump, spray gun and reflux assembly of the present invention; Figure 5 This is the second schematic diagram of the structure of the plunger pump, spray gun and reflux assembly of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the local enlarged structure at B; Figure 7 This is one of the schematic diagrams of the internal cross-sectional structure of the reflux assembly of the present invention; Figure 8 The second schematic diagram of the internal cross-sectional structure of the reflux assembly of the present invention; Fig. 9 It is a partial structural schematic diagram of the spray gun of the present invention; Fig.10 The figure is a schematic diagram of the internal cross-sectional structure of the spray gun of the present invention.

[0021] In the figure: 1, plunger pump; 11, connecting pipe; 2, suction pipe; 3, spray gun; 31, sealing pipe; 32, liquid supply pipe; 33, elastic separation component; 331, separation spring; 332, telescopic pipe sleeve; 333, one-way sealing plug; 34, spray wrench; 35, spray pipe; 351, pipe threading; 36, nozzle; 37, protective cover; 4, reflux component; 41, main pipeline; 42, diversion pipeline; 43, three-way pipe; 44, overload reflux mechanism; 44 1. Overload baffle; 442. Overload spring; 443. Spring baffle rod; 444. Overload channel; 445. Adjustment rack; 5. Filter assembly; 51. Filter plate; 52. Cleaning mechanism; 521. Cleaning rod; 522. Rotating shaft; 523. Torsion spring; 53. Liquid outlet pipe; 54. Connecting rod; 6. Overload adjustment assembly; 61. Adjustment shaft; 62. Adjustment gear; 63. Adjustment lever; 7. Frame; 71. Travel wheel; 72. Handle; 8. Control panel. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 - Fig.10 A high-efficiency airless sprayer and a spraying process, comprising a plunger pump 1, one end of the plunger pump 1 is connected to a suction pipe 2, the other end of the plunger pump 1 is provided with a spray gun 3, a reflux component 4 and a filter component 5 are provided between the plunger pump 1 and the spray gun 3, the reflux component 4 is connected to the suction pipe 2; the reflux component 4 comprises a main pipeline 41, a shunt pipeline 42, a tee pipe 43 and an overload reflux mechanism 44; the main pipeline 41 is connected to the bottom of the plunger pump 1, the shunt pipeline 42 is connected to the main pipeline 41 through a tee pipe 43, and the overload reflux mechanism 44 is located in the shunt pipeline 42 and the main pipeline 41; the filter assembly 5 is located at the other end of the three-way pipe 43 and is connected to the spray pistol 3; an overload adjustment assembly 6 is provided on one side of the overload reflux mechanism 44, and the overload adjustment assembly 6 is used to adjust the overload reflux mechanism 44; the spray pistol 3 includes a sealing tube 31, a liquid supply pipe 32, an elastic separation assembly 33 and a spray wrench 34, the liquid supply pipe 32 is connected to the filter assembly 5, the sealing tube 31 is located at the other end of the liquid supply pipe 32, the elastic separation assembly 33 is connected to the sealing tube 31, and the spray wrench 34 is connected to the elastic separation assembly 33.

[0024] In actual use, a filter screen is provided at the bottom of the suction pipe 2 to filter the paint sucked by the pump, and the tail end of the diversion pipe 42 in the reflux component 4 extends to the bottom of the suction pipe 2; When in use, place the valve to be sprayed in the spraying area, firstly, clean up the paint left after the last use between the plunger pump 1 and the spray gun 3, adjust the overload strength of the overload reflux mechanism 44 in the reflux component 4 through the overload adjustment component 6, so that the overload strength of the overload reflux mechanism 44 is reduced (the overload strength in the reflux cleaning mode), and then pump the paint from the suction pipe 2 to the spray gun 3 through the plunger pump 1. During the pumping process, due to the reduction of the overload strength of the overload reflux mechanism 44, as the paint is pumped , so that the pressure at the three-way pipe 43 increases, and the overload reflux mechanism 44 is triggered by the pressure to trigger the overload effect. At this time, the paint sediment and clear liquid left between the plunger pump 1 and the spray gun 3 are separated, and a part of the paint sediment flows back to the suction pipe 2 through the shunt pipe 42, and a part of the paint sediment mixed with the clear liquid passes through the filter component 5 and is discharged through the liquid supply pipe 32 in the spray gun 3; the part between the plunger pump 1 and the spray gun 3 is refluxed and cleaned to avoid the residue inside the pipe after the airless sprayer is used. Affect the next spraying effect; wherein the spray wrench 34 drives the elastic separation component 33, so that the elastic separation component 33 is connected with the liquid supply pipe 32 in the sealing tube 31, and then the paint is sprayed by the spray gun 3; during use, the overload strength of the overload reflux mechanism 44 in the reflux component 4 is adjusted by the overload adjustment component 6, so that the overload strength of the overload reflux mechanism 44 is increased (the overload strength in the filtering mode), and the inner wall of the internal pipeline assembly between the plunger pump 1 and the spray gun 3 is generated due to long-term use. The film residues are dispersed with the pumping impact of the paint, and follow the paint into the three-way pipe 43, and are filtered by the filter assembly 5. The filtered film residues cause the filter assembly 5 to be blocked. At this time, the internal pressure of the three-way pipe 43 increases until the pressure reaches the overload strength under the filtering mode. The overload reflux mechanism 44 is triggered, so that the film residues are pumped toward the diversion pipe 42 along with the paint, thereby completing the cleaning of the film residues, avoiding the film residues being in the pipe assembly during use, making the airless sprayer unusable.

[0025] Furthermore, a frame 7 is provided at the bottom of the plunger pump 1, a walking wheel 71 is provided at the bottom of one end of the frame 7, a handle 72 is provided on the top of the frame 7, the suction pipe 2 is located in the middle of the frame 7, a control panel 8 is provided on one side of the plunger pump 1, the control panel 8 is connected to the plunger pump 1 by electrical signals, and the upper side of the plunger pump 1 is connected to the top of the suction pipe 2 through a connecting pipe 11; the weapon sprayer is intelligently controlled through the control panel 8.

[0026] Furthermore, the overload reflux mechanism 44 includes an overload baffle 441, an overload spring 442, a spring stop rod 443 and an overload channel 444, wherein the overload channel 444 is located in the middle of the shunt pipe 42, the overload baffle 441 is located at the front end of the overload channel 444, the inner diameter of the front end of the overload channel 444 is greater than the inner diameter of the rear end, the overload spring 442 is located at the rear end of the overload baffle 441, the spring stop rod 443 is located on the inner side of the rear end of the overload channel 444, and the other end of the overload spring 442 is connected to the spring stop rod 443. 3, the overload regulating component 6 is located on one side of the spring stop rod 443; when the overload baffle 441 in the overload reflux mechanism 44 is subjected to a certain pressure, the overload spring 442 is blocked by the spring stop rod 443, so that the overload spring 442 is compressed, and then the overload baffle 441 moves toward the tail end of the overload channel 444, so that the paint inside the three-way pipe 43 is pumped into the diversion pipe 42, wherein the position of the spring stop rod 443 can be adjusted by the overload regulating component 6, so that the overload strength of the overload reflux mechanism 44 matches the use in different periods.

[0027] Furthermore, the overload adjustment component 6 includes an adjustment shaft 61, an adjustment gear 62 and an adjustment lever 63, the adjustment shaft 61 is located at the bottom of the spring stop rod 443, an adjustment rack 445 is arranged in the middle of the spring stop rod 443, the adjustment gear 62 is located in the middle of the adjustment shaft 61, the adjustment gear 62 is meshed with the adjustment rack 445, the adjustment shaft 61 is rotatably arranged with the inner wall of the overload channel 444, one end of the adjustment shaft 61 passes through the overload channel 444 and extends to the outside of the overload channel 444, and one end of the outer side of the adjustment shaft 61 is connected to the adjustment lever 63; through the adjustment lever 63 in the overload adjustment component 6, the adjustment shaft 61 and the adjustment gear 62 are driven to rotate, the adjustment gear 62 drives the adjustment rack 445 to move, and then the adjustment rack 445 drives the spring stop rod 443 to move, thereby completing the adjustment of the overload strength of the overload reflux mechanism 44.

[0028] Furthermore, the filter assembly 5 includes a filter plate 51, a cleaning mechanism 52 and a liquid outlet pipe 53, wherein the liquid outlet pipe 53 is located between the three-way pipe 43 and the spray gun 3, the filter plate 51 is located at the connection between the liquid outlet pipe 53 and the three-way pipe 43, the cleaning mechanism 52 is located on a side of the filter plate 51 close to the three-way pipe 43, and the cleaning mechanism 52 is arranged in linkage with the reflux assembly 4; the paint passing through the three-way pipe 43 is filtered by the filter plate 51 in the filter assembly 5, so that the spray gun 3 sprays out clean paint, while also preventing the spray gun 3 from being blocked; after filtering the paint for a period of time, when there are too many film residues on the filter plate 51, the internal pressure of the three-way pipe 43 is too large, so that the overload reflux mechanism 44 is triggered, and the overload reflux mechanism 44 drives the cleaning mechanism 52 to clean the film residues on the surface of the filter plate 51.

[0029] Furthermore, the cleaning mechanism 52 includes a cleaning rod 521, a rotating shaft 522 and a torsion spring 523, wherein the rotating shaft 522 is rotatably arranged at the center of the filter plate 51, the middle of the cleaning rod 521 is fixedly connected to the rotating shaft 522, the cleaning rod 521 is closely arranged to the filter plate 51, the torsion spring 523 is arranged on the other side of the filter plate 51, the rotating shaft 522 extends to one end of the filter plate 51, and the torsion spring 523 is sleeved on the outside of the rotating shaft 522. The two ends of the torsion spring 523 are respectively connected to the rotating shaft 522 and the filter plate 51; the connecting rod 54 in the cleaning mechanism 52 follows the overload reflux mechanism 44 to move, thereby driving the cleaning rod 521 to rotate with the rotating shaft 522 as the axis. When the rotating shaft 522 rotates, it drives the torsion spring 523 to store force. When the internal pressure of the three-way pipe 43 decreases, the overload reflux mechanism 44 is restored, and the torsion spring 523 in the force storage state drives the rotating shaft 522 to reverse, thereby driving the cleaning rod 521 to reverse and return to the initial position.

[0030] Furthermore, the spray gun 3 also includes a spray tube 35, which is located at one end of the sealing tube 31 away from the liquid supply tube 32, and a nozzle 36 is provided at the other end of the spray tube 35, and a protective cover 37 is provided on the nozzle 36; the paint pumped over is sprayed out from the nozzle 36 through the spray tube 35 in the spray gun 3, and passes through the protective cover 37 during spraying, thereby limiting the range of paint spraying and avoiding too large a range of paint spraying.

[0031] Furthermore, the elastic separation component 33 includes a separation spring 331 and a telescopic tube sleeve 332, the telescopic tube sleeve 332 is sleeved on the outside of the sealing tube 31, the separation spring 331 is located outside the telescopic tube sleeve 332, the other end of the telescopic tube sleeve 332 is connected to the liquid supply pipe 32, and the other end of the separation spring 331 is connected to the inner wall of the spray pistol 3; the separation spring 331 in the elastic separation component 33 is not driven by the spray wrench 34, so that the telescopic tube sleeve 332 approaches the liquid supply pipe 32 and moves away from the nozzle 36.

[0032] Furthermore, a penetration tube 351 is provided at the tail end of the spray tube 35, the sealing tube 31 is sleeved on the spray tube 35, and a one-way sealing plug 333 is provided inside the telescopic tube sleeve 332, and the one-way sealing plug 333 is arranged opposite to the penetration tube 351; through the penetration tube 351 at the tail end of the spray tube 35, when the spray wrench 34 drives the telescopic tube sleeve 332 to move toward the nozzle 36, the penetration tube 351 pushes the one-way sealing plug 333 in the telescopic tube sleeve 332 to move, thereby connecting the telescopic tube sleeve 332 with the spray tube 35. After withdrawing the spray wrench 34, under the action of the separation spring 331, the telescopic tube sleeve 332 drives the one-way sealing plug 333 away from the penetration tube 351, thereby separating the telescopic tube sleeve 332 from the spray tube 35, thereby preventing the paint from overflowing from the spray gun 3.

[0033] A spraying process uses a high-efficiency airless sprayer and a spraying process.

[0034] Working principle: when in use, firstly, the paint left after the last use between the plunger pump 1 and the spray gun 3 is refluxed and cleaned, and the overload strength of the overload reflux mechanism 44 in the reflux component 4 is adjusted through the overload adjustment component 6, so that the overload strength of the overload reflux mechanism 44 is reduced (the overload strength in the reflux cleaning mode), wherein the adjustment lever 63 in the overload adjustment component 6 drives the adjustment shaft 61 and the adjustment gear 62 to rotate, and the adjustment gear 62 drives the adjustment rack 445 to move, and then the adjustment rack 445 drives the spring blocking rod 443 to move, so as to complete the adjustment of the overload strength of the overload reflux mechanism 44; When the overload baffle plate 441 in the overload reflux mechanism 44 is subjected to a certain pressure, the overload spring 442 is blocked by the spring baffle rod 443, so that the overload spring 442 is compressed, and then the overload baffle plate 441 moves toward the tail end of the overload channel 444, so that the paint inside the three-way pipe 43 is pumped into the diversion pipe 42, wherein the position of the spring baffle rod 443 can be adjusted by the overload adjustment component 6, so that the overload strength of the overload reflux mechanism 44 matches the use in different periods; The paint is pumped from the suction pipe 2 to the spray gun 3 by the plunger pump 1. During the pumping process, the overload strength of the overload reflux mechanism 44 decreases. As the paint is pumped, the pressure at the three-way pipe 43 increases. The overload reflux mechanism 44 is triggered by the pressure to trigger the overload effect. At this time, the paint sediment and clear liquid left between the plunger pump 1 and the spray gun 3 are separated, and a part of the paint sediment flows back to the suction pipe 2 through the shunt pipe 42, and a part of the paint sediment mixed with the clear liquid passes through the filter assembly 5 and is discharged through the liquid supply pipe 32 in the spray gun 3; the part between the plunger pump 1 and the spray gun 3 is refluxed and cleaned to avoid the residue inside the pipe affecting the next spraying effect after the airless sprayer is used; In the above process, the paint passing through the three-way pipe 43 is filtered by the filter plate 51 in the filter assembly 5, so that the spray gun 3 can spray clean paint, and at the same time, the spray gun 3 can be prevented from being blocked. After filtering the paint for a period of time, when there are too many film residues on the filter plate 51, the internal pressure of the three-way pipe 43 is too large, so that the overload reflux mechanism 44 is triggered, and the overload reflux mechanism 44 drives the cleaning mechanism 52 to clean the film residues on the surface of the filter plate 51; the connecting rod 54 in the cleaning mechanism 52 moves with the overload reflux mechanism 44, and then drives the cleaning rod 521 to rotate with the rotating shaft 522 as the axis, and when the rotating shaft 522 rotates, it drives the torsion spring 523 to store force. When the internal pressure of the three-way pipe 43 decreases, the overload reflux mechanism 44 is restored, and the torsion spring 523 in the stored force state drives the rotating shaft 522 to reverse, and then drives the cleaning rod 521 to reverse and return to the initial position; The spray wrench 34 drives the elastic separation component 33 so that the elastic separation component 33 is connected with the liquid supply pipe 32 in the sealing pipe 31, and then the paint is sprayed by the spray gun 3; through the through pipe 351 at the tail of the spray pipe 35, when the spray wrench 34 drives the telescopic pipe sleeve 332 to move toward the nozzle 36, the through pipe 351 pushes the one-way sealing plug 333 in the telescopic pipe sleeve 332 to move, so that the telescopic pipe sleeve 332 is connected with the spray pipe 35. After the spray wrench 34 is withdrawn, under the action of the separation spring 331, the telescopic pipe sleeve 332 drives the one-way sealing plug 333 away from the through pipe 351, so that the telescopic pipe sleeve 332 is separated from the spray pipe 35, so as to prevent the paint from overflowing from the spray gun 3; During use, the overload strength of the overload reflux mechanism 44 in the reflux component 4 is adjusted by the overload adjustment component 6, so that the overload strength of the overload reflux mechanism 44 increases (the overload strength in the filtering mode). Due to long-term use, film residues are generated on the inner wall of the internal pipe assembly between the plunger pump 1 and the spray gun 3. With the pumping impact of the paint, the film residues are dispersed and follow the paint into the three-way pipe 43, and are filtered by the filter component 5. The film residues under filtration cause the filter component 5 to be blocked. At this time, the internal pressure of the three-way pipe 43 increases until the pressure reaches the overload strength in the filtering mode. The overload reflux mechanism 44 is triggered, so that the film residues are pumped along the paint to the direction of the diversion pipe 42, thereby completing the cleaning of the film residues, avoiding the film residues in the pipe assembly during use, making the airless sprayer unusable.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient airless sprayer, comprising a plunger pump, one end of which is connected to a suction pipe, and the other end of which is provided with a spray gun, characterized in that: A reflux component and a filter component are provided between the plunger pump and the spray gun, and the reflux component is connected to the suction pipe; the reflux component includes a main pipeline, a shunt pipeline, a tee pipe and an overload reflux mechanism; the main pipeline is connected to the bottom of the plunger pump, the shunt pipeline is connected to the main pipeline through a tee pipe, and the overload reflux mechanism is located between the shunt pipeline and the main pipeline; the filter component is located at the other end of the tee pipe and is connected to the spray gun; An overload regulating component is provided on one side of the overload reflux mechanism, and the overload regulating component is used to regulate the overload reflux mechanism; The spray pistol includes a sealing tube, a liquid supply tube, an elastic separation component and a spray wrench. The liquid supply tube is connected to the filter component. The sealing tube is located at the other end of the liquid supply tube. The elastic separation component is connected to the sealing tube. The spray wrench is connected to the elastic separation component.

2. A high-efficiency airless sprayer according to claim 1, characterized in that: A frame is provided at the bottom of the plunger pump, a walking wheel is provided at the bottom of one end of the frame, a handle is provided on the top of the frame, the suction pipe is located in the middle of the frame, a control panel is provided on one side of the plunger pump, the control panel is connected to the plunger pump electrical signal, and the upper side of the plunger pump is connected to the top of the suction pipe through a connecting pipe.

3. A high-efficiency airless sprayer according to claim 1, characterized in that: The overload reflux mechanism includes an overload baffle, an overload spring, a spring baffle rod and an overload channel, wherein the overload channel is located in the middle of the shunt pipe, the overload baffle is located at the front end of the overload channel, the inner diameter of the front end of the overload channel is larger than the inner diameter of the rear end, the overload spring is located at the rear end of the overload baffle, the spring baffle rod is located on the inner side of the rear end of the overload channel, the other end of the overload spring is connected to the spring baffle rod, and the overload adjustment assembly is located on one side of the spring baffle rod.

4. A high-efficiency airless sprayer according to claim 3, characterized in that: The overload adjustment assembly includes an adjustment shaft, an adjustment gear and an adjustment lever, the adjustment shaft is located at the bottom of the spring block rod, an adjustment rack is arranged in the middle of the spring block rod, the adjustment gear is located in the middle of the adjustment shaft, the adjustment gear is meshed with the adjustment rack, the adjustment shaft is rotatably arranged with the inner wall of the overload channel, one end of the adjustment shaft passes through the overload channel and extends to the outside of the overload channel, and one end outside the adjustment shaft is connected to the adjustment lever.

5. The high-efficiency airless sprayer according to claim 1, characterized in that: The filter assembly includes a filter plate, a cleaning mechanism and a liquid outlet pipe, the liquid outlet pipe is located between the three-way pipe and the spray gun, the filter plate is located at the connection between the liquid outlet pipe and the three-way pipe, the cleaning mechanism is located on the side of the filter plate close to the three-way pipe, and the cleaning mechanism is linked to the reflux assembly.

6. A high-efficiency airless sprayer according to claim 5, characterized in that: The cleaning mechanism includes a cleaning rod, a rotating shaft and a torsion spring. The rotating shaft is rotatably arranged at the center of the filter plate. The middle part of the cleaning rod is fixedly connected to the rotating shaft. The cleaning rod is tightly arranged to the filter plate. The torsion spring is arranged on the other side of the filter plate. The rotating shaft extends to one end of the filter plate, and the torsion spring is sleeved on the outside of the rotating shaft. The two ends of the torsion spring are respectively connected to the rotating shaft and the filter plate.

7. The high-efficiency airless sprayer according to claim 1, characterized in that: The spray gun also includes a spray tube, which is located at one end of the sealing tube away from the liquid supply tube. The other end of the spray tube is provided with a nozzle, and the nozzle is covered with a protective sleeve.

8. A high-efficiency airless sprayer according to claim 7, characterized in that: The elastic separation component includes a separation spring and a telescopic tube sleeve, the telescopic tube sleeve is located inside the sealing tube, the separation spring is located outside the telescopic tube sleeve, the other end of the telescopic tube sleeve is connected to the liquid supply pipe, and the other end of the separation spring is connected to the inner wall of the spray gun.

9. A high-efficiency airless sprayer according to claim 8, characterized in that: A one-way sealing plug is arranged at the tail of the spray pipe, the sealing pipe sleeve is arranged on the spray pipe, the telescopic pipe sleeve is arranged inside the sealing pipe and a through pipe is arranged, and the one-way sealing plug is arranged opposite to the through pipe.

10. A spraying process, characterized in that: A high-efficiency airless sprayer as described in any one of claims 1 to 9 is used.

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