CN113198629B - Powder electrostatic spray gun and assembly thereof - Google Patents

Abstract

The invention discloses a powder electrostatic spray gun, which comprises a gun shell, a spray head assembly and a high-voltage electrostatic module arranged in the gun shell, wherein an insulating cover is arranged in the gun shell, the whole or part of the output end of the high-voltage electrostatic module is positioned in the insulating cover, the insulating cover part extends out of the gun shell and is connected with the spray head assembly, and a sealing structure is arranged between the insulating cover and the gun shell. The insulating cover is arranged to further protect the high-voltage electrostatic module, and double insulating protection of the insulating cover and the gun shell is achieved. The problem that high-voltage static electricity generates corona discharge outside a gun shell through air in the using process of the spray gun is solved. But also can effectively prevent powder particles such as powder coating, dust and the like in the spraying environment from entering the gun shell, thereby causing electrical faults caused by poor insulation of electrical elements in the gun shell.

Description

Powder electrostatic spray gun and assembly thereof

Technical Field

The invention relates to the field of electrostatic powder spray guns, in particular to an electrostatic powder spray gun and a component thereof.

Background

The electrostatic powder spray gun is mainly a spraying tool for coating the surface, and is mainly applied to coating the metal surface. The working principle of the electrostatic powder spray gun is as follows: under the blowing and jetting of auxiliary air flow, the powder coating particles are sprayed out from the nozzle of the gun head in an atomized state, an electrode needle capable of releasing high-voltage static electricity is arranged at the center of the nozzle, the electrode needle can radiate an electrostatic field, when the atomized powder coating particles pass through the high-voltage electrostatic field, the powder can be charged to carry electrostatic charges, and finally the powder coating particles are adsorbed on the surface of a sprayed workpiece with opposite electrostatic charges.

Electrostatic powder spray guns have high insulation performance requirements, and if electrostatic leakage occurs, the amount of static electricity carried by the sprayed powder is insufficient. In the prior art, common electrostatic protection is as described in the invention patent of china, "a discharge protection structure applied to a high-voltage electrostatic spray gun", application (patent) No.: CN201922425500.0, including the spray gun main part, the spray gun main part includes main part backshell, main part front shell and the rifle head that connects gradually, be equipped with the powder passageway that runs through main part backshell, main part front shell and rifle head in proper order in the spray gun main part, be equipped with high-voltage static generator in the spray gun main part, be equipped with the conductor wire that one end is connected with high-voltage static generator electricity in the main part front shell, the other end of conductor wire is connected with the rifle head electricity, the periphery of conductor wire has a layer of protective coating that is used for preventing high-voltage static breakdown and leakage, sets up the protective coating in the periphery of conductor wire, makes the high-voltage static that high-voltage static generator produced in the process of conducting to the discharge needle, can prevent puncturing through the protective coating, prevent leaking the protection, improve the security of high-voltage static spray gun greatly.

However, the existing electrostatic powder spray gun is protected by the means, and the electrostatic powder spray gun still has defects in the using process. For example, the gun case has a problem that high-voltage discharge occurs because the air inside and outside the gun case communicates with each other because the sealing performance of the gun case is poor. Insufficient static can result in the sprayed powder failing to be sufficiently electrostatically charged, and the powder failing to adhere to the workpiece, instead, falling or passing over the workpiece being painted. Not only reduces the working efficiency of spraying, but also causes uneven powder distribution on the surface of the sprayed workpiece, and can not achieve ideal spraying effect.

The Chinese patent discloses a novel electrostatic spray gun, and the application (patent) number is as follows: CN201610518057.X, which comprises a nozzle installed at the top of a low-pressure high-atomization device, a protective cover installed at the top of the housing of the low-pressure high-atomization device, a static generator connected with the low-pressure high-atomization device, an air tube connected with the tail of a handle, and a high-voltage wire connected with the handle. The dust cover is installed on low pressure high atomizing device shell top, and its material is insulating, transparent plastic, and it is detachable, telescopic. The user can ensure that static can not leak outward through the flexible dust cover of assembly insulation when using, and is safer than static spray gun in the past, improves work efficiency greatly.

The above patent further ensures that static electricity does not leak out by adding a dust cover, but the proposal has the following problems: the dust cover is arranged at the top end of the shell of the low-pressure high-atomization device and is detachable and telescopic, and one dust cover is arranged on the outer surface, so that the dust cover is easy to interfere and inconvenient to use; and a detachable connection mode is adopted between the dust cover and the low-pressure high-atomization device, the connection tightness cannot be ensured, and the possibility of leakage still exists when the electrostatic spray gun is used.

Disclosure of Invention

The invention aims to solve the technical problem of providing a powder electrostatic spray gun and a component thereof, wherein an insulating cover is arranged to further protect a high-voltage electrostatic module, so that double insulation protection of the insulating cover and a gun shell is obtained; the problem that high-voltage static electricity generates corona discharge outside a gun shell through air in the using process of the spray gun is solved; but also can effectively prevent powder particles such as powder coating, dust and the like in the spraying environment from entering the gun shell, thereby causing electrical faults caused by poor insulation of electrical elements in the gun shell.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a powder static spray gun, includes rifle casing, shower nozzle subassembly and sets up the high-voltage static module in the rifle casing, the rifle casing in be provided with the insulating boot, the output of high-voltage static module whole or part be located the insulating boot, insulating boot part stretch out the rifle casing and be connected with the shower nozzle subassembly, insulating boot and rifle casing between be provided with seal structure.

Compared with the prior art, the high-voltage electrostatic protection gun has the advantages that the insulating cover is additionally arranged in the gun shell, the high-voltage electrostatic module is further protected by the insulating cover, the ambient air at the output end of the high-voltage electrostatic module is isolated from the air at the periphery of the insulating cover by the insulating cover, and the phenomenon of high-voltage discharge caused by the fact that the air at the output end of the high-voltage electrostatic module is communicated with the air outside the insulating cover when the high-voltage electrostatic module works can be avoided. The invention is provided with an insulating cover, part of which extends out of a gun shell and is connected with a spray head assembly, and a sealing structure is arranged between the insulating cover and the gun shell. The high-voltage electrostatic module located within the insulating housing can be directly connected to the showerhead assembly without being directly exposed to the environment within the gun housing.

Secondly, the insulating module of the invention is mounted in the gun housing, which in turn can play a role in separating its internal ambient air from the external ambient air. Then the high-voltage static electricity emitted by the output end of the high-voltage static electricity module in the insulating cover obtains double insulating protection of the insulating cover and the gun shell. The problem that high-voltage static electricity generates corona discharge outside a gun shell through air in the using process of the spray gun is solved. But also can effectively prevent powder particles such as powder coating, dust and the like in the spraying environment from entering the gun shell, thereby causing electrical faults caused by poor insulation of electrical elements in the gun shell.

The high-voltage electrostatic module comprises an input end connected with a power supply and an output end for outputting high-voltage electrostatic, and the output end is used for being connected with other components in the spray gun.

Further preferred embodiments of the invention: the gun shell comprises a first gun shell and a second gun shell, the first gun shell and the second gun shell are connected to form the gun shell, a sealing structure is arranged between the first gun shell and the second gun shell, and the connecting surface of the first gun shell and the second gun shell is a vertical surface parallel to the axial direction of the gun shell.

The gun shell comprises a gun barrel part and a handle part, the gun barrel part is of a circular tubular structure, and the axial direction of the gun shell is the axial direction of the gun barrel part.

According to the invention, the gun shell is enabled to be a relatively sealed environment through the connection of the first gun shell and the second gun shell, and firstly, the communication between the air in the gun shell and the air outside the gun shell can be isolated, so that the corona discharge phenomenon caused by high-voltage static electricity can be avoided. And secondly, powder particles such as powder coating, dust and the like in the spraying environment can be prevented from entering the gun shell, so that electrical faults caused by poor insulation of electrical elements in the gun shell can be prevented.

Traditional rifle casing all is the rifle casing design theory of open type behind the whole sleeve, all adopt injection moulding process production by the plastics that have insulating properties, because receive the restriction of mould drawing of patterns shaping, the appearance of rifle casing and inner structure's design have all received certain restriction, make the installation of inside spare part, work such as wiring all goes on in rifle casing front and back opening hole, make the operation of installation and maintenance all very inconvenient, influence work efficiency, and the rifle casing of cover tube shape is being done sealed the processing and is being more difficult. The existing powder electrostatic spray gun is difficult to completely seal the inside and the outside of the gun shell so as to isolate the air inside and outside the gun shell. According to the invention, the gun shell is separated by the vertical surface parallel to the axial direction of the gun shell, the inner part of the gun shell can be completely exposed, parts can be conveniently installed in the gun shell, corresponding sealing structures can be arranged on the first gun shell and the second gun shell, and the first gun shell and the second gun shell are good in sealing property after being connected.

Further, first rifle shell on be provided with the sand grip along its connection face, the second rifle shell on be provided with the spacing groove along its connection face, first rifle shell be connected with the second rifle shell, the sand grip is embedded into the spacing inslot, realizes that first rifle shell and second rifle shell are stable lock. Furthermore, the limiting groove is internally provided with a sealing strip, and the raised strip is connected with the limiting groove through the sealing strip. The connection of the first and second casings of the present invention thus far achieves good sealing.

Further, the rifle casing seted up first opening and supplied the insulating boot to wear out, first opening inboard be provided with first draw-in groove, the insulating boot be provided with the baffle, the baffle install at first draw-in groove, be provided with seal structure between baffle and the first draw-in groove.

The direct sealing connection structure between the first opening of the gun housing and the insulating cover has certain difficulty and low connection reliability. According to the gun shell, the first clamping groove is formed in the first opening, the baffle is arranged on the insulating cover, and the baffle and the first clamping groove are connected in a matched mode, so that the insulating cover and the gun shell are connected with each other, the sealing performance is good, and the reliability of connection of the insulating cover and the gun shell is improved.

Specifically, the outer peripheral surface of the baffle is provided with a sealing ring, and the baffle is connected with the first clamping groove through the sealing ring.

Specifically, first draw-in groove be located the inner wall of rifle casing, install the baffle laminating in first draw-in groove at first open-ended inboard. The baffle plate is structurally arranged, so that the mounting stability of the insulating cover in the gun shell is effectively improved, and the sealing reliability of the gun shell is improved.

Specifically, the gun housing includes a barrel portion and a handle portion, and the first opening is located in the barrel portion.

Furthermore, the insulating cover part is of a circular tubular structure with external threads arranged on the surface, the spray head component is provided with internal threads, and the spray head component is in threaded connection with the insulating cover.

The spray head assembly is connected with the insulating cover in a threaded manner, so that the spray head assembly and the insulating cover are connected stably and have good sealing performance. And through the shower nozzle subassembly that lies in the rifle casing outside with the locking of being connected of insulating boot, also can be further fixed insulating boot and rifle casing, fixed shower nozzle subassembly and rifle casing's position.

Furthermore, elastic parts such as sealing rings and the like can be additionally arranged on the connecting surface of the two, so that good sealing performance can be achieved.

Furthermore, the gun shell is provided with a second opening for the inner powder tube to extend out, a multi-pass plate is arranged outside the inner powder tube, the inner powder tube is connected with the multi-pass plate, and the multi-pass plate is connected with the second opening.

The second opening is positioned on the lower end surface of the handle part.

Specifically, the multi-pass plate comprises a base plate and a plurality of mounting rings arranged on the base plate, wherein the mounting rings are communicated with the end faces of two sides of the base plate. The inner side of the second opening is provided with a second clamping groove, the multi-pass plate is embedded into the second clamping groove and connected with the second clamping groove, and a sealing structure is arranged between the multi-pass plate and the second clamping groove.

Specifically, the outer peripheral surface of the multi-way plate is provided with a sealing ring, and the multi-way plate is connected with the second clamping groove through the sealing ring.

Furthermore, the inner powder tube is connected with the multi-pass plate. Specifically, the inner powder tube penetrates through one of the mounting rings and the second opening, the inner powder tube is connected with the mounting ring, and a sealing structure is arranged between the inner powder tube and the mounting ring.

Furthermore, the upper end of the inner powder tube is connected with the insulating cover. Specifically, the insulating cover is provided with a powder passage, and the powder passage is communicated with the head of the insulating cover. The upper end of the inner powder tube is connected to the powder channel. Powder coating is guided into the spray gun by the inner powder pipe and then conveyed to the spray head assembly through the powder passage.

Further, the gun shell is provided with a third opening, a power switch is installed at the third opening, and the power switch can be turned on by the movement of the trigger.

Specifically, the power switch is provided with a sealing ring, the wall surface of the third opening is provided with a recess for embedding the sealing ring, and the power switch is connected with the wall surface of the third opening through the sealing ring.

Specifically, the third opening is located on the side surface of the handle portion. Further, the rifle casing surface be equipped with the recess, the recess is located the side of handle portion, the trigger install in recess department, and the trigger dustcoat is outside switch. The trigger is connected with the wall surface of the groove through the shaft piece, the trigger can rotate around the shaft piece, and the third opening is formed in one side wall surface of the groove.

The gun shell is provided with a first opening, a second opening and a third opening which are respectively used for introducing powder coating, an inner powder tube and a power switch. Therefore, the sealing is realized on the first opening, the second opening and the third opening. Air conduction between the environment inside the gun housing and the outside environment is isolated.

Furthermore, the spray head assembly comprises a spray pipe, a locking threaded sleeve and an electrode pipe, the insulating cover is provided with a powder passage, the spray pipe is communicated with the powder passage, and the electrode pipe is positioned on the axis of the spray pipe.

The invention further discloses a specific structure of the spray head assembly. The spray head assembly is connected with the gun shell, specifically the insulating cover, through the locking threaded sleeve. The spray pipe is arranged for passing powder coating, and the electrode pipe is arranged for leading in high-voltage static electricity.

The electrode tube is positioned on the axis of the spray tube, namely the electrode tube is positioned at the central position of the spray tube, so that the atomized powder sprayed out of the spray tube is uniformly charged with static electricity, and a good spraying effect is achieved.

Furthermore, a plurality of partition plates are arranged on the inner wall surface of the spray pipe, the elastic force of the partition plates acts on the periphery of the electrode pipe, and the electrode pipe is limited at the center of the spray pipe through the partition plates.

The electrode tube is limited by arranging the partition valve, so that the electrode tube is ensured to be positioned at the center of the spray tube. And the divider of the present invention is located away from the outlet end of the powder coating of the nozzle. The powder can pass through a longer distance after passing through the partition, so that the powder coating is not forked when sprayed.

Furthermore, the plurality of partition flaps are obliquely and alternately arranged on the inner wall of the spray pipe, the oblique arrangement of the partition flaps aims to elastically adjust the gap between the partition flaps and the electrode pipe, the zero distance between the partition flaps and the electrode pipe can be tightly matched, and the electrode pipe can be ensured to be always positioned at the center of the spray pipe. Preferably, three partition flaps are arranged on the inner wall surface of the nozzle.

Furthermore, the locking threaded sleeve is sleeved outside the spray pipe, one end of the locking threaded sleeve is connected with the spray pipe, and the other end of the locking threaded sleeve is in threaded connection with the insulating cover.

Specifically, the diameter of one end of the locking threaded sleeve connected with the insulating cover is larger than that of the first opening. Through the threaded connection between locking swivel nut and the insulating boot, can fix the locking screw outside the rifle casing.

The utility model provides a powder static spray gun subassembly, includes the corona ring and a powder static spray gun, the corona ring cover outside the shower nozzle subassembly, the corona ring include ring casing and electricity-absorbing needle, its characterized in that electricity-absorbing needle one end fixed mounting in the ring casing, the upper surface of ring casing be provided with the gas pocket, the electricity-absorbing needle other end wear out the ring casing by the gas pocket, the ring casing be provided with the trachea, compressed gas is discharged from the leading-in follow gas pocket of trachea.

Drawings

The present invention will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and should not be taken as limiting the scope of the present invention. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.

FIG. 1 is a schematic structural view of an electrostatic powder spray gun according to the present invention;

FIG. 2 is a cross-sectional view of an electrostatic powder spray gun of the present invention;

FIG. 3 is a schematic view of the gun housing of the present invention;

FIG. 4 is a schematic diagram of the internal structure of the electrostatic powder spray gun of the present invention;

FIG. 5 is a cross-sectional view of the showerhead assembly of the present invention;

FIG. 6 is a schematic structural view of the inner powder tube of the present invention;

FIG. 7 is an exploded view of the inner powder tube of the present invention;

FIG. 8 is a sectional view showing a used state of the inner powder tube according to the present invention;

FIG. 9 is a schematic view of the powder travel path of a prior art inner powder tube;

FIG. 10 is a schematic structural view of a corona ring of the present invention;

FIG. 11 is a front view of a corona ring of the present invention;

FIG. 12 is a cross-sectional view of section AA in FIG. 11;

fig. 13 is a schematic structural view of an electrostatic powder spray gun assembly of the present invention.

Wherein the reference numerals are specified as follows: 1. a gun housing; 1a, a gun barrel part; 1b, a handle portion; 2. a high voltage electrostatic module; 3. an insulating cover; 4. a showerhead assembly; 5. a first gun housing; 6. a second gun housing; 7. a first opening; 8. a baffle plate; 9. an inner powder tube; 10. a second opening; 11. a multi-way plate; 11a, a substrate; 11b, a mounting ring; 12. a third opening; 13. a power switch; 14. a trigger; 15. a nozzle; 16. locking the threaded sleeve; 17. an electrode tube; 18. a septal flap; 19. a powder passage;

21. a barrel section; 22. a connecting section; 22a, a bent plate; 22b, a cover plate; 23. a handle section; 25. connecting the bosses;

31. a ring housing; 31a, an upper shell; 31b, a lower housing; 32. an electricity suction needle; 33. air holes; 34. an air pipe; 35. conducting rings; 36. a mounting seat; 37. an inner retainer ring; 38. an outer retainer ring; 39. a locking member; 40. a connecting member.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 4: the utility model provides a powder static spray gun, includes rifle casing 1, shower nozzle subassembly and sets up high-voltage static module 2 in rifle casing 1, rifle casing 1 in be provided with insulating boot 3, high-voltage static module 2's output whole or part be located insulating boot 3, the periphery joint gap between insulating boot 3 and static module 2 is sealed with insulating cement, through insulating boot 3 with the isolated division of the ambient air of 2 outputs of high-voltage static module and the air of 3 peripheries of insulating boot, can avoid high-voltage static module 2 at the during operation, because the output air communicates with each other with the outer air of insulating boot 3, and produces the high-voltage discharge phenomenon. The insulating cover 3 partially extends out of the gun shell 1 to be connected with the spray head assembly 4, and a sealing structure is arranged between the insulating cover 3 and the gun shell 1. The high-tension electrostatic module 2, located within the insulating housing 3, can be directly connected to the showerhead assembly 4 without being directly exposed to the environment within the gun housing 1.

Further preferred embodiments of the present invention: the gun shell 1 comprises a first gun shell 5 and a second gun shell 6, the first gun shell 5 and the second gun shell 6 are connected to form the gun shell, and a sealing structure is arranged between the first gun shell 5 and the second gun shell 6, so that the gun shell 1 becomes a relatively sealed environment. One of them can completely cut off the intercommunication of the air in the gun shell 1 and the air outside the gun shell 1, and avoid the corona discharge phenomenon generated by high-voltage static electricity. Secondly, powder particles such as powder coating and dust in the spraying environment can be prevented from entering the gun shell 1, and therefore electrical faults caused by poor insulation of electrical elements in the gun shell can be avoided.

The traditional gun shell 1 is designed by adopting an integral sleeve rear opening type gun shell, and is produced by adopting an injection molding process by using plastic with insulating property. Because receive the fashioned restriction of mould drawing of patterns, the design of the appearance of rifle casing 1 and inner structure has all received certain restriction for work such as the installation of inside spare part, wiring are all gone on in the opening hole around the rifle casing 1, make the operation of installation and maintenance all very inconvenient, influence work efficiency. And the sleeve-like gun case 1 is difficult to seal. The existing electrostatic powder spray gun is difficult to completely seal the inside and the outside of the gun shell 1 so as to isolate the air inside and outside the gun shell 1.

The invention is characterized in that a raised strip is arranged on the first gun shell 5 along the connecting surface thereof, a limit groove is arranged on the second gun shell 6 along the connecting surface thereof, and the raised strip is embedded into the limit groove when the first gun shell 5 is connected with the second gun shell 6, thereby realizing the stable buckling of the first gun shell 5 and the second gun shell 6. The limiting groove is internally provided with a sealing strip, and the raised strip is connected with the limiting groove through the sealing strip. The connection of the first and second casings 5, 6 of the present invention thus far achieves a good seal.

The gun case 1 of the electrostatic powder spray gun is inevitably provided with a plurality of openings for introducing and discharging the powder coating material, controlling the power switch 13, and the like. The present invention is structurally improved to achieve relative isolation of the internal environment of the gun housing 1 from its external environment.

Specifically, the gun housing 1 includes a gun barrel portion 1a and a handle portion 1b, the gun housing 1 is provided with a first opening 7 for the insulation cover 3 to penetrate through, and the first opening 7 is located on the gun barrel portion 1a. The inner side of the first opening 7 is provided with a first clamping groove, the insulating cover 3 is provided with a baffle 8, the baffle 8 is arranged at the first clamping groove, and a sealing structure is arranged between the baffle 8 and the first clamping groove.

The direct sealing connection structure between the first opening 7 of the gun case 1 and the insulating cover 3 is difficult and the connection reliability is not high. According to the invention, the first clamping groove is formed in the first opening 7, the baffle plate 8 is arranged on the insulating cover 3, the sealing ring is arranged on the peripheral surface of the baffle plate 8, and the baffle plate 8 is connected with the first clamping groove through the sealing ring. The first clamping groove is located on the inner wall of the gun shell body 1, and the baffle 8 installed in the first clamping groove is attached to the inner side of the first opening 7. The baffle plate 8 is structurally arranged, so that the stability of the installation of the insulating cover 3 in the gun shell 1 is effectively improved, and the sealing reliability of the gun shell is improved.

The head of the insulating cover 3 is of a circular tubular structure, external threads are arranged on the surface of the insulating cover 3, internal threads are arranged on the spray head assembly 4, and the spray head assembly 4 is in threaded connection with the insulating cover 3. Elastic parts such as sealing rings and the like can be additionally arranged on the connecting surface of the two parts, so that good sealing performance can be achieved.

The gun shell 1 is provided with a second opening 10 for extending the inner powder tube 9, and the second opening 10 is positioned on the lower end surface of the handle part 1b. A multi-pass plate 11 is arranged outside the inner powder tube 9, and the inner powder tube 9 is connected with the second opening 10 through the multi-pass plate 11. The multi-way plate 11 comprises a base plate 11a and a plurality of mounting rings 11b arranged on the base plate 11a, wherein the mounting rings 11b are communicated with two side end surfaces of the base plate 11 a. The inner side of the second opening 10 is provided with a second clamping groove, the multi-way plate 11 is embedded into the second clamping groove, the multi-way plate 11 is connected with the second clamping groove, and a sealing structure is arranged between the multi-way plate 11 and the second clamping groove. The outer peripheral surface of the multi-way plate 11 is provided with a sealing ring, and the multi-way plate 11 is connected with the second clamping groove through the sealing ring. The inner powder tube 9 is connected with the multi-way plate 11. Specifically, the inner powder tube 9 passes through one of the mounting rings 11b and passes through the second opening 10, the inner powder tube 9 is connected with the mounting ring 11b, and a sealing structure is arranged between the inner powder tube 9 and the mounting ring 11 b.

The upper end of the inner powder tube 9 is connected with the insulating cover 3. Specifically, the insulation cover 3 is provided with a powder passage 19, and the powder passage 19 is communicated with the head of the insulation cover 3. The upper end of the inner powder tube 9 is connected to a powder passage 19. Powder coating material is introduced into the spray gun from the inner powder tube 9 and then delivered to the spray head assembly 4 via the powder passage 19.

The second mounting ring 11b of the present invention can be connected to an air line, and the inner powder tube 9 is provided with a corresponding air line interface. According to one scheme, a connecting pipe is arranged in a gun shell 1 and is communicated with an inner powder pipe 9 and an air pipeline, and air in the air pipeline is led into the inner powder pipe 9. In another scheme, because the gun housing 1 of the present invention has good sealing performance, the gun housing 1 itself can serve as a connecting structure, and the gas introduced into the gun housing 1 through the gas pipeline can also enter the gas pipeline interface of the inner powder pipe 9. In this scheme, the security of whole structure is considered, can set up the relief valve on rifle casing 1, and after the atmospheric pressure in rifle casing 1 reached certain numerical value, will follow the relief valve and discharge, avoid the atmospheric pressure in rifle casing 1 too big.

The gun shell 1 is provided with a third opening 12, a power switch 13 is installed at the third opening 12, and the power switch 13 can be turned on by the movement of a trigger 14. The power switch 13 is provided with a sealing ring, the wall surface of the third opening is provided with a recess for embedding the sealing ring, and the power switch 13 is connected with the wall surface of the third opening 12 through the sealing ring. The third opening 12 is located on the side of the handle portion 1b. Further, the surface of the gun housing 1 is provided with a groove, the groove is positioned on the side surface of the handle part 1b, the trigger 14 is arranged at the groove, and the trigger 14 is covered outside the power switch 13. The trigger 14 is connected with the wall surface of the groove through a shaft, the trigger 14 can rotate around the shaft, and the third opening 12 is arranged on one side wall surface of the groove.

The gun shell 1 is provided with a first opening 7, a second opening 10 and a third opening 12 which are respectively used for introducing powder coating, an inner powder tube 9 and a power switch 13. Thus, the present invention achieves sealing over the first opening 7, the second opening 10, and the third opening 12. Isolating the air between the environment inside the gun housing 1 and the outside environment.

The invention further discloses the structure of the inner powder tube 9. As shown in fig. 6 to 8: the inner powder tube comprises a gun barrel section 21 and a connecting section 22 which are communicated with each other, the connecting section 22 is an arc-shaped section, the gun barrel section 21 is located at a gun barrel part 1a of the spray gun, the connecting section 22 is connected at an inlet end of the gun barrel section 21, and the inner ring wall surface of the connecting section 22 is connected with the end surface of the gun barrel section 21. Powder is directed from the connecting section 22 into the barrel section 21. When the powder enters the connecting section 22, the powder cannot pass through without obstacles because the powder is not in the straight pipe section but in the arc section, the powder is suddenly forced to change the motion track along an arc line under the state of uniform linear motion to play a role of acceleration, the accelerated powder is ejected out along the inner wall of the connecting section 22 under the action of centrifugal force to collide with the gun barrel section 21, and the powder is splashed and atomized after the powder is rebounded after the small-area concentrated continuous collision. The powder is thus concentrated on the wall of the connecting section 22, away from the end of the barrel section 21 and pushed back by the air flow, thereby slowing the powder flow. Therefore, the invention can optimize the powder movement, so that the powder can uniformly pass through the gun barrel section 21 powder tube, and good spraying atomization and adhesion effects are achieved.

Further preferred embodiments of the present invention: the diameter of the inner ring wall surface of the connecting section 22 is smaller than that of the outer ring wall surface of the connecting section. I.e. the direction of curvature or projection of the connecting section is towards the outer circumferential wall of the connecting section 22.

The inner powder tube further comprises a handle section 23, the upper end of the connecting section 22 is communicated with the gun barrel section 21, and the lower end of the connecting section 22 is communicated with the handle section 23. The handle section is located at the handle part of the spray gun, the gun barrel section 21 is located at the gun barrel part 1a of the spray gun, and the connecting section 22 is also located at the handle part of the spray gun. In actual use, the lower end of the handle segment 23 protrudes out of the handle gun housing 1 of the spray gun and connects the sprayed powder.

In the use state, the handle segment 23 is connected to a duct for supplying powder. In the product configuration, the connecting section 22 of the present invention includes a bent plate 22a and a cover plate 22b, and the cover plate 22b is mounted to the bent plate 22a. The connecting section 22 of the present invention is a curved arc tube, so that it is difficult to integrally form the connecting section 22, and it is difficult to perform core pulling work. Therefore, the connecting section 22 is configured as a structure formed by the bent plate 22a and the cover plate 22b, and the problems of the present invention in the production process are solved.

In particular, the powder tube 9 in the spray gun of the present invention is constructed of two parts, namely, the cover plate 22b and the other parts. The bending plate 22a and the gun barrel section 21 are integrally formed, and the bending plate 22a and the handle section 23 are integrally formed. Not only realizes the processing and forming of the product, but also realizes higher integral strength. The inner side of the connecting section 22 is provided with the bent plate 22a, the outer side of the connecting section 22 is provided with the cover plate 22b, and the top end of the cover plate 22b is connected with the end part of the gun barrel section 21. The forming difficulty of the product is greatly reduced.

The structural principle of the invention is as follows: the connecting section 22 is designed such that powder will be introduced into the barrel section 21 through the connecting section 22. The connection section 22 is designed to be an arc-shaped section, and the arc-shaped section is bent towards the side where the gun barrel section 21 is located. Then, during the process that the powder passes through the arc-shaped section, the powder is inevitably acted by the wall surface of the arc-shaped section, and compared with the original unobstructed straight channel and the straight-bent channel which are not bent along an arc line, the bent channel accelerates the powder passing through the arc-shaped section, and the powder is accelerated in the arc-shaped section. The accelerated powder enters the barrel section 21, and even if the powder collides with the wall surface of the barrel section 21, the generated reaction force is increased, thereby improving the atomization effect of the powder after collision.

Secondly, the powder accelerates to pass through the arc-shaped section under the action of centrifugal force, and the powder can pass through along the inner wall of the pipe on the outer ring of the arc-shaped section under the action of centrifugal force. The invention takes one side close to the circle center of the arc-shaped section as an inner ring and takes one side far away from the circle center of the arc-shaped section as an outer ring. The inner ring of the arc-shaped section is connected with the end part of the gun barrel section 21, and the outer ring of the arc-shaped section is far away from the end part of the gun barrel section 21. The powder arriving at the barrel section 21 from the arc section will be away from the end of the barrel section 21 and the air flow at the end of the barrel section 21 will carry the powder entering the barrel section 21 towards the outlet of the barrel section 21. I.e. into the barrel section 21, the atomized powder will be uniformly distributed in the barrel and will flow forward along the duct under the push of the gas flow, so that the gas can uniformly guide the powder to the outlet of the barrel section 21.

As shown in fig. 9, in the prior art, a straight pipeline is used as the connecting section 22 leading into the gun barrel section 21, the powder is firstly gathered in the middle of the connecting section 22 and enters, the distance between the powder entering the gun barrel section 21 and the end of the gun barrel section 21 is short, and the gas is difficult to scatter the powder and lead the powder into the gun barrel section 21 uniformly. Secondly, the powder entering the gun barrel section 21 is at a predetermined angle, the powder passing through the straight pipeline is not accelerated, all the existing bent powder pipes are straight bent powder pipes, the angles are obtuse angles, and when the powder collides with the wall surface of the gun barrel section 21 in a large area at a low speed. The powder is collided and then is not concentrated because of the slow speed, so the powder rebounding force is small, the powder is blown away by the airflow without bouncing back, and flows to the outlet along the upper wall of the pipeline of the gun barrel section 21, and because the incident angle of the powder and the gun barrel section 21 is an obtuse angle, the rebounding force of the powder tends to the outlet end of the gun barrel to accelerate the flowing speed of the powder, because the powder is not acted by the centrifugal force generated by an arc track, the flowing speed of the powder is not accelerated, the powder does not move in a concentrated way along the wall of the gun barrel section 21 but collides with the wall of the gun barrel section 21 in a large area, and as a result, firstly, the atomization effect is influenced, and under the conditions that the powder atomization state is insufficient and the flow speed is accelerated, the powder is often sprayed out to one side, and the ideal spraying effect cannot be achieved.

The further preferable scheme of the invention is as follows: the upper end of the connecting section 22 forms an acute angle with the gun barrel section 21. Specifically, the upper end of the connecting section 22 is communicated with the gun barrel section 21, and an included angle between the upper end of the connecting section 22 and the gun barrel section 21 is an acute angle. The powder entering the barrel section 21 from the connecting section 22 will now be introduced at an angle oblique to the barrel section 21. The powder collides with the wall surface of the barrel section 21 and the reaction force after the collision is concentrated and accelerated is in the same angular and opposite direction. However, under the pushing of the air flow, the powder after high-speed rebound is blown away when the powder is shot to the central position of the tube cavity of the section 1 of the gun barrel, so that the problem that the powder is blown to crawl along the upper wall of the tube cavity of the section 1 of the gun barrel before rebounding due to low-speed non-concentrated collision force as in a straight bent powder tube, which causes the uneven spraying state that the sprayed powder deviates to one side, is avoided, and a better uniform spraying and atomizing effect can be achieved.

The handle section 23 or the connecting section 22 is provided with a connecting boss 25, and the connecting boss 25 is connected with the gun shell 1 in a matching way. The gun shell body 1 is internally provided with a fixed clamping groove, and the connecting boss 25 is embedded into the fixed clamping groove, so that the powder tube 9 in the spray gun is relatively fixed, and the powder tube 9 is not easy to shake or shift due to stress.

The surface of the handle section 23 is sleeved with a sealing ring, and the handle section 23 is connected with the spray gun through the sealing ring. Specifically, the lower end of the handle section 23 in the present invention is the gun housing 1 which extends out of the spray gun. It is then necessary that the grip section 23 is sealed from the gun housing 1 to avoid leakage of high voltage static electricity from the gun housing 1.

The present invention further discloses the structure of the showerhead assembly 4. As shown in fig. 2 and 5, the spray head assembly 4 comprises a spray pipe 15, a locking screw 16 and an electrode tube 17, the insulating cover 3 is provided with a powder passage 19, the spray pipe 15 is communicated with the powder passage 19, and the electrode tube 17 is positioned on the axis of the spray pipe 15. The spray head assembly 4 is connected to the gun housing 1, in particular the insulating cap 3, by means of a locking screw 16. A nozzle 15 is provided for the passage of powder coating material and an electrode tube 17 is provided for the introduction of high voltage static electricity. The electrode tube 17 is located on the axis of the nozzle 15, that is, the electrode tube 17 is located at the center of the nozzle 15, so as to ensure that the atomized powder sprayed from the nozzle 15 is uniformly charged with static electricity, thereby achieving a good spraying effect.

The inner wall surface of the spray pipe 15 is provided with a plurality of partition flaps 18, the partition flaps 18 are arranged on one side close to the insulating cover 3, the plurality of partition flaps 18 act on the periphery of the electrode tube 17, and the electrode tube 17 is limited at the center of the spray pipe 15 through the partition flaps 18. The electrode tube 17 is limited by arranging the partition valve 18, so that the electrode tube 17 is ensured to be positioned at the center of the spray tube 15. Furthermore, the partition 18 according to the invention is arranged close to the side of the insulating housing 3, i.e. away from the outlet end of the powder coating material of the nozzle 15. Any longer distance that the powder travels after passing through the divider 18 is required to ensure that the powder coating material does not diverge as it is sprayed. The plurality of partition flaps 18 are obliquely and alternately arranged on the inner wall of the spray pipe 15, the purpose of oblique arrangement of the partition flaps 18 is to elastically adjust the gap between the partition flaps 18 and the electrode pipe 17, zero distance between the partition flaps 18 and the electrode pipe 17 can be tightly matched, and the electrode pipe 17 can be ensured to be always positioned at the central position of the spray pipe 15. Preferably, three partition flaps 18 are arranged on the inner wall surface of the nozzle 15.

The locking screw sleeve 16 is sleeved outside the spray pipe 15, one end of the locking screw sleeve 16 is connected with the spray pipe 15, and the other end of the locking screw sleeve 16 is in threaded connection with the insulating cover 3. The diameter of the end of the locking screw sleeve 16 connected with the insulating cover 3 is larger than that of the first opening 7. The locking screw can be fixed outside the gun housing 1 by the threaded connection between the locking screw sleeve 16 and the insulating cover 3.

An electrostatic powder spray gun assembly comprising a corona ring and said electrostatic powder spray gun,

as shown in fig. 10: the corona ring comprises a ring shell 31 and a plurality of electricity-absorbing needles 32, wherein the electricity-absorbing needles 32 are regularly arranged into a circular ring, and the electricity-absorbing needles 32 are uniformly distributed by taking the axial direction of the ring shell 31 as the center. The attraction pins 32 are grounded, the exposed parts of the attraction pins attract corona of high-voltage static electricity radiated from a muzzle, and the attraction pins 32 attract electric charges simultaneously, so that an environmental magnetic field can be homogenized and weakened.

One end of the electricity suction needle 32 is fixedly arranged in the ring shell 31, the upper surface of the ring shell 31 is provided with an air hole 33, the other end of the electricity suction needle 32 penetrates out of the ring shell 31 through the air hole 33, the ring shell 31 is provided with an air pipe 34, and air is guided into the air pipe 34 and is discharged from the air hole 33. The air hole 33 is provided so that air flows around the outer circumference of the suction needle 32. The circulation of the gas around the suction needle 32 can prevent the powder from adhering to the surface of the suction needle 32. The problem that the shunting effect of the electric field is weakened after the corona ring is used for a period of time can be solved.

As shown in fig. 11 and 12, a mounting seat 36 is provided in the ring housing 31, and the suction needle 32 is fixed by the mounting seat 36. The suction needle 32 is an elongated needle-like structure, and it is apparent that the elongated suction needle 32 is not easily fixedly installed. One end of the suction needle 32 is used for installation, and the other end of the suction needle 32 is a suction end. When one end of the suction pin 32 is mounted, if there is a deviation in displacement or angle, there is a large deviation in the other end of the suction pin 32.

It is ensured that the motor pin can be mounted in the predetermined axial direction. The present invention is designed to have a tubular structure of the mounting seat 36, and one end of the suction needle 32 is inserted into the mounting seat 36. The tubular mounting seat 36 can wrap the large section of the suction needle 32, so that the suction needle 32 is stably mounted, the suction needle 32 is prevented from deviating, and the suction needle 32 is ensured to be positioned in the center of the air hole 33.

Further, the diameter of the air hole 33 is larger than the diameter of the electric needle 32 located in the air hole 33. That is, when the suction needle 32 is installed coaxially with the air hole 33, a gap is formed between the entire outer peripheral surface of the suction needle 32 and the wall surface of the air hole 33. The gas introduced from the gas pipe 34 is discharged from the outer circumference of the suction needle 32 and the gas flow is uniformly distributed on the outer surface of the suction needle 32. Thereby preventing the powder from adhering to the surface of the suction needle 32 and not affecting the function of the suction needle 32.

The upper surface of the ring shell 31 is provided with an inner retainer ring 37 and an outer retainer ring 38, the inner retainer ring 37 is located on the inner side of the electricity-absorbing needle 32, and the outer retainer ring 38 is located on the outer side of the electricity-absorbing needle 32. According to the invention, the electric suction needle 32 is wrapped by the inner retainer ring 37 and the outer retainer ring 38, so that a good protection effect is achieved, and a user is prevented from touching the electric suction needle 32 by mistake. The inner retainer ring 37 and the outer retainer ring 38 are integrally formed with the ring housing 31.

The ring shell 31 of the invention is internally provided with a conducting ring 35, and the electricity suction needle 32 penetrates through the conducting ring 35. The suction pins 32 are connected by a conductive ring 35. The conducting ring 35 is grounded and connected with each of the suction pins 32, and the end of each suction pin 32 sucks the high voltage corona radiated from the muzzle electrode pin.

The conducting ring 35 is an elastic body, and the electricity suction needle 32 is connected with the conducting ring 35 in an interference manner. The conductive ring 35 is used as the ground wire access terminal, and the reliability of the connection between the conductive ring 35 and the suction needle 32 will determine the performance of the present invention. The diameter of the suction needle 32 is small, and grounding is difficult to achieve. Therefore, the elastic conducting ring 35 is connected with the electricity suction needle 32 in an interference manner, and the reliability of connection between the electricity suction needle 32 and the conducting ring 35 is ensured.

The conducting ring 35 can be made of a graphite rubber composite material, and the graphite rubber composite material has elasticity and can support interference connection between the conducting ring 35 and the electricity suction needle 32. The conducting ring 35 of the present invention can be made of graphite material, and the graphite material has conductivity. Specifically, the graphite rubber composite material is a material obtained by adding graphite to rubber, and the material has both elasticity of rubber and conductivity of graphite.

The corona ring 31 of the present invention may specifically include an upper shell 31a and a lower shell 31b. The air hole 33, the inner retainer 37 and the outer retainer 38 are located in the upper shell 31a, and the lower shell 31b is provided with the mounting seat 36 and the air pipe 34 penetrating through the whole lower shell 31b. The air tube 34 may communicate the external environment with the interior of the housing 31. When installed, the conductive ring 35 may be mounted on the surface of the lower housing 31b or inside the lower housing 31b, specifically above the mounting seat 36 or below the mounting seat 36. The suction needle 32 is mounted on the mounting seat 36, and the suction needle 32 penetrates the conductive ring 35, and the two are connected in an interference manner. The assembled lower housing 31b is then assembled into the upper housing 31b, and specifically the suction pins 32 are inserted through the air holes 33 in the upper housing 31 a. Finally, the upper shell 31a and the lower shell 31b are hermetically and fixedly connected, and the upper shell 31a and the lower shell 31b form a ring shell 31, and a cavity is left inside. The compressed gas enters the cavity from the gas pipe 34 and then is discharged from the gas hole 33.

As shown in figure 13, the corona ring is sleeved on the spray head assembly 4 of the powder electrostatic spray gun, and the air pipe 34 of the corona ring is communicated with an air pipeline in the spray gun. The air passage through the spray gun provides air flow for the corona ring, and the corona ring is not required to be additionally connected with an air pump.

The corona ring is connected with the spray gun, and the spray gun provides a grounding end for the corona ring. The air pipe 34 on the corona ring is provided with a locking part 39, the spray gun is provided with a connecting part 40, the connecting part 40 is communicated with an air pipeline, and the air pipe 34 is connected with the connecting part 40 through the locking part 39.

The connecting piece 40 can adopt a valve, and the surface of the connecting piece 40 is provided with external threads. The locking member 39 is a nut, the locking member 39 is mounted on the air tube 34, and the locking member 39 can rotate relative to the air tube 34. The connector 40 can be butted against the air tube 34 by locking the connection of the locker 39 and the connector 40. The gas pipeline is provided with a one-way valve. The discharge of compressed air is avoided when the electrostatic spray gun works under the condition that no corona ring is installed.

The present invention has been described in detail, and the principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the present invention and the core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (9)

1. A powder electrostatic spray gun comprises a gun shell (1), a spray head assembly (4) and a high-voltage electrostatic module (2) arranged in the gun shell (1), and is characterized in that an insulating cover (3) is arranged in the gun shell (1), the output end of the high-voltage electrostatic module (2) is wholly or partially positioned in the insulating cover (3), part of the insulating cover (3) extends out of the gun shell (1) to be connected with the spray head assembly (4), and a sealing structure is arranged between the insulating cover (3) and the gun shell (1); the powder spraying gun is characterized in that a second opening (10) for the inner powder pipe (9) to extend out is formed in the gun shell (1), the inner powder pipe comprises a gun barrel section (21) and a connecting section (22) which are communicated with each other, the gun barrel section (21) is located in a gun barrel part (1 a) of the spraying gun, the connecting section (22) is connected to the inlet end of the gun barrel section (21), the connecting section (22) is an arc-shaped section, and the circle center of a circle where the connecting section (22) is located on one side, far away from the gun barrel section (21), of the connecting section (22); the upper end of the connecting section (22) is communicated with the gun barrel section (21), the upper end of the connecting section (22) forms an acute angle with the gun barrel section (21), and powder entering the gun barrel section (21) from the connecting section (22) is led in at an angle inclined to the gun barrel section (21); the powder collides with the wall surface of the gun barrel section (21), and the reaction force after the concentrated acceleration collision is opposite to the same angle.

2. An electrostatic powder spray gun according to claim 1, characterized in that the gun housing (1) comprises a first gun housing (5) and a second gun housing (6), the first gun housing (5) and the second gun housing (6) are connected to form the gun housing, a sealing structure is arranged between the first gun housing (5) and the second gun housing (6), and the connection surface of the first gun housing (5) and the second gun housing (6) is a vertical surface parallel to the axial direction of the gun housing (1).

3. The electrostatic powder spray gun according to claim 1, wherein the gun housing (1) is provided with a first opening (7) for the insulating cover (3) to pass through, a first clamping groove is formed in the inner side of the first opening (7), the insulating cover (3) is provided with a baffle (8), the baffle (8) is installed in the first clamping groove, and a sealing structure is arranged between the baffle (8) and the first clamping groove.

4. An electrostatic powder spray gun as claimed in claim 1, characterized in that the insulating housing (3) is partly of a round tubular construction provided with an external thread on its surface, the spray head assembly (4) is provided with an internal thread, and the spray head assembly (4) is screwed into the insulating housing (3).

5. An electrostatic powder spray gun according to claim 1, characterized in that a multi-pass plate (11) is arranged outside the inner powder tube (9), the inner powder tube (9) is connected with the multi-pass plate (11), and the multi-pass plate (11) is connected with the second opening (10).

6. The electrostatic powder spray gun according to claim 1, wherein the gun housing (1) is provided with a third opening (12), a power switch (13) is installed at the third opening (12), a sealing structure is arranged between the power switch (13) and the third opening (12), the power switch (13) is covered with a trigger (14), and the power switch (13) can be opened by the movement of the trigger (14).

7. An electrostatic powder spray gun as claimed in claim 1, characterized in that the spray head assembly (4) comprises a spray tube (15), a locking nut (16) and an electrode tube (17), the insulating housing (3) is provided with a powder passage (19), the spray tube (15) communicates with the powder passage (19), and the electrode tube (17) is located on the axis of the spray tube (15).

8. An electrostatic powder spray gun according to claim 7, characterized in that the inner wall surface of the nozzle (15) is provided with a plurality of partition flaps (18), the plurality of partition flaps (18) act on the outer periphery of the electrode tube (17), and the electrode tube (17) is limited at the center of the nozzle (15) through the partition flaps (18).

9. An electrostatic powder spray gun assembly, characterized by comprising a corona ring and an electrostatic powder spray gun according to any one of claims 1 to 8, wherein the corona ring is sleeved outside the spray head assembly (4), the corona ring comprises a ring housing (31) and a power-sucking needle (32), one end of the power-sucking needle (32) is fixedly installed in the ring housing (31), an air hole (33) is formed in the upper surface of the ring housing (31), the other end of the power-sucking needle (32) penetrates out of the ring housing (31) through the air hole (33), an air pipe (34) is arranged on the ring housing (31), and compressed air is introduced from the air pipe (34) and is discharged from the air hole (33).

Images