CN113198630B

CN113198630B - Powder pipe and powder electrostatic spray gun in spray gun

Info

Publication number: CN113198630B
Application number: CN202110462110.XA
Authority: CN
Inventors: 刘君; 龙开成; 龙开华; 龙开相; 毛鹏磊
Original assignee: Ningbo Licheng Coating Technology Co ltd
Current assignee: Ningbo Licheng Coating Technology Co ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2022-08-05
Anticipated expiration: 2041-04-27
Also published as: CN113198630A

Abstract

The invention discloses a powder tube in a spray gun and a powder electrostatic spray gun, which comprise a gun barrel section and a connecting section communicated with the gun barrel section, wherein the gun barrel section is positioned in the spray gun, a first wall surface is arranged in the connecting section, the first wall surface is a curve in a plane formed by the axis of the gun barrel section and the center line of the connecting section, the first wall surface in the connecting section is arranged close to an outlet of the gun barrel section, and powder enters the gun barrel section through the connecting section. The powder can be optimized to move, so that the powder can uniformly pass through the gun barrel section powder pipe, and a good spraying effect is achieved.

Description

Powder pipe and powder electrostatic spray gun in spray gun

Technical Field

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

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.

For example, the Chinese utility model patent "electrostatic spraying and heating integrated gun" applies for (patent): CN201620398926.5, a powder tube structure of a handle section and a powder tube structure of a gun barrel section; the Chinese utility model patent 'a novel electrostatic powder spray gun', application (patent) No.: cn201820949184.x, powder tube structure disclosed; and the Chinese utility model patent "a powder spraying type electrostatic spray gun", application (patent) No.: CN201920961218.1, a structure of powder passing tube is disclosed. The sprayed powder needs to pass through the handle section powder pipe and then enter the gun barrel section powder pipe. The powder tube needs to pass through a bend in the whole flowing process. However, in the whole flowing process, the powder reaching the gun barrel section powder pipe from the handle section powder pipe collides with the wall surface of the gun barrel section powder pipe along with the air flow. The powder is disturbed after collision, the phenomenon of partial powder aggregation can occur, and partial powder repeatedly collides with a gun barrel section powder tube. The powder sprayed out from the nozzle of the spray gun is easy to gather at one side, the spraying is uneven, and the spraying effect is not good.

Disclosure of Invention

The invention aims to solve the technical problem of providing a powder tube in a spray gun and a powder electrostatic spray gun, which can optimize powder movement, so that powder can uniformly pass through a powder tube at a gun barrel section, and a good spraying effect is achieved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a powder pipe in spray gun, includes barrel section and the linkage segment that communicates with barrel section, barrel section be located the spray gun, the linkage segment in be equipped with first wall, first wall is the curve in the plane that the axis of barrel section and the central line of linkage segment constitute, the linkage segment is crooked to one side at barrel section place, the export setting that the first wall in the linkage segment is close to barrel section, the powder enters into barrel section through the linkage segment, the powder that enters into the linkage segment is pressed close to first wall and is passed through the linkage segment.

Compared with the prior art, the invention has the advantages that: first, the connecting section is designed to be connected with the barrel section, and the powder is guided into the barrel section through the connecting section. Secondly, the invention designs the connecting section as a connecting section. Then, during the powder passing through the connection section, the powder is inevitably acted by the wall surface of the connection section, and compared with the original unobstructed straight channel and the straight curved channel without arc curve, the arc curved channel changes the running track of the powder of the traditional electrostatic spray gun, so that the powder is forced to pass by adhering to the inner wall of the arc curved tube due to centripetal force, and the powder is accelerated at the connection section. The powder after accelerating enters into the barrel section for the powder takes place the concentrated and lasting clash of little area with the wall of barrel section, and the reaction force that produces also increases, thereby makes the powder fill in the striking with the pipe wall and disperses, plays good atomization effect.

The invention further defines that a first wall surface is arranged in the connecting section, the first wall surface is a curve in a plane formed by the axis of the gun barrel section and the center line of the connecting section, and the first wall surface is arranged close to the outlet of the gun barrel section. The passage of the powder through the curved surface requires a centrifugal force through the connecting piece, which is provided by the first wall surface, so that the powder will pass against the connecting piece wall surface. That is to say, the powder that reaches the barrel section from the connection section will be closer to the barrel section exit end, and the air current will drive the powder that enters the barrel section and lead to the exit end of barrel section. I.e., into the barrel section, the powder will collect in the direction of the gas travel so that the gas will uniformly direct the powder toward the outlet end of the barrel section.

Further preferred embodiments of the present invention: the inner powder tube further comprises a handle section, the upper end of the connecting section is communicated with the gun barrel section, and the lower end of the connecting section is communicated with the handle section.

The handle section is located at the handle part of the spray gun, the gun barrel section is located in the spray gun, and the connecting section is also located at the handle part of the spray gun. In actual use, the lower end of the handle segment extends out of the handle housing of the spray gun and connects the sprayed powder.

Furthermore, the upper end of the connecting section and the gun barrel section form an acute angle, which is the preferred scheme of the invention.

Specifically, the upper end of the connecting section is communicated with the gun barrel section, and the tangential direction of the upper end of the connecting section and the gun barrel section form an acute angle with each other. The powder entering the barrel section from the connecting section will now be introduced at an angle oblique to the barrel section. The powder and the wall surface of the gun barrel section are collided continuously, the counterforce after collision is in the same angle and opposite direction, the flowing direction of the powder is opposite due to the rebound force after collision, the powder can splash back to the direction of the nozzle in theory, but the fully atomized powder is collided with the incoming airflow at the moment, so that the powder is pushed back to the direction of the nozzle by the airflow to move, the speed is reduced, the state that the fully atomized powder is sprayed out from the gun mouth is softer, the powder adsorbed on a workpiece is not easy to spray and fall off, and the ideal spraying effect is achieved.

Furthermore, the connecting section is of an arc-shaped tubular structure and comprises a bent plate and a cover plate, and the cover plate is installed on the bent plate.

The connecting section is a bent arc-shaped pipe, so that the connecting section is difficult to integrally form on the basis of the existing die machining process, and core pulling work is difficult to complete. Therefore, the connecting section is set to be a structure formed by the bent plate and the cover plate, and the problems of the production process of the invention are solved.

Furthermore, the bent plate and the gun barrel section are integrally formed, and the bent plate and the handle section are integrally formed.

Specifically, the powder tube structure in the spray gun is formed by two parts, namely a cover plate and other parts. Not only realizes the processing and forming of the product, but also realizes higher integral strength.

Furthermore, the top end of the cover plate is connected with the end part of the gun barrel section. The inner side of the connecting section is provided with the bent plate, and the outer side of the connecting section is provided with the cover plate. The molding difficulty of the product is greatly reduced.

Furthermore, the cover plate is positioned on one side of the connecting section, which is far away from the gun barrel section, and the bent plate is positioned on one side of the connecting section, which is close to the gun barrel section. Specifically, the first avoidance is located on the bent plate. The utility model discloses improve the position of apron and bent plate to the position of the connection face of restriction apron and bent plate. The powder that enters into in the linkage segment can paste and lean on the apron because of receiving the effect of centrifugal force to avoid the powder to imbed the gap between apron and the bent plate, effectively improved interior powder pipe's play powder effect.

Furthermore, the surface of the handle section is sleeved with a sealing ring, and the handle section is connected with the spray gun through the sealing ring.

Specifically, the lower end of the handle section in the invention is a shell extending out of the spray gun. A sealing connection between the handle section and the gun housing is then required to avoid leakage of high voltage static electricity from the housing, while also effectively preventing powder dust from entering the gun housing.

The electrostatic powder spray gun comprises a gun shell, wherein a powder pipe in the spray gun is arranged in the gun shell.

Furthermore, a connecting boss is arranged on the handle section or the connecting section, and the connecting boss is connected with the gun shell in a matching way.

The gun shell is internally provided with a fixed clamping groove, and the connecting boss is embedded into the fixed clamping groove, so that the powder tube in the spray gun is relatively fixed, and the powder tube is not easy to shake and shift due to stress.

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 therefore should not be taken as limiting the scope of the 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 the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a sectional view showing a state in which the present invention is used;

FIG. 4 is a schematic view of a powder movement path of the prior art;

FIG. 5 is a schematic diagram of the final movement path of the present invention.

Wherein the reference numerals are specified as follows: 1. a barrel section; 2. a connecting section; 2a, bending a plate; 2b, a cover plate; 3. a handle section; 4. a seal ring; 5. and connecting the lug bosses.

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 and 3: the utility model provides a powder pipe in spray gun, includes barrel section 1 and the linkage segment 2 with barrel section 1 intercommunication, barrel section 1 be located the spray gun, linkage segment 2 in be equipped with first wall, first wall is the curve in the plane that the axis of barrel section 1 and the central line of linkage segment 2 constitute, linkage segment 2 is to one side bending at barrel section 1 place, the export setting that first wall in linkage segment 2 is close to barrel section 1, the powder enters into barrel section 1 through linkage segment 2. Powder is introduced into the barrel section 1 from the connecting section 2. Powder is getting into linkage segment 2, because non-straight tube section is the linkage segment, the accessible of powder is passed through, and the powder is forced suddenly under the uniform velocity linear motion state to change the motion track along the pitch arc and has played the effect of accelerating, and accelerating powder jets out and collides with barrel section 1 along 2 inner walls of linkage segment under the effect of centrifugal force, and the small area concentrates the powder that lasts to collide the back and splash the atomizing. The powder is thus concentrated on the wall of the connecting section 2, away from the end of the barrel section 1 and pushed back by the air flow, thus slowing down the powder flow. Therefore, the invention can optimize the powder movement, so that the powder can uniformly pass through the powder tube 1 of the gun barrel section, and good spraying atomization and adhesion effects are achieved.

Further preferred embodiments of the present invention: the inner powder tube further comprises a handle section 3, the upper end of the connecting section 2 is communicated with the gun barrel section 1, and the lower end of the connecting section 2 is communicated with the handle section 3. The handle section is located at the handle part of the spray gun, the gun barrel section 1 is located in the spray gun, and the connecting section 2 is also located at the handle part of the spray gun. In actual use, the lower end of the handle segment 3 extends out of the handle housing of the spray gun and connects the sprayed powder.

As shown in fig. 2, in the situation of use, the handle segment 3 is connected to a duct for supplying powder. In the product structure, the connecting section 2 is an arc-shaped tubular structure, the connecting section 2 of the invention comprises a bent plate 2a and a cover plate 2b, and the cover plate 2b is mounted on the bent plate 2 a. The connecting section 2 in the invention is a curved arc-shaped pipe, so that the connecting section 2 is difficult to integrally form and core pulling work is difficult to complete. Therefore, the connecting section 2 is configured as a structure formed by the bent plate 2a and the cover plate 2b, and the problems of the invention in the production process are solved.

Specifically, the powder tube structure in the spray gun is composed of two parts, namely a cover plate 2b and a bent plate 2 a. The bending plate 2a and the gun barrel section 1 are integrally formed, and the bending plate 2a and the handle section 3 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 2 is provided with the bent plate 2a, the outer side of the connecting section 2 is provided with the cover plate 2b, and the top end of the cover plate 2b is connected with the end part of the gun barrel section 1. The molding difficulty of the product is greatly reduced.

The structural principle of the invention is as follows: the connecting section 2 is designed such that the powder will be guided into the barrel section 1 via the connecting section 2. The invention designs the connecting section 2 as a connecting section, and the connecting section is bent towards one side of the gun barrel section 1. Then, during the passage of the powder through the connecting portion, the powder is inevitably subjected to the wall surface of the connecting portion, and the passage of the powder is accelerated in the connecting portion by the curved passage as compared with the conventional unobstructed straight passage and straight curved passage. The accelerated powder enters the gun barrel section 1, and even if the powder collides with the wall surface of the gun barrel section 1, the generated reaction force is increased, so that the atomization effect of the powder after collision is improved.

Secondly, the powder passes through the connecting section with higher speed under the action of centrifugal force, and the powder passes through along the inner wall of the connecting section under the action of centrifugal force. As shown in fig. 1, the powder reaching the gun barrel section 1 is close to the outlet end of the gun barrel section 1, and the air flow at the end of the gun barrel section 1 drives the powder entering the gun barrel section 1 to be guided to the outlet of the gun barrel section 1. Namely, the atomized powder enters the gun barrel section 1, and the atomized powder is uniformly distributed in the gun barrel and flows forwards along the pipeline under the pushing of the air flow, so that the air can uniformly guide the powder to the outlet of the gun barrel section 1.

As shown in fig. 4, in the prior art, a straight pipeline is used as the connecting section 2 leading into the gun barrel section 1, the powder can be concentrated in the middle of the connecting section 2 and enter, the distance between the powder entering the gun barrel section 1 and the end of the gun barrel section 1 is short, and the gas is difficult to scatter the powder and lead the powder into the gun barrel section 1 uniformly. Secondly, the powder enters the gun barrel section 1 at a preset angle, the powder passes through the straight pipeline and cannot be 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 1 at a low speed in a large area. The powder is slow and not concentrated after collision, 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 1, and because the incident angle of the powder and the gun barrel section 1 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 powder flowing is not accelerated, and the powder does not intensively creep along the wall of the pipe, but collides with the wall of the gun barrel section 1 in a large area, and as a result, the atomization effect is influenced. Under the condition that the powder atomization state is insufficient and the flow rate is accelerated, the powder is often sprayed out to one side, and the ideal spraying effect cannot be achieved.

Fig. 5 shows a further preferred embodiment of the present invention: the upper end of the connecting section 2 and the gun barrel section 1 form an acute angle. Specifically, the upper end of the connecting section 2 is communicated with the gun barrel section 1, and an included angle between the upper end of the connecting section 2 and the gun barrel section 1 is an acute angle. The powder entering the barrel section 1 from the connecting section 2 will now be introduced at an angle oblique to the barrel section 1. The powder collides with the wall surface of the barrel section 1 and the reaction force after the collision is intensively accelerated is in the same angle 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 electrostatic powder spray gun comprises a gun shell, wherein a powder pipe in the spray gun is arranged in the gun shell. The handle section 3 or the connecting section 2 is provided with a connecting boss 5, and the connecting boss 5 is connected with the gun shell in a matching way. The gun shell in be provided with fixed slot, connecting boss 5 imbed fixed slot in to realize the relative fixation of powder pipe in the spray gun, interior powder pipe atress is difficult to rock or shift.

The surface of the handle section 3 is sleeved with a sealing ring 4, and the handle section 3 is connected with the spray gun through the sealing ring 4. Specifically, the lower end of the handle section 3 in the invention is a shell extending out of the spray gun. A sealing connection between the handle section 3 and the gun housing is then required to avoid leakage of high voltage static electricity from the housing.

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

1. A powder tube in a spray gun is characterized by comprising a gun barrel section (1) and a connecting section (2) communicated with the gun barrel section (1), wherein the gun barrel section (1) is positioned in the spray gun, a first wall surface is arranged in the connecting section (2), the first wall surface is a curve in a plane formed by the axis of the gun barrel section (1) and the central line of the connecting section (2), the connecting section (2) is bent towards one side where the gun barrel section (1) is positioned, the first wall surface in the connecting section (2) is arranged close to an outlet of the gun barrel section (1), and powder enters the gun barrel section (1) through the connecting section (2);

the tangential direction of one side of the upper end of the connecting section (2) close to the outlet of the gun barrel section (1) forms an acute angle with the gun barrel section (1); the powder entering the barrel section (1) from the connecting section (2) will be introduced at an angle oblique to the barrel section (1); the powder collides with the wall surface of the gun barrel section (1), and the powder can deviate from the outlet of the gun barrel section (1) to splash due to the rebound force; the powder which is fully atomized due to collision and the coming airflow are opposite to each other, so that the powder is pushed back by the airflow to move towards the outlet direction of the gun barrel section (1), the moving speed of the powder is reduced, and the state of the powder is soft.

2. The powder tube in the spray gun according to claim 1, characterized in that the powder tube further comprises a handle section (3), the lower end of the connecting section (2) is communicated with the handle section (3), and the upper end of the connecting section (2) is communicated with the gun barrel section (1).

3. Powder tube in a spray gun according to claim 1, characterized in that the barrel section (1) is located radially at the upper end of the connecting section (2).

4. A powder tube in a spray gun according to claim 1, characterized in that said connecting section (2) is of an arc-shaped tubular construction, said connecting section (2) comprising a bent plate (2 a) and a cover plate (2 b), said cover plate (2 b) being mounted to the bent plate (2 a).

5. Powder tube in a spray gun according to claim 4, characterized in that the bent plate (2 a) is formed integrally with the barrel section (1) and that the bent plate (2 a) is formed integrally with the handle section (3).

6. A powder tube in a spray gun according to claim 4, characterized in that the top end of the cover plate (2 b) is attached to the end of the barrel section (1).

7. Powder tube in a spray gun according to claim 4, characterized in that the cover plate (2 b) is located on the side of the connecting section (2) remote from the barrel section (1), and the bent plate (2 a) is located on the side of the connecting section (2) close to the barrel section (1).

8. The powder tube in the spray gun according to claim 2, characterized in that the surface of the handle section (3) is sleeved with a sealing ring (4), and the handle section (3) is connected with the spray gun through the sealing ring (4).

9. Electrostatic powder spray gun, characterized in that it comprises a gun housing in which a powder tube is arranged in a spray gun according to any one of claims 1 to 7.

10. Electrostatic powder spray gun according to claim 9, characterized in that the connection section (2) is provided with a connection boss (5), said connection boss (5) being in mating connection with the gun housing.