阅读说明：本技术 一种静电粉末喷涂设备 (Electrostatic powder spraying equipment ) 是由 孟凡国 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种静电粉末喷涂设备,包括喷粉管道以及承载喷粉管道的载具,喷粉管道包括进料室、连接管、出料管、基座、电针,进料室的前端与连接管连通,连接管的前端与出料管连通,出料管的前端伸出载具；电针置于连接管内的轴心线位置,电针的尾端穿过进料室的后端壁与置于进料室后方的基座连接导通；连接管的内壁上设置有用以扰流的螺旋式的膛线板,使得从进料室进入的气流在连接管内能够围绕电针流动,并从出料管的前端口喷出载具。本发明基于管道设计螺旋式的扰流结构,干扰喷粉管道内的气流流向及行程,使粉末涂料围绕、撞击电针,提升粉末涂料与电针接触加电效果；喷粉管道可适用于多种类型的载具。(The invention discloses electrostatic powder spraying equipment which comprises a powder spraying pipeline and a carrier for bearing the powder spraying pipeline, wherein the powder spraying pipeline comprises a feeding chamber, a connecting pipe, a discharging pipe, a base and an electric needle; the electric needle is arranged at the position of the axial lead in the connecting pipe, and the tail end of the electric needle penetrates through the rear end wall of the feeding chamber to be connected and communicated with the base arranged behind the feeding chamber; the inner wall of the connecting pipe is provided with a spiral rifling plate for disturbing flow, so that air flow entering from the feeding chamber can flow around the electric needle in the connecting pipe, and the carrier is sprayed out from the front end port of the discharging pipe. According to the invention, a spiral turbulent flow structure is designed based on the pipeline, so that the flow direction and the stroke of air flow in the powder spraying pipeline are disturbed, the powder coating surrounds and impacts the electric needle, and the contact power-up effect of the powder coating and the electric needle is improved; the powder injection pipeline can be suitable for various types of carriers.)

1. The electrostatic powder spraying equipment is characterized by comprising a powder spraying pipeline and a carrier for bearing the powder spraying pipeline, wherein the powder spraying pipeline comprises a feeding chamber (1), a connecting pipe (2), a discharging pipe (3), a base (4) and an electric needle (5), the front end of the feeding chamber (1) is communicated with the connecting pipe (2), the front end of the connecting pipe (2) is communicated with the discharging pipe (3), and the front end of the discharging pipe (3) extends out of the carrier; the electric needle (5) is arranged at the axis position in the connecting pipe (2), and the tail end of the electric needle (5) penetrates through the rear end wall of the feeding chamber (1) to be connected and conducted with the base (4) arranged behind the feeding chamber (1); be provided with spiral rifling board (21) for the vortex on the inner wall of connecting pipe (2), make follow the air current that feed chamber (1) got into can center on in connecting pipe (2) electricity needle (5) flow, and follow the front end mouth blowout of discharging pipe (3) the carrier.

2. An electrostatic powder spray coating device according to claim 1, wherein the upper end of the feed chamber (1) is provided with a feed pipe (11), the feed pipe (11) being in communication with a powder supply pipe; an annular turbulence ring (12) is arranged on the inner wall of the front port of the feeding chamber (1), the turbulence ring (12) is of a streamline convex structure, and the gradient of one side, close to the connecting pipe (2), of the turbulence ring (12) is far larger than that of the other side of the turbulence ring (12); the highest point of the turbulent flow ring (12) is not in contact with the electric needle (5).

3. An electrostatic powder spraying apparatus according to claim 1, wherein a plurality of said rifling plates (21) extend from one end of said connecting pipe (2) all the way to the other end of said connecting pipe (2), a plurality of said rifling plates (21) being evenly distributed on the inner wall of said connecting pipe (2); the height of the rifling plate (21) is smaller than the distance between the electric needle (5) and the connecting pipe (2); two adjacent be provided with the slope of short section between the rifling board (21), the slope is followed the trend setting of rifling board (21), the domatic flow direction orientation along the air current of slope the electricity needle (5) slope sets up for the air current in connecting pipe (2) can collide to when flowing electricity needle (5).

4. The electrostatic powder spraying equipment according to claim 1, wherein a flow guide frame (6) is arranged in one end of the discharging pipe (3) butted with the connecting pipe (2), the flow guide frame (6) is arranged in a radial direction, the flow guide frame (6) comprises a central cone (61) positioned on the axis of the connecting pipe (2), and a plurality of flow guide plates (62) arranged around the central cone (61), the axis of the central cone (61) is collinear with the axis of the connecting pipe (2), both ends of the central cone (61) are in a conical structure, and the middle of the central cone (61) is in a cylindrical structure; it is a plurality of the gathering end of guide plate (62) rigid coupling extremely in proper order on the cylinder structure of central awl (61), it is a plurality of the end of dispersing of guide plate (62) in proper order with the inner wall rigid coupling of discharging pipe (3), the cross-section of guide plate (62) is the water droplet shape, the big head side of guide plate (62) is just right connecting pipe (2).

5. The electrostatic powder spraying equipment as claimed in claim 1, wherein a clamping cavity is formed in one side, opposite to the feeding chamber (1), of the base (4), sliding blocks (41) are symmetrically arranged on the inner wall of the clamping cavity, an elastic contact (42) is arranged at the bottom of the clamping cavity, a spring (43) is sleeved between the elastic contact (42) and the inner wall of the clamping cavity, the shortest expansion amount of the spring (43) is smaller than the height of the elastic contact (42), a wiring board (45) is arranged on the outer side wall of the base (4), and the elastic contact (42) is electrically connected with a wiring terminal of the wiring board (45).

6. An electrostatic powder spray coating device according to claim 5, wherein said base (4) is provided with a mounting ring (44) on a side wall where a port of said snap chamber is located, said mounting ring (44) being arranged around said port of said snap chamber; the side wall of the rear end of the feeding chamber (1), which corresponds to the mounting ring (44), is provided with a positioning ring (14), so that the inner cavity of the positioning ring (14) is communicated with the inner cavity of the feeding chamber (1), and the rear end of the positioning ring (14) is in butt joint with the mounting ring (44), so that the buckling cavity is directly communicated with the feeding chamber (1); the inner diameter of the positioning ring (14) is the same as that of the buckling cavity.

7. The electrostatic powder spraying equipment according to claim 6, wherein a clamping channel (51) is arranged at the tail end of the electric needle (5), the clamping channel (51) comprises a butt joint channel (511) formed along the axial direction of the electric needle (5) and a clamping stagnation channel (512) formed along the circumferential direction of the electric needle (5), the butt joint channel (511) is formed from the bottom of the electric needle (5) upwards, and the starting end of the clamping stagnation channel (512) is communicated with the tail end of the butt joint channel (511); the pair of channels (511) corresponds to the sliding block (41), so that the tail end of the electric needle (5) can be inserted into the buckling cavity from the feeding chamber (1) along the positioning ring (14) and is in contact conduction with the elastic contact (42) after the spring (43) is compressed; and rotating the electric needle (5) to enable the sliding block (41) to slide into the clamping stagnation channel (512), so that the spring (43) is always in a compressed state.

8. An electrostatic powder coating device according to claim 1, wherein said carrier is a spray gun (7), said spray gun (7) comprising a gun holder (71), a gun body (72), a trigger (73), said powder spray duct being built into said gun body (72); the front end of the gun body (72) is a detachable end (721), the rear end of the gun body (72) is a fixed end, and a rear interface of the detachable end (721) is connected with the fixed end; the discharge pipe (3) is arranged in the center of the disassembly end (721), a horn nozzle (32) is arranged at the front end of the discharge pipe (3), a second fixed ring (31) is arranged on the outer ring wall of the rear end of the discharge pipe (3), and the horn nozzle (32) extends out of the front muzzle of the disassembly end (721); the feeding chamber (1) is arranged in the fixed end, a first fixed ring (11) is arranged on the outer ring wall of the front end of the feeding chamber (1), and the connecting pipe (2) is fixedly positioned in the gun body (72) through the first fixed ring (11) and the second fixed ring (31).

9. An electrostatic powder coating device according to claim 8, wherein said inlet chamber (1) communicates with a powder delivery pipe (74), said powder delivery pipe (74) being provided with a shut-off valve (8), said shut-off valve (8) being opened by activating said trigger (73), said shut-off valve (8) being closed by resetting said trigger (73).

10. An electrostatic powder coating device according to claim 8, wherein a switch (9) is arranged on the gun body (72), said switch (9) being adapted to switch on/off the current to the base (4).

Technical Field

The invention relates to the technical field of electrostatic spraying, in particular to electrostatic powder spraying equipment.

Background

The electrostatic powder spraying gun is a key spraying device in powder spraying equipment, and the main working principle is that air around the gun head is ionized by a high-voltage electrostatic generator to generate a negative electrostatic magnetic field, so that powder is adsorbed on a workpiece to be coated with a positive electrode.

An electrostatic powder spray gun generally comprises a high-voltage generator, a gun body, a powder conveying system, a control system and the like; present powder gun generally all installs the electric needle in powder transfer passage, and powder transfer passage connects and supplies the powder jar, supplies the powder jar to enter into the powder transfer passage in under this high velocity air's the drive and take highly compressed electric needle contact to make the powder in the powder transfer passage static, the powder of conveniently deriving adsorbs to taking anodal treating to scribble on the work piece, and the electric needle tip in the powder transfer passage need connect high voltage power supply.

The electric needle in the traditional powder gun is directly and fixedly arranged in the powder conveying channel, and the end part of the electric needle is fixedly connected with a high-voltage power supply through a lead, so that the electric needle is not convenient to disassemble and replace; the contact power-up effect of the powder and the electric needle in the process of running along with the air flow is not ideal, and the power-up effect is poor.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides electrostatic powder spraying equipment, which is based on a spiral turbulent flow structure designed on a pipeline, so that the flow direction and the stroke of air flow in a powder spraying pipeline are disturbed, powder coating surrounds and impacts an electric needle, and the contact power-up effect of the powder coating and the electric needle is improved; the electric needle is installed in a buckling manner, so that the electric needle is convenient to disassemble, clean and replace; the powder injection pipeline can be suitable for various types of carriers.

The technical scheme for solving the problems is that the invention provides electrostatic powder spraying equipment which comprises a powder spraying pipeline and a carrier for bearing the powder spraying pipeline, wherein the powder spraying pipeline comprises a feeding chamber, a connecting pipe, a discharging pipe, a base and an electric needle, the front end of the feeding chamber is communicated with the connecting pipe, the front end of the connecting pipe is communicated with the discharging pipe, and the front end of the discharging pipe extends out of the carrier; the electric needle is arranged at the position of an axial lead in the connecting pipe, and the tail end of the electric needle penetrates through the rear end wall of the feeding chamber to be connected and communicated with the base arranged behind the feeding chamber; and a spiral rifling plate for disturbing flow is arranged on the inner wall of the connecting pipe, so that the air flow entering from the feeding chamber can flow around the electric needle in the connecting pipe, and the carrier is ejected out from the front port of the discharging pipe.

Further, a feeding pipe is arranged at the upper end of the feeding chamber and is communicated with the powder supply pipe; an annular turbulence ring is arranged on the inner wall of the front port of the feeding chamber, the turbulence ring is of a streamline convex structure, and the gradient of one side of the turbulence ring, which is close to the connecting pipe, is far larger than that of the other side of the turbulence ring; the highest point of the turbulent flow ring is not in contact with the electric needle.

Furthermore, the plurality of rifling plates extend from one end of the connecting pipe to the other end of the connecting pipe, and the plurality of rifling plates are uniformly distributed on the inner wall of the connecting pipe; the height of the rifling plate is smaller than the distance between the electric needle and the connecting pipe; the utility model discloses a novel connecting tube, including two adjacent thorax boards be provided with the slope of short section between the thorax board, the slope is followed the trend setting of thorax board, the domatic flow direction orientation of air current of following of slope the electricity needle slope sets up for the air current in the connecting tube can collide when flowing to the electricity needle.

Furthermore, a flow guide frame is arranged in one end, butted with the connecting pipe, of the discharging pipe, and is arranged in the radial direction, the flow guide frame comprises a central cone and a plurality of flow guide plates, the central cone is located on the axis position of the connecting pipe, the flow guide plates are arranged around the central cone, the axis of the central cone is collinear with the axis of the connecting pipe, two ends of the central cone are of conical structures, and the middle of the central cone is of a cylindrical structure; it is a plurality of the gathering end of guide plate rigid coupling in proper order extremely the cylinder of center awl is structural, and is a plurality of the end of dispersing of guide plate in proper order with the inner wall rigid coupling of discharging pipe, the cross-section of guide plate is the water droplet shape, the big head side of guide plate is all just right the connecting pipe.

Furthermore, the base is just right the buckle chamber has been seted up to one side of feed chamber, the symmetry is provided with the slider on the inner wall in buckle chamber, the bottom in buckle chamber is provided with elastic contact, elastic contact with the cover is equipped with the spring between the inner wall in buckle chamber, the shortest flexible volume of spring is less than elastic contact's height, be provided with the wiring board on the outside lateral wall of base, elastic contact with the binding post electricity of wiring board is connected.

Further, a mounting ring is arranged on the side wall of the base where the port of the buckle cavity is located, and the mounting ring is arranged around the port of the buckle cavity; the side wall of the rear end of the feeding chamber, which corresponds to the mounting ring, is provided with a positioning ring, so that the inner cavity of the positioning ring is communicated with the inner cavity of the feeding chamber, and the rear end of the positioning ring is in butt joint with the mounting ring, so that the clamping cavity is directly communicated with the feeding chamber; the inner diameter of the positioning ring is the same as that of the buckling cavity.

Furthermore, a clamping channel is arranged at the tail end of the electric needle, the clamping channel comprises a butt-joint channel arranged along the axial direction of the electric needle and a clamping stagnation channel arranged along the circumferential direction of the electric needle, the butt-joint channel is upwards arranged from the bottom of the electric needle, and the starting end of the clamping stagnation channel is communicated with the tail end of the butt-joint channel; the butt joint channel corresponds to the sliding block, so that the tail end of the electric needle can be inserted into the clamping cavity from the feeding chamber along the positioning ring and is in contact conduction with the elastic contact after the spring is compressed; and rotating the electric needle to enable the sliding block to slide into the clamping stagnation channel, so that the spring is always in a compressed state.

Furthermore, the carrier is a spray gun, the spray gun comprises a gun handle, a gun body and a trigger, and the powder spraying pipeline is arranged in the gun body; the front end of the gun body is a detachable end, the rear end of the gun body is a fixed end, and a rear interface of the detachable end is connected with the fixed end; the discharge pipe is arranged in the center of the disassembly end, the front end of the discharge pipe is provided with a horn nozzle, the outer ring wall of the rear end of the discharge pipe is provided with a second fixed ring, and the horn nozzle extends out of the front gun mouth of the disassembly end; the feeding chamber is arranged in the fixed end, a first fixed ring is arranged on the outer ring wall of the front end of the feeding chamber, and the connecting pipe is fixedly positioned in the gun body through the first fixed ring and the second fixed ring.

Furthermore, the feeding chamber is communicated with a powder conveying pipe, a stop valve is arranged on the powder conveying pipe, the trigger is pulled to open the stop valve, and the trigger is reset to close the stop valve.

Furthermore, the stop valve is an electromagnetic valve and is in a normally closed state when the trigger is pulled. The magnetic force of the electromagnetic valve disappears, the stop valve is opened, and the powder conveying pipe is directly communicated with the feeding chamber; when the trigger is released, the magnetic force of the electromagnetic valve is restored, the stop valve is closed, and the powder conveying pipe is disconnected with the feeding chamber.

Further, a switch is arranged on the gun body and used for conducting/breaking current to the base.

The invention has the beneficial effects that:

the invention relates to electrostatic powder spraying equipment, wherein a powder spraying pipeline is internally provided with a plurality of turbulence structures to disturb the flow direction and the stroke of airflow carrying powder coating, so that the powder coating can be fully contacted and electrified with an electric needle.

When designing spraying equipment based on the powder spraying pipeline, its comparatively typical carrier structure can be designed to the spray gun, and the front end of spray gun can be dismantled, can decompose the split with the partial subassembly of powder spraying pipeline, and is specific, and the discharging pipe can be held fixedly with the dismantlement of spray gun, and the connecting pipe is independent assembly part, and when the dismantlement end was held fixedly with the butt joint of spray gun, butt joint installation connecting pipe can.

The long powder spraying pipeline is covered by the length of the electric needle, the tail end of the electric needle is installed with the power-on base in a buckle mode, the contact is conducted, and the electric needle is convenient to detach. The front end of the electric needle is arranged in the connecting pipe, and after the disassembly end finishes disassembly, the connecting pipe is taken out, so that the electric needle can be directly disassembled/assembled.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.

FIG. 1 is an exploded view of a powder spray conduit of an electrostatic powder spray coating apparatus according to an embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of a connection pipe of an electrostatic powder coating apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the distribution of rifling plates of a connecting pipe of an electrostatic powder spraying device according to an embodiment of the present invention;

FIG. 4 is a front view of a diversion frame of an electrostatic powder spray coating apparatus according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a deflector of an electrostatic powder spray apparatus according to an embodiment of the present invention;

FIG. 6 is a block diagram of a needle of an electrostatic powder coating apparatus according to an embodiment of the present invention;

fig. 7 is a structural diagram of a carrier according to an embodiment of the present invention;

FIG. 8 is an enlarged view of the structure of FIG. 7 at A in accordance with an embodiment of the present invention;

FIG. 9 is an enlarged view of the structure at B in FIG. 7 according to an embodiment of the present invention;

fig. 10 is a schematic flow guide diagram of a flow guide frame of an electrostatic powder spraying apparatus according to an embodiment of the present invention.

In the figure: 1. a feed chamber; 2. a connecting pipe; 3. a discharge pipe; 4. a base; 5. an electric needle; 6. a flow guiding frame; 7. a spray gun; 8. a stop valve; 9. a switch; 11. a first stationary ring; 12. a flow disturbing ring; 13. a feed pipe; 14. a positioning ring; 21. an boresight plate; 31. a second stationary ring; 32. a horn nozzle; 41. a slider; 42. an elastic contact; 43. a spring; 44. a mounting ring; 45. a wiring board; 51. blocking a channel; 61. a central cone; 62. a baffle; 71. a gun handle; 72. a gun body; 73. a trigger; 74. a powder conveying pipe; 75. adding an electric wire; 76. a wire; 511. butt joint channels; 512. blocking the channel; 721. and (6) disassembling the end.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In order to solve the above problems, the present invention provides an electrostatic powder spraying apparatus for electrically spraying an electrostatic powder coating, please refer to fig. 1-10, which mainly includes a powder spraying pipeline and a carrier for carrying the powder spraying pipeline, wherein the powder spraying pipeline includes a feeding chamber 1, a connecting pipe 2, a discharging pipe 3, a base 4, and an electric needle 5, the front end of the feeding chamber 1 is communicated with the connecting pipe 2, the front end of the connecting pipe 2 is communicated with the discharging pipe 3, and the front end of the discharging pipe 3 extends out of the carrier; the electric needle 5 is arranged at the position of the axial lead in the connecting pipe 2, and the tail end of the electric needle 5 penetrates through the rear end wall of the feeding chamber 1 to be connected and communicated with the base 4 arranged behind the feeding chamber 1; a spiral type rifling plate 21 for turbulent flow is arranged on the inner wall of the connecting pipe 2, so that air flow entering from the feeding chamber 1 can flow around the electric needle 5 in the connecting pipe 2, and a carrier is sprayed out from the front end port of the discharging pipe 3.

The spraying equipment of the invention mainly comprises an internal pipeline design and an external carrier, and the power source of powder spraying can be provided by high-pressure airflow. The powder spraying pipeline is installed in a carrier and is used for spraying electrostatic powder, and the basic structure of the powder spraying pipeline comprises a feeding chamber 1, a connecting pipe 2, a discharging pipe 3, a base 4 and an electric needle 5; the carrier has various forms, and the more classical usage type is a spray gun type structure, so the embodiment of the present invention is described by taking the spray gun type structure as an example.

It should be noted that the functional requirements of the electrical needle 5 of the powder spraying pipeline and the feeding chamber 1 can be optimally designed and adjusted according to the actual carrier. Such as the feeding wire 75 of the electric needle 5 and the powder conveying pipe 74 of the feeding chamber 1. Further, control switches may be provided on the charging wire 75 and the powder feeding tube 74, and may be manually or automatically controlled by the attachment structure of the carrier.

In the embodiment of the present invention, the main structure of the powder spraying duct includes an electric needle 5, a base 4 for supplying a power-on voltage and a mounting structure, and a duct structure for powder running. The pipeline structure is composed of a feeding chamber 1, a connecting pipe 2 and a discharging pipe 3, and an electric needle 5 is arranged in the pipeline structure and is communicated with a wiring terminal of the base 4.

Specifically, the assembly method of the pipeline structure is as follows: a feeding pipe 13 is arranged on the top plate structure at the upper end of the feeding chamber 1 and is communicated with a powder supply pipe; the front end of the feeding chamber 1 is provided with a front port which is used for being in butt joint communication with the rear port of the connecting pipe 2; the front end of the connecting pipe 2 is in butt joint communication with the rear end of the discharging pipe 3, and the front end of the discharging pipe 3 extends out of the carrier, so that the powder coating entering the pipeline structure from the feeding pipe 13 can be sprayed out of the carrier from the front end of the discharging pipe 3.

Most of structure of electric needle 5 is with the pipeline structure in, further, electric needle 5 is the longest at the structural length in connecting pipe 2 for powder coating can fully contact with electric needle 5 in connecting pipe 2, the completion adds power.

In the embodiment of the invention, the axial lead of the electric needle 5 is collinear with the axial lead of the pipeline structure, and the tail end of the electric needle 5 penetrates through the rear end wall of the feeding chamber 1 and is installed, fixed and communicated with the base 4 arranged behind the feeding chamber 1. The base 4 is internally provided with an elastic contact 42, and the rear end surface of the electric needle 5 is contacted with the elastic contact 42 to complete conduction.

Based on the installation requirement of the electric needle 5, a positioning ring 14 can be arranged on the rear end side wall of the feeding chamber 1, and the inner ring diameter of the positioning ring 14 can be similar to or the same as the diameter of the electric needle 5, so that after the electric needle 5 is inserted into the positioning ring 14, the positioning ring 14 can completely seal the opening on the rear end side wall of the feeding chamber 1, the sealing effect is maintained, and no paint leakage is generated. Meanwhile, a clamping cavity is arranged on the side wall of the base 4, which faces the feeding chamber 1, and can be used for clamping the tail end of the electric needle 5 in a butt joint mode at the position of the positioning ring 14. The inside diameter of the snap cavity is the same as the inside diameter of the retaining ring 14.

Further, in order to fix the installation position of the electric needle 5 and maintain the tightness of the feeding chamber 1, the side wall where the buckle cavity is located can be provided with the installation ring 44, the installation ring 44 is coaxially arranged around the port of the buckle cavity, correspondingly, the positioning ring 14 can extend backwards to form a butt joint structure, so that the rear end of the positioning ring 14 can be inserted into the installation ring 44, threads can be arranged on the inner wall of the installation ring 44 and the outer wall of the rear end of the positioning ring 14, the thread is fixedly connected, the installation relation between the base 4 and the feeding chamber 1 is stabilized, the buckle cavity and the feeding chamber 1 are in a directly communicated state, the rear end of the electric needle 5 can be directly inserted conveniently, and secondary alignment is not needed.

Set up elastic contact 42 on the diapire of the buckle chamber of base 4, elastic contact 42 then is connected with the outside wiring board 45 of base 4 and is switched on, and the binding post on wiring board 45 is used for being connected with plus electric wire 75 and switches on. The elastic contact 42 specifically includes a fixed base and an elastic plate, the elastic plate is fixed on the fixed base, and the fixed base and the elastic plate are good electrical conductors.

A spring 43 is sleeved between the fixed base body and the inner ring wall of the buckle cavity, the shortest expansion amount of the spring 43 is smaller than the overall height of the elastic contact 42, and the normal expansion amount of the spring 43 is larger than the overall height of the elastic contact 42. When the tail end of the electric needle 5 is contacted and conducted with the elastic contact 42, the spring 43 is always in a compressed state, and the elastic effect can be clearly sensed during disassembly/assembly, so that the indirect judgment of the assembly effect is facilitated.

The inner wall of the buckling cavity is fixedly provided with two sliding blocks 41, the two sliding blocks 41 can be symmetrically arranged, the tail end of the electric needle 5 is correspondingly provided with a clamping channel 51, the clamping channel 51 comprises a butt-joint channel 511 arranged along the axial direction of the electric needle 5 and a clamping stagnation channel 512 arranged along the circumferential direction of the electric needle 5, the butt-joint channel 511 is upwards arranged from the bottom of the electric needle 5, and the starting end of the clamping stagnation channel 512 is communicated with the tail end of the butt-joint channel 511. The slider 41 is able to slide within the card way 51.

The butt-joint passage 511 is aligned with the slide block 41, so that the tail end of the electric needle 5 can extend into the bottom of the snap cavity to be in contact with the elastic contact 42. It will be appreciated that the spring 43 is compressed by the trailing end of the electrical pin 5 before it contacts the resilient contact 42, so that the spring 43 is in a compressed state and the force of the spring 43 on the electrical pin 5 is always directed out of the snap-fit cavity.

When the depth of the electric needle 5 extending into the fastening cavity reaches the maximum, i.e. the sliding block 41 slides to the end of the butt-joint channel 511, at this time, the electric needle 5 can be rotated, so that the sliding block 41 slides into the fastening channel 512, and the electric needle 5 is fastened and fixed in the fastening cavity by matching with the elastic force of the spring 43. The elasticity of the spring 43 can be used to enhance the fixing effect, and meanwhile, the elastic plate of the elastic contact 42 is always in a contact conduction state with the tail end of the electric needle 5, and the micro-size error between the slider 41 and the card channel 51 can be solved by the micro-deformation of the elastic plate.

In the embodiment of the invention, the electric needle 5 is inserted into the buckling cavity of the base 4 through the positioning ring 14 to complete fixation, most of the structure of the electric needle 5 is positioned in the pipeline structure, and the feeding pipe 13 of the feeding chamber 1 can be arranged right above the electric needle 5, so that the powder coating can be initially contacted and electrified with the electric needle 5 when entering the feeding chamber 1.

Be provided with annular vortex ring 12 on the inner wall of the front end mouth of feed chamber 1, vortex ring 12 is streamlined protruding structure, and its cross-section is nearly triangle-shaped, as shown in fig. 9, the slope that vortex ring 12 is close to one side of connecting pipe 2 is far greater than the slope of vortex ring 12 opposite side for the air current all is lifted when passing through vortex ring 12, and the powder coating that is wrapped up by the air current and is carried then can dash electric needle 5, increases the probability with electric needle 5 contact.

It will be appreciated that the highest point of the spoiler ring 12 is not in contact with the electrical needle 5. The annular turbulence ring 12 pushes the airflow to the electric needle 5 in the center of the pipeline, so that the contact probability and the contact effect of the powder coating and the electric needle 5 are increased.

The inner wall of the connecting pipe 2 is provided with a spiral type rifling plate 21, a plurality of the rifling plates 21 extend from one end of the connecting pipe 2 to the other end in a consistent mode, and the plurality of the rifling plates 21 are uniformly distributed on the inner wall, wherein five rifling plates 21 are arranged for example in the invention and are shown in the figure 3. The five rifling plates 21 are not crossed and are in parallel with each other. When the air current moves in the inner cavity of the connecting pipe 2, the stroke of the air current changes under the turbulent flow effect of the rifling plate 21 and is in a spiral state, and the center is the electric needle 5.

A short section of slope is provided between two adjacent rifling plates 21, and a plurality of slopes can be provided at equal intervals. The whole trend on slope is along the spiral trend setting of rifling board 21, and the domatic flow direction along the air current of slope sets up towards 5 slopes of electricity needle for the air current by the rifling board 21 vortex is promoted by the slope once more, and the direction of promotion is for being close to the direction of electricity needle 5, thereby pushes the powder that the air current wrapped up in and is held to electricity needle 5, and when powder and electricity needle 5 produced the striking contact, can accomplish and add the electric operation.

It will be appreciated that in the chamber in which the rifling plate 21 is located, the direction of flow of the air flow is substantially synchronised with the direction of the helix of the rifling plate 21, i.e. the slope of the ramp is directed obliquely towards the electrical needle 5.

It can be understood that the height of the rifling plate 21, the number of turns of the spiral, the number of short-segment slopes can be optimally adjusted according to the applicable powder, the air flow speed and the like, so as to achieve the optimal turbulent flow effect and achieve the high-efficiency contact electrification of the powder and the electric needle 5.

It can be understood that the height of the rifling plate 21 is smaller than the distance between the electric needle 5 and the connecting pipe 2, and the highest point of the slope of the short section can be flush with the rifling plate 21 and does not exceed the height of the rifling plate 21.

The air current is in the connecting pipe 2 after the vortex ring 12, promptly, continues to be carried out the vortex by rifling board 21, the slope of short section thereupon, and its interference effect is the direction that promotes the air current towards electric needle 5 and squints, increases the stroke of air current in connecting pipe 2 for the powder that is wrapped up in by the air current and is carried by the clamp can not directly be blown out and spouts the powder pipeline, but rather produces certain degree "disjointed" effect with the air current after being disturbed the vortex after, is wrapped up in by the air current again and is carried by the clamp and blow out and spout the powder pipeline.

It can be understood that when the flow direction of the powder is changed, the inertia generates a certain 'disjointing' effect, and the contact power-up probability and effect with the electric needle 5 can be increased.

In the embodiment of the invention, the airflow passing through the connecting pipe 2 has obvious flow characteristics and influences the uniformity of powder spraying, so that the flow guide frame 6 can be arranged on the inner wall of the rear end opening of the discharge pipe 3 and is used for interfering the mixed airflow, so that the flow characteristics of the powder wrapped by the airflow tend to be in a disordered state.

The flow guide frame 6 is radially arranged in the butt joint port of the discharge pipe 3 and the connecting pipe 2, and is preferably arranged at the rear end of the discharge pipe 3.

The flow guide frame 6 comprises a central cone 61 and a flow guide plate 62, wherein both ends of the central cone 61 are of conical structures, the middle part of the central cone 61 is of a cylindrical structure, and the whole flow guide frame is of a streamline cone and can effectively interfere the flow direction of air flow. The cross-section of the baffle 62 is drop-shaped as shown in fig. 5. The plurality of guide plates 62 are uniformly arranged around the central cone 61, the axial lead of the central cone 61 is collinear with the axial lead of the pipeline structure, the gathering ends of the plurality of guide plates 62 are sequentially and fixedly connected to the middle cylindrical structure of the central cone 61, the scattering ends of the plurality of guide plates 62 are sequentially and fixedly connected with the inner wall of the discharge pipe 3, and the water drop big end side ends of the guide plates 62 are opposite to the inner cavity space of the connecting pipe 2.

Referring to fig. 10, when the airflow disturbed by the turbulent flow structure in the connection pipe 2 flows through the flow guiding frame 6, the cross impact spiral flow characteristic of the airflow is disturbed, the turbulent flow inertia effect of the airflow in the connection pipe 2 is rapidly destroyed, and the airflow gradually returns to the flow effect of the normal airflow in the pipeline in the subsequent path of the discharge pipe 3, so that the uniformity of powder spraying is not affected.

In a specific example, when a gun type structure is used as a carrier of the powder spraying duct, the powder spraying duct is installed in the spray gun 7. The classic structure of the spray gun 7 comprises a gun handle 71, a gun body 72 and a trigger 73, wherein a powder spraying pipeline can be arranged in the gun body 72, and the gun body 72 can be installed and disassembled according to the structure of each component of the powder spraying pipeline.

Specifically, the front end of the gun body 72 may be configured as a detachable structure, forming a detachable end 721; the rear end of the gun body 72 is a fixed end, and the detachable end 721 can be screwed to the fixed end.

The discharging pipe 3 can be embedded into the central position of the dismounting end 721, the front end of the discharging pipe 3 can be provided with a horn nozzle 32, and the horn nozzle 32 should extend out of the front gun mouth of the dismounting end 721, so that the powder coating can be directly sprayed out from the horn nozzle 32.

The base 4 and the feeding chamber 1 are both fixedly mounted in the fixed end of the gun body 72, so that the positions of the base 4 and the feeding chamber 1 are determined, and the power feeding wire 75 and the powder conveying pipe 74 can be conveniently designed according to functional requirements.

The front end of the feeding chamber 1 can sink below the butt joint face of the fixed end and the detachable end 721, the rear end of the connecting pipe 2 can be detached into the fixed end and butt joint with the front end of the feeding chamber 1, and the front end of the connecting pipe 2 is butt joint with the rear end of the discharging pipe 3, so that the whole powder spraying pipeline can be assembled after the detachable end 721 and the fixed end are fixed in a threaded manner. .

Preferably, the first fixed ring 11 is arranged on the outer ring wall of the front end of the feeding chamber 1, and the second fixed ring 31 is arranged on the outer ring wall of the rear end of the discharging pipe 3, so that the two ends of the connecting pipe 2 are respectively inserted into the first fixed ring 11 and the second fixed ring 31, the fixed installation of the connecting pipe 2 is completed, meanwhile, a sealing effect can be formed, the integral sealing performance of the powder spraying pipeline is ensured, and no leakage is generated. The first and second fixing rings 11 and 31 may be arranged depending on the basic structure of the gun body 72. It can be understood that the connecting pipe 2 and the fixed ring may be installed in an interference manner, and the fixed ring may be a sealing rubber ring, a sealing sleeve, or the like.

Based on the gun-type construction, the trigger 73 can be used to control the opening and closing of the spray at one end of the spray gun 7, the supply of powder coating material being controlled by the supply device. The rear end of the body 72 of the spray gun 7 may be provided with a powder duct 74 in communication with the supply device, so that powder coating material can be transported into the feed chamber 1 via the powder duct 74. In order to control powder spraying at the 7 end of the spray gun, a micro stop valve 8 can be arranged on the powder conveying pipe 74, the stop valve 8 can be an electromagnetic valve, when the spray gun 7 is connected with a power supply, the stop valve 8 is in a normally closed state, and when the trigger 73 is pulled, the stop valve 8 is in an open state, so that powder coating can be sprayed; when the trigger 73 is reset, the shut-off valve 8 is closed and no powder coating can be applied.

The on/off of the solenoid valve is controlled by the on/off of the lead 76, and the control switch is the trigger 73. The wire 76 may extend to the gun handle 71 to be supplied with power from an external power source together with the power supply line 75. further, a dry battery may be provided in the gun handle 71 of the spray gun 7 to supply power to the solenoid valve, and the power supply line 75 may be independently supplied with power from an external power source.

Depending on the gun body 72, the power supply line 75 can be controlled to be turned on or off, and a switch 9 can be provided on the gun body 72 to control the current flowing to the base 4.

Further, the detachable end 721 should be a cylindrical structure to ensure that the screw-type fixing connection mode does not have a large influence on the butt joint assembly of the powder spraying pipeline.

Further, when the electric needle 5 needs to be replaced, the detachable end 721 can be detached, and then the connecting pipe 2 is taken out, most of the structure of the electric needle 5 is exposed outside, and the electric needle 5 can be directly operated, so that the operations of detachment, replacement, cleaning and the like are completed.

The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the specific embodiments of the invention be limited to these descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.