Electric arc spray gun

Abstract

The utility model relates to an electric arc spray gun which comprises a spray gun body, a nozzle assembly, a compressed air pipe and two sets of wire guide pipes. The nozzle assembly comprises an inner atomizing nozzle and an outer atomizing nozzle, the inner atomizing nozzle is arranged at the front end of the spray gun body, the outer atomizing nozzle is arranged on the inner atomizing nozzle in a sleeving mode, a nozzle opening of the outer atomizing nozzle is close to a nozzle opening of the inner atomizing nozzle, a flow dividing cavity is formed between the outer atomizing nozzle and the inner atomizing nozzle, and the flow dividing cavity is communicated with the inner atomizing nozzle. A conical ventilation channel is formed in the inner atomizing nozzle, a plurality of flow dividing air channels are formed in the inner wall of the conical ventilation channel, and the flow dividing ventilation holes are communicated with the flow dividing cavity. According to the arc spray gun, the flow dividing cavity is formed between the outer atomizing nozzle and the inner atomizing nozzle, part of airflow enters the flow dividing cavity from the flow dividing air channel and converges between the spraying opening of the outer atomizing nozzle and the spraying opening of the inner atomizing nozzle, deposition of spraying particles at the spraying opening of the outer atomizing nozzle can be effectively avoided, and the atomizing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spraying equipment, in particular to an arc spray gun. Background Art

[0002] Arc spraying is a technology that uses two metal wires to be sprayed as consumable electrodes, and uses a large current to generate a high-temperature arc between the two continuously fed spray wires. Under the action of the arc heat, the spray wires are melted into molten droplets, and then a high-speed airflow passes through the arc and the molten droplets to atomize them, and then sprays them onto the surface of the substrate (parts) at a certain speed to form a continuous coating.

[0003] The arc spray gun is the core equipment of the arc spray system. However, after working for a long time, the existing arc spray gun is prone to incomplete atomization, uneven spray coating and irregular spray spots. Utility Model Content

[0004] Based on this, the purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and provide an arc spray gun.

[0005] The utility model provides an arc spray gun, comprising:

[0006] The spray gun body, nozzle assembly, compressed air pipe and two sets of wire guide tubes;

[0007] The nozzle assembly comprises an inner atomizing nozzle and an outer atomizing nozzle, wherein the inner atomizing nozzle is arranged at the front end of the spray gun body, the outer atomizing nozzle is sleeved on the inner atomizing nozzle, the nozzle of the outer atomizing nozzle is close to the nozzle of the inner atomizing nozzle, a flow dividing chamber is formed between the outer atomizing nozzle and the inner atomizing nozzle, a conical air passage is formed inside the inner atomizing nozzle, a plurality of flow dividing air passages are opened on the inner wall of the conical air passage, and the flow dividing air passages are connected to the flow dividing air passages;

[0008] The compressed air pipe is connected to an external air source device through an internal ventilation pipeline of the spray gun body. The wire guide tube sleeve is provided with a conductive member. One end of the wire guide tube extends into the conical air passage. The axis lines of the two groups of wire guide tubes intersect on the axis line of the compressed air pipe.

[0009] Furthermore, the nozzle of the outer atomizing nozzle is recessed and extends inwardly, and an annular inclined flow guide curved surface is formed around the nozzle of the outer atomizing nozzle.

[0010] Furthermore, a partition is provided between the inner atomizing nozzle and the outer atomizing nozzle, the partition is provided with a diversion air hole corresponding to the diversion airway, a partition opening is provided at the center of the partition, the partition opening is provided close to the nozzle of the inner atomizing nozzle and the nozzle of the outer atomizing nozzle, and forms an annular ventilation cavity.

[0011] Furthermore, the spray gun body is provided with a plurality of tightening bolts, and the spray gun body is provided with a plurality of through holes around the wire guide tube, and the tightening bolts pass through the through holes to tighten the wire guide tube.

[0012] Furthermore, it also includes a wire feeding assembly and a driver, the wire feeding assembly includes two groups of active wire feeding wheels and two groups of driven wire feeding wheels, the active wire feeding wheels and the driven wire feeding wheels are correspondingly arranged on the left and right sides of the other end port of the wire guide tube, the output end of the driver is provided with a rotating part, and the active wire feeding wheel is arranged on the rotating part.

[0013] Furthermore, the wire feeding assembly further comprises a wire pressing block and an adjusting member, wherein the wire pressing block is detachably embedded in the spray gun body, the driven wire feeding wheel is rotatably arranged on the wire pressing block, and the adjusting member is penetrated through the spray gun body;

[0014] The adjusting member includes an adjusting rod, a spring and a positioning block. The spring is sleeved on the adjusting rod body. One end of the spring is connected to the adjusting rod, and the other end of the spring is connected to the positioning block. A pressing portion is provided at one end of the adjusting rod away from the positioning block, and the pressing portion abuts against the wire pressing block.

[0015] Furthermore, the pressing part includes a mounting block and a pressing screw, the mounting block is arranged at one end of the adjusting rod away from the positioning block, the pressing screw is arranged on the mounting block along the moving direction of the adjusting rod, and the pressing screw abuts against the thread pressing block.

[0016] Compared with the prior art, the arc spray gun of the utility model has the following beneficial effects:

[0017] 1. An arc spray gun of the utility model is provided with a nozzle assembly, wherein a diversion chamber is formed between an outer atomizing nozzle and an inner atomizing nozzle, part of the airflow enters the diversion chamber from the diversion airway and converges between the nozzle of the outer atomizing nozzle and the nozzle of the inner atomizing nozzle, which can effectively avoid the deposition of spray particles at the nozzle of the outer atomizing nozzle and improve the atomization effect.

[0018] 2. An arc spray gun of the utility model is provided with a partition between the inner atomizing nozzle and the outer atomizing nozzle, and an annular ventilation cavity is formed between the partition and the inner atomizing nozzle and the outer atomizing nozzle. The airflow forms an annular air curtain in the annular ventilation cavity, so that the molten droplets are atomized more fully, the spots sprayed from the nozzle remain regular, and the sprayed coating remains stable and uniform.

[0019] 3. An arc spray gun of the utility model is further provided with a wire pressing block and an adjusting member in the wire feeding assembly, and the adjusting member is used to adjust the distance between the driven wire feeding wheel and the active wire feeding wheel to prevent the spray wire from being blocked during the feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an arc spray gun of the utility model;

[0021] Figure 2 for Figure 1 A partial structural cross-sectional view of an arc spray gun;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of a nozzle assembly;

[0023] Figure 4 for Figure 3 A structural cross-sectional view of a nozzle assembly;

[0024] Figure 5 for Figure 1 Schematic diagram of the internal structure of the spray gun body;

[0025] In the figure: 10, spray gun body; 11, wire guide tube; 12, tightening bolt; 13, compressed air pipe; 20, nozzle assembly; 21, inner atomizing nozzle; 211, diverter air channel; 22, partition; 221, diverter air hole; 222, partition; 23, outer atomizing nozzle; 231, guide surface; 24, diverter chamber; 25, annular ventilation chamber; 30, wire feeding assembly; 31, active wire feeding wheel; 32, rotating part; 33, wire pressing block; 34, driven wire feeding wheel; 35, positioning block; 36, spring; 37, adjusting rod; 38, mounting block; 39, pressing screw; 40, driver. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0029] In view of the technical problems in the background technology, the utility model provides an arc spray gun, such as Figures 1 to 4 As shown, in one embodiment, the arc spray gun includes a spray gun body 10, a nozzle assembly 20, a compressed air pipe 13 and two sets of wire guide tubes 11. The nozzle assembly 20 includes an inner atomizing nozzle 21 and an outer atomizing nozzle 23, the inner atomizing nozzle 21 is fixed to the front end of the spray gun body 10, the outer atomizing nozzle 23 is sleeved on the inner atomizing nozzle 21, the nozzle of the outer atomizing nozzle 23 is close to the nozzle of the inner atomizing nozzle 21, a diversion chamber 24 is formed between the outer atomizing nozzle 23 and the inner atomizing nozzle 21, a conical airway is formed inside the inner atomizing nozzle 21, and a plurality of diversion airways 211 are opened on the inner wall of the conical airway, and the diversion airway 211 is connected to the diversion chamber 24.

[0030] The compressed air pipe 13 is connected to the external air source equipment through the internal ventilation pipeline of the spray gun body 10. The wire guide tube 11 is provided with a conductive member. One end of the wire guide tube 11 extends into the conical air passage. The axis lines of the two groups of wire guide tubes 11 intersect on the axis line of the compressed air pipe 13.

[0031] During operation, part of the airflow enters the diversion chamber 24 from the diversion airway 211 and converges between the nozzles of the outer atomizing nozzle 23 and the inner atomizing nozzle 21, which can effectively avoid the deposition of spray particles at the nozzle of the outer atomizing nozzle 23 and improve the atomization effect.

[0032] Preferably, the nozzle of the external atomizing nozzle 23 is recessed and extends inward, and an annular inclined guide surface 231 is formed around the nozzle of the external atomizing nozzle 23. After part of the airflow enters the diversion chamber 24, it is guided by the guide surface 231 and accelerated to converge at the nozzle, thereby further improving the atomization effect.

[0033] like Figure 4 As shown, more preferably, a partition 22 is provided between the inner atomizing nozzle 21 and the outer atomizing nozzle 23, the partition 22 is provided with a diversion air hole 221 corresponding to the diversion air channel 211, and a partition opening 222 is provided at the center of the partition 22, and the partition opening 222 is provided close to the nozzle of the inner atomizing nozzle 21 and the nozzle of the outer atomizing nozzle 23, and forms an annular ventilation cavity 25. Part of the airflow enters the annular ventilation cavity 25 from the gap, and an annular air curtain is formed in the annular ventilation cavity 25, which then affects the atomization process at the nozzle, so that the molten droplet is atomized more fully, the spots sprayed from the nozzle remain regular, and the sprayed coating remains stable and uniform.

[0034] In one embodiment, the spray gun body 10 is provided with a plurality of tightening bolts 12. The spray gun body 10 has a plurality of through holes around the wire guide tube 11. The tightening bolts 12 pass through the through holes to tighten the wire guide tube 11, ensuring that the feeding of the spray wire is orderly and stable, and the feeding direction is controllable and adjustable.

[0035] like Figure 5As shown, in one embodiment, the arc spray gun further includes a wire feeding assembly 30 and a driver 40. The wire feeding assembly 30 includes two sets of active wire feeding wheels 31 and two sets of driven wire feeding wheels 34. The active wire feeding wheels 31 and the driven wire feeding wheels 34 are correspondingly arranged on the left and right sides of the other end port of the wire guide tube 11. The output end of the driver 40 is provided with a rotating member 32, and the active wire feeding wheel 31 is arranged on the rotating member 32. The spray wire passes between the active wire feeding wheel 31 and the driven wire feeding wheel 34. The driver 40 drives the active wire feeding wheel 31 to rotate, and then drives the spray wire to enter the wire guide tube 11. The driven wire feeding wheel 34 provides a positioning and guiding function to realize automatic control of the feeding of the spray wire.

[0036] Preferably, the wire feeding assembly 30 also includes a wire pressing block 33 and an adjusting member. The wire pressing block 33 is detachably embedded in the spray gun body 10, and the driven wire feeding wheel 34 is rotatably set on the wire pressing block 33. The adjusting member is passed through the spray gun body 10, and the adjusting member is used to adjust the distance between the driven wire feeding wheel 34 and the active wire feeding wheel 31.

[0037] Specifically, the adjusting member includes an adjusting rod 37, a spring 36 and a positioning block 35. The spring 36 is sleeved on the rod of the adjusting rod 37. One end of the spring 36 is connected to the adjusting rod 37, and the other end of the spring 36 is connected to the positioning block 35. The end of the adjusting rod 37 away from the positioning block 35 is provided with a pressing portion, and the pressing portion abuts against the wire pressing block 33. When the deformed part of the spray wire enters between the active wire feeding wheel 31 and the driven wire feeding wheel 34, the wire pressing block 33 is pushed open due to the elastic effect of the spring 36 to prevent the spray wire from being blocked during the feeding process. When the spray wire resumes normal feeding, the wire pressing block 33 moves inward and presses the spray wire again.

[0038] In a preferred embodiment, the pressing part includes a mounting block 38 and a pressing screw 39. The mounting block 38 is arranged at one end of the adjusting rod 37 away from the positioning block 35. The pressing screw 39 is arranged on the mounting block 38 along the moving direction of the adjusting rod 37, and the pressing screw 39 abuts against the wire pressing block 33. The telescopic force of the spring 36 acts stably on the wire pressing block 33 through the pressing screw 39, and the overall structure is simple and compact.

[0039] Compared with the prior art, the arc spray gun of the embodiment of the utility model has the following beneficial effects:

[0040] 1. An arc spray gun according to an embodiment of the utility model is provided with a nozzle assembly, wherein a diversion chamber is formed between an outer atomizing nozzle and an inner atomizing nozzle, part of the airflow enters the diversion chamber from the diversion airway and converges between the nozzle of the outer atomizing nozzle and the nozzle of the inner atomizing nozzle, which can effectively avoid the deposition of spray particles at the nozzle of the outer atomizing nozzle and improve the atomization effect.

[0041] 2. An arc spray gun in an embodiment of the utility model is provided with a partition between the inner atomizing nozzle and the outer atomizing nozzle, and an annular ventilation cavity is formed between the partition and the inner atomizing nozzle and the outer atomizing nozzle. The airflow forms an annular air curtain in the annular ventilation cavity, so that the molten droplets are atomized more fully, the spots sprayed from the nozzle remain regular, and the sprayed coating remains stable and uniform.

[0042] 3. An arc spray gun according to an embodiment of the utility model is further provided with a wire pressing block and an adjusting member in the wire feeding assembly, and the adjusting member is used to adjust the distance between the driven wire feeding wheel and the active wire feeding wheel to prevent the spray wire from being blocked during the feeding process.

Claims

1. An arc spray gun, characterized in that: include: The spray gun body, nozzle assembly, compressed air pipe and two sets of wire guide tubes; The nozzle assembly comprises an inner atomizing nozzle and an outer atomizing nozzle, wherein the inner atomizing nozzle is arranged at the front end of the spray gun body, the outer atomizing nozzle is sleeved on the inner atomizing nozzle, the nozzle of the outer atomizing nozzle is close to the nozzle of the inner atomizing nozzle, a flow dividing chamber is formed between the outer atomizing nozzle and the inner atomizing nozzle, a conical air passage is formed inside the inner atomizing nozzle, a plurality of flow dividing air passages are opened on the inner wall of the conical air passage, and the flow dividing air passages are connected to the flow dividing chamber; The compressed air pipe is connected to an external air source device through an internal ventilation pipeline of the spray gun body. The wire guide tube sleeve is provided with a conductive member. One end of the wire guide tube extends into the conical air passage. The axis lines of the two groups of wire guide tubes intersect on the axis line of the compressed air pipe.

2. An arc spray gun according to claim 1, characterized in that: The nozzle of the outer atomizing nozzle is recessed and extends inwardly, and an annular inclined flow guide curved surface is formed around the nozzle of the outer atomizing nozzle.

3. An arc spray gun according to claim 2, characterized in that: A partition is arranged between the inner atomizing nozzle and the outer atomizing nozzle, the partition is provided with a diversion air hole corresponding to the diversion air channel, a partition opening is arranged at the center of the partition, the partition opening is arranged close to the nozzle of the inner atomizing nozzle and the nozzle of the outer atomizing nozzle, and forms an annular ventilation cavity.

4. An arc spray gun according to claim 1, characterized in that: The spray gun body is provided with a plurality of tightening bolts, and the spray gun body is provided with a plurality of through holes around the wire guide tube, and the tightening bolts pass through the through holes to tighten the wire guide tube.

5. An arc spray gun according to claim 1, characterized in that: It also includes a wire feeding assembly and a driver, wherein the wire feeding assembly includes two groups of active wire feeding wheels and two groups of driven wire feeding wheels, the active wire feeding wheels and the driven wire feeding wheels are correspondingly arranged on the left and right sides of the other end port of the wire guide tube, and a rotating part is arranged at the output end of the driver, and the active wire feeding wheel is arranged on the rotating part.

6. An arc spray gun according to claim 5, characterized in that: The wire feeding assembly further comprises a wire pressing block and an adjusting member, wherein the wire pressing block is detachably embedded in the spray gun body, the driven wire feeding wheel is rotatably arranged on the wire pressing block, and the adjusting member is penetrated through the spray gun body; The adjusting member includes an adjusting rod, a spring and a positioning block. The spring is sleeved on the adjusting rod body. One end of the spring is connected to the adjusting rod, and the other end of the spring is connected to the positioning block. A pressing portion is provided at one end of the adjusting rod away from the positioning block, and the pressing portion abuts against the wire pressing block.

7. An arc spray gun according to claim 6, characterized in that: The pressing part includes a mounting block and a pressing screw. The mounting block is arranged at one end of the adjusting rod away from the positioning block. The pressing screw is arranged on the mounting block along the moving direction of the adjusting rod, and the pressing screw abuts against the thread pressing block.

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