Electrostatic powder spraying device and spraying method thereof

Abstract

The present invention belongs to the technical field of high-voltage electrostatic powder spraying, and specifically is an electrostatic powder spraying device and a spraying method thereof; wherein the spraying device in the electrostatic powder spraying method comprises a shell, a handle, a nozzle and a switch unit; the switch unit comprises a No. 1 tube, a No. 2 tube, a baffle, an arc plate and an arc rod; the arc plate is slidably connected to the inner wall of the bottom end of the shell, so that the end of the baffle contacts the top of the arc plate, and a connecting rod is provided on the side wall of the arc plate, and there is an arc at the end of the arc plate, so that the end of the arc plate near the nozzle is higher; the arc rod is hinged on the side wall of the shell near the handle through a torsion spring, and a slide groove is opened on the arc rod; the end of the connecting rod is slidably connected in the slide groove; through the cooperation of the shell, the handle, the nozzle and the switch unit, the electrostatic powder is sprayed out through the nozzle and covers the surface of the part, thereby realizing the electrostatic powder processing of the part.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage electrostatic powder spraying, in particular to an electrostatic powder spraying device and a spraying method thereof. Background Art

[0002] The working principle of electrostatic powder spraying is almost the same as that of general liquid coating electrostatic spraying, except that powder spraying is dispersed rather than atomized; it is a coating sprayed by an electrostatic powder spray gun, which makes the powder particles negatively charged while dispersing. The charged powder particles are coated on the grounded object under the action of airflow (or other forces such as centrifugal force) and electrostatic attraction, and then heated, melted and solidified into a film; electrostatic powder spraying is the dominant powder coating method in the field of industrial coating; since the powder coating spraying technology entered the coating industry, the market share of powder coating in general industrial coatings has continued to grow year by year, and the reason is that powder spraying technology has unique advantages. With the increasingly stringent regulations on the content of volatile organic compounds in the atmosphere by environmental protection laws, the coating industry has been trying to develop a coating technology that is milder to the environment. After long-term research and experiments, it was found that "electrostatic powder spraying" is the cleanest coating technology that can be achieved at present. Powder coatings do not use volatile solvents such as organic solvents and water. They are inorganic solvent-based coatings, which greatly reduces the pollution hazards caused by solvents, including poisoning of operators caused by organic solvents; and will not cause fires due to organic solvents.

[0003] Although the application scope of electrostatic powder spraying is very wide, electrostatic powders will agglomerate with each other during the spraying process, which will cause the surface of the part to be rough when the electrostatic powder is sprayed onto the surface of the part, greatly affecting the spraying quality of the electrostatic powder. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art and solve the problem that electrostatic powders agglomerate with each other during the spraying process, the electrostatic powders will cause the surface of the parts to be rough when sprayed onto the surface of the parts, greatly affecting the spraying quality of the electrostatic powders; the present invention proposes an electrostatic powder spraying device and a spraying method thereof.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an electrostatic powder spraying device described in the present invention includes a shell, a handle, a spray head and a switch unit; the handle is installed at the bottom end of the shell; the spray head is installed on the side wall of the shell and is connected to the inside of the shell; the switch unit includes a No. 1 tube, a No. 2 tube, a baffle, an arc plate and an arc rod; the No. 1 tube is installed on the inner wall of the shell, so that the electrostatic powder enters the shell through the No. 1 tube; the end of the No. 2 tube is connected to the spray head; the baffle is installed on the inner wall of the shell through a spring, the baffle is slidably connected between the No. 1 tube and the No. 2 tube, and the baffle is sealed between the No. 1 tube and the No. 2 tube, and a No. 1 through hole is opened on the baffle; the arc plate is slidably connected to the inner wall of the bottom end of the shell, so that the end of the baffle is in contact with the top of the arc plate, and a connecting rod is provided on the side wall of the arc plate, and there is an arc at the end of the arc plate degree, so that the end of the arc plate near the nozzle is higher; the arc rod is hinged on the side wall of the shell near the handle through a torsion spring, and a slide groove is opened on the arc rod; the end of the connecting rod is slidably connected in the slide groove; the spraying of electrostatic powder is realized through the cooperation of the shell, the handle, the nozzle and the switch unit; during operation, when powder spraying is required, the staff holds the handle, aligns the nozzle to the required spraying position, presses the arc rod, so that the arc rod rotates around its hinge, thereby pushing the arc plate to move in the direction close to the nozzle, so that the baffle moves down along the top of the arc plate, and in the process of the baffle moving down, the No. 1 pipe and the No. 2 pipe are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe and the No. 2 pipe to the nozzle and is sprayed, so that the electrostatic powder is sprayed through the nozzle and covers the surface of the part, thereby realizing the electrostatic powder processing of the part.

[0006] Preferably, an air bag is provided in the shell; the air bag is installed on the inner side wall of the shell near the arc plate, so that the end of the arc plate contacts the air bag; the side wall of the baffle is provided with a vent, and the vent is connected to the air bag; the nozzle is cleaned by the cooperation of the air bag and the vent to avoid the accumulation of static electricity powder; during operation, when powder spraying is required, the staff holds the handle, aligns the nozzle to the required spraying position, presses the arc rod, so that the arc rod rotates around its hinge, thereby pushing the arc plate to move in the direction close to the nozzle, so that the baffle moves down along the top of the arc plate, and during the downward movement of the baffle, the No. 1 pipe and the No. 2 pipe are connected through the through hole, so that the static electricity powder flows through the No. 1 pipe and the No. 2 pipe to the nozzle and is sprayed out. When the spraying is completed, the staff releases the arc rod, so that the arc rod is reset under the torsion of the torsion spring, and the arc plate slides on the inner wall of the bottom end of the shell under the action of the connecting rod, so that the arc plate squeezes the airbag. At this time, the baffle moves toward the top of the shell under the action of the arc plate, so that the through hole moves out between the No. 1 tube and the No. 2 tube, blocking the No. 1 tube and connecting the vent to the No. 2 tube. After the airbag is pressurized, the internal gas flows into the nozzle through the vent, achieving a cleaning effect on the inside of the nozzle, avoiding electrostatic powder from agglomerating inside the nozzle, adhering to the inner wall of the nozzle, and remaining in the nozzle, thereby enhancing the use effect of the nozzle, avoiding the waste of electrostatic powder, and reducing the processing cost during the electrostatic spraying process.

[0007] Preferably, a filter is provided on the inner wall of the nozzle; a plurality of No. 2 through holes are opened on the filter; a fan blade is rotatably connected in the No. 2 through hole; the cooperation of the fan blade and the filter enables the electrostatic powder to be broken up by the fan blade after passing through the filter; during operation, when powder spraying is required, the staff holds the handle, aligns the nozzle to the required spraying position, presses the arc rod, so that the arc rod rotates around its hinge, thereby pushing the arc plate to move in the direction close to the nozzle, so that the baffle moves down along the top of the arc plate, and in the process of the baffle moving down, the No. 1 pipe and the No. 2 pipe are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe and the No. 2 pipe to the nozzle and is sprayed out, and when the airflow formed by the electrostatic powder passes through the filter, it drives the fan blade to rotate in the No. 2 through hole, so that the electrostatic powder is broken up by the fan blade, further reducing the agglomeration phenomenon of the electrostatic powder, enhancing the spraying effect of the electrostatic powder, ensuring the smoothness of the surface of the sprayed parts, and enhancing the use effect of the spraying device.

[0008] Preferably, a collision unit is provided on the inner wall of the nozzle; the collision unit includes a fixed rod, a collision rod and a ribbon; the end of the ribbon is fixed on the inner wall of the nozzle; the fixed rod is installed on the inner wall of the nozzle close to the filter; the collision rod is rotatably connected to the fixed rod, and the side wall of the collision rod is connected to the inner wall of the nozzle by a spring, and the end of the collision rod is connected to the ribbon by a thin rope; the collision unit is used to reduce the situation where static electricity powder adheres to the filter; during operation, when powder spraying is required, the staff holds the handle, aligns the nozzle to the desired spraying position, and presses the arc rod so that the arc rod is hinged around it. The arc plate rotates at the position where it moves, thereby pushing the arc plate to move toward the direction close to the nozzle, so that the baffle moves down along the top of the arc plate. During the downward movement of the baffle, the No. 1 pipe and the No. 2 pipe are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe and the No. 2 pipe to the nozzle and is sprayed out. The airflow formed by the electrostatic powder drives the ribbon to shake when passing through the nozzle, thereby driving the collision rod to rotate around the fixed rod. The collision rod collides with the filter during the rotation, thereby causing the filter to vibrate, further enhancing the crushing effect of the fan blades on the electrostatic powder and reducing the adhesion of the electrostatic powder to the filter.

[0009] Preferably, an arc-shaped cover is provided at the end of the nozzle, and the arc-shaped cover is concave outward, thereby increasing the spraying range of the nozzle; during operation, when powder spraying is required, the staff holds the handle, aligns the nozzle to the desired spraying position, presses the arc-shaped rod, and causes the arc-shaped rod to rotate around its hinge, thereby pushing the arc-shaped plate to move toward the nozzle, so that the baffle moves down along the top of the arc-shaped plate. During the downward movement of the baffle, the No. 1 pipe and the No. 2 pipe are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe and the No. 2 pipe to the nozzle and is sprayed out. Since an arc-shaped cover is provided at the end of the nozzle, and the arc-shaped cover is concave outward, the spraying range of the electrostatic powder is wider, thereby enhancing the spraying area and the spraying effect.

[0010] An electrostatic powder spraying method, which is applicable to the above-mentioned electrostatic powder spraying device, and the spraying method comprises the following steps:

[0011] S1: Clean the surface of the component to be sprayed to prevent impurities from adhering to the surface of the component to be sprayed and affecting the spraying quality, place the cleaned component to be sprayed and the electric field generating element together, and form an electrostatic force field between the electric field generating element and the component to be sprayed;

[0012] S2: shaping the electrostatic force field formed by S1 by using an electric field shaping element, so that the Faraday cage electrostatic shielding effect generated by the electrostatic force field shaped by the electric field shaping element around the recessed area of ​​the component to be sprayed is smaller than the Faraday cage electrostatic shielding effect generated by the electrostatic force field not shaped by the electric field shaping element around the recessed area of ​​the component to be sprayed;

[0013] S3: When the electrostatic powder is sprayed into the electrostatic force field by using the electrostatic powder spraying device, the electrostatic powder can be guided to the surface of the component to be sprayed in the electrostatic force field, thereby completing the spraying of the electrostatic powder.

[0014] Preferably, the trajectory of the electrostatic powder guided in the electrostatic force field is a spiral motion along the movement axis of the ejected jet airflow, thereby ensuring the coating effect of the electrostatic powder. When the electrostatic powder is guided, it can form an impact force with the surface of the part, thereby enhancing the adhesion of the electrostatic powder to the surface of the part, and enabling the electrostatic powder to increase its contact area with the surface of the part in a spiral motion state, thereby increasing the spraying range of the electrostatic powder.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The electrostatic powder spraying device and the spraying method described in the present invention can clean the nozzle through the cooperation of the air bag and the vent, avoid the accumulation of electrostatic powder, and achieve the cleaning effect on the inside of the nozzle, so as to avoid the electrostatic powder from agglomerating inside the nozzle, adhering to the inner wall of the nozzle, and remaining in the nozzle, thereby enhancing the use effect of the nozzle, avoiding the waste of electrostatic powder, and reducing the processing cost during the electrostatic spraying process.

[0017] 2. The electrostatic powder spraying device and the spraying method described in the present invention enable the filter to vibrate through the cooperation of the fixed rod, the collision rod and the ribbon, further enhancing the crushing effect of the fan blades on the electrostatic powder and reducing the adhesion of the electrostatic powder to the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 is a flow chart of the spraying method of the present invention;

[0020] Figure 2 is a three-dimensional diagram of the spraying device of the present invention;

[0021] Figure 3 is a cross-sectional view of the spraying device of the present invention;

[0022] Figure 4 yes Figure 3 A local enlarged view of point A in FIG.

[0023] Figure 5 yes Figure 3 A local enlarged view of point B in FIG.

[0024] In the figure: shell 1, handle 2, nozzle 3, filter 31, No. 2 through hole 311, fan blade 312, arc cover 32, switch unit 4, No. 1 tube 41, No. 2 tube 42, baffle 43, No. 1 through hole 431, vent 432, arc plate 44, connecting rod 441, arc rod 45, slide groove 451, airbag 5, collision unit 6, fixing rod 61, collision rod 62, ribbon 63. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] like Figures 1 to 5 As shown, an electrostatic powder spraying device according to the present invention comprises a housing 1, a handle 2, a spray head 3 and a switch unit 4; the handle 2 is mounted on the bottom end of the housing 1; the spray head 3 is mounted on the side wall of the housing 1 and is connected to the inside of the housing 1; the switch unit 4 comprises a No. 1 pipe 41, a No. 2 pipe 42, a baffle 43, an arc plate 44 and an arc rod 45; the No. 1 pipe 41 is mounted on the inner side wall of the housing 1, so that the electrostatic powder enters the housing 1 through the No. 1 pipe 41; the No. 2 pipe 42 The end is connected to the nozzle 3; the baffle 43 is installed on the inner wall of the shell 1 through a spring, and the baffle 43 is slidably connected between the No. 1 tube 41 and the No. 2 tube 42, and the baffle 43 is sealed between the No. 1 tube 41 and the No. 2 tube 42, and a No. 1 through hole 431 is opened on the baffle 43; the arc plate 44 is slidably connected to the inner wall of the bottom end of the shell 1, so that the end of the baffle 43 contacts the top of the arc plate 44, and a connecting rod 441 is provided on the side wall of the arc plate 44, and there is an arc at the end of the arc plate 44 , so that the end of the arc plate 44 near the nozzle 3 is higher; the arc rod 45 is hinged on the side wall of the shell 1 near the handle 2 through a torsion spring, and a slide groove 451 is opened on the arc rod 45; the end of the connecting rod 441 is slidably connected in the slide groove 451; the spraying of electrostatic powder is achieved through the cooperation of the shell 1, the handle 2, the nozzle 3 and the switch unit 4; when working, when powder spraying is required, the staff holds the handle 2, aligns the nozzle 3 to the required spraying position, and presses the arc rod 45, so that the arc rod 45 rotates around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle 43 moves down along the top of the arc plate 44. During the downward movement of the baffle 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out, so that the electrostatic powder is sprayed out through the nozzle 3 and covers the surface of the part, thereby realizing the electrostatic powder processing of the part.

[0027] As an embodiment of the present invention, an airbag 5 is provided in the shell 1; the airbag 5 is installed on the inner wall of the shell 1 near the arc plate 44, so that the end of the arc plate 44 contacts the airbag 5; the side wall of the baffle 43 is provided with a vent 432, and the vent 432 is connected to the airbag 5; the cooperation of the airbag 5 and the vent 432 is used to clean the nozzle 3 to avoid the accumulation of electrostatic powder; during operation, when powder spraying is required, the staff holds the handle 2, aligns the nozzle 3 to the required spraying position, presses the arc rod 45, so that the arc rod 45 rotates around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle 43 moves down along the top of the arc plate 44, and during the downward movement of the baffle 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 The air bag 5 is sprayed out from the nozzle 3. When the spraying is completed, the staff releases the arc rod 45, so that the arc rod 45 is reset under the torsion of the torsion spring, and the arc plate 44 slides on the inner wall of the bottom end of the shell 1 under the action of the connecting rod 441, so that the arc plate 44 squeezes the air bag 5. At this time, the baffle 43 moves toward the top of the shell 1 under the action of the arc plate 44, so that the through hole moves out between the No. 1 pipe 41 and the No. 2 pipe 42, blocks the No. 1 pipe 41, and connects the vent 432 with the No. 2 pipe 42. After the air bag 5 is pressurized, the internal gas flows into the nozzle 3 through the vent 432, thereby cleaning the inside of the nozzle 3 and avoiding the electrostatic powder from agglomerating inside the nozzle 3, adhering to the inner wall of the nozzle 3, and remaining in the nozzle 3, thereby enhancing the use effect of the nozzle 3, avoiding the waste of electrostatic powder, and reducing the processing cost during the electrostatic spraying process.

[0028] As an embodiment of the present invention, a filter screen 31 is provided on the inner wall of the nozzle 3; a plurality of No. 2 through holes 311 are opened on the filter screen 31; a fan blade 312 is rotatably connected in the No. 2 through hole 311; the cooperation between the fan blade 312 and the filter screen 31 enables the electrostatic powder to be crushed by the fan blade 312 after passing through the filter screen 31; during operation, when powder spraying is required, the staff holds the handle 2, aligns the nozzle 3 to the desired spraying position, presses the arc rod 45, and causes the arc rod 45 to rotate around its hinge, thereby pushing the arc plate 44 to the direction close to the nozzle 3. The baffle plate 43 moves downward along the top of the arc plate 44. During the downward movement of the baffle plate 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out. When the airflow formed by the electrostatic powder passes through the filter screen 31, the fan blade 312 is driven to rotate in the No. 2 through hole 311, so that the electrostatic powder is broken by the fan blade 312, further reducing the agglomeration phenomenon of the electrostatic powder, strengthening the spraying effect of the electrostatic powder, ensuring the smoothness of the surface of the sprayed parts, and enhancing the use effect of the spraying device.

[0029] As an embodiment of the present invention, a collision unit 6 is provided on the inner wall of the nozzle 3; the collision unit 6 includes a fixing rod 61, a collision rod 62 and a ribbon 63; the end of the ribbon 63 is fixed on the inner wall of the nozzle 3; the fixing rod 61 is installed on the inner wall of the nozzle 3 close to the filter 31; the collision rod 62 is rotatably connected to the fixing rod 61, and the side wall of the collision rod 62 is connected to the inner wall of the nozzle 3 by a spring, and the end of the collision rod 62 is connected to the ribbon 63 by a thin rope; the collision unit 6 is used to reduce the situation where electrostatic powder adheres to the filter 31; during operation, when powder spraying is required, the staff holds the handle 2, aligns the nozzle 3 to the desired spraying position, and presses the arc rod 45 so that the arc rod 4 5 rotates around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle plate 43 moves down along the top of the arc plate 44. During the downward movement of the baffle plate 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out. The airflow formed by the electrostatic powder drives the ribbon 63 to shake when passing through the nozzle 3, thereby driving the collision rod 62 to rotate around the fixed rod 61. The collision rod 62 collides with the filter screen 31 during the rotation process, so that the filter screen 31 vibrates, further enhancing the crushing effect of the fan blade 312 on the electrostatic powder and reducing the adhesion of the electrostatic powder to the filter screen 31.

[0030] As an embodiment of the present invention, an arc cover 32 is provided at the end of the nozzle 3, and the arc cover 32 is concave, thereby increasing the spraying range of the nozzle 3; during operation, when powder spraying is required, the staff holds the handle 2, aligns the nozzle 3 to the desired spraying position, presses the arc rod 45, so that the arc rod 45 rotates around its hinge, thereby pushing the arc plate 44 to move toward the nozzle 3, so that the baffle 43 moves down along the top of the arc plate 44, and in the process of the baffle 43 moving downward, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out. Since the arc cover 32 is provided at the end of the nozzle 3, and the arc cover 32 is concave, the spraying range of the electrostatic powder is wider, and the spraying area and the spraying effect are enhanced.

[0031] An electrostatic powder spraying method, which is applicable to the above-mentioned electrostatic powder spraying device, and the spraying method comprises the following steps:

[0032] S1: Clean the surface of the component to be sprayed to prevent impurities from adhering to the surface of the component to be sprayed and affecting the spraying quality, place the cleaned component to be sprayed and the electric field generating element together, and form an electrostatic force field between the electric field generating element and the component to be sprayed;

[0033] S2: shaping the electrostatic force field formed by S1 by using an electric field shaping element, so that the Faraday cage electrostatic shielding effect generated by the electrostatic force field shaped by the electric field shaping element around the recessed area of ​​the component to be sprayed is smaller than the Faraday cage electrostatic shielding effect generated by the electrostatic force field not shaped by the electric field shaping element around the recessed area of ​​the component to be sprayed;

[0034] S3: When the electrostatic powder is sprayed into the electrostatic force field by using the electrostatic powder spraying device, the electrostatic powder can be guided to the surface of the component to be sprayed in the electrostatic force field, thereby completing the spraying of the electrostatic powder.

[0035] As an embodiment of the present invention, the trajectory of the electrostatic powder guided in the electrostatic force field is a spiral motion along the movement axis of the ejected jet airflow, thereby ensuring the coating effect of the electrostatic powder. When the electrostatic powder is guided, it can form an impact force with the surface of the part, thereby enhancing the adhesion of the electrostatic powder to the surface of the part, and enabling the electrostatic powder to increase its contact area with the surface of the part in a spiral motion state, thereby increasing the spraying range of the electrostatic powder.

[0036] During operation, when powder spraying is required, the staff member holds the handle 2, aligns the nozzle 3 to the desired spraying position, and presses the arc rod 45, so that the arc rod 45 rotates around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle 43 moves down along the top of the arc plate 44. During the downward movement of the baffle 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out, so that the electrostatic powder is sprayed through the nozzle 3 and covers the surface of the part, thereby realizing the electrostatic powder processing of the part; when powder spraying is required, the staff member holds the handle 2, aligns the nozzle 3 to the desired spraying position, and presses the arc rod 45, so that the arc rod 45 rotates around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle 43 moves down along the top of the arc plate 44. During the downward movement of the baffle 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out, so that the electrostatic powder is sprayed through the nozzle 3 and covers the surface of the part, thereby realizing the electrostatic powder processing of the part. When the desired spraying position is reached, the arc rod 45 is pressed to rotate the arc rod 45 around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle 43 moves down along the top of the arc plate 44. During the downward movement of the baffle 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out. When the spraying is completed, the staff releases the arc rod 45, so that the arc rod 45 is reset under the torsion of the torsion spring, and the arc plate 44 slides on the inner side wall of the bottom end of the shell 1 under the action of the connecting rod 441, so that the arc plate 44 squeezes the airbag 5. At this time, the baffle 43 is in the arc Under the action of plate 44, it moves toward the top of shell 1, so that the through hole moves out between pipe 1 41 and pipe 2 42, blocks pipe 1 41, and connects vent 432 with pipe 2 42. After air bag 5 is pressurized, the internal gas flows into nozzle 3 through vent 432, so as to clean the inside of nozzle 3 and avoid electrostatic powder agglomeration inside nozzle 3, adhering to the inner wall of nozzle 3 and remaining in nozzle 3, thereby enhancing the use effect of nozzle 3, avoiding the waste of electrostatic powder and reducing the processing cost in the process of electrostatic spraying. When powder spraying is required, the staff holds handle 2, aligns nozzle 3 to the required spraying position, and presses arc rod 45. The arc rod 45 is caused to rotate around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle plate 43 moves down along the top of the arc plate 44. During the downward movement of the baffle plate 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out. When the airflow formed by the electrostatic powder passes through the filter screen 31, the fan blade 312 is driven to rotate in the No. 2 through hole 311, so that the electrostatic powder is broken by the fan blade 312, further reducing the agglomeration phenomenon of the electrostatic powder, enhancing the spraying effect of the electrostatic powder, ensuring the smoothness of the surface of the sprayed parts, and enhancing the use effect of the spraying device;When powder spraying is required, the staff holds the handle 2, aligns the nozzle 3 to the required spraying position, and presses the arc rod 45 to make the arc rod 45 rotate around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle 43 moves down along the top of the arc plate 44. During the downward movement of the baffle 43, the No. 1 pipe 41 and the No. 2 pipe 42 are connected through the through hole, so that the electrostatic powder flows through the No. 1 pipe 41 and the No. 2 pipe 42 to the nozzle 3 and is sprayed out. The airflow formed by the electrostatic powder drives the ribbon 63 to shake when passing through the nozzle 3, thereby driving the collision rod 62 to rotate around the fixed rod 61. The collision rod 62 will collide with the filter 31 during the rotation, so that the filter 31 will vibrate, further strengthening the fan The blade 312 has a crushing effect on the electrostatic powder and reduces the situation where the electrostatic powder adheres to the filter 31; when powder spraying is required, the staff holds the handle 2, moves the nozzle 3 to the desired spraying position, presses the arc rod 45, and makes the arc rod 45 rotate around its hinge, thereby pushing the arc plate 44 to move in the direction close to the nozzle 3, so that the baffle 43 moves down along the top of the arc plate 44. During the downward movement of the baffle 43, the first pipe 41 and the second pipe 42 are connected through the through hole, so that the electrostatic powder flows through the first pipe 41 and the second pipe 42 to the nozzle 3 and is sprayed out. Since the arc cover 32 is provided at the end of the nozzle 3, and the arc cover 32 is concave, the spraying range of the electrostatic powder is wider, and the spraying area and spraying effect are enhanced. ;

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electrostatic powder spraying device, characterized in that: The invention comprises a shell (1), a handle (2), a nozzle (3) and a switch unit (4); the handle (2) is mounted on the bottom end of the shell (1); the nozzle (3) is mounted on the side wall of the shell (1) and is communicated with the inside of the shell (1); the switch unit (4) comprises a first tube (41), a second tube (42), a baffle (43), an arc plate (44) and an arc rod (45); the first tube (41) is mounted on the inner wall of the shell (1) so that the electrostatic powder enters the shell (1) through the first tube (41); the end of the second tube (42) is connected to the nozzle (3); the baffle (43) is mounted on the inner wall of the shell (1) through a spring, and the baffle (43) is slidably connected between the first tube (41) and the second tube (42), so that the baffle (43) is in the first tube (41) and the second tube (42) is in the first tube (41). ) and the second tube (42) are sealed, and a first through hole (431) is formed on the baffle plate (43); the arc plate (44) is slidably connected to the inner side wall of the bottom end of the shell (1), so that the end of the baffle plate (43) contacts the top of the arc plate (44), and a connecting rod (441) is provided on the side wall of the arc plate (44), and the end of the arc plate (44) has an arc, so that the end of the arc plate (44) near the nozzle (3) is higher; the arc rod (45) is hinged on the side wall of the shell (1) near the handle (2) through a torsion spring, and a slide groove (451) is formed on the arc rod (45); the end of the connecting rod (441) is slidably connected in the slide groove (451); the spraying effect of the electrostatic powder is achieved through the cooperation of the shell (1), the handle (2), the nozzle (3) and the switch unit (4); An airbag (5) is provided in the shell (1); the airbag (5) is installed on the inner side wall of the shell (1) close to the arc plate (44), so that the end of the arc plate (44) contacts the airbag (5); a vent (432) is provided on the side wall of the baffle (43), and the vent (432) is connected to the airbag (5); the nozzle (3) is cleaned by the cooperation of the airbag (5) and the vent (432), thereby avoiding the accumulation of static powder; A filter screen (31) is provided on the inner side wall of the nozzle (3); a plurality of No. 2 through holes (311) are formed on the filter screen (31); a fan blade (312) is rotatably connected in the No. 2 through hole (311); the fan blade (312) and the filter screen (31) cooperate so that the electrostatic powder can be crushed by the fan blade (312) after passing through the filter screen (31); The inner wall of the nozzle (3) is provided with a collision unit (6); the collision unit (6) comprises a fixing rod (61), a collision rod (62) and a ribbon (63); the end of the ribbon (63) is fixed on the inner wall of the nozzle (3); the fixing rod (61) is installed on the inner wall of the nozzle (3) close to the filter (31); the collision rod (62) is rotatably connected to the fixing rod (61), and the side wall of the collision rod (62) is connected to the inner wall of the nozzle (3) through a spring, and the end of the collision rod (62) is connected to the ribbon (63) through a thin rope; the collision unit (6) is used to reduce the situation where static electricity powder adheres to the filter (31); An arc-shaped cover (32) is provided at the end of the spray head (3), and the arc-shaped cover (32) is concave, thereby increasing the spraying range of the spray head (3).

2. An electrostatic powder spraying method, characterized in that: The spraying method is applicable to the electrostatic powder spraying device according to claim 1, and the spraying method comprises the following steps: S1: Clean the surface of the component to be sprayed to prevent impurities from adhering to the surface of the component to be sprayed and affecting the spraying quality, place the cleaned component to be sprayed and the electric field generating element together, and form an electrostatic force field between the electric field generating element and the component to be sprayed; S2: shaping the electrostatic force field formed by S1 by using an electric field shaping element, so that the Faraday cage electrostatic shielding effect generated by the electrostatic force field shaped by the electric field shaping element around the recessed area of ​​the component to be sprayed is smaller than the Faraday cage electrostatic shielding effect generated by the electrostatic force field not shaped by the electric field shaping element around the recessed area of ​​the component to be sprayed; S3: When the electrostatic powder is sprayed into the electrostatic force field by using the electrostatic powder spraying device, the electrostatic powder can be guided to the surface of the component to be sprayed in the electrostatic force field, thereby completing the spraying of the electrostatic powder.

3. An electrostatic powder spraying method according to claim 2, characterized in that: The trajectory of the electrostatic powder guided in the electrostatic force field is a spiral motion along the motion axis of the ejected jet airflow, thereby ensuring the coating effect of the electrostatic powder.

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