An all-around electrostatic powder spraying device for metal workpieces

Abstract

This invention discloses an all-around electrostatic powder coating device for metal workpieces, belonging to the field of powder coating devices. The device includes a cabinet with a powder coating box fixedly connected to it. A transverse guide rail is installed inside the powder coating box, and an electric push rod is fixedly connected to the movable end of the transverse guide rail. A fixed frame is fixedly connected to the telescopic end of the electric push rod, and a double-layer spray head is fixedly connected to the fixed frame. A mounting hole is provided at the top of the cabinet, and a baking oven is fixedly connected inside the mounting hole. A pair of heat-insulating gates matching the baking oven are fixedly connected to the top of the inner wall of the cabinet, and a pair of movable supports matching the baking oven are fixedly connected to the top of the cabinet. This allows for simultaneous hot airflow to protect the powder spraying process from outside the sprayed powder airflow, and enables rapid baking after coating, allowing the powder on the workpiece to solidify quickly and improving the efficiency of the powder coating process.

Description

Technical Field

[0001] This invention relates to the field of powder spraying equipment, and in particular to an all-around electrostatic powder spraying equipment for metal workpieces. Background Technology

[0002] Electrostatic spraying is a coating method that utilizes the principle of corona discharge to cause atomized paint to become negatively charged under the action of a high-voltage DC electric field, and then adsorb onto the surface of a positively charged substrate for discharge. Electrostatic powder spraying equipment uses a spray gun to spray powder, which, by imparting a negative charge to the dispersed powder ions, adheres to a grounded substrate under the influence of electrostatic attraction, and is then heated to melt and solidify into a film.

[0003] However, existing electrostatic spraying equipment relies solely on the powder adhering to the surface of the object under electrostatic action, resulting in slow powder coating efficiency, a large amount of powder waste, and potentially uneven adhesion, thus affecting the effect of electrostatic spraying. Summary of the Invention

[0004] 1. Technical problems to be solved

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide an all-around electrostatic powder coating device for metal workpieces. This solution can achieve the following: during the powder coating process, a hot airflow is simultaneously sprayed out from the outside of the sprayed powder airflow for protection, so that the preheated powder remains heated during the spraying process. After the preheated powder comes into contact with the pre-baked workpiece, the powder is heated to a slightly molten state and adheres to the workpiece. Under the combined action of electrostatics and adhesion, the powder on the workpiece is not easily detached from the workpiece by the airflow. Moreover, after the coating is completed, a baking process can be quickly carried out to allow the powder on the workpiece to solidify rapidly, which can easily improve the efficiency of the workpiece powder coating process.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] An all-around electrostatic powder coating device for metal workpieces includes a cabinet. A powder coating box is fixedly connected to the cabinet. A transverse guide rail is installed inside the powder coating box. An electric push rod is fixedly connected to the movable end of the transverse guide rail. A fixed frame is fixedly connected to the telescopic end of the electric push rod. A double-layer nozzle is fixedly connected to the fixed frame. An air inlet pipe and a feed pipe are installed on the double-layer nozzle. The double-layer nozzle includes a fixed block. An outer shell is fixedly connected to the lower end of the fixed block. An electrostatic spraying device connected to the fixed block is provided inside the outer shell. Multiple evenly distributed spray pipes are fixedly connected to the electrostatic spraying device. Multiple air outlets matching the spray pipes are opened at the bottom end of the outer shell. A mounting hole is opened at the top of the cabinet. A baking oven is fixedly connected to the mounting hole. A pair of heat insulation gates matching the baking oven are fixedly connected to the top of the inner wall of the cabinet. A pair of movable supports matching the baking oven are fixedly connected to the top of the cabinet. The movable supports include support rods. A hydraulic system connects the support rods to the cabinet. The cylinder has a servo motor fixedly connected to the top of the support rod. An inner rotating shaft is fixedly connected to the power output end of the servo motor. An L-shaped support rod is sleeved on the inner rotating shaft. A sleeve is rotatably connected to the top of the L-shaped support rod. A transmission belt is connected between the sleeve and the inner rotating shaft. A clamping rod is snapped into the sleeve. A pair of placement slots matching the L-shaped support rod are opened at the top of the baking oven. An electric motor is installed inside the support rod. A steering gear set is connected between the power output end of the electric motor and the L-shaped support rod. This solution can achieve the protection of the outside of the sprayed powder airflow during the powder spraying process by simultaneously spraying hot airflow. This keeps the preheated powder in a heated state during the spraying process. After the preheated powder comes into contact with the pre-baked workpiece, the powder is heated to a slightly molten state and adheres to the workpiece. Under the combined action of electrostatics and adhesion, the powder on the workpiece is not easily detached from the workpiece by the airflow. After the spraying is completed, the baking process can be quickly carried out to quickly solidify the powder on the workpiece, which can easily improve the efficiency of the workpiece powder spraying process.

[0009] Furthermore, the fixed block has a cavity communicating with the outer shell, the air inlet pipe is connected to the cavity, the input end of the electrostatic spraying device is connected to the feed pipe, and the feed pipe passes through the cavity, so that the powder material input by the feed pipe can be preheated by the hot airflow in the air.

[0010] Furthermore, the inner rotating shaft includes a long shaft, and a pulley matching the transmission belt is fixedly connected to the end of the long shaft away from the servo motor. A heat-insulating bearing is fixedly connected to the inner rotating shaft. The heat-insulating bearing is located between the pulley and the movable bracket. When baking in the oven after the heat-insulating gate is closed, the heat-insulating bearing provides heat insulation to prevent the heat in the oven from being transferred to the movable bracket through the L-shaped support rod, thus preventing the servo motor from being affected by high temperature.

[0011] Furthermore, the steering gear set includes a pair of bevel gears, and a toothed ring matching the bevel gears is fixedly connected to the outer wall of one end of the L-shaped support rod located inside the support rod. One bevel gear is fixedly connected to the power output end of the motor, and the other bevel gear meshes with the toothed ring.

[0012] Furthermore, the clamping rod includes a hollow fixed rod that engages with the sleeve, a movable rod inserted into the hollow fixed rod, a compression spring connected between the movable rod and the inner wall of the hollow fixed rod, and a clamping plate threadedly connected to the movable end away from the L-shaped support rod. The clamping rod elastically clamps the workpiece, and the length of the clamping rod is adjustable to accommodate workpieces of different sizes.

[0013] Furthermore, the electrostatic spraying device is made of thermally conductive material, the bottom of the outer casing is arc-shaped, and the diameter of the air outlet is 1.5 times the diameter of the electrostatic spraying device.

[0014] Furthermore, an air pump is installed inside the cabinet, and multiple evenly distributed recycling holes are opened at the top of the cabinet. A collection bag matching the recycling holes is connected between the cabinet and the air pump to facilitate the recycling of powder after spraying.

[0015] Furthermore, an all-around electrostatic powder coating device for metal workpieces includes a control system, which includes a controller installed inside a cabinet. The hydraulic cylinder, electric motor, servo motor, baking oven, transverse guide rail, and electric push rod are all electrically connected to the controller.

[0016] Furthermore, the L-shaped support rod is made of heat insulation material, and each of the pair of heat insulation gates has a matching locking hole at one end, and a sealing shell matching the L-shaped support rod is fixedly connected to the locking hole. After the pair of heat insulation gates are closed, the pair of heat insulation gates and the L-shaped support rod seal the opening of the oven.

[0017] Furthermore, a method of using an all-around electrostatic powder spraying device for metal workpieces is as follows:

[0018] S1, first control the movable bracket to rise, then clamp the metal workpiece through a pair of clamping rods, and then drive the L-shaped support rod to rotate 180° so that the L-shaped support rod faces downwards;

[0019] S2, control the movable support to descend, allowing the workpiece to enter the baking oven. After closing a pair of heat insulation gates, open the baking oven to pre-bake the workpiece.

[0020] S3. After pre-baking, reset the workpiece and use a double-layer nozzle to electrostatically spray powder onto the baking oven. During the electrostatic powder spraying process, the double-layer nozzle simultaneously outputs hot airflow through the outer shell.

[0021] S4. After the powder coating is completed, drive the L-shaped support rod to rotate 180° again so that the L-shaped support rod is facing downwards. Control the movable bracket to descend so that the workpiece enters the baking oven. After closing a pair of heat insulation gates, turn on the baking oven to bake the workpiece and cure the powder coating on the workpiece surface.

[0022] S5, after baking is complete, drive the workpiece to reset and output dry cold air through the double-layer nozzle to cool the workpiece.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the advantages of this invention are:

[0025] (1) This solution can achieve the protection of the outside of the sprayed powder airflow during the powder spraying process by simultaneously spraying hot airflow, so that the preheated powder is kept in a heated state during the spraying process. After the preheated powder comes into contact with the pre-baked workpiece, the powder is heated to a slightly molten state and adheres to the workpiece. Under the combined action of electrostatics and viscosity, the powder on the workpiece is not easy to fall off the workpiece under the action of airflow. After the spraying is completed, the baking process can be quickly carried out to make the powder on the workpiece solidify quickly, which can easily improve the efficiency of the workpiece powder spraying process.

[0026] (2) The electrostatic spraying device is made of thermally conductive material. The bottom of the outer shell is arc-shaped. The diameter of the air outlet is 1.5 times the diameter of the electrostatic spraying device. A cavity communicating with the outer shell is opened in the fixed block. The air inlet pipe is connected to the cavity. The input end of the electrostatic spraying device is connected to the feed pipe. The feed pipe passes through the cavity, so that the powder material input by the feed pipe can be preheated by the hot airflow in the air.

[0027] (3) The inner rotating shaft includes a long shaft rod. The end of the long shaft rod away from the servo motor is fixedly connected to a shaft wheel that matches the transmission belt. A heat-insulating bearing is fixedly connected on the inner rotating shaft. The heat-insulating bearing is located between the shaft wheel and the movable bracket. When the oven is used for baking after the heat-insulating gate is closed, the heat is insulated through the heat-insulating bearing to prevent the heat in the oven from being transferred to the movable bracket through the L-shaped support rod, thus preventing the servo motor from being affected by high temperature.

[0028] (4) The clamping rod includes a hollow fixed rod that is snapped into the sleeve. A movable rod is inserted into the hollow fixed rod. A compression spring is connected between the movable rod and the inner wall of the hollow fixed rod. A clamping plate is threaded to the movable end away from the L-shaped support rod. The clamping rod elastically clamps the workpiece, and the length of the clamping rod is adjustable to accommodate workpieces of different sizes.

[0029] (5) The L-shaped support rod is made of heat insulation material. Each of the two heat insulation gates has a matching hole at one end, and a sealing shell matching the L-shaped support rod is fixedly connected to the hole. After the two heat insulation gates are closed, the two heat insulation gates and the L-shaped support rod seal the opening of the oven. Attached Figure Description

[0030] Figure 1 This is a perspective view of the present invention;

[0031] Figure 2 This is a front view of the present invention;

[0032] Figure 3 This is a cross-sectional view of the present invention;

[0033] Figure 4 for Figure 3 Schematic diagram of the structure at point A;

[0034] Figure 5 for Figure 3 Schematic diagram of the structure at point B;

[0035] Figure 6 This is a top view of the present invention;

[0036] Figure 7 This is a cross-sectional view of the double-layer nozzle of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the double-layer nozzle of the present invention during operation.

[0038] Explanation of the labels in the diagram:

[0039] 1 Cabinet, 2 Powder spraying box, 3 Horizontal guide rail, 4 Electric push rod, 5 Fixing frame, 6 Double-layer spray head, 601 Fixing block, 602 Outer shell, 603 Electrostatic spraying device, 604 Spray pipe, 7 Baking oven, 8 Movable bracket, 801 Support rod, 802 Servo motor, 803 Inner rotating shaft, 9 L-shaped support rod, 10 Sleeve, 11 Clamping rod. Detailed Implementation

[0040] This embodiment 1 will be described clearly and completely with reference to the accompanying drawings, making the purpose, technical solution, and beneficial effects of the embodiments of this disclosure clearer. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0041] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the conventional meaning as understood by those skilled in the art. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "above," "below," "inner," and "outer" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] Example:

[0043] Please see Figure 1-3 An all-around electrostatic powder coating device for metal workpieces includes a cabinet 1, a powder coating box 2 fixedly connected to the cabinet 1, a sealed door installed on the powder coating box 2, a transverse guide rail 3 installed inside the powder coating box 2, the transverse guide rail 3 being an electric guide rail, an electric push rod 4 fixedly connected to the movable end of the transverse guide rail 3, a fixed frame 5 fixedly connected to the telescopic end of the electric push rod 4, a double-layer nozzle 6 fixedly connected to the fixed frame 5, an air inlet pipe and a material inlet pipe installed on the double-layer nozzle 6, and a mounting hole opened at the top of the cabinet 1 for installation. An oven 7 is fixedly connected inside the opening. A pair of heat-insulating gates matching the oven 7 are fixedly connected to the top of the inner wall of the cabinet 1. A cylinder matching the heat-insulating gates is installed inside the cabinet 1. The cylinder is used to control the opening and closing of the pair of heat-insulating gates. An air pump is installed inside the cabinet 1. Multiple evenly distributed recovery holes are opened at the top of the cabinet 1. The recovery holes are distributed near the opening of the oven 7. A collection bag matching the recovery holes is connected between the cabinet 1 and the air pump to facilitate the recovery of powder after spraying. A pair of movable supports 8 matching the oven 7 are fixedly connected to the top of the cabinet 1.

[0044] Please see Figure 3-6The movable support 8 includes a support rod 801. A hydraulic cylinder is connected between the support rod 801 and the cabinet 1. A servo motor 802 is fixedly connected to the top of the support rod 801. An inner rotating shaft 803 is fixedly connected to the power output end of the servo motor 802. An L-shaped support rod 9 is sleeved on the inner rotating shaft 803. The L-shaped support rod 9 is rotatably connected to the support rod 801. The L-shaped support rod 9 is made of heat insulation material. Each of the opposite ends of a pair of heat insulation gates has a locking hole that matches the L-shaped support rod. A sealing shell that matches the L-shaped support rod 9 is fixedly connected to the locking hole. After the pair of heat insulation gates are closed, the pair of heat insulation gates and the L-shaped support rod 9 seal the opening of the baking oven 7. A sleeve 10 is rotatably connected to the top of the L-shaped support rod 9. A transmission belt is connected between the sleeve 10 and the inner rotating shaft 803. A clamping rod 11 is snapped into the sleeve 10. A pair of placement slots matching the L-shaped support rod 9 are opened at the top of the baking oven 7. An electric motor is installed inside the support rod 801. A steering gear set is connected between the power output end of the electric motor and the L-shaped support rod 9. The steering gear set includes a pair of bevel gears. A toothed ring matching the bevel gear is fixedly connected to the outer wall of one end of the L-shaped support rod 9 inside the support rod 801. One bevel gear is fixedly connected to the power output end of the electric motor, and the other bevel gear meshes with the toothed ring. The inner rotating shaft 803 includes a long shaft. The end of the long shaft away from the servo motor 802 is fixedly connected to a pulley that matches the transmission belt. A heat-insulating bearing is fixedly connected to the inner rotating shaft 803. The inner rotating shaft 803 and the L-shaped support rod 9 rotate relative to each other through the heat-insulating bearing. The heat-insulating bearing is located between the pulley and the movable bracket 8. When baking in the baking oven 7 after the heat-insulating gate is closed, the heat-insulating bearing provides heat insulation to prevent the heat in the baking oven 7 from being transferred to the movable bracket 8 through the L-shaped support rod 9, thus preventing the servo motor 802 from being affected by high temperature.

[0045] Please see Figure 5 The clamping rod 11 includes a hollow fixed rod that is snapped into the sleeve 10. A movable rod is inserted into the hollow fixed rod. A compression spring is connected between the movable rod and the inner wall of the hollow fixed rod. A clamping plate is threaded to the movable end away from the L-shaped support rod 9. The clamping rod 11 elastically clamps the workpiece, and the length of the clamping rod 11 is adjustable to accommodate workpieces of different sizes.

[0046] Please see Figure 7-8The double-layer nozzle 6 includes a fixing block 601, with a housing 602 fixedly connected to the lower end of the fixing block 601. An electrostatic spraying device 603, connected to the fixing block 601, is housed inside the housing 602. Multiple evenly distributed spray pipes 604 are fixedly connected to the electrostatic spraying device 603. Multiple air outlets matching the spray pipes 604 are opened at the bottom of the housing 602. A cavity communicating with the housing 602 is opened inside the fixing block 601, and an air inlet pipe communicates with the cavity and is connected to an external air supply system. The input end of the electrostatic spraying device 603 is connected to a feed pipe, which is connected to an external powder feeding system. The feed pipe passes through the cavity, allowing the powder material input through the feed pipe to be preheated by the hot airflow. The electrostatic spraying device 603 is made of a thermally conductive material. The bottom of the housing 602 is arc-shaped, and the diameter of the air outlet is 1.5 times the diameter of the electrostatic spraying device 603.

[0047] An all-around electrostatic powder coating device for metal workpieces includes a control system. The control system includes a controller installed in a cabinet 1. A hydraulic cylinder, an electric motor, a servo motor 802, a baking oven 7, a transverse guide rail 3, and an electric push rod 4 are all electrically connected to the controller.

[0048] An all-around electrostatic powder coating device for metal workpieces, the method of use of which is as follows:

[0049] S1, first control the movable bracket 8 to rise, then clamp the metal workpiece through a pair of clamping rods 11, and then drive the L-shaped support rod 9 to rotate 180° so that the L-shaped support rod 9 faces downward.

[0050] S2, control the movable support 8 to descend, so that the workpiece enters the baking oven 7. After closing a pair of heat insulation gates, open the baking oven 7 to pre-bake the workpiece (the pre-baking temperature range of the workpiece is: between the melting point temperature and the softening point temperature of the powder used for powder spraying).

[0051] S3, After pre-baking, the workpiece is reset, and electrostatic powder coating is performed on the baking oven 7 using the double-layer nozzle 6. During the electrostatic powder coating process, the double-layer nozzle 6 simultaneously outputs hot airflow through the outer shell 602. During the powder coating process, a dry hot airflow is introduced to preheat the powder in the electrostatic spraying device 603 (those skilled in the art rotate the hot airflow of appropriate temperature according to the type of powder used, so that the powder is preheated to soften before being sprayed). Then, the electrostatic spraying device 603 is used for powder coating (during the powder coating process, the flow rate of the hot airflow output from the outer shell 602 is lower than the flow rate of the powder airflow output from the electrostatic spraying device 603). The double-layer nozzle 6 sprays powder through the spray pipe 604, and the powder airflow sprayed from the spray pipe 604 continuously interacts with the outer shell 602 as it is sprayed toward the workpiece. The hot airflow contacts the powder, continuously heating it to prevent its temperature from dropping. Furthermore, when the powder splashes after impacting the workpiece, the hot airflow outside the powder flow counteracts the splashed powder, reducing its kinetic energy and preventing it from splashing too far and entering the gaps within the powder spraying box 2, making it difficult to recover. The continuous contact between the hot airflow and the workpiece prevents the pre-baked workpiece from rapidly cooling. During powder spraying, technicians can control the rotation of the L-shaped support rod 9 or the sleeve 10 as needed. The sleeve 10 can rotate via a servo motor 802, which drives the inner shaft 803 to move the transmission belt. Alternatively, a stepper motor can drive the steering gear set to rotate the L-shaped support rod 9, allowing the workpiece to rotate or swing, facilitating spraying at different positions.

[0052] S4. After the powder coating is completed, drive the L-shaped support rod 9 to rotate 180° again so that the workpiece faces downward. Control the movable bracket 8 to descend so that the workpiece enters the baking oven 7. After closing a pair of heat insulation gates, turn on the baking oven 7 to bake the workpiece so that the powder coating on the workpiece surface is cured.

[0053] S5, after baking is complete, drive the workpiece to reset and output dry cold air through the double-layer nozzle 6 to cool the workpiece.

[0054] This solution allows for the simultaneous application of hot airflow to the outside of the powder spraying process, providing protection and keeping the preheated powder heated during spraying. Upon contact with the pre-baked workpiece, the preheated powder is heated to a slightly molten state and adheres to the workpiece. The combined effect of electrostatics and adhesion prevents the powder from easily detaching from the workpiece under the influence of the airflow. Furthermore, after spraying, a rapid baking process can be initiated to quickly solidify the powder on the workpiece, thus improving the efficiency of the powder spraying process.

[0055] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An all-around electrostatic powder spraying device for metal workpieces, comprising a cabinet (1), characterized in that: A powder spraying box (2) is fixedly connected to the cabinet (1). A horizontal guide rail (3) is installed inside the powder spraying box (2). An electric push rod (4) is fixedly connected to the movable end of the horizontal guide rail (3). A fixed frame (5) is fixedly connected to the telescopic end of the electric push rod (4). A double-layer nozzle (6) is fixedly connected to the fixed frame (5). An air inlet pipe and a feed pipe are installed on the double-layer nozzle (6). The double-layer nozzle (6) includes a fixing block (601). An outer shell (602) is fixedly connected to the lower end of the fixing block (601). The outer shell (602) is fixedly connected to the outer shell (602). 2) An electrostatic spraying device (603) connected to a fixed block (601) is provided inside. Multiple evenly distributed spray pipes (604) are fixedly connected to the electrostatic spraying device (603). Multiple air outlets matching the spray pipes (604) are opened at the bottom of the outer shell (602). A cavity communicating with the outer shell (602) is opened inside the fixed block (601). The air inlet pipe communicates with the cavity. The input end of the electrostatic spraying device (603) is connected to the feed pipe, and the feed pipe passes through the cavity, so that the powder material input by the feed pipe can be preheated by the hot airflow in the air. The cabinet (1) has a mounting hole at its top, and an oven (7) is fixedly connected to the mounting hole. A pair of heat-insulating gates matching the oven (7) are fixedly connected to the top of the inner wall of the cabinet (1). A pair of movable brackets (8) matching the oven (7) are fixedly connected to the top of the cabinet (1). The movable brackets (8) include support rods (801). A hydraulic cylinder is connected between the support rods (801) and the cabinet (1). A servo motor (802) is fixedly connected to the top of the support rods (801). An inner rotating shaft (803) is fixedly connected to the power output end of the oven. An L-shaped support rod (9) is sleeved on the inner rotating shaft (803). A sleeve (10) is rotatably connected to the top of the L-shaped support rod (9). A transmission belt is connected between the sleeve (10) and the inner rotating shaft (803). A clamping rod (11) is snapped into the sleeve (10). A pair of placement slots matching the L-shaped support rod (9) are opened at the top of the oven (7). An electric motor is installed in the support rod (801). A steering gear set is connected between the power output end of the electric motor and the L-shaped support rod (9).

2. The all-around electrostatic powder spraying device for metal workpieces according to claim 1, characterized in that: The inner rotating shaft (803) includes a long shaft, and a shaft wheel matching the transmission belt is fixedly connected to one end of the long shaft away from the servo motor (802). A heat-insulating bearing is fixedly connected to the inner rotating shaft (803), and the heat-insulating bearing is located between the shaft wheel and the movable bracket (8).

3. The all-around electrostatic powder spraying device for metal workpieces according to claim 1, characterized in that: The steering gear set includes a pair of bevel gears. The L-shaped support rod (9) is fixedly connected to the outer wall of one end of the support rod (801) with a toothed ring that matches the bevel gear. One bevel gear is fixedly connected to the power output end of the motor, and the other bevel gear meshes with the toothed ring.

4. The all-around electrostatic powder spraying device for metal workpieces according to claim 1, characterized in that: The clamping rod (11) includes a hollow fixed rod that engages with the sleeve (10). A movable rod is inserted into the hollow fixed rod. A compression spring is connected between the movable rod and the inner wall of the hollow fixed rod. A clamping plate is threaded to the end of the movable rod away from the L-shaped support rod (9).

5. The all-around electrostatic powder spraying device for metal workpieces according to claim 1, characterized in that: The electrostatic spray device (603) is made of thermally conductive material, the bottom end of the outer shell (602) is arc-shaped, and the diameter of the air outlet is 1.5 times the diameter of the electrostatic spray device (603).

6. The all-around electrostatic powder spraying device for metal workpieces according to claim 1, characterized in that: An air pump is installed inside the cabinet (1), and multiple evenly distributed recycling holes are opened at the top of the cabinet (1). A collection bag matching the recycling holes is connected between the cabinet (1) and the air pump.

7. The all-around electrostatic powder spraying device for metal workpieces according to claim 1, characterized in that: The system includes a control system comprising a controller installed in a cabinet (1), wherein the hydraulic cylinder, electric motor, servo motor (802), baking oven (7), transverse guide rail (3) and electric push rod (4) are all electrically connected to the controller.

8. The all-around electrostatic powder spraying device for metal workpieces according to claim 1, characterized in that: The L-shaped support rod (9) is made of heat insulation material, and each of the pair of heat insulation gates has a matching hole at one end.

9. The all-around electrostatic powder spraying device for metal workpieces according to claim 8, characterized in that: Its usage method is as follows: S1, first control the movable bracket (8) to rise, then clamp the metal workpiece through a pair of clamping rods (11), and then drive the L-shaped support rod (9) to rotate 180° so that the L-shaped support rod (9) faces downward; S2, control the movable support (8) to descend, so that the workpiece enters the baking oven (7), close a pair of heat insulation gates, and then open the baking oven (7) to pre-bake the workpiece; S3, after the pre-baking is completed, the workpiece is reset and electrostatic powder spraying is performed on the workpiece using a double-layer nozzle (6). During the electrostatic powder spraying process, the double-layer nozzle (6) simultaneously outputs hot airflow through the outer shell (602). S4. After the powder spraying is completed, drive the L-shaped support rod (9) to rotate 180° again so that the L-shaped support rod (9) faces downward. Control the movable bracket (8) to descend so that the workpiece enters the baking oven (7). After closing a pair of heat insulation gates, turn on the baking oven (7) to bake the workpiece so that the powder spraying on the surface of the workpiece is cured. S5. After baking, drive the workpiece to reset and output dry cold air through the double-layer nozzle (6) to cool the workpiece.

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