A large workpiece electrostatic powder spraying room

Abstract

The invention discloses a large-scale workpiece electrostatic powder spraying room, which belongs to the technical field of powder spraying equipment, including an automatic powder spraying room and an automatic powder spraying device, characterized in that: an automatic powder spraying device for powder spraying large workpieces in the automatic powder spraying room is installed above the automatic powder spraying room; a completely open opening in a specific area is arranged on the top of the automatic powder spraying room; a circulating air system for generating vertical downward airflow inside the automatic powder spraying room is installed in the automatic powder spraying room. The powder electrostatic powder spraying room has the three advantages of high automatic spraying completion ratio, less manual work and energy saving, which can save labor costs and reduce power energy consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of powder spraying equipment, and in particular relates to an electrostatic powder spraying room for large workpieces. Background Art

[0002] Electrostatic powder spraying is the dominant powder coating method in the field of industrial coating. The paint sprayed by the electrostatic powder spray gun makes the powder particles carry negative charges while dispersing. The charged powder particles are affected by airflow (or other forces such as centrifugal force) and electrostatic attraction, and are coated on the grounded object, and then heated, melted and solidified into a film.

[0003] Compared with liquid paint spraying technology, electrostatic powder spraying technology can reduce the degree of environmental pollution; spray powder is easy to recycle and has a high utilization rate, which has relatively significant economic benefits; powder coatings do not produce organic volatiles, avoiding the waste caused by volatilization into the atmosphere, so compared with liquid coatings, the energy cost is greatly reduced; electrostatic powder spraying technology has excellent coating properties, such as coating durability, abrasion resistance, impact resistance, adhesion, toughness, corrosion resistance and chemical resistance, and powder coatings used outdoors, in addition to the above advantages, also include high weather resistance and pollution resistance. Due to the above unique advantages, since the powder coating spraying technology entered the coating industry, the market share of powder coatings in general industrial coatings has continued to grow year by year.

[0004] At present, the spraying methods used in powder coating spraying technology mainly include manual spraying and automatic spraying. For the electrostatic spraying of large workpieces such as box trucks, dump trucks, warehouse trucks, tank trucks, and truck compartments, manual spraying is inefficient. Specifically, the traditional automatic spraying system is a simple powder spraying method that uses an automatic powder spraying gun to move vertically back and forth while the workpiece is moving at a low speed. If the movement direction of the automatic powder spraying gun is perpendicular to the direction of the workpiece movement, the proportion of automatic spraying completion is low. If the box truck compartment on the spraying assembly line moves longitudinally at a low speed, the inner surface of the front and rear end baffles and the outer surface of the baffle (hereinafter referred to as "front and rear end workpiece surfaces") of the compartment have a low proportion of automatic spraying completion, which requires a large amount of manual spraying and robot spraying to make up for it. Moreover, since the workpiece is moving at a low speed at the same time, the spraying quality of manual or robot spraying is difficult to guarantee. The above-mentioned large workpieces have large overall dimensions and large spraying areas. They are limited by the spraying working space of the spraying equipment and the range of motion of the automatic spray gun. Currently, there is no automatic powder spraying equipment on the market that can be applied to the above-mentioned large workpieces, especially that can efficiently process the front and rear end surfaces of large workpieces.

[0005] On the other hand, in the existing automatic powder spraying equipment, the workpiece is moving continuously during the powder spraying operation, and the inlet and outlet of the powder spraying room must remain open. Under the premise of ensuring full recovery of the powder, high requirements are placed on the air volume flow. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an electrostatic powder spraying room for large workpieces which solves the problems of low spraying efficiency and difficulty in ensuring spraying quality of large workpieces.

[0007] The present invention is implemented as follows: an electrostatic powder spraying room for large workpieces includes a workpiece transportation system for hanging large workpieces, an automatic powder spraying room and a manual powder spraying room are arranged in sequence along the travel line of the workpiece transportation system, the automatic powder spraying room and the manual powder spraying room are connected to form a combined powder spraying room with a workpiece inlet and a workpiece outlet at both ends, and the characteristic is that: an automatic powder spraying device for powder spraying large workpieces in the automatic powder spraying room is installed above the automatic powder spraying room; a circulating air system is installed in the automatic powder spraying room to generate a vertical downward airflow inside the automatic powder spraying room.

[0008] In the above technical solution, preferably, the automatic powder spraying device includes a three-dimensional right-angle rotating automatic spraying unit installed above the automatic powder spraying room, and the three-dimensional right-angle rotating automatic spraying unit includes an X-axis linear module, a Y-axis linear module, a Z-axis linear module, a turntable cylinder and an electrostatic powder spraying gun; the X-axis linear module is installed on the side of the automatic spraying room, the X-axis linear module is horizontally arranged and parallel to the travel axis of the workpiece suspension transportation system; the Y-axis linear module is mounted on the X-axis linear module and can be moved along The X-axis linear module is movable, and the Y-axis linear module extends horizontally inward above the automatic powder spraying room and is perpendicular to the X-axis linear module; the Z-axis linear module is mounted on the Y-axis linear module and can be movable along the Y-axis linear module, and the Z-axis linear module extends vertically downward and is perpendicular to the Y-axis linear module; the turntable cylinder is installed on the Z-axis linear module and can be movable vertically along the Z-axis linear module, and the rotating shaft of the turntable cylinder is parallel to the Z-axis linear module; the electrostatic powder spraying gun is installed on the turntable cylinder.

[0009] In the above technical solution, preferably, the upper part of the automatic powder spraying chamber is an opening larger than the overhead range of the workpiece, and the bottom of the automatic powder spraying chamber is provided with an air suction hole, and the air suction hole is connected to the dust collection device through a pipeline.

[0010] The advantages and technical effects of the present invention are:

[0011] The present invention provides an electrostatic spraying device that is suitable for large workpieces such as box trucks, dump trucks, grid trucks, tank trucks, and truck compartments, which is a combination of automatic and manual. The circulating air system in the device generates a vertical downward airflow in the automatic powder spraying room. The powder has a tendency to fall due to its own weight. Therefore, under the premise of ensuring that the powder is completely recovered, compared with the traditional powder spraying system that requires the workpiece to run at a low speed to be automatically sprayed, the air volume requirement of the circulating air system is 50% lower. The fan power requirement in the circulating air system is low, the noise is small, and it has the technical effect of energy saving. The automatic powder spraying room in the powder spraying room is equipped with an automatic powder spraying device that can electrostatically spray large workpieces. The automatic spraying device can efficiently complete the main spraying work of large workpieces, and cooperate with subsequent manual spraying to improve the spraying efficiency while ensuring a high spraying quality. Compared with the traditional pure manual spraying and the traditional automatic powder spraying system with low-speed running, the powder spraying room greatly reduces the amount of manual work and greatly reduces the consumption of electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 This is a schematic diagram of the installation structure of the automatic powder spraying device of the present invention:

[0014] Figure 3 It is a structural schematic diagram of the three-dimensional right-angle rotating automatic spraying unit in the present invention.

[0015] In the figure, 1. Workpiece suspension transportation system; 2. Gantry frame; 3. Automatic powder spraying room; 4. Manual powder spraying room; 5. Three-dimensional plus right-angle rotation automatic powder spraying device: 5-1. X-axis linear module; 5-2. Y-axis linear module; 5-3. Z-axis linear module; 5-4. Turntable cylinder; 5-5. Electrostatic powder spraying gun. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] In order to solve the current problems of low spraying efficiency and difficult to ensure spraying quality of large workpieces, the present invention provides a large workpiece electrostatic powder spraying room. This powder electrostatic powder spraying room has the three advantages of high automatic spraying completion ratio, less manual work and energy saving, which can save labor costs and reduce power energy consumption. In order to further illustrate the structure of the present invention, the detailed description is as follows in conjunction with the attached drawings:

[0018] Embodiment 1

[0019] See also Figure 1-Figure 3, a large workpiece electrostatic powder spraying room, including a workpiece suspension transportation system 1 for hanging large workpieces. The workpiece suspension transportation system 1 is a suspension conveyor, which is a conventionally known equipment in the field of machinery. It is a commonly used continuous conveying equipment, widely used in the continuous transportation of various finished items and bulk materials in containers or bags in the factory. It can also be used in the assembly lines of various industrial departments to transport workpieces between various processes, complete various process processes, and realize the comprehensive mechanization of transportation and process operations. Its structure is mainly composed of traction chains, slides, hangers, overhead rails, drive devices, tensioning devices and various safety devices. The extension direction of the overhead rail is the travel direction of the slide in the workpiece suspension transportation system 1. The drive device drives the slide to move along the overhead rail through the traction chain. The hanger is installed on the slide and is used to hang the workpiece. In this embodiment, the overhead rail is a straight line, and its extension direction is the travel line of the workpiece suspension transportation system 1. Gantry frames 2 are evenly distributed in the traveling direction of the workpiece suspension transportation system 1 . The gantry frames 2 serve as supporting frames for overhead tracks, and the overhead tracks are fixed on the gantry frames 2 .

[0020] An automatic powder spraying room 3 and a manual powder spraying room 4 are sequentially arranged along the travel line of the workpiece suspension transportation system 1. The automatic powder spraying room 3 and the manual powder spraying room 4 are connected to form a combined powder spraying room with a workpiece inlet and a workpiece outlet at both ends, respectively. This combined powder spraying room is the internal overall working space of the electrostatic powder spraying room. Specifically, the automatic powder spraying room 3 is a powder spraying working space with an upper opening and two ends opened, which is formed by two side walls.

[0021] An automatic powder spraying device 5 for spraying powder on a large workpiece inside the automatic powder spraying room 3 is installed above the automatic powder spraying room 3 .

[0022] In this embodiment, the automatic powder spraying device 5 includes a three-dimensional right-angle rotating automatic spraying unit installed on both sides above the automatic powder spraying room 3. The three-dimensional right-angle rotating automatic spraying unit includes an X-axis linear module 5-1, a Y-axis linear module 5-2, a Z-axis linear module 5-3, a turntable cylinder 5-4 and an electrostatic powder spraying gun 5-5.

[0023] The X-axis linear module 5-1 of the three-dimensional right-angle rotation automatic spraying unit located on the same side of the automatic powder spraying room 3 is a linear module extending along the upper edge of the side wall of the automatic spraying room 3. The X-axis linear module 5-1 is fixedly installed on the gantry frame 2. The X-axis linear module 5-1 is horizontally arranged and parallel to the travel axis of the workpiece suspension transportation system 1.

[0024] The X-axis linear module 5-1 is installed on the outer side of the automatic spraying room, and the X-axis linear module 5-1 is set horizontally.

[0025] The Y-axis linear module 5-2 is mounted on the X-axis linear module 5-1 and can be moved along the X-axis linear module 5-1. The Y-axis linear module 5-2 extends horizontally inward above the automatic powder spraying chamber 3 and is perpendicular to the X-axis linear module 5-1. The Z-axis linear module 5-3 is mounted on the Y-axis linear module 5-2 and can be moved along the Y-axis linear module 5-2. The Z-axis linear module 5-3 extends vertically downward and is perpendicular to the Y-axis linear module 5-2.

[0026] In this embodiment, the X-axis linear module 5-1 and the Y-axis linear module 5-2 are conventional known components with the same structure, that is, they include a linear guide, a rack, a slide and a motor. The slide is mounted on the linear guide, and the slide can move along the linear guide. The rack is parallel to the linear guide, and the motor is mounted on the slide. The output shaft of the motor is engaged with the gear of the rack, and the output shaft of the motor drives the gear to rotate, thereby realizing the movable movement of the slide along the linear guide.

[0027] The Z-axis linear module 5-3 includes a vertical linear guide sleeve, a linear slide, a rack and a motor. The linear slide is mounted on the linear guide sleeve and can be vertically telescopic. The rack is mounted on the linear slide and is parallel to the linear slide. The motor is mounted on the linear guide sleeve, and the output shaft of the motor is mounted with a gear meshing with the rack. When the motor is working, it can drive the linear slide to move vertically. The Z-axis linear module 5-3 is also a conventionally known linear module, and can be a multi-stage telescopic linear module, that is, it includes a set of linear guide sleeves that can be telescopically extended by a motor. The multi-stage telescopic linear module can reduce the upper height of the linear slide to a certain extent, which helps to reduce the overall working height of the powder spraying room.

[0028] In this embodiment, the linear guide rail of the X-axis linear module 5-1 is fixedly mounted on the gantry frame 2, and a plurality of slides are mounted on the linear guide rail of the X-axis linear module 5-1, and each slide is equipped with a motor for controlling the movable movement of the slide. The linear guide rail of the Y-axis linear module 5-2 is fixed on the slide of the X-axis linear module 5-1. The linear guide rail sleeve of the Z-axis linear module 5-3 is fixed on the slide of the Y-axis linear module 5-2.

[0029] The electrostatic powder spray gun 5-5 is mounted on the Z-axis linear module 5-3 and can be moved along the Z-axis linear module 5-3.

[0030] In this embodiment, specifically, a turntable cylinder 5-4 is fixed at the lower end of the linear slide of the Z-axis linear module 5-3, the axis of the rotating shaft of the turntable cylinder 5-4 is parallel to the linear slide of the Z-axis linear module 5-3, the cylinder body of the turntable cylinder 5-4 is fixed to the lower end of the linear slide by screws, and the turntable of the turntable cylinder 5-4 faces downward. A frame body is fixed on the lower end surface of the turntable of the turntable cylinder 5-4 by screws, and the required number of electrostatic automatic powder spraying guns 5-5 are installed on this frame body. The above structure enables the electrostatic powder spraying gun 5-5 to move along the X, Y, and Z three-dimensional space, and can achieve right-angle rotation with the Z axis as the rotating axis. In this way, the automatic powder spraying operation of the inner and outer surfaces of the box workpiece can be completed with a minimum of automatic powder spraying mechanisms.

[0031] In this embodiment, the top area of ​​the automatic powder spraying room 3 is completely open to meet the space required for the operation of the three-dimensional right-angle rotating automatic spraying unit installed on the top, ensuring that the automatic spraying device installed on the top can operate without obstacles and complete the spraying work of the outer walls around the workpiece. The size of the area above the automatic powder spraying room 3 is the size range of the workpiece plus the minimum space required for the operation of the automatic spraying device 5 installed on the top. This area is 600 mm or more larger than the surrounding area of ​​the workpiece projection.

[0032] Taking the electrostatic powder spraying work of a truck compartment as an example, the truck compartment is hoisted on the workpiece suspension transportation system 1, and enters the automatic powder spraying room from the workpiece inlet of the powder spraying room. After the workpiece enters the automatic powder spraying room 3, the movable doors of the workpiece inlet and the workpiece outlet are closed. The three-dimensional right-angle rotating automatic spraying unit is moved so that the electrostatic powder spraying guns 5-5 of different three-dimensional right-angle rotating automatic spraying units are located on the inner and outer sides of the left and right side panels of the truck compartment. The electrostatic powder spraying guns 5-5 are moved in the X-axis and Z-axis directions to realize the spraying of the inner and outer walls of the left and right side panels of the truck compartment.

[0033] After the left and right side panels of the truck compartment are sprayed, the turntable cylinder 5-4 of the three-dimensional right-angle rotating automatic spraying unit near the two ends of the truck compartment controls the electrostatic powder spraying gun 5-5 to rotate 90°, so that the electrostatic powder spraying guns 5-5 on the inside and outside of the truck compartment are opposite to the inner sides of the front and rear end surfaces of the truck compartment. Then, the electrostatic powder spraying gun 5-5 is moved in the Y-axis and Z-axis directions to spray the inner and outer walls of the front and rear end panels of the truck compartment.

[0034] The automatic spraying device can complete the automatic spraying of the inner and outer surfaces of large box-shaped workpieces, and the automatic surface area spraying ratio is the highest. In addition, the cable air pipe and powder hose of the electrostatic powder spray gun have a small rotation angle, so it is not easy to be damaged, and the pipelines of the electrostatic powder spray gun will not interfere with each other.

[0035] The top of the automatic powder spraying room is provided with an open opening, and the projection size of the top opening is larger than the plane projection of the largest workpiece that stops in the automatic powder spraying room, so that the three-dimensional plus rotating automatic powder spraying mechanism installed above the top of the automatic powder spraying room can run without obstacles and complete the automatic powder spraying operation on the surface of the workpiece. The automatic powder spraying room and the manual powder spraying room are connected. A closable movable door is installed at the workpiece inlet at the head end of the automatic powder spraying room 3, and a closable movable door is also installed at the workpiece outlet at the tail end of the manual powder spraying room 4. The workpiece enters the automatic powder spraying room and stops, and the movable doors of the workpiece inlet and outlet of the powder spraying room are closed, and then the automatic powder spraying mechanism performs the automatic powder spraying operation. The manual powder spraying room can also manually check the powder spraying operation at the same time.

[0036] The bottom of the automatic powder spraying room is provided with a bottom exhaust duct, and the exhaust port is reasonably arranged on the top plate of the duct, and the duct is connected to the exhaust fan. The upper opening of the automatic powder spraying room forms a vertical downward airflow in the automatic powder spraying room under the negative pressure of the exhaust port. The exhaust duct is connected to the dust collection device. In this embodiment, the dust collection device is a cyclone dust collector.

[0037] A three-dimensional linkage and rotating automatic powder spraying device is installed on the top of the automatic powder spraying room. The workpiece enters the automatic powder spraying room and stops at a designated position. Then the automatic powder spraying device automatically sprays according to the spraying program set for the corresponding workpiece to complete the automatic spraying operation on each surface. Moreover, before the workpiece stops for spraying, the automatic doors at the inlet and outlet of the spraying room are closed, negative pressure is formed in the exhaust chamber at the bottom of the spraying room, and the top is opened to let in air, thus forming a wind direction distribution in the spraying room with up and down convection.

[0038] This new type of powder electrostatic spraying room has three advantages: high automatic spraying completion ratio, less manual work and energy saving. It can save labor costs and reduce electricity consumption.

[0039] Embodiment 2

[0040] The present embodiment is distinguished from the above-mentioned embodiments in the selection of the workpiece transport system and the structure of the automatic spraying device.

[0041] Specifically, the workpiece transport system is a rail-type workpiece transport system. The rail-type workpiece transport system supports and transports the workpiece on the track. The workpiece is supported and transported on the ground track, which is a conventional known equipment. Combined with the workpiece transport system in the form of ground transportation, this system is more likely to play its advantages. There are no obstacles above the automatic powder spraying room. Therefore, the automatic powder spraying device on the top is very convenient to use. Two sets of automatic powder spraying devices for a powder spraying system can meet production needs, which is half the number of four sets of the suspension conveyor line.

[0042] In the present embodiment, the automatic spraying device includes an external spraying unit and an internal spraying unit installed on the side of the automatic powder spraying room. The external spraying unit and the internal spraying unit include the same X-axis linear module and Y-axis linear module as described in Example 1. The Z-axis linear module in the external spraying unit is a linear module extending downward from the Y-axis linear module, and its structure is the same as the X-axis linear module and the Y-axis linear module in Example 1, and adopts a vertical movable slide type. A turntable cylinder and an electrostatic powder spray gun are installed on the slide of the Z-axis linear module of the external spraying unit. The external spraying unit is an automatic device for spraying the outer wall of a large workpiece, and its working principle is the same as that of Example 1. In the present embodiment, the Z-axis linear module used in the internal spraying unit is a pneumatic scissor frame, which has an automatically controllable stable vertical telescopic function and belongs to an existing conventional known component. Compared with conventional linear modules in a broad sense, the length of the pneumatic scissor frame after retraction is extremely small. A turntable cylinder and an electrostatic powder spraying gun for spraying powder on the inner wall of a large workpiece are installed at the lower end of the pneumatic scissor frame, and its working principle is the same as that of the first embodiment.

[0043] The automatic spraying device described in this embodiment has extremely small requirements for vertical installation and working space, and thus has low requirements for factory building height.

[0044] In this embodiment, a dust suction pipe can be fixed at the lower part of the rectangular mounting frame of the electrostatic powder spray gun of the internal spray unit. The dust suction pipe is connected to the air inlet duct of the cyclone dust collector through a hose. The dust suction pipe has dust suction holes that generate downward airflow inside large workpieces.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrostatic powder spraying room for large workpieces, comprising a workpiece suspension transport system (1) for hanging large workpieces, an automatic powder spraying room (3) and a manual powder spraying room (4) are sequentially arranged along the travel line of the workpiece suspension transport system (1), the automatic powder spraying room (3) and the manual powder spraying room (4) are connected to form a combined powder spraying room with a workpiece inlet and a workpiece outlet at both ends, characterized in that: An automatic powder spraying device (5) for spraying powder on a large workpiece in the automatic powder spraying room (3) is installed above the automatic powder spraying room (3); a circulating air system for generating a vertical downward airflow inside the automatic powder spraying room (3) is installed in the automatic powder spraying room (3); The automatic powder spraying device (5) comprises a three-dimensional right-angle rotating automatic spraying unit installed on both sides above the automatic powder spraying room (3), and the three-dimensional right-angle rotating automatic spraying unit comprises an X-axis linear module (5-1), a Y-axis linear module (5-2), a Z-axis linear module (5-3), a turntable cylinder (5-4) and an electrostatic powder spraying gun (5-5); the X-axis linear module (5-1) is installed on the side of the automatic powder spraying room (3), the X-axis linear module (5-1) is horizontally arranged and parallel to the travel axis of the workpiece suspension transportation system (1); the Y-axis linear module (5-2) is mounted on the X-axis linear module (5-1) and can be moved along the X-axis linear module (5-1), and the Y The X-axis linear module (5-2) extends horizontally inward above the automatic powder spraying room (3) and is perpendicular to the X-axis linear module (5-1); the Z-axis linear module (5-3) is mounted on the Y-axis linear module (5-2) and can move along the Y-axis linear module (5-2); the Z-axis linear module (5-3) extends vertically downward and is perpendicular to the Y-axis linear module (5-2); the turntable cylinder (5-4) is mounted on the Z-axis linear module (5-3) and can move vertically along the Z-axis linear module (5-3); the rotating shaft of the turntable cylinder (5-4) is parallel to the Z-axis linear module (5-3); the electrostatic powder spraying gun (5-5) is mounted on the turntable cylinder (5-4); The upper part of the automatic powder spraying chamber (3) is an opening larger than the top-view range of the workpiece, and the bottom of the automatic powder spraying chamber (3) is provided with an air suction hole, and the air suction hole is connected to the dust collection device through a pipeline; The automatic powder spraying device (5) comprises an external spraying unit and an internal spraying unit installed on the side of the automatic powder spraying room (3); the external spraying unit and the internal spraying unit comprise an X-axis linear module and a Y-axis linear module; the Z-axis linear module in the external spraying unit is a linear module extending downward from the Y-axis linear module, adopts a vertical movable slide type, and a turntable cylinder and an electrostatic powder spraying gun are installed on the slide of the Z-axis linear module of the external spraying unit.

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