A pre-cleaning device for an evaporative coating machine

Abstract

This invention discloses a pre-cleaning device for an evaporative coating machine, solving the problems of frequent manual intervention, poor cleaning uniformity, and low operating efficiency in existing pre-cleaning equipment. The device includes an ultrasonic cleaner, a conveying device, two alternating tray assemblies, a support frame I, a conversion mechanism, a truss, a robotic arm, and a material rack. The conversion mechanism enables rotational switching and lifting / immersion cleaning within the ultrasonic cleaner; the robotic arm drives the material rack to move up and down within the tray assemblies, automating the transfer of parts. The tray assemblies are equipped with a pitch-adjusting component to ensure uniform cleaning. The conversion mechanism, through a ring guide rail and slider I, rotates smoothly and moves up and down precisely. The material rack, with its elastic structure and suspension rods, stably hooks and connects to the coating machine. The device achieves full-process automation, reduces errors, improves cleaning quality and efficiency, is adaptable to various parts specifications, and meets large-scale pre-cleaning needs.

Description

Technical Field

[0001] This invention relates to the field of parts cleaning technology, and more particularly to a pre-cleaning device for an evaporative coating machine. Background Technology

[0002] In evaporative coating production, pre-cleaning of parts before coating is a critical process. If impurities or oil remain on the surface, it will lead to poor adhesion of the coating layer, pinholes, or peeling. Currently, the industry mainly uses manual cleaning or semi-automated equipment, which has many shortcomings and cannot meet the needs of large-scale, high-quality production. The specific problems are as follows:

[0003] Most pre-cleaning processes rely on manual labor, such as manually moving parts to the cleaning tank and taking them out and transferring them after cleaning. During this process, parts are easily damaged or contaminated due to placement deviations or improper handling. Thin and light parts are particularly prone to errors. Manual contact with corrosive cleaning agents can easily damage the skin, and there is also a risk of pinching injuries when working near moving parts of the equipment. At the same time, manual operation has low standardization, the quality of operation is unstable, and labor costs increase with the scale of production.

[0004] Existing equipment is mostly single-station operation, requiring the cleaning and transfer of one batch of parts before it can take on the next batch, resulting in significant waiting gaps. The transfer after cleaning relies on manual labor or a single mechanical structure, which is slow and requires manual adjustment of position, leading to long operation cycles. As the industry develops on a large scale, traditional equipment is likely to become a production bottleneck.

[0005] Therefore, those skilled in the art provide a pre-cleaning device for an evaporative coating machine to solve the problems mentioned in the background art. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a pre-cleaning device for an evaporation coating machine.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A pre-cleaning device for an evaporation coating machine includes: an ultrasonic cleaner;

[0009] A conveying device, which is fixedly installed on one side of the ultrasonic cleaner, is used to convey parts to be cleaned;

[0010] Two tray assemblies are positioned above the ultrasonic cleaner and used alternately to cooperate with the conveying device to receive parts.

[0011] Support frame I, which is bolted to the top of the ultrasonic cleaner;

[0012] A conversion mechanism is rotatably mounted on support frame I, and a tray assembly is fixedly connected to the conversion mechanism;

[0013] A truss, which is located on the side of the ultrasonic cleaner away from the conveying device;

[0014] A robotic arm, which is slidably mounted on a truss via a slider, with a pneumatic chuck fixed to its end;

[0015] A material rack, which is clamped in a pneumatic chuck and cooperates with a material tray assembly;

[0016] The conversion mechanism drives the material tray assembly to rotate and switch to the end of the conveying device to receive parts. Then, the material tray assembly is driven to be immersed in the ultrasonic cleaner to clean the parts. The robotic arm drives the material rack to rise and fall in the material tray assembly, realizing automatic transfer of parts and reducing manual intervention.

[0017] As a further improvement to the above technical solution:

[0018] The tray assembly includes:

[0019] An extension frame, which is inserted into the conversion mechanism;

[0020] Support frame II, which is fixed to one side of the extension frame by welding;

[0021] Multiple feeding trays, which are annular with one end open and the other end sealed, are fixed to one side of the support frame II;

[0022] A pitch control assembly, wherein the pitch control assembly is disposed on one side of the support frame II;

[0023] The variable pitch component drives multiple feeding trays to move closer or further apart from each other, preventing the upper feeding tray from blocking the lower feeding tray and ensuring that all components in the feeding trays are immersed in the cleaning fluid of the ultrasonic cleaner, thus improving the uniformity of cleaning.

[0024] The pitch control component includes:

[0025] Two fixed bases are symmetrically fixed to one side of the support frame II by bolts;

[0026] Two guide rods are fixedly connected in parallel between two fixed bases;

[0027] Multiple sliders II are slidably sleeved on the outer walls of two guide rods, and the feeding tray is fixed to one side of the sliders II and the lower guide rod;

[0028] Cylinder II, which is fixed to one side of support frame II by a bracket, and its output end is fixed to the upper slider II;

[0029] A telescopic barrier, wherein the telescopic barrier is connected between multiple sliders II;

[0030] Among them, cylinder II drives the upper slider II to slide along the guide rod, and drives the other sliders II to move synchronously through the telescopic rail, so as to achieve precise adjustment of the spacing of the feeding tray.

[0031] The conversion mechanism includes:

[0032] Drive shaft I is rotatably mounted between support frame I and ultrasonic cleaner via bearings;

[0033] A base plate is fixedly sleeved to the outer wall of the drive shaft I by a key connection, and an extension frame is inserted into the base plate;

[0034] An annular slide bar, which is fixed to the top of the base plate by bolts, and its center coincides with the axis of drive shaft I;

[0035] Two sliders I are fixed to the top of two extended frames respectively, forming a complete circle with the annular slider;

[0036] An annular guide rail is fixed to a support frame I by multiple support rods, and an annular slider and a slider I are slidably embedded in the inner wall of the annular guide rail.

[0037] Among them, drive shaft I drives the base plate to rotate, and the annular slide bar and slider I slide along the annular guide rail, which plays a guiding and limiting role on the extension frame, ensuring that the material tray assembly rotates smoothly.

[0038] The top of the annular guide rail has an opening, which corresponds to one of the extended frames;

[0039] A limiting block is provided inside the opening, and the limiting block is slidably sleeved on the corresponding slider I;

[0040] A cylinder I is fixedly connected to one side of the support frame I via a bracket, and the output end of the cylinder I is fixedly connected to the limiting block.

[0041] Among them, cylinder I drives the limit block to rise and fall, which in turn drives slider I and the extension frame to rise and fall synchronously, realizing the switching of the material tray assembly between the receiving position and the cleaning position.

[0042] The top of the extension frame, slider I, and limiting block each have two positioning holes.

[0043] The top of the ultrasonic cleaner is bolted with a positioning rod that matches a set of positioning holes.

[0044] When the extension frame is raised or lowered, the positioning rod is inserted into the positioning hole to prevent the slider I from disengaging from the limit block and improve the stability of the raising and lowering.

[0045] The material rack includes a column I, and multiple suspension rods are fixedly connected to the outer wall of the column I.

[0046] The inner wall of the feeding tray is provided with a rectangular opening for use with the suspension rod;

[0047] Two rubber gaskets are glued to the inner side of the opening end of the feeding tray to limit the position of the annular parts.

[0048] The suspension rod extends into the loading tray through a rectangular opening, and rubber pads prevent parts from slipping and ensure stable support of the parts.

[0049] The suspension rod includes a sleeve rod, which is fixed to the outer wall of column I;

[0050] A sliding rod is slidably provided inside the sleeve rod, and the outer end of the sliding rod is in the shape of an upward hook.

[0051] The inner wall of the feeding tray is fixed with multiple guide blocks that cooperate with the sliding rod by bolts;

[0052] The sleeve rod is equipped with a spring, and the two ends of the spring abut against the inner wall of one side of the sleeve rod and the inner end of the sliding rod, respectively.

[0053] The sliding rod slides along the guide block, and the spring provides cushioning for the sliding rod to ensure that the sliding rod stably hooks onto the components.

[0054] It also includes a drive disk, which is located inside the coating machine;

[0055] A column II is fixedly connected to the top of the drive disk, and a support disk is rotatably mounted on the top of the column II via a bearing.

[0056] The top of the support plate is provided with a rotating ring via a bearing, and both the rotating ring and the outer wall of the support plate are provided with U-shaped openings that are compatible with column I.

[0057] The top of the drive disk is provided with a drive shaft II, the top of the drive shaft II is provided with a plug, and the bottom of the column I is provided with a slot that matches the plug.

[0058] Among them, column I is placed on the support plate through a U-shaped opening, the insert block is inserted into the slot, and the drive plate drives column I to rotate synchronously to prepare for coating.

[0059] The top of column I is fixed with a clamping seat by bolts;

[0060] The bottom of the clamping seat and the top of the rotating ring are both provided with anti-slip texture;

[0061] Among them, the pneumatic chuck firmly clamps the material rack through the clamping seat, and the anti-slip texture prevents the material rack from sliding when rotating, ensuring the stability of the coating position of the parts.

[0062] The beneficial effects of this invention are as follows:

[0063] 1. The device relies on a PLC control system to precisely schedule core components such as the conveying device, conversion mechanism, and robotic arm, constructing a fully automated operation system of "parts conveying - cleaning - transfer - coating connection". From the automatic conveying of parts to the material tray assembly by the conveying device, to the conversion mechanism driving the material tray assembly to complete the cleaning position switching and immersion cleaning, and then to the robotic arm driving the material rack to realize the automatic gripping of parts and connection with the coating machine, the entire process does not require frequent manual intervention. On the one hand, it avoids the problems of placement deviation and falling damage that may occur when manually conveying parts, reducing the impact of human operation error on the quality of operation. On the other hand, it reduces the contact between operators and cleaning fluid and moving parts of equipment, reducing labor intensity and safety risks, while saving labor costs and improving the standardization and stability of the overall operation.

[0064] 2. The variable pitch component of the tray assembly can drive multiple trays to move away from each other, preventing the upper tray from being blocked by the lower tray. This ensures that all components in the trays are completely immersed in the cleaning solution of the ultrasonic cleaner, eliminating cleaning dead spots. It can also work with the material rack for automatic feeding. During the lifting and lowering of the tray assembly, the precise cooperation between the positioning hole and the positioning rod ensures that the tray assembly is stably immersed, preventing some components from not contacting the cleaning solution due to offset, and further ensuring the uniformity of cleaning.

[0065] 3. The device is equipped with two interchangeable tray assemblies. While one tray assembly is immersed in the ultrasonic cleaner for cleaning, the other tray assembly can automatically feed materials in conjunction with the material rack, realizing parallel "cleaning-feeding" operations. There is no need to wait for the previous tray assembly to complete cleaning and reset before the next round of feeding can begin, which greatly shortens the operation interval time. Attached Figure Description

[0066] Figure 1 This is a three-dimensional structural schematic diagram of a pre-cleaning device for an evaporative coating machine proposed in this invention;

[0067] Figure 2 This is a schematic diagram of the ultrasonic cleaner and conversion mechanism of a pre-cleaning device for an evaporation coating machine proposed in this invention;

[0068] Figure 3 This is a schematic diagram of the material tray assembly structure of a pre-cleaning device for an evaporation coating machine proposed in this invention;

[0069] Figure 4This is a schematic diagram of the feeding tray structure of a pre-cleaning device for an evaporation coating machine proposed in this invention;

[0070] Figure 5 This is a partial structural diagram of the conversion mechanism of a pre-cleaning device for an evaporation coating machine proposed in this invention;

[0071] Figure 6 This is a schematic diagram of the robotic arm and material rack structure of a pre-cleaning device for an evaporation coating machine proposed in this invention;

[0072] Figure 7 This is a cross-sectional view of the suspension rod structure of a pre-cleaning device for an evaporation coating machine proposed in this invention;

[0073] Figure 8 This is a schematic diagram of the drive disk and support disk structure of a pre-cleaning device for an evaporation coating machine proposed in this invention;

[0074] Figure 9 This is a schematic diagram of the material rack and drive disk structure of a pre-cleaning device for an evaporation coating machine proposed in this invention.

[0075] In the diagram: 1. Ultrasonic cleaning machine; 2. Conveying device; 3. Truss; 4. Robotic arm; 41. Pneumatic chuck; 5. Material rack; 51. Column I; 52. Suspension rod; 521. Sleeve rod; 522. Spring; 523. Sliding rod; 53. Clamping seat; 6. Support frame I; 7. Conversion mechanism; 71. Drive shaft I; 72. Support connecting rod; 73. Circular guide rail; 74. Base plate; 75. Circular slide bar; 76. Slider I; 77. Positioning hole; 78. Opening 79. Limiting block; 710. Cylinder I; 711. Positioning rod; 8. Material tray assembly; 81. Support frame II; 82. Cylinder II; 83. Extension frame; 84. Fixed base; 85. Guide rod; 86. Slider II; 87. Telescopic rail; 88. Feeding tray; 881. Rubber pad; 882. Rectangular opening; 883. Guide block; 9. Support plate; 91. Rotating ring; 92. U-shaped opening; 10. Drive plate; 100. Drive shaft II; 11. Column II. Detailed Implementation

[0076] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. It should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection", and "setting" should be interpreted broadly. For those skilled in the art, the specific meaning of the above terms in this patent can be understood according to the specific circumstances.

[0077] Reference Figures 1-9A pre-cleaning device for an evaporative coating machine is mainly used for cleaning parts before evaporative coating to ensure that there are no impurities remaining on the surface of the parts and improve the quality of subsequent coating. The core structure of the device includes an ultrasonic cleaner 1, a conveying device 2, a truss 3, a robotic arm 4, a pneumatic chuck 41, a material rack 5, a support frame I 6, a conversion mechanism 7, and two material tray assemblies 8. The various structures work together to complete the conveying, cleaning, and loading of parts. The entire process does not require frequent manual intervention and can achieve continuous operation, adapting to the cleaning needs of annular parts of different specifications.

[0078] The ultrasonic cleaner 1 serves as the core carrier for the cleaning operation. It is pre-filled with cleaning fluid, which can be industrial-grade anhydrous ethanol or a specialized metal cleaner. Care must be taken to avoid overflow during filling; the fluid level should be controlled to 2 / 3 of the internal height of the ultrasonic cleaner 1. This ensures that the subsequent tray assembly 8 completely covers the parts and prevents splashing during the raising and lowering of the tray assembly 8. Before use, check that the ultrasonic transducer of the ultrasonic cleaner 1 is functioning properly and that the ultrasonic frequency is stable to avoid incomplete cleaning due to transducer malfunction. The conveyor device 2 is located on one side of the ultrasonic cleaner 1. The conveyor device 2 uses a belt conveyor with a wear-resistant rubber surface. The rubber texture further increases friction with the parts, preventing slippage during transport, especially for smooth metal parts, effectively preventing misalignment. The conveying end of the conveyor device 2 is aligned with the receiving position of the tray assembly 8. During installation, the relative positions of the two devices must be repeatedly calibrated to ensure that the parts accurately fall into the tray assembly 8, preventing parts from falling outside the equipment.

[0079] Two tray assemblies 8 are used alternately to receive and clean parts, forming a "receive-clean-transfer" cycle. During switching, the movement trajectories of the two tray assemblies 8 do not interfere with each other, and the precise control of the conversion mechanism 7 ensures that they will not collide. The support frame I6 is fixed to the top of the ultrasonic cleaner 1 with bolts. The bolts must be tightened to prevent loosening after long-term use. The support frame I6 is made of stainless steel, which can effectively resist the corrosive gases generated by the evaporation of cleaning liquid, preventing the frame from rusting and affecting structural stability. The overall structure is rectangular, and the horizontal and vertical bars of the frame are fixed by welding. The welded joints must be ground to remove weld slag to prevent sharp parts from scratching operators or damaging other parts, ensuring structural stability and the ability to withstand the overall weight of the conversion mechanism 7 and the tray assembly 8. Even when the tray assembly 8 is fully loaded with parts, the frame will not deform significantly.

[0080] The conversion mechanism 7 is mounted on the support frame I6, and the tray assembly 8 is mounted on the conversion mechanism 7. The conversion mechanism 7 drives the tray assembly 8 to rotate and lift, switching the tray assembly 8 between the receiving position and the cleaning position. The rotation process must be smooth to avoid excessive speed causing the components inside the tray assembly 8 to shake or fall off; the lifting process must be slow and uniform to prevent the cleaning fluid from generating excessive foam due to violent movement, which would affect the cleaning effect. Simultaneously, the conversion mechanism 7 can drive the tray assembly 8 to be immersed in the cleaning fluid of the ultrasonic cleaner 1 for cleaning. During immersion, it must be ensured that the tray assembly 8 is completely submerged in the cleaning fluid, with no components exposed above the surface, ensuring uniform cleaning. The truss 3 is located on the other side of the ultrasonic cleaner 1. The truss 3 is made of aluminum alloy, which is lighter than stainless steel, reducing the load on the robotic arm 4 during movement, while providing sufficient strength to support the weight of the robotic arm 4 and the material rack 5. The top of the truss 3 is equipped with a linear guide rail. The surface of the guide rail needs to be regularly lubricated to reduce wear between the slider and the guide rail, extending its service life. The robotic arm 4 is connected to the linear guide rail via a slider and can move along the linear guide rail on the truss 3. The range of movement covers the area above the tray assembly 8 and the feed inlet of the coating machine. During the movement, it is necessary to avoid other equipment structures and to pre-set the movement path to prevent the robotic arm 4 from colliding with the support frame I6 or the tray assembly 8.

[0081] The end effector of the robotic arm 4 is equipped with a pneumatic chuck 41. The pneumatic chuck 41 employs a three-jaw chuck structure, allowing the three jaws to grip the material rack 5 from different directions, ensuring stable clamping. The clamping force of the chuck can be adjusted via air pressure, with a range of 0.3-0.6 MPa. When clamping a material rack 5 with a smaller diameter, the air pressure can be appropriately reduced to avoid damage due to excessive clamping force. When clamping a material rack 5 with a larger diameter or heavier weight, the air pressure needs to be increased to prevent the material rack 5 from falling off during movement. The air circuit of the pneumatic chuck 41 needs to be checked regularly to ensure there are no air leaks, preventing a sudden drop in air pressure during clamping that could cause the material rack 5 to fall. The material rack 5 is clamped within the pneumatic chuck 41, and through the multi-degree-of-freedom movement of the robotic arm 4, it is driven to move up and down within the material tray assembly 8. The lifting speed can be adjusted according to the fragility of the components. For easily deformable components, lifting and lowering should be done slowly to avoid violent collisions with the material tray assembly 8. The entire loading process requires no manual intervention, reducing human error and the risk of operators coming into contact with cleaning fluid, thus improving operational safety. Furthermore, the annular components automatically attach to the material rack 5 during the ascent.

[0082] The material tray assembly 8 includes an extension frame 83, a support frame II 81, multiple feeding trays 88, and a pitch-changing assembly. The extension frame 83 is mounted on the conversion mechanism 7. During installation, it must be ensured that the connection between the two is tight and without any loose gaps to prevent the extension frame 83 from shaking during rotation and lifting. One side of the extension frame 83 is fixed to the support frame II 81 by welding. The weld joint needs to be inspected for flaws to ensure that the weld strength meets the standards. The support frame II 81 is also made of stainless steel and has an L-shaped structure. Multiple feeding trays 88 are evenly distributed on one side. The feeding trays 88 are annular, with one end open and the other end sealed. The opening faces the end of the conveying device 2 to facilitate the receipt of conveyed parts. The edges of the opening need to be rounded to prevent parts from being scratched by sharp edges when falling in.

[0083] A pitch-changing assembly is located on one side of the support frame II 81 and is used to drive multiple loading trays 88 to move closer or further apart. Its operation must be coordinated with the lifting and lowering motion of the tray assembly 8. When the tray assembly 8 needs to be immersed in the cleaning solution, the pitch-changing assembly moves the multiple loading trays 88 closer together, reducing the distance between them. This ensures that the parts in the upper loading tray 88 are completely immersed in the cleaning solution, preventing the upper parts from being blocked by the lower loading tray 88 due to excessive distance, thus affecting the cleaning effect. After the tray assembly 8 completes cleaning and rises, the pitch-changing assembly drives the multiple loading trays 88 to move further apart, increasing the distance between them. This allows the robotic arm 4 to simultaneously move the material rack 5 to transfer the parts in the multiple loading trays 88, reducing the number of transfers. The pitch-changing assembly includes two fixed bases 84, two guide rods 85, multiple sliders II 86, cylinders II 82, and telescopic railings 87. The two fixed bases 84 are bolted to one side of the support frame II 81 and are symmetrically distributed. The bolts must be made of corrosion-resistant material to prevent rust from long-term contact with the volatile gases of the cleaning solution. Two guide rods 85 are fixed in parallel between two fixed bases 84. The guide rods 85 are made of chrome-plated round rods. The chrome plating layer can enhance the surface wear resistance and rust prevention. The surface is smooth, which reduces the friction when the slider II 86 slides, ensuring that the slider II 86 moves smoothly without jamming.

[0084] Multiple sliders II86 are slidably mounted on the outer walls of two guide rods 85. The number of sliders II86 matches the number of feeding trays 88. Each slider II86 is fixedly connected to a feeding tray 88 on one side using bolts, facilitating subsequent replacement or maintenance of the feeding trays 88. A cylinder II82 is installed on one side of the support frame II81. The installation position of the cylinder II82 must ensure that its output end can precisely align with the upper slider II86. After bolt fixing, the extension and retraction of the cylinder II82 must be tested to ensure smooth movement of the slider II86. Multiple sliders II86 are connected by telescopic railings 87. The telescopic railings 87 employ a multi-section telescopic structure, extending and retracting synchronously with the movement of the sliders II86. A flexible clearance must be maintained between the sections of the telescopic railings 87 to prevent jamming. When the piston rod of cylinder II 82 extends, it pushes the upper slider II 86 downward along the guide rod 85. Through the transmission effect of the telescopic bar 87, it drives the other sliders II 86 to move synchronously, so that multiple sliders II 86 move closer to each other, and in turn, it drives multiple feeding trays 88 to move closer to each other. Throughout the process, the moving distance of each slider II 86 remains consistent, ensuring that the spacing of the feeding trays 88 is uniform. When the piston rod of cylinder II 82 retracts, it pulls the upper slider II 86 upward along the guide rod 85. Through the telescopic bar 87, it drives the other sliders II 86 to move away from each other, realizing the adjustment of the spacing of the feeding trays 88. After the adjustment is completed, cylinder II 82 maintains its current state to prevent sliders II 86 from moving on their own during cleaning or transfer.

[0085] The conversion mechanism 7 includes a drive shaft I 71, a base plate 74, an annular slide bar 75, two sliders I 76, an annular guide rail 73, and multiple support rods 72. The drive shaft I 71 is rotatably mounted between the support frame I 6 and the ultrasonic cleaner 1 via bearings. High-precision deep groove ball bearings must be selected to ensure the coaxiality of the drive shaft I 71 during rotation and reduce radial runout. The bottom end of the drive shaft I 71 is connected to a drive motor, which is a stepper motor. Stepper motors have high control precision and can accurately control the rotation angle of the drive shaft I 71, ensuring that the tray assembly 8 can accurately stop above the receiving or cleaning position. The drive motor drives the drive shaft I 71 to rotate. The motor and the drive shaft I 71 are connected by a coupling. The coupling must have a certain buffering performance to reduce the impact on the drive shaft I 71 when the motor starts and stops. The base plate 74 is fixedly sleeved on the outer wall of the drive shaft I 71 by welding to ensure that the base plate 74 can rotate synchronously with the drive shaft I 71 without relative sliding. The base plate 74 is made of circular steel plate with a precision-machined surface to ensure flatness and prevent tilting of the extension frame 83 after installation due to uneven surface. Both extension frames 83 are inserted into the base plate 74 and symmetrically distributed on both sides of the drive shaft I 71. During installation, it is necessary to ensure that the height of the two extension frames 83 is consistent to prevent the center of gravity from shifting during rotation, which would cause instability in the operation of the conversion mechanism 7.

[0086] The annular slide bar 75 is fixed to the top of the base plate 74 by bolts. The bolts must be tightened evenly to prevent deformation of the annular slide bar 75 after installation. The center of the annular slide bar 75 coincides with the axis of the drive shaft I 71, ensuring that the annular slide bar 75 can rotate concentrically with the drive shaft I 71. Two sliders I 76 are positioned between the two annular slide bars 75 and are fixedly connected to the top of the two extension frames 83 respectively. The two sliders I 76 and the annular slide bar 75 cooperate to form a complete circular structure. The diameter of this circular structure is adapted to the inner diameter of the annular guide rail 73, ensuring that the sliders I 76 can slide smoothly within the annular guide rail 73. The annular guide rail 73 is slidably fitted onto the outer wall of the annular slide bar 75 and the sliders I 76. The annular guide rail 73 is fixedly connected to the support frame I 6 by multiple support rods 72. The support rods 72 are evenly distributed on the outer side of the annular guide rail 73, usually 4-6, to ensure that the annular guide rail 73 is fixed firmly and without shaking. When the drive shaft I 71 drives the base plate 74 to rotate, the annular slide bar 75 rotates synchronously with the base plate 74, and the slider I 76 slides in the annular guide rail 73. The annular guide rail 73 guides and limits the slider I 76, preventing the extension frame 83 from shifting during rotation and ensuring rotation accuracy. Even when the tray assembly 8 is fully loaded, the rotation process can be ensured to be stable.

[0087] An opening 78 is provided at the top of the annular guide rail 73. The position of the opening 78 corresponds to one of the rotated extension frames 83. A limiting block 79 is set inside the opening 78 and sleeved on the corresponding slider I 76. The inner wall of the limiting block 79 fits tightly with the outer wall of the slider I 76 without any obvious gap, ensuring that the limiting block 79 can drive the slider I 76 to rise and fall synchronously. A cylinder I 710 is fixedly installed on one side of the support frame I 6 by a bracket. The bracket must have sufficient strength to prevent the cylinder I 710 from shaking during the extension and retraction process. The output end of the cylinder I 710 is fixedly connected to the limiting block 79 by bolts. After connection, the extension and retraction of the cylinder I 710 must be tested to ensure that it is smooth and without jamming. When the extension frame 83 needs to be driven down, the piston rod of cylinder I 710 extends, pushing the limit block 79 to move downward. The limit block 79 drives the slider I 76 and the extension frame 83 to descend synchronously. The descent speed must be slow to prevent the tray assembly 8 from being quickly immersed in the cleaning fluid and generating a large number of bubbles, which would affect the cleaning effect, and to avoid the cleaning fluid from splashing out. After cleaning is completed, the piston rod of cylinder I 710 retracts, pulling the limit block 79 and the extension frame 83 upward to return to the initial position. During the ascent, it is necessary to ensure that the tray assembly 8 is completely detached from the cleaning fluid to prevent the cleaning fluid from dripping onto other parts of the equipment.

[0088] The top of the extension frame 83, slider I 76, and limiting block 79 each has two positioning holes 77. The positioning holes 77 must be precisely aligned to ensure that the positioning rod 711 can be smoothly inserted when the extension frame 83 is raised or lowered. The top of the ultrasonic cleaner 1 is fixed with a positioning rod 711 by bolts. The diameter of the positioning rod 711 matches the diameter of the positioning hole 77, with an error controlled within ±0.1mm, ensuring that the positioning rod 711 can be easily inserted into the positioning hole 77 without excessive gap, thus ensuring the limiting effect. When the extension frame 83 is raised or lowered, the positioning rod 711 is inserted into the positioning hole 77 to limit the raising or lowering direction of the extension frame 83, preventing the extension frame 83 from shifting laterally due to the resistance of the cleaning fluid or uneven weight distribution during the raising or lowering process, preventing slider I 76 from disengaging from the limiting block 79, and ensuring the stability of the raising or lowering process. The surface of the positioning rod 711 must be smooth to avoid jamming when inserted into the positioning hole 77. At the same time, the length of the positioning rod 711 must be sufficient to ensure that when the extension frame 83 is lowered to the lowest position, the positioning rod 711 can still remain partially in the positioning hole 77 and continue to play a limiting role.

[0089] The material rack 5 includes a column I 51 and multiple suspension rods 52. The column I 51 is made of cylindrical stainless steel with a polished surface to reduce resistance during component transfer. Multiple suspension rods 52 are evenly distributed on the outer wall of the column I 51 to ensure even suspension of components, preventing contact between them. This even distribution also keeps the center of gravity of the material rack 5 centered, preventing tilting during gripping by the robotic arm 4. A rectangular opening 882 is provided on the inner wall of the loading tray 88. The size of the rectangular opening 882 matches the cross-sectional dimensions of the suspension rods 52, ensuring smooth passage. After the annular component is loaded, the aperture of the annular component corresponds to the rectangular opening 882. When the material rack 5 moves upward from the tray assembly 8, the suspension rods 52 detach from the loading tray 88 through the rectangular opening 882, facilitating the receiving and transfer of components. The insertion process must be slow to avoid collisions between the suspension rods 52 and the inner wall of the loading tray 88, which could damage the components or the loading tray 88.

[0090] Two rubber gaskets 881 are fixed to the inner side of the open end of the feeding tray 88 with adhesive. The adhesive must be a high-temperature resistant and corrosion-resistant industrial adhesive to ensure that the rubber gaskets 881 can be fixed for a long time and will not fall off due to soaking in cleaning fluid or temperature changes. The rubber gaskets 881 are made of nitrile rubber, which has good elasticity and wear resistance. When the parts fall from the conveying device 2 into the feeding tray 88, the rubber gaskets 881 can limit the parts and prevent them from slipping from the open end during cleaning, thus limiting the annular parts. The suspension rod 52 includes a sleeve rod 521, a sliding rod 523, and a spring 522. The sleeve rod 521 is fixed to the outer wall of the column I 51 by welding. The weld joint must be ground smooth to avoid sharp parts scratching the parts. The inside of the sleeve rod 521 is hollow, and the size of the hollow part is adapted to the size of the sliding rod 523 to ensure that the sliding rod 523 can slide smoothly inside the sleeve rod 521. The sliding rod 523 is slidably disposed inside the sleeve rod 521. The outer end of the sliding rod 523 is in the shape of an upward hook, which makes it easy to hook the parts. The end of the hook needs to be rounded to prevent scratching the surface when hooking the parts.

[0091] Multiple guide blocks 883 are bolted to the inner wall of the feeding tray 88. The installation position of the guide blocks 883 must be aligned with the movement trajectory of the sliding rod 523 to ensure that when the material rack 5 moves the sliding rod 523 into the feeding tray 88, the sliding rod 523 can move smoothly along the guide blocks 883, avoiding deviation or jamming. The guide blocks 883 are made of polytetrafluoroethylene (PTFE), which not only has a smooth surface to reduce friction with the sliding rod 523, but also has good corrosion resistance and will not be damaged even after long-term contact with cleaning fluid. The number of guide blocks 883 must correspond one-to-one with the number of sliding rods 523. Each guide block 883 has an inclined guide surface machined on one side, with the inclination angle set at 15-30°. When the sliding rod 523 approaches, it can naturally slide into the correct movement path through the guide surface. Even if there is a slight positional deviation of the material rack 5, precise docking can be achieved through the guidance of the guide blocks 883.

[0092] A spring 522 is installed inside the sleeve rod 521. The two ends of the spring 522 abut against the inner wall of one side of the sleeve rod 521 and the inner end of the sliding rod 523, respectively. In its natural state, the spring 522 is slightly compressed, which pushes the sliding rod 523 to remain extended, ensuring that the hook end of the sliding rod 523 can smoothly hook onto the parts. When the sliding rod 523 moves under the guidance of the guide block 883 and encounters slight obstruction from the inner wall of the feeding tray 88, the spring 522 can be further compressed, providing a buffer for the sliding rod 523 and preventing rigid collisions that could damage the parts or the sliding rod 523. When the obstruction disappears, the spring 522 can quickly return to its original position, pushing the sliding rod 523 back to its extended state, ensuring stable hooking of the parts. The spring 522 must be made of stainless steel to prevent rusting in a humid environment, which would affect its elasticity. The length of the spring 522 must also match the internal length of the sleeve rod 521 to ensure that the spring 522 is not over-compressed when the sliding rod 523 is fully retracted, thus extending the spring's service life.

[0093] The device also includes a drive disk 10 installed inside the coating machine. During installation, the drive disk 10 must be precisely aligned with the transmission system of the coating machine to ensure that it rotates synchronously with the transmission system without significant radial runout. A column II 11 is bolted to the top of the drive disk 10. The column II 11 must be positioned near the central axis of the drive disk 10 to ensure that the support disk 9 can rotate around the center of the drive disk 10 after installation, preventing center of gravity shift. The support disk 9 is bolted to the top of the column II 11. A rotating ring 91 is rotatably mounted on the top of the support disk 9 via a bearing. The bearing between the rotating ring 91 and the support disk 9 must be properly sealed and have sufficient resistance to prevent it from rotating on its own without external force.

[0094] Both the rotating ring 91 and the support plate 9 have U-shaped openings 92 on their outer walls. The openings of the U-shaped openings 92 must face outwards to allow the upright column I 51 of the material rack 5 to be smoothly inserted through the openings. The inner walls of the U-shaped openings 92 need to be polished to remove burrs and sharp edges to prevent the upright column I 51 from being scratched during insertion. The depth of the U-shaped openings 92 needs to be slightly greater than the diameter of the upright column I 51 to ensure that the upright column I 51 can be stably supported on the support plate 9 after insertion and will not slip out of the opening. When the material rack 5 is transferred into the coating machine by the robotic arm 4, the robotic arm 4 needs to first adjust the angle of the material rack 5 so that the upright column I 51 is aligned with the U-shaped opening 92, and then slowly lower it to place the upright column I 51 into the U-shaped opening 92. The entire process must be kept smooth to avoid collision between the upright column I 51 and the edge of the U-shaped opening 92.

[0095] The top of the drive disc 10 is equipped with a drive shaft II 100, the top of which is equipped with a plug. The bottom of the column I 51 is equipped with a slot that matches the plug, ensuring that when the drive shaft II 100 rotates, it can drive the column I 51 and the material rack 5 to rotate synchronously, avoiding relative slippage. The depth of the slot must match the length of the plug to ensure the stability of the connection.

[0096] The top of the column I 51 is bolted with a clamping seat 53. The clamping seat 53 has a circular or regular hexagonal cross-section. This shape allows the three jaws of the pneumatic chuck 41 to be evenly stressed from multiple directions, ensuring a stable clamping. At the same time, the regular hexagonal structure also facilitates the quick positioning of the pneumatic chuck 41, reducing adjustment time during clamping. The top of the clamping seat 53 needs to be machined into a flat surface to facilitate the contact of the jaws of the pneumatic chuck 41. The bottom of the clamping seat 53 and the top of the rotating ring 91 are both provided with anti-slip textures. The anti-slip textures adopt a cross-grid pattern, which can greatly increase the friction between the clamping seat 53 and the rotating ring 91. When the material rack 5 is placed on the support plate 9 and the drive shaft II 100 drives it to rotate, even if it is affected by the airflow in the coating machine or other slight external forces, it can prevent the material rack 5 from sliding, ensuring the stability of the parts during the coating process.

[0097] During daily use, the device requires regular maintenance. For the ultrasonic cleaner 1, the cleaning solution should be changed weekly to prevent excessive impurities from affecting the cleaning effect. Additionally, the interior of the ultrasonic cleaner 1 should be cleaned regularly to prevent residue buildup and blockage of the ultrasonic transducers. The conveyor belt 2 should be inspected monthly for wear or cracks. If any problems are found, it should be replaced immediately. The belt surface should also be cleaned regularly to maintain friction. The linear guide rail of the robotic arm 4 should be lubricated every two weeks. Before lubrication, the surface of the guide rail should be cleaned of dust and impurities to ensure even coverage. The air circuit of the pneumatic chuck 41 should be inspected monthly for aging or leaks in the air pipes and for proper functioning of the air valves. Any problems should be addressed by replacing the affected components immediately.

[0098] In actual operation, the device also requires a corresponding control system. This control system uses a PLC controller to achieve precise control and coordinated operation of each component. The control system allows for pre-setting parameters such as cleaning time, rotation angle of the material tray assembly 8, and movement path of the robotic arm 4. Operators can easily set these parameters and start / stop the equipment via a touchscreen. The control system also features a fault alarm function. When abnormal conditions occur, such as low liquid level in the ultrasonic cleaner 1, insufficient air pressure in the pneumatic chuck 41, or deviation in the movement trajectory of the robotic arm 4, the control system will promptly issue an audible and visual alarm and display the cause of the fault on the touchscreen. This facilitates quick troubleshooting and problem-solving by operators, reducing equipment downtime.

[0099] In addition, the outer casing of the device must be made of stainless steel, and an observation window made of tempered glass must be provided on the casing to facilitate operators' observation of the internal working conditions of the equipment. The observation window must also be equipped with a sealing strip to prevent leakage of gases generated by the evaporation of cleaning fluid. An access door must be provided on the side of the casing, connected to the casing by hinges, and equipped with a lock to facilitate operators opening the access door for inspection and repair of internal components during equipment maintenance. Casters with brakes must be installed at the bottom of the casing to facilitate the movement and position adjustment of the equipment, and to secure the equipment during operation by braking, preventing movement that could affect working accuracy.

[0100] Working principle: Start the conveying device 2 to transport the parts to be cleaned from the initial placement position to one side of the ultrasonic cleaner 1.

[0101] Meanwhile, the drive motor first performs a self-check, and starts after confirming that there are no abnormalities. It drives the drive shaft I 71 to rotate slowly. The drive shaft I 71 transmits the rotational force to the material tray assembly 8 through the base plate 74, causing the material tray assembly 8 to rotate synchronously until it stops precisely at the end receiving position of the conveying device 2. At this time, the opening end of the upper tray 88 of the material tray assembly 8 is accurately facing the conveying device 2, ensuring that the parts can fall in smoothly.

[0102] Subsequently, the pitch-changing component of the tray assembly 8 is activated. After receiving the signal, the piston rod of the pitch-changing component's cylinder II 82 slowly extends, pushing the upper slider II 86 downward along the guide rod 85. Since the multiple sliders II 86 are connected by the telescopic railing 87, when the upper slider II 86 moves, it will drive the other sliders II 86 to move synchronously through the telescopic railing 87, so that the multiple loading trays 88 move closer to each other, reducing the distance between adjacent loading trays 88, and preventing parts from shifting or falling due to excessive distance when they fall in.

[0103] When the parts are conveyed to the end of the conveyor device 2 by the belt, they slide smoothly off the belt under the continuous conveying force and fall into the corresponding loading tray 88 below. The rubber gasket 881 limits the movement of the parts and prevents them from slipping off the open end during subsequent movement.

[0104] Once all the feeding trays 88 of a material tray assembly 8 are full of parts, the sensor next to the feeding tray 88 will detect that the tray is full and send a signal to the control system. The control system will then send a command to the conversion mechanism 7 to start the cleaning process.

[0105] The cylinder I710 on one side of the support frame I6 receives a command from the control system, and the piston rod slowly extends, pushing the limit block 79 downward. Since the limiting block 79 is fitted on the slider I 76 and fits tightly with it, the limiting block 79 will drive the slider I 76 to move downward synchronously. The slider I 76 is fixedly connected to the extension frame 83, which in turn drives the extension frame 83 and the entire tray assembly 8 to slowly descend, so that the upper loading tray 88 moves to the end of the conveying device 2 to receive materials in sequence until all the loading trays 88 on one side have received the parts. Then, the cylinder I 710 continues to extend. During the descent, the positioning holes 77 on the top of the extension frame 83, slider I 76 and limiting block 79 will precisely cooperate with the positioning rod 711 on the top of the ultrasonic cleaner 1. The positioning rod 711 gradually inserts into the positioning hole 77, which plays a strict limiting role in the descent direction of the tray assembly 8, preventing the tray assembly 8 from shifting laterally due to the resistance of the cleaning fluid or uneven weight distribution, and ensuring that the tray assembly 8 can be stably and vertically immersed in the cleaning fluid of the ultrasonic cleaner 1.

[0106] Once the tray assembly 8 is completely submerged in the cleaning solution, cylinder I 710 stops operating and remains in its current state. Subsequently, the ultrasonic cleaner 1 starts, and its internal ultrasonic transducer begins to operate, generating high-frequency vibrations. These high-frequency vibrations are transmitted to the cleaning solution, causing a large number of tiny bubbles to form within it. These tiny bubbles continuously grow and contract under the influence of vibration, eventually bursting. The bursting of these bubbles generates a strong impact force that acts on the surface of the parts, peeling off impurities, oil, and other contaminants adhering to the surface, thus cleaning the parts. After cleaning is complete, cylinders I 710 and II 82 are sequentially activated to reset and move.

[0107] After a complete reset, the drive motor of the conversion mechanism 7 restarts, driving the drive shaft I 71 to rotate. The drive shaft I 71 drives the tray assembly 8 to rotate synchronously via the base plate 74. During rotation, the annular slide bar 75 on the top of the base plate 74 rotates together with the base plate 74, and the slider I 76 slides smoothly within the annular guide rail 73. The annular guide rail 73 is fixed to the support frame I 6 via the support connecting rod 72, which guides and limits the slider I 76, ensuring that the tray assembly 8 does not shift laterally during rotation and maintains a stable rotation trajectory. This allows the other tray assembly 8 to move precisely above the ultrasonic cleaner 1 and to the end receiving position of the conveying device 2 to begin receiving new parts.

[0108] After the cleaned tray assembly 8 reaches the parts transfer position, the control system sends a command to the robotic arm 4 on the truss 3 to start the transfer process. The robotic arm 4 first performs a self-check, checking whether the movement of each joint is smooth and whether the pneumatic chuck 41 is working properly. After confirming that there are no abnormalities, it moves smoothly along the linear guide rail at the top of the truss 3. During the movement, the robotic arm 4 will avoid other equipment structures and move precisely to directly above the tray assembly 8 according to the preset movement path.

[0109] Before moving, the pneumatic chuck 41 at the end of the robotic arm 4 pre-grips the material rack 5. The three jaws of the pneumatic chuck 41 are evenly attached to the outer wall of the clamping seat 53 at the top of the material rack 5. By adjusting the clamping force, it is ensured that the material rack 5 is firmly clamped without damaging it due to excessive clamping force. After the robotic arm 4 reaches directly above the tray assembly 8, it begins to adjust its posture and drives the material rack 5 to descend slowly through the coordinated movement of its joints.

[0110] During the descent of the material rack 5, the suspension rod 52 of the material rack 5 moves from above to below the loading tray 88. During this process, the sliding rod 523 of the suspension rod 52 first contacts the guide block 883 on the inner wall of the loading tray 88. The inclined guide surface of the guide block 883 guides the sliding rod 523, allowing it to move smoothly along the guide surface and preventing collisions between the sliding rod 523 and the inner wall of the loading tray 88. The sliding rod 523 then retracts into the sleeve rod 521, simultaneously compressing the spring 522 inside the sleeve rod 521. The compression of the spring 522 provides cushioning for the sliding rod 523, preventing a rigid collision between the sliding rod 523 and the loading tray 88. When the sliding rod 523 passes the blocking part, the spring 522 will quickly return to its original position, pushing the sliding rod 523 to extend out of the sleeve rod 521, and starting the robotic arm 4 to control the material rack 5 to rotate, so that the sliding rod 523 moves to below the rectangular opening 882. Then, the robotic arm 4 controls the material rack 5 to move upward. During this process, the hook end of the sliding rod 523 will accurately hook the parts, achieving stable gripping of the parts.

[0111] Once all the sliding rods 523 of the suspension rods 52 have hooked onto their corresponding parts, the robotic arm 4 begins to slowly raise the material rack 5. During the ascent, the sliding rods 523 lift the parts along with the material rack, causing them to detach from the loading tray 88. The ascent speed is kept steady to prevent the parts from wobbling or falling off the sliding rods 523 due to excessive speed. After the material rack 5 reaches a safe height, the robotic arm 4 stops rising and prepares to move towards the coating machine.

[0112] Upon reaching the feed inlet of the coating machine, the robotic arm 4 first adjusts the angle of the material rack 5. Through subtle movements of each joint, it precisely aligns the upright column I 51 of the material rack 5 with the U-shaped opening 92 on the outer wall of the inner support plate 9 and rotating ring 91 of the coating machine. After alignment, the robotic arm 4 slowly lowers the material rack 5, placing the upright column I 51 onto the support plate 9 through the U-shaped opening 92.

[0113] As the column I51 descends, the slot at the bottom of the column I51 gradually approaches the plug of the drive shaft II100 at the top of the drive disk 10. When the column I51 is fully placed on the support disk 9, the slot will precisely insert into the plug to ensure that the subsequent rotation of the drive disk 10 can drive the column I51 to rotate synchronously.

[0114] After column I 51 is placed, the pneumatic chuck 41 receives a command from the control system, and the three jaws gradually release, disengaging from the gripper 53. Subsequently, the robotic arm 4 slowly rises and returns to its initial position along the original path, ready for the next parts transfer operation.

[0115] In this application, the structures and connections not described in detail are all prior art, and their structures and principles are well known, so they will not be described in detail here.

[0116] The above description is only a preferred embodiment of the present invention, but 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 inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pre-cleaning device for an evaporative coating machine, characterized in that, include: Ultrasonic cleaning machine (1); Conveying device (2), which is fixedly installed on one side of ultrasonic cleaner (1) and used to convey parts to be cleaned; Two tray assemblies (8) are located above the ultrasonic cleaner (1) and used alternately to cooperate with the conveying device (2) to receive parts; Support frame I (6) is bolted to the top of the ultrasonic cleaner (1); The conversion mechanism (7) is rotatably mounted on the support frame I (6), and the tray assembly (8) is fixedly connected to the conversion mechanism (7). Truss (3), the truss (3) is located on the side of the ultrasonic cleaner (1) away from the conveying device (2); The robotic arm (4) is slidably mounted on the truss (3) via a slider, and a pneumatic chuck (41) is fixed to its end. Material rack (5), which is clamped in pneumatic chuck (41) and cooperates with material tray assembly (8); Among them, the conversion mechanism (7) drives the material tray assembly (8) to rotate and switch to the end of the conveying device (2) to receive the parts, and then drives the material tray assembly (8) to be immersed in the ultrasonic cleaner (1) to clean the parts. The robotic arm (4) drives the material rack (5) to rise and fall in the material tray assembly (8) to realize the automatic transfer of parts and reduce manual intervention. The tray assembly (8) includes: An extension frame (83) is inserted into a conversion mechanism (7). Support frame II (81), which is fixed to one side of extension frame (83) by welding; Multiple feeding trays (88) are annular with one end open and the other end sealed, and are fixed to one side of the support frame II (81); A pitch control assembly, wherein the pitch control assembly is disposed on one side of the support frame II (81); Among them, the variable pitch component drives multiple feeding trays (88) to move closer or further away from each other, so as to avoid the upper feeding tray (88) from blocking the lower feeding tray (88), and ensure that all the parts in the feeding tray (88) can be immersed in the cleaning liquid of the ultrasonic cleaner (1), thereby improving the cleaning uniformity. The pitch control component includes: Two fixed bases (84) are symmetrically fixed to one side of the support frame II (81) by bolts; Two guide rods (85) are fixedly connected in parallel between two fixed bases (84); Multiple sliders II (86) are slidably sleeved on the outer wall of two guide rods (85), and a feeding tray (88) is fixed to one side of the sliders II (86) and the lower guide rods (85); Cylinder II (82), which is fixed to one side of support frame II (81) by a bracket, and its output end is fixed to the upper slider II (86); Telescopic bar (87), which is connected between multiple sliders II (86); Among them, cylinder II (82) drives the upper slider II (86) to slide along the guide rod (85), and drives the other sliders II (86) to move synchronously through the telescopic rail (87), so as to achieve precise adjustment of the spacing of the feeding tray (88).

2. The pre-cleaning device for an evaporative coating machine according to claim 1, characterized in that, The conversion mechanism (7) includes: Drive shaft I (71) is rotatably mounted between support frame I (6) and ultrasonic cleaner (1) via bearings; The base plate (74) is fixed to the outer wall of the drive shaft I (71) by a key connection, and the extension frame (83) is inserted into the base plate (74). An annular slide bar (75) is bolted to the top of the base plate (74), and its center coincides with the axis of the drive shaft I (71). Two sliders I (76) are fixed to the top of two extension frames (83) respectively, forming a complete circle with the annular slider (75); The annular guide rail (73) is fixed to the support frame I (6) by multiple support rods (72), and the annular slide bar (75) and the slider I (76) are slidably embedded in the inner wall of the annular guide rail (73). Among them, the drive shaft I (71) drives the base plate (74) to rotate, and the annular slide bar (75) and the slider I (76) slide along the annular guide rail (73) to guide and limit the extension frame (83) and ensure that the material tray assembly (8) rotates smoothly.

3. The pre-cleaning device for an evaporative coating machine according to claim 2, characterized in that, The top of the annular guide rail (73) is provided with an opening (78), which corresponds to one of the extension frames (83); The opening (78) is provided with a limiting block (79), which is slidably sleeved on the corresponding slider I (76); A cylinder I (710) is fixedly connected to one side of the support frame I (6) by a bracket, and the output end of the cylinder I (710) is fixedly connected to the limiting block (79). Among them, cylinder I (710) drives the limit block (79) to rise and fall, which in turn drives slider I (76) and extension frame (83) to rise and fall synchronously, so as to realize the switching of the material tray assembly (8) between the receiving position and the cleaning position.

4. The pre-cleaning device for an evaporative coating machine according to claim 3, characterized in that, The top of the extension frame (83), slider I (76) and the limiting block (79) each have two positioning holes (77). The top of the ultrasonic cleaner (1) is fixed with a positioning rod (711) that is compatible with a set of positioning holes (77) by bolts. When the extension frame (83) is raised or lowered, the positioning rod (711) is inserted into the positioning hole (77) to prevent the slider I (76) from disengaging from the limit block (79) and improve the stability of the raising and lowering.

5. The pre-cleaning device for an evaporative coating machine according to claim 4, characterized in that, The material rack (5) includes a column I (51), and a plurality of suspension rods (52) are fixed to the outer wall of the column I (51). The inner wall of the feeding tray (88) is provided with a rectangular opening (882) that is used in conjunction with the suspension rod (52). Two rubber gaskets (881) are glued to the inner side of the opening end of the feeding tray (88) to limit the position of the annular parts; Among them, the suspension rod (52) extends into the loading tray (88) through the rectangular opening (882), and the rubber pad (881) prevents the parts from slipping and ensures that the parts are stably supported.

6. The pre-cleaning device for an evaporative coating machine according to claim 5, characterized in that, The suspension rod (52) includes a sleeve rod (521), which is fixed to the outer wall of the column I (51); The sleeve rod (521) is slidably provided with a sliding rod (523), and the outer end of the sliding rod (523) is in the shape of an upward hook. The inner wall of the feeding tray (88) is fixed with a plurality of guide blocks (883) that cooperate with the sliding rod (523) by bolts. The sleeve rod (521) is provided with a spring (522), and the two ends of the spring (522) abut against the inner wall of one side of the sleeve rod (521) and the inner end of the sliding rod (523), respectively. The sliding rod (523) slides along the guide block (883), and the spring (522) provides a buffer for the sliding rod (523) to ensure that the sliding rod (523) stably hooks the parts.

7. The pre-cleaning device for an evaporative coating machine according to claim 6, characterized in that, It also includes a drive disk (10), which is disposed inside the coating machine; The top of the drive disk (10) is fixedly connected to a column II (11), and the top of the column II (11) is provided with a support disk (9) through a bearing. The top of the support plate (9) is provided with a rotating ring (91) via a bearing. Both the rotating ring (91) and the outer wall of the support plate (9) are provided with U-shaped openings (92) that are adapted to the column I (51). The top of the drive disk (10) is provided with a drive shaft II (100), the top of the drive shaft II (100) is provided with a plug, and the bottom of the column I (51) is provided with a slot that matches the plug. Among them, column I (51) is placed on support plate (9) through U-shaped opening (92), insert block is inserted into slot, drive plate (10) drives column I (51) to rotate synchronously, in preparation for coating.

8. The pre-cleaning device for an evaporative coating machine according to claim 7, characterized in that, The top of the column I (51) is fixed with a clamping seat (53) by bolts; The bottom of the clamping seat (53) and the top of the rotating ring (91) are both provided with anti-slip texture; Among them, the pneumatic chuck (41) firmly clamps the material rack (5) through the clamping seat (53), and the anti-slip texture prevents the material rack (5) from sliding when rotating, ensuring the stability of the coating position of the parts.

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