Device for uniform coating on both the inner and outer sides of small-diameter parts

Abstract

This utility model discloses a device for uniform coating of small-diameter parts on both the inner and outer sides, relating to the field of coating technology for small-diameter parts. It includes a coating machine, a bottom shell, and a top shell for processing small-diameter parts. The bottom shell is located on top of the coating machine and is fixedly connected to the top of the machine. The top shell is located on top of the bottom shell and is inserted and fitted into the top of the bottom shell. Assembly mechanisms for cooperation with the top shell are provided on both the left and right sides of the top shell. This utility model, through the coordinated arrangement of the coating machine, bottom shell, top shell, assembly mechanism, lifting mechanism, and transmission mechanism, solves the problem that while uniformly coating small-diameter parts using the coating machine, it is necessary to evenly place the small-diameter parts inside the coating shell. However, after uniformly coating the small-diameter parts through the coating shell, manual mold opening is required, which is cumbersome and inconvenient for users to quickly open, close, assemble, and remove materials from the coating shell.

Description

Technical Field

[0001] This utility model relates to the field of coating technology for small-diameter parts, specifically a device for uniform coating on both the inner and outer sides of small-diameter parts. Background Technology

[0002] Small-aperture parts (such as precision bearings, hydraulic valve cores, and aerospace sensor housings) are widely used in high-end manufacturing, medical devices, semiconductors, and other fields. Their apertures are typically smaller than a specific size, and high-precision coatings must be applied to both the inner and outer surfaces to meet performance requirements such as wear resistance, corrosion resistance, conductivity, or insulation.

[0003] A double-sided uniform coating apparatus for small-aperture parts is a specialized device designed to achieve uniform coating on the inner and outer walls of small-aperture parts. This apparatus typically combines advanced coating technology with a precise mechanical structure to ensure high efficiency and uniformity in the coating process. It employs high-power pulsed magnetron sputtering technology, combined with pulsed bias power supply and pulse synchronization with the magnetron cathode target, to achieve free control over the metal ion flow rate and energy. During the coating process, the high-power pulsed power supply generates ultra-high-density plasma to ionize the metal target, obtaining plasma with a high ionization rate. Metal ions bombard the surface of a workpiece under the acceleration of an electric field, forming a uniform coating. In summary, the double-sided uniform coating device for small-diameter parts is a highly efficient, uniform, flexible, and automated specialized equipment suitable for the double-sided coating needs of small-diameter parts. While uniformly coating small-diameter parts using a coating machine, the small-diameter parts need to be evenly placed inside the coating housing. However, after uniformly coating the small-diameter parts through the coating housing, manual mold opening is required, which is a cumbersome process and inconvenient for users to quickly open and close the coating housing for assembly and material handling. Utility Model Content

[0004] To address the problems mentioned in the background art, the purpose of this utility model is to provide a device for uniform coating on both the inner and outer sides of small-diameter parts. This device has the advantage of quickly opening and closing the top and bottom shells for assembly. It solves the problem that when using a coating machine to uniformly coat small-diameter parts, the small-diameter parts need to be evenly placed inside the coating shell. However, after uniformly coating the small-diameter parts through the coating shell, manual mold opening is required, which is a cumbersome process and inconvenient for users to quickly open and close the coating shell for assembly and material handling.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for uniform double-sided coating of small-diameter parts, comprising a coating machine for processing small-diameter parts, a bottom shell, and a top shell. The bottom shell is located on top of the coating machine and is fixedly connected to the top of the coating machine. The top shell is located on top of the bottom shell and is inserted and fitted into the top of the bottom shell. Assembly mechanisms for use with the top shell are provided on both the left and right sides of the top shell. Lifting mechanisms for use with the assembly mechanisms are provided on both the left and right sides of the rear side of the top of the coating machine. A transmission mechanism for use with the lifting mechanism is provided on the rear side of the lifting mechanism. The inner cavity of the bottom shell is provided with a support mechanism for use with small-diameter part holes. The support mechanism includes a fixed shell, a drive motor, a transmission rod, and a placement tray. The fixed shell is located in the inner cavity of the bottom shell and is fixedly connected to the inner wall of the bottom shell. The drive motor is located in the inner cavity of the fixed shell and is fixedly connected to the inner wall of the bottom shell. The output end of the drive motor is rotatably connected to the inner wall of the fixed shell. The transmission rod is located at the output end of the drive motor and is fixedly connected to the output end of the drive motor. There are multiple placement trays, which are evenly distributed on the surface of the transmission rod and fixedly connected to the surface of the transmission rod.

[0006] In a preferred embodiment of this utility model, the assembly mechanism includes a fixing block, a plug-in rod, and a positioning screw. The fixing block is located on the surface of the top shell and is fixedly connected to the surface of the top shell. The inner cavity of the front side of the plug-in rod is inserted into and fits against the surface of the fixing block. The rear side of the positioning screw passes through the plug-in rod and is inserted into the inner cavity of the fixing block. The surface of the positioning screw is threadedly connected to the plug-in rod and the inner cavity of the fixing block.

[0007] In a preferred embodiment of this invention, the lifting mechanism includes a connecting frame, a lead screw, a slider, and a connecting gear. The connecting frame is located at the top of the coating machine and is fixedly connected to the top of the coating machine. The lead screw is located in the inner cavity of the connecting frame and is movably connected to the inner wall of the connecting frame via a rotating shaft. The inner cavity of the slider is threadedly connected to the surface of the lead screw. The top of the slider is fixedly connected to the bottom of the rear side of the insertion rod. The bottom of the connecting gear passes through the connecting frame and is fixedly connected to the top of the lead screw. The bottom surface of the lead screw is rotatably connected to the inner wall of the connecting frame.

[0008] In a preferred embodiment of this utility model, the transmission mechanism includes a fixed plate, a dual-head motor, two transmission gears, and two racks. The fixed plate is located on the rear side of the two connecting frames and is fixedly connected to the rear side of the connecting frames. The dual-head motor is located on the top of the fixed plate and is fixedly connected to the top of the fixed plate. The two transmission gears are located at the output ends on the left and right sides of the top of the dual-head motor and are fixedly connected to the output ends of the dual-head motor. The rear side of the inner cavity of the rack is meshed with the surface of the transmission gear, and the front side of the inner cavity of the rack is meshed with the surface of the connecting gear.

[0009] As a preferred embodiment of this utility model, a movable rod is fixedly connected to the rear side of the top shell, and a support rod is fixedly connected to the rear side of the top of the coating machine. The left and right sides of the bottom of the movable rod are inserted and fitted into the left and right sides of the inner cavity of the support rod.

[0010] As a preferred embodiment of this utility model, the bottom of the top shell is fixedly connected with a docking rod, and the number of docking rods is multiple and distributed in a ring at the bottom of the top shell. The top of the bottom shell is provided with a docking groove, and the number of docking grooves is multiple and distributed in a ring at the top of the bottom shell. The bottom of the docking rod is inserted and fitted into the inner cavity of the docking groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model solves the problem of the need to uniformly place small-diameter parts inside the coating shell while uniformly coating them using the coating machine, and the need for manual mold opening after uniform coating, which is cumbersome and inconvenient for users to quickly open and close the coating shell for assembly and material handling. It achieves the effect of quickly opening and closing the top shell and bottom shell for assembly.

[0013] 2. By setting up an assembly mechanism, this utility model can quickly dock with the top shell and assemble and fix it, thus avoiding the situation where the top shell cannot be quickly assembled and fixed.

[0014] 3. This utility model, by setting up a lifting mechanism and a transmission mechanism, enables the lifting mechanism to be used quickly, while the lifting mechanism enables the assembly mechanisms on both sides to be moved up and down quickly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the lifting and lowering of the top shell;

[0017] Figure 3 These are multi-angle views illustrating the structure of this utility model;

[0018] Figure 4 This is an exploded view of the assembly of the top shell and the assembly mechanism.

[0019] Figure 5 This is a schematic diagram of the combination of the transmission mechanism and the lifting mechanism;

[0020] Figure 6 This is a cross-sectional view of the bottom and top shells.

[0021] In the diagram: 1. Coating machine; 2. Bottom shell; 3. Top shell; 4. Assembly mechanism; 5. Lifting mechanism; 6. Transmission mechanism; 401. Fixing block; 402. Insertion rod; 403. Positioning screw; 501. Connecting frame; 502. Lead screw; 503. Slider; 504. Connecting gear; 601. Fixing plate; 602. Double-headed motor; 603. Transmission gear; 604. Rack; 7. Moving rod; 8. Support rod; 9. Connecting rod; 10. Connecting groove; 11. Placing mechanism; 1101. Fixing shell; 1102. Drive motor; 1103. Transmission rod; 1104. Placing tray. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0025] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0026] Example 1

[0027] Reference Figure 1-5This first embodiment of the present invention provides a device for uniform double-sided coating of small-diameter parts, including a coating machine 1, a bottom shell 2, and a top shell 3 for processing small-diameter parts. The bottom shell 2 is located on top of the coating machine 1 and is fixedly connected to the top of the coating machine 1. The top shell 3 is located on top of the bottom shell 2 and is inserted and fitted into the top of the bottom shell 2. Assembly mechanisms 4 are provided on both the left and right sides of the top shell 3 for use with the top shell 3. Lifting mechanisms 5 are provided on both the left and right sides of the rear top of the coating machine 1 for use with the assembly mechanisms 4. A transmission mechanism 6 is provided on the rear side of the lifting mechanism 5 for use with the lifting mechanism 5. A support and placement machine for use with the small-diameter parts is provided in the inner cavity of the bottom shell 2. The structure 11 includes a fixed shell 1101, a drive motor 1102, a transmission rod 1103, and a placement tray 1104. The fixed shell 1101 is located in the inner cavity of the bottom shell 2 and is fixedly connected to the inner wall of the bottom shell 2. The drive motor 1102 is located in the inner cavity of the fixed shell 1101 and is fixedly connected to the inner wall of the bottom shell 2. The output end of the drive motor 1102 is rotatably connected to the inner wall of the fixed shell 1101. The transmission rod 1103 is located at the output end of the drive motor 1102 and is fixedly connected to the output end of the drive motor 1102. The placement trays 1104 are multiple and evenly distributed on the surface of the transmission rod 1103 and are fixedly connected to the surface of the transmission rod 1103.

[0028] Specifically, the assembly mechanism 4 enables the top shell 3 and the lifting mechanism 5 to be quickly assembled. The lifting mechanism 5 allows the top shell 3 to be moved up and down quickly via the assembly mechanism 4, thereby achieving the effect of quickly connecting and assembling the top shell 3 with the bottom shell 2. The placement mechanism 11 provides stable placement for small-diameter parts, and through the rotating end of the placement mechanism 11, it cooperates with the bottom shell 2 and the top shell 3 to achieve uniform coating of small-diameter parts, avoiding the situation where small-diameter parts cannot be stably coated.

[0029] Furthermore, the top shell 3 is connected and installed with the two side assembly mechanisms 4. After installation, the transmission mechanism 6 is started. The transmission mechanism 6 will quickly drive the lifting mechanism 5 for use. During use, the lifting mechanism 5 will drive the top shell 3 and the bottom shell 2 to open and close through the assembly mechanism 4.

[0030] Example 2

[0031] In the second embodiment of this utility model, the assembly mechanism 4 includes a fixing block 401, a plug-in rod 402, and a positioning screw 403. The fixing block 401 is located on the surface of the top shell 3 and is fixedly connected to the surface of the top shell 3. The inner cavity of the front side of the plug-in rod 402 is inserted into and fits against the surface of the fixing block 401. The rear side of the positioning screw 403 passes through the plug-in rod 402 and is inserted into the inner cavity of the fixing block 401. The surface of the positioning screw 403 is threadedly connected to the plug-in rod 402 and the inner cavity of the fixing block 401.

[0032] Specifically, the assembly mechanism 4 serves to quickly dock with and assemble the top shell 3, thus avoiding situations where the top shell 3 cannot be quickly assembled and secured.

[0033] Furthermore, the two plug-in rods 402 on both sides are aligned and fitted with the fixing blocks 401 on the left and right sides of the housing. After alignment, the positioning screw 403 is passed through the plug-in rod 402 from the front and inserted into the inner cavity of the fixing block 401. This achieves the effect of locking and fixing the plug-in rod 402 and the fixing block 401 by the positioning screw 403. After fixing, the top shell 3 can be quickly assembled and fixed.

[0034] Example 3

[0035] In the third embodiment of this utility model, the lifting mechanism 5 includes a connecting frame 501, a lead screw 502, a slider 503, and a connecting gear 504. The connecting frame 501 is located at the top of the coating machine 1 and is fixedly connected to the top of the coating machine 1. The lead screw 502 is located in the inner cavity of the connecting frame 501 and is movably connected to the inner wall of the connecting frame 501 via a rotating shaft. The inner cavity of the slider 503 is threadedly connected to the surface of the lead screw 502. The top of the slider 503 is fixedly connected to the bottom of the rear side of the insertion rod 402. The bottom of the connecting gear 504 passes through the connecting frame 501 and is fixedly connected to the top of the lead screw 502. The bottom surface of the lead screw 502 is rotatably connected to the inner wall of the connecting frame 501. The transmission mechanism 6 includes a fixed plate 601, a dual-head motor 602, two transmission gears 603, and two racks 604. The fixed plate 601 is located at the rear side of the two connecting frames 501 and is fixedly connected to the rear side of the connecting frames 501. Machine 602 is located on top of fixed plate 601 and is fixedly connected to the top of fixed plate 601. Two transmission gears 603 are located at the output ends on the left and right sides of the top of double-headed motor 602 and are fixedly connected to the output ends of double-headed motor 602. The rear side of the inner cavity of rack 604 meshes with the surface of transmission gear 603, and the front side of the inner cavity of rack 604 meshes with the surface of connecting gear 504. A moving rod 7 is fixedly connected to the rear side of top shell 3. A support rod 8 is fixedly connected to the rear side of top of coating machine 1. The left and right sides of the bottom of moving rod 7 are inserted and fitted with the left and right sides of the inner cavity of support rod 8. A docking rod 9 is fixedly connected to the bottom of top shell 3. There are multiple docking rods 9 distributed in a ring at the bottom of top shell 3. A docking groove 10 is opened on the top of bottom shell 2. There are multiple docking grooves 10 distributed in a ring at the top of bottom shell 2. The bottom of docking rod 9 is inserted and fitted with the inner cavity of docking groove 10.

[0036] Specifically, the transmission mechanism 6 enables the lifting mechanism 5 to be used quickly, while the lifting mechanism 5 enables the assembly mechanisms 4 on both sides to be lifted and moved quickly.

[0037] Furthermore, after the top shell 3 is assembled, the dual-head motor 602 is started. The dual-head motor 602 drives the transmission gear 603 to rotate through its output end. During the rotation of the transmission gear 603, the transmission gear 603 drives the connecting gear 504 to rotate through the rack 604. When the connecting gear 504 rotates, it drives the lead screw 502 to rotate. During the rotation of the lead screw 502, it drives the slider 503 to move up and down. During the movement of the slider 503, the mounting rod drives the fixing block 401 to move accordingly. When the fixing block 401 moves accordingly, it drives the top shell 3 to move up and down, thereby achieving the effect of opening and closing the top shell 3 and the bottom shell 2. During the movement of the top shell 3, the moving rod 7 and the support rod 8 ensure its movement stability.

[0038] Working principle:

[0039] Align the two connecting rods 402 with the fixing blocks 401 on the left and right sides of the housing. After alignment, insert the positioning screw 403 through the connecting rod 402 from the front and into the inner cavity of the fixing block 401. This locks the connecting rod 402 and the fixing block 401 together, allowing for quick assembly of the top shell 3. After assembly, start the dual-head motor 602. The dual-head motor 602 will drive the transmission gear 603 to rotate through its output end. During rotation, the transmission gear 603 will drive the connecting gear 504 to rotate through the rack 604. The connecting gear 504 will then drive the lead screw 502 to rotate, which in turn will drive the slider 503 to move up and down. During the process, the mounting rod drives the fixed block 401 to move. As the fixed block 401 moves, it drives the top shell 3 to move up and down, thereby achieving the effect of opening and closing the top shell 3 and the bottom shell 2. During the movement of the top shell 3, the moving rod 7 and the support rod 8 ensure its movement stability. During the coating process of small-diameter part holes, the drive motor 1102 is started. The drive motor 1102 drives the transmission rod 1103 to rotate through its output end. During the rotation of the transmission rod 1103, it drives multiple placement discs 1104 to rotate stably. During the rotation of the placement discs 1104, through the cooperation of the bottom shell 2, the top shell 3 and the coating machine, the small-diameter part holes are uniformly coated, avoiding uneven coating during the processing of small-diameter part holes.

[0040] In summary, through the cooperation of the coating machine 1, bottom shell 2, top shell 3, assembly mechanism 4, lifting mechanism 5 and transmission mechanism 6, the effect of quickly driving the top shell 3 and bottom shell 2 to open and close for assembly is achieved.

[0041] The coating machine 1, bottom shell 2, top shell 3, positioning screw 403, connecting frame 501, lead screw 502, slider 503, double-head motor 602, transmission gear 603 and rack 604 used in this application can be additionally equipped with protective measures of common knowledge in this technical field under different usage environments, including but not limited to the following methods, such as protective covers for equipment protection, dustproof nets for equipment dust prevention, and sealing components or waterproof coatings for equipment waterproofing, etc., which are commonly used by those skilled in the art.

[0042] It should be noted that the coating machine 1, bottom shell 2, top shell 3, positioning screw 403, connecting frame 501, lead screw 502, slider 503, double-head motor 602, transmission gear 603 and rack 604 are existing devices or equipment, or devices or equipment that can be implemented by existing technology. The power supply, connection method, usage method, power source, fixing method, installation method, control method, etc. of the equipment, as well as the materials of each accessory and the selection of various parameters are all common knowledge in the art, and therefore will not be described in detail in this application document.

[0043] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0044] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0045] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for uniform coating on both the inner and outer sides of a small-diameter part, characterized in that: The system includes a coating machine (1) for machining small-diameter parts, a bottom shell (2), and a top shell (3). The bottom shell (2) is located on top of the coating machine (1) and is fixedly connected to the top of the coating machine (1). The top shell (3) is located on top of the bottom shell (2) and is inserted and fitted to the top of the bottom shell (2). The top shell (3) is provided with assembly mechanisms (4) on both the left and right sides for use with the top shell (3); The coating machine (1) is equipped with lifting mechanisms (5) on both the left and right sides of the top rear side, which are used in conjunction with the assembly mechanism (4). The rear side of the lifting mechanism (5) is provided with a transmission mechanism (6) that works in conjunction with the lifting mechanism (5). The inner cavity of the bottom shell (2) is provided with a support mechanism (11) for use with small-diameter part holes. The support mechanism (11) includes a fixed shell (1101), a drive motor (1102), a transmission rod (1103), and a placement tray (1104). The fixed shell (1101) is located in the inner cavity of the bottom shell (2) and is fixedly connected to the inner wall of the bottom shell (2). The drive motor (1102) is located in the inner cavity of the fixed shell (1101) and is fixedly connected to the inner wall of the bottom shell (2). The output end of the drive motor (1102) is rotatably connected to the inner wall of the fixed shell (1101). The transmission rod (1103) is located at the output end of the drive motor (1102) and is fixedly connected to the output end of the drive motor (1102). The placement tray (1104) is multiple and evenly distributed on the surface of the transmission rod (1103) and is fixedly connected to the surface of the transmission rod (1103).

2. The device for uniform plating of both inner and outer surfaces of small aperture parts according to claim 1, wherein: The assembly mechanism (4) includes a fixing block (401), a plug rod (402), and a positioning screw (403). The fixing block (401) is located on the surface of the top shell (3) and is fixedly connected to the surface of the top shell (3). The inner cavity of the front side of the plug rod (402) is inserted into and fits against the surface of the fixing block (401). The rear side of the positioning screw (403) passes through the plug rod (402) and is inserted into the inner cavity of the fixing block (401). The surface of the positioning screw (403) is connected to the inner cavity of the plug rod (402) and the fixing block (401) by threads.

3. The apparatus for uniform coating on both the inner and outer sides of a small-diameter part according to claim 2, characterized in that: The lifting mechanism (5) includes a connecting frame (501), a lead screw (502), a slider (503), and a connecting gear (504). The connecting frame (501) is located at the top of the coating machine (1) and is fixedly connected to the top of the coating machine (1). The lead screw (502) is located in the inner cavity of the connecting frame (501) and is movably connected to the inner wall of the connecting frame (501) through a rotating shaft. The inner cavity of the slider (503) is connected to the surface of the lead screw (502) through a thread. The top of the slider (503) is fixedly connected to the bottom of the rear side of the plug rod (402). The bottom of the connecting gear (504) passes through the connecting frame (501) and is fixedly connected to the top of the lead screw (502). The bottom surface of the lead screw (502) is rotatably connected to the inner wall of the connecting frame (501).

4. The apparatus for uniform coating on both the inner and outer sides of a small-diameter part according to claim 3, characterized in that: The transmission mechanism (6) includes a fixed plate (601), a dual-head motor (602), two transmission gears (603), and two racks (604). The fixed plate (601) is located on the rear side of the two connecting frames (501) and is fixedly connected to the rear side of the connecting frames (501). The dual-head motor (602) is located on the top of the fixed plate (601) and is fixedly connected to the top of the fixed plate (601). The two transmission gears (603) are located at the output ends on the left and right sides of the top of the dual-head motor (602) and are fixedly connected to the output ends of the dual-head motor (602). The rear side of the inner cavity of the rack (604) meshes with the surface of the transmission gear (603), and the front side of the inner cavity of the rack (604) meshes with the surface of the connecting gear (504).

5. The apparatus for uniform coating on both the inner and outer sides of a small-diameter part according to claim 1, characterized in that: A movable rod (7) is fixedly connected to the rear side of the top shell (3), and a support rod (8) is fixedly connected to the rear side of the top of the coating machine (1). The left and right sides of the bottom of the movable rod (7) are inserted and fitted into the left and right sides of the inner cavity of the support rod (8).

6. The apparatus for uniform coating on both the inner and outer sides of a small-diameter part according to claim 1, characterized in that: The bottom of the top shell (3) is fixedly connected with a docking rod (9). There are multiple docking rods (9) distributed in a ring at the bottom of the top shell (3). The top of the bottom shell (2) is provided with a docking groove (10). There are multiple docking grooves (10) distributed in a ring at the top of the bottom shell (2). The bottom of the docking rod (9) is inserted into and fits into the inner cavity of the docking groove (10).

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