Lamp shell coating machine

Abstract

The application discloses a lamp shell coating machine, which is used for coating the inner wall of an exposure lamp shell and belongs to the technical field of vacuum evaporation coating, and comprises a closed shell body with a coating cavity arranged in the shell body, an evaporation source arranged at the bottom of the shell body and used for generating coating vapor, and a jig mechanism with a planetary gear train structure arranged in the coating cavity; the jig mechanism comprises an umbrella-shaped revolving component, a rotary part fixedly arranged on a shaft, and multiple sets of rotating components; the revolving component is engaged with a revolving driving part; the rotary part is provided with a fixed bevel gear one; the rotating components are rotatably arranged on the revolving component and are engaged with the bevel gear one for transmission; and the rotating components comprise an outer layer part and an inner layer part which are matched to form a lamp shell clamping gap. The lamp shell coating machine can realize the combined motion of the revolution and rotation of the lamp shell, completely eliminates the coating blind area of the inner wall of the lamp shell, greatly improves the uniformity of the coating layer and the product yield, has high compatibility, can be adapted to the synchronous coating of multiple specifications of lamp shells, and effectively improves the equipment productivity.

Description

Technical Field

[0001] This invention relates to the field of coating equipment technology, and more particularly to a lamp housing coating machine. Background Technology

[0002] In the manufacturing process of exposure lamps, in order to improve the light reflectivity and uniformity of the inner wall of the lamp housing, a thin metal film that can efficiently reflect ultraviolet light needs to be deposited on the inner wall of the lamp housing. Evaporation coating is one of the mainstream processes for coating the inner wall of the lamp housing.

[0003] In the existing technology, evaporation coating equipment used for coating the inner wall of lamp housing generally suffers from poor coating uniformity: during the coating process, the fixture support can only rotate along a single axis, and the motion mode is singular. It cannot take into account the curvature difference between the opening end and the bottom of the lamp housing, resulting in uneven distribution of the deposition rate of the evaporation material on the inner wall. The curved inner wall of the lamp housing is prone to coating dead corners, which in turn affects the yield. Summary of the Invention

[0004] The technical problem to be solved by this invention is: in order to solve the problem of uneven coating on the inner wall of the lamp housing, this invention provides a lamp housing coating machine, which realizes multi-dimensional uniform rotation of the lamp housing through a jig mechanism that revolves and rotates, thereby greatly improving the uniformity and efficiency of coating on the inner wall of the lamp housing.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a lamp housing coating machine, comprising a housing, a fixture mechanism, a material discharge mechanism and an evaporation source; The housing forms a sealed coating cavity inside, and the evaporation source is located at the bottom of the housing. The evaporation source is used to generate coating vapor. The fixture mechanism is located inside the coating cavity. The fixture mechanism is used to support and precisely position the lamp housing so that the lamp housing is suspended in the coating cavity with its opening facing downwards. The discharge mechanism is located at the bottom center of the coating chamber. The discharge mechanism includes a nozzle, the air outlet of which is facing upwards. The input end of the nozzle is connected to the evaporation source through a steam delivery pipeline. The fixture mechanism includes a revolution component, a rotary component, and a rotation component. One end of the rotary component is fixedly installed on the top of the housing. One end of the revolution component is sleeved on the rotary component and rotatably connected by a bearing. The rotation component is rotatably installed on the revolution component and meshes with the rotary component for transmission. The rotation component is used to clamp the open end of the lamp housing.

[0006] Therefore, when the orbital component revolves around the axis of the rotating component at a constant speed, the self-rotating component rotates synchronously in the opposite direction under the drive of gear meshing, so that the lamp housing continuously adjusts its posture with a "planetary" composite motion trajectory; together with the coating steam that is uniformly sprayed upward by the nozzle component, it can accurately cover the entire curved surface of the inner wall of the lamp housing, and is particularly good at eliminating the deposition blind spots in the bottom concave area and the transition zone of the opening end.

[0007] Furthermore, the orbiting assembly includes a hollow column, radial arms, and a ring. The ring is coaxially arranged with the hollow column, and its diameter is larger than that of the hollow column. The ring is located at the lower end of the hollow column. The radial arms are fixedly arranged between the ring and the hollow column. Multiple radial arms are provided, and they are evenly distributed circumferentially along the axis of the hollow column. The radial arms are curved downwards, giving the orbiting assembly an umbrella-like structure. The outer circumferential surface of the ring has a straight tooth structure, which meshes with a drive motor. The drive motor drives the orbiting assembly to rotate around its own axis. Thus, the umbrella-like structure generates a stable centrifugal airflow during high-speed orbiting, effectively disturbing the vapor flow field within the coating cavity and weakening the laminar boundary effect.

[0008] Furthermore, the rotating component includes a first bevel gear, a fixed rod, and a through hole. The lower end of the fixed rod is coaxially and fixedly connected to the bevel gear, and the upper end of the fixed rod is fixedly connected to the inner wall of the top of the housing. The through hole axially penetrates the fixed rod and the first bevel gear. The diameter of the first bevel gear is larger than the outer diameter of the hollow column and smaller than the inner diameter of the ring. The first bevel gear is located inside the revolution assembly, and the fixed rod passes through the inner side of the hollow column, and the fixed rod and the hollow column are rotatably connected by a bearing. Thus, the first bevel gear meshes with the second bevel gear of the rotation assembly, forming a vertical axis power transmission chain. When the revolution assembly rotates, the first bevel gear remains stationary, while the second bevel gear is driven to rotate in the opposite direction during relative motion.

[0009] Furthermore, the self-rotating component includes an outer layer, an inner layer, and a planetary bevel gear; the inner side of the outer layer is fixedly connected to the inner layer; the outer layer is a disc structure or an umbrella-shaped structure, and the outer contour of the inner layer matches the outer contour of the outer layer; The outer layer has a mounting part at the center of its end face, and a support rod is provided on the inner side of the radial arm. One end of the support rod is mounted to the mounting part via a bearing. The planetary bevel gear is disposed on the outer ring of the outer layer and meshes with bevel gear one for transmission. Thus, while the planetary bevel gear revolves around the fixed rod, it also rotates on its own axis using bevel gear one as a gear ring.

[0010] Furthermore, the axis of the outer layer intersects the axis of the fixing rod, and the included angle between them is an acute angle, preferably 30°-60°. This tilt design creates a spatial oblique intersection between the rotation axis and the revolution axis, significantly improving the scouring and coverage density of the coating vapor on the inner wall of the lamp housing. Combined with the centrifugal airflow generated by the umbrella-shaped radial arm, the matching relationship between the vapor adhesion angle and deposition rate can be dynamically optimized within the tilt angle range, thereby improving the isotropic film uniformity on the curved surface.

[0011] Furthermore, the inner side of the outer layer component is provided with an annular protrusion, and a positioning hole is provided through the end face of the outer layer component. The positioning hole and the protrusion are coaxially arranged, and the inner diameter of the protrusion is larger than the diameter of the positioning hole. The outer periphery of the inner layer component is provided with an annular protrusion, and a feed hole is provided through the end face of the inner layer component. The inner diameter of the protrusion is equal to the diameter of the feed hole, and the outer diameter of the protrusion is smaller than the inner diameter of the protrusion. An annular gap is formed between the protrusion and the protrusion to accommodate and clamp the opening end of the lamp housing. Thus, this annular gap can precisely adapt to the opening size of lamp housings of different specifications. Through the radial elastic fit of the protrusion and the protrusion, the self-centering clamping and axial limiting of the lamp housing are achieved.

[0012] Furthermore, the positioning holes are provided in multiple sets, which are evenly arranged circumferentially along the axis of the outer layer and evenly distributed radially along the outer layer. The feed holes correspond one-to-one with the positioning holes and are coaxially arranged, with the diameter of the feed holes being larger than that of the positioning holes. Thus, the multiple sets of feed holes form a ring-shaped steam jet array, which, in conjunction with the coupled motion of revolution and rotation, forms a spiral sweeping deposition trajectory on the inner wall of the lamp housing. The jet direction of each set is offset along the normal direction of the tilt angle of the outer layer, ensuring that the steam flow always impacts the curved surface at an incident angle of 35°–45°, effectively suppressing the shadowing effect and re-evaporation.

[0013] Furthermore, the discharge mechanism also includes a base platform, a lifting platform, and a control arm. The bottom of the base platform is fixedly connected to the inner wall of the bottom of the coating chamber. The platform surface of the lifting platform is located above the base platform, and the bottom column of the lifting platform slides through the center of the base platform, with a lifting drive component installed at the lower end of the bottom column. One end of the control arm is hinged to the side wall of the platform surface of the lifting platform, and the other end of the control arm is hinged to the side wall of the base platform. The nozzle component is fixedly installed on the outside of the control arm. Thus, the lifting drive component precisely controls the displacement of the bottom column, driving the lifting platform to make slight adjustments in the vertical direction, allowing the control arm to swing in the vertical plane, thereby driving the nozzle component to complete dynamic pitch adjustment in the vertical direction, ensuring that the nozzle component's outlet always points to the corresponding rotating component, and ensuring that the angle between the steam jet and the normal of the lamp housing surface remains constant within the optimal deposition range.

[0014] Furthermore, the control arms are provided in multiple sets, with each nozzle component corresponding to a control arm. These control arms are evenly distributed circumferentially along the axis of the lifting platform. Each control arm includes a first link and a second link. One end of the first link is hinged to the side wall of the base platform, and the other end is hinged to the middle of the second link. The upper end of the second link is hinged to the side wall of the lifting platform. The nozzle component is fixedly connected to the outer side wall of the second link. Thus, this double-link structure constitutes a planar four-bar linkage. When the lifting platform moves vertically, the second link automatically rotates around the hinge point, driving the nozzle component to smoothly swing along a preset trajectory.

[0015] Furthermore, it also includes a recycling mechanism, the input end of which is connected to the upper end of the through hole via a pipeline, and the output end of which is connected to the evaporation source via a pipeline. The recycling mechanism is used to recycle excess coating vapor in the coating chamber and transport it to the evaporation source for recycling, thereby reducing the material loss rate.

[0016] The beneficial effects of this invention are: 1. Compared with the prior art, the lamp housing coating machine of the present invention adopts a planetary gear system structure with a revolution component and a rotation component. The rotation component is equipped with multiple lamp housings. While the revolution component drives the automatic component to revolve around the central axis of the equipment, the rotation component drives the lamp housing to rotate around its own axis by meshing with a fixed rotating component, realizing multi-dimensional synchronous rotation of the lamp housing. Combined with the downward-facing suspension structure of the lamp housing, the coating vapor can evenly cover all areas of the inner wall of the lamp housing, completely eliminating coating dead corners and greatly improving the uniformity of coating thickness, thereby improving the yield of exposure lamp housings.

[0017] 2. The lamp housing coating machine of the present invention adopts a double-layer clamping structure of outer and inner parts for its self-rotating component. The opening end of the lamp housing is precisely clamped through the annular gap formed by protrusion one and protrusion two. The clamping is convenient, the positioning accuracy is high, and it will not block the inner wall coating area of ​​the lamp housing, thus ensuring the integrity of the coating. At the same time, the design of multiple sets of positioning holes can clamp multiple lamp housings at the same time, which greatly improves the coating efficiency.

[0018] 3. The lamp housing coating machine of the present invention adopts a structure of lifting platform and multiple sets of articulated control arms for its discharge mechanism. The lifting platform is driven to rise and fall by the lifting drive component, so that the unfolding angle of all control arms and the height and spray direction of the nozzle can be adjusted simultaneously, so that the air outlet of the nozzle can be accurately aligned with the inner cavity of the self-rotating component, which greatly improves the utilization rate of coating steam and reduces material waste.

[0019] 4. The lamp housing coating machine of the present invention, by setting a through-hole in the rotating part and cooperating with the recovery mechanism, can quickly extract and recover excess coating vapor in the coating chamber. After condensation and filtration, it is sent back to the evaporation source for recycling. This not only improves the utilization rate of coating materials and significantly reduces production costs, but also effectively reduces the pollution of the coating chamber wall by coating vapor, and reduces the frequency and cost of equipment maintenance. At the same time, it can maintain the stability of the vacuum degree in the coating chamber, further ensuring the consistency of coating quality. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the lamp housing coating machine in this invention.

[0022] Figure 2 This is a schematic diagram of the fixture mechanism.

[0023] Figure 3 This is a schematic diagram of the outer layer component.

[0024] Figure 4 This is a partial sectional view of the rotating component.

[0025] Figure 5 This is a schematic diagram of the material discharge mechanism.

[0026] In the diagram: 1. Fixture mechanism; 11. Revolutionary assembly; 111. Hollow column; 112. Radial arm; 113. Ring; 12. Rotating component; 121. Bevel gear one; 122. Fixed rod; 123. Through hole; 13. Rotation assembly; 131. Outer layer component; 1311. Protrusion one; 1312. Positioning hole; 132. Inner layer component; 1321. Protrusion two; 1322. Feed hole; 2. Discharge mechanism; 21. Base platform; 22. Lifting platform; 23. Connecting rod one; 24. Connecting rod two; 3. Evaporation source; 4. Recovery mechanism. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0028] Example 1: like Figures 1-4 A lamp housing coating machine for coating the inner wall of a lamp housing includes a sealed housing, with a vacuum coating chamber formed inside the housing. An evaporation source 3 is fixedly installed at the bottom of the housing. The evaporation source 3 is used to heat the coating material and generate coating vapor that diffuses upward. In this embodiment, the evaporation source 3 can be a resistance evaporation source or an electron beam evaporation source, and the appropriate type can be selected according to the type of coating material.

[0029] The coating cavity is equipped with a fixture mechanism 1. The fixture mechanism 1 adopts a planetary gear system structure, which is used to clamp the lamp housing to be coated and drive the lamp housing to perform a composite motion of revolution and rotation. The fixture mechanism 1 includes a revolution component 11, a rotation component 12 and multiple sets of rotation components 13.

[0030] in: Reference Figure 2The orbital assembly 11 includes a coaxially arranged hollow column 111, a ring 113, and multiple radial arms 112. The ring 113 and the hollow column 111 are arranged coaxially along the vertical axis of the shell. The inner diameter of the ring 113 is larger than the outer diameter of the hollow column 111, and the ring 113 is located at the lower end of the hollow column 111 (the end closer to the evaporation source 3). The multiple radial arms 112 are fixedly connected between the lower outer wall of the hollow column 111 and the inner ring surface of the ring 113, and the multiple radial arms 112 are evenly spaced along the circumferential axis of the hollow column 111. Each radial arm 112 has a downwardly curved arc structure, so that the orbital assembly 11 as a whole forms an umbrella-shaped structure with its opening facing the evaporation source 3.

[0031] The outer ring surface of the circular ring 113 is integrally machined with a spur tooth structure. A revolution drive motor is fixedly installed on the inner wall of the housing. A drive spur gear is coaxially fixed on the output shaft of the revolution drive motor. The drive spur gear meshes with the spur tooth structure on the outer ring surface of the circular ring 113 to drive the revolution component 11 to rotate around its own vertical axis (i.e., the revolution motion of the lamp housing).

[0032] Reference Figure 2 The rotating component 12 is a stationary component fixed to a fixed axis, including a bevel gear 121, a fixing rod 122, and a through hole 123 extending axially. The fixing rod 122 is a vertically arranged round rod structure, with its upper end coaxially fixedly connected to the inner wall of the top of the housing, and its lower end coaxially fixedly connected to the upper end face of the bevel gear 121; the through hole 123 extends along the axis of the fixing rod 122, with its lower end extending to penetrate the lower end face of the bevel gear 121, and its upper end extending to be able to communicate with the external pipeline of the housing.

[0033] The outer diameter of the bevel gear 121 is larger than the outer diameter of the hollow column 111 and smaller than the inner diameter of the ring 113, so that the bevel gear 121 is suspended in the inner cavity of the revolution assembly 11; the fixing rod 122 passes through the inner hole of the hollow column 111, and the outer wall of the fixing rod 122 and the inner wall of the hollow column 111 are rotatably connected by at least two sets of deep groove ball bearings, which not only ensures the fixed stability of the rotating part 12, but also allows the revolution assembly 11 to rotate smoothly around the fixed rotating part 12.

[0034] Reference Figure 2 The self-rotating component 13 is rotatably mounted on the radial arm 112 of the revolution component 11 and meshes with the bevel gear 121 of the rotating component 12 for transmission, and is used to clamp the open end of the lamp housing to be coated; in this embodiment, the number of self-rotating components 13 corresponds one-to-one with the number of radial arms 112, and a set of self-rotating components 13 is installed on the inner side of each set of radial arms 112.

[0035] Reference Figure 2 and Figure 4The self-rotating component 13 includes an outer layer 131 and an inner layer 132 that are coaxially fixedly connected. The outer layer 131 has a disc-shaped structure. The outer contour of the inner layer 132 matches the outer contour of the outer layer 131. The inner layer 132 is fixedly attached to the lower end face (the side end face near the evaporation source 3) of the outer layer 131 by bolts.

[0036] The axis of the outer layer 131 intersects the vertical axis of the fixing rod 122, and the included angle between them is an acute angle. In this embodiment, the acute angle is 60°, which can be flexibly adjusted within the range according to the lamp housing specifications and coating requirements. The outer ring surface of the outer layer 131 is integrally machined with a bevel gear 2, which meshes with the bevel gear 121 to form a bevel gear transmission pair.

[0037] Reference Figure 4 The outer layer 131 has a columnar mounting part integrally provided at the center of its upper end face. A downwardly extending support rod is fixed to the inner side wall of the radial arm 112. The lower end of the support rod is rotatably connected to the mounting part by an angular contact ball bearing, so that the self-rotating assembly 13 can rotate freely around its own axis.

[0038] The lower end face of the outer layer 131 is integrally provided with a downwardly protruding rectangular annular protrusion 1311. A positioning hole 1312 is provided through the upper end face to the lower end face of the outer layer 131. The positioning hole 1312 is coaxially arranged with the protrusion 1311, and the inner diameter of the protrusion 1311 is larger than the diameter of the positioning hole 1312. The upper end face of the inner layer 132 is integrally provided with an upwardly protruding annular protrusion 1321. A feed hole 1322 is provided through the upper end face to the lower end face of the inner layer 132. The feed hole 1322 is coaxially arranged with the protrusion 1321, and the inner diameter of the protrusion 1321 is equal to the diameter of the feed hole 1322.

[0039] The outer diameter of the second protrusion 1321 is smaller than the inner diameter of the first protrusion 1311, so that the second protrusion 1321 and the first protrusion 1311 form an annular clamping gap. This annular clamping gap is used to accommodate and limit the open end of the lamp housing to be coated. The open end of the lamp housing is inserted into the annular clamping gap to achieve radial and axial positioning. The tapered part of the lamp housing passes through the positioning hole 1312. The inner cavity of the lamp housing is connected to the coating cavity through the feed hole 1322, so that the coating vapor can smoothly enter the inner wall of the lamp housing to complete the coating.

[0040] In this embodiment, multiple sets of positioning holes 1312 are provided. The positioning holes 1312 in each set are evenly spaced along the circumferential axis of the outer layer 131, and the multiple sets of positioning holes 1312 are evenly distributed in multiple rings along the radial direction of the outer layer 131. The feed hole 1322 is coaxially arranged in a one-to-one correspondence with the positioning hole 1312, and the diameter of the feed hole 1322 is larger than the diameter of the positioning hole 1312. This structure can clamp multiple sets of lamp housings of different specifications at the same time, which greatly improves the coating capacity and equipment compatibility.

[0041] Its working principle is as follows: Before coating, the conical part of the lamp housing to be coated passes through the positioning hole 1312 from below the outer layer 131, with its opening end located inside the protrusion 1311. Then, the inner layer 132 is fixedly connected to the outer layer 131, thus completing the lamp housing clamping. The opening of the lamp housing faces the downward evaporation source 3. After closing the housing and evacuating the coating chamber to the preset vacuum level, the evaporation source 3 is started to heat the coating material to generate coating vapor, and the revolution drive motor is started at the same time.

[0042] The revolution drive motor drives the ring 113 to rotate from right to left through the active spur gear, thereby driving the entire revolution assembly 11 to revolve around the vertical axis of the fixed rod 122. The self-rotating assembly 13 installed on the radial arm 112 revolves synchronously with the revolution assembly 11. At the same time, since the bevel gear 2 of the self-rotating assembly 13 meshes with the fixed bevel gear 121, during the revolution, the bevel gear transmission pair converts the revolution motion into the self-rotation motion of the self-rotating assembly 13 around its own axis, so that the clamped lamp housing completes the compound motion of revolution and self-rotation at the same time.

[0043] This composite motion ensures that all areas of the inner wall of the lamp housing receive coating vapor evenly, completely eliminating coating blind spots and guaranteeing the consistency of film thickness, thus significantly improving the coating quality and product yield of the inner wall of the lamp housing.

[0044] Example 2: The lamp housing coating machine for coating the inner wall of the lamp housing provided in this example has the same overall structure, connection relationship and working principle as Example 1. The only difference is the structure of the outer layer 131 of the self-rotating component 13.

[0045] Specifically, in this embodiment, the outer layer 131 of the self-rotating component 13 is changed from the disc-shaped structure of Embodiment 1 to an umbrella-shaped structure with the opening facing the evaporation source 3. The outer contour of the inner layer 132 matches the umbrella-shaped outer contour of the outer layer 131. The inner layer 132 is fixed to the inner end face of the outer layer 131 by bolts.

[0046] The axis of the outer layer 131 intersects the vertical axis of the fixed rod 122, and the included angle between them is an acute angle; a second bevel gear is integrally machined on the outer ring surface of the outer layer 131, and the second bevel gear meshes with the first bevel gear 121 for transmission; a columnar mounting part is integrally provided in the center of the upper end face of the outer layer 131, and the lower end of the support rod corresponding to the inner side of the radial arm 112 is rotatably connected to the mounting part through an angular contact ball bearing.

[0047] The inner end face of the outer layer 131 is provided with a rectangular annular protrusion 1311, and a positioning hole 1312 coaxial with the protrusion 1311 is provided through the outer layer 131. The inner layer 132 is provided with a protrusion 1321 that mates with the protrusion 1311, and a feed hole 1322 that is coaxial with the positioning hole 1312. The arrangement of the positioning hole 1312 and the feed hole 1322, their dimensional matching relationship, and the structure of the annular clamping gap formed by the protrusion 1311 and the protrusion 1321 are all completely consistent with Embodiment 1.

[0048] The remaining structures, connections, and working principles of this embodiment are exactly the same as those of Embodiment 1, and will not be repeated here.

[0049] In this embodiment, by setting the outer layer 131 as an umbrella-shaped structure, the spatial layout of the rotating assembly 13 can be further optimized to accommodate larger sizes and more lamp housings, improving equipment compatibility. The umbrella-shaped structure also provides superior airflow guidance characteristics during high-speed rotation, significantly reducing airflow disturbance within the coating cavity and suppressing vapor diffusion path deviation, thereby further improving film uniformity and adhesion. Furthermore, the umbrella-shaped structure exhibits more uniform force distribution, reducing vibration during high-speed rotation of the rotating assembly 13, improving equipment operational stability, and further ensuring coating uniformity.

[0050] Example 3: To ensure that the coating vapor more accurately covers the curved surface of the inner wall of the lamp housing, this example is optimized based on Example 2 as follows: Reference Figure 1 and Figure 5 The lamp housing coating machine of this embodiment has the same main structure, fixture mechanism 1 structure and working principle as that of embodiment 2. This embodiment also adds a discharge mechanism 2 and a recycling mechanism 4.

[0051] The discharge mechanism 2 is located at the bottom center of the coating chamber, above the evaporation source 3 and below the fixture mechanism 1. The discharge mechanism 2 includes a base platform 21, a lifting platform 22, multiple control arms, and nozzles that correspond to the control arms.

[0052] The base platform 21 is a circular platform structure, and its bottom is coaxially fixedly connected to the inner wall of the bottom of the coating chamber. The lifting platform 22 is coaxially arranged directly above the base platform 21. A lifting guide column is coaxially fixed on the lower end face of the lifting platform 22. The lifting guide column slides through the guide hole in the center of the base platform 21. The lower end of the lifting guide column is connected to a lifting drive component. The lifting drive component is a vacuum-type electric push rod, which is fixedly installed on the lower end face of the base platform 21 and is used to drive the lifting platform 22 to move vertically.

[0053] Multiple control arms are evenly spaced along the circumferential axis of the lifting platform 22. Each control arm includes a first connecting rod 23 and a second connecting rod 24 that are hinged to each other. The lower end of the first connecting rod 23 is hinged to the upper edge of the base 21, and the upper end is hinged to the lower end of the second connecting rod 24. The upper end of the second connecting rod 24 is hinged to the edge of the lifting platform 22, so that the first connecting rod 23, the second connecting rod 24, the base 21 and the lifting platform 22 form a crank-slider type linkage mechanism.

[0054] The nozzle is fixedly installed on the outer wall of the connecting rod 24 of the corresponding control arm. The air outlet of the nozzle is set upward and the air outlet direction is obliquely upward. The horizontal component of the air outlet direction is set opposite to the revolution rotation direction of the revolution component 11. The air inlet of the nozzle is connected to the steam output end of the evaporation source 3 through a flexible vacuum steam conveying pipeline, so that the coating steam generated by the evaporation source 3 can be conveyed to the nozzle through the steam conveying pipeline and sprayed directionally into the inner cavity of the lamp housing to be coated.

[0055] In this embodiment, the lifting platform 22 is driven to rise and fall by the lifting drive component, which can drive the linkage mechanism to move, thereby adjusting the spray angle and height of the nozzle in real time to achieve directional and precise delivery of coating steam. At the same time, the upward-sloping air outlet design, which is opposite to the direction of revolution, allows the coating steam to form relative motion with the rotating and revolving lamp housing, further improving the uniformity of the coating on the inner wall of the lamp housing and avoiding problems such as uneven film thickness and poor coverage of corners.

[0056] Reference Figure 1 , Figure 2 The rotating part 12 has a through hole 123 that extends through it along the axial direction. The through hole 123 extends through the axis of the fixed rod 122, with its lower end extending to the lower end face of the bevel gear 121 and its upper end extending to be able to communicate with the external pipeline of the housing.

[0057] The recovery mechanism 4 includes a condensation unit, a filtration and purification unit and a vacuum pump connected in sequence through pipelines. The input end of the recovery mechanism 4 is connected to the upper end of the straight hole 123 of the rotating part 12 through a vacuum pipeline, and the output end of the recovery mechanism 4 is connected to the feed end of the evaporation source 3 through a pipeline.

[0058] During the coating process, excess coating vapor and volatile byproducts that do not deposit in the coating chamber can be drawn into the recovery mechanism 4 through the through-hole 123. After being condensed into a solid by the condensation unit and impurities removed by the filtration and purification unit, they are recycled back to the evaporation source 3. This significantly reduces the loss of coating material, improves material utilization, reduces impurity contamination in the coating chamber, and extends the equipment maintenance cycle. The remaining structures and working principles of the fixture mechanism 1 in this embodiment are exactly the same as in embodiment 2, and will not be described again here.

[0059] In the above embodiments, the "upper" and "lower" orientations are based on the vertical axis of the lamp housing coating machine housing, with the side closer to the top of the housing being upper and the side closer to the bottom of the housing evaporation source being lower; the "coaxial" refers to the central axes of the corresponding components being aligned.

[0060] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A lamp housing coating machine for coating the inner wall of a lamp housing, characterized in that, include: The housing has a sealed coating cavity inside, and an evaporation source (3) is provided at the bottom of the housing to generate coating vapor. The fixture mechanism (1) is located inside the coating cavity. The fixture mechanism (1) is used to support and precisely position the lamp housing so that its opening faces downward and it is suspended inside the coating cavity. The discharge mechanism (2) is located at the bottom center of the coating chamber. The discharge mechanism (2) includes a nozzle, the air outlet of which is set upwards. The input end of the nozzle is connected to the evaporation source (3) through a steam conveying pipeline. Wherein: the fixture mechanism (1) includes a revolution component (11), a rotary component (12) and a rotation component (13). One end of the rotary component (12) is fixedly installed with the housing. One end of the revolution component (11) is sleeved on the rotary component (12) and connected by a bearing. The rotation component (13) is rotatably installed on the revolution component (11). The rotation component (13) meshes with the rotary component (12). The rotation component (13) is used to clamp the open end of the lamp housing.

2. The lamp housing coating machine according to claim 1, characterized in that: The orbital assembly (11) includes a hollow column (111), radial arms (112), and a ring (113). The ring (113) is coaxially arranged with the hollow column (111). The diameter of the ring (113) is larger than the diameter of the hollow column (111). The ring (113) is located at one end of the hollow column (111). The radial arms (112) are located between the ring (113) and the hollow column (111). There are multiple radial arms (112), and the radial arms (112) are evenly arranged circumferentially along the axis of the hollow column (111). The radial arm (112) is curved downwards, making the orbital assembly (11) have an umbrella-like structure. The outer side of the ring (113) is straight-toothed, and the tooth surface is engaged with a drive motor.

3. The lamp housing coating machine according to claim 2, characterized in that: The rotating component (12) includes a bevel gear (121), a fixed rod (122), and a through hole (123). One end of the fixed rod (122) is coaxially fixedly connected to the bevel gear (121), and the end of the fixed rod (122) away from the bevel gear (121) is fixedly connected to the top of the housing. One end of the through hole (123) passes through the fixed rod (122) and the bevel gear (121) axially. The diameter of the bevel gear (121) is larger than that of the hollow column (111) and smaller than that of the inner diameter of the ring (113). The bevel gear (121) is located inside the orbital assembly (11), and the fixed rod (122) is located inside the hollow column (111) and is connected by a bearing.

4. The lamp housing coating machine according to claim 3, characterized in that: The self-rotating component (13) includes an outer layer (131) and an inner layer (132). The inner side of the outer layer (131) is fixedly connected to the inner layer (132). The outer layer (131) is a disc structure or an umbrella structure. The outer contour of the inner layer (132) matches the outer contour of the outer layer (131).

5. The lamp housing coating machine according to claim 4, characterized in that: The axis of the outer layer (131) intersects the axis of the fixed rod (122) and the included angle is acute; the outer ring of the outer layer (131) is provided with a second bevel gear, which meshes with a first bevel gear (121) for transmission. The outer layer (131) has a mounting part at the center of its end face, and the radial arm (112) has a support rod on its inner side. One end of the support rod is mounted to the mounting part via a bearing.

6. The lamp housing coating machine according to claim 4, characterized in that: The inner side of the outer layer (131) is provided with an annular protrusion (1311), and the outer side of the outer layer (131) is provided with a positioning hole (1312). The positioning hole (1312) is coaxially arranged with the protrusion (1311), and the inner diameter of the protrusion (1311) is larger than the diameter of the positioning hole (1312). The outer periphery of the inner layer component (132) is provided with a second protrusion (1321), and the outer layer of the inner layer component (132) is provided with a feed hole (1322). The inner diameter of the second protrusion (1321) is equal to the diameter of the feed hole (1322), and the outer diameter of the second protrusion (1321) is smaller than the inner diameter of the first protrusion (1311). An annular gap is formed between the second protrusion (1321) and the first protrusion (1311) to accommodate the opening end of the lamp housing.

7. The lamp housing coating machine according to claim 6, characterized in that: The positioning holes (1312) are provided in multiple sets, and the positioning holes (1312) are arranged circumferentially along the axis of the outer layer (131), and the multiple sets of positioning holes (1312) are evenly distributed radially along the outer layer (131). The feed hole (1322) and the positioning hole (1312) correspond one-to-one and are coaxially arranged. The diameter of the feed hole (1322) is larger than the diameter of the positioning hole (1312).

8. The lamp housing coating machine according to claim 1, characterized in that: The discharge mechanism (2) includes a base platform (21), a lifting platform (22), and a control arm. The bottom of the base platform (21) is fixedly connected to the bottom of the coating chamber. The platform of the lifting platform (22) is located above the base platform (21). The lifting guide column of the lifting platform (22) slides through the center of the base platform (21) and is equipped with a lifting drive component at its end. One end of the control arm is hinged to the side wall of the platform of the lifting platform (22), and the other end of the control arm is hinged to the side wall of the base platform (21). The outer side of the control arm is fixedly connected to the nozzle component.

9. The lamp housing coating machine according to claim 8, characterized in that: The control arm is provided in multiple sets, and the nozzle is provided in a one-to-one correspondence with the control arm. The control arm is arranged circumferentially along the axis of the lifting platform (22). The control arm includes a first link (23) and a second link (24). One end of the first link (23) is hinged to the base platform (21), and the other end is hinged to the second link (24). The other end of the second link (24) is hinged to the lifting platform (22). The outer side of the second link (24) is fixedly connected to the corresponding nozzle.

10. The lamp housing coating machine according to claim 3, characterized in that: It also includes a recycling mechanism (4), the input end of which is connected to the through hole (123) via a pipeline, and the output end of which is connected to the evaporation source (3) via a pipeline.

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