Organic photoconductor drum secondary coating apparatus and process

Abstract

This invention discloses a secondary coating device and process for an organic photoconductor drum, applied in the technical field of secondary coating devices for organic photoconductor drums. The key technical points are: a base, on which an aluminum substrate loading seat and an aluminum substrate unloading conveyor line are fixedly connected; a coating station on the base is fixedly connected to a coating tank, which contains a viscosity stratification component for controlling the viscosity of the conductive slurry in the vertical direction by stratifying and temperature-controlled slurry; and a conveying component movably connected to the base, based on a lifting conveyor component, for transporting several aluminum substrates from the aluminum substrate loading seat to the coating tank. The technical effects are: improved coating uniformity, increased precision of the organic photoconductor drum, and extended service life.

Description

Technical Field

[0001] This invention relates to the technical field of organic photoconductor drum secondary coating device, and particularly to organic photoconductor drum secondary coating device and process. Background Technology

[0002] Organic photoconductive drums are the core photosensitive components of electrostatic imaging devices such as laser printers, digital copiers, and multifunction printers. They convert digital image information into visible printed images through photoconductivity and electrostatic induction, and are widely used in office automation, printing, and packaging. From the inside out, an organic photoconductive drum consists of a conductive substrate, a conductive layer, a photoconductive layer, and a protective layer. The conductive layer, as a crucial transition layer connecting the conductive substrate and the photoconductive layer, functions to ensure uniform charge conduction, prevent charge leakage, buffer stress between the substrate and the photoconductive layer, and provide a smooth and stable substrate for the photoconductive layer. The uniformity of the conductive layer coating directly determines the clarity, stability, and lifespan of the final printed image.

[0003] Currently, the coating of conductive layers in existing technologies mostly adopts the dip-coating pull-out method: an aluminum substrate, after precision cleaning and surface activation treatment, is vertically immersed in a prepared conductive paste. After the substrate surface is fully wetted, it is pulled upwards at a set speed to form a continuous wet film of paste on the substrate surface, followed by thermosetting to form a dense conductive layer. However, in the existing dip-coating pull-out process, the conductive paste adhering to the substrate surface will slide downwards vertically under the influence of gravity during the pull-out process. This results in less conductive paste adhering to the top area of ​​the aluminum substrate than the bottom area, ultimately forming an uneven coating with a thin top and a thick bottom. This directly affects the uniformity of charge conduction in the conductive layer, leading to a decrease in the accuracy of electrostatic latent image formation in the photoconductor layer. At the same time, the thinner conductive layer at the top will wear down first due to insufficient wear resistance during long-term use, causing problems such as coating peeling and charge leakage, significantly shortening the service life of the organic photoconductor drum. Therefore, it is necessary to improve the existing conductive layer coating process of organic photoconductor drums on the market to improve coating uniformity. Summary of the Invention

[0004] The primary objective of this invention is to provide a secondary coating apparatus for an organic photoconductor drum, which has the advantages of improving coating uniformity, increasing the precision of the organic photoconductor drum, and extending its service life.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an organic photoconductor drum secondary coating device, comprising a base, wherein an aluminum substrate loading seat and an aluminum substrate unloading conveyor line for unloading the aluminum substrate are fixedly connected to the base; a coating station of the base is fixedly connected to a coating tank, wherein a viscosity stratification component is provided in the coating tank for stratifying and temperature-controlling the conductive slurry in the coating tank to control the viscosity of the conductive slurry in the vertical direction in the coating tank; and a conveying component for transporting several aluminum substrates from the aluminum substrate loading seat to the coating tank is movably connected to the base based on a lifting conveyor component.

[0006] The invention is further configured such that: a plurality of coating tubes are uniformly arranged and connected in the coating tank along the vertical direction for inserting aluminum substrates to achieve coating; a storage chamber for storing conductive slurry is fixedly connected to the bottom of the coating tank and communicates with the coating tubes; a replenishment tube for replenishing conductive slurry into the storage chamber to maintain the liquid level in the coating tubes is fixedly connected to the storage chamber; and a cooling tube for cooling the conductive slurry in the storage chamber is also fixedly connected to the storage chamber.

[0007] The invention is further configured such that: the viscosity layering component includes several isolation plates fixedly connected at intervals along the vertical direction within the coating tank; the isolation plates have several fixing holes for the coating tube to pass through; the isolation plates divide the coating tank into at least three temperature control chambers; the temperature control chamber includes an upper temperature control chamber, at least one middle temperature control chamber, and a lower temperature control chamber; the temperature control chamber is filled with heat exchange fluid and a heating tube for heating the heat exchange fluid to heat the conductive slurry in the coating tube during the coating state to adjust the viscosity of the conductive slurry in the vertical direction; at least one temperature sensor for detecting the temperature of the heat exchange fluid is fixedly installed within the temperature control chamber.

[0008] The present invention is further configured such that: a liquid level sensor for detecting the height of the conductive slurry is provided on the inner side of the coating tube; when the aluminum substrate is inserted into the coating tube, the liquid level of the conductive slurry in the coating tube rises and the liquid level of the conductive slurry is 2-5 mm lower than the top surface of the aluminum substrate.

[0009] The present invention is further configured such that: the temperature of the heat exchange fluid in the lower temperature control cavity is between 33-37°C, and the viscosity of the corresponding conductive slurry is between 500-800 mPa·s; the temperature of the heat exchange fluid in the upper temperature control cavity is between 23-27°C, and the viscosity of the corresponding conductive slurry is between 1200-1500 mPa·s; and the temperature of the heat exchange fluid in the middle temperature control cavity is between 28-32°C, and the viscosity of the corresponding conductive slurry is between 800-1200 mPa·s.

[0010] The present invention is further configured such that: the lifting and conveying assembly includes a horizontal conveying screw slide fixedly connected to the base in the horizontal direction and a vertical lifting screw slide fixedly connected to the sliding end of the horizontal conveying screw slide in the vertical direction, wherein the lifting end of the vertical lifting screw slide is fixedly connected to a mounting base for mounting the conveying assembly.

[0011] The present invention is further configured such that: the conveying assembly includes a plurality of vent pipes evenly arranged in the vertical direction on the mounting base and an expansion airbag fixedly connected to the vent pipes; the bottom of the vent pipe is fixedly connected to a tapered guide block with a tapered structure for insertion into the top hole of the aluminum substrate.

[0012] The second objective of this invention is to provide a secondary coating process for organic photoconductor drums, which has the advantages of improving coating uniformity, increasing the precision of the organic photoconductor drum, and extending its service life.

[0013] The above-mentioned technical objective of this invention is achieved through the following technical solution: a secondary coating process for an organic photoconductor drum, using the organic photoconductor drum secondary coating apparatus as described in the above technical solution; comprising: Step 1: Preheat the viscosity stratification component. Start the heating tubes in each temperature control chamber to heat and stabilize the heat exchange liquid in the upper, middle, and lower temperature control chambers at 23-27℃, 28-32℃, and 33-37℃, respectively. When the temperature sensor detects that the temperature of the heat exchange liquid in the temperature control chamber has reached the set temperature and the temperature stops fluctuating, inject conductive slurry into the storage chamber through the replenishment tube until the liquid level sensor detects that the liquid level of the conductive slurry in the coating tube has reached the set height. The cooling tube cools down the conductive slurry in the storage chamber so that the temperature of the conductive slurry in the storage chamber does not exceed 23℃. Step 2: The lifting and conveying assembly drives the transport assembly to lift and transport the aluminum substrate on the aluminum substrate loading seat to the top of the coating tube in the coating tank. Step 3: The lifting and conveying assembly controls the aluminum substrate to be vertically inserted into the conductive slurry in the coating tube along the axis of the coating tube. The level of the conductive slurry rises and is maintained for a set time T1 to complete the first immersion coating. The lifting and conveying assembly then pulls the aluminum substrate upward until the bottom surface of the aluminum substrate rises into the upper temperature control chamber and then stops pulling. Step 4: The lifting and conveying assembly continues to lower the aluminum substrate and maintains it for the set time T2. The lifting and conveying assembly then lifts the aluminum substrate upward until the bottom surface of the aluminum substrate is completely separated from the conductive slurry surface. The lifting and conveying assembly then transports the aluminum substrate to a fixed station for curing. Step 5: The lifting and conveying assembly transports the coated and cured aluminum substrate to the aluminum substrate unloading conveyor line for unloading.

[0014] The present invention is further configured such that: in step 3, the time T1 is set between 10-30 seconds, in step 4, the time T2 is set between 10-15 seconds, and in step 3, the upward pulling speed of the aluminum substrate is 12-15 cm / min.

[0015] The present invention is further configured such that: in step 4, when the bottom surface of the aluminum substrate is located in the lower temperature control cavity, the upward lifting speed is 5-8 cm / min; when the bottom surface of the aluminum substrate is located in the middle temperature control cavity, the upward lifting speed is 8-12 cm / min; and when the bottom surface of the aluminum substrate is located in the lower temperature control cavity, the upward lifting speed is 12-15 cm / min.

[0016] In summary, the present invention has the following beneficial effects: 1. By setting a viscosity layering component in the coating tank, the conductive slurry can be adjusted in the vertical direction. The lower temperature control chamber is set for the low viscosity conductive slurry to promote rapid and full wetting of the aluminum substrate, and the upper temperature control chamber is set for the high viscosity conductive slurry to reduce the problem of uneven coating caused by gravity dripping of the conductive slurry during the lifting process. This avoids the problem of poor wear resistance caused by the thin conductive layer on the top of the aluminum substrate and improves the service life. 2. A two-stage coating process is implemented. After the aluminum substrate is first lifted upwards until its bottom surface reaches the upper temperature control chamber, it is immersed in the conductive slurry again for a second coating. The first coating forms a stable conductive layer on the aluminum substrate surface, while the second coating allows the slurry already adhering to the aluminum substrate surface to bond with the upper high-viscosity slurry, filling in any localized thin spots that may have occurred during the first coating. Simultaneously, the high viscosity of the upper high-viscosity slurry inhibits the slurry from sliding down during the second lifting process. Furthermore, the lifting speed is adjusted as follows: when the bottom surface of the aluminum substrate is in the lower temperature control chamber, the lifting speed is slower; when it is in the middle temperature control chamber, the lifting speed is uniform; and when it is in the upper temperature control chamber, the lifting speed is faster. This ensures that the upper part of the aluminum substrate detaches slowly from the upper high-viscosity slurry, while the lower part detaches quickly, preventing the lower conductive layer from becoming thicker and further guaranteeing the uniformity of the conductive layer thickness. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this embodiment; Figure 2 This is a cross-sectional view of the coating tank and viscosity layering assembly in this embodiment; Figure 3 yes Figure 2 Enlarged schematic diagram of part A.

[0018] Reference numerals: 1. Base; 2. Aluminum substrate loading seat; 3. Aluminum substrate unloading conveyor line; 4. Coating tank; 41. Coating pipe; 42. Liquid storage chamber; 43. Replenishment pipe; 44. Cooling pipe; 5. Viscosity stratification component; 51. Isolation plate; 52. Upper temperature control chamber; 53. Middle temperature control chamber; 54. Lower temperature control chamber; 55. Heating pipe; 56. Temperature sensor; 6. Lifting and conveying component; 61. Horizontal conveying screw slide; 62. Vertical lifting screw slide; 63. Mounting base; 7. Handling component; 71. Vent pipe; 72. Inflatable air bladder; 73. Conical guide block. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Example 1: refer to Figures 1 to 3 An organic photoconductor drum secondary coating device includes a base 1, on which an aluminum substrate loading seat 2 and an aluminum substrate unloading conveyor line 3 are fixedly connected. The aluminum substrate unloading conveyor line 3 is equipped with a tray for positioning and supporting the aluminum substrate. A coating tank 4 is fixedly connected to the coating station on the base 1. A thermosetting device is installed between the aluminum substrate unloading conveyor line 3 and the coating tank 4 to achieve curing after coating. A viscosity stratification component 5 is installed in the coating tank 4 to control the viscosity of the conductive slurry in the vertical direction by stratifying and temperature-controlling the conductive slurry within the coating tank 4. A lifting conveyor component 6 is mounted on the base 1. The device is dynamically connected to a conveying assembly 7 for transporting several aluminum substrates from the aluminum substrate loading seat 2 to the coating tank 4. During coating, the conveying assembly 7 is driven by the lifting and conveying assembly 6 to lift and convey the aluminum substrates on the aluminum substrate loading seat 2 to the top of the coating tube 41 in the coating tank 4. Then, the lifting and conveying assembly 6 controls the aluminum substrates to be vertically inserted into the conductive slurry of the coating tube 41 along the axis of the coating tube 41 for coating. After coating is completed, the lifting and conveying assembly 6 lifts the aluminum substrates upwards and removes them from the coating tank 4 and conveys them to the thermosetting equipment for curing. Finally, the cured aluminum substrates are transported to the aluminum substrate unloading conveyor line 3 to achieve automatic unloading.

[0021] refer to Figures 2 to 3Specifically, several coating tubes 41 are evenly arranged and connected in the coating tank 4, arranged vertically for inserting aluminum substrates to achieve coating. A storage chamber 42, connected to the coating tubes 41 and used to store conductive slurry, is fixedly connected to the bottom of the coating tank 4. A replenishment tube 43 is fixedly connected to the storage chamber 42 to replenish conductive slurry and maintain the liquid level in the coating tubes 41, and a cooling tube 44 is fixedly connected to the storage chamber 42 to cool the conductive slurry. Because the coating tubes 41 are connected to the storage chamber 42, the liquid level of the conductive slurry in each coating tube 41 is at the same horizontal level. When the aluminum substrate is inserted into the coating tube 41, the coating... The conductive slurry level rises inside the coating tube 41, enabling simultaneous wetting and coating of multiple aluminum substrates and improving coating efficiency. A level sensor is installed inside the coating tube 41 to detect the height of the conductive slurry level. When the aluminum substrate is inserted into the coating tube 41, the level of the conductive slurry in the coating tube 41 rises and the height of the conductive slurry level is 2-5mm lower than the top surface of the aluminum substrate. When the level sensor detects that the height of the conductive slurry level in the coating tube 41 is lower than the limit, the conductive slurry is automatically introduced into the storage chamber 42 through the replenishment tube 43 to maintain a constant level. The temperature of the conductive slurry in the storage chamber 42 is controlled by the cooling tube 44, thereby keeping the conductive slurry in a low viscosity state.

[0022] refer to Figures 2 to 3Specifically, the viscosity separation component 5 includes several isolation plates 51 fixedly connected at intervals along the vertical direction within the coating tank 4. Several fixing holes are provided on the isolation plates 51 for the coating tubes 41 to pass through. The isolation plates 51 divide the coating tank 4 into at least three temperature control chambers, including an upper temperature control chamber 52, at least one middle temperature control chamber 53, and a lower temperature control chamber 54. Each temperature control chamber contains a heat exchange fluid and a heating tube 55 for heating the heat exchange fluid to heat the conductive slurry within the coating tubes 41 during the coating process, thereby adjusting the viscosity of the conductive slurry in the vertical direction. The isolation plates 51 separate the various... The heat exchange fluid in the temperature control chamber also insulates against heat. At least one temperature sensor 56 is fixed inside the temperature control chamber to detect the temperature of the heat exchange fluid. When the aluminum substrate is inserted into the coating tube 41, the level of the conductive slurry in the coating tube 41 rises. At this time, the heat exchange fluid in the upper temperature control chamber 52, middle temperature control chamber 53, and lower temperature control chamber 54 exchanges heat with the conductive slurry at the corresponding height through the tube wall of the coating tube 41 to raise the temperature of the conductive slurry. When the temperature of the heat exchange fluid in the lower temperature control chamber 54 is between 33-37℃, the viscosity of the corresponding conductive slurry is between 500-800 mPa·s. The temperature of the heat exchange fluid in the first-layer temperature control chamber 52 is between 23-27℃, and the viscosity of the corresponding conductive slurry is between 1200-1500 mPa·s. The temperature of the heat exchange fluid in the second-layer temperature control chamber 53 is between 28-32℃, and the viscosity of the corresponding conductive slurry is between 800-1200 mPa·s. The lower-layer temperature control chamber 54 is set to correspond to the low-viscosity conductive slurry to promote rapid and full wetting of the aluminum substrate, while the upper-layer temperature control chamber 52 is set to correspond to the high-viscosity conductive slurry to reduce the problem of uneven coating caused by gravity dripping of the conductive slurry during the lifting process, thereby avoiding the problem of insufficient conductive layer thickness on the top of the aluminum substrate. The thinner conductive layer results in poor wear resistance. However, the temperature-controlled cavity 53 in the middle layer achieves viscosity transition, avoiding streaks or delamination defects in the conductive layer. Since the conductive slurry is a suspended polymer solution, its viscosity changes with temperature in two characteristic ranges: the low-temperature range (10-25℃) shows a rapid decrease in viscosity as the temperature rises; the medium-high temperature range (25-50℃) shows a slow decrease in viscosity as the temperature rises. By controlling the temperature of the conductive slurry, the viscosity of the conductive slurry can be flexibly adjusted, thereby reducing the problem of the conductive layer being thin on top and thick on the bottom due to gravity, and improving the uniformity of the conductive layer coating.

[0023] refer to Figure 1Specifically, the lifting and conveying assembly 6 includes a horizontal conveying screw slide 61 fixedly connected to the base 1 in the horizontal direction and a vertical lifting screw slide 62 fixedly connected to the sliding end of the horizontal conveying screw slide 61 in the vertical direction. A mounting base 63 for installing the handling assembly 7 is fixedly connected to the lifting end of the vertical lifting screw slide 62. The horizontal conveying screw slide 61 and the vertical lifting screw slide 62 cooperate to realize the conveying and lifting of the aluminum substrate, and can improve the displacement accuracy of the aluminum substrate in the horizontal and vertical directions, thereby ensuring the accuracy of the coating process. The transport assembly 7 includes several vent pipes 71 evenly arranged vertically on the mounting base 63 and an expansion airbag 72 fixedly connected to the vent pipes 71. A tapered guide block 73 with a tapered structure is fixedly connected to the bottom of the vent pipe 71 for insertion into the top hole of the aluminum substrate. After the vent pipe 71 and the expansion airbag 72 are driven down into the mounting hole at the top of the aluminum substrate by the vertical lifting screw slide 62, the vent pipe 71 is vented, causing the expansion airbag 72 to expand and support the inner wall of the aluminum substrate, thereby realizing the transport and handling of the aluminum substrate and avoiding the problem of surface damage caused by clamping the outer wall of the aluminum substrate.

[0024] Example 2: refer to Figure 2 The organic photoconductor drum secondary coating process, using the organic photoconductor drum secondary coating apparatus as shown in Example 1, includes: Step 1: Preheat the viscosity stratification component 5, start the heating tubes 55 in each temperature control chamber to heat and stabilize the heat exchange liquid in the upper temperature control chamber 52, middle temperature control chamber 53, and lower temperature control chamber 54 at 23-27℃, 28-32℃, and 33-37℃ respectively. When the temperature sensor 56 detects that the temperature of the heat exchange liquid in the temperature control chamber has reached the set temperature and the temperature stops fluctuating, inject conductive slurry into the storage chamber 42 through the replenishment tube 43 until the liquid level sensor detects that the liquid level of the conductive slurry in the coating tube 41 has reached the set height. The cooling tube 44 cools down the conductive slurry in the storage chamber 42 so that the temperature of the conductive slurry in the storage chamber 42 does not exceed 23℃. Step 2: The lifting and conveying assembly 6 drives the transport assembly 7 to lift and transport the aluminum substrate on the aluminum substrate loading seat 2 to the top of the coating tube 41 of the coating tank 4. Step 3: The lifting and conveying assembly 6 controls the aluminum substrate to be vertically inserted into the conductive slurry of the coating tube 41 along the axis of the coating tube 41. The level of the conductive slurry rises and is maintained for a set time T1 to complete the first immersion coating. The lifting and conveying assembly 6 then pulls the aluminum substrate upward until the bottom surface of the aluminum substrate rises into the upper temperature control chamber 52 and then stops pulling. Step 4: The lifting and conveying assembly 6 continues to lower the aluminum substrate and maintains it for the set time T2. The lifting and conveying assembly 6 then lifts the aluminum substrate upward until the bottom surface of the aluminum substrate is completely separated from the conductive slurry surface. The lifting and conveying assembly 6 then transports the aluminum substrate to a fixed station for curing. Step 5: The lifting and conveying assembly 6 transports the coated and cured aluminum substrate to the aluminum substrate unloading conveyor line 3 for unloading.

[0025] Specifically, in step 3, the time T1 is set between 10-30 seconds, in step 4, the time T2 is set between 10-15 seconds, and in step 3, the upward pulling speed of the aluminum substrate is 12-15 cm / min.

[0026] Specifically, in step 4, when the bottom surface of the aluminum substrate is located in the lower temperature control cavity 54, the upward lifting speed is 5-8 cm / min; when the bottom surface of the aluminum substrate is located in the middle temperature control cavity 53, the upward lifting speed is 8-12 cm / min; and when the bottom surface of the aluminum substrate is located in the lower temperature control cavity 54, the upward lifting speed is 12-15 cm / min.

[0027] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make inventive modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An organic photoconductor drum secondary coating device, comprising a base (1), wherein an aluminum substrate loading seat (2) and an aluminum substrate unloading conveyor line (3) for unloading the aluminum substrate are respectively fixedly connected to the base (1); characterized in that, The base (1) is fixedly connected to a coating tank (4). The coating tank (4) is equipped with a viscosity layering component (5) for layering and temperature control of the conductive slurry in the coating tank (4) to control the viscosity of the conductive slurry in the vertical direction in the coating tank (4). The base (1) is movably connected to a conveying component (6) for transporting several aluminum substrates from the aluminum substrate loading seat (2) to the coating tank (4).

2. The organic photoconductor drum secondary coating device according to claim 1, characterized in that, The coating tank (4) is uniformly arranged with several coating tubes (41) arranged vertically for inserting aluminum substrates to achieve coating. The bottom of the coating tank (4) is fixedly connected to a storage chamber (42) that communicates with the coating tubes (41) and is used to store conductive slurry. The storage chamber (42) is fixedly connected to a replenishment tube (43) for replenishing conductive slurry into the storage chamber (42) to maintain the liquid level in the coating tubes (41) and a cooling tube (44) for cooling the conductive slurry in the storage chamber (42).

3. The organic photoconductor drum secondary coating device according to claim 2, characterized in that, The viscosity layering component (5) includes several isolation plates (51) fixedly connected at intervals along the vertical direction in the coating tank (4). The isolation plates (51) have several fixing holes for the coating tube (41) to pass through. The isolation plates (51) divide the coating tank (4) into at least three temperature control chambers. The temperature control chamber includes an upper temperature control chamber (52), at least one middle temperature control chamber (53), and a lower temperature control chamber (54). The temperature control chamber is filled with heat exchange fluid and a heating tube (55) for heating the heat exchange fluid to heat the conductive slurry in the coating tube (41) in the coating state to adjust the viscosity of the conductive slurry in the vertical direction. At least one temperature sensor (56) for detecting the temperature of the heat exchange fluid is fixedly installed in the temperature control chamber.

4. The organic photoconductor drum secondary coating device according to claim 3, characterized in that, The coating tube (41) is equipped with a liquid level sensor for detecting the height of the conductive slurry. When the aluminum substrate is inserted into the coating tube (41), the level of the conductive slurry in the coating tube (41) rises and the height of the conductive slurry is 2-5 mm lower than the top surface of the aluminum substrate.

5. The organic photoconductor drum secondary coating device according to claim 3, characterized in that, The temperature of the heat exchange fluid in the lower temperature control chamber (54) is between 33-37°C, and the viscosity of the corresponding conductive slurry is between 500-800 mPa·s. The temperature of the heat exchange fluid in the upper temperature control chamber (52) is between 23-27°C, and the viscosity of the corresponding conductive slurry is between 1200-1500 mPa·s. The temperature of the heat exchange fluid in the middle temperature control chamber (53) is between 28-32°C, and the viscosity of the corresponding conductive slurry is between 800-1200 mPa·s.

6. The organic photoconductor drum secondary coating device according to claim 1, characterized in that, The lifting and conveying assembly (6) includes a horizontal conveying screw slide (61) fixedly connected to the base (1) in the horizontal direction and a vertical lifting screw slide (62) fixedly connected to the sliding end of the horizontal conveying screw slide (61) in the vertical direction. The lifting end of the vertical lifting screw slide (62) is fixedly connected to a mounting base (63) for installing the conveying assembly (7).

7. The organic photoconductor drum secondary coating apparatus according to claim 6, characterized in that, The transport assembly (7) includes several vent pipes (71) evenly arranged vertically on the mounting base (63) and an inflatable airbag (72) fixedly connected to the vent pipes (71). The bottom of the vent pipes (71) is fixedly connected to a tapered guide block (73) with a tapered structure for insertion into the top hole of the aluminum substrate.

8. A secondary coating process for an organic photoconductor drum, using the secondary coating apparatus for an organic photoconductor drum as described in claim 5; characterized in that, include: Step 1: Preheat the viscosity stratification component (5), start the heating tube (55) in each temperature control chamber so that the heat exchange liquid in the upper temperature control chamber (52), middle temperature control chamber (53) and lower temperature control chamber (54) is heated and stabilized at 23-27℃, 28-32℃ and 33-37℃ respectively. When the temperature sensor (56) detects that the temperature of the heat exchange liquid in the temperature control chamber has reached the set temperature and the temperature stops fluctuating, inject conductive slurry into the storage chamber (42) through the replenishment tube (43) until the liquid level sensor detects that the liquid level of the conductive slurry in the coating tube (41) has reached the set height. The cooling tube (44) cools down the conductive slurry in the storage chamber (42) so that the temperature of the conductive slurry in the storage chamber (42) does not exceed 23℃. Step 2: The lifting and conveying assembly (6) drives the transport assembly (7) to lift and transport the aluminum substrate on the aluminum substrate loading seat (2) to the top of the coating tube (41) of the coating tank (4); Step 3: The lifting and conveying assembly (6) controls the aluminum substrate to be vertically inserted into the conductive slurry of the coating tube (41) along the axis of the coating tube (41). The surface of the conductive slurry rises and is maintained for a set time T1 to complete the first immersion coating. The lifting and conveying assembly (6) drives the aluminum substrate to be lifted up until the bottom surface of the aluminum substrate rises into the upper temperature control cavity (52) and then stops lifting. Step 4: The lifting and conveying assembly (6) continues to lower the aluminum substrate and maintains it for the set time T2. The lifting and conveying assembly (6) lifts the aluminum substrate upward until the bottom surface of the aluminum substrate is completely separated from the conductive slurry surface. The lifting and conveying assembly (6) then transports the aluminum substrate to a fixed station for curing. Step 5: The lifting and conveying assembly (6) transports the coated and cured aluminum substrate to the aluminum substrate unloading conveyor line (3) for unloading.

9. The secondary coating process for the organic photoconductor drum according to claim 8, characterized in that, In step 3, the time T1 is set between 10-30 seconds, and in step 4, the time T2 is set between 10-15 seconds. In step 3, the upward pulling speed of the aluminum substrate is 12-15 cm / min.

10. The secondary coating process for the organic photoconductor drum according to claim 9, characterized in that, In step 4, when the bottom surface of the aluminum substrate is in the lower temperature control cavity (54), the upward pulling speed is 5-8 cm / min; when the bottom surface of the aluminum substrate is in the middle temperature control cavity (53), the upward pulling speed is 8-12 cm / min; and when the bottom surface of the aluminum substrate is in the lower temperature control cavity (54), the upward pulling speed is 12-15 cm / min.

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