Method for modifying B1B2 equipment into 3C2B equipment

Abstract

The invention relates to a modification method for modifying B1B2 equipment into 3C2B equipment, and belongs to the technical field of automobile coating equipment optimization modification. The method comprises the steps that a drying line on the downstream of an original varnish line is integrally moved forwards to a set position, and a first space used for arranging a new varnish line is formed between the original varnish line and the drying line; the primary-color paint line is transferred into the first space from the upstream of the original varnish line, and a second space used for additionally arranging a floating coat drying and polishing line is formed between the floating coat line and the original varnish line; a paint spraying device of the original varnish line and a paint spraying device of the primary-color paint line are exchanged, the primary-color paint line is transformed into a new varnish line, and meanwhile the original varnish line is transformed into the new-color paint line; a floating coat drying furnace and a floating coat polishing line are sequentially additionally arranged in the second space, the floating coat drying furnace is located on the upstream of the floating coat polishing line, and the floating coat drying furnace and the floating coat polishing line jointly form a floating coat drying polishing line. According to the refitting method, the problems that the refitting cost is high, the construction period is long, the utilization rate of original equipment is low and resources are wasted when the B1B2 equipment is refitted into the 3C2B equipment are solved.

Description

Technical Field

[0001] The present application relates to the technical field of optimization and modification of automobile painting equipment, and in particular to a method for modifying B1B2 equipment into 3C2B equipment. Background Art

[0002] With the increasing demand for multi-color paint layers (primer coat - drying - basecoat - clearcoat - drying, a 3C2B process) in automobile manufacturing and industrial coating processes, existing B1B2 coating equipment has limitations in process layout (primer coat - basecoat - clearcoat - drying, a 3C2B process), process optimization, and quality control.

[0003] In related technologies, changing the B1B2 coating process to the 3C2B coating process usually requires the overall reconstruction of the production line. Traditional solutions rely on the construction of new mid-coat drying lines and color paint lines, resulting in high equipment investment costs (such as adding new spray booths and conveying systems), long construction periods (usually taking several months), and the structural characteristics of the original equipment are difficult to be compatible with the 3C2B process flow, resulting in low equipment utilization and waste of resources.

[0004] Therefore, it is necessary to conduct research and improvements on the above problems and provide a method for converting B1B2 equipment into 3C2B equipment without large-scale reconstruction, short construction period and controllable cost, so as to improve the flexibility of the coating process and the efficiency of equipment utilization. Summary of the Invention

[0005] In response to the deficiencies or one of the deficiencies raised in the above-mentioned background technology, an embodiment of the present application provides a method for converting a B1B2 device into a 3C2B device to solve the problems of high conversion cost, long construction period, low utilization rate of original equipment and waste of resources in the related technology of converting a B1B2 device into a 3C2B device.

[0006] This embodiment of the present application provides a method for converting a B1B2 device into a 3C2B device, including the following steps: S1. Move the drying line downstream of the original varnish line forward to a set position as a whole, so that a first space for arranging a new varnish line is formed between the original varnish line and the drying line; S2. Move the primary color paint line from upstream of the original clear coat line into the first space, and form a second space between the mid-coat line and the original clear coat line for adding a mid-coat drying and polishing line; S3. Swap the spraying devices of the original varnish line and the primary color paint line, transform the primary color paint line into the new varnish line, and at the same time transform the original varnish line into the new color paint line; S4. Add a mid-coat drying furnace and a mid-coat polishing line in sequence in the second space, wherein the mid-coat drying furnace is located upstream of the mid-coat polishing line, and the two together form the mid-coat drying and polishing line.

[0007] In some embodiments, S4, sequentially adding a mid-coat drying furnace and a mid-coat polishing line in the second space, wherein the mid-coat drying furnace is located upstream of the mid-coat polishing line, and the two together form the mid-coat drying and polishing line, comprises the following steps: S41, dividing the varnish drying furnace of the drying line into two sections, and moving one section into the second space to be arranged as a mid-coat drying furnace; S42. Add a mid-coat polishing line in the second space, the mid-coat drying furnace is located upstream of the mid-coat polishing line, and the two together form the mid-coat drying polishing line.

[0008] In some embodiments, S4, a mid-coat drying furnace and a mid-coat polishing line are sequentially added in the second space, the mid-coat drying furnace is located upstream of the mid-coat polishing line, and the two together form the mid-coat drying and polishing line, further comprising the following steps: S43, sinking the midcoat grinding line so that the midcoat grinding line is lower than the midcoat line and the new color paint line in the vertical direction; S44. A downward conveyor chain and an upward conveyor chain are respectively set at both ends of the mid-coat polishing line to connect the mid-coat drying furnace and the new color paint line respectively.

[0009] In some embodiments, the mid-coat line includes a mid-coat spray booth and a mid-coat drying room connected to the mid-coat spray booth, the mid-coat spray booth is connected to a mid-coat air duct, and the mid-coat drying room is connected to a mid-coat drying air duct; The intermediate coating drying furnace is connected to the intermediate coating drying room, and the intermediate coating drying furnace is communicated with the intermediate coating drying air duct.

[0010] In some embodiments, the primary paint line includes a primary paint spraying room and a primary paint drying room connected to the primary paint spraying room, the primary paint spraying room is connected to a primary paint air duct, and the primary paint drying room is connected to a primary paint drying air duct; After the original varnish line is transformed into a new color paint line, the new color paint spraying room and the new color paint drying room of the new color paint line are connected to the original color paint air duct and the original color paint drying air duct respectively.

[0011] In some embodiments, the original varnish line includes an original varnish spraying room and an original varnish drying room connected to the original varnish spraying room, the original varnish spraying room is connected to an original varnish air duct, and the original varnish drying room is connected to an original varnish drying air duct; After the primary color paint line is moved and transformed into a new varnish line, the new varnish spraying room and the new varnish drying room of the new varnish line are connected to the original varnish air duct and the original varnish drying air duct respectively.

[0012] In some embodiments, S1, moving the drying line downstream of the original varnish line forward as a whole to a set position, includes the following steps: S11. Disconnect the varnish drying furnace of the drying line from the external water mist pipe, air duct, gas pipe, conveyor chain and ground welding points, and ensure the accuracy of subsequent restoration of the connection by marking the interface; S12. Arrange a temporary support device at the bottom of the varnish drying furnace to lift the entire varnish drying furnace off the ground; S13, arranging rollers at intervals along the moving path at the bottom of the varnish drying furnace as a moving support structure; S14, pulling the varnish drying furnace by the hoisting equipment, so that it moves forward to the set position under the support of the roller; S15. After the translation is completed, remove the copper pipe and reconnect the water mist pipe, air duct, gas pipe, conveyor chain and ground welding points, and verify the sealing and functionality of the interface.

[0013] In some embodiments, the roller is a hard copper tube, which is used to ground the varnish drying furnace as a whole to eliminate the accumulation of static electricity caused by friction or mechanical operation during the movement of the varnish drying furnace, and prevent the risk of sparks and explosions caused by static discharge.

[0014] In some embodiments, before disconnecting the varnish drying furnace of the drying line from the external water mist pipe, air duct, gas pipe, conveyor chain and ground welding points, a detection instrument is used to detect the gas concentration inside the varnish drying furnace. If the concentration is higher than the safety threshold, the fresh air system is turned on for ventilation until the concentration is qualified and the disconnection operation is started.

[0015] In some embodiments, ion cutting technology is used to cut off the connection points between the varnish drying furnace and the outside, and fire-proof cloth is set at the fire point for isolation. At the same time, construction workers wear anti-static equipment and use explosion-proof tools to eliminate the risk of static sparks.

[0016] The beneficial effects of the technical solution provided by this application include: The present application provides a method for converting a B1B2 device into a 3C2B device, the method comprising the following steps: S1. Move the drying line downstream of the original varnish line forward to a set position as a whole, so that a first space for arranging a new varnish line is formed between the original varnish line and the drying line; S2. Move the primary color paint line from upstream of the original clear coat line into the first space, and form a second space between the mid-coat line and the original clear coat line for adding a mid-coat drying and polishing line; S3. Swap the spraying devices of the original varnish line and the primary color paint line, transform the primary color paint line into the new varnish line, and at the same time transform the original varnish line into the new color paint line; S4. Add a mid-coat drying furnace and a mid-coat polishing line in sequence in the second space, wherein the mid-coat drying furnace is located upstream of the mid-coat polishing line, and the two together form the mid-coat drying and polishing line.

[0017] By reconstructing the spatial layout of the original varnish line and color paint line and utilizing the structural characteristics of the original equipment to achieve functional conversion, there is no need to build a new independent production line to meet the 3C2B process requirements.

[0018] By moving the drying line forward as a whole, the first space is released, and the original color paint line is moved to this space and transformed into a new varnish line. At the same time, the original varnish line is upgraded to a new color paint line by exchanging the paint spraying device, and finally a mid-coat drying and polishing line is added in the second space.

[0019] The reuse of old equipment (such as the original drying furnace and paint spraying equipment) and space optimization significantly reduced the renovation cost, shortened the construction period, and improved the utilization rate of the original equipment, effectively solving the problems of resource waste and long construction period in traditional renovation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic diagram of the structure of the B1B2 device before modification in the embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the modified 3C2B device according to the embodiment of the present application.

[0022] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Float coating line; 11. Float coating spray booth; 111. Float coating air duct; 12. Float coating drying room; 121. Float coating drying air duct; 2. Primary color paint line; 21. Primary color paint spray booth; 211. Primary color paint air duct; 22. Primary color paint drying room; 221. Primary color paint drying air duct; 3. Original varnish line; 31. Original varnish spray booth; 311. Original varnish air duct; 32. Original varnish drying room; 321. Original varnish drying air duct; 4. Drying line; 41. Varnish drying furnace; 5. Mid-coat drying and polishing line; 51. Mid-coat drying furnace; 52. Mid-coat polishing line; 53. Downward conveyor chain; 54. Upward conveyor chain; 6. New color paint line; 61. New color paint spray room; 62. New color paint drying room; 7. New varnish line; 71. New varnish spray room; 72. New varnish drying room. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] In response to the deficiencies or one of the deficiencies raised in the above-mentioned background technology, an embodiment of the present application provides a method for converting a B1B2 device into a 3C2B device to solve the problems of high conversion cost, long construction period, low utilization rate of original equipment and waste of resources in the related technology of converting a B1B2 device into a 3C2B device.

[0025] See also Figure 1 and Figure 2 As shown, the embodiment of the present application provides a method for converting a B1B2 device into a 3C2B device, including the following steps: S1, move the drying line 4 downstream of the original varnish line 3 forward to a set position as a whole, so that a first space for arranging the new varnish line 7 is formed between the original varnish line 3 and the drying line 4; S2, move the primary color paint line 2 from the upstream of the original varnish line 3 to the first space, and form a second space for adding a mid-coat drying and polishing line 5 between the mid-coat line 1 and the original varnish line 3; S3, swap the spraying devices of the original varnish line 3 and the primary color paint line 2, transform the primary color paint line 2 into the new varnish line 7, and at the same time transform the original varnish line 3 into the new color paint line 6; S4. A mid-coat drying furnace 51 and a mid-coat polishing line 52 are sequentially added in the second space. The mid-coat drying furnace 51 is located upstream of the mid-coat polishing line 52 , and the two together form the mid-coat drying and polishing line 5 .

[0026] The modification method of the embodiment of the present application reconstructs the spatial layout of the original varnish line 3 and the color paint line, and uses the structural characteristics of the original equipment to achieve functional conversion, so that the 3C2B process requirements can be met without the need to build a new independent production line.

[0027] Specifically, the drying line 4 is moved forward as a whole to release the first space, and the original color paint line 2 is moved to the space and transformed into a new varnish line 7. At the same time, the original varnish line 3 is upgraded to a new color paint line 6 by exchanging the paint spraying device, and finally a mid-coat drying and polishing line 5 is added in the second space.

[0028] The embodiments of the present application significantly reduce renovation costs (reducing investment in new equipment by over 50%), shorten the construction period (key steps can be completed within 10 days), and improve the utilization rate of existing equipment (reuse rate exceeds 70%) by reusing old equipment (such as the original drying furnace and paint spraying equipment) and optimizing space, effectively solving the problems of resource waste and lengthy construction periods in traditional renovations.

[0029] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a method for converting a B1B2 device into a 3C2B device. In S4 of the method for converting a B1B2 device into a 3C2B device, a mid-coat drying furnace 51 and a mid-coat polishing line 52 are sequentially added in the second space. The mid-coat drying furnace 51 is located upstream of the mid-coat polishing line 52, and the two together form a mid-coat drying and polishing line 5, which includes the following steps: S41, dividing the varnish drying oven 41 of the drying line 4 into two sections, and moving one section into the second space to form the intermediate coating drying oven 51; S42 , a mid-coat polishing line 52 is added in the second space, and the mid-coat drying furnace 51 is located upstream of the mid-coat polishing line 52 , and the two together form the mid-coat drying and polishing line 5 .

[0030] The modification method of the embodiment of the present application can reduce the need for purchasing and installing new equipment and further reduce the modification cost by dividing the varnish drying furnace 41 and reusing part of its structure as the mid-coat drying furnace 51.

[0031] Specifically, the varnish drying furnace 41 of the drying line 4 is divided into two sections along the process flow, one section is moved to the second space and adjusted to the function of the mid-coat drying furnace 51, and the other section remains in its original position to maintain the integrity of the drying line 4.

[0032] The segmentation and reuse design of the embodiment of the present application is based on the modular structure characteristics of the drying furnace. Through physical cutting and functional reconstruction, the utilization rate of the original equipment is further improved, while avoiding the waste of resources caused by the construction of a new mid-coat drying furnace 51.

[0033] In addition, the addition of the mid-coat polishing line 52 and the layout of the mid-coat drying furnace 51 cooperate to form a continuous mid-coat drying and polishing process flow, ensuring the consistency of coating quality.

[0034] In addition, after the varnish drying furnace 41 of the embodiment of the present application is divided, the shortening of the conveyor chain length in the varnish drying furnace 41 may affect the drying effect of the workpiece. The drying time can be compensated by further optimizing the conveyor chain operation parameters.

[0035] For example, the length ratio of the retaining section and the migration section of the divided varnish drying furnace 41 is adjusted according to actual process requirements. The original drying furnace can be divided into two sections with a ratio of 1:2. The migration section is supported by rollers and moved to the second space to serve as the mid-coat drying furnace 51. The retention section prolongs the residence time of the workpiece in the drying section by reducing the conveyor chain running speed (such as adjusting the speed from the original design of 0.5m / min to 0.3m / min), ensuring that the drying temperature and time parameters meet the process requirements.

[0036] At the same time, in the mid-coat drying furnace 51 of the migration section, the conveyor chain speed is increased (for example, adjusted to 0.6 m / min) to match the rhythm requirements of the mid-coat process, and ultimately a balanced drying effect is achieved in the overall process flow.

[0037] The above adjustment method is based on the thermal characteristics of the drying oven (such as the temperature distribution curve) and the coating curing requirements of the workpiece. The conveyor chain speed can be dynamically adjusted through the PLC control system, and thermal verification tests can be performed after the oven is divided (such as monitoring the surface temperature of the workpiece with an infrared thermometer) to ensure that the drying quality meets the standards.

[0038] The above embodiment does not require adding new heating equipment or extending the length of the drying oven. The drying efficiency problem after segmentation can be solved only by speed adjustment, which further reduces the equipment modification cost and shortens the construction period.

[0039] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a modification method for converting a B1B2 device into a 3C2B device. In S4 of the modification method for converting a B1B2 device into a 3C2B device, a mid-coat drying furnace 51 and a mid-coat polishing line 52 are sequentially added in the second space. The mid-coat drying furnace 51 is located upstream of the mid-coat polishing line 52, and the two together form the mid-coat drying and polishing line 5. The following steps are also included: S43, sinking the mid-coat polishing line 52 so that the mid-coat polishing line 52 is lower than the mid-coat line 1 and the new color paint line 6 in the vertical direction; S44. A downward conveying chain 53 and an upward conveying chain 54 are respectively provided at both ends of the mid-coat polishing line 52 to connect the mid-coat drying furnace 51 and the new color paint line 6 respectively.

[0040] In the embodiment of the present application, the workpiece after the middle coating is dried is transported to the middle coating polishing line 52 in the sinking area for processing by the downward conveying chain 53, and then the polished workpiece is returned to the new color paint line 6 by the upward conveying chain 54.

[0041] By utilizing the vertical space, the path length and energy consumption of the workpiece in horizontal transportation are reduced. At the same time, the grinding dust can be prevented from diffusing to the painting area due to air convection, thereby improving the cleanliness of the painting process and the surface quality of the workpiece.

[0042] In some other embodiments, the tracks of the down conveyor chain 53 and the up conveyor chain 54 are directly compatible with the existing conveyor chain system of the second-line grinding area, eliminating the need to re-lay tracks or adjust the workshop layout, further reducing the construction complexity and cost of the new equipment. This allows equipment modification to be completed by simply adding the down conveyor chain 53 and the up conveyor chain 54, eliminating the need to purchase other new equipment and facilities, and the equipment can be modified and put into use in a short period of time.

[0043] That is, by reusing existing conveyor chain facilities (with a reuse rate exceeding 80%), this embodiment can significantly reduce the procurement and construction of new equipment, shortening the switching period from the B1B2 structure to the 3C2B structure to within 10 days, and the new construction only involves local modifications, avoiding the waste of resources caused by large-scale reconstruction.

[0044] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a modification method for converting a B1B2 device into a 3C2B device. The modification method for converting a B1B2 device into a 3C2B device includes a mid-coat line 1 including a mid-coat spray booth 11 and a mid-coat drying room 12 connected to the mid-coat spray booth 11. The mid-coat spray booth 11 is connected to a mid-coat air duct 111, and the mid-coat drying room 12 is connected to a mid-coat drying air duct 121. The intermediate coating drying furnace 51 is connected to the intermediate coating drying room 12 , and the intermediate coating drying furnace 51 is communicated with the intermediate coating drying air duct 121 .

[0045] The embodiment of the present application realizes the functional connection between the mid-coat drying furnace 51 and the mid-coat drying room 12 by reusing the original mid-coat air duct 111 and the mid-coat drying air duct 121, avoiding the cost increase and construction complexity caused by the addition of new air ducts.

[0046] Specifically, the intermediate coating air duct 111 of the intermediate coating spraying room 11 is used to transport the paint mist and exhaust gas generated during the painting process, while the intermediate coating drying air duct 121 of the intermediate coating drying room 12 introduces the exhaust gas into the factory fresh air system for treatment through the original design.

[0047] The relocated mid-coat drying oven 51 is directly connected to the mid-coat drying duct 121 in the mid-coat drying room 12, creating a continuous mid-coat process flow. This ensures that the dried workpieces can be exhausted and ventilated through the existing duct system. While maintaining process functionality, the layout and structure of the original fresh air system are retained to the greatest extent possible, further reducing renovation costs.

[0048] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a modification method for converting a B1B2 device into a 3C2B device. The primary color paint line 2 of the modification method for converting a B1B2 device into a 3C2B device includes a primary color paint spraying room 21 and a primary color paint drying room 22 connected to the primary color paint spraying room 21. The primary color paint spraying room 21 is connected to a primary color paint air duct 211, and the primary color paint drying room 22 is connected to a primary color paint drying air duct 221. After the original varnish line 3 is transformed into the new color paint line 6, the new color paint spraying room 61 and the new color paint drying room 62 of the new color paint line 6 are connected to the original color paint air duct 211 and the original color paint drying air duct 221 respectively.

[0049] The embodiment of the present application achieves functional restoration of the equipment after migration by reusing the structural components of the original equipment (such as the paint booth, dry drying room and duct system), reducing construction complexity, further reducing material waste and modification costs, and without adjusting the original fresh air system layout.

[0050] Specifically, the paint spraying device of the original color paint line 2 is directly transplanted to the new color paint line 6, or the paint spraying parameters (such as spraying pressure and flow) are adjusted to adapt to the new color paint process requirements, without the need for adding independent paint spraying equipment.

[0051] The air duct system of primary paint line 2 is reconfigured by extending or rerouting the existing ducts, connecting the new paint spray booth 61 to the primary paint air duct 211, and the new paint drying booth 62 to the primary paint drying air duct 221. This reuse solution preserves the existing structure of the fresh air system, avoids changes in ventilation paths or increased energy consumption caused by the addition of new ducts, and further reduces renovation costs.

[0052] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a modification method for converting a B1B2 device into a 3C2B device. The original varnish line 3 of the modification method for converting a B1B2 device into a 3C2B device includes an original varnish spraying room 31 and an original varnish drying room 32 connected to the original varnish spraying room 31. The original varnish spraying room 31 is connected to an original varnish air duct 311, and the original varnish drying room 32 is connected to an original varnish drying air duct 321. After the primary color paint line 2 is moved and transformed into the new varnish line 7, the new varnish spraying room 71 and the new varnish drying room 72 of the new varnish line 7 are connected to the original varnish air duct 311 and the original varnish drying air duct 321 respectively.

[0053] The embodiment of the present application achieves functional restoration of equipment after migration by reusing the structural components of the original equipment (such as the paint booth, dry drying room and duct system), reducing construction complexity, material waste and modification costs, and there is no need to adjust the layout of the original fresh air system.

[0054] Specifically, the paint spraying device of the original varnish line 3 can be directly transplanted to the new varnish line 7, or the paint spraying parameters (such as spraying pressure and flow) can be adjusted to adapt to the new process requirements, without the need to purchase new paint spraying equipment; The existing varnish line 3's duct system was repurposed by extending or rerouting the existing ducts, connecting the new varnish spray booth 71 to the existing varnish duct 311, and the new varnish drying booth 72 to the existing varnish drying duct 321. This reuse solution ensures the airtightness and functionality of the duct system while preserving the original structure of the fresh air system, avoiding changes in ventilation paths or increased energy consumption caused by the addition of new ducts, and further reducing renovation costs.

[0055] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a method for converting a B1B2 device into a 3C2B device. S1 of the method for converting a B1B2 device into a 3C2B device is to move the drying line 4 downstream of the original varnish line 3 forward to a set position as a whole, including the following steps: S11, disconnect the varnish drying oven 41 of the drying line 4 from the external water mist pipe, air duct, air pipe, conveyor chain and ground welding points, and ensure the accuracy of subsequent restoration of the connection by marking the interface; S12, arranging a temporary support device at the bottom of the varnish drying oven 41 to lift the varnish drying oven 41 off the ground; S13, arranging rollers at intervals along the moving path at the bottom of the varnish drying furnace 41 as a moving support structure; S14, the varnish drying oven 41 is pulled by the hoisting equipment so that it moves forward to the set position under the support of the roller; S15. After the translation is completed, remove the copper pipe and reconnect the water mist pipe, air duct, gas pipe, conveyor chain and ground welding points, and verify the sealing and functionality of the interface.

[0056] The embodiment of the present application solves the relocation problem of large equipment (such as a flash drying furnace body that is 32 meters long and weighs 38 tons) through a modular mobile solution, while ensuring construction safety, reusing the moved equipment, and avoiding the high cost of traditional demolition and reconstruction.

[0057] For example, first confirm the fixed bracket range of the varnish drying furnace 41 and the upper air duct, water mist pipe, lower clean room, and maintenance platform, and establish the cutting route of the entire outer end.

[0058] The overall difference from B1B2 to 3C2B is that it is necessary to add a mid-coat drying section and a mid-coat section unloading channel to the mid-coat polishing area, and an upward channel from the polishing area to the color paint entrance area to the current B1B2 mid-coat to color paint section. Therefore, the estimated reserved length is 32m, which is exactly equal to the distance of the current B1B2 primary color paint section.

[0059] Therefore, it is considered to move the varnish drying furnace 41 forward as a whole by 32m, and move the primary color paint line 2 between the original varnish line 3 and the varnish drying furnace 41, so that the functions of the primary color paint line 2 and the original varnish line 3 are interchangeable, and then cut a section of the varnish drying furnace 41 and move it to the downstream of the mid-coat line 1 to serve as the mid-coat drying furnace 51.

[0060] Before the varnish drying oven 41 is moved, the upper air vent is cut horizontally and then the entire oven is moved horizontally. Fireproof cloth is used to isolate the end of the lower channel of the cutting path, and a fire observation platform is set up. Due to the drying oven's weight of 38 tons, 24 supporting columns are installed, and 24 inclined top jacks with a load capacity of 10,000 kg are used, placed at the 24 supporting points of the oven. At the same time, a slide rail channel is welded at the upper end, and four 10-ton load-bearing hoists are installed on the factory beams for upper suspension. Before dismantling the oven chamber, use a four-in-one detection instrument to determine the gas concentration in the chamber. If the concentration is too high, open fresh air for ventilation. When the concentration is qualified, start construction. Perform ion segmentation and dismantling on the connection between the air duct and the drying oven, the connection between the water mist plate and the drying oven, the clean room connection plate, and the maintenance platform. Remove the conveyor chain, perform ion cutting on the chain track to disconnect it from the drying oven, and use ion cutting to disconnect the welding point between the lower edge of the drying oven and the ground. Finally, the main body of the drying oven can be moved independently without interference from the surrounding air pipes, water pipes, conveyor chains, etc. Lift the drying oven 10cm from the ground using the hoist hanging from the top. Install support fixtures at the 24 pillars. The support fixtures can be mounted on the inclined jacks. The 24 jacks lift the drying oven to 10cm above the ground, gradually removing the load-bearing capacity of the hoist at the top, and using the jacks to support the oven. The 24 jacks are divided into two groups and symmetrically arranged on both sides of the drying oven. Twenty sections of 5cm diameter copper pipe are placed between adjacent jacks along the direction of movement. The jacks are gradually lowered from a height of 10cm to a height of 5cm, allowing the copper pipes to support the drying oven. Once the oven is under stable load, the hoist is pulled forward, dragging the entire drying oven forward. Twenty sections of copper pipe are pre-placed in the drying oven's forward path to ensure smooth forward movement. After the drying furnace reaches the designated position, the drying furnace is lifted by the jack, the copper tube is pulled out, the drying furnace is lifted by the upper hoist, and then the supporting fixture and 24 inclined top jacks are taken out. Finally, the hoist gradually lowers the drying furnace until the drying furnace is completely on the ground.

[0061] According to the pre-design, the drying furnace is moved forward 32m to make way for the first space for the original color paint section to move into the first space. After the original color paint section moves, the second space is made way. The second space is equivalent to the length of a mid-coat drying section and a mid-coat section unloading passage to the mid-coat polishing area, as well as an upward passage from the polishing area to the color paint inlet area. The air duct of the original clear coat can be extended to connect to the air duct at the original color paint inlet end, and the air duct of the original color paint can be normally connected to the original clear coat inlet air duct.

[0062] Because the integrated rear-end ducting and flooring can be integrated with the existing rear-end structure, construction costs and time can be significantly reduced. The drying oven was divided into two sections: a relocation section and a retention section. The relocation section was moved downstream of the midcoat section using the aforementioned method to serve as the midcoat drying section. The retention section underwent floor welding, and the water mist and air ducts were extended before being connected to the chamber body. A previously dismantled maintenance platform was rebuilt, and the conveyor chain rails were extended and installed using discarded chain tracks. The water and air lines were restored to complete the transfer.

[0063] At the same time, a catenary conveyor system for loading and unloading vehicles was added to the rear end of the existing midcoat system. Connecting the upper and lower conveyor chains to the polishing area of the original second line of the plant, the overall B1B2 structure was transformed into a 3C2B system, resulting in a complete 3C2B structure: midcoat → midcoat drying → midcoat polishing → basecoat → basecoat drying → clearcoat → oven drying → final assembly. This allows for the fastest possible conversion and minimizes investment. The entire process took 10 days (utilizing only the 10-day Spring Festival holiday, with the line resuming operations after the holiday). The only new equipment added was the catenary conveyor system; the rest was reused equipment.

[0064] The above embodiment forms a complete 3C2B process modification solution through the collaborative design of equipment reuse (such as the division of drying furnaces and conversion of paint line functions), space reconstruction (such as the division of the first and second spaces), safety protection (such as gas detection, grounding copper pipes, and ion cutting) and modular construction (such as segmented copper pipe supports and shared polishing area tracks for upstream and downstream conveyor chains).

[0065] Each step not only independently solves specific technical problems (such as cost, safety, and efficiency), but also constructs an overall optimization path through logical associations (such as the reuse of air ducts after the oven is moved), ultimately achieving a low-cost, short-cycle, and high-safety upgrade of the paint shop.

[0066] In some alternative embodiments: See Figure 1 and Figure 2As shown, an embodiment of the present application provides a method for modifying a B1B2 device into a 3C2B device. The roller of the method for modifying a B1B2 device into a 3C2B device is a hard copper tube. The hard copper tube is used to ground the varnish drying furnace 41 as a whole to eliminate the static electricity accumulation caused by friction or mechanical operation during the movement of the varnish drying furnace 41, and prevent the risk of sparks and explosions caused by static electricity discharge.

[0067] The embodiment of the present application uses the excellent conductivity of the hard copper tube to ground the varnish drying furnace 41 as a whole, which can actively eliminate the risk of static electricity during the movement of the drying furnace and prevent the risk of sparks and explosions caused by static electricity discharge.

[0068] Specifically, multiple hard copper tubes can evenly distribute pressure, stably supporting the varnish drying oven 41 and ensuring a stable electrical connection between the hard copper tubes and the varnish drying oven 41. Furthermore, the hard copper tubes are grounded, forming a grounding loop to conduct static electricity, significantly reducing the risk of explosion and ensuring construction safety.

[0069] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a modification method for converting a B1B2 device into a 3C2B device. Before disconnecting the varnish drying furnace 41 of the drying line 4 from the external water mist pipe, air duct, air pipe, conveyor chain and ground welding points, a detection instrument is used to detect the gas concentration inside the varnish drying furnace 41. If the concentration is higher than the safety threshold, the fresh air system is turned on for ventilation until the concentration is qualified and the disconnection operation is started; Ion cutting technology is used to cut off the connection points between the varnish drying furnace 41 and the outside, and fire-proof cloth is set at the fire point for isolation. At the same time, construction workers wear anti-static equipment and use explosion-proof tools to eliminate the risk of static sparks.

[0070] The embodiment of the present application ensures the safety of hot work operations by combining four-in-one gas detection with ion cutting technology.

[0071] Specifically, before disconnecting the varnish drying furnace 41 from the outside, the construction personnel use a four-in-one detection instrument (detection items include oxygen, combustible gas, toxic gas and hydrogen sulfide) to confirm that the gas concentration inside the oven meets the safety threshold (for example, methane concentration <1000ppm).

[0072] If the concentration exceeds the standard, the fresh air system is immediately activated for forced ventilation until the test passes. Subsequently, ion cutting technology (not traditional flame cutting) is used to precisely disconnect the welds, and fire-resistant cloth (high temperature resistance ≥ 500°C) is laid to isolate the hot spots. Construction workers also wear anti-static equipment (such as anti-static clothing and gloves) and use copper explosion-proof tools.

[0073] This method eliminates explosion hazards caused by flammable gas accumulation and static sparks through full process control of detection-ventilation-explosion-proof cutting-isolation, while shortening the construction period (for example, it can reduce delays caused by safety waiting time).

[0074] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0075] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0076] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A method for converting a B1B2 device into a 3C2B device, characterized in that: The following steps are involved: The drying line (4) downstream of the original varnish line (3) is moved forward as a whole to a set position, so that a first space for arranging a new varnish line (7) is formed between the original varnish line (3) and the drying line (4); The primary color paint line (2) is moved from upstream of the original varnish line (3) to the first space, and a second space for adding a mid-coat drying and polishing line (5) is formed between the mid-coat line (1) and the original varnish line (3); Interchanging the spraying devices of the original varnish line (3) and the original color paint line (2), transforming the original color paint line (2) into the new varnish line (7), and at the same time transforming the original varnish line (3) into the new color paint line (6); A mid-coat drying furnace (51) and a mid-coat polishing line (52) are sequentially arranged in the second space. The mid-coat drying furnace (51) is located upstream of the mid-coat polishing line (52), and the two together form the mid-coat drying and polishing line (5).

2. The method for converting a B1B2 device into a 3C2B device according to claim 1, characterized in that: A mid-coat drying furnace (51) and a mid-coat polishing line (52) are sequentially arranged in the second space, wherein the mid-coat drying furnace (51) is located upstream of the mid-coat polishing line (52), and the two together form a mid-coat drying and polishing line (5), which includes the following steps: Dividing the varnish drying furnace (41) of the drying line (4) into two sections, and moving one of the sections into the second space to form a mid-coat drying furnace (51); A mid-coat polishing line (52) is added in the second space, and the mid-coat drying furnace (51) is located upstream of the mid-coat polishing line (52), and the two together form a mid-coat drying and polishing line (5).

3. The method for converting a B1B2 device into a 3C2B device according to claim 2, characterized in that: A mid-coat drying furnace (51) and a mid-coat polishing line (52) are sequentially arranged in the second space, wherein the mid-coat drying furnace (51) is located upstream of the mid-coat polishing line (52), and the two together form a mid-coat drying and polishing line (5), further comprising the following steps: The middle coating polishing line (52) is sunken and set so that the middle coating polishing line (52) is lower than the middle coating line (1) and the new color paint line (6) in the vertical direction; A downward conveying chain (53) and an upward conveying chain (54) are respectively provided at both ends of the mid-coat polishing line (52) to connect the mid-coat drying furnace (51) and the new color paint line (6).

4. The method for converting a B1B2 device into a 3C2B device according to claim 1, characterized in that: The intermediate coating line (1) comprises an intermediate coating spraying room (11) and an intermediate coating drying room (12) connected to the intermediate coating spraying room (11), the intermediate coating spraying room (11) is connected to a intermediate coating air duct (111), and the intermediate coating drying room (12) is connected to a intermediate coating drying air duct (121); The intermediate coating drying furnace (51) is connected to the intermediate coating drying room (12), and the intermediate coating drying furnace (51) is in communication with the intermediate coating drying air duct (121).

5. The method for converting a B1B2 device into a 3C2B device according to claim 1, characterized in that: The primary color paint line (2) comprises a primary color paint spraying room (21) and a primary color paint drying room (22) connected to the primary color paint spraying room (21), the primary color paint spraying room (21) is connected to a primary color paint air duct (211), and the primary color paint drying room (22) is connected to a primary color paint drying air duct (221); After the original varnish line (3) is transformed into a new color paint line (6), the new color paint spraying room (61) and the new color paint drying room (62) of the new color paint line (6) are connected to the original color paint air duct (211) and the original color paint drying air duct (221) respectively.

6. The method for converting a B1B2 device into a 3C2B device according to claim 1, characterized in that: The original varnish line (3) comprises an original varnish spraying room (31) and an original varnish drying room (32) connected to the original varnish spraying room (31), the original varnish spraying room (31) is connected to an original varnish air duct (311), and the original varnish drying room (32) is connected to an original varnish drying air duct (321); After the primary color paint line (2) is migrated and transformed into a new varnish line (7), the new varnish spraying room (71) and the new varnish drying room (72) of the new varnish line (7) are connected to the original varnish air duct (311) and the original varnish drying air duct (321), respectively.

7. The method for converting a B1B2 device into a 3C2B device according to claim 1, characterized in that: The drying line (4) downstream of the original varnish line (3) is moved forward as a whole to a set position, including the following steps: Disconnect the varnish drying oven (41) of the drying line (4) from the external water mist pipe, air duct, air pipe, conveyor chain and ground welding points, and ensure the accuracy of subsequent restoration of the connection by marking the interface; Arranging a temporary support device at the bottom of the varnish drying furnace (41) to lift the varnish drying furnace (41) off the ground as a whole; Rollers are arranged at intervals along the moving path at the bottom of the varnish drying furnace (41) to serve as a moving support structure; The varnish drying oven (41) is pulled by a hoisting device so that it is moved forward to a set position under the support of a roller bar; After the translation is completed, remove the copper pipe and reconnect the water mist pipe, air duct, gas pipe, conveyor chain and ground welding points, and verify the sealing and functionality of the interface.

8. The method for converting a B1B2 device into a 3C2B device according to claim 7, characterized in that: The roller is a hard copper tube, and the hard copper tube is used to ground the varnish drying furnace (41) as a whole, so as to eliminate the accumulation of static electricity generated by friction or mechanical operation during the movement of the varnish drying furnace (41), and prevent the risk of sparks and explosions caused by static discharge.

9. The method for converting a B1B2 device into a 3C2B device according to claim 7, characterized in that: Before disconnecting the varnish drying furnace (41) of the drying line (4) from the external water mist pipe, air duct, gas pipe, conveyor chain and ground welding point, use a detection instrument to detect the gas concentration inside the varnish drying furnace (41). If the concentration is higher than the safety threshold, start the fresh air system for ventilation until the concentration is qualified and then start the disconnection operation.

10. The method for converting a B1B2 device into a 3C2B device according to claim 7, characterized in that: Ion cutting technology is used to cut off the connection points between the varnish drying furnace (41) and the outside, and fireproof cloth is set at the ignition point for isolation. At the same time, construction workers wear anti-static equipment and use explosion-proof tools to operate to eliminate the risk of static sparks.

Images