PCB high-temperature tin melting tank with self-cleaning function and waste gas negative pressure collecting system

Abstract

The invention discloses a PCB high-temperature tin melting tank with a self-cleaning function and a waste gas negative pressure collecting system, and relates to the technical field of soldering tin recovery. The tin melting tank comprises a tin melting furnace, a tin melting tank body is arranged at the top of the tin melting furnace, and a sealing cover is arranged at the top of the tin melting tank body; a cleaning mechanism is arranged at the bottom of the sealing cover and comprises a rotary drum movably connected to the inner wall of the sealing cover through a bearing seat and a machine box fixedly communicated with the bottom of the rotary drum. Continuous shoveling and conveying of tin slag on the side wall of the tin melting tank are achieved through the compound motion that the rotating cylinder drives the material scraping cylinder to revolve and the conveying roller to rotate, the feeding groove and the material guiding pipe arranged in the material scraping cylinder are combined with negative pressure adsorption to achieve automatic recovery of the tin slag, the tin slag can be directly guided into a collecting box, the cleaning efficiency is improved, and the labor intensity of workers is reduced. By means of the folding storage design (the working state of the scraping barrel is adjusted through a bolt rod), the scraping barrel is prevented from making contact with tin liquid in the non-working state, the service life of equipment is prolonged, and a continuous deslagging channel is formed by the conveying rollers and the guide pipe.

Description

Technical Field

[0001] This invention belongs to the field of solder recycling technology, and in particular relates to a high-temperature PCB solder melting bath with self-cleaning function and a negative pressure waste gas collection system. Background Technology

[0002] In the field of solder recycling technology, solder melting is a crucial step in the recycling of tin resources. Typically, during the solder melting process, dross accumulates on the inner wall of the melting bath as the molten solder cools and solidifies. Simultaneously, the evaporation of molten solder at high temperatures generates tin-containing fumes. Effectively recovering tin resources from the dross and purifying the fumes is of great significance for reducing production costs and minimizing environmental pollution.

[0003] However, existing technologies for solder recycling still face the following pressing problems: First, cleaning slag from the inner wall of the molten solder bath relies heavily on manual, periodic shutdowns, requiring manual scraping with tools. This is not only inefficient but also increases operational risks due to the high-temperature working environment. Furthermore, slag is easily splashed and lost during manual cleaning, resulting in resource waste. Second, direct emission of waste gases generated from molten solder (including slag fumes and volatile organic compounds) not only pollutes the working environment but may also lead to slag resource loss. Existing waste gas collection devices mostly use a single filter layer, which is insufficient for adsorbing micron-sized slag particles and organic pollutants, making efficient purification difficult. Third, traditional cleaning mechanisms are mostly fixed structures, prone to aging and deformation from long-term exposure to high temperatures, shortening equipment lifespan. Moreover, direct contact with high-temperature molten solder during cleaning can lead to equipment corrosion or jamming, affecting the continuity of normal operations.

[0004] To address these issues, we offer a high-temperature PCB solder melting bath with self-cleaning function and a negative pressure exhaust gas collection system. Summary of the Invention

[0005] The purpose of this invention is to provide a PCB high-temperature solder melting bath and exhaust gas negative pressure collection system with self-cleaning function. By cooperating with the cleaning mechanism and the exhaust gas collection mechanism, the invention solves the problems of existing PCB high-temperature solder melting baths and exhaust gas negative pressure collection systems, which lack self-cleaning function and have poor exhaust gas treatment effect.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution.

[0007] This invention relates to a high-temperature solder melting bath for PCBs with self-cleaning function and a negative pressure exhaust gas collection system. It includes a solder melting furnace, a solder melting bath body on top of the furnace, and a sealing cover on top of the bath body. A cleaning mechanism is located at the bottom of the sealing cover. This cleaning mechanism includes a rotating cylinder movably connected to the inner wall of the sealing cover via a bearing seat, a chassis fixedly connected to the bottom of the rotating cylinder, a mounting plate fixedly connected to one side of the chassis, a rotating shaft movably connected to the inner wall of the mounting plate via a bearing seat, and a scraper cylinder fixedly connected to one end of the rotating shaft. An exhaust gas collection mechanism is located at the top of the sealing cover. This mechanism includes a negative pressure fan fixedly connected to the top of the sealing cover, an air inlet pipe connected to the air inlet of the negative pressure fan, a collection box connected to the other end of the air inlet pipe, a suction pipe connected to one side of the collection box, an outlet pipe connected to the air outlet of the negative pressure fan, and a filter cartridge connected to the surface of the outlet pipe.

[0008] The present invention is further configured such that a drive motor is fixedly connected to the top of the sealing cover, a first bevel gear is fixedly connected to the output shaft of the drive motor, a second bevel gear meshes with the surface of the first bevel gear, and the shaft of the second bevel gear is fixedly connected to the surface of the rotating drum. The drive motor transmits power to the rotating drum through a right-angle transmission formed by the first bevel gear and the second bevel gear, thereby achieving physical isolation between the drive motor and the high-temperature zone and extending its service life.

[0009] The invention is further configured such that a threaded hole is provided at the top of the rotating drum, and a bolt rod is threadedly connected to the inner cavity of the threaded hole. A ball is fixedly connected to the bottom of the bolt rod. The bolt rod and the ball form a flipping drive mechanism. When the bolt rod is rotated in the forward direction, the bolt rod drives the drive rod to move laterally through the ball and the drive block. The drive rod drives the rotating shaft to rotate through the toothed plate and the first gear. The rotating shaft drives the scraper cylinder to rotate 90 degrees, so that the scraper cylinder is in the working position.

[0010] The invention is further configured such that a spring is fixedly connected to the inner cavity of the chassis, a driving block is fixedly connected to the other end of the spring, a driving rod is fixedly connected to one side of the driving block, and a toothed plate is fixedly connected to the other end of the driving rod. A first gear meshes with the surface of the toothed plate, and the shaft of the first gear is fixedly connected to the surface of the rotating shaft. The spring provides a restoring force to the driving block. When the bolt rod rotates in the opposite direction, the bolt rod moves upward under the action of the threaded hole. At this time, the spring drives the driving block to move, and the driving block drives the first gear to rotate through the toothed plate, thereby resetting the scraper cylinder.

[0011] The invention is further configured such that a constraint sleeve is fixedly connected to one side of the mounting plate, and the inner side of the constraint sleeve is slidably connected to the surface of the drive rod. The constraint sleeve guides the linear movement of the drive rod and prevents the toothed plate from disengaging from the first gear. The folding design of the cleaning mechanism can avoid the cleaning mechanism from affecting the molten solder inside the solder bath.

[0012] The invention is further configured such that a conveying roller is movably connected to the inner wall of the scraper cylinder via a bearing seat, one end of the conveying roller extends through to one side of the scraper cylinder and is fixedly connected to a second gear, a guide pipe is connected to the surface of the scraper cylinder, a scraper block is provided on the surface of the scraper cylinder, and a feed groove is opened on the surface of the scraper cylinder. When the scraper cylinder is in the working position, the scraper block contacts the inner wall of the molten solder bath. During the rotation of the scraper cylinder, the scraper block removes the tin dross from the inner wall of the molten solder bath. The removed tin dross enters the scraper cylinder through the feed groove and is then conveyed to the surface of the conveyor belt through the conveying roller and the guide pipe.

[0013] The invention is further configured such that a baffle is fixedly connected to one side of the chassis, and a drive shaft is movably connected to one side of the baffle via a bearing seat. A third gear is fixedly connected to one end of the drive shaft, and a toothed ring is fixedly connected to the bottom of the sealing cover. The third gear meshes with the toothed ring. The conveying roller inside the scraper cylinder meshes with the toothed ring via the second and third gears. The rotating drum drives the scraper cylinder to revolve via the mounting plate. At the same time, since the third gear and the toothed ring mesh with each other, and the second gear and the third gear mesh with each other, the second gear drives the conveying roller to rotate.

[0014] The invention is further configured such that a third bevel gear is fixedly connected to the other end of the drive shaft, a fourth bevel gear meshes with the surface of the third bevel gear, a first synchronous pulley is fixedly connected to the shaft of the fourth bevel gear, and a second synchronous pulley is connected to the surface of the first synchronous pulley via a conveyor belt. During the rotation of the third gear, the drive shaft drives the third bevel gear, and the power is transmitted to the conveyor roller via the fourth bevel gear. During the rotation of the conveyor roller, it works with the conveyor belt to transport the solder dross to the inner cavity of the machine, thereby achieving a self-cleaning function, reducing the workload and time of manual cleaning, and improving production efficiency.

[0015] The invention is further configured such that the other end of the suction pipe is connected to the top of the rotating drum via a movable joint, and a through hole is provided at the bottom of the chassis. Both the through hole and the inner cavity of the suction pipe are provided with an intercepting mesh. The intercepting mesh in the inner cavity of the through hole prevents the solder dross from falling through the scraper, and the intercepting mesh in the inner cavity of the suction pipe intercepts the solder dross, causing it to fall into the collection box under gravity for easy collection.

[0016] The invention is further configured such that a collection box is slidably connected to the inner cavity of the collection box, and a filter screen is provided in the inner cavity of the filter cylinder. The number of filter screens is three. When the negative pressure fan is started, the waste gas in the molten solder bath and the solder dross in the inner cavity of the chassis are drawn into the collection box through the suction pipe and the through hole. The solder dross is stored in the collection box. The gas flows through the air inlet pipe and is discharged from the air outlet pipe. Before being discharged, the waste gas is filtered through the three filter screens in the inner cavity of the filter cylinder, namely a metal filter screen (intercepting large particles), an activated carbon layer (adsorbing organic matter), and a HEPA filter element (filtering micron-sized particles). Finally, the clean air is discharged from the air outlet pipe.

[0017] The present invention has the following beneficial effects.

[0018] 1. This invention achieves continuous removal and conveying of tin dross from the side wall of the molten tin bath through the combined motion of the rotating drum driving the scraper's revolution and the conveying roller's rotation. The scraper's built-in feed trough and guide pipe, combined with negative pressure adsorption, enable automatic tin dross recovery, allowing the tin dross to be directly guided into the collection box, improving cleaning efficiency. The foldable storage design (adjusting the scraper's working state via bolt rods) avoids contact with molten tin when not in operation, extending equipment life. The conveying roller and guide pipe form a continuous dross discharge channel.

[0019] 2. The exhaust gas collection mechanism of this invention adopts a three-stage filtration system: a metal filter screen intercepts large particles, activated carbon adsorbs organic matter, and a HEPA filter element filters micron-sized particles. Combined with the dynamic suction of a negative pressure fan, it improves the tin fume collection rate. The filter cartridge and collection box are designed to be separated to avoid secondary pollution. At the same time, the negative pressure fan simultaneously sucks up tin dross, realizing the integration of exhaust gas treatment and tin dross recycling.

[0020] 3. This invention controls the scraper cylinder to rotate 90 degrees through a bolt rod and spring linkage mechanism. The working position unfolds to scrape slag, while the non-working position is vertically stored on the side of the machine. The drive motor is connected to the rotating cylinder through a bevel gear set, realizing physical isolation between the high-temperature zone and the drive components, extending the equipment life. Combined with the sealed structure of the sealing cover, it reduces the temperature fluctuation inside the molten solder bath.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0023] Figure 1 This is a 3D view of a PCB high-temperature solder melting bath with self-cleaning function and a negative pressure waste gas collection system.

[0024] Figure 2 An exploded view of a PCB high-temperature solder melting bath with self-cleaning function and a negative pressure waste gas collection system.

[0025] Figure 3 This is a top view of the sealing cover in a PCB high-temperature solder melting bath and exhaust gas negative pressure collection system with self-cleaning function.

[0026] Figure 4 This is a bottom view of the sealing cover in a PCB high-temperature solder melting bath and exhaust gas negative pressure collection system with self-cleaning function.

[0027] Figure 5 This is a diagram showing the storage status of the scraper cylinder in a high-temperature solder melting bath and exhaust gas negative pressure collection system for PCBs with self-cleaning function.

[0028] Figure 6 This is a diagram showing the usage status of the scraper cylinder in a high-temperature solder melting bath and exhaust gas negative pressure collection system for PCBs with self-cleaning function.

[0029] Figure 7 This is a cross-sectional view of the chassis of a PCB high-temperature solder melting bath and exhaust gas negative pressure collection system with self-cleaning function.

[0030] Figure 8 This is a diagram showing the fit between the third and fourth bevel gears in a high-temperature solder melting bath and exhaust gas negative pressure collection system for PCBs with self-cleaning function.

[0031] Figure 9 This is a cross-sectional view of the scraper cylinder in a high-temperature solder melting bath and exhaust gas negative pressure collection system for PCBs with self-cleaning function.

[0032] In the attached diagram: 1. Solder melting furnace; 2. Solder melting tank body; 3. Sealing cover; 4. Rotary drum; 5. Chassis; 6. Mounting plate; 7. Rotary shaft; 8. Scraper drum; 9. Negative pressure fan; 10. Air inlet pipe; 11. Collection box; 12. Suction pipe; 13. Air outlet pipe; 14. Filter cartridge; 15. Drive motor; 16. First bevel gear; 17. Second bevel gear; 18. Bolt rod; 19. Ball bearing; 20. Spring; 21. Drive block; 2 2. Drive rod; 23. Toothed plate; 24. First gear; 25. Constraint sleeve; 26. Conveyor roller; 27. Second gear; 28. Guide tube; 29. ​​Scraper; 30. Feed chute; 31. Baffle; 32. Drive shaft; 33. Third gear; 34. Toothed ring; 35. Third bevel gear; 36. Fourth bevel gear; 37. First synchronous pulley; 38. Second synchronous pulley; 39. Through hole; 40. Collection box; 41. Filter screen. Detailed Implementation

[0033] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Example 1

[0035] Please see Figures 1-9This invention relates to a high-temperature PCB solder melting bath with self-cleaning function and a negative pressure waste gas collection system. It includes a solder melting furnace 1, a solder melting bath body 2 at the top of the furnace 1, and a sealing cover 3 at the top of the body 2. A cleaning mechanism is located at the bottom of the sealing cover 3, comprising a rotating cylinder 4 movably connected to the inner wall of the sealing cover 3 via a bearing seat, a chassis 5 fixedly connected to the bottom of the rotating cylinder 4, a mounting plate 6 fixedly connected to one side of the chassis 5, a rotating shaft 7 movably connected to the inner wall of the mounting plate 6 via a bearing seat, and a scraper cylinder 8 fixedly connected to one end of the rotating shaft 7. A drive motor 15 is fixedly connected to the top of the sealing cover 3, and a first bevel gear 16 is fixedly connected to the output shaft of the drive motor 15. A second bevel gear 17 meshes with the surface of the first bevel gear 16, and the axis of the second bevel gear 17 is fixed to the surface of the rotating cylinder 4. The inner wall of the scraper cylinder 8 is movably connected to a conveyor roller 26 via a bearing seat. One end of the conveyor roller 26 extends through to one side of the scraper cylinder 8 and is fixedly connected to a second gear 27. A guide pipe 28 is connected to the surface of the scraper cylinder 8. Scraper blocks 29 are provided on the surface of the scraper cylinder 8. A feed groove 30 is opened on the surface of the scraper cylinder 8. A baffle 31 is fixedly connected to one side of the machine housing 5. A third gear 33 is fixedly connected to one end of the drive shaft 32. A toothed ring 34 is fixedly connected to the bottom of the sealing cover 3. The third gear 33 and the toothed ring 34 mesh with each other. A third bevel gear 35 is fixedly connected to the other end of the drive shaft 32. A fourth bevel gear 36 meshes with the surface of the third bevel gear 35. A first synchronous pulley 37 is fixedly connected to the shaft of the fourth bevel gear 36. A second synchronous pulley 38 is connected to the surface of the first synchronous pulley 37 via a conveyor belt.

[0036] Further supplementary information: The sealing cover 3 seals the solder melting tank body 2, which helps to prevent heat loss and thus reduces the time required for the molten solder to melt inside the solder melting tank body 2. It also facilitates the absorption of waste gas generated during solder processing in a sealed environment, preventing direct emission of fumes into the outside world and avoiding any impact on the operator's health. The drive motor 15 transmits power to the rotating drum 4 through a right-angle transmission formed by the first bevel gear 16 and the second bevel gear 17, achieving physical isolation between the drive motor 15 and the high-temperature zone, extending its service life. The conveying roller 26 inside the scraper drum 8 meshes with the toothed ring 34 through the second gear 27 and the third gear 33. The rotating drum 4 drives the scraper drum 8 to rotate via the mounting plate 6. Simultaneously, due to the meshing of the third gear 33 and the toothed ring 34... The second gear 27 meshes with the third gear 33, so the second gear 27 drives the conveyor roller 26 to rotate. When the scraper cylinder 8 is in the working position, the scraper block 29 contacts the inner wall of the molten solder bath body 2. During the rotation of the scraper cylinder 8, the scraper block 29 removes the tin dross from the inner wall of the molten solder bath body 2. The removed tin dross enters the scraper cylinder 8 through the feed chute 30, and is then conveyed to the surface of the conveyor belt through the conveyor roller 26 and the guide pipe 28. During the rotation of the third gear 33, the third bevel gear 35 is driven through the drive shaft 32, and the power is transmitted to the conveyor roller 26 through the fourth bevel gear 36. During the rotation of the conveyor roller 26, it works with the conveyor belt to transport the tin dross to the inner cavity of the machine housing 5, thereby achieving a self-cleaning function, reducing the workload and time of manual cleaning, and improving production efficiency.

[0037] Example 2

[0038] Please see Figures 1-9 Based on embodiment 1, the top of the rotating drum 4 is provided with a threaded hole, and a bolt rod 18 is threadedly connected to the inner cavity of the threaded hole. A ball bearing 19 is fixedly connected to the bottom of the bolt rod 18. A spring 20 is fixedly connected to the inner cavity of the housing 5. A drive block 21 is fixedly connected to the other end of the spring 20. A drive rod 22 is fixedly connected to one side of the drive block 21. A toothed plate 23 is fixedly connected to the other end of the drive rod 22. A first gear 24 meshes with the surface of the toothed plate 23. The axis of the first gear 24 is fixedly connected to the surface of the rotating shaft 7. A constraint sleeve 25 is fixedly connected to one side of the mounting plate 6. The inner side of the constraint sleeve 25 is slidably connected to the surface of the drive rod 22.

[0039] Further details: Bolt rod 18 and ball bearing 19 form a flipping drive mechanism. When bolt rod 18 rotates forward, it drives drive rod 22 to move laterally via ball bearing 19 and drive block 21. Drive rod 22 drives shaft 7 to rotate via toothed plate 23 and first gear 24. Shaft 7 drives scraper cylinder 8 to rotate 90 degrees, placing scraper cylinder 8 in the working position. Spring 20 provides a restoring force to drive block 21. When bolt rod 18 rotates in the reverse direction, it moves upward under the action of threaded hole. At this time, spring 20 drives drive block 21 to move. Drive block 21 drives first gear 24 to rotate via toothed plate 23, thereby resetting scraper cylinder 8. Constraint sleeve 25 guides the linear motion of drive rod 22, preventing toothed plate 23 from disengaging from first gear 24. The folding design of the cleaning mechanism can avoid the cleaning mechanism affecting the molten solder inside the solder bath body 2.

[0040] Example 3

[0041] Please see Figures 1-9 Based on Embodiments 1 and 2, a waste gas collection mechanism is provided on the top of the sealing cover 3. The waste gas collection mechanism includes a negative pressure fan 9 fixedly connected to the top of the sealing cover 3, an air inlet pipe 10 connected to the air inlet of the negative pressure fan 9, a collection box 11 connected to the other end of the air inlet pipe 10, an air suction pipe 12 connected to one side of the collection box 11, an air outlet pipe 13 connected to the air outlet of the negative pressure fan 9, and a filter cylinder 14 connected to the surface of the air outlet pipe 13. The other end of the air suction pipe 12 is connected to the top of the rotating cylinder 4 through a movable joint. A through hole 39 is provided at the bottom of the casing 5. A collection box 40 is slidably connected to the inner cavity of the collection box 11. A filter screen 41 is provided in the inner cavity of the filter cylinder 14. The number of filter screens 41 is three.

[0042] Further details: Both the through-hole 39 and the inner cavity of the suction pipe 12 are equipped with intercepting nets. The intercepting net in the inner cavity of the through-hole 39 prevents solder dross from falling through, and the intercepting net in the inner cavity of the suction pipe 12 intercepts the solder dross, causing it to fall into the collection box 40 under gravity for easy collection. The negative pressure fan 9 is started, and the exhaust gas in the molten solder bath and the solder dross in the inner cavity of the chassis 5 are drawn into the collection box 11 through the suction pipe 12 and the through-hole 39. The solder dross is stored in the collection box 40. The gas flows through the air inlet pipe 10 and is discharged from the air outlet pipe 13. Before being discharged, the exhaust gas is filtered through three filter screens 41 in the inner cavity of the filter cartridge 14, namely a metal filter screen (intercepting large particles), an activated carbon layer (adsorbing organic matter), and a HEPA filter element (filtering micron-sized particles). Finally, the clean air is discharged from the air outlet pipe 13.

[0043] The working principle of this invention is as follows: turn on the solder melting furnace 1, place a solder block into the inner cavity of the solder melting tank body 2, place the sealing cover 3 on the top of the solder melting tank body 2, and seal the solder melting tank body 2 with the sealing cover 3. This not only prevents heat loss and reduces the time required for the molten solder to melt in the inner cavity of the solder melting tank body 2, but also facilitates the adsorption of waste gas generated during the processing of molten solder in a sealed environment, preventing the fumes from being directly emitted into the outside world and affecting the health of the operator.

[0044] At this time, the negative pressure fan 9 starts, and draws the waste gas in the molten solder bath body 2 into the collection box 11 through the suction pipe 12 and the through hole 39. The gas flows through the air inlet pipe 10 and is discharged from the air outlet pipe 13. Before being discharged, the waste gas is filtered through three filter screens 41 in the inner cavity of the filter cartridge 14, namely a metal filter screen (intercepting large particles), an activated carbon layer (adsorbing organic matter), and a HEPA filter element (filtering micron-sized particles). Finally, the clean air is discharged from the air outlet pipe 13.

[0045] When the inner wall of the molten solder bath body 2 needs to be cleaned after use, rotate the bolt rod 18 in the forward direction. The bolt rod 18 drives the drive rod 22 to move laterally through the ball bearing 19 and the drive block 21. The drive rod 22 drives the rotating shaft 7 to rotate through the toothed plate 23 and the first gear 24. The rotating shaft 7 drives the scraper cylinder 8 to rotate 90 degrees, so that the scraper cylinder 8 is in the working position. At this time, the scraper block 29 is in contact with the inner wall of the molten solder bath body 2.

[0046] Then, the drive motor 15 is started. The drive motor 15 drives the rotating drum 4 to rotate through the first bevel gear 16 and the second bevel gear 17, realizing the physical isolation of the drive motor 15 from the high-temperature zone and extending its service life. The rotating drum 4 drives the scraper drum 8 to revolve through the mounting plate 6. At the same time, since the third gear 33 and the toothed ring 34 mesh with each other, and the second gear 27 meshes with the third gear 33, the second gear 27 drives the conveying roller 26 to rotate. During the revolution of the scraper drum 8, the scraper block 29 removes the tin dross from the inner wall of the molten tin tank body 2. The removed tin dross enters the scraper drum 8 through the feed chute 30 and is conveyed... The feeding roller 26 lifts the tin dross and then conveys it to the surface of the conveyor belt through the guide pipe 28. During the rotation of the third gear 33, the third bevel gear 35 is driven by the drive shaft 32, and the power is transmitted to the conveying roller 26 through the fourth bevel gear 36. During the rotation of the conveying roller 26, it works with the conveyor belt to transport the tin dross into the inner cavity of the machine housing 5. Under the action of the negative pressure fan 9, the tin dross enters the inner cavity of the collection box 11 through the suction pipe 12. The interception net in the inner cavity of the suction pipe 12 intercepts the tin dross and stores it in the collection box 40, thereby realizing the self-cleaning function, reducing the workload and time of manual cleaning, and improving production efficiency.

[0047] After use, rotate the bolt rod 18 in the opposite direction. Under the action of the threaded hole, the bolt rod 18 moves upward. At this time, the spring 20 drives the drive block 21 to move. The drive block 21 drives the first gear 24 to rotate through the toothed plate 23, thereby resetting the scraper cylinder 8. The constraint sleeve 25 guides the linear motion of the drive rod 22 to prevent the toothed plate 23 from disengaging from the first gear 24. The folding design of the cleaning mechanism can avoid the cleaning mechanism from affecting the molten solder inside the solder bath body 2.

[0048] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A PCB high-temperature solder melting bath and exhaust gas negative pressure collection system with self-cleaning function, including a solder melting furnace (1), characterized in that: The tin melting furnace (1) is provided with a tin melting tank body (2) on the top, and a sealing cover (3) is provided on the top of the tin melting tank body (2); The bottom of the sealing cover (3) is provided with a cleaning mechanism, which includes a rotating cylinder (4) movably connected to the inner wall of the sealing cover (3) through a bearing seat, a chassis (5) fixedly connected to the bottom of the rotating cylinder (4), a mounting plate (6) fixedly connected to one side of the chassis (5), a rotating shaft (7) movably connected to the inner wall of the mounting plate (6) through a bearing seat, and a scraper cylinder (8) fixedly connected to one end of the rotating shaft (7). The top of the sealing cover (3) is provided with a waste gas collection mechanism, which includes a negative pressure fan (9) fixedly connected to the top of the sealing cover (3), an air inlet pipe (10) connected to the air inlet of the negative pressure fan (9), a collection box (11) connected to the other end of the air inlet pipe (10), an air suction pipe (12) connected to one side of the collection box (11), an air outlet pipe (13) connected to the air outlet of the negative pressure fan (9), and a filter cylinder (14) connected to the surface of the air outlet pipe (13).

2. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 1, characterized in that: The top of the sealing cover (3) is fixedly connected to a drive motor (15), the output shaft of the drive motor (15) is fixedly connected to a first bevel gear (16), the surface of the first bevel gear (16) is meshed with a second bevel gear (17), and the shaft of the second bevel gear (17) is fixedly connected to the surface of the rotating drum (4).

3. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 1, characterized in that: The top of the rotating drum (4) is provided with a threaded hole, and a bolt rod (18) is threadedly connected to the inner cavity of the threaded hole. A ball bearing (19) is fixedly connected to the bottom of the bolt rod (18).

4. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 1, characterized in that: A spring (20) is fixedly connected to the inner cavity of the chassis (5). A drive block (21) is fixedly connected to the other end of the spring (20). A drive rod (22) is fixedly connected to one side of the drive block (21). A toothed plate (23) is fixedly connected to the other end of the drive rod (22). A first gear (24) meshes with the surface of the toothed plate (23). The axis of the first gear (24) is fixedly connected to the surface of the rotating shaft (7).

5. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 4, characterized in that: A constraint sleeve (25) is fixedly connected to one side of the mounting plate (6), and the inner side of the constraint sleeve (25) is slidably connected to the surface of the drive rod (22).

6. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 1, characterized in that: The inner wall of the scraper cylinder (8) is movably connected to a conveying roller (26) via a bearing seat. One end of the conveying roller (26) extends through to one side of the scraper cylinder (8) and is fixedly connected to a second gear (27). A guide pipe (28) is connected to the surface of the scraper cylinder (8). A scraper block (29) is provided on the surface of the scraper cylinder (8). A feed groove (30) is opened on the surface of the scraper cylinder (8).

7. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 1, characterized in that: A baffle (31) is fixedly connected to one side of the chassis (5). A drive shaft (32) is movably connected to one side of the baffle (31) through a bearing seat. A third gear (33) is fixedly connected to one end of the drive shaft (32). A toothed ring (34) is fixedly connected to the bottom of the sealing cover (3). The third gear (33) and the toothed ring (34) mesh with each other.

8. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 7, characterized in that: The other end of the drive shaft (32) is fixedly connected to a third bevel gear (35), and a fourth bevel gear (36) meshes with the surface of the third bevel gear (35). A first synchronous pulley (37) is fixedly connected to the shaft center of the fourth bevel gear (36), and a second synchronous pulley (38) is connected to the surface of the first synchronous pulley (37) via a conveyor belt.

9. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 1, characterized in that: The other end of the suction pipe (12) is connected to the top of the rotating drum (4) through a movable joint, and a through hole (39) is provided at the bottom of the housing (5).

10. The PCB high-temperature solder melting bath and waste gas negative pressure collection system with self-cleaning function according to claim 1, characterized in that: The inner cavity of the collection box (11) is slidably connected to a collection box (40), and the inner cavity of the filter cylinder (14) is provided with a filter screen (41), and the number of the filter screens (41) is three.

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