Powder metallurgy mesh belt type sintering furnace

Abstract

The utility model discloses a powder metallurgy mesh belt type sintering furnace which comprises a mesh belt conveyor, a sintering furnace body, a front conveying box and a rear conveying box. The sintering furnace body, the front conveying box and the rear conveying box are sequentially communicated with one another in the workpiece conveying direction. The upper layer of a mesh belt of the mesh belt conveyor is arranged in the sintering furnace, the front conveying box and the rear conveying box in a penetrating mode and provided with a plurality of limiting seats, push rods are erected on the two sides of each limiting seat, the rear section, away from the sintering furnace, of the front conveying box is obliquely and downwards arranged in the direction close to the rear conveying box, and mesh belt supporting rollers are rotationally connected into the two ends of the rear section of the front conveying box. The front conveying box is fixedly sleeved with a cooling box, and the middle of the rear conveying box is connected with a dustproof box internally provided with a metal fiber cloth curtain. A baffle with the top hinged to the top of the outlet end of the rear conveying box is arranged at the outlet end of the rear conveying box, a compression spring is connected between the outlet end of the rear conveying box and the baffle, and an automatic cleaning mechanism is erected outside the outlet end of the rear conveying box. And the overall sintering quality is good, the protective atmosphere overflow is reduced, the mesh belt is automatically cleaned, and the advantages of good sintering cooling effect, low cost and convenience in cleaning are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mesh belt sintering furnaces, and more specifically, it relates to a powder metallurgy mesh belt sintering furnace. Background Art

[0002] The powder metallurgy mesh belt sintering furnace is a continuous operation sintering production line, which is mainly used for high-temperature sintering treatment of formed metal powder blank workpieces. The existing powder metallurgy mesh belt sintering furnace generally uses a mesh belt conveying device to convey the workpieces to the sintering section and the cooling section in the furnace successively. Under the condition that a protective atmosphere (hydrogen and nitrogen) is filled into the furnace through the air inlet between the two sections, ideal continuous sintering and cooling process flows are carried out on the workpieces successively; however, because the cooling section of the above sintering furnace is a straight-through similar square tube type setting, and there is also a lack of a blocking device at the rear end outlet of the cooling section, a convection will be formed between the air in the furnace and the outside air, which is extremely easy to cause a large amount of air to enter the cooling section and part of the protective atmosphere to overflow from the outlet of the cooling section to the outside of the furnace, resulting in unstable protective atmosphere in the furnace, thus causing surface oxidation or scrapping of the workpieces, increasing the use cost of the protective atmosphere, and having problems of poor sintering effect and high sintering cost; in addition, during sintering, impurities such as powder, dust, slag chips or iron filings will adhere to the conveyor mesh belt. Since the above powder metallurgy mesh belt sintering furnace has no automatic cleaning structure, it is not convenient to clean the conveyor mesh belt in time. If not cleaned in time for a long time, impurities on the mesh belt will accumulate and cause the mesh belt holes to be blocked, thus affecting the sintering effect and the heat dissipation and cooling effect below the workpiece, and further affecting the sintering quality of the workpiece. Overall, there are problems of poor sintering and cooling effects, high costs and inconvenient cleaning. Summary of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a powder metallurgy mesh belt sintering furnace, which solves the problem of affecting the sintering quality of workpieces due to oxidation during workpiece sintering and accumulation of impurities on the conveyor mesh belt, reduces the overflow of the protective atmosphere, and reduces the use cost of the protective atmosphere. At the same time, it avoids mesh belt blockage, and has the advantages of good sintering and cooling effects, low cost and convenient automatic cleaning.

[0004] To achieve the above purpose, the present utility model provides the following technical solutions:

[0005] A powder metallurgy mesh belt sintering furnace, comprising a mesh belt conveyor, a sintering furnace, a front conveying box and a rear conveying box which are sequentially connected to each other along the workpiece conveying direction, the mesh belt upper layer of the mesh belt conveyor is arranged in the sintering furnace, the front conveying box and the rear conveying box, the rear section of the front conveying box away from the sintering furnace is inclined downwardly arranged toward the rear conveying box, both ends of the rear section of the front conveying box are rotatably connected with mesh belt support rollers, the outer fixed sleeve of the front conveying box is provided with a cooling box with circulating cooling water, the middle of the rear conveying box is connected with A dustproof box, in which a metal fiber curtain for blocking air is installed, a baffle is provided at the outlet end of the rear conveying box, the top of the baffle is hinged to the top of the outlet end of the rear conveying box, a plurality of limit seats are installed on the mesh belt of the mesh belt conveyor to prevent the workpiece from moving, push rods are mounted on both sides of the limit seat, which are located above the workpiece and push the baffle to flip out of the rear conveying box, a compression spring is connected between the outlet end of the rear conveying box and the baffle, and an automatic cleaning mechanism for cleaning the mesh belt of the mesh belt conveyor is mounted outside the outlet end of the rear conveying box.

[0006] It is further configured that the range of the angle a formed by the front section and the rear section of the front conveying box is [170°, 177°], and the height of the bottom of the front section of the front conveying box relative to the ground is greater than or equal to the height of the top of the rear conveying box relative to the ground.

[0007] It is further provided that: a side edge of the baffle close to the sintering furnace is connected with a silicone foam sealing strip arranged in an inverted U-shape, and three sides of the outlet end of the rear conveying box are provided with limiting grooves for placing the silicone foam sealing strip.

[0008] Further configuration: the automatic cleaning mechanism includes a frame, a scraper and a shaking cylinder respectively installed on the upper end and the middle part of the frame; the scraper is located below the upper layer of the mesh belt of the mesh belt conveyor, and is used to clean the bottom of the upper layer of the mesh belt of the mesh belt conveyor, the top rod of the shaking cylinder is connected to a shaking plate that hits the top of the lower layer of the mesh belt of the mesh belt conveyor, and the lower end of the frame is rotatably connected to a cleaning roller located between the scraper and the shaking cylinder; the cleaning roller is connected along its circumference with several groups of soft bristles for cleaning the bottom of the lower layer of the mesh belt of the mesh belt conveyor, and a clearance channel for the push rod to pass through is formed on both sides of the cleaning roller and between the soft bristles, and the frame is detachably connected with an upper collecting box located below the scraper and a lower collecting box located below the shaking plate and the cleaning roller.

[0009] It is further provided that: a cleaning plate for cleaning the soft bristles is connected to the top of the lower collecting box, and the cleaning plate is provided with a group of through grooves for the soft bristles to rotate through.

[0010] Further setting: A water curtain system is also installed in the rear conveying box and located between the metal fiber cloth curtain and the front conveying box. The water curtain system includes a long water spraying pipe, a water conveying pipe, a circulating water pipe and a water tank. One end of the long water spraying pipe is communicated with the upper end of the water tank through the water conveying pipe. The bottom of the long water spraying pipe is provided with water spraying holes. The top of the rear conveying box is provided with long holes communicated with the water spraying holes. The top of the rear conveying box is connected with a sealing box. The long water spraying pipe is installed in the sealing box. The bottom of the rear conveying box is detachably communicated with a water storage box located below the long water spraying pipe. A filter screen is connected in the water storage box. A first water pump is installed on the circulating water pipe. The bottom of the water storage box is communicated with the lower end of the water tank through the circulating water pipe.

[0011] Further setting: The lower end of the outlet end of the rear conveying box is connected with a lower sealing plate, which is located between the bottom of the upper layer of the mesh belt of the mesh belt conveyor and the bottom of the outlet end of the rear conveying box. A groove is opened on the top of the lower sealing plate on the side far away from the sintering furnace. A sealing roller for supporting the mesh belt of the mesh belt conveyor is rotatably connected in the groove.

[0012] Further setting: The front conveying box includes a slow cooling square pipe, a front square pipe and a rear square pipe that are sequentially communicated with each other along the workpiece conveying direction. Connecting flanges are provided at both ends of the slow cooling square pipe, both ends of the front square pipe, both ends of the rear square pipe and the inlet end of the rear conveying box. The connecting flanges are connected with bolts. The outlet end of the sintering furnace is communicated with one end of the slow cooling square pipe. An air inlet for allowing a protective atmosphere to enter is provided on one side of the slow cooling square pipe. A slow cooling box is fixedly sleeved on the outer peripheral surface of the slow cooling square pipe. One side of the slow cooling box is communicated with a cooling fan through a pipeline; There are two cooling boxes, which are respectively fixedly sleeved on the outer peripheral surfaces of the front square pipe and the rear square pipe, and the cooling boxes are both connected with a cooling mechanism.

[0013] Further setting: The cooling mechanism includes a slow cooling tank and a water storage tank. A water inlet pipe is communicated between one end of the cooling box and one side of the water storage tank. A conveying coil pipe is communicated between one side of the slow cooling tank and the other side of the water storage tank. A second water pump is installed on the conveying coil pipe. An outlet pipe is communicated between the other end of the cooling box and the other side of the slow cooling box. A temperature sensor and a liquid level sensor are arranged in the water storage tank. The temperature sensor is electrically connected with an external control system. The liquid level sensor is electrically connected with the input end of the external control system. A drain port and a water filling port for connecting an external water source are provided on one side of the water storage tank. Solenoid valves are connected to the water filling port and the drain port. A group of cleaning ports are opened on the top of the cooling box. A flip cover is hinged to the cleaning ports. A motor for driving the flip cover to rotate and open is installed on the top of the cooling box. The motor and the solenoid valves are both electrically connected with the output end of the external control system.

[0014] In summary, in the present utility model, the rear section of the front conveying box is set to be inclined downward in the direction close to the rear conveying box, which plays a role in initially blocking the entry of external air into the furnace and preventing the overflow of the protective atmosphere inside the furnace; through the mesh belt support rollers and the limit seats, it avoids the workpieces from colliding with the inner wall of the rear section of the front conveying box and the workpieces in the front and rear groups from rolling or colliding with each other as the mesh belt inclines downward, playing a role in limiting the workpieces and ensuring the conveying efficiency of the workpieces; through the dust-proof box and the metal fiber cloth curtain, it facilitates the passage of the workpieces and further reduces the overflow of the protective atmosphere. At the same time, it secondarily blocks the entry of external air and the overflow of a small amount of protective atmosphere that enters the rear conveying box, playing a role in secondarily blocking the entry of external air into the furnace and the overflow of the protective atmosphere inside the furnace; through the baffle plate, it plays a role in thirdly blocking the entry of external air into the furnace and the overflow of the protective atmosphere inside the furnace; through the push rod and the compression spring, when the workpiece is conveyed to the outlet end of the rear conveying box, while the push rod moves together with the workpiece and the limit seat, it pushes the baffle plate to flip outward from the rear conveying box. Until the workpiece is completely conveyed outside the rear conveying box, the push rod leaves the bottom of the baffle plate. Under the elastic force of the compression spring, the baffle plate seals the outlet end of the rear conveying box again, playing a role in automatically opening and closing the baffle plate; through the automatic cleaning mechanism, it plays a role in automatically cleaning the impurities on the mesh belt of the mesh belt conveyor; through the cooling box, it plays a role in non-contact cooling and temperature reduction of the workpiece.

[0015] The present utility model integrates the functions of multiple times of blocking the entry of external air into the furnace, multiple times of blocking the overflow of the protective atmosphere, and the automatic cleaning function, solves the problem that the sintering quality of the workpiece is affected by the sintering oxidation of the workpiece and the accumulation of impurities on the conveying mesh belt, ensures the stability of the atmosphere inside the furnace, reduces the overflow of the protective atmosphere, reduces the use cost of the protective atmosphere. At the same time, it avoids the influence of mesh belt blockage on the sintering and heat dissipation effects of the workpiece. As a whole, it has the advantages of good sintering and cooling effects, low cost and convenient automatic cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the embodiment of the present utility model;

[0017] Figure 2 is the cross-sectional view of the embodiment of the present utility model;

[0018] Figure 3 is Figure 2 the partial enlarged view of A in

[0019] Figure 4 is Figure 2 the partial enlarged view of B in

[0020] Figure 5 is the partial structural schematic diagram of the embodiment of the present utility model;

[0021] Figure 6 is the partial structural schematic diagram of the automatic cleaning mechanism in the embodiment of the present utility model;

[0022] Figure 7 This is a schematic structural diagram of the cleaning roller and soft bristles in the embodiment of the present utility model;

[0023] Figure 8 This is a schematic structural diagram of the outlet end part of the rear conveying box in the embodiment of the present utility model.

[0024] In the figure: 1. Mesh belt conveyor; 2. Sintering furnace; 3. Slow cooling square pipe; 4. Front pipe; 5. Rear pipe; 6. Rear conveying box; 7. Mesh belt support roller; 8. Cooling box; 9. Dust-proof box; 10. Metal fiber cloth curtain; 11. Baffle; 12. Limit seat; 13. Push rod; 14. Compression spring; 15. Silicone foam sealing strip; 16. Limit groove; 17. Frame; 18. Scraper; 19. Jitter cylinder; 20. Jitter plate; 21. Cleaning roller; 22. Soft bristles; 23. Upper collection box; 24. Lower collection box; 25. Cleaning plate; 26. Through groove; 27. Spraying long pipe; 28. Water delivery pipe; 29. Circulating water pipe; 30. Water tank; 31. Spraying holes; 32. Long holes; 33. Sealing box; 34. Water storage box; 35. Filter screen; 36. Lower sealing plate; 37. Groove; 38. Sealing roller; 39. Connecting flange; 40. Air inlet; 41. Slow cooling box; 42. Cooling fan; 43. Slow cooling tank; 44. Water storage tank; 45. Water inlet pipe; 46. Conveying coil; 47. Water outlet pipe; 48. Temperature sensor; 49. Water filling port; 50. Drainage port; 51. Solenoid valve; 52. Cleaning port; 53. Flap; 54. Motor; 55. Yielding channel. Detailed implementation manners

[0025] To describe in detail the technical content, achieved objectives and effects of the present utility model, the following is described in conjunction with the embodiments and with reference to the accompanying drawings. It should be noted that the terms "upper" and "lower" used in the following description refer to the directions in the Figure 2 drawing, and the terms "bottom end" and "top end" refer to the directions towards the geometric center of the specific component in the Figure 2 drawing.

[0026] The most crucial concept of the present utility model lies in: setting the rear section of the front conveying box to be inclined downward towards the direction of the rear conveying box 6, which serves to initially block the entry of external air into the furnace and prevent the overflow of the protective atmosphere inside the furnace; through the mesh belt support rollers 7 and the limit seats 12, it plays a role in limiting the workpieces and ensuring the conveying efficiency of the workpieces; through the dust-proof box 9 and the metal fiber cloth curtain 10, it plays a role in secondarily blocking the entry of external air into the furnace and preventing the overflow of the protective atmosphere inside the furnace; through the baffle 11, it plays a role in thirdly blocking the entry of external air into the furnace and preventing the overflow of the protective atmosphere inside the furnace; through the push rod 13 and the compression spring 14, when the workpiece is conveyed to the outlet end of the rear conveying box 6, while the push rod 13 moves, it pushes the baffle 11 to flip outwards towards the outside of the rear conveying box 6 until the workpiece and the push rod 13 leave the range of the baffle 11. Under the elastic force of the compression spring 14, the baffle 11 reseals the outlet end of the rear conveying box 6, playing a role in automatically opening and closing the baffle 11; through the automatic cleaning mechanism, it plays a role in automatically cleaning the impurities on the mesh belt of the mesh belt conveyor 1.

[0027] The present utility model integrates the functions of multiple times of blocking the entry of external air into the furnace, multiple times of blocking the overflow of the protective atmosphere, and the automatic cleaning function, ensuring the stability of the atmosphere inside the furnace, solving the problems that the sintering quality of the workpieces is affected by the sintering oxidation of the workpieces and the accumulation of impurities on the conveying mesh belt, reducing the overflow of the protective atmosphere, reducing the usage cost of the protective atmosphere. At the same time, it avoids the influence of mesh belt blockage on the sintering and heat dissipation effects of the workpieces. As a whole, it has the advantages of good sintering and cooling effects, low cost, and being convenient for automatic cleaning.

[0028] Please refer to Figures 1 to 8 As shown in the figure, a powder metallurgy mesh belt type sintering furnace includes a mesh belt conveyor 1, a sintering furnace 2, a front conveying box, and a rear conveying box 6 that are sequentially interconnected along the workpiece conveying direction. The upper layer of the mesh belt of the mesh belt conveyor 1 passes through the sintering furnace 2, the front conveying box, and the rear conveying box 6. The rear section of the front conveying box away from the sintering furnace 2 is inclined downward towards the direction of the rear conveying box 6. Both ends inside the rear section of the front conveying box are rotatably connected with mesh belt support rollers 7. The front conveying box is fixedly sleeved with a cooling box 8 with circulating cooling water inside. The middle of the rear conveying box 6 is connected with a dust-proof box 9, and a metal fiber cloth curtain 10 for blocking air is installed inside the dust-proof box 9. A baffle 11 is provided at the outlet end of the rear conveying box 6. The top of the baffle 11 is hinged to the top of the outlet end of the rear conveying box 6. A plurality of limit seats 12 for preventing the movement of the workpieces are installed on the mesh belt of the mesh belt conveyor 1. Push rods 13 that are located above the workpieces and push the baffle 11 to flip outwards towards the outside of the rear conveying box 6 are installed on both sides of the limit seats 12. A compression spring 14 is connected between the outlet end of the rear conveying box 6 and the baffle 11. An automatic cleaning mechanism for cleaning the mesh belt of the mesh belt conveyor 1 is installed outside the outlet end of the rear conveying box 6.

[0029] As can be seen from the above description, after the formed metal powder blank workpiece is sintered at high temperature in the sintering furnace 2, the mesh belt conveyor 1 continues to convey the sintered workpiece to the front conveying box. The cooling box 8 fixedly sleeved outside the front conveying box plays a role in non-contact cooling and temperature reduction of the workpiece. By setting the rear section of the front conveying box to be inclined downward towards the rear conveying box 6, due to the obstruction of the inner wall of the rear section of the front conveying box, a large amount of protective atmosphere in the front section of the front conveying box and the rear section of the sintering furnace 2 is prevented from overflowing to the outside of the furnace through the outlet end of the rear conveying box 6. At the same time, the outside air is blocked from entering the front section of the front conveying box, playing a role in initially blocking the outside air from entering the furnace and the overflow of the protective atmosphere inside the furnace. The stability of the furnace atmosphere is initially ensured, the sintering quality of the workpiece is prevented from being affected by sintering oxidation of the workpiece. At the same time, the loss of the protective atmosphere is initially reduced, and the use cost of the protective atmosphere is reduced, thus realizing the role of improving the overall sintering effect and reducing the overall sintering cost. When the workpiece is conveyed to the rear section of the front conveying box, through the mesh belt support roller 7 and the limit seat 12, the upper layer of the mesh belt of the mesh belt conveyor 1 located in the rear section of the front conveying box is set to be parallel to the rear section of the front conveying box by using the mesh belt support roller 7, ensuring that the workpiece passes through the rear section of the front conveying box smoothly and quickly. At the same time, by using the limit seat 12, the workpieces in the front and rear groups are separated, preventing the workpieces in the front and rear groups from rolling downward or colliding with each other towards the rear conveying box 6 as the mesh belt inclines, playing a role in limiting the workpiece and ensuring the conveying efficiency of the workpiece.

[0030] Through the dust-proof box 9 and the metal fiber cloth curtain 10, when there is no workpiece passing through, it is used to secondarily block the outside air from entering the rear conveying box 6 and secondarily block the overflow of a small amount of protective atmosphere entering the rear conveying box 6 through the inclined rear section of the front conveying box. When the workpiece is conveyed to the metal fiber cloth curtain 10 in the front conveying box, while facilitating the passage of the workpiece, the overflow of the protective atmosphere to the outlet end of the rear conveying box 6 is further reduced, playing a role in secondarily blocking the outside air from entering the furnace and the overflow of the protective atmosphere inside the furnace. Further avoiding the oxidation of the workpiece, further reducing the energy loss of the protective atmosphere, reducing the use cost of the protective atmosphere, and realizing the role of further improving the overall sintering effect and reducing the overall sintering use cost.

[0031] Through the baffle 11, when no workpiece passes through the outlet end of the rear conveying box 6, it further blocks the entry of external air into the rear conveying box 6 while blocking the overflow of a small amount of protective atmosphere inside the rear conveying box 6, serving the function of blocking the entry of external air into the furnace and the overflow of the protective atmosphere inside the furnace three times; through the push rod 13 and the compression spring 14, during the process of the workpiece and the limit seat 12 being conveyed through the outlet end of the rear conveying box 6 along with the mesh belt conveyor 1, while the push rod 13 moves together with the limit seat 12, the push rod 13 pushes the baffle 11 to turn the baffle 11 outward relative to the rear conveying box 6, facilitating the workpiece to smoothly pass through the outlet end of the rear conveying box 6 and be conveyed outside the rear conveying box 6. When the workpiece is completely conveyed outside the rear conveying box 6, the push rod 13 leaves the bottom of the baffle 11. Under the elastic force of the compression spring 14, the baffle 11 turns downward again to seal the outlet end of the rear conveying box 6, serving the function of automatically opening and closing the baffle 11; through the automatic cleaning mechanism, the impurities adhering to the upper layer of the mesh belt outside the rear conveying box 6 are automatically cleaned, serving the function of automatically cleaning the impurities on the mesh belt of the mesh belt conveyor 1, avoiding the blockage of the mesh belt caused by the accumulation of impurities on the upper layer of the mesh belt of the mesh belt conveyor 1, thereby affecting the sintering effect and the heat dissipation and cooling effect below the workpiece, and realizing the functions of improving the overall sintering effect, reducing costs, and automatic cleaning.

[0032] Further, the range of the included angle a formed by connecting the front section and the rear section of the front conveying box is [170°, 177°], and the height of the bottom of the front section of the front conveying box relative to the ground is greater than or equal to the height of the top of the rear conveying box 6 relative to the ground.

[0033] As can be seen from the above description, by setting the range of the included angle a formed by connecting the front section and the rear section of the front conveying box to [170°, 177°], it is avoided that the workpiece tilts and tumbles downward during the process of being conveyed to the rear end of the front conveying box, serving the function of ensuring the stability of workpiece conveying and the quality of workpiece conveying; by setting the height of the bottom of the front section of the front conveying box relative to the ground to be greater than or equal to the height of the top of the rear conveying box 6 relative to the ground, it is further avoided that too much protective atmosphere overflows from the rear section of the front conveying box to the outside of the outlet end of the rear conveying box 6, further ensuring the stability of the atmosphere inside the furnace, avoiding the oxidation of the workpiece, reducing the loss of overflow of the protective atmosphere, and serving the function of further improving the sintering effect and reducing the overall sintering cost.

[0034] Further, a silica gel foam sealing strip 15 arranged in an inverted U shape is connected to the edge of one side of the baffle 11 close to the sintering furnace 2, and limit grooves 16 for placing the silica gel foam sealing strip 15 are provided on three sides of the outlet end of the rear conveying box 6.

[0035] From the above description, it can be seen that the silicone foam sealing strip 15 is used to seal the upper side and left and right sides of the outlet end of the rear conveying box 6. The advantages of the silicone foam sealing strip, such as good elasticity, good heat resistance and aging resistance, are utilized to improve the sealing between the baffle 11 and the outlet end of the rear conveying box 6. At the same time, when the baffle 11 automatically flips over to contact the outlet end of the rear conveying box 6 again, damage to the baffle 11 caused by the mutual collision between the baffle 11 and the rear conveying box 6 is avoided, thereby improving the sealing and protecting the baffle 11. The silicone foam sealing strip 15 is placed through the limiting groove 16 to prevent the silicone foam sealing strip 15 and the baffle 11 from shaking left and right, thereby limiting the baffle 11 and the silicone foam sealing strip 15.

[0036] Furthermore, the automatic cleaning mechanism includes a frame 17, a scraper 18 and a shaking cylinder 19 respectively installed at the upper end and the middle part of the frame 17; the scraper 18 is located below the upper layer of the mesh belt of the mesh belt conveyor 1, and is used to clean the bottom of the upper layer of the mesh belt of the mesh belt conveyor 1, the top rod of the shaking cylinder 19 is connected to a shaking plate 20 that hits the top of the lower layer of the mesh belt of the mesh belt conveyor 1, and the lower end of the frame 17 is rotatably connected to a cleaning roller 21 located between the scraper 18 and the shaking cylinder 19; the cleaning roller 21 is connected along its circumference with several groups of soft bristles 22 for cleaning the bottom of the lower layer of the mesh belt of the mesh belt conveyor 1, and a clearance channel 55 for the push rod 13 to pass through is formed on both sides of the cleaning roller 21 and between the soft bristles, and the frame 17 is detachably connected to an upper collecting box 23 located below the scraper 18 and a lower collecting box 24 located below the shaking plate 20 and the cleaning roller 21.

[0037] From the above description, it can be known that as the upper layer of the mesh belt of the mesh belt conveyor 1 moves, the scraper 18 and the upper collecting box 23 are used to scrape off the impurities accumulated at the bottom of the upper layer of the mesh belt of the mesh belt conveyor 1. Under the action of gravity, the scraped impurities fall into the upper collecting box 23, which plays a role in preliminarily cleaning the mesh belt of the mesh belt conveyor 1 and automatically collecting impurities for the first time; through the shaking cylinder 19, the shaking plate 20 and the lower collecting box 24, the shaking cylinder 19 is started, and the top rod of the shaking cylinder 19 is reciprocated to drive the shaking plate 20 to reciprocate and impact the top surface of the lower layer of the mesh belt of the mesh belt conveyor 1, thereby shaking off the impurities accumulated in the lower layer of the mesh belt of the mesh belt conveyor 1, and the shaken impurities fall into the lower collecting box 23 under the action of gravity. The box 24 plays the role of secondary cleaning of the mesh belt of the mesh belt conveyor 1 and secondary automatic collection of impurities; through the cleaning roller 21 and the soft brush 22, as the lower layer of the mesh belt of the mesh belt conveyor 1 is driven, the cleaning roller 21 is driven to rotate, thereby driving the soft brush 22 to clean the impurities accumulated at the bottom of the lower layer of the mesh belt of the mesh belt conveyor 1, and the impurities brushed off by the soft brush 22 fall into the lower collecting box 24 under the action of gravity, which plays the role of tertiary cleaning of the mesh belt of the mesh belt conveyor 1 and tertiary automatic collection of impurities; through the yield channel 55, it is convenient for the push rod 13 to pass through, avoiding interference between the push rod 13 and the cleaning roller 21 and the soft brush 22. Since the soft brush 22 is soft, it can clean the passing limit seat 12.

[0038] Furthermore, a cleaning plate 25 for cleaning the soft bristles 22 is connected to the top of the lower collecting box 24 , and the cleaning plate 25 is provided with a group of through slots 26 for the soft bristles 22 to rotate through.

[0039] From the above description, it can be known that, through the cleaning plate 25 and the through groove 26, in the process of cleaning the lower layer bottom of the mesh belt of the mesh belt conveyor 1 by the cleaning roller 21 and the soft bristles, the soft bristles pass through the through groove 26, and the impurities adhered between the soft bristles are scraped off by the cleaning plate 25, and then fall into the collection box 24 under the action of gravity, which plays a role in further cleaning the soft bristles; avoiding the increase of impurities on the brush head surface of the cleaning roller 21 and the decrease in the cleaning effect of the soft brush on the mesh belt, thereby affecting the sintering quality of the product, thereby further ensuring the good sintering effect.

[0040] Further, a water curtain system located between the metal fiber cloth curtain 10 and the front conveying box is also installed in the rear conveying box 6. The water curtain system includes a long water spraying pipe 27, a water conveying pipe 28, a circulating water pipe 29 and a water tank 30. One end of the long water spraying pipe 27 is communicated with the upper end of the water tank 30 through the water conveying pipe 28. Water spraying holes 31 are formed at the bottom of the long water spraying pipe 27. A long hole 32 communicated with the water spraying holes 31 is formed at the top of the rear conveying box 6. A sealing box 33 is connected to the top of the rear conveying box 6. The long water spraying pipe 27 is installed in the sealing box 33. The bottom of the rear conveying box 6 is detachably communicated with a water storage box 34 located below the long water spraying pipe 27. A filter screen 35 is connected in the water storage box 34. A first water pump is installed on the circulating water pipe 29. The bottom of the water storage box 34 is communicated with the lower end of the water tank 30 through the circulating water pipe 29.

[0041] As can be seen from the above description, when the workpiece is conveyed into the rear conveying box 6, the workpiece first passes through the water curtain system, through the long water spraying pipe 27, the water conveying pipe 28, the water spraying holes 31, the circulating water pipe 29, the long hole 32 and the water tank 30. The water in the water tank 30 is pumped to the long water spraying pipe 27 by the first water pump. The water in the long water spraying pipe 27 is sprayed downward into the rear conveying box 6 from the water spraying holes 31 through the long hole 32 to form a vertical water curtain, which cools and washes the workpiece and the mesh belt, further blocks the outside air from entering the rear conveying box 6 and further prevents a small amount of protective atmosphere in the rear conveying box 6 from overflowing, ensuring the stability of the furnace atmosphere, reducing the atmosphere overflow, and playing a role in further improving the overall sintering and cooling effect and automatically cleaning the workpiece and the mesh belt; through the sealing box 33, it plays a role in preventing external air from entering the rear conveying box 6 through the long hole 32; through the water storage box 34 and the filter screen 35, the water after washing the workpiece is filtered, and the filtered water is re-conveyed to the water tank 30 through the circulating water pipe 29, playing a role in automatically filtering the circulating water of the water curtain system; by setting the water storage box 34 to be detachably connected to the bottom of the rear conveying box 6, when the filter screen 35 needs to be cleaned, it only needs to be disassembled, which plays a role in facilitating the disassembly of the water storage box 34 and the cleaning of the filter screen 35.

[0042] Further, a lower sealing plate 36 is connected to the lower end of the outlet end of the rear conveying box 6. The lower sealing plate 36 is located between the bottom of the upper layer of the mesh belt of the mesh belt conveyor 1 and the bottom of the outlet end of the rear conveying box 6. A groove 37 is formed at the top of the lower sealing plate 36 on the side away from the sintering furnace 2. A sealing roller 38 for supporting the mesh belt of the mesh belt conveyor 1 is rotatably connected in the groove 37.

[0043] As can be seen from the above description, through the lower sealing plate 36, the groove 37 and the sealing roller 38, the gap between the upper layer of the mesh belt of the mesh belt conveyor 1 and the bottom of the outlet end of the rear conveying box 6 is sealed, preventing external air from entering the rear conveying box 6 through this gap, or preventing a small amount of protective atmosphere from overflowing outside the rear conveying box 6 through this gap, which further improves the sealing performance of the outlet end of the rear conveying box 6; at the same time, the sealing roller 38 also serves to support the upper layer of the mesh belt of the mesh belt conveyor 1.

[0044] Furthermore, the front conveying box includes a slow cooling square pipe 3, a front pipe 4 and a rear pipe 5 that are sequentially interconnected along the workpiece conveying direction. Connecting flanges 39 are provided at both ends of the slow cooling square pipe 3, both ends of the front pipe 4, both ends of the rear pipe 5, and the inlet end of the rear conveying box 6. The connecting flanges 39 are connected with bolts. The outlet end of the sintering furnace 2 is communicated with one end of the slow cooling square pipe 3. An air inlet 40 for the protective atmosphere to enter is provided on one side of the slow cooling square pipe 3. A slow cooling box 41 is fixedly sleeved on the outer peripheral surface of the slow cooling square pipe 3. One side of the slow cooling box 41 is connected with a cooling fan 42 through a pipeline; there are two cooling boxes 8, and they are respectively fixedly sleeved on the outer peripheral surfaces of the front pipe 4 and the rear pipe 5, and the cooling boxes 8 are both connected with a cooling mechanism.

[0045] As can be seen from the above description, through the connecting flanges 39 and bolts, the connecting flanges 39 of the slow cooling square pipe 3, the front pipe 4, the rear pipe 5 and the rear conveying box 6 are detachably connected to each other in sequence, which serves to detachably connect the front conveying box and the rear conveying box 6 together; through the slow cooling square pipe 3, the slow cooling box 41 and the cooling fan 42, the workpieces output from the sintering furnace 2 are naturally cooled, preventing the workpieces from suddenly cooling at a low temperature and appearing microcracks, which serves to initially cool the workpieces; through the cooling boxes 8 of the front pipe 4 and the cooling boxes 8 of the rear pipe 5, the workpieces are cooled for the second and third times; when the front and rear conveying boxes 6 need to be overhauled or cleaned, only need to unscrew the bolts on the corresponding connecting flanges 39 and separate the corresponding connected connecting flanges 39 in sequence, then the front conveying box can be quickly disassembled, or the front conveying box can be quickly separated from the sintering furnace 2, or the front conveying box can be quickly disassembled from the rear conveying box 6.

[0046] Further, the cooling mechanism includes a slow cooling tank 43 and a water storage tank 44. A water inlet pipe 45 is connected between one end of the cooling box 8 and one side of the water storage tank 44. A conveying coil pipe 46 is connected between one side of the slow cooling tank 43 and the other side of the water storage tank 44. A second water pump is installed on the conveying coil pipe 46. An outlet pipe 47 is connected between the other end of the cooling box 8 and the other side of the slow cooling box 41. A temperature sensor 48 and a liquid level sensor are arranged in the water storage tank 44. The temperature sensor 48 is electrically connected to an external control system, and the liquid level sensor is electrically connected to the input end of the external control system. A drain port 50 and a water filling port 49 for connecting an external water source are arranged on one side of the water storage tank 44. Solenoid valves 51 are connected to both the water filling port 49 and the drain port 50. A set of cleaning ports 52 are opened on the top of the cooling box 8. A flip cover 53 is hinged to the cleaning port 52. A motor 54 for driving the flip cover 53 to rotate and open is installed on the top of the cooling box 8. Both the motor 54 and the solenoid valve 51 are electrically connected to the output end of the external control system.

[0047] As can be seen from the above description, through the slow cooling tank 43, the water storage tank 44, the water inlet pipe 45, the conveying coil pipe 46, the second water pump, and the outlet pipe 47, when the second water pump is started, the water in the water storage tank 44 is pumped into the water inlet pipe 45, enters the cooling box 8 from one end of the cooling box 8 to cool the workpiece in a non-contact manner, and the heat-exchanged water enters the outlet pipe 47 from the other end of the cooling box 8 and then enters the slow cooling tank 43 for preliminary cooling. The preliminarily cooled water is conveyed to the water storage tank 44 through the conveying coil pipe 46. During the conveying process of the water in the conveying coil pipe 46, heat exchange occurs with the air for secondary cooling, which plays the role of automatically conveying and circulating the cooling water.

[0048] Through the temperature sensor 48, the water filling port 49, the drain port 50, the solenoid valve 51, the motor 54 and the flip cover 53, when the temperature sensor 48 detects that the temperature of the water in the water storage tank 44 exceeds the highest value of the preset range, that is, when the cooling effect of the cooling water is poor, the temperature sensor 48 sends the detected temperature signal to the external control system. The external control system first controls the drain port 50 to open, discharges the water in the water storage tank 44 to the outside for collection until the water level in the water storage tank 44 reaches the preset minimum water level range value, then the external control system controls the solenoid valve 51 of the drain port 50 to close. The external control system then controls the water filling port 49 to open, and the external low-temperature water source enters the water storage tank 44 through the water filling port 49 until the water level in the water storage tank 44 reaches the preset maximum water level range value, and then the external control system controls the solenoid valve 51 of the water filling port 49 to close, which plays a role in ensuring good overall cooling effect; through the motor 54, the cleaning port 52 and the flip cover 53, when the temperature sensor 48 detects that the temperature of the water in the water storage tank 44 exceeds the highest value of the preset range, while the external control system controls the solenoid valve 51 to open, it also controls the motor 54 to start. When the motor 54 starts, it drives the flip cover 53 to open, so that the water in the cooling box 8 dissipates heat, which plays a role in further ensuring good overall cooling effect; in addition, the flip cover 53 and the cleaning port 52 are provided, and the external control system controls the motor 54 to open the flip cover 53, which also plays a role in facilitating the cleaning of the inside of the cooling box 8.

[0049] Referring to Figures 1 to 8 , the embodiments provided by the present utility model are as follows:

[0050] A powder metallurgy mesh belt type sintering furnace, including a mesh belt conveyor 1, a sintering furnace 2, a front conveying box and a rear conveying box 6 that are sequentially and mutually communicated along the workpiece conveying direction. The upper layer of the mesh belt of the mesh belt conveyor 1 passes through the sintering furnace 2, the front conveying box and the rear conveying box 6. The rear section of the front conveying box far from the sintering furnace 2 is inclined downward toward the rear conveying box 6. Inside the rear section at both ends of the front conveying box, there are rotatably connected mesh belt supporting rollers 7. An outer part of the front conveying box is fixedly sleeved with a cooling box 8 with circulating cooling water inside. The range of the included angle a formed by the connection of the front section and the rear section of the front conveying box is [170°, 177°]. The height of the bottom of the front section of the front conveying box relative to the ground is greater than or equal to the height of the top of the rear conveying box 6 relative to the ground; A dust-proof box 9 is communicated in the middle of the rear conveying box 6, and a metal fiber cloth curtain 10 for blocking air is installed in the dust-proof box 9. The metal fiber cloth curtain 10 in this embodiment uses a stainless steel fiber cloth. Taking advantage of the higher elasticity, wear resistance, high temperature resistance, corrosion resistance, reusability, and good flexibility of stainless steel fibers, it is not limited to this metal fiber cloth material. Any other metal fiber cloth material that can block the outside air from entering the front conveying box and has the advantages of wear resistance, high temperature resistance, softness and reusability is acceptable;

[0051] The front conveying box includes a slow cooling square pipe 3, a front pipe 4 and a rear pipe 5 that are sequentially interconnected along the workpiece conveying direction. Connecting flanges 39 are provided at both ends of the slow cooling square pipe 3, both ends of the front pipe 4, both ends of the rear pipe 5, and the inlet end of the rear conveying box 6. Bolts are connected to the connecting flanges 39. The outlet end of the sintering furnace 2 is communicated with one end of the slow cooling square pipe 3. An air inlet 40 for the protective atmosphere to enter is provided on one side of the slow cooling square pipe 3. A slow cooling box 41 is fixedly sleeved on the outer peripheral surface of the slow cooling square pipe 3. A cooling fan 42 is connected to the slow cooling box 41 through a pipeline on one side; There are two cooling boxes 8, which are respectively fixedly sleeved on the outer peripheral surfaces of the front pipe 4 and the rear pipe 5, and the cooling boxes 8 are both connected with cooling mechanisms;

[0052] The cooling mechanism includes a slow cooling tank 43 and a water storage tank 44. A water inlet pipe 45 is communicated between one end of the cooling box 8 and one side of the water storage tank 44. A conveying coil pipe 46 is communicated between one side of the slow cooling tank 43 and the other side of the water storage tank 44. A second water pump (not marked in the figure, the same throughout the text) is installed on the conveying coil pipe 46. An outlet pipe 47 is communicated between the other end of the cooling box 8 and the other side of the slow cooling box 41. A temperature sensor 48 and a liquid level sensor are provided in the water storage tank 44. The temperature sensor 48 is electrically connected to an external control system. The liquid level sensor (not marked in the figure, the same throughout the text) is electrically connected to the input end of the external control system (not marked in the figure, the same throughout the text). A drain port 50 and a water filling port 49 for connecting an external water source are provided on one side of the water storage tank 44. Solenoid valves 51 are connected to both the water filling port 49 and the drain port 50. A group of cleaning ports 52 are opened at the top of the cooling box 8. A flip cover 53 is hinged to the cleaning ports 52. A motor 54 for driving the flip cover 53 to rotate and open is installed on the top of the cooling box 8. The motor 54 and the solenoid valves 51 are both electrically connected to the output end of the external control system.

[0053] A baffle 11 is provided at the outlet end of the rear conveying box 6. The top of the baffle 11 is hinged to the top of the outlet end of the rear conveying box 6. A number of limiting seats 12 for preventing the workpiece from moving are installed on the mesh belt of the mesh belt conveyor 1. Push rods 13 that are located above the workpiece and push the baffle 11 to flip out of the rear conveying box 6 are erected on both sides of the limiting seats 12. A compression spring 14 is connected between the outlet end of the rear conveying box 6 and the baffle 11. A silicone foam sealing strip 15 arranged in an inverted U shape is connected to the edge of the side surface of the baffle 11 close to the sintering furnace 2. Limiting grooves 16 for placing the silicone foam sealing strip 15 are opened on three sides of the outlet end of the rear conveying box 6; A lower sealing plate 36 is connected to the lower end of the outlet end of the rear conveying box 6. The lower sealing plate 36 is located between the upper layer bottom of the mesh belt of the mesh belt conveyor 1 and the bottom of the outlet end of the rear conveying box 6. A groove 37 is opened on the top of the lower sealing plate 36 away from the sintering furnace 2. A sealing roller 38 for supporting the mesh belt of the mesh belt conveyor 1 is rotatably connected in the groove 37; An automatic cleaning mechanism for cleaning the mesh belt of the mesh belt conveyor 1 is erected outside the outlet end of the rear conveying box 6;

[0054] The automatic cleaning mechanism includes a frame 17, a scraper 18 and a shaking cylinder 19 respectively installed at the upper end and the middle part of the frame 17; the scraper 18 is located below the upper layer of the mesh belt of the mesh belt conveyor 1 and is used to clean the bottom of the upper layer of the mesh belt of the mesh belt conveyor 1, the top rod of the shaking cylinder 19 is connected to a shaking plate 20 that hits the top of the lower layer of the mesh belt of the mesh belt conveyor 1, and the lower end of the frame 17 is rotatably connected to a cleaning roller 21 located between the scraper 18 and the shaking cylinder 19; the cleaning roller 21 is connected along its circumference with several The dry group is used to clean the soft bristles 22 at the bottom of the lower layer of the mesh belt of the mesh belt conveyor 1. A clearance channel 55 for the push rod 13 to pass through is formed between the two sides of the cleaning roller 21 and the soft bristles 22. The frame 17 is detachably connected with an upper collecting box 23 located below the scraper 18 and a lower collecting box 24 located below the shaking plate 20 and the cleaning roller 21; a cleaning plate 25 for cleaning the soft bristles 22 is connected to the top of the lower collecting box 24, and the cleaning plate 25 is provided with a group of through grooves 26 for the soft bristles 22 to rotate through.

[0055] A water curtain system located between the metal fiber curtain 10 and the front conveying box is also installed in the rear conveying box 6, and the water curtain system includes a long water spraying tube 27, a water delivery pipe 28, a circulating water pipe 29 and a water tank 30. One end of the long water spraying tube 27 is connected to the upper end of the water tank 30 through the water delivery pipe 28. A water spraying hole 31 is opened at the bottom of the long water spraying tube 27, and a long hole 32 communicating with the water spraying hole 31 is opened at the top of the rear conveying box 6. A sealing box 33 is connected to the top of the rear conveying box 6, and the long water spraying tube 27 is installed in the sealing box 33. The bottom of the rear conveying box 6 is detachably connected to a water storage box 34 located below the long water spraying tube 27, and a filter screen 35 is connected to the water storage box 34. The circulating water pipe 29 is installed with a first water pump (not shown in the figure, the same as the whole text), and the bottom of the water storage box 34 is connected to the lower end of the water tank 30 through the circulating water pipe 29.

[0056] In summary, compared with the prior art, the utility model has the advantages of good sintering and cooling effects, low cost and convenient automatic cleaning; by setting the rear section of the front conveying box to be inclined downward in the direction close to the rear conveying box 6, it plays a role in initially blocking the entry of external air into the furnace and preventing the overflow of the protective atmosphere in the furnace; through the mesh belt support roller 7 and the limit seat 12, it avoids the workpiece from colliding with the inner wall of the rear section of the front conveying box and the workpieces in the front and rear groups from rolling or colliding with each other as the mesh belt inclines downward, playing a role in limiting the workpiece and ensuring the conveying efficiency of the workpiece; through the dust-proof box 9 and the metal fiber cloth curtain 10, it facilitates the passage of the workpiece and further reduces the overflow of the protective atmosphere. At the same time, it secondarily blocks the entry of external air and the overflow of a small amount of protective atmosphere in the rear conveying box 6, playing a role in secondarily blocking the entry of external air into the furnace and preventing the overflow of the protective atmosphere in the furnace; through the baffle 11, it plays a role in thirdly blocking the entry of external air into the furnace and preventing the overflow of the protective atmosphere in the furnace; through the push rod 13 and the compression spring 14, when the workpiece is conveyed to the outlet end of the rear conveying box 6, while the push rod 13 moves together with the workpiece and the limit seat 12, it pushes the baffle 11 to turn outward from the rear conveying box 6 until the workpiece is completely conveyed outside the rear conveying box 6, the push rod 13 leaves the bottom of the baffle 11, and under the elastic force of the compression spring 14, the baffle 11 reseals the outlet end of the rear conveying box 6, playing a role in automatically opening and closing the baffle 11; through the automatic cleaning mechanism, it plays a role in automatically cleaning the impurities on the mesh belt of the mesh belt conveyor 1.

[0057] The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not limited to the above embodiments. All technical solutions falling within the concept of the utility model belong to the protection scope of the utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the utility model, several improvements and retouches should also be regarded as within the protection scope of the utility model.

Claims

1. A powder metallurgy mesh belt sintering furnace, characterized in that: It includes a mesh belt conveyor, a sintering furnace, a front conveyor box and a rear conveyor box that are sequentially interconnected along the workpiece conveying direction. The upper layer of the mesh belt of the mesh belt conveyor passes through the sintering furnace, the front conveyor box and the rear conveyor box. The rear section of the front conveyor box away from the sintering furnace is inclined downward towards the rear conveyor box. Mesh belt support rollers are rotatably connected inside both ends of the rear section of the front conveyor box. A cooling box with circulating cooling water is fixedly sleeved outside the front conveyor box. A dust-proof box is connected to the middle of the rear conveyor box. A metal fiber cloth curtain for blocking air is installed inside the dust-proof box. A baffle is provided at the outlet end of the rear conveyor box. The top of the baffle is hinged to the top of the outlet end of the rear conveyor box. A number of limit seats for preventing the workpiece from moving are installed on the mesh belt of the mesh belt conveyor. Push rods are arranged on both sides of the limit seat above the workpiece and used to push the baffle to turn outwards from the rear conveyor box. A compression spring is connected between the outlet end of the rear conveyor box and the baffle. An automatic cleaning mechanism for cleaning the mesh belt of the mesh belt conveyor is arranged outside the outlet end of the rear conveyor box.

2. The powder metallurgy mesh belt type sintering furnace according to claim 1, characterized in that: The range of the included angle a formed by the connection of the front section and the rear section of the front conveyor box is [170°, 177°], and the height of the bottom of the front section of the front conveyor box relative to the ground is greater than or equal to the height of the top of the rear conveyor box relative to the ground.

3. A powder metallurgy mesh belt type sintering furnace according to claim 1, characterized in that: A silicone foam sealing strip arranged in an inverted U shape is connected to the edge of one side of the baffle close to the sintering furnace. Limit grooves for placing the silicone foam sealing strip are opened on three sides of the outlet end of the rear conveyor box.

4. A powder metallurgy mesh belt type sintering furnace according to claim 1, characterized in that: The automatic cleaning mechanism includes a frame, a scraper and a shaking cylinder respectively installed at the upper end and the middle of the frame. The scraper is located below the upper layer of the mesh belt of the mesh belt conveyor and is used to clean the bottom of the upper layer of the mesh belt of the mesh belt conveyor. The top rod of the shaking cylinder is connected to a shaking plate that impacts the top of the lower layer of the mesh belt of the mesh belt conveyor. A cleaning roller is rotatably connected to the lower end of the frame between the scraper and the shaking cylinder. A number of groups of soft bristles for cleaning the bottom of the lower layer of the mesh belt of the mesh belt conveyor are connected along the circumference of the cleaning roller. A clearance channel for the push rod to pass through is formed between both sides of the cleaning roller and the soft bristles. An upper collection box is detachably connected to the frame below the scraper, and a lower collection box is located below the shaking plate and the cleaning roller.

5. A powder metallurgy mesh belt type sintering furnace according to claim 4, characterized in that: A cleaning plate for cleaning the soft bristles is connected to the top of the lower collection box. A set of through grooves for the soft bristles to rotate through are opened on the cleaning plate.

6. The powder metallurgy mesh belt type sintering furnace according to claim 1, characterized in that: A water curtain system is also installed in the rear conveying box between the metal fiber cloth curtain and the front conveying box. The water curtain system includes a long water spraying pipe, a water conveying pipe, a circulating water pipe and a water tank. One end of the long water spraying pipe is communicated with the upper end of the water tank through the water conveying pipe. The bottom of the long water spraying pipe is provided with water spraying holes. The top of the rear conveying box is provided with long holes communicated with the water spraying holes. The top of the rear conveying box is connected with a sealing box. The long water spraying pipe is installed in the sealing box. The bottom of the rear conveying box is detachably communicated with a water storage box located below the long water spraying pipe. A filter screen is connected in the water storage box. A first water pump is installed on the circulating water pipe. The bottom of the water storage box is communicated with the lower end of the water tank through the circulating water pipe.

7. A powder metallurgy mesh belt type sintering furnace according to claim 1, characterized in that: A lower sealing plate is connected to the lower end of the outlet end of the rear conveying box. The lower sealing plate is located between the bottom of the upper layer of the mesh belt of the mesh belt conveyor and the bottom of the outlet end of the rear conveying box. A groove is opened on the top of the lower sealing plate on the side far away from the sintering furnace. A sealing roller for supporting the mesh belt of the mesh belt conveyor is rotatably connected in the groove.

8. The powder metallurgy mesh belt type sintering furnace according to claim 1, wherein: The front conveying box includes a slow cooling square pipe, a front pipe and a rear pipe which are sequentially communicated with each other along the workpiece conveying direction. Connecting flanges are arranged at both ends of the slow cooling square pipe, both ends of the front pipe, both ends of the rear pipe and the inlet end of the rear conveying box. The connecting flanges are connected with bolts. The outlet end of the sintering furnace is communicated with one end of the slow cooling square pipe. An air inlet for allowing a protective atmosphere to enter is arranged on one side of the slow cooling square pipe. A slow cooling box is fixedly sleeved on the outer peripheral surface of the slow cooling square pipe. One side of the slow cooling box is communicated with a cooling fan through a pipeline; There are two cooling boxes, which are respectively fixedly sleeved on the outer peripheral surfaces of the front pipe and the rear pipe. The cooling boxes are respectively connected with a cooling mechanism.

9. The powder metallurgy mesh belt type sintering furnace according to claim 8, characterized in that: The cooling mechanism includes a slow cooling tank and a water storage tank. A water inlet pipe is communicated between one end of the cooling box and one side of the water storage tank. A conveying coiled pipe is communicated between one side of the slow cooling tank and the other side of the water storage tank. A second water pump is installed on the conveying coiled pipe. An outlet pipe is communicated between the other end of the cooling box and the other side of the slow cooling box. A temperature sensor and a liquid level sensor are arranged in the water storage tank. The temperature sensor is electrically connected with an external control system. The liquid level sensor is electrically connected with the input end of the external control system. A drain port and a water filling port for connecting an external water source are arranged on one side of the water storage tank. Solenoid valves are connected to the water filling port and the drain port. A group of cleaning ports are opened on the top of the cooling box. A flip cover is hinged to the cleaning port. A motor for driving the flip cover to rotate and open is installed on the top of the cooling box. The motor and the solenoid valve are both electrically connected with the output end of the external control system.

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