A tungsten carbide powder preparation system and preparation method thereof

Abstract

This invention discloses a tungsten carbide powder preparation system and method, relating to the field of powder metallurgy. The system includes a mixing device, a conveying device, a sintering device, and a grinding device. The mixing device mixes and crushes raw materials into a mixed powder. The conveying device transports the mixed powder. The sintering device includes a sintering furnace and a cooling furnace, through which the mixed powder sequentially passes to form tungsten carbide. The grinding device crushes the tungsten carbide to obtain tungsten carbide powder. A circulating cooling device is externally installed on the cooling furnace. This tungsten carbide powder preparation system and method, through the use of an upper filter frame, air bladder, and nozzles, achieves the effect of filtering the coolant. Simultaneously, it relies on the liquid flow to clean impurities, avoiding clogging of the circulating cooling device, ensuring cooling effect, improving the preparation efficiency of tungsten carbide powder, and periodically increasing the speed of coolant spray to flush away impurities remaining on the upper filter frame, improving the impurity cleaning effect.

Description

Technical Field

[0001] This invention relates to the field of powder metallurgy, and in particular to a tungsten carbide powder preparation system and preparation method. Background Technology

[0002] Tungsten carbide is a compound composed of tungsten and carbon. It is a black hexagonal crystal with a metallic luster and a hardness similar to diamond. It is an excellent conductor of electricity and heat. Tungsten carbide powder is widely used in the production of cemented carbide materials, such as in the manufacture of cutting tools, wear-resistant parts, smelting crucibles for metals such as copper, cobalt, and bismuth, and wear-resistant semiconductor thin films.

[0003] The preparation of tungsten carbide powder generally includes: mixing tungsten powder with carbon black, carbonization, ball milling, and sieving. The carbonization process includes feeding, sintering, cooling, and discharging.

[0004] For example, the patent titled "A Tungsten Carbide Powder Preparation System" (patent publication number: CN114132927A) discloses a tungsten carbide powder preparation system. By setting up a circulating conveying device, the feeding, sintering, cooling, and discharging processes can be carried out continuously, dynamically carbonizing the raw materials. This allows for rapid and continuous production of tungsten carbide powder, greatly improving production efficiency and facilitating large-scale industrial production. However, in actual use, the circulating water cooling device outside the cooling furnace in this preparation system experiences repeated heating and cooling of the water during circulation, which can easily lead to impurities. Long-term use can cause blockages in the circulating water cooling device, reducing the cooling effect and affecting the preparation efficiency of tungsten carbide powder.

[0005] Therefore, it is necessary to propose a tungsten carbide powder preparation system and preparation method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a tungsten carbide powder preparation system and preparation method to solve the problem that the water inside the circulating water cooling device is repeatedly heated and cooled during the circulation process, which easily leads to impurities. Long-term use will cause blockage of the circulating water cooling device, reduce the cooling effect, and affect the preparation efficiency of tungsten carbide powder.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a tungsten carbide powder preparation system, comprising a mixing device, a conveying device, a sintering device, and a grinding device. The mixing device is used to mix and crush raw materials into mixed powder. The conveying device is used to convey the mixed powder. The sintering device includes a sintering furnace and a cooling furnace. The mixed powder passes through the sintering furnace and the cooling furnace in sequence to form tungsten carbide. The grinding device is used to crush the tungsten carbide to obtain tungsten carbide powder.

[0008] The cooling furnace is equipped with a circulating cooling device, which includes a spiral tube and a filter box. The spiral tube surrounds the outside of the cooling furnace, and the filter box is located outside the cooling furnace. The coolant circulates inside the spiral tube and filters impurities inside the filter box. The filter box is equipped with an upper filter rack for filtering impurities.

[0009] The filter box is equipped with an air bladder that communicates with and cooperates with the spiral tube. The bottom end of the air bladder is connected to a second liquid pipe. The end of the second liquid pipe away from the air bladder extends into the interior of the filter box and is connected to a round pipe. The round pipe is located above the upper filter frame and is connected to a nozzle. A solenoid valve is fixedly installed on the second liquid pipe. When the solenoid valve is closed, coolant accumulates inside the air bladder, causing the air bladder to expand. When the solenoid valve is opened, the contraction elasticity of the air bladder accelerates the coolant sprayed from the nozzle, flushing away the impurities accumulated on the upper filter frame.

[0010] Preferably, a lower filter frame is fixedly connected inside the filter box, and a plurality of first filter holes are formed through the lower filter frame. An accumulation area is formed between the lower filter frame and the inner wall of the filter box. The upper filter frame is hinged to the top of the lower filter frame. Both the lower filter frame and the upper filter frame are inclined. The end of the upper filter frame closer to the lower filter frame is inclined downward, and the end of the lower filter frame away from the upper filter frame is inclined downward. A sliding groove is formed on the upper surface of the upper filter frame. Multiple sliding grooves are formed and evenly distributed. A plurality of second filter holes are formed through the bottom of the sliding groove.

[0011] Preferably, an elastic strip is fixedly connected to the end of the upper filter frame away from the lower filter frame, and the end of the elastic strip away from the upper filter frame is fixedly connected to the inner wall of the filter box.

[0012] Preferably, a top box is fixedly connected to the top of the outer wall of the filter box, the air bladder is fixedly connected inside the top box, a circular groove is opened at the bottom of the top box for the second liquid pipe to pass through, the top of the air bladder is connected to a first liquid pipe, and the end of the first liquid pipe away from the air bladder passes through the top box and is connected to a spiral tube.

[0013] Preferably, a cylinder is fixedly connected to the inner wall of the filter box, and a sliding column is slidably arranged inside the cylinder, with the sliding column passing through the end of the cylinder away from the inner wall of the filter box. A first spring is arranged inside the cylinder, with one end of the first spring fixedly connected to the sliding column and the other end of the first spring fixedly connected to the inner wall of the cylinder. A U-shaped frame is fixedly connected to the end of the sliding column located outside the cylinder, and a rotating shaft is rotatably connected to the U-shaped frame. An extrusion column is fixedly connected to the rotating shaft and is attached to the bottom of the upper filter frame.

[0014] Preferably, an air cavity is formed between the outer wall of the airbag and the inner wall of the top box, and an air pipe is fixedly connected to the bottom of the top box and communicates with the air cavity. The air pipe extends into the interior of the filter box and communicates with the cylinder.

[0015] Preferably, a support plate is fixedly connected to the inner walls of both sides of the airbag, and a second spring is fixedly connected between the two support plates.

[0016] Preferably, both ends of the circular tube are fixedly connected to circular blocks, and the end of the circular block away from the circular tube is rotatably connected to the side wall of the filter box. A motor is fixedly connected to the outer wall of the filter box, and one of the circular blocks is fixedly connected to the drive shaft of the motor.

[0017] Preferably, a cooling chamber is formed between the bottom of the lower filter frame, the upper filter frame, and the filter box. A cooling device is installed inside the cooling chamber. A pump body is fixedly connected to the outer wall of the filter box. The inlet end of the pump body is connected to the cooling chamber, and the outlet end of the pump body is connected to a third liquid pipe. The end of the third liquid pipe away from the pump body is connected to a spiral tube.

[0018] The present invention also proposes a method for preparing tungsten carbide powder, including the above-mentioned tungsten carbide powder preparation system, and further including the following steps:

[0019] S1. Sintering: The raw materials are mixed and crushed into mixed powder, and the mixed powder is sintered.

[0020] S2. Cooling: After sintering, the material is cooled in a cooling furnace by a circulating cooling device. The upper filter frame filters impurities in the cooling liquid of the circulating cooling device, and the air bladder expands periodically to accelerate the speed of the cooling liquid spraying out, relying on the liquid flow to flush away impurities on the upper filter frame.

[0021] S3. Grinding: Tungsten carbide is crushed to obtain tungsten carbide powder.

[0022] The technical effects and advantages of this invention are as follows:

[0023] This invention achieves the effect of filtering coolant by setting up structures such as an upper filter frame, air bag and nozzle, while relying on the liquid flow to clean impurities, avoiding blockage of the circulating cooling device, ensuring cooling effect, improving the preparation efficiency of tungsten carbide powder, and periodically increasing the speed of coolant spraying to flush away impurities remaining on the upper filter frame, thereby improving the impurity cleaning effect.

[0024] The motor drives the circular tube to rotate via a circular block, adjusting the angle of the liquid flow from the nozzle. This prevents continuous scouring of the same spot on the upper filter frame, which would cause wear and extend its service life. At the same time, it can expand the coverage area of ​​the liquid flow during the impurity cleaning process.

[0025] Because the upper filter frame is tilted, when the coolant falls onto the upper filter frame, it will flow towards the lower filter frame in the chute. During the flow, the coolant drips through the second filter hole into the cooling chamber, and impurities slide down with the liquid flow to the accumulation area and accumulate on the lower filter frame. The coolant that slides down with the impurities to the accumulation area can drip through the first filter hole into the cooling chamber, thus achieving the effect of filtering the coolant. At the same time, the liquid flow cleans the impurities, avoiding blockage of the circulating cooling device, ensuring the cooling effect, and improving the preparation efficiency of tungsten carbide powder.

[0026] The upper filter frame swings up and down, creating a shaking effect that accelerates the sliding speed of impurities and speeds up the spraying of coolant. This, combined with the swinging motion of the upper filter frame, improves the cleaning effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the tungsten carbide powder preparation system of the present invention.

[0028] Figure 2 This is a schematic diagram of the filter box and top box structure of the present invention.

[0029] Figure 3 This is a schematic diagram of the lower and upper filter frames of the present invention.

[0030] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0031] Figure 5 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B.

[0032] Figure 6 For the present invention Figure 3 Enlarged schematic diagram of the structure at point C.

[0033] Figure 7 This is a schematic diagram of the slide and the second filter hole structure of the present invention.

[0034] Figure 8 This is a schematic diagram of the U-shaped frame and rotating shaft structure of the present invention.

[0035] Figure 9 This is a schematic diagram of the filter box and circular tube structure of the present invention.

[0036] Figure 10 For the present invention Figure 9 Enlarged schematic diagram of the structure at point D.

[0037] Figure 11 This is a schematic diagram of the nozzle and circular tube structure of the present invention.

[0038] Figure 12 This is a schematic diagram of the top box and airbag structure of the present invention.

[0039] In the diagram: 1. Mixing device; 2. Conveying device; 3. Sintering device; 4. Sintering furnace; 5. Cooling furnace; 6. Grinding device; 7. Spiral tube; 8. Filter box; 9. Lower filter frame; 10. First filter hole; 11. Upper filter frame; 12. Slide groove; 13. Second filter hole; 14. Elastic strip; 15. Cooling chamber; 16. Top box; 17. Airbag; 18. First liquid pipe; 19. Air chamber; 20. Second liquid pipe; 21. Solenoid valve; 22. Circular tube; 23. Circular block; 24. Motor; 25. Nozzle; 26. Cylinder; 27. Sliding column; 28. U-shaped frame; 29. ​​Rotating shaft; 30. Extrusion column; 31. First spring; 32. Air pipe; 33. Cooling device; 34. Pump body; 35. Third liquid pipe; 36. Support plate; 37. Second spring; 38. Stacking area. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] This invention provides, for example Figures 1-12 The system for preparing tungsten carbide powder shown includes a mixing device 1, a conveying device 2, a sintering device 3, and a grinding device 6. The mixing device 1 includes structures such as an air jet mill for mixing and crushing raw materials into a mixed powder. The conveying device 2 includes structures such as a screw conveyor for conveying the mixed and crushed powder. The sintering device 3 includes a sintering furnace 4 and a cooling furnace 5, through which the mixed powder sequentially passes to form tungsten carbide. The grinding device 6 includes structures such as a grinding barrel for crushing the tungsten carbide to obtain tungsten carbide powder. The preparation of tungsten carbide powder and its working principle are common existing technologies and will not be elaborated upon here.

[0042] In practical use, the mixed powder is loaded into a graphite container and conveyed by the conveying device 2. The graphite container passes through the sintering furnace 4 and the cooling furnace 5, and is fed, sintered, cooled and discharged in sequence to carbonize the raw materials.

[0043] The cooling furnace 5 is equipped with a circulating cooling device. Considering that the coolant inside the circulating cooling device repeatedly heats up and cools down during circulation, impurities are easily generated, which can lead to blockage of the circulating cooling device after long-term use, reducing the cooling effect and affecting the preparation efficiency of tungsten carbide powder. Therefore, the circulating cooling device in this invention includes a spiral tube 7 and a filter box 8. The spiral tube 7 surrounds the outside of the cooling furnace 5. In specific use, a protective shell (not shown in the figure) can be installed on the outside of the cooling furnace 5 to protect the spiral tube 7 inside. The filter box 8 is located outside the cooling furnace 5 and can be mounted on the cooling furnace 5 with a fixed bracket. The position of the filter box 8 is fixed and can be adjusted according to specific usage. The filter box 8 is filled with coolant, but water can also be used.

[0044] The coolant circulates inside the spiral tube 7 and filters impurities inside the filter box 8. The coolant flows inside the spiral tube 7 to cool the sintered tungsten carbide, maintain the ultra-fine grain size of the material, prevent oxidation and decarburization, improve product utilization and reduce preparation costs.

[0045] The filter box 8 is internally equipped with an upper filter frame 11 for filtering impurities. A lower filter frame 9 is fixedly connected inside the filter box 8. Several first filter holes 10 are formed through the lower filter frame 9, and the inner diameter of each first filter hole 10 is small, allowing coolant to pass through while impurities cannot. An accumulation zone 38 is formed between the lower filter frame 9 and the inner wall of the filter box 8. The upper filter frame 11 is hinged to the top of the lower filter frame 9. Both the lower filter frame 9 and the upper filter frame 11 are inclined and have an L-shaped structure (see reference). Figure 3 This design allows the accumulation zone 38 to have a certain depth for impurities to accumulate. The end of the upper filter frame 11 closest to the lower filter frame 9 is inclined downwards, and the end of the lower filter frame 9 furthest from the upper filter frame 11 is also inclined downwards, facilitating the sliding of coolant and impurities. Furthermore, the coolant enters the interior of the filter box 8 from above the end of the upper filter frame 11 furthest from the lower filter frame 9 and falls onto the upper filter frame 11.

[0046] The upper filter frame 11 is hinged to the top of the lower filter frame 9, allowing the upper filter frame 11 to swing at a certain angle, accelerating the sliding speed of impurities.

[0047] The upper surface of the upper filter frame 11 is provided with a sliding groove 12. Multiple sliding grooves 12 are provided and evenly distributed. Several second filter holes 13 are provided through the bottom of the sliding groove 12. The inner diameter of the second filter holes 13 is small, so that coolant can pass through but impurities cannot. The sliding groove 12 is provided to guide the liquid flow and increase the speed of the filtration flow.

[0048] Specifically, due to the inclined setting of the upper filter frame 11, when the coolant falls on the upper filter frame 11, it will flow towards the lower filter frame 9 in the sliding groove 12. During the flow, the coolant drips through the second filter hole 13 into the cooling chamber 15, and impurities slide down with the liquid flow to the accumulation area 38 and accumulate on the lower filter frame 9. The coolant that slides down with the impurities to the accumulation area 38 can drip through the first filter hole 10 into the cooling chamber 15, achieving the effect of filtering the coolant. At the same time, the liquid flow cleans the impurities, avoiding blockage of the circulating cooling device, ensuring the cooling effect, and improving the preparation efficiency of tungsten carbide powder.

[0049] The coolant that slides down with the impurities into the accumulation area 38 can drip through the first filter hole 10 into the cooling chamber 15.

[0050] Furthermore, the filter box 8 is equipped with a material chute and a cover plate at the accumulation area 38. By opening the cover plate, the impurities accumulated on the lower filter frame 9 can be removed through the material chute.

[0051] A small amount of impurities will adhere to the upper filter frame 11. With the continuous use of the circulating cooling device, when there are more impurities attached to the upper filter frame 11, the filtration effect will still be affected. Therefore, the present invention provides an air bag 17 connected to the spiral tube 7 on the outside of the filter box 8. The bottom end of the air bag 17 is connected to a second liquid pipe 20. The end of the second liquid pipe 20 away from the air bag 17 extends into the interior of the filter box 8 and is connected to a circular pipe 22. The circular pipe 22 is located above the upper filter frame 11 and is connected to a nozzle 25. Multiple nozzles 25 are provided, and the nozzles 25 can correspond to the position of the slide groove 12. After the coolant flows out of the interior of the spiral tube 7, it enters the interior of the circular pipe 22 through the air bag 17 and the second liquid pipe 20, and flows out through the nozzle 25.

[0052] A top box 16 is fixedly connected to the top of the outer wall of the filter box 8. An air bladder 17 is fixedly connected inside the top box 16. A circular groove is opened at the bottom of the top box 16 for the second liquid pipe 20 to pass through. The top of the air bladder 17 is connected to the first liquid pipe 18. The end of the first liquid pipe 18 away from the air bladder 17 passes through the top box 16 and is connected to the spiral tube 7.

[0053] A solenoid valve 21 is fixedly installed on the second liquid pipe 20. When the solenoid valve 21 is closed, the coolant accumulates inside the air bag 17 and causes the air bag 17 to expand. When the solenoid valve 21 is opened, the contraction elasticity of the air bag 17 causes the coolant sprayed from the nozzle 25 to accelerate and flush away the impurities accumulated on the upper filter frame 11.

[0054] Specifically, when there are many impurities remaining on the upper filter frame 11, the solenoid valve 21 is closed. When the coolant flows into the airbag 17 from the first liquid pipe 18, the coolant accumulates inside the airbag 17 and causes the airbag 17 to expand because the solenoid valve 21 is closed at this time.

[0055] When the airbag 17 inflates to a certain extent, the solenoid valve 21 opens. Coolant enters the interior of the circular tube 22 through the second liquid pipe 20 and is sprayed onto the upper filter frame 11 through the nozzle 25. Under the contraction elasticity of the airbag 17, the speed at which the coolant is sprayed from the nozzle 25 is accelerated, flushing away the impurities remaining on the upper filter frame 11, improving the impurity cleaning effect, ensuring the filtration effect of the upper filter frame 11, and the impurities slide down to the accumulation area 38.

[0056] Repeat the opening and closing of the solenoid valve 21 times in the above and below steps to periodically increase the speed of coolant spraying.

[0057] A pressure sensor or other structure can be installed at the airbag 17 to monitor the degree of inflation of the airbag 17 and prevent bursting.

[0058] By setting up structures such as the upper filter frame 11, air bag 17 and nozzle 25, the coolant is filtered. At the same time, the liquid flow cleans impurities, avoiding blockage of the circulating cooling device, ensuring cooling effect, improving the preparation efficiency of tungsten carbide powder, and periodically increasing the speed of coolant spraying to flush away residual impurities on the upper filter frame 11, thus improving the impurity cleaning effect.

[0059] A cooling chamber 15 is formed between the bottom of the lower filter frame 9, the upper filter frame 11 and the bottom of the filter box 8, and the liquid level of the coolant is lower than the lowest point of the lower filter frame 9. A cooling device 33 is installed inside the cooling chamber 15. The cooling device 33 includes structures such as semiconductor cooling chips. When powered on, it can cool the coolant in the cooling chamber 15.

[0060] A pump body 34 is fixedly connected to the outer wall of the filter box 8. The inlet end of the pump body 34 is connected to the cooling chamber 15, and the outlet end of the pump body 34 is connected to the third liquid pipe 35. The end of the third liquid pipe 35 away from the pump body 34 is connected to the spiral pipe 7.

[0061] During operation, the cooling device 33 is activated to cool the coolant in the cooling chamber 15. Then, the solenoid valve 21 is opened to start the pump body 34. The pump body 34 draws the cooled coolant from the cooling chamber 15 and delivers it to the spiral tube 7 through the third liquid pipe 35. The coolant flows inside the spiral tube 7 to cool the sintered tungsten carbide, maintain the ultra-fine grain size of the material, prevent oxidation and decarburization, improve product utilization and reduce preparation costs.

[0062] After the coolant flows out of the spiral tube 7, it flows into the airbag 17 through the first liquid pipe 18, then enters the round tube 22 through the second liquid pipe 20, and flows out through the nozzle 25.

[0063] Considering that if the angle of the nozzle 25 is fixed, the same position of the upper filter frame 11 will be continuously scoured, which will easily cause wear after long-term use, round blocks 23 are fixedly connected to both ends of the round tube 22. The end of the round block 23 away from the round tube 22 is rotatably connected to the side wall of the filter box 8. A motor 24 is fixedly connected to the outer wall of the filter box 8, and one of the round blocks 23 is fixedly connected to the drive shaft of the motor 24.

[0064] During operation, the motor 24 drives the circular tube 22 to rotate through the circular block 23, adjusting the angle of the liquid flow sprayed from the nozzle 25 to avoid continuous scouring of the same position on the upper filter frame 11, which would cause wear and extend its service life. At the same time, during the impurity cleaning process, the coverage area of ​​the liquid flow can be expanded.

[0065] After the coolant flows out of the spiral tube 7, it will flow into the airbag 17 through the first liquid pipe 18. At this time, the solenoid valve 21 is in the open state, and the coolant enters the round tube 22 through the second liquid pipe 20 and flows out through the nozzle 25.

[0066] Because the upper filter frame 11 is inclined, when the coolant falls on the upper filter frame 11, it will flow in the direction of the lower filter frame 9 in the slide groove 12. During the flow, the coolant drips through the second filter hole 13 into the cooling chamber 15 for recycling. Impurities slide down with the liquid flow to the accumulation area 38 and accumulate on the lower filter frame 9.

[0067] To enable the upper filter frame 11 to swing and accelerate the sliding speed of impurities, a cylinder 26 is fixedly connected to the inner wall of the filter box 8. A sliding column 27 is slidably disposed inside the cylinder 26, and the sliding column 27 passes through the end of the cylinder 26 away from the inner wall of the filter box 8. A first spring 31 is disposed inside the cylinder 26, with one end of the first spring 31 fixedly connected to the sliding column 27 and the other end of the first spring 31 fixedly connected to the inner wall of the cylinder 26. A U-shaped frame 28 is fixedly connected to the end of the sliding column 27 located outside the cylinder 26. A rotating shaft 29 is rotatably connected to the U-shaped frame 28, and a pressing column 30 is fixedly connected to the rotating shaft 29, with the pressing column 30 adhering to the bottom of the upper filter frame 11. The first spring 31 is provided to assist in the reset of the sliding column 27.

[0068] An air cavity 19 is formed between the outer wall of the airbag 17 and the inner wall of the top box 16. An air pipe 32 is fixedly connected to the bottom of the top box 16 and communicates with the air cavity 19. The air pipe 32 extends into the interior of the filter box 8 and communicates with the cylinder 26.

[0069] During operation, when the airbag 17 expands, it compresses the air chamber 19, causing the gas inside the air chamber 19 to enter the interior of the cylinder 26 through the air pipe 32. After the gas enters the interior of the cylinder 26, the sliding column 27 extends outward from the interior of the cylinder 26, and the first spring 31 is stretched. The sliding column 27 drives the upper filter frame 11 to flip upward through the U-shaped frame 28 and the extrusion column 30, increasing the tilt angle of the upper filter frame 11, which facilitates the sliding of impurities attached to the upper filter frame 11 towards the lower filter frame 9.

[0070] When the airbag 17 contracts, the air chamber 19 expands. The air chamber 19 draws gas from inside the cylinder 26 through the air tube 32. With the assistance of the reset force of the first spring 31, the sliding column 27 drives the U-shaped frame 28 and the squeezing column 30 to reset, and the upper filter frame 11 flips downward.

[0071] The solenoid valve 21 is opened and closed repeatedly in the up and down steps, and the upper filter frame 11 swings up and down to create a shaking effect, which speeds up the sliding speed of impurities.

[0072] Furthermore, the increased speed of coolant spraying, combined with the oscillation of the upper filter frame 11, improves the cleaning effect.

[0073] Support plates 36 are fixedly connected to the inner walls of both sides of the airbag 17, and a second spring 37 is fixedly connected between the two support plates 36. The second spring 37 can improve the contraction effect of the airbag 17, thereby further increasing the speed of coolant spray. When the airbag 17 inflates, the second spring 37 stretches, and when the airbag 17 contracts, the restoring force of the second spring 37 can accelerate the contraction speed of the airbag 17.

[0074] To prevent impurities from falling from the end of the upper filter frame 11 away from the lower filter frame 9 and the inner wall of the filter box 8 into the cooling chamber 15, an elastic strip 14 is fixedly connected to the end of the upper filter frame 11 away from the lower filter frame 9. The end of the elastic strip 14 away from the upper filter frame 11 is fixedly connected to the inner wall of the filter box 8. The elastic strip 14 has a certain elasticity and does not affect the swing of the upper filter frame 11.

[0075] This invention also discloses a method for preparing tungsten carbide powder, including the above-mentioned tungsten carbide powder preparation system, and further comprising the following steps:

[0076] S1. Sintering: The raw materials are mixed and crushed into mixed powder, and the mixed powder is sintered.

[0077] S2. Cooling: After sintering, the cooling process is carried out in the cooling furnace 5 through a circulating cooling device. The upper filter frame 11 filters the impurities in the cooling liquid of the circulating cooling device, and the air bag 17 periodically expands to accelerate the speed of the cooling liquid spraying out, relying on the liquid flow to flush away the impurities on the upper filter frame 11.

[0078] S3. Grinding: Tungsten carbide is crushed to obtain tungsten carbide powder.

[0079] Working principle: In the initial stage of the use of the circulating cooling device, the cooling device 33 is started, and the cooling device 33 cools the coolant in the cooling chamber 15. Then, the solenoid valve 21 is opened, and the pump body 34 is started. The pump body 34 draws the cooled coolant in the cooling chamber 15 and delivers it to the spiral tube 7 through the third liquid pipe 35. The coolant flows inside the spiral tube 7 to cool the sintered tungsten carbide, maintain the ultra-fine grain size of the material, prevent oxidation and decarburization, improve product utilization and reduce preparation costs.

[0080] After the coolant flows out of the spiral tube 7, it flows into the airbag 17 through the first liquid pipe 18. At this time, the solenoid valve 21 is open, and the coolant enters the round tube 22 through the second liquid pipe 20 and flows out through the nozzle 25. Since the upper filter frame 11 is inclined, when the coolant falls on the upper filter frame 11, it will flow towards the lower filter frame 9 in the slide groove 12. During the flow, the coolant drips through the second filter hole 13 into the cooling chamber 15, and impurities slide down with the liquid flow to the accumulation area 38 and accumulate on the lower filter frame 9. The coolant that slides down to the accumulation area 38 with the impurities can drip through the first filter hole 10 into the cooling chamber 15, but a small amount of impurities will remain on the upper filter frame 11.

[0081] At the same time, the motor 24 drives the circular tube 22 to rotate through the circular block 23, adjusting the angle of the liquid flow sprayed from the nozzle 25, so as to avoid continuous scouring of the same position of the upper filter frame 11 and causing wear.

[0082] When there are many impurities remaining on the upper filter frame 11, the solenoid valve 21 is closed. After the coolant flows into the airbag 17 from the first liquid pipe 18, since the solenoid valve 21 is in the closed state at this time, the coolant accumulates inside the airbag 17 and causes the airbag 17 to expand. At the same time, with the cooperation of the support plate 36, the second spring 37 is stretched.

[0083] When the air bladder 17 expands, it compresses the air chamber 19, causing the gas inside the air chamber 19 to enter the interior of the cylinder 26 through the air pipe 32. After the gas enters the interior of the cylinder 26, the sliding column 27 extends outward from the interior of the cylinder 26. The sliding column 27 drives the upper filter frame 11 to flip upward through the U-shaped frame 28 and the extrusion column 30, increasing the tilt angle of the upper filter frame 11, which facilitates the sliding of impurities attached to the upper filter frame 11 towards the lower filter frame 9.

[0084] When the airbag 17 inflates to a certain extent, the solenoid valve 21 opens. Coolant enters the interior of the circular tube 22 through the second liquid pipe 20 and is sprayed onto the upper filter frame 11 through the nozzle 25. Under the action of the contraction elastic force of the airbag 17 and the restoring elastic force of the second spring 37, the speed at which the coolant is sprayed out from the nozzle 25 can be accelerated, flushing away impurities on the upper filter frame 11, achieving the effect of impurity cleaning, and the impurities slide down to the accumulation area 38.

[0085] When the airbag 17 contracts, the air chamber 19 expands, and the air chamber 19 draws gas from inside the cylinder 26 through the air tube 32, causing the sliding column 27 to drive the U-shaped frame 28 and the squeezing column 30 to reset, and the upper filter frame 11 to flip downward.

[0086] The solenoid valve 21 is opened and closed repeatedly in the up-and-down steps, and the upper filter frame 11 swings up and down to create a shaking effect. At the same time, the speed of coolant spraying is periodically increased, which further improves the effect of cleaning impurities.

[0087] After the impurities attached to the upper filter frame 11 are cleaned, the solenoid valve 21 can be opened and kept open, and the coolant flows inside the spiral tube 7 to cool the sintered tungsten carbide.

Claims

1. A system for the production of tungsten carbide powder comprising a mixing device (1), a conveying device (2), a sintering device (3) and a grinding device (6), characterized in that: The mixing device (1) is used for mixing and crushing raw materials into mixed powder, the conveying device (2) is used for conveying the mixed powder, the sintering device (3) comprises a sintering furnace (4) and a cooling furnace (5), the mixed powder sequentially passes through the sintering furnace (4) and the cooling furnace (5) to form tungsten carbide, and the grinding device (6) is used for crushing the tungsten carbide to obtain tungsten carbide powder; The cooling furnace (5) is externally provided with a circulating cooling device, the circulating cooling device comprises a spiral pipe (7) and a filter box (8), the spiral pipe (7) is arranged around the outside of the cooling furnace (5), and the filter box (8) is arranged outside the cooling furnace (5); cooling liquid circulates in the inside of the spiral pipe (7) and filters impurities in the inside of the filter box (8); and the inside of the filter box (8) is provided with an upper filter frame (11) for filtering impurities. The filter box (8) is externally provided with an air bag (17) in communication with the spiral pipe (7); the bottom end of the air bag (17) is communicated with a second liquid pipe (20); one end of the second liquid pipe (20) away from the air bag (17) extends to the inside of the filter box (8) and is communicated with a circular pipe (22); the circular pipe (22) is arranged above the upper filter frame (11); the circular pipe (22) is communicated with a nozzle (25); the second liquid pipe (20) is fixedly provided with an electromagnetic valve (21); when the electromagnetic valve (21) is closed, the cooling liquid is accumulated in the air bag (17) and makes the air bag (17) expand and become larger; when the electromagnetic valve (21) is opened, the contraction elastic force of the air bag (17) makes the cooling liquid sprayed from the nozzle (25) accelerate and wash away the impurities accumulated on the upper filter frame (11). The inside of the filter box (8) is fixedly connected with a lower filter frame (9); a plurality of first filter holes (10) are arranged through the lower filter frame (9); an accumulation area (38) is formed between the lower filter frame (9) and the inner wall of the filter box (8); the upper filter frame (11) is hingedly connected to the top of the lower filter frame (9); the lower filter frame (9) and the upper filter frame (11) are both arranged in an inclined manner; one end of the upper filter frame (11) close to the lower filter frame (9) is inclined downward; one end of the lower filter frame (9) away from the upper filter frame (11) is inclined downward; the upper surface of the upper filter frame (11) is provided with a plurality of sliding grooves (12) arranged in an evenly distributed manner; the bottom of each sliding groove (12) is provided with a plurality of second filter holes (13) arranged through the sliding groove (12). One end of the upper filter frame (11) away from the lower filter frame (9) is fixedly connected with an elastic strip (14); one end of the elastic strip (14) away from the upper filter frame (11) is fixedly connected to the inner wall of the filter box (8).

2. The system for producing tungsten carbide powder according to claim 1, wherein: The top end of the outer wall of the filter box (8) is fixedly connected with a top box (16); the air bag (17) is fixedly connected to the inside of the top box (16); the bottom of the top box (16) is provided with a circular groove through which the second liquid pipe (20) passes; the top of the air bag (17) is communicated with a first liquid pipe (18); one end of the first liquid pipe (18) away from the air bag (17) passes through the top box (16) and is communicated with the spiral pipe (7).

3. The system for producing tungsten carbide powder according to claim 2, wherein: The inner wall of the filter box (8) is fixedly connected with a cylinder (26), the inside of the cylinder (26) is slidably provided with a sliding column (27), one end of the sliding column (27) penetrates through the cylinder (26) and is away from the inner wall of the filter box (8), the inside of the cylinder (26) is provided with a first spring (31), one end of the first spring (31) is fixedly connected on the sliding column (27), the other end of the first spring (31) is fixedly connected on the inner wall of the cylinder (26), one end of the sliding column (27) located outside the cylinder (26) is fixedly connected with a U-shaped frame (28), the U-shaped frame (28) is rotatably connected with a rotating shaft (29), the rotating shaft (29) is fixedly connected with a pressing column (30), and the pressing column (30) is attached to the bottom of the upper filter frame (11).

4. The system for producing tungsten carbide powder according to claim 3, wherein: The outer wall of the air bag (17) and the inner wall of the top box (16) form an air cavity (19), the bottom of the top box (16) is fixedly connected with an air pipe (32), and the air pipe (32) is in communication with the air cavity (19), the air pipe (32) extends to the inside of the filter box (8) and is in communication with the cylinder (26).

5. The system for producing tungsten carbide powder according to claim 4, wherein: The two side inner walls of the air bag (17) are fixedly connected with a support plate (36), and the two support plates (36) are fixedly connected with a second spring (37).

6. The system for producing tungsten carbide powder according to claim 1, wherein: Both ends of the circular pipe (22) are fixedly connected with a circular block (23), one end of the circular block (23) away from the circular pipe (22) is rotatably connected on the side wall of the filter box (8), the outer wall of the filter box (8) is fixedly connected with a motor (24), and one of the circular blocks (23) is fixedly connected on the driving shaft of the motor (24).

7. The system for producing tungsten carbide powder according to claim 1, wherein: The bottom of the lower filter frame (9), the upper filter frame (11) and the filter box (8) form a cooling chamber (15), the inside of the cooling chamber (15) is provided with a cooling device (33), the outer wall of the filter box (8) is fixedly connected with a pump body (34), the liquid inlet end of the pump body (34) is in communication with the cooling chamber (15), the liquid outlet end of the pump body (34) is communicated with a third liquid pipe (35), and one end of the third liquid pipe (35) away from the pump body (34) is in communication with the spiral pipe (7).

8. A method of producing tungsten carbide powder, characterized by: The preparation system of the tungsten carbide powder comprises the following steps: S1, sintering, mixing, crushing the raw materials into mixed powder, and sintering the mixed powder; S2, cooling, after sintering, the cooling furnace (5) is cooled by the circulating cooling device, the upper filter frame (11) filters the impurities in the circulating cooling device, and the air bag (17) periodically expands to speed up the speed of the cooling liquid spray, and relies on the liquid flow to remove the impurities on the upper filter frame (11); S3, grinding, crushing the tungsten carbide to obtain tungsten carbide powder.

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