A hybrid dryer based on hard metal powder processing

Abstract

The present application relates to the technical field of metal powder processing, and specifically discloses a mixing dryer based on hard alloy powder processing, which comprises a first guide plate, a first sleeve is fixedly arranged at the top center of the first guide plate, a feed pipe and an air guide pipe are fixedly arranged on the side wall of the first sleeve, and the present application is characterized by the working principle of "mechanical pressure filtration-fast separation": under the normal temperature process environment, the hard alloy powder slurry after the wet grinding process is rapidly dried to realize the efficient solid-liquid separation under the cold pressure condition, so that the drying of the hard alloy powder is realized, and the solvent recovery of the hard alloy powder slurry is simultaneously completed, which is convenient for the subsequent processing and use of the hard alloy powder, compared with the traditional drying equipment adopting the principles of hot air conduction and radiation heating, the present application has smaller limitation on the types of forming agents and wet grinding media, shorter drying period and lower energy consumption. In addition, heating is not required, the generation of organic solvent volatiles is reduced, and the safety hidden danger is reduced.

Description

Technical Field

[0001] This invention relates to the field of metal powder processing technology, specifically to a mixing dryer based on cemented carbide powder processing. Background Technology

[0002] As a crucial step in powder metallurgy, the drying quality of specialized drying equipment in the cemented carbide industry directly affects the density and mechanical properties of alloy products. Currently, the industry commonly employs two mainstream processes: vacuum drying and spray granulation drying. With the development of cemented carbide towards higher precision and ultrafine grains, developing new drying systems with precise temperature control, low oxygen content, and high energy efficiency has become an important technological breakthrough for improving the performance indicators of cemented carbide products.

[0003] Based on existing technologies, the following problems exist: Traditional cemented carbide powder processing mixing and drying equipment employs thermal drying principles such as hot air conduction and radiation heating. These devices not only have strict limitations on the types of forming agents (e.g., requiring the use of polyethylene glycol with specific molecular weights) and wet grinding media (e.g., alcohol only), but also have drying cycles lasting 8–24 hours, resulting in high energy consumption. More seriously, the heating process generates a large amount of volatile organic solvents, posing significant safety hazards and exhibiting certain shortcomings. To address these issues, a mixing dryer based on cemented carbide powder processing is proposed. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a mixing dryer based on cemented carbide powder processing, comprising a base, a guide rod fixedly disposed at the top corner of the base, and a top seat fixedly sleeved on the upper end of the side wall of the guide rod, and further comprising: The first guide plate is sleeved on the side wall of the guide rod. The first sleeve is fixedly sleeved at the top center of the first guide plate. The feed pipe and the air guide pipe are fixedly installed on the side wall of the first sleeve. The pressure head is fitted onto the inner wall of the first sleeve, and the side wall of the pressure head and the inner wall of the first sleeve are designed to be dynamically sealed. The second sleeve is fixedly sleeved at the top center of the base and is coaxial with the first sleeve. The inner wall of the second sleeve and the outer wall of the first sleeve are dynamically sealed. A filter disc is fixedly fitted onto the inner wall of the second sleeve to block the cemented carbide powder, thereby draining the slurry from the cemented carbide powder and drying the powder. The top of the chassis is equipped with a transfer mechanism for removing the cake-shaped cemented carbide powder after the slurry has been drained. The inner wall of the second sleeve is equipped with an auxiliary mechanism for assisting in the drying of the cemented carbide powder.

[0005] Furthermore, the auxiliary mechanism includes: The piston block is fitted onto the inner wall of the second sleeve and has a dynamic sealing design with the inner wall of the second sleeve. The flow channel is located at the top center of the piston block. The inner wall of the flow channel is inclined, and the inclination angle increases from the outside of the piston block to the center.

[0006] Furthermore, the auxiliary mechanism also includes: A flow guide hole is opened at the bottom of the piston block and communicates with the flow guide groove. A plug rod is sleeved on the inner wall of the flow guide hole. The bypass grooves are arranged in a ring array at the lower end of the inner wall of the guide hole and extend to the bottom of the piston block. The side wall of the plug rod and the upper end of the inner wall of the guide hole are designed to be dynamically sealed so that the plug rod can block the slurry when it is at the top of the bypass groove, and the slurry can flow along the guide hole and the bypass groove to the bottom of the piston block when the plug rod is in the bypass groove.

[0007] Furthermore, the auxiliary mechanism also includes: The retaining ring is fixedly sleeved on the side wall of the plug rod and located at the bottom of the piston block; A stop is fixedly mounted on the bottom of the piston block and sleeved on the side wall of the plug rod. The side wall of the stop has a first guide groove arranged in a ring array. A spring is sleeved on the side wall of the plug rod between the bottom of the inner side of the stop and the bottom of the stop ring.

[0008] Furthermore, the auxiliary mechanism also includes: The fixed frame is fixedly installed at the bottom of the piston block and located outside the stop. The side wall of the fixed frame is provided with a second guide groove arranged in a ring array. The first hydraulic rod is fixedly mounted on the inner wall of the second sleeve. The output shaft of the first hydraulic rod is fixedly connected to the bottom of the fixed frame to drive the piston block to move vertically.

[0009] Furthermore, the auxiliary mechanism also includes: The guide plate is fixedly provided with the inner wall of the second sleeve and fixedly sleeved on the side wall of the first hydraulic rod to fix the first hydraulic rod. The guide plate is designed with an inclination to guide the flow of slurry. The discharge pipe is fixedly installed on the outer wall of the second sleeve and extends into the second sleeve. The end of the discharge pipe inside the second sleeve is located at the lowest point of the inclined section of the guide plate. A limiting component is sleeved on the side wall of the telescopic shaft of the first hydraulic rod, and the end of the limiting component away from the first hydraulic rod is fixedly connected to the inner wall of the second sleeve.

[0010] Furthermore, a second hydraulic rod is fixedly provided on both sides of the top of the top seat, and the telescopic shaft of the second hydraulic rod is fixedly connected to the top of the first guide plate to drive the first guide plate and the first sleeve to rise and fall. The feed pipe and the air guide pipe are located on both sides of the outer wall of the first sleeve, respectively, to convey hard alloy powder slurry and drying gas into the first sleeve.

[0011] Furthermore, a third hydraulic rod is fixedly provided at the top center of the top seat. The telescopic shaft of the third hydraulic rod is fixedly connected to the top of the pressure head to drive the pressure head to rise and fall along the inner wall of the first sleeve. The side wall diameter of the telescopic shaft of the third hydraulic rod is smaller than the side wall diameter of the pressure head. A second guide plate is fitted onto the side wall of the guide rod and on top of the first guide plate. The center of the second guide plate is fixedly fitted onto the side wall of the telescopic shaft of the third hydraulic rod.

[0012] Furthermore, the transfer mechanism includes: The mounting bases are fixedly installed on the top of the base and arranged symmetrically with respect to the center point of the base. Electric slide rails are fixedly installed on the inner side of both mounting bases, and transfer plates are fixedly installed on the sliding end of the electric slide rails.

[0013] Furthermore, after the first sleeve moves into the second sleeve and abuts against the top of the filter disc, the first guide plate is positioned above the mounting base. The two mounting bases are located on both sides of the second sleeve, so that the transfer plate can be moved to the top of the second sleeve without affecting the entry of the first sleeve into the second sleeve.

[0014] This invention provides a mixing dryer based on cemented carbide powder processing. Compared with the prior art, it has the following advantages: 1. This invention utilizes the working principle of "mechanical pressure filtration - rapid separation" to rapidly dry the cemented carbide powder slurry after wet grinding under normal temperature process conditions, achieving efficient solid-liquid separation under cold pressing conditions to dry the cemented carbide powder. Simultaneously, the solvent of the cemented carbide powder slurry is recovered, facilitating the subsequent processing and use of the cemented carbide powder. Compared to traditional drying equipment that uses hot air conduction or radiant heating, this invention has fewer restrictions on the type of molding agent and the wet grinding medium, and it also has a shorter drying cycle and lower energy consumption. Furthermore, it eliminates the need for heating, reducing the generation of volatile organic solvents and lowering safety hazards.

[0015] 2. In this invention, compressed drying gas flows downward along the gaps between cemented carbide powders. In addition to the mechanical pressure of the pressure head, the compressed drying gas can also be superimposed with the pressure difference driving force of gas phase mass transfer, which can accelerate the discharge speed of liquids such as slurry in cemented carbide powder slurry through the filter plate and shorten the drying cycle. The penetration of drying gas allows for more uniform drainage of liquid inside the cemented carbide powder slurry, reducing localized liquid accumulation and thus improving drying efficiency. Drying gas can quickly remove moisture from the pores inside the cemented carbide powder slurry, reducing the amount of moisture retained in the pores of the cemented carbide powder, thereby reducing the amount of residual moisture in the cemented carbide powder after drying and improving the efficiency of cold pressing and drying of cemented carbide powder.

[0016] 3. This invention uses negative pressure to extract slurry from the bottom of the filter disc, increasing the speed at which slurry is discharged from the cemented carbide powder slurry and facilitating the extraction of slurry and moisture remaining deep within the cemented carbide powder, thereby improving the dryness of the cemented carbide powder. In addition, in conjunction with the pressure head, the downward pressure and suction methods work together to improve the drying efficiency of the cemented carbide powder.

[0017] 4. This invention, during the discharge of slurry, traps the dry gas that passes through the hard alloy powder and enters the space between the piston block and the filter plate. This traps the dry gas between the filter plate and the piston block, causing it to backwash the filter plate. This backwashes the hard alloy powder stuck or remaining in the filter plate's pores, preventing some of the hard alloy powder from clogging the filter plate's pores and affecting its subsequent use. This facilitates long-term drying and use of the hard alloy powder without affecting the recovery of slurry and other liquids. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a longitudinal sectional view of the second guide plate and the first guide plate of the present invention; Figure 3 This is a longitudinal sectional view of the base and the first guide plate of the present invention; Figure 4 This is a schematic diagram of the transfer mechanism structure of the present invention; Figure 5 This is a schematic diagram of the auxiliary mechanism structure of the present invention; Figure 6 For the present invention Figure 5 A magnified structural diagram of A in the middle; Figure 7 This is a schematic diagram of the third hydraulic rod and pressure head structure of the present invention; Figure 8 For the present invention Figure 7 A magnified structural diagram of B in the diagram; Figure 9 This is a schematic diagram of the third hydraulic rod, feed pipe, air guide pipe, pressure head, and first sleeve structure of the present invention; Figure 10 This is a schematic diagram of the structure of the second hydraulic rod, the second sleeve, and the first guide plate of the present invention; Figure 11 This is a schematic diagram of the longitudinal cross-sectional structure of the second sleeve of the present invention; Figure 12This is a schematic diagram of the guide plate and discharge pipe structure of the present invention; Figure 13 This is a schematic diagram of the first hydraulic rod, the fixing frame, and the piston block structure of the present invention; Figure 14 This is a longitudinal sectional view of the piston block, fixing bracket, and stop bracket of the present invention. Figure 15 This is a schematic diagram of the structure of the fixing frame, the baffle, the first guide channel, the second guide channel, the guide hole and the bypass channel of the present invention.

[0019] The reference numerals in the above figures are as follows: 1. Base; 2. Guide rod; 3. Top seat; 4. Second guide plate; 5. First guide plate; 6. Third hydraulic rod; 7. Second hydraulic rod; 8. Auxiliary mechanism; 9. Transfer mechanism; 10. First sleeve; 11. Pressure head; 12. Air guide pipe; 13. Feed pipe; 81. Second sleeve; 82. Discharge pipe; 83. Filter plate; 84. Piston block; 85. Limiting component; 86. First hydraulic rod; 87. Guide plate; 88. Fixing frame; 89. Guide groove; 891. Guide hole; 892. Blocking rod; 893. Baffle; 894. Baffle ring; 895. Bypass groove; 896. First guide groove; 897. Second guide groove; 91. Mounting base; 92. Electric slide rail; 93. Transfer plate. Detailed Implementation

[0020] 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.

[0021] Example 1, please refer to Figures 1-3 , Figures 5-10 A mixing dryer based on cemented carbide powder processing includes a base 1, a guide rod 2 fixedly disposed at the top corner of the base 1, and a top seat 3 fixedly sleeved on the upper end of the side wall of the guide rod 2, and further includes: The first guide plate 5 is sleeved on the side wall of the guide rod 2. The first sleeve 10 is fixedly sleeved at the top center of the first guide plate 5. The feed pipe 13 and the air pipe 12 are fixedly installed on the side wall of the first sleeve 10. The pressure head 11 is sleeved on the inner wall of the first sleeve 10, and the side wall of the pressure head 11 and the inner wall of the first sleeve 10 are designed to be dynamically sealed. The second sleeve 81 is fixedly sleeved at the top center of the base 1 and is coaxial with the first sleeve 10. The inner wall of the second sleeve 81 and the outer wall of the first sleeve 10 are dynamically sealed. The filter disc 83 is fixedly sleeved on the inner wall of the second sleeve 81 to block the cemented carbide powder, thereby draining the slurry from the cemented carbide powder and drying the cemented carbide powder. The top of the chassis is provided with a transfer mechanism 9 for removing the cake-shaped cemented carbide powder after the slurry is drained. The inner wall of the second sleeve 81 is provided with an auxiliary mechanism 8 for assisting in the drying of cemented carbide powder.

[0022] In practice, the first guide plate 5 and the first sleeve 10 are driven downward by the second hydraulic rod 7, causing the first sleeve 10 to move into the second sleeve 81 and press against the top of the filter disc 83. During this process, the pressure head 11 remains inside the first sleeve 10, thereby creating a space for storing the hard alloy powder slurry between the first sleeve 10, the pressure head 11, and the filter disc 83, and ensuring that the slurry in the hard alloy powder slurry can only flow downward from the top of the filter disc 83.

[0023] After the bottom of the first sleeve 10 is pressed against the top of the filter disc 83, the cemented carbide powder slurry is fed into the first sleeve 10 through the external pipeline of the feed pipe 13. After the specified volume of cemented carbide powder slurry is fed, the feed pipe 13 is closed. Then, the third hydraulic rod 6 is activated, which drives the pressure head 11 to move downward along the inner wall of the first sleeve 10, thereby squeezing the cemented carbide powder slurry. This causes the slurry water in the cemented carbide powder slurry to flow rapidly downward along the filter disc 83 and be discharged through the discharge pipe 82. The cemented carbide powder in the cemented carbide powder slurry is blocked at the top of the filter disc 83, thereby drying the cemented carbide powder. The powder slurry drying and solvent recovery are completed simultaneously through cold pressing, so that the cemented carbide powder can be used in actual processing. After being extruded, the cemented carbide powder slurry is formed into a cake shape. During the extrusion process, the friction between the cemented carbide powder and the first sleeve 10 continuously increases. When the first sleeve 10 and the pressure head 11 move upward and reset, the cemented carbide powder moves upward with the first sleeve 10. Then, the electric slide rail 92 drives the transfer plate 93 to move to the top of the second sleeve 81. Then, the second hydraulic rod 7 drives the first sleeve 10 to move upward. At this time, the pressure head 11 moves downward or remains stationary, so that the cemented carbide powder, which has been pressed into a cake shape, falls onto the transfer plate 93, transferring the dried cemented carbide powder to the next processing station for subsequent processing and use. Through the working principle of "mechanical pressure filtration - rapid separation", the cemented carbide powder slurry that has undergone wet grinding is rapidly dried under normal temperature process conditions, achieving efficient solid-liquid separation under cold pressing conditions to dry the cemented carbide powder. At the same time, the solvent of the cemented carbide powder slurry is recovered, facilitating the subsequent processing and use of the cemented carbide powder. Compared to traditional drying equipment that uses hot air conduction or radiant heating, this invention has fewer restrictions on the type of molding agent and the wet grinding medium, and it also has a shorter drying cycle and lower energy consumption. Furthermore, it eliminates the need for heating, reducing the generation of volatile organic solvents and lowering safety hazards.

[0024] To further improve the drying effect of cemented carbide powder, after the cemented carbide powder slurry is fed into the first sleeve 10 through the feed pipe 13, the feed pipe 13 is closed and the air guide pipe 12 is opened. After connecting the drying gas pipeline to the outside of the air guide pipe 12, the drying gas is transported along the air guide pipe 12 into the first sleeve 10, and is located at the top of the cemented carbide powder slurry. After the drying gas at the specified pressure is transported, the air guide pipe 12 is closed. Then, the pressure head 11 is driven to move downward by the second hydraulic rod 7. Since the pressure head 11 and the first sleeve 10 have a dynamic seal design, during the downward movement of the pressure head 11, while squeezing the drying gas and the cemented carbide powder slurry, the compressed drying gas flows downward along the gaps between the cemented carbide powders. The filled compressed drying gas can be superimposed with the pressure difference driving force of gas phase mass transfer in addition to the mechanical pressure of the pressure head 11, which accelerates the discharge speed of liquid such as slurry in the cemented carbide powder slurry through the filter plate 83 and shortens the drying cycle. Furthermore, the penetration of drying gas allows for more uniform liquid discharge from the cemented carbide powder slurry, reducing localized liquid accumulation and thus improving drying efficiency. In addition, the drying gas can quickly remove moisture from the pores inside the cemented carbide powder slurry, reducing moisture retention within the pores and thus reducing the amount of residual moisture in the cemented carbide powder after drying. This improves the efficiency of cold-pressing drying of cemented carbide powder, facilitates subsequent processing and use of the cemented carbide powder, and saves costs compared to the traditional method of drying with heated gas.

[0025] During the process of pressing the cemented carbide powder slurry by driving the pressure head 11 downward through the third hydraulic rod 6, the first hydraulic rod 86 is activated, causing the fixed frame 88 and piston block 84 to move downward. Since the piston block 84 and the inner wall of the second sleeve 81 are dynamically sealed, the cemented carbide powder slurry is stored at the top of the filter plate 83, and the cemented carbide powder is blocked at the top of the filter plate 83. Thus, the slurry water in the cemented carbide powder is extracted from the bottom of the filter plate 83 by negative pressure, which increases the speed of slurry water discharge from the cemented carbide powder slurry and facilitates the extraction of slurry water and moisture remaining deep in the cemented carbide powder, thereby improving the dryness of the cemented carbide powder. In addition, in conjunction with the pressure head 11, the downward pressing and suction methods work together to improve the drying efficiency of the cemented carbide powder.

[0026] The slurry and other liquids discharged after extrusion flow downwards along the filter plate 83 to the top of the piston block 84. When the slurry at the top of the piston block 84 accumulates to a certain volume, the extrusion plug rod 892 overcomes the spring force and moves downwards along the guide hole 891, thereby positioning the plug rod 892 in the bypass hole. This allows the slurry at the top of the piston block 84 to flow downwards along the guide groove 89, guide hole 891, and bypass groove 895, and flow to the top of the guide plate 87, where it is discharged through the discharge pipe 82. This facilitates the centralized collection and treatment of the cold-pressed slurry and other liquids, thereby achieving the drying of cemented carbide powder and enabling the recovery of the cold-pressed slurry, which is convenient for subsequent processing of cemented carbide powder.

[0027] During the discharge of slurry along the guide hole 891 to the bottom of the piston block 84, since the density of the slurry is much greater than that of the drying gas, the slurry at the bottom layer is discharged first through the guide hole 891. The drying gas that passes through the cemented carbide powder and enters the space between the piston block 84 and the filter plate 83 is retained. As the pressure head 11 continues to squeeze, more and more drying gas is retained between the filter plate 83 and the piston block 84. When the cemented carbide powder is squeezed to the specified pressure and the drying of the cemented carbide powder is completed, during the upward movement of the first sleeve 10, the pressure head 11, and the cake-shaped cemented carbide powder, the piston block 84 is driven upward by the first hydraulic rod 86. The drying gas retained between the filter plate 83 and the piston block 84 backflushes the filter plate 83, thereby backflushing the cemented carbide powder stuck or remaining in the filter holes of the filter plate 83. This prevents some cemented carbide powder from clogging the filter holes of the filter plate 83 and affecting the next use, thus facilitating long-term drying and use of the cemented carbide powder without affecting the recovery of slurry and other liquids.

[0028] During the extrusion of cemented carbide powder, as the cemented carbide powder is continuously extruded, the gaps between the cemented carbide powders become smaller and smaller, and the cemented carbide powders become more and more compact. As a result, the dry gas remaining on the top of the cake-shaped cemented carbide powder cannot completely diffuse to the bottom of the cake-shaped cemented carbide powder. This part of the residual dry gas leaks out after the cake-shaped cemented carbide powder is placed on the transfer plate 93, without affecting the next feeding and the use of dry gas at the specified pressure.

[0029] The pressure of the drying gas supplied to the top of the cemented carbide powder slurry is selected according to the required extrusion strength of the cemented carbide powder slurry and the type of cemented carbide powder. The pressure of the drying gas can be determined by an external pressure gauge or the like. Those skilled in the art can design it according to the actual situation, and no limitation is made here.

[0030] The top of the top seat 3 is fixedly provided with a second hydraulic rod 7 on both sides. The telescopic shaft of the second hydraulic rod 7 is fixedly connected to the top of the first guide plate 5 to drive the first guide plate 5 and the first sleeve 10 to rise and fall. The feed pipe 13 and the air guide pipe 12 are located on both sides of the outer wall of the first sleeve 10, respectively, to convey hard alloy powder slurry and drying gas into the first sleeve 10.

[0031] In specific implementation, the first guide plate 5 is driven to rise and fall along the side wall of the four guide rods 2 by the second hydraulic rod 7. The first guide plate 5 drives the first sleeve 10, the feed pipe 13 and the air pipe 12 to rise and fall, so that the first sleeve 10 extends into the second sleeve 81, or is lifted away from the second sleeve 81.

[0032] The guide rod 2 limits the lifting and lowering of the first guide plate 5, allowing the first sleeve 10 to stably enter the first sleeve 10 and press against the top of the filter disc 83. The feed pipe 13 and the air guide pipe 12 can be connected to external pipelines via flexible hoses to avoid affecting the conveying of hard alloy powder slurry and drying gas during the lifting and lowering of the feed pipe 13 and the air guide pipe 12.

[0033] A third hydraulic rod 6 is fixedly provided at the top center of the top seat 3. The telescopic shaft of the third hydraulic rod 6 is fixedly connected to the top of the pressure head 11 to drive the pressure head 11 to rise and fall along the inner wall of the first sleeve 10. The side wall diameter of the telescopic shaft of the third hydraulic rod 6 is smaller than the side wall diameter of the pressure head 11. A second guide plate 4 is fitted on the side wall of the guide rod 2 and on top of the first guide plate 5. The center of the second guide plate 4 is fixedly fitted on the side wall of the telescopic shaft of the third hydraulic rod 6.

[0034] In practice, the third hydraulic rod 6 drives the pressure head 11 to rise and fall along the inner wall of the first sleeve 10. When the pressure head 11 descends, it squeezes the cemented carbide powder slurry, thereby expelling liquids such as slurry water from the cemented carbide powder slurry to dry the cemented carbide powder. When the pressure head 11 rises, it resets its position relative to the first sleeve 10, thus facilitating the feeding pipe 13 to deliver the cemented carbide powder slurry into the first sleeve 10 and facilitating the subsequent delivery of drying gas into the first sleeve 10.

[0035] The pressure head 11 is located at the top of the feed pipe 13 and the air inlet pipe after being reset, so as not to affect the delivery of hard alloy powder slurry and drying gas into the first sleeve 10.

[0036] When the telescopic shaft of the third hydraulic rod 6 drives the pressure head 11 to rise and fall, it simultaneously drives the second guide rod 2 to rise and fall along the side wall of the guide rod 2. Thus, the guide rod 2 limits the rise and fall of the second guide plate 4 and the pressure head 11, improving the stability of the rise and fall of the pressure head 11.

[0037] The side wall diameter of the telescopic shaft of the third hydraulic rod 6 is smaller than that of the side wall diameter of the pressure head 11. This prevents the pressure head 11 from pressing down on the hard alloy powder slurry inside the first sleeve 10, thus avoiding obstruction of movement.

[0038] Please see Figure 3 and Figure 4 Transfer agency 9 includes: Mounting base 91 is fixedly mounted on the top of base 1 and arranged symmetrically with respect to the center point of base 1. Electric slide rails 92 are fixedly mounted on the inner side of both mounting bases 91, and transfer plates 93 are fixedly mounted on the sliding end of the electric slide rails 92.

[0039] In practice, after the cemented carbide powder slurry is extruded, it is pressed into a cake shape. During the extrusion process, the friction between the cemented carbide powder and the first sleeve 10 increases continuously. When the first sleeve 10 and the pressure head 11 move upward and reset, the cemented carbide powder moves upward with the first sleeve 10. Then, the transfer plate 93 is moved to the top of the second sleeve 81 by the electric slide rail 92. Then, the first sleeve 10 is moved upward by the second hydraulic rod 7. At this time, the pressure head 11 moves downward or remains stationary, so that the cemented carbide powder pressed into a cake shape falls onto the transfer plate 93, so as to transfer the dried cemented carbide powder to the next processing station for subsequent processing and use.

[0040] After the first sleeve 10 moves into the second sleeve 81 and abuts against the top of the filter disc 83, the first guide plate 5 is positioned above the mounting base 91 to avoid obstruction of movement between the first guide plate 5 and the mounting base 91, which would prevent the first guide plate 5 from being supported by the mounting plate and thus prevent the top of the bottom filter disc 83 of the first sleeve 10 from abutting against the top. Two mounting bases 91 are located on both sides of the second sleeve 81, so that the transfer plate 93 can be moved to the top of the second sleeve 81 without affecting the first sleeve 10 entering the second sleeve 81.

[0041] Example 2, please refer to Figures 11-15 The technical difference between this embodiment and Embodiment 1 lies in that the auxiliary mechanism 8 includes: Piston block 84 is sleeved on the inner wall of the second sleeve 81 and has a dynamic sealing design with the inner wall of the second sleeve 81. The flow channel 89 is located at the top center of the piston block 84. The inner wall of the flow channel 89 is inclined, and the inclination angle increases from the outside of the piston block 84 to the center.

[0042] Auxiliary mechanism 8 also includes: A flow guide hole 891 is opened at the bottom of the piston block 84 and communicates with the flow guide groove 89. A plug rod 892 is sleeved on the inner wall of the flow guide hole 891. The bypass groove 895 is arranged in a ring array at the lower end of the inner wall of the guide hole 891 and extends to the bottom of the piston block 84. The side wall of the plug rod 892 and the upper end of the inner wall of the guide hole 891 are designed to be dynamically sealed so that the plug rod 892 blocks the slurry when it is at the top of the bypass groove 895, and the slurry can flow along the guide hole 891 and the bypass groove 895 to the bottom of the piston block 84 when the plug rod 892 is in the bypass groove 895.

[0043] Auxiliary mechanism 8 also includes: The retaining ring 894 is fixedly sleeved on the side wall of the plug rod 892 and located at the bottom of the piston block 84; The stop bracket 893 is fixedly installed at the bottom of the piston block 84 and sleeved on the side wall of the plug rod 892. The side wall of the stop bracket 893 has a first guide groove 896 arranged in a ring array. A spring is sleeved on the side wall of the plug rod 892 between the bottom of the inner side of the stop bracket 893 and the bottom of the stop ring 894.

[0044] Auxiliary mechanism 8 also includes: The fixing bracket 88 is fixedly installed at the bottom of the piston block 84 and located outside the stop 893. The side wall of the fixing bracket 88 is provided with a second guide groove 897 arranged in a ring array. The first hydraulic rod 86 is fixedly mounted on the inner wall of the second sleeve 81. The output shaft of the first hydraulic rod 86 is fixedly connected to the bottom of the fixed frame 88 to drive the piston block 84 to move vertically.

[0045] Auxiliary mechanism 8 also includes: The guide plate 87 is fixedly provided with the inner wall of the second sleeve 81 and fixedly sleeved on the side wall of the first hydraulic rod 86 to fix the first hydraulic rod 86. The guide plate 87 is inclined to guide the flow of slurry. The discharge pipe 82 is fixedly installed on the outer wall of the second sleeve 81 and extends into the second sleeve 81. One end of the discharge pipe 82 located inside the second sleeve 81 is located at the lowest point of the inclined section of the guide plate 87. The limiting member 85 is sleeved on the side wall of the telescopic shaft of the first hydraulic rod 86, and the end of the limiting member 85 away from the first hydraulic rod 86 is fixedly connected to the inner wall of the second sleeve 81.

[0046] In practical implementation, when the cemented carbide powder slurry is pressed down by the pressure head 11, the first hydraulic rod 86 is activated. The first hydraulic rod 86 drives the fixed frame 88 and the piston block 84 to move downward. Because the side wall of the piston block 84 and the inner wall of the second sleeve 81 are dynamically sealed, and the second sleeve 81 is tightly pressed against the first sleeve 10, external gas cannot enter the space between the first sleeve 10, the second sleeve 81, the pressure head 11, and the piston block 84. As the piston block 84 moves downward, it draws suction from the space at the top of the piston block 84, creating a negative pressure environment between the bottom of the cemented carbide powder and the piston block 84. This helps to draw out the moisture from the cemented carbide powder slurry. As the downward distance of the piston block 84 increases, the negative pressure value of the negative pressure environment between the piston block 84 and the cemented carbide powder increases, improving the drying effect of the cemented carbide powder. In addition, the suction also facilitates the passage of drying gas through the gaps between the cemented carbide powder slurry, thereby facilitating the removal of moisture from the cemented carbide powder slurry and further improving the drying effect of the cemented carbide powder.

[0047] During the downward suction process of piston block 84, the slurry in the cemented carbide powder slurry flows through filter plate 83 to the top of piston block 84 and stagnates at the top of piston block 84. The drying gas also stagnates at the top of piston block 84 along with the slurry and other liquids. Since the density of the slurry is much greater than that of the drying gas, the slurry is located below the drying gas. When the slurry at the top of piston block 84 accumulates to a certain volume, it squeezes the plug rod 892 to overcome the spring force and move downward along the guide hole 891, so that the plug rod 892 is located in the bypass hole. This allows the slurry at the top of piston block 84 to flow downward along the guide groove 89, guide hole 891 and bypass groove 895, and flow to the top of guide plate 87. Since guide plate 87 is designed with an inclination, the slurry at the top of guide plate 87 can be discharged through discharge pipe 82, which facilitates the centralized collection and treatment of cold-pressed slurry and other liquids, thereby achieving cemented carbide powder drying and enabling the recovery of cold-pressed slurry, which is convenient for subsequent processing of cemented carbide powder. In addition, it can discharge the slurry at the top of the piston block 84 while blocking the drying gas at the top of the piston block 84. After the drying of the cemented carbide powder is completed, during the upward movement of the first sleeve 10, the pressure head 11 and the cake-shaped cemented carbide powder, the piston block 84 is driven upward by the first hydraulic rod 86. The drying gas trapped between the filter plate 83 and the piston block 84 backwashes the filter plate 83, thereby backwashing the cemented carbide powder stuck or remaining in the filter holes of the filter plate 83. This prevents some cemented carbide powder from clogging the filter holes of the filter plate 83 and affecting the next use, thus facilitating long-term drying and use of cemented carbide powder without affecting the recovery of slurry and other liquids.

[0048] The plug rod 892 moves vertically within the guide hole 891. Through the design of the bypass groove 895, when the plug rod 892 is at the top of the bypass groove 895, the side wall of the plug rod 892 and the inner wall of the guide hole 891 are in a dynamic sealing state to prevent the slurry and other liquids at the top of the piston block 84 from flowing downward. When the plug rod 892 is squeezed into the bypass groove 895 by the slurry, the slurry enters the bypass groove 895 along the guide hole 891 and the top of the plug rod 892. Since the bypass groove 895 extends to the bottom of the piston block 84, the slurry flows to the bottom of the piston block 84.

[0049] The lower end of the plug rod 892 is limited by the baffle 893, thereby limiting the plug rod 892 from both ends of the side wall through the guide hole 891 and the baffle 893, ensuring the space for the plug rod 892 to move vertically. The baffle ring 894 moves up and down along the inner side wall of the baffle 893 with the plug rod 892, preventing the plug rod 892 from disengaging from the baffle 893 and the guide hole 891. Under the action of the spring, the plug rod 892 has an upward tendency to move, so as to block the guide hole 891 after the liquid such as slurry on the top of the piston block 84 is discharged.

[0050] The first guide groove 896 and the second guide groove 897 on the side walls of the baffle 893 and the fixed frame 88 facilitate the downward flow of liquids such as slurry discharged from the bottom of the piston block 84 to the top of the guide plate 87. The fixed frame 88 also facilitates the lifting and lowering of the piston block 84 by the first hydraulic rod 86, making operation convenient. The limiting member 85 limits the telescopic shaft of the first hydraulic rod 86, improving its lifting and lowering stability without affecting the flow of liquids such as slurry.

[0051] The hydraulic devices, such as the first hydraulic rod 86 and the second hydraulic rod 7, in this invention are all connected to an external hydraulic system for practical control and use. This is prior art and will not be described in detail here.

[0052] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mixing and drying machine based on cemented carbide powder processing, comprising a base, a guide rod fixedly disposed at the top corner of the base, and a top seat fixedly sleeved on the upper end of the side wall of the guide rod, characterized in that, Also includes: The first guide plate is sleeved on the side wall of the guide rod. The first sleeve is fixedly sleeved at the top center of the first guide plate. The feed pipe and the air guide pipe are fixedly installed on the side wall of the first sleeve. The pressure head is fitted onto the inner wall of the first sleeve, and the side wall of the pressure head and the inner wall of the first sleeve are designed to be dynamically sealed. The second sleeve is fixedly sleeved at the top center of the base and is coaxial with the first sleeve. The inner wall of the second sleeve and the outer wall of the first sleeve are dynamically sealed. A filter disc, fixedly sleeved on the inner wall of the second sleeve, is used to block the cemented carbide powder, thereby draining the slurry from the cemented carbide powder for drying. The top of the base is equipped with a transfer mechanism for removing the cake-shaped cemented carbide powder after the slurry has been drained. The inner wall of the second sleeve is equipped with an auxiliary mechanism to assist in the drying of the cemented carbide powder. The auxiliary mechanism includes: The piston block is fitted onto the inner wall of the second sleeve and has a dynamic sealing design with the inner wall of the second sleeve. The flow channel is located at the top center of the piston block. The inner wall of the flow channel is inclined, and the inclination angle increases from the outside of the piston block to the center. A flow guide hole is opened at the bottom of the piston block and communicates with the flow guide groove. A plug rod is sleeved on the inner wall of the flow guide hole. The bypass grooves are arranged in a ring array at the lower end of the inner wall of the guide hole and extend to the bottom of the piston block. The side wall of the plug rod and the upper end of the inner wall of the guide hole are designed to be dynamically sealed so that the plug rod can block the slurry when it is at the top of the bypass groove, and the slurry can flow along the guide hole and the bypass groove to the bottom of the piston block when the plug rod is in the bypass groove.

2. The mixing dryer based on cemented carbide powder processing according to claim 1, characterized in that, The auxiliary mechanism also includes: The retaining ring is fixedly sleeved on the side wall of the plug rod and located at the bottom of the piston block; A stop is fixedly mounted on the bottom of the piston block and sleeved on the side wall of the plug rod. The side wall of the stop has a first guide groove arranged in a ring array. A spring is sleeved on the side wall of the plug rod between the bottom of the inner side of the stop and the bottom of the stop ring.

3. A mixing dryer based on cemented carbide powder processing according to claim 1, characterized in that, The auxiliary mechanism also includes: The fixed bracket is fixedly installed at the bottom of the piston block and located outside the stop. The side wall of the fixed bracket is provided with a second guide groove arranged in a ring array. The first hydraulic rod is fixedly mounted on the inner wall of the second sleeve. The output shaft of the first hydraulic rod is fixedly connected to the bottom of the fixed frame to drive the piston block to move vertically.

4. A mixing dryer based on cemented carbide powder processing according to claim 3, characterized in that, The auxiliary mechanism also includes: The guide plate is fixedly provided with the inner wall of the second sleeve and fixedly sleeved on the side wall of the first hydraulic rod to fix the first hydraulic rod. The guide plate is designed with an inclination to guide the flow of slurry. The discharge pipe is fixedly installed on the outer wall of the second sleeve and extends into the second sleeve. The end of the discharge pipe inside the second sleeve is located at the lowest point of the inclined section of the guide plate. A limiting component is sleeved on the side wall of the telescopic shaft of the first hydraulic rod, and the end of the limiting component away from the first hydraulic rod is fixedly connected to the inner wall of the second sleeve.

5. A mixing dryer based on cemented carbide powder processing according to claim 1, characterized in that, The top of the top seat is fixedly provided with a second hydraulic rod on both sides. The telescopic shaft of the second hydraulic rod is fixedly connected to the top of the first guide plate to drive the first guide plate and the first sleeve to lift. The feed pipe and the air guide pipe are located on both sides of the outer wall of the first sleeve, respectively, to convey hard alloy powder slurry and drying gas into the first sleeve.

6. A mixing dryer based on cemented carbide powder processing according to claim 1, characterized in that, A third hydraulic rod is fixedly provided at the top center of the top seat. The telescopic shaft of the third hydraulic rod is fixedly connected to the top of the pressure head to drive the pressure head to rise and fall along the inner wall of the first sleeve. The side wall diameter of the telescopic shaft of the third hydraulic rod is smaller than the side wall diameter of the pressure head. A second guide plate is fitted onto the side wall of the guide rod and on top of the first guide plate. The center of the second guide plate is fixedly fitted onto the side wall of the telescopic shaft of the third hydraulic rod.

7. A mixing dryer based on cemented carbide powder processing according to claim 1, characterized in that, The transfer mechanism includes: The mounting bases are fixedly installed on the top of the base and arranged symmetrically with respect to the center point of the base. Electric slide rails are fixedly installed on the inner side of both mounting bases, and transfer plates are fixedly installed on the sliding end of the electric slide rails.

8. A mixing dryer based on cemented carbide powder processing according to claim 7, characterized in that, After the first sleeve moves into the second sleeve and abuts against the top of the filter disc, the first guide plate is positioned above the mounting base. The two mounting bases are located on both sides of the second sleeve, so that the transfer plate can be moved to the top of the second sleeve without affecting the entry of the first sleeve into the second sleeve.

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