Metal powder grinding device and method for metal tool manufacturing

Abstract

The invention relates to the technical field of metal manufacturing, in particular to a metal powder grinding device and method for metal tool manufacturing. Comprising a tank body, a top plate and a feeding cylinder which are fixedly connected to the tank body, a discharging opening formed in the tank body, a partition plate fixedly installed in the tank body, a transmission bin installed on the top plate, a first-stage conveying assembly installed on the partition plate, a second-stage conveying assembly installed on the top plate and a first-stage transmission assembly installed on the second-stage conveying assembly. The grinding assembly and the first-stage screening assembly are installed on the partition plate, and a second-stage screening assembly is installed on the tank body; according to the metal powder screening device, the first-stage screening assembly and the second-stage screening assembly are arranged, metal powder can be screened twice, part of metal powder passing through the first-stage screening assembly due to the fact that the hole diameter of the screening holes is increased can be screened out secondarily, and the yield probability of unqualified products is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of metal manufacturing, and in particular to a metal powder grinding device and method for manufacturing metal tools. Background Art

[0002] The processing of metal powder is an important part of powder metallurgy. The production and processing of powder includes the steps of powder preparation and powder mixing. In order to improve the formability and plasticity of the powder, plasticizers such as engine oil, rubber or paraffin can be added. The metal powder is pressed into the desired shape under a pressure of 15-600MPa (megapascals). After a series of heat treatment processes such as sintering, quenching, and oil immersion, the required metal tools and parts are finally obtained. The processing of metal powder is generally carried out by mechanical crushing or chemical reduction to obtain powder (particles) with a diameter of less than 1mm. Among them, the mechanical crushing method is generally to grind metal debris and then filter it with a screen to obtain the target metal powder. In addition, metal powder that does not meet the requirements needs to enter the grinding process again.

[0003] The existing Chinese invention patent with publication number CN 118080113 B discloses a metal powder processing and grinding device. The patent uses a stretchable and deformable screen as a component for metal powder grinding and screening, and combines it with an auger conveying component to repeatedly feed unqualified metal particles under the screen into the grinding process. The deformation of the screen used in the patent when moving up and down will cause the aperture at the deformation to shrink and expand. Some of the metal powder particles passing through the deformation will be larger than the standard particle size (because the deformation of the screen will cause the aperture at the deformation to stretch, and because of the gravity squeezing effect of the accumulated metal powder, some powder larger than the aperture will also be forced out of the aperture, causing the mesh of the screen made of elastic metal material to become larger). The particle size of the metal powder passing through is larger than the particle size required for processing.

[0004] Therefore, in order to solve the above problems, a device is designed to perform secondary recovery and grinding treatment on the metal powder passing through the screen made of elastic metal material, so as to further reduce the failure rate of the metal powder grinding treatment. Summary of the Invention

[0005] In order to overcome the problem that the sieve used in the prior art is easy to stretch and deform under the action of movement and gravity extrusion, some metal powder passing through is larger than the standard particle size, and the grinding process failure rate is high.

[0006] The technical solution of the present invention is: a metal powder grinding device for metal tool manufacturing, comprising a tank body, a top plate and a feed barrel fixedly connected to the tank body, a discharge port opened on the tank body, a partition fixedly installed in the tank body, a transmission bin installed on the top plate, a first-level conveying assembly installed on the partition, a second-level conveying assembly installed on the top plate, a first-level transmission assembly installed on the second-level conveying assembly, a grinding assembly and a first-level screening assembly installed on the partition, the input end of the second-level conveying assembly is connected to the output end of the first-level conveying assembly, the input end of the first-level transmission assembly is connected to the output end of the second-level conveying assembly, the input end of the grinding assembly is connected to the output end of the first-level transmission assembly, the input end of the first-level screening assembly is connected to the output end of the grinding assembly, and a channel connecting the grinding assembly and the first-level screening assembly is provided on the partition; a second-level screening assembly is installed on the tank body, the first-level conveying assembly is used to convey the metal powder on the first-level screening assembly into the grinding assembly, and the second-level conveying assembly is used to convey the metal powder on the second-level screening assembly into the grinding assembly.

[0007] Preferably, the first-stage conveying assembly includes an outer feed barrel fixedly mounted on the partition, a chassis fixedly mounted on the outer feed barrel, a through port and a guide groove opened on the outer feed barrel, an outer auger mounted in the outer feed barrel and an inner gear ring fixedly connected to the outer auger, the through port and the guide groove are connected, the guide groove is spirally arranged, the metal powder in the first-stage screening assembly can enter the outer feed barrel through the through port, a motor is installed on the second-stage conveying assembly, a driving gear is installed on the output end of the motor, the driving gear is meshed with the inner gear ring, the motor is used to drive the driving gear to rotate, the driving gear is used to drive the inner gear ring and the outer auger to rotate, and the outer auger is used to transport the metal powder on the first-stage screening assembly to the grinding assembly.

[0008] Preferably, the secondary conveying assembly includes an inner feed barrel fixedly mounted on the top plate, a bulk material platform fixedly connected to the inner feed barrel, an inner auger mounted in the inner feed barrel, a movable platform fixedly mounted on the inner auger, an outer ring gear fixedly mounted on the movable platform, a feeder fixedly mounted on the movable platform, a No. 1 driven gear movably connected to the inner feed barrel and a No. 2 driven gear fixedly mounted on the No. 1 driven gear, the inner feed barrel is arranged inside the outer auger, the bulk material platform is arranged above the outer feed barrel, the movable platform and the outer ring gear movably connected to the secondary screening assembly, the feeder is arranged in the discharge port, the No. 1 driven gear is meshed with the inner ring gear, the No. 2 driven gear is meshed with the outer ring gear, the inner ring gear is used to drive the No. 1 driven gear and the No. 2 driven gear to rotate, the No. 2 driven gear is used to drive the outer ring gear, the movable platform and the inner auger to rotate, and the inner auger is used to transport the metal powder on the secondary screening assembly to the grinding assembly.

[0009] Preferably, the first-stage transmission assembly includes a transmission rod fixedly mounted on the inner auger, a transmission platform fixedly mounted on the transmission rod, a transmission flat gear and a transmission bevel gear fixedly mounted on the transmission platform, a linkage gear No. 1 meshing with the transmission flat gear, a linkage gear No. 2 meshing with the linkage gear No. 1, and a linkage gear No. 3 mounted on the linkage gear No. 2. The transmission platform is movably connected in the transmission bin. When the inner auger rotates, the transmission platform, the transmission flat gear and the transmission bevel gear are driven to rotate through the transmission rod. The transmission flat gear is used to drive the linkage gear No. 1 to rotate, and the linkage gear No. 1 is used to drive the linkage gear No. 2 and the linkage gear No. 3 to rotate.

[0010] Preferably, the grinding assembly includes an outer grinding table movably connected to the partition, an upper gear ring and a middle gear ring fixedly mounted on the outer grinding table, an inner grinding table fixedly mounted on the partition, a fourth linkage gear movably connected to the partition and a fifth linkage gear fixedly mounted on the fourth linkage gear, the upper gear ring is movably connected to the top plate, the middle gear ring is movably connected to the partition, the inner grinding table is arranged inside the outer grinding table, the channel on the partition is arranged between the inner grinding table and the outer grinding table, the No. 3 linkage gear is engaged with the upper gear ring, and the No. 3 linkage gear is used to drive the upper gear ring, the outer grinding table and the middle gear ring to rotate, the No. 4 linkage gear is engaged with the middle gear ring, and the middle gear ring is used to drive the No. 4 linkage gear and the No. 5 linkage gear to rotate.

[0011] Preferably, the first-stage screening assembly includes a first-stage screen movably connected to the partition, a sliding sleeve and a lower gear ring fixedly mounted on the first-stage screen, and a sliding rod fixedly mounted on the sliding sleeve. The lower gear ring is movably connected to the partition, and the lower gear ring is engaged with the No. 5 linkage gear. The No. 5 linkage gear is used to drive the lower gear ring, the first-stage screen and the sliding sleeve to rotate. The sliding sleeve is mounted on the outside of the outer feed barrel, and a buffer ring is installed between the top of the sliding sleeve and the chassis. When the sliding sleeve rotates, the sliding rod moves in the through port or the guide groove; when the sliding rod moves from the through port to the guide groove, the sliding sleeve moves up in the vertical direction, and the first-stage screen shrinks and deforms; when the sliding rod moves from the guide groove to the through port, the sliding sleeve moves down in the vertical direction, and the first-stage screen stretches and deforms.

[0012] Preferably, the secondary screening assembly includes a secondary screen and a vibrator installed on the inner wall of the tank body and a return table installed on the tank body. The secondary screen is an annular structure and is arranged below the primary screen. The sliding sleeve can move in the vertical direction inside the secondary screen. The output end of the vibrator is against the secondary screen. The return table is arranged below the sliding sleeve, and the movable table and the outer gear ring are movably connected to the return table. When the sliding sleeve moves upward and leaves the secondary screen, the opening is closed, and the metal powder on the secondary screen enters the return table. When the sliding sleeve moves downward and enters the secondary screen, the opening is opened, and the metal powder on the primary screen enters the external feed barrel.

[0013] Preferably, a pressing assembly is installed in the transmission bin, and the pressing assembly includes a secondary transmission assembly, a diagonal assembly installed on the secondary transmission assembly, and an inflation assembly installed on the diagonal assembly. The input end of the secondary transmission assembly is connected to the output end of the primary transmission assembly, and the secondary transmission assembly is used to drive the diagonal assembly to move along a preset direction; when the diagonal assembly moves toward the grinding assembly along the preset direction, the gas in the diagonal assembly flows into the inflation assembly; when the diagonal assembly moves toward the side away from the grinding assembly along the preset direction, the gas in the inflation assembly flows into the diagonal assembly.

[0014] Preferably, the secondary transmission assembly includes a turntable movably connected to the transmission bin, a linkage bevel wheel mounted on the turntable and a rocker arm movably connected to the eccentric position of the turntable at one end, the linkage bevel wheel is meshed with the transmission bevel gear, the transmission bevel gear is used to drive the linkage bevel wheel and the turntable to rotate, and the turntable is used to drive the rocker arm to swing; the inclined pull assembly includes a push-pull rod movably connected to the other end of the rocker arm, a rubber plug fixedly mounted on the push-pull rod, a plunger fixedly mounted on the rubber plug and a pressure ring fixedly mounted on the plunger, and a top plate is provided with a relative to the plunger. The corresponding air cylinder, the plunger and the rubber plug are movably connected in the air cylinder, and the rocker arm is used to drive the push-pull rod, the rubber plug, the plunger and the pressure ring to move along the axial direction of the air cylinder; the inflation component includes an air inlet installed on the plunger and an air bag installed on the pressure ring, the plunger is a hollow structure, and the plunger is connected to the air cylinder through the air inlet, and the air bag is connected to the plunger; when the pressure ring moves toward the side of the grinding assembly, the gas in the air cylinder flows into the air bag through the air inlet and the plunger; when the pressure ring moves toward the side away from the grinding assembly, the gas in the air bag flows into the air cylinder through the air inlet and the plunger.

[0015] A method for grinding metal powder for metal tool manufacturing, using the metal powder grinding device for metal tool manufacturing as described above, comprises the following steps: S1: The user starts the motor first, and the motor outputs power to the driving gear. Through the meshing transmission of the driving gear and the inner gear ring, the outer auger rotates continuously. At the same time, the inner gear ring outputs power to the outer gear ring and the movable table through the meshing transmission of the No. 1 driven gear and the No. 2 driven gear, driving the inner and outer augers to rotate synchronously. S2: The transmission rod and transmission platform that rotate with the inner auger utilize the meshing transmission action of the transmission flat gear and the No. 1 linkage gear to transmit power to the No. 2 linkage gear and the No. 3 linkage gear. The meshing transmission action of the No. 3 linkage gear and the upper gear ring controls the rotation of the outer grinding table relative to the inner grinding table. S3: The metal material is then fed into the feed port formed between the feed barrel and the transmission chamber, and enters between the outer grinding table and the inner grinding table. The metal material is gradually ground into powder between the relatively rotating outer grinding table and flows through the channel into the primary screen. S4: During the grinding process, the rotating transmission table outputs power to the linkage bevel wheel through the transmission bevel gear, controlling the rotation of the turntable and driving the rocker arm to swing, generating continuous push-pull force on the push-pull rod, plunger and rubber plug, forcing the pressure ring to approach the metal material between the outer grinding table and the inner grinding table, producing a squeezing effect on it, narrowing the gap between the materials and increasing the friction between the metal materials; S5: When the plunger and the rubber plug move toward the outer grinding table and the inner grinding table, the gas in the cylinder is pressed into the air bag through the air inlet, and the air bag expands and further contacts the metal material. Even when the pressure ring does not contact the outer grinding table and the inner grinding table, it can still fully exert squeezing force on the metal material. S6: When the outer grinding table rotates, the first-level screen rotates along with the outer grinding table with the meshing transmission of the fourth linkage gear and the fifth linkage gear. During the rotation, the slide bar moves along the through-hole and the guide groove. Through the spiral structure of the guide groove, the slide bar and the sliding sleeve go through a slow rising stage and a fast falling stage, causing the first-level screen to continuously stretch or shrink and deform. In the fast falling stage, a shaking effect is generated to assist in screening the material. S7: During the up and down movement of the sleeve, the opening experiences two different states: closed and open. When the opening is not closed by the sleeve, the metal powder that has not passed through the primary screen enters the external feed barrel through the opening. Under the action of the external auger, it is transported to the space between the outer grinding table and the inner grinding table for secondary grinding. S8: The metal powder passing through the primary screen falls on the secondary screen. The vibrator acts on the secondary screen to assist the vibration and force some of the metal powder to pass through the secondary screen quickly and finally be discharged from the discharge port. S9: For the metal powder that has not passed through the secondary screen, the upper part of the return table opens during the upward movement of the sliding sleeve, and some of the metal powder on the secondary screen slides down into the return table. Under the action of the internal auger, it is transported back to the space between the outer grinding table and the inner grinding table for secondary grinding.

[0016] Beneficial effects of the present invention: 1. Through the setting of the primary screening component and the secondary screening component, the metal powder can be screened twice. Some metal powder that passes through the primary screening component due to the enlarged sieve hole diameter can be screened out for the second time, reducing the probability of unqualified product output; 2. Through the coordinated use of the primary conveying component and the secondary conveying component, the unqualified metal powder screened out by the primary screening component and the unqualified metal powder screened out by the secondary screening component can be transported respectively, with high conveying efficiency; 3. In actual use, by improving the structure of the No. 1 and No. 2 driven gears, adjusting the gear diameter and number of teeth, and adjusting the conveying efficiency of the external auger and the internal auger, the conveying efficiency of the external auger is made higher than that of the internal auger. Compared with the metal powder sifted by the first and second sieves, the grinding times of the powder with larger particle size sifted by the first sieve can be effectively increased in the same time; 4. Through the rotational power of the inner auger, the power is transmitted outward to the linked bevel wheel through the transmission platform and the transmission flat gear, driving the rocker arm to control the pressure ring to approach the metal material being ground, squeezing the metal material, narrowing the gap between the powder and increasing the interaction force between the materials, which is more conducive to grinding; 5. When the pressure ring approaches the metal material being ground, the compressed gas enters the air bag through the movement of the rubber plug in the air cylinder, and the expanded air bag further generates extrusion force on the metal material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 2 Shown is a schematic cross-sectional structure diagram of a metal powder grinding device for metal tool manufacturing according to the present invention; Figure 3 Shown is a schematic diagram of the first structure of the primary conveying assembly and the secondary conveying assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 4 Shown is a schematic diagram of the second structure of the primary conveying assembly and the secondary conveying assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 5 Shown is a schematic diagram of the third structure of the primary conveying assembly and the secondary conveying assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 6 Shown is a schematic diagram of the fourth structure of the primary conveying assembly and the secondary conveying assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 7 The metal powder grinding device for metal tool manufacturing of the present invention is shown. Figure 2 A in the middle is an enlarged schematic diagram of the structure; Figure 8 The metal powder grinding device for metal tool manufacturing of the present invention is shown. Figure 2 The enlarged structural diagram at B in the middle; Figure 9 Shown is a schematic diagram of the first structure of the primary transmission assembly and the grinding assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 10Shown is a schematic diagram of the second structure of the primary transmission assembly and the grinding assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 11 Shown is a schematic diagram of the first structure of the primary screening assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 12 Shown is a schematic diagram of the second structure of the first-stage screening assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 13 The metal powder grinding device for metal tool manufacturing of the present invention is shown. Figure 2 The enlarged structural diagram at C in the middle; Figure 14 The metal powder grinding device for metal tool manufacturing of the present invention is shown. Figure 2 The enlarged structural diagram at D in the middle; Figure 15 Shown is a schematic diagram of the first structure of the press assembly of the metal powder grinding device for metal tool manufacturing of the present invention; Figure 16 Shown is a schematic diagram of a second structure of a press assembly of a metal powder grinding device for metal tool manufacturing according to the present invention; Figure 17 The metal powder grinding device for metal tool manufacturing of the present invention is shown. Figure 2 The enlarged structural diagram at E in the middle; Figure 18 The metal powder grinding device for metal tool manufacturing of the present invention is shown. Figure 2 Enlarged structural diagram at F in the middle.

[0018] Explanation of the accompanying symbols: 1. Tank body; 2. Feed barrel; 3. Discharge port; 4. Partition; 7. Top plate; 8. Transmission bin; 501. External feed barrel; 502. Chassis; 503. Through port; 504. Guide groove; 505. External auger; 506. Inner gear ring; 507. Motor; 508. Driving gear; 601. Internal feed barrel; 602. Bulk material platform; 603. Inner auger; 604. Movable platform; 605. External gear ring; 606. Feeder; 607. No. 1 driven gear; 608. No. 2 driven gear; 901. Transmission rod; 902. Transmission platform; 903. Transmission flat gear; 904. Transmission bevel gear; 905. No. 1 linkage gear; 906. No. 2 linkage gear ;907, linkage gear No. 3;1001, outer grinding table;1002, upper gear ring;1003, middle gear ring;1004, inner grinding table;1005, linkage gear No. 4;1006, linkage gear No. 5;1101, primary screen;1102, sliding sleeve;1103, lower gear ring;1104, sliding rod;1105, buffer ring;1201, secondary screen;1202, vibrator;1203, return table;1301, turntable;1302, linkage bevel gear;1303, rocker arm;1304, push-pull rod;1305, air cylinder;1306, plunger;1307, rubber plug;1308, pressure ring;1309, air inlet;1310, air bag. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] See also Figures 1-18The present invention provides an embodiment: a metal powder grinding device for metal tool manufacturing, comprising a tank body 1, a top plate 7 and a feeding cylinder 2 fixedly connected to the tank body 1, a discharge port 3 opened on the tank body 1, a partition 4 fixedly installed in the tank body 1, a transmission bin 8 installed on the top plate 7, a first-level conveying assembly installed on the partition 4, a second-level conveying assembly installed on the top plate 7, a first-level transmission assembly installed on the second-level conveying assembly, a grinding assembly and a first-level screening assembly installed on the partition 4, the input end of the second-level conveying assembly is connected to the output end of the first-level conveying assembly, the input end of the first-level transmission assembly is connected to the output end of the second-level conveying assembly, the input end of the grinding assembly is connected to the output end of the first-level transmission assembly, the input end of the first-level screening assembly is connected to the output end of the grinding assembly, and a channel connecting the grinding assembly and the first-level screening assembly is provided on the partition 4; a second-level screening assembly is installed on the tank body 1, the first-level conveying assembly is used to convey the metal powder on the first-level screening assembly into the grinding assembly, and the second-level conveying assembly is used to convey the metal powder on the second-level screening assembly to the grinding assembly The user first starts the first-level conveying component, which drives the second-level conveying component to run together through the first-level conveying component. The second-level conveying component outputs power to the grinding component through the first-level transmission component, and puts the metal material into the feed port formed by the feed barrel 2 and the transmission bin 8, and falls directly into the grinding component. The grinding component crushes it, and the crushed metal material falls into the first-level screening component for the first screening. The first-level screening component also receives the power transmission of the grinding component to rotate. The metal material passing through the first-level screening component enters the second-level screening component again. The metal material that does not pass through the first-level screening component is re-conveyed to the grinding component for secondary grinding under the action of the first-level conveying component. The metal material entering the secondary screening component is screened for the second time, and the metal material passing through the secondary screening component is discharged and collected through the discharge port 3. The metal material that does not pass through the secondary screening component is re-conveyed to the grinding component for secondary grinding under the action of the secondary conveying component. The above process is repeated until all metal materials meeting the standard powder particle size pass through the secondary screening component.

[0021] See also Figure 2-Figure 8 、 Figure 11 and Figure 13In this embodiment, the primary conveying assembly includes an outer feed barrel 501 fixedly mounted on the partition 4, a chassis 502 fixedly mounted on the outer feed barrel 501, a through port 503 and a guide groove 504 opened on the outer feed barrel 501, an outer auger 505 mounted in the outer feed barrel 501 and an inner gear ring 506 fixedly connected to the outer auger 505, the through port 503 and the guide groove 504 are connected, and the guide groove 504 is spirally arranged. The metal powder in the primary screening assembly can enter the outer feed barrel 501 through the through port 503, and the secondary conveying assembly is equipped with a motor 507. A driving gear 508 is installed on the output end of the motor 507. The driving gear 508 is meshed with the inner gear ring 506. The motor 507 is used to drive the driving gear 508 to rotate, and the driving gear 508 is used to drive the inner gear ring 506 and the outer auger 50 5 rotates, and the external auger 505 is used to transport the metal powder on the primary screening assembly to the grinding assembly. The motor 507 drives the driving gear 508 to rotate. The driving gear 508 outputs power to the inner ring gear 506 through meshing transmission, causing the external auger 505 fixed to the inner ring gear 506 to rotate continuously. The metal material on the primary screening assembly can enter the external feed cylinder 501 through the through port 503. Under the action of the external auger 505, the metal material is transported upward, discharged from the external feed cylinder 501, and then re-enters the grinding assembly for secondary grinding treatment (it is worth noting that the through port 503 is not always in a state of connection with the primary screening assembly during the entire operation of the device. Instead, during the rotation of the primary screening assembly, the through port 503 will experience two different states: closed and opened by the primary screening assembly).

[0022] See also Figure 2-Figure 10 and Figure 13In this embodiment, the secondary conveying assembly includes an inner feeding cylinder 601 fixedly mounted on the top plate 7, a bulk material platform 602 fixedly connected to the inner feeding cylinder 601, an inner auger 603 mounted in the inner feeding cylinder 601, a movable platform 604 fixedly mounted on the inner auger 603, an outer gear ring 605 fixedly mounted on the movable platform 604, a feeder 606 fixedly mounted on the movable platform 604, a number one driven gear 607 movably connected to the inner feeding cylinder 601, and a number one driven gear 608 fixedly mounted on the number one driven gear 609. The second driven gear 608 on 07, the inner feeding cylinder 601 is arranged inside the outer feeding cylinder 505, the bulk material platform 602 is arranged above the outer feeding cylinder 501, the movable platform 604 and the outer gear ring 605 are movably connected to the secondary screening assembly, the feeder 606 is arranged in the discharge port 3, the first driven gear 607 is meshed with the inner gear ring 506, the second driven gear 608 is meshed with the outer gear ring 605, the inner gear ring 506 is used to drive the first driven gear 607 and the second driven gear 608 to rotate, the second driven gear 608 is used to drive the outer gear ring 605, the movable platform 604 and the inner auger 603 to rotate. The inner auger 603 is used to transport the metal powder on the secondary screening assembly to the grinding assembly. The rotating inner gear ring 506 outputs power to the outer gear ring 605 through the meshing transmission of the No. 1 driven gear 607 and the No. 2 driven gear 608, causing the movable platform 604 and the inner auger 603 to rotate on the secondary screening assembly. Part of the metal material entering the secondary screening assembly will be transported upward by the inner auger 603 (it is worth noting that During the rotation process, the first-level screening component will continuously open and close the connection point between the second-level screening component and the inner auger 603. When the connection point is opened, the metal material can enter the inner feed barrel 601 and contact the inner auger 603), slide from the bulk material table 602 into the grinding component for secondary grinding (the bulk material table 602 is a slope structure and the edge covers the outer feed barrel 501). When the movable table rotates, the feeder 606 rotates together and moves the metal material that may be blocked at the discharge port 3 to prevent blockage.

[0023] See also Figures 1-4 、 Figure 9-10 and Figure 17-18In this embodiment, the first-stage transmission assembly includes a transmission rod 901 fixedly mounted on the inner auger 603, a transmission platform 902 fixedly mounted on the transmission rod 901, a transmission flat gear 903 and a transmission bevel gear 904 fixedly mounted on the transmission platform 902, a No. 1 linkage gear 905 meshing with the transmission flat gear 903, a No. 2 linkage gear 906 meshing with the No. 1 linkage gear 905, and a No. 3 linkage gear 907 mounted on the No. 2 linkage gear 906. The transmission platform 902 is movably connected to the transmission compartment 8. When the inner auger 603 rotates, the transmission platform 902, the transmission flat gear 903 and the transmission bevel gear 904 are driven by the transmission rod 901. Gear 904 rotates, and the transmission flat gear 903 is used to drive the No. 1 linkage gear 905 to rotate. The No. 1 linkage gear 905 is used to drive the No. 2 linkage gear 906 and the No. 3 linkage gear 907 to rotate. The rotating inner auger 603 outputs power to the transmission platform 902 through the transmission rod 901. The transmission platform 902 outputs power to the No. 1 linkage gear 905 through the transmission flat gear 903, and in turn outputs power to the grinding assembly through the No. 2 linkage gear 906 and the No. 3 linkage gear 907, so that the grinding assembly grinds the metal material inside it. The transmission platform 902 stabilizes its own rotation state through the active connection with the transmission bin 8.

[0024] See also Figure 2-Figure 4 、 Figures 9-12 and Figure 14In this embodiment, the grinding assembly includes an outer grinding table 1001 movably connected to the partition 4, an upper gear ring 1002 and a middle gear ring 1003 fixedly mounted on the outer grinding table 1001, an inner grinding table 1004 fixedly mounted on the partition 4, a fourth linkage gear 1005 movably connected to the partition 4, and a fifth linkage gear 1006 fixedly mounted on the fourth linkage gear 1005. The upper gear ring 1002 is movably connected to the top plate 7, and the middle gear ring 1003 is movably connected to the partition 4. The inner grinding table 1004 is arranged inside the outer grinding table 1001, and the channel on the partition 4 is arranged between the inner grinding table 1004 and the outer grinding table 1001. The third linkage gear 907 is engaged with the upper gear ring 1002, and the third linkage gear 907 is used to drive the upper gear ring 1002, the outer grinding table 1001 and the middle gear ring 1003 to rotate. The fourth linkage gear 1005 is engaged with the middle gear ring 1003, and the middle gear ring 1003 is used to drive the fourth linkage gear 1005 and the fifth linkage gear As the wheel 1006 rotates, the third linkage gear 907 engages with the upper gear ring 1002 to drive the outer grinding table 1001 to rotate. Relative to the stationary inner grinding table 1004, the two exert a rotational friction on the metal material in between (in actual application, flanges, protrusions or gears are provided on the outer grinding table 1001 and the inner grinding table 1004 to increase the grinding effect on the metal material. It is worth noting that the outer grinding table 1001 and the inner grinding table 1004 are both conical table structures, and the gap between them is wide at the top and narrow at the bottom, that is, the extrusion and grinding force on the metal material in the lower layer is greater, and eventually part of the metal material is discharged from the channel on the partition 4 into the primary screening assembly). The power is output to the fourth linkage gear 1005 and the fifth linkage gear 1006 through the middle gear ring 1003 rotating together with the outer grinding table 1001, and then the power is output to the primary screening assembly with the help of the fifth linkage gear 1006, driving it to rotate.

[0025] See also Figure 2 、 Figure 7-Figure 8 and Figure 11-14In this embodiment, the first-stage screening assembly includes a first-stage screen 1101 movably connected to the partition 4, a sliding sleeve 1102 and a lower gear ring 1103 fixedly installed on the first-stage screen 1101, and a sliding rod 1104 fixedly installed on the sliding sleeve 1102. The lower gear ring 1103 is movably connected to the partition 4, and the lower gear ring 1103 is engaged with the No. 5 linkage gear 1006. The No. 5 linkage gear 1006 is used to drive the lower gear ring 1103, the first-stage screen 1101 and the sliding sleeve 1102 to rotate. The sliding sleeve 1102 is sleeved on the outside of the outer feed barrel 501. A buffer ring 1105 is installed between the top of the sliding sleeve 1102 and the chassis 502. When the sliding sleeve 1102 rotates, the sliding rod 1104 moves in the through port 503 or the guide groove 5 04; when the slide bar 1104 moves from the through-port 503 to the guide groove 504, the sleeve 1102 moves up in the vertical direction, and the primary screen 1101 contracts and deforms; when the slide bar 1104 moves from the guide groove 504 to the through-port 503, the sleeve 1102 moves down in the vertical direction, and the primary screen 1101 stretches and deforms, and the fifth linkage gear 1006 drives the primary screen 1101 (made of elastic metal material with an aperture of the standard particle size of the processed metal powder) and the sleeve 1102 and the slide bar 1104 fixed to the primary screen 1101 to rotate, so that the slide bar 1104 moves in the through-port 503 and the guide groove 504. When the slide bar 1104 moves from the guide groove 504 to the through-port 503, the sleeve 1102 moves down in the vertical direction, and the primary screen 1101 stretches and deforms, and the fifth linkage gear 1006 drives the primary screen 1101 (made of elastic metal material with an aperture of the standard particle size of the processed metal powder) and the sleeve 1102 and the slide bar 1104 fixed to the primary screen 1101 to rotate, so that the slide bar 1104 moves in the through-port 503 and the guide groove 504. When 1104 moves from the lowest end of the through-port 503 to the guide groove 504, the slide bar 1104 and the sleeve 1102 continue to rise with the spiral guide groove 504, producing a compression effect on the primary screen 1101. When the slide bar 1104 moves to the highest point of the guide groove 504 and continues to move, it suddenly falls through the step structure where the highest point of the guide groove 504 meets the through-port 503 and enters the through-port 503. The primary screen 1101 suddenly recovers its stretched state and produces a vibration effect, which throws out the metal powder stuck on the sieve holes of the primary screen 1101. The buffer ring 1105 is made of elastic material. When the sleeve 1102 rises, the buffer ring 1105 stretches out. When the sleeve 1102 falls, the buffer ring 1105 5 automatically shrinks and is temporarily stored in the cavity between the sliding sleeve 1102 and the chassis 502. When the sliding rod 1104 drops instantly at the step, the sliding sleeve 1102 and the chassis 502 approach each other and hit the buffer ring 1105 together. At this time, no force is generated between the sliding rod 1104 and the chassis 502, avoiding structural damage. When the sliding sleeve 1102 rises to the highest point, the through hole 503 is completely closed by the sliding sleeve 1102, and the metal material in the primary screen 1101 cannot pass through the through hole 503 to enter the external feed barrel 501. When the sliding sleeve 1102 drops instantly at the step, the through hole 503 is instantly opened. As the sliding sleeve 1102 rises again, the area of the through hole 503 covered by the sliding sleeve 1102 gradually increases.

[0026] See also Figure 2-Figure 4 、 Figure 7-Figure 8 and Figure 11-13 In this embodiment, the secondary screening assembly includes a secondary screen 1201 and a vibrator 1202 installed on the inner wall of the tank body 1, and a return material table 1203 installed on the tank body 1. The secondary screen 1201 is an annular structure and is arranged below the primary screen 1101. The sliding sleeve 1102 can move in the vertical direction inside the secondary screen 1201, and the output end of the vibrator 1202 abuts against the secondary screen 1201. The return material table 1203 is arranged below the sliding sleeve 1102, and the movable table 604 and the outer gear ring 605 are movably connected to the return material table 1203; when the sliding sleeve 1102 moves upward and leaves the secondary screen 1201, the through port 503 is closed, and the metal powder on the secondary screen 1201 enters the return material table 1203; when the sliding sleeve 1102 moves downward and enters the secondary screen 1201, the through port 503 is opened, and the metal powder on the primary screen 1101 enters the outer feed cylinder 50 1. The metal materials (some of which meet the particle size requirements and some of which are larger than the standard particle size) that pass through the sieve holes on the primary screen 1101 fall on the secondary screen 1201. Under the action of the vibrator 1202, the secondary screen 1201 continues to shake, accelerating the passage of the metal materials that meet the requirements, and the materials that do not meet the requirements are temporarily stored on the secondary screen 1201. When the sliding sleeve 1102 rises and leaves the secondary screen 1201, the connection point between the secondary screen 1201 and the return material table 1203 is opened (it is worth noting that in actual use, the inclination of the secondary screen 1201 and the distance between it and the sliding sleeve 1102 can be adjusted, so that when the sliding sleeve 1102 moves up and down, the length of time the connection point between the secondary screen 1201 and the return material table 1203 is closed and the length of time it is opened can be set as needed). The temporarily stored metal materials slide into the return material table 1203 and are transported upward by the inner auger 603.

[0027] See also Figures 1-4 、 Figure 9-10 and Figure 15-18In this embodiment, a pressing assembly is installed in the transmission warehouse 8, and the pressing assembly includes a secondary transmission assembly, an oblique-pull assembly installed on the secondary transmission assembly, and an inflation assembly installed on the oblique-pull assembly. The input end of the secondary transmission assembly is connected to the output end of the primary transmission assembly, and the secondary transmission assembly is used to drive the oblique-pull assembly to move along a preset direction; when the oblique-pull assembly moves toward one side of the grinding assembly along the preset direction, the gas in the oblique-pull assembly flows into the inflation assembly; when the oblique-pull assembly moves toward the side away from the grinding assembly along the preset direction, the gas in the inflation assembly flows into the oblique-pull assembly, and the secondary transmission assembly includes a rotary disk 1301 movably connected in the transmission warehouse 8, a linkage bevel wheel 1302 installed on the rotary disk 1301, and a rocker arm 1303 with one end movably connected to the eccentric position of the rotary disk 1301, the linkage bevel wheel 1302 is meshed with the transmission bevel gear 904, and the transmission bevel gear 904 is used to drive the linkage bevel wheel 1302 and the rotary disk 1301 to rotate, and the rotary disk 1301 is used to drive the rocker arm 1303 to swing; the oblique-pull assembly includes A push-pull rod 1304 movably connected to the other end of the rocker arm 1303, a rubber plug 1307 fixedly mounted on the push-pull rod 1304, a plunger 1306 fixedly mounted on the rubber plug 1307 and a pressure ring 1308 fixedly mounted on the plunger 1306, a gas cylinder 1305 corresponding to the plunger 1306 is mounted on the top plate 7, the plunger 1306 and the rubber plug 1307 are movably connected in the gas cylinder 1305, and the rocker arm 1303 is used to drive the push-pull rod 1304, the rubber plug 1307, the plunger 1306 and the pressure ring 1308 moves along the axis of the gas cylinder 1305; the inflation assembly includes an air inlet 1309 installed on the plunger 1306 and an air bag 1310 installed on the pressure ring 1308. The plunger 1306 is a hollow structure, and the plunger 1306 is connected to the gas cylinder 1305 through the air inlet 1309, and the air bag 1310 is connected to the plunger 1306; when the pressure ring 1308 moves toward the side of the grinding assembly, the gas in the gas cylinder 1305 flows into the air bag 1310 through the air inlet 1309 and the plunger 1306;When the pressure ring 1308 moves toward the side away from the grinding assembly, the gas in the air bag 1310 flows into the air cylinder 1305 through the air inlet 1309 and the plunger 1306. The gap between the metal material (especially the upper material) between the outer grinding table 1001 and the inner grinding table 1004 is large, the interaction force is small, and it completely relies on its own weight to sink. The effect of the rotary grinding treatment is relatively poor. Therefore, a pressing assembly is set to push the metal material as the outer grinding table 1001 rotates. The rotating transmission table 902 is first driven by the meshing transmission bevel gear 904 and the linkage bevel wheel 1302 to output the dynamic The force is applied to rotating disk 1301, causing it to swing rocker arm 1303, controlling the reciprocating motion of push-pull rod 1304, plunger 1306, and rubber plug 1307 within cylinder 1305. This in turn generates a push-pull force on pressure ring 1308. When pressure ring 1308 moves toward the metal material, the gas in cylinder 1305 enters airbag 1310 through air inlet 1309. Airbag 1310 expands, increasing its contact area with the metal material and cooperating with pressure ring 1308 to squeeze the metal material. When pressure ring 1308 moves away from the metal material, the gas in airbag 1310 flows back into cylinder 1305.

[0028] See also Figures 1-18 In this embodiment, the present invention provides a method for grinding metal powder for metal tool manufacturing, using a metal powder grinding device for metal tool manufacturing as described above, comprising the following steps: S1: The user first starts the motor 507. The motor 507 (serving as the power source of the entire grinding device) outputs power to the driving gear 508. Through the meshing transmission of the driving gear 508 and the inner gear ring 506, the outer auger 505 rotates continuously. At the same time, the inner gear ring 506 outputs power to the outer gear ring 605 and the movable platform 604 through the meshing transmission of the No. 1 driven gear 607 and the No. 2 driven gear 608, driving the inner auger 603 and the outer auger 505 to rotate synchronously. S2: The transmission rod 901 and transmission platform 902, which rotate along with the inner auger 603, utilize the meshing transmission action of the transmission flat gear 903 and the No. 1 linkage gear 905 to transmit power to the No. 2 linkage gear 906 and the No. 3 linkage gear 907. The meshing transmission action of the No. 3 linkage gear 907 and the upper gear ring 1002 controls the rotation of the outer grinding table 1001 relative to the inner grinding table 1004 (the gap between the outer grinding table 1001 and the inner grinding table 1004 gradually decreases from top to bottom. The inner walls of the outer grinding table 1001 and the inner grinding table 1004 are both provided with flanges or gear structures for grinding metal materials); S3: The metal material is then fed into the feed port formed between the feed barrel 2 and the transmission chamber 8 and enters between the outer grinding table 1001 and the inner grinding table 1004. The metal material is gradually ground into powder between the relatively rotating outer grinding table 1001 and the inner grinding table 1004, and then flows through the channel (larger than the standard size of the metal powder) and enters the primary screen 1101. S4: During the grinding process, the rotating transmission platform 902 outputs power to the linkage bevel wheel 1302 through the transmission bevel gear 904, controlling the rotation of the rotary disk 1301, driving the rocker arm 1303 to swing, and generating continuous push-pull forces on the push-pull rod 1304, the plunger 1306, and the rubber plug 1307, causing the pressure ring 1308 to approach the metal material between the outer grinding table 1001 and the inner grinding table 1004, producing a squeezing effect on the metal material, narrowing the gap between the materials, and increasing the friction between the metal materials; S5: When the plunger 1306 and the rubber plug 1307 move toward the outer grinding table 1001 and the inner grinding table 1004, the gas in the air cylinder 1305 is pressed into the air bag 1310 through the air inlet 1309. The air bag 1310 expands and further contacts the metal material. Even when the pressure ring 1308 does not contact the outer grinding table 1001 and the inner grinding table 1004, it can still fully exert a squeezing force on the metal material (when the plunger 1306 and the rubber plug 1307 move in the opposite direction, the gas in the air bag 1310 flows back into the air cylinder 1305); S6: When the outer grinding table 1001 rotates, the first-level screen 1101 (the aperture of the screen is consistent with the standard particle size of the metal powder) rotates along with the outer grinding table 1001 by means of the meshing transmission of the fourth linkage gear 1005 and the fifth linkage gear 1006. During the rotation, the slide bar 1104 moves along the through-port 503 and the guide groove 504. Through the spiral structure of the guide groove 504, the slide bar 1104 and the sliding sleeve 1102 go through a slow rising stage and a fast falling stage (the highest point of the guide groove 504 is connected to the through-port 503, and a step-like structure is formed, so that when the slide bar 1104 enters the through-port 503 from the guide groove 504, it will fall from the top of the step-like structure to the bottom), causing the first-level screen 1101 to continuously stretch or shrink and deform, and produce a shaking effect in the fast falling stage to assist in screening materials; S7: During the upward and downward movement of the sleeve 1102, the opening 503 experiences two different states: closed and open. When the opening 503 is not closed by the sleeve 1102, the metal powder that has not passed through the primary screen 1101 enters the outer feed barrel 501 through the opening 503. Under the action of the outer auger 505, it is transported back to the space between the outer grinding table 1001 and the inner grinding table 1004 for secondary grinding (the metal material after secondary grinding includes some qualified powder and some unqualified powder). S8: The metal powder passing through the primary screen 1101 (because the primary screen 1101 undergoes continuous stretching and contraction deformation during rotation, the screen aperture increases, so the metal powder passing through includes some metal powder that meets the standard particle size and some metal powder that does not meet the standard particle size) falls on the secondary screen 1201. The vibrator 1202 acts on the secondary screen 1201 to assist in the vibration, forcing some of the metal powder to quickly pass through the secondary screen 1201 (the screen aperture is consistent with the standard particle size of the metal powder), and is finally discharged from the discharge port 3; S9: For the metal powder that has not passed through the secondary screen 1201, the upper part of the return table 1203 is opened during the upward movement of the sliding sleeve 1102, and some of the metal powder on the secondary screen 1201 slides into the return table 1203, and is transported back to the space between the outer grinding table 1001 and the inner grinding table 1004 for secondary grinding under the action of the internal auger 603 (the metal material for the secondary grinding includes some qualified powder and some unqualified powder).

Claims

1. A metal powder grinding device for metal tool manufacturing, characterized in that: The invention comprises a tank body (1), a top plate (7) and a feed cylinder (2) fixedly connected to the tank body (1), a discharge port (3) opened on the tank body (1), a partition (4) fixedly installed in the tank body (1), a transmission bin (8) installed on the top plate (7), a primary conveying assembly installed on the partition (4), a secondary conveying assembly installed on the top plate (7), a primary transmission assembly installed on the secondary conveying assembly, a grinding assembly and a primary screening assembly installed on the partition (4), wherein the input end of the secondary conveying assembly is connected to the output end of the primary conveying assembly, the input end of the primary transmission assembly is connected to the output end of the secondary conveying assembly, the input end of the grinding assembly is connected to the output end of the primary transmission assembly, the input end of the primary screening assembly is connected to the output end of the grinding assembly, and the partition (4) is provided with a channel connecting the grinding assembly and the primary screening assembly; A secondary screening assembly is installed on the tank body (1), the primary conveying assembly is used to convey the metal powder on the primary screening assembly to the grinding assembly, and the secondary conveying assembly is used to convey the metal powder on the secondary screening assembly to the grinding assembly.

2. The metal powder grinding device for metal tool manufacturing according to claim 1, characterized in that: The first-stage conveying assembly includes an outer feed barrel (501) fixedly mounted on the partition (4), a chassis (502) fixedly mounted on the outer feed barrel (501), a through port (503) and a guide groove (504) opened on the outer feed barrel (501), an outer auger (505) mounted in the outer feed barrel (501), and an inner gear ring (506) fixedly connected to the outer auger (505), the through port (503) and the guide groove (504) being connected, and the guide groove (504) being arranged in a spiral shape. The metal in the first-stage screening assembly The powder can enter the external feed barrel (501) through the opening (503). A motor (507) is installed on the secondary conveying assembly. A driving gear (508) is installed on the output end of the motor (507). The driving gear (508) is meshed with the inner gear ring (506). The motor (507) is used to drive the driving gear (508) to rotate. The driving gear (508) is used to drive the inner gear ring (506) and the external auger (505) to rotate. The external auger (505) is used to transport the metal powder on the primary screening assembly to the grinding assembly.

3. The metal powder grinding device for metal tool manufacturing according to claim 2, characterized in that: The secondary conveying assembly comprises an inner feeding barrel (601) fixedly mounted on the top plate (7), a bulking platform (602) fixedly connected to the inner feeding barrel (601), an inner auger (603) mounted in the inner feeding barrel (601), a movable platform (604) fixedly mounted on the inner auger (603), an outer gear ring (605) fixedly mounted on the movable platform (604), a feeder (606) fixedly mounted on the movable platform (604), a No. 1 driven gear (607) movably connected to the inner feeding barrel (601), and a No. 2 driven gear (608) fixedly mounted on the No. 1 driven gear (607). The inner feeding barrel (601) is arranged inside the outer auger (505). The bulking platform (602) is fixedly connected to the inner feeding barrel (601). The material platform (602) is arranged above the outer feeding cylinder (501), the movable platform (604) and the outer gear ring (605) are movably connected to the secondary screening assembly, the feeder (606) is arranged in the discharge port (3), the No. 1 driven gear (607) is meshed with the inner gear ring (506), the No. 2 driven gear (608) is meshed with the outer gear ring (605), the inner gear ring (506) is used to drive the No. 1 driven gear (607) and the No. 2 driven gear (608) to rotate, the No. 2 driven gear (608) is used to drive the outer gear ring (605), the movable platform (604) and the inner auger (603) to rotate, and the inner auger (603) is used to transport the metal powder on the secondary screening assembly to the grinding assembly.

4. The metal powder grinding device for metal tool manufacturing according to claim 3, characterized in that: The primary transmission assembly includes a transmission rod (901) fixedly mounted on the inner auger (603), a transmission platform (902) fixedly mounted on the transmission rod (901), a transmission flat gear (903) and a transmission bevel gear (904) fixedly mounted on the transmission platform (902), a No. 1 linkage gear (905) meshed with the transmission flat gear (903), a No. 2 linkage gear (906) meshed with the No. 1 linkage gear (905), and a No. 2 linkage gear (906) mounted on the No. 2 linkage gear (906). The third linkage gear (907) on the transmission platform (902) is movably connected to the transmission bin (8). When the inner auger (603) rotates, the transmission platform (902), the transmission flat gear (903) and the transmission bevel gear (904) are driven to rotate through the transmission rod (901). The transmission flat gear (903) is used to drive the first linkage gear (905) to rotate, and the first linkage gear (905) is used to drive the second linkage gear (906) and the third linkage gear (907) to rotate.

5. The metal powder grinding device for metal tool manufacturing according to claim 4, characterized in that: The grinding assembly comprises an outer grinding table (1001) movably connected to the partition (4), an upper gear ring (1002) and a middle gear ring (1003) fixedly mounted on the outer grinding table (1001), an inner grinding table (1004) fixedly mounted on the partition (4), a fourth linkage gear (1005) movably connected to the partition (4), and a fifth linkage gear (1006) fixedly mounted on the fourth linkage gear (1005), the upper gear ring (1002) being movably connected to the top plate (7), the middle gear ring (1003) being movably connected to the partition (4), the inner grinding table (1004) being fixedly mounted on the partition (4), 04) is arranged inside the outer grinding table (1001), the channel on the partition (4) is arranged between the inner grinding table (1004) and the outer grinding table (1001), the third linkage gear (907) is engaged with the upper gear ring (1002), the third linkage gear (907) is used to drive the upper gear ring (1002), the outer grinding table (1001) and the middle gear ring (1003) to rotate, the fourth linkage gear (1005) is engaged with the middle gear ring (1003), and the middle gear ring (1003) is used to drive the fourth linkage gear (1005) and the fifth linkage gear (1006) to rotate.

6. The metal powder grinding device for metal tool manufacturing according to claim 5, characterized in that: The first-stage screening assembly comprises a first-stage screen (1101) movably connected to the partition (4), a sliding sleeve (1102) and a lower gear ring (1103) fixedly mounted on the first-stage screen (1101), and a sliding rod (1104) fixedly mounted on the sliding sleeve (1102). The lower gear ring (1103) is movably connected to the partition (4). The lower gear ring (1103) is engaged with a No. 5 linkage gear (1006). The No. 5 linkage gear (1006) is used to drive the lower gear ring (1103), the first-stage screen (1101) and the sliding sleeve (1102) to rotate. The sliding sleeve (1102) is sleeved on the outside of the outer feed barrel (501). A buffer ring (1105) is installed between the top of the sliding sleeve (1102) and the chassis (502). When the sliding sleeve (1102) rotates, the sliding rod (1104) moves in the through port (503) or the guide groove (504). When the slide rod (1104) moves from the opening (503) to the guide groove (504), the slide sleeve (1102) moves up in the vertical direction, and the first-level screen (1101) contracts and deforms; when the slide rod (1104) moves from the guide groove (504) to the opening (503), the slide sleeve (1102) moves down in the vertical direction, and the first-level screen (1101) stretches and deforms.

7. The metal powder grinding device for metal tool manufacturing according to claim 6, characterized in that: The secondary screening assembly comprises a secondary screen (1201) and a vibrator (1202) mounted on the inner wall of the tank body (1), and a return material table (1203) mounted on the tank body (1); the secondary screen (1201) is an annular structure and is arranged below the primary screen (1101); the sliding sleeve (1102) can move vertically in the secondary screen (1201); the output end of the vibrator (1202) abuts against the secondary screen (1201); the return material table (1203) is arranged below the sliding sleeve (1102); and the movable table (604) and the outer gear ring (605) are movably connected to the return material table (1203); When the sliding sleeve (1102) moves upward and leaves the secondary screen (1201), the opening (503) is closed, and the metal powder on the secondary screen (1201) enters the return material table (1203); when the sliding sleeve (1102) moves downward and enters the secondary screen (1201), the opening (503) is opened, and the metal powder on the primary screen (1101) enters the external feed tube (501).

8. The metal powder grinding device for metal tool manufacturing according to claim 7, characterized in that: A pressing assembly is installed in the transmission bin (8), the pressing assembly comprising a secondary transmission assembly, an oblique-stayed assembly installed on the secondary transmission assembly, and an inflation assembly installed on the oblique-stayed assembly, the input end of the secondary transmission assembly being connected to the output end of the primary transmission assembly, and the secondary transmission assembly being used to drive the oblique-stayed assembly to move along a preset direction; When the oblique-stayed assembly moves toward the grinding assembly along a preset direction, the gas in the oblique-stayed assembly flows into the inflation assembly; when the oblique-stayed assembly moves toward the side away from the grinding assembly along a preset direction, the gas in the inflation assembly flows into the oblique-stayed assembly.

9. The metal powder grinding device for metal tool manufacturing according to claim 8, characterized in that: The secondary transmission assembly comprises a rotary disk (1301) movably connected in the transmission bin (8), a linkage bevel wheel (1302) mounted on the rotary disk (1301), and a rocker arm (1303) having one end movably connected to an eccentric position of the rotary disk (1301), the linkage bevel wheel (1302) meshing with the transmission bevel gear (904), the transmission bevel gear (904) being used to drive the linkage bevel wheel (1302) and the rotary disk (1301) to rotate, and the rotary disk (1301) being used to drive the rocker arm (1303) to swing; The inclined-pull assembly comprises a push-pull rod (1304) movably connected to the other end of the rocker arm (1303), a rubber plug (1307) fixedly mounted on the push-pull rod (1304), a plunger (1306) fixedly mounted on the rubber plug (1307), and a pressure ring (1308) fixedly mounted on the plunger (1306); an air cylinder (1305) corresponding to the plunger (1306) is mounted on the top plate (7); the plunger (1306) and the rubber plug (1307) are movably connected in the air cylinder (1305); and the rocker arm (1303) is used to drive the push-pull rod (1304), the rubber plug (1307), the plunger (1306), and the pressure ring (1308) to move along the axial direction of the air cylinder (1305); The inflation component includes an air inlet (1309) installed on the plunger (1306) and an air bag (1310) installed on the pressure ring (1308); the plunger (1306) is a hollow structure, and the plunger (1306) is connected to the air cylinder (1305) through the air inlet (1309); the air bag (1310) is connected to the plunger (1306); When the pressure ring (1308) moves toward the side of the grinding assembly, the gas in the air cylinder (1305) flows into the air bag (1310) through the air inlet (1309) and the plunger (1306); when the pressure ring (1308) moves toward the side away from the grinding assembly, the gas in the air bag (1310) flows into the air cylinder (1305) through the air inlet (1309) and the plunger (1306).

10. A method for grinding metal powder for metal tool manufacturing, characterized in that: The metal powder grinding device for metal tool manufacturing according to claim 9 comprises the following steps: S1: The user first starts the motor (507), and the motor (507) outputs power to the driving gear (508). Through the meshing transmission of the driving gear (508) and the inner gear ring (506), the outer auger (505) rotates continuously. At the same time, the inner gear ring (506) outputs power to the outer gear ring (605) and the movable platform (604) through the meshing transmission of the No. 1 driven gear (607) and the No. 2 driven gear (608), driving the inner auger (603) and the outer auger (505) to rotate synchronously; S2: The transmission rod (901) and the transmission platform (902) rotating together with the inner auger (603) transmit power to the second linkage gear (906) and the third linkage gear (907) by means of the meshing transmission action of the transmission flat gear (903) and the first linkage gear (905). The outer grinding platform (1001) is controlled to rotate relative to the inner grinding platform (1004) by means of the meshing transmission action of the third linkage gear (907) and the upper gear ring (1002); S3: The metal material is then fed into the feed port formed between the feed barrel (2) and the transmission chamber (8), and enters between the outer grinding table (1001) and the inner grinding table (1004), where it is gradually ground into powder by the relatively rotating outer grinding table (1001) and the inner grinding table (1004), and then flows through the channel and enters the primary screen (1101); S4: During the grinding process, the rotating transmission table (902) outputs power to the linkage bevel wheel (1302) through the transmission bevel gear (904), controls the rotation of the rotary disk (1301), drives the rocker arm (1303) to swing, and generates continuous push-pull forces on the push-pull rod (1304), the plunger (1306) and the rubber plug (1307), so that the pressure ring (1308) approaches the metal material between the outer grinding table (1001) and the inner grinding table (1004), produces a squeezing effect on the metal material, narrows the gap between the materials, and increases the friction between the metal materials; S5: When the plunger (1306) and the rubber plug (1307) move closer to the outer grinding table (1001) and the inner grinding table (1004), the gas in the gas cylinder (1305) is pressed into the gas bag (1310) through the gas inlet (1309), and the gas bag (1310) expands and further contacts the metal material. Even when the pressure ring (1308) does not contact the outer grinding table (1001) and the inner grinding table (1004), it can still generate sufficient squeezing force on the metal material. S6: When the outer grinding table (1001) rotates, the first-stage screen (1101) rotates along with the outer grinding table (1001) by means of the meshing transmission of the fourth linkage gear (1005) and the fifth linkage gear (1006). During the rotation, the slide bar (1104) moves along the through opening (503) and the guide groove (504). Through the spiral structure of the guide groove (504), the slide bar (1104) and the sliding sleeve (1102) go through a slow rising stage and a fast falling stage, causing the first-stage screen (1101) to continuously stretch or shrink and deform, and produce a shaking effect in the fast falling stage, thereby assisting in screening the material; S7: During the upward and downward movement of the sleeve (1102), the opening (503) experiences two different states: closed and open. When the opening (503) is not closed by the sleeve (1102), the metal powder that has not passed through the primary screen (1101) enters the external feed barrel (501) through the opening (503) and is transported to the space between the external grinding table (1001) and the internal grinding table (1004) for secondary grinding under the action of the external auger (505); S8: The metal powder passing through the primary screen (1101) falls onto the secondary screen (1201). The vibrator (1202) acts on the secondary screen (1201) to assist in the vibration, forcing part of the metal powder to quickly pass through the secondary screen (1201) and finally be discharged from the discharge port (3); S9: The metal powder that has not passed through the secondary screen (1201) is opened on the upper part of the return table (1203) during the upward movement of the sliding sleeve (1102), and part of the metal powder on the secondary screen (1201) slides into the return table (1203), and is transported back to the outer grinding table (1001) and the inner grinding table (1004) for secondary grinding under the action of the inner auger (603).

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