A cemented carbide powder granulation screening machine and screening method

Abstract

The present invention provides a cemented carbide powder granulation screening machine and screening method, and relates to the technical field of cemented carbide granulation. The cemented carbide powder granulation screening machine comprises a powder screening box, the top of which is fixedly connected to a gantry mounting frame, and the top of which is penetrated and fixedly connected to a material discharge connection pipe. The second servo motor is started to rotate the hollow installation pipe with four material receiving transfer plates, and the installation air pump is started at the same time, and the air enters the interior of the rotating air intake pipe through the first fixed pipe, and then the valve on the corresponding built-in connection pipe is opened, and the air is instantly blown out through the air permeable mesh plate, so that the powder is blown out obliquely and falls onto the screening filter net in a parabolic shape. During the powder blowing and throwing process, the parabolas formed by large particles and small particles are different. Therefore, the powder has undergone a preliminary screening before falling onto the screening filter net, ensuring the subsequent efficient screening operation.

Description

Technical Field

[0001] The invention relates to the technical field of cemented carbide granulation, in particular to a cemented carbide powder granulation screening machine and a screening method. Background Art

[0002] Cemented carbide is a metal ceramic tool material prepared by powder metallurgy with refractory metal compounds (WC, TaC, TiC, NbC, etc.) as the matrix and transition metals (Co, Fe, Ni) as the bonding phase. It has the advantages of high strength, high hardness, high elastic modulus, wear resistance, corrosion resistance, small thermal expansion coefficient and relatively stable chemical properties. It is widely used in cutting tools, wear-resistant parts, mining and road construction machinery and other fields.

[0003] When granulating cemented carbide, firstly, the powder with good particle size after screening is evenly mixed and ground. After vacuum drying, the mixed and ground raw materials are screened to remove agglomerates, and then granulated. From the above, it can be seen that cemented carbide needs to be screened before granulation. Traditional screening machines often directly put powder into the machine body and screen it through vibration. However, this method often causes large particles of powder to accumulate on the filter screen, causing the filter screen to be blocked, and it needs to be cleaned frequently, affecting the screening efficiency. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a cemented carbide powder granulation screening machine and screening method, which solves the problem that traditional screening machines often directly put powder into the machine body and screen it through vibration, but this method often causes large particles of powder to accumulate on the filter screen, causing the filter screen to be blocked, requiring regular cleaning, and affecting the screening efficiency.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a cemented carbide powder granulation screening machine, comprising a powder screening box, the top of the powder screening box is fixedly connected to a gantry mounting frame, the top of the gantry mounting frame is penetrated and fixedly connected with a feeding connection pipe, the top of the feeding connection pipe is fixedly connected with a storage fixed cylinder, a blocking component is arranged on one side of the gantry mounting frame, the rear side of the powder screening box is penetrated and rotatably connected with a rotating air intake pipe, the rear side of the powder screening box is equipped with a driving component for driving the rotating air intake pipe to rotate, the end of the rotating air intake pipe located inside the powder screening box is fixedly connected to a hollow mounting pipe, and the outer surface of the hollow mounting pipe is fixedly connected with four circular arrays. The cloth receiving transfer plate body has an air-permeable mesh plate fixedly embedded on its surface, an air blowing assembly connected to a rotating air inlet pipe is installed on the rear side of the powder screening box body, a trapezoidal material guide platform is fixedly connected to the inner bottom of the powder screening box body, two groups of first knocking assemblies are arranged inside the trapezoidal material guide platform, a second rubber sheet is fixedly connected to the top of the trapezoidal material guide platform, a screening filter is fixedly connected to the end of the second rubber sheet away from the trapezoidal material guide platform, a first rubber sheet is fixedly connected to the end of the screening filter away from the second rubber sheet, and a first rubber sheet is fixedly connected to the inner top of the powder screening box body at one end, and a second knocking assembly adapted to the screening filter is installed on the rear side of the powder screening box body.

[0008] Preferably, the blocking assembly includes a reciprocating pull plate inserted through the side wall of the gantry mounting frame, one end of the reciprocating pull plate is fixedly connected to a closed bonding plate, the upper surface of the closed bonding plate is bonded to the bottom end of the discharge connecting pipe, a feed port is provided on the top of the powder screening box, the discharge connecting pipe is located above the feed port, and a power assembly for driving the reciprocating pull plate to move back and forth is installed on one side of the gantry mounting frame.

[0009] Preferably, the power assembly includes a connecting side plate fixedly connected to one side of the gantry mounting frame, the lower surface of the connecting side plate is fixedly connected to a first servo motor, the output shaft of the first servo motor is fixedly connected to a rotating movable disk, the lower surface of the rotating movable disk is rotatably connected to a linked reciprocating pull rod at an eccentric position, and the linked reciprocating pull rod is rotatably connected to the reciprocating movable pull plate at one end away from the rotating movable disk.

[0010] Preferably, the drive assembly includes a second servo motor fixedly connected to the rear side of the powder screening box, the output shaft of the second servo motor is fixedly connected to the first pulley, the outer surface of the rotating air intake duct is fixedly connected to the second pulley, and the first pulley and the second pulley are connected via a first belt drive.

[0011] Preferably, the blowing assembly includes an installed air pump fixedly connected to the rear side of the powder screening box, the inlet of the installed air pump is fixedly connected to the second fixed pipe, the outlet of the installed air pump is fixedly connected to the first fixed pipe, the end of the first fixed pipe away from the installed air pump is rotatably connected to one end of a rotating air inlet pipe, the interior of the hollow installed pipe is provided with four built-in connecting pipes arranged in a circular array, one end of the built-in connecting pipe is fixedly connected to the rotating air inlet pipe, the other end of the built-in connecting pipe is connected to the corresponding material receiving transfer plate, and valves are provided on the four built-in connecting pipes.

[0012] Preferably, the first knocking assembly includes a third servo motor installed inside the trapezoidal material guide table, the output shaft of the third servo motor is fixedly connected to the second rotating rod body, and the outer surface of the second rotating rod body is fixedly connected to the second knocking rubber block.

[0013] Preferably, the second knocking assembly includes a first rotating rod body that is rotatably connected to the rear side of the powder screening box, a first knocking rubber block is fixedly connected to the outer surface of the first rotating rod body, the first knocking rubber block is located inside the powder screening box, and a third pulley is fixedly connected to one end of the first rotating rod body located outside the powder screening box, a fourth pulley is fixedly connected to the outer surface of the rotating air intake pipe, and the third pulley and the fourth pulley are connected via a second belt drive.

[0014] Preferably, a first discharge opening is provided on one side of the bottom of the powder screening box, and a second discharge opening is provided on the other side of the bottom of the powder screening box.

[0015] A screening method for a cemented carbide powder granulation screening machine, the screening method comprising the following steps:

[0016] S1. Powder to be granulated is put into the fixed material storage cylinder. The powder enters the material discharge connection pipe through the fixed material storage cylinder. Then the first servo motor is started. The output shaft of the first servo motor rotates with the rotating movable disc. When the rotating movable disc rotates, the reciprocating movable pull plate is pulled back and forth by the linkage reciprocating pull rod, so that the reciprocating movable pull plate pulls the closed bonding plate to move. When the closed bonding plate is separated from the material discharge connection pipe, the material discharge connection pipe is opened, and the powder in the material discharge connection pipe falls, and falls onto the surface of one of them through the feed port, so as to realize intermittent material discharge.

[0017] S2, then start the second servo motor, the output shaft of the second servo motor rotates with the first pulley, the first belt rotates the rotating air intake pipe, the rotating air intake pipe rotates with the hollow installation pipe, the hollow installation pipe rotates with the four material receiving transfer plates, while the material receiving transfer plate rotates, start the installation air pump, the air enters the interior of the rotating air intake pipe through the first fixed pipe, then open the valve on the corresponding built-in connecting pipe, the built-in connecting pipe is connected with the material receiving transfer plate with powder, the air is instantly blown out through the breathable mesh plate, so that the powder is blown out obliquely and falls onto the screening filter in a parabolic shape;

[0018] S3, while the rotating air intake pipe rotates, the first rotating rod body is rotated by the second belt, and the first rotating rod body rotates with the first knocking rubber block, so that the first knocking rubber block knocks the screening filter to speed up the screening of powder;

[0019] S4. Qualified powder passes through the screening filter and falls to the upper left side of the trapezoidal material guide platform, and unqualified powder falls to the upper right side of the trapezoidal material guide platform. At the same time, the two third servo motors are started, and the output shaft of the third servo motor rotates the second rotating rod body, and the second rotating rod body rotates the second knocking rubber block, so that the second knocking rubber block continuously knocks the inside of the trapezoidal material guide platform, causing the trapezoidal material guide platform to vibrate, thereby accelerating the discharge of powder from the first discharge port and the second discharge port respectively.

[0020] (III) Beneficial effects

[0021] The present invention provides a cemented carbide powder granulation screening machine and screening method, which have the following beneficial effects:

[0022] 1. The present invention starts the second servo motor, and the output shaft of the second servo motor rotates with the first pulley, so that the hollow installation pipe rotates with the four material receiving transfer plates, and the installation air pump is started at the same time, and the air enters the interior of the rotating air inlet pipe through the first fixed pipe, and then the valve on the corresponding built-in connecting pipe is opened, and the air is blown out instantly through the breathable mesh plate, so that the powder is blown out obliquely and falls onto the screening filter net in a parabolic shape. During the powder blowing and throwing process, the parabolas formed by large particles and small particles are different. Therefore, the powder has undergone a preliminary screening before falling onto the screening filter net, thereby ensuring the subsequent efficient screening operation.

[0023] 2. The present invention starts the first servo motor, and the output shaft of the first servo motor rotates with the rotating movable disk. When the rotating movable disk rotates, the reciprocating movable pull plate is pulled back and forth by the linked reciprocating pull rod, so that the reciprocating movable pull plate pulls the closed bonding plate to move. When the closed bonding plate is separated from the unloading connecting pipe, the unloading connecting pipe is opened, and the powder in the unloading connecting pipe falls, and falls onto the surface of one of them through the feed port, thereby realizing intermittent unloading, avoiding large accumulation of powder, and being less prone to blockage.

[0024] 3. The present invention starts two third servo motors, and the output shaft of the third servo motor rotates the second rotating rod, and the second rotating rod rotates the second knocking rubber block, so that the second knocking rubber block continuously knocks the inside of the trapezoidal material guide table, causing the trapezoidal material guide table to vibrate, thereby accelerating the discharge of powder from the first discharge port and the second discharge port, respectively, which is conducive to the discharge of qualified powder and unqualified powder, and is not prone to accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a cemented carbide powder granulation and screening machine provided by the present invention from a first perspective;

[0026] Figure 2 A schematic diagram of the stereoscopic structure of a cemented carbide powder granulating and screening machine provided by the present invention from a second viewing angle;

[0027] Figure 3 A cross-sectional view of a powder screening box of a cemented carbide powder granulating and screening machine provided by the present invention;

[0028] Figure 4 A schematic diagram of the internal structure of a powder screening box of a cemented carbide powder granulation and screening machine provided by the present invention;

[0029] Figure 5 A schematic diagram of the hollow installation pipeline structure of a cemented carbide powder granulation and screening machine provided by the present invention;

[0030] Figure 6 A schematic diagram of the structure of the built-in connecting pipeline of a cemented carbide powder granulating and screening machine provided by the present invention;

[0031] Figure 7 A hard alloy powder granulation screening machine provided by the present invention Figure 2 -Schematic diagram of the enlarged structure of A.

[0032] Among them, 1. powder screening box; 2. gantry mounting frame; 3. material unloading connecting pipe; 4. material storage fixed cylinder; 5. connecting side plate; 6. first servo motor; 7. rotating movable disc; 8. linked reciprocating pull rod; 9. reciprocating movable pull plate; 10. closed laminating plate; 11. rotating air intake pipe; 12. hollow mounting pipe; 13. material receiving transfer plate; 14. breathable mesh plate; 15. installing air pump; 16. first fixed pipe; 17. second servo motor; 18. screening filter; 19. first rubber sheet; 20. second rubber sheet; 21. first rotating rod body; 22. first knocking rubber block; 23. built-in connecting pipe; 24. second rotating rod body; 25. second knocking rubber block; 26. trapezoidal material guide table; 27. first discharge port; 28. second discharge port; 29. ​​third servo motor. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example:

[0035] like Figure 1-7 As shown, an embodiment of the present invention provides a cemented carbide powder granulation screening machine, comprising a powder screening box 1, a gantry mounting frame 2 is fixedly connected to the top of the powder screening box 1, a material discharge connection pipe 3 is fixedly connected to the top of the gantry mounting frame 2, a material storage fixed cylinder 4 is fixedly connected to the top of the material discharge connection pipe 3, a first discharge port 27 is provided on one side of the bottom of the powder screening box 1, and a second discharge port 28 is provided on the other side of the bottom of the powder screening box 1;

[0036] A blocking component is provided on one side of the gantry mounting frame 2, and the blocking component includes a reciprocating pull plate 9 inserted through the side wall of the gantry mounting frame 2, one end of the reciprocating pull plate 9 is fixedly connected to a closed bonding plate 10, the upper surface of the closed bonding plate 10 is bonded to the bottom end of the material discharge connecting pipe 3, a feed port is provided on the top of the powder screening box 1, and the material discharge connecting pipe 3 is located above the feed port, and a power component for driving the reciprocating pull plate 9 to reciprocate is installed on one side of the gantry mounting frame 2, and the power component includes a connecting side plate 5 fixedly connected to one side of the gantry mounting frame 2, and the lower surface of the connecting side plate 5 is fixedly connected to a first servo motor 6, and the first servo motor 6 is fixedly connected to the lower surface of the connecting side plate 5. The output shaft of a servo motor 6 is fixedly connected to a rotating movable disc 7, and the lower surface eccentrically connected to a linkage reciprocating pull rod 8, and the end of the linkage reciprocating pull rod 8 away from the rotating movable disc 7 is rotatably connected to the reciprocating pull plate 9. The first servo motor 6 is started, and the output shaft of the first servo motor 6 rotates with the rotating movable disc 7. When the rotating movable disc 7 rotates, the reciprocating pull plate 9 is pulled back and forth by the linkage reciprocating pull rod 8, so that the reciprocating pull plate 9 pulls the closed bonding plate 10 to move. When the closed bonding plate 10 is separated from the unloading connecting pipe 3, the unloading connecting pipe 3 is opened, and the powder in the unloading connecting pipe 3 falls off;

[0037] A rotating air intake pipe 11 is rotatably connected through the rear side of the powder screening box 1, and a driving assembly for driving the rotating air intake pipe 11 to rotate is installed on the rear side of the powder screening box 1. The driving assembly includes a second servo motor 17 fixedly connected to the rear side of the powder screening box 1, and the output shaft of the second servo motor 17 is fixedly connected to the first pulley, and the outer surface of the rotating air intake pipe 11 is fixedly connected to the second pulley, and the first pulley and the second pulley are connected through a first belt transmission. The second servo motor 17 is started, and the output shaft of the second servo motor 17 rotates with the first pulley, and the rotating air intake pipe 11 rotates through the first belt, and the rotating air intake pipe 11 rotates with the hollow installation pipe 12, and the hollow installation pipe 12 rotates with four material receiving transfer plates 13;

[0038] One end of the rotating air intake pipe 11 located inside the powder screening box 1 is fixedly connected to a hollow mounting pipe 12, and the outer surface of the hollow mounting pipe 12 is fixedly connected to four material receiving transfer plates 13 arranged in a circular array, the interior of the material receiving transfer plate 13 is hollow, and a breathable mesh plate 14 is fixedly embedded on the surface of the material receiving transfer plate 13, and a blowing assembly connected to the rotating air intake pipe 11 is installed on the rear side of the powder screening box 1, and the blowing assembly includes an installation air pump 15 fixedly connected to the rear side of the powder screening box 1, the inlet of the installation air pump 15 is fixedly connected to a second fixed pipe, and the outlet of the installation air pump 15 is fixedly connected to a first fixed pipe 16, and the end of the first fixed pipe 16 away from the installation air pump 15 is connected to the rotating air intake pipe One end of the pipe 11 is rotatably connected, and four built-in connecting pipes 23 arranged in a circular array are arranged inside the hollow installation pipe 12. One end of the built-in connecting pipe 23 is fixedly connected to the rotating air intake pipe 11, and the other end of the built-in connecting pipe 23 is connected to the corresponding material receiving transfer plate 13. Valves are arranged on the four built-in connecting pipes 23. The installation air pump 15 is started, and air enters the interior of the rotating air intake pipe 11 through the first fixed pipe 16. Then, the valve on the corresponding built-in connecting pipe 23 is opened, and this built-in connecting pipe 23 is connected with the material receiving transfer plate 13 with powder. The air is blown out instantly through the air permeable mesh plate 14, so that the powder is blown out obliquely and falls onto the screening filter 18 in a parabolic shape;

[0039] A trapezoidal material guide platform 26 is fixedly connected to the inner bottom of the powder screening box 1, and two groups of first knocking components are arranged inside the trapezoidal material guide platform 26. The first knocking component includes a third servo motor 29 installed inside the trapezoidal material guide platform 26, and the output shaft of the third servo motor 29 is fixedly connected to the second rotating rod body 24, and the outer surface of the second rotating rod body 24 is fixedly connected to the second knocking rubber block 25. The two third servo motors 29 are started, and the output shaft of the third servo motor 29 rotates the second rotating rod body 24, and the second rotating rod body 24 rotates the second knocking rubber block 25, so that the second knocking rubber block 25 continuously knocks the inside of the trapezoidal material guide platform 26, so that the trapezoidal material guide platform 26 vibrates;

[0040] The top of the trapezoidal material guide platform 26 is fixedly connected with a second rubber sheet 20, and one end of the second rubber sheet 20 away from the trapezoidal material guide platform 26 is fixedly connected with a screening filter 18, and one end of the screening filter 18 away from the second rubber sheet 20 is fixedly connected with a first rubber sheet 19, and one end of the first rubber sheet 19 away from the screening filter 18 is fixedly connected to the inner top of the powder screening box 1, and a second knocking assembly adapted to the screening filter 18 is installed on the rear side of the powder screening box 1, and the second knocking assembly includes a first rotating rod body 21 that penetrates and rotates and is connected to the rear side of the powder screening box 1. A first knocking rubber block 22 is fixedly connected to the outer surface of the rotating rod body 21, and the first knocking rubber block 22 is located inside the powder screening box 1. A third pulley is fixedly connected to one end of the first rotating rod body 21 located outside the powder screening box 1, and a fourth pulley is fixedly connected to the outer surface of the rotating air intake pipe 11. The third pulley and the fourth pulley are connected through a second belt transmission. The first rotating rod body 21 is rotated by the second belt, and the first rotating rod body 21 rotates with the first knocking rubber block 22, so that the first knocking rubber block 22 knocks on the screening filter 18 to speed up the screening of powder.

[0041] A screening method for a cemented carbide powder granulation screening machine, the screening method comprising the following steps:

[0042] S1. Powder to be granulated is put into the fixed material storage cylinder 4. The powder enters the material discharge connecting pipe 3 through the fixed material storage cylinder 4. Then the first servo motor 6 is started. The output shaft of the first servo motor 6 rotates the rotating movable disc 7. When the rotating movable disc 7 rotates, the reciprocating movable pull plate 9 is pulled back and forth through the linkage reciprocating pull rod 8, so that the reciprocating movable pull plate 9 pulls the closed bonding plate 10 to move. When the closed bonding plate 10 is separated from the material discharge connecting pipe 3, the material discharge connecting pipe 3 is opened, and the powder in the material discharge connecting pipe 3 falls, and falls onto the surface of one of them through the feed port, so as to realize intermittent material discharge;

[0043] S2, then start the second servo motor 17, the output shaft of the second servo motor 17 rotates with the first pulley, and the rotating air intake pipe 11 rotates through the first belt, the rotating air intake pipe 11 rotates with the hollow installation pipe 12, and the hollow installation pipe 12 rotates with the four material receiving transfer plates 13. While the material receiving transfer plate 13 rotates, start the installation air pump 15, and the air enters the interior of the rotating air intake pipe 11 through the first fixed pipe 16, and then open the valve on the corresponding built-in connecting pipe 23, the built-in connecting pipe 23 is connected with the material receiving transfer plate 13 with powder, and the air is blown out instantly through the breathable mesh plate 14, so that the powder is blown out obliquely and falls onto the screening filter 18 in a parabolic shape;

[0044] S3, while the rotating air intake pipe 11 rotates, the first rotating rod 21 is rotated by the second belt, and the first rotating rod 21 rotates with the first knocking rubber block 22, so that the first knocking rubber block 22 knocks the screening filter 18 to speed up the screening of powder;

[0045] S4. Qualified powder passes through the screening filter 18 and falls to the upper left side of the trapezoidal material guide platform 26, and unqualified powder falls to the upper right side of the trapezoidal material guide platform 26. At the same time, the two third servo motors 29 are started, and the output shaft of the third servo motor 29 rotates the second rotating rod 24, and the second rotating rod 24 rotates the second knocking rubber block 25, so that the second knocking rubber block 25 continuously knocks the inside of the trapezoidal material guide platform 26, causing the trapezoidal material guide platform 26 to vibrate, thereby accelerating the discharge of powder from the first discharge port 27 and the second discharge port 28 respectively.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprising a reference structure" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cemented carbide powder granulation and screening machine, comprising a powder screening box (1), characterized in that: The top of the powder screening box (1) is fixedly connected to a gantry mounting frame (2), the top of the gantry mounting frame (2) is penetrated and fixedly connected to a material discharge connection pipe (3), the top of the material discharge connection pipe (3) is fixedly connected to a material storage fixed cylinder (4), one side of the gantry mounting frame (2) is provided with a blocking component, the rear side of the powder screening box (1) is penetrated and rotatably connected to a rotating air intake pipe (11), the rear side of the powder screening box (1) is provided with a driving component for driving the rotating air intake pipe (11) to rotate, one end of the rotating air intake pipe (11) located inside the powder screening box (1) is fixedly connected to a hollow mounting pipe (12), the outer surface of the hollow mounting pipe (12) is fixedly connected to four material receiving transfer plates (13) arranged in a ring array, and the surface of the material receiving transfer plate (13) is fixedly embedded with a breathable mesh plate ( 14), an air blowing assembly connected to the rotating air inlet pipe (11) is installed on the rear side of the powder screening box (1), a trapezoidal material guide platform (26) is fixedly connected to the inner bottom of the powder screening box (1), two groups of first knocking assemblies are arranged inside the trapezoidal material guide platform (26), a second rubber sheet (20) is fixedly connected to the top of the trapezoidal material guide platform (26), an end of the second rubber sheet (20) away from the trapezoidal material guide platform (26) is fixedly connected to a screening filter (18), an end of the screening filter (18) away from the second rubber sheet (20) is fixedly connected to a first rubber sheet (19), an end of the first rubber sheet (19) away from the screening filter (18) is fixedly connected to the inner top of the powder screening box (1), and a second knocking assembly compatible with the screening filter (18) is installed on the rear side of the powder screening box (1); The blocking component comprises a reciprocating pull plate (9) inserted through the side wall of the gantry mounting frame (2), one end of the reciprocating pull plate (9) is fixedly connected to a closed bonding plate (10), the upper surface of the closed bonding plate (10) is bonded to the bottom end of the material discharge connection pipe (3), a feed port is provided on the top of the powder screening box (1), the material discharge connection pipe (3) is located above the feed port, and a power component for driving the reciprocating pull plate (9) to move back and forth is installed on one side of the gantry mounting frame (2); The power assembly comprises a connecting side plate (5) fixedly connected to one side of the gantry mounting frame (2); a first servo motor (6) is fixedly connected to the lower surface of the connecting side plate (5); an output shaft of the first servo motor (6) is fixedly connected to a rotating movable disc (7); a linkage reciprocating pull rod (8) is rotatably connected to an eccentric portion of the lower surface of the rotating movable disc (7); an end of the linkage reciprocating pull rod (8) away from the rotating movable disc (7) is rotatably connected to a reciprocating movable pull plate (9); The driving assembly comprises a second servo motor (17) fixedly connected to the rear side of the powder screening box (1), the output shaft of the second servo motor (17) is fixedly connected to a first belt pulley, the outer surface of the rotating air intake duct (11) is fixedly connected to a second belt pulley, and the first belt pulley is connected to the second belt pulley via a first belt transmission; The air blowing assembly comprises an installation air pump (15) fixedly connected to the rear side of the powder screening box (1), the inlet of the installation air pump (15) is fixedly connected to a second fixed pipe, the outlet of the installation air pump (15) is fixedly connected to a first fixed pipe (16), one end of the first fixed pipe (16) away from the installation air pump (15) is rotatably connected to one end of a rotating air inlet pipe (11), and four built-in connecting pipes (23) arranged in a circular array are arranged inside the hollow installation pipe (12), one end of the built-in connecting pipe (23) is fixedly connected to the rotating air inlet pipe (11), and the other end of the built-in connecting pipe (23) is connected to a corresponding material receiving transfer plate (13), and valves are arranged on the four built-in connecting pipes (23).

2. A cemented carbide powder granulating and screening machine according to claim 1, characterized in that: The first knocking assembly comprises a third servo motor (29) installed inside the trapezoidal material guide platform (26), the output shaft of the third servo motor (29) is fixedly connected to the second rotating rod body (24), and the outer surface of the second rotating rod body (24) is fixedly connected to the second knocking rubber block (25).

3. A cemented carbide powder granulating and screening machine according to claim 2, characterized in that: The second knocking assembly comprises a first rotating rod (21) which is rotatably connected to the rear side of the powder screening box (1); a first knocking rubber block (22) is fixedly connected to the outer surface of the first rotating rod (21); the first knocking rubber block (22) is located inside the powder screening box (1); a third belt pulley is fixedly connected to one end of the first rotating rod (21) located outside the powder screening box (1); a fourth belt pulley is fixedly connected to the outer surface of the rotating air intake duct (11); and the third belt pulley and the fourth belt pulley are connected via a second belt transmission.

4. A cemented carbide powder granulating and screening machine according to claim 3, characterized in that: A first discharge opening (27) is provided on one side of the bottom of the powder screening box (1), and a second discharge opening (28) is provided on the other side of the bottom of the powder screening box (1).

5. The screening method of a cemented carbide powder granulation screening machine according to claim 4, characterized in that: The screening method comprises the following steps: S1. Powder to be granulated is put into the interior of the material storage fixed cylinder (4). The powder enters the interior of the material discharge connection pipe (3) through the material storage fixed cylinder (4). Then, the first servo motor (6) is started. The output shaft of the first servo motor (6) drives the rotating movable disc (7) to rotate. When the rotating movable disc (7) rotates, the reciprocating movable pull plate (9) is pulled back and forth through the linkage reciprocating pull rod (8), so that the reciprocating movable pull plate (9) pulls the closed bonding plate (10) to move. When the closed bonding plate (10) is separated from the material discharge connection pipe (3), the material discharge connection pipe (3) is opened, and the powder in the material discharge connection pipe (3) falls, and falls through the feed port onto the surface of one of the receiving transfer plates (13), thereby realizing intermittent material discharge; S2, then start the second servo motor (17), the output shaft of the second servo motor (17) rotates with the first pulley, and the rotating air intake pipe (11) rotates through the first belt, the rotating air intake pipe (11) rotates with the hollow installation pipe (12), the hollow installation pipe (12) rotates with the four material receiving transfer plates (13), while the material receiving transfer plates (13) rotate, start the installation air pump (15), the air enters the interior of the rotating air intake pipe (11) through the first fixed pipe (16), and then open the valve on the corresponding built-in connecting pipe (23), the built-in connecting pipe (23) is connected with the material receiving transfer plate (13) with powder, the air is blown out instantly through the air permeable mesh plate (14), so that the powder is blown out obliquely and falls onto the screening filter (18) in a parabolic shape; S3, while the rotating air inlet pipe (11) rotates, the first rotating rod (21) is rotated by the second belt, and the first rotating rod (21) rotates with the first knocking rubber block (22), so that the first knocking rubber block (22) knocks the screening filter (18), thereby accelerating the screening of powder; S4. Qualified powder passes through the screening filter (18) and falls to the upper left side of the trapezoidal material guide platform (26), and unqualified powder falls to the upper right side of the trapezoidal material guide platform (26). At the same time, two third servo motors (29) are started, and the output shaft of the third servo motor (29) drives the second rotating rod (24) to rotate, and the second rotating rod (24) drives the second knocking rubber block (25) to rotate, so that the second knocking rubber block (25) continuously knocks the inside of the trapezoidal material guide platform (26), causing the trapezoidal material guide platform (26) to vibrate, thereby accelerating the discharge of the powder from the first discharge port (27) and the second discharge port (28).

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