Vacuum drop and spread device and method for cemented carbide powder

Abstract

The application provides a vacuum blanking and powder distributing device and method for cemented carbide powder, and relates to the technical field of powder metallurgy forming equipment. The device comprises a sealed box, a vacuum adjusting assembly, a cavity workbench, a feeding assembly, a lifting assembly, a powder distributing assembly and a controller. The vacuum adjusting assembly is in communication with a vacuum working cavity in the sealed box. The feeding assembly feeds powder in a fixed time and quantity through a conveying screw rod, and the blanking height is adjusted by the lifting assembly. The powder distributing assembly drives the shoe to reciprocate above a plurality of cavity molds through a translation motor. The application can reduce the influence of air resistance and cavity air resistance on powder filling, and realize the adjustment of blanking and powder distributing parameters.

Description

Technical Field

[0001] This invention relates to the field of powder metallurgy forming equipment technology, and more specifically, to a vacuum feeding and powder distribution device and method for cemented carbide powder. Background Technology

[0002] Hard alloys typically use refractory metal carbides such as tungsten carbide as the hard phase and metals such as cobalt and nickel as the binder phase, and are prepared using powder metallurgy. During the compression molding process, the uniformity of powder filling in the mold cavity directly affects the density distribution of the compact, and further affects the dimensional accuracy and mechanical properties of the sintered product.

[0003] Existing powder distribution devices mostly fill the cavity by allowing powder to fall freely and moving the material shoe under normal pressure. When the powder falls, it is easily affected by air resistance and airflow disturbance. For deep and narrow cavities, multi-step cavities and other complex cavities, the air inside the cavity is difficult to be discharged in time, which can easily form gas back pressure, causing unstable powder flow, local bridging, insufficient filling and uneven powder distribution.

[0004] Existing technologies typically improve the filling state by adjusting the hopper structure, dropping height, dropping speed, or adding vibration mechanisms, but these methods are insufficient to effectively reduce the effects of air resistance and cavity air resistance. Furthermore, existing devices lack the ability to adjust and coordinate the dropping height, dropping amount, dropping time, and shoe motion parameters, and are not convenient for independently detecting the powder filling amount in multiple cavities. Therefore, it is necessary to provide a vacuum powder feeding device and method for cemented carbide powder suitable for complex cavities. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a vacuum feeding and powder distribution device and method for cemented carbide powder.

[0006] The present invention adopts the following solution: This application provides a vacuum powder feeding and dispensing device for cemented carbide powder, including a sealed housing, a cavity worktable, a vacuum regulating assembly, a feeding assembly, a lifting assembly, a powder spreading assembly, a hose, and a controller; wherein, the interior of the sealed housing forms a vacuum working chamber, and a sealed door is provided on the sealed housing; the cavity worktable is located at the bottom of the vacuum working chamber, and multiple independent mold mounting positions are provided on the upper surface of the cavity worktable; the vacuum regulating assembly includes a vacuum pump, a vacuum pipeline, an extraction valve, a pressure gauge, and a vent valve, the vacuum pump is connected to the vacuum working chamber through the vacuum pipeline and the extraction valve, and the pressure gauge and the vent valve are respectively connected to the vacuum working chamber; The feeding assembly is located inside the vacuum working chamber and includes a storage hopper, a conveying screw, a conveying motor, and a discharge pipe. The conveying screw is located at the lower part of the storage hopper and communicates with the storage hopper. The conveying motor is driven by the conveying screw, and the discharge pipe is communicated with the conveying end of the conveying screw. The lifting assembly includes a vertical lead screw, a guide rail, a nut seat, a mounting bracket, and a lifting motor. The vertical lead screw and the guide rail are both arranged in the vertical direction. The nut seat is threadedly connected to the vertical lead screw and slidably connected to the guide rail. The mounting bracket is fixed to the nut seat. The feeding assembly is mounted on the mounting bracket. The lifting motor is drivenly connected to the vertical lead screw. The powder spreading assembly includes a motion track, a transmission screw, a slider, a translation motor, a connecting seat, and a material shoe. The motion track is located at the top of the vacuum working chamber. The transmission screw is arranged along the length of the motion track. The slider is threadedly connected to the transmission screw and slidably connected to the motion track. The translation motor is driven by the transmission screw. The material shoe is detachably mounted below the slider and above the cavity worktable via the connecting seat. One end of the flexible hose is detachably connected to the discharge pipe, and the other end is detachably connected to the inlet at the top of the material shoe; the controller is electrically connected to the conveying motor, the lifting motor, and the translation motor respectively. Furthermore, the sealed enclosure has a rectangular structure and is formed by enclosing an acrylic sheet; one side of the sealed door is rotatably connected to the sealed enclosure via a hinge, and the other side is connected to the sealed enclosure via at least two locking buckles; an annular sealing groove is provided on the periphery of the sealed door that contacts the sealed enclosure, and a rubber sealing ring is provided in the annular sealing groove; the sealed enclosure is provided with multiple pipe mounting holes, and the suction valve, the pressure gauge, and the vent valve are respectively connected to the vacuum working chamber through the corresponding pipe mounting holes, and a sealing joint or sealing gasket is provided in each pipe mounting hole.

[0007] Furthermore, the cavity worktable is supported on the bottom wall of the vacuum working chamber by four support columns; a cavity mold is detachably provided on each mold mounting position, and the cavity mold is connected to the corresponding mold mounting position through a positioning hole mating structure.

[0008] Furthermore, the storage hopper is funnel-shaped, wider at the top and narrower at the bottom; the conveying screw is arranged horizontally; and the conveying motor is located at one end of the conveying screw. The feeding assembly also includes a connecting plate, which is fixedly connected to the storage hopper and detachably mounted to the mounting bracket by bolts and nuts. The controller has a speed control terminal and a start / stop control terminal electrically connected to the conveying motor, and limits the speed and operating time of the conveying screw through the speed control terminal and the start / stop control terminal.

[0009] Furthermore, the lifting assembly also includes an upper fixed seat, a lower fixed seat, and bearings respectively disposed in the upper fixed seat and the lower fixed seat. The two ends of the vertical lead screw are rotatably connected to the upper fixed seat and the lower fixed seat respectively through the bearings. The guide slide rail is arranged parallel to the vertical lead screw, and the mounting bracket is L-shaped. The lifting assembly also includes a locking block fixedly connected to the nut seat and a locking handle threadedly connected to the locking block. The end of the locking handle passes through the locking block and abuts against the vertical lead screw. The two ends of the vertical lead screw are respectively provided with travel limit blocks located on the moving path of the nut seat. The lifting motor is a stepper motor and is coaxially connected to the vertical lead screw through a coupling.

[0010] Furthermore, the powder spreading assembly also includes two fixing plates, which are respectively fixed to the motion track and connected to the top wall of the sealed box by fasteners; both ends of the transmission screw are rotatably connected to the motion track by bearings, and the translation motor is located at one end of the motion track; the motion track is provided with an origin limit switch and a travel limit component, the origin limit switch is located on the movement path of the slider and is electrically connected to the controller, and the travel limit component is located at the end of the motion track; the connecting seat is provided with four positioning grooves, and the material shoe is provided with four connecting holes corresponding to the four positioning grooves, and the connecting seat and the material shoe are connected by fasteners passing through the connecting holes and the positioning grooves.

[0011] Furthermore, the signal input terminal of the controller is electrically connected to the origin limit switch; the first control output terminal of the controller is electrically connected to the conveyor motor, the second control output terminal is electrically connected to the lifting motor, and the third control output terminal is electrically connected to the translation motor; the controller outputs the start / stop signal and speed signal of the conveyor motor through the first control output terminal, outputs the direction signal, pulse signal, and speed signal of the lifting motor through the second control output terminal, and outputs the start / stop signal, direction signal, and speed signal of the translation motor through the third control output terminal.

[0012] By adopting the above technical solution, the present invention can achieve the following technical effects: A vacuum or low-pressure environment is established through a vacuum conditioning assembly to reduce air resistance and airflow disturbance during powder descent, and to mitigate gas back pressure within complex cavities. The conveying screw, conveying motor, and controller control the powder conveying speed and time, improving the consistency of material drop across different powder distribution processes. The height of the feeding assembly is adjusted via a vertical lead screw, nut seat, and guide rail, allowing the device to adapt to cavities of varying depths and structures. A translation motor drives the material shoe to reciprocate along a motion track, enabling scanning powder distribution across multiple cavities. Multiple independent mold mounting positions allow for separate disassembly and weighing of each cavity mold, facilitating comparison of powder filling amounts under different cavities or process parameters. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a vacuum powder feeding device for cemented carbide powder according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the box structure of a vacuum powder feeding and dispensing device for cemented carbide powder according to an embodiment of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the box structure of a vacuum powder feeding and dispensing device for cemented carbide powder according to an embodiment of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the cavity worktable structure of a vacuum feeding and powder dispensing device for cemented carbide powder according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the feeding assembly and lifting assembly of a vacuum powder feeding device for cemented carbide powder according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the powder spreading assembly structure of a vacuum powder feeding and spreading device for cemented carbide powder according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the material shoe in the powder spreading assembly of a vacuum powder feeding device for cemented carbide powder according to an embodiment of the present invention. Icons: 1. Sealed housing; 2. Vacuum pump; 3. Vacuum pipeline; 4. Ejection valve; 5. Vent valve; 6. Pressure gauge; 7. Cavity worktable; 8. Cavity mold; 9. Motion track; 10. Origin limit switch; 11. Translation motor; 12. Connecting seat; 13. Material shoe; 14. Hoist; 15. Storage hopper; 16. Lifting motor; 17. Vertical lead screw; 18. Mounting bracket; 19. Nut seat; 20. Locking block; 21. Locking handle; 22. Locking buckle; 23. First pipeline mounting hole; 24. Rubber sealing ring; 25. 26. Second pipe mounting hole; 27. Sealing door; 28. Hinge; 29. ​​Controller; 30. Instrument mounting hole; 31. Support column; 32. Mold mounting position; 33. Conveying screw; 34. Conveying motor; 35. Connecting plate; 36. First fastener; 37. Second fastener; 38. Upper fixed seat; 39. Lower fixed seat; 40. Guide slide rail; 41. Coupling; 42. Discharge pipe; 43. Slider; 44. Fixed plate; 45. Transmission screw; 46. Stroke limit component; 47. Positioning groove; 48. Connecting hole; 49. Feed inlet. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example Combination Figures 1 to 6 As shown, this embodiment provides a vacuum feeding and powder distribution device for cemented carbide powder, including a sealed box 1, a cavity worktable 7, a vacuum adjustment assembly, a feeding assembly, a lifting assembly, a powder spreading assembly, a hose 14, and a controller 28.

[0017] The sealed chamber 1 has a rectangular box structure, which encloses a vacuum working chamber. The sealed chamber 1 can be formed by enclosing a 40mm thick acrylic plate to withstand the pressure difference between the inside and outside of the vacuum working chamber and to facilitate observation of the powder falling and spreading process.

[0018] The sealing door 26 is rotatably connected to one side of the sealing housing 1 via a hinge 27. At least two locking latches 22 are provided on the other side of the sealing door 26. An annular sealing groove is provided around the periphery of the sealing door 26, and a rubber sealing ring 24 is installed within the annular sealing groove. When the locking latches 22 are locked, the sealing door 26 presses against the rubber sealing ring 24, thus keeping the sealing housing 1 sealed.

[0019] The sealed housing 1 is provided with a first pipeline mounting hole 23, a second pipeline mounting hole 25, and an instrument mounting hole 29. An exhaust valve 4 is installed in the first pipeline mounting hole 23, a vent valve 5 is installed in the second pipeline mounting hole 25, and a pressure gauge 6 is installed in the instrument mounting hole 29. Sealing joints or gaskets are provided between each mounting hole and its corresponding component.

[0020] In the vacuum regulating assembly, the vacuum pump 2 is located outside the sealed housing 1. One end of the vacuum pipeline 3 is connected to the vacuum pump 2, and the other end is connected to the vacuum working chamber via the evacuation valve 4. After the evacuation valve 4 is opened, the vacuum pump 2 extracts the gas from the vacuum working chamber. The pressure gauge 6 displays the pressure inside the vacuum working chamber, and after the vent valve 5 is opened, outside air enters the vacuum working chamber.

[0021] like Figure 4 As shown, the cavity worktable 7 is mounted on the bottom of the vacuum working chamber via four support columns 30. In this embodiment, the upper surface of the cavity worktable 7 is provided with three independent mold mounting positions 31, each of which mounts a cavity mold 8. A positioning hole mating structure is provided between the cavity mold 8 and the mold mounting position 31, allowing the cavity mold 8 to be repeatedly positioned and individually disassembled. The three cavity molds 8 may have the same or different cavity structures.

[0022] like Figure 5 As shown, the storage hopper 15 in the feeding assembly and lifting assembly is funnel-shaped, wider at the top and narrower at the bottom. The conveying screw 32 is horizontally positioned at the lower part of the storage hopper 15. The conveying motor 33 is located at one end of the conveying screw 32 and is connected to the conveying screw 32 in a driving connection. The discharge pipe 41 is connected to the conveying end of the conveying screw 32. The storage hopper 15 is mounted on the mounting bracket 18 via a connecting plate 34. The connecting plate 34 has multiple mounting holes, through which the first fastener 35 passes, detachably mounting the connecting plate 34 to the mounting bracket 18. The conveying motor 33 is electrically connected to the controller 28. The controller 28 adjusts the powder conveying amount and conveying time of the conveying screw 32 by controlling the rotational speed and operating time of the conveying motor 33.

[0023] The upper and lower ends of the vertical lead screw 17 are rotatably connected to the upper fixed seat 37 and the lower fixed seat 38 respectively via bearings. The guide rail 39 is arranged parallel to the vertical lead screw 17, and the nut seat 19 is threadedly connected to the vertical lead screw 17 and slidably connected to the guide rail 39.

[0024] The mounting bracket 18 is L-shaped and is fixed to the nut seat 19 by the second fastener 36. When the vertical screw 17 rotates, the nut seat 19 moves vertically under the restriction of the guide rail 39, and drives the mounting bracket 18 and the feeding assembly to rise and fall synchronously.

[0025] The locking block 20 is fixedly connected to the nut seat 19, and the locking handle 21 is threadedly connected to the locking block 20. After the feeding assembly moves to the set height, the locking handle 21 is rotated so that the end of the locking handle 21 abuts against the vertical lead screw 17, thereby restricting the movement of the nut seat 19. Both ends of the vertical lead screw 17 are also provided with travel limit blocks to limit the lifting range of the nut seat 19.

[0026] The lifting motor 16 is located at the lower end of the vertical lead screw 17, and its output shaft is coaxially connected to the vertical lead screw 17 via a coupling 40. The lifting motor 16 is preferably a stepper motor and is electrically connected to the controller 28. The controller 28 adjusts the moving direction, moving distance, and moving speed of the feeding assembly by outputting direction signals, pulse signals, and speed signals to the lifting motor 16.

[0027] like Figure 6 As shown, the motion track 9 of the powder spreading assembly is mounted on the top wall of the sealed housing 1 via two fixing plates 43. The transmission screw 44 is arranged along the length of the motion track 9, and its two ends are rotatably connected to the motion track 9 via bearings.

[0028] The slider 42 is threadedly connected to the lead screw 44 and slidably connected to the motion track 9. The translation motor 11 is located at one end of the motion track 9 and is connected to the lead screw 44 for transmission. When the translation motor 11 drives the lead screw 44 to rotate forward or reverse, the slider 42 moves back and forth along the motion track 9.

[0029] The motion track 9 is equipped with an origin limit switch 10 and a travel limit component 45. When the slider 42 moves to the origin limit switch 10, the origin limit switch 10 outputs an origin signal to the controller 28. The travel limit component 45 is located at the end of the motion track 9 to limit the movement range of the slider 42.

[0030] The material shoe 13 is mounted below the slider 42 via the connecting seat 12. The connecting seat 12 is provided with four positioning grooves 46, and the material shoe 13 is provided with four connecting holes 47. The connecting seat 12 and the material shoe 13 are detachably connected by fasteners passing through the positioning grooves 46 and connecting holes 47.

[0031] like Figure 7 As shown, a feed inlet 48 is provided at the top of the feed shoe 13. One end of the hose 14 is sleeved on the discharge pipe 41, and the other end is inserted into the feed inlet 48. The hose 14 can bend accordingly with the height of the feeding assembly and can be removed from the feed shoe 13 after the powder is discharged.

[0032] The controller 28 is electrically connected to the conveyor motor 33, the lifting motor 16, the translation motor 11, and the origin limit switch 10. The controller 28 controls the rotational speed and running time of the conveyor screw 32, the height of the feeding assembly, and the moving speed, travel distance, and reciprocating number of the material shoe 13.

[0033] The vacuum material feeding and powder distribution process in this embodiment is as follows.

[0034] First, install the three cavity molds 8 into their respective mold mounting positions 31, and load the cemented carbide powder into the storage hopper 15.

[0035] The dropping height is set by the controller 28, and the lifting motor 16 drives the vertical lead screw 17 to rotate, so that the nut seat 19 moves the feeding assembly to the set position. After adjustment, the movement of the nut seat 19 is restricted by the locking handle 21, and the hose 14 is connected to the discharge pipe 41 and the inlet 48 respectively.

[0036] Close the sealing door 26 and lock the locking buckle 22. Open the evacuation valve 4 and vacuum pump 2 to extract the gas from the vacuum working chamber, and monitor the pressure in the vacuum working chamber through the pressure gauge 6. When the pressure reaches the preset value, maintain the vacuum working chamber at the corresponding pressure.

[0037] The speed and running time of the conveying screw 32 are set by the controller 28, and the conveying motor 33 is started. The cemented carbide powder in the storage hopper 15 enters the discharge pipe 41 under the action of the conveying screw 32, and then enters the material shoe 13 through the hose 14.

[0038] After the material is fed, open the vent valve 5 to restore the vacuum working chamber to normal pressure. Open the sealing door 26 and pull the hose 14 out of the feed port 48 to avoid the hose 14 interfering with the reciprocating movement of the material shoe 13. Then close the sealing door 26 and evacuate the vacuum working chamber again to reach the preset pressure.

[0039] The slider 42 is moved to the origin limit switch 10, and the initial position of the slider 42 is determined according to the origin signal. The moving speed, moving stroke and reciprocating number of the material shoe 13 are set by the controller 28, and the translation motor 11 is started to make the material shoe 13 move back and forth along the motion track 9 and spread the powder into each cavity mold 8.

[0040] After powder application, turn off vacuum pump 2 and open vent valve 5 to restore the vacuum working chamber to normal pressure. Open sealing door 26, remove the three cavity molds 8 separately and weigh them independently to obtain the powder mass inside each cavity mold 8.

[0041] By changing the preset pressure in the vacuum working chamber, the material drop height of the feeding assembly, the rotation speed and running time of the conveying screw 32, the moving speed of the material shoe 13, and the number of reciprocations, and repeating the above process, the powder filling amount of each cavity mold 8 under different parameter conditions can be compared.

[0042] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A vacuum powder feeding and dispensing device for cemented carbide powder, characterized in that, The system includes a sealed housing, a cavity worktable, a vacuum regulating assembly, a material supply assembly, a lifting assembly, a powder spreading assembly, hoses, and a controller. The sealed housing forms a vacuum working chamber, and a sealed door is provided on the sealed housing. The cavity worktable is located at the bottom of the vacuum working chamber, and its upper surface has multiple independent mold mounting positions. The vacuum regulating assembly includes a vacuum pump, vacuum pipeline, a suction valve, a pressure gauge, and a vent valve. The vacuum pump is connected to the vacuum working chamber through the vacuum pipeline and the suction valve, and the pressure gauge and vent valve are also connected to the vacuum working chamber. The feeding assembly is located inside the vacuum working chamber and includes a storage hopper, a conveying screw, a conveying motor, and a discharge pipe. The conveying screw is located at the lower part of the storage hopper and communicates with the storage hopper. The conveying motor is driven by the conveying screw, and the discharge pipe is communicated with the conveying end of the conveying screw. The lifting assembly includes a vertical lead screw, a guide rail, a nut seat, a mounting bracket, and a lifting motor. The vertical lead screw and the guide rail are both arranged in the vertical direction. The nut seat is threadedly connected to the vertical lead screw and slidably connected to the guide rail. The mounting bracket is fixed to the nut seat. The feeding assembly is mounted on the mounting bracket. The lifting motor is drivenly connected to the vertical lead screw. The powder spreading assembly includes a motion track, a transmission screw, a slider, a translation motor, a connecting seat, and a material shoe. The motion track is located at the top of the vacuum working chamber. The transmission screw is arranged along the length of the motion track. The slider is threadedly connected to the transmission screw and slidably connected to the motion track. The translation motor is driven by the transmission screw. The material shoe is detachably mounted below the slider and above the cavity worktable via the connecting seat. One end of the hose is detachably connected to the discharge pipe, and the other end is detachably connected to the inlet at the top of the material shoe; the controller is electrically connected to the conveying motor, the lifting motor and the translation motor respectively.

2. The vacuum powder feeding device according to claim 1, characterized in that, The sealed enclosure is a rectangular box structure formed by an acrylic sheet. One side of the sealed door is rotatably connected to the sealed enclosure via a hinge, and the other side is connected to the sealed enclosure via at least two locking buckles. An annular sealing groove is provided on the periphery of the sealed door that contacts the sealed enclosure, and a rubber sealing ring is provided in the annular sealing groove. The sealed enclosure is provided with multiple pipe mounting holes, and the suction valve, the pressure gauge, and the vent valve are respectively connected to the vacuum working chamber through the corresponding pipe mounting holes. Each pipe mounting hole is provided with a sealing joint or a sealing gasket.

3. The vacuum powder feeding device according to claim 1, characterized in that, The cavity worktable is supported on the bottom wall of the vacuum working chamber by four support columns; each mold mounting position is detachably provided with a cavity mold, and the cavity mold and the corresponding mold mounting position are connected by a positioning hole mating structure.

4. The vacuum powder feeding device according to claim 1, characterized in that, The storage hopper is funnel-shaped, wider at the top and narrower at the bottom. The conveying screw is arranged horizontally, and the conveying motor is located at one end of the conveying screw. The feeding assembly also includes a connecting plate, which is fixedly connected to the storage hopper and detachably mounted to the mounting bracket by bolts and nuts. The controller has a speed control terminal and a start / stop control terminal electrically connected to the conveying motor, and limits the speed and running time of the conveying screw through the speed control terminal and the start / stop control terminal.

5. The vacuum material feeding and powder dispensing device according to claim 1, characterized in that, The lifting assembly further includes an upper fixed seat, a lower fixed seat, and bearings respectively disposed in the upper fixed seat and the lower fixed seat. The two ends of the vertical lead screw are rotatably connected to the upper fixed seat and the lower fixed seat through the bearings respectively. The guide slide rail is arranged parallel to the vertical lead screw, and the mounting bracket is L-shaped. The lifting assembly further includes a locking block fixedly connected to the nut seat and a locking handle threadedly connected to the locking block. The end of the locking handle passes through the locking block and abuts against the vertical lead screw. The two ends of the vertical lead screw are respectively provided with travel limit blocks located on the moving path of the nut seat. The lifting motor is a stepper motor and is coaxially connected to the vertical lead screw through a coupling.

6. The vacuum material feeding and powder distribution device according to claim 1, characterized in that, The powder spreading assembly also includes two fixing plates, which are respectively fixed to the motion track and connected to the top wall of the sealed box by fasteners; the two ends of the transmission screw are respectively rotatably connected to the motion track by bearings, and the translation motor is set at one end of the motion track; the motion track is provided with an origin limit switch and a travel limit component, the origin limit switch is located on the movement path of the slider and is electrically connected to the controller, and the travel limit component is set at the end of the motion track; the connecting seat is provided with four positioning grooves, and the material shoe is provided with four connecting holes corresponding to the four positioning grooves one by one, and the connecting seat and the material shoe are connected by fasteners passing through the connecting holes and the positioning grooves.

7. The vacuum material feeding and powder distribution device according to claim 6, characterized in that, The signal input terminal of the controller is electrically connected to the origin limit switch; the first control output terminal of the controller is electrically connected to the conveyor motor, the second control output terminal is electrically connected to the lifting motor, and the third control output terminal is electrically connected to the translation motor; the controller outputs the start / stop signal and speed signal of the conveyor motor through the first control output terminal, outputs the direction signal, pulse signal, and speed signal of the lifting motor through the second control output terminal, and outputs the start / stop signal, direction signal, and speed signal of the translation motor through the third control output terminal.

8. A vacuum feeding and powder distribution method for cemented carbide powder, characterized in that, The vacuum powder feeding device as described in any one of claims 1-7 includes the following steps: Multiple cavity molds are installed on the cavity worktable inside the vacuum working chamber, and cemented carbide powder is loaded into the storage hopper; The vertical screw is driven to rotate by the lifting motor, which causes the nut seat to move the feeding assembly in the vertical direction, adjusts the discharge pipe of the feeding assembly to the preset dropping height, and connects the discharge pipe to the material shoe through the hose; Close the sealing door and use a vacuum pump to extract the gas from the vacuum working chamber until the pressure inside the vacuum working chamber reaches the preset pressure. The conveying screw is controlled to rotate at a preset speed and a preset running time, so that the cemented carbide powder passes through the discharge pipe and the hose in sequence and enters the material shoe; The translation motor drives the transmission screw to rotate, causing the slider to move the material shoe back and forth above the cavity worktable, and the material shoe passes through multiple cavity molds in sequence; After the powder is applied, external gas is introduced into the vacuum working chamber through the vent valve to restore the vacuum working chamber to normal pressure, and then each cavity mold is removed.

9. The vacuum powder feeding method according to claim 8, characterized in that, After the cemented carbide powder enters the material shoe, the vent valve is opened to restore the vacuum working chamber to normal pressure, and the sealing door is opened; the connection between the hose and the material shoe is disconnected, the sealing door is closed, and the gas in the vacuum working chamber is extracted again until the pressure in the vacuum working chamber reaches the preset pressure; after the pressure in the vacuum working chamber reaches the preset pressure again, the material shoe is driven to move back and forth above the cavity worktable.

10. The vacuum powder feeding method according to claim 8, characterized in that, Before driving the shoe to reciprocate, the slider is moved to the origin limit switch, and the initial position of the slider is determined according to the signal output by the origin limit switch. The material shoe is controlled to pass through each cavity mold according to the preset moving speed, moving stroke and reciprocating number; After the powder is applied, each of the removed cavity molds is weighed independently to obtain the powder mass inside each cavity mold; at least one of the preset pressure, preset material drop height, rotation speed of the conveying screw, running time of the conveying screw, moving speed of the material shoe, and reciprocating number of the material shoe is changed, and the material drop and powder application are repeated.

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