Multi-layer powder pre-pressing forming system

Abstract

The invention relates to a multi-layer powder pre-pressing forming system which comprises a plurality of feeding mechanisms arranged side by side at intervals, a multi-degree-of-freedom mechanical arm, a pressing forming mechanism and an automatic slicking mechanism. The multi-degree-of-freedom manipulator is used for conveying powder on each feeding mechanism to the compression molding mechanism in sequence and collecting compression molded products; the automatic slicking mechanism comprises a three-axis moving platform capable of moving in a three-axis mode, a connecting arm arranged on the three-axis moving platform, and a circular-ring-shaped shielding piece fixedly connected to the bottom of the end, away from the three-axis moving platform, of the connecting arm. The S-shaped scraping strip is rotationally arranged in the shielding piece in a matched mode with the circular ring center of the shielding piece as the rotating center, and the bottom end of the S-shaped scraping strip is flush with the bottom end of the shielding piece; the connecting arm is further provided with a scraping plate which can vertically ascend and descend and is located on the outer side of the shielding piece. According to the invention, each layer of powder can be fed in sequence, and each layer of powder is stricken by using the automatic strickling mechanism and the scraper plate, so that the quality of a formed product is ensured.

Description

Technical Field

[0001] The invention relates to the field of powder material forming equipment, in particular to a multi-layer powder material pre-pressing forming system. Background Art

[0002] In the prior art, for the powder processing and molding process, the powder conveying device is mostly a conveying turntable, which is mostly driven by a rotary motor. The rotary motor usually has the defect of insufficient torque at low speed, which is easy to cause the turntable to swing and unstable operation. This defect is more likely to cause the powder to leak when conveying powdered materials; and when the powder is pressed and molded on the press (powder molding press), the commonly used leveling method is mostly vibration, which will cause uneven distribution of powder in the mold. The powder distribution in the middle of the mold is relatively dense, and the powder distribution at the edge is relatively sparse, especially for multi-layer powder pressing. In terms of industrial molding, one layer of powder is laid before another layer of powder. Such vibration will cause the powder between the layers to mix and reduce the difference between the layers. Therefore, a scraping device is used to scrape the powder. In the existing scraping device, the powder is easily scraped up during the scraping, and the scraped powder will fall on the scraped surface, and the flatness of the powder surface cannot be guaranteed. In addition, the powder is easily accumulated at the rotation center or edge. In the process of laying multiple layers of powder, it is not conducive to the laying of the next layer of powder. In this way, the consistency of each product cannot be guaranteed, resulting in poor product consistency. Summary of the invention

[0003] In view of the existing deficiencies, the present invention provides a multi-layer powder pre-pressing molding system.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a multi-layer powder pre-pressing molding system, including a plurality of feeding mechanisms, a multi-degree-of-freedom manipulator, a pressing molding mechanism with adjustable cavity depth and an automatic scraping mechanism arranged in parallel with each other; one of the feeding mechanisms is used to feed the required powder of one layer in the multi-layer powder; the multi-degree-of-freedom manipulator sequentially transports the powder loaded by each feeding mechanism to the pressing molding mechanism and collects the pressed and molded products from the pressing molding mechanism; the pressing molding mechanism is used to press and mold the powder; the automatic scraping mechanism includes a three-axis moving platform with three-axis movement, a connecting arm that can move on the three-axis moving platform, a circular shielding member fixedly connected to the bottom of the connecting arm away from the three-axis moving platform, and an S-shaped scraper arranged in the shielding member and rotating with the center of the shielding ring as the rotation center; the connecting arm is also provided with a scraper that can be vertically lifted and lowered on the outside of the shielding member at the end away from the three-axis moving platform.

[0005] Preferably, two scrapers are provided, and the two scrapers are located correspondingly at the end surface of the connecting arm away from the three-axis movable platform and the side surface adjacent to the end surface.

[0006] Preferably, the scraper is raised and lowered in the vertical direction by being driven by a lifting cylinder arranged on the connecting arm; a first motor is arranged at the end of the connecting arm away from the three-axis movable platform, and the shielding member is connected to the connecting arm via a top plate arranged on the top of the shielding member, and the output shaft of the first motor passes through the top plate and is connected to the scraper strip.

[0007] Preferably, the lower portion of the surface of the scraper away from the shielding member is an inclined surface extending downward and toward the adjacent shielding member.

[0008] Preferably, a workbench is further included, and each of the feeding mechanisms includes a material silo mounted on the workbench, a weighing sensor arranged on the workbench, a material cup that can be taken and placed on the weighing sensor, and a vibrating feeding mechanism arranged on the workbench for conveying powder from the material silo to the material cup.

[0009] Preferably, a conveyor belt for conveying molded products is provided on the workbench, and the multi-degree-of-freedom manipulator collects the pressed and molded products from the pressing and molding mechanism and transfers them to the conveyor belt.

[0010] Preferably, a transparent window is provided on the silo.

[0011] Preferably, the press-forming mechanism comprises a frame and a press mounted on the frame, wherein the lower die of the press comprises a movable die and a fixed die which can be lifted and lowered relative to each other; and the automatic scraping mechanism is spaced apart from the press on the frame.

[0012] Preferably, the multi-degree-of-freedom manipulator is provided with a clamping claw and a suction cup which can be used alternately at the free end.

[0013] Preferably, two of the press-forming mechanisms and the automatic scraping mechanisms are provided, and the feeding mechanism and the multi-degree-of-freedom manipulator are provided between the two press-forming mechanisms.

[0014] The beneficial effects of the present invention are as follows: the present invention can respectively weigh the required amount of each layer of powder through multiple feeding mechanisms, and then use a multi-degree-of-freedom manipulator to transfer the powder of each layer to the pressing and molding mechanism in sequence according to the number of layers of the powder, thereby avoiding the problem of leakage of the powder during transportation; the shielding member in the automatic leveling mechanism confines the powder to be leveled within the shielding member, thereby avoiding the flying of the powder, and at the same time the scraping strip can effectively avoid the accumulation of powder at the edge, and the scraper can level the accumulation in the middle, thereby improving the consistency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1is a schematic structural diagram of a pre-pressing molding system according to an embodiment of the present invention;

[0016] Figure 2 It is a structural schematic diagram of a feeding mechanism according to an embodiment of the present invention;

[0017] Figure 3 is a schematic structural diagram of a multi-degree-of-freedom manipulator according to an embodiment of the present invention;

[0018] Figure 4 Embodiment of the present invention Figure 3 A is a schematic diagram of the enlarged structure of the middle part;

[0019] Figure 5 It is a schematic structural diagram of a pressing and forming mechanism according to an embodiment of the present invention;

[0020] Figure 6 Embodiment of the present invention Figure 5 Schematic diagram of the enlarged structure of B

[0021] Figure 7 2 is a schematic structural diagram of an automatic scraping mechanism according to an embodiment of the present invention;

[0022] Names and serial numbers of parts in the figure: 1-feeding mechanism 10-workbench 11-bin 12-weighing sensor 13-material cup 14-vibrating feeding mechanism 15-conveyor belt 110-transparent window 2-multi-degree-of-freedom manipulator 20-gripper 21-suction cup 3-pressing molding mechanism 30-frame 31-press 310-upper mold 311-lower mold 312-mold cavity 4-automatic scraping mechanism 40-three-axis moving platform 41-connecting arm 42-shielding member 43-scraper strip 44-scraper 420-top plate 440-lifting cylinder. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments for a clear and complete description. Obviously, the embodiments described are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0024] Embodiments of the present invention Figures 1 to 7 As shown in , a multi-layer powder pre-pressing system comprises a plurality of feeding mechanisms 1 arranged in parallel at intervals, a multi-degree-of-freedom manipulator 2, a pressing and forming mechanism 3 with adjustable depth of a mold cavity 312, and an automatic scraping mechanism 4, wherein each mechanism is coordinated and operated through a PLC controller; Figure 2As shown in the figure, a feeding mechanism 1 is used for feeding a layer of powder required in a multi-layer powder. There are several feeding mechanisms 1 for several layers of powder. One feeding mechanism 1 feeds a layer of powder required into a material cup 13. A material cup 13 is filled with the amount of powder required for a layer of a molded product. For example, multiple feeding mechanisms 1 are arranged in sequence from left to right, the rightmost feeding mechanism 1 is used to feed the bottom layer of powder in the multi-layer powder, and the leftmost feeding mechanism 1 is used to feed the top layer of powder in the multi-layer powder. That is, the order of the multiple feeding mechanisms 1 from right to left corresponds to the order from bottom to top in the multi-layer powder. In this way, different layers of powder can be fed quickly and efficiently in the processing and molding of the multi-layer powder, thereby improving the production efficiency. Figure 3 and Figure 4 As shown in the figure, the multi-degree-of-freedom manipulator 2 transports the powders loaded by each feeding mechanism 1 to the pressing and molding mechanism 3 in turn and collects the pressed and molded products from the pressing and molding mechanism 3. The multi-degree-of-freedom manipulator 2 selects any existing manipulator that can move in multiple directions. On the one hand, it transfers the material cup 13 filled with powder to the pressing and molding mechanism 3, and on the other hand, it transfers the products pressed and molded in the pressing and molding mechanism 3. This means that the multi-degree-of-freedom manipulator 2 must have the functions of clamping and sucking, and can switch between clamping and sucking. At this time, the multi-degree-of-freedom manipulator 2 is provided with a clamping claw 20 and a suction cup 21 that can be used alternately at the free end. The free end is also the end of the multi-degree-of-freedom manipulator 2. At this time, a drive motor is rotatably set at the end of the multi-degree-of-freedom manipulator 2, and an installation is installed on the output shaft of the drive motor. The mounting seat is connected to the output shaft of the driving motor on the top surface, and then the suction cup 21 and the clamping claw 20 are installed on the opposite sides of the side or bottom surface of the mounting seat. The suction cup 21 adopts a vacuum suction cup, and the clamping claw 20 adopts a clamping claw cylinder. The driving motor is used to drive the mounting seat to rotate as needed, so that the suction cup 21 or the clamping claw 20 corresponds to the molded product to be sucked or the material cup 13 to be clamped. If a manipulator with 6 degrees of freedom is selected, the multi-degree-of-freedom manipulator 2 will clamp the material cup 13 filled with powder from right to left in sequence, transfer the powder to the pressing and molding mechanism and pour it into the mold cavity 312, and then put the material cup 13 back on the weighing sensor 12, and the multi-layer powder is pressed and molded in the pressing and molding mechanism 3 to obtain a molded product, and the molded product is sucked and taken away from the pressing and molding mechanism 3 by the multi-degree-of-freedom manipulator 2; Figure 5 and Figure 6As shown in the figure, the pressing and molding mechanism 3 is used to press and mold the powder. The pressing and molding mechanism 3 is a powder molding press, which is provided with a mold for pressing and molding the powder. The depth of the mold cavity 312 of the mold can be adjusted. In this way, when pre-pressing and molding multiple layers of powder, the depth of the mold cavity 312 can be adjusted to a depth equivalent to the thickness of the lowest layer of powder in the multiple layers of powder. Then, the lowest layer of powder is filled into the mold cavity 312, and then the automatic scraping mechanism 4 is used to scrape the lowest layer of powder flat. Then, the depth of the mold cavity 312 is increased and the upper layer of powder is filled and scraped flat. In sequence, multiple layers of powder are filled into the mold cavity 312 to ensure the consistency of each layer of powder. At this time, the pressing and molding mechanism 3 includes a frame 30 and a press 31 installed on the frame 30. The press 31 includes an upper mold 310 and a lower mold 311. The lower mold 311 of the press 31 includes a relatively movable mold 310. The movable mold and the fixed mold form a mold cavity 312 between the movable mold and the fixed mold. The depth of the mold cavity 312 is adjusted by lifting the movable mold relative to the fixed mold. The upper mold 310 is installed on the frame 30 and moves up and down by the drive of the upper mold motor or the upper mold cylinder (not shown in the figure) arranged on the frame 30, and then cooperates with the mold cavity 312 to complete the pre-pressing molding of the powder. The fixed mold in the lower mold 311 is fixedly installed on the frame 30, and the movable mold is movably installed on the frame 30 and moves up and down relative to the fixed mold by the drive of the lower mold motor or the lower mold cylinder (not shown in the figure) arranged on the frame 30. For example, the fixed mold is set as a cylindrical structure and an extension arm of a flat plate structure is extended radially outward from the outer edge of its top end. The top surface of the movable mold is a flat structure. The movable mold is slidably arranged inside the fixed mold from the lower end of the fixed mold. The top surface of the movable mold and the inside of the movable mold form a mold cavity, and the depth of the mold cavity is adjusted by lifting the movable mold in the fixed mold. Figure 1 and Figure 7As shown in the figure, the automatic scraping mechanism 4 is arranged on the frame 30 at a distance from the press 31. The automatic scraping mechanism 4 is arranged at a position on the frame 30 adjacent to the press 31, and the powder filled in the mold cavity 312 is scraped flat by the automatic scraping mechanism 4; the automatic scraping mechanism 4 includes a three-axis movable platform 40 for three-axis movement, a connecting arm 41 for three-axis movement arranged on the three-axis movable platform 40, a circular shielding member 42 fixedly connected to the bottom of the end of the connecting arm 41 away from the three-axis movable platform 40, and a shielding member 42 with the center of the circular ring of the shielding member 42 as the rotation center. The S-shaped scraper 43 is matched and rotated in the shielding member 42 and its bottom end is flush with the bottom end of the shielding member 42. The three-axis movable platform 40 is used to adjust the positions of the shielding member 42 and the scraper 43. The inner diameter of the shielding member 42 is adapted to the inner diameter of the fixed mold. The shielding member 42 can cover the top of the mold cavity 312 to prevent the scraper 43 from flying out when the powder is scraped and leveled. The bottom end of the shielding member 42 is flush with the bottom end of the scraper 43, so that when the shielding member 42 covers the mold cavity 312, the scraper 43 will not be suspended, so that the scraper 43 can be more The outer edge of the scraper strip 43 is in close contact with the powder filled in the mold cavity 312, and the outer edge of the scraper strip 43 is close to the inner wall of the shielding member 42, which can effectively avoid the accumulation of powder at the edge. In order to facilitate the alignment of the shielding member 42 and the mold cavity 312, a laser displacement sensor or an industrial camera can be set for positioning. For example, the laser displacement sensor is set in the area corresponding to the inside of the shielding member 42 on the bottom surface of the connecting arm 41. When the top plate 420 is set on the shielding member 42, the laser displacement sensor is set on the bottom surface of the top plate 420; the connecting arm 41 is moved away from the three-axis A scraper 44 which can be lifted and lowered vertically and is located outside the shielding member 42 is provided at one end of the platform 40. The scraper 44 is used to re-scrape the surface of the powder after being scraped and leveled by the scraper strip 43. The scraper 44 is used to lower the scraper 44 to contact the top surface of the extension arm after the scraper strip 43 has completed the leveling. The scraper strip 43 is separated from the contact with the powder. The connecting arm 41 is moved so that the scraper 44 slides over the top of the powder on the extension arm, thereby rotating the scraper strip 43 to scrape and level the surface of the powder after being scraped and leveled, thereby ensuring the flatness of the top of each layer of powder.

[0025] Further improvements, such as Figure 6 and Figure 7As shown in the figure, two scrapers 44 are provided, and the two scrapers 44 are located correspondingly at the end face of the connecting arm 41 away from the three-axis movable platform 40 and the side face adjacent to the end face, that is, the two scrapers 44 are arranged at an angle of 90 degrees, which can ensure that the scraper 44 can completely and thoroughly scrape and clean the top of the powder when the connecting arm 41 moves. If the three-axis movable platform 40 is arranged at the rear and the connecting arm 41 is extended forward, the two scrapers 44 are arranged at the front end and the left or right side of the connecting arm 41. As for the vertical lifting structure of the scraper 44, the scraper 44 is lifted and lowered in the vertical direction by the drive of the lifting cylinder 440 arranged on the connecting arm 41, that is to say, the lifting cylinder 440 is arranged on the connecting arm 41, and then the scraper 44 is installed on the piston rod of the lifting cylinder 440, and the lifting and lowering of the scraper 44 is driven by the lifting cylinder 440 to the piston rod; the connecting arm 41 is provided with a first motor (not shown in the figure) at the end away from the three-axis moving platform 40, and the shielding member 42 is connected to the connecting arm 41 through a top plate 420 arranged on the top of the shielding member 42, and the output shaft of the first motor passes through the top plate 420 and is connected to the scraper strip 43. At this time, When a cavity is provided in the part, the first motor is arranged in the cavity. If there is no cavity, the first motor is arranged on the top of the connecting arm 41, and the output shaft of the first motor is downward. The top plate 420 and the shielding member 42 are formed integrally. The top plate 420 closes the top of the shielding member 42 and the top plate 420 is installed on the bottom surface of the connecting arm 41 to facilitate the installation of the shielding member 42 on the bottom surface of the connecting arm 41. At this time, the output shaft of the first motor must pass through the top plate 420 to be connected with the scraper 43. A top plate through hole is provided on the top plate 420, and then a bearing is installed in the top plate through hole. The output shaft of the first motor is installed in the inner ring of the bearing, and then the scraper 43 is connected to the output shaft of the first motor. As for the structure of the scraper 44, the lower part of the surface of the scraper 44 on the side away from the shielding member 42 is an inclined surface extending downward and toward the adjacent shielding member 42. This reduces the area of ​​the bottom surface of the scraper 44, that is, reduces the contact surface between the scraper 44 and the powder, facilitates the scraper 44 to level the powder, and prevents the scraper 44 from lifting the powder due to the excessive contact area during horizontal movement.

[0026] Further improvements, such as Figure 1 and Figure 2As shown in the figure, it also includes a workbench 10, each feeding mechanism 1 includes a silo 11 mounted on the workbench 10, a weighing sensor 12 arranged on the workbench 10, a material cup 13 that can be taken and placed on the weighing sensor 12, and a vibrating feeding mechanism 14 arranged on the workbench 10 for conveying the powder discharged from the silo 11 to the material cup 13. That is to say, the feeding mechanism 1 and the compression molding mechanism 3 are arranged separately, so that the feeding mechanism 1 and the compression molding mechanism 3 as well as the multi-degree-of-freedom mechanical device can be flexibly arranged according to the corresponding space. Hand 2; on the workbench 10, multiple feeding mechanisms 1 are arranged in sequence from left to right; for each feeding mechanism 1, a mounting frame is arranged on the workbench 10, and a silo 11 is installed on the top of the mounting frame. The silo 11 is arranged in a funnel-shaped structure, and a discharge port is arranged at the bottom of the silo 11. The top of the silo 11 is open and covered with a top cover. When in use, the required powder is filled in the silo 11 in advance, and then the top cover is covered; in order to facilitate observation of the amount of powder in the silo 11, a transparent window 110 is arranged on the silo 11 , the amount of powder stored in the silo 11 can be visually seen through the transparent window 110; at the same time, the vibrating feeding mechanism 14, that is, the vibrating feeder for conveying powder, is connected to the discharge port of the silo 14 on the workbench 10, and the powder in the silo 11 enters the vibrating feeder through the discharge port, and the vibrating feeder conveys the powder to the material cup 13. The weighing sensor 12 is used to weigh the powder entering the material cup 13, and the vibrating feeder stops feeding when the required weight of the powder is reached. For example, an electronic scale is used as a weighing sensor. The weighing sensor 12 weighs the powder; after the required powder is loaded in the material cup 13, the multi-degree-of-freedom manipulator 2 clamps the material cup 13 with the clamping claw, and then transfers the material cup 13 to the top of the mold cavity 312 of the press 31, and then pours the powder in the material cup 13 into the mold cavity 312. At this time, the top of the material cup 13 can be set to an inclined structure to facilitate the pouring of the powder into the mold cavity 312, and then the multi-degree-of-freedom manipulator 2 places the empty material cup 13 on the weighing sensor 12 for the next weighing and transportation. In order to facilitate the transportation of the molded product after compression molding, a conveyor belt 15 for conveying the molded product is provided on the workbench 10, such as first setting the conveyor belt 15 on the workbench 10, and then setting the base above the conveyor belt 15 on the workbench 10, and then setting the feeding mechanism 1 on the base, the multi-degree-of-freedom manipulator 2 collects the pressed and molded product from the compression molding mechanism 3 and transfers it to the conveyor belt 15, and uses the conveyor belt 15 to transport the molded product out.

[0027] Further improvements, such as Figure 1As shown in the figure, two pressing and forming mechanisms 3 and two automatic scraping and leveling mechanisms 4 are provided, and the feeding mechanism 1 and the multi-degree-of-freedom manipulator 2 are arranged between the two pressing and forming mechanisms 3, that is, a pressing and forming mechanism 3 is arranged on the left side of the feeding mechanism 1, and a pressing and forming mechanism 3 is also arranged on the right side of the feeding mechanism 1, and an automatic scraping and leveling mechanism 4 is arranged behind each pressing and forming mechanism 3, and a multi-degree-of-freedom manipulator 4 is arranged on the rear side of the feeding mechanism 1, so that multiple pressing and forming stations are formed, thereby improving production efficiency.

[0028] When in use, the PLC controller first controls the vibration feeding mechanism 14 to put the powder into the corresponding material cup 13, and controls the weighing sensor 12 to weigh the required amount of powder. After weighing, the vibration feeding mechanism 14 is stopped, and then the PLC controller starts the multi-degree-of-freedom manipulator 2 to clamp the material cup 13 and transfer the powder to the mold cavity 312. Then the PLC controller controls the three-axis mobile platform 40 to move the scraper 43 to the top of the mold cavity 312 for leveling. After the scraper 43 is leveled, the scraper 44 is lowered so that the scraper 44 is leveled again when the scraper 43 is removed from the top of the mold cavity 312. After performing the same operation on each layer of powder from bottom to top, the PLC controller starts the press 31 for pre-pressing. After pre-pressing, the movable mold ejects the molded product from the fixed mold, and then the multi-degree-of-freedom manipulator 2 uses the suction cup 21 to suck the molded product from the press 31 and transfer it to the conveyor belt 15 for transportation.

[0029] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A multi-layer powder pre-pressing molding system, characterized in that: It includes a plurality of feeding mechanisms, a multi-degree-of-freedom manipulator, a pressing and molding mechanism with adjustable cavity depth, and an automatic scraping and leveling mechanism arranged in parallel with each other; one of the feeding mechanisms is used for feeding the required powder of one layer among the multiple layers of powder; the multi-degree-of-freedom manipulator sequentially transports the powder loaded by each feeding mechanism to the pressing and molding mechanism and collects the pressed and molded products from the pressing and molding mechanism; the pressing and molding mechanism is used for pressing and molding the powder; the automatic scraping and leveling mechanism includes a three-axis movable platform with three-axis movement, a connecting arm arranged on the three-axis movable platform and capable of three-axis movement, a circular shielding member fixedly connected to the bottom of the connecting arm away from the three-axis movable platform, and an S-shaped scraping strip arranged in the shielding member and rotating with the center of the shielding ring as the rotation center and the bottom end of which is flush with the bottom end of the shielding member; the connecting arm is also provided with a scraper on the outside of the shielding member which can be lifted and lowered vertically at the end away from the three-axis movable platform.

2. The multi-layer powder pre-pressing molding system according to claim 1, characterized in that There are two scrapers, and the two scrapers are located correspondingly at the end surface of the connecting arm away from the three-axis movable platform and the side surface adjacent to the end surface.

3. The multi-layer powder pre-pressing molding system according to claim 1 or 2, characterized in that :The scraper is raised and lowered in the vertical direction by the drive of the lifting cylinder arranged on the connecting arm; the connecting arm is provided with a first motor at one end away from the three-axis moving platform, the shielding member is connected to the connecting arm through a top plate arranged on the top of the shielding member, and the output shaft of the first motor passes through the top plate and is connected to the scraper strip.

4. The multi-layer powder pre-pressing molding system according to claim 1 or 2, characterized in that The lower part of the scraper surface away from the shielding member is an inclined surface extending downward and toward the adjacent shielding member.

5. The multi-layer powder pre-pressing molding system according to claim 1, characterized in that: It also includes a workbench, and each of the feeding mechanisms includes a material bin mounted on the workbench, a weighing sensor arranged on the workbench, a material cup that can be taken and placed on the weighing sensor, and a vibrating feeding mechanism arranged on the workbench for conveying powder from the material bin to the material cup.

6. The multi-layer powder pre-pressing molding system according to claim 5, characterized in that: The workbench is provided with a conveyor belt for conveying the formed products, and the multi-degree-of-freedom manipulator collects the pressed and formed products from the pressing and forming mechanism and transfers them to the conveyor belt.

7. The multi-layer powder pre-pressing molding system according to claim 5, characterized in that : A transparent window is provided on the silo.

8. The multi-layer powder pre-pressing molding system according to claim 1, characterized in that :The pressing and forming mechanism includes a frame and a press installed on the frame, and the lower mold of the press includes a movable mold and a fixed mold that can be relatively lifted and lowered; the automatic scraping mechanism is arranged on the frame at a distance from the press.

9. The multi-layer powder pre-pressing molding system according to claim 1, characterized in that The multi-degree-of-freedom manipulator is provided with a clamping claw and a suction cup which can be used alternately at the free end.

10. The multi-layer powder pre-pressing molding system according to claim 1, characterized in that : There are two pressing and forming mechanisms and two automatic scraping and leveling mechanisms, and the feeding mechanism and the multi-degree-of-freedom manipulator are arranged between the two pressing and forming mechanisms.

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