Large-specification parallel discharge plasma sintering production equipment and production method

Abstract

The invention relates to large-specification parallel type discharge plasma sintering production equipment and a production method. The equipment comprises a mold, a powder distribution mechanism, a mold closing mechanism, a vacuum system, a discharging mechanism, a pressure mechanism, a feeding mechanism and a control system. The powder distribution mechanism, the discharging mechanism and the vacuum system are respectively arranged on one side of the mold closing mechanism; the mold comprises an upper mold and two lower molds, the two lower molds and the upper mold alternately form a mold set used for spark plasma sintering, the mold set moves between the mold closing mechanism and the vacuum system through the feeding mechanism, and the other lower mold used for powder pre-distribution moves among the discharging mechanism, the mold closing mechanism and the powder distribution mechanism through the feeding mechanism. And a pressure head of the pressure mechanism penetrates into the vacuum system from the upper end. The production efficiency and the productivity are improved, the product size limitation is broken through, a vacuum system is optimized, and the method belongs to the technical field of powder metallurgy and advanced material preparation equipment.

Description

Technical Field

[0001] This invention relates to powder metallurgy and advanced material preparation equipment, specifically to a large-scale parallel discharge plasma sintering production equipment, and also to a large-scale parallel discharge plasma sintering production method. Background Technology

[0002] Discharge plasma sintering technology is an advanced powder rapid densification technology, which is currently widely used in the research and development and small-batch production of high-performance ceramics, metal-ceramic composites, nanomaterials and special alloys.

[0003] Existing discharge plasma sintering production equipment is mainly designed for laboratory research or small-to-medium-sized sample prototyping. It is typically single-cavity, low-tonnage (usually below 100 tons), and operates manually or semi-automatically. The typical production process is as follows: manual powder loading → moving the mold into the vacuum chamber → manual mold closing and centering → vacuuming → performing the sintering process → cooling → vacuum breaking → manual mold opening and part removal. The entire process is intermittent, and a significant amount of auxiliary time is required between adjacent sintering cycles (such as material loading, mold closing, vacuuming, and vacuum breaking).

[0004] This existing technology has the following drawbacks: (1) Low production efficiency and difficulty in scaling up: All processes (powder loading, mold closing, sintering, and part removal) must be carried out in sequence, resulting in low equipment utilization, limited production capacity, and inability to meet the needs of continuous industrial production.

[0005] (2) Product size is limited: Traditional equipment integrates mold closing, pressurization and heating in a vacuum chamber. Due to the limited size of the equipment cavity (especially in the height direction), it is difficult and risky to perform precise alignment and mold closing operations on large molds in the vacuum chamber, making it difficult to stably produce ultra-large products (such as those with a diameter greater than 500mm).

[0006] (3) The vacuum system has high energy consumption and low efficiency: Each cycle requires a complete “vacuuming-vacuum breaking” process for the entire huge sintering cavity (including the pressure head mechanism). The pumping volume is large, the time is long, the energy consumption is huge, and frequent vacuum breaking can easily introduce pollution.

[0007] (4) Reliance on manual labor and poor consistency: It is highly dependent on the experience of operators, resulting in poor consistency, repeatability and reliability in terms of powder uniformity, mold positioning and process execution, which affects the stability of product quality.

[0008] Therefore, it is necessary to optimize the existing manual or semi-automatic operation modes. Summary of the Invention

[0009] To address the technical problems existing in the prior art, the purpose of this invention is to provide a large-scale parallel discharge plasma sintering production equipment and method to achieve efficient, stable, and quasi-continuous production of large-scale discharge plasma sintering products.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A large-scale parallel discharge plasma sintering production equipment includes a mold, a powder distribution mechanism, a mold closing mechanism, a vacuum system, a discharge mechanism, a pressure mechanism, a feeding mechanism, and a control system. The powder distribution mechanism, the discharge mechanism, and the vacuum system are respectively located on one side of the mold closing mechanism. The mold includes an upper mold and two lower molds, which alternately form a mold group for discharge plasma sintering with an upper mold. The mold group moves between the mold closing mechanism and the vacuum system via the feeding mechanism. Another lower mold for pre-powder distribution moves between the discharge mechanism, the mold closing mechanism, and the powder distribution mechanism via the feeding mechanism. The pressure head of the pressure mechanism enters the vacuum system from the top.

[0011] As a preferred embodiment, the vacuum system includes a vacuum transition chamber and a vacuum working chamber. The mold closing mechanism, the vacuum transition chamber, and the vacuum working chamber are arranged in sequence and in a row. An outer door is provided between the vacuum transition chamber and the mold closing mechanism, and an inner door is provided between the vacuum transition chamber and the vacuum working chamber. The vacuum working chamber is always kept in a vacuum state.

[0012] As a preferred embodiment, the outer door is controlled by a hydraulic rod to lift and lower, thereby opening and closing; the inner door is also controlled by a hydraulic rod to lift and lower, thereby opening and closing; when the mold assembly moves in and out between the vacuum transition chamber and the mold closing mechanism, the outer door is open and the inner door is closed; when the mold assembly moves in and out between the vacuum transition chamber and the vacuum working chamber, the outer door is closed, and the inner door is only opened when the vacuum transition chamber is in a vacuum state.

[0013] As a preferred embodiment, the vacuum transition chamber is connected to the vacuum pumping system, and the vacuum working chamber is also connected to the vacuum pumping system, with both the vacuum transition chamber and the vacuum working chamber being evacuated independently.

[0014] As a preferred embodiment, the pressure mechanism includes a main unit, a pressure head, and a lower electrode plate. The pressure head includes a connecting part and an upper electrode plate. The main unit is located above the vacuum chamber. The main unit is connected to the upper electrode plate through the connecting part and controls the lifting and lowering of the upper electrode plate. The connecting part passes through the vacuum chamber. The lower electrode plate is set in the vacuum chamber. The upper electrode plate and the lower electrode plate form a sintering space to accommodate the mold assembly.

[0015] As a preferred embodiment, the mold clamping mechanism includes a mold clamping frame and mechanical grippers. The mechanical grippers are mounted on the mold clamping frame and are used to raise or lower the upper mold, as well as to clamp or release the upper mold.

[0016] As a preferred embodiment, the side wall of the upper mold is provided with a recessed slot for mechanical grippers to hold it.

[0017] As a preferred embodiment, the feeding mechanism includes five feeding units: a powder distribution mechanism, a mold closing mechanism, a vacuum transition chamber, a vacuum working chamber, and a discharge mechanism, each with a feeding unit. In the powder distribution mechanism, mold closing mechanism, vacuum transition chamber, and discharge mechanism, the feeding unit includes a support plate for supporting the lower mold and a driving mechanism, and the driving mechanism drives the lower mold to translate between the support plates.

[0018] As a preferred option, a large-scale parallel discharge plasma sintering production equipment includes a control system, which controls the powder distribution mechanism, mold closing mechanism, vacuum system, material discharge mechanism, pressure mechanism, and feeding mechanism.

[0019] A large-scale parallel discharge plasma sintering production method, using large-scale parallel discharge plasma sintering production equipment, includes the following steps: S1: The lower mold includes a first lower mold and a second lower mold. While the first lower mold is located in the powder distribution mechanism to complete the pre-powder distribution, the second lower mold is located in the discharge mechanism. S2: The first lower mold is transferred to the mold closing mechanism to close with the upper mold to form a mold assembly; S3: The mold assembly is sent from the mold closing mechanism into the vacuum system, where discharge plasma sintering is performed in the vacuum chamber of the vacuum system; at the same time, after the mold assembly enters the vacuum system, the second lower mold is transferred from the material discharge mechanism to the powder distribution mechanism for pre-powder distribution. S4: Remove the sintered mold assembly from the vacuum system and return it to the mold closing mechanism to open the mold, so that the first lower mold moves to the discharge mechanism; S5: The second lower mold, which has been pre-powdered, is transferred to the mold closing mechanism to close with the upper mold to form a mold assembly; S6: Repeat steps S3 to S5 to alternately sinter and pre-powder distribution between the first and second lower molds.

[0020] The principle of this invention is: The discharge plasma sintering production line is optimized to form an automated line, allowing sintering and pre-powder distribution to be performed in parallel, thus improving production efficiency. The mold clamping mechanism and the main unit of the pressure mechanism are located outside the vacuum system, eliminating the need to occupy internal space and enabling the sintering of large-sized products. A small vacuum transition chamber is used for vacuuming and breaking, ensuring the vacuum chamber remains under vacuum, significantly improving work efficiency. The production line is automatically controlled by a control system.

[0021] The present invention has the following advantages: 1. Improve production efficiency and capacity: The dual-mold alternating operation design allows auxiliary processes such as powder application and preparation to be carried out in parallel with the core sintering process in the vacuum chamber, without having to completely overlap the auxiliary time in the production cycle, thus improving equipment utilization and overall capacity.

[0022] 2. Overcoming product size limitations: The design of vacuum outdoor mold closing moves the complex centering and mold closing operations to an unrestricted atmospheric pressure area, reducing the difficulty and risk of operating large-size molds and making it possible to produce ultra-large homogeneous materials.

[0023] 3. Optimized vacuum system for energy saving and efficiency improvement: A two-chamber linear arrangement structure with separate vacuum transition chamber and vacuum working chamber is adopted. The vacuum working chamber is always kept under vacuum during operation, and only the smaller vacuum transition chamber needs to be evacuated and devastated, which significantly reduces the pumping volume, time and energy consumption, while also reducing the risk of contamination introduced by frequent vacuum devastating.

[0024] 4. Ensure process consistency and product reliability: PLC control enables fully automated and intelligent operation of the entire process, including automatic powder distribution, precise mold positioning, and automatic execution of process routes, reducing human interference and ensuring process consistency and product reliability. Attached Figure Description

[0025] Figure 1 This is a perspective view of the device of the present invention.

[0026] Figure 2 This is a top view of the device of the present invention.

[0027] Figure 3 This is a cross-sectional view of the device of the present invention.

[0028] In the diagram, 1-powder distribution mechanism, 2-mold closing mechanism, 3-vacuum transition chamber, 4-vacuum working chamber, 5-discharge mechanism, 6-pressure mechanism, 7-feeding mechanism, 8-control system, 9-mold, 10-reserved station.

[0029] 21-Mold clamping frame, 22-Mechanical claw.

[0030] 31 - Outer door, 32 - Inner door.

[0031] 61-Main unit, 62-Connecting part, 63-Upper electrode plate, 64-Lower electrode plate.

[0032] 71-Pattern.

[0033] 91-Upper mold, 92-Lower mold, 93-Slot.

[0034] The diagrams show the mold assembly but not the lower mold separately, in order to better understand the structure of the mold assembly. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to specific embodiments.

[0036] Example 1 A large-scale parallel discharge plasma sintering production equipment includes a mold, a powder distribution mechanism, a mold closing mechanism, a vacuum system, a discharge mechanism, a pressure mechanism, a feeding mechanism, and a control system. The powder distribution mechanism, the discharge mechanism, and the vacuum system are respectively located on one side of the mold closing mechanism. The mold includes an upper mold and two lower molds, which alternately form a mold group for discharge plasma sintering with an upper mold. The mold group moves between the mold closing mechanism and the vacuum system via the feeding mechanism. Another lower mold for pre-powder distribution moves between the discharge mechanism, the mold closing mechanism, and the powder distribution mechanism via the feeding mechanism. The pressure head of the pressure mechanism enters the vacuum system from the top.

[0037] In this embodiment, the powder distribution mechanism includes a powder distributor (not shown in the figure) and a frame. The frame, feeding unit, lower mold, and powder distributor are arranged sequentially from bottom to top. The powder distributor is used to evenly distribute the powder in the mold cavity of the lower mold. The mold closing mechanism is located outside the vacuum system and includes a frame, a mold closing frame, and a mechanical gripper. The frame is below, the mold closing frame is above, and the mechanical gripper is mounted on the mold closing frame and located above the feeding unit. The vacuum system, pressure system, and feeding mechanism are all centrally controlled by a PLC (Programmable Logic Controller), displayed and operated via a touch screen. It can automatically operate according to preset process requirements, realize automatic workpiece feeding and positioning, and ensure that each process is performed sequentially and interlocked.

[0038] The vacuum system includes a vacuum transition chamber and a vacuum working chamber. The mold closing mechanism, vacuum transition chamber, and vacuum working chamber are arranged in sequence and lined up in a row. There is an outer door between the vacuum transition chamber and the mold closing mechanism, and an inner door between the vacuum transition chamber and the vacuum working chamber. The vacuum working chamber is always kept in a vacuum state.

[0039] In this embodiment, the vacuum transition chamber and the vacuum working chamber are arranged in a straight line, together forming a vacuum system. The vacuum pumping system (vacuum unit) is responsible for evacuating the vacuum transition chamber and the vacuum working chamber. The vacuum working chamber maintains a high vacuum state throughout the working cycle, avoiding the drawbacks of frequent evacuation and vacuum breaking of the entire sintering cavity in traditional equipment. The establishment of the vacuum transition chamber allows the mold assembly to act as a buffer and isolation cavity when entering and exiting the vacuum working chamber, maintaining the vacuum environment of the vacuum working chamber.

[0040] The outer door is raised and lowered by a hydraulic rod to open and close; the inner door is also raised and lowered by a hydraulic rod to open and close. When the mold assembly moves between the vacuum transition chamber and the mold closing mechanism, the outer door is open and the inner door is closed. When the mold assembly moves between the vacuum transition chamber and the vacuum working chamber, the outer door is closed, and the inner door is only opened when the vacuum transition chamber is in a vacuum state.

[0041] In this embodiment, the opening and closing logic of the outer and inner doors is strictly coordinated with the mold assembly's conveying process. When the mold assembly needs to enter the vacuum system from the atmospheric pressure mold closing mechanism, the outer door is opened first. After the mold assembly enters the vacuum transition chamber, the outer door is closed, and then the vacuum transition chamber is evacuated. Only after the vacuum level matches the vacuum working chamber is the inner door opened, allowing the mold assembly to enter the vacuum working chamber. Conversely, when the mold assembly exits, it first enters and is sealed in the vacuum transition chamber, and after depressurization, the outer door is opened to remove it. This design ensures that the vacuum environment of the vacuum working chamber is not disrupted.

[0042] The vacuum transition chamber is connected to the vacuum pumping system, and the vacuum working chamber is also connected to the vacuum pumping system. Both the vacuum transition chamber and the vacuum working chamber are vacuumed separately.

[0043] In this embodiment, the vacuum transition chamber and the vacuum working chamber are each connected to independent vacuum pipelines and valves, allowing for separate vacuuming operations. For example, after equipment initialization or maintenance, the vacuum working chamber can be evacuated for an extended period to achieve and maintain the working vacuum level. In each work cycle, only the smaller vacuum transition chamber needs to be evacuated and depressurized, significantly improving efficiency and reducing energy consumption.

[0044] The pressure mechanism includes a main unit, a pressure head, and a lower electrode plate. The pressure head includes a connecting part and an upper electrode plate. The main unit is located above the vacuum chamber. The main unit is connected to the upper electrode plate through the connecting part and controls the lifting and lowering of the upper electrode plate. The connecting part passes through the vacuum chamber. The lower electrode plate is set in the vacuum chamber. The upper electrode plate and the lower electrode plate form a sintering space to accommodate the mold assembly.

[0045] In this embodiment, the pressure mechanism is a three-beam, four-column hydraulic press. Its main unit (i.e., the press body) is located above and outside the vacuum chamber. The connecting part of the pressure head passes through the top of the vacuum chamber in a sealed manner from the top, and its end connects to the upper electrode plate. The lower electrode plate is fixedly located at the bottom inside the vacuum chamber. When the mold assembly moves to the sintering space between the upper and lower electrode plates and is positioned, the main unit drives the upper electrode plate to press down, applying pressure to the powder through the mold. Simultaneously, the upper and lower electrode plates are connected to the sintering power supply, performing discharge plasma sintering on the powder inside the mold.

[0046] The mold closing mechanism includes a mold closing frame and mechanical grippers. The mechanical grippers are mounted on the mold closing frame and are used to raise or lower the upper mold, as well as to clamp or release the upper mold.

[0047] In this embodiment, the mechanical gripper consists of a lifting drive component and a clamping drive component, which can accurately grasp the slot on the side wall of the upper mold to realize the lifting movement of the upper mold to complete the mold closing and opening actions with the lower mold.

[0048] The side wall of the upper mold is provided with a recessed slot for mechanical grippers to hold it.

[0049] In this embodiment, the gripping end of the mechanical claw can be embedded in the slot to achieve stable gripping and lifting of the upper mold, ensuring the accuracy of mold alignment.

[0050] The feeding mechanism includes five feeding units: a powder distribution mechanism, a mold closing mechanism, a vacuum transition chamber, a vacuum working chamber, and a discharge mechanism, each with a feeding unit. In the powder distribution mechanism, mold closing mechanism, vacuum transition chamber, and discharge mechanism, the feeding unit includes a support plate for supporting the lower mold and a driving mechanism. The driving mechanism drives the lower mold to translate between the support plates.

[0051] In this embodiment, the five feeding units may have the same or different structures, and those skilled in the art can design them according to the feeding direction or select from existing mechanisms. For example, it could be a robotic arm that pushes or pulls the mold assembly or lower mold; or it could be a gear and rack mechanism, with the rack set on the side wall of the lower mold, and the gear rotating to drive the lower mold to translate. The feeding mechanism of the vacuum chamber does not contain a pallet, and the mold assembly is directly pushed onto the lower electrode plate.

[0052] A large-scale parallel discharge plasma sintering production equipment includes a control system, which controls the actions of a powder distribution mechanism, a mold closing mechanism, a vacuum system, a material discharge mechanism, a pressure mechanism, and a feeding mechanism.

[0053] In this embodiment, the control system is based on a PLC and integrates a human-machine interface (touch screen). The PLC is electrically connected to all the sensors (such as position sensors, pressure sensors, and vacuum sensors) and actuators (such as motors, hydraulic valves, vacuum valves, and sintering power supplies) of all mechanisms. According to the preset program logic, it controls the entire production process to operate automatically, collaboratively, and in a chain, ensuring process consistency and product reliability.

[0054] Example 2 A large-scale parallel discharge plasma sintering production method, using large-scale parallel discharge plasma sintering production equipment, includes the following steps: S1: The lower mold includes a first lower mold and a second lower mold. While the first lower mold is located in the powder distribution mechanism to complete the pre-powder distribution, the second lower mold is located in the discharge mechanism.

[0055] In this embodiment, this step is the initial state of the cycle. Specifically: the first lower mold is located in the powder distribution mechanism and the powder distribution has been completed; the second lower mold is located in the discharge mechanism; the upper mold is suspended in the high position of the mold closing mechanism; all doors of the vacuum transition chamber and the vacuum working chamber are closed; the pressure head of the pressure mechanism is in the retracted high position.

[0056] S2: The first lower mold is transferred to the mold closing mechanism to close with the upper mold to form a mold assembly.

[0057] In this embodiment, the feeding mechanism horizontally transfers the first lower mold, which has already been powdered, from the powder dispensing mechanism to the mold closing mechanism. The mechanical claw of the mold closing mechanism descends, grasps the upper mold, precisely aligns it with the lower mold, and closes the mold to form a sealed mold assembly.

[0058] S3: The mold assembly is sent from the mold closing mechanism into the vacuum system, where discharge plasma sintering is performed in the vacuum chamber of the vacuum system; at the same time, after the mold assembly enters the vacuum system, the second lower mold is transferred from the discharge mechanism to the powder distribution mechanism for pre-powder distribution.

[0059] In this embodiment, this step is the core parallel operation step.

[0060] Main Process (Sintering): After mold assembly is closed, it is first sent into the vacuum transition chamber (outer door open). After the outer door is closed, the vacuum transition chamber is evacuated. Once the preset vacuum level is reached, the inner door is opened, and the mold assembly is sent into the vacuum chamber and positioned. Subsequently, the inner door is closed, and the vacuum chamber is evacuated to the required high vacuum level. The pressure head is pressed down, applying the set pressure to the powder through the mold. At the same time, the sintering power supply is turned on to execute the spark plasma sintering process.

[0061] Parallel Process (Pre-powder Preparation): Parallel operation begins after the mold assembly leaves the mold closing mechanism and enters the vacuum transition chamber. The feeding mechanism drives the second lower mold located at the discharge mechanism to move backward, passing through the mold closing mechanism (this area is now empty), and finally reaching the powder distribution mechanism. The powder distribution mechanism then automatically distributes material to the second lower mold. This parallel operation makes full use of the processing time of the main process in the vacuum system.

[0062] S4: Remove the sintered mold assembly from the vacuum system and return it to the mold closing mechanism to open the mold, so that the first lower mold moves to the discharge mechanism.

[0063] In this embodiment, after the sintering process is completed, the pressure head returns to its original position. The inner door of the vacuum transition chamber opens, the mold assembly moves from the vacuum working chamber back into the vacuum transition chamber, and the inner door closes. After the vacuum transition chamber is pressurized to atmospheric pressure, the outer door opens, and the mold assembly is moved out to the mold closing mechanism. The mechanical gripper clamps the upper mold and controls the upper mold to rise and open. Subsequently, the first lower mold, which now contains the sintered finished product, is sent to the unloading mechanism to await part removal.

[0064] S5: The second lower mold, which has been pre-powdered, is transferred to the mold closing mechanism to close with the upper mold to form a mold assembly.

[0065] In this embodiment, the second lower mold, having completed the fabric application, is brought to the preparatory position of the mold closing mechanism. Subsequently, the mechanical gripper moves the upper mold above the second lower mold and completes the mold closing, forming a new mold assembly, preparing for the sintering of the next cycle.

[0066] S6: Repeat steps S3 to S5 to alternately sinter and pre-powder distribution between the first and second lower molds.

[0067] In this embodiment, after completing step S5, the system state becomes symmetrical to the initial state of step S1 (the positions of the first lower mold and the second lower mold are exchanged). The system automatically enters the next working cycle, repeating the sintering process of steps S3 to S5 with the new mold set. At the same time, after the original first lower mold is removed by the unloading mechanism, it can be transferred to the powder feeding mechanism for the next round of material preparation. This cycle repeats continuously, realizing the alternating parallel operation of the two lower molds in the "powder feeding-mold closing-sintering-unloading" process.

[0068] According to equipment operation verification, the entire cycle time is approximately 3.5 minutes, which significantly improves equipment utilization and production efficiency, and greatly increases the size of products that can be processed.

[0069] In addition to the methods mentioned in the above embodiments, the powder dispensing mechanism or the discharge mechanism can be arranged at a reserved workstation. These variations are all within the scope of protection of this invention.

[0070] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A large-scale parallel discharge plasma sintering production equipment, characterized in that: It includes a mold, a powder distribution mechanism, a mold closing mechanism, a vacuum system, a discharge mechanism, a pressure mechanism, a feeding mechanism, and a control system; the powder distribution mechanism, the discharge mechanism, and the vacuum system are respectively located on one side of the mold closing mechanism; the mold includes an upper mold and two lower molds, which alternately form a mold group with an upper mold for discharge plasma sintering, and the mold group moves between the mold closing mechanism and the vacuum system through the feeding mechanism; another lower mold for pre-powder distribution moves between the discharge mechanism, the mold closing mechanism, and the powder distribution mechanism through the feeding mechanism; the pressure head of the pressure mechanism enters the vacuum system from the top.

2. A large-scale parallel discharge plasma sintering production equipment according to claim 1, characterized in that: The vacuum system includes a vacuum transition chamber and a vacuum working chamber. The mold closing mechanism, vacuum transition chamber, and vacuum working chamber are arranged in sequence and lined up in a row. There is an outer door between the vacuum transition chamber and the mold closing mechanism, and an inner door between the vacuum transition chamber and the vacuum working chamber. The vacuum working chamber is always kept in a vacuum state.

3. A large-scale parallel discharge plasma sintering production equipment according to claim 2, characterized in that: The outer door is raised and lowered by a hydraulic rod to open and close; the inner door is also raised and lowered by a hydraulic rod to open and close. When the mold assembly moves between the vacuum transition chamber and the mold closing mechanism, the outer door is open and the inner door is closed. When the mold assembly moves between the vacuum transition chamber and the vacuum working chamber, the outer door is closed, and the inner door is only opened when the vacuum transition chamber is in a vacuum state.

4. A large-scale parallel discharge plasma sintering production equipment according to claim 2, characterized in that: The vacuum transition chamber is connected to the vacuum pumping system, and the vacuum working chamber is also connected to the vacuum pumping system. Both the vacuum transition chamber and the vacuum working chamber are vacuumed separately.

5. A large-scale parallel discharge plasma sintering production equipment according to claim 2, characterized in that: The pressure mechanism includes a main unit, a pressure head, and a lower electrode plate. The pressure head includes a connecting part and an upper electrode plate. The main unit is located above the vacuum chamber. The main unit is connected to the upper electrode plate through the connecting part and controls the lifting and lowering of the upper electrode plate. The connecting part passes through the vacuum chamber. The lower electrode plate is set in the vacuum chamber. The upper electrode plate and the lower electrode plate form a sintering space to accommodate the mold assembly.

6. A large-scale parallel discharge plasma sintering production equipment according to claim 1, characterized in that: The mold closing mechanism includes a mold closing frame and mechanical grippers. The mechanical grippers are mounted on the mold closing frame and are used to raise or lower the upper mold, as well as to clamp or release the upper mold.

7. A large-scale parallel discharge plasma sintering production equipment according to claim 6, characterized in that: The side wall of the upper mold is provided with a recessed slot for mechanical grippers to hold it.

8. A large-scale parallel discharge plasma sintering production equipment according to claim 2, characterized in that: The feeding mechanism includes five feeding units: a powder distribution mechanism, a mold closing mechanism, a vacuum transition chamber, a vacuum working chamber, and a discharge mechanism, each with a feeding unit. In the powder distribution mechanism, mold closing mechanism, vacuum transition chamber, and discharge mechanism, the feeding unit includes a support plate for supporting the lower mold and a driving mechanism. The driving mechanism drives the lower mold to translate between the support plates.

9. A large-scale parallel discharge plasma sintering production equipment according to claim 1, characterized in that: It includes a control system, which controls the powder distribution mechanism, mold closing mechanism, vacuum system, material discharge mechanism, pressure mechanism, and feeding mechanism.

10. A method for producing large-scale parallel discharge plasma sintering equipment, using any one of claims 1-9, characterized in that: Includes the following steps: S1: The lower mold includes a first lower mold and a second lower mold. While the first lower mold is located in the powder distribution mechanism to complete the pre-powder distribution, the second lower mold is located in the discharge mechanism. S2: The first lower mold is transferred to the mold closing mechanism to close with the upper mold to form a mold assembly; S3: The mold assembly is sent from the mold closing mechanism into the vacuum system, where discharge plasma sintering is performed in the vacuum chamber of the vacuum system; at the same time, after the mold assembly enters the vacuum system, the second lower mold is transferred from the material discharge mechanism to the powder distribution mechanism for pre-powder distribution. S4: Remove the sintered mold assembly from the vacuum system and return it to the mold closing mechanism to open the mold, so that the first lower mold moves to the discharge mechanism; S5: The second lower mold, which has been pre-powdered, is transferred to the mold closing mechanism to be closed with the upper mold to form a mold assembly; S6: Repeat steps S3 to S5 to alternately sinter and pre-powder distribution between the first and second lower molds.

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