A streamlined flash sintering system and sintering method

Abstract

This invention relates to the field of advanced powder metallurgy and ceramic material sintering technology, and provides a streamlined flash sintering system and method. The system includes: a powder loading and pre-pressing module, a first graphite paper automatic pressing and replacement module, a sintering module, a demolding and sampling module, and a second graphite paper automatic pressing and replacement module arranged sequentially along the material flow direction; each module is connected by a vacuum transfer module to form a continuous vacuum environment; the system also includes a conveying system for driving the sintering unit carrying the material to flow sequentially between the modules; this invention is suitable for efficient and fully automated continuous flash sintering of powder materials in a vacuum or protective atmosphere environment, which can fundamentally avoid the risk of platform overturning and ensure the stability and safety of the sintering process.

Description

Technical Field

[0001] This invention relates to the field of advanced powder metallurgy and ceramic material sintering technology, specifically a production line flash sintering system and sintering method. Background Technology

[0002] Flash sintering is a cutting-edge electric field-assisted sintering technology. Its basic principle is to apply a specific electric field to a powder compact, inducing rapid densification of the material within seconds to minutes at extremely low external heating temperatures (typically only 50%-70% of the material's melting point), accompanied by a noticeable flash phenomenon. Compared to traditional sintering techniques, flash sintering offers unique advantages such as extremely low sintering temperature, extremely short time, significantly reduced energy consumption, and effective suppression of grain growth to obtain ultrafine-grained microstructures, demonstrating enormous application potential in the preparation of high-performance ceramics, nanocomposites, and functionally graded materials. However, the transformation of this groundbreaking laboratory technology into large-scale industrial production faces severe challenges. Currently, the vast majority of flash sintering research is based on single-station, batch (intermittent) experimental furnaces. This model requires all processes, such as powder loading, sintering, cooling, and sampling, to be completed sequentially within the same chamber, which has inherent drawbacks: 1) Low production efficiency: Each sintering cycle includes a long heating and cooling phase, and station switching, mold preparation, and sample removal all require manual intervention or lead to production interruptions, making it impossible to form a continuous production flow; 2) Poor process consistency: There are many uncertainties introduced by manual operation, resulting in unstable product quality; 3) Difficulty in maintaining a vacuum environment: Each loading and sampling requires disrupting the vacuum environment of the chamber, and the process of re-vacuuming is time-consuming and energy-intensive.

[0003] To improve efficiency, some attempts have emerged in existing technologies aimed at continuous production. For example, Chinese invention patent CN118391921A discloses a continuous SPS feeding system and its feeding method. This system sets up a sintering zone, a heat preservation zone, a slow cooling zone, and a cooling zone, and uses a diversion component to distribute the material according to the temperature of the sintered product mold. This aims to solve the problem of inconsistent furnace exit temperature caused by different product cooling rates, thereby achieving continuous material feeding and discharging.

[0004] However, analysis reveals that this existing technical solution has significant limitations and fails to truly meet the needs of continuous industrial production of flash sintering:

[0005] 1. Limited functionality and does not cover the entire flash sintering process: The system is essentially a linear device focused on post-sintering cooling and feeding. It does not integrate key process units necessary for flash sintering, such as automatic powder loading and pre-pressing, automatic and precise graphite paper laying and replacement, automatic demolding and sampling of sintered products, and online cleaning of molds and electrodes. Therefore, it cannot form a complete fully automated production line.

[0006] 2. The design was not tailored to the characteristics of flash sintering: Flash sintering is accompanied by rapid Joule heating and possible plasma activation, which places extremely high demands on electric field uniformity, pressure control and rapid thermal management. The feeding system did not reflect the coordinated and precise control of these core process parameters in a continuous process scenario.

[0007] 3. Insufficient continuity and flexibility of the vacuum system: Although a partitioned sealing design is adopted, it is still difficult to achieve modular vacuum isolation and rapid recovery when dealing with mold changes, process abnormalities or system maintenance, which may affect the efficient and continuous operation of the entire system.

[0008] 4. Unresolved issues regarding the automated maintenance of core components: The problem of online cleaning and rapid replacement of molds and punches (electrodes) under high-frequency and high-current conditions in flash sintering has not been solved, which is the key to ensuring long-term stable production.

[0009] Existing technologies still cannot effectively solve the fundamental problems of full-process automation, production continuity, and process stability that flash sintering technology faces in moving from the laboratory to industrialization.

[0010] Therefore, in view of the above situation, there is an urgent need to provide a production line-type flash sintering system and sintering method to overcome the shortcomings in current practical applications. Summary of the Invention

[0011] The purpose of this invention is to provide a streamlined flash sintering system and sintering method, which aims to solve the problems in the background art.

[0012] This invention is implemented as follows: a streamlined flash sintering system and sintering method, comprising:

[0013] The following modules are arranged sequentially along the material flow direction: powder loading and pre-compression module, first graphite paper automatic pressing and replacement module, sintering module, demolding and sampling module, and second graphite paper automatic pressing and replacement module; each module is connected by a vacuum transfer module to form a continuous vacuum environment.

[0014] The sintering module includes a sintering unit;

[0015] The system also includes a conveying system for driving the sintering unit carrying the material to flow sequentially between the modules;

[0016] The powder loading and pre-pressing module is used to quantitatively fill powder into the mold in the sintering unit and pre-press it into a green blank.

[0017] The first graphite paper automatic pressing and replacement module is used to press the first layer of graphite paper under the green body;

[0018] The second graphite paper automatic pressing and replacement module is used to press a second layer of graphite paper on top of the green body;

[0019] The sintering module is used to apply pressure and current to the green blank sandwiched between two layers of graphite paper to perform flash sintering and form a sintered finished product.

[0020] The demolding and sampling module is used to eject the sintered finished product from the mold, and simultaneously clean the inner wall of the mold and the end face of the punch, while collecting the sintered finished product.

[0021] The vacuum adapter module is used to connect the vacuum chambers of each module and provides the transport track for the sintering unit.

[0022] As a further aspect of the present invention: the sintering module includes a first support frame;

[0023] The sintering module also includes a power supply unit, a sintering pressure generating unit, a sintering vacuum unit, a first lifting unit, a sintering unit, a sintering conveying unit, and an electrode cooling unit;

[0024] The power supply unit includes a lower electrode, an upper electrode, a sintered upper punch, and a current generating device;

[0025] The first support frame is used to fix the sintering pressure generating unit, the sintering vacuum unit and the first lifting unit;

[0026] The sintering unit includes a sintering platform, a floating mold module, a floating lower punch module, an upper guide post, and a lower guide post.

[0027] The sintering platform is fixedly equipped with an upper guide column and a lower guide column;

[0028] The first lifting unit pushes the floating lower punch module to slide upward along the lower guide column by lifting the lower electrode set in the power supply unit. The floating lower punch module contacts and pushes the floating mold module and the sintering sample raw material to slide upward along the upper guide column.

[0029] The sintering pressure generating unit includes a sintering hydraulic cylinder and a sintering piston rod;

[0030] The sintering hydraulic cylinder outputs downward moving force to the sintering piston rod. The sintering piston rod pushes the sintering upper punch through the upper electrode set by the power supply unit to output pressure on the upper surface of the sintering sample material. The power supply unit outputs the current generated by the current generator to the upper and lower surfaces of the sintering sample material through wires, upper electrode and lower electrode. The sintering conveying unit realizes the overall station switching of the sintering unit. The electrode cooling unit contacts and cools the sintering upper punch.

[0031] As a further embodiment of the present invention: the demolding and sampling module includes a demolding and sampling vacuum unit, a demolding pressure generating unit, a second lifting unit, and a second support frame;

[0032] The demolding and sampling module also includes a sample collection and electrode cleaning unit, a demolding and sampling transfer unit, and a mold support frame;

[0033] The second support frame secures the demolding pressure generating unit, the second lifting unit, and the demolding and sampling vacuum unit.

[0034] The demolding and sampling vacuum unit is equipped with a demolding vacuum chamber and a sampling vacuum chamber;

[0035] The second lifting unit is equipped with a second screw jack and a mold frame lifting rod. The second screw jack lifts the fixedly connected support mold frame through the mold frame lifting rod.

[0036] The lifting mold frame is equipped with a first mold frame platform and a second mold frame platform. The first mold frame platform lifts the floating mold module through the first limiting groove, and slides the floating mold module along the upper guide column and the extended guide column fixed on the demolding vacuum box to a set height.

[0037] The sample collection and electrode cleaning unit includes a sample collection chute and a cleaning sand belt. The sample collection chute and the cleaning sand belt slide through the second limiting groove set on the first mold frame platform to the bottom of the floating mold module.

[0038] The demolding pressure generating unit includes a demolding hydraulic cylinder, which outputs a downward moving force to the demolding punch. The demolding punch, through a demolding punch head fixedly connected to it, outputs pressure on the upper surface of the sintered sample product and pushes the sintered sample product to slide relative to the inner wall of the floating mold module, thereby completing the demolding.

[0039] The sample collection chute receives the sintered sample product after demolding, the cleaning sand belt cleans the upper surface of the floating lower punch module that slides up the lower guide column of the second mold frame platform, and the cleaning brush set between the demolding punch and the demolding punch simultaneously cleans the inner wall of the floating mold module.

[0040] The sampling vacuum chamber collects the sintered sample finished product, which is received by the sample collection chute.

[0041] The demolding and sampling transfer unit completes the overall station switching of the sintering unit.

[0042] As a further aspect of the present invention: the first graphite paper automatic pressing and replacement module includes a graphite paper automatic pressing and replacement vacuum unit, a graphite paper automatic pressing and replacement conveying unit, a graphite paper automatic pressing pressure generating unit, a third support frame, and a third lifting unit.

[0043] The first automatic graphite paper pressing and replacement module also includes a graphite paper winding work unit, a graphite paper winding spare unit, a graphite paper hollow punching unit, and a graphite paper replacement transmission guide rail.

[0044] The third support frame secures the automatic graphite paper pressing and replacement vacuum unit, the automatic graphite paper pressing pressure generating unit, and the third lifting unit.

[0045] The automatic graphite paper laying and replacement vacuum unit is equipped with an automatic graphite paper laying vacuum box and an automatic graphite paper replacement vacuum box.

[0046] The third lifting unit is equipped with a third screw jack and a graphite paper pressing support base. The third screw jack receives power from the servo motor and lifts the floating lower punch module and floating mold module contained in the sintering unit through the graphite paper pressing support base, so that the floating lower punch module and floating mold module are removed from the sintering platform.

[0047] The graphite paper winding unit is equipped with graphite paper, graphite paper recycling roll, graphite paper storage roll and graphite paper roll drive motor. The graphite paper roll drive motor, which is fixed to the graphite paper automatic pressing vacuum box via the motor support plate, drives the graphite paper recycling roll to transport the new graphite paper in the graphite paper storage roll to the middle of the graphite paper hollow punching unit and sintering unit.

[0048] The graphite paper hollow punch unit is equipped with a graphite paper push rod, a punch return spring, and a hollow punch. The two ends of the punch return spring are fixedly connected to the graphite paper push rod and the hollow punch, respectively.

[0049] The graphite paper automatic pressing pressure generating unit outputs pressing force to the graphite paper push rod. The graphite paper push rod drives the graphite paper hollow punch unit to move downwards until the hollow punch contacts the graphite paper in the sintering unit. The punch return spring transmits the pressing force output by the graphite paper push rod to the hollow punch. The hollow punch punches graphite paper sheets of a fixed specification. The graphite paper push rod presses the graphite paper sheets into the floating mold module at a set depth.

[0050] The automatic graphite paper pressing and replacement conveyor unit completes the overall station switching of the sintering unit.

[0051] As a further embodiment of the present invention: the powder loading and pre-pressing module includes a powder loading and pre-pressing vacuum unit, a powder loading and pre-pressing pressure generating unit, a fourth support frame, and a fourth lifting unit;

[0052] The powder loading and pre-compression module also includes a pre-compression unit, a powder loading unit, a vacuum storage unit, and a powder loading and pre-compression conveying unit;

[0053] The fourth support frame secures the powder loading and pre-compression vacuum unit, the powder loading and pre-compression pressure generating unit, and the fourth lifting unit;

[0054] The fourth lifting unit is equipped with a fourth screw jack and a pre-pressing base. The fourth screw jack receives power from the servo motor and lifts the floating lower punch module and floating mold module contained in the sintering unit through the pre-pressing base, so that the floating lower punch module and floating mold module are removed from the sintering platform.

[0055] The pre-compression unit is equipped with a green billet pressure bar, an auxiliary material cylinder, a material cylinder return spring, and an extension tube. The upper and lower sides of the material cylinder return spring are in contact with the green billet pressure bar and the auxiliary material cylinder, respectively.

[0056] The powder loading and pre-pressing pressure generating unit is equipped with a powder loading and pre-pressing servo hydraulic cylinder and an extended pressure rod. The powder loading and pre-pressing servo hydraulic cylinder outputs pressing force to the green billet pressure rod through the extended pressure rod. The green billet pressure rod drives the auxiliary material cylinder and the extended material tube to move downward through the material cylinder reset spring until the auxiliary material cylinder is in close contact with the upper surface of the floating mold module.

[0057] The powder loading unit is equipped with an internal storage cylinder and a quantitative injection valve, and the vacuum storage unit is equipped with a vacuum storage silo and a vacuum discharge valve. The internal storage cylinder, which is fixed to the powder loading and pre-compression vacuum unit by the internal storage cylinder support column, receives the powder stored in the vacuum storage silo by opening the vacuum discharge valve. The quantitative injection valve quantitatively delivers the powder into the floating mold module mold and auxiliary cylinder through the extended material pipe. The powder is pressed on the graphite paper pressed by the first graphite paper automatic pressing and replacement module.

[0058] The green compaction bar transmits the pressing force of the powder loading and pre-pressing servo hydraulic cylinder to the upper surface of the powder, thus completing the pressing of the green compact;

[0059] The driving slider drives the sintering unit to achieve overall station switching along the powder loading and pre-pressing conveying unit.

[0060] As a further aspect of the present invention: the sintering vacuum unit includes a sintering vacuum chamber body and a first vacuum chamber support;

[0061] The sintering vacuum chamber body is connected to the vacuum transfer module through the first vacuum gate valves fixed on both sides to provide a vacuum environment for the sintering module. A sliding sealing ring is provided between the sintering vacuum chamber body and the upper and lower electrodes.

[0062] The sintering vacuum chamber body is also equipped with a sintering vacuum chamber door for maintenance on the outside; the first vacuum chamber bracket fixes the sintering vacuum chamber body on the first support frame.

[0063] As a further aspect of the present invention: the automatic graphite paper pressing and replacement vacuum unit is further provided with a graphite paper replacement vacuum gate valve, a third vacuum gate valve and a third vacuum box bracket. The third vacuum gate valve is fixedly installed on both sides of the automatic graphite paper pressing vacuum box and connected to the vacuum transfer module to provide a vacuum environment for the first automatic graphite paper pressing and replacement module.

[0064] The graphite paper replacement vacuum valve is fixedly installed between the graphite paper automatic pressing vacuum box and the graphite paper automatic replacement vacuum box, isolating the graphite paper automatic pressing vacuum box and the graphite paper automatic replacement vacuum box.

[0065] The third vacuum box bracket secures the automatic graphite paper pressing vacuum box and the automatic graphite paper changing vacuum box to the third support frame;

[0066] The automatic graphite paper pressing vacuum box is equipped with a maintenance door on the outside, and the automatic graphite paper replacement vacuum box is equipped with a door for replacing the old graphite paper winding work unit that stores and replaces old graphite paper.

[0067] As a further embodiment of the present invention: the powder loading and pre-compression vacuum unit is provided with a powder loading and pre-compression vacuum box, a receiving sealing flange, a fourth vacuum gate valve and a fourth vacuum box bracket. The fourth vacuum gate valve is fixedly installed on both sides of the powder loading and pre-compression vacuum box and connected to the vacuum transfer module to provide a vacuum environment for the powder loading and pre-compression module.

[0068] The fourth vacuum box bracket secures the powder-filling and pre-compression vacuum box to the fourth support frame;

[0069] The receiving sealing flange is installed on the vacuum storage unit on the powder loading and pre-compression vacuum box;

[0070] The powder loading and pre-compression vacuum box is equipped with a maintenance door on the outside.

[0071] As a further embodiment of the present invention: the demolding and sampling vacuum unit is further provided with a second vacuum gate valve, a sampling vacuum gate valve, a second vacuum box bracket and a support plate. The second vacuum gate valve is fixedly installed on both sides of the demolding vacuum box and connected to the vacuum transfer module to provide a vacuum environment for the demolding and sampling module.

[0072] The sampling vacuum gate valve is fixedly installed between the demolding vacuum box and the sampling vacuum box to isolate the demolding vacuum box from the sampling vacuum box.

[0073] The second vacuum box bracket fixes the demolding vacuum box onto the second support frame, and the support plate fixes the extended guide column onto the demolding vacuum box;

[0074] The demolding vacuum chamber is equipped with a demolding vacuum chamber door for maintenance, and the sampling vacuum chamber is equipped with a sampling vacuum chamber door for collecting sintered sample products.

[0075] This invention also provides a streamlined flash sintering method, employing the streamlined flash sintering system described above, comprising the following steps:

[0076] S1. Vacuum Acquisition: Open the vacuum gate valves of each module, connect each module, and then use a vacuum pump to evacuate the system to the target vacuum level.

[0077] S2, Pressing the first layer of graphite paper: After cleaning, the sintering unit moves to the first graphite paper automatic pressing and replacement module, lifts the mold group, punches and presses the first layer of graphite paper to the bottom of the mold;

[0078] S3. Powder loading and pre-pressing: The sintering unit with the first layer of graphite paper is moved to the powder loading and pre-pressing module, the mold group is lifted, powder is added in a certain amount and pre-pressed into a green blank;

[0079] S4. Pressing the second layer of graphite paper: The sintering unit containing the green body moves to the automatic pressing and replacement module for the second graphite paper, lifts the mold group, punches and presses the second layer of graphite paper on top of the green body.

[0080] S5. Sintering: The sintering unit containing the green blank and two layers of graphite paper is moved to the sintering module, the mold assembly is lifted to make it float, and pressure and current are applied to perform flash sintering to form the sintered finished product.

[0081] S6. Demolding and Sampling: The sintering unit containing the sintered finished product moves to the demolding and sampling module, lifts the mold assembly to the demolding station, ejects the sintered finished product, cleans the mold and punch simultaneously, and collects the sintered finished product.

[0082] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0083] 1. The "floating design" of the sintering module: By detaching the floating mold module and floating lower punch module from the sintering platform during sintering, the enormous axial pressing force is cleverly isolated from the conveying system, fundamentally avoiding the risk of platform overturning and ensuring the stability and safety of the sintering process. This is a key structural guarantee for achieving continuous production.

[0084] 2. The "integrated design" of the demolding and sampling module enables simultaneous online high-temperature demolding, sample collection, mold cleaning, and electrode cleaning. This not only significantly shortens the process time but, more importantly, reduces the risk of sample breakage due to uneven thermal stress at high temperatures. Simultaneously, automated cleaning significantly extends the service life of the mold and electrodes.

[0085] 3. Automatic Graphite Paper Laying and Changing Module: This module eliminates a tedious manual step in the SPS process. Automated graphite paper roll changing is achieved through a magnetic switching unit, ensuring continuous production. The integrated hollow stamping and elastic laying design ensures the precision and quality of the graphite paper sheets.

[0086] 4. Modular slide gate valve design for the vacuum system: This is the core of achieving continuous vacuum production. When a module (such as the sintering module) requires maintenance, the vacuum slide gate valves at both ends of it can be closed, isolating it from the system for repair, while other modules can remain under vacuum. After maintenance, only the module needs to be evacuated individually to restore operation, greatly shortening system recovery time and improving equipment utilization. Attached Figure Description

[0087] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0088] Figure 1 This is a schematic diagram of the overall structure of a production line vacuum flash sintering system according to the present invention;

[0089] Figure 2 This is a top view schematic diagram of a streamlined vacuum flash sintering system according to the present invention;

[0090] Figure 3 This is a schematic diagram of the left rear structure of the sintering module of the present invention;

[0091] Figure 4 This is a schematic diagram of the vacuum-free sintering process of the sintering module of the present invention (a: before sintering, b: during sintering);

[0092] Figure 5 This is a schematic diagram of the left front structure of the vacuum unit of the sintering module of the present invention;

[0093] Figure 6 This is a schematic diagram of the sintering unit and conveying unit of the sintering module of the present invention;

[0094] Figure 7 This is a schematic diagram of the electrode cooling unit structure of the sintering module of the present invention;

[0095] Figure 8 This is a schematic diagram of the left front structure of the demolding and sampling module of the present invention;

[0096] Figure 9 This is a schematic diagram of the left rear structure of the vacuum unit of the demolding and sampling module of the present invention;

[0097] Figure 10 This is a schematic diagram of the front left structure of the demolding and sampling module without a vacuum box in this invention;

[0098] Figure 11 This is a schematic diagram of the vacuum-free demolding and sampling process of the demolding and sampling module of the present invention (a: before operation, b: during operation).

[0099] Figure 12 This is a schematic diagram of the left front structure of the automatic graphite paper pressing and replacement module of the present invention;

[0100] Figure 13 This is a schematic diagram of the left front structure of the vacuum unit of the automatic graphite paper pressing and replacement module of the present invention;

[0101] Figure 14 This is a right rear view of the automatic graphite paper laying process of the automatic graphite paper laying and replacement module of the present invention.

[0102] Figure 15 This is a right rear view of the automatic graphite paper replacement process of the automatic graphite paper laying and replacement module of the present invention.

[0103] Figure 16 This is an exploded structural diagram of the graphite paper winding working unit of the automatic graphite paper pressing and replacement module of the present invention.

[0104] Figure 17 This is a schematic diagram of the right front structure of the graphite paper assembly replacement unit in the automatic graphite paper laying and replacement module of the present invention.

[0105] Figure 18 This is a schematic diagram of the left front structure of the powder loading and pre-compression module of the present invention;

[0106] Figure 19 This is a front view of the vacuum-free powder loading and pre-compression process of the powder loading and pre-compression module of the present invention (a: before operation; b: during operation).

[0107] Figure 20 This is a schematic diagram of the left front structure of the vacuum unit of the powder loading and pre-compression module of the present invention;

[0108] Figure 21 This is a schematic diagram of the vacuum adapter module of the present invention.

[0109] In the attached diagram: 1-Sintering module, 11-Power supply unit, 111-Current generator, 112-Wire, 113-Upper electrode, 114-Sintering upper punch, 115-Lower electrode, 12-Sintering pressure generating unit, 121-Sintering hydraulic cylinder, 122-Sintering piston rod, 13-First support frame, 14-Sintering vacuum unit, 141-Sintering vacuum chamber body, 142-First vacuum slide valve, 143-Sliding sealing ring, 144-Sintering vacuum chamber door, 145-First vacuum chamber bracket, 15-First lifting unit, 151-First screw jack, 152-Screw, 16-Sintering unit, 161-Sintering platform, 162-Floating mold module, 163-Floating lower punch module, 164-Upper guide column. 165-Lower guide post, 166-Sintered sample raw material, 167-Sintered sample finished product, 17-Sintering conveyor unit, 171-Guide rail fixing block, 172-Guide rail, 173-Drive slider, 174-Driven slider, 18-Electrode cooling unit, 181-Cooling copper block, 182-Screw drive motor, 183-Bidirectional screw, 184-Electrode cooling unit support frame, 2-Demolding and sampling module, 21-Sample collection and electrode cleaning unit, 211-Sample collection chute, 212-Cleaning sanding belt, 213-Chute servo electric cylinder, 214-Chute push rod, 215-Sample collection and electrode cleaning module support leg, 216-Guide bearing, 217-Sanding belt drive wheel, 22-Demolding and sampling vacuum unit, 221- 222-Demolding vacuum chamber, 223-Sampling vacuum chamber, 224-Second vacuum gate valve, 225-Second vacuum chamber bracket, 226-Demolding vacuum chamber door, 227-Sampling vacuum chamber door, 228-Support plate, 229-Extended guide column, 23-Demolding and sampling conveying unit, 24-Demolding pressure generating unit, 241-Demolding hydraulic cylinder, 242-Demolding punch, 243-Demolding punch head, 244-Cleaning brush, 25-Second lifting unit, 251-Second screw jack, 252-Mold frame lifting rod, 26-Second support frame, 27-Mold frame lifting, 271-First mold frame platform, 272-Second mold frame platform, 273-First limiting groove, 274-Second limiting groove, 3-First stone Automatic graphite paper pressing and replacement module; 31-graphite paper winding unit; 311-graphite paper; 312-graphite paper recycling roll; 313-graphite paper reserve roll; 314-guide roller; 3141-fixing nut; 315-L-shaped support base; 3151-first flange bearing; 3152-first support rod; 3153-auxiliary support plate; 316-U-shaped support plate; 3161-second flange bearing; 3162-second support rod; 3163-avoidance protrusion; 317-magnetic switch base; 3171-magnetic switch lever; 3172-fixed slide rail; 318-graphite paper roll drive motor; 319-motor support plate; 32-graphite paper winding spare unit; 33-automatic graphite paper pressing and replacement vacuum unit.331-Automatic graphite paper pressing vacuum box; 332-Automatic graphite paper changing vacuum box; 333-Automatic graphite paper pressing vacuum box door; 334-Automatic graphite paper changing vacuum box door; 335-Graphite paper changing vacuum gate valve; 336-Third vacuum gate valve; 337-Third vacuum box bracket; 34-Automatic graphite paper pressing and changing conveyor unit; 35-Graphite paper hollow punch unit; 351-Graphite paper push rod; 352-Punch return spring; 353-Hollow punch; 36-Graphite paper changing transmission guide rail; 361-First transmission module; 3611-First transmission slide rail. 3612-L-type support slider, 3613-L-type slide rail support plate, 362-Second transmission module, 3621-Second transmission slide rail, 3622-Self-driven slider, 363-First replacement module, 3631-First replacement guide rail, 3632-First support slide rail, 3633-First push rod, 3634-First push rod support plate, 364-Second replacement module, 3641-Second replacement guide rail, 3642-Second support slide rail, 3643-Second push rod, 3644-Second push rod support plate, 365-Replacement module support plate, 37-Automatic graphite paper The components are as follows: 38-Third support frame, 39-Third lifting unit, 391-Third screw jack, 392-Graphite paper laying support base, 4-Powder loading and pre-compression module, 41-Pre-compression unit, 411-Green compaction bar, 412-Auxiliary material cylinder, 413-Material cylinder return spring, 414-Extended material pipe, 42-Powder loading unit, 421-Internal storage cylinder, 422-Quantitative injection valve, 423-Internal storage cylinder support column, 43-Vacuum storage unit, 431-Vacuum storage silo, 432-Vacuum discharge valve, 44-Powder loading and pre-compression vacuum unit. 441-Powder loading and pre-compression vacuum box; 442-Powder loading and pre-compression vacuum box door; 443-Receiving sealing flange; 444-Fourth vacuum slide gate valve; 445-Fourth vacuum box bracket; 45-Powder loading and pre-compression conveying unit; 46-Powder loading and pre-compression pressure generating unit; 461-Powder loading and pre-compression servo hydraulic cylinder; 462-Extension pressure rod; 47-Fourth support frame; 48-Fourth lifting unit; 481-Fourth screw jack; 482-Pre-compression base; 5-Second automatic graphite paper pressing and replacement module; 6-Vacuum transfer module; 61-Vacuum transfer chamber; 62-Transfer guide rail. Detailed Implementation

[0110] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present 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.

[0111] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0112] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0113] The present invention will be further explained below with reference to specific embodiments.

[0114] Please see Figures 1-21 The present invention provides a production line-type flash sintering system and sintering method, the production line-type flash sintering system and sintering method comprising:

[0115] The following modules are arranged sequentially along the material flow direction: powder loading and pre-compression module 4, first graphite paper automatic pressing and replacement module 3, sintering module 1, demolding and sampling module 2, and second graphite paper automatic pressing and replacement module 5; each module is connected by a vacuum transfer module 6 to form a continuous vacuum environment.

[0116] The sintering module 1 includes a sintering unit 16;

[0117] The system also includes a conveying system for driving the sintering unit 16 carrying materials to flow sequentially between the modules;

[0118] The powder loading and pre-pressing module 4 is used to quantitatively fill powder into the mold in the sintering unit 16 and pre-press it into a green blank.

[0119] The first graphite paper automatic pressing and replacement module 3 is used to press the first layer of graphite paper under the green body;

[0120] The second graphite paper automatic pressing and replacement module 5 is used to press a second layer of graphite paper on top of the green body;

[0121] The sintering module 1 is used to apply pressure and current to the green blank sandwiched between two layers of graphite paper to perform flash sintering and form a sintered finished product.

[0122] The demolding and sampling module 2 is used to eject the sintered finished product from the mold, and simultaneously clean the inner wall of the mold and the end face of the punch, while collecting the sintered finished product.

[0123] The vacuum transfer module 6 is used to connect the vacuum chambers of each module and provides the conveying track for the sintering unit 16.

[0124] Among them, reference Figures 3-7 The sintering module 1 includes a first support frame 13, a power supply unit 11, a sintering pressure generating unit 12, a sintering vacuum unit 14, a first lifting unit 15, a sintering unit 16, a sintering conveying unit 17, and an electrode cooling unit 18. The first support frame 13 fixes the sintering pressure generating unit 12, the sintering vacuum unit 14, and the first lifting unit 15. The sintering unit 16 includes a sintering platform 161, a floating mold module 162, and a floating lower punch module 163. The sintering platform is fixedly equipped with an upper guide post 164 and a lower guide post 165. The first lifting unit 15 is equipped with a first screw jack 151 and a screw 152. The first screw jack 151 outputs lifting power to the screw 152. The screw 152 pushes the floating lower punch module 163 to slide upward along the lower guide post 165 through the lower electrode 115 of the lifting power supply unit 11. The floating lower punch module 163 contacts and pushes the floating mold module 162 and the sintering sample raw material 166 to slide upward along the upper guide post 164. The sintering pressure generating unit 12 outputs downward moving force to the sintering piston rod 122 through its sintering hydraulic cylinder 121. The sintering piston rod 122 pushes the sintering upper punch 114 through the upper electrode 113 of the power supply unit 11, outputting pressure to the upper surface of the sintering sample material 166. The power supply unit 11 outputs the current generated by the current generating device 111 to the upper and lower surfaces of the sintering sample material 166 through the wires 112, the upper electrode 113, and the lower electrode 115. The sintering conveying unit 17 realizes the overall station switching of the sintering unit 16, and the electrode cooling unit 18 contacts and cools the sintering upper punch 114. The floating design of the floating mold module 162 and the floating lower punch module 163, which are detached from the sintering platform 161, avoids the problem of the upper and lower presses transmitting axial pressing force to the sintering platform 161 during the sintering pressing process, thereby avoiding the risk of the sintering platform 161 overturning and ensuring the stability of the sintering pressing process.

[0125] The sintering vacuum unit 14 includes a sintering vacuum chamber body 141 and a first vacuum chamber support 145. The sintering vacuum chamber body 141 is connected to the vacuum transfer module 6 via first vacuum gate valves 142 fixed on both sides to provide a vacuum environment for the sintering module 1. A sliding sealing ring 143 is provided between the sintering vacuum chamber body 141 and the upper electrode 113 and lower electrode 115. A sintering vacuum chamber door 144 for maintenance is also provided on the outside of the sintering vacuum chamber body 141. The first vacuum chamber support 145 fixes the sintering vacuum chamber body 141 to the first support frame 13. During maintenance, closing the first vacuum gate valves 142 disconnects the sintering module 1 from other modules, reducing the time other modules are exposed to non-vacuum conditions, shortening the re-vacuuming time, and improving production efficiency.

[0126] The sintering conveying unit 17 is equipped with a guide rail 172, a driving slider 173, and a driven slider 174. The guide rail 172 is fixedly connected to the sintering vacuum chamber body 141 via a guide rail fixing block 171. The upper sides of the driving slider 173 and the driven slider 174 are fixedly connected to both sides of the sintering platform 161, respectively, and the lower sides are slidably connected to the guide rail 172. The driving slider 173 drives the sintering unit 16 to operate between various modules, realizing the overall workstation switching of the sintering unit, avoiding the coordination misalignment caused by single-point floating, and reducing the intervention of the robotic arm compared with the traditional SPS feeding system, thus significantly improving the theoretical production capacity.

[0127] The electrode cooling unit 18 is equipped with a cooling copper block 181, a lead screw drive motor 182, and an electrode cooling unit support frame 184. The lead screw drive motor 182 drives a bidirectional lead screw 183 to move the cooling copper block 181 towards the intermediate sintering upper punch 114, ultimately achieving tight contact and rapid cooling of the sintering upper punch 114. The electrode cooling unit support frame 184 fixes the electrode cooling unit 18 onto the sintering vacuum chamber body 141. The electrode cooling unit 18 avoids the risk of overheating failure of the sintering upper punch 114 during high-frequency voltage control, thus improving the stability of the sintering process.

[0128] Working principle: Before sintering, the drive slider 173 pulls the sintering unit 16 from the second graphite paper automatic pressing and replacement module 5 through the vacuum transfer module 6 to the sintering module 1, and moves it along the guide rail 172 to the sintering station (directly below the upper electrode 113). During sintering, the first screw jack 151 of the first lifting unit 15 first receives the power output from the motor to push the screw 152 upward, causing the lower electrode 115 to move upward through the sintering vacuum chamber body 141 until it contacts the lower end of the floating lower punch module 163. At this time, the lower electrode 115 continues to move upward, pushing the floating lower punch module 163 to slide upward along the lower guide post 165 for a certain distance. At the same time, the floating lower punch module 163 pushes the floating mold module 162 and the sintering sample raw material 166 in contact with it to slide upward along the upper guide post 164 for a certain distance, so that the floating lower punch module 163 and the floating mold module 162 are separated from the sintering platform 161. Next, the sintering hydraulic cylinder 121 of the sintering pressure generating unit 12 pushes the sintering piston rod 122 downward. The sintering piston rod 122 pushes the sintering upper punch 114, which is fixedly connected to the sintering piston rod 122 via the upper electrode 113, downward until the sintering upper punch 114 contacts the upper surface of the sintering sample material 166. The sintering hydraulic cylinder 121 outputs pressure to the sintering sample material 166 through the sintering piston rod 122, the upper electrode 113, and the sintering upper punch 114. At this time, the power supply unit 11 outputs the current generated by the current generating device 111 to the upper and lower surfaces of the sintering sample material 166 through the wires 112, the upper electrode 113, and the lower electrode 115, completing the sintering of the sample. After sintering is completed, the upper electrode 113 and the lower electrode 115 return to their initial positions, and the floating lower punch module 163 and the floating mold module 162 fall back to their original positions. At this time, the lead screw drive motor 182 drives the bidirectional lead screw 183 to move the cooled copper block 181 towards the middle sintering upper punch 114 and finally achieve a tight fit, realizing the rapid cooling of the sintering upper punch 114. The drive slider 173 drives the sintering unit 16 to move to the other side and through the first vacuum gate valve 142 and vacuum transfer module 6 to the demolding and sampling module 2.

[0129] During maintenance, the first vacuum gate valve 142 is closed, disconnecting the sintering module 1 from other modules. After the vacuum is broken, the sintering vacuum chamber door 144 is opened. At this time, the other modules are still under vacuum. After maintenance is completed, the sintering vacuum chamber door 144 is closed and a vacuum is evacuated. When the vacuum level of the sintering module 1 is consistent with that of the other modules, the first vacuum gate valve 142 is opened to restore normal operation.

[0130] Reference Figures 8-11The demolding and sampling module 2 includes a demolding and sampling vacuum unit 22, a demolding pressure generating unit 24, a second lifting unit 25, and a second support frame 26. It also includes a sample collection and electrode cleaning unit 21, a demolding and sampling conveying unit 23, and a mold lifting frame 27. The second support frame 26 fixes the demolding pressure generating unit 24, the second lifting unit 25, and the demolding and sampling vacuum unit 22. The demolding and sampling vacuum unit 22 is equipped with a demolding vacuum box 221 and a sampling vacuum box 222. The second lifting unit 25 is equipped with a second screw jack 251 and a mold frame lifting rod 252. The second screw jack 251 lifts the fixedly connected lifting mold frame 27 through the mold frame lifting rod 252. The lifting mold frame 27 is equipped with a first mold frame platform 271 and a second mold frame platform 272. The first mold frame platform 271 passes through the first limiting groove 273 and lifts the floating mold module 162 through the floating lower punch module 163. It slides up to a set height along the upper guide post 164 and the extended guide post 229 fixed on the demolding vacuum box 221. The sample collection chute 211 and the cleaning sand belt 212 of the sample collection and electrode cleaning unit 21 slide through the second limiting groove 274 of the first mold frame platform 271 to the bottom of the floating mold module 162. The demolding pressure generating unit 24 outputs downward moving force to the demolding punch 242 through its demolding hydraulic cylinder 241. The demolding punch 242 outputs pressure to the upper surface of the sintered sample product 167 through the demolding punch 243 fixedly connected to it, and pushes the sintered sample product 167 to slide relative to the inner wall of the floating mold module 162, thereby completing the demolding. The sample collection chute 211 receives the demolded sintered sample product 167. The cleaning sand belt 212 cleans the upper surface of the floating lower punch module 163, which slides up along the lower guide post 165 and is lifted by the second mold frame platform 272. The cleaning brush 244, which is set between the demolding punch 242 and the demolding punch 243, simultaneously cleans the inner wall of the floating mold module 162. The sampling vacuum box 222 collects the sintered sample product 167 received by the sample collection chute 211. The demolding and sampling transfer unit 23 completes the overall station switching of the sintering unit 16. The conveying unit significantly reduces the time required for the sintering unit 16 to transfer from the sintering module 1 to the demolding and sampling module 2, enabling the sintered sample 167 to be rapidly demolded at high temperatures (high-temperature online demolding treatment). This not only reduces the risk of sample breakage during demolding but also avoids sample or mold breakage caused by the difference in expansion coefficients between the sample and the mold during rapid cooling. Furthermore, this process integrates demolding, sample collection, punch cleaning, and mold cleaning into a compact and highly automated system. Synchronous cleaning of the punch and mold improves their lifespan and ensures the quality of sample sintering.

[0131] The demolding and sampling vacuum unit 22 is also equipped with a second vacuum gate valve 223, a sampling vacuum gate valve 224, a second vacuum chamber bracket 225, and a support plate 228. The second vacuum gate valve 223 is fixedly installed on both sides of the demolding vacuum chamber 221 and connected to the vacuum transfer module 6 to provide a vacuum environment for the demolding and sampling module 2. The sampling vacuum gate valve 224 is fixedly installed between the demolding vacuum chamber 221 and the sampling vacuum chamber 222, isolating the demolding vacuum chamber 221 and the sampling vacuum chamber 222. The second vacuum chamber bracket 225 fixes the demolding vacuum chamber 221 to the second support frame 26, and the support plate 228 fixes the extended guide column 229 to the demolding vacuum chamber 221. The demolding vacuum chamber 221 is provided with a demolding vacuum chamber door 226 for maintenance, and the sampling vacuum chamber 222 is provided with a sampling vacuum chamber door 227 for collecting sintered sample finished products 167. The sampling vacuum chamber 222 and the sampling vacuum gate valve 224 enable the demolding vacuum chamber 221 to complete the sampling work without breaking the vacuum, thus not disrupting the production rhythm and improving production efficiency.

[0132] The sample collection and electrode cleaning unit 21 also includes a chute servo electric cylinder 213, a chute push rod 214, a sample collection and electrode cleaning module support leg 215, and a sanding belt drive wheel 217. The chute push rod 214 is connected to the end of the sample collection chute 211 via a spherical bearing. The chute push rod 214 receives the horizontal thrust from the chute servo electric cylinder 213 at the end of the sample collection chute 211. The sample collection chute 211 completes its steering and translational movements by means of a guide bearing 216 fixed to the upper end of the sample collection and electrode cleaning module support leg 215. The sanding belt drive wheel 217 drives the cleaning sanding belt 212 to rotate.

[0133] Working principle: The sintering unit 16, containing the sintered sample product 167, from the sintering module 1, moves along the demolding and sampling conveying unit 23 to the demolding station (directly below the demolding punch 243) under the traction of the drive slider 173. During demolding, the second screw jack 251 of the second lifting unit 25 receives power from the servo motor and lifts the lifting mold frame 27, which is fixedly connected to the mold frame lifting rod 252, through the mold frame lifting rod 252. The first limiting groove 273 of the lifting mold frame 27 allows the first mold frame platform 271 to pass through the floating lower punch module 163 and contact the lower surface of the floating mold module 162. The lifting mold frame 27 continues to rise, pushing the floating mold module 162 from the upper guide post 164 to the set height of the extended guide post 229. At this time, the second mold frame platform 272 contacts the lower surface of the floating lower punch module 163. The sample collection chute 211 and cleaning sand belt 212 of the sample collection and electrode cleaning unit 21 are fixedly connected together by a support column. To avoid interference between the sample collection and electrode cleaning unit 21 and the lifting mold frame 27, the lifting mold frame 27 is machined with a second limiting groove 274. When the floating mold module 162 rises to the set height, the chute servo electric cylinder 213 outputs a horizontal thrust pointing towards the sintering unit 16 through the chute push rod 214 to the end of the sample collection chute 211. The sample collection chute 211 first rotates against the guide bearing 216 until the sample collection chute 211 and the cleaning sand belt 212 reach a horizontal state. Then, the sample collection chute 211 and the cleaning sand belt 212 reach directly below the demolding punch 243 under the push of the chute push rod 214. At this time, the second mold platform 272 continues to rise, pushing the floating lower punch module 163 to slide up along the lower guide post 165 until it is in close contact with the cleaning sand belt 212. The sand belt drive wheel 217 drives the cleaning sand belt 212 to rotate and clean the upper surface of the floating lower punch module 163. Next, the demolding hydraulic cylinder 241 outputs pressure on the upper surface of the sintered sample product 167 through the demolding punch 242 and the demolding punch 243, pushing the sintered sample product 167 down the inner wall of the floating mold module 162 until it detaches from the floating mold module 162 and falls into the sample collection chute 211, completing the demolding. At the same time as demolding, the cleaning brush 244 slides relative to the inner wall of the floating mold module 162 to clean the inner surface of the mold. After demolding and cleaning are completed, all parts return to the initial position. When the sample collection chute 211 rotates from horizontal to vertical, the sintered sample product 167 slides along the sample collection chute 211 into the sampling vacuum box 222 located directly below. The drive slider 173 drives the sintering unit 16 to move to the other side and through the second vacuum gate valve 223 and vacuum transfer module 6 to the first graphite paper automatic pressing and replacement module 3.

[0134] When the sampling vacuum chamber 222 has collected a certain number of sintered sample products 167, the sampling vacuum gate valve 224 is closed to isolate the demolding vacuum chamber 221 from the sampling vacuum chamber 222. The vacuum in the sampling vacuum chamber 222 is then released, and the sampling vacuum chamber door 227 is opened to complete the product collection operation. After the product collection is completed, the sampling vacuum chamber door 227 is closed and a vacuum is drawn. When the vacuum levels of the sampling vacuum chamber 222 and the demolding vacuum chamber 221 are consistent, the sampling vacuum gate valve 224 is opened.

[0135] During maintenance, the second vacuum gate valve 223 is closed, disconnecting the demolding and sampling module 2 from other modules. After breaking the vacuum, the demolding vacuum chamber door 226 is opened, while the other modules remain under vacuum. After maintenance, the demolding vacuum chamber door 226 is closed and a vacuum is drawn. Once the vacuum level of the demolding and sampling module 2 is consistent with that of the other modules, the second vacuum gate valve 223 is opened to restore normal operation.

[0136] Reference Figures 12-17The first graphite paper automatic pressing and replacement module 3 includes a graphite paper automatic pressing and replacement vacuum unit 33, a graphite paper automatic pressing and replacement conveying unit 34, a graphite paper automatic pressing pressure generating unit 37, a third support frame 38, and a third lifting unit 39. It also includes a graphite paper winding working unit 31, a graphite paper winding spare unit 32, a graphite paper hollow punching unit 35, and a graphite paper replacement transmission guide rail 36. The third support frame 38 fixes the graphite paper automatic pressing and replacement vacuum unit 33, the graphite paper automatic pressing pressure generating unit 37, and the third lifting unit 39. The graphite paper automatic pressing and replacement vacuum unit 33 is equipped with a graphite paper automatic pressing vacuum box 331 and a graphite paper automatic replacement vacuum box 332. The third lifting unit 39 is equipped with a third screw jack 391 and a graphite paper pressing support base 392. The third screw jack 391 receives power from the servo motor and lifts the floating lower punch module 163 and floating mold module 162 contained in the sintering unit 16 through the graphite paper pressing support base 392, so that the floating lower punch module 163 and floating mold module 162 are detached from the sintering platform 161. The graphite paper winding working unit 31 is equipped with graphite paper 311, graphite paper recycling roll 312, graphite paper storage roll 313 and graphite paper roll drive motor 318. The graphite paper roll drive motor 318, which is fixed to the graphite paper automatic pressing vacuum box 331 through the motor support plate 319, drives the graphite paper recycling roll 312 to transport the new graphite paper 311 in the graphite paper storage roll 313 to the middle of the graphite paper hollow punching unit 35 and the sintering unit 16. The graphite paper hollow punching unit 35 is equipped with a graphite paper pusher 351, a punch return spring 352, and a hollow punch 353. The two ends of the punch return spring 352 are fixedly connected to the graphite paper pusher 351 and the hollow punch 353, respectively. The graphite paper automatic pressing pressure generating unit 37 outputs pressing force to the graphite paper pusher 351. The graphite paper pusher 351 drives the entire graphite paper hollow punching unit 35 to move downwards until the hollow punch 353 contacts the graphite paper 311 in the sintering unit 16. The punch return spring 352 transmits the pressing force output by the graphite paper pusher 351 to the hollow punch 353. The hollow punch 353 punches graphite paper sheets of a fixed specification, and the graphite paper pusher 351 presses the graphite paper sheets into the floating mold module 162 at a set depth. The graphite paper automatic pressing and changing conveyor unit 34 completes the overall station switching of the sintering unit 16. The integrated hollow punching and elastic pressing design adopts a graphite paper hollow punching module that integrates punching and pressing functions. Combined with a return spring to transmit and adjust the pressure, it realizes the continuous and precise punching and deep pressing in one set of actions, ensuring the forming quality and positional accuracy of graphite paper sheets, and significantly improving the quality stability and repeatability of sintered samples.

[0137] The graphite paper replacement transmission guide rail 36 is equipped with a first transmission module 361, a second transmission module 362, a first replacement module 363, and a second replacement module 364. The graphite paper winding unit 31 and the self-driven slider 3622 of the second transmission module 362 are magnetically connected through a magnetic switch base 317, which is fixedly connected to the graphite paper winding unit 31. When the graphite paper in the graphite paper reserve roll 313 is used up, the first transmission module 361 drives the second transmission slide rail 3621, which is fixedly connected to the L-shaped support slider 3612, to move along the first transmission slide rail 3611 to the height of the first replacement guide rail 3631 set in the first replacement module 363. The self-driven slider 3622 set in the second transmission module 362 transports the graphite paper winding unit 31 to move along the second transmission slide rail 3621 to the first replacement guide rail 3631. The first push rod 3633 set in the first replacement module 363 pushes the magnetic switch lever 3171 to switch the magnetic state of the magnetic switch base 317 from ON to OFF. The self-driven slider 3622 disconnects the magnetic connection with the graphite paper winding unit 31. The first push rod 3633 is fixedly connected to the replacement module support plate 365 through the first push rod support plate 3634. The self-driven slider 3622 moves back to the second transmission slide rail 3621. The first transmission module 361 drives the second transmission slide rail 3621 to move to the height of the second replacement guide rail 3641 set in the second replacement module 364. The self-driven slider 3622 moves along the second transmission slide rail 3621 to below the graphite paper winding spare unit 32. The second push rod 3643 set in the second replacement module 364 pushes the magnetic switch lever 3171 to realize the magnetic connection between the graphite paper winding spare unit 32 and the self-driven slider 3622. The self-driven slider 3622 drives the graphite paper winding spare unit 32 back onto the second transmission slide rail 3621. The first transmission module 361 and the second transmission module 362 work together to control the graphite paper winding spare unit 32 to move to the graphite paper pressing position. The second push rod 3643 is fixedly connected to the replacement module support plate 365 through the second push rod support plate 3644. The first transmission slide rail 3611 is fixed inside the automatic graphite paper pressing vacuum box 331 via an L-shaped slide rail support plate 3613. The first replacement guide rail 3631 and the second replacement guide rail 3641 are fixed inside the automatic graphite paper changing vacuum box 332 via a changing module support plate 365. The magnetically coupled quick-change module enables rapid connection and separation between the working unit and the conveying module via a magnetic switch base. Combined with the dual guide rail changing module and push rod control system, it realizes automatic and rapid switching between the graphite paper winding working unit and the standby unit, ensuring the continuity of production.

[0138] The automatic graphite paper pressing and replacement vacuum unit 33 is also equipped with a graphite paper replacement vacuum gate valve 335, a third vacuum gate valve 336, and a third vacuum box bracket 337. The third vacuum gate valve 336 is fixedly installed on both sides of the automatic graphite paper pressing vacuum box 331 and connected to the vacuum transfer module 6 to provide a vacuum environment for the first automatic graphite paper pressing and replacement module 3. The graphite paper replacement vacuum gate valve 335 is fixedly installed between the automatic graphite paper pressing vacuum box 331 and the automatic graphite paper replacement vacuum box 332, isolating the automatic graphite paper pressing vacuum box 331 and the automatic graphite paper replacement vacuum box 332. The third vacuum box bracket 337 fixes the automatic graphite paper pressing vacuum box 331 and the automatic graphite paper replacement vacuum box 332 on the third support frame 38. The automatic graphite paper pressing vacuum box 331 is equipped with a maintenance door 333 on its exterior, and the automatic graphite paper replacement vacuum box 332 is equipped with a door 334 for replacing the old graphite paper winding unit 31 that stores and replaces old graphite paper. The automatic graphite paper replacement vacuum box 332 and the graphite paper replacement vacuum valve 335 enable the automatic graphite paper pressing vacuum box 331 to replace the old and new graphite paper winding unit 31 without breaking the vacuum, thus maintaining the production rhythm and improving production efficiency.

[0139] like Figure 16 As shown in the exploded view of the graphite paper winding unit, the graphite paper winding unit 31 is also equipped with a guide roller 314, an L-shaped support base 315, and a U-shaped support plate 316. The guide roller 314 is fixedly connected to the U-shaped support plate 316 by a fixing nut 3141. The bottom of the L-shaped support base 315 is fixedly connected to the magnetic switch base 317, and a first support rod 3152 is provided in the middle. The first support rod 3152 is fixedly connected to the graphite paper storage roll 313 and connected to the L-shaped support base 315 by a first flange bearing 3151. An auxiliary support plate 3153 is also provided at the bottom of the L-shaped support base 315 to help fix the graphite paper storage roll 313. One side of the U-shaped support plate 316 is fixedly connected to the L-shaped support base 315, and the other side is provided with a second support rod 3162. The second support rod 3162 is fixedly connected to the graphite paper recycling roll 312 and connected to the U-shaped support plate 316 through a second flange bearing 3161. A gear is provided at the end of the second support rod 3162, which meshes with the gear on the graphite paper roll drive motor 318. The graphite paper reserve roll 313 is guided by the guide roller 314 to transport new graphite paper to the graphite paper recycling roll 312.

[0140] The upper surface of the magnetic switch base 317 is fixedly connected to the L-shaped support base 315, and the lower surface is magnetically connected to the self-driven slider 3622. The magnetic switch base 317 is also provided with a fixed slide groove 3172, which is slidably connected to the first support slide rail 3632 and the second support slide rail 3642, alternately supporting the graphite paper winding working unit 31 and the graphite paper winding spare unit 32. The first support slide rail 3632 and the second support slide rail 3642 are respectively fixedly connected to the first replacement guide rail 3631 and the second replacement guide rail 3641.

[0141] Working principle: The sintering unit 16, after being cleaned by the cleaning brush 244, is moved along the graphite paper automatic pressing and replacement conveying unit 34 to the graphite paper pressing station (directly below the graphite paper hollow punching unit 35) under the traction of the drive slider 173. During the automatic pressing of graphite paper, the third screw jack 391 set in the third lifting unit 39 receives the power output from the servo motor to lift the graphite paper pressing support base 392 fixedly connected to it. The graphite paper pressing support base 392 lifts the floating lower punch module 163, and the floating lower punch module 163 lifts the floating mold module 162. At this time, the floating lower punch module 163 and the floating mold module 162 are separated from the sintering platform 161. The graphite paper roll drive motor 318 drives the graphite paper recycling roll 312 via gears to wind up the old graphite paper 311 after the previous punching, while simultaneously conveying the new graphite paper 311 in the graphite paper reserve roll 313 to the space between the hollow graphite paper punching unit 35 and the sintering unit 16. Under the combined drive of the first transmission module 361 and the second transmission module 362, the new graphite paper 311 is now in close contact with the upper surface of the floating mold module 162. The graphite paper push rod 351 receives the pressing force output from the graphite paper automatic pressing pressure generating unit 37, which drives the hollow punch 353 downward through the punch return spring 352 until the hollow punch 353 contacts the graphite paper 311 in the sintering unit 16. The graphite paper pusher 351 continues to move downwards, transmitting the pressing force to the hollow punch 353 via the punch return spring 352. The blade at the head of the hollow punch 353 cuts out graphite paper sheets of a fixed size. At this point, the graphite paper pusher 351 continues to move downwards, pushing the graphite paper sheets into the floating mold module 162 at a set depth. After the graphite paper sheets are laid, all components return to their original positions. The drive slider 173 drives the sintering unit 16 to move to the other side and through the third vacuum gate valve 336 and the vacuum transfer module 6 to the powder loading and pre-pressing module 4.

[0142] When the graphite paper in the graphite paper reserve roll 313 is used up, the first transmission slide rail 3611 drives the L-shaped support slider 3612 to move upward. The L-shaped support slider 3612 carries the second transmission slide rail 3621 upward until the second transmission slide rail 3621 is aligned with the first replacement guide rail 3631. At this time, the servo motor on the self-driven slider 3622 drives the self-driven slider 3622 to move the graphite paper winding working unit 31, which is magnetically connected to it, onto the first replacement guide rail 3631 until the fixed slide groove 3172 slides into contact with the first support slide rail 3632 and aligns. At this time, the first push rod 3633 set in the first replacement module 363 pushes the magnetic switch lever 3171 to switch the magnetic state of the magnetic switch base 317 from ON to OFF. The self-driven slider 3622 disconnects the magnetic connection with the graphite paper winding working unit 31. The graphite paper winding working unit 31 remains on the first support slide rail 3632, while the self-driven slider 3622 returns to the second transmission slide rail 3621. The first transmission slide rail 3611 continues to lift the second transmission slide rail 3621 upwards via the L-shaped support slider 3612 until the second transmission slide rail 3621 is aligned with the second replacement guide rail 3641. The self-driven slider 3622 slides onto the second replacement guide rail 3641 until it is directly below the graphite paper winding spare unit 32. The second push rod 3643 of the second replacement module 364 pushes the magnetic switch lever 3171 to switch the magnetic state of the magnetic switch base 317 from OFF to ON, realizing the magnetic connection between the graphite paper winding spare unit 32 and the self-driven slider 3622. The self-driven slider 3622 drives the graphite paper winding spare unit 32 back onto the second transmission slide rail 3621. The first transmission module 361 and the second transmission module 362 work together to control the graphite paper winding spare unit 32 to move to the graphite paper pressing position, completing the replacement of the graphite paper winding module.

[0143] After the graphite paper winding module is replaced, close the graphite paper replacement vacuum valve 335 to isolate the automatic graphite paper laying vacuum box 331 and the automatic graphite paper replacement vacuum box 332. Remove the automatic graphite paper replacement vacuum box 332, open the door 334, and remove the old graphite paper winding unit 31 from the first support slide rail 3632. Replace the new graphite paper winding unit 31 on the second support slide rail 3642. After replacement, close the door 334 and evacuate the vacuum. When the vacuum levels of the automatic graphite paper laying vacuum box 331 and the automatic graphite paper replacement vacuum box 332 are consistent, open the vacuum valve 335 to begin the next cycle.

[0144] During maintenance, close the third vacuum gate valve 336, disconnect the first automatic graphite paper pressing and replacement module 3 from other modules, and after breaking the vacuum, open the automatic graphite paper pressing vacuum chamber door 333. At this time, the other modules are still in a vacuum state. After maintenance is completed, close the automatic graphite paper pressing vacuum chamber door 333. After the vacuum level of the first automatic graphite paper pressing and replacement module 3 and other modules reaches the same level, open the third vacuum gate valve 336 to restore normal operation.

[0145] Reference Figures 18-20The powder loading and pre-pressing module 4 includes a powder loading and pre-pressing vacuum unit 44, a powder loading and pre-pressing pressure generating unit 46, a fourth support frame 47, and a fourth lifting unit 48. It also includes a pre-pressing unit 41, a powder loading unit 42, a vacuum storage unit 43, and a powder loading and pre-pressing conveying unit 45. The fourth support frame 47 fixes the powder loading and pre-pressing vacuum unit 44, the powder loading and pre-pressing pressure generating unit 46, and the fourth lifting unit 48. The fourth lifting unit 48 is equipped with a fourth screw jack 481 and a pre-pressing base 482. The fourth screw jack 481 receives power from the servo motor and lifts the floating lower punch module 163 and the floating mold module 162 included in the sintering unit 16 through the pre-pressing base 482, so that the floating lower punch module 163 and the floating mold module 162 are detached from the sintering platform 161. The pre-pressing unit 41 is equipped with a green billet pressure rod 411, an auxiliary material cylinder 412, a material cylinder return spring 413, and an extension material tube 414. The upper and lower sides of the material cylinder return spring 413 are in contact with the green billet pressure rod 411 and the auxiliary material cylinder 412, respectively. The powder loading and pre-pressing pressure generating unit 46 is equipped with a powder loading and pre-pressing servo hydraulic cylinder 461 and an extension pressure rod 462. The powder loading and pre-pressing servo hydraulic cylinder 461 outputs pressing force to the green billet pressure rod 411 through the extension pressure rod 462. The green billet pressure rod 411 drives the auxiliary material cylinder 412 and the extension material tube 414 to move downward through the material cylinder return spring 413 until the auxiliary material cylinder 412 is in close contact with the upper surface of the floating mold module 162. The powder loading unit 42 is equipped with an internal storage cylinder 421 and a quantitative injection valve 422. The vacuum storage unit 43 is equipped with a vacuum storage silo 431 and a vacuum discharge valve 432. The internal storage cylinder 421, which is fixed to the powder loading and pre-pressing vacuum unit 44 by the internal storage cylinder support column 423, receives the powder stored in the vacuum storage silo 431 when the vacuum discharge valve 432 is opened. The quantitative injection valve 422 quantitatively delivers the powder into the mold of the floating mold module 162 and the auxiliary cylinder 412 through the extended material pipe 414. The powder is pressed on top of the graphite paper pressed by the first graphite paper automatic pressing and replacement module 3. The green blank pressing rod 411 transmits the pressing force of the powder loading and pre-pressing servo hydraulic cylinder 461 to the upper surface of the powder to complete the pressing of the green blank. The drive slider 173 drives the sintering unit 16 to switch the overall work position along the powder loading and pre-pressing conveyor unit 45. This device integrates vacuum powder preparation, powder loading, and pre-pressing. The design of the auxiliary material cylinder 412 allows the loose powder to be temporarily stored in the auxiliary material cylinder 412, and then pressed into the floating mold module 162 by the green blank pressing rod 411. This greatly reduces the height of the floating mold module 162, thereby shortening the length of the sintering upper punch 114. The reduction in the length-to-diameter ratio of the sintering upper punch 114 improves its ability to resist deformation under high current, high temperature, and high pressure, and increases the service life of the sintering upper punch 114.

[0146] The powder loading and pre-pressurization vacuum unit 44 is equipped with a powder loading and pre-pressurization vacuum chamber 441, a receiving sealing flange 443, a fourth vacuum gate valve 444, and a fourth vacuum chamber bracket 445. The fourth vacuum gate valve 444 is fixedly installed on both sides of the powder loading and pre-pressurization vacuum chamber 441 and connected to the vacuum transfer module 6 to provide a vacuum environment for the powder loading and pre-pressurization module 4. The fourth vacuum chamber bracket 445 fixes the powder loading and pre-pressurization vacuum chamber 441 on the fourth support frame 47. The receiving sealing flange 443 seals and installs the vacuum storage unit 43 on the powder loading and pre-pressurization vacuum chamber 441. A maintenance door 442 is provided on the outside of the powder loading and pre-pressurization vacuum chamber 441.

[0147] Working principle: The sintering unit 16, which has graphite paper laid on it, is pulled by the drive slider 173 along the powder loading and pre-pressing conveyor unit 45 to the powder loading and pre-pressing station (directly below the auxiliary material cylinder 412). During powder loading and pre-pressing, the fourth screw jack 481 receives power from the servo motor and lifts the floating lower punch module 163 through the pre-pressing base 482. The floating lower punch module 163 contacts the lifting floating mold module 162, so that the floating lower punch module 163 and the floating mold module 162 are separated from the sintering platform 161. The pre-pressing base 482 provides stable support for the powder loading and pre-pressing process. The green compact pressure rod 411 receives power from the powder loading and pre-pressing servo hydraulic cylinder 461, which drives the auxiliary material cylinder 412 and the extension tube 414 downwards via the material cylinder return spring 413 until the auxiliary material cylinder 412 is in close contact with the upper surface of the floating mold module 162. At this time, the green compact pressure rod 411 continues to move downwards until it just enters the floating mold module 162. The auxiliary material cylinder 412 is in close contact with the upper surface of the floating mold module 162 due to the compression of the material cylinder return spring 413. With the vacuum discharge valve 432 closed, the vacuum storage bin 431 is filled with powder and then evacuated. When the vacuum level in the vacuum storage silo 431 and the vacuum level in the powder loading and pre-compression vacuum box 441 reach the same level, the vacuum discharge valve 432 is opened. At this time, the powder in the vacuum storage silo 431 falls into the storage cylinder 421 inside the box due to its own gravity. After the powder in the vacuum storage silo 431 is emptied, the vacuum discharge valve 432 is closed, and the vacuum in the vacuum storage silo 431 is de-vacuumed to enter the next cycle of powder loading. The quantitative injection valve 422 releases the powder in the storage cylinder 421 inside the box according to the programmed requirements. The powder enters the floating mold module 162 mold and auxiliary cylinder 412 through the extended material pipe 414, and the powder is pressed on top of the graphite paper pressed by the first graphite paper automatic pressing and replacement module 3. At this time, the green compact pressing rod 411 continues to move downward to press the loose powder into a high-density green compact. After the powder loading and pre-compression are completed, all components return to their initial positions. The drive slider 173 drives the sintering unit 16 to move to the other side and through the fourth vacuum gate valve 444 and vacuum transfer module 6 to the second graphite paper automatic pressing and replacement module 5.

[0148] During maintenance, the fourth vacuum gate valve 444 is closed, disconnecting the powder loading and pre-compression module 4 from other modules. After breaking the vacuum, the powder loading and pre-compression vacuum chamber door 442 is opened. At this time, other modules are still under vacuum. After maintenance is completed, the powder loading and pre-compression vacuum chamber door 442 is closed and a vacuum is evacuated. Once the vacuum level of the powder loading and pre-compression module 4 is consistent with that of other modules, the fourth vacuum gate valve 444 is opened to restore normal operation.

[0149] The sintering unit 16, containing the green blank, is moved to the working position of the second graphite paper automatic pressing and replacement module 5 under the traction of the drive slider 173. The second graphite paper automatic pressing and replacement module 5 presses the second sheet of graphite paper onto the green blank. The drive slider 173 drives the sintering unit 16 back into the sintering module 1 to start the next cycle of flash sintering.

[0150] Reference Figure 21 The vacuum transfer module 6 is equipped with a vacuum transfer chamber 61 and a transfer guide rail 62. The vacuum transfer chamber 61 connects to the sealing sintering module 1, the demolding and sampling module 2, the first graphite paper automatic pressing and replacement module 3, the powder loading and pre-pressing module 4, and the second graphite paper automatic pressing and replacement module 5. The transfer guide rail 62 connects to the conveying units of each module, providing a continuous track for the sintering unit 16.

[0151] A streamlined flash sintering method, using the aforementioned streamlined flash sintering system, includes the following steps:

[0152] S1. Vacuum Acquisition: Open the vacuum gate valve of each working module, connect each working module, and then use a vacuum pump to evacuate each working module to the target vacuum level.

[0153] S2, Laying the first layer of graphite paper: After cleaning or when a new sintering unit 16 is moved to the graphite paper laying station via the automatic graphite paper laying and replacement conveyor unit 34. The third lifting unit 39 lifts the floating lower punch module 163 and the floating mold module 162 away from the sintering platform 161. The graphite paper winding unit 31 conveys new graphite paper 311 to the top of the floating mold module 162. The graphite paper hollow punching unit 35 punches out graphite paper sheets of a fixed specification and lays them in the floating mold module 162 at a set depth.

[0154] S3. Powder Loading and Pre-pressing: The sintering unit 16, with the first layer of graphite paper laid on it, moves along the powder loading and pre-pressing conveyor unit 45 to the powder loading and pre-pressing station. The fourth lifting unit 48 lifts the floating lower punch module 163 and the floating mold module 162 away from the sintering platform 161. The vacuum storage unit 43 conveys the powder to the powder loading unit 42. The powder loading unit 42 stores the powder and releases it quantitatively into the floating mold module 162 and the auxiliary material cylinder 412. The green blank pressure rod 411 presses down to complete the pressing of the green blank.

[0155] S4. Pressing the second layer of graphite paper: The sintering unit 16 containing the green blank is moved to the working position of the automatic graphite paper pressing and replacement module 5 under the traction of the drive slider 173. The automatic graphite paper pressing and replacement module 5 presses the second sheet of graphite paper on top of the green blank.

[0156] S5, Sintering: The sintering unit 16, containing the green blank and graphite paper, moves to the sintering station under the traction of the drive slider 173. The first lifting unit 15 lifts the floating lower punch module 163 and the floating mold module 162 away from the sintering platform 161. The floating lower punch module 163 and the sintering upper punch 114 transmit axial pressing force to the sintering sample raw material 166 through the first layer of graphite paper and the second layer of graphite paper, respectively. The power supply unit 11 forms a closed circuit with the sintering sample raw material 166 through the floating lower punch module 163 and the sintering upper punch 114. The powder particles are bonded together by flash high-temperature sintering to form the sintered sample finished product 167.

[0157] S6. Demolding and Sampling: The sintering unit 16, containing the sintered sample product 167, moves to the demolding and sampling station under the traction of the drive slider 173. The second lifting unit 25 lifts the floating mold module 162 to the demolding station via the lifting mold frame 27. The demolding punch 243 punches the upper surface of the sintered sample product 167 to detach it from the floating mold module 162. The cleaning brush 244 simultaneously cleans the inner wall of the floating mold module 162. The sample collection and electrode cleaning unit 21 moves to the sampling station under the push of the slide push rod 214 and relies on the guide bearing 216. The sample collection slide 211 receives the sintered sample product 167, and the cleaning sand belt 212 cleans the upper surface of the floating lower punch module 163. The sampling vacuum box 222 collects the sintered sample product 167 received by the sample collection slide 211 and completes the sampling through the sampling vacuum box door 227.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipelined flash sintering system, characterized by, The system comprises a powder filling and pre-pressing module (4), a first graphite paper automatic pressing and replacing module (3), a sintering module (1), a demolding and sampling module (2) and a second graphite paper automatic pressing and replacing module (5) arranged in sequence along the direction of material flow; the modules are connected through a vacuum switching module (6) to form a continuous vacuum environment; The sintering module (1) comprises a sintering unit (16); The system further comprises a conveying system for driving the sintering unit (16) carrying the material to sequentially flow between the modules; The powder filling and pre-pressing module (4) is used for quantitatively filling powder into a mold in the sintering unit (16) and pre-pressing the powder into a green body; The first graphite paper automatic pressing and replacing module (3) is used for pressing a first layer of graphite paper below the green body; The second graphite paper automatic pressing and replacing module (5) is used for pressing a second layer of graphite paper above the green body; The sintering module (1) is used for applying pressure and current to the green body sandwiched between the two layers of graphite paper to perform flash sintering and form a sintered product; The demolding and sampling module (2) is used for ejecting the sintered product from the mold and simultaneously cleaning the inner wall of the mold and the end face of the punch, while collecting the sintered product; The vacuum switching module (6) is used for connecting the vacuum chambers of the modules and providing a conveying track for the sintering unit (16); The sintering module (1) comprises a first support frame (13); The sintering module (1) further comprises a power supply unit (11), a sintering pressure generating unit (12), a sintering vacuum unit (14), a first lifting unit (15), a sintering unit (16), a sintering conveying unit (17) and an electrode cooling unit (18); The power supply unit (11) comprises a lower electrode (115), an upper electrode (113), a sintering upper punch (114) and a current generating device (111); The first support frame (13) is used for fixing the sintering pressure generating unit (12), the sintering vacuum unit (14) and the first lifting unit (15); The sintering unit (16) comprises a sintering platform (161), a floating mold module (162), a floating lower punch module (163), an upper guide column (164) and a lower guide column (165); The sintering platform (161) is fixedly installed with the upper guide column (164) and the lower guide column (165); The first lifting unit (15) pushes the floating lower punch module (163) to slide upward along the lower guide column (165) by lifting the lower electrode (115) provided by the power supply unit (11), and the floating lower punch module (163) contacts and pushes the floating mold module (162) and the sintering sample raw material (166) to slide upward along the upper guide column (164); The sintering pressure generating unit (12) comprises a sintering hydraulic cylinder (121) and a sintering piston rod (122); The sintering hydraulic cylinder (121) outputs a downward moving force to the sintering piston rod (122), the sintering piston rod (122) pushes the sintering upper punch (114) through the upper electrode (113) arranged on the power supply unit (11) to output pressure on the upper surface of the sintering sample raw material (166), the power supply unit (11) outputs the current generated by the current generating device (111) to the upper and lower surfaces of the sintering sample raw material (166) through the wire (112), the upper electrode (113) and the lower electrode (115), the sintering conveying unit (17) realizes the overall station switching of the sintering unit (16), and the electrode cooling unit (18) contacts and cools the sintering upper punch (114).

2. The inline flash sintering system of claim 1, wherein, The demolding and sampling module (2) comprises a demolding and sampling vacuum unit (22), a demolding pressure generating unit (24), a second jacking unit (25) and a second support frame (26); The demolding and sampling module (2) further comprises a sample collection and electrode cleaning unit (21), a demolding and sampling conveying unit (23) and a lifting mold frame (27); The second support frame (26) fixes the demolding pressure generating unit (24), the second jacking unit (25) and the demolding and sampling vacuum unit (22); The demolding and sampling vacuum unit (22) is provided with a demolding vacuum box (221) and a sampling vacuum box (222); The second jacking unit (25) is provided with a second screw rod elevator (251) and a mold jacking rod (252), and the second screw rod elevator (251) lifts the fixedly connected lifting mold frame (27) through the mold jacking rod (252); The lifting mold frame (27) is provided with a first mold platform (271) and a second mold platform (272), and the first mold platform (271) lifts the floating mold module (162) through the floating lower punch module (163) and slides along the upper guide column (164) and the extension guide column (229) fixed on the demolding vacuum box (221) to a set height through the first limiting groove (273) arranged; The sample collection and electrode cleaning unit (21) comprises a sample collection chute (211) and a cleaning sand belt (212), and the sample collection chute (211) and the cleaning sand belt (212) slide to below the floating mold module (162) through the second limiting groove (274) arranged on the first mold platform (271); The demolding pressure generating unit (24) comprises a demolding hydraulic cylinder (241), the demolding hydraulic cylinder (241) outputs a downward moving force to the demolding punch rod (242), the demolding punch rod (242) outputs pressure on the upper surface of the sintered sample product (167) through the demolding punch (243) fixedly connected thereto, and pushes the sintered sample product (167) to slide relative to the inner wall of the floating mold module (162) to complete demolding. The sample collection chute (211) receives the sintered sample product (167) after demolding, the cleaning sand belt (212) cleans the upper surface of the floating lower punch module (163) that slides along the lower guide column (165) lifted by the second mold base platform (272), and the cleaning brush (244) arranged between the demolding punch rod (242) and the demolding punch (243) synchronously completes the cleaning of the inner wall of the floating mold module (162); The sampling vacuum box (222) collects the sintered sample product (167) received by the sample collection chute (211); The demolding and sampling conveying unit (23) completes the overall station switching of the sintering unit (16).

3. The inline flash sintering system of claim 1, wherein, The first graphite paper automatic pressing and replacing module (3) comprises a graphite paper automatic pressing and replacing vacuum unit (33), a graphite paper automatic pressing and replacing conveying unit (34), a graphite paper automatic pressing pressure generating unit (37), a third support frame (38), and a third jacking unit (39); The first graphite paper automatic pressing and replacing module (3) further comprises a graphite paper winding working unit (31), a graphite paper winding standby unit (32), a graphite paper hollow punch unit (35), and a graphite paper replacing transmission guide rail (36); The third support frame (38) fixes the graphite paper automatic pressing and replacing vacuum unit (33), the graphite paper automatic pressing pressure generating unit (37), and the third jacking unit (39); The graphite paper automatic pressing and replacing vacuum unit (33) is provided with a graphite paper automatic pressing vacuum box (331) and a graphite paper automatic replacing vacuum box (332); The third jacking unit (39) is provided with a third screw rod lifter (391) and a graphite paper pressing support base (392), the third screw rod lifter (391) receives the power output by a servo motor and jacks up the floating lower punch module (163) and the floating mold module (162) contained in the sintering unit (16) through the graphite paper pressing support base (392), so that the floating lower punch module (163) and the floating mold module (162) are separated from the sintering platform (161); The graphite paper winding working unit (31) is provided with a graphite paper (311), a graphite paper recycling winding drum (312), a graphite paper storage winding drum (313), and a graphite paper winding drum driving motor (318), the graphite paper winding drum driving motor (318) fixed to the graphite paper automatic pressing vacuum box (331) through a motor support plate (319) drives the graphite paper recycling winding drum (312) to convey the new graphite paper (311) in the graphite paper storage winding drum (313) to the graphite paper hollow punch unit (35) and the sintering unit (16); The graphite paper hollow punch unit (35) is provided with a graphite paper push rod (351), a punch reset spring (352), and a hollow punch (353), and the two ends of the punch reset spring (352) are fixedly connected with the graphite paper push rod (351) and the hollow punch (353), respectively; The graphite paper hollow punch unit (35) is provided with a graphite paper push rod (351), a punch reset spring (352), and a hollow punch (353), and the two ends of the punch reset spring (352) are fixedly connected with the graphite paper push rod (351) and the hollow punch (353), respectively; The graphite paper automatic pressing and laying pressure generating unit (37) outputs pressing force to the graphite paper push rod (351), the graphite paper push rod (351) drives the graphite paper hollow punch unit (35) to move downward as a whole until the hollow punch (353) contacts the graphite paper (311) between the sintering unit (16), the punch return spring (352) transmits the pressing force output by the graphite paper push rod (351) to the hollow punch (353), the hollow punch (353) punches the graphite paper sheet of a fixed specification, and the graphite paper push rod (351) presses and lays the graphite paper sheet to a set depth in the floating die module (162); The graphite paper automatic pressing and laying and replacement conveying unit (34) completes the overall station switching of the sintering unit (16).

4. The inline flash sintering system of claim 1, wherein, The powder filling and pre-pressing module (4) comprises a powder filling and pre-pressing vacuum unit (44), a powder filling and pre-pressing pressure generating unit (46), a fourth support frame (47), and a fourth jacking unit (48); The powder filling and pre-pressing module (4) further comprises a pre-pressing unit (41), a powder filling unit (42), a vacuum storage unit (43), and a powder filling and pre-pressing conveying unit (45); The fourth support frame (47) fixes the powder filling and pre-pressing vacuum unit (44), the powder filling and pre-pressing pressure generating unit (46), and the fourth jacking unit (48); The fourth jacking unit (48) is provided with a fourth screw lifter (481) and a pre-pressing base (482), the fourth screw lifter (481) receives power output by a servo motor and jacks up the floating lower punch module (163) and the floating die module (162) contained in the sintering unit (16) through the pre-pressing base (482), so that the floating lower punch module (163) and the floating die module (162) are separated from the sintering platform (161); The pre-pressing unit (41) is provided with a green compact pressing rod (411), an auxiliary barrel (412), a barrel return spring (413), and an extension barrel (414), the upper and lower sides of the barrel return spring (413) are in contact with the green compact pressing rod (411) and the auxiliary barrel (412), respectively; The powder filling and pre-pressing pressure generating unit (46) is provided with a powder filling and pre-pressing servo hydraulic cylinder (461) and an extension pressing rod (462), the powder filling and pre-pressing servo hydraulic cylinder (461) outputs pressing force to the green compact pressing rod (411) through the extension pressing rod (462), the green compact pressing rod (411) drives the auxiliary barrel (412) and the extension barrel (414) to move downward through the barrel return spring (413) until the auxiliary barrel (412) is in close contact with the upper surface of the floating die module (162); The powder filling and pre-pressing pressure generating unit (46) is provided with a powder filling and pre-pressing servo hydraulic cylinder (461) and an extension pressing rod (462), the powder filling and pre-pressing servo hydraulic cylinder (461) outputs pressing force to the green compact pressing rod (411) through the extension pressing rod (462), the green compact pressing rod (411) drives the auxiliary barrel (412) and the extension barrel (414) to move downward through the barrel return spring (413) until the auxiliary barrel (412) is in close contact with the upper surface of the floating die module (162); The powder loading unit (42) is provided with an in-box storage cylinder (421) and a quantitative feeding valve (422), the vacuum storage unit (43) is provided with a vacuum storage bin (431) and a vacuum feeding valve (432), the in-box storage cylinder (421) fixed on the powder loading and pre-pressing vacuum unit (44) by an in-box storage cylinder support column (423) receives the powder stored in the vacuum storage bin (431) through the opening of the vacuum feeding valve (432), the quantitative feeding valve (422) quantitatively feeds the powder into the floating mold module (162) mold and the auxiliary cylinder (412) through the extension of the powder pipe (414), and the powder is pressed and laid on the graphite paper pressed by the first graphite paper automatic pressing and replacing module (3). The green compact pressing rod (411) transmits the pressing force of the powder loading and pre-pressing servo hydraulic cylinder (461) to the upper surface of the powder, and completes the pressing of the green compact. The driving slider (173) drives the sintering unit (16) to realize overall station switching along the powder loading and pre-pressing conveying unit (45).

5. The inline flash sintering system of claim 1, wherein, The sintering vacuum unit (14) comprises a sintering vacuum box body (141) and a first vacuum box support (145); The sintering vacuum box body (141) is connected with the vacuum switching module (6) through the first vacuum plug valve (142) fixed on both sides to provide a vacuum environment for the sintering module (1), and the sintering vacuum box body (141) is provided with a sliding sealing ring (143) between the upper electrode (113) and the lower electrode (115); The sintering vacuum box body (141) is further provided with a sintering vacuum box door (144) for maintenance on the outside; and the first vacuum box support (145) fixes the sintering vacuum box body (141) on the first support frame (13).

6. The inline flash sintering system of claim 2, wherein, The graphite paper automatic pressing and replacing vacuum unit (33) is further provided with a graphite paper replacing vacuum plug valve (335), a third vacuum plug valve (336) and a third vacuum box support (337), the third vacuum plug valve (336) is fixedly arranged on both sides of the graphite paper automatic pressing vacuum box (331) and connected with the vacuum switching module (6) to provide a vacuum environment for the first graphite paper automatic pressing and replacing module (3); The graphite paper replacing vacuum plug valve (335) is fixedly arranged between the graphite paper automatic pressing vacuum box (331) and the graphite paper automatic replacing vacuum box (332) to isolate the graphite paper automatic pressing vacuum box (331) and the graphite paper automatic replacing vacuum box (332); The third vacuum box support (337) fixes the graphite paper automatic pressing vacuum box (331) and the graphite paper automatic replacing vacuum box (332) on the third support frame (38); The graphite paper automatic pressing vacuum box (331) is provided with a graphite paper automatic pressing vacuum box door (333) for maintenance on the outside, and the graphite paper automatic replacing vacuum box (332) is provided with a graphite paper automatic replacing vacuum box door (334) of the old graphite paper roll collecting working unit (31) for replacing and storing old graphite paper.

7. The inline flash sintering system of claim 4, wherein, The powder loading and pre-pressing vacuum unit (44) is provided with a powder loading and pre-pressing vacuum box (441), a material receiving sealing flange (443), a fourth vacuum plug valve (444) and a fourth vacuum box support (445), the fourth vacuum plug valve (444) is fixedly arranged on both sides of the powder loading and pre-pressing vacuum box (441) and connected with the vacuum switching module (6) to provide a vacuum environment for the powder loading and pre-pressing module (4); The fourth vacuum box support (445) fixes the powder loading and pre-pressing vacuum box (441) on the fourth support frame (47); The material receiving sealing flange (443) seals and installs the vacuum storage unit (43) on the powder loading and pre-pressing vacuum box (441); The powder loading and pre-pressing vacuum box (441) is provided with a powder loading and pre-pressing vacuum box door (442) outside for maintenance.

8. The inline flash sintering system of claim 2, wherein, The demolding and sampling vacuum unit (22) is further provided with a second vacuum plug valve (223), a sampling vacuum plug valve (224), a second vacuum box support (225) and a support plate (228), the second vacuum plug valve (223) is fixedly arranged on both sides of the demolding vacuum box (221) and connected with the vacuum switching module (6) to provide a vacuum environment for the demolding and sampling module (2); The sampling vacuum plug valve (224) is fixedly arranged between the demolding vacuum box (221) and the sampling vacuum box (222) to isolate the demolding vacuum box (221) and the sampling vacuum box (222); The second vacuum box support (225) fixes the demolding vacuum box (221) on the second support frame (26), and the support plate (228) fixes the extension guide column (229) on the demolding vacuum box (221); The demolding vacuum box (221) is provided with a demolding vacuum box door (226) outside for maintenance, and the sampling vacuum box (222) is provided with a sampling vacuum box door (227) for collecting sintered sample finished products (167).

9. A flow-line flash sintering method using the flow-line flash sintering system according to any one of claims 1 to 8, characterized by, The method comprises the following steps: S1, vacuum acquisition: open the vacuum plug valves of each module, connect the modules, and then draw the system to the target vacuum degree through the vacuum pump; S2, press the first layer of graphite paper: the cleaned sintering unit (16) moves to the first graphite paper automatic pressing and replacing module (3), the mold group is jacked up, the first layer of graphite paper is punched and pressed to the bottom of the mold; S3, powder loading and pre-pressing: the sintering unit (16) with the first layer of graphite paper is moved to the powder loading and pre-pressing module (4), the mold group is jacked up, the powder is quantitatively added and pre-pressed to form a green body; S4, press the second layer of graphite paper: the sintering unit (16) with the green body is moved to the second graphite paper automatic pressing and replacing module (5), the mold group is jacked up, the second layer of graphite paper is punched and pressed above the green body; S5, sintering: the sintering unit (16) with the green body and the two layers of graphite paper is moved to the sintering module (1), the mold group is jacked up to float, the pressure and current are applied for flash sintering to form sintered finished products; S6, demolding and sampling: the sintering unit (16) with the sintered finished products is moved to the demolding and sampling module (2), the mold group is jacked up to the demolding station, the sintered finished products are ejected, the mold and punch are cleaned synchronously, and the sintered finished products are collected.

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