Continuous high-temperature vacuum sintering furnace

Abstract

The invention relates to a continuous high-temperature vacuum sintering furnace. A low-temperature cavity communicates with a high-temperature preheating cavity through a second gate plate, the high-temperature preheating cavity communicates with a heating cavity, the heating cavity communicates with a slow cooling cavity, the slow cooling cavity communicates with a cooling cavity, the cooling cavity communicates with a push-out cavity, and the push-out cavity communicates with a discharging cavity through a third gate plate. The discharging end of the discharging cavity communicates with one end of an outer circulation material channel through a fourth gate plate, the other end of the outer circulation material channel communicates with the feeding end of a feeding bin, and a first pusher, a second pusher, a third pusher and a fourth pusher are arranged on the outer side of the feeding bin, the outer side of the low-temperature cavity, the outer side of the push-out cavity and the outer side of the discharging cavity correspondingly. The feeding cavity, the push-out cavity and the discharging cavity are provided with a first air exhaust valve assembly, a second air exhaust valve assembly and a third air exhaust valve assembly correspondingly. The energy consumption is saved, the expected effect of the vacuum state is ensured, and the sintering efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sintering furnaces, and in particular to a continuous high-temperature vacuum sintering furnace. Background Art

[0002] Sintering furnace refers to a special equipment that enables powder compacts to obtain the required physical, mechanical properties and microstructure through sintering. At present, traditional sintering furnaces are divided into continuous sintering furnaces, intermittent sintering furnaces, vacuum sintering furnaces, low-pressure sintering furnaces, continuous vacuum sintering furnaces, etc. Among them, the continuous vacuum sintering furnace can realize continuous production and transfer operations without stopping during the production process. It is connected through multiple cavities, and gates are set to implement independent sealing and isolation between different cavities. During the combustion process, it can control the independent heating chamber to implement the sintering operation after the vacuum operation, so it can avoid repeated opening of the furnace door after each sintering is completed, and realize the efficient use of thermal energy.

[0003] However, the traditional continuous vacuum sintering furnace has some defects during use: First, its transmission method is to use multiple production and delivery cavities and transmission mechanisms in the heating cavity to implement the material transfer operation, which requires the transmission mechanism to be resistant to high temperatures, which increases the cost. At the same time, the transmission parts of the transfer operation between different cavities are complex to connect, and the bottom of the transmission mechanism will inevitably leak during the transportation process. The seal is not tight, etc., resulting in increased energy consumption and the expected effect of the vacuum state cannot be guaranteed. Secondly, the traditional continuous vacuum sintering furnace is equipped with an independent heating cavity, but its separate heating cavity will have defects such as slow heating and cooling speed and low equipment efficiency during use. At the same time, its circulation turnover production capacity is weak. Although there are some multi-cavity continuous vacuum sintering furnaces on the market, their overall functions are relatively simple, and the heat loss is large during the overall vacuum operation.

[0004] Therefore, the present invention provides a continuous high-temperature vacuum sintering furnace, which can realize high-temperature vacuum continuous production operations, does not remove the traditional chain mechanism, achieves high sealing, and cooperates with the control of different gates and independent cavities to achieve efficient utilization of thermal energy. At the same time, it can accelerate the heating process in the vacuum sintering process, efficiently utilize waste heat, and achieve rapid cooling. At the same time, it can be used as a gas-protected sintering furnace. The overall functions are diverse and the scope of use is wide. Summary of the invention

[0005] In view of the defects of the prior art, the present invention provides a continuous high-temperature vacuum sintering furnace with simple structure, high working and operating efficiency, energy saving and environmental protection, high continuous production efficiency, high thermal energy utilization rate, low heat loss, good sealing, diverse functions and wide range of use, which is used to overcome the defects in the prior art.

[0006] The technical solution of the present invention is achieved as follows: a continuous high-temperature vacuum sintering furnace comprises a feed bin, a heating chamber connected to the feed bin, and a discharging chamber connected to the heating chamber, the discharging end of the feed bin is connected to the feed chamber through a first gate plate, the end of the feed chamber is connected to the low-temperature chamber, the low-temperature chamber is connected to the high-temperature preheating chamber through a second gate plate, the high-temperature preheating chamber is connected to the heating chamber, the heating chamber is connected to the slow cooling chamber, the slow cooling chamber is connected to the cooling chamber, the cooling chamber is connected to the ejection chamber, the ejection chamber is connected to the discharging chamber through a third gate plate, the discharging end of the discharging chamber is connected to one end of an external circulation channel through a fourth gate plate, the other end of the external circulation channel is connected to the feeding end of the feed bin, the outsides of the feed bin, the low-temperature chamber, the ejection chamber and the discharging chamber are respectively provided with a first pusher, a second pusher, a third pusher and a fourth pusher, and the feed chamber, the ejection chamber and the discharging chamber are respectively provided with a first air exhaust valve assembly, a second air exhaust valve assembly and a third air exhaust valve assembly.

[0007] Furthermore, a sintering chamber is provided in the heating cavity, and a graphite heating tube is installed in the sintering chamber through a graphite disc support. The outer wall of the graphite heating tube is wrapped with at least one layer of insulation layer, and an electromagnetic induction heating coil is mounted on the outer side of the insulation layer.

[0008] Furthermore, a pushing support platform matched with the first pusher is provided in the feed bin, a feeding support platform connected with the pushing support platform is provided in the feed cavity, a low-temperature zone support platform matched with the feeding support platform and the second pusher is provided in the low-temperature cavity, a high-temperature preheating zone support platform matched with the low-temperature zone support platform is provided in the high-temperature preheating cavity, the high-temperature preheating zone support platform matches with the feeding end of the heating cavity, the discharging end of the heating cavity matches with the slow cooling support platform installed in the slow cooling cavity, the slow cooling support platform is connected with the cooling zone support platform installed in the cooling cavity, the cooling zone support platform is connected with the discharging support platform installed in the discharging cavity, the discharging support platform is connected with the discharging support platform installed in the discharging cavity, the discharging support platform is connected with one end of the external circulation material channel, and the other end of the external circulation material channel is connected with the pushing support platform.

[0009] Furthermore, the external circulation material channel and the feed bin, feed chamber, low-temperature chamber, high-temperature preheating chamber, heating chamber, slow cooling chamber, cooling chamber, ejection chamber and discharge chamber are in a square structure connected end to end, with the output direction of the first pusher toward the low-temperature chamber, the output direction of the second pusher toward the ejection chamber, the output direction of the third pusher toward the discharge chamber, and the output direction of the fourth pusher toward the feed bin.

[0010] Furthermore, the central axes of the feed chamber and the discharge chamber are parallel to each other, and the central axes of the low-temperature chamber, the high-temperature preheating chamber, the heating chamber, the slow cooling chamber, the cooling chamber and the ejection chamber are on the same straight line.

[0011] Furthermore, the setting direction of the first pusher output end is perpendicular to the setting direction of the second pusher output end, the setting direction of the second pusher output end is perpendicular to the setting direction of the third pusher output end, the setting direction of the third pusher output end is perpendicular to the setting direction of the fourth pusher output end, and the setting direction of the fourth pusher output end is perpendicular to the setting direction of the first pusher output end.

[0012] Furthermore, an exhaust valve assembly is provided on the high-temperature preheating chamber, the inner end of the exhaust valve assembly is connected to the inner side of the high-temperature preheating chamber, an exhaust control valve and an exhaust pipe are installed on the exhaust valve assembly, the inner ends of the first air exhaust valve assembly, the second air exhaust valve assembly and the third air exhaust valve assembly are respectively connected to the inner cavities of the feed chamber, the push chamber and the discharge chamber, and the first air exhaust valve assembly, the second air exhaust valve assembly and the third air exhaust valve assembly are all installed with an exhaust control valve and an exhaust pipe.

[0013] Furthermore, a sintering support platform is provided in the heating chamber, one end of the sintering support platform is connected to the output end of the high-temperature preheating zone support platform, and the other end of the sintering support platform is connected to the input end of the slow cooling support platform. The bottom sealing lifting plate of the first gate plate is arranged between the pushing support platform and the feeding support platform, the bottom sealing lifting plate of the second gate plate is arranged between the low-temperature zone support platform and the high-temperature preheating zone support platform, the bottom sealing lifting plate of the third gate plate is arranged between the pushing support platform and the discharging support platform, and the bottom sealing lifting plate of the fourth gate plate is arranged between the discharging support platform and the external circulation material channel.

[0014] Furthermore, a graphite sagger is arranged on the top of the sintering support platform, and the length of the sintering support platform is a multiple of the length of the graphite sagger. Several graphite saggers are arranged on the pushing support platform, the feeding support platform, the low-temperature zone support platform, the high-temperature preheating zone support platform, the slow cooling support platform, the cooling zone support platform, the pushing support platform, the discharging support platform and the external circulation material channel, and the length of the high-temperature preheating zone support platform is a multiple of the length of the graphite sagger.

[0015] The present invention has the following positive effects:

[0016] Firstly, the present invention adopts four externally arranged pushers to implement continuous material pushing operation to allow the material to enter from one end of the outer circulation channel and finally be sent out from the other end of the outer circulation channel after four transfer operations. Support platforms with the same top height are arranged in multiple independent chambers. The graphite sagger can implement translation and transfer operations under external force pushing operation on the same horizontal plane. The four pushers interact with each other. Except for the first pusher, the other pushers are all sealed and leak-proof structures, and the output ends are connected with their respective matching chambers. The output ends of the second pusher, the third pusher and the fourth pusher are all mounted in the sealing sleeves arranged on their respective matching chambers to ensure that there is no leakage during the vacuum operation. Compared with the traditional equipment, the chain transmission structure is removed, the stability during operation is ensured, and the bottom leakage during continuous chain conveying operation is avoided, which saves energy consumption, ensures the expected effect of the vacuum state, and improves the sintering efficiency.

[0017] Secondly, the present invention implements continuous high-temperature vacuum sintering of materials by cooperating with a feed bin, a feed chamber, a low-temperature chamber, a high-temperature preheating chamber, a heating chamber, a slow cooling chamber, a cooling chamber, a push-out chamber, a discharging chamber and an external circulation material channel. Each cavity is relatively independent and interconnected. The cavity sealing, opening and closing, and vacuuming operations during the high-temperature vacuum roasting operation are realized in the form of four gate plates and three exhaust valve assemblies, which improves the overall operation efficiency, and can realize continuous high-temperature vacuum sintering operations without stopping the machine, and can realize independent vacuuming operations of the high-temperature preheating chamber, the heating chamber, the slow cooling chamber, the cooling chamber and the push-out chamber. At the same time, the feed chamber and the low-temperature chamber are used as an independent vacuuming area, and the discharging chamber is used as an independent vacuuming cavity. The overall vacuuming of the low-temperature zone after feeding, the independent vacuuming operations of high-temperature preheating, sintering, slow cooling and cooling, and the independent vacuuming operations after discharging are realized. Each cavity and its associated area can realize independent vacuuming control, which improves the utilization efficiency of thermal energy and avoids the occurrence of air leakage.

[0018] Thirdly, in addition to the advantages of strong continuous production capacity, low energy consumption, strong sealing, energy saving and environmental protection, the independent structural design of the present invention also has the advantage of one furnace for multiple uses. The present invention is provided with an exhaust valve assembly, which can implement efficient vacuuming through the exhaust pipe after the exhaust control valve is opened during the continuous high-temperature vacuum sintering operation. At the same time, the present invention can be used as a gas-protected sintering furnace. When the first gas exhaust valve assembly, the second exhaust valve assembly and the third exhaust valve assembly are changed to a nitrogen inlet, when the exhaust valve assembly is opened, the exhaust valve assembly connected to the high-temperature preheating chamber is opened to implement the exhaust operation, and the present invention has the function of a gas-protected sintering furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the top structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the internal top view structure of the present invention.

[0021] Figure 3 This is one of the schematic diagrams of the internal structure of the heating chamber of the present invention.

[0022] Figure 4 This is the second schematic diagram of the internal structure of the heating chamber of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the following description of the invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. The term "connection" only indicates the connection between devices and has no special meaning.

[0025] like Figure 1 , 2As shown in , 3 and 4, a continuous high-temperature vacuum sintering furnace comprises a feed bin 2, a heating chamber 11 connected to the feed bin 2, and a discharge chamber 18 connected to the heating chamber 11, the discharge end of the feed bin 2 is connected to the feed chamber 5 through a first gate plate 4, the end of the feed chamber 5 is connected to a low-temperature chamber 8, the low-temperature chamber 8 is connected to a high-temperature preheating chamber 9 through a second gate plate 41, the high-temperature preheating chamber 9 is connected to the heating chamber 11, the heating chamber 11 is connected to a slow cooling chamber 12, the slow cooling chamber 12 is connected to a cooling chamber 13, the cooling chamber 13 is connected to a push-out chamber 16, and the push-out chamber 16 The discharge chamber 18 is connected through the third gate plate 17, and the discharge end of the discharge chamber 18 is connected to one end of the outer circulation channel 1 through the fourth gate plate 21, and the other end of the outer circulation channel 1 is connected to the feed end of the feed bin 2. The outsides of the feed bin 2, the low-temperature chamber 8, the push-out chamber 16 and the discharge chamber 18 are respectively provided with the first pusher 3, the second pusher 7, the third pusher 15 and the fourth pusher 20, and the feed chamber 5, the push-out chamber 16 and the discharge chamber 18 are respectively provided with the first air extraction valve assembly 6, the second air extraction valve assembly 14 and the third air extraction valve assembly 19. The heating chamber 11 is provided with a sintering chamber, and a graphite heating tube 22 is supported and installed in the sintering chamber by a graphite disc 25. The outer wall of the graphite heating tube 22 is wrapped with at least one layer of thermal insulation layer 23, and an electromagnetic induction heating coil 24 is set on the outer side of the thermal insulation layer 23. The feed bin 2 is provided with a push-in support platform 28 matched with the first pusher 3, the feed chamber 5 is provided with a feed support platform 29 connected with the push support platform 28, the low-temperature chamber 8 is provided with a low-temperature zone support platform 30 matched with the feed support platform 29 and the second pusher 7, the high-temperature preheating chamber 9 is provided with a high-temperature preheating zone support platform 31 matched with the low-temperature zone support platform 30, the high-temperature preheating zone support platform 31 is matched with the feed end of the heating chamber 11, and the heating chamber 11 is provided with a feed end of the heating chamber 11. The material end cooperates with the slow cooling support platform 32 installed in the slow cooling chamber 12, the slow cooling support platform 32 is connected with the cooling zone support platform 33 installed in the cooling chamber 13, the cooling zone support platform 33 is connected with the pushing out support platform 34 installed in the pushing out chamber 16, the pushing out support platform 34 is connected with the discharging support platform 35 installed in the discharging chamber 18, the discharging support platform 35 is connected with one end of the external circulation material channel 1, and the other end of the external circulation material channel 1 is connected with the pushing support platform 28.

[0026] During specific use, the feed bin 2 is an open structure, and its inner cavity is connected to the external gas. The feed chamber 5 and the low-temperature chamber 8 between the first gate plate 4 and the second gate plate 41 are interconnected and can realize gas vacuum operation. The vacuum operation is achieved through the first gas exhaust valve assembly. The high-temperature preheating chamber 9, the heating chamber 11, the slow cooling chamber 12, the cooling chamber 13 and the ejection chamber 16 between the second gate plate 41 and the third gate plate 17 are independent and interconnected areas, and the vacuum operation of this area is achieved through the second exhaust valve assembly. The discharge chamber 18 between the third gate plate 17 and the fourth gate plate 21 is a separate and independent cavity, and the vacuum operation is achieved through the third exhaust valve assembly. The second gate plate 41 and the third gate plate 17 arranged on both sides of the heating chamber 11 ensure that the high-temperature preheating chamber 9, the heating chamber 11, the slow cooling chamber 12, the cooling chamber 13 and the ejection chamber 16 can achieve a vacuum state during the high-temperature sintering process. At the same time, when the feeding operation is running, the external material is fed in through the feed bin 2 and can enter the feed chamber 5 only after the first gate plate 4 is opened. After a batch of materials is loaded, the first gate plate 4 is closed and then the first air exhaust valve assembly 6 is used to evacuate the material in the low-temperature chamber 8 when it enters the high-temperature preheating chamber 9. The cavity bodies on both sides of the second gate plate 41 are in a vacuum state. Similarly, when the discharging operation is running, when the third gate plate 17 is opened, the cavities on both sides thereof are also in a vacuum state. Through this structural setting, a continuous vacuum state is achieved during the feeding, high-temperature sintering and discharging processes, and the effect of continuous high-temperature vacuum roasting is achieved.

[0027] The outer circulation channel 1 is in a square structure connected end to end with the feed bin 2, feed cavity 5, low temperature cavity 8, high temperature preheating cavity 9, heating cavity 11, slow cooling cavity 12, cooling cavity 13, ejection cavity 16 and discharge cavity 18. The output direction of the first pusher 3 is toward the low temperature cavity 8, the output direction of the second pusher 7 is toward the ejection cavity 16, the output direction of the third pusher 15 is toward the discharge cavity 18, and the output direction of the fourth pusher 20 is toward the feed bin 2. The central axes of the feed cavity 5 and the discharge cavity 18 are parallel to each other, and the central axes of the low temperature cavity 8, high temperature preheating cavity 9, heating cavity 11, slow cooling cavity 12, cooling cavity 13 and ejection cavity 16 are in the same straight line. The setting direction of the output end of the first pusher 3 is perpendicular to the setting direction of the output end of the second pusher 7, the setting direction of the output end of the second pusher 7 is perpendicular to the setting direction of the output end of the third pusher 15, the setting direction of the output end of the third pusher 15 is perpendicular to the setting direction of the output end of the fourth pusher 20, and the setting direction of the output end of the fourth pusher 20 is perpendicular to the setting direction of the output end of the first pusher 3.

[0028] During specific use, the first pusher 3, the second pusher 7, the third pusher 15 and the fourth pusher 20 cooperate with each other. This product implements a square structure with end-to-end connected feeding and discharging methods to implement cyclic feeding and discharging operations. The outer circulation material channel 1 and the feed bin 2 are open structures, and the other cavities are sealed structures. Four gates are used to achieve sealing and opening operations. The directions of the output ends of the four pushers are different, which can achieve continuous advancement of the materials in four directions after entering, and finally realize the cyclic discharging operation. In addition, except for the first pusher 3, sealing measures are taken between the other three pushers and their adjacent cavities to ensure the airtightness of the three pushers during the extension and retraction process to avoid air leakage in the cavity.

[0029] A sintering support platform 26 is arranged in the heating chamber 11, one end of the sintering support platform 26 is connected to the output end of the high-temperature preheating zone support platform 31, and the other end of the sintering support platform 26 is connected to the input end of the slow cooling support platform 32, the bottom sealing lifting plate of the first gate plate 4 is arranged between the pushing support platform 28 and the feeding support platform 29, the bottom sealing lifting plate of the second gate plate 41 is arranged between the low-temperature zone support platform 30 and the high-temperature preheating zone support platform 31, the bottom sealing lifting plate of the third gate plate 17 is arranged between the pushing support platform 34 and the discharging support platform 35, and the bottom sealing lifting plate of the fourth gate plate 21 is arranged between the discharging support platform 35 and the external circulation material channel 1. A graphite sagger 27 is arranged on the top of the sintering support platform 26, and the length of the sintering support platform 26 is a multiple of the length of the graphite sagger 27. Several graphite saggers 27 are arranged on the pushing support platform 28, the feeding support platform 29, the low temperature zone support platform 30, the high temperature preheating zone support platform 31, the slow cooling support platform 32, the cooling zone support platform 33, the pushing support platform 34, the discharging support platform 35 and the outer circulation material channel 1, and the length of the high temperature preheating zone support platform 31 is a multiple of the length of the graphite sagger 27.

[0030] The high-temperature preheating chamber 9 is provided with an exhaust valve assembly 10, the inner end of the exhaust valve assembly 10 is connected to the inner side of the high-temperature preheating chamber 9, and an exhaust control valve and an exhaust pipe are installed on the exhaust valve assembly 10. The inner ends of the first air exhaust valve assembly 6, the second air exhaust valve assembly 14 and the third air exhaust valve assembly 19 are respectively connected to the inner cavities of the feed chamber 5, the ejection chamber 16 and the discharge chamber 18, and the first air exhaust valve assembly 6, the second air exhaust valve assembly 14 and the third air exhaust valve assembly 19 are all installed with exhaust control valves and exhaust pipes.

[0031] During specific use, in order to ensure the consistency and flatness of the material during the pushing process, and ultimately achieve the efficiency of material feeding and discharging, the present invention adopts a design in which the top height of all the supporting platforms is consistent. Some supporting platforms are made of high-temperature resistant materials, which are mainly concentrated in the feeding and discharging areas, low temperatures, and ring cooling and cooling cavities. Some supporting platforms are made of high-temperature materials, which are mainly arranged in high-temperature preheating and heating cavities. The overall high-temperature resistant materials are used less, which saves costs and can realize continuous high-temperature vacuum sintering operations. The independently set low-temperature, high-temperature preheating, heating, slow cooling and cooling cavities cooperate with the gate opening method, which changes the disadvantages of slow heating of the traditional furnace body and large heat loss, greatly saves the use efficiency of the equipment, solves the pollution effect of carbon ink on the environment, and protects the health of the staff.

[0032] Example: Figure 1-4 As shown, during operation, the material is loaded into the graphite sagger 27, and the material is first pushed into the feed chamber 5 by the first pusher 3 arranged on the outside of the feed bin 2. At this time, the first gate 4 and the second gate 41 are both in the open state. In the initial state, a preset number of graphite saggers 27 are pushed in, and in the later operation process, a graphite sagger 27 is pushed in every half hour.

[0033] The first batch of graphite saggers 27 enter the feeding chamber 5 one by one. When the position of the first graphite sagger 27 in the initial state falls into the center of the low-temperature chamber 8, the first graphite sagger 27 in the initial state is pushed into the high-temperature preheating chamber 9 by the second pusher 7. With the continuous operation of the first pusher 3 and the second pusher 7, the first graphite sagger 27 in the initial state is gradually pushed into the heating chamber 11. At this time, the first gate 4 and the second gate 41 are closed, and the first air extraction valve assembly 6 and the second air extraction valve assembly 14 are opened to control the feeding chamber 5, the low-temperature chamber 8, and the high-temperature preheating chamber 9. The hot chamber 9, the heating chamber 11, the slow cooling chamber 12, the cooling chamber 13 and the pushing chamber 16 are evacuated, and the electromagnetic induction heating coil 24 is turned on to sinter the material in the graphite heating tube 22. After the preset sintering time is reached, the first gate 4 is opened, and a new graphite sagger 27 is pushed in through the first pusher 3. The graphite sagger 27 initially stagnated at the outer end of the feeding chamber 5 pushes the material to the action position of the second pusher 7 in the low-temperature chamber 8, the first gate 4 is closed to evacuate, and then the second gate 41 is opened to push the new graphite sagger 27 into the low-temperature chamber 8 through the second pusher 7. A graphite sagger 27 falling into the low temperature chamber 8 is pushed into the high temperature preheating chamber 9, and then the second gate 41 is closed. The first graphite sagger 27 after sintering in the initial state is ejected from the heating chamber 11 and falls into the slow cooling chamber 12, and the cycle is repeated in sequence until the first graphite sagger 27 in the initial state falls into the pushing chamber 16 after passing through the cooling chamber 13. At this time, the third gate 17 and the fourth gate 21 are closed, and then the third exhaust valve assembly 19 is opened to perform vacuum operation on the discharge chamber 18. After the vacuum operation is completed, the third gate 17 is opened, and the fourth gate 21 is closed and in a closed state. state, the first graphite sagger 27 in the initial state is pushed into the discharge chamber 18 by the third pusher 15, and with the subsequent successive transfer and movement of the graphite saggers 27, the discharge chamber 18 is gradually filled with multiple graphite saggers 27. When the position of the first graphite sagger 27 in the initial state falls into the working surface position of the fourth pusher 20, the fourth gate 21 is opened. At this time, the third gate 17 is in the closed state, and the first graphite sagger 27 in the initial state is pushed out to the external circulation channel 1 by the fourth pusher 20, completing the continuous high-temperature vacuum sintering operation of circulating feeding and discharging.

[0034] As another embodiment of the present invention, during operation, the first air exhaust valve assembly 6, the second air exhaust valve assembly 14 and the third air exhaust valve assembly 19 are used as nitrogen filling ports. When the sintering operation is running, the exhaust control valve and the exhaust pipe on the exhaust valve assembly 10 are opened, and the continuous high-temperature vacuum sintering furnace side is used as a gas protection sintering furnace.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous high-temperature vacuum sintering furnace, comprising a feed bin (2), a heating chamber (11) connected to the feed bin (2), and a discharge chamber (18) connected to the heating chamber (11), characterized in that: The discharge end of the feed bin (2) is connected to the feed chamber (5) through the first gate plate (4), the end of the feed chamber (5) is connected to the low temperature chamber (8), the low temperature chamber (8) is connected to the high temperature preheating chamber (9) through the second gate plate (41), the high temperature preheating chamber (9) is connected to the heating chamber (11), the heating chamber (11) is connected to the slow cooling chamber (12), the slow cooling chamber (12) is connected to the cooling chamber (13), the cooling chamber (13) is connected to the ejection chamber (16), the ejection chamber (16) is connected to the discharge chamber (18) through the third gate plate (17), and the discharge of the discharge chamber (18) The first end of the external circulation channel (1) is connected to one end of the external circulation channel (1) through a fourth gate plate (21), and the other end of the external circulation channel (1) is connected to the feed end of the feed bin (2). The outsides of the feed bin (2), the low-temperature chamber (8), the push-out chamber (16) and the discharge chamber (18) are respectively provided with a first pusher (3), a second pusher (7), a third pusher (15) and a fourth pusher (20). The feed chamber (5), the push-out chamber (16) and the discharge chamber (18) are respectively provided with a first air extraction valve assembly (6), a second air extraction valve assembly (14) and a third air extraction valve assembly (19).

2. The continuous high temperature vacuum sintering furnace according to claim 1, characterized in that: A sintering chamber is arranged in the heating chamber (11), and a graphite heating tube (22) is installed in the sintering chamber through the support of a graphite disc (25). The outer wall of the graphite heating tube (22) is wrapped with at least one layer of insulation layer (23), and an electromagnetic induction heating coil (24) is mounted on the outer side of the insulation layer (23).

3. The continuous high temperature vacuum sintering furnace according to claim 1, characterized in that: The feed bin (2) is provided with a push-in support platform (28) matched with the first pusher (3); the feed chamber (5) is provided with a feed support platform (29) connected with the pusher support platform (28); the low-temperature chamber (8) is provided with a low-temperature zone support platform (30) matched with the feed support platform (29) and the second pusher (7); the high-temperature preheating chamber (9) is provided with a high-temperature preheating zone support platform (31) matched with the low-temperature zone support platform (30); the high-temperature preheating zone support platform (31) is matched with the feed end of the heating chamber (11); the heating chamber (11) The discharge end cooperates with a slow cooling support platform (32) installed in the slow cooling chamber (12), the slow cooling support platform (32) is connected to a cooling zone support platform (33) installed in the cooling chamber (13), the cooling zone support platform (33) is connected to a push-out support platform (34) installed in the push-out chamber (16), the push-out support platform (34) is connected to a discharge support platform (35) installed in the discharge chamber (18), the discharge support platform (35) is connected to one end of the external circulation channel (1), and the other end of the external circulation channel (1) is connected to the push-in support platform (28).

4. The continuous high temperature vacuum sintering furnace according to claim 1, characterized in that: The outer circulation channel (1) and the feed bin (2), the feed chamber (5), the low-temperature chamber (8), the high-temperature preheating chamber (9), the heating chamber (11), the slow cooling chamber (12), the cooling chamber (13), the ejection chamber (16) and the discharge chamber (18) are in a square structure connected end to end. The output direction of the first pusher (3) is toward the low-temperature chamber (8), the output direction of the second pusher (7) is toward the ejection chamber (16), the output direction of the third pusher (15) is toward the discharge chamber (18), and the output direction of the fourth pusher (20) is toward the feed bin (2).

5. The continuous high temperature vacuum sintering furnace according to claim 1, characterized in that: The central axes of the feed chamber (5) and the discharge chamber (18) are parallel to each other, and the central axes of the low-temperature chamber (8), the high-temperature preheating chamber (9), the heating chamber (11), the slow cooling chamber (12), the cooling chamber (13) and the ejection chamber (16) are on the same straight line.

6. The continuous high temperature vacuum sintering furnace according to claim 1, characterized in that: The setting direction of the output end of the first pusher (3) is perpendicular to the setting direction of the output end of the second pusher (7), the setting direction of the output end of the second pusher (7) is perpendicular to the setting direction of the output end of the third pusher (15), the setting direction of the output end of the third pusher (15) is perpendicular to the setting direction of the output end of the fourth pusher (20), and the setting direction of the output end of the fourth pusher (20) is perpendicular to the setting direction of the output end of the first pusher (3).

7. The continuous high temperature vacuum sintering furnace according to claim 1, characterized in that: The high-temperature preheating chamber (9) is provided with an exhaust valve assembly (10), the inner end of the exhaust valve assembly (10) is connected to the inner side of the high-temperature preheating chamber (9), and an exhaust control valve and an exhaust pipe are installed on the exhaust valve assembly (10).

8. The continuous high temperature vacuum sintering furnace according to claim 3, characterized in that: A sintering support platform (26) is arranged in the heating chamber (11), one end of the sintering support platform (26) is connected to the output end of the high-temperature preheating zone support platform (31), and the other end of the sintering support platform (26) is connected to the input end of the slow cooling support platform (32). The bottom sealing lifting plate of the first gate plate (4) is arranged between the pushing support platform (28) and the feeding support platform (29), the bottom sealing lifting plate of the second gate plate (41) is arranged between the low-temperature zone support platform (30) and the high-temperature preheating zone support platform (31), the bottom sealing lifting plate of the third gate plate (17) is arranged between the pushing support platform (34) and the discharging support platform (35), and the bottom sealing lifting plate of the fourth gate plate (21) is arranged between the discharging support platform (35) and the external circulation channel (1).

9. The continuous high temperature vacuum sintering furnace according to claim 8, characterized in that: A graphite sagger (27) is arranged on the top of the sintering support platform (26), and the length of the sintering support platform (26) is a multiple of the length of the graphite sagger (27). A plurality of graphite saggers (27) are arranged on the pushing support platform (28), the feeding support platform (29), the low temperature zone support platform (30), the high temperature preheating zone support platform (31), the slow cooling support platform (32), the cooling zone support platform (33), the pushing support platform (34), the discharging support platform (35) and the outer circulation material channel (1), and the length of the high temperature preheating zone support platform (31) is a multiple of the length of the graphite sagger (27).

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