Suspension connecting device for sintering loose media

Abstract

The invention provides a suspension connecting device for loose body sintering, and relates to the technical field of ultralow hydroxyl glass preparation, the device comprises a quartz isolation hood, a furnace core tube, a quartz guide rod, a suspension head and a graphite bolt body, the quartz guide rod is internally provided with an air passage, the suspension head is internally provided with a mounting cavity communicated with the suspension head, and the graphite bolt body is internally provided with an air outlet; the side wall of the quartz guide rod is provided with a through hole for gas seepage, the upper end of the quartz guide rod is rotatably connected with a sealing head, and the upper end of the sealing head is connected with a breather pipe for introducing inert gas. In the sintering process, inert gas is guided to the hanging head through the breather pipe and the air channel in the quartz guide rod and uniformly seeps out from the through holes in the side wall of the hanging head, so that a local isolation protective atmosphere is formed around the graphite bolt body, and the graphite bolt body is effectively prevented from being oxidized and lost in a high-temperature oxygen-containing chlorine environment; meanwhile, the high-temperature strength of the graphite material is utilized to stably bear a large-size loose body, the rod breaking risk is remarkably reduced, and the service life of the bolt is prolonged.

Description

Technical Field

[0001] This invention relates to the field of ultra-low hydroxyl glass preparation technology, and in particular to a suspension connection device for loose body sintering. Background Technology

[0002] In the fabrication of ultra-low hydroxyl glass, especially in the process of preparing optical fiber preforms using VAD (vapor axial deposition) technology, the sintering of the loose material in a high-temperature chlorine atmosphere is a crucial densification step. Achieving a reliable and stable connection between the loose material and the sintering equipment is fundamental to ensuring the smooth operation of this process. Traditional connection methods commonly use ceramic pins; however, with the continuous increase in preform size and loose material weight, this method has significant limitations. At sintering temperatures as high as 1200℃ to 1600℃, the high-temperature strength and creep resistance of ceramic materials decrease, making it difficult to stably support the weight of large loose materials. This easily leads to thermal deformation or even brittle fracture, resulting in serious preform breakage production failures, severely impacting production efficiency and product yield.

[0003] To improve the high-temperature load-bearing capacity of connectors, although a solution using high-strength graphite materials has been attempted, in actual non-vacuum sintering atmospheres (containing chlorine and trace amounts of oxygen), graphite pins undergo a violent oxidation reaction at high temperatures, leading to rapid wear and extremely short service life. This cannot meet the economic and stability requirements of large-scale continuous production. Therefore, a suspension connection device for loose body sintering is proposed here. Summary of the Invention

[0004] This invention addresses the problems of easy high-temperature deformation and breakage of ceramic pins and easy oxidation and loss of graphite pins during the sintering of large-sized loose materials in the VAD process of existing technologies. It provides a suspension connection device for loose material sintering. By integrating a hollow quartz guide rod and a rotatable sealing head to form an inert gas introduction channel, the gas is directionally seeped out through the through hole on the side wall of the suspension head, forming a local isolation and protective atmosphere around the graphite pin. This effectively prevents the oxidation of graphite while utilizing its excellent high-temperature strength, thus achieving a stable, reliable and long-life high-temperature connection for large-sized loose materials.

[0005] The technical solution adopted in this invention is:

[0006] A suspension connection device for loose mass sintering, comprising:

[0007] A quartz isolation cover, wherein a first cover plate is fixedly connected to the upper side of the quartz isolation cover;

[0008] A furnace core tube is connected to the lower side of the quartz isolation cover, and a second cover plate is fixedly connected to the upper side of the furnace core tube;

[0009] A quartz guide rod is inserted through the quartz isolation cover, with its upper end located at the upper part of the quartz isolation cover and its lower end extending into the furnace core tube. The interior of the quartz guide rod has an air passage that connects the upper and lower parts.

[0010] The hanging head is sealed to the lower end of the quartz rod. The hanging head has an internal mounting cavity. The air passage is connected to the mounting cavity. The mounting cavity is used to accommodate the handle of the loose material. The side wall of the mounting cavity has an insertion hole.

[0011] The graphite pin body is adapted to the socket, detachably inserted into the socket, and connected to the handle bar in the mounting cavity.

[0012] Optionally, the furnace core tube includes an upper cylinder and a lower cylinder that are detachably and sealed together; the upper cylinder is sealed to the quartz isolation cover.

[0013] Optionally, the bottom of the lower cylinder is provided with a first air inlet and outlet, and the quartz isolation cover is provided with an inner cavity and a second air inlet and outlet communicating with the inner cavity, the inner cavity communicating with the inside of the furnace core tube.

[0014] Optionally, a quartz disk is fixedly connected to the outside of the quartz guide rod. The inner diameter of the quartz guide rod is 5-8 mm, and the outer diameter of the quartz disk is 40-50 mm smaller than the outer diameter of the furnace core tube.

[0015] Optionally, the handle bar is provided with a through hole, the size of which is adapted to the diameter of the graphite pin body, the diameter of which is 8~12mm, and the clearance fit tolerance between the through hole and the graphite pin body is 0.1~0.3mm.

[0016] Optionally, a sealing head is rotatably connected to the upper end of the quartz rod, and a vent pipe for introducing inert gas is rotatably connected to the upper end of the sealing head. Two sets of first sealing rings arranged in parallel are installed on the upper inner side of the sealing head, and the end of the vent pipe is rotatably connected between the two sets of first sealing rings. Two sets of second sealing rings arranged in parallel are installed on the lower inner side of the sealing head, and the end of the quartz rod is rotatably connected between the two sets of second sealing rings.

[0017] Optionally, the side wall of the hanging head is provided with at least one through hole, the diameter of which is 1~2mm.

[0018] A method of using a suspension connection device for loose body sintering is also provided, comprising the following steps:

[0019] S1: Insert the graphite pin body into the through hole outside the handle bar and the insertion hole outside the hanging head to complete the mechanical fixation between the loose body body and the hanging head;

[0020] S2: Sealed furnace core tube, inert gas is introduced from the upper end of the quartz guide rod, so that the inert gas is guided through the gas channel to the installation cavity in the hanging head, forming an isolation atmosphere in the area around the graphite pin body;

[0021] S3: The device connected to the loose body is sent into the heating zone of the sintering furnace for sintering, and inert gas is continuously introduced during the sintering process.

[0022] S4: After sintering is complete, remove the connecting device and stop the inert gas supply.

[0023] Optionally, the inert gas introduced is helium, and the inert gas flow rate is 0.5~1L / min.

[0024] Optionally, the method further includes step S21, which involves continuously introducing chlorine and helium into the furnace core tube.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. By replacing traditional ceramic parts with graphite pin bodies and designing a stable connection structure consisting of hanging heads, insertion holes and perforations, the load-bearing problem of large-sized loose bodies during high-temperature sintering is fundamentally solved, effectively preventing rod breakage caused by high-temperature deformation or fracture of the connecting parts.

[0027] 2. By integrating an inert gas directional protection structure consisting of a sealing head, a vent pipe, an internal gas channel of the quartz guide rod, and a through hole on the side wall of the hanging head, protective gases such as helium can be precisely guided to the small high-temperature area where the graphite pin body is located, forming a continuous and stable local isolation atmosphere. This significantly suppresses the oxidation loss of the graphite pin in a non-vacuum oxidizing sintering environment and greatly extends its service life.

[0028] 3. By designing a sealing structure that includes a rotatable sealing head, a reliable sealed connection between the quartz guide rod and the external fixed gas supply system was successfully achieved during the rotational movement required by the process. This ensured the continuity of the protective gas supply and enabled the two major functions of high strength load-bearing and active gas protection to operate synergistically and stably in the dynamic sintering process. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of the suspension connection device for loose body sintering according to the present invention;

[0031] Figure 2 This is a front sectional view of the suspension connection device for loose body sintering of the present invention;

[0032] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0033] Figure 4 for Figure 2 Enlarged view of B in the middle;

[0034] Figure 5 for Figure 2 Enlarged view of C;

[0035] Figure 6 This is a schematic diagram of the overall structure of the hanging head in this invention;

[0036] Figure 7 This is a schematic diagram of the overall structure of the VAD loose body in this invention;

[0037] Figure 8 for Figure 7 Enlarged view of D;

[0038] Figure 9 This is a schematic diagram of the overall structure of the sintering section in this invention;

[0039] Figure 10 for Figure 9 Enlarged view of E in the middle;

[0040] Figure label:

[0041] 1. Quartz isolation cover; 2. Furnace core tube; 3. Limiting ring; 4. Sealing sleeve; 5. Quartz guide rod; 6. Quartz disc; 7. Hanging head; 8. Gas passage; 9. Mounting cavity; 10. Insertion hole; 11. Loose body; 12. Handle rod; 13. Perforation; 14. Graphite pin body; 15. Sealing head; 16. Vent pipe; 17. First sealing ring; 18. Second sealing ring; 19. Through hole; 20. First air inlet / outlet; 21. Second air inlet / outlet; 22. First cover plate; 23. Second cover plate. Detailed Implementation

[0042] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

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

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

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

[0047] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0048] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] like Figures 1 to 10 As shown, this embodiment of the invention provides a suspension connection device for high-temperature sintering of VAD loose materials, including a quartz isolation cover 1 as the overall installation and positioning base, a furnace core tube 2 for providing environmental sealing and connecting the loose material conveying mechanism, a quartz guide rod 5 as an inert gas conveying channel and core support component, a hanging head 7 for supporting and positioning the loose material body 11, and a graphite pin body 14 as a key component for high-temperature load-bearing connection. A first cover plate 22 is fixedly connected to the upper side of the quartz isolation cover 1, and the furnace core tube 2 is rotatably connected to the lower side of the quartz isolation cover 1 to adapt to the rotation requirements during the sintering process. A second cover plate 23 is fixedly connected to the upper side of the furnace core tube 2, and the quartz guide rod 5 is vertically inserted and fixed to the quartz isolation cover 1. The quartz isolation cover 1 extends to the upper part of the quartz isolation cover 1 to connect to the gas supply system, and the lower end extends into the furnace core tube 2. The quartz guide rod 5 has a first gas channel 8 that runs vertically through it to transport protective gas. The hanging head 7 is fixed to the lower end of the quartz guide rod 5 by a sealed connection. The hanging head 7 has an installation cavity 9 inside it to accommodate the top handle rod 12 of the loose body 11. The first gas channel 8 is connected to the installation cavity 9. The side wall of the installation cavity 9 has an insertion hole 10. The graphite pin body 14 is adapted to the insertion hole 10, is detachably inserted into the insertion hole 10 and extends into the installation cavity 9, so as to cooperate with the through hole 13 on the handle rod 12 to realize the mechanical connection and load-bearing between the hanging head 7 and the loose body 11.

[0050] In another embodiment, such as Figure 2 as well as Figure 5 As shown, the furnace core tube 2 adopts a detachable cylindrical structure with upper and lower threaded connections at the hanging head 7, which facilitates the assembly, maintenance, and inspection of internal components of the device.

[0051] In another embodiment, such as Figure 2 as well as Figure 3As shown, the furnace core tube 2 is externally fixedly connected with two sets of limiting rings 3 for axial positioning and structural reinforcement. A sealing sleeve 4 for dynamic sealing is fixedly connected between the two sets of limiting rings 3, and the sealing sleeve 4 is sealed to the bottom of the quartz isolation cover 1 to ensure the sealing between the furnace core tube 2 and the quartz isolation cover 1 when rotating.

[0052] In another embodiment, such as Figure 2 as well as Figure 3 As shown, the bottom of the furnace core tube 2 is provided with a first inlet / outlet 20 for introducing or discharging process gas. The quartz isolation cover 1 is provided with an inner cavity and a second inlet / outlet 21 connected to the inner cavity. The inner cavity is sealed and connected to the inside of the furnace core tube 2, together forming a channel for auxiliary process gas circulation or furnace pressure balance.

[0053] In another embodiment, such as Figure 2 As shown, a quartz disk 6 is fixedly connected to the outside of the quartz guide rod 5. The inner diameter of the quartz guide rod 5 is designed to be 5~8mm to balance the gas flow rate and structural strength. The outer diameter of the quartz disk 6 is 40mm~50mm smaller than the outer diameter of the furnace core tube 2.

[0054] In another embodiment, such as Figure 6 as well as Figure 10 As shown, the handle 12 at the top of the loose body 11 has a through hole 13 on the outside. The size of the through hole 13 is precisely matched with the diameter of the graphite pin body 14. The graphite pin body 14 is preferably made of high-strength, high-temperature resistant CC carbon rod, with a typical diameter of 8~12mm. The through hole 13 and the graphite pin body 14 are fitted with a clearance, with a tolerance controlled within 0.1~0.3mm, to ensure reliable connection while facilitating assembly and disassembly.

[0055] In another embodiment, such as Figure 2 as well as Figure 4 As shown, a sealing head 15 is rotatably connected to the upper end of the quartz rod 5 to achieve dynamic sealing and gas introduction. A vent pipe 16 for introducing inert gas is rotatably connected to the upper end of the sealing head 15. Two sets of first sealing rings 17 arranged in parallel are installed on the upper inner side of the sealing head 15. The end of the vent pipe 16 is rotatably connected between the two sets of first sealing rings 17 to form a first rotary dynamic seal. Two sets of second sealing rings 18 arranged in parallel are installed on the lower inner side of the sealing head 15. The end of the quartz rod 5 is rotatably connected between the two sets of second sealing rings 18 to form a second rotary dynamic seal. This double sealing structure ensures that the inert gas supply is continuous and leak-free when the quartz rod 5 rotates.

[0056] In another embodiment, such as Figure 6As shown, the side wall of the hanging head 7 is provided with at least one through hole 19 for inert gas to seep out. The diameter of the through hole 19 is preferably 1~2mm to ensure that the protective gas can form a local isolation atmosphere uniformly and stably around the graphite pin body 14.

[0057] A method of using a suspension connection device for loose body sintering is also provided, comprising the following steps:

[0058] First, insert the graphite pin body 14 into the through hole 13 outside the handle bar 12 and the insertion hole 10 outside the hanging head 7 to complete the mechanical fixation between the loose body body 11 and the hanging head 7.

[0059] Then, the furnace core tube is sealed, and inert gas is introduced from the upper end of the quartz lead rod 5, so that the inert gas is guided through the gas channel 8 to the mounting cavity 9 in the hanging head 7, forming an isolation atmosphere in the area around the graphite pin body 14.

[0060] Next, the device connected to the loose body 11 is sent into the heating zone of the sintering furnace for sintering, and inert gas is continuously introduced during the sintering process.

[0061] Finally, after sintering is complete, remove the connecting device and stop the inert gas supply.

[0062] In another embodiment, the inert gas introduced is helium, and the inert gas flow rate is 0.5~1L / min.

[0063] In another embodiment, chlorine and helium are continuously introduced into the furnace core tube.

[0064] Specific working principle:

[0065] This invention addresses the deformation and fracture problems caused by the softening and insufficient load-bearing capacity of traditional ceramic pins during the sintering of large loose materials in a chlorine atmosphere in the VAD process. It proposes an innovative solution that integrates high-strength load-bearing capacity and active gas protection. The core of this solution is to replace the ceramic parts with high-purity graphite pin bodies 14 as mechanical connectors, and to solve the key contradiction of easy oxidation of graphite in a high-temperature oxygen-containing chlorine environment through an integrated inert gas local protection system.

[0066] First, the load-bearing function is achieved by the high-purity graphite pin body 14, which is inserted between the hanging head 7 and the handle bar 12 at the top of the loose body 11. Utilizing the high strength and low creep of graphite material at high temperatures of 1400-1600℃, it reliably supports the entire weight of the large loose body 11, fundamentally eliminating the risk of bar breakage.

[0067] Secondly, the device has an anti-oxidation protection function. The sealing head 15 located in the low-temperature zone outside the furnace is connected to a vent pipe 16. Inert gas (usually high-purity helium) is introduced into the hollow quartz guide rod 5 through this pipe. The quartz guide rod 5 serves as a high-temperature resistant gas channel, which delivers the gas through the gas channel 8 inside and the mounting cavity 9 inside the hanging head 7 to the hanging head 7 at the end of the high-temperature zone. The hanging head 7 serves as a gas distributor, and several millimeter-level precision through holes 19 are evenly opened around its side wall. After the helium gas seeps out evenly through this, it does not diffuse throughout the entire furnace, but precisely forms a continuous and stable local inert gas isolation layer in the narrow connection area where the graphite pin body 14 is located. This gas curtain effectively blocks the contact between the external sintering atmosphere (mainly containing chlorine and trace amounts of oxygen) and the high-temperature graphite surface, thereby inhibiting the occurrence of oxidation reaction.

[0068] The effectiveness of this protection mechanism is highly dependent on the fine design of the device. The specific helium flow rate and the size of the through hole 19 are matched and optimized to form a stable protective atmosphere with the minimum necessary flow rate. If the flow rate is too low, the gas curtain strength will be insufficient and unable to resist the scouring of the process airflow. The airflow that continuously seeps out from the hanging head 7 can also form an auxiliary gas barrier for the connection part of the loose body 11 below, which helps to reduce the backflow of furnace mouth air at the beginning and end of the sintering stage and improve the consistency of the process end.

[0069] Meanwhile, the sealing head 15 adopts a rotatable dynamic sealing structure, which is rotatably connected to the end of the vent pipe 16 through the first sealing ring 17 set on the upper inner side, and rotatably connected to the end of the quartz guide rod 5 through the second sealing ring 18 set on the lower inner side. This structure ensures that the inert gas supply pipeline remains sealed and connected during the rotational movement required by the hollow quartz guide rod 5 in the sintering process, realizing the compatibility of rotation and continuous pressure gas supply.

[0070] This device creatively combines high-strength graphite load-bearing components with directional and controllable micro-area atmosphere protection technology. Without altering the core sintering process, it innovates only the connection device, which significantly extends the service life of the graphite pin body 14 in harsh environments. At the same time, it significantly improves the load-bearing safety and process stability of the sintering process of large loose materials.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A suspension connection for sintering of bulk material, characterized in that The utility model relates to a loose body loading device, including: Quartz isolation cover (1), quartz isolation cover (1) upper side fixedly connected with first cover disc (22); Furnace core pipe (2) is connected to the lower side of quartz isolation cover (1), and the upper side of furnace core pipe (2) is fixedly connected with second cover disc (23); Quartz guide rod (5) is arranged in quartz isolation cover (1), and the upper end is located in the upper part of quartz isolation cover (1), and the lower end extends into furnace core pipe (2), and the inside of quartz guide rod (5) is provided with gas passage (8) that communicates up and down; Hanging head (7) is sealingly connected to the lower end of quartz guide rod (5), and the inside of hanging head (7) is provided with mounting cavity (9), and gas passage (8) is communicated with mounting cavity (9), and mounting cavity (9) is used to accommodate handle stick (12) of loose body, and the side wall of mounting cavity (9) is provided with insertion hole (10); Graphite insertion body (14) is matched with insertion hole (10), is detachably arranged in insertion hole (10) and is connected with handle stick (12) in mounting cavity (9).

2. A suspension connection for sintering of bulk material according to claim 1, characterized in that: The furnace core pipe (2) includes a detachable sealingly connected upper cylinder and a lower cylinder, and the upper cylinder is sealingly connected with the quartz isolation cover (1).

3. A suspension connection for sintering of bulk material according to claim 2, characterized in that: The bottom of the lower cylinder is provided with a first air inlet and outlet (20), the quartz isolation cover (1) is provided with an inner cavity and a second air inlet and outlet (21) communicating with the inner cavity, and the inner cavity is in communication with the inside of the furnace core pipe (2).

4. A suspension connection for sintering of bulk material according to claim 2, characterized in that: The quartz guide rod (5) is fixedly connected with a quartz disc (6) on the outside, the inner diameter of the quartz guide rod (5) is 5-8 mm, and the outer diameter of the quartz disc (6) is less than the outer diameter of the furnace core pipe (2) by 40-50 mm.

5. The hanging connection device for sintering of bulk material according to claim 1, characterized in that: The handle stick (12) is provided with a perforation (13), the size of the perforation (13) is matched with the diameter of the graphite insertion body (14), the diameter of the graphite insertion body (14) is 8-12 mm, and the clearance fit tolerance between the perforation (13) and the graphite insertion body (14) is 0.1-0.3 mm.

6. A suspension connection for sintering of bulk material according to claim 1, characterized in that: The upper end of the quartz guide rod (5) is rotatably connected with a sealing head (15), the upper end of the sealing head (15) is rotatably connected with a gas inlet pipe (16) for introducing inert gas, two groups of first sealing rings (17) are mounted on the inner side of the upper part of the sealing head (15) in parallel, the distal end of the gas inlet pipe (16) is rotatably connected between the two groups of first sealing rings (17), two groups of second sealing rings (18) are mounted on the inner side of the lower part of the sealing head (15) in parallel, and the distal end of the quartz guide rod (5) is rotatably connected between the two groups of second sealing rings (18).

7. A suspension connection for sintering of bulk material according to claim 1, characterized in that: At least one through hole (19) is provided on the side wall of the hanging head (7), and the diameter of the through hole (19) is 1-2 mm.

8. A method of using a suspension connection for sintering of bulk material according to any one of claims 1 to 7, characterized in that The utility model relates to a loose body loading device, including the following steps: S1: the graphite insertion body (14) is inserted into the perforation (13) outside the handle stick (12) and the insertion hole (10) outside the hanging head (7), and the mechanical fixing between the loose body body (11) and the hanging head (7) is completed; S2: sealing the core tube, inert gas is introduced from the upper end of the quartz guide rod (5), and the inert gas is guided to the installation cavity (9) in the hanging head (7) through the air duct (8), so as to form an isolated atmosphere around the graphite plug body (14); S3: the device connected with the loose body (11) is sent to the heating area of the sintering furnace for sintering, and inert gas is continuously introduced during the sintering process; S4: after the sintering is completed, the connecting device is taken out, and the supply of inert gas is stopped.

9. The method of using a suspension connection for sintering of bulk solids according to claim 8, characterized in that The inert gas introduced is helium, and the flow rate of the inert gas is 0.5-1 L / min.

10. The method of using a suspension connection for sintering of bulk solids according to claim 8, characterized in that It also includes step S21, continuously introducing chlorine and helium into the core tube.

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