A vacuum sintering furnace with high heat insulation performance

Abstract

The present application relates to a vacuum sintering furnace with high heat insulation performance. The heat preservation door is elastically connected to one side of the furnace door. The heat preservation door can elastically abut against the port of the heat preservation furnace lining. A plurality of second avoidance grooves are formed in the second flange array to form a second engaging portion. The elastic pressing portion is arranged inside the second engaging portion. The annular locking sleeve can rotate between a first position and a second position. In the first position, the second connecting flange can enter and exit the annular groove. In the second position, the elastic pressing portion can abut between the first engaging portion and the second engaging portion. The heat preservation door can adaptively cover the heat preservation furnace lining, so that the furnace door can continue to rotate and cover the port of the furnace barrel. At the same time, during the process of the annular locking sleeve rotating to lock the furnace door, since the elastic pressing portion elastically abuts during the process of abutting against the first engaging portion, the annular locking sleeve can still continue to rotate at this time, so that the furnace door and the furnace barrel can be closely attached, and thus the sealing performance between the furnace door and the furnace barrel is high.

Description

Technical Field

[0001] This application relates to the technical field of vacuum sintering furnaces, and particularly to a vacuum sintering furnace with high heat insulation and heat preservation performance. Background Art

[0002] A vacuum sintering furnace refers to a sintering furnace that performs protective sintering on heated items in a vacuum environment. The biggest factor affecting the sealing performance of a vacuum sintering furnace is whether the furnace barrel and the furnace door are sealed and connected. For example, in the high-temperature horizontal sintering furnace with a cylinder rotation clamping device disclosed in the Chinese utility model patent with the patent number CN201620209169.2, the locking convex block is rigidly connected to the locking ring, and the engaging convex block is rigidly connected to the front flange. Due to machining errors and installation errors, during the process of the locking ring rotating to lock the furnace door, multiple locking convex blocks and engaging convex blocks need to mesh with each other pairwise. There are several pairs of locking convex blocks and engaging convex blocks that have been fully meshed (rigidly contacted and tightened), while the remaining pairs of locking convex blocks and engaging convex blocks have not been meshed (not yet contacted and tightened). Since several pairs of locking convex blocks and engaging convex blocks have been fully meshed, that is, rigidly contacted and tightened, at this time, the locking ring cannot continue to rotate to make the remaining unmeshed locking convex blocks and engaging convex blocks continue to mesh, resulting in the position of the furnace door corresponding to the unmeshed part not fitting tightly enough with the furnace barrel, resulting in poor sealing performance between the position of the furnace door corresponding to the unmeshed part and the furnace barrel, and further resulting in poor sealing performance between the furnace door and the furnace barrel, affecting the sealing performance and vacuum degree of the vacuum sintering furnace, and affecting the sintering effect of the vacuum sintering furnace.

[0003] For example, in the silicon carbide ceramic sheet sintering furnace disclosed in the Chinese utility model patent with the patent number CN202120559592.6, during the process of the furnace door covering the port of the furnace barrel by rotation, due to machining errors and installation errors, there is a situation where the heat preservation door interferes with the heat preservation furnace lining, resulting in the furnace door being unable to continue rotating, and thus the furnace door cannot cover the port of the furnace barrel, affecting the sealing performance of the vacuum sintering furnace. At the same time, since the heat preservation furnace lining is rigidly fixed inside the furnace barrel, and the heat preservation door is rigidly fixed on the furnace door, and due to machining errors and installation errors, after the furnace door rotates and seals to cover the port of the furnace barrel, there is a situation where the heat preservation door has not covered the port of the heat preservation furnace lining, and there is a gap between them, resulting in heat loss from the heat preservation chamber through the gap, affecting the heat preservation performance of the vacuum sintering furnace; or, when the furnace door has not been sealed to cover the port of the furnace barrel, the heat preservation door has already covered the port of the heat preservation furnace lining, resulting in the furnace door being unable to continue rotating, and the furnace door cannot be sealed to cover the port of the furnace barrel, affecting the sealing performance of the vacuum sintering furnace. Summary of the Invention

[0004] Based on this, in view of the problem of poor sealing performance between the furnace door and the furnace barrel in the prior art, this application provides a vacuum sintering furnace with high heat insulation and heat preservation performance to solve the above problems in the prior art.

[0005] A vacuum sintering furnace with high heat insulation and heat preservation performance comprises a furnace barrel, a furnace door, an insulation furnace lining, an insulation door and a clamping device, wherein the furnace door is pivotally connected to one side of the furnace barrel, the insulation furnace lining is arranged in the furnace barrel, the insulation door is elastically connected to one side of the furnace door, and when the furnace door is sealed and covered on the port of the furnace barrel, the insulation door elastically abuts against the port of the insulation furnace lining to cover the port of the insulation furnace lining, a first connecting flange is arranged on the outer side of the port of the furnace barrel, a second connecting flange is arranged on the outer edge of the furnace door, a plurality of first avoidance grooves are arranged in the second connecting flange array to form a first clamping portion, and the clamping device comprises a ring shaped locking sleeve and a plurality of elastic tightening parts, the annular locking sleeve has an annular groove, the two sides of the annular groove are a first flange and a second flange, the first connecting flange is sleeved in the annular groove, the first flange is rotatably matched with the first connecting flange, the second flange array is provided with a plurality of second avoidance grooves to form a second clamping part, the elastic tightening part is arranged on the inner side of the second clamping part, the annular locking sleeve can be rotated between a first position and a second position, in the first position, the second connecting flange can enter and exit the annular groove, and in the second position, the elastic tightening part can abut between the first clamping part and the second clamping part.

[0006] Preferably, in the above-mentioned vacuum sintering furnace with high thermal insulation, the second clamping part is provided with a first through hole, the elastic tightening part includes a first wedge block, an elastic sleeve and a first guide rod, one end of the first guide rod is connected to the first wedge block, and the other end passes through the first through hole, and the first guide rod is guided and matched with the first through hole, the elastic sleeve is sleeved on the first guide rod, and the elastic sleeve is located between the first wedge block and the inner side of the second clamping part.

[0007] Preferably, in the above-mentioned vacuum sintering furnace with high heat insulation, an anti-dropping protrusion is provided at one end of the first guide rod away from the first wedge-shaped block, and the outer diameter of the anti-dropping protrusion is larger than the inner diameter of the first through hole.

[0008] Preferably, in the above-mentioned vacuum sintering furnace with high heat insulation, a second wedge block is provided on the first engaging portion, and when the annular locking sleeve rotates from the first position to the second position, the elastic pressing portion and the second wedge block abut and engage with each other.

[0009] Preferably, in the above-mentioned vacuum sintering furnace with high thermal insulation, in the second position, the first connecting flange is fitted with the second connecting flange, and an elastic sealing ring is arranged between the two, and the surface of the elastic tightening part facing the first clamping part is a smooth coating and is provided with grease.

[0010] Preferably, in the above-mentioned vacuum sintering furnace with high thermal insulation, the furnace door includes a furnace door shell, an elastic member and a second guide rod extending from the furnace door shell toward the thermal insulation furnace lining, and a limiting protrusion is provided at the end of the second guide rod facing away from the furnace door shell, the thermal insulation door is provided with a second through hole, the second guide rod is passed through the second through hole, and the guide slides together, the thermal insulation door is located between the limiting protrusion and the furnace door shell, the elastic member is sleeved on the second guide rod, and elastically abuts between the thermal insulation door and the furnace door shell, and when the furnace door seal covers the port of the furnace barrel, the thermal insulation door covers the port of the thermal insulation furnace lining, and the distance between the thermal insulation door and the limiting protrusion is greater than zero.

[0011] Preferably, the above-mentioned vacuum sintering furnace with high thermal insulation performance also includes a driving member and a sealing member, the thermal insulation door includes a main body and a raised portion raised from the main body toward the thermal insulation furnace lining, the main body is provided with the second through hole, and the main body is provided with a threaded hole, the furnace door shell is provided with a through hole, the sealing member can seal and cover the through hole, one end of the driving member can pass through the through hole and threadedly cooperate with the threaded hole, the driving member is rotatably cooperated with the through hole, when the furnace door seal covers the port of the furnace barrel, the main body covers the port of the thermal insulation furnace lining, the raised portion is located in the thermal insulation furnace lining and fits with the inner wall of the thermal insulation furnace lining, the driving member can drive the main body to move in a direction away from the thermal insulation furnace lining, and the elastic member can drive the main body to move in a direction close to the thermal insulation furnace lining.

[0012] Preferably, in the above-mentioned vacuum sintering furnace with high thermal insulation, the through hole has a limiting step surface, and the driving member has a limiting protrusion. When one end of the driving member passes through the through hole and is threadedly engaged with the threaded hole, the limiting protrusion is limitedly engaged with the limiting step surface. When the driving member is rotated, one end of the driving member is screwed into the threaded hole to drive the main body away from the thermal insulation furnace lining.

[0013] Preferably, the above-mentioned vacuum sintering furnace with high thermal insulation performance also includes an elastic sealing ring, the port of the perforation is provided with a first sealing groove, and the sealing member is provided with a second sealing groove, and when the sealing member seals and covers the perforation, the first sealing groove is opposite to the second sealing groove, and the elastic sealing ring is elastically compressed between the first sealing groove and the second sealing groove.

[0014] Preferably, in the above-mentioned vacuum sintering furnace with high thermal insulation, the number of the elastic parts, the second guide rods and the second through holes are multiple and equal, the elastic parts, the second guide rods and the second through holes are arranged one by one and are evenly arranged around the thermal insulation door.

[0015] The technical solution adopted in this application can achieve the following beneficial effects:

[0016] In a vacuum sintering furnace with high heat insulation performance disclosed in an embodiment of this application, the heat preservation door is elastically connected to one side of the furnace door. When the furnace door is hermetically closed on the port of the furnace barrel, the heat preservation door elastically abuts against the port of the heat preservation furnace lining. During the process that the heat preservation door gradually approaches the heat preservation furnace lining as the furnace door rotates, at the position where the furnace door is hinged to the furnace barrel, the heat preservation door first touches the heat preservation furnace lining, and then the furnace door continues to rotate. The heat preservation furnace lining reacts on the heat preservation door, forcing the heat preservation door to move towards the direction of the furnace door, that is, the heat preservation door moves away from the heat preservation furnace lining, so as to realize the heat preservation door avoiding the heat preservation furnace lining until the heat preservation door and the heat preservation furnace lining are adaptively closed, and the furnace door is just hermetically closed on the port of the furnace barrel, thereby being able to solve the problem of the gap existing between the situation that the furnace door cannot be closed to the port of the furnace barrel and the situation that the heat preservation door has not been closed to the port of the heat preservation furnace lining. At the same time, during the process that the annular locking sleeve rotates to lock the furnace door, a plurality of elastic pressing parts are correspondingly abutted against a plurality of first engaging parts one by one. Since the elastic pressing parts are elastically pressed during the process of pressing against the first engaging parts, rather than rigidly contacting and pressing, there is a certain amount of elastic deformation. Therefore, at this time, the annular locking sleeve can still continue to rotate, so that the pairs of elastic pressing parts and first engaging parts that have not been abutted can continue to be pressed tightly, enabling all the elastic pressing parts and first engaging parts to be mutually pressed tightly, thereby being able to make the fit between the furnace door and the furnace barrel tight, and further making the sealing performance between the furnace door and the furnace barrel high, ensuring the sealing performance and vacuum degree of the vacuum sintering furnace, and guaranteeing the sintering effect of the vacuum sintering furnace. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a vacuum sintering furnace with high heat insulation performance disclosed in an embodiment of this application;

[0018] Figure 2 is Figure 1 a partial schematic diagram of;

[0019] Figure 3 It is a schematic diagram when the heat preservation door is closed on the port of the heat preservation furnace lining in a vacuum sintering furnace with high heat insulation performance disclosed in an embodiment of this application;

[0020] Figure 4 is Figure 3 a partial schematic diagram of;

[0021] Figure 5 is Figure 3 another partial schematic diagram of;

[0022] Figure 6 It is a schematic diagram when the heat preservation door is separated from the heat preservation furnace lining in a vacuum sintering furnace with high heat insulation performance disclosed in an embodiment of this application;

[0023] Figure 7 is Figure 6 a partial schematic view of;

[0024] Figure 8 is a partial structural schematic view of a vacuum sintering furnace with high heat insulation and heat preservation disclosed in an embodiment of the present application;

[0025] Figure 9 is a partial structural schematic view of a vacuum sintering furnace with high heat insulation and heat preservation disclosed in an embodiment of the present application;

[0026] Figure 10 is Figure 9 a partially enlarged schematic view of;

[0027] Figure 11 is a schematic view of a clamping device disclosed in an embodiment of the present application;

[0028] Figure 12 is a cross-sectional schematic view of a clamping device disclosed in an embodiment of the present application;

[0029] Figure 13 is a schematic view of an annular locking sleeve disclosed in an embodiment of the present application;

[0030] Figure 14 is a schematic view of a furnace door disclosed in an embodiment of the present application.

[0031] Wherein: furnace cylinder 100, first connection flange 110, furnace door 200, second connection flange 210, first avoidance groove 220, first engaging portion 230, second wedge block 231, furnace door shell 240, elastic member 250, second guide rod 260, limit convex block 270, through hole 280, limit step surface 281, first sealing groove 282, heat preservation furnace lining 300, heat preservation door 400, body portion 410, protruding portion 420, second through hole 430, threaded hole 440, clamping device 500, annular locking sleeve 510, first flange 511, second flange 512, second avoidance groove 513, second engaging portion 514, first through hole 515, elastic pressing portion 520, first wedge block 521, elastic sleeve 522, first guide rod 523, anti-falling convex block 524, annular groove 530, driving member 600, limit protrusion 610, hand-held operation portion 620, sealing member 700, second sealing groove 710, elastic sealing ring 800. Detailed implementation manners

[0032] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] Please refer to Figures 1 to 14 , an embodiment of the present application discloses a vacuum sintering furnace with high heat insulation performance, including a furnace barrel 100, a furnace door 200, a heat preservation furnace lining 300, a heat preservation door 400 and a clamping device 500, wherein:

[0036] The heat preservation furnace lining 300 is disposed in the furnace barrel 100. The furnace door 200 is pivotally connected to one side of the furnace barrel 100. The furnace door 200 is rotatably and sealingly covered on the port of the furnace barrel 100. The furnace door 200 can be covered on the port of the furnace barrel 100 by rotating. That is to say, the furnace door 200 realizes the opening and closing operation by rotating. The heat preservation door 400 is elastically connected to one side of the furnace door 200. When the furnace door 200 is sealingly covered on the port of the furnace barrel 100, the heat preservation door 400 elastically abuts against the port of the heat preservation furnace lining 300 to cover the port of the heat preservation furnace lining 300, so that the heat preservation door 400 can block the port of the heat preservation furnace lining 300 and avoid heat loss due to the existence of a gap between the two, thereby preventing heat from dissipating through the gap and improving the heat preservation sealing performance between the heat preservation door 400 and the port of the heat preservation furnace lining 300.

[0037] In the specific usage process, when the furnace door 200 needs to be closed, the furnace door 200 is hermetically covered on the port of the furnace barrel 100 by rotating. During the process that the furnace door 200 is covered on the port of the furnace barrel 100 by rotating, the heat preservation door 400 gradually approaches the heat preservation furnace lining 300 as the furnace door 200 rotates. Even if the heat preservation door 400 touches the heat preservation furnace lining 300 (the situation where the heat preservation door 400 interferes with the heat preservation furnace lining 300), under the action of the heat preservation furnace lining 300, since the heat preservation door 400 is elastically connected to one side of the furnace door 200, the heat preservation furnace lining 300 drives the heat preservation door 400 to move towards the direction of the furnace door 200, so that the heat preservation door 400 avoids the heat preservation furnace lining 300, and further enables the furnace door 200 to continue rotating, so as to avoid the situation that the furnace door 200 cannot continue to rotate due to the interference between the heat preservation door 400 and the heat preservation furnace lining 300, and enables the furnace door 200 to continue rotating and then cover the port of the furnace barrel 100.

[0038] Meanwhile, even if the heat preservation door 400 has been covered on the port of the heat preservation furnace lining 300, while the furnace door 200 has not been hermetically covered on the port of the furnace barrel 100, under the action of the heat preservation furnace lining 300, it drives the heat preservation door 400 to move towards the direction of the furnace door 200, so that the heat preservation door 400 avoids the heat preservation furnace lining 300, and further enables the furnace door 200 to continue rotating, so that the furnace door 200 is hermetically covered on the port of the furnace barrel 100, ensuring the sealing performance of the vacuum sintering furnace.

[0039] Therefore, the technical solution disclosed in this application can solve the problems in the prior art that "there is a situation where the heat preservation door interferes with the heat preservation furnace lining, resulting in the furnace door being unable to continue rotating, and thus the furnace door cannot be covered on the port of the furnace barrel, affecting the sealing performance of the vacuum sintering furnace." and "when the furnace door has not been hermetically covered on the port of the furnace barrel, the heat preservation door has already been covered on the port of the heat preservation furnace lining, resulting in the furnace door being unable to continue rotating and the furnace door cannot be hermetically covered on the port of the furnace barrel, affecting the sealing performance of the vacuum sintering furnace."

[0040] In the prior art, the thermal insulation furnace lining 300 is rigidly fixed inside the furnace barrel 100, and the thermal insulation door 400 is rigidly fixed on the furnace door 200. During the process of covering the furnace door 200 to the port of the furnace barrel 100 by rotation, the thermal insulation door 400 gradually approaches the thermal insulation furnace lining 300 as the furnace door 200 rotates. When the thermal insulation door 400 touches the thermal insulation furnace lining 300 (in the case where the thermal insulation door 400 interferes with the thermal insulation furnace lining 300 or the thermal insulation door 400 has been covered to the port of the thermal insulation furnace lining 300), in order for the furnace door 200 to be covered with the furnace barrel 100, a common method is to apply a greater driving force on the furnace door 200 so that the furnace door 200 can be covered with the furnace barrel 100. This will result in a greater abutting force between the thermal insulation door 400 and the thermal insulation furnace lining 300. Since the thermal insulation door 400 and the thermal insulation furnace lining 300 are usually made of graphite, when the abutting force is greater, the contact part between the thermal insulation door 400 and the thermal insulation furnace lining 300 is easily damaged, affecting the sealing performance. At the same time, the damage will generate impurities such as graphite particles and graphite debris. The graphite particles, graphite debris and other impurities will fall into the thermal insulation furnace lining 300 (the sintering area of the vacuum sintering furnace), and the graphite particles, graphite debris and other impurities seriously affect the quality of the sintered products during the sintering process of the vacuum sintering furnace. As described above, in the technical solution disclosed in the present application, even if the thermal insulation door 400 touches the thermal insulation furnace lining 300 (in the case where the thermal insulation door 400 interferes with the thermal insulation furnace lining 300), under the action of the thermal insulation furnace lining 300, since the thermal insulation door 400 is elastically connected to one side of the furnace door 200, the thermal insulation furnace lining 300 drives the thermal insulation door 400 to move towards the furnace door 200, so that the thermal insulation door 400 avoids the thermal insulation furnace lining 300, preventing hard contact and damage between the two, and further enabling the furnace door 200 to continue to rotate, so as to avoid the need to apply a greater driving force on the furnace door 200 to make the furnace door 200 cover the furnace barrel 100, thereby preventing the above-mentioned damage and problems affecting the quality of the sintered products.

[0041] In the prior art, the thermal insulation door 400 is rigidly fixed on the furnace door 200. Therefore, the distance between the thermal insulation door 400 and the furnace door 200 is fixed. Assuming that under normal circumstances (the furnace door 200 is hermetically covered to the port of the furnace barrel 100), the distance between the thermal insulation door 400 and the furnace door 200 is the first distance. In the present application, when the furnace door 200 is hermetically covered to the port of the furnace barrel 100, the thermal insulation door 400 elastically abuts against the port of the thermal insulation furnace lining 300. At this time, the distance between the thermal insulation door 400 and the furnace door 200 is equal to the first distance. However, since the thermal insulation door 400 elastically abuts against the port of the thermal insulation furnace lining 300 at this time, it indicates that the force exerted by the thermal insulation furnace lining 300 on the thermal insulation door 400 (such as Figure 4 in the figure, the direction of the force is to the left) and the elastic force received by the thermal insulation door 400 (such as Figure 4In the figure, the direction of the elastic force is to the right) is in equilibrium. If the heat-insulating furnace lining 300 is removed at this time, the heat-insulating door 400 moves away from the furnace door 200 under the driving action of the elastic force, and the distance between the heat-insulating door 400 and the furnace door 200 is greater than the first distance. It can be understood that the initial distance between the heat-insulating door 400 and the furnace door 200 is greater than the first distance. Therefore, in the present application, during the process that the heat-insulating door 400 gradually approaches the heat-insulating furnace lining 300 as the furnace door 200 rotates, the heat-insulating door 400 first touches the heat-insulating furnace lining 300. At this time, the distance between the heat-insulating door 400 and the furnace door 200 is greater than the first distance. Then the furnace door 200 continues to rotate. Under the action of the heat-insulating furnace lining 300, the heat-insulating furnace lining 300 drives the heat-insulating door 400 to move towards the furnace door 200, so that the heat-insulating door 400 avoids the heat-insulating furnace lining 300. At this time, the distance between the heat-insulating door 400 and the furnace door 200 gradually decreases until it equals the first distance. The heat-insulating door 400 and the heat-insulating furnace lining 300 are adaptively closed, and the furnace door 200 is exactly sealed and closed at the port of the furnace barrel 100.

[0042] In the technical solution disclosed in the present application above, since the distance between the heat-insulating door 400 and the furnace door 200 is greater than the first distance, during the closing process of the furnace door 200, the heat-insulating door 400 first covers the port of the heat-insulating furnace lining 300, and then the furnace door 200 covers the port of the furnace barrel 100. There is no situation in the prior art that "after the furnace door 200 continues to rotate and covers the port of the furnace barrel 100, the heat-insulating door 400 has not yet covered the port of the heat-insulating furnace lining 300". Therefore, it can solve the problem in the prior art that "after the furnace door 200 rotates and is sealed and closed at the port of the furnace barrel 100, there is a situation that the heat-insulating door 400 has not yet covered the port of the heat-insulating furnace lining 300, and there is a gap between them, resulting in heat loss of the heat-insulating chamber through the gap, affecting the heat preservation performance of the vacuum sintering furnace."

[0043] During the sintering process, even if the heat-insulating furnace lining 300 and the heat-insulating door 400 are deformed due to high temperature and there are gaps, under the action of the elastic force, the heat-insulating door 400 is driven to move towards the heat-insulating furnace lining 300, so that the heat-insulating door 400 covers the port of the heat-insulating furnace lining 300, thereby enabling the heat-insulating door 400 to make adaptive adjustment according to the deformation and avoiding gaps, thus ensuring the heat preservation performance of the vacuum sintering furnace.

[0044] A first connection flange 110 is provided on the outer side of the port of the furnace barrel 100, and a second connection flange 210 is provided on the outer edge of the furnace door 200. A plurality of first avoidance grooves 220 are arranged in an array on the second connection flange 210, and a first engaging portion 230 is formed between any two adjacent first avoidance grooves 220. The clamping device 500 includes an annular locking sleeve 510 and a plurality of elastic pressing portions 520. The annular locking sleeve 510 has an annular groove 530. The inner side wall of the annular locking sleeve 510 is provided with the annular groove 530. The two side walls of the annular groove 530 are respectively a first flange 511 and a second flange 512. The first connection flange 110 is sleeved in the annular groove 530 and abuts against each other. The first flange 511 is rotationally matched with the first connection flange 110, and the annular locking sleeve 510 can rotate around the first connection flange 110. A plurality of second avoidance grooves 513 are arranged in an array on the second flange 512, and a second engaging portion 514 is formed between any two adjacent second avoidance grooves 513. The elastic pressing portion 520 is arranged inside the second engaging portion 514. Among them, the number of the first avoidance grooves 220, the first engaging portions 230, the second avoidance grooves 513, and the second engaging portions 514 are all multiple and equal in number.

[0045] The annular locking sleeve 510 can rotate between a first position and a second position. In the first position, the second connection flange 210 can enter and exit the annular groove 530. In the second position, the elastic pressing portion 520 can abut between the first engaging portion 230 and the second engaging portion 514. Specifically, when the annular locking sleeve 510 rotates to the first position, the first engaging portion 230 is opposite to the second avoidance groove 513, and the second engaging portion 514 is opposite to the first avoidance groove 220. At this time, the second connection flange 210 can enter and exit the annular groove 530. When the annular locking sleeve 510 rotates to the second position, the second connection flange 210 is located in the annular groove 530, and the first engaging portion 230 is opposite to the second engaging portion 514. The elastic pressing portion 520 abuts between the first engaging portion 230 and the second engaging portion 514, and the furnace door 200 covers the furnace barrel 100.

[0046] During the specific use process, when it is necessary to close the furnace door 200, first align the furnace door 200 with the furnace barrel 100 so that the first engaging portion 230 is opposite to the second avoiding groove 513 and the second engaging portion 514 is opposite to the first avoiding groove 220. Then, make the second connecting flange 210 enter the annular groove 530. At this time, the annular locking sleeve 510 is in the first position. Then, rotate the annular locking sleeve 510 so that the annular locking sleeve 510 rotates from the first position to the second position. During the rotation process, the elastic pressing portion 520 gradually presses against the first engaging portion 230 so that the second connecting flange 210 tightly fits against the furnace barrel 100, thereby covering the furnace door 200 on the furnace barrel 100. When it is necessary to open the furnace door 200, at this time, the annular locking sleeve 510 is in the second position. Then, rotate the annular locking sleeve 510 so that the annular locking sleeve 510 rotates from the second position to the first position. During the rotation process, the elastic pressing portion 520 gradually separates from the first engaging portion 230 so that the second connecting flange 210 gradually separates from the furnace barrel 100. When the annular locking sleeve 510 rotates to the first position, at this time, the first engaging portion 230 is opposite to the second avoiding groove 513 and the second engaging portion 514 is opposite to the first avoiding groove 220. Then, move the second connecting flange 210 out of the annular groove 530, thereby separating the furnace door 200 from the furnace barrel 100 and realizing the opening of the furnace door 200.

[0047] During the closing process of the furnace door 200, the elastic pressing part 520 gradually presses against the first engaging part 230, and the plurality of elastic pressing parts 520 are in one-to-one contact with the plurality of first engaging parts 230. Since the elastic pressing part 520 is elastic, the elastic pressing part 520 is not in rigid contact with the first engaging part 230 during the process of pressing against the first engaging part 230, but is elastically pressed, with a certain amount of elastic deformation, which can completely offset the processing error and the installation error. Therefore, during the process of the annular locking sleeve 510 rotating to lock the furnace door 200, the plurality of elastic pressing parts 520 are in one-to-one contact with the plurality of first engaging parts 230. When several pairs of the elastic pressing parts 520 are pressed against the first engaging part 230, and the remaining pairs of the elastic pressing parts 520 are not yet pressed against the first engaging part 230, since the elastic pressing part 520 is elastically pressed against the first engaging part 230 during the process of pressing against the first engaging part 230, instead of being rigidly pressed against, with a certain amount of elastic deformation. Therefore, at this time, the annular locking sleeve 510 can continue to rotate, so that the several pairs of elastic pressing parts 520 and the first clamping parts 230 that have not yet abutted can continue to abut, so that all the elastic pressing parts 520 and the first clamping parts 230 can abut against each other, so that the furnace door 200 and the furnace drum 100 can fit tightly, which solves the problem in the prior art that the locking ring cannot continue to rotate due to the rigid contact and tightening of the locking protrusions and the clamping protrusions, so that the locking protrusions that have not yet engaged can be locked. The problem of the continued engagement of the block with the locking protrusion is avoided, so as to avoid the position of the furnace door 200 corresponding to the unengaged position and the furnace drum 100 being not tightly fitted, thereby avoiding the poor sealing between the position of the furnace door 200 corresponding to the unengaged position and the furnace drum 100, and preventing air leakage between the position of the furnace door 200 corresponding to the unengaged position and the furnace drum 100, thereby making the sealing between the furnace door 200 and the furnace drum 100 high, ensuring the sealing and vacuum degree of the vacuum sintering furnace, and ensuring the sintering effect of the vacuum sintering furnace.

[0048] As described above, the elastic pressing part 520 is elastic. For example, the elastic pressing part 520 is made of a wear-resistant polymer polyurethane elastomer material, which is a new type of polymer synthetic material between rubber and plastic. It has both the high strength of plastic and the high elasticity of rubber. When the elastic pressing part 520 presses against the first engaging part 230, it is not in rigid contact with the first engaging part 230, but is elastically pressed against it, with a certain amount of elastic deformation. Specifically, the elastic pressing part 520 can be an elastic block. In an optional embodiment, the second engaging part 514 is provided with a first through hole 515. The elastic pressing part 520 includes a first wedge block 521, an elastic sleeve 522 and a first guide rod 523. One end of the first guide rod 523 is connected to the first wedge block 521, and the other end passes through the first through hole 515. The first guide rod 523 is guided and matched with the first through hole 515. The elastic sleeve 522 is sleeved on the first guide rod 523, and the elastic sleeve 522 is located between the first wedge block 521 and the inner side of the second engaging part 514. In the process of the elastic pressing part 520 pressing the first engaging part 230, the first wedge block 521 first contacts the first engaging part 230, and then the elastic sleeve 522 is gradually compressed so that the first wedge block 521 and the first engaging part 230 are elastically pressed against each other. The elastic pressing part 520 of this structure is simple in structure and easy to set.

[0049] When the furnace door 200 is opened, the first wedge block 521 is not restricted by the first locking portion 230, and the first guide rod 523 may fall out of the first through hole 515. Based on this, in an optional embodiment, an anti-drop protrusion 524 is provided at one end of the first guide rod 523 away from the first wedge block 521, and the outer diameter of the anti-drop protrusion 524 is larger than the inner diameter of the first through hole 515. The anti-drop protrusion 524 can limit the first guide rod 523 from falling out of the first through hole 515, thereby improving the structural reliability. Furthermore, the two ends of the elastic sleeve 522 are respectively connected to the first wedge block 521 and the second locking portion 514, and the maximum value of the distance between the first wedge block 521 and the first flange 511 is greater than the thickness of the first locking portion 230, thereby preventing the distance between the first wedge block 521 and the first flange 511 from becoming smaller, causing the first locking portion 230 to be more difficult to abut against the first wedge block 521, thereby improving the reliability and stability of the opening and closing of the furnace door 200, and also playing a role in preventing it from falling off.

[0050] Preferably, a second wedge block 231 may be provided on the first engaging portion 230. When the annular locking sleeve 510 rotates from the first position to the second position, the elastic pressing portion 520 and the second wedge block 231 are in mutual abutting engagement. During the closing process of the furnace door 200, the elastic pressing portion 520 gradually presses the second wedge block 231 along the inclined surface direction of the second wedge block 231, thereby pressing the first engaging portion 230, increasing the pressing force gradually and making the pressing degree closer, so that the furnace door 200 and the furnace barrel 100 are covered more tightly and the sealing effect is better.

[0051] Further, in the second position, the first connecting flange 110 and the second connecting flange 210 are in contact, and an elastic sealing ring is provided therebetween. Specifically, an elastic sealing ring is connected to the second connecting flange 210. When the furnace door 200 is closed, that is, in the second position, the elastic sealing ring is compressed and clamped between the first connecting flange 110 and the second connecting flange 210, so as to achieve a sealing effect, and further make the sealing effect between the furnace door 200 and the furnace barrel 100 better.

[0052] Preferably, the surface of the elastic pressing portion 520 facing the first engaging portion 230 is a smooth coating (such as a chrome plating coating, a nickel tungsten alloy coating, and a cobalt tungsten alloy coating, etc.), and a lubricating grease is provided. During the rotation of the annular locking sleeve 510 from the first position to the second position, the elastic pressing portion 520 gradually presses the first engaging portion 230. Both the smooth coating and the lubricating grease can play a lubricating role, avoiding the large friction between the elastic pressing portion 520 and the first engaging portion 230 resulting in difficult rotation of the annular locking sleeve 510, and also avoiding large wear between the elastic pressing portion 520 and the first engaging portion 230.

[0053] In this application, the annular locking sleeve 510 can rotate between the first position and the second position. Specifically, a vacuum sintering furnace door clamping and sealing structure disclosed in this application may further include a driving mechanism. The driving mechanism is provided on the furnace barrel 100, and the power output shaft of the driving mechanism is hinged to the annular locking sleeve 510. The driving mechanism can drive the annular locking sleeve 510 to rotate between the first position and the second position. By driving the annular locking sleeve 510 to rotate between the first position and the second position through the driving mechanism, manual participation is avoided, the automation degree of opening and closing the furnace door 200 of the vacuum sintering furnace can be improved, and the practicability is improved. The driving mechanism can be a cylinder.

[0054] As described above, the insulation door 400 is elastically connected to one side of the furnace door 200. Optionally, the furnace door 200 includes a furnace door shell 240, an elastic member 250 and a second guide rod 260 extending from the furnace door shell 240 toward the insulation furnace lining 300, and a limiting protrusion 270 is provided at one end of the second guide rod 260 away from the furnace door shell 240. The insulation door 400 is provided with a second through hole 430, and the second guide rod 260 is passed through the second through hole 430, and the guide sliding fit, the insulation door 400 is located between the limiting protrusion 270 and the furnace door shell 240, the elastic member 250 is sleeved on the second guide rod 260, and elastically abuts between the insulation door 400 and the furnace door shell 240, and the limiting protrusion 270 can prevent the elastic member 250 from pushing the insulation door 400 out of the second guide rod 260, thereby causing the insulation door 400 to separate from the second guide rod 260.

[0055] When the furnace door 200 is sealed and covered on the port of the furnace drum 100, the thermal insulation door 400 covers the port of the thermal insulation furnace lining 300. At this time, the distance between the thermal insulation door 400 and the furnace door 200 is equal to the first distance, and the distance between the thermal insulation door 400 and the limiting protrusion 270 is greater than zero. If the thermal insulation furnace lining 300 is removed at this time, the thermal insulation door 400 moves in the direction away from the furnace door 200 under the driving action of the elastic force until the thermal insulation door 400 and the limiting protrusion 270 are limited and matched. When the thermal insulation door 400 and the limiting protrusion 270 are limited and matched, the distance between the thermal insulation door 400 and the furnace door 200 is greater than the first distance. It can be understood that when the thermal insulation door 400 and the limiting protrusion 270 are limited and matched, the distance between the thermal insulation door 400 and the furnace door 200 is the initial distance, and is greater than the first distance.

[0056] The thermal insulation door 400 compresses or releases the elastic member 250 so that the thermal insulation door 400 moves on the second guide rod 260 through the second through hole 430. Under the action of external force, the thermal insulation door 400 is driven to compress the elastic member 250, so that the thermal insulation door 400 can move toward the direction of the furnace door 200. In the absence of external force, the elastic member 250 of the thermal insulation door 400 can be driven by the elastic force to move toward the thermal insulation furnace lining 300 until the thermal insulation door 400 is limited and matched with the limiting protrusion 270. Therefore, in the present application, the insulation door 400 is first limited by the limiting protrusion 270, at which time the distance between the insulation door 400 and the furnace door 200 is equal to the initial distance, and then, the insulation door 400 gradually approaches the insulation furnace lining 300 as the furnace door 200 rotates. Under the action of the insulation furnace lining 300, the insulation furnace lining 300 drives the insulation door 400 to move toward the furnace door 200, so that the insulation door 400 avoids the insulation furnace lining 300. At this time, the insulation door 400 is separated from the limiting protrusion 270, and the distance between the insulation door 400 and the furnace door 200 is gradually reduced from the initial distance to the first distance, the insulation door 400 and the insulation furnace lining 300 are adaptively covered, and the furnace door 200 is just sealed and covered on the port of the furnace barrel 100.

[0057] Similarly, during the process of covering the port of the furnace barrel 100 by rotating the furnace door 200, the heat preservation door 400 gradually approaches the heat preservation furnace lining 300 as the furnace door 200 rotates. Even if the heat preservation door 400 touches the heat preservation furnace lining 300 (the situation where the heat preservation door 400 interferes with the heat preservation furnace lining 300), under the action of the heat preservation furnace lining 300, the heat preservation door 400 gradually compresses the elastic member 250, so that the heat preservation door 400 moves towards the furnace door shell 240, thereby enabling the heat preservation door 400 to avoid the heat preservation furnace lining 300, and further enabling the furnace door 200 to continue rotating, so as to prevent the furnace door 200 from being unable to continue rotating due to the interference between the heat preservation door 400 and the heat preservation furnace lining 300, and enabling the furnace door 200 to continue rotating and then cover the port of the furnace barrel 100.

[0058] Meanwhile, even if the heat preservation door 400 has covered the port of the heat preservation furnace lining 300, while the furnace door 200 has not been hermetically covered on the port of the furnace barrel 100, under the action of the heat preservation furnace lining 300, the heat preservation door 400 gradually compresses the elastic member 250, so that the heat preservation door 400 moves towards the furnace door shell 240, thereby enabling the heat preservation door 400 to avoid the heat preservation furnace lining 300, and further enabling the furnace door 200 to continue rotating, so that the furnace door 200 is hermetically covered on the port of the furnace barrel 100, ensuring the sealing performance of the graphite sintering furnace.

[0059] Since the distance between the heat preservation door 400 and the furnace door 200 is greater than the first distance, during the closing process of the furnace door 200, the heat preservation door 400 first covers the port of the heat preservation furnace lining 300, and then the furnace door 200 covers the port of the furnace barrel 100. There is no situation in the prior art where "after the furnace door 200 continues to rotate and covers the port of the furnace barrel 100, the heat preservation door 400 has not yet covered the port of the heat preservation furnace lining 300."

[0060] Since the elastic member 250 elastically abuts between the heat preservation door 400 and the furnace door shell 240, and the elastic member 250 has an elastic force to drive the heat preservation door 400 to move towards the heat preservation furnace lining 300. After the furnace door 200 continues to rotate and covers the port of the furnace barrel 100, even if the heat preservation door 400 has not yet covered the port of the heat preservation furnace lining 300, under the action of the elastic force of the elastic member 250, it drives the heat preservation door 400 to move towards the heat preservation furnace lining 300, so that the heat preservation door 400 covers the port of the heat preservation furnace lining 300, avoiding gaps and preventing the heat in the heat preservation chamber from dissipating through the gaps, ensuring the heat preservation performance of the graphite sintering furnace;

[0061] In order to improve the heat insulation between the heat-insulating door 400 and the heat-insulating furnace lining 300, in an alternative embodiment, the heat-insulating door 400 includes a main body portion 410 and a convex portion 420 protruding from the main body portion 410 towards the heat-insulating furnace lining 300. The main body portion 410 is provided with a second through hole 430. When the furnace door 200 is hermetically closed on the port of the furnace barrel 100, the main body portion 410 covers the port of the heat-insulating furnace lining 300, and the convex portion 420 is located inside the heat-insulating furnace lining 300 and fits against the inner wall of the heat-insulating furnace lining 300. By fitting the convex portion 420 against the inner wall of the heat-insulating furnace lining 300 and covering the port of the heat-insulating furnace lining 300 with the main body portion 410, the covering degree between the heat-insulating door 400 and the port of the heat-insulating furnace lining 300 is improved, so that the heat-insulating door 400 can more comprehensively block the port of the heat-insulating furnace lining 300, avoiding heat loss due to gaps between the two, thereby preventing heat from escaping through the gaps, and thus improving the heat insulation and sealing performance between the heat-insulating door 400 and the port of the heat-insulating furnace lining 300.

[0062] In order to enable the convex portion 420 to smoothly enter and exit the heat-insulating furnace lining 300, optionally, a vacuum sintering furnace with high heat insulation disclosed in the present application may further include a driving member 600 and a sealing member 700. The main body portion 410 is provided with a threaded hole 440, and the furnace door shell 240 is provided with a through hole 280. The sealing member 700 can hermetically cover the through hole 280. One end of the driving member 600 can pass through the through hole 280 and be in threaded cooperation with the threaded hole 440. The driving member 600 is rotationally matched with the through hole 280. When the furnace door 200 is hermetically closed on the port of the furnace barrel 100, the driving member 600 can drive the main body portion 410 to move towards the direction facing the furnace door 200, and the elastic member 250 can drive the main body portion 410 to move towards the direction close to the heat-insulating furnace lining 300.

[0063] During the specific use process, when the furnace door 200 needs to be closed, first remove the seal 700, then install the driving member 600. Drive the body part 410 to move towards the direction close to the furnace door shell 210 through the driving member 600. After moving a certain distance, keep it. Then make the furnace door 200 seal and cover the port of the furnace barrel 100 by rotating. After the furnace door 200 is covered with the furnace barrel 100, slowly release the driving member 600. Under the elastic force of the elastic member 250, drive the body part 410 to move towards the direction close to the heat preservation furnace lining 300, drive the convex part 420 to smoothly enter the heat preservation furnace lining 300, and fit with the inner wall of the heat preservation furnace lining 300. Then remove the driving member 600 and reinstall the seal 700 to ensure the sealing performance during the sintering process. When the furnace door 200 needs to be opened, first remove the seal 700, then install the driving member 600. Drive the body part 410 to move towards the direction close to the furnace door shell 240 through the driving member 600, drive the convex part 420 to smoothly exit the heat preservation furnace lining 300. After moving a certain distance, keep it. Then make the furnace door 200 separate from the furnace barrel 100 by rotating to realize the opening of the furnace door 200. By this way, it can effectively avoid the interference between the convex part 420 and the heat preservation furnace lining 300 during the opening or closing process of the furnace door 200 by rotation, enable the convex part 420 to smoothly enter and exit the heat preservation furnace lining 300, and improve the practicability.

[0064] Meanwhile, during the above process, the heat preservation door 400 covers the port of the heat preservation furnace lining 300 by being perpendicular to the port of the heat preservation furnace lining 300, which can enable the convex part 420 to go straight in and out, avoid the interference between the convex part 420 and the heat preservation furnace lining 300, thus avoiding the hard contact and damage between the two, and further avoiding the damage that will generate impurities such as graphite particles and graphite debris and affect the quality of the sintered product. The threaded hole 440 is a blind hole and does not penetrate the heat preservation door 400 to reduce the influence of the threaded hole 440 on the heat preservation performance of the heat preservation door 400.

[0065] When the vacuum sintering furnace finishes sintering, the heat preservation chamber is usually in a negative pressure state. In order to facilitate the opening of the furnace door 200 and the separation of the heat preservation door 400 from the heat preservation furnace lining 300, when opening the furnace door 200, inert gas can be introduced into the heat preservation chamber through the pipeline in the structure of the vacuum sintering furnace itself to balance the air pressure inside and outside the heat preservation chamber, facilitate the separation of the heat preservation door 400 from the heat preservation furnace lining 300, and facilitate the opening of the furnace door 200.

[0066] As described above, the driving member 600 drives the body portion 410 to move towards the furnace door housing 240. Optionally, the perforation 280 has a limiting step surface 281, and the driving member 600 has a limiting protrusion 610. When one end of the driving member 600 passes through the perforation 280 and is in threaded engagement with the threaded hole 440, the limiting protrusion 610 is in limiting engagement with the limiting step surface 281. When the driving member 600 is rotated, one end of the driving member 600 is screwed into the threaded hole 440. As one end of the driving member 600 is gradually screwed into the threaded hole 440, due to the limiting engagement between the limiting protrusion 610 and the limiting step surface 281, the driving member 600 does not move towards the body portion 410, and only the body portion 410 moves towards the furnace door housing 240 to drive the body portion 410 towards the furnace door 200. This setting method is simple and reliable, easy to set, and the driving is reliable and controllable. Specifically, the driving member 600 can be manually rotated by hand.

[0067] To facilitate manual rotation of the driving member 600 by hand, optionally, a hand-operating portion 620 is provided at one end of the driving member 600 away from the body portion 410. Manually operating the hand-operating portion 620 can rotate the driving member 600 conveniently and labor-savingly.

[0068] As described above, the sealing member 700 can seal and cover the perforation 280. Specifically, a vacuum sintering furnace with high heat insulation disclosed in the present application may further include an elastic sealing ring 800. A first sealing groove 282 is provided at the port of the perforation 280, and a second sealing groove 710 is provided on the sealing member 700. When the sealing member 700 seals and covers the perforation 280, the first sealing groove 282 and the second sealing groove 710 are opposite, and the elastic sealing ring 800 is elastically compressed between the first sealing groove 282 and the second sealing groove 710. By elastically compressing the elastic sealing ring 800, a better sealing effect can be achieved.

[0069] Preferably, the number of the elastic members 250, the second guide rods 260, and the second through holes 430 are all multiple and equal. The elastic members 250, the second guide rods 260, and the second through holes 430 are arranged in one-to-one correspondence and are circumferentially and evenly arranged on the heat preservation door 400 to improve the movement stability of the heat preservation door 400. At the same time, under the abutting action of the multiple elastic members 250, the heat preservation door 400 can be tightly abutted against the port of the heat preservation furnace lining 300 to avoid a small gap between the heat preservation door 400 and the heat preservation furnace lining 300, thereby improving the heat preservation performance.

[0070] Please refer to again Figure 3 and Figure 4, the elastic members 250 are distributed on the outer periphery of the thermal insulation door 400 and are located on the side of the thermal insulation door 400 away from the thermal insulation furnace lining 300. The advantage of such an arrangement is that it is far from the thermal insulation furnace lining 300, that is, far from the high-temperature area of the vacuum sintering furnace, avoiding the influence of the thermal field at high temperature on the elastic members 250, preventing the high temperature from affecting the performance of the elastic members 250, and also enabling the service life of the elastic members 250 to be unaffected, improving the reliability of the equipment.

[0071] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0072] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A vacuum sintering furnace with high heat insulation performance, characterized in that, The invention comprises a furnace drum, a furnace door, an insulating furnace lining, an insulating door and a clamping device, wherein the furnace door is pivotally connected to one side of the furnace drum, the insulating furnace lining is arranged in the furnace drum, the insulating door is elastically connected to one side of the furnace door, and when the furnace door is sealed and covered on the port of the furnace drum, the insulating door elastically abuts against the port of the insulating furnace lining to cover the port of the insulating furnace lining, a first connecting flange is arranged on the outer side of the port of the furnace drum, a second connecting flange is arranged on the outer edge of the furnace door, a plurality of first avoidance grooves are arranged in the array of the second connecting flanges to form a first clamping portion, and the clamping device comprises an annular locking sleeve and a plurality of An elastic top tightening portion, the annular locking sleeve has an annular groove, the two sides of the annular groove are a first flange and a second flange, the first connecting flange is sleeved in the annular groove, the first flange is rotatably matched with the first connecting flange, and the second flange array is provided with a plurality of second avoidance grooves to form a second clamping portion, the elastic top tightening portion is arranged on the inner side of the second clamping portion, the annular locking sleeve can rotate between a first position and a second position, in the first position, the second connecting flange can enter and exit the annular groove, and in the second position, the elastic top tightening portion can abut between the first clamping portion and the second clamping portion; The second engaging portion is provided with a first through hole, the elastic pressing portion comprises a first wedge block, an elastic sleeve and a first guide rod, one end of the first guide rod is connected to the first wedge block, the other end passes through the first through hole, and the first guide rod is guided and matched with the first through hole, the elastic sleeve is sleeved on the first guide rod, and the elastic sleeve is located between the first wedge block and the inner side of the second engaging portion; The furnace door includes a furnace door shell, an elastic member and a second guide rod extending from the furnace door shell toward the thermal insulation furnace lining, and a limiting protrusion is provided at one end of the second guide rod facing away from the furnace door shell, the thermal insulation door is provided with a second through hole, the second guide rod is passed through the second through hole, and the guide sliding fit, the thermal insulation door is located between the limiting protrusion and the furnace door shell, the elastic member is sleeved on the second guide rod, and elastically abuts between the thermal insulation door and the furnace door shell, and when the furnace door seal covers the port of the furnace drum, the thermal insulation door covers the port of the thermal insulation furnace lining, and the distance between the thermal insulation door and the limiting protrusion is greater than zero.

2. The vacuum sintering furnace with high heat insulation performance according to claim 1, characterized in that, An anti-dropping protrusion is arranged at one end of the first guide rod away from the first wedge-shaped block, and the outer diameter of the anti-dropping protrusion is greater than the inner diameter of the first through hole.

3. The vacuum sintering furnace with high heat insulation performance according to claim 2, characterized in that, A second wedge block is disposed on the first engaging portion, and when the annular locking sleeve rotates from the first position to the second position, the elastic pressing portion and the second wedge block abut and engage with each other.

4. The vacuum sintering furnace with high heat insulation performance according to claim 3, characterized in that, In the second position, the first connecting flange fits with the second connecting flange, and an elastic sealing ring is arranged between the two. The surface of the elastic pressing part facing the first clamping part is a smooth coating and is provided with grease.

5. The vacuum sintering furnace with high heat insulation performance according to claim 4, characterized in that, It further includes a driving member and a sealing member. The heat-insulating door includes a main body portion and a convex portion protruding from the main body portion towards the heat-insulating furnace lining. The main body portion is provided with the second through hole, and the main body portion is provided with a threaded hole. The furnace door shell is provided with a perforation. The sealing member can seal and cover the perforation. One end of the driving member can pass through the perforation and be in threaded cooperation with the threaded hole. The driving member is rotationally matched with the perforation. When the furnace door is hermetically covered on the port of the furnace barrel, the main body portion covers the port of the heat-insulating furnace lining. The convex portion is located inside the heat-insulating furnace lining and fits against the inner wall of the heat-insulating furnace lining. The driving member can drive the main body portion to move away from the heat-insulating furnace lining, and the elastic member can drive the main body portion to move towards the heat-insulating furnace lining.

6. The vacuum sintering furnace with high heat insulation performance according to claim 5, characterized in that, The perforation has a limiting step surface, and the driving member has a limiting protrusion. When one end of the driving member passes through the perforation and is in threaded cooperation with the threaded hole, the limiting protrusion is in limiting cooperation with the limiting step surface. When the driving member is rotated, one end of the driving member screws into the threaded hole to drive the main body portion away from the heat-insulating furnace lining.

7. The vacuum sintering furnace with high heat insulation performance according to claim 6, characterized in that, It further includes an elastic sealing ring. A first sealing groove is provided at the port of the perforation, and a second sealing groove is provided on the sealing member. When the sealing member seals and covers the perforation, the first sealing groove and the second sealing groove are opposite to each other, and the elastic sealing ring is elastically compressed between the first sealing groove and the second sealing groove.

8. The vacuum sintering furnace with high heat insulation performance according to claim 7, characterized in that, The number of the elastic members, the second guide rods, and the second through holes is multiple and equal. The elastic members, the second guide rods, and the second through holes are arranged in one-to-one correspondence and are circumferentially and evenly arranged on the heat-insulating door.

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