Device for purifying gas for sintering in reducing atmosphere

Abstract

The invention provides a gas purifying device for reducing atmosphere sintering, and relates to the technical field of atmosphere sintering, the gas purifying device comprises a sintering inner container, a purifying device body and a driving assembly, the purifying device body comprises a purifying cover, a lining sealing disc, a vacuum pump and a limiting sealing disc, an air outlet hole is formed in the limiting sealing disc, and an exhaust hole is formed in the top of the purifying cover; two erected net rings are machined on the surface of the top of the lining sealing disc, and a purification layer is arranged between the two erected net rings. The purification cover driven by the driving assembly is arranged at the top of the sintering inner container, so that when a vacuum pump pumps gas in the sintering inner container to the inner side of the purification cover between a lining sealing disc and a limiting ring seat, waste gas can firstly penetrate through the interiors of an erected net ring and a purification layer from the outer side to the inner side; and after the exhaust hole and the gas outlet hole are intermittently communicated, the purified gas is exhausted, and the sintering quality and the sintering efficiency of the target object are conveniently improved in cooperation with the gas which is continuously introduced into the sintering inner container and participates in sintering.

Description

Technical Field

[0001] The present invention relates to the technical field of atmosphere sintering, and specifically to a purification device for the gas used in reducing atmosphere sintering. Background Art

[0002] Atmosphere sintering is for products that are difficult to sinter in air (such as light-transmitting bodies or non-oxides). To prevent their oxidation, a certain amount of a certain gas is introduced into the furnace chamber, and sintering is carried out under this specific atmosphere.

[0003] According to the different natures of the atmosphere, atmosphere sintering techniques can be divided into: oxidation atmosphere sintering, reducing atmosphere sintering, neutral atmosphere sintering, and controlled volatilization atmosphere sintering methods, etc. In inorganic non-metallic raw materials, there are many compounds (such as PbO, SnO 2 , CdO) with relatively high vapor pressures, which means that these compounds will volatilize in large amounts at relatively low temperatures.

[0004] The vacuum atmosphere sintering furnace, as the main working body of atmosphere sintering, can select a suitable atmosphere sintering according to different materials, which helps the sintering process, improves the densification degree of the product, and obtains products with good properties. The commonly used atmospheres in vacuum atmosphere furnaces include vacuum, hydrogen, oxygen, nitrogen, and inert gases (such as argon), etc. For example, transparent alumina ceramics can be sintered in a hydrogen atmosphere, transparent ferroelectric ceramics are suitable for sintering in an oxygen atmosphere, and nitride ceramics such as aluminum nitride are suitable for sintering in a nitrogen atmosphere. Sometimes, it is also necessary to operate in a protective atmosphere to protect the sintering coordination. For example, a molybdenum wire furnace is suitable for passing hydrogen, and a tungsten wire furnace is suitable for working under vacuum conditions.

[0005] A patent document with the patent publication number CN101890293A, a purification device for the gas used in reducing atmosphere sintering, uses a 1000-mesh polyester wire mesh or nylon wire mesh, reducing iron powder with a particle size from microns to microns, and silica gel with a particle size from millimeters to millimeters to form each structural layer in the purification device for the gas used in reducing atmosphere sintering, and the reducing iron powder and silica gel are respectively laid flat between the two wire meshes; the gas enters the device through the air inlet of the polytetrafluoroethylene barrel body, passes through the wire mesh, reducing iron powder, and silica gel in sequence, and finally is discharged from the air outlet, which can realize the purification of the gas used in reducing atmosphere sintering, with a simple structure, low cost, and easy for large-scale production and application.

[0006] However, in the process of implementing the above technical solution, it is found that the above technical solution has the following technical problems: When the existing vacuum atmosphere sintering furnace sinters the target object, since it is necessary to ensure the internal sealed environment, it is not easy to ensure the sintering environment by using this purification device for the gas used in reducing atmosphere sintering, and it is easy for external gas to enter the inside of the sintering furnace, affecting the sintering quality and efficiency of the target object. Summary of the Invention

[0007] In order to overcome the deficiency that when the existing vacuum atmosphere sintering furnace sinters the target object, due to the need to ensure the internal sealed environment, it is not easy to ensure the sintering environment by using the purification device for the gas in the reducing atmosphere sintering, and it is easy for external gas to enter the interior of the sintering furnace, affecting the sintering quality and efficiency of the target object. The embodiment of the present application provides a purification device for the gas in the reducing atmosphere sintering. By setting a purification cover driven by a driving component at the top of the sintering inner liner, when the vacuum pump pumps the gas inside the sintering inner liner between the inner liner sealing disc and the limit ring seat to the inside of the purification cover, the waste gas can first pass through the inside of the erected mesh ring and the purification layer and be purified, and then after the exhaust hole and the air outlet hole are intermittently communicated, the purified gas is discharged. Cooperating with the gas continuously introduced into the sintering inner liner to participate in sintering, it can ensure the sintering environment inside the sintering inner liner and improve the sintering quality and efficiency of the target object.

[0008] The technical solution adopted by the embodiment of the present application to solve its technical problems is: A purification device for the gas in the reducing atmosphere sintering, including a sintering inner liner, a purification device main body and a driving component. The sintering inner liner is assembled inside the atmosphere sintering vacuum furnace, and the purification device main body is arranged at the outer wall of the top of the sintering inner liner; The driving component is arranged inside the purification device main body and is used to drive the purification device main body to rotate on the top of the sintering inner liner; The purification device main body includes a purification cover. The inside of the purification cover is provided with an inner liner sealing disc, and the bottom of the inner liner sealing disc is provided with a vacuum pump. The top of the purification cover is provided with a limit sealing disc, and an air outlet hole is processed inside the limit sealing disc. An exhaust hole is processed on the top of the purification cover; Two erected mesh rings arranged coaxially are processed on the top surface of the inner liner sealing disc, and a purification layer is arranged between the two erected mesh rings; Wherein, the vacuum pump pumps air from inside the sintering inner liner and sends it into the inside of the purification cover through the inner liner sealing disc. After passing through the inside of the purification layer, the driving component controls the purification cover to rotate between the limit sealing disc and the inner liner sealing disc, so that the air outlet hole and the exhaust hole are intermittently communicated, and the gas is discharged.

[0009] In a possible implementation manner, a limit ring seat is processed on the outer wall of the top of the sintering inner liner. A plurality of support legs are processed on the outer side of the bottom of the inner liner sealing disc, and a support column is processed on the top of the inner liner sealing disc. A positioning sleeve is processed at the center of the bottom of the limit sealing disc; The inside of the positioning sleeve is threadedly connected with the support column through a fastening bolt to fix the limit sealing disc and the inner liner sealing disc, and the support legs are assembled to the bottom inner wall of the limit ring seat.

[0010] In a possible implementation, a support sleeve is provided on the outer side of the support column and is processed on the top surface of the inner lining sealing plate. A prism groove is processed inside the support sleeve, and a prism sleeve is processed inside the positioning sleeve; the prism sleeve is slidably connected inside the support sleeve, and the prism sleeve is slidably connected to the outside of the support column.

[0011] In a possible implementation, a spring is sleeved on the outside of the support sleeve, the positioning sleeve is sleeved on the outside of the support sleeve, the spring is located inside the positioning sleeve, and is supported between the inner lining sealing plate and the positioning sleeve.

[0012] In a possible implementation, balls are provided on the bottom inner wall of the limit ring seat, and multiple balls all support the bottom of the purification cover.

[0013] In a possible implementation, the drive assembly includes an air inlet sleeve, and an installation support sleeve is assembled and connected between the top of the air inlet sleeve and the bottom of the inner lining sealing plate; the air extraction port end of the vacuum pump is connected to the inside of the sintering inner tank, and the air outlet port end of the vacuum pump is connected to the bottom of the air inlet sleeve, so that the waste gas enters between the purification cover and the inner lining sealing plate through the air inlet sleeve and the installation support sleeve.

[0014] In a possible implementation, a fan is provided inside the installation support sleeve, a driving gear is provided on the top of the fan, and an internal gear ring is processed on the top side wall of the purification cover; the fan is inside the installation support sleeve and is driven by the flowing gas to drive the driving gear to rotate, and the driving gear and the internal gear ring are engaged to drive the purification cover to rotate on the top of the limit ring seat.

[0015] In a possible implementation, a support shaft rod is connected in a pin-connected manner inside the driving gear, and one end of the support shaft rod is pin-connected to the inside of the fan and passes through the inside of the fan.

[0016] In a possible implementation, a bearing bracket is processed on the bottom inner wall of the installation support sleeve, and a bearing is in interference fit at the center of the top of the bearing bracket; the bearing is in interference fit with the inside of the bottom of the fan, the bottom of the support shaft rod is in interference fit with the inside of the bearing, and one end of the support shaft rod is rotatably connected to the inside of the center of the bearing bracket.

[0017] In a possible implementation, the air outlet holes opened on the limit sealing plate and the exhaust holes opened on the purification cover are both located inside the erected mesh ring. The gas to be treated flows from the periphery to the center inside the purification cover, and after passing through the inside of the purification layer, it is discharged to the outside through the air outlet holes and the exhaust holes in the connected state.

[0018] The beneficial effects of this application are: First, in this solution, by setting a purification cover driven by a driving component at the top of the sintering inner liner, when the vacuum pump pumps the gas inside the sintering inner liner between the inner liner sealing plate and the limit ring seat to the inside of the purification cover, the waste gas can first pass through the inside of the erected mesh ring and the purification layer from the outside to the inside and be purified. Subsequently, after the exhaust hole and the air outlet are intermittently communicated, the purified gas is discharged. Cooperating with the gas continuously introduced into the sintering inner liner to participate in sintering, the sintering environment inside the sintering inner liner can be ensured, and the sintering quality and efficiency of the target object can be improved. Second, in this solution, by sleeving a spring outside the support sleeve, making the spring located inside the positioning sleeve and supported between the inner liner sealing plate and the positioning sleeve, the threaded connection of the fastening bolt and the support column can be adjusted according to the actual situation to control the gap between the surface of the limit sealing plate and the top surface of the purification cover. Third, in this solution, by setting a driving component between the inner liner sealing plate and the limit ring seat, when the vacuum pump extracts waste gas from inside the sintering inner liner and sends the waste gas into the inside of the purification cover through the air inlet sleeve and the installation support sleeve, the waste gas flow can be used to drive the fan to rotate and provide power, so that the driving gear pinned to the top of the support shaft rod rotates. By means of the engagement of the driving gear and the internal gear ring, the purification cover can be driven to rotate on the top of the limit ring seat, which is beneficial to the use of electrical components and reduces costs. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a gas purification device for sintering in a reducing atmosphere according to the present invention; Figure 2 is an external structural diagram of a gas purification device for sintering in a reducing atmosphere according to the present invention; Figure 3 is an exploded view of a gas purification device for sintering in a reducing atmosphere according to the present invention; Figure 4 is a cross-sectional view of the purification cover of a gas purification device for sintering in a reducing atmosphere according to the present invention; Figure 5 is a gas purification device for sintering in a reducing atmosphere according to the present invention Figure 4 The enlarged schematic view of part A in; Figure 6 is a cross-sectional view of the driving component of a gas purification device for sintering in a reducing atmosphere according to the present invention; Figure 7 is a schematic connection structure diagram of the inner liner sealing plate and the limit sealing plate of a gas purification device for sintering in a reducing atmosphere according to the present invention; Figure 8 is a gas purification device for sintering in a reducing atmosphere according to the present invention Figure 7 The enlarged schematic view of part B in.

[0020] Reference Signs: 1. Atmosphere sintering vacuum furnace; 2. Sintering inner liner; 3. Purification device main body; 301. Purification cover; 302. Limit ring seat; 303. Limit sealing plate; 304. Internal gear ring; 305. Inner lining sealing plate; 306. Fastening bolt; 307. Prism sleeve; 308. Positioning sleeve; 309. Support leg; 310. Vacuum pump; 311. Ball; 312. Support column; 313. Support sleeve; 314. Spring; 4. Air outlet; 5. Laying net ring; 6. Purification layer; 7. Exhaust hole; 8. Driving assembly; 801. Driving gear; 802. Installation support sleeve; 803. Air inlet sleeve; 804. Support shaft rod; 805. Fan; 806. Bearing; 807. Bearing bracket; 9. Prism groove. Detailed implementation mode

[0021] The technical solutions in the embodiments of the present application are to solve the problems in the above background technology, and the general idea is as follows: Embodiment 1: This embodiment introduces the specific structure of a purification device for the gas used in reducing atmosphere sintering. Specifically, refer to Figures 1-3 、 Figure 7 and Figure 8 As shown, it includes a sintering inner liner 2 assembled inside the atmosphere sintering vacuum furnace 1, a purification device main body 3 arranged on the outer wall of the top of the sintering inner liner 2, and a driving assembly 8 arranged inside the purification device main body 3 (for driving the purification device main body 3 to rotate on the top of the sintering inner liner 2). The purification device main body 3 includes a purification cover 301. An inner lining sealing plate 305 is arranged inside the purification cover 301. A vacuum pump 310 is arranged at the bottom of the inner lining sealing plate 305. A limit sealing plate 303 is arranged on the top of the purification cover 301. An air outlet 4 is processed inside the limit sealing plate 303. An exhaust hole 7 is processed on the top of the purification cover 301; Two coaxially arranged laying net rings 5 are processed on the top surface of the inner lining sealing plate 305. A purification layer 6 is arranged between the two laying net rings 5; Among them, by making the air outlet 4 opened on the limit sealing plate 303 and the exhaust hole 7 opened on the purification cover 301 both located inside the laying net ring 5, when the vacuum pump 310 pumps air from inside the sintering inner liner 2 and sends it into the inside of the purification cover 301 through the inner lining sealing plate 305, the gas to be treated can flow from the periphery to the center inside the purification cover 301. After passing through the inside of the purification layer 6, the driving assembly 8 controls the purification cover 301 to rotate between the limit sealing plate 303 and the inner lining sealing plate 305, so that the air outlet 4 and the exhaust hole 7 are intermittently communicated, and the gas is discharged (discharged to the outside through the air outlet 4 and the exhaust hole 7 in the communicated state); Secondly, in order to fix the limit sealing plate 303 to the top of the purification cover 301, the limit sealing plate 303 is used to block the top of the purification cover 301, so that the purification cover 301 is stably located between the limit ring seat 302 and the limit sealing plate 303, as Figure 3 , Figure 7 and Figure 8 shown. A limit ring seat 302 is machined on the outer wall of the top of the sintered inner liner 2. A plurality of support legs 309 are machined on the outer side of the bottom of the inner lining sealing plate 305. A support column 312 is machined on the top of the inner lining sealing plate 305. A positioning sleeve 308 is machined at the center of the bottom of the limit sealing plate 303. By passing the fastening bolt 306 through the inside of the positioning sleeve 308 and threadedly connecting it with the support column 312, after the limit sealing plate 303 and the support column 312 are fixed, a relatively closed space for gas purification treatment can be formed between the inside of the limit sealing plate 303, the inner lining sealing plate 305 and the purification cover 301; Meanwhile, by assembling the support legs 309 to the inner wall of the bottom of the limit ring seat 302, the inner lining sealing plate 305 can be fixed to the top of the limit ring seat 302, and the vacuum pump 310 is located between the inner lining sealing plate 305 and the limit ring seat 302; Furthermore, in order to prevent the limit sealing plate 303 from tending to rotate when the purification cover 301 rotates between the limit sealing plate 303 and the inner lining sealing plate 305, causing the connection between the fastening bolt 306 and the support column 312 to become loose, as Figure 7 and Figure 8 shown, a support sleeve 313 is arranged on the outer side of the support column 312 and machined on the top surface of the inner lining sealing plate 305. A prism groove 9 is machined inside the support sleeve 313. A prism sleeve 307 is machined inside the positioning sleeve 308. By slidingly connecting the prism sleeve 307 inside the support sleeve 313 and also slidingly connecting it outside the support column 312, the rotation of the prism sleeve 307 can be restricted by means of the support sleeve 313, ensuring that the limit sealing plate 303 can only move up and down at the top of the purification cover 301; Meanwhile, by sleeving a spring 314 outside the support sleeve 313, the positioning sleeve 308 is sleeved outside the support sleeve 313. The spring 314 is located inside the positioning sleeve 308 and supports between the inner lining sealing plate 305 and the positioning sleeve 308. According to the actual situation, the threaded connection situation between the fastening bolt 306 and the support column 312 can be adjusted, and the spring 314 can be compressed to different degrees, which is beneficial to controlling the gap between the surface of the limit sealing plate 303 and the top surface of the purification cover 301.

[0022] The above design is achieved by arranging a purification cover 301 driven to rotate by a driving assembly 8 at the top of the sintering inner tank 2, and using the inner lining sealing plate 305 inside the purification cover 301 and the limit sealing plate 303 at the top of the purification cover 301 to form a relatively enclosed space inside the purification cover 301. When the vacuum pump 310 pumps the gas inside the sintering inner tank 2 between the inner lining sealing plate 305 and the limit ring seat 302 to the inside of the purification cover 301, the waste gas generated during the atmosphere sintering can first pass through the inside of the erected mesh ring 5 and the purification layer 6 (the waste gas passes from the outside to the inside of the overall structure of the erected mesh ring 5 and the purification layer 6) and be purified (such as the well-known treatment technology in the art). Subsequently, with the purification cover 301 in a rotating state, the exhaust hole 7 is connected to the air outlet hole 4 inside the limit sealing plate 303, and the purified gas can be discharged; Meanwhile, when it is necessary to control the gap between the limit sealing plate 303 and the limit ring seat 302, the threaded connection of the adjusting fastening bolt 306 and the support column 312 is adjusted (at this time, the prism sleeve 307 is slidably connected inside the support sleeve 313 to ensure that the limit sealing plate 303 can only move up and down at the top of the purification cover 301), and the spring 314 is compressed to different degrees, which is beneficial to controlling the gap between the surface of the limit sealing plate 303 and the top surface of the purification cover 301.

[0023] It should be noted that the driving assembly 8 drives the purification cover 301 to rotate between the limit sealing plate 303 and the limit ring seat 302, which can be controlled in the form of cooperation between a motor, gears, and a gear ring; Meanwhile, the sintering of the target object is continuously carried out inside the sintering inner tank 2. During the sintering process, the gas participating in the sintering is continuously introduced into the sintering inner tank 2. After the waste gas is generated, the vacuum pump 310 continuously pumps the gas outwards to ensure the unidirectional flow of the gas, which is beneficial to intermittently discharging the waste gas by means of the continuously input sintering gas, and improving the sintering quality and efficiency of the target object.

[0024] Embodiment 2: Based on Embodiment 1, as Figures 2-7 shown, this embodiment introduces the specific structure of the driving assembly 8. The driving assembly 8 includes an air inlet sleeve 803. An installation support sleeve 802 is assembled and connected between the top of the air inlet sleeve 803 and the bottom of the inner lining sealing plate 305. A fan 805 is arranged inside the installation support sleeve 802. A driving gear 801 is arranged at the top of the fan 805. An internal gear ring 304 is machined at the top side wall of the purification cover 301; As Figure 6 shown, a support shaft rod 804 is pin-connected inside the driving gear 801. A bearing support 807 is machined at the bottom inner wall of the installation support sleeve 802. A bearing 806 is press-fitted at the center of the top of the bearing support 807; Among them, by connecting the air extraction port end of the vacuum pump 310 to the inside of the sintering inner tank 2 and the air outlet end of the vacuum pump 310 to the bottom of the air inlet sleeve 803, the waste gas can enter between the purification cover 301 and the inner lining sealing plate 305 through the air inlet sleeve 803 and the installation support sleeve 802, ensuring that the waste gas is pumped by the vacuum pump 310 to between the limit sealing plate 303, the inner lining sealing plate 305 and the inner wall of the purification cover 301; Secondly, by placing the fan 805 inside the installation support sleeve 802, when one end of the support shaft rod 804 is pinned to the inside of the fan 805 and passes through the inside of the fan 805, the flowing waste gas in the installation support sleeve 802 from the bottom to the top can be utilized to drive the driving gear 801 to rotate. The driving gear 801 and the internal gear ring 304 can be engaged to drive the purification cover 301 to rotate on the top of the limit ring seat 302; At the same time, by press-fitting the bearing 806 to the inside of the bottom of the fan 805, press-fitting the bottom of the support shaft rod 804 to the inside of the bearing 806, and rotatably connecting one end of the support shaft rod 804 to the inside of the center of the bearing bracket 807, during the process of the fan 805 driving the driving gear 801 to rotate synchronously through the support shaft rod 804, the bearing 806 can be utilized to reduce the resistance, and with the cooperation of one end of the support shaft rod 804 and the bearing bracket 807, the support shaft rod 804 can be positioned to limit the swing of the driving gear 801 during rotation; Furthermore, when the fan 805 driven by the waste gas flow drives the support shaft rod 804 to rotate, with the driving gear 801 at one end of the support shaft rod 804 engaged with the internal gear ring 304, the purification cover 301 can be driven to rotate on the top of the limit ring seat 302. At this time, by arranging the balls 311 at the inner wall of the bottom of the limit ring seat 302 and making multiple balls 311 support the bottom of the purification cover 301, the resistance during the rotation of the purification cover 301 can be reduced.

[0025] Through the above design, by arranging the driving assembly 8 between the inner lining sealing plate 305 and the limit ring seat 302, when the vacuum pump 310 extracts waste gas from the inside of the sintering inner tank 2 and sends the waste gas into the inside of the purification cover 301 through the air inlet sleeve 803 and the installation support sleeve 802, the flowing waste gas can be utilized to drive the fan 805 to drive the support shaft rod 804 to rotate. The driving gear 801 at one end of the support shaft rod 804 and the internal gear ring 304 can be engaged to drive the purification cover 301 to rotate on the top of the limit ring seat 302, which is beneficial to saving the use of power components and thus achieving the effect of cost reduction.

[0026] Finally, it should be noted that: Obviously, the above embodiments are merely examples given to clearly illustrate the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A gas purification device for reducing atmosphere sintering, characterized in that: include: A sintering liner (2) mounted inside the atmosphere sintering vacuum furnace (1); A purification device body (3) disposed on the outer wall of the top of the sintered inner tank (2); A driving assembly (8) disposed inside the purification device body (3) and used to drive the purification device body (3) to rotate on the top of the sintered inner container (2); The purification device body (3) comprises a purification hood (301), an inner lining sealing disk (305) is arranged on the inner side of the purification hood (301), a vacuum pump (310) is arranged at the bottom of the inner lining sealing disk (305), a limit sealing disk (303) is arranged on the top of the purification hood (301), an air outlet hole (4) is processed inside the limit sealing disk (303), and an exhaust hole (7) is processed on the top of the purification hood (301); The top surface of the inner liner sealing disk (305) is processed with two coaxially arranged mesh rings (5), and a purification layer (6) is arranged between the two mesh rings (5); The vacuum pump (310) extracts air from the interior of the sintered inner tank (2) and delivers the air through the inner liner sealing disk (305) into the interior of the purification hood (301). After passing through the interior of the purification layer (6), the driving component (8) controls the purification hood (301) to rotate between the limiting sealing disk (303) and the inner liner sealing disk (305), so that the air outlet (4) and the exhaust hole (7) are intermittently connected and the gas is discharged.

2. A reducing atmosphere sintering gas purification device as claimed in claim 1, characterized in that: The top outer wall of the sintered inner liner (2) is processed with a limit ring seat (302), the outer side of the bottom of the liner sealing disk (305) is processed with a plurality of support legs (309), the top of the liner sealing disk (305) is processed with a support column (312), and the center of the bottom of the limit sealing disk (303) is processed with a positioning sleeve (308); The interior of the positioning sleeve (308) is threadedly connected to the support column (312) via a fastening bolt (306) to fix the limiting sealing disk (303) and the lining sealing disk (305), and the supporting leg (309) is assembled to the bottom inner wall of the limiting ring seat (302).

3. A reducing atmosphere sintering gas purification device as claimed in claim 2, characterized in that: The outer side of the support column (312) is provided with a support sleeve (313) processed on the top surface of the liner sealing disk (305); the interior of the support sleeve (313) is processed with a prism groove (9); and the interior of the positioning sleeve (308) is processed with a prism sleeve (307); The prism sleeve (307) is slidably connected to the inside of the support sleeve (313), and the prism sleeve (307) is slidably connected to the outside of the support column (312).

4. A reducing atmosphere sintering gas purification device as claimed in claim 3, characterized in that: The outside of the support sleeve (313) is sleeved with a spring (314), the positioning sleeve (308) is sleeved on the outside of the support sleeve (313), the spring (314) is located on the inner side of the positioning sleeve (308), and is supported between the liner sealing disk (305) and the positioning sleeve (308).

5. A reducing atmosphere sintering gas purification device as claimed in claim 2, characterized in that: A ball bearing (311) is provided on the inner wall of the bottom of the limiting ring seat (302), and a plurality of the ball bearings (311) are supported on the bottom of the purification cover (301).

6. The reducing atmosphere sintering gas purification device according to claim 1, characterized in that: The driving assembly (8) comprises an air inlet sleeve (803), and a mounting support sleeve (802) is assembled and connected between the top of the air inlet sleeve (803) and the bottom of the liner sealing disk (305); The air inlet end of the vacuum pump (310) is connected to the interior of the sintered inner liner (2), and the air outlet end of the vacuum pump (310) is connected to the bottom of the air inlet sleeve (803), so that the exhaust gas enters between the purification cover (301) and the liner sealing disk (305) through the air inlet sleeve (803) and the mounting support sleeve (802).

7. A reducing atmosphere sintering gas purification device as claimed in claim 6, characterized in that: A fan (805) is arranged on the inner side of the mounting support sleeve (802), a driving gear (801) is arranged on the top of the fan (805), and an inner gear ring (304) is processed on the top side wall of the purification cover (301); The fan (805) is installed on the inner side of the mounting support sleeve (802), and is driven by the flowing gas to drive the driving gear (801) to rotate. The driving gear (801) and the inner gear ring (304) are meshed to drive the purification cover (301) to rotate on the top of the limiting ring seat (302).

8. A reducing atmosphere sintering gas purification device as claimed in claim 7, characterized in that: The driving gear (801) is internally pin-connected with a supporting shaft (804), and one end of the supporting shaft (804) is pin-connected to the inside of the fan (805) and passes through the inside of the fan (805).

9. A reducing atmosphere sintering gas purification device as claimed in claim 8, characterized in that: A bearing bracket (807) is processed on the inner wall of the bottom of the mounting support sleeve (802), and a bearing (806) is interference-fitted at the center of the top of the bearing bracket (807); The bearing (806) is interference-fitted to the inner side of the bottom of the fan (805), the bottom of the support shaft (804) is interference-fitted to the inner side of the bearing (806), and one end of the support shaft (804) is rotatably connected to the inner side of the center of the supporting bracket (807).

10. The reducing atmosphere sintering gas purification device according to claim 1, characterized in that: The gas outlet (4) provided on the limiting sealing disk (303) and the exhaust hole (7) provided on the purification hood (301) are both located on the inner side of the mesh ring (5), and the gas to be treated flows from the surroundings of the inner side of the purification hood (301) toward the center, and after passing through the interior of the purification layer (6), is discharged to the outside through the gas outlet (4) and the exhaust hole (7) in a connected state.

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