CN213335565U

CN213335565U - Continuous vacuum sintering furnace

Info

Publication number: CN213335565U
Application number: CN202022342298.8U
Authority: CN
Inventors: 董永安
Original assignee: Taiyuan Kaiyuan Intelligent Equipment Co ltd
Current assignee: Taiyuan Kaiyuan Intelligent Equipment Co ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-06-01
Anticipated expiration: 2030-10-20

Abstract

The utility model relates to a vacuum sintering furnace specifically is a continuous type vacuum sintering furnace. The problems that heating sections of a sintering chamber of an existing continuous vacuum sintering furnace are not separated, and a gate valve is high in cost and complex in operation are solved. A continuous vacuum sintering furnace comprises a vacuum transition chamber, a sintering chamber and a cooling chamber, wherein the sintering chamber adopts a multi-section heating structure, a tray is arranged in each heating section of the sintering chamber, a material box is arranged on each tray, and the length of each tray is the same as that of each heating section; plugs perpendicular to the tray are arranged at two ends of the tray, the plugs are of a shutter structure, the direction of shutter blades of the plugs at the feeding side of the sintering chamber of the tray is opposite to that of the shutter blades of the plugs at the discharging side of the sintering chamber, and the edges of the plugs at the two ends of the tray are in airtight contact with the inner wall of the sintering chamber. The utility model is suitable for a shaping and sintering of neodymium iron boron, samarium cobalt magnetic material also can be used to other fields such as pottery, powder metallurgy.

Description

Continuous vacuum sintering furnace

Technical Field

The utility model relates to a fritting furnace, especially vacuum fritting furnace specifically are a continuous type vacuum fritting furnace.

Background

Chinese patent application No. 201811413657.5 discloses an external heat type vacuum continuous sintering furnace, which comprises a vacuum transition chamber, an external heat type sintering chamber and a cooling chamber, wherein one end of the vacuum transition chamber and one end of the cooling chamber are respectively connected with two ends of the external heat type sintering chamber through isolation valves (gate valves), the vacuum transition chamber, the external heat type sintering chamber and the cooling chamber are respectively formed into independent spaces through the isolation valves, the other ends of the vacuum transition chamber and the cooling chamber are also provided with the isolation valves, and the vacuum transition chamber, the external heat type sintering chamber and the cooling chamber are all communicated with a vacuum unit; outer hot type sintering chamber adopts multistage formula heating structure (can reach 20 heating sections as required, and the sintering effect is guaranteed to the temperature independent control of every heating section), be equipped with transition room conveying mechanism in the vacuum transition chamber, be equipped with cooling chamber conveying mechanism in the cooling chamber, have a tray in every heating section of outer hot type sintering chamber, have the magazine on the tray, tray length is the same with heating section length, and like this, the tray head and the tail in every heating section meets, guarantees that the magazine on every tray sinters in the heating section of different temperatures in proper order, is equipped with the sintering support in the outer hot type sintering chamber, and the tray can slide on the sintering support. When in work, the isolation valve at one end of the vacuum transition chamber is firstly opened, the tray (one) on which the material box is placed is sent to the transition chamber conveying mechanism, and the isolation valve is closed, then opening isolation valves (gate valves) between the vacuum transition chamber and the external heating type sintering chamber and between the cooling chamber and the external heating type sintering chamber, the tray with the material box thereon is sent into the external heating type sintering chamber through the transition chamber conveying mechanism, all trays in the external heating type sintering chamber are pushed to move, namely, the sintered tray (one) with the material box is jacked to a cooling chamber conveying mechanism, the isolation valves between the vacuum transition chamber and the external thermal sintering chamber and between the cooling chamber and the external thermal sintering chamber are closed, after the material box is cooled in the cooling chamber, the isolation valve at one end of the cooling chamber is opened, the cooled tray with the cartridges thereon is removed from the cooling chamber by a cooling chamber transfer mechanism and the isolation valve is closed. The specific operation can be carried out according to the rhythm of feeding one tray per hour.

The external heating type vacuum continuous sintering furnace has the following defects: the heating sections are not separated, and the temperature of each heating section is difficult to accurately control; meanwhile, organic matter molecules such as lubricant, forming agent, release agent and the like overflowing when the sintered object in the material box is heated in the low-temperature heating section can flow upwards in a reverse direction (the vacuum pump is connected at the cold end) and run to the high-temperature heating section to pollute the product being sintered in the high-temperature heating section, so that the quality of the product is reduced, and even the product is scrapped. In order to overcome the defect, the conventional continuous vacuum sintering furnace is additionally provided with a gate valve between heating sections, but the cost of the gate valve is too high and the operation is complex.

Disclosure of Invention

The utility model provides a do not cut off between each heating section of sintering chamber of current continuous type vacuum sintering stove, and adopt the problem that the high operation of push-pull valve is complicated, provide a continuous type vacuum sintering stove. The continuous vacuum sintering furnace not only realizes the heat separation between heating sections of the sintering chamber, but also solves the problems of high cost and complex operation of a gate valve through ingenious structural improvement.

The utility model discloses an adopt following technical scheme to realize: a continuous vacuum sintering furnace comprises a vacuum transition chamber, a sintering chamber and a cooling chamber, wherein the sintering chamber adopts a multi-section heating structure, a tray is arranged in each heating section of the sintering chamber, a material box is arranged on each tray, and the length of each tray is the same as that of each heating section; the tray both ends are equipped with the end cap perpendicular with the tray, the end cap is the shutter structure, and the shutter blade direction of the sintering room feed side end cap of tray is opposite with the shutter blade direction of sintering room discharge side end cap (for example, the shutter blade direction of sintering room feed side end cap is the horizontal direction, and the shutter blade direction of sintering room discharge side end cap just is the vertical direction), and the edge of the end cap at tray both ends and the airtight contact of sintering room inner wall. Because the length of the tray is the same as that of the heating sections, the tray in each heating section is connected end to end, and thus, double rows of louvers with different angles are arranged on the interface of the adjacent heating sections, so that radiant heat is blocked, mutual heat interference of the adjacent heating sections is avoided, accurate temperature control of each heating section is realized, airflow can smoothly pass through the heating section, and establishment and maintenance of a vacuum environment in the sintering furnace are not influenced.

The utility model avoids the mutual heat interference of adjacent heating sections by arranging the plugs of the shutter structure at the two ends of the tray, thereby being beneficial to the accurate control of the temperature of each heating section; meanwhile, as a gate valve is omitted, the material transfer structure is simplified, the cost is greatly reduced, the operation is simplified, and the operation reliability is improved. The utility model is suitable for a shaping and sintering of neodymium iron boron, samarium cobalt magnetic material also can be used to other fields such as pottery, powder metallurgy.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic view of a tray with plugs at both ends and a magazine thereon;

FIG. 4 is an enlarged view of the chamber segment structure of the sintering chamber;

FIG. 5 is a schematic view of a door structure of a cooling chamber;

FIG. 6 is a schematic view of the structure of the oven door of the vacuum transition chamber.

In the figure: 1-vacuum transition chamber, 1-1-transition chamber furnace door, 1-2-feeding moving vehicle, 1-3-feeding support, 2-sintering chamber, 2-1-natural cooling chamber section, 2-2-aging treatment chamber section, 3-cooling chamber, 3-1-cooling chamber furnace door, 3-2-discharging moving vehicle, 3-3-discharging support, 4-tray, 5-material box, 6-plug, 7-heat insulation wall and 8-inert gas input pipe mouth.

Detailed Description

A continuous vacuum sintering furnace comprises a vacuum transition chamber 1, a sintering chamber 2 and a cooling chamber 3, wherein the sintering chamber 2 adopts a multi-section heating structure, a tray 4 is arranged in each heating section of the sintering chamber 2, a material box 5 is arranged on each tray 4, and the length of each tray 4 is the same as that of each heating section; plugs 6 perpendicular to the tray 4 are arranged at two ends of the tray 4, the plugs 6 are of a shutter structure, the direction of shutter blades of the plugs at the feeding side of the sintering chamber of the tray 4 is opposite to that of the shutter blades of the plugs at the discharging side of the sintering chamber, and the edges of the plugs 6 at two ends of the tray 4 are in airtight contact with the inner wall of the sintering chamber 2. In specific implementation, an annular heat insulation wall 7 is arranged at the interface of adjacent heating sections in the sintering chamber 2, the outer ring of the heat insulation wall 7 is hermetically fixed with the inner wall of the sintering chamber 2, and the edges of the plugs 6 at the two ends of the tray 4 are hermetically contacted with the inner ring of the heat insulation wall 7; the heat interference between the adjacent heating sections can be further blocked by adding the heat insulation wall 7. The sintering chamber 2 is formed by butting a plurality of chamber sections with the same length and diameter, and each chamber section is a heating section, so that the processing and the manufacturing of the sintering chamber are convenient. The second chamber section from the discharge side of the sintering chamber 2 is a natural cooling chamber section 2-1 with a heat exchanger inside, and the first chamber section from the discharge side is an aging treatment chamber section 2-2, so that the integration of aging treatment equipment (furnace) and a continuous vacuum sintering furnace is realized, the aging treatment is realized while the sintering is finished, and the functions of the continuous vacuum sintering furnace are increased. Specifically, the sintering chamber 2 is formed by connecting nine chamber sections, and the 300-degree chamber section, the 400-degree chamber section, the 500-degree chamber section with 800 degrees, the 800-degree chamber section with 800 degrees, the 1050-degree chamber section with 800 degrees, the natural cooling chamber section 2-1 and the aging treatment chamber section 2-2 are arranged in sequence from the feeding side to the discharging side. An inert gas input pipe orifice 8 is arranged on the natural cooling chamber section 2-1, and inert gas (argon) is filled from the inert gas input pipe orifice 8 during sintering to prevent impurity gas volatilized by the sintered objects from polluting the sintered objects in the high-temperature region; meanwhile, the inert gas with certain pressure realizes current-carrying sintering, increases heat convection, improves temperature uniformity and heat conduction speed, is beneficial to improving product uniformity and performance and shortens sintering time; the inert gas is introduced from the natural cooling chamber section 2-1, thereby cooling the sintered body with high temperature and preheating the inert gas.

The sintering chamber 2 adopts an internal heating structure; the external heating structure can only sinter products below 1050 ℃, and the heat-resistant steel in the current market can only reliably work at the temperature, so that the external heating structure limits the increase of the sintering temperature, and the internal heating structure is more beneficial to the increase of the sintering temperature and the increase of the diameter of an inner cavity of a sintering chamber.

A cooling chamber furnace door 3-1 is arranged at the end of the cooling chamber 3 not connected with the sintering chamber, a discharging moving vehicle 3-2 is arranged below the cooling chamber furnace door 3-1, and a discharging bracket 3-3 extending into the cooling chamber 3 is fixed on the cooling chamber furnace door 3-1. The discharging moving vehicle 3-2 is pushed to close the cooling chamber furnace door 3-1 on the cooling chamber 3, and the discharging support 3-3 extends into the cooling chamber 3; during discharging, the discharging support 3-3 is used for bearing the sintered tray with the material box thereon, and the sintered material box can be dismounted by pulling out the discharging moving vehicle 3-2. Similarly, a transition chamber furnace door 1-1 is arranged at the end, not connected with the sintering chamber, of the vacuum transition chamber 1, a feeding moving vehicle 1-2 is arranged below the transition chamber furnace door 1-1, and a feeding support 1-3 extending into the vacuum transition chamber 1 is fixed on the transition chamber furnace door 1-1. The transition chamber furnace door 1-1 can be closed on the vacuum transition chamber 1 by pushing the feeding moving vehicle 1-2, meanwhile, the feeding support 1-3 extends into the vacuum transition chamber 1, a tray with a material box is placed on the feeding support 1-3, and the material box is filled with the to-be-sintered material. The furnace door structure is used for replacing a gate valve at the end, not connected with the sintering chamber, of a vacuum transition chamber and a cooling chamber of the conventional continuous vacuum sintering furnace, so that the cost is further reduced, and the operation is convenient.

Claims

1. A continuous vacuum sintering furnace comprises a vacuum transition chamber (1), a sintering chamber (2) and a cooling chamber (3), wherein the sintering chamber (2) adopts a multi-section heating structure, a tray (4) is arranged in each heating section of the sintering chamber (2), a material box (5) is arranged on each tray (4), and the length of each tray (4) is the same as that of each heating section; the device is characterized in that plugs (6) perpendicular to the tray (4) are arranged at two ends of the tray (4), the plugs (6) are of a shutter structure, the direction of shutter blades of the plugs at the feeding side of the sintering chamber of the tray (4) is opposite to that of the shutter blades of the plugs at the discharging side of the sintering chamber, and the edges of the plugs (6) at two ends of the tray (4) are in airtight contact with the inner wall of the sintering chamber (2).

2. A continuous vacuum sintering furnace according to claim 1, characterized in that an annular heat insulating wall (7) is arranged at the interface of adjacent heating sections in the sintering chamber (2), the outer ring of the heat insulating wall (7) is hermetically fixed with the inner wall of the sintering chamber (2), and the edges of the plugs (6) at both ends of the tray (4) are hermetically contacted with the inner ring of the heat insulating wall (7).

3. A continuous vacuum sintering furnace according to claim 2, characterized in that the sintering chamber (2) is formed by a plurality of chamber sections of the same length and diameter, each chamber section being a heating section.

4. A continuous vacuum sintering furnace according to claim 3, characterized in that the second chamber section from the discharge side of the sintering chamber (2) is a natural cooling chamber section (2-1) with a heat exchanger inside and the first chamber section from the discharge side is an ageing treatment chamber section (2-2).

5. The continuous vacuum sintering furnace as claimed in claim 4, characterized in that the sintering chamber (2) is formed by connecting nine chamber sections, which are a 300 degree chamber section, a 400 degree chamber section, a 500-800 degree chamber section, a 800-950 degree chamber section, three 1050 degree chamber sections, a natural cooling chamber section (2-1) and an aging treatment chamber section (2-2) in sequence from the feeding side to the discharging side.

6. A continuous vacuum sintering furnace according to claim 4 or 5 characterized in that the natural cooling chamber section (2-1) is provided with inert gas inlet nozzles (8).

7. A continuous vacuum sintering furnace according to claim 6 characterized in that the sintering chamber (2) is of internal heat type.

8. The continuous vacuum sintering furnace according to claim 7, characterized in that the end of the cooling chamber (3) not connected with the sintering chamber is provided with a cooling chamber furnace door (3-1), a discharging moving vehicle (3-2) is arranged below the cooling chamber furnace door (3-1), and a discharging bracket (3-3) extending into the cooling chamber (3) is fixed on the cooling chamber furnace door (3-1); a transition chamber furnace door (1-1) is arranged at the end, not connected with the sintering chamber, of the vacuum transition chamber (1), a feeding moving vehicle (1-2) is arranged below the transition chamber furnace door (1-1), and a feeding support (1-3) extending into the vacuum transition chamber (1) is fixed on the transition chamber furnace door (1-1).