Search

CN-122015482-A - Continuous sintering furnace

CN122015482ACN 122015482 ACN122015482 ACN 122015482ACN-122015482-A

Abstract

The invention belongs to the technical field of sintering, and particularly relates to a continuous sintering furnace. Including the preparation stove, preparation stove rear side detachable intercommunication has a row of fritting furnace, ageing furnace and a cooling furnace in proper order, the vacuum pump is all installed to preparation stove, cooling furnace and one of them fritting furnace lateral wall, and the gate is all installed to the intercommunication department of two adjacent fritting furnaces, rearmost fritting furnace and ageing furnace's intercommunication department, both sides, ageing furnace and the cooling furnace's of preparing around the stove intercommunication department all are provided with the sealing member, preparation stove, fritting furnace, ageing furnace and cooling furnace are inside all to be equipped with along the conveying roller that the direction of delivery was arranged, the transport frame has been placed on the conveying roller. Through designing the inside casing to the platykurtic structure that the width is greater than the height to arrange the heating rod in both sides, effectively shorten horizontal heat conduction path, make the heat more evenly act on the neodymium iron boron body of short wide stack, show and improve the regional hysteresis problem that heaies up of center, promote sintering uniformity and density.

Inventors

  • LIU HUI
  • ZHENG FANG
  • DONG YONGAN
  • LIN LING
  • ZHANG YU
  • XIE JINGHUA
  • WANG FULE

Assignees

  • 赣南科技学院
  • 江西开源自动化设备有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (9)

  1. 1. A continuous sintering furnace comprises a preparation furnace (1), and is characterized in that the rear side of the preparation furnace (1) is sequentially detachably communicated with a row of sintering furnaces (2), an aging furnace (3) and a cooling furnace (4), vacuum pumps (5) are respectively arranged on the side walls of the preparation furnace (1), the cooling furnace (4) and one of the sintering furnaces (2), gates (6) are respectively arranged at the communication positions of two adjacent sintering furnaces (2), the last sintering furnace (2) and the aging furnace (3), sealing pieces (7) are respectively arranged at the front side and the rear side of the preparation furnace (1), the communication positions of the aging furnace (3) and the cooling furnace (4), conveying rollers (8) arranged along the conveying direction are respectively arranged inside the preparation furnace (1), the sintering furnaces (2), the cooling furnaces (4) and the side walls of one sintering furnaces (2), a mounting frame (201) and an inner frame (203) are respectively connected with the communication positions of the last sintering furnaces (2), the two sealing pieces are respectively arranged between the preparation furnace (1) and the aging furnace (3) and the cooling furnaces (4), sealing pieces (7) are respectively arranged at the communication positions of the preparation furnace (1), the aging furnace (3) and the cooling furnaces (4), the sealing pieces (3) are respectively arranged inside the conveying rollers (8), and the conducting rods (204) are respectively arranged between the sintering furnaces (201) and the conducting rods The heat insulation device comprises a heat insulation layer (202) and an inner frame (203), wherein the inner cavity of the inner frame (203) is of a flat structure with the width larger than the height, heating rods (205) positioned at two sides of the inner frame (203) are installed at the end parts of conducting rods (204), the heating rods (205) are powered by a single-ended introduction mode, the conducting rods (204) are connected to one ends of the heating rods (205), the other ends of the heating rods (205) are electrically connected with a furnace shell of a sintering furnace (2) or an aging furnace (3) to form a power supply loop, bearing assemblies of conveying rollers (8) are arranged outside furnace bodies of the sintering furnace (2) and the aging furnace (3), and the conveying rollers (8) penetrate through the furnace wall through a high-temperature-resistant sealing structure.
  2. 2. A continuous sintering furnace according to claim 1, wherein the inner frame (203) has a ratio of the inner height to the width of 1:2 or less.
  3. 3. A continuous sintering furnace according to claim 1, wherein the sealing member (7) comprises a connecting frame (71), an air cylinder (72), guide rails (73), lifting plates (74), hinge rods (75), sealing doors (76), rollers (77) and fixed blocks (78), the connecting frame (71) is connected to the front side and the rear side of the preparation furnace (1), the communicating position of the aging furnace (3) and the cooling furnace (4), square holes for the conveying frame (80) to pass through are formed in the middle of the connecting frame (71), the air cylinders (72) are connected to the connecting frame (71), a pair of guide rails (73) are connected to the inside of the connecting frame (71), lifting plates (74) positioned in the connecting frame (71) are connected to the movable rods of the air cylinders (72), sealing doors (76) for sealing the square holes are arranged on the rear side of the lifting plates (74), two groups of inclined hinge rods (75) are rotatably connected between the lifting plates (74) and the sealing doors (76), the upper side and the lower side of the lifting plates (75) are rotatably connected to the rolling plates (77) along the pair of the rollers (77) which are rotatably connected to the lifting plates (77) on the two sides, the sealing door is characterized in that two sides of the sealing door (76) are rotatably provided with a roller (77), two sides of the inner wall of the connecting frame (71) are connected with fixed blocks (78), and the roller (77) on the sealing door (76) is located right above the fixed blocks (78).
  4. 4. A continuous sintering furnace according to claim 3, wherein the sealing member (7) further comprises a pressure sensor (79), the pressure sensor (79) is mounted on the side wall of the sealing door (76), and the lifting plate (74) is lowered to be in contact with the pressure sensor (79).
  5. 5. A continuous sintering furnace according to claim 1, wherein the preparation furnace (1), the sintering furnace (2), the aging furnace (3) and the cooling furnace (4) are respectively provided with a protective gas charging port (101), and the bottoms of the preparation furnace (1), the sintering furnace (2), the aging furnace (3) and the cooling furnace (4) are respectively provided with a movable wheel (102).
  6. 6. The continuous sintering furnace according to claim 1, further comprising a heat dissipation mechanism, wherein the heat dissipation mechanism comprises a transverse radiator (41), the transverse radiator (41) is arranged at the lower side of the inner part of the cooling furnace (4), vertical radiators (42) are arranged at two sides of the transverse radiator (41), a fan (43) positioned below the transverse radiator (41) is arranged at the lower part of the cooling furnace (4), two cold air guide plates (44) are arranged in the middle of the inner part of the cooling furnace (4), arc-shaped parts (45) are arranged at the top ends of the cold air guide plates (44), two arc-shaped hot air guide plates (46) are arranged at the inner top of the cooling furnace (4), and side plates (47) are arranged at the rear side of the cooling furnace (4).
  7. 7. The continuous sintering furnace according to claim 6, wherein the heat dissipation mechanism further comprises a lifting door (471), lifting rods (472), synchronizing wheels (473) and a synchronous belt (474), the top of the cooling furnace (4) is provided with the lifting rods (472) driven by hydraulic cylinders, the two ends of each lifting rod (472) are rotatably connected with the synchronizing wheels (473), the rear side of each side plate (47) is provided with the lifting door (471) sliding up and down, two synchronous belts (474) are connected between the lifting door (471) and the top of the cooling furnace (4), and the synchronous belts (474) are wound on the synchronizing wheels (473).
  8. 8. A continuous sintering furnace according to claim 7, wherein the heat dissipation mechanism further comprises a first cooling pipe (475) and a second cooling pipe (476), the first cooling pipe (475) is installed on the side plate (47), the second cooling pipe (476) is installed on the lifting door (471), and the first cooling pipe (475) and the second cooling pipe (476) are distributed in a serpentine shape.
  9. 9. A continuous sintering furnace according to claim 1, further comprising a high-frequency inverter power system electrically connected to the conductive rod (204), wherein the high-frequency inverter power system comprises a rectifying unit, an IGBT inverter unit and a high-frequency transformer, which are sequentially connected, and is used for converting three-phase alternating current into high-frequency alternating current with the frequency of 10KHz to supply power to the heating rod (205).

Description

Continuous sintering furnace Technical Field The invention belongs to the technical field of sintering, and particularly relates to a continuous sintering furnace. Background In the sintering process of the neodymium iron boron permanent magnet material, the uniformity of heating and the thermal efficiency of a sintering furnace directly determine the consistency of the density, microstructure uniformity and final magnetic performance of the product. At present, a conventional sintering furnace is generally provided with heating rods at the upper, lower, left and right sides in a furnace chamber, and neodymium iron boron blanks stacked in the middle of the furnace chamber are heated by outside inward radiation. However, in actual production, the height and width of the green body stack are often similar, the density of the stack is higher, so that obvious thermal resistance exists in the process of transferring heat from outside to inside, the temperature rise in the central area of the stack is delayed, the temperature field is unevenly distributed, and high-efficiency and uniform sintering is difficult to realize. If the stacking height is reduced or the loading capacity is reduced to improve heat conduction, the utilization rate of the furnace cavity space is reduced, the unit energy consumption is increased, and the energy waste is caused. In order to improve the uniformity of a thermal field, part of the existing sintering furnaces adopt a front-back heating structure, and neodymium iron boron stacks are designed to be in a narrow-width high-stack mode with the height-width ratio of about 3:1 so as to shorten a transverse heat conduction path. Although the temperature uniformity is improved to a certain extent by the scheme, the product is damaged and even equipment is failed due to the fact that the center of gravity of the stack is too high and the supporting surface is too narrow, and the stability is poor in the conveying process. To solve this problem, the green body is transported in a hanging manner at the top of the furnace. However, the moving parts of the hanging device are in a sintering environment at high temperature (usually more than 1000 ℃) for a long time, and high-temperature resistant special alloy or ceramic materials are required to be adopted, so that the manufacturing cost is greatly increased, the structure is complex, the maintenance is difficult, and the reliability is limited. In addition, the existing sintering furnace generally adopts a built-in roller way conveying structure, and a support bearing of the built-in roller way conveying structure is directly arranged in the heat preservation layer. Under the continuous high temperature effect, the bearing is easy to have the problems of lubrication failure, thermal deformation, even jamming and the like, the service life is obviously shortened, and meanwhile, the bearing is limited by a narrow space in a furnace, the installation, the replacement and the daily maintenance of the bearing are very inconvenient, and the overall reliability and the maintainability of the equipment are further reduced. Disclosure of Invention In view of this, the present invention provides a continuous sintering furnace. The continuous sintering furnace comprises a preparation furnace, wherein a row of sintering furnaces, an aging furnace and a cooling furnace are detachably communicated with the rear side of the preparation furnace in sequence, vacuum pumps are arranged on the side walls of the preparation furnace, the cooling furnace and one of the sintering furnaces, gates are arranged at the communicated positions of two adjacent sintering furnaces and the communicated positions of the rearmost sintering furnace and the aging furnace, sealing elements are arranged at the front side and the rear side of the preparation furnace and the communicated positions of the aging furnace and the cooling furnace, conveying rollers arranged in the preparation furnace, the sintering furnace, the aging furnace and the cooling furnace in the conveying direction are respectively provided, conveying frames are arranged on the conveying rollers, the interiors of the sintering furnace and the aging furnace are respectively connected with a mounting frame and an inner frame, a multi-layer heat-insulating layer is arranged between the mounting frame and the inner frame, conducting rods are respectively arranged on the sintering furnace and the aging furnace, the conducting rods penetrate through the mounting frames, the heat-insulating layers and the inner frame, the internal cavity structures of the inner frame are of a flat structure with the width larger than the height, the conducting rods are respectively arranged at the front side and the rear side of the preparation furnace, the ageing furnace and the two sides of the cooling furnace and the inner frame are respectively provided with a heating roller arranged in the conveying roller, the heating roller is co