Sintering furnace for laboratory

Abstract

The utility model discloses a sintering furnace for a laboratory, which comprises a furnace body frame, a frame plate fixedly mounted at the top of the furnace body frame, a sintering furnace body fixedly mounted at the top of the frame plate, and a storage rack for lifting and feeding between the frame plate and the furnace body frame, two sets of worm and gear lifters for driving the storage rack to ascend and descend are fixedly installed in the furnace body frame, ceramic fiber heat insulation layers are arranged on the outer wall of the sintering furnace body and the top of the storage rack, and three sets of air cooling mechanisms are fixedly installed on the top of the frame plate. The air cooling mechanism comprises an air blower fixedly installed at the top of the frame plate and a cooling end penetrating through the sintering furnace body, a hot air pipe is arranged at the top of the sintering furnace body, and a hot air exhaust port penetrating through the sintering furnace body is formed in the hot air pipe. According to the arrangement of the three sets of air cooling mechanisms and the cooling end, surrounding type cooling of the interior of the sintering furnace body is guaranteed, and a certain uniform cooling effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of sintering furnace technology, specifically relating to a laboratory sintering furnace. Background Technology

[0002] Alumina ceramics possess properties such as high hardness, high temperature resistance, and good insulation, and are widely used in electronics, machinery, chemical, and medical fields. They can be used to make refractory bricks, electronic substrates, and abrasive materials. The production process mainly includes raw material processing, molding, and sintering. It is stable in air sintering, and the required sintering temperature is 1500℃~1700℃.

[0003] Domestic invention patent application number 202411890360.3 discloses a cooling structure for a sintering furnace, relating to the field of sintering furnace technology. It solves the problems of long cooling times and limited efficiency in existing sintering furnace cooling structures. Furthermore, it addresses the technical issues of high energy consumption and insufficient waste heat utilization efficiency in sintering furnaces. The structure includes a shell mounted on the sintering furnace body, divided into three chambers: chamber one, an intermediate body, and chamber two. Chamber one contains rotating turbine blades, with cooling ducts connected to the turbine exhaust port. The other ends of the cooling ducts are connected to the sintering furnace body. Chamber two contains a compressor impeller connected to the turbine blades via a linkage shaft. The compressor impeller draws in gas synchronously with the turbine blades. This invention combines circulating water cooling and air cooling technologies, achieving both uniform and rapid sample cooling, significantly reducing the cooling time and thus significantly improving the overall cooling efficiency. In the aforementioned invention patent, the cooling air ducts are installed around the furnace body, which cannot guarantee uniform cooling of the internal materials. When alumina ceramics are actually sintered and cooled, the temperature difference between different parts is too large, which will generate local thermal stress. When the stress exceeds the tensile strength of the material, it will directly cause cracks, affecting the reliability and yield of the product. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a laboratory sintering furnace, including a furnace frame, a shelf plate fixedly installed on the top of the furnace frame, a sintering furnace body fixedly installed on the top of the shelf plate, and a storage rack for lifting and loading materials between the shelf plate and the furnace frame. Two sets of worm gear lifts for driving the storage rack to rise and fall are fixedly installed inside the furnace frame. The outer wall of the sintering furnace body and the top of the storage rack are both ceramic fiber insulation layers. Three sets of air-cooling mechanisms are fixedly installed on the top of the shelf plate, and each air-cooling mechanism includes a blower fixedly installed on the top of the shelf plate and a cooling end penetrating the sintering furnace body. A hot air pipe is provided on the top of the sintering furnace body, and a hot air exhaust port penetrating the sintering furnace body is opened in the hot air pipe.

[0005] The sintered material inside the sintering furnace is cooled by an air-cooling system.

[0006] As a further preferred technical solution of this utility model, the air-cooling mechanism also includes two sets of conveying pipes installed against the outer wall of the sintering furnace and a connecting pipe connecting the blower and the conveying pipes. The cooling end is in three sets and is installed at different heights on the conveying pipes. An exhaust solenoid valve is installed on the connecting pipe.

[0007] Based on the configuration of the three sets of air-cooling mechanisms and the cooling end, the internal cooling of the sintering furnace body is ensured to be circumferential and have a certain uniform cooling effect. The three sets of fans can be connected to a variable frequency motor to control the wind speed and air volume, thereby ensuring the uniformity of air cooling.

[0008] As a further preferred technical solution of this utility model; an acceleration channel is provided at one end of the cooling end, and a flow guide nozzle is installed inside the sintering furnace body at one end of the cooling end. The flow guide nozzle is installed to the inner wall of the cooling end through an installation ring. The flow guide nozzle is provided with multiple sets of flow guide curved surfaces with different orientations, and multiple sets of flow guide ports are opened on the flow guide nozzle.

[0009] When the confined fluid passes through the narrowed flow cross-section, the air introduced into the sintering furnace from the cooling end increases its velocity as it passes through the acceleration channel. This allows the air to be quickly discharged into the sintering furnace cavity for cooling through the guide surface and guide port on the guide nozzle. The air discharged from the guide surface and guide port has different positions and distances, forming a dispersed discharge. This avoids direct cooling of the material from the cooling end by spraying it out in a straight line, while increasing the area of ​​air cooling and thus improving the uniformity of cooling the material.

[0010] As a further preferred technical solution of this utility model, oil cylinders are fixedly installed on both sides of the hot air outlet at the top of the sintering furnace body, a set of lifting frames are fixedly installed between the tops of the oil cylinders, and a piston block that cooperates with the hot air outlet is fixedly installed at the bottom of the lifting frame.

[0011] During the sintering process, the piston block blocks the hot air outlet to close it, thus preventing heat loss from the sintering furnace cavity.

[0012] As a further preferred technical solution of this utility model, a graphite heating field for sintering is fixedly installed inside the sintering furnace body, and the top of the graphite heating field is fixedly installed to the sintering furnace body through a mounting bracket.

[0013] The furnace cavity inside the sintering furnace is heated by a graphite heating field, thereby sintering the materials placed on the rack.

[0014] As a further preferred technical solution of this utility model; the shelf holds material parts, the top of the furnace frame is fixedly installed to the bottom of the frame plate by four sets of pillars, the bottom of the frame plate is fixedly installed with four sets of guide columns, and a lifting plate is welded to the bottom of the shelf, and the lifting plate is set through the guide columns.

[0015] During the lifting plate's auxiliary loading and sintering process, the lifting plate is guided by guide columns to ensure stable loading.

[0016] As a further preferred technical solution of this utility model; a reducer is fixedly installed on the furnace frame, and a transmission shaft is synchronously fixedly installed on the furnace frame at one end of the reducer; a synchronous screw is installed at the top of the worm gear jack, passing through the furnace frame and the frame plate; the worm gear jack passes through the transmission shaft and drives the synchronous screw to rotate through the transmission shaft; two sets of guide nuts with threads passing through the synchronous screw are installed on the lifting plate.

[0017] The drive shaft is driven by a reducer to slowly rotate the worm gear jack and the synchronous screw to raise and lower the lifting plate. The worm gear jack has a self-locking structure to prevent the shelf from falling in the event of a power outage.

[0018] Beneficial effects

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. When the confined fluid passes through the narrowed flow cross section, the air introduced into the sintering furnace from the cooling end increases its velocity as it passes through the acceleration channel. This allows the air to be quickly discharged into the sintering furnace cavity for cooling through the guide surface and guide port on the guide nozzle. The air discharged from the guide surface and guide port has different positions and distances, forming a dispersed discharge. This avoids direct cooling of the material by spraying it directly from the cooling end at a straight distance, while increasing the area of ​​air cooling and thus improving the uniformity of cooling the material.

[0021] 2. Based on the configuration of the three sets of air-cooling mechanisms and the cooling end, the internal cooling of the sintering furnace body is ensured to be circumferential and have a certain uniform cooling effect. The three sets of fans can be connected to a variable frequency motor to control the wind speed and air volume, thereby ensuring the uniformity of air cooling. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 3This is a top view of the structure of this utility model;

[0025] Figure 4 This is a cross-sectional structural diagram of the cooling end position of this utility model;

[0026] Figure 5 for Figure 4 A magnified structural diagram of point A in the middle.

[0027] In the diagram: 1. Furnace frame; 11. Support column; 2. Frame plate; 21. Guide column; 22. Guide nut; 3. Sintering furnace body; 31. Hot air outlet; 32. Material component; 33. Shelf; 34. Lifting plate; 35. Hot air duct; 36. Ceramic fiber insulation layer; 4. Graphite heating field; 41. Mounting frame; 5. Air cooling mechanism; 51. Blower; 52. Connecting pipe; 53. Conveying pipe; 54. Cooling end; 541. Acceleration channel; 542. Guide nozzle; 543. Guide surface; 544. Guide port; 545. Mounting ring; 55. Exhaust solenoid valve; 6. Hydraulic cylinder; 61. Lifting frame; 62. Piston block; 7. Reducer; 71. Drive shaft; 72. Worm gear jack; 73. Synchronous screw. Detailed Implementation

[0028] This specific embodiment is a laboratory sintering furnace.

[0029] In the aforementioned invention patent, the cooling air ducts are installed around the furnace body, which cannot guarantee uniform cooling of the internal materials. When alumina ceramics are actually sintered and cooled, the temperature difference between different parts is too large, which will generate local thermal stress. When the stress exceeds the tensile strength of the material, it will directly cause cracks, affecting the reliability and yield of the product.

[0030] Its structural diagram is as follows Figures 1-5As shown. A laboratory sintering furnace includes a furnace frame 1, a frame plate 2 fixedly installed on the top of the furnace frame 1, a sintering furnace body 3 fixedly installed on the top of the frame plate 2, and a lifting rack 33 for loading materials between the frame plate 2 and the furnace frame 1. The top of the furnace frame 1 is fixedly installed to the bottom of the frame plate 2 via four sets of support columns 11. Four sets of guide columns 21 are fixedly installed at the bottom of the frame plate 2. A lifting plate 34 is welded to the bottom of the lifting rack 33, and the lifting plate 34 passes through the guide columns 21. During the process of lifting the lifting plate 34 to assist the loading and sintering of the loading rack 33, the guide columns 21 guide the lifting plate 34 to ensure stable loading. Two sets of worm gear lifts 72 for driving the lifting of the loading rack 33 are fixedly installed inside the furnace frame 1. A reducer 7 is fixedly installed on the furnace frame 1, and a drive shaft 71 is synchronously fixedly installed on the furnace frame 1 at one end of the reducer 7. A worm gear lift 72 is installed at the top through the space between the furnace frame 1 and the frame plate 2, and a synchronous screw 73 is installed. The worm gear lift 72 passes through the drive shaft 71 and drives the synchronous screw 73 to rotate. Two sets of guide nuts 22 with threads passing through the synchronous screw 73 are installed on the lifting plate 34.

[0031] Sintering furnaces are divided into internal heating and external heating types. The internal heating type has a carbon material inside the tank, which cannot come into contact with oxygen and can only be sintered in a vacuum or other atmospheres. It is not suitable for sintering alumina ceramics. The external heating type has an internal tank, but the temperature resistance of the tank is limited, with a maximum of 800℃ to 1000℃. However, the sintering temperature of alumina ceramics requires 1500℃ to 1700℃, so the tank is eliminated. Since the alumina ceramics to be sintered are cylindrical and have a large volume, they can be placed directly on the shelf 33 for sintering. The shelf 33 holds material parts 32, which are alumina ceramics. The outer wall of the sintering furnace body 3 and the top of the shelf 33 are both ceramic fiber insulation layers 36.

[0032] Three sets of air-cooling mechanisms 5 are fixedly installed on the top of the frame plate 2. Each air-cooling mechanism 5 includes a blower 51 fixedly installed on the top of the frame plate 2 and a cooling end 54 penetrating the sintering furnace body 3. A hot air pipe 35 is provided on the top of the sintering furnace body 3, and a hot air outlet 31 penetrating the sintering furnace body 3 is opened within the hot air pipe 35. The volume of hot air is greater than the volume of cold air, therefore the diameter of the hot air outlet 31 is larger than the sum of the diameters of all cooling ends 54. Hydraulic cylinders 6 are fixedly installed on both sides of the hot air outlet 31 at the top of the sintering furnace body 3. A set of lifting frames 61 is fixedly installed between the tops of the hydraulic cylinders 6, and a piston block 62 that cooperates with the hot air outlet 31 is fixedly installed at the bottom of the lifting frame 61. A ceramic fiber insulation layer 36 is also provided at the installation positions of the lifting frame 61 and the piston block 62. During the sintering process, the piston block 62 blocks the hot air outlet 31, closing it to prevent heat loss from the sintering cavity of the sintering furnace body 3.

[0033] The air-cooling mechanism 5 also includes two sets of conveying pipes 53 installed against the outer wall of the sintering furnace body 3, and a connecting pipe 52 connecting the blower 51 and the conveying pipes 53. Three cooling ends 54 are installed at different heights on the conveying pipes 53, and an exhaust solenoid valve 55 is installed on the connecting pipe 52. Based on the arrangement of the three sets of air-cooling mechanisms 5 and the cooling ends 54, a circumferential cooling effect is ensured inside the sintering furnace body 3, with a certain degree of uniform cooling. The three sets of blowers can be connected to a variable frequency motor to control the wind speed and air volume, thereby ensuring the uniformity of air cooling. One end of the cooling end 54 is provided with an acceleration channel 541, and one end of the cooling end 54 is located inside the sintering furnace body 3 and is equipped with a flow guide nozzle 542. The flow guide nozzle 542 is installed on the inner wall of the cooling end 54 via an mounting ring 545. The flow guide nozzle 542 has multiple sets of flow guide surfaces 543 with different orientations, and multiple sets of flow guide ports 544 are opened on the flow guide nozzle 542 between the flow guide surfaces 543. When the confined fluid passes through the narrowed flow cross-section, its velocity increases. Air introduced into the sintering furnace body 3 from the cooling end 54 increases its velocity as it passes through the acceleration channel 541, causing it to be rapidly discharged into the inner cavity of the sintering furnace body 3 for cooling via the guide surface 543 and guide port 544 on the guide nozzle 542. The air discharged from the guide surface 543 and guide port 544 has different positions and distances, forming a dispersed discharge. This avoids direct linear cooling of the material part 32 from the cooling end 54 while increasing the area of ​​air cooling, thus improving the uniformity of cooling the material part 32. The connecting pipe 52 is equipped with a flow regulating valve and a flow monitoring device to monitor and regulate the airflow, ensuring the cooling effect. The diameters of the connecting pipe 52 and the conveying pipe 54 can be set according to actual needs, and can be either large or small.

[0034] A graphite heating field 4 for sintering is fixedly installed inside the sintering furnace body 3. The graphite heating field 4 is fixedly installed to the sintering furnace body 3 via a mounting bracket 41. The furnace cavity inside the sintering furnace body 3 is heated by the graphite heating field 4, thereby sintering the material parts 32 placed on the shelf 33.

[0035] Example: The material part 32 to be sintered is placed on the shelf 33. The reducer 7 is started to drive the transmission shaft 71, which in turn drives the synchronous lead screw 73 on the two sets of worm gear lifters 72 to rotate. This causes the guide nut 22 on the shelf 33 to rise into the sintering furnace body 3. The graphite heating field 4 is then activated to sinter the material. After sintering, the interior of the sintering furnace body 3 is cooled by three sets of air-cooling mechanisms 5.

[0036] All technical features in this embodiment can be freely combined according to actual needs.

[0037] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A laboratory sintering furnace, characterized by, The utility model provides a sintering furnace, including furnace body frame (1), fixedly installed on the top of furnace body frame (1) frame plate (2), fixedly installed on the top of frame plate (2) sintering furnace body (3) and the storage rack (33) of loading between frame plate (2) and furnace body frame (1) lift, fixedly installed with two groups of worm gear lifters (72) of drive storage rack (33) lift in furnace body frame (1) inside, the outer wall of sintering furnace body (3) and the top of storage rack (33) are ceramic fiber heat insulation layer (36), three groups of air cooling mechanism (5) are fixedly installed on the top of frame plate (2), and air cooling mechanism (5) includes fixedly installed on the top of frame plate (2) air blower (51) and cooling end (54) through sintering furnace body (3), the top of sintering furnace body (3) is equipped with hot air pipe (35), and hot air pipe (35) is internally provided with hot air exhaust (31) through sintering furnace body (3).

2. A laboratory sintering furnace as claimed in claim 1, characterized in that: The air cooling mechanism (5) further includes two groups of conveying pipes (53) installed on the outer wall of the sintering furnace body (3), and a connecting pipe (52) connected to the air blower (51) and the conveying pipes (53), the cooling end (54) is installed on the conveying pipes (53) at different height positions, and an exhaust electromagnetic valve (55) is installed on the connecting pipe (52).

3. A laboratory sintering furnace as claimed in claim 2, characterized in that: One end of the cooling end (54) is provided with an acceleration channel (541), and a flow guide nozzle (542) is installed at one end of the cooling end (54) inside the sintering furnace body (3), the flow guide nozzle (542) is installed on the inner wall of the cooling end (54) through a mounting ring (545), a plurality of flow guide curved surfaces (543) with different orientations are arranged in the flow guide nozzle (542), and a plurality of flow guide openings (544) are formed in the flow guide nozzle (542).

4. The laboratory sintering furnace according to claim 1, characterized in that: Oil cylinders (6) are fixedly installed on both sides of the hot air exhaust (31) at the top of the sintering furnace body (3), a set of jacking frames (61) are fixedly installed on the top of the oil cylinders (6), and piston blocks (62) matched with the hot air exhaust (31) are fixedly installed on the bottom of the jacking frames (61).

5. The laboratory sintering furnace according to claim 1, characterized in that: A graphite heating hot field (4) for sintering is fixedly installed in the sintering furnace body (3), and the graphite heating hot field (4) is fixedly installed on the sintering furnace body (3) through a mounting bracket (41).

6. The laboratory sintering furnace according to claim 1, characterized in that: Material pieces (32) are placed on the storage rack (33), four support columns (11) are fixedly installed on the top of the furnace body frame (1) and the bottom of the frame plate (2), four guide columns (21) are fixedly installed on the bottom of the frame plate (2), and a lifting plate (34) is welded and installed on the bottom of the storage rack (33), and the lifting plate (34) penetrates the guide columns (21).

7. A laboratory sintering furnace as claimed in claim 6, characterized in that: The furnace body frame (1) is fixedly provided with a speed reducer (7), one end of the speed reducer (7) is synchronously provided with a transmission shaft (71) fixedly arranged on the furnace body frame (1), a synchronous screw rod (73) is arranged between the top of a worm gear elevator (72) and the frame plate (2) and penetrates the furnace body frame (1), the worm gear elevator (72) penetrates the transmission shaft (71) and drives the synchronous screw rod (73) to rotate through the transmission shaft (71), and two groups of guide nuts (22) are arranged on the lifting plate (34) and penetrate the synchronous screw rod (73).

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