Powder degassing high-temperature sintering furnace

Abstract

A powder degassing high-temperature sintering furnace comprises a furnace shell, a thermal field, a sintering cavity, a feeding mechanism, a blocking mechanism, a transmission mechanism, a vacuumizing mechanism and a discharging mechanism, the thermal field is located in the furnace shell, the sintering cavity is erected in the thermal field and can rotate, a feeding and discharging port is formed in the horizontal side of the sintering cavity and located outside the thermal field, and the sealing mechanism is arranged on the sealing mechanism. The blocking mechanism is right opposite to the feeding and discharging port so as to block the feeding and discharging port, a discharging port of the feeding mechanism is located above the feeding and discharging port of the sintering cavity, the other horizontal side of the vacuum cavity is connected with the transmission mechanism, the transmission mechanism drives the vacuum cavity to rotate, and a plurality of spiral stirring blades arranged in parallel are arranged on the inner wall of the vacuum cavity. The top of the furnace shell is provided with an exhaust port, the exhaust port of the furnace shell is connected with a vacuumizing mechanism, the bottom of the furnace shell is provided with a discharging port, the discharging port of the furnace shell is adjacent to the feeding and discharging port of the sintering cavity, and the discharging port of the furnace shell is connected with a discharging mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of sintering furnaces, and in particular to a powder degassing high-temperature sintering furnace. Background Art

[0002] Some powders need to be sintered in an oxygen-free environment during high-temperature sintering. For example, ceramic powders and metal powders will undergo oxidation reactions at high temperatures after contact with air, causing the raw materials to deform, thereby reducing the quality of the sintered powders. Therefore, the cavity of the sintering furnace and the powders need to be vacuum degassed before sintering. Generally, the powders are piled in the sintering furnace for vacuum degassing. In this case, the internal powder is relatively closed to the external environment, and the air between the powders is difficult to remove. At the same time, during the sintering process, the powder on the outside is heated first, and the powder inside is heated later. This will also cause uneven heating of the powder, thereby affecting the quality of the powder after high-temperature sintering. Summary of the invention

[0003] In view of this, it is necessary to provide a powder degassing high-temperature sintering furnace that can fully remove the air in the powder and make the powder heated more evenly during the sintering process, thereby improving the sintering quality of the powder.

[0004] A powder degassing high-temperature sintering furnace comprises a furnace shell, a thermal field, a sintering cavity, a feeding mechanism, a sealing mechanism, a transmission mechanism, a vacuum mechanism, and a discharge mechanism. The thermal field is located in the furnace shell, the sintering cavity is mounted in the thermal field and can rotate, a horizontal side of the sintering cavity is provided with an inlet and outlet, the inlet and outlet are located outside the thermal field, the sealing mechanism is directly opposite to the inlet and outlet to seal the inlet and outlet, the outlet of the feeding mechanism is located obliquely above the inlet and outlet of the sintering cavity, the other horizontal side of the vacuum chamber is connected to the transmission mechanism, the transmission mechanism drives the vacuum chamber to rotate, the inner wall of the vacuum chamber is provided with a plurality of parallel spiral stirring blades to stir the powder, an exhaust port is provided at the top of the furnace shell, the exhaust port of the furnace shell is connected to the vacuum mechanism, a discharge port is provided at the bottom of the furnace shell, the discharge port of the furnace shell is adjacent to the inlet and outlet of the sintering cavity, and the discharge port of the furnace shell is connected to the discharge mechanism.

[0005] Preferably, the feeding mechanism includes a feeding pipe, a feeding motor, and a transmission blade. One end of the feeding pipe is fixedly connected to the furnace shell, and the other end of the feeding pipe is fixedly connected to the feeding motor. The rotating shaft of the feeding motor is fixedly connected to the rotating shaft of the transmission blade. The transmission blade is located in the feeding pipe. The feeding pipe is provided with a fork, and the fork is used for feeding.

[0006] Preferably, the transmission mechanism includes a rotating motor, a reducer, a transmission belt, and a transmission shaft. The rotating motor is fixedly connected to the furnace shell, the rotating shaft of the rotating motor is connected to the power input shaft of the reducer, the power output shaft of the reducer is sleeved and connected to one end of the transmission belt, the other end of the transmission belt is sleeved and connected to the transmission shaft, and the transmission shaft is fixedly connected to the sintering cavity.

[0007] Preferably, the vacuum pumping mechanism comprises a vacuum pump and a vacuum pipe, the air inlet of the vacuum pump is connected to the exhaust port of the furnace shell, and the air outlet of the vacuum pump is connected to the vacuum pipe.

[0008] Preferably, the unloading mechanism comprises a unloading pipe, a unloading valve and a material tank, the upper end of the unloading pipe is fixedly connected to the furnace shell, the unloading valve is arranged on the unloading pipe, and the lower end of the unloading pipe is connected to the material tank.

[0009] Preferably, the sealing mechanism includes an electric push rod and a sealing cover, wherein the electric push rod is fixedly connected to the furnace shell, the telescopic shaft of the electric push rod passes through the furnace shell and is sleeve-connected to the sealing cover, the sealing cover can rotate around the axis of the telescopic shaft, the sealing cover is opposite to the inlet and outlet of the sintering cavity, and the sealing cover can be moved horizontally to seal the sintering cavity.

[0010] Beneficial effect: When degassing, the powder degassing high-temperature sintering furnace of the present invention starts the transmission mechanism to rotate the sintering cavity, thereby driving the stirring blades to rotate, and then driving the powder in the sintering cavity to move with the stirring blades. Under the action of the stirring blades, the powder inside can also be stirred to the surface, so that the air in the powder can be fully extracted, and the degassing effect is better. When the present invention feeds the sintering cavity, it is pushed by the transmission blades and finally slides into the sintering cavity. There is no need to open the sealing door on the furnace shell, which is more conducive to maintaining a better vacuum environment in the furnace shell. When the present invention performs high-temperature sintering on the powder, the sintering cavity is first closed with a blocking mechanism to make the thermal insulation performance of the sintering cavity better. Then start the transmission mechanism, during the rotation process, the powder is heated more evenly, and the quality of the powder after sintering is better. After sintering is completed, the sintering cavity is rotated in the opposite direction, and at the same time, the discharge valve is opened, and the material in the vacuum cavity can smoothly fall into the discharge mechanism. The whole process is also in a sealed state, so the powder will not affect the final sintering quality due to contact with the air. The entire powder degassing high temperature sintering furnace can effectively improve the sintering quality of the powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of a powder degassing high temperature sintering furnace of the present invention at a preferred angle.

[0012] Figure 2 This is a schematic structural diagram of another preferred angle of the powder degassing high-temperature sintering furnace of the present invention.

[0013] Figure 3It is a schematic diagram of the internal structure of the powder degassing high-temperature sintering furnace of the present invention.

[0014] In the figure: powder degassing high temperature sintering furnace 10, furnace shell 20, thermal field 30, sintering chamber 40, stirring blades 401, feeding mechanism 50, feeding pipeline 501, feeding motor 502, transmission blades 503, blocking mechanism 60, electric push rod 601, sealing cover 602, transmission mechanism 70, rotating motor 701, reducer 702, transmission shaft 703, vacuum mechanism 80, vacuum pump 801, vacuum pipeline 802, unloading mechanism 90, unloading pipeline 901, unloading valve 902, material tank 903. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Please see Figures 1 to 3 A powder degassing high temperature sintering furnace 10 includes a furnace shell 20, a thermal field 30, a sintering cavity 40, a feeding mechanism 50, a blocking mechanism 60, a transmission mechanism 70, a vacuum mechanism 80, and a discharge mechanism 90. The thermal field 30 is located in the furnace shell 20, the sintering cavity 40 is set up in the thermal field 30 and can rotate, a feed inlet and a discharge port are arranged on a horizontal side of the sintering cavity 40, and the feed inlet and the discharge port are located outside the thermal field 30. The blocking mechanism 60 is opposite to the feed inlet and the discharge port to block the feed inlet and the discharge port. The discharge port of the feeding mechanism 50 is located at the sintering cavity 40. The other horizontal side of the vacuum chamber is connected to the transmission mechanism 70, which drives the vacuum chamber to rotate. The inner wall of the vacuum chamber is provided with a plurality of parallel spiral stirring blades 401 to stir the powder. An exhaust port is provided at the top of the furnace shell 20, and the exhaust port of the furnace shell 20 is connected to the vacuum pumping mechanism 80. A discharge port is provided at the bottom of the furnace shell 20, and the discharge port of the furnace shell 20 is adjacent to the inlet and outlet of the sintering cavity 40, and the discharge port of the furnace shell 20 is connected to the discharge mechanism 90.

[0017] The furnace shell 20 of the present invention is the outer shell of the sintering furnace, and a furnace door is provided on one side thereof. The heat field 30 is fixed in the furnace shell 20, and the heat field of the present invention refers to the heat insulation screen and the area for heating surrounded by the heat insulation screen. The inner wall of the heat field 30 is provided with a heater to make the spatial temperature in the heat field 30 uniform. The sintering cavity 40 is set on both sides of the heat field 30 and is heated in the heat field. At the same time, due to the blocking of the blocking mechanism 60, the heat exchange between the sintering cavity 40 and the outside world is also less, so that a good thermal insulation effect can be achieved in the sintering cavity 40. The sintering cavity 40 is filled with powder, and while the sintering cavity 40 is heated, the heat is also conducted to the powder. During sintering, as the sintering cavity 40 rotates, the powder inside is also stirred, so that the powder can be heated evenly.

[0018] When the powder is evacuated, the powder is also stirred by the stirring of the sintering chamber 40 , so that the powder in the center or the powder at the bottom is stirred to the surface, thereby improving the efficiency and quality of degassing.

[0019] The entire loading and unloading process of the present invention can also be carried out in a relatively closed environment, and the chance of powder contacting with air is significantly reduced, so that the powder can achieve better quality after sintering.

[0020] The feeding mechanism 50 of the present invention can better ensure relative sealing during the powder feeding process. In a preferred embodiment, the feeding mechanism 50 includes a feeding pipe 501, a feeding motor 502, and a transmission blade 503. One end of the feeding pipe 501 is fixedly connected to the furnace shell 20, and the other end of the feeding pipe 501 is fixedly connected to the feeding motor 502. The rotating shaft of the feeding motor 502 is fixedly connected to the rotating shaft of the transmission blade 503. The transmission blade 503 is located in the feeding pipe 501, and the feeding pipe 501 is provided with a bifurcation, which is used for feeding.

[0021] The powder enters the feed pipe 501 along the bifurcation, and under the action of the transmission blade 503, the powder enters the sintering cavity 40. Since the transmission blade 503 has a driving effect, the bifurcation of the feed pipe 501 can be set relatively small, and the powder will not be blocked, thereby reducing the amount of air entering. At the same time, the transmission blade 503 can provide a certain driving force in the horizontal direction, so that the powder can obtain a certain speed in the horizontal direction and can fall into the sintering cavity 40 better.

[0022] The transmission mechanism 70 is used to drive the sintering cavity 40 to rotate. In a preferred embodiment, the transmission mechanism 70 includes a rotating motor 701, a reducer 702, a transmission belt, and a transmission shaft 703. The rotating motor 701 is fixedly connected to the furnace shell 20, the rotating shaft of the rotating motor 701 is connected to the power input shaft of the reducer 702, the power output shaft of the reducer 702 is sleeved and connected to one end of the transmission belt, and the other end of the transmission belt is sleeved and connected to the transmission shaft 703, and the transmission shaft 703 is fixedly connected to the sintering cavity 40.

[0023] The sintering chamber 40 does not require a faster rotation speed, but the motor itself has a relatively fast rotation speed. The speed reducer 702 can effectively reduce the rotation speed. The speed reducer 702 is connected to the transmission shaft 703 through a transmission belt, and the transmission belt drives the transmission shaft 703 by friction, thereby driving the sintering chamber 40 to rotate. In addition to the belt drive connection, the speed reducer 702 and the transmission shaft 703 can also be connected by chain drive. When the chain drive is connected, sprockets need to be provided on the retriever and the transmission shaft 703 accordingly.

[0024] In a preferred embodiment, the vacuum pumping mechanism 80 includes a vacuum pump 801 and a vacuum pipe 802. The air inlet of the vacuum pump 801 is connected to the exhaust port of the furnace shell 20, and the air outlet of the vacuum pump 801 is connected to the vacuum pipe 802. When vacuuming, the vacuum pump 801 is started, and the gas in the furnace shell 20 is taken out along the vacuum pipe 802. The vacuum pump 801 can be a mechanical pump, a Roots pump, a molecular pump, etc., as long as it can reach the required vacuum degree.

[0025] In a preferred embodiment, the unloading mechanism 90 includes a unloading pipe 901, a unloading valve 902, and a material tank 903. The upper end of the unloading pipe 901 is fixedly connected to the furnace shell 20, the unloading valve 902 is arranged on the unloading pipe 901, and the lower end of the unloading pipe 901 is connected to the material tank 903.

[0026] The material tank 903 and the discharge pipe 901 can be connected by a flange, so that the sealing during the discharge process can be ensured. The powder can enter the material tank 903 multiple times. When the material tank 903 is full of powder, the bolts on the flange are removed. During the replacement of the material tank 903, the discharge valve 902 is in a closed state.

[0027] In a preferred embodiment, the blocking mechanism 60 includes an electric push rod 601 and a cover 602. The electric push rod 601 is fixedly connected to the furnace shell 20. The telescopic shaft of the electric push rod 601 passes through the furnace shell 20 and is sleeved and connected with the cover 602. The cover 602 can rotate around the axis of the telescopic shaft. The cover 602 is directly opposite to the inlet and outlet of the sintering cavity 40, so as to horizontally move the cover 602 to block the sintering cavity 40. The diameter of the cover 602 is the same as the diameter of the inlet and outlet of the sintering cavity 40, and it is an interference fit or a clearance fit, so that a good seal is maintained in the vacuum cavity, which can reduce the loss of heat. The cover 602 and the telescopic shaft can be connected by a universal joint or a bearing. Since the furnace shell 20 is relatively sealed, it is not possible to observe the blocking condition of the cover 602 well, and an observation window can be set on the furnace door. In order to facilitate sealing, the length of the telescopic shaft is just enough to block the sintering cavity 40.

[0028] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A powder degassing high temperature sintering furnace, characterized in that: It includes a furnace shell, a thermal field, a sintering cavity, a feeding mechanism, a sealing mechanism, a transmission mechanism, a vacuum mechanism, and a discharge mechanism. The thermal field is located in the furnace shell, the sintering cavity is mounted in the thermal field and can rotate, a horizontal side of the sintering cavity is provided with an inlet and outlet, the inlet and outlet are located outside the thermal field, the sealing mechanism is directly opposite to the inlet and outlet to seal the inlet and outlet, the outlet of the feeding mechanism is located obliquely above the inlet and outlet of the sintering cavity, the other horizontal side of the vacuum chamber is connected to the transmission mechanism, the transmission mechanism drives the vacuum chamber to rotate, the inner wall of the vacuum chamber is provided with a plurality of parallel spiral stirring blades to stir the powder, an exhaust port is provided at the top of the furnace shell, the exhaust port of the furnace shell is connected to the vacuum mechanism, a discharge port is provided at the bottom of the furnace shell, the discharge port of the furnace shell is adjacent to the inlet and outlet of the sintering cavity, and the discharge port of the furnace shell is connected to the discharge mechanism.

2. The powder degassing high temperature sintering furnace according to claim 1, characterized in that: The feeding mechanism includes a feeding pipe, a feeding motor, and a transmission blade. One end of the feeding pipe is fixedly connected to the furnace shell, and the other end of the feeding pipe is fixedly connected to the feeding motor. The rotating shaft of the feeding motor is fixedly connected to the rotating shaft of the transmission blade. The transmission blade is located in the feeding pipe. The feeding pipe is provided with a fork, and the fork is used for feeding.

3. The powder degassing high temperature sintering furnace according to claim 1, characterized in that: The transmission mechanism includes a rotating motor, a reducer, a transmission belt, and a transmission shaft. The rotating motor is fixedly connected to the furnace shell, the rotating shaft of the rotating motor is connected to the power input shaft of the reducer, the power output shaft of the reducer is sleeved and connected to one end of the transmission belt, the other end of the transmission belt is sleeved and connected to the transmission shaft, and the transmission shaft is fixedly connected to the sintering cavity.

4. The powder degassing high temperature sintering furnace according to claim 1, characterized in that: The vacuum pumping mechanism comprises a vacuum pump and a vacuum pipe. The air inlet of the vacuum pump is connected to the exhaust port of the furnace shell, and the air outlet of the vacuum pump is connected to the vacuum pipe.

5. The powder degassing high temperature sintering furnace according to claim 1, characterized in that: The unloading mechanism comprises a unloading pipe, a unloading valve and a material tank. The upper end of the unloading pipe is fixedly connected to the furnace shell, the unloading valve is arranged on the unloading pipe, and the lower end of the unloading pipe is connected to the material tank.

6. The powder degassing high temperature sintering furnace according to claim 1, characterized in that: The sealing mechanism includes an electric push rod and a sealing cover. The electric push rod is fixedly connected to the furnace shell. The telescopic shaft of the electric push rod passes through the furnace shell and is sleeve-connected to the sealing cover. The sealing cover can rotate around the axis of the telescopic shaft. The sealing cover is opposite to the inlet and outlet of the sintering cavity, so that the sealing cover can be moved horizontally to seal the sintering cavity.

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