Vacuum displacement type feeding and discharging device of continuous furnace with pressed powder

Abstract

This utility model relates to the technical field of powder heat treatment equipment, and in particular to a vacuum replacement feeding and discharging device for a pressurized continuous powder furnace. The pressurized continuous powder furnace vacuum replacement feeding and discharging device includes: a furnace body, a feeding hopper, a mounting frame, a gas supply mechanism, and a control cabinet. A feeding main pipe is installed at one end of the furnace body, and a discharging main pipe is installed at the other end of the furnace body. Feeding hoppers are symmetrically arranged at the end of the furnace body near the feeding main pipe. The pressurized continuous powder furnace vacuum replacement feeding and discharging device provided by this utility model realizes a parallel operation mode of "one hopper continuously feeding into the furnace and the other hopper simultaneously completing feeding and vacuum replacement" by symmetrically setting two independent feeding hoppers at the feeding end of the furnace body. This completely eliminates the furnace material interruption problem during the gas replacement and depressurization stages in the traditional single-hopper structure, greatly improves the effective operating rate of the equipment, increases the overall production capacity, and fully meets the needs of large-scale industrial mass production in the new energy and new materials industries.

Description

Technical Field

[0001] This utility model relates to the technical field of powder heat treatment equipment, and in particular to a vacuum replacement feeding and discharging device for a pressurized continuous powder furnace. Background Technology

[0002] With the rapid development of the new energy and new materials industries, the demand for high-temperature heat treatment of powder materials such as lithium battery cathode and anode materials, tungsten, molybdenum, and rare earth metal powders, ultrafine chemical powders, and carbon materials is increasing. To prevent active powders from undergoing oxidation, spontaneous combustion, or even explosion reactions with oxygen and water vapor in the air at high temperatures, and to ensure the stability of the heat treatment process, the sintering, reduction, and carbonization processes of the above-mentioned powders are generally carried out in pressurized closed continuous furnaces, where an inert protective atmosphere with a slight positive pressure to medium-high pressure is maintained for a long time.

[0003] Vacuum displacement feeding and discharging devices are core supporting equipment for pressurized continuous powder furnaces. Their function is to achieve continuous feeding and discharging of powder materials without disrupting the sealed, pressurized environment within the furnace. Currently, the industry commonly uses vacuum displacement feeding and discharging devices with a single-chamber, single-displacement-compartment structure. However, this has shortcomings in actual industrial production: a single compartment can only complete the feeding, displacement, discharging, and depressurization processes sequentially. During the gas displacement and depressurization period in the displacement compartment, the furnace is completely without material, making continuous production impossible. Secondly, to ensure that the air trapped between powder particles is completely replaced and to prevent material oxidation, a single feeding typically requires 2-4 cycles of "vacuuming-protective gas filling," with the entire displacement process accounting for over 60% of the single compartment's operating cycle. This significant waiting time results in low equipment efficiency, severely limiting the overall capacity of the continuous furnace and failing to meet the demands of large-scale industrial production.

[0004] Therefore, it is necessary to provide a new vacuum displacement feeding and discharging device for a pressurized continuous powder furnace to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a vacuum displacement feeding and discharging device for a pressurized continuous powder furnace.

[0006] The vacuum displacement feeding and discharging device for a continuous pressurized powder furnace provided by this utility model includes: a furnace body, a feeding hopper, a mounting frame, a gas supply mechanism, and a control cabinet. A main feed pipe is installed at one end of the furnace body, and a main discharge pipe is installed at the other end. Feed hoppers are symmetrically arranged at the end of the furnace body near the main feed pipe. A mounting frame is installed on the top of the end of the furnace body near the main feed pipe, and all feeding hoppers are installed inside the mounting frame. A gas supply mechanism is installed on the top of the furnace body, and a control cabinet is installed on the side wall of the furnace body. A raw material tank is fixedly connected to the top of the mounting frame, and a conveyor is connected to the bottom of the raw material tank. The other end of the conveying pipe is equipped with a three-way ball valve. Both sides of the three-way ball valve are connected to feeding pipes. The bottom end of each feeding pipe is connected to the top of the corresponding feeding hopper. A feeding valve is installed inside the feeding pipe. The bottom end of each feeding hopper is connected to a discharge pipe. The other end of each discharge pipe is connected to the main inlet pipe. A discharge valve is installed inside each discharge pipe. A vacuum pump is fixedly connected to the top of the mounting frame. The input end of the vacuum pump is connected to two branch pipes. The other end of each branch pipe is connected to the top side wall of the corresponding feeding hopper. A solenoid valve is installed at the end of each branch pipe near the feeding hopper.

[0007] Preferably, the sidewalls of the air supply mechanism are symmetrically connected with air supply pipes, the other end of each air supply pipe is connected to the top sidewall of the corresponding feeding hopper, and a solenoid valve is installed at the end of each air supply pipe near the feeding hopper.

[0008] Preferably, the top of each feeding hopper is connected to a vent pipe, and a solenoid valve is installed inside each vent pipe. A tail gas collection mechanism is installed on the top of the furnace body, and the other end of each vent pipe is connected to the tail gas collection mechanism.

[0009] Compared with related technologies, the vacuum displacement feeding and discharging device for pressurized powder continuous furnace provided by this utility model has the following advantages: By symmetrically setting two independent feeding bins at the furnace feeding end, a parallel operation mode of "one bin continuously feeding into the furnace and the other bin simultaneously completing feeding and vacuum replacement" is realized, which completely eliminates the furnace material interruption problem during the gas replacement and depressurization stages in the traditional single-bin structure, greatly improves the effective operating rate of the equipment, increases the overall production capacity, and fully meets the needs of large-scale industrial mass production in the new energy and new materials industries. The design of using a shared vacuum pump and gas supply mechanism for both chambers optimizes the gas replacement process and significantly reduces the ineffective loss of protective gas. The alternating operation mode of the two chambers avoids the waste of frequent full-cavity filling and discharging of a single chamber. Each replacement only requires operation on a single feeding chamber, and the pretreatment process and the feeding process run in parallel, reducing the concentrated consumption of protective gas. The two feeding hoppers operate independently. When one of the feeding hoppers or its associated valves malfunctions and needs maintenance, the other feeding hopper can continue to supply material to the furnace independently, without requiring the entire production line to be shut down, thus significantly reducing unplanned downtime. Attached Figure Description

[0010] Figure 1 A schematic diagram of the structure of the vacuum displacement feeding and discharging device for a continuous pressurized powder furnace provided by this utility model; Figure 2 for Figure 1 The diagram shows the structure of the raw material tank. Figure 3 for Figure 2 The diagram shows the structure at point A. Figure 4 for Figure 2 The diagram shows the structural schematic of the side of the mounting bracket.

[0011] The following are the labels in the diagram: 1. Furnace body; 2. Main feed pipe; 3. Feeding hopper; 4. Mounting frame; 5. Gas supply mechanism; 6. Control cabinet; 7. Raw material tank; 8. Conveying pipe; 9. Three-way ball valve; 10. Feeding valve; 11. Discharging valve; 12. Vacuum pump; 13. Solenoid valve one; 14. Gas supply pipe; 15. Solenoid valve two; 16. Solenoid valve three; 17. Exhaust gas collection mechanism. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0013] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0014] Please see Figures 1 to 4 A vacuum displacement feeding and discharging device for a continuous pressurized powder furnace is disclosed. The device includes a furnace body 1, a feeding hopper 3, a mounting frame 4, an air supply mechanism 5, and a control cabinet 6. A feeding main pipe 2 is installed at one end of the furnace body 1, and a discharging main pipe is installed at the other end of the furnace body 1. Feeding hoppers 3 are symmetrically arranged at the end of the furnace body 1 near the feeding main pipe 2. A mounting frame 4 is installed on the top of the end of the furnace body 1 near the feeding main pipe 2. All feeding hoppers 3 are installed inside the mounting frame 4. An air supply mechanism 5 is installed on the top of the furnace body 1, and a control cabinet 6 is installed on the side wall of the furnace body 1.

[0015] The top of the mounting frame 4 is fixedly connected to the raw material tank 7. The bottom of the raw material tank 7 is connected to the conveying pipe 8. The other end of the conveying pipe 8 is equipped with a three-way ball valve 9. Both sides of the three-way ball valve 9 are connected to the feeding pipe. The bottom of the feeding pipe is connected to the top of the corresponding feeding bin 3. The feeding pipe is equipped with a feeding valve 10.

[0016] The bottom of each feeding hopper 3 is connected to a discharge pipe, and the other end of each discharge pipe is connected to the main feeding pipe 2. Each discharge pipe is equipped with a discharge valve 11.

[0017] A vacuum pump 12 is fixedly connected to the top of the mounting frame 4. The input end of the vacuum pump 12 is connected to two branch pipes. The other end of each branch pipe is connected to the top side wall of the corresponding feeding bin 3. A solenoid valve 13 is installed on the end of each branch pipe near the feeding bin 3.

[0018] The side wall of the air supply mechanism 5 is symmetrically connected with air supply pipes 14. The other end of each air supply pipe 14 is connected to the top side wall of the corresponding feeding bin 3, and a solenoid valve 15 is installed on the end of each air supply pipe 14 near the feeding bin 3.

[0019] The top of each feeding hopper 3 is connected to a vent pipe, and each vent pipe is equipped with a solenoid valve 16. The top of the furnace body 1 is equipped with a tail gas collection mechanism 17, and the other end of each vent pipe is connected to the tail gas collection mechanism 17.

[0020] It should be noted that: this embodiment only describes the specific structure of the feeding unit in detail. The discharge unit at the other end of the furnace body 1 adopts the same double-compartment parallel structure as the feeding unit. Its component composition, connection relationship and material requirements are the same as those of the feeding unit, only the working process is reversed. The pressurized protective atmosphere includes nitrogen, argon, hydrogen and their mixed gases, which are suitable for pressurized continuous powder furnaces under micro-positive pressure to medium-high pressure conditions. A screw conveyor is installed inside the conveying pipe 8 for conveying materials.

[0021] The working principle of the vacuum displacement feeding and discharging device for a continuous pressurized powder furnace provided by this utility model is as follows: Before the device is started, all valves are fully closed: feeding valve 10, discharging valve 11, solenoid valve 13, solenoid valve 2 15, solenoid valve 3 16, and three-way ball valve 9 are all closed; the furnace body 1 has completed heating and pressurization, and stably maintained the pressurized protective atmosphere required by the process; the raw material tank 7 stores the powder material to be processed; the vacuum pump 12, the gas supply mechanism 5, and the tail gas collection mechanism 17 are in standby mode; the control cabinet 6 is powered on and has completed self-test, and all detection instrument signals are normal.

[0022] Control cabinet 6 issues a command to open the three-way ball valve 9 to the passage to the left feeding hopper 3, and at the same time open the corresponding feeding valve 10 of the left feeding hopper 3; the powder material in the raw material tank 7 relies on its own weight to enter the left feeding hopper 3 through the conveying mechanism in the conveying pipe 8, the three-way ball valve 9 and the feeding pipe; when the material level gauge in the left feeding hopper 3 detects that the material level has reached the set upper limit, control cabinet 6 automatically closes the feeding valve 10 of the left feeding hopper 3, and then closes the three-way ball valve 9, so that the left feeding hopper 3 forms a completely sealed independent cavity.

[0023] Next, open the solenoid valve 13 corresponding to the left feeding hopper 3, start the vacuum pump 12, and perform the first vacuuming of the left feeding hopper 3 until the pressure inside the hopper reaches the set negative pressure value, removing most of the air inside the hopper and the free air trapped between the powder particles; close the solenoid valve 13 corresponding to the left feeding hopper 3, open the solenoid valve 2 15 corresponding to the left feeding hopper 3, and the gas supply mechanism 5 introduces inert protective gas with the same composition as the furnace body 1 into the left feeding hopper 3, so that the pressure inside the hopper rises back to near atmospheric pressure; Repeat the above "vacuuming-protective gas filling" cycle 2 to 4 times until the online oxygen content analyzer in the left feeding hopper 3 detects that the oxygen content is ≤ the process set limit; close the solenoid valve 15 of the left feeding hopper 3, the gas replacement of the left feeding hopper 3 is completed, and it is ready to feed material to the furnace body 1.

[0024] Slightly open the solenoid valve 15 of the left feeding hopper 3 again to slowly replenish the protective gas into the left feeding hopper 3, and monitor the pressure difference between the left feeding hopper 3 and the furnace body 1 in real time until the pressure inside the left feeding hopper 3 is precisely balanced with the pressure of the furnace body 1; after the pressure is balanced, the control cabinet 6 interlocks and unlocks the discharge valve 11 corresponding to the left feeding hopper 3, opens the discharge valve 11, and the powder material in the left feeding hopper 3 enters the feed main pipe 2 through the discharge pipe via the discharge component, and is finally continuously sent into the furnace body 1 for heat treatment; Throughout the entire process of feeding material from the left feeding hopper 3 to the furnace body 1, the control cabinet 6 simultaneously starts the pre-treatment process of the right feeding hopper 3: opening the three-way ball valve 9 to the passage of the right feeding hopper 3, opening the feeding valve 10 of the right feeding hopper 3, and feeding material into the right feeding hopper 3 to the set material level; closing the feeding valve 10 and the three-way ball valve 9 of the right feeding hopper 3 to seal the right feeding hopper 3; opening the solenoid valve 13 of the right feeding hopper 3, and starting the vacuum pump 12 to perform vacuuming and protective gas circulation replacement on the right feeding hopper 3 until the oxygen content of the right feeding hopper 3 reaches the standard.

[0025] When the level gauge in the left feeding hopper 3 detects that the material level has dropped to the set lower limit, the control cabinet 6 immediately closes the discharge valve 11 of the left feeding hopper 3, cutting off the connection between the left feeding hopper 3 and the furnace body 1; opens the corresponding solenoid valve 16 of the left feeding hopper 3, and the protective gas in the left feeding hopper 3 is discharged into the tail gas collection mechanism 17 through the vent pipe for treatment until the pressure in the left feeding hopper 3 is depressurized to atmospheric pressure; closes the solenoid valve 16 of the left feeding hopper 3, and the left feeding hopper 3 returns to the empty standby state; At this time, the right-side feeding hopper 3 has completed all gas replacement. The control cabinet 6 slightly opens the solenoid valve 15 of the right-side feeding hopper 3 to precisely balance the pressure of the right-side feeding hopper 3 to the pressure of the furnace body 1.

[0026] After the pressure in the right feeding hopper 3 is balanced, the discharge valve 11 of the right feeding hopper 3 is opened, and the right feeding hopper 3 begins to continuously feed material into the furnace body 1. During the feeding of material into the right feeding hopper 3, the control cabinet 6 restarts the feeding and vacuum replacement process of the left feeding hopper 3 to prepare for the next round of feeding. In this way, the two feeding hoppers 3 alternate to achieve uninterrupted continuous feeding into the furnace body 1.

[0027] The discharge unit at the other end of the furnace body 1 adopts the same dual-compartment parallel structure as the feeding unit, and the working process is executed in reverse: the finished powder after heat treatment in the furnace enters the first discharge replacement chamber through the discharge main pipe, and the valve connecting the discharge chamber and the furnace body 1 is closed; the discharge replacement chamber is evacuated to remove the furnace protective gas trapped in the chamber; air or low-pressure protective gas is introduced into the discharge replacement chamber and depressurized to atmospheric pressure; the valve on the outside of the discharge chamber is opened to discharge the finished powder to the receiving tank; while the first discharge chamber processes the discharge, the second discharge chamber receives the finished powder discharged from the furnace, and the two chambers work alternately to achieve continuous discharge.

[0028] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A vacuum displacement feeding and discharging device for a pressurized continuous powder furnace, characterized in that, include: Furnace body (1), one end of furnace body (1) is equipped with a feed main pipe (2), and the other end of furnace body (1) is equipped with a discharge main pipe; Feeding bin (3): The furnace body (1) is symmetrically provided with feeding bins (3) at one end near the main feed pipe (2); Mounting frame (4), the top of the furnace body (1) near the feed main pipe (2) is mounted with mounting frame (4), and the feeding bins (3) are all installed inside the mounting frame (4); Gas supply mechanism (5) is installed on the top of the furnace body (1); Control cabinet (6), the control cabinet (6) is installed on the side wall of the furnace body (1); The top of the mounting bracket (4) is fixedly connected to the raw material tank (7), the bottom of the raw material tank (7) is connected to the conveying pipe (8), the other end of the conveying pipe (8) is equipped with a three-way ball valve (9), both sides of the three-way ball valve (9) are connected to the feeding pipe, the bottom of the feeding pipe is connected to the top of the corresponding feeding bin (3), and the feeding valve (10) is installed inside the feeding pipe. The bottom of each feeding hopper (3) is connected to a discharge pipe, and the other end of each discharge pipe is connected to the main feeding pipe (2). Each discharge pipe is equipped with a discharge valve (11). A vacuum pump (12) is fixedly connected to the top of the mounting bracket (4). The input end of the vacuum pump (12) is connected to two branch pipes. The other end of each branch pipe is connected to the top side wall of the corresponding feeding bin (3). A solenoid valve (13) is installed on the end of each branch pipe near the feeding bin (3).

2. The vacuum displacement type charging and discharging apparatus for a belt pressurized powder continuous furnace according to claim 1, wherein The side wall of the air supply mechanism (5) is symmetrically connected with an air supply pipe (14). The other end of the air supply pipe (14) is connected to the top side wall of the corresponding feeding bin (3). Solenoid valve 2 (15) is installed on the end of the air supply pipe (14) near the feeding bin (3).

3. The vacuum displacement type charging and discharging apparatus of a band-type powder pressing continuous furnace according to claim 2, wherein The top of the feeding hopper (3) is connected to a vent pipe, and the inside of the vent pipe is equipped with a solenoid valve (16). The top of the furnace body (1) is equipped with a tail gas collection mechanism (17), and the other end of the vent pipe is connected to the tail gas collection mechanism (17).

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