A tungsten oxide doped device

Abstract

The utility model relates to powder metallurgy technical field, specifically disclose a tungsten oxide doping device, including solution jar and cloth mechanism, solution jar lower intercommunication installation has atomizer, the output of atomizer is connected with buffer tank through pipeline intercommunication, and the outside of buffer tank is provided with heating wire, and the output of buffer tank is connected with nozzle through intermediate pipe intercommunication installation, and intermediate pipe series connection installation has solenoid valve, and cloth mechanism includes lift cylinder, and the drive rod of lift cylinder is fixedly installed cloth hopper through support, and nozzle sets up in cloth hopper bottom one side. The subsidiary mechanism of the device cloth unit of the application, can carry out spray doping while automatic cloth, do not influence the efficiency of tungsten powder production, can improve the dust problem in the reduction furnace cloth process.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy technology, and more specifically, to a tungsten oxide doping device. Background Technology

[0002] Doping is a common method in powder metallurgy to improve the physical and chemical properties of powders. For example, adding an appropriate amount of sodium to tungsten oxide can significantly improve the particle size and uniformity of particle size distribution of tungsten powder. For instance, patent CN109014235A discloses a method for preparing medium-sized tungsten powder, characterized by adding tungsten oxide raw material to a mixer, then adding an alkaline solution, followed by hydrogen reduction, and preparing tungsten powder with a certain and uniform particle size by using appropriate reduction process parameters. Patent CN105903977A discloses a method for producing potassium-doped tungsten powder by first alkali washing and then acid washing, characterized by first preparing doped blue tungsten in a doping pot, then reducing the doped blue tungsten, and finally alkali washing and acid washing of the tungsten powder to obtain doped tungsten powder with a certain particle size.

[0003] Currently, tungsten oxide doping is usually carried out during the batching / mixing process after calcination, generally using a specially designed batching / mixing device with an internal spray nozzle. The amount of material mixed in one batch is usually 500kg-1000kg. After the tungsten oxide is evenly mixed with the alkaline solution, it is fed into a reduction furnace for reduction. However, recent studies have shown that when the doped tungsten oxide is loaded in a boat, the conditions of contact with hydrogen gas are not uniform for different materials in the reaction bed. Therefore, adding more or more uniform alkaline solution to the tungsten oxide raw material is not necessarily better. In particular, trace amounts of alkali metals remaining at the bottom of the boat can cause abnormal growth and agglomeration of tungsten powder particles, resulting in coarse inclusions, indistinct grain boundaries, and poor uniformity in the prepared cemented carbide, ultimately leading to a decrease in the alloy's impact resistance and thermal fatigue wear resistance.

[0004] In summary, with increasingly stringent quality requirements for cemented carbide in modern industry, the traditional method of uniformly mixing tungsten oxide with alkaline solution in a batching / mixer before reduction leads to inhomogeneity in the subsequent products. Therefore, the purpose of this invention is to provide a refined and automated doping device for tungsten oxide and alkaline solution doping, enabling fully automated doping of tungsten oxide in different regions of a boat with alkaline solution of varying concentrations. This improves product uniformity while also solving the dust problem during the reduction furnace feeding process. Utility Model Content

[0005] In view of the above-mentioned technical problems in related technologies, this utility model provides a tungsten oxide doping device that can solve the above problems.

[0006] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: A tungsten oxide doping device includes a solution tank and a feeding mechanism. An atomizer is installed below the solution tank. The output end of the atomizer is connected to a buffer tank via a pipe. A heating wire is installed outside the buffer tank. A nozzle is installed at the output end of the buffer tank via an intermediate pipe. A solenoid valve is installed in series on the intermediate pipe. The feeding mechanism includes a lifting cylinder. A feeding hopper is fixedly installed on the drive rod of the lifting cylinder via a bracket. The nozzle is located on one side of the bottom of the feeding hopper.

[0007] Furthermore, a pressure gauge is connected to the top of the buffer tank.

[0008] Furthermore, the heating wire is located at the bottom of the buffer tank.

[0009] Furthermore, the bottom of the solution tank is conical, and a manual valve is connected in series between the solution tank and the atomizer.

[0010] Furthermore, a safety valve is installed at the top of the buffer tank.

[0011] The beneficial effects of this utility model are as follows: The auxiliary mechanism of the feeding unit of the device in this application can perform spray mixing while automatically feeding the material, without affecting the efficiency of tungsten powder production, and can improve the dust problem in the feeding process of the reduction furnace.

[0012] This device, controlled by a PLC, enables fully automated doping of tungsten oxide in different regions of a boat with alkaline solutions of varying concentrations. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the structure of a tungsten oxide doping device according to an embodiment of the present invention.

[0016] In the picture: 1. Atomizer; 2. Heating wire; 3. Nozzle; 4. Solenoid valve; 5. Pressure gauge; 6. Safety valve; 7. Buffer tank; 8. Lifting cylinder; 9. Solution tank; 10. Fabric hopper. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0018] Example 1: As Figure 1 As shown, this tungsten oxide doping device mainly consists of a solution tank, an atomizer, a buffer tank, a nozzle, a material distribution mechanism, and related control components.

[0019] Solution tank 9 is used to store the prepared alkaline solution. Its bottom is conical to facilitate the smooth flow of the solution. Atomizer 1 is connected and installed below solution tank 9. A manual valve is connected in series between solution tank 9 and atomizer 1, which can control the flow rate of the solution into atomizer 1.

[0020] The output end of the atomizer 1 is connected to the buffer tank 7 via a pipe. A heating wire 2 is installed on the outside of the buffer tank 7, located at the bottom of the buffer tank 7, for heating the buffer tank 7. A pressure gauge 5 and a safety valve 6 are connected and installed at the top of the buffer tank 7. The pressure gauge 5 is used to display the pressure inside the buffer tank 7 in real time, and the safety valve 6 automatically opens when the pressure exceeds the set value to ensure the safety of the device.

[0021] The output end of the buffer tank 7 is connected to a nozzle 3 via an intermediate pipe. A solenoid valve 4 is connected in series in the intermediate pipe and is controlled by a PLC program.

[0022] The fabric feeding mechanism includes a lifting cylinder 8. The drive rod of the lifting cylinder 8 is fixedly mounted on a fabric hopper 10 via a bracket. The nozzle 3 is located on one side of the bottom of the fabric hopper 10 to perform spray mixing during the fabric feeding process.

[0023] Install the solution tank 9 in a suitable position, ensuring the stability of its bottom conical structure. Install the atomizer 1 below the solution tank 9 and connect it to the solution tank 9 via a pipe, installing a manual valve between the two.

[0024] Install the buffer canister 7 at a suitable position corresponding to the output end of the atomizer 1, and connect the output end of the atomizer 1 to the buffer canister 7 through a pipe. Install the heating wire 2 at the bottom of the outside of the buffer canister 7, and install the pressure gauge 5 and the safety valve 6 at the top of the buffer canister 7.

[0025] The nozzle 3 is connected to the output end of the buffer tank 7 through the intermediate pipe, and a solenoid valve 4 is installed in series on the intermediate pipe.

[0026] Install the fabric feeding mechanism, fix the lifting cylinder 8 in a suitable position, and install the fabric hopper 10 on the drive rod of the lifting cylinder 8 through the bracket, ensuring that the nozzle 3 is located on the bottom side of the fabric hopper 10.

[0027] Electrically connect the heating wire 2, solenoid valve 4, and PLC control system. Configure the PLC program to set the on / off signals of solenoid valve 4 at the start and end of the fabric application, as well as the spray concentration and time parameters required for tungsten oxide doping in different areas, according to actual production needs.

[0028] Adjust pressure gauge 5 and safety valve 6 to ensure that pressure gauge 5 can accurately display the pressure in buffer tank 7 and that safety valve 6 can open normally when the pressure exceeds the set value.

[0029] Solution preparation In a 100L solution tank 9, add an appropriate amount of Na2CO3 solid and deionized water, and stir thoroughly with a stirring device to prepare a Na2CO3 solution with a concentration of 90ppm.

[0030] Solution input and atomization Open the manual valve and slowly add the prepared Na2CO3 solution into nebulizer 1 at a flow rate of 5L per minute using the flow meter. Turn on nebulizer 1 and set its power to 500W to atomize the solution into tiny droplets and pass them into buffer tank 7.

[0031] Buffer tank parameter control Turn on heating wire 2 and use the temperature controller to maintain the temperature of buffer tank 7 at 90℃. Simultaneously, use the pressure regulating device to maintain the pressure inside buffer tank 7 at 15 mbar. Pressure gauge 5 displays the pressure value in real time, ensuring the pressure remains within the safe range.

[0032] Fabric and Additives The fabric feeding mechanism is activated, and the lifting cylinder 8 drives the fabric feeding hopper 10 to begin feeding fabric to each boat. When feeding begins, the PLC program receives a signal and controls the solenoid valve 4 to open. Atomized Na2CO3 solution is sprayed from the nozzle 3 to spray-dope the tungsten oxide in the fabric feeding hopper 10.

[0033] During the fabric application process, according to the preset PLC program, for the front area of ​​the boat, the solenoid valve 4 is controlled to open for 10 seconds, so that the tungsten oxide doping concentration in this area is 80ppm; for the middle area of ​​the boat, the solenoid valve 4 is controlled to open for 15 seconds, so that the doping concentration is 90ppm; for the rear area of ​​the boat, the solenoid valve 4 is controlled to open for 20 seconds, so that the doping concentration is 100ppm.

[0034] When the fabric feeding mechanism finishes feeding each boat, the PLC program controls solenoid valve 4 to close, and the spray mixing ends.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tungsten oxide doping device, characterized in that, The device includes a solution tank (9) and a fabric feeding mechanism. An atomizer (1) is installed below the solution tank (9). The output end of the atomizer (1) is connected to a buffer tank (7) through a pipe. A heating wire (2) is installed on the outside of the buffer tank (7). A nozzle (3) is installed on the output end of the buffer tank (7) through an intermediate pipe. A solenoid valve (4) is installed in series on the intermediate pipe. The fabric feeding mechanism includes a lifting cylinder (8). The drive rod of the lifting cylinder (8) is fixedly installed with a fabric hopper (10) through a bracket. The nozzle (3) is located on one side of the bottom of the fabric hopper (10).

2. The tungsten oxide doping device according to claim 1, characterized in that, A pressure gauge (5) is connected to the top of the buffer tank (7).

3. The tungsten oxide doping device according to claim 1, characterized in that, The heating wire (2) is located at the bottom of the buffer tank (7).

4. The tungsten oxide doping device according to claim 1, characterized in that, The bottom of the solution tank (9) is conical, and a manual valve is connected in series between the solution tank (9) and the atomizer (1).

5. The tungsten oxide doping device according to claim 1, characterized in that, A safety valve (6) is connected to the top of the buffer tank (7).

Images