A powder deoxidation purification device and method for metal injection molding

Abstract

The present application discloses a powder deoxidation purification device and method for metal injection molding, which belongs to the field of raw material pretreatment technology, and is used to provide a deoxidation purification device that can effectively improve the reduction effect and a method of using the device, including a bottom plate, a reaction chamber, a reducing agent supply mechanism and a raw material supply mechanism are arranged on the bottom plate, a temperature sensor is arranged in the reaction chamber, the raw material supply mechanism is suitable for injecting powdered metal and its oxide raw materials into the reaction chamber, the reducing agent supply mechanism is suitable for injecting gaseous reducing agent into the reaction chamber, the reaction chamber is suitable for stirring the solid raw material and the gaseous reducing agent to mix, and is suitable for pouring the reduced metal material into the drying device under the bottom plate. The present invention sets a rolling material barrel to allow the powdered metal and its oxide to roll and contact with the reducing agent, so that the oxide in the metal powder can fully contact with the reducing agent in a short time, thereby improving the reduction efficiency and effect.

Description

Technical Field

[0001] The present application relates to the technical field of raw material pretreatment, and in particular to a powder deoxidation and purification device and method for metal injection molding. Background Art

[0002] The metal powder added in the injection molding process has relatively high performance requirements, one of which is that it needs to have a high degree of cleanliness. However, powdered metals are easily oxidized and inevitably produce metal oxides. In order to reduce the oxide content in the metal powder used for injection molding, it needs to be reduced before use.

[0003] However, in traditional deoxygenation methods, the contact rate between the reducing agent and the metal oxide is low, the deoxygenation efficiency is not high, and it is difficult to ensure the reduction effect. Summary of the invention

[0004] The purpose of the present application is to provide a deoxidation purification device that can effectively improve the reduction effect and a method for using the device.

[0005] To achieve the above purpose, the present application provides a powder deoxidation and purification device for metal injection molding: comprising a bottom plate, a reaction chamber, a reducing agent supply mechanism and a raw material supply mechanism are arranged on the bottom plate, a temperature sensor is arranged in the reaction chamber, the raw material supply mechanism is suitable for injecting powdered metal and its oxide raw materials into the reaction chamber, the reducing agent supply mechanism is suitable for injecting gaseous reducing agent into the reaction chamber, the reaction chamber is suitable for stirring the solid raw material and the gaseous reducing agent to mix, and is suitable for pouring the reduced metal material into a drying device under the bottom plate, the bottom plate is provided with a clean material outlet, the drying device is arranged below the clean material outlet of the bottom plate, and a sealed opening and closing mechanism is arranged in the clean material outlet to prevent oxygen in the air from contacting with hydrogen during the reduction process;

[0006] An electric heating seat is arranged at the bottom of the reaction chamber, which is suitable for heating the raw materials entering the reaction chamber. A sealed chamber is also arranged on the bottom plate, and a humidity sensor is arranged in the sealed chamber. The reaction chamber, the reducing agent supply mechanism and the raw material supply mechanism are all located in the sealed chamber. A touch computer is arranged outside the sealed chamber, which is suitable for monitoring and controlling the reaction chamber, the reducing agent supply mechanism and the raw material supply mechanism to realize automatic control.

[0007] As a preferred embodiment, the reaction chamber includes a support frame fixedly connected to the bottom plate, a movable frame movably connected to the support frame, a swing drive is arranged outside the support frame, suitable for driving the movable frame to rotate relative to the support frame, a material barrel is rotatably connected inside the movable frame, a plurality of switching members equidistantly arranged around the axis are rotatably connected inside the material barrel, the rotation axis of each switching member is parallel to the axis of the material barrel, and a flywheel is rotatably connected outside the material barrel, suitable for using inertia to change the angle of the switching member relative to the material barrel, thereby allowing the material barrel to switch between receiving and discharging states.

[0008] Preferably, the reversing member includes a flat paddle plate, two ends of the paddle plate have coaxial rotating shafts, the ends of the two rotating shafts are fixedly connected with swing arms, the extension direction of the swing arms are located in the plane where the paddle plate is located, the two swing arms are fixedly connected with sliding shafts on opposite sides, and the two sliding shafts are coaxial; the main part of the material barrel is a mixing barrel, and the two ends of the mixing barrel have closing rings, the closing ring is provided with a plurality of rotating holes that pass through the inner and outer walls, and the plurality of rotating holes are equidistantly arranged around the axis of the closing ring, suitable for cooperating with the rotating shaft to form a rotating pair, the flywheel is provided with a plurality of radial sliding grooves equidistantly arranged around the axis, taking into account the sliding and rotating cooperation with the sliding shaft, and the end of the sliding shaft is fixedly connected with a retaining ring after passing through the radial sliding groove, so as to further improve the cooperation stability between the reversing member and the flywheel.

[0009] As a preferred embodiment, two flywheels are provided, which are respectively located at the two ends of the mixing barrel. The outer side surfaces at both ends of the mixing barrel are provided with coaxial outer sliding rings. The inner walls of the flywheels are provided with coaxial circumferential sliding grooves, which are suitable for cooperating with the outer sliding rings to form a rotating pair. Each of the flywheels is detachably clamped on the outer sliding ring; the inner wall of each closing ring is provided with an outward extension ring, which can improve the structural strength of the entire material barrel.

[0010] As a preferred embodiment, the movable frame includes a pair of swinging plates, each of the two vertical sides of the swinging plates has a side hanging plate, and a pair of parallel constraint rollers are rotatably connected between the same side hanging plates; the constraint roller includes a roller shaft, and both ends of the roller shaft have roller wheels, which are suitable for rolling contact with the outer side surface of the mixing barrel, and the end face of the roller wheel has a coaxial follower shaft, and each of the upper and lower ends of the side hanging plates is provided with an axial hole, which is suitable for cooperating with the follower shaft to form a rotating pair, thereby limiting the freedom of movement of the constraint roller.

[0011] As a preferred embodiment, the outer side surface of the mixing barrel is fixedly connected with an external gear, the upper ends of the two side hanging plates are commonly fixedly connected with a configuration plate, the configuration plate is provided with a through slot, a rotary drive is fixedly connected on the configuration plate, and the output end of the rotary drive is also fixedly connected with a gear, which meshes with the external gear at the through slot to ensure movement synchronization and improve action controllability.

[0012] As a preferred embodiment, the axial distance between adjacent constraint rollers is smaller than the outer diameter of the mixing barrel, the middle section of the roller has a coaxial annular groove suitable for engaging with the external gear, the swing drive includes an electric motor and a reducer fixedly connected to the outer side surface of the support frame, the outer side surface of the swing plate has a linkage shaft in the center, suitable for passing through the support frame and connecting with the output end of the reducer; the bottoms of the two swing plates are commonly fixedly connected to a bridge plate, the electric heating seat is located between the bridge plate and the mixing barrel, the bottom surface of the configuration plate has two sets of legs, which are respectively fixedly connected to the top surfaces of the two swing plates, so as to reduce consumables and reduce dead weight in pursuit of better lightweight.

[0013] As a preferred embodiment, the reducing agent supply mechanism includes a fixed sliding drive and a guide rail frame, and storage tanks are movably connected to the two guide rail frames. The reducing agent stored in the storage tanks is hydrogen, and the exhaust end of the storage tank is fixedly connected with an air supply pipe, which is suitable for being inserted into the reaction chamber, and the sliding drive is suitable for driving the storage tank to slide along the guide rail frame; the raw material supply mechanism includes a bracket fixedly connected to the bottom plate, and a slide is fixedly connected to the bracket, and the slide has a slideway, so that the powdered raw material can slide out from top to bottom under the action of its own gravity.

[0014] As a preferred embodiment, a guide groove is provided on the side of the guide rail frame, and the outer side surface of the storage tank has a guide strip suitable for cooperating with the guide groove to form a sliding pair, and the two ends of the guide rail frame are fixedly connected to the base plate through a support plate; the sliding drive includes a cylinder frame fixedly connected to the base plate, and a telescopic rod is fixedly connected to the cylinder frame. The outer side surface of the storage tank also has a traction plate, which is suitable for connecting to the movable end of the telescopic rod to obtain power for pushing and pulling movements.

[0015] The present application also provides a method for using the above-mentioned powder deoxidation and purification device for metal injection molding, comprising the following steps:

[0016] Step 1: Initialize the device, close the net material outlet, test the air tightness of the sealed cabin, extract the air in the sealed cabin, and place the air supply pipe outside the material barrel to avoid motion interference;

[0017] Step 2: Level the reaction chamber. The swing drive drives the movable frame to adjust the axis of the material barrel to a horizontal level, which is conducive to spreading the material in the material barrel and making full use of the inner surface area of ​​the material barrel;

[0018] Step 3: Start the reaction chamber, the rotary drive drives the material barrel to rotate faster, the flywheel forces all the reversing parts to deflect synchronously due to its own inertia, and the inclination angle of the paddle relative to the inner wall of the mixing barrel changes until the rotation speed of the material barrel reaches the set value and stabilizes. The inclination angles of all the paddles relative to the inner wall of the mixing barrel are unified, and the functions are the same. The common center of gravity of all the paddles is located on the axis of the mixing barrel, and the material barrel will be more stable when rotating;

[0019] Step 4: Add raw materials. Powdered metals and their oxides slide out from the slideway of the raw material supply mechanism and are cut into the material barrel by the inclined and rotating paddle. The raw materials stick to the inner wall of the mixing barrel. The raw materials are located on the side of the paddle facing the inner wall of the mixing barrel. Due to their own gravity, the raw materials will continue to surge on the inner wall of the mixing barrel, which can improve the contact efficiency with the reducing agent.

[0020] Step 5: Heat the raw materials. Determine the temperature suitable for the reduction reaction according to the type of oxides contained in the metal powder. Start the electric heating seat to heat the raw materials until the temperature sensor detects that the raw materials have reached a suitable temperature. Maintaining the temperature is not only a condition for stimulating the reduction reaction, but also the key to maintaining the reaction rate.

[0021] Step 6: Add reducing agent, the air supply pipe is driven by the telescopic rod to penetrate into the material barrel, the end of the air supply pipe is perpendicular to the inner wall of the mixing barrel, the valve of the storage tank is opened to inject reducing gas into the material barrel through the air supply pipe, and the hydrogen gas is closely attached to the inner wall of the material barrel under the cutting action of the inclined plate, and fully contacts with the turning powdered raw materials, which can effectively improve the deoxidation efficiency;

[0022] Step 7: Cut off the supply of reducing agent. When the humidity sensor detects that the humidity in the sealed cabin is no longer increasing, the storage tank stops supplying air, and the air supply pipe is completely withdrawn from the material barrel. At this time, the metal material in the material barrel has been reduced, and because of the moisture, it has agglomerated and adhered to the inner wall of the mixing barrel, and will not scatter everywhere, which is convenient for discharge and cleaning;

[0023] Step 8: Adjust the tilt of the reaction chamber. The material barrel gradually tilts under the drive of the swing drive, so that the end of the material barrel facing the net material outlet faces downward. The wet material on the inner wall of the material barrel will partially gather at the lower end of the material barrel. At this time, because the material agglomerates are relatively loose, it has no effect on the reduction work.

[0024] Step 9: Discharge the reduced metal material and stop the rotary drive quickly. The rotating material barrel will stop as well. Due to the inertia of the flywheel, the reversing member will be forced to deflect in the other direction. When the rotating paddle is perpendicular to the inner wall of the mixing barrel, the distance between the side of the paddle and the inner wall of the mixing barrel is the smallest, which will cut the wet material blocks on the inner wall of the material barrel into strips and slide to the side of the paddle facing away from the inner wall of the mixing barrel. Then the rotary drive starts slowly and continues to rotate forward with the material barrel. At this time, the paddle is pressed by the wet material blocks and maintains an inclination angle relative to the inner wall of the material barrel. The flywheel can obtain sufficient torque and rotate synchronously with the material barrel. The wet material blocks slide along the side of the paddle facing away from the mixing barrel, and slide out of the material barrel from the lower extension ring under the action of their own gravity, and finally accumulate near the net material outlet. Since the air pressure inside the sealed cabin is greater than the external air pressure, when the net material outlet is opened, the strong air pressure difference will quickly flush the wet material out of the net material outlet and enter the drying device below, thereby removing moisture from the material.

[0025] Step 10: Dry the reduced metal material until it is completely dry, return to the first step, reset it and repeat the next round of reduction work.

[0026] Compared with the prior art, the beneficial effects of this application are:

[0027] (1) By setting a rolling material barrel, the powdered metal and its oxides are rolled to contact the reducing agent, which increases the contact rate of the reducing agent and the deoxidation rate. In addition, the oxides in the metal powder are fully in contact with the reducing agent in a short time, so the reduction efficiency and effect are effectively improved;

[0028] (2) By setting a reversing structure with a paddle in the material barrel and using the inertia of the flywheel to make the paddle act on the material, rapid and automatic loading and unloading of materials can be achieved, further shortening the time consumption of the deoxidation operation and improving the efficiency of the deoxidation reduction work;

[0029] (3) Due to the shielding effect of the paddle and the centrifugal effect generated by the rotation of the material barrel, the powdered raw materials entering the reaction chamber can adhere to the inside of the material barrel. Even if it moves at high speed, it will not splash everywhere, and the sealed chamber can remain clean for a long time;

[0030] (4) Since the pressure inside the sealed cabin is high after the reduction reaction is completed, the materials on the bottom plate will be blown out from the net material outlet by the strong air pressure at the moment of releasing the seal. There is no accumulation of materials and no need for secondary cleaning. Therefore, the device is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a functional structural layout diagram of the powder deoxidation and purification device for metal injection molding.

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the reaction chamber of the powder deoxidation and purification device for metal injection molding.

[0033] Figure 3 This is a schematic diagram of the three-dimensional structure of the reaction chamber of the powder deoxidation and purification device for metal injection molding after the support frame is removed.

[0034] Figure 4 It is a three-dimensional structural schematic diagram of the coordination between the movable frame and the material barrel of the powder deoxidation and purification device for metal injection molding.

[0035] Figure 5 It is a schematic diagram of the three-dimensional structure of the cooperation between the restraining roller and the material barrel of the powder deoxidation and purification device for metal injection molding.

[0036] Figure 6 It is a three-dimensional structural cross-sectional view of the material barrel of the powder deoxidation and purification device for metal injection molding.

[0037] Figure 7 It is a schematic diagram of the three-dimensional structure of the switching member of the powder deoxidation and purification device for metal injection molding.

[0038] Figure 8 It is a three-dimensional structural cross-sectional view of the flywheel of the powder deoxidation and purification device for metal injection molding.

[0039] Fig. 9 This is a schematic diagram of the three-dimensional structure of the restraining roller of the powder deoxidation and purification device for metal injection molding.

[0040] Fig.10 It is a three-dimensional schematic diagram of the partial structure of the movable frame of the powder deoxidation and purification device used for metal injection molding.

[0041] Fig.11 It is a schematic diagram of the three-dimensional structure of the electric heating base and the movable frame connected to the powder deoxidation and purification device for metal injection molding.

[0042] Fig.12 It is a schematic diagram of the three-dimensional structure of the swing plate and the rotary drive of the powder deoxidation and purification device for metal injection molding.

[0043] Fig.13 This is the first perspective view of the reducing agent supply mechanism of the powder deoxidation and purification device for metal injection molding.

[0044] Fig.14 This is the second perspective view of the reducing agent supply mechanism of the powder deoxidation and purification device for metal injection molding.

[0045] Fig.15It is a three-dimensional structural schematic diagram of the raw material supply mechanism of the powder deoxidation and purification device for metal injection molding.

[0046] Fig.16 It is a three-dimensional schematic diagram of the packaging state of the powder deoxidation and purification device for metal injection molding.

[0047] Fig.17 The present invention is a control flow chart of the method for using the powder deoxidation purification device for metal injection molding.

[0048] In the figure: 1, bottom plate; 101, net material outlet; 2, reaction chamber; 210, support frame; 220, movable frame; 221, bridge plate; 222, configuration plate; 223, swing plate; 224, side hanging plate; 225, linkage shaft; 226, shaft hole; 227, support leg; 228, through slot; 230, swing drive; 231, motor; 232, reducer; 240, rotation drive; 250, material barrel; 251, mixing barrel; 252, external gear; 253, closing ring; 254, extension ring; 255, external sliding ring; 256, rotating hole; 260, reversing member; 261, dial plate; 262, rotating shaft; 263, swing arm; 264. Sliding shaft; 265. Retaining ring; 270. Flywheel; 271. Circumferential slide groove; 272. Radial slide groove; 280. Electric heating seat; 290. Constraint roller; 291. Roller shaft; 292. Roller; 293. Ring groove; 294. Follower shaft; 3. Reductant supply mechanism; 310. Air supply pipe; 320. Storage tank; 321. Traction plate; 322. Guide strip; 330. Sliding drive; 331. Cylinder frame; 332. Telescopic rod; 340. Guide rail frame; 341. Support plate; 342. Guide groove; 4. Raw material supply mechanism; 401. Bracket; 402. Slide; 403. Slideway; 5. Sealed cabin; 6. Touch computer. DETAILED DESCRIPTION

[0049] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0050] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0051] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0052] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0053] like Figure 1-16 The powder deoxidation and purification device for metal injection molding shown in the figure comprises a fixedly arranged bottom plate 1, on which are arranged three main functional mechanisms: a reaction chamber 2, a reducing agent supply mechanism 3 and a raw material supply mechanism 4. The raw material supply mechanism 4 is used to inject powdered metal and its oxide raw materials into the reaction chamber 2. The raw material supply mechanism 4 comprises a bracket 401 fixedly connected to the bottom plate 1, on which is fixedly connected a slide 402. A raw material bin is usually arranged at the upper end of the slide 402 for storing more powdered raw materials. This is a conventional setting. When actually used, it is selected as needed. It will not be shown or introduced here. The slide 402 has a slide 403, which is continuous and inclined. The powdered metal and The oxide can slide smoothly from the upper end to the lower end of the slideway 403, and the raw material is transported from the raw material bin to the reaction chamber 2. An electric heating seat 280 is arranged at the bottom of the reaction chamber 2. By utilizing the electrothermal effect, the powdered raw material entering the reaction chamber 2 can be efficiently heated. The target temperature of heating is set according to the type of raw material. For example, if the object of reduction is manganese dioxide, the electric heating seat 280 does not need to be started, and it can be carried out at room temperature as long as the concentration of hydrogen is sufficient; if the object is iron oxide, the temperature needs to reach 100~200°C; if it is copper oxide, the temperature needs to be set within the range of 600~800°C; titanium dioxide and the like can also be reduced with hydrogen, which will not be introduced one by one here.

[0054] The reducing agent supply mechanism 3 is used to inject gaseous reducing agent into the reaction chamber 2. The reducing agent supply mechanism 3 includes a fixed sliding drive 330 and a guide rail frame 340. The two guide rail frames 340 are movably connected with a storage tank 320. The reducing agent stored in the storage tank 320 is hydrogen. Therefore, the storage tank 320 is a high-pressure resistant gas storage tank. The exhaust end of the storage tank 320 is fixedly connected with an air supply pipe 310. An electric control valve structure is arranged inside the exhaust end of the storage tank 320, which can be controlled by a computer to realize automatic exhaust and air sealing. The air supply pipe 310 can be inserted into the reaction chamber 2 under the drive of the sliding drive 330. In fact, the sliding drive 330 will directly drive the storage tank 320 to slide along the guide rail frame 340, so as to adjust the position of the air supply pipe 310 relative to the reaction chamber 2. A straight guide groove 342 is provided on the side of the guide rail frame 340. The outer surface of the storage tank 320 There is a straight guide bar 322, which cooperates with the guide groove 342 to form a sliding pair, which limits the freedom of movement of the storage tank 320 and improves the movement stability of the storage tank 320. There is a pair of guide rail frames 340, and both ends of the two guide rail frames 340 are fixedly connected to the base plate 1 through support plates 341, thereby ensuring the stability of the guide rail frames 340; the sliding drive 330 includes a cylinder frame 331 fixedly connected to the base plate 1, and a telescopic rod 332 is fixedly connected to the cylinder frame 331. The telescopic rod 332 can be an electric type with higher control accuracy, or a pneumatic type with lower cost and only two length states. Most of the time, a cylinder can meet the working requirements. The outer side of the storage tank 320 also has a traction plate 321 for connecting to the movable end of the telescopic rod 332. The traction plate 321 is usually located at the bottom of the storage tank 320 and can be well hidden, thereby reducing movement interference.

[0055] A temperature sensor is provided in the reaction chamber 2 for detecting the temperature of the material in the reaction chamber 2. After the detected signal is fed back to the computer, the computer can control the output power of the electric heating seat 280 to change the temperature in the reaction chamber 2, thereby realizing closed-loop control. The reaction chamber 2 includes a support frame 210 fixedly connected to the bottom plate 1, and a movable frame 220 is movably connected to the support frame 210. A swing drive 230 is provided outside the support frame 210 for driving the movable frame 220 to rotate relative to the support frame 210. A material barrel 250 is rotatably connected inside the movable frame 220, and a plurality of commutating members 260 equidistantly arranged around the axis are rotatably connected inside the material barrel 250. The rotation axis of each commutating member 260 is parallel to the axis of the material barrel 250. A flywheel 270 is also rotatably connected outside the material barrel 250. The flywheel 270 is solid and has a large mass. Its own inertia can be used to change the angle of the commutating member 260 relative to the material barrel 250.

[0056] Specifically, the reversing member 260 includes a flat plate 261. In fact, the cross section of the plate 261 is a flat ellipse. The two ends of the plate 261 have coaxial rotating shafts 262. In general, the rotating shafts 262 are located at the geometric center of the elliptical end surface of the plate 261 and are colinear with the axis of the ellipse. The ends of the two rotating shafts 262 are fixedly connected with swing arms 263. The extension direction of the swing arms 263 is located in the plane where the plate 261 is located, that is, the directions extending from the ends of the rotating shafts 262 are parallel and the same. Therefore, the two swing arms 263 have opposite side surfaces. The two swing arms 263 are fixedly connected with sliding shafts 264 on the opposite side surfaces. The two sliding shafts 264 are also coaxial. The main body of the material barrel 250 The body of the mixing barrel 251 is cylindrical, and both ends of the mixing barrel 251 are provided with closing rings 253. Both ends of the paddle 261 are very close to the inner wall of the closing ring 253, so the closing ring 253 can effectively inhibit the movement of the paddle 261. The closing ring 253 is provided with a plurality of rotating holes 256 that pass through the inner and outer walls. The plurality of rotating holes 256 are equidistantly arranged around the axis of the closing ring 253, and the number corresponds to the reversing member 260, which is used to cooperate with the rotating shaft 262 to form a rotating pair. The two closing rings 253 can well limit the freedom of movement of the reversing member 260. Two flywheels 270 are also provided, which are respectively located at the two ends of the mixing barrel 251. The flywheel 270 is provided with a plurality of radial sliding grooves 272 equidistantly arranged around the axis, taking into account the sliding The sliding and rotating cooperation of the shaft 264 can make the reversing member 260 swing within a certain range under the relative movement of the closing ring 253 and the flywheel 270. The end of the sliding shaft 264 is fixedly connected with the retaining ring 265 after passing through the radial sliding groove 272, which further improves the stability of the cooperation between the sliding shaft 264 and the flywheel 270, and the smoothness of the movement of the sliding shaft 264 relative to the flywheel 270. In order to further improve the temperature resistance of the flywheel 270 relative to the material barrel 250, the outer side surfaces of both ends of the mixing barrel 251 are also provided with coaxial outer sliding rings 255. Correspondingly, the inner walls of the two flywheels 270 are provided with coaxial circumferential sliding grooves 271, which just cooperate with the outer sliding ring 255 to form a rotating pair. Because of this cooperation, There is interference in the combination, and it cannot be achieved directly, so each flywheel 270 is designed to be detachably stuck on the outer sliding ring 255. For example, each flywheel 270 is divided into two at the circumferential sliding groove 271, and after being put on the outer sliding ring 255 outside the mixing barrel 251, it is connected as a whole by welding or bolting. The same is true for the switching member 260 with a more complex three-dimensional structure. It is first split into multiple mating parts, and then the parts are connected in a traditional way after the mating is completed; the inner wall of each closing ring 253 has an outward extension ring 254, and the material can slide in or out along the inner wall of the extension ring 254. At the same time, the extension ring 254 can improve the deformation resistance of the entire material barrel 250 made of alloy material.

[0057] The movable frame 220 includes a pair of swing plates 223, and each swing plate 223 has a side hanging plate 224 on both vertical sides. A pair of parallel constraint rollers 290 are rotatably connected between the same side hanging plate 224, and the two constraint rollers 290 are respectively close to the upper and lower ends of the side hanging plate 224; the specific structure of the constraint roller 290 includes a roller shaft 291, and the two ends of the roller shaft 291 have coaxial rollers 292, which are used to roll with the outer side of the mixing barrel 251, so as to provide constraint and support for the material barrel 250, and the end surface of the roller 292 has a coaxial follower shaft 294, and the upper and lower ends of each side hanging plate 224 are provided with an axis hole 226, which just cooperates with the follower shaft 294 to form a rotating pair, because the roller 292 Due to the blocking effect of the end face, the entire constraint roller 290 will not swing significantly relative to the side hanging plate 224. The outer side surface of the mixing barrel 251 is fixedly connected to the external gear 252. There are also two external gears 252, which are fixed to the outer side surface of the mixing barrel 251 by welding. The upper ends of the two side hanging plates 224 are commonly fixedly connected to the configuration plate 222, which can maintain the relative distance between the upper ends of the two side hanging plates 224. The configuration plate 222 is provided with a through slot 228, and the external gear 252 can protrude from the through slot 228. The configuration plate 222 is fixedly connected to the rotary drive 240, and the output end of the rotary drive 240 is also fixedly connected to a gear, which meshes with the external gear 252 at the through slot 228, thereby driving the material barrel 250 to rotate.

[0058] It should be noted that the axial distance between adjacent constraint rollers 290 is smaller than the outer diameter of the mixing barrel 251, so that the material barrel 250 will not slip out from between any pair of constraint rollers 290. Usually, four constraint rollers 290 are provided, and the four constraint rollers 290 are arranged equidistantly around the axis of the material barrel 250. The four constraint rollers 290 can ensure the installation stability of the material barrel 250. The middle section of the roller 292 has a coaxial annular groove 293, which just meshes with the external gear 252, further improving the constraint degree of the constraint roller 290 on the material barrel 250, so that the material barrel 250 will be more stable when rotating. The swing drive 230 includes a motor 231 and a reducer 232 fixedly connected to the outer side of the support frame 210. The motor 231 is used to drive the reducer 232, and the reducer 232 reduces the output speed and increases the output Torque and stability, a linkage shaft 225 is provided in the center of the outer side surface of the swing plate 223, which can pass through the support frame 210 and be connected to the output end of the reducer 232, and the linkage shaft 225 rotates relative to the support frame 210 through the bearing structure; the bottoms of the two swing plates 223 are fixedly connected with a bridge plate 221 to ensure the stability of the spacing between the lower ends of the two swing plates 223, and the electric heating seat 280 is located between the bridge plate 221 and the mixing barrel 251. The bridge plate 221 is made of heat-insulating material, which can prevent heat loss and thus reduce the energy consumption of the electric heating seat 280. The bottom surface of the configuration plate 222 has two sets of legs 227, which are fixedly connected to the top surfaces of the two swing plates 223 respectively, while ensuring that the configuration plate 222 has a higher top surface, it reduces consumables and reduces its own weight, so that the entire movable frame 220 has better lightweight.

[0059] The reaction chamber 2 with a rotating material barrel 250 can stir the solid raw material and the gaseous reducing agent to mix, and can pour the reduced metal material into the drying device under the bottom plate 1. The bottom plate 1 is provided with a clean material outlet 101 that passes through the upper and lower end surfaces. The drying device is arranged below the clean material outlet 101 of the bottom plate 1. A sealed opening and closing mechanism is also arranged in the clean material outlet 101. The opening and closing mechanism is actually a plate valve mechanism with good sealing performance. It belongs to mature existing technology and can be directly selected in existing products. It does not belong to the protection points and will not be displayed and introduced here. A sealed cabin 5 is also arranged on the bottom plate 1. When the plate valve mechanism is closed, The sealed cabin 5 will be completely sealed. A humidity sensor is arranged in the sealed cabin 5 to detect humidity changes in the internal environment. The reaction cabin 2, the reducing agent supply mechanism 3 and the raw material supply mechanism 4 are all located in the sealed cabin 5. Usually, some transparent windows are arranged on the sealed cabin 5 to facilitate the staff outside the sealed cabin 5 to observe the working status of the internal mechanisms of the sealed cabin 5. A touch computer 6 is arranged outside the sealed cabin 5 to monitor and control the reaction cabin 2, the reducing agent supply mechanism 3 and the raw material supply mechanism 4. Parameters can be set on the touch computer 6, and the working progress can be clearly seen. It is an important equipment for realizing human-computer interaction and automatic control.

[0060] like Fig.17 The working control flow of the powder deoxidation and purification device for metal injection molding shown in the figure is as follows: first, the device is initialized, the opening and closing mechanism in the net material outlet 101 is closed, the net material outlet 101 is sealed, the air tightness of the sealed cabin 5 is detected, and after confirming that the air tightness is good, the air in the sealed cabin 5 is evacuated, and the telescopic rod 332 is controlled to allow the air supply pipe 310 to be located outside the material barrel 250; then the reaction cabin 2 is leveled, and the swing drive 230 is started to drive the movable frame 220 to adjust the axis of the material barrel 250 to the horizontal; the reaction cabin 2 can be started, and the rotation drive 240 drives the material barrel 250 to accelerate the rotation. Due to its own inertia, the flywheel 270 forces all the reversing members 260 to deflect synchronously, and the inclination angle of the paddle 261 relative to the inner wall of the mixing barrel 251 changes until the rotation speed of the material barrel 250 reaches the set value and stabilizes. At this time, the flywheel 270 and the material barrel 250 are synchronized, and the inclination angles of all the paddles 261 relative to the inner wall of the mixing barrel 251 are also uniform;

[0061] Then, the raw materials are added. The powdered metal and its oxides slide out from the slide 403 of the raw material supply mechanism 4 and are cut into the material barrel 250 by the inclined and rotating paddle 261. The raw materials are gradually accelerated by the friction force. The centrifugal force makes the raw materials stick to the inner wall of the mixing barrel 251. The raw materials are located on the side of the paddle 261 facing the inner wall of the mixing barrel 251. Under the action of centrifugal force, the raw materials will not fly over the paddle 261 and scatter everywhere. Due to the action of its own gravity, the raw materials will continue to surge on the inner wall of the mixing barrel 251, which plays a stirring role. The raw materials can contact and react with the reducing agent more efficiently. Then, the raw materials are heated, and the temperature suitable for the reduction reaction is determined according to the type of oxides contained in the metal powder. The electric heating seat 280 is started to heat the raw materials until the temperature sensor detects that the raw materials have reached a suitable temperature. Then the reducing agent can be added and air is delivered. Driven by the telescopic rod 332, the tube 310 is inserted into the material barrel 250, and the end of the air supply pipe 310 is perpendicular to the inner wall of the mixing barrel 251. The valve of the storage tank 320 is opened to inject reducing gas into the material barrel 250 through the air supply pipe 310. Similarly, under the cutting action of the inclined plate 261, the hydrogen gas is close to the inner wall of the material barrel 250, and is in full contact with the turned powdered raw materials, and combines with the oxygen element of the metal oxide in the powder to generate water. Most of the generated water will diffuse into the surrounding environment, causing the environmental humidity to drop rapidly, and a small part will be directly adsorbed on the solid powder, which will cause the powder to form an unstable block, thereby reducing the fluidity of the powder. Gravity makes it more difficult for the agglomerated powder to detach from the inner wall of the material barrel 250, so the well-reduced and moist material can be more firmly attached to the inner wall of the material barrel 250.

[0062] When the humidity sensor detects that the humidity in the sealed cabin 5 is no longer increasing, it means that the metal oxides in the metal material in the material barrel 250 have been completely reduced, and the supply of reducing agent can be cut off, the electric control valve of the storage tank 320 is closed, the air supply is stopped, the telescopic rod 332 is retracted, and the air supply pipe 310 is completely withdrawn from the material barrel 250 to avoid interference with the movable reaction chamber 2 during discharge, and all the materials are clumped together due to moisture and are closely attached to the inner wall of the mixing barrel 251; the reaction chamber 2 is tilted, and the material barrel 250 is gradually tilted under the drive of the swing drive 230, so that the end of the material barrel 250 facing the net material outlet 101 is downward, and the inclination angle can reach 60°. At this time, the material remains in a close state, because the material agglomerates are not firm and are easy to loosen, so part of the wet material on the inner wall of the material barrel 250 will gather toward the lower end of the material barrel 250, but it has no effect on the working process;

[0063] The reduced metal material is discharged and the rotary drive 240 is stopped quickly. Due to the large acceleration, the rotary drive 240 needs to bear a large reverse load. Like the swing drive 230, the rotary drive 240 also has a deceleration structure linked to the electric motor, which can effectively reduce the load transmitted to the motor. Due to the meshing relationship, the rotating material barrel 250 will stagnate, and the flywheel 270 with large inertia will force the reversing member 260 to deflect in the other direction. When the rotating paddle 261 is perpendicular to the inner wall of the mixing barrel 251, the distance between the side of the paddle 261 and the inner wall of the mixing barrel 251 is the smallest, which will cut the wet material blocks on the inner wall of the material barrel 250 into strips and peel them off from the inner wall of the material barrel 250, sliding to the side of the paddle 261 facing away from the inner wall of the mixing barrel 251; then the rotary drive 240 starts slowly, and the material barrel 250 continues to move. Continue forward rotation. At this time, since the paddle 261 is pressed by the wet material block and maintains the tilt angle relative to the inner wall of the material barrel 250, the flywheel 270 can obtain sufficient torque and rotate synchronously with the material barrel 250. The wet material block slides along the paddle 261 away from the side of the mixing barrel 251, and slides out of the material barrel 250 from the lower extension ring 254 under the action of its own gravity, and finally accumulates near the net material outlet 101. Since the storage tank 320 continues to supply air to the outside, when the reaction is completed, the air pressure inside the sealed cabin 5 will be greater than the external air pressure. When the net material outlet 101 is opened, the strong air pressure difference will quickly flush the wet material together with the water vapor out of the net material outlet 101 and into the drying device below; the drying device will dry the reduced metal material until the material is completely dry, and then return to the initial step and reset to perform the next round of reduction work.

[0064] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A powder deoxidation and purification device for metal injection molding, characterized in that: The invention comprises a bottom plate (1), wherein a reaction chamber (2), a reducing agent supply mechanism (3) and a raw material supply mechanism (4) are arranged on the bottom plate (1), wherein a temperature sensor is arranged in the reaction chamber (2), wherein the raw material supply mechanism (4) is suitable for injecting powdered metal and its oxide raw materials into the reaction chamber (2), wherein the reducing agent supply mechanism (3) is suitable for injecting gaseous reducing agent into the reaction chamber (2), wherein the reaction chamber (2) is suitable for stirring the solid raw materials and the gaseous reducing agent to mix, and is suitable for pouring the reduced metal materials into a drying device below the bottom plate (1), wherein the bottom plate (1) is provided with a net material outlet (101), wherein the drying device is arranged below the net material outlet (101) of the bottom plate (1), and wherein a sealed opening and closing mechanism is arranged in the net material outlet (101); The reaction chamber (2) comprises a support frame (210) fixedly connected to the bottom plate (1); a movable frame (220) is movably connected to the support frame (210); a swing drive (230) is arranged outside the support frame (210) and is suitable for driving the movable frame (220) to rotate relative to the support frame (210); a material barrel (250) is rotatably connected inside the movable frame (220); a plurality of reversing members (260) equidistantly arranged around an axis are rotatably connected inside the material barrel (250); and a rotation axis of each reversing member (260) is parallel to the axis of the material barrel (250). The material barrel (250) is rotatably connected to a flywheel (270) outside and is suitable for using inertia to change the angle of the reversing member (260) relative to the material barrel (250). The reversing member (260) comprises a flat dial plate (261). Both ends of the dial plate (261) have coaxial rotating shafts (262). The ends of the two rotating shafts (262) are fixedly connected to swing arms (263). The extending direction of the swing arms (263) is located in the plane where the dial plate (261) is located. The two swing arms (263) are fixedly connected to sliding shafts (264) on opposite sides. The two sliding shafts (264) are fixedly connected to the two sliding shafts (264). The main body of the material barrel (250) is a mixing barrel (251), and both ends of the mixing barrel (251) have closing rings (253). The closing ring (253) is provided with a plurality of rotating holes (256) penetrating the inner and outer walls. The plurality of rotating holes (256) are equidistantly arranged around the axis of the closing ring (253), and are suitable for cooperating with the rotating shaft (262) to form a rotating pair. The flywheel (270) is provided with a plurality of radial sliding grooves (272) equidistantly arranged around the axis, so as to achieve both sliding cooperation and rotation cooperation with the sliding shaft (264). After the end passes through the radial slide groove (272), it is fixedly connected to a retaining ring (265). Two flywheels (270) are provided, which are respectively located at the two ends of the mixing barrel (251). The outer side surfaces at both ends of the mixing barrel (251) have coaxial outer slide rings (255). The inner wall of the flywheel (270) has a coaxial circumferential slide groove (271) suitable for cooperating with the outer slide ring (255) to form a rotating pair. Each flywheel (270) is detachably clamped on the outer slide ring (255); the inner wall of each closing ring (253) has an outward extension ring (254); The bottom of the reaction chamber (2) is provided with an electric heating seat (280) suitable for heating the raw materials entering the reaction chamber (2); the bottom plate (1) is also provided with a sealed chamber (5), a humidity sensor is provided in the sealed chamber (5); the reaction chamber (2), the reducing agent supply mechanism (3) and the raw material supply mechanism (4) are all located in the sealed chamber (5); a touch-screen computer (6) is provided outside the sealed chamber (5) suitable for monitoring and controlling the reaction chamber (2), the reducing agent supply mechanism (3) and the raw material supply mechanism (4).

2. The powder deoxidation and purification device for metal injection molding according to claim 1, characterized in that: The movable frame (220) comprises a pair of swing plates (223), and both vertical sides of the swing plates (223) are provided with side hanging plates (224). A pair of parallel constraint rollers (290) are rotatably connected between the same side hanging plates (224); the constraint rollers (290) comprise roller shafts (291), and both ends of the roller shafts (291) are provided with roller wheels (292) suitable for rolling contact with the outer side surface of the mixing barrel (251), and the end surface of the roller wheel (292) is provided with a coaxial follower shaft (294); and each of the upper and lower ends of the side hanging plates (224) is provided with an axis hole (226) suitable for cooperating with the follower shaft (294) to form a rotating pair.

3. The powder deoxidation and purification device for metal injection molding according to claim 2, characterized in that: An external gear (252) is fixedly connected to the outer side surface of the mixing barrel (251); a configuration plate (222) is fixedly connected to the upper ends of the two side hanging plates (224); a through slot (228) is formed in the configuration plate (222); a rotary drive (240) is fixedly connected to the configuration plate (222); a gear is also fixedly connected to the output end of the rotary drive (240), and meshes with the external gear (252) at the through slot (228).

4. The powder deoxidation and purification device for metal injection molding according to claim 3, characterized in that: The axial distance between adjacent constraining rollers (290) is smaller than the outer diameter of the mixing barrel (251); the middle section of the roller (292) has a coaxial annular groove (293) suitable for meshing with the external gear (252); the swing drive (230) comprises a motor (231) and a reducer (232) fixedly connected to the outer side surface of the support frame (210); the outer side surface of the swing plate (223) has a linkage shaft (225) in the center, suitable for passing through the support frame (210) and connecting to the output end of the reducer (232); the bottoms of the two swing plates (223) are fixedly connected to a bridge plate (221); the electric heating seat (280) is located between the bridge plate (221) and the mixing barrel (251); the bottom surface of the configuration plate (222) has two groups of legs (227) fixedly connected to the top surfaces of the two swing plates (223) respectively.

5. The powder deoxidation and purification device for metal injection molding according to any one of claims 1 to 4, characterized in that: The reducing agent supply mechanism (3) comprises a fixedly arranged sliding drive (330) and a guide rail frame (340), two guide rail frames (340) are movably connected to a storage tank (320), the reducing agent stored in the storage tank (320) is hydrogen, an exhaust end of the storage tank (320) is fixedly connected to an air supply pipe (310) suitable for being inserted into the reaction chamber (2), and the sliding drive (330) is suitable for driving the storage tank (320) to slide along the guide rail frame (340); the raw material supply mechanism (4) comprises a bracket (401) fixedly connected to the bottom plate (1), a slide (402) is fixedly connected to the bracket (401), and a slide (403) is provided on the slide (402).

6. The powder deoxidation and purification device for metal injection molding according to claim 5, characterized in that: A guide groove (342) is provided on the side of the guide rail frame (340); the outer side surface of the storage tank (320) has a guide strip (322) suitable for cooperating with the guide groove (342) to form a sliding pair; both ends of the guide rail frame (340) are fixedly connected to the bottom plate (1) via a support plate (341); the sliding drive (330) comprises a cylinder frame (331) fixedly connected to the bottom plate (1); a telescopic rod (332) is fixedly connected to the cylinder frame (331); and the outer side surface of the storage tank (320) also has a traction plate (321) suitable for connecting to the movable end of the telescopic rod (332).

7. A method for using the powder deoxidation and purification device for metal injection molding according to claim 6, characterized in that: The following steps are involved: S1. The device is initialized, the net material outlet (101) is closed, the air tightness of the sealed cabin (5) is detected, the air in the sealed cabin (5) is extracted, and the air supply pipe (310) is located outside the material barrel (250); S2. Leveling the reaction chamber (2), the swing drive (230) drives the movable frame (220) to adjust the axis of the material barrel (250) to a horizontal level; S3. The reaction chamber (2) is started, and the rotation drive (240) drives the material barrel (250) to rotate faster. Due to its own inertia, the flywheel (270) forces all the reversing members (260) to deflect synchronously, and the inclination angle of the paddle (261) relative to the inner wall of the mixing barrel (251) changes until the rotation speed of the material barrel (250) reaches a set value and stabilizes, and the inclination angles of all the paddles (261) relative to the inner wall of the mixing barrel (251) are uniform; S4. Add raw materials, the powdered metal and its oxide slide out from the slideway (403) of the raw material supply mechanism (4), and are cut into the material barrel (250) by the inclined and rotating paddle (261), the raw materials are attached to the inner wall of the mixing barrel (251), and the raw materials are located on the side of the paddle (261) facing the inner wall of the mixing barrel (251). Due to the effect of its own gravity, the raw materials will continue to surge on the inner wall of the mixing barrel (251); S5. Heating the raw material, determining a suitable temperature for the reduction reaction according to the type of oxide contained in the metal powder, and starting the electric heating seat (280) to heat the raw material until the temperature sensor detects that the raw material reaches a suitable temperature; S6. Add the reducing agent, the air supply pipe (310) is driven by the telescopic rod (332) to penetrate into the material barrel (250), the end of the air supply pipe (310) is perpendicular to the inner wall of the mixing barrel (251), the valve of the storage tank (320) is opened to inject reducing gas into the material barrel (250) through the air supply pipe (310), and the hydrogen gas is closely attached to the inner wall of the material barrel (250) under the cutting action of the inclined plate (261), and is fully in contact with the turning powdered raw material; S7. Cut off the supply of reducing agent. When the humidity sensor detects that the humidity in the sealed cabin (5) is no longer increasing, the storage tank (320) stops supplying air, and the air supply pipe (310) is completely withdrawn from the material barrel (250). At this time, the metal material in the material barrel (250) has been reduced and has agglomerated and adhered to the inner wall of the mixing barrel (251) due to moisture. S8. The reaction chamber (2) is tilted, and the material barrel (250) is gradually tilted under the drive of the swing drive (230), so that the end of the material barrel (250) facing the clean material outlet (101) is downward, and part of the wet material on the inner wall of the material barrel (250) is gathered at the lower end of the material barrel (250); S9. The reduced metal material is discharged, and the rotary drive (240) is quickly stopped. The rotating material barrel (250) will stop as well. Due to the inertia of the flywheel (270), the reversing member (260) will be forced to deflect in another direction. When the rotating paddle (261) is perpendicular to the inner wall of the mixing barrel (251), the distance between the side of the paddle (261) and the inner wall of the mixing barrel (251) is the smallest. The wet material blocks on the inner wall of the material barrel (250) will be cut into strips and slide to the side of the paddle (261) facing away from the inner wall of the mixing barrel (251). Then, the rotary drive (240) is slowly started, and the material barrel (250) continues to rotate forward. The plate (261) is pressed by the wet material block and maintains an inclined angle relative to the inner wall of the material barrel (250). The flywheel (270) can obtain sufficient torque and rotate synchronously with the material barrel (250). The wet material block slides along the side of the paddle plate (261) facing away from the mixing barrel (251) and slides out of the material barrel (250) from the lower extension ring (254) under the action of its own gravity, and finally accumulates near the net material outlet (101). Since the internal air pressure of the sealed cabin (5) is greater than the external air pressure, when the net material outlet (101) is opened, the strong air pressure difference will quickly flush the wet material out of the net material outlet (101) and enter the drying device below. S10. Dry the reduced metal material until it is completely dry, and return to S1.

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