Full-automatic production system of superfine tungsten carbide powder

Abstract

The present application relates to the field of powder metallurgy, and provides a full-automatic production system for superfine tungsten carbide powder, comprising: a pushing boat mechanism; a weighing and material pressing mechanism for receiving a material boat to check the weight and pre-press the material; a carbonization furnace for carbonizing the pre-pressed material; a material pouring and overturning mechanism for receiving the material boat containing the carbonized material and performing an overturning action to pour the material; a planetary material feeding and shredding mechanism connected below the material pouring and overturning mechanism for multi-stage shredding and grading of the carbonized material; and a overturning and sealing mechanism arranged inside the material pouring and overturning mechanism for isolating the unloading path from the external atmosphere during overturning and unloading, so as to form a closed flow guiding space and collect dust. The present application realizes the automation and dust-free operation of the whole process of superfine tungsten carbide powder production, effectively solves the problems of difficult unloading of the adhered boat, serious dust pollution and low production efficiency, and significantly improves the material recovery rate and product quality.

Description

Technical Field

[0001] This invention relates to the field of powder metallurgy, and more specifically, to a fully automated production system for ultrafine tungsten carbide powder. Background Technology

[0002] In the field of cemented carbide material preparation, cemented carbide prepared using ultrafine or nano-tungsten carbide powder has become a core material for high-end cutting tools and mold manufacturing due to its excellent strength and toughness. However, in the production process of ultrafine tungsten carbide, the loading before carbonization and the unloading after carbonization are mainly done manually, which presents many technical bottlenecks. During the high-temperature carbonization process, tungsten carbide is prone to sticking to the inner wall of the carbonization boat (i.e., boat sticking phenomenon). When unloading manually, tools such as pry bars and hammers are needed to forcibly peel it off, making the operation process complex and inefficient. At the same time, the loose density of ultrafine tungsten carbide is low, and the amount of material loaded into the boat during manual pressing is small, which limits the production capacity. In addition, a large amount of tungsten carbide dust is generated during the unloading process, which can easily cause occupational health hazards to operators if inhaled. The carbonization boat and the blocky material inside are heavy, and the labor intensity of manual handling and turning is high. Moreover, the carbonization boat is easily damaged and materials are wasted due to operational errors. Although some automatic unloading devices for metal powders exist in the existing technology, they are not designed for the high hardness and sticking characteristics of tungsten carbide. The large turning radius and high speed during unloading not only fail to effectively solve the sticking problem, but also exacerbate dust flying. At the same time, the blocky material is prone to irregular breakage due to impact, which affects the particle size uniformity of subsequent powder processing. Summary of the Invention

[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, the present invention provides a fully automated production system for ultrafine tungsten carbide powder, comprising: a feeding and pushing mechanism; a weighing and pressing mechanism for receiving a material boat under the pushing of the feeding and pushing mechanism for weight verification and pre-pressing the material; a carbonization furnace for receiving the material boat pushed by the feeding and pushing mechanism and carbonizing the pre-pressed material inside; a dumping and turning mechanism for receiving the material boat containing carbonized material pushed by the feeding and pushing mechanism and performing a turning action to dump the material; a planetary feeding and shredding mechanism connected below the dumping and turning mechanism for multi-stage shredding and grading of the carbonized material dumped into its inner side; and a turning and sealing mechanism disposed inside the dumping and turning mechanism for isolating the unloading path from the external atmospheric environment during turning and unloading, thereby forming a sealed guide space and collecting dust. This invention achieves a fully automated process from boat feeding and weighing to carbonization, unloading, and shredding through the coordinated operation of the boat feeding mechanism, weighing and pressing mechanism, carbonization furnace, unloading and tilting mechanism, planetary feeding and shredding mechanism, and tilting and sealing mechanism. This effectively solves the problems of high labor intensity and low efficiency of manual operation. At the same time, the tilting and sealing mechanism enables dust isolation and collection during the unloading process, significantly improving the working environment.

[0005] Optionally, the weighing and pressing mechanism includes: The frame integrates an electronic weighing module for verifying the weight of the material boats; The loading cavity, located in the middle of the frame, is used to receive the mixture to be pressed; The upper pressure head assembly is installed on the top of the frame and is driven by the first servo drive to extend into the loading mold cavity to perform the upper pressure operation, so as to press the mixture into a cake-shaped cylindrical material; The demolding assembly, installed at the bottom of the frame, is driven by the second servo drive to extend into the loading mold cavity to perform the demolding operation, so as to push the pressed and formed disc-shaped cylindrical material into the material boat below. The servo control system is electrically connected to the first servo drive and the second servo drive. A dust collection device, installed on the side of the filling mold cavity, is used to collect dust simultaneously during pressing and demolding. The servo control system includes a PLC controller, a first servo driver electrically connected to a first servo drive device, and a second servo driver electrically connected to a second servo drive device. The first servo driver adjusts the output torque of the first servo drive device according to the instructions of the PLC controller to precisely adjust the pressing force of the upper pressing head assembly within the range of 0-1000 kg. The second servo driver controls the displacement of the second servo drive device according to the instructions of the PLC controller to achieve servo demolding and loading. The electronic weighing module is a high-precision electronic weighing module with an accuracy of ±0.1 g. This invention achieves accurate verification of material weight through a high-precision electronic weighing module and precisely controls the pressing force and demolding displacement through a servo control system, ensuring the consistency of pressing density and the stability of demolding. Simultaneously, the dust collection device effectively reduces dust overflow during the pressing process.

[0006] Optionally, the material tilting mechanism includes: The tilting chamber has a smooth mirror-like contact surface inside, which reduces material adhesion and facilitates cleaning. It is sealed with a dust cover on top and a transfer chamber on the bottom. The planetary feeding and shredding mechanism is sealed below the transfer chamber. Two compartmentalized isolation baffles are symmetrically fixed to both sides of the inner wall of the tilting chamber, dividing the inner cavity of the tilting chamber into an upper drive isolation chamber and a lower discharge working chamber. The tilting tube is horizontally installed inside the tilting chamber and located in the drive isolation cavity. One end of the tilting tube that extends to the outside of the tilting chamber is fixedly connected to the drive gear, which is connected to the tilting drive assembly installed outside the tilting chamber.

[0007] Optionally, the tilting tube is rotatably connected to two tilting tube bearing brackets on both sides of the tilting chamber; a functional window for unloading material is opened on the circumferential wall of the tilting tube, and a limiting groove extending axially is provided inside the tilting tube, which slides in engagement with a limiting protrusion on the outer wall of the material boat; one end of the tilting tube has a material boat inlet, and the other end has a material boat outlet. Through the sliding engagement between the limiting groove and the limiting protrusion on the outer wall of the material boat, precise positioning and stable transmission of the material boat are achieved within the tilting tube, ensuring the stability of the tilting and unloading process.

[0008] Optionally, the inner wall of the tilting tube is equipped with a four-point symmetrical positioning and clamping assembly. This assembly includes four clamping units symmetrically distributed circumferentially along the inner wall of the tilting tube. Each clamping unit has a flexible buffer pad at its clamping end. The clamping force of each clamping unit is independently adjusted via a precision pressure regulating valve. After the material boat enters the tilting tube through the material boat inlet and is positioned by the engagement of the limiting groove and the limiting protrusion, the four clamping units simultaneously clamp the material boat, maintaining a four-point symmetrical clamping state during the tilting process. After tilting and resetting, the four clamping units release, and the material boat is output through the material boat outlet. The combination of the four-point symmetrical clamping structure and the flexible buffer pad ensures the positional stability of the material boat during the tilting process, preventing localized stress concentration that could lead to boat breakage or deformation, and extending the boat's service life.

[0009] Optionally, the inner edge of the compartment isolation baffle is arc-shaped and forms a rolling fit with the outer circumferential surface of the tilting tube. This rolling fit between the arc-shaped inner edge and the outer circumferential surface of the tilting tube reduces frictional resistance between the compartment isolation baffle and the tilting tube, ensuring smooth tilting motion and enhancing the isolation effect.

[0010] Optionally, the tilting and sealing mechanism includes: a sealing plate with a built-in negative pressure dust collection interface, the sealing plate sealing and fitting below the compartment isolation baffle, one end of the sealing plate being fixedly connected to a rotating shaft, both ends of the rotating shaft being rotatably connected to the tilting chamber via bearings, one end of the rotating shaft extending outside the tilting chamber being fixedly connected to one end of a force transmission seat, the other end of the force transmission seat being rotatably connected to the output end of a drive cylinder, and the fixed end of the drive cylinder being rotatably connected to the side wall of the tilting chamber. By driving the sealing plate to rotate via the drive cylinder, the automatic sealing and opening of the unloading path is achieved. Combined with the negative pressure dust collection interface, dust generated during the unloading process is effectively collected, achieving dust-free operation.

[0011] Optionally, the sealing plate is made of elastic polymer composite material. The sealing surface of the sealing plate has a compression allowance to conform to the irregular end face of the sealing position during sealing. The sealing plate has a negative pressure suction channel inside, with one end forming a dust suction port facing the unloading path and the other end connected to a negative pressure dust suction interface for connection to an external dust removal system. A pressure regulating valve is installed in the air circuit of the drive cylinder to adjust the clamping force of the sealing plate on the sealing position. The elastic polymer composite material allows the sealing plate to maintain good deformation recovery ability after long-term operation, the compression allowance can compensate for shape errors of the mating end face, and the pressure regulating valve can flexibly adjust the clamping force, balancing sealing reliability and the service life of the sealing plate.

[0012] Optionally, the flip drive component includes: The tilt drive motor is located outside the tilt chamber and is driven synchronously by two servo motors. A precision reducer, the input of which is connected to the output of two servo motors; The drive gear is fixed to the output end of the precision reducer and meshes with the driving gear. The dual servo motors, driven by a precision reducer, allow the tilting tube to stop at any angle within the 0-360° range. The synchronous drive of the dual servo motors, in conjunction with the precision reducer, enables precise control of the tilting angle and speed, meeting the tilting angle requirements of different unloading processes.

[0013] Optionally, the dual servo motors drive the flip tube via a precision reducer to execute a segmented flipping program; the segmented flipping program includes: Initial loosening stage: The drive tube rotates from the initial position to 45° and stops. The drive tube is then driven to swing slightly around the 45° position in a low-speed reciprocating micro-motion manner, so that the adhesion interface between the blocky material in the material boat and the inner wall of the boat will produce micro-cracks and loosen. Complete peeling stage: The drive tube continues to rotate until it stops at 180°, and works in conjunction with the vibration device installed on the tube to peel the material from the inner wall of the material boat; the vibration frequency of the vibration device is 50-200Hz; Secondary cleaning stage: Drive the tilting tube to rotate to 360°, and use the vibration device to clean the residual material in the boat by reverse vibration, so as to complete the unloading and resetting.

[0014] This invention features a segmented flipping process designed to address the sticking characteristics of tungsten carbide boats. The process involves first loosening, then peeling off, and finally cleaning, and is combined with a vibration device to completely solve the boat sticking problem, significantly improving the material recovery rate.

[0015] Optionally, during the segmented flipping process, the vibration device remains active both when the flipping tube is stopped at 180° and during its 360° rotation, and collects dust in real time through the negative pressure suction port on the sealing plate in conjunction with the negative pressure system. Through the coordinated operation of the vibration device and the negative pressure system, real-time dust collection is achieved throughout the unloading process, further improving dust collection efficiency and the working environment.

[0016] Optionally, the planetary feeding shredding mechanism includes: a planetary feeding unit, which adopts a spiral propulsion structure and is driven by a feeding servo motor. The feeding servo motor is used to control the frequency of material entering the shredding chamber according to a preset speed, so as to ensure uniform output of blocky material and avoid blockage. A multi-stage shredding unit is located below the planetary feeder unit; the multi-stage shredding unit includes: The first-stage dual-shaft shredder assembly is used to shred blocky materials to 5-10mm; The second-stage planetary grinding head is located below the dual-shaft shredder assembly and is used to further refine the material to 100-500µm. The circulating classification mechanism, located below the second-stage planetary grinding head, has a qualified powder outlet and a non-qualified material return outlet. The non-qualified material return outlet is connected to the feed end of the planetary feeding unit, used to automatically return materials that do not meet the particle size requirements for secondary shredding. The planetary feeding unit ensures that the material enters the shredding chamber evenly, avoiding blockage; the multi-stage shredding unit achieves progressive refinement of the material, ensuring the uniformity of the output particle size; the circulating classification mechanism enables the automatic return of non-qualified materials for reprocessing, and also helps to ensure the quality of the final product.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: This application discloses a fully automated production system for ultrafine tungsten carbide powder. Through the coordinated operation of a boat-feeding mechanism, a weighing and pressing mechanism, a carbonization furnace, a material-discharging and turning mechanism, a planetary feeding and shredding mechanism, and a turning and sealing mechanism, the entire process from boat feeding, weighing and pressing, carbonization, turning and unloading to shredding and discharge is fully automated. The production efficiency is significantly improved compared to manual labor, while reducing labor costs and labor intensity. The segmented turning program and vibration device designed for the boat-sticking characteristics of tungsten carbide, combined with 360° secondary cleaning, completely solve the boat-sticking problem and achieve a high material recovery rate. At the same time, the four-point symmetrical positioning and clamping components set in the turning tube, combined with flexible buffer pads, ensure the stability of the boat turning while avoiding stress concentration that could cause boat breakage, thus extending the service life of the boat. In addition, the flip-sealing mechanism combined with the negative pressure dust collection system forms a closed space during the unloading process and collects dust in real time. The dust collection efficiency is high, effectively protecting the health of operators and avoiding material waste. The integrated planetary feeding shredding mechanism realizes multi-stage shredding and grading, and the output particle size can be precisely adjusted within the range of 100-500µm to meet the needs of different products.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a fully automated production system for ultrafine tungsten carbide powder according to the present invention; Figure 2 This is a schematic diagram of the material pouring and turning mechanism and the material pouring and turning mechanism of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the material pouring and turning mechanism and the material pouring and turning mechanism of the present invention. Figure 2 ; Figure 4This is a schematic diagram of the material pouring and turning mechanism and the material pouring and turning mechanism of the present invention. Figure 3 ; Figure 5 This is a schematic diagram of the material pouring and turning mechanism and the material pouring and turning mechanism of the present invention. Figure 4 ; Figure 6 This is a partial schematic diagram of the material pouring and turning mechanism and the material pouring and turning mechanism of the present invention. Figure 1 ; Figure 7 This is a partial schematic diagram of the material pouring and turning mechanism and the material pouring and turning mechanism of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the material turning mechanism of the present invention. Figure 1 ; Figure 9 This is a schematic diagram of the material turning mechanism of the present invention. Figure 2 ; Figure 10 This is a schematic diagram of the material turning mechanism of the present invention. Figure 3 ; Figure 11 This is a schematic diagram of the material turning mechanism of the present invention. Figure 4 ; Figure 12 This is a schematic diagram of the material turning mechanism of the present invention. Figure 5 .

[0020] Figure 13 This is a schematic diagram of the weighing and pressing mechanism of the present invention.

[0021] Icons: 1. Pushing boat mechanism; 2. Weighing and pressing mechanism; 201. Frame; 202. Loading mold cavity; 203. Upper pressing head assembly; 204. Demolding assembly; 205. Dust collection device; 3. Discharging and turning mechanism; 301. Turning bin; 302. Transfer bin; 303. Dividing bin isolation baffle; 304. Turning pipe; 305. Drive gear; 306. Turning drive assembly; 307. Function window; 308. Turning drive motor; 4. Turning sealing mechanism; 401. Sealing plate; 402. Rotating shaft; 403. Force transmission seat; 404. Drive cylinder; 5. Material boat; 6. Planetary feeding and shredding mechanism. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0023] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0024] The following is in conjunction with the appendix Figures 1-13The present invention will be described in further detail below.

[0025] Example 1:

[0026] like Figures 1-13As shown, this invention provides a fully automated production system for ultrafine tungsten carbide powder. The system mainly includes a feeding and pushing mechanism 1, a weighing and pressing mechanism 2, a carbonization furnace, a material unloading and tilting mechanism 3, a planetary feeding and shredding mechanism 6, and a tilting and sealing mechanism 4. These mechanisms work together to form a complete automated production line, achieving unmanned operation throughout the entire process from material loading, pretreatment, high-temperature carbonization to finished product unloading and shredding. The feeding and pushing mechanism 1 is located at the beginning of the production line and is used to carry and transport the loaded material in a boat 5. The feeding and pushing mechanism 1 can adopt a servo-driven synchronous belt transmission system, equipped with a high-precision positioning sensor and an anti-deviation guiding device to ensure that the boat 5 can be accurately transported to the next station according to a preset rhythm. The weighing and pressing mechanism 2 is used to receive the material boat 5 under the push of the feeding and pushing mechanism 1 for weight verification and pre-pressing of the material. When the feeding and pushing mechanism 1 pushes the material boat 5 to the station of the weighing and pressing mechanism 2, the system automatically detects the weight of the material in the material boat 5 to verify whether the feeding amount meets the process requirements. Subsequently, the weighing and pressing mechanism 2 performs a pre-compression operation on the material, pressing the loose powder material into a dense, cake-shaped cylindrical material. This step not only increases the loading capacity of the boat and improves the single-furnace capacity, but also effectively reduces the volatilization loss of the material during the subsequent carbonization process. The carbonization furnace is used to receive the material boat 5 pushed by the boat pushing mechanism 1 and to carbonize the pre-compressed material inside. The pre-compressed material enters the carbonization furnace with the boat 5 and completes the carbonization reaction in a high-temperature environment to generate tungsten carbide lumps. The specific structure and temperature control parameters of the carbonization furnace can be adjusted according to the actual production process, and this embodiment does not impose specific limitations on them. The material pouring and turning mechanism 3 is used to receive the material boat 5 containing carbonized material pushed by the boat pushing mechanism 1 and to perform a turning action to pour out the material. After the carbonization process is completed, the boat 5 is pushed to the material pouring and turning mechanism 3. This mechanism fixes the boat 5 by clamping or supporting it and drives it to turn over by a drive device, so that the tungsten carbide lumps inside are released from the boat under the action of gravity. Because tungsten carbide material is prone to sticking to the inner wall of the boat at high temperatures (i.e., boat sticking), the design of the material discharge and tilting mechanism 3 must have sufficient tilting torque and a specific tilting trajectory to ensure that the material can be discharged smoothly. The planetary feeding and shredding mechanism 6 is connected below the material discharge and tilting mechanism 3 and is used to perform multi-stage shredding and grading of the carbide material poured into its inner side. The blocky material discharged from the material discharge and tilting mechanism 3 falls directly into the planetary feeding and shredding mechanism 6 below. This mechanism first uniformly conveys the material through the feeding unit to avoid blockage; then, the multi-stage shredding unit crushes the large pieces of material into powder that meets the particle size requirements, and the grading mechanism screens out qualified products. Unqualified materials are returned for re-shredding, forming a closed-loop control to ensure the particle size uniformity of the final product. The tilting and sealing mechanism 4 is set inside the material discharge and tilting mechanism 3 and is used to isolate the discharge path from the external atmospheric environment during tilting and unloading to form a sealed guide space and collect dust.This is the key technical feature of this embodiment in solving the dust pollution problem. The flipping and sealing mechanism 4 is not independently set outside the material-discharging and flipping mechanism 3, but is integrated into the internal space of the material-discharging and flipping mechanism 3. Before the material-discharging and flipping mechanism 3 starts to perform the flipping and unloading action, the flipping and sealing mechanism 4 first acts to close the connection between the unloading path and the outside, thereby creating a temporary sealed flow space between the material-discharging and flipping mechanism 3 and the planetary feeding and shredding mechanism 6. Within this sealed space, the dust generated during the process of material being poured from the boat 5 to the shredding mechanism is completely confined within the system and cannot escape into the external atmosphere. At the same time, in conjunction with the negative pressure dust collection system, the dust is quickly captured and recovered, which not only protects the occupational health of the operators, but also avoids the waste of expensive tungsten carbide materials. It has advantages such as high sealing reliability, compact structure, and fast response speed, and can adapt to high-frequency automated flipping operations. Through the above solution, the built-in design of the flipping and sealing mechanism 4 in this embodiment cuts off the path of dust overflow at the source, solving the problems of large amounts of dust and harsh environment caused by manual unloading in the prior art.

[0027] Example 2:

[0028] This embodiment, based on Embodiment 1, provides a detailed explanation of the specific structure and working principle of the weighing and pressing mechanism 2 in the fully automated production system of ultrafine tungsten carbide powder. For example... Figures 1-13As shown, the weighing and pressing mechanism 2 includes a frame 201, a loading mold cavity 202, an upper pressing head assembly 203, a demolding assembly 204, a servo control system, and a dust collection device 205. The frame 201 serves as the main support for the entire mechanism and integrates an electronic weighing module. This module is used to verify the weight of the material boats 5. When the boat-pushing mechanism 1 pushes the boats 5 containing the mixed materials into the frame 201, the electronic weighing module first performs a high-precision detection of the total weight of the boats 5 and their contents, eliminating unqualified boats due to upstream feeding errors. This ensures that the material ratio of each boat entering the carbonization furnace meets the process standards, thereby guaranteeing the consistency of the final product's composition. In this embodiment, the electronic weighing module is preferably a high-precision electronic weighing module with an accuracy of ±0.1g, which can adapt to the stringent requirements of ultrafine tungsten carbide powder for component ratio. If the accuracy is too low, even a small deviation in the ratio may lead to significant differences in product performance after high-temperature carbonization. A loading cavity 202 is located in the middle of the frame 201 and is used to receive the mixture to be pressed. An upper pressure head assembly 203 is mounted on the top of the frame 201 and is driven by a first servo drive to extend into the loading cavity 202 to perform an upper pressure operation, pressing the mixture into a disc-shaped cylindrical material. A demolding assembly 204 is mounted on the bottom of the frame 201 and is driven by a second servo drive to extend into the loading cavity 202 to perform a demolding operation, pushing the pressed disc-shaped cylindrical material into the material boat 5 below. A servo control system is electrically connected to the first and second servo drive devices. The servo control system includes a PLC controller, a first servo driver electrically connected to the first servo drive device, and a second servo driver electrically connected to the second servo drive device. The first servo driver adjusts the output torque of the first servo drive device according to the instructions of the PLC controller to precisely adjust the pressing force of the upper pressure head assembly 203 within the range of 0-1000 kg. This wide-range pressing force adjustment capability is a defensive technical solution designed for different material characteristics. For ultrafine tungsten carbide powder with extremely low loose density, excessive pressure can damage the material's internal permeability, leading to incomplete carbide reaction. In this case, the PLC controller can set a smaller pressing force (e.g., 100kg-200kg) to increase the loading capacity while maintaining necessary porosity. Conversely, for processes requiring increased single-boat loading, a larger pressing force (e.g., 800kg-1000kg) can be set to compress the material to a dense state, significantly increasing single-furnace capacity. The second servo drive controls the displacement of the second servo drive device according to the PLC controller's instructions to achieve servo demolding and loading. Through precise control of displacement by the servo motor, the demolding assembly 204 can push out the cake material at a stable speed, avoiding the problem of cake material breakage caused by sudden speed changes in traditional pneumatic or hydraulic demolding. A dust collection device 205 is located on the side of the loading mold cavity 202 to collect dust simultaneously during pressing and demolding.The working sequence of the dust collection device 205 is closely coupled with the pressing and demolding actions. When the first servo drive device drives the upper pressing head assembly 203 to move downward to start pressing, the dust collection device 205 is turned on simultaneously to suck up the fine dust that flies in the filling mold cavity 202 due to the turbulence of compressed airflow; when the demolding assembly 204 pushes out the cake material, the dust collection device 205 continues to be turned on to collect the dust generated at the moment of demolding, thus preventing the overflow of dust from the source and ensuring a clean working environment.

[0029] Example 3:

[0030] This embodiment, based on Embodiment 1, provides a detailed explanation of the specific structure and working principle of the material turning mechanism 3 in the fully automated production system for ultrafine tungsten carbide powder. For example... Figures 1-13As shown, the material turning mechanism 3 includes a turning chamber 301, compartment isolation baffles 303, a turning pipe 304, and a turning drive assembly 306. The turning chamber 301, as the main container for the material turning action, has a smooth mirror-like contact surface inside, which effectively reduces the adhesion of tungsten carbide powder to the chamber wall, lowers the material residue rate, and facilitates subsequent cleaning and maintenance. A dust cover is sealed to the top of the turning chamber 301, and a transfer chamber 302 is sealed to its bottom. Below the transfer chamber 302, a planetary feeding and shredding mechanism 6 is sealed. This layered sealing structure ensures that the material remains in a relatively closed channel during the turning and unloading process, preventing dust leakage. Two compartment isolation baffles 303 are symmetrically fixed to both sides of the inner wall of the turning chamber 301, dividing the inner cavity of the turning chamber 301 into an upper drive isolation chamber and a lower discharge working chamber. A tilting tube 304 is horizontally inserted inside the tilting chamber 301 and located within the drive isolation cavity. One end of the tilting tube 304 extending outside the tilting chamber 301 is fixedly connected to a drive gear 305, which is connected to a tilting drive assembly 306 mounted outside the tilting chamber 301. The tilting tube 304 is rotatably connected to two tilting tube bearing brackets on both side walls of the tilting chamber 301, ensuring the smoothness of the tilting action. Furthermore, a functional window 307 for discharging material is provided on the circumferential wall of the tilting tube 304. In the initial state, the functional window 307 faces upwards to receive the material carrier 5; in the tilting and unloading state, the functional window 307 rotates downwards with the tilting tube 304 to discharge the material. An axially extending limiting groove is provided inside the tilting tube 304, which slides in conjunction with a limiting protrusion on the outer wall of the material carrier 5. This design solves the positioning problem of the carrier during dynamic tilting. When the material boat 5 enters the tilting tube 304, the limiting protrusion on its outer wall slides into the limiting groove, forming a connection similar to a keyway. When the tilting tube 304 tilts at a large angle of 0-360°, the material boat 5 remains relatively fixed under the support of the side wall of the limiting groove, preventing slippage or detachment and ensuring the accuracy of the unloading position. The tilting tube 304 has an inlet for the material boat 5 at one end and an outlet for the material boat 5 at the other end, facilitating the flow of the material boat 5 in and out.

[0031] Furthermore, the inner wall of the tilting tube 304 is equipped with a four-point symmetrical positioning and clamping assembly. This assembly includes four clamping units symmetrically distributed circumferentially along the inner wall of the tilting tube 304. Each clamping unit has a flexible buffer pad at its clamping end, and the clamping force of each unit is independently adjustable via a precision pressure regulating valve. A clearance function window 307 is provided for the four clamping units to ensure unobstructed material discharge. The clamping units can employ a pneumatic clamping structure, with a precision pressure regulating valve independently installed on the air path of each unit to achieve independent stepless adjustment of the clamping force. After the material boat 5 enters the flipping tube 304 through the material boat inlet and is positioned by the sliding engagement of the limiting groove and the limiting protrusion, the four clamping units extend synchronously and clamp the material boat 5. The flexible buffer pad elastically abuts against the outer wall of the material boat 5, so that the material boat 5 maintains a four-point symmetrical clamping state in the flipping tube 304. After the segmented flipping program is completed and the flipping tube 304 is reset, the four clamping units 3091 retract synchronously and release, and the material boat 5 is output through the material boat outlet.

[0032] The four-point symmetrical positioning clamping assembly and the limiting groove form a complementary dual positioning system. The cooperation between the limiting groove and the limiting protrusion provides axial guidance and circumferential positioning when the material boat 5 enters the tilting tube 304. The four-point symmetrical positioning clamping assembly provides radial clamping and fixation of the material boat 5 during the tilting process. Together, they ensure that the material boat 5 does not slip, shake, or fall off under large-angle tilting from 0 to 360° and high-frequency vibration conditions of the vibration device. At the same time, the symmetrical arrangement of the four clamping points ensures that the clamping force is evenly distributed around the circumference of the material boat 5. Combined with the elastic deformation of the flexible buffer pad, it avoids local stress concentration caused by uneven force distribution in single-point or two-point clamping methods. The clamping force of each clamping unit is independently adjusted by a precision pressure regulating valve. On the one hand, it can match the appropriate clamping force according to the specifications and loading capacity of the material boat 5. On the other hand, it can compensate for manufacturing deviations of the material boat 5 and ensure balanced force distribution at the four points. While ensuring positional stability during the tilting process, it effectively avoids cracking or deformation of the boat body due to local stress concentration, significantly improving the service life of the boat.

[0033] The inner edge of the compartment isolation baffle 303 is arc-shaped and forms a rolling fit with the outer circumferential surface of the tilting tube 304. Since the tilting tube 304 needs to rotate relative to the compartment isolation baffle 303, if the inner edge of the baffle 303 is designed with a traditional right angle or a flat surface, the tilting tube 304 is prone to interference with the baffle edge during rotation, leading to jamming or wear. In this embodiment, the inner edge of the baffle is designed as an arc, forming a point or line contact rolling fit with the outer circumferential surface of the tilting tube 304. This not only greatly reduces frictional resistance, making the tilting action smoother and reducing the energy consumption of the drive motor, but more importantly, the arc-shaped edge can always maintain a tight fit with the outer surface of the tilting tube 304 during rotation, forming a dynamic sealing barrier, further preventing dust in the discharge working chamber from entering the drive isolation chamber.

[0034] Example 4:

[0035] This embodiment, based on Embodiment 1, provides a detailed explanation of the specific structure and working principle of the flipping sealing mechanism 4 and the flipping drive assembly 306 in the fully automated production system for ultrafine tungsten carbide powder. For example... Figures 1-13As shown, the tilting and sealing mechanism 4 is a key component for achieving dust-free unloading. The tilting and sealing mechanism 4 includes a sealing plate 401 with a built-in negative pressure dust extraction interface, which seals and fits below the compartment isolation baffles 303. The shape of the sealing plate 401 matches the shape of the opening formed below the two compartment isolation baffles 303 to achieve a tight seal. One end of the sealing plate 401 is fixedly connected to a rotating shaft 402. Both ends of the rotating shaft 402 are rotatably connected to the tilting chamber 301 via bearings. One end of the rotating shaft 402 extending outside the tilting chamber 301 is fixedly connected to one end of a force transmission seat 403. The other end of the force transmission seat 403 is rotatably connected to the output end of a drive cylinder 404. The fixed end of the drive cylinder 404 is rotatably connected to the side wall of the tilting chamber 301. Before the tilting and unloading mechanism 3 is ready to perform the tilting and unloading action, the output end of the drive cylinder 404 extends, pushing the force transmission seat 403 to move. Since one end of the force transmission seat 403 is fixed to the rotating shaft 402, the swinging of the force transmission seat 403 drives the rotating shaft 402 to rotate around its axis. The rotation of the rotating shaft 402 then drives the sealing plate 401, which is fixedly connected to it, to flip, rotating it from the initial open state to the sealing position, tightly covering the compartment isolation baffle 303. This action path design transforms the linear extension and retraction motion of the drive cylinder 404 into the rotational opening and closing motion of the sealing plate 401, resulting in a compact structure and reliable operation. After unloading is completed, the drive cylinder 404 retracts, driving the sealing plate 401 to flip back to its original position. Furthermore, the sealing plate 401 is made of elastic polymer composite material, and its sealing surface has a reserved compression allowance. Due to welding and assembly process errors at the mating surfaces of the tilting chamber 301, the compartment isolation baffle 303, and the transfer chamber 302, absolute flatness cannot be guaranteed. When the sealing plate 401 is closed, its elastic sealing surface is compressed and undergoes elastic deformation. The compression allowance can compensate for the shape errors of the aforementioned irregular end faces, ensuring a tight, surface-to-surface contact between the sealing surface and the sealing end face, thus preventing dust from escaping through gaps. Simultaneously, the elastic polymer composite material possesses excellent wear resistance, oil resistance, and deformation recovery capabilities, maintaining stable sealing performance even after long-term high-frequency opening and closing, extending the service life of the sealing plate 401.

[0036] The sealing plate 401 integrates a negative pressure suction channel. One end of the channel forms a dust suction port facing the unloading path, while the other end connects to a negative pressure dust collection interface, which is connected to the workshop's central dust removal system or an independent industrial dust collector via pipeline. During unloading, the negative pressure suction channel creates a micro-negative pressure environment within the enclosed guiding space, actively sucking up suspended dust generated by material falling and vibrating. Actual measurements show that this negative pressure collection system has high efficiency in capturing dust particles with a diameter in the range of 1-100μm. This not only significantly reduces the dust concentration in the working area, protecting the occupational health of operators, but also minimizes the dust loss of valuable tungsten carbide powder, significantly improving the actual utilization rate of materials.

[0037] A pressure regulating valve is installed in the air circuit of the drive cylinder 404 to adjust the sealing clamping force of the sealing plate 401. The cylinder output force can be flexibly set according to the working conditions through the pressure regulating valve. When the wear of the mating end face or the tendency of dust leakage increases, the clamping force can be appropriately increased to ensure airtightness; during long-term operation, the clamping force can be reduced to slow down the wear of the sealing plate 401 and the mating end face, taking into account both sealing effect and equipment life.

[0038] The flipping sealing mechanism 4 is linked to the segmented flipping program, and the complete action sequence is as follows: During the boat loading stage, the sealing plate 401 is in the open state, which facilitates the transfer chamber 302 to maintain normal communication with the downstream shredding mechanism and facilitates the material boat 5 to enter and exit the tilting pipe 304. Before the material boat 5 enters the tilting tube 304 and is ready to perform the tilting and unloading action, the control system issues a command to drive the cylinder 404 to complete the extension action within ≤0.5s. Through the force transmission seat 403, the rotating shaft 402 is rotated, causing the sealing plate 401 to quickly tilt from the open position to the sealing position, tightly covering the bottom of the compartment isolation baffle 303. Together with the tilting chamber 301 and the transfer chamber 302, they form a closed flow guide space, isolating the unloading path from the outside atmosphere. Subsequently, the flipping tube 304 performs segmented flipping and unloading at 45°, 180° and 360°. The vibration device starts and stops at the 180° and 360° stages according to the program, and the negative pressure suction channel continuously sucks up the dust. The material falls into the transfer bin 302 in the closed guide space and enters the downstream shredding mechanism. The dust is confined in the closed space and cannot escape. After unloading is completed and the tilting pipe 304 is reset, the drive cylinder 404 retracts, and the sealing plate 401 resets and opens within ≤0.5s, which facilitates the empty boat to be sent out and the cleaning of the sealing plate 401 and the transfer chamber 302, in preparation for the next round of operation.

[0039] The sealing plate 401 has a built-in negative pressure dust collection interface. During the tipping and unloading process, the sealing plate 401 is in a blocked state, isolating the unloading path from the external atmosphere and forming a closed flow guide space. At this time, the negative pressure dust collection interface is connected to the external negative pressure system, forming a negative pressure airflow in the closed space, realizing a mode of unloading and dust collection at the same time. When the material is poured down from the boat 5, a large amount of dust is generated. Due to the obstruction of the sealing plate 401, the dust cannot escape outward and can only be quickly sucked into the dust collection interface under the action of the negative pressure airflow, thereby realizing real-time dust collection. Compared with the traditional centralized dust removal method after unloading, it greatly improves the dust removal efficiency and effectively avoids the waste of expensive tungsten carbide powder and pollution to the operating environment. The tipping drive assembly 306 includes a tipping drive motor 308, a precision reducer, and a drive gear set outside the tipping chamber 301. The tipping drive motor adopts a dual servo motor synchronous drive. The input end of the precision reducer is connected to the output end of the dual servo motors; the drive gear is fixed to the output end of the precision reducer, and the drive gear meshes with the drive gear 305. This embodiment preferably uses a dual servo motor synchronous drive instead of the traditional single motor or hydraulic drive. This is a defensive design based on the high density and weight characteristics of tungsten carbide material and the high precision requirements of the unloading process. Specifically, single motor drives are prone to deviations in the flipping angle due to output torque fluctuations when facing large inertia loads, making precise angle positioning difficult. While hydraulic drives offer greater power, they struggle to achieve precise servo control and stable stopping at any angle, and there is a risk of hydraulic oil leakage contaminating the material. The dual servo motor synchronous drive scheme, through the collaborative work of two servo motors, outputs superimposed torque, easily driving the fully loaded flipping tube 304 to flip. More importantly, the dual servo system has excellent synchronization and response speed, ensuring uniform force on both sides of the flipping tube 304, avoiding mechanical jamming or vibration caused by uneven loading, and significantly improving the smoothness of the flipping action. The two servo motors communicate with each other via a high-speed real-time bus and adopt synchronous closed-loop control. Driven by a high-precision planetary reducer, they can be steplessly adjusted within the range of 0~10rpm. This not only meets the requirements of speed resolution and dynamic response for low-speed reciprocating micro-motion in segmented flipping programs, but also ensures synchronous torque output of the two servo motors under high inertia full-load conditions.

[0040] Example 5:

[0041] This embodiment, based on Embodiment 1, details the specific workflow of the material turning mechanism 3, particularly the segmented turning procedure and its collaborative working mechanism with the vibration device. This is a key technical solution to address the critical issue of severe adhesion (boat sticking) between ultrafine tungsten carbide powder and the inner wall of the boat after high-temperature carbonization. Dual servo motors drive the turning tube 304 to execute the segmented turning procedure via precision reducers. This procedure is not a simple continuous rotation, but rather, based on the physical characteristics of material peeling, the turning process is divided into three stages with specific purposes. Specifically, the segmented turning procedure includes the following steps: Step S1, Initial Loosening Stage: The drive tilting tube 304 is tilted from its initial position to 45° and stopped to loosen the lumpy material inside the material boat 5. The tungsten carbide lumps adhere to the inner wall of the boat at high temperatures, resulting in a strong static friction layer. If a large-angle tilting is performed directly, the sudden change in the material's center of gravity may cause the lumps to collapse instantly, easily generating a large amount of dust and potentially causing uneven stress on the boat, leading to breakage. This embodiment selects 45° as the initial loosening angle, a defensive design based on mechanical analysis. At this angle, the gravitational component of the material is sufficient to break the critical point of static friction between the material and the bottom of the boat, causing a slight relative displacement and loosening of the lumps, but without completely detaching them from the boat's support.

[0042] After the rotating tube 304 reaches the 45° position and stops, the dual servo motors drive the rotating tube 304 to perform small reciprocating micro-movements near the 45° position using a low-speed stepless speed regulation method. The adhesion layer between the tungsten carbide block material and the inner wall of the boat is a brittle interface. The reciprocating micro-movement causes micro-cracks to initiate and propagate at the adhesion interface under the repeated action of the tangential component of gravity and alternating inertial forces. The penetration of micro-cracks significantly reduces the connection strength between the block material and the inner wall of the boat, thereby achieving overall loosening and pre-separation. This dual mechanism of "the tangential component of gravity breaking the static friction critical point and the reciprocating micro-movement initiating interface micro-cracks" cannot be achieved by relying solely on a single angle rotation.

[0043] The initial, tentative loosening prepares the ground for a thorough subsequent stripping, effectively preventing the material from collapsing instantly.

[0044] Step S2, Complete Peeling Stage: The drive tube 304 continues to rotate until it stops at 180°, and works in conjunction with the vibration device installed on the tube 304 to peel the material from the inner wall of the material boat 5. When the tube 304 reaches the 180° position, the opening of the boat faces downwards, and the material tends to fall under the influence of gravity, but the adhesive force may still prevent it from completely detaching. At this time, the vibration device starts to operate, with a vibration frequency of 50-200Hz that is continuously adjustable. The design of this frequency range has profound physical significance. As a non-rigid connector, the ultrafine tungsten carbide block material has its own specific natural frequency. When the frequency of the vibration device is set in the range of 50-200Hz, it can cover most of the natural frequency range of tungsten carbide block materials, thereby triggering a resonance or quasi-resonance effect. This high-frequency vibration can quickly destroy the intermolecular forces of the adhesive layer, allowing the material to be efficiently peeled from the inner wall of the boat. Simultaneously, the excitation force generated by the vibration device is combined with the direction of material descent. After resonance peeling, the material detaches from the boat wall as a whole under the combined traction of the excitation force and gravity, avoiding over-crushing caused by the material breaking apart. Compared with the traditional knocking method, this vibration peeling method is gentler and more uniform, will not cause mechanical damage to the boat, and also avoids excessive crushing of materials due to violent impact.

[0045] Step S3, Secondary Cleaning Stage: The driving tilting tube 304 is tilted 360° for secondary cleaning to complete unloading and resetting. After completing the 180° peeling, most of the material has fallen into the shredding mechanism below, but a small amount of fine powder may still be adsorbed on the inner wall of the boat or the inner cavity of the tilting tube. At this time, the tilting tube 304 continues to rotate 360°, and the vibration device switches to the reverse vibration cleaning mode, that is, the vibration direction is combined with the rotation direction of the tilting tube 304 in the opposite direction, so that the residual fine powder adsorbed on the inner wall of the boat is detached from the boat wall and thrown out under the combined action of the reverse excitation force and the rotational centrifugal force, completing the reverse vibration cleaning. At the same time, the 360° rotation restores the boat to its initial orientation, which facilitates the automatic output and recycling of the empty boat. This stage ensures the maximization of material recovery rate. Actual measurements showed that after the above three-stage coordinated unloading, the unloading rate of the material boat was relatively high, with the unloading rate being the percentage of the mass of the unloaded material to the total mass of the material in the boat.

[0046] Furthermore, during the segmented flipping process, the vibrating device remains active both when the flipping tube 304 is at a 180° stop and during a 360° rotation, collecting dust in real time through the negative pressure suction port on the sealing plate 401 in conjunction with the negative pressure system. During the 180° stop phase, the vibrating device activates to strip the material, which is the peak period for dust generation. During the 360° rotation cleaning phase, residual powder is ejected, also accompanied by dust. This embodiment specifies that the vibrating device is activated in both phases and synchronously linked with the negative pressure system to ensure that a negative pressure airflow exists within the sealed guide space at every moment of dust generation, rapidly capturing the dust. Through the coordinated operation mode of rotation, vibration, and dust removal, the problem of boat adhesion is completely solved, and a dust-free unloading process is achieved with high dust collection efficiency.

[0047] Example 6:

[0048] This embodiment, based on Embodiment 1, provides a detailed description of the specific structure and working principle of the planetary feeding shredding mechanism 6 in the fully automated ultrafine tungsten carbide powder production system. The planetary feeding shredding mechanism 6 includes a planetary feeding unit, a multi-stage shredding unit, and a circulating grading mechanism. The planetary feeding unit adopts a spiral propulsion structure and is driven by a feeding servo motor. The feeding servo motor controls the frequency of material entering the shredding chamber according to a preset speed to ensure uniform output of lumpy material and avoid blockage. Specifically, the tungsten carbide lumps discharged from the unloading and tilting mechanism 3 do not fall directly into the shredding chamber, but are first buffered and conveyed by the planetary feeding unit. Due to the irregular shape and extremely high hardness of the tungsten carbide lumps, if they were to fall directly into the shredding chamber by gravity, bridging or accumulation at the feed inlet would easily occur, causing the shredding unit to idle or overload. This embodiment precisely controls the feed flow rate of the material by precisely controlling the rotational speed of the spiral propeller using the feeding servo motor. For example, when the system detects that the material accumulation height in the shredding chamber has reached a preset threshold, the feeding servo motor automatically reduces its speed or stops feeding, and resumes normal feeding after the material is consumed.

[0049] The circulating classification mechanism is located below the second-stage planetary grinding head, and has a qualified powder outlet and a non-qualified material return outlet. After two stages of shredding, the material enters the circulating classification mechanism for particle size classification. Qualified powder that meets the particle size requirements is output to the downstream station through the qualified powder outlet, while non-qualified material is returned to the feed end of the planetary feeding unit for secondary shredding through the non-qualified material return outlet, thus forming a closed-loop processing flow of "shredding-classification-return". Through circulating classification, the final output powder particle size is concentrated within the target range, eliminating defects in subsequent cemented carbide products caused by coarse particles mixed into the finished product. At the same time, non-qualified material is automatically returned for reprocessing, avoiding material waste.

[0050] A servo motor drives a screw propeller to advance materials at an equivalent linear velocity of 0.5-5.0 m / min. The screw pitch and helix angle are optimized based on the high density and irregular shape of tungsten carbide lumps, ensuring conveying capacity while preventing material jamming between the screw blades. Feed control employs a feedforward-feedback composite algorithm: the unloading cycle of the preceding material tilting mechanism is used as the feedforward to preset the feeding speed, while the shredder motor load current and material level in the shredding chamber are used as feedback for real-time correction, dynamically matching the feeding flow rate with the shredding capacity.

[0051] This proactive flow control solves the feed blockage problem at its source, ensuring the continuity and stability of the shredding operation. The multi-stage shredding unit is located below the planetary feeder unit. This embodiment employs a combination strategy of "coarse crushing + fine grinding" to adapt to the high hardness of tungsten carbide material and the stringent requirements for finished particle size. The multi-stage shredding unit includes a first-stage dual-shaft shredding blade assembly, used to shred lumpy materials to 5-10mm. The dual-shaft shredding blade assembly uses two relatively rotating blade shafts to rapidly break large pieces of material into smaller pieces through the shearing and tearing action of the blades. The maximum feed particle size of the first-stage dual-shaft shredding blade assembly is 50mm, matching the particle size of the tungsten carbide lumpy material discharged by the unloading and tilting mechanism; the blades are made of carburized and quenched alloy steel, possessing high hardness and high wear resistance to cope with the extremely high hardness of tungsten carbide material and extend the service life of the blades.

[0052] It should be understood that the main purpose of the first-stage shredding is to reduce the size of the material, providing a suitable feed particle size for subsequent fine grinding and preventing large pieces of material from directly entering the fine grinding equipment and causing damage. The second-stage planetary grinding head is located below the dual-shaft shredder assembly and is used to further refine the material to 100-500µm. The planetary grinding head uses the squeezing and shearing forces between the high-speed rotating grinding disc and the grinding ring to grind small pieces of material into fine powder. By adjusting parameters such as the rotation speed and gap of the grinding head, the output particle size can be precisely controlled within the range of 100-500µm. Multiple sets of shearing and grinding gaps are provided between the planetary grinding head and the grinding ring. The grinding gap is precisely adjusted by an axial fine-adjustment mechanism to achieve continuous and precise control of the output particle size (100-500µm). The surface of the grinding head is also provided with self-cleaning grooves, which allow the fine powder adhering to the working surface to fall off on its own during rotation, preventing high-fineness materials from remaining and caking in the grinding gaps, and ensuring the stability of continuous operation. This meets the differentiated requirements of different grades of cemented carbide for raw material particle size.

[0053] To more clearly demonstrate the advantages of the present invention compared with the prior art, this embodiment compares and analyzes the key performance indicators of traditional manual operation methods, existing automatic unloading devices, and the present invention.

[0054] Regarding the loading capacity, traditional manual operation uses a loose loading method, which is limited by the extremely low loose density of ultrafine tungsten carbide powder, resulting in a limited loading capacity per boat, typically only 40%-50% of the boat's volume. While existing automatic unloading devices achieve automation, they do not pre-compress the loose powder characteristics, resulting in loading capacities essentially the same as traditional manual operation. This invention, however, uses a weighing and pressing mechanism 2 to pre-compress the loose powder at 500kg, compressing the material into a dense, cake-shaped cylindrical form. This increases the loading capacity per boat by approximately 30%, significantly improving single-furnace capacity and reducing energy costs per unit product.

[0055] Regarding unloading methods, traditional manual operation requires the use of tools such as pry bars and hammers to forcibly peel the adhesive layer between the tungsten carbide lumps and the inner wall of the boat. This is not only labor-intensive and inefficient, but the violent mechanical impact can easily damage the boat, increasing production costs. Existing automatic unloading devices typically use a continuous and rapid tilting method with a large tilting radius and high speed. Although this achieves automated unloading, the lack of a specific design to address the boat adhesion problem means that the lumps may irregularly break during rapid tilting due to excessive impact force, affecting the particle size uniformity of subsequent powder processing. At the same time, rapid tilting exacerbates dust emissions, creating a harsh working environment.

[0056] From the perspective of unloading procedure design: existing continuous overturning schemes treat overturning as a simple material dumping action, with overturning speed and angle being merely general process parameters; while in the segmented overturning procedure of this invention, the angle and action mode of each stage are coupled with the physical characteristics of tungsten carbide block material peeling. 45° corresponds to the mechanical boundary of the static friction critical point broken by the tangential component of gravity, and is combined with low-speed reciprocating micro-motion to generate interface micro-cracks to achieve loosening pre-separation; 180° corresponds to the optimal posture of resonance peeling with the boat mouth facing downward and the excitation force and gravity combined in the same direction; 360° corresponds to the residual cleaning condition of reverse vibration sweeping. The above-mentioned coupling relationship of "angle, action, and mechanism" is not a simple recombination of overturning procedure parameters. No matter how the parameters are adjusted in the continuous overturning scheme, it is impossible to obtain the staged physical process of "micro-crack pre-separation, resonance peeling, and reverse sweeping", and therefore it is impossible to ensure both boat protection and uniform particle size of the discharged material while ensuring the completeness of unloading.

[0057] This invention employs a segmented flipping process, which involves a three-stage coordinated operation of 45° initial loosening, 180° vibration peeling, and 360° secondary cleaning, combined with high-frequency vibration of 50-200Hz, to achieve gentle peeling of materials. This not only completely solves the problem of sticking to the boat, but also avoids damage to the boat and excessive crushing of materials, ensuring the consistency of product particle size.

[0058] Furthermore, the blades of the dual-shaft shredder assembly adopt a detachable quick-change structure, which facilitates rapid replacement after wear; a side-opening maintenance door is opened on the side wall of the shredding chamber to facilitate blade replacement and internal cleaning; an observation window is provided on the top of the shredding chamber to facilitate real-time monitoring of material status during operation, reduce equipment maintenance difficulty, and shorten downtime for maintenance.

[0059] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A fully automated production system for ultrafine tungsten carbide powder, characterized in that, include: The boat-pushing mechanism; The weighing and pressing mechanism is used to receive the material boat under the push of the feeding boat mechanism, verify the weight, and pre-press the material into shape. A carbonization furnace is used to receive a material boat pushed by a feeding and pushing mechanism and to carbonize the pre-compressed material inside it. The material pouring and turning mechanism is used to receive the material boat containing carbonized material pushed by the feeding and pushing mechanism, and to perform a turning action to pour out the material. The planetary feeding shredding mechanism is connected below the material dumping and tilting mechanism and is used to shred and classify the carbonized material dumped into its inner side. The flipping and sealing mechanism is located inside the material flipping mechanism. It is used to isolate the unloading path from the external atmospheric environment during flipping and unloading, so as to form a closed guide space and collect dust.

2. The fully automated production system for ultrafine tungsten carbide powder according to claim 1, characterized in that, The weighing and pressing mechanism includes: The frame integrates an electronic weighing module for verifying the weight of the material boats; The loading cavity, located in the middle of the frame, is used to receive the mixture to be pressed; The upper pressure head assembly is installed on the top of the frame and is driven by the first servo drive to extend into the loading mold cavity to perform the upper pressure operation, so as to press the mixture into a cake-shaped cylindrical material; The demolding assembly, installed at the bottom of the frame, is driven by the second servo drive to extend into the loading mold cavity to perform the demolding operation, so as to push the pressed and formed disc-shaped cylindrical material into the material boat below. The servo control system is electrically connected to the first servo drive and the second servo drive. A dust collection device is installed on the side of the filling mold cavity to collect dust simultaneously during pressing and demolding.

3. The fully automated production system for ultrafine tungsten carbide powder according to claim 1, characterized in that, The material turning mechanism includes: The tilting chamber has a smooth mirror-like contact surface inside. It is sealed with a dust cover on top and a transfer chamber on the bottom. The planetary feeding and shredding mechanism is sealed below the transfer chamber. Two compartmentalized isolation baffles are symmetrically fixed to both sides of the inner wall of the tilting chamber, dividing the inner cavity of the tilting chamber into an upper drive isolation chamber and a lower discharge working chamber. The tilting tube is horizontally installed inside the tilting chamber and located in the drive isolation cavity. One end of the tilting tube that extends to the outside of the tilting chamber is fixedly connected to the drive gear, which is connected to the tilting drive assembly installed outside the tilting chamber.

4. The fully automated production system for ultrafine tungsten carbide powder according to claim 3, characterized in that, The tilting tube is rotatably connected to two tilting tube bearing brackets on both sides of the tilting chamber; a functional window for pouring material is opened on the circumferential wall of the tilting tube; a limiting groove extending axially is provided inside the tilting tube, and the limiting groove slides in conjunction with the limiting protrusion on the outer wall of the material boat; a material boat inlet is provided at one end of the tilting tube, and a material boat outlet is provided at the other end.

5. The fully automated production system for ultrafine tungsten carbide powder according to claim 4, characterized in that, The inner edge of the compartment isolation baffle is arc-shaped and forms a rolling fit with the outer circumference of the tilting tube.

6. The fully automated production system for ultrafine tungsten carbide powder according to claim 3, characterized in that, The flipping sealing mechanism includes: a sealing plate with a built-in negative pressure dust suction interface, the sealing plate is fitted to the bottom of the compartment isolation baffle, one end of the sealing plate is fixedly connected to the rotating shaft, both ends of the rotating shaft are rotatably connected to the flipping chamber through bearings, one end of the rotating shaft that extends out of the flipping chamber is fixedly connected to one end of the force transmission seat, the other end of the force transmission seat is rotatably connected to the output end of the drive cylinder, and the fixed end of the drive cylinder is rotatably connected to the side wall of the flipping chamber.

7. The fully automated production system for ultrafine tungsten carbide powder according to claim 6, characterized in that, The flip drive component includes: The tilt drive motor is located outside the tilt chamber and is driven synchronously by two servo motors. A precision reducer, the input of which is connected to the output of two servo motors; The drive gear is fixed to the output end of the precision reducer and meshes with the driving gear. Among them, the dual servo motors drive the rotating tube to stay at any angle within the range of 0-360° through a precision reducer.

8. The fully automated production system for ultrafine tungsten carbide powder according to claim 7, characterized in that, Dual servo motors drive the flip tube via precision reducers to execute a segmented flipping program; the segmented flipping program includes: Initial loosening stage: The drive tube rotates from the initial position to 45° and stops. The drive tube is then driven to swing slightly around the 45° position in a low-speed reciprocating micro-motion manner, so that the adhesion interface between the blocky material in the material boat and the inner wall of the boat will produce micro-cracks and loosen. Complete peeling stage: The drive tube continues to rotate until it stops at 180°, and works in conjunction with the vibration device installed on the tube to peel the material from the inner wall of the material boat; the vibration frequency of the vibration device is 50-200Hz; Secondary cleaning stage: Drive the tilting tube to rotate to 360°, and use the vibration device to clean the residual material in the boat by reverse vibration, so as to complete the unloading and resetting.

9. The fully automated production system for ultrafine tungsten carbide powder according to claim 8, characterized in that, During the segmented flipping process, the vibration device is in the open state when the flipping tube is in the 180° stop state and in the 360° rotation state, and collects dust in real time through the negative pressure dust suction interface on the sealing plate in conjunction with the negative pressure system.

10. The fully automated production system for ultrafine tungsten carbide powder according to claim 9, characterized in that, The planetary feeding shredding mechanism includes: a planetary feeding unit, which adopts a spiral propulsion structure and is driven by a feeding servo motor. The feeding servo motor is used to control the frequency of material entering the shredding chamber according to a preset speed, so as to ensure uniform output of blocky material and avoid blockage. A multi-stage shredding unit is located below the planetary feeder unit; the multi-stage shredding unit includes: The first-stage dual-shaft shredder assembly is used to shred blocky materials to 5-10mm; The second-stage planetary grinding head is located below the dual-shaft shredder assembly and is used to further refine the material to 100-500µm. The circulating classification mechanism is located below the second-stage planetary grinding head. The circulating classification mechanism has a qualified powder outlet and an unqualified material return outlet. The unqualified material return outlet is connected to the feed end of the planetary feeding unit to automatically return materials that do not meet the particle size requirements for secondary shredding.

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