A raw material screening device and method for powder metallurgy processing

Abstract

The application relates to the technical field of screening, in particular to a raw material screening device and method for powder metallurgy processing, which comprises a feeding assembly and an anti-blocking assembly. The feeding assembly is arranged on one side of a supporting box. The anti-blocking assembly comprises a first mover, a moving rod, a plurality of pulse nozzles, a connecting pipe and a gas pulse generating structure. The first mover is slidingly arranged below a screen. The moving rod is fixed on the first mover. The plurality of pulse nozzles are distributed on the moving rod and used for spraying pulse gas upward to the screen. The connecting pipe is connected with the plurality of pulse nozzles. The gas pulse generating structure is connected with the connecting pipe. The screen holes can be instantaneously impacted and cleaned, so that the powder blocked in the screen holes is blown off, the permeability of the screen is restored, and the self-cleaning capacity and operation stability of the equipment are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screening, in particular to a raw material screening device and method for powder metallurgy processing. BACKGROUND

[0002] In the powder metallurgy process, raw material screening is a key pretreatment step to ensure uniform particle size of metal powder, impurity removal and subsequent forming quality. By using standard screens with different pore sizes, the original powder is classified by particle size, and oversized particles, agglomerates or foreign matter are removed to obtain a particle size distribution that meets the process requirements.

[0003] During the screening operation, the raw material is prone to accumulate, adhere or jam in the screen holes, causing screen clogging. This clogging not only significantly reduces the screening efficiency, affects production continuity and product quality, but also can cause abnormal equipment load and increase energy consumption. Currently, the industry generally uses a cleaning brush set on the surface of the screen to clean the clogging by direct contact between the bristles and the screen surface during screen operation. However, this mechanical cleaning method has obvious drawbacks: on the one hand, the cleaning brush continuously rubs the screen surface in high-frequency reciprocating or rotating motion, which can easily cause screen surface wear, screen hole deformation or even rupture; on the other hand, if the cleaning brush is too hard or the installation tension is too high, it can further damage the screen. Over time, the structural integrity and screening accuracy of the screen are difficult to guarantee, the service life is significantly shortened, and this leads to frequent replacement of the screen, increased maintenance costs and downtime. SUMMARY

[0004] The present application aims to provide a raw material screening device and method for powder metallurgy processing, which can perform instantaneous impact cleaning on the screen holes to blow off the powder clogged in the screen holes, restore the screen permeability and improve the self-cleaning ability and operation stability of the equipment.

[0005] To achieve the above object, in a first aspect, the application provides a raw material screening device for powder metallurgy processing, comprising a base, a support box, a screen and a vibrator, the support box is arranged on the base, the screen is arranged in the support box, the vibrator is used to drive the screen to vibrate, further comprising a feeding assembly and an anti-blocking assembly, the feeding assembly is arranged on one side of the support box, the anti-blocking assembly comprises a first mover, a moving rod, a plurality of pulse nozzles, a connecting pipe and a gas pulse generating structure, the first mover is slidingly arranged below the screen, the moving rod is fixed on the first mover, a plurality of the pulse nozzles are distributed on the moving rod and used to spray pulse gas upward to the screen, the connecting pipe is connected with the plurality of pulse nozzles, and the gas pulse generating structure is connected with the connecting pipe; the feeding assembly comprises a material box, a feeding pipe, a distribution plate, a hose, a second mover and a scraper, the material box is arranged above the support box, the feeding pipe is in communication with the material box, the second mover is slidingly arranged in the support box, the distribution plate is connected with the second mover, the hose is in communication with the distribution plate and the feeding pipe, the distribution plate is provided with an inclined flow channel, a plurality of leakage holes are distributed on the inclined flow channel, and the scraper is arranged on the second mover and used to clean the screen; the material box is fixedly arranged above the support box and used to temporarily store the metal powder raw material to be screened, the bottom of the material box is provided with a controllable discharge port, and the discharge rate can be adjusted; the feeding pipe is used to guide the raw material from the material box to the distribution area; the distribution plate is arranged above the screen and keeps communication with the feeding pipe through the hose to adapt to the movement requirement of the distribution plate during operation and avoid stress concentration or sealing failure caused by rigid connection; the distribution plate is provided with an inclined flow channel arranged obliquely, the inclined flow channel extends along the length direction of the distribution plate, and a plurality of leakage holes are uniformly distributed on the bottom surface or the side wall of the inclined flow channel, so that the raw material can smoothly slide along the inclined flow channel under the action of gravity and flow inertia.

[0006] The first mover comprises a first moving block, a first rack, a first gear and a first motor, the first moving block is slidingly arranged below the screen, the first gear is rotationally arranged on the first moving block, the first rack is fixed in the support box and engaged with the first gear, and the output end of the first motor is connected with the first gear.

[0007] The first mover further comprises a cleaning brush, the cleaning brush is arranged on both sides of the first moving block and used to clean the raw material remaining on the first rack.

[0008] The second mover comprises a second moving block, a screw rod and a second motor, the second moving block is slidingly arranged in the support box, the screw rod is threadedly connected with the second moving block, and the output end of the second motor is connected with the screw rod.

[0009] The second mover further comprises a dust removal ring arranged on both sides of the second moving block.

[0010] The scraper comprises a connecting rod, a control cylinder, a sliding rod, an elastic member, a scraper plate and a temporary storage box, the connecting rod is connected with the second moving block, the control cylinder is arranged on the connecting rod, the sliding rod is slidingly arranged on the output end of the control cylinder, the elastic member is arranged between the control cylinder and the sliding rod, the scraper plate is fixed at the bottom of the sliding rod, and the temporary storage box is arranged on one side of the scraper plate and used for collecting and screening the raw materials concentrated on the scraper plate.

[0011] The temporary storage box comprises a box body, an agitating rod and a counterweight, the box body is rotatably arranged on one side of the scraper plate, the agitating rod is rotatably arranged in the box body, and the counterweight is arranged below the box body.

[0012] The temporary storage box further comprises a second gear, a second rack and a storage box, the storage box is fixed on one side of the support box, the second gear is fixed on the box body, the second rack is fixed on the support box and arranged on one side of the storage box, when the box body moves to the position of the second rack, the second gear drives the box body to rotate under the action of the second rack, so that the raw materials in the box body that do not pass through the leakage hole are poured into the storage box for storage.

[0013] In the second aspect, the application further provides a raw material screening method for powder metallurgy processing, which adopts the raw material screening device for powder metallurgy processing.

[0014] The raw material screening device and method for powder metallurgy processing are characterized in that the support box is stably installed on the base and serves as a main frame of the entire screening structure, the screen is horizontally or obliquely arranged in the support box and used for grading and screening the powder metallurgy raw materials, and the vibrator is installed on the side or bottom of the support box or the screen and drives the screen to continuously vibrate by generating high-frequency vibration, so as to promote the uniform distribution and rapid passing of the materials on the screen surface and improve the screening efficiency.

[0015] The feeding assembly is arranged on one side of the support box and can adopt screw conveying, vibration feeding or pneumatic conveying, so as to realize the automatic, continuous and controllable feeding of the raw materials into the screening area and avoid the unevenness and safety hazards caused by manual feeding.

[0016] The anti-blocking assembly can effectively prevent the screen from being blocked due to fine powder accumulation or material adhesion during long-time operation. The first mover is arranged below the screen in a sliding manner and can reciprocate along the length direction of the screen under the driving of a driving mechanism (such as a motor or a pneumatic cylinder); the moving rod is fixedly connected to the first mover and spans below the screen; a plurality of pulse nozzles are uniformly distributed and fixedly installed on the moving rod, the nozzles are upward and face the bottom of the screen; the connecting pipe connects all the pulse nozzles and is connected with an external gas pulse generating structure. The gas pulse generating structure (such as a high-pressure gas tank matched with a solenoid valve or a special pulse valve) can periodically release a short and high-pressure gas pulse into the connecting pipe, which is upwardly sprayed through each pulse nozzle to instantaneously impact and clean the screen holes, so as to blow off the powder blocked in the screen holes and restore the permeability of the screen.

[0017] In summary, the present application combines the vibration screening with the dynamic pulse unblocking technology, which not only realizes the efficient and continuous screening of the powder metallurgy raw materials, but also significantly improves the self-cleaning ability and operation stability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 is a structural diagram of a raw material screening device for powder metallurgy processing.

[0020] Figure 2 is a first cross-sectional structural diagram of a raw material screening device for powder metallurgy processing.

[0021] Figure 3 is Figure 2 Partial enlarged view of detail A.

[0022] Figure 4 is a second cross-sectional structural diagram of a raw material screening device for powder metallurgy processing.

[0023] Figure 5 is a third cross-sectional structural diagram of a raw material screening device for powder metallurgy processing.

[0024] Figure 6 is Figure 5 Partial enlarged view of detail B.

[0025] The base 101, the support box 102, the screen 103, the vibrator 104, the first mover 105, the moving rod 106, the pulse spray head 107, the connecting pipe 108, the gas pulse generating structure 109, the first moving block 110, the first rack 111, the first gear 112, the first motor 113, the cleaning brush 114, the material box 115, the feeding pipe 116, the cloth distribution plate 117, the hose 118, the second mover 119, the material scraper 120, the second moving block 121, the screw 122, the second motor 123, the dust removal ring 124, the connecting rod 125, the control cylinder 126, the sliding rod 127, the elastic member 128, the scraper 129, the temporary storage box 130, the box body 131, the stirring rod 132, the counterweight 133, the second gear 134, the second rack 135, and the storage box 136. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0027] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0028] First Embodiment

[0029] Please refer to Figures 1-6The application provides a raw material screening device for powder metallurgy processing, which comprises a base 101, a support box 102, a screen 103 and a vibrator 104, the support box 102 is arranged on the base 101, the screen 103 is arranged in the support box 102, and the vibrator 104 is used for driving the screen 103 to vibrate, and the device further comprises a feeding assembly and an anti-blocking assembly, the feeding assembly is arranged on one side of the support box 102, and the anti-blocking assembly comprises a first mover 105, a moving rod 106, a plurality of pulse nozzles 107, a connecting pipe 108 and a gas pulse generating structure 109, the first mover 105 is slidingly arranged below the screen 103, the moving rod 106 is fixed on the first mover 105, the plurality of pulse nozzles 107 are distributed on the moving rod 106 and used for spraying pulse gas upward to the screen 103, the connecting pipe 108 is connected with the plurality of pulse nozzles 107, and the gas pulse generating structure 109 is connected with the connecting pipe 108.

[0030] In the embodiment, the support box 102 is stably mounted on the base 101 and serves as a main frame of the whole screening structure, the screen 103 is horizontally or obliquely arranged in the support box 102 and used for grading and screening the powder metallurgy raw material, and the vibrator 104 is mounted on the side or bottom of the support box 102 or the screen 103 and drives the screen 103 to continuously vibrate by generating high-frequency vibration, so that the uniform distribution and rapid passing of the material on the screen surface are promoted, and the screening efficiency is improved.

[0031] The feeding assembly is arranged on one side of the support box 102 and can adopt screw conveying, vibration feeding or pneumatic conveying, so that the raw material can be automatically, continuously and controllably fed into the screening area, and the unevenness and safety hazards caused by manual feeding are avoided.

[0032] The anti-blocking assembly can effectively prevent the screen 103 from being blocked due to fine powder accumulation or material adhesion during long-time operation. The first mover 105 is slidingly arranged below the screen 103 and can reciprocally move along the length direction of the screen 103 under the drive of a driving mechanism such as a motor or an air cylinder; the moving rod 106 is fixedly connected to the first mover 105 and crosses below the screen 103; the plurality of pulse nozzles 107 are uniformly distributed and fixedly arranged on the moving rod 106, the nozzles are upward and face the bottom of the screen 103; and the connecting pipe 108 connects all the pulse nozzles 107 in series and is connected with the external gas pulse generating structure 109. The gas pulse generating structure 109 such as a high-pressure gas storage tank matched with a solenoid valve or a special pulse valve can periodically release short and high-pressure gas pulses into the connecting pipe 108, the gas pulses are upwardly sprayed through the pulse nozzles 107, the screen 103 holes are instantaneously impacted and cleaned, and the powder blocked in the screen holes is blown off, so that the permeability of the screen 103 is restored.

[0033] In summary, the application combines vibration screening with dynamic pulse unblocking technology, which not only realizes efficient and continuous screening of powder metallurgy raw materials, but also significantly improves the self-cleaning ability and operation stability of the equipment.

[0034] The first mover 105 includes a first moving block 110, a first rack 111, a first gear 112, and a first motor 113, the first moving block 110 is slidingly arranged below the screen 103, the first gear 112 is rotatably arranged on the first moving block 110, the first rack 111 is fixed in the support box 102 and engaged with the first gear 112, and the output end of the first motor 113 is connected with the first gear 112.

[0035] The first moving block 110 is slidably installed below the screen 103, usually through a guide rail or chute structure cooperating with the inner wall of the support box 102 to ensure smooth and low-friction reciprocating movement in the horizontal direction; the first rack 111 is fixedly installed on the inner side wall or bottom frame of the support box 102 along the length direction of the screen 103, and the position corresponds to the movement track of the first moving block 110; the first gear 112 is rotatably installed on the first moving block 110 and engaged with the first rack 111 to form a gear and rack transmission pair; the first motor 113 is fixed on the first moving block 110, and the output shaft thereof is coaxially connected with the first gear 112 for driving the first gear 112 to rotate. When the first motor 113 rotates forward or reversely, the rotary motion is converted into linear reciprocating motion of the first moving block 110 along the first rack 111 through the engagement transmission of the gear and rack, thereby driving the moving rod 106 and the pulse nozzle 107 above to move periodically and sweepingly below the screen 103, achieving uniform and efficient pulse unblocking of the whole area of the screen 103.

[0036] The first mover 105 further includes a cleaning brush 114 arranged on both sides of the first moving block 110 for cleaning the raw materials remaining on the first rack 111.

[0037] To further improve the long-term operation reliability of the device and prevent powder metallurgy raw materials from falling into the transmission mechanism during operation and causing jamming or wear, the first mover 105 is additionally provided with a cleaning brush 114. The cleaning brush 114 is symmetrically arranged on both sides of the first moving block 110, and the bristles or blades thereof are in close contact with the tooth surface or adjacent area of the first rack 111. During the movement of the first moving block 110 along the rack, the cleaning brush 114 synchronously scrapes the surface of the rack to timely remove the metal powder, dust or other residues that may be attached or accumulated in the tooth groove of the rack, effectively preventing foreign matters from entering the gear engagement area, thereby ensuring smooth operation of the transmission system, prolonging the service life of the equipment, and reducing the maintenance frequency.

[0038] The feeding assembly comprises a hopper 115, a feeding pipe 116, a distributing plate 117, a hose 118, a second mover 119 and a scraper 120. The hopper 115 is arranged above the support box 102, the feeding pipe 116 is in communication with the hopper 115, the second mover 119 is slidingly arranged in the support box 102, the distributing plate 117 is connected with the second mover 119, the hose 118 is in communication with the distributing plate 117 and the feeding pipe 116, and the distributing plate 117 is provided with an inclined flow channel, and a plurality of leakage holes are distributed on the inclined flow channel.

[0039] The hopper 115 is fixedly arranged above the support box 102 and is used for temporarily storing the metal powder raw material to be screened. The bottom of the hopper 115 is provided with a controllable discharge port, so as to facilitate the adjustment of the discharging rate. One end of the feeding pipe 116 is in communication with the bottom of the hopper 115, and the other end is connected with the distributing plate 117 in a flexible connection mode, so as to guide the raw material from the hopper 115 to the distributing area. The distributing plate 117 is a key component directly participating in the distribution of the material, is horizontally or slightly inclined arranged above the screen 103, and is in communication with the feeding pipe 116 through the hose 118, so as to adapt to the movement requirement of the distributing plate 117 in the running process and avoid stress concentration or sealing failure caused by rigid connection.

[0040] The distributing plate 117 is provided with an inclined flow channel arranged in an inclined manner. The inclined flow channel extends along the length direction of the distributing plate 117, and the inner wall thereof is polished or treated with a low-friction material, so as to reduce the adhesion of the powder. A plurality of leakage holes are uniformly distributed on the bottom surface or the side wall of the inclined flow channel, so that the raw material can smoothly slide along the inclined flow channel under the action of gravity and flow inertia, and is uniformly and dispersedly scattered on the entire effective screening area of the lower screen 103 through the leakage holes, thereby avoiding the problems of local accumulation or insufficient utilization of the screen surface.

[0041] The second mover 119 comprises a second moving block 121, a screw rod 122 and a second motor 123. The second moving block 121 is slidingly arranged in the support box 102, the screw rod 122 is threadedly connected with the second moving block 121, and the output end of the second motor 123 is connected with the screw rod 122.

[0042] To achieve the reciprocating movement of the cloth plate 117 in the width direction of the screen 103 to further improve the cloth uniformity, the second mover 119 is provided. The second mover 119 includes a second moving block 121, a screw rod 122 and a second motor 123. The second moving block 121 is slidably arranged inside the support box 102 through a slide rail or guide groove structure and can move smoothly in the transverse direction of the screen 103; the screw rod 122 is horizontally arranged in the support box 102 and connected with the second moving block 121 through a precision threaded pair; the second motor 123 is fixedly installed at one end of the support box 102, and the output shaft thereof is coaxially connected with the screw rod 122. When the second motor 123 is started, the screw rod 122 is driven to rotate, and the second moving block 121 and the cloth plate 117 connected therewith are driven to move uniformly and reciprocally in the transverse direction of the screen 103, so as to realize “dynamic cloth distribution”-i.e. the raw materials are continuously and uniformly distributed on the screen surface during the movement, thereby significantly improving the screening efficiency and consistency.

[0043] The second mover 119 further includes a dust removal ring 124 arranged on both sides of the second moving block 121.

[0044] Considering that the fine powder generated in the powder metallurgy process is easy to accumulate around the moving mechanism and even invade the transmission components to cause jamming or wear, the second mover 119 is further specially configured with the dust removal ring 124. The dust removal ring 124 is symmetrically installed on both sides of the second moving block 121 and is usually made of elastic sealing material (such as polyurethane or silicone), and the inner edge thereof is tightly attached to the inner wall of the support box 102 or the surface of the guide rail. During the movement of the second moving block 121, the dust removal ring 124 synchronously scrapes off the dust attached to the inner wall of the guide rail or the box, and at the same time forms a local sealing barrier to effectively prevent external dust from entering the precision motion pair area of the screw rod 122 and the slide rail. This design not only improves the dustproof performance of the equipment, but also significantly enhances the reliability and maintenance convenience during long-term operation.

[0045] The scraper 120 includes a connecting rod 125, a control cylinder 126, a sliding rod 127, an elastic member 128, a scraper plate 129 and a temporary storage box 130. The connecting rod 125 is connected with the second moving block 121, the control cylinder 126 is arranged on the connecting rod 125, the sliding rod 127 is slidably arranged on the output end of the control cylinder 126, the elastic member 128 is arranged between the control cylinder 126 and the sliding rod 127, the scraper plate 129 is fixed at the bottom of the sliding rod 127, and the temporary storage box 130 is arranged on one side of the scraper plate 129 for storing the raw materials concentrated on the scraper plate 129 and performing screening.

[0046] One end of the connecting rod 125 is firmly connected to the second moving block 121, and moves reciprocatingly above the screen 103 with the second moving block 121, so as to drive the whole scraper 120 to move synchronously along the length direction of the screen 103, and realize full coverage cleaning operation on the screen surface.

[0047] The control cylinder 126 is fixedly installed on the connecting rod 125, the cylinder body thereof is arranged downward, and the output end (piston rod) extends vertically downward. The sliding rod 127 is slidably sleeved on the piston rod of the control cylinder 126, or cooperates with the guide sleeve, to ensure smooth movement in the vertical direction. The elastic element 128 (such as a compression spring or a rubber buffer pad) is arranged between the cylinder body of the control cylinder 126 and the sliding rod 127, which can provide flexible buffering when the scraper 129 contacts the screen 103, to avoid damaging the surface of the screen 103 due to rigid impact, and can maintain moderate adhesion pressure between the scraper 129 and the screen 103 when the control cylinder 126 is not in action, to ensure the scraping effect.

[0048] The scraper 129 is fixedly installed at the bottom of the sliding rod 127, and is preferably made of engineering plastic (such as polytetrafluoroethylene) or soft alloy which is wear-resistant, low-friction and does not damage the screen 103, and the edge of the scraping blade is rounded or polished, which can effectively scrape off the powder lumps or large particle impurities adhered on the screen 103, and will not scratch the hole structure of the screen 103. Under the driving of the first moving block 110, the scraper 129 moves slowly along the surface of the screen 103, to concentrate and push the accumulated material to the designated area.

[0049] In order to realize effective recovery and reprocessing of the scraped material, the temporary storage box 130 is arranged behind the scraper 129, the opening of which faces the movement path of the scraper 129, and is used for receiving and temporarily storing the raw materials pushed by the scraper 129. The bottom of the temporary storage box 130 can be provided with a micro-porous screen 103 or a channel communicated with the main screening system, so that the collected material can re-enter the screening process for secondary screening, to avoid waste of effective components; and the material with obviously oversized particle diameter or more impurities is stored in the temporary storage box 130.

[0050] The temporary storage box 130 comprises a box body 131, an agitating rod 132 and a counterweight 133, the box body 131 is rotatably arranged on one side of the scraper 129, the agitating rod 132 is rotatably arranged in the box body 131, and the counterweight 133 is arranged below the box body 131.

[0051] The box body 131 is a cavity structure with an open upper part and a closed bottom part. One side of the box body 131 is rotatably installed on the side of the scraper 129 through a rotating shaft, so that the box body 131 can rotate around the shaft within a certain angle range to realize the function cycle of "material receiving - stirring - pouring". Inside the box body 131, one or more stirring rods 132 are arranged. The stirring rods 132 are rotatably installed between the side walls of the box body 131 through bearings and can be driven to rotate by a micro motor or inertial force generated by the movement of the box body 131. When the scraper 129 pushes the large particles or agglomerated materials on the screen surface that do not pass through the screen holes into the box body 131, the stirring rods 132 slightly stir the materials during rotation to prevent them from being compacted or bridged in the box, ensuring smooth subsequent pouring.

[0052] To ensure that the box body 131 always maintains a stable material receiving posture with the opening facing upward in the non-discharging state, the application sets a counterweight 133 at the bottom of the box body 131 or below the rotating shaft. The counterweight 133 is usually made of high-density metal materials such as cast iron or tungsten alloy. The center of gravity position is accurately calculated so that the box body 131 automatically resets to the horizontal material receiving position under the action of gravity in the natural state. Even during equipment vibration or movement, it can remain stable and effectively avoid material spillage.

[0053] The temporary storage box 130 also includes a second gear 134, a second rack 135, and a storage box 136. The storage box 136 is fixed on one side of the support box 102. The second gear 134 is fixed on the box body 131. The second rack 135 is fixed on the support box 102 and is arranged on one side of the storage box 136. When the box body 131 moves to the position of the second rack 135, the second gear 134 drives the box body 131 to rotate under the action of the second rack 135, so that the raw materials in the box body 131 that do not pass through the screen holes are poured into the storage box 136 for storage.

[0054] To realize automatic discharging of the materials in the temporary storage box 130, the temporary storage box 130 also integrates a second gear 134, a second rack 135, and a storage box 136. The storage box 136 is fixedly installed on one side of the support box 102 to centrally collect large particle raw materials or impurities that do not pass through the screen holes of the screen 103, facilitating subsequent centralized processing or rework screening. The second gear 134 is coaxially fixed on the rotating shaft of the box body 131 and rotates synchronously with the box body 131. The second rack 135 is vertically or obliquely fixed on the inner wall of the support box 102 and is accurately arranged at the corresponding position of the inlet of the storage box 136.

[0055] When the first moving block 110 drives the scraper 120 (including the temporary storage box 130) to move along the screen 103 to the preset unloading area close to the storage box 136, the second gear 134 on the box body 131 is just engaged with the second gear rack 135 fixed on the support box 102. As the first moving block 110 continues to move forward, the second gear rack 135 applies a pushing force to the second gear 134, driving the box body 131 to rotate a certain angle (usually 30°-90°) upward or outward around its rotating shaft, so as to dump the temporarily stored un-screened material in the box body 131 into the storage box 136 below. After unloading is completed, the first moving block 110 moves reversely or moves away from the gear rack area, and the box body 131 is automatically rotated back to the initial material receiving posture under the gravity of the counterweight 133, preparing for the next scraping and collecting cycle.

[0056] The unloading mechanism does not need to additionally set a driving motor or complex control logic, and can automatically dump only by mechanical engagement in the moving process, so that the structure is simple, the reliability is high, and the energy consumption is low, and is particularly suitable for long-term stable operation in a dusty environment.

[0057] Second embodiment

[0058] The application also provides a raw material screening method for powder metallurgy processing, which adopts the raw material screening device for powder metallurgy processing.

[0059] The screening method takes the screening device as a hardware basis, forms a closed-loop, intelligent and self-maintaining screening operation system through multi-module cooperative control and process flow optimization. The core is to organically integrate automatic feeding, uniform distribution, efficient screening, dynamic anti-blocking, residual cleaning, material classification and recycling, and equipment self-cleaning of the raw material, so as to overcome the problems of screen 103 blockage, uneven distribution, dust dispersion, frequent manual intervention and screening efficiency fluctuation in the traditional screening process.

[0060] In actual operation, first, the powder metallurgy raw material to be processed is put into the material box 115 located above the support box 102. By controlling the second mover 119 in the feeding assembly, the distribution plate 117 moves transversely and reciprocally above the screen 103, and cooperates with the inclined flow channel and porous structure arranged on the distribution plate 117, to realize dynamic and uniform distribution of the raw material, effectively avoiding local accumulation or insufficient utilization of the screen surface. Subsequently, the vibrator 104 is started to drive the screen 103 to vibrate at a high frequency, promoting the fine powder to quickly pass through the screen, and the large particles or agglomerates are intercepted on the screen surface.

[0061] At the same time, the anti-blocking assembly is synchronously operated: the first mover 105 drives the pulse nozzle 107 to longitudinally scan below the screen 103, and the gas pulse generating structure 109 periodically releases high-pressure gas flow to instantaneously impact and clean the screen holes, preventing fine powder from blocking; the scraper 120 automatically presses down at a set period or after the screening is completed, and pushes the screen surface residues into the temporary storage box 130 through the scraper 129. When the temporary storage box 130 moves to the unloading station, it is automatically dumped by means of gear and rack meshing, and the un-screened material is guided into the storage box 136, completing classification and collection. During the entire process, the dust ring 124 and the cleaning brush 114 continuously protect the transmission mechanism from dust, ensuring long-term stable operation of the equipment.

[0062] The screening method not only improves the screening precision and efficiency, but also significantly enhances the automation and intelligence level of the system, and is suitable for high-end powder metallurgy application scenarios with strict particle size control requirements, such as aerospace, medical devices, new energy battery electrode materials and other fields. Through the method, the screened powder can ensure good particle size consistency, high purity and excellent forming performance, providing high-quality raw material guarantee for subsequent pressing, sintering and other processes.

[0063] The above disclosure is only one preferred embodiment of the present application, and of course cannot limit the scope of the rights of the present application. Those skilled in the art can understand that the entire or partial processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present application still fall within the scope of the present application.

Claims

1. A raw material screening device for powder metallurgy processing, comprising a base, a support box, a screen, and a vibrator, wherein the support box is disposed on the base, the screen is disposed inside the support box, and the vibrator is used to drive the screen to vibrate, characterized in that, It also includes a feeding assembly and an anti-clogging assembly. The feeding assembly is located on one side of the support box. The anti-clogging assembly includes a first mover, a moving rod, multiple pulse nozzles, a connecting pipe, and a gas pulse generating structure. The first mover is slidably disposed below the screen, the moving rod is fixed to the first mover, and the multiple pulse nozzles are distributed on the moving rod for spraying pulsed gas upwards onto the screen. The connecting pipe is connected to the multiple pulse nozzles, and the gas pulse generating structure is connected to the connecting pipe. The feeding assembly includes a material box, a feeding pipe, a material distribution plate, a hose, a second mover, and a scraper. The material hopper is positioned above the support box, and the feeding pipe is connected to the material hopper. The second mover is slidably disposed within the support box. The material distribution plate is connected to the second mover, and the flexible hose is connected to both the material distribution plate and the feeding pipe. The material distribution plate is provided with an inclined flow channel, on which multiple perforations are distributed. The scraper is mounted on the second mover and is used to clean the screen. The material hopper is fixedly positioned above the support box and is used to temporarily store the metal powder raw material to be screened. It has a controllable discharge port at its bottom for easy adjustment of the feeding rate. The feeding pipe is used to guide the raw material from the material hopper to the material distribution area. The distribution plate is positioned above the screen and connected to the feed pipe via a flexible hose to accommodate its movement during operation, while avoiding stress concentration or sealing failure caused by rigid connections. The distribution plate has inclined channels extending along its length, with multiple evenly distributed perforations on its bottom or sidewalls, allowing the raw material to slide smoothly down the channels under gravity and flow inertia. The scraper includes a connecting rod, a control cylinder, a sliding rod, an elastic element, a scraper, and a temporary storage box. The second mover includes a second moving block, a screw, and a second motor. The connecting rod is connected to the second... The moving block is connected, the control cylinder is mounted on the connecting rod, the sliding rod is slidably mounted on the output end of the control cylinder, the elastic element is mounted between the control cylinder and the sliding rod, the scraper is fixed to the bottom of the sliding rod, and the temporary storage box is mounted on one side of the scraper for collecting the raw materials concentrated by the scraper and screening them. The bottom of the temporary storage box is provided with a microporous screen or a channel communicating with the main screening system. The temporary storage box includes a box body, a stirring rod and a counterweight. The box body is rotatably mounted on one side of the scraper, the stirring rod is rotatably mounted inside the box body, and the counterweight is mounted below the box body.

2. The raw material screening device for powder metallurgy processing as described in claim 1, characterized in that, The first moving device includes a first moving block, a first rack, a first gear, and a first motor. The first moving block is slidably disposed below the screen, the first gear is rotatably disposed on the first moving block, the first rack is fixed in the support box and meshes with the first gear, and the output end of the first motor is connected to the first gear.

3. The raw material screening device for powder metallurgy processing as described in claim 2, characterized in that, The first mover also includes cleaning brushes, which are disposed on both sides of the first moving block and are used to clean the raw materials remaining on the first rack.

4. The raw material screening device for powder metallurgy processing as described in claim 3, characterized in that, The second movable block is slidably disposed inside the support box, the screw is threadedly connected to the second movable block, and the output end of the second motor is connected to the screw.

5. The raw material screening device for powder metallurgy processing as described in claim 4, characterized in that, The second mover also includes dust removal rings, which are disposed on both sides of the second moving block.

6. The raw material screening device for powder metallurgy processing as described in claim 5, characterized in that, The temporary storage box also includes a second gear, a second rack, and a storage box. The storage box is fixed to one side of the support box, the second gear is fixed to the box body, and the second rack is fixed to the support box and disposed on one side of the storage box. When the box body moves to the position of the second rack, the second gear drives the box body to rotate under the action of the second rack, so that the raw materials in the box body that have not passed through the leakage hole are poured into the storage box for storage.

7. A method for screening raw materials for powder metallurgy processing, characterized in that, The raw material screening device for powder metallurgy processing described in any one of claims 1 to 6 is adopted.

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