A screening device for metal additive production

Abstract

The present invention relates to the technical field of metal additive screening. The present invention provides a screening device for metal additive production, comprising a screen box, a main screen, and a pre-screen for distribution. The main screen is disposed within the screen box and is used to screen material. The pre-screen for distribution is disposed above the feed end of the main screen. The mesh size of the pre-screen for distribution is larger than that of the main screen. The height of the pre-screen for distribution gradually decreases from the middle to the sides. The pre-screen for distribution can receive material through the middle, allowing the material to spread to the sides before being screened out and falling onto the main screen. This technical solution solves the technical problem in related technologies of concentrated material dumping locations and difficulty in evenly spreading the material on the screen.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of metal additive screening, and in particular, to a screening device for metal additive production. Background Art

[0002] In modern industrial production, metal additives, as substances that effectively improve the properties of metal materials, are widely used in many fields, including metallurgy and machinery manufacturing. During the steelmaking process, adding the right amount of additives can significantly improve the strength, toughness, and corrosion resistance of steel, meeting the diverse performance requirements of different engineering scenarios.

[0003] Currently, traditional screening devices are still widely used in the metal additive production industry. These devices typically load the material by pouring it over one end of the screen. However, due to the relatively concentrated pouring location, the material is difficult to spread evenly across the screen. This results in excessive material accumulation in some areas of the screen, while sparse material in others. This prevents the screen from being fully and effectively utilized. Accumulated material is difficult to screen, while sparse material areas may be overscreened, resulting in substandard product particle size and poor screening performance.

[0004] The existing technology has not solved the above problems well, which has brought troubles to the normal work in this field. Therefore, there is an urgent need for a screening device for metal additive production to solve the above problems. Summary of the Invention

[0005] To overcome the above-mentioned defects, an embodiment of the present invention provides a screening device for metal additive production, which solves the technical problem in the related art that the material dumping position is concentrated and it is difficult to spread evenly on the screen.

[0006] According to one aspect, at least one embodiment of the present invention provides a screening device for metal additive production, comprising a screen box, a main screen and a cloth pre-screen, wherein the main screen is arranged in the screen box for screening materials, and the cloth pre-screen is arranged above the feeding end of the main screen, the mesh size of the cloth pre-screen is larger than the mesh size of the main screen, the height of the cloth pre-screen gradually decreases from the middle to both ends, the middle part of the cloth pre-screen is used to receive materials, and the cloth pre-screen can guide the materials to spread from the middle to both ends and be sieved onto the main screen.

[0007] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0008] The feeding end of the main screen is provided with a mounting frame, which is arc-shaped. The mounting frame is used to install the cloth pre-screen so that the cloth pre-screen extends in an arc shape from the middle to both ends. A plurality of pressing plates are movably provided on the mounting frame, and the pressing plates are used to press the cloth pre-screen tightly and fix it on the mounting frame.

[0009] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0010] Adjustment nuts are rotatably provided at both ends of the mounting frame, and an adjustment screw is passed through the two adjustment nuts. The two ends of the adjustment screw have threads with opposite rotation directions. The two ends of the adjustment screw are respectively threadedly connected to the two adjustment nuts. The adjustment screw can drive the two adjustment nuts to move closer or farther away to adjust the arch curvature of the mounting frame.

[0011] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0012] The mounting frame is provided with a plurality of supporting ribs, and the supporting ribs are used to support the bottom surface of the cloth pre-screen. The mounting frame is also provided with a feed hopper, and the feed hopper is used to guide the material to the middle of the cloth pre-screen.

[0013] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0014] The material pre-screen is arranged along the width direction of the main screen, and the main screen includes a receiving plate for receiving the material screened by the material pre-screen and a screening plate connected to the receiving plate. A material vertical plate is provided adjacent to the receiving plate and the screening plate and is movable along the width direction of the main screen. The material vertical plate has a plurality of material holes, and the material vertical plate is configured to be able to move back and forth along the width direction of the main screen to disperse the material onto the screening plate with the help of the material holes.

[0015] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0016] Vibration mechanism, the vibration mechanism includes a swing rod, a knock rod and a vibration motor, the middle portion of the swing rod is hinged to the side wall of the screen box, the vibration motor is mounted on the bottom end of the swing rod, the middle portion of the knock rod is provided at the top end of the swing rod;

[0017] The swing rod is configured to swing back and forth under the drive of the vibration motor, and alternately knock the bottom surface of the main screen with the help of the two ends of the knocking rod to make the main screen vibrate.

[0018] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0019] A guide wheel is rotatably provided on the side of the material distribution vertical plate, and two guide wheels are provided and are respectively arranged near the two ends of the material distribution vertical plate. Guide plates are provided on the inner walls of both sides of the screen box. The guide plate on one side extends in an arc shape above the central axis side of the main screen, and the guide plate on the other side extends in an arc shape below the central axis side of the main screen. The two guide wheels are respectively in contact with the two guide plates;

[0020] The guide wheel is configured to be able to roll on the guide plate under the drive of the main screen, so that the material distribution plate can reciprocate along the width direction of the main screen.

[0021] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0022] A deblocking assembly is located below the main screen, and the deblocking assembly includes a support rail arranged on the inner side wall of the screen box, a slider sliding on the support rail, and a negative pressure tube arranged on the slider. The support rail extends along the length direction of the main screen, and the top of the negative pressure tube is provided with a deblocking hole extending along its axial direction and arranged toward the main screen. The negative pressure tube is used to connect to a negative pressure generating unit to absorb the material blocked on the main screen with the help of the deblocking hole.

[0023] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0024] The bottom of the main screen is provided with a vibration plate arranged along its length direction, the bottom of the vibration plate has a plurality of vibration protrusions, and the top of the slider has an actuating protrusion;

[0025] The actuating protrusion is configured to impact the plurality of vibrating protrusions in sequence when driven by the sliding movement of the slider, so as to cause the main screen to vibrate.

[0026] For example, at least one embodiment of the present invention provides a screening device for metal additive production, further comprising:

[0027] The negative pressure pipe is rotatably mounted on the slider, a gear is coaxially mounted on the end of the negative pressure pipe, a rack is mounted on the tail end of the support rail, and a collecting hole is formed on the bottom wall of the screen box;

[0028] The gear is configured to be able to mesh with the rack and drive the negative pressure tube to rotate under the drive of the slider, so that the unblocking hole is synchronously rotated to the collecting hole facing downward to unload the material into the collecting hole.

[0029] The beneficial effects of the embodiments of the present invention are:

[0030] In the present invention, when screening is performed, the material is first poured onto the center of the pre-cloth screen. As the height of the pre-cloth screen gradually decreases from the center to the sides, and driven by the vibration of the main screen, the material is affected by gravity and the inertial force generated by the vibration, and is dispersed to the sides along the surface of the pre-cloth screen. During this dispersion process, the material falls through the mesh holes of the pre-cloth screen, thereby being evenly distributed on the surface of the main screen. The main screen then begins to screen the fallen material. Material that meets the particle size requirements passes through the mesh holes of the main screen and is discharged through the corresponding discharge port. Material that does not meet the requirements remains on the surface of the main screen and is ultimately discharged through the corresponding discharge port.

[0031] The height design of the cloth pre-screen allows the material to be evenly spread from the centralized dumping point to both sides and evenly distributed on the main screen, avoiding the problem of excessive material accumulation in some areas of the main screen and scarce material in some areas, and fully utilizing the entire screening area of the main screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0033] Figure 1 This is a schematic structural diagram of a screening device for producing metal additives according to an embodiment of the present invention;

[0034] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0035] Figure 3 for Figure 1 A schematic structural diagram of a mounting frame in an embodiment of the present invention;

[0036] Figure 4 for Figure 1 A schematic structural diagram of a cloth vertical plate in an embodiment of the present invention;

[0037] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0038] Figure 6 for Figure 1 Schematic diagram of the internal structure of the screen box in the embodiment;

[0039] Figure 7 for Figure 1A schematic structural diagram of the bottom of the main screen in the embodiment;

[0040] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0041] Figure 9 for Figure 7 Enlarged view of point D in the middle;

[0042] Figure 10 for Figure 1 A schematic structural diagram of a blockage relief assembly in an embodiment of the present invention;

[0043] Figure 11 for Figure 10 Enlarged view of point E in the middle;

[0044] Figure 12 for Figure 1 Schematic diagram of the structure of the vibration mechanism in the embodiment.

[0045] In the figure: 1. screen box, 2. main screen, 3. cloth pre-screen, 4. mounting frame, 5. pressure plate, 6. adjusting nut, 7. adjusting screw, 8. support rib, 9. feed hopper, 201. receiving plate, 202. screening plate, 10. cloth vertical plate, 1001. cloth hole, 11. vibration mechanism, 1101. rocker arm, 1102. knocking rod, 1103. vibration motor, 12. guide wheel, 13. guide plate, 14. deblocking component, 1401. support rail, 1402. slider, 1403. negative pressure tube, 1404. deblocking hole, 15. vibration plate, 1501. vibration protrusion, 1405. actuating protrusion, 16. gear, 17. rack, 101. collecting hole. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0047] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0048] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0049] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0050] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0051] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] like Figures 1 to 12 As shown, it shows a screening device for metal additive production in one embodiment of the present invention. In order to solve the problem that uneven material distribution in traditional screening devices affects the screening effect, the screening device for metal additive production provided in this embodiment includes a screen box 1, a main screen 2 and a cloth pre-screen 3.

[0053] The screen box 1 is the main frame of the entire device, which plays the role of supporting and accommodating other components. The bottom and four sides of the screen box 1 are closed, and the top opening is used to install the main screen 2. Two discharge ports are set on the side, located on the upper and lower sides of the main screen 2, so as to collect the two types of particle sizes of materials after screening. The main screen 2 is installed in the screen box 1, and receives the material falling from the cloth pre-screen 3 and screens it. The material with qualified particle size falls through the sieve holes of the main screen 2, while the material that does not meet the particle size requirements remains on the main screen 2. The cloth pre-screen 3 is located above the feeding end of the main screen 2. Its function is to preliminarily disperse and pre-screen the material before it enters the main screen 2.

[0054] During screening, the material is first poured onto the center of the pre-screen 3. As the height of the pre-screen 3 gradually decreases from the center toward the sides, and driven by the vibration of the main screen 2, the material is affected by gravity and the inertial force generated by the vibration, spreading outward along the surface of the pre-screen 3. During this spreading process, the material falls through the meshes of the pre-screen 3, becoming evenly distributed across the surface of the main screen 2. The main screen 2 then begins screening the falling material. Material that meets the required particle size passes through the meshes of the main screen 2 and is discharged through the corresponding discharge port. Material that does not meet the required particle size remains on the surface of the main screen 2 and is ultimately discharged through the corresponding discharge port.

[0055] The height design of the cloth pre-screen 3 allows the material to be evenly spread out from the centralized pouring point to both sides and evenly distributed on the main screen 2, avoiding the problem of excessive material accumulation in some areas of the main screen 2 and scarce material in some areas, and fully utilizing the entire screening area of the main screen 2.

[0056] In some examples, such as Figures 1 to 3 As shown, in this embodiment, the pre-screen 3 for fabric distribution is designed to be curved. This curved shape can better guide the material to disperse from the center to the sides, making the material more evenly dispersed and further improving the distribution effect. The mounting bracket 4 provided at the feeding end of the main screen 2 is also curved, matching the shape of the pre-screen 3 for fabric distribution. The pre-screen 3 and mounting bracket 4 are both arranged along the width of the main screen 2. The mounting bracket 4 is equipped with multiple movable pressure plates 5, which can press the pre-screen 3 against the mounting bracket 4 to prevent loosening or partial lifting.

[0057] When installing the fabric pre-screen 3, place it on the mounting bracket 4, ensuring that the two are in contact. Then, move the pressure plate 5 on the mounting bracket 4, bringing it close to the fabric pre-screen 3 until it is firmly pressed against the mounting bracket 4. Bolts can be threaded onto the mounting bracket 4, and the pressure plate 5 is connected to the end of the bolt. The movement of the pressure plate 5 can be controlled by rotating the bolt. If the fabric pre-screen 3 becomes worn, clogged, or damaged due to long-term use, simply move the pressure plate 5 in the opposite direction to separate it from the fabric pre-screen 3. The old fabric pre-screen 3 can then be removed and replaced with a new one.

[0058] In actual production, the cloth pre-screen 3 is the component that directly bears the impact of material dumping and is easily affected by problems such as material wear and sieve hole clogging. The detachable design facilitates the quick replacement of the cloth pre-screen 3, shortening the maintenance time of the equipment.

[0059] In some examples, such as Figures 1 to 3 As shown, adjustment nuts 6 are rotatably mounted at both ends of the mounting bracket 4. Adjustment screw 7 has threads with opposite rotation directions and the same pitch at both ends. This allows the adjustment nuts 6 at both ends of the mounting bracket 4 to simultaneously move in opposite directions when the adjustment screw 7 is rotated. A polygonal structure is designed in the middle of the adjustment screw 7 to facilitate operator force application, making manual rotation of the adjustment screw 7 easier.

[0060] Mounting frame 4 is made of a deformable, elastic metal, allowing it to elastically deform when subjected to external forces. When the adjustment screw 7 drives the adjustment nut 6 toward or away from the mounting frame 4, forces are applied to both ends of the mounting frame 4, causing the overall curvature of the mounting frame 4 to change. When working with different types of metal additives, the operator can change the shape of the mounting frame 4 by rotating the adjustment screw 7. If the material has good fluidity, the curvature of the mounting frame 4 can be reduced by rotating the adjustment screw 7. If the material has poor fluidity, the curvature of the mounting frame 4 can be appropriately increased, using gravity to enhance the dispersion of the material to the sides.

[0061] By adjusting the arch shape of the mounting frame 4, the speed at which the material spreads on the cloth pre-screen 3 is controlled, thereby adapting to metal additives with different fluidities, expanding the scope of application of the equipment, and allowing different materials to be evenly distributed on the main screen 2.

[0062] In some examples, such as Figure 3As shown, the mounting frame 4 is provided with a plurality of support ribs 8. The support ribs 8 are arranged along the width direction of the cloth pre-screen 3. The plurality of support ribs 8 are spaced along the arc-shaped extension direction of the cloth pre-screen 3, which can support the cloth pre-screen 3 and enhance the structural strength. The mounting frame 4 is also provided with a vertically extending feed hopper 9. The feed hopper 9 is generally in the shape of a frustum. The top opening of the feed hopper 9 is relatively large to facilitate the pouring of materials. The bottom opening is relatively small and is located directly above the middle of the cloth pre-screen 3 to ensure that the materials can fall into the middle of the cloth pre-screen 3.

[0063] During the metal additive screening process, when material is dumped onto the pre-screen 3, it exerts a certain amount of impact force on the pre-screen 3. If the pre-screen 3 is not strong enough, it may deform after prolonged use, shortening its service life. Multiple evenly distributed support ribs 8 can disperse the impact force generated by the material dumping onto the mounting frame 4, thereby enhancing the strength of the pre-screen 3.

[0064] In some examples, such as Figure 1 、 2 As shown in Figures 4 and 5, the main screen 2 includes a receiving plate 201 without screen holes and a screening plate 202 with screen holes. The material distribution plate 10 is movably arranged adjacent to the receiving plate 201 and the screening plate 202 and is perpendicular to the surface of the main screen 2. A plurality of material distribution holes 1001 are distributed on the material distribution plate 10.

[0065] After the material passes through the pre-screen 3 for initial dispersion, it falls onto the receiving plate 201 below and is blocked by the vertical distribution plate 10. Since the vertical distribution plate 10 can move back and forth, the lateral position of the distribution holes 1001 constantly changes with the movement of the vertical distribution plate 10, causing the material to fall onto the screening plate 202 in a wave-like shape, thereby increasing the uniformity of the material distribution on the screening plate 202.

[0066] In some examples, such as Figure 7 As shown, the conventional method of vibrating the screen and the screen box 1 together has the problems of high noise and shortening the life of the equipment. In this embodiment, the main screen 2 is vibrated separately.

[0067] The middle portion of the swing arm 1101 is hingedly fixed to the side wall of the screen box 1. The middle portion of the knocking rod 1102 is located at the top of the swing arm 1101, forming a swinging structure with the swing arm 1101. The ends of the knocking rod 1102 are shaped like smooth hammers to better contact the bottom surface of the main screen 2. During the swing of the swing arm 1101, the two ends of the knocking rod 1102 alternately strike the bottom surface of the main screen 2, thereby causing the main screen 2 to vibrate uniformly. A vibration motor 1103 is mounted at the bottom end of the swing arm 1101 to swing the swing arm 1101, which in turn drives the knocking rod 1102 to swing. The main screen 2 is vibrated within the screen box 1 by an elastic support structure (which can be a spring, rubber pad, or other elastic element). For example, a spring is installed on the inner wall of the screen box 1, with one end fixed to the inner wall of the screen box 1 and the other end connected to the frame of the main screen 2. This allows the main screen 2 to vibrate vertically without the screen box 1 vibrating with it.

[0068] When vibration motor 1103 is activated, its internal eccentric mass rotates, generating centrifugal force that acts on the bottom end of pendulum rod 1101, causing it to swing back and forth about its central hinge point. As pendulum rod 1101 swings, the tapping rod 1102 at its top also swings, causing its two ends to alternately strike the bottom surface of main screen 2. Each tapping imparts a momentary impact force to main screen 2, which, in conjunction with the elastic support structure, vibrates up and down, achieving independent vibration of main screen 2.

[0069] When the traditional screen and screen box 1 vibrate together, the vibration of the screen box 1 generates a lot of noise. However, in this embodiment, the screen box 1 does not vibrate along with the main screen 2. Only the main screen 2 vibrates under the action of the knocking rod 1102, which reduces the noise source generated by the vibration being transmitted to the screen box 1. Since the screen box 1 does not participate in the vibration, fatigue damage to the screen box 1 structure caused by long-term vibration is avoided, and the possibility of cracks and deformation in the screen box 1 is reduced, thereby extending the service life of the screen box 1.

[0070] In some examples, such as Figure 1 、 2 As shown in Figures 4 and 5, this embodiment realizes the linkage between the vibration of the main screen 2 and the reciprocating movement of the cloth vertical plate 10 through ingenious structural design.

[0071] At both ends of the material distribution plate 10, there are guide wheels 12 that rotate. On the inner walls of both sides of the screen box 1, corresponding to the positions of the guide wheels 12, there are guide plates 13. There is an angle between the guide plates 13 and the vibration direction of the main screen 2.

[0072] When the main screen 2 vibrates up and down under the action of the vibration mechanism 11, the cloth plate 10 connected to the main screen 2 will also produce synchronous up and down movement. Because the guide wheels 12 at both ends of the cloth plate 10 are respectively in contact with the guide plates 13 on both sides, and there is an angle between the guide plates 13 and the vibration direction of the main screen 2. In the process of the guide wheel 12 rolling on the guide plate 13, it will also produce lateral movement due to the inclination angle of the guide plate 13. As the main screen 2 continues to vibrate up and down, the guide wheel 12 continues to roll on the guide plate 13, and the cloth plate 10 moves back and forth in the horizontal direction, thereby realizing the linkage between the vibration of the main screen 2 and the reciprocating movement of the cloth plate 10.

[0073] The lateral movement of the distribution plate 10 allows for more complete dispersion of the material, preventing localized accumulation of material, thereby improving screening efficiency and quality. By utilizing the vibration of the main screen 2 to drive the distribution plate 10, there is no need for a dedicated drive mechanism to control the reciprocating motion of the distribution plate 10.

[0074] In some examples, such as Figures 7 to 11 As shown, in order to solve the problem of clogging of the mesh of the main screen 2, this embodiment is designed with a declogging component 14 to clean the main screen 2. A support rail 1401 is set on the inner wall of the screen box 1. The support rail 1401 extends along the length of the main screen 2 and provides a sliding track for the slider 1402. A negative pressure tube 1403 is installed on the slider 1402. The top surface of the negative pressure tube 1403 is provided with a declogging hole 1404 along its own length. The top surface of the negative pressure tube 1403 faces the bottom surface of the main screen 2 to ensure that under the action of negative pressure, the declogging hole 1404 can suck out the clogged material. The negative pressure tube 1403 is connected to an external negative pressure generating unit through a hose. The negative pressure generating unit can be a vacuum pump or other equipment to provide adsorption force for the declogging hole 1404. A vibration plate 15 is set along the length of the bottom surface of the main screen 2. A plurality of vibration protrusions 1501 are distributed on the bottom surface of the vibration plate 15. An actuating protrusion 1405 is provided on the top of the slider 1402. During the movement of the slider 1402, the actuating protrusion 1405 can sequentially impact the multiple vibrating protrusions 1501 on the vibrating plate 15. The negative pressure tube 1403 is rotatably mounted on the slider 1402, and a gear 16 is coaxially fixed to the end of the negative pressure tube 1403. A rack 17 is provided at the rear end of the support rail 1401, and the rack 17 matches the gear 16. When the slider 1402 drives the negative pressure tube 1403 to move to the rear end of the support rail 1401, the gear 16 can engage with the rack 17. A collecting hole 101 is provided on the bottom wall of the screen box 1. The collecting hole 101 is normally closed and is opened only during blockage removal operations.

[0075] When the mesh of main screen 2 becomes clogged, the drive mechanism is activated to move slider 1402 along support rail 1401. A screw can be rotatably mounted inside screen box 1, with slider 1402 threadedly connected to the screw. A motor mounted outside screen box 1 drives the screw to rotate, thereby driving slider 1402 to move. Simultaneously, the negative pressure generating unit is activated, generating negative pressure within negative pressure pipe 1403 and creating an adsorption force at unblocking holes 1404. As slider 1402 moves, unblocking holes 1404 move along the length of main screen 2, sequentially adsorbing and cleaning the meshes of main screen 2, drawing any clogged material into negative pressure pipe 1403.

[0076] As slider 1402 moves, actuating protrusions 1405 on slider 1402 sequentially strike vibrating protrusions 1501 on vibrating plate 15. Each strike causes vibrating plate 15 to vibrate, which is then transmitted to main screen 2. The vibration of main screen 2 helps disperse material clogged in the sieve holes, making it more easily absorbed by unclogging holes 1404 and improving cleaning efficiency.

[0077] When negative pressure tube 1403 moves to the rear end of support rail 1401, gear 16 meshes with rack 17. Since rack 17 is fixed, gear 16, driven by rack 17, rotates negative pressure tube 1403, causing declogging hole 1404 to rotate downward toward collection hole 101. At this point, collection hole 101 is open, and material adsorbed within negative pressure tube 1403 falls through declogging hole 1404 under the influence of gravity into collection hole 101 for collection. Once collection is complete, collection hole 101 closes, and slider 1402 reverses direction, preparing for the next declogging operation.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A screening device for metal additive production, characterized in that: The invention comprises a screen box (1), a main screen (2) and a cloth pre-screen (3), wherein the main screen (2) is arranged in the screen box (1) for screening materials, and the cloth pre-screen (3) is arranged above the feeding end of the main screen (2). The mesh size of the cloth pre-screen (3) is larger than the mesh size of the main screen (2). The height of the cloth pre-screen (3) gradually decreases from the middle to the two ends. The middle of the cloth pre-screen (3) is used to receive materials. The cloth pre-screen (3) can guide the materials to spread from the middle to the two ends and be sieved onto the main screen (2); The material distribution pre-screen (3) is arranged along the width direction of the main screen (2), and the main screen (2) includes a receiving plate (201) for receiving the material screened by the material distribution pre-screen (3) and a screening plate (202) connected to the receiving plate (201). A material distribution vertical plate (10) is provided adjacent to the receiving plate (201) and the screening plate (202) so as to move along the width direction of the main screen (2). The material distribution vertical plate (10) has a plurality of material distribution holes (1001). The material distribution vertical plate (10) is configured to be able to reciprocate along the width direction of the main screen (2) so as to disperse the material onto the screening plate (202) by means of the material distribution holes (1001); A guide wheel (12) is rotatably provided on the side of the material distribution plate (10). Two guide wheels (12) are provided and are respectively provided near the two ends of the material distribution plate (10). Guide plates (13) are provided on the inner walls of both sides of the screen box (1). The guide plate (13) on one side extends in an arc shape above the central axis side of the main screen (2), and the guide plate (13) on the other side extends in an arc shape below the central axis side of the main screen (2). The two guide wheels (12) are respectively in contact with the two guide plates (13). The guide wheel (12) is configured to be able to roll on the guide plate (13) driven by the main screen (2) so as to cause the cloth vertical plate (10) to reciprocate along the width direction of the main screen (2).

2. A screening device for metal additive production according to claim 1, characterized in that: A mounting frame (4) is provided at the feeding end of the main screen (2), and the mounting frame (4) is arc-shaped. The mounting frame (4) is used to mount the cloth pre-screen (3) so that the cloth pre-screen (3) extends in an arc shape from the middle to both ends. A plurality of pressing plates (5) are movably provided on the mounting frame (4), and the pressing plates (5) are used to press and fix the cloth pre-screen (3) on the mounting frame (4).

3. A screening device for metal additive production according to claim 2, characterized in that: Both ends of the mounting frame (4) are rotatably provided with adjustment nuts (6), and an adjustment screw (7) is passed through the two adjustment nuts (6). The two ends of the adjustment screw (7) have threads with opposite rotation directions. The two ends of the adjustment screw (7) are respectively threadedly connected to the two adjustment nuts (6). The adjustment screw (7) can drive the two adjustment nuts (6) to move closer or farther away to adjust the arch curvature of the mounting frame (4).

4. A screening device for metal additive production according to claim 2, characterized in that: The mounting frame (4) is provided with a plurality of support ribs (8), and the support ribs (8) are used to support the bottom surface of the cloth pre-screen (3). The mounting frame (4) is also provided with a feed hopper (9), and the feed hopper (9) is used to guide the material to the middle of the cloth pre-screen (3).

5. A screening device for metal additive production according to claim 4, characterized in that: The vibrating mechanism (11) further comprises a swing rod (1101), a knocking rod (1102) and a vibration motor (1103), wherein the middle portion of the swing rod (1101) is hinged to the side wall of the screen box (1), the vibration motor (1103) is mounted at the bottom end of the swing rod (1101), and the middle portion of the knocking rod (1102) is arranged at the top end of the swing rod (1101). The swing rod (1101) is configured to be able to swing back and forth under the drive of the vibration motor (1103), and to alternately knock the bottom surface of the main screen (2) with the help of the two ends of the knocking rod (1102) to vibrate the main screen (2).

6. A screening device for metal additive production according to claim 1, characterized in that: The invention also includes a declogging assembly (14) located below the main screen (2), the declogging assembly (14) including a support rail (1401) arranged on the inner wall of the screen box (1), a slider (1402) slidably arranged on the support rail (1401), and a negative pressure tube (1403) arranged on the slider (1402), wherein the support rail (1401) extends along the length direction of the main screen (2), and the top of the negative pressure tube (1403) is provided with a declogging hole (1404) extending along its axial direction and arranged toward the main screen (2), and the negative pressure tube (1403) is used to connect to a negative pressure generating unit to absorb the material blocked on the main screen (2) with the help of the declogging hole (1404).

7. A screening device for metal additive production according to claim 6, characterized in that: The bottom of the main screen (2) is provided with a vibration plate (15) arranged along its length direction, the bottom of the vibration plate (15) has a plurality of vibration protrusions (1501), and the top of the slider (1402) has an actuation protrusion (1405). The actuating protrusion (1405) is configured to be able to sequentially impact the plurality of vibrating protrusions (1501) under the sliding drive of the slider (1402), so as to cause the main screen (2) to vibrate.

8. A screening device for metal additive production according to claim 7, characterized in that: The negative pressure tube (1403) is rotatably mounted on the slider (1402), a gear (16) is coaxially mounted on the end of the negative pressure tube (1403), a rack (17) is mounted on the tail end of the support rail (1401), and a collecting hole (101) is formed on the bottom wall of the screen box (1). The gear (16) is configured to be able to mesh with the rack (17) and drive the negative pressure tube (1403) to rotate under the drive of the slider (1402), so that the unblocking hole (1404) is synchronously rotated to the collecting hole (101) facing downward, so as to discharge the material into the collecting hole (101).

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