Screening device for metal additive production

Abstract

The invention relates to the technical field of metal additive screening, and provides a screening device for metal additive production, the screening device comprises a screening box, a main screen mesh and a material distribution pre-screening mesh, the main screen mesh is arranged in the screening box and used for screening materials, the material distribution pre-screening mesh is arranged above the feeding end of the main screen mesh, and the mesh size of the material distribution pre-screening mesh is larger than that of the main screen mesh; the height of the material distribution pre-screen is gradually reduced from the middle to the two sides, and the material distribution pre-screen can receive materials through the middle, so that the materials are scattered towards the two sides and then screened out to fall onto the main screen. By means of the technical scheme, the technical problems that in the prior art, the dumping positions of materials are concentrated, and the materials are not prone to being evenly spread on the screen are solved.

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 a substance that can effectively improve the performance of metal materials, are widely used in many fields such as metallurgy and machinery manufacturing. In the steel smelting process, by adding an appropriate amount of additives, the strength, toughness, corrosion resistance and other properties of steel can be significantly improved to meet the diverse requirements of steel performance in different engineering scenarios.

[0003] At present, in the metal additive production industry, traditional screening devices are still widely used. This type of screening device usually adopts the method of pouring raw materials on one end of the screen to load. However, due to the relatively concentrated pouring position, it is difficult for the material to be evenly spread on the screen. This results in excessive accumulation of materials in some areas of the screen, while scarce materials in some areas, resulting in the screen cannot be fully and effectively utilized. The materials in the accumulated areas are difficult to be fully screened, and the scarce areas may be over-screened, making the product particle size not meet the standard and affecting the screening effect.

[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] In order 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 pre-screen for distribution, wherein the main screen is arranged in the screen box for screening materials, and the pre-screen for distribution is arranged above the upper end of the main screen, the mesh size of the pre-screen for distribution is larger than the mesh size of the main screen, the height of the pre-screen for distribution gradually decreases from the middle to both ends, the middle part of the pre-screen for distribution is used for receiving materials, and the pre-screen for distribution can guide the materials to spread from the middle to both ends and be screened onto the main screen.

[0007] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: A mounting frame is provided at the feeding end of the main screen, and the mounting frame 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 and fix the cloth pre-screen on the mounting frame.

[0008] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: Adjustment nuts are rotatably provided at both ends of the mounting frame, and adjustment screws are passed through the two adjustment nuts. The two ends of the adjustment screws have threads with opposite rotation directions. The two ends of the adjustment screws are respectively threadedly connected to the two adjustment nuts. The adjustment screws can drive the two adjustment nuts to move closer or farther away to adjust the arch curvature of the mounting frame.

[0009] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: 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 part of the cloth pre-screen.

[0010] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: The material distribution 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 distribution pre-screen and a screening plate connected to the receiving plate, and a material distribution vertical plate is provided adjacent to the receiving plate and the screening plate for movement along the width direction of the main screen, and the material distribution vertical plate has a plurality of material distribution holes, and the material distribution 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 distribution holes.

[0011] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: A vibration mechanism, wherein the vibration mechanism comprises a swing rod, a knock rod and a vibration motor, wherein the middle portion of the swing rod is hinged to the side wall of the screen box, the vibration motor is mounted at the bottom end of the swing rod, and the middle portion of the knock rod is disposed at the top end of the swing rod; The swing rod is configured to swing back and forth under the drive of the vibration motor, and to 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.

[0012] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: A guide wheel is rotatably arranged 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 arranged on the inner walls of both sides of the screen box, and 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, and the two guide wheels are respectively abutted on the two guide plates; 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.

[0013] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: A blockage-removing component is located below the main screen, and the blockage-removing component includes a support rail arranged on the inner side wall of the screen box, a slider slidably arranged 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 blockage-removing 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 blockage-removing hole.

[0014] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: 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; The actuating protrusion is configured to impact the plurality of vibrating protrusions in sequence under the sliding movement of the slider, so as to vibrate the main screen.

[0015] For example, at least one embodiment of the present invention provides a screening device for metal additive production, which further includes: The negative pressure pipe is rotatably arranged on the slider, a gear is coaxially arranged at the end of the negative pressure pipe, a rack is arranged at the tail end of the support rail, and a collecting hole is opened on the bottom wall of the screen box; The gear is configured to mesh with the rack and drive the negative pressure tube to rotate under the drive of the slider, so that the unblocking hole can be synchronously rotated to the collecting hole facing downward to discharge the material into the collecting hole.

[0016] The beneficial effects of the embodiments of the present invention are: In the present invention, when the screening work is performed, the material is first poured into the middle of the cloth pre-screen. As the height of the cloth pre-screen gradually decreases from the middle to both sides, and driven by the vibration of the main screen, the material will be affected by the gravity and the inertial force generated by the vibration, and will spread to both sides along the surface of the cloth pre-screen. During the spreading process, the material will fall through the sieve holes of the cloth pre-screen, and thus be evenly distributed on the surface of the main screen. Then, the main screen begins to screen the fallen material, and the material that meets the particle size requirements passes through the sieve holes of the main screen and is discharged through the corresponding discharge port, while the material that does not meet the requirements remains on the surface of the main screen and is finally discharged through the corresponding discharge port.

[0017] 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

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some exemplary embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on the contents of the exemplary embodiments of the present invention and these drawings without creative work.

[0019] Figure 1 This is a schematic structural diagram of a screening device for producing metal additives in one embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 A schematic diagram of the structure of the mounting frame in the embodiment of FIG. Figure 4 for Figure 1 A schematic diagram of the structure of the cloth vertical plate in the embodiment of the invention; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 for Figure 1 Schematic diagram of the internal structure of the screen box in the embodiment; Figure 7 for Figure 1 A schematic structural diagram of the bottom of the main screen in the embodiment; Figure 8 for Figure 7 Enlarged view of point C in the middle; Fig. 9 for Figure 7 Enlarged view of point D in the middle; Fig.10 for Figure 1 A schematic diagram of the structure of the blockage relief assembly in the embodiment; Fig.11 for Fig.10 Enlarged view of point E in the middle; Fig.12 for Figure 1 Schematic diagram of the structure of the vibration mechanism in the embodiment.

[0020] 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. supporting 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. unblocking component, 1401. support rail, 1402. slider, 1403. negative pressure tube, 1404. unblocking hole, 15. vibration plate, 1501. vibration protrusion, 1405. actuating protrusion, 16. gear, 17. rack, 101. collecting hole. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with 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.

[0022] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0023] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] 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.

[0027] like Figure 1 to Figure 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.

[0028] The screen box 1 is the main frame of the entire device, which supports and accommodates other components. The bottom and 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, which are located on the upper and lower sides of the main screen 2, so as to collect the two particle sizes of materials after screening. The main screen 2 is installed in the screen box 1, receiving the materials falling from the cloth pre-screen 3 and screening them. The materials with qualified particle sizes fall through the sieve holes of the main screen 2, while the materials that do not meet the particle size requirements remain 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 materials before they enter the main screen 2.

[0029] When screening, first pour the material into the middle of the cloth pre-screen 3. As the height of the cloth pre-screen 3 gradually decreases from the middle to both sides, and driven by the vibration of the main screen 2, the material will be affected by gravity and the inertial force generated by the vibration, and spread to both sides along the surface of the cloth pre-screen 3. During the spreading process, the material will fall through the sieve holes of the cloth pre-screen 3, and thus be evenly distributed on the surface of the main screen 2. Then, the main screen 2 begins to screen the fallen material, and the material that meets the particle size requirements passes through the sieve holes of the main screen 2 and is discharged through the corresponding discharge port, while the material that does not meet the requirements remains on the surface of the main screen 2 and is eventually discharged through the corresponding discharge port.

[0030] The height design of the cloth pre-screen 3 allows the material to be evenly dispersed 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.

[0031] In some examples, such as Figure 1~Figure 3 As shown, in this embodiment, the cloth pre-screen 3 is designed to be arc-shaped. The arc-shaped cloth pre-screen 3 can better guide the material to spread from the middle to both sides, so that the material is more uniform during the spreading process, further improving the cloth effect. The mounting frame 4 set at the feeding end of the main screen 2 is also arc-shaped, matching the shape of the cloth pre-screen 3. The cloth pre-screen 3 and the mounting frame 4 are both set along the width direction of the main screen 2. A plurality of movable pressing plates 5 are set on the mounting frame 4. The pressing plates 5 can press the cloth pre-screen 3 to the mounting frame 4 to prevent loosening or partial warping.

[0032] When installing the cloth pre-screen 3, place the cloth pre-screen 3 on the mounting frame 4 to ensure that the two fit together. Then, move the pressing plate 5 on the mounting frame 4 so that the pressing plate 5 is close to the cloth pre-screen 3 until the cloth pre-screen 3 is pressed tightly against the mounting frame 4. Bolts can be threadedly installed on the mounting frame 4, and the pressing plate 5 can be connected to the end of the bolt, so that the movement of the pressing plate 5 can be controlled by rotating the bolt. When the cloth pre-screen 3 is worn, the mesh is clogged or damaged due to long-term use, the pressing plate 5 can be moved in the opposite direction to separate it from the cloth pre-screen 3, and the old cloth pre-screen 3 can be removed and replaced with a new one.

[0033] In actual production, the cloth pre-screen 3 is the component that directly bears the impact force when the material is dumped, and is easily affected by the wear of the material and the clogging of the screen holes. The detachable design facilitates the quick replacement of the cloth pre-screen 3, shortening the maintenance time of the equipment.

[0034] In some examples, such as Figure 1~Figure 3As shown, an adjusting nut 6 is rotatably provided at both ends of the mounting frame 4. The two ends of the adjusting screw 7 have threads with opposite rotation directions and the same pitch. This is to simultaneously drive the adjusting nuts 6 at both ends of the mounting frame 4 to move in opposite directions or in opposite directions when the adjusting screw 7 is rotated. The middle part of the adjusting screw 7 is designed with a polygonal structure that is convenient for the operator to apply force, so that the adjusting screw 7 can be rotated manually.

[0035] The mounting frame 4 is made of elastic metal that can be deformed, so that the mounting frame 4 can be elastically deformed when subjected to external force. When the adjusting screw 7 drives the adjusting nut 6 to move closer or farther away, the two ends of the mounting frame 4 are subjected to force, so that the overall arch of the mounting frame 4 changes. When faced with different types of metal additives, the operator can change the shape of the mounting frame 4 by rotating the adjusting screw 7. If the material has good fluidity, the arch of the mounting frame 4 can be slowed down by rotating the adjusting screw 7. If the material has poor fluidity, the arch of the mounting frame 4 can be appropriately increased, and gravity can be used to enhance the dispersion of the material to both sides.

[0036] By adjusting the arch shape of the mounting frame 4, the speed at which the material is dispersed on the cloth pre-screen 3 is controlled, thereby adapting to metal additives with different fluidities, expanding the application range of the equipment, and allowing different materials to be evenly distributed on the main screen 2.

[0037] In some examples, such as Figure 3 As shown, a plurality of support ribs 8 are arranged on the mounting frame 4, and the support ribs 8 are arranged along the width direction of the cloth pre-screen 3. The plurality of support ribs 8 are arranged at intervals along the arc-shaped extension direction of the cloth pre-screen 3, and can support the cloth pre-screen 3 to improve the structural strength. A feed hopper 9 is also provided on the mounting frame 4, which is vertically penetrated. The feed hopper 9 is in a frustum shape as a whole. The top opening of the feed hopper 9 is relatively large, which is convenient for pouring 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 to the middle of the cloth pre-screen 3.

[0038] During the metal additive screening process, when the material is poured onto the cloth pre-screen 3, a certain impact force will be generated on the cloth pre-screen 3. If the cloth pre-screen 3 is not strong enough, it may be deformed after long-term use, which will affect its service life. Multiple evenly distributed support ribs 8 can disperse the impact force generated by the material pouring onto the mounting frame 4, thereby improving the strength of the cloth pre-screen 3.

[0039] In some examples, such as Figure 1 , 2 As shown in FIGS. 4 and 5 , the main screen 2 includes a receiving plate 201 without screen holes and a screening plate 202 with screen holes, and the material distribution plate 10 is movably arranged at a position 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.

[0040] After the material is initially dispersed by the material distribution pre-screen 3, it falls onto the receiving plate 201 below and is blocked by the material distribution vertical plate 10. Since the material distribution vertical plate 10 can move back and forth, the lateral position of the material distribution hole 1001 changes continuously with the movement of the material distribution vertical plate 10, so that the material is screened and falls onto the screening plate 202 in a wave-like shape, thereby increasing the uniformity of the material distribution on the screening plate 202.

[0041] 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. This embodiment realizes the main screen 2 to vibrate alone.

[0042] The middle part of the swing rod 1101 is fixed to the side wall of the screen box 1 by a hinged manner, and the middle part of the knocking rod 1102 is arranged at the top of the swing rod 1101, forming a swing structure with the swing rod 1101. The two ends of the knocking rod 1102 are in the shape of smooth hammer heads to better contact the bottom surface of the main screen 2. During the swinging process of the swing rod 1101, the two ends of the knocking rod 1102 can alternately knock the bottom surface of the main screen 2, so that the main screen 2 vibrates evenly. The vibration motor 1103 is installed at the bottom end of the swing rod 1101, which is used to drive the swing rod 1101 to swing, so that the swing rod 1101 drives the knocking rod 1102 to swing. The main screen 2 is vibrated and set in the screen box 1 through an elastic support structure (which can be an elastic element such as a spring, a rubber pad, etc.). For example, a spring is installed on the inner wall of the screen box 1, one end of the spring is fixed to the inner wall of the screen box 1, and the other end is connected to the frame of the main screen 2, so that the main screen 2 can vibrate in the vertical direction, and the screen box 1 will not vibrate with the main screen 2.

[0043] When the vibration motor 1103 is started, the eccentric block inside it rotates, and the centrifugal force generated by the eccentric block acts on the bottom end of the swing rod 1101, causing the swing rod 1101 to swing back and forth with the hinge point in the middle as the axis. As the swing rod 1101 swings, the knocking rod 1102 located at the top of the swing rod 1101 also swings accordingly, so that the two ends of the knocking rod 1102 alternately knock on the bottom surface of the main screen 2. Each knock will apply an instantaneous impact force to the main screen 2, and with the cooperation of the elastic support structure, the main screen 2 will vibrate up and down, realizing the independent vibration of the main screen 2.

[0044] When the traditional screen and the screen box 1 vibrate together, the vibration of the screen box 1 will generate a large noise. In this embodiment, the screen box 1 does not vibrate with the main screen 2, and only the main screen 2 vibrates under the action of the knocking rod 1102, which reduces the noise source generated by the vibration transmitted to the screen box 1. The screen box 1 does not participate in the vibration, avoiding fatigue damage to the structure of the screen box 1 caused by long-term vibration, reducing the possibility of cracks, deformation and other problems in the screen box 1, thereby extending the service life of the screen box 1.

[0045] 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 plate 10 through a clever structural design.

[0046] At both ends of the material distribution plate 10, guide wheels 12 are rotatably arranged. On the inner walls of both sides of the screen box 1, guide plates 13 are arranged at positions corresponding to the guide wheels 12. An angle is designed between the guide plates 13 and the vibration direction of the main screen 2.

[0047] 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 produce synchronous up and down movement. Because the guide wheels 12 at both ends of the cloth plate 10 are respectively abutted against the guide plates 13 on both sides, and there is an angle between the guide plate 13 and the vibration direction of the main screen 2. When the guide wheel 12 rolls 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 lateral direction, thereby realizing the linkage between the vibration of the main screen 2 and the reciprocating movement of the cloth plate 10.

[0048] The lateral movement of the material distribution plate 10 allows the material to be more fully dispersed, avoiding local accumulation of the material, thereby improving the efficiency and quality of screening. By utilizing the vibration of the main screen 2 to drive the material distribution plate 10 to move, there is no need to set up a special driving mechanism to control the reciprocating motion of the material distribution plate 10.

[0049] In some examples, such as Figure 7~Figure 11As shown, in order to solve the problem of clogging of the mesh of the main screen 2, the present embodiment designs a dredging assembly 14 to clean the main screen 2. A support rail 1401 is arranged on the inner wall of the screen box 1, and the support rail 1401 extends along the length direction of the main screen 2 to provide a sliding track for the slider 1402. A negative pressure tube 1403 is installed on the slider 1402, and a dredging hole 1404 is opened on the top surface of the negative pressure tube 1403 along its own length direction, and the top surface of the negative pressure tube 1403 faces the bottom surface of the main screen 2 to ensure that the dredging hole 1404 can suck out the blocked material under the action of negative pressure. The negative pressure tube 1403 is connected to an external negative pressure generating unit through a hose, and the negative pressure generating unit can be a vacuum pump or other equipment to provide adsorption force for the dredging hole 1404. A vibration plate 15 is arranged on the bottom surface of the main screen 2 along the length direction, and a plurality of vibration protrusions 1501 are distributed on the bottom surface of the vibration plate 15. An actuating protrusion 1405 is arranged on the top of the slider 1402. The actuating protrusion 1405 can sequentially impact the multiple vibration protrusions 1501 on the vibration plate 15 during the movement of the slider 1402. 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 arranged 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 mesh with the rack 17. A collecting hole 101 is provided on the bottom wall of the screen box 1. The collecting hole 101 is usually in a closed state and is only opened during the unblocking operation.

[0050] When the mesh of the main screen 2 is clogged, the driving device is started to move the slider 1402 along the support rail 1401. A screw can be rotatably arranged inside the screen box 1, and the slider 1402 is threadedly connected to the screw. The screw is driven to rotate by a motor installed outside the screen box 1, thereby driving the slider 1402 to move. At the same time, the negative pressure generating unit is turned on to generate negative pressure in the negative pressure pipe 1403, and an adsorption force is formed at the unblocking hole 1404. As the slider 1402 moves, the unblocking hole 1404 moves along the length direction of the main screen 2, and the meshes of each part of the main screen 2 are adsorbed and cleaned in turn, and the materials blocked in the meshes are sucked into the negative pressure pipe 1403.

[0051] During the movement of the slider 1402, the actuating protrusion 1405 on the slider 1402 hits the vibrating protrusion 1501 on the vibrating plate 15 in sequence. Each impact causes the vibrating plate 15 to vibrate and transmit the vibration to the main screen 2. The vibration of the main screen 2 helps to disperse the material blocked in the screen hole, making it easier for the material to be adsorbed by the unblocking hole 1404, thereby improving the cleaning effect.

[0052] When the negative pressure tube 1403 moves to the rear end of the support rail 1401, the gear 16 meshes with the rack 17. Since the rack 17 is fixed, the gear 16 drives the negative pressure tube 1403 to rotate under the action of the rack 17, so that the unblocking hole 1404 rotates to the collection hole 101 facing downward. At this time, the collection hole 101 is in an open state, and the material adsorbed in the negative pressure tube 1403 falls into the collection hole 101 through the unblocking hole 1404 under the action of gravity for collection. After the collection is completed, the collection hole 101 is closed, and the slider 1402 moves in the opposite direction to prepare for the next unblocking operation.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. 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 material pre-screen (3), wherein the main screen (2) is arranged in the screen box (1) and is used for screening materials, and the material pre-screen (3) is arranged above the feeding end of the main screen (2). The mesh size of the material pre-screen (3) is larger than the mesh size of the main screen (2). The height of the material pre-screen (3) gradually decreases from the middle to both ends. The middle part of the material pre-screen (3) is used for receiving materials, and the material pre-screen (3) can guide the materials to spread from the middle to both ends and be screened onto 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), the mounting frame (4) being arc-shaped, and being 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, and 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 the two adjustment nuts (6) are penetrated by adjustment screws (7), and the two ends of the adjustment screws (7) have threads with opposite rotation directions. The two ends of the adjustment screws (7) are respectively threadedly connected to the two adjustment nuts (6), and the adjustment screws (7) can drive the two adjustment nuts (6) to move closer or farther away, so as to adjust the arching 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), the support ribs (8) being used to support the bottom surface of the cloth pre-screen (3); the mounting frame (4) is also provided with a feed hopper (9), the feed hopper (9) being 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 1, characterized in that: The material distribution pre-screen (3) is arranged along the width direction of the main screen (2); the main screen (2) comprises a receiving plate (201) for receiving materials 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 arranged adjacent to the receiving plate (201) and movable 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 materials onto the screening plate (202) by means of the material distribution holes (1001).

6. A screening device for metal additive production according to claim 5, characterized in that: It also comprises a vibration mechanism (11), the vibration mechanism (11) comprising a swing rod (1101), a knock rod (1102) and a vibration motor (1103), the middle portion of the swing rod (1101) being hinged to the side wall of the screen box (1), the vibration motor (1103) being mounted at the bottom end of the swing rod (1101), and the middle portion of the knock rod (1102) being arranged at the top end of the swing rod (1101). The swing rod (1101) is configured 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 cause the main screen (2) to vibrate.

7. A screening device for metal additive production according to claim 6, characterized in that: A guide wheel (12) is rotatably provided on the side of the material distribution vertical plate (10), and two guide wheels (12) are provided and are respectively arranged near the two ends of the material distribution vertical plate (10). Guide plates (13) are provided on the inner walls of both sides of the screen box (1), and the guide plate (13) on one side extends in an arc shape upwardly toward the middle axis side of the main screen (2), and the guide plate (13) on the other side extends in an arc shape downwardly toward the middle axis side of the main screen (2). The two guide wheels (12) are respectively abutted against 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 material distribution plate (10) to reciprocate along the width direction of the main screen (2).

8. A screening device for metal additive production according to claim 1, characterized in that: The invention also comprises a declogging assembly (14) located below the main screen (2), the declogging assembly (14) comprising 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 pipe (1403) arranged on the slider (1402), the support rail (1401) extending along the length direction of the main screen (2), the top of the negative pressure pipe (1403) is provided with a declogging hole (1404) extending along its axial direction and arranged toward the main screen (2), and the negative pressure pipe (1403) is used to communicate with a negative pressure generating unit so as to absorb the material blocked on the main screen (2) with the help of the declogging hole (1404).

9. A screening device for metal additive production according to claim 8, 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 impact the plurality of vibration protrusions (1501) in sequence under the sliding movement of the sliding block (1402), so as to cause the main screen (2) to vibrate.

10. A screening device for metal additive production according to claim 9, 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 disposed at the rear 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 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) can be synchronously rotated to the collecting hole (101) facing downward, so as to discharge the material into the collecting hole (101).

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