CN115889178B - Building sand screening device and screening method - Google Patents
Building sand screening device and screening method Download PDFInfo
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- CN115889178B CN115889178B CN202310187625.2A CN202310187625A CN115889178B CN 115889178 B CN115889178 B CN 115889178B CN 202310187625 A CN202310187625 A CN 202310187625A CN 115889178 B CN115889178 B CN 115889178B
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Abstract
The invention belongs to the technical field of sand and gravel screening, in particular to a building sand and gravel screening device and a screening method, comprising a screening machine body, wherein one end of the screening machine body is provided with a plurality of blanking openings, a screen structure is arranged in the screening machine body, one side above the screen structure is provided with a feeding structure, a blanking plate is arranged below the screen structure, one end of the top of the blanking plate is rotationally connected with a limiting structure, the limiting structure is matched with the plurality of blanking openings, one end of the limiting structure is inserted into one side of the screening machine body, the end part of the limiting structure is connected with a speed changing structure in a meshed manner, and one end of the speed changing structure is matched with the screen structure; according to the limiting structure, the size of the sieve holes can be synchronously adjusted by the sieve structure while the position of the material outlet is adjusted, and materials are discharged from different discharging openings according to different diameter intervals under the condition that the good sieving performance of the sieve structure is maintained, so that the classification of the materials is realized, and the proportioning of the materials is convenient for staff.
Description
Technical Field
The invention belongs to the technical field of sand screening, and particularly relates to a building sand screening device and a screening method.
Background
In the construction industry, in order to ensure the quality of concrete, the proportion of the grain size of sand in the concrete raw materials needs to be strictly controlled, so as to ensure the production quality of the concrete;
chinese patent publication No. CN113333295a discloses a sand and stone screening device for building and a method for using the same, which implements screening of sand and stones with different particle diameters in sand and stones by controlling the width of a gap between rotating plates, so that the problem of blocking in the screening process is avoided to a certain extent, but the gap between rotating plates is a long straight line instead of a grid, and the screening performance of the sand and stones is not high, so that there is still room for improvement.
Therefore, it is necessary to invent a construction sand screening device and screening method to solve the above problems.
Disclosure of Invention
The invention provides a building sand screening device and a screening method aiming at the problems, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a building grit screening plant, includes the screening organism, a plurality of feed opening has been seted up to the one end of screening organism, the internally mounted of screening organism has the screen cloth structure, feed structure is installed to one side of screen cloth structure top, the flitch is installed to the below of screen cloth structure, the one end at flitch top rotates and is connected with limit structure, limit structure and a plurality of feed opening assorted, one end of limit structure alternates one side of screening organism, and its tip meshing is connected with variable speed structure, variable speed structure's one end and screen cloth structure assorted.
Preferably, the screen structure includes bottom mounting panel and top mounting panel, by interior outside fixedly connected with in proper order two interior slide, outer slide group and outer mounting panel between bottom mounting panel and the top mounting panel, the inboard sliding connection of interior slide has a plurality of scissors fork bars, and on two interior slide scissors fork bars correspond each other, a plurality of on the same interior slide two tops of scissors fork bar are articulated according to the order head and the tail in proper order, lie in the head end one top of scissors fork bar is rotated with the interior slide of correspondence and is connected, two that correspond rotate the grafting between the top of scissors fork bar has the longitudinal rod, a plurality of crossbars are installed to equidistant laminating of below of longitudinal rod, the mounting panel is installed at the end fixed connection of horizontal pole, the other end fixed connection of horizontal pole is outer mounting panel.
Preferably, the inner slide comprises a curve part, two ends of the curve part are fixedly connected with straight line parts, the shape of the outer slide group is matched with that of the inner slide, the outer slide group lacks the curve part relative to the inner slide, the lower part of the scissor rod is shorter than the upper part of the scissor rod, the bottom end of the scissor rod is in sliding connection with the outer slide group, the outer side of the outer slide group is fixedly connected with a cylinder group, and the cylinder group is arranged on an outer mounting plate.
Preferably, the middle part of the vertical rod on the shearing fork rod at the tail end is sleeved with a fixing strip, the top end of the fixing strip is fixedly connected with a movable screw rod, one end of the movable screw rod penetrates through the top end of the top mounting plate to extend to the outside, a cone nut is sleeved on the movable screw rod, the top end of the cone nut is rotationally connected with the top end of the inner wall of the top mounting plate, one side of the cone nut is connected with a bevel gear rod in a meshed manner, and one end of the bevel gear rod penetrates through the screen structure and one side of the screening machine body to extend to the outside.
Preferably, the feeding structure comprises a middle charging barrel, a platform-shaped groove is formed in the bottom end of the middle charging barrel, two sides of the screening rack are fixedly connected with two ends of the middle charging barrel respectively, the end part of one end of the middle charging barrel is rotationally sleeved with a blanking cover, the end part of the other end of the middle charging barrel is fixedly connected with a feeding hopper, one end of the feeding hopper is fixedly connected with a feeding motor, one end of the feeding motor is inserted into the feeding hopper, the end part of the feeding motor is fixedly connected with a packing auger rod, and one end of the packing auger rod extends into the blanking cover.
Preferably, the limit structure comprises two telescopic baffles, the bottoms of one ends of the telescopic baffles are respectively connected with two sides of the top end of the blanking plate in a rotating mode, the distance between the other ends of the telescopic baffles is matched with the length of the blanking opening, the top of the other ends of the telescopic baffles is rotationally connected with a limit plate, the top of the limit plate is fixedly connected with a limit block, the middle of the limit block is embedded with a screw rod, one end of the screw rod penetrates through one side of the screening machine body to extend to the outside, the other end of the screw rod penetrates through the other side of the screening machine body, and the end portion of the screw rod is fixedly connected with a limit motor.
Preferably, the speed change structure comprises two double-end wheels, a first chain transmission belt is sleeved between the two double-end wheels, one side of the double-end wheels is connected with a gear reducer in a meshed mode, one side of the gear reducer is connected with one end of a screw rod in a meshed mode, the other double-end wheel is sleeved with a second chain transmission belt, one end of a second chain transmission belt sleeve is sleeved with a thumb wheel speed changer and a multi-stage flywheel, and one side of the multi-stage flywheel is fixedly connected with one end of a bevel gear rod.
Preferably, the bottom fixedly connected with vibration spring group of screening organism, the bottom fixedly connected with screening frame of vibration spring group, fixed mounting has vibrating motor in the screening frame, vibrating motor's one end alternates screening frame, and its tip fixedly connected with eccentric block, the top butt screening organism's of eccentric block bottom.
The screening method of the building sand screening device comprises the following steps of:
s1: starting a vibration motor to drive an eccentric block to knock the bottom end of the screening machine body, so that the screening machine body vibrates on the vibration spring set;
s2: starting a feeding motor to drive a packing auger rod to rotate, then pouring materials from a feeding hopper, pushing the materials by the packing auger rod, enabling the materials to fall onto a screen structure from a table-shaped groove of a middle charging barrel according to the sizes of the materials, screening the materials by the screen structure, then falling into a blanking plate, and finally discharging the materials from one of blanking openings;
s3: starting a limit motor to drive a screw rod to rotate so as to drive a limit block and a limit plate to move, pulling the other ends of the two telescopic baffle plates when the limit plate moves, enabling the moving position of the telescopic baffle plates to be matched with that of the other blanking port, and driving a screen structure to operate through a speed change structure while the screw rod rotates, so that the screen structure enlarges the area of a screen hole formed by a longitudinal rod and a cross rod, and the material which is not screened originally continuously falls onto the blanking plate and is discharged through the other blanking port;
s4: when the screen mesh structure is needed, the position of the second chain transmission belt on the multi-stage flywheel can be adjusted through the thumb wheel speed changer, so that under the condition that the rotating speed of the screw rod is unchanged, the rotating speed of the bevel gear rod is changed, and then the distance of the fixed strip pulling the corresponding longitudinal rod is changed, and the section with the mesh area of the screen mesh structure changed is controlled.
The invention has the technical effects and advantages that:
according to the invention, the feeding structure can primarily classify the materials according to the size, so that the materials fall on the screen structure more uniformly, the screen structure is convenient to screen, the limiting structure is linked with the screen structure through the speed change structure, the screen structure can synchronously adjust the size of the screen holes while adjusting the position of the material outlet, and the materials are discharged from different discharging openings according to different diameter intervals under the condition of keeping good screening performance of the screen structure, so that the classification of the materials is realized, and the proportioning of the materials is convenient for staff;
the invention is provided with a speed change structure, and the position of the second chain transmission belt on the multi-stage flywheel can be adjusted through the thumb wheel speed changer when needed, so that the rotating speed of the bevel gear rod is changed under the condition that the rotating speed of the screw rod is unchanged, and the distance of the fixed strip pulling the corresponding longitudinal rod is changed, thereby controlling the interval of mesh area fluctuation of the screen structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic cross-sectional view of a screening body of the present invention;
FIG. 3 is a schematic diagram of a transmission construction of the present invention;
FIG. 4 is a schematic cross-sectional view of a feed structure of the present invention;
FIG. 5 is a schematic view of the screen construction of the present invention;
FIG. 6 is a schematic view of the position of the moving screw of the present invention;
fig. 7 is a schematic view of the structure of the scissor lever of the invention.
In the figure: 1. a screening machine body; 101. a feed opening; 2. a screen structure; 201. a bottom mounting plate; 202. a top mounting plate; 203. an inner slide plate; 204. an outer slide plate group; 205. an outer mounting plate; 206. a scissors fork rod; 207. a longitudinal bar; 208. a cross bar; 209. a cylinder group; 210. a fixing strip; 211. moving the screw; 212. a cone nut; 213. bevel gear bar; 3. a feed structure; 301. a middle charging barrel; 302. a mesa groove; 303. a blanking cover; 304. a feed hopper; 305. a feed motor; 306. a hank Long Gan; 4. a blanking plate; 5. a limit structure; 501. a telescopic baffle; 502. a limiting plate; 503. a limiting block; 504. a screw rod; 505. a limit motor; 6. a speed change structure; 601. a double-head wheel; 602. a first chain drive belt; 603. a gear reducer; 604. a second chain drive belt; 605. a thumb wheel transmission; 606. a multi-stage flywheel; 7. a vibrating spring set; 8. a screening frame; 9. a vibration motor; 10. and an eccentric block.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, based on the embodiments of the invention, which a person of ordinary skill in the art would obtain without inventive faculty, are within the scope of the invention;
in the description of the present invention, 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 orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The invention provides a building sand screening device as shown in figures 1 to 7, which comprises a screening machine body 1, wherein one end of the screening machine body 1 is provided with a plurality of blanking openings 101, a screen structure 2 is arranged in the screening machine body 1, a feeding structure 3 is arranged on one side above the screen structure 2, a blanking plate 4 is arranged below the screen structure 2, one end of the top of the blanking plate 4 is rotatably connected with a limiting structure 5, the limiting structure 5 is matched with the plurality of blanking openings 101, one end of the limiting structure 5 is inserted into one side of the screening machine body 1, the end part of the limiting structure is connected with a speed changing structure 6 in a meshed manner, and one end of the speed changing structure 6 is matched with the screen structure 2.
When the screening machine is used, materials enter the screening machine body 1 from the feeding structure 3, are screened by the screen structure 2 and then fall onto the blanking plate 4, and are discharged from the corresponding blanking openings 101 after being limited by the limiting structure 5, the feeding structure 3 can be used for primarily classifying the materials according to the size, so that the materials fall on the screen structure 2 more uniformly, the screening of the screen structure 2 is facilitated, the limiting structure 5 is linked with the screen structure 2 through the speed changing structure 6, the screen structure 2 can synchronously adjust the size of the screening holes while the limiting structure 5 is used for adjusting the position of a material outlet, and the materials are discharged from different blanking openings 101 according to different diameter intervals under the condition of keeping good screening performance of the screen structure 2, so that the classification of the materials is realized, and the proportioning of the materials is facilitated for workers.
Referring to fig. 2, 5, 6 and 7 of the specification, the screen structure 2 includes a bottom mounting plate 201 and a top mounting plate 202, two inner sliding plates 203, an outer sliding plate group 204 and an outer mounting plate 205 are sequentially and fixedly connected between the bottom mounting plate 201 and the top mounting plate 202 from inside to outside, a plurality of scissor rods 206 are slidingly connected to the inner side of the inner sliding plate 203, the scissor rods 206 on the two inner sliding plates 203 correspond to each other, two top ends of the plurality of scissor rods 206 on the same inner sliding plate 203 are sequentially hinged end to end in sequence, one top end of the scissor rod 206 at the head end is rotationally connected with the corresponding inner sliding plate 203, a longitudinal rod 207 is rotationally inserted between the top ends of the corresponding two scissor rods 206, a plurality of cross rods 208 are installed at equal intervals under the longitudinal rod 207, one end of each cross rod 208 is fixedly connected with the bottom mounting plate 201, the other end of each cross rod 208 is fixedly connected with the outer mounting plate 205, and the cross rods 208 are matched with the longitudinal rods 207 to form screen holes;
the inner slide plate 203 comprises a curve part, two ends of the curve part are fixedly connected with a straight line part, the shape of the outer slide plate group 204 is matched with that of the inner slide plate 203, the outer slide plate group 204 lacks the curve part relative to the inner slide plate 203, when the scissors fork 206 is arranged on the curve part, the distance between two top ends is enlarged, the shape is different from that of the straight line part, therefore, the outer slide plate group 204 does not comprise the curve part, the lower part of the scissors fork 206 is shorter than the upper part of the scissors fork 206, when the distance between the two top ends of the scissors fork 206 is enlarged, the two bottom ends of the scissors fork 206 are shorter, so that the scissors fork 206 cannot be blocked with the adjacent scissors fork 206, the bottom ends of the scissors fork 206 are in sliding connection with the outer slide plate group 204, the outer side of the outer slide plate group 204 is fixedly connected with the cylinder group 209, and the cylinder group 209 is arranged on the outer mounting plate 205;
the middle part of a vertical rod 207 on a shearing fork rod 206 at the tail end is sleeved with a fixing strip 210, the top end of the fixing strip 210 is fixedly connected with a movable screw rod 211, one end of the movable screw rod 211 penetrates through the top end of the top mounting plate 202 to extend to the outside, a cone nut 212 is sleeved on the movable screw rod 211, the top end of the cone nut 212 is rotationally connected with the top end of the inner wall of the top mounting plate 202, one side of the cone nut 212 is meshed with a bevel gear rod 213, and one end of the bevel gear rod 213 penetrates through the screen structure 2 and one side of the screening machine body 1 to extend to the outside.
When the limiting structure 5 drives the bevel gear rod 213 to rotate through the speed change structure 6, the bevel gear rod 213 drives the bevel nut 212 to rotate, so that the movable screw 211 moves in the bevel nut 212, the movable screw 211 moves to pull the corresponding longitudinal rods 207 through the fixing strips 210, so that the distances at the top ends of the plurality of scissor rods 206 are synchronously changed, the distances between the rest longitudinal rods 207 are synchronously changed, the area of meshes formed by the longitudinal rods 207 and the transverse rods 208 is changed, and when the fixing strips 210 pull the corresponding longitudinal rods 207, the cylinder group 209 is synchronously pushed and pulled through the outer slide plate group 204 according to the shape change of the scissor rods 206, so that the deformation of the scissor rods 206 is smoother; when the screen mesh structure is used, the screen mesh changes from small to large, so that the screen mesh structure can screen materials among different sizes, and meanwhile, in the process of changing the screen mesh from small to large, the materials which originally block the screen mesh can fall onto the blanking plate 4 along with the change of the screen mesh, so that the screen mesh structure 2 has the function of preventing the materials from being blocked.
Referring to fig. 1 to 4 of the specification, the feeding structure 3 includes a middle charging barrel 301, a platform groove 302 is formed at the bottom end of the middle charging barrel 301, one end of the platform groove 302 adjacent to a feeding hopper 304 is narrower, two ends of the middle charging barrel 301 are respectively fixedly connected with two sides of a screening frame 8 in a plugging manner, an end part of one end of the middle charging barrel 301 is rotatably sleeved with a blanking cover 303, an end part of the other end of the middle charging barrel 301 is fixedly connected with the feeding hopper 304, one end of the feeding hopper 304 is fixedly connected with a feeding motor 305, one end of the feeding motor 305 is inserted into the feeding hopper 304, an end part of the feeding hopper is fixedly connected with a packing auger rod 306, and one end of the packing auger rod 306 extends into the blanking cover 303.
When the feeding device is used, materials enter from the feeding hopper 304 and are pushed into the middle charging barrel 301 by the auger rod 306, the widths of the platform-shaped grooves 302 become larger gradually, the materials with different diameters fall down at different positions, and the materials with the oversized diameters are pushed into the discharging barrel, and wait for a worker to open the discharging cover 303 to take out the materials; because the material of different diameters falls in different positions, consequently feed structure 3 can be to the preliminary classification of material according to the size for the material more evenly falls on screen cloth structure 2, and screen cloth structure 2 sieves of being convenient for.
Referring to fig. 1 to 2 of the specification, the limit structure 5 includes two telescopic baffles 501, the bottoms of one ends of the two telescopic baffles 501 are respectively connected with two sides of the top end of the blanking plate 4 in a rotating manner, the distance between the other ends of the telescopic baffles 501 is matched with the length of the blanking port 101, the top of the other ends of the telescopic baffles 501 is rotationally connected with a limit plate 502, the top end of the limit plate 502 is fixedly connected with a limit block 503, the middle part of the limit block 503 is embedded with a screw rod 504, one end of the screw rod 504 is inserted into one side of the screening machine body 1 to extend to the outside, the other end of the screw rod 504 is inserted into the other side of the screening machine body 1, and the end of the screw rod 504 is fixedly connected with a limit motor 505.
When the invention is used, the limit motor 505 is started, so that the limit motor 505 drives the screw rod 504 to rotate, and then drives the limit block 503 and the limit plate 502 to move, the other ends of the two telescopic baffles 501 are pulled when the limit plate 502 moves, so that the moving position of the telescopic baffles 501 moves from the original feed opening 101 to the other feed opening 101, the screw rod 504 drives the screen structure 2 to operate through the speed change structure 6 when rotating, the screen structure 2 enlarges the area of a screen hole formed by the longitudinal rod 207 and the transverse rod 208, and the materials which are not screened originally continuously fall to the feed plate 4 and are discharged through the other feed opening 101.
Referring to fig. 2 to 3 of the accompanying drawings, the speed change structure 6 includes two double-headed wheels 601, a first chain transmission belt 602 is sleeved between the two double-headed wheels 601, one side of one double-headed wheel 601 is connected with a gear reducer 603 in a meshed manner, one side of the gear reducer 603 is connected with one end of the screw rod 504 in a meshed manner, the other double-headed wheel 601 is sleeved with a second chain transmission belt 604, one end of the second chain transmission belt 604 is sleeved with a thumb wheel transmission 605 and a multi-stage flywheel 606, and one side of the multi-stage flywheel 606 is fixedly connected with one end of the bevel gear rod 213.
When the screen structure is used, the screw rod 504 drives one of the double-head wheels 601 to rotate through the gear reducer 603, then drives the other double-head wheel 601 to rotate through the first chain transmission belt 602, and then drives the multi-stage flywheel 606 to rotate through the second chain transmission belt 604, and further drives the bevel gear rod 213 to rotate, so that the screen structure 2 can adjust the screen hole area, and when the screen structure is needed, the position of the second chain transmission belt 604 on the multi-stage flywheel 606 can be adjusted through the dial wheel transmission 605, so that the rotating speed of the bevel gear rod 213 is changed, and further the distance that the fixing strip 210 pulls the corresponding vertical rod 207 is changed, so that the section of the screen structure 2 with the screen area changed is controlled.
Referring to the accompanying drawings of the specification from 1 to 3, a vibrating spring group 7 is fixedly connected to the bottom end of a screening machine body 1, a screening frame 8 is fixedly connected to the bottom end of the vibrating spring group 7, a vibrating motor 9 is fixedly installed on the screening frame 8, one end of the vibrating motor 9 penetrates through the screening frame 8, an eccentric block 10 is fixedly connected to the end of the vibrating motor, and the top end of the eccentric block 10 is abutted to the bottom end of the screening machine body 1.
When the vibrating screen is used, the vibrating motor 9 is started, so that the vibrating motor 9 drives the eccentric block 10 to knock the bottom end of the screening machine body 1, and the screening machine body 1 vibrates on the vibrating spring set 7.
The screening method of the building sand screening device comprises the following steps of:
s1: starting a vibration motor 9, so that the vibration motor 9 drives an eccentric block 10 to knock the bottom end of the screening machine body 1, and the screening machine body 1 vibrates on a vibration spring set 7;
s2: starting a feeding motor 305 to drive a packing auger rod 306 to rotate, pouring materials from a feeding hopper 304, pushing the materials by the packing auger rod 306, enabling the materials to fall onto a screen structure 2 from a table-shaped groove 302 of a middle charging barrel 301 according to the size of the materials, screening the materials by the screen structure 2, then falling into a blanking plate 4, and finally discharging the materials from one of blanking openings 101;
s3: starting a limit motor 505, so that the limit motor 505 drives a screw rod 504 to rotate, and further drives a limit block 503 and a limit plate 502 to move, and when the limit plate 502 moves, the other ends of the two telescopic baffles 501 are pulled, so that the moving positions of the telescopic baffles 501 are matched with those of the other blanking port 101, and when the screw rod 504 rotates, the screen structure 2 is driven to operate through a speed change structure 6, so that the screen structure 2 enlarges the area of a screen hole formed by a longitudinal rod 207 and a transverse rod 208, and the material which is not screened originally continuously falls to the blanking plate 4 and is discharged through the other blanking port 101;
s4: when necessary, the position of the second chain transmission belt 604 on the multi-stage flywheel 606 can be adjusted through the thumb wheel transmission 605, so that the rotating speed of the bevel gear rod 213 is changed, and the distance that the fixing strip 210 pulls the corresponding longitudinal rod 207 is changed, thereby controlling the interval of the mesh area fluctuation of the screen structure 2.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. Building grit screening plant, including screening organism (1), its characterized in that: a plurality of feed openings (101) are formed in one end of the screening machine body (1), a screen structure (2) is arranged in the screening machine body (1), a feeding structure (3) is arranged on one side above the screen structure (2), a feed plate (4) is arranged below the screen structure (2), one end of the top of the feed plate (4) is rotationally connected with a limiting structure (5), the limiting structure (5) is matched with the plurality of feed openings (101), one end of the limiting structure (5) is inserted into one side of the screening machine body (1), a speed changing structure (6) is connected to the end of the limiting structure in a meshed mode, and one end of the speed changing structure (6) is matched with the screen structure (2);
the screen structure (2) comprises a bottom mounting plate (201) and a top mounting plate (202), wherein two inner sliding plates (203), an outer sliding plate group (204) and an outer mounting plate (205) are sequentially and fixedly connected between the bottom mounting plate (201) and the top mounting plate (202) from inside to outside, a plurality of fork rods (206) are slidingly connected to the inner sides of the inner sliding plates (203), the fork rods (206) on the two inner sliding plates (203) correspond to each other, the two top ends of the fork rods (206) on the same inner sliding plate (203) are sequentially hinged end to end in sequence, one top end of the fork rod (206) at the head end is rotationally connected with the corresponding inner sliding plate (203), a longitudinal rod (207) is rotationally inserted between the top ends of the corresponding two fork rods (206), a plurality of transverse rods (208) are mounted at equal intervals in a fitting mode below the longitudinal rod (207), one end of each transverse rod (208) is fixedly connected with the bottom mounting plate (201), and the other end of each transverse rod (208) is fixedly connected with the corresponding outer mounting plate (205).
The inner slide plate (203) comprises a curve part, two ends of the curve part are fixedly connected with straight line parts, the shape of the outer slide plate group (204) is matched with that of the inner slide plate (203), the outer slide plate group (204) lacks the curve part relative to the inner slide plate (203), the lower part of the scissor rod (206) is shorter than the upper part of the scissor rod (206), the bottom end of the scissor rod (206) is in sliding connection with the outer slide plate group (204), the outer side of the outer slide plate group (204) is fixedly connected with a cylinder group (209), and the cylinder group (209) is arranged on an outer mounting plate (205);
the middle part of the vertical rod (207) on the shearing fork rod (206) at the tail end is sleeved with a fixing strip (210), the top end of the fixing strip (210) is fixedly connected with a movable screw rod (211), one end of the movable screw rod (211) is inserted into the top end of the top mounting plate (202) to extend to the outside, a cone nut (212) is sleeved on the movable screw rod (211), the top end of the cone nut (212) is rotatably connected with the top end of the inner wall of the top mounting plate (202), one side of the cone nut (212) is connected with a bevel gear rod (213) in a meshed mode, and one end of the bevel gear rod (213) is inserted into the screen structure (2) and one side of the screening machine body (1) to extend to the outside;
the limiting structure (5) comprises two telescopic baffles (501), the bottoms of one ends of the two telescopic baffles (501) are respectively connected with two sides of the top end of the blanking plate (4) in a rotating mode, the distance between the other ends of the telescopic baffles (501) is matched with the length of the blanking port (101), the tops of the other ends of the telescopic baffles (501) are rotationally connected with limiting plates (502), the top ends of the limiting plates (502) are fixedly connected with limiting blocks (503), screw rods (504) are embedded in the middle of the limiting blocks (503), one ends of the screw rods (504) penetrate through one side of the screening machine body (1) to extend to the outside, the other ends of the screw rods (504) penetrate through the other side of the screening machine body (1), and the end portions of the screw rods are fixedly connected with limiting motors (505);
the speed change structure (6) comprises two double-end wheels (601), a first chain transmission belt (602) is sleeved between the two double-end wheels (601), one side of the double-end wheels (601) is connected with a gear reducer (603) in a meshed mode, one side of the gear reducer (603) is connected with one end of a screw rod (504) in a meshed mode, the other side of the double-end wheels (601) is sleeved with a second chain transmission belt (604), one end of the second chain transmission belt (604) is sleeved with a thumb wheel transmission (605) and a multi-stage flywheel (606), and one side of the multi-stage flywheel (606) is fixedly connected with one end of a bevel gear rod (213).
2. A construction sand screening plant according to claim 1, wherein: the feeding structure (3) comprises a middle charging barrel (301), a platform groove (302) is formed in the bottom end of the middle charging barrel (301), two sides of a screening rack (8) are fixedly spliced at two ends of the middle charging barrel (301) respectively, a blanking cover (303) is rotatably sleeved at one end of the middle charging barrel (301), a feeding hopper (304) is fixedly connected with the end of the other end of the middle charging barrel (301), a feeding motor (305) is fixedly connected with one end of the feeding hopper (304), one end of the feeding motor (305) is inserted into the feeding hopper (304) in a penetrating mode, an auger rod (306) is fixedly connected with the end of the feeding motor, and one end of an auger Long Gan (306) extends into the blanking cover (303).
3. A construction sand screening plant according to claim 1, wherein: the screening machine comprises a screening machine body (1), wherein a vibrating spring group (7) is fixedly connected to the bottom end of the screening machine body (1), a screening machine frame (8) is fixedly connected to the bottom end of the vibrating spring group (7), a vibrating motor (9) is fixedly installed on the screening machine frame (8), one end of the vibrating motor (9) is inserted into the screening machine frame (8), an eccentric block (10) is fixedly connected to the end of the vibrating motor, and the top end of the eccentric block (10) is abutted to the bottom end of the screening machine body (1).
4. A screening method of a construction sand screening plant according to any one of claims 1 to 3, characterised in that the screening method comprises the steps of:
s1: starting a vibration motor (9), so that the vibration motor (9) drives an eccentric block (10) to strike the bottom end of the screening machine body (1), and the screening machine body (1) vibrates on a vibration spring set (7);
s2: starting a feeding motor (305), driving a winch Long Gan (306) to rotate, pouring materials from a feed hopper (304), pushing the materials by the winch Long Gan (306), enabling the materials to fall onto a screen structure (2) from a table-shaped groove (302) of a middle charging barrel (301) according to the size of the materials, screening the materials by the screen structure (2), falling into a blanking plate (4), and finally discharging the materials from one of blanking openings (101);
s3: starting a limit motor (505), enabling the limit motor (505) to drive a screw rod (504) to rotate, further driving a limit block (503) and a limit plate (502) to move, pulling the other ends of two telescopic baffles (501) when the limit plate (502) moves, enabling the moving positions of the telescopic baffles (501) to be matched with the other blanking opening (101), enabling the screw rod (504) to drive a screen structure (2) to operate through a speed change structure (6) while rotating, enabling the screen structure (2) to enlarge the area of a screen hole formed by a longitudinal rod (207) and a cross rod (208), enabling materials which are not screened originally to continuously fall down to the blanking plate (4), and discharging the materials through the other blanking opening (101);
s4: when the screen is needed, the position of the second chain transmission belt (604) on the multi-stage flywheel (606) can be adjusted through the thumb wheel speed changer (605), so that the rotating speed of the bevel gear rod (213) is changed under the condition that the rotating speed of the screw rod (504) is unchanged, and further the distance that the fixing strip (210) pulls the corresponding longitudinal rod (207) is changed, and the section with the mesh area of the screen structure (2) changed is controlled.
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