CN114082639B - A sand and gravel sorting device for civil engineering - Google Patents

Abstract

The invention relates to the technical field of civil engineering, in particular to a sand and gravel sorting device for civil engineering, which includes a base on which a gantry frame is fixed, and also includes: a screening mechanism arranged on the base, which is used for the screening mechanism. To carry out efficient screening of sand and gravel; the intermittent feeding mechanism is set on the gantry, the screening mechanism is connected with the intermittent feeding mechanism, and the intermittent feeding mechanism is driven to the screen while the screening mechanism is sieving the sand and gravel. The sub-mechanism conveys sand and gravel intermittently; the dust removal mechanism set on the base, the screening mechanism is connected with the dust removal mechanism, and the dust removal mechanism is driven to the screening mechanism and the intermittent feeding mechanism while the screening mechanism is sieving the sand and gravel. Dust generated by work is collected. This kind of sand and gravel sorting device for civil engineering can avoid the accumulation of sand and gravel during the screening of sand and gravel, improve the screening efficiency and effect of sand and gravel, and collect the dust generated during the screening of sand and gravel to protect working environment.

Description

A sand and gravel sorting device for civil engineering

technical field

The invention relates to the technical field of civil engineering, in particular to a sand and gravel sorting device for civil engineering.

Background technique

In the process of civil engineering construction, a large amount of sand and gravel materials are needed. Because different construction requirements require different particle sizes of sand and gravel, stones of different sizes can be used for different functions, so sand and gravel materials need to be sorted , in order to separate sand and gravel particles in different particle size ranges.

The existing sand and gravel sorting equipment has a low sorting efficiency for sand and gravel, and it is easy to cause sand and gravel to accumulate during feeding, resulting in poor sorting effect and low efficiency, and the dust generated during the sorting process is not easy to collect , dissipate in the air and cause air pollution. In view of this, we propose a sand and gravel sorting device for civil engineering.

Contents of the invention

The object of the present invention is to provide a sand and gravel sorting device for civil engineering to solve the problems raised in the above-mentioned background technology. In order to achieve the above object, the present invention provides the following technical solutions: a sand and gravel sorting device for civil engineering, including a base on which a gantry frame is fixed, and also includes:

The screening mechanism installed on the base is used for efficient screening of sand and gravel;

The intermittent feeding mechanism set on the gantry, the screening mechanism is connected with the intermittent feeding mechanism, and the intermittent feeding mechanism is driven to intermittently convey the sand and gravel to the screening mechanism while the screening mechanism is screening the sand and gravel;

The dust removal mechanism is set on the base, the screening mechanism is connected with the dust removal mechanism, and the dust removal mechanism is driven to collect the dust generated by the screening mechanism and the intermittent feeding mechanism while the screening mechanism is screening the sand and gravel.

Preferably, the screening mechanism includes a motor and a screening box, the motor is fixed on the gantry frame, the two side walls of the screening box are coaxially fixedly connected with shaft one and shaft two, shaft one runs through bracket one, and can Rotate around its own axis on support one and slide linearly along its axial direction. Shaft two runs through support three, and can rotate around its own axis on support three and slide linearly along its axial direction. Both support one and support three are fixed on the pedestal.

Preferably, the first sieve plate and the second sieve plate arranged obliquely are fixed on the inner wall of the screening box, and the first sieve plate is located above the second sieve plate, and a material guide plate 1 is fixed on the lower end of the first sieve plate, and the guide plate The material plate 1 is located above the first material receiving box, the lower end of the second sieve plate is fixed with the second material guide plate, the material guide plate 2 is located above the second material receiving box, the lower end of the screening box is open, and the opening is located at the third material receiving box Above the box, the first material receiving box, the second material receiving box and the third material receiving box are all fixed on the base.

Preferably, the output shaft of the motor is transmission-connected to the rotating shaft, and the rotating shaft is fixedly connected to the bracket 2, the bracket 2 is fixed on the base, the rotating shaft shares the central axis with the shaft 1 and the shaft 2, and the shaft is fixedly connected to the shaft The first rotating roller and the second rotating roller, the first rotating roller is connected with the first shaft rod and the dust removal mechanism in transmission, and the second rotating roller is connected with the intermittent feeding mechanism through transmission.

Preferably, the intermittent feeding mechanism includes a hopper fixed on the gantry, and a discharge pipe is fixed at the lower end of the hopper, and the sand and gravel in the hopper are transported into the screening box through the discharge pipe, and a guide is fixed on the crossbeam of the gantry. rod, and the lower end of the guide rod is slidingly connected with a linear rack. One end of the linear rack is fixedly connected to the valve plate, and the other end is connected to the column of the gantry frame through a spring. The valve plate is slidingly connected to the side wall of the discharge pipe. And the discharge pipe can be blocked.

Preferably, a ring groove 1 is provided on the roller 1, and the direction of the ring groove 1 is set as a sinusoidal curve when the side wall of the roller is unfolded. Rod 1 and sliding rod 1 are plugged into ring groove 1 and can slide in ring groove 1. The other end of pull rod 2 is fixed with pull rod 1. Shaft rod 1 penetrates through and is connected to pull rod 1 by fixed axis rotation, and shaft rod 1 Two limiting protruding rings are fixed on the top, and the two limiting protruding rings are respectively located on both sides of the pull rod one. A cross brace is fixed on the support three, and a sliding rod two is fixed on the cross brace, and the shaft rod two is coaxial The third rotating roller is fixed, and the second annular groove is opened on the third rotating roller. The direction of the second annular groove is set in a V shape when the side wall of the third rotating roller is unfolded. Slide in the second ring groove.

Preferably, one end of the second roller is fixed with an annular protrusion, and the other end is coaxially fixedly connected to the first gear. On the side wall of the second roller, a bump is fixed on the side wall close to the annular protrusion. The contour of the bump is on the side wall of the second roller When it is unfolded, it is arranged in a parabolic direction. The beam of the gantry is fixed with a suspender. The circular protruding contour rolls, and the upper end of the driving rod is fixed with an arc-shaped rack, and the center of the arc-shaped rack is located on the rotation axis of the driving rod, and the arc-shaped rack is meshed with the linear rack.

Preferably, a reciprocating screw rod is connected with a fixed axis on the bracket one, and one end of the reciprocating screw rod is coaxially fixedly connected to the gear two, and the gear two is meshed with the gear one, and the reciprocating screw rod is sleeved and slidably connected. It is equipped with a sliding sleeve, and the sliding sleeve is hinged to the shifting plate through a connecting rod, and one end of the shifting plate is connected to the lower port of the discharge pipe by fixed axis rotation.

Preferably, the dust removal mechanism includes a water tank fixed on the base and a plurality of dust suction hoods, the plurality of dust suction hoods are respectively arranged at the positions where the dust escapes on the hopper and the screening box, and the upper surface of the outer wall of the water tank is fixed with Pump wheel, the impeller inside the pump wheel is connected to the roller one through the bevel gear set. The side wall of the pump wheel is fixed and communicated with the air pipe one. The sleeves on the bottom surface of the wall are connected, and the top wall of the water tank is fixed and communicated with the second air pipe.

Preferably, the tube shaft is inserted into the sleeve and rotated on a fixed axis, and the tube shaft is located inside the water tank. The upper end of the tube shaft is fixed and communicated with the air diversion pipe. Air holes are opened on the side wall of the air diversion pipe, and the impeller is connected to the air diversion pipe by transmission.

Compared with prior art, the beneficial effect of the present invention:

In the present invention, the sand and gravel materials are sorted by the screening mechanism, and the sand and gravel materials in the screening box are continuously shaken in the direction of the rotation axis while reciprocating in the horizontal direction during the screening process, thereby The sand and gravel can be quickly dispersed on the corresponding sieve plate, avoiding the accumulation of sand and gravel, and improving the screening efficiency and effect of sand and gravel.

In the present invention, the intermittent feeding mechanism is driven to carry out intermittent feeding while the screening mechanism is screening the sand and gravel, and the sand and gravel entering the screening box are shaken during the feeding process, thereby avoiding excessive accumulation of sand and gravel, thereby Ensure the efficiency and effect of the screening box on the sorting of sand and gravel.

In the present invention, the dust removal mechanism is driven to collect scattered dust while the screening mechanism is screening the sand and gravel, and the air is purified to greatly reduce the dust generated during the sorting of the sand and gravel and protect the working environment.

Description of drawings

Fig. 1 is the schematic diagram of the assembly section structure of the present invention;

Fig. 2 is the water tank sectional structure schematic diagram among the present invention;

Fig. 3 is a schematic diagram of a roll-out structure in the present invention;

Fig. 4 is the schematic diagram of the expanded structure of the second roller in the present invention;

Fig. 5 is a schematic diagram of the unfolded structure of three rotating rollers in the present invention.

In the figure: 1. Base; 2. Bracket 1; 3. Pull rod 1; 4. Gear 1; 5. Roller; 6. Lug; 7. Pull rod 2; Air pipe one; 11, sleeve; 12, water tank; 13, air pipe two; 14, pump wheel; 15, bevel gear set; 16, motor; 17, roller one; 18, ring groove one; 19, rotating shaft; Roller 2; 21, spring; 22, suspension rod; 23, linear rack; 24, lever; 25, gear 2; 26, limit convex ring; 27, connecting rod; 28, guide rod; Plate; 30, hopper; 31, discharge pipe; 32, material shifting plate; 33, sliding sleeve; 34, reciprocating screw rod; 35, shaft one; 36, material guide plate two; 37, second receiving box ; 38, the third material receiving box; 39, the first material receiving box; 40, support three; 41, the second sieve plate; 42, material guide plate one; 43, the first sieve plate; 44, screening box; 45 , shaft rod two; 46, roller three; 47, ring groove two; 48, gantry frame; 49, cross brace; 50, slide rod two; 51, pipe shaft; Arc rack; 55, annular protrusion; 56, dust cover.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Referring to Fig. 1 to Fig. 5, the present invention provides a technical solution: a sand and gravel sorting device for civil engineering, including a base 1, on which a gantry 48 is fixed, and also includes:

A screening mechanism arranged on the base 1, the screening mechanism is used for efficient screening of sand and gravel;

The intermittent feeding mechanism arranged on the gantry 48, the screening mechanism is connected with the intermittent feeding mechanism, and the intermittent feeding mechanism is driven to intermittently deliver the sand and gravel to the screening mechanism while the screening mechanism is sieving the sand and gravel;

The dust removal mechanism set on the base 1, the screening mechanism is connected with the dust removal mechanism, and the dust removal mechanism is driven to collect the dust generated by the screening mechanism and the intermittent feeding mechanism while the screening mechanism is screening the sand and gravel.

In this embodiment, the screening mechanism includes a motor 16 and a screening box 44, the motor 16 is fixed on the gantry frame 48, and the two side walls of the screening box 44 are coaxially fixedly connected with a shaft one 35 and a shaft two 45, Shaft 1 35 runs through bracket 1 2, and can rotate around its own axis on bracket 1 2 and slide along its axial line; shaft 2 45 runs through bracket 3 40, and can rotate around its own axis on bracket 3 40 And slide along its axial line, the support one 2 and the support three 40 are all fixed on the base 1, the first sieve plate 43 and the second sieve plate 41 which are arranged obliquely are fixed on the inner wall of the screening box 44, and the first sieve plate The plate 43 is positioned above the second sieve plate 41, the lower end of the first sieve plate 43 is fixed with a guide plate one 42, and the material guide plate one 42 is positioned above the first receiving box 39, and the lower end of the second sieve plate 41 is fixed with a guide plate 42. Material plate two 36, material guide plate two 36 are positioned at the second material receiving box 37 tops, the lower end opening of screening box 44, and opening is positioned at the 3rd material receiving box 38 tops, the first material receiving box 39, the second material receiving box 37 and the third material receiving box 38 are all fixed on the base 1, the output shaft of the motor 16 is connected with the rotating shaft 19 transmission, and the fixed axis rotation of the rotating shaft 19 is connected on the support two 9, and the support two 9 is fixed on the base 1, The rotating shaft 19 shares the central axis with the shaft one 35 and the shaft two 45. The rotating shaft 19 is coaxially fixedly connected with the rotating roller one 17 and the rotating roller two 20. The second roller 20 is connected to the intermittent feeding mechanism. The first roller 17 is provided with an annular groove 18. The direction of the annular groove 18 is set in a sinusoidal curve when the side wall of the first roller 17 is unfolded. The second bracket 9 runs through the And slidingly connect the pull rod two 7, one end of the pull rod two 7 is fixed with a slide rod one 8, the slide rod one 8 is inserted in the ring groove one 18 and can slide in the ring groove one 18, and the other end of the pull rod two 7 is fixed with a pull rod One 3, the shaft one 35 runs through and is connected to the pull rod one 3 for fixed axis rotation, and the shaft one 35 is fixed with two position-limiting protruding rings 26, and the two position-limiting protruding rings 26 are respectively located at the ends of the pull rod one 3 On both sides, the bracket three 40 is fixed with a cross brace 49, and the cross brace 49 is fixed with a slide bar two 50, and the shaft rod two 45 is coaxially fixed with a three-roller 46, and the three-roller 46 is provided with a ring groove two 47, the trend of the second ring groove 47 is V-shaped when the side wall of the roller three 46 is unfolded, and the two slide bars 50 are inserted in the second ring groove 47 and can slide in the second ring groove 47.

In this embodiment, the intermittent feeding mechanism includes a hopper 30 fixed on the gantry 48, the lower end of the hopper 30 is fixed with a discharge pipe 31, and the sand and gravel in the hopper 30 is transported to the screening box 44 through the discharge pipe 31 , the beam of the gantry 48 is fixed with a guide rod 28, and the lower end of the guide rod 28 is slidably connected with a linear rack 23, one end of the linear rack 23 is fixedly connected to the valve plate 29, and the other end is connected to the gantry 48 by the spring 21. The columns are connected, and the valve plate 29 is slidably connected to the side wall of the discharge pipe 31, and can block the discharge pipe 31. One end of the second roller 20 is fixed with an annular protrusion 55, and the other end is coaxially fixedly connected to the first gear. 4. A bump 6 is fixed on the side wall of the second roller 20 close to the annular protrusion 55. The contour of the bump 6 is set in a parabolic direction when the side wall of the second roller 20 is unfolded. The crossbeam of the gantry 48 is fixed with Boom 22, the lower end of boom 22 rotates on a fixed axis and connects the middle part of driving lever 24, and the lower end of driving lever 24 is actively connected with roller 5 on a fixed axis, and roller 5 can roll along the contour of bump 6 and the contour of annular protrusion 55. The upper end of bar 24 is fixed with circular-arc tooth bar 54, and the center of circle of circular-arc tooth bar 54 is positioned on the axis of rotation of driving rod 24, and circular-arc tooth bar 54 is meshed with linear tooth bar 23 links, and on support one 2 The fixed axis is rotatably connected with a reciprocating screw mandrel 34, one end of the reciprocating screw mandrel 34 is coaxially fixedly connected to the second gear 25, and the second gear 25 is meshed with the first gear 4, and the reciprocating screw mandrel 34 is sleeved and slidably connected. A sliding sleeve 33 is provided, and the sliding sleeve 33 is hinged with the material shifting plate 32 through the connecting rod 27, and one end of the material shifting plate 32 is connected to the lower port of the discharge pipe 31 in fixed axis rotation.

In this embodiment, the dust removal mechanism includes a water tank 12 fixed on the base 1 and a plurality of dust collection covers 56, and the plurality of dust collection covers 56 are respectively arranged at the positions where the dust escapes on the hopper 30 and the screening box 44, The upper surface of the outer wall of the water tank 12 is fixed with a pump wheel 14, and the impeller inside the pump wheel 14 is connected to the rotating roller 17 through a bevel gear set 15. One end communicates with each dust collection cover 56, and the other end communicates with the sleeve 11 fixed on the bottom surface of the outer wall of the water tank 12. The top wall of the water tank 12 is fixed and communicated with the air pipe 2 13, and the sleeve 11 is inserted and rotated on a fixed axis. The pipe shaft 51 is connected, and the pipe shaft 51 is located inside the water tank 12. The upper end of the pipe shaft 51 is fixed and communicated with the air distribution pipe 52. Air holes 53 are provided on the side wall of the air distribution pipe 52. The impeller and the air distribution pipe 52 are connected by transmission.

The present invention and advantages: when this kind of sand and gravel sorting device for civil engineering is used for sorting sand and gravel, the working process is as follows:

As shown in Figure 1, the starter motor 16 works, and the sand and gravel to be sorted is transported into the hopper 30 through the lifting device, and the sand and gravel in the hopper 30 is dropped into the screening box 44 through the discharge pipe 31, and the sand and gravel are After being screened by the first sieve plate 43, the larger grains of sand and gravel are blocked and transported to the first material receiving box 39 through the first material guide plate 42, and the sand and gravel falling from the sieve hole of the first sieve plate 43 passes through the first sieve plate 43. The screening of the second sieve plate 41 makes the medium-grained sand and gravel materials be blocked and transported to the first receiving box 39 through the second material guide plate 36. The opening of the lower end of the screening box 44 falls into the third material receiving box 38, so as to realize the screening of sand and gravel materials, and the first sieve plate 43 and the second sieve plate 41 are arranged obliquely, and the inclination angle is 22°--30°. Thereby, it is helpful for the rolling dispersion of sand and gravel, and improves the screening efficiency and effect.

As shown in Figures 1 and 3, after the motor 16 is started, it synchronously drives the rotating roller one 17 to rotate through the rotating shaft 19, so that the rotating roller one 17 rotates and at the same time makes the pull rod two 7 Carry out reciprocating horizontal movement on the bracket two 9, so that the pull rod two 7 exerts force on the shaft one 35 through the pull rod one 3, and synchronously drives the shaft one 35 to perform reciprocating horizontal movement on the bracket one 2, The two position-limiting protruding rings 26 on the shaft-135 prevent the pull-rod-3 from being loosened from the shaft-35, and improve the stability and reliability of the force exerted by the pull-rod-3 on the shaft-35, so that the shaft-35 synchronously drives the screen The reciprocating horizontal movement of the sub-box 44 makes the sand and gravel in the screening box 44 shake continuously in the horizontal direction, so that the sand and gravel can be quickly dispersed on the corresponding sieve plate, avoiding the accumulation of sand and gravel, and improving the quality of the sand and gravel. Screening efficiency and effect.

As mentioned above, while the screening box 44 is moving reciprocatingly in the horizontal direction, the screening box 44 is synchronously driven by the second shaft 45 to move the third roller 46 to reciprocate horizontally, as shown in Figures 1 and 5, thereby Under the force of the ring groove 2 47 and the sliding rod 2 50, the rotating roller 3 46 is reciprocatingly rotated around its own central axis, and then the rotating roller 3 46 drives the screening box 44 around the shaft 2 through the shaft 2 45 The central axis of 45 rotates reciprocatingly, so that the sand and gravel in the screening box 44 is shaken continuously in the direction of the rotation axis while reciprocating in the horizontal direction, so that the sand and gravel can be quickly dispersed in the corresponding Sieve plate, and further improve the screening efficiency and effect of sand and gravel.

As shown in Figures 1 and 4, when the rotating shaft 19 drives the rotating roller one 17 to rotate, it also drives the rotating roller two 20 to rotate synchronously, so that the rotating roller two 20 synchronously drives the bump 6 to rotate. 5 contacts, the bump 6 applies a rightward thrust to the lower end of the driving rod 24 through the roller 5, and the lower end of the driving rod 24 moves to the right under the thrust and makes the driving rod 24 drive the arc-shaped rack 54 to rotate counterclockwise, thereby The arc-shaped rack 54 drives the linear rack 23 to move to the left, and at the same time compresses the spring 21 to obtain a restoring force. When the linear rack 23 moves to the left, it simultaneously drives the valve plate 29 to move to the left, thereby making the valve The plate 29 does not block the discharge pipe 31, and the gravel in the hopper 30 is put into the screening box 44 through the discharge pipe 31. When the thrust of the bump 6 on the roller 5 decreases, under the restoring force of the spring 21, the straight line The straight rack 23 moves to the right, and the linear rack 23 synchronously drives the valve plate 29 to block the discharge pipe 31, and then stops conveying sand and gravel to the screening box 44, and the rightward movement of the straight rack 23 passes through the circle The arc-shaped rack 54 drives the driving lever 24 to rotate clockwise and makes the roller 5 roll along the contour of the annular protrusion 55, so that the valve plate 29 can be intermittently driven to discharge the discharge pipe 31 during the rotation of the second roller 20. Blocking, thereby realizing the intermittent input of sand and gravel to the inside of the screening box 44, avoiding excessive accumulation of sand and gravel, thereby ensuring the screening efficiency and effect of the screening box 44 on sand and gravel.

As mentioned above, when the rotating roller 20 rotates, the gear 2 25 is driven by the gear 4 to rotate, so that the gear 2 25 synchronously drives the reciprocating screw rod 34 to rotate, so that the sliding sleeve 33 drives the shifting plate 32 through the connecting rod 27 The lower port of the discharge pipe 31 swings up and down continuously, so that the sand and gravel discharged from the discharge pipe 31 are shaken by the shifting plate 32, and then dispersedly fall into the screening box 44, thereby further avoiding the accumulation of the sand and gravel , and improve the screening efficiency and effect of sand and gravel.

As shown in Figures 1 and 2, each dust collection cover 56 is arranged at the position where dust escapes on the hopper 30 and the screening box 44, such as the upper opening of the hopper 30, the discharge port of the discharge pipe 31, and screening At the upper port of the box 44, at each material guide plate, at the lower opening of the screening box 44, etc., the rotation of the rotating roller 17 synchronously drives the impeller inside the pump wheel 14 to rotate through the bevel gear set 15, so that the impeller passes through the trachea 10 The dust dissipated at each dust collection cover 56 is sucked and collected, and transported to the sleeve 11 through the air pipe 10, then enters the shunt air pipe 52 through the pipe shaft 51, and finally transported to the water liquid through each air hole 53, and uses water The liquid collects the dust and purifies the air. The purified air is discharged through the air pipe 2 13, thereby greatly reducing the dust generated in the sand and gravel material sorting process and protecting the working environment. Moreover, the rotation of the impeller synchronously drives the diversion air pipe 52 to rotate, thereby making the air It can be evenly dispersed in water to improve the air purification effect.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer" , "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should therefore not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Claims (7)

1. A civil engineering sand and gravel sorting device, comprising a base (1), on which a gantry (48) is fixed, is characterized in that: also includes: A screening mechanism arranged on the base (1), the screening mechanism is used for efficient screening of sand and gravel; The intermittent feeding mechanism arranged on the gantry (48), the screening mechanism is connected with the intermittent feeding mechanism, and drives the intermittent feeding mechanism to the screening mechanism while screening the sand and gravel. Conveying sand and gravel; The dust removal mechanism arranged on the base (1), the screening mechanism is connected with the dust removal mechanism, and the dust removal mechanism is driven to work on the screening mechanism and the intermittent feeding mechanism while the screening mechanism is screening the sand and gravel. dust collection; Described screening mechanism comprises motor (16) and screening box (44), and described motor (16) is fixed on the gantry frame (48), and the coaxial fixed connection on the two sidewalls of described screening box (44) Shaft 1 (35) and shaft 2 (45) are arranged, and described shaft 1 (35) runs through support 1 (2), and can rotate around its own axis on support 1 (2) and along its axial line Sliding, the shaft rod two (45) runs through the support three (40), and can rotate around its own axis on the support three (40) and slide linearly along its axial direction, the support one (2) and the support three ( 40) are all fixed on the base (1); The output shaft of the motor (16) is transmission-connected to the rotating shaft (19), and the rotating shaft (19) is connected to the support two (9) in fixed axis rotation, and the support two (9) is fixed on the base (1), The rotating shaft (19) shares the central axis with shaft one (35) and shaft two (45), and the rotating shaft (19) is coaxially fixedly connected with the first rotating roller (17) and the second rotating roller (20). The first rotating roller (17) is respectively connected with the shaft rod one (35) and the dust removal mechanism by transmission, and the second rotating roller (20) is connected by transmission with the intermittent feeding mechanism; The first roller (17) is provided with an annular groove one (18), and the trend of the first annular groove (18) is sinusoidal when the side wall of the first roller (17) is unfolded. (9) runs through and slidably connects the two pull rods (7), one end of the two pull rods (7) is fixed with a slide rod one (8), and the slide rod one (8) is plugged into the ring groove one (18) And can slide in ring groove 1 (18), the other end of described pull rod 2 (7) is fixed with pull rod 1 (3), and described axle rod 1 (35) penetrates and fixed axis rotation is connected on pull rod 1 (3) , and two position-limiting protruding rings (26) are fixed on the shaft rod one (35), and the two position-limiting protruding rings (26) are respectively located on both sides of the pull rod one (3), and the bracket three (40 ) is fixed with a cross brace (49), and a slide bar two (50) is fixed on the cross brace (49), and a rotating roller three (46) is coaxially fixed on the shaft rod two (45), and the rotating roller three (46) is provided with two ring grooves (47), and the trend of the two ring grooves (47) is V-shaped when the side walls of the three rollers (46) are unfolded, and the two slide rods (50) are inserted Connected in the ring groove two (47) and can slide in the ring groove two (47). 2. A kind of sand and gravel sorting device for civil engineering according to claim 1, characterized in that: the first sieve plate (43) and the second sieve plate (43) arranged obliquely are fixed on the inner wall of the sieving box (44). plate (41), and the first sieve plate (43) is located above the second sieve plate (41), the lower end of the first sieve plate (43) is fixed with a material guide plate one (42), and the material guide plate one ( 42) Located above the first material receiving box (39), the lower end of the second sieve plate (41) is fixed with a second material guide plate (36), and the second material guide plate (36) is located at the second material receiving box ( 37) above, the lower end of the screening box (44) is open, and the opening is above the third receiving box (38), the first receiving box (39), the second receiving box (37) and the first receiving box (37) Three receiving boxes (38) are all fixed on the base (1). 3. A kind of sand and gravel sorting device for civil engineering according to claim 1, characterized in that: the intermittent feeding mechanism comprises a hopper (30) fixed on the gantry (48), and the hopper (30 ) is fixed with a discharge pipe (31), and the sand and gravel in the hopper (30) is delivered to the screening box (44) through the discharge pipe (31), and the crossbeam of the gantry (48) is fixed with A guide rod (28), and the lower end of the guide rod (28) is slidingly connected with a linear rack (23), one end of the linear rack (23) is fixedly connected to the valve plate (29), and the other end is connected to the valve plate (29) by a spring (21) Connected with the column of the gantry (48), the valve plate (29) is slidingly connected on the side wall of the discharge pipe (31), and can block the discharge pipe (31). 4. A kind of sand and gravel sorting device for civil engineering according to claim 3, characterized in that: one end of the second rotating roller (20) is fixed with an annular protrusion (55), and the other end is coaxially fixedly connected to a gear One (4), the side wall of the second roller (20) is fixed with a bump (6) near the end of the annular protrusion (55), and the outline of the bump (6) is on the side of the second roller (20). When the wall is unfolded, it is arranged in a parabolic direction. The beam of the gantry (48) is fixed with a suspender (22), and the lower end of the suspender (22) is rotated on a fixed axis to connect the middle part of the driving lever (24). The fixed axis of the lower end of the driving lever (24) is actively connected with a roller (5), and the roller (5) can roll along the contour of the projection (6) and the contour of the annular protrusion (55), and the upper end of the driving lever (24) is fixed Arc-shaped tooth bar (54) is arranged, and the center of circle of arc-shaped tooth bar (54) is positioned on the rotation axis of driving lever (24), and described arc-shaped tooth bar (54) and linear tooth bar (23) Mesh links. 5. A kind of sand and gravel sorting device for civil engineering according to claim 4, characterized in that: said support one (2) is connected with a reciprocating screw rod (34) for fixed axis rotation, and said reciprocating screw rod (34) is One end of the rod (34) is fixedly connected to the second gear (25) coaxially, and the second gear (25) is meshed with the first gear (4). The sliding sleeve (33), and the sliding sleeve (33) is hinged with the material shifting plate (32) through the connecting rod (27), and one end of the material shifting plate (32) is connected to the lower port of the discharge pipe (31) in fixed axis rotation superior. 6. A sand and gravel sorting device for civil engineering according to claim 3, characterized in that: the dust removal mechanism includes a water tank (12) fixed on the base (1) and a plurality of dust collection covers (56 ), a plurality of dust collection covers (56) are respectively arranged on the hopper (30) and the position where the dust escapes on the screening box (44), and the upper surface of the outer wall of the water tank (12) is fixed with a pump wheel (14 ), the impeller inside the pump wheel (14) is connected to the roller one (17) through a bevel gear set (15), and the side wall of the pump wheel (14) is fixed and communicated with the air pipe one (10). One end of the air pipe one (10) communicates with each dust collection cover (56), and the other end communicates with the sleeve (11) fixed on the bottom surface of the outer wall of the water tank (12). On the top wall of the water tank (12) Fix and connect the trachea two (13). 7. A sand and gravel sorting device for civil engineering according to claim 6, characterized in that: the sleeve (11) is plugged in and connected to the tube shaft (51) by fixed axis rotation, and the tube shaft (51 ) is located inside the water tank (12), the upper end of the pipe shaft (51) is fixed and communicated with the air distribution pipe (52), the air hole (53) is provided on the side wall of the air distribution pipe (52), and the impeller and the air distribution pipe ( 52) Transmission connection.

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