CN217250557U - Civil construction engineering is with small-size screening sand device - Google Patents

Abstract

The utility model relates to a civil and architectural engineering technical field discloses a building and timber construction engineering is with small-size screening sand device, include: the box body is provided with a feeding hopper, and the feeding hopper is arranged at the top of the box body; the supporting legs are arranged at the bottom of the box body; further comprising: the first sand screening plate is transversely and obliquely arranged in the box body; the second sand screening plate is transversely obliquely arranged in the box body, and the first sand screening plate and the second sand screening plate are arranged in a vertically staggered manner; the higher side of the first sand sieving plate and the second sand sieving plate is a feeding end, and the lower side of the first sand sieving plate and the second sand sieving plate is a discharging end; the first sieve plate power component is arranged at the bottom of the higher side of the first sand sieving plate; the second sieve plate power component is arranged at the bottom of the higher side of the second sand sieving plate; the first sieve plate power component and the second sieve plate power component are respectively used for controlling the first sand sieving plate and the second sand sieving plate to shake up and down; and the air supply component is arranged between the first sand screening plate and the second sand screening plate.

Description

Civil construction engineering is with small-size screening sand device

Technical Field

The utility model relates to a civil construction engineering technical field especially relates to a building construction engineering is with small-size screening sand device.

Background

At present, civil engineering refers to engineering entities for surveying, planning, designing, constructing, installing and maintaining various technical works and the completion thereof, which are carried out for newly building, reconstructing or expanding buildings, structures, related supporting facilities and the like of various projects except house buildings, and a lot of sand is used in the construction process of civil engineering, and is usually screened by a sand screening machine before being used.

Because the demand of different construction operations to fines particle diameters such as sand is different, just need use screening sand device to sieve the sand, however traditional screening sand machine for civil engineering, the structure is comparatively simple, and screening sand is inefficient, meets the sand of caking and can not break up its fine, need carry out a lot of screening and just can reach operation requirement, and the practicality is lower.

SUMMERY OF THE UTILITY MODEL

The application provides a small-size screening sand device for civil construction engineering to solve the lower problem of current screening sand machine screening sand efficiency.

In order to solve the technical problem, the application provides a small-size screening sand device for civil engineering, includes: the box body is provided with a feeding hopper, and the feeding hopper is arranged at the top of the box body; the supporting legs are arranged at the bottom of the box body; further comprising: the first sand screening plate is transversely and obliquely arranged in the box body; the second sand screening plate is transversely obliquely arranged in the box body, and the first sand screening plate and the second sand screening plate are arranged in a vertically staggered manner; the higher side of the first sand screening plate and the second sand screening plate is a feeding end, and the lower side of the first sand screening plate and the second sand screening plate is a discharging end; the first sieve plate power component is arranged at the bottom of the higher side of the first sand sieving plate; the second sieve plate power component is arranged at the bottom of the higher side of the second sand sieving plate; the first sieve plate power component and the second sieve plate power component are respectively used for controlling the first sand sieving plate and the second sand sieving plate to shake up and down; and the air supply component is arranged between the first sand screening plate and the second sand screening plate.

In some embodiments of the application, elastic ropes are arranged at the feeding ends of the first sand sieving plate and the second sand sieving plate, and the other ends of the two elastic ropes are connected to the inner wall of the box body; the discharge end of first screening sand board and second screening sand board stretches out to the box outside, just the discharge end of first screening sand board and second screening sand board all rotates through articulated seat with the box lateral wall to be connected, articulated seat is fixed in on the box lateral wall.

In some embodiments of the present application, the first sieve plate power member includes a first motor, a first transmission shaft connected to the first motor, a first eccentric drum fixed to the first transmission shaft, and a first bevel gear disposed at one side of the eccentric drum at an interval, wherein an outer surface of the eccentric drum contacts a bottom surface of the first sand sieving plate feeding port.

In some embodiments of the present application, the second sieve plate power member includes a second motor, a second transmission shaft connected to the second motor, and a second eccentric roller fixed to the second transmission shaft, wherein an outer surface of the second eccentric roller contacts a bottom surface of the second sand sieving plate feeding hole.

In some embodiments of this application, the air supply component is including the first dwang, second dwang and the third dwang that connect gradually, the one end fixedly connected with and the second bevel gear of first bevel gear engaged with of first dwang, the other end fixedly connected with third bevel gear of first dwang, the second dwang passes through branch and rotates the connection on the outer wall of box, and the fourth bevel gear of upper end fixedly connected with and third bevel gear engaged with, the lower extreme fixedly connected with fifth bevel gear of second dwang, the third dwang rotates the connection and is close to the lower extreme of second dwang at the box, and one end fixedly connected with and fifth bevel gear engaged with sixth bevel gear, the other end of third dwang extends into in the box, and fixedly connected with impeller.

In some embodiments of this application, the outside of box lateral wall the relative position of first dwang, second dwang and third dwang is provided with the protective housing.

In some embodiments of this application, one side of box upper end, feed hopper is provided with the dust absorption component, the dust absorption component is connected in the dust catcher, stretches into the dust absorption pipe to the box including being fixed in the dust catcher of box upper end, sets up in the water tank of dust catcher one side, the gas outlet and the water tank of dust catcher are through going out the dirt union coupling, it stretches into below the horizontal plane to the water tank bottom to go out dirt pipe one end.

In some embodiments of this application, the bottom is provided with the fine sand collecting box in the box, the bottom of fine sand collecting box is provided with a plurality of gyro wheels, the bottom is provided with the spout in the box, the gyro wheel rolls along the spout, the box lateral wall along spout length direction, for the fine sand collecting box be provided with the chamber door.

In some embodiments of this application, the fine sand collecting box is provided with the handle near the one end in chamber door, and the one end of keeping away from the chamber door is provided with first magnetic path, be fixed with the second magnetic path with first magnetic path looks adaptation on the inner wall of box.

In some embodiments of this application, the feed hopper is interior to be close to the one end of discharge gate and to be connected with the closing plate through torsional spring symmetry rotation.

Compared with the prior art the utility model has the following characteristics and beneficial effect:

1. according to the small sand screening device for the civil construction engineering, through the arrangement of the first sand screening plate and the second sand screening plate, sand can be screened in multiple stages, so that the screened sand can meet different use requirements, and the practicability of the device is effectively improved;

2. according to the small sand screening device for the civil construction engineering, the feeding funnel is arranged on one side of the sand screening box, which is far away from the discharge end of the first sand screening plate, and the transmission assembly and the impeller are arranged, so that sand can stay on the first sand screening plate and the second sand screening plate for a longer time, the agglomerated sand is fully scattered, the sand screening effect is improved, and the sand screening quality and the sand screening efficiency of the device are effectively improved;

3. this small-size screening sand device for civil construction engineering through the setting of dust catcher, dust absorption pipe, water tank, can siphon away the smoke and dust that produces when sieving sand and filter to prevent that the smoke and dust from wafting into the air, cause the injury to environment and staff, the effectual feature of environmental protection that has improved the device.

The part that does not relate to in the device all is the same with prior art or can adopt prior art to realize, the utility model discloses can make the sand stop the time of being of a specified duration on first sieve sand board, the second sieve sand board to carry out abundant shake with the sand of caking and loose, improve the screening effect to the sand, the effectual sieve husky quality and the sieve husky efficiency that have improved the device, the practicality is higher, can satisfy the user demand in the in-service use, is suitable for using widely.

Drawings

Fig. 1 is a schematic structural view of a small sand screening device for civil and architectural engineering according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a portion a in fig. 1 of a small sand sieving device for civil engineering of the present invention;

fig. 3 is a schematic structural view of a portion B in fig. 1 of a small sand sieving device for civil engineering of the present invention;

fig. 4 is the embodiment of the utility model provides a first sieve power component and second sieve power component schematic structure in small-size screening sand device for civil engineering.

In the figure, 100, a box body; 110. a first sand screen; 120. a second sand screen; 130. an elastic cord; 140. a hinged seat; 150. a chute; 160. a box door; 170. a second magnetic block; 200. a feed hopper; 210. a sealing plate; 300. a support leg; 400. an air supply member; 410. a first rotating lever; 411. a second bevel gear; 412. a third bevel gear; 420. a second rotating rod; 421. a fourth bevel gear; 422. a fifth bevel gear; 430. a third rotating rod; 431. a sixth bevel gear; 432. an impeller; 500. a first sieve plate power member; 510. a first motor; 520. a first drive shaft; 530. a first eccentric drum; 540. a first bevel gear; 600. a second screen deck power member; 610. a second motor; 620. a second drive shaft; 630. a second eccentric drum; 700. a protective box; 800. a dust-collecting member; 810. a dust collector; 820. a dust collection pipe; 830. a water tank; 840. a dust outlet pipe; 900. a fine sand collection box; 910. a roller; 920. a first magnetic block.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As shown in fig. 1 to 4, according to some embodiments of the present application, a small-sized sand sieving apparatus for civil engineering includes: the box body 100 and the feeding hopper 200 are arranged at the top of the box body 100; the supporting legs 300 are arranged at the bottom of the box body 100; further comprising: a first sand sieving plate 110 which is transversely and obliquely arranged in the box body 100; the second sand sieving plate 120 is transversely obliquely arranged in the box body 100, and the first sand sieving plate 110 and the second sand sieving plate 120 are arranged in a vertically staggered manner; the higher side of the first sand sieving plate 110 and the second sand sieving plate 120 is a feeding end, and the lower side is a discharging end; a first sieve plate power member 500 disposed at the bottom of the higher side of the first sand sieving plate 110; a second sieve plate power member 600 disposed at the bottom of the higher side of the second sand sieving plate 120; the first sieve plate power member 500 and the second sieve plate power member 600 are respectively used for controlling the first sand sieving plate 110 and the second sand sieving plate 120 to shake up and down; and a blowing member 400 disposed between the first sand sieving plate 110 and the second sand sieving plate 120.

According to some embodiments of the present application, the feeding ends of the first sand sieving plate 110 and the second sand sieving plate 120 are provided with elastic ropes 130, and the other ends of the two elastic ropes 130 are connected to the inner wall of the box 100; the discharge ends of the first sand sieving plate 110 and the second sand sieving plate 120 extend out of the box body 100, the discharge ends of the first sand sieving plate 110 and the second sand sieving plate 120 are rotatably connected with the side wall of the box body 100 through a hinge base 140, and the hinge base 140 is fixed on the side wall of the box body 100.

According to some embodiments of the present application, the first screen deck power member 500 includes a first motor 510, a first transmission shaft 520 connected to the first motor 510, a first eccentric roller 530 fixed to the first transmission shaft 520, and a first bevel gear 540 spaced apart at one side of the eccentric roller, an outer surface of the eccentric roller contacting a bottom surface of the inlet of the first screen deck 110.

According to some embodiments of the present application, the second screen deck power member 600 includes a second motor 610, a second transmission shaft 620 connected to the second motor 610, and a second eccentric drum 630 fixed to the second transmission shaft 620, wherein an outer surface of the second eccentric drum 630 contacts a bottom surface of the feeding hole of the second sand screening plate 120.

According to some embodiments of the present application, the blowing member 400 includes a first rotating rod 410, a second rotating rod 420 and a third rotating rod 430 which are connected in sequence, one end of the first rotating rod 410 is fixedly connected with a second bevel gear 411 engaged with a first bevel gear 540, the other end of the first rotating rod 410 is fixedly connected with a third bevel gear 412, the second rotating rod 420 is rotatably connected to the outer wall of the case 100 through a support rod, and the upper end is fixedly connected with a fourth bevel gear 421 engaged with the third bevel gear 412, the lower end of the second rotating rod 420 is fixedly connected with a fifth bevel gear 422, the third rotating rod 430 is rotatably connected to the lower end of the case 100 near the second rotating rod 420, and one end is fixedly connected with a sixth bevel gear 431 engaged with the fifth bevel gear 422, the other end of the third rotating rod 430 extends into the case 100, and an impeller 432 is fixedly connected.

According to some embodiments of the present application, the shielding box 700 is disposed at the outer side of the sidewall of the box body 100, and at the relative positions of the first rotating lever 410, the second rotating lever 420 and the third rotating lever 430.

It should be noted here that, through the arrangement of the protection box 700, the first rotating rod 410, the second rotating rod 420, the third rotating rod 430, the third bevel gear 412, the fourth bevel gear 421, the fifth bevel gear 422, and the sixth bevel gear 431 can be hidden, so that the worker is prevented from being damaged when collecting sand, and the practicability of the device is effectively improved.

According to some embodiments of the present application, a dust suction member 800 is disposed at an upper end of the box 100 and at one side of the feeding funnel 200, the dust suction member 800 includes a dust collector 810 fixed at an upper end of the box 100, a dust suction pipe 820 connected to the dust collector 810 and extending into the box 100, and a water tank 830 disposed at one side of the dust collector 810, an air outlet of the dust collector 810 is connected to the water tank 830 through a dust outlet pipe 840, and one end of the dust outlet pipe 840 extends below a horizontal plane of a bottom of the water tank 830.

It should be noted that the dust collector 810 sucks away the dust generated during sand screening through the dust collection pipe 820, and then introduces the dust into the bottom of the water tank 830 through the dust outlet pipe 840, so that the dust and the gas are separated under the action of water, the dust is retained in the water tank 830, and the filtered gas is blown upwards to be discharged, so that the worker is in a safe working environment, and the probability of harm of the dust to the body of the worker is reduced.

According to some embodiments of the present application, the fine sand collecting box 900 is disposed at the bottom of the box 100, the plurality of rollers 910 are disposed at the bottom of the fine sand collecting box 900, the sliding groove 150 is disposed at the bottom of the box 100, the rollers 910 roll along the sliding groove 150, and the box 100 is provided with a box door 160 along the length direction of the sliding groove 150 relative to the fine sand collecting box 900.

According to some embodiments of the present application, a handle is disposed at one end of the fine sand collecting box 900 close to the door 160, a first magnetic block 920 is disposed at one end far away from the door 160, and a second magnetic block 170 adapted to the first magnetic block 920 is fixed on the inner wall of the box 100.

What need to explain here is, through the setting of first magnetic path 920, second magnetic path 170, when screening sand, can play fixed spacing effect to fine sand collecting box 900 to improve the stability of fine sand collecting box 900, prevent that fine sand collecting box 900 from rocking about, the effectual stability that improves fine sand collecting box 900.

According to some embodiments of the present application, a sealing plate 210 is symmetrically and rotatably connected to an end of the hopper 200 near the discharge hole by a torsion spring.

It should be noted here that the sealing plate 210 is opened under the action of gravity of sand, so as to convey the sand to the first sand sieving plate 110, and after the conveying is completed, the sealing plate 210 returns to the original position under the action of the torsion spring, so as to seal the feeding funnel 200, and prevent the smoke generated during sand sieving from floating out through the feeding funnel 200, thereby affecting the environment.

According to some embodiments of the present application, in use, a worker moves the device to a designated position for work, then powers on the electric equipment on the device, places the collecting boxes on two sides of the box 100, so that sand on the first sand sieving plate 110 and the second sand sieving plate 120 can flow into the collecting boxes, opens the box door 160, places the fine sand collecting box 900 into the box 100, conveys sand to be sieved into the box 100 through the feeding hopper 200, drops the sand into the box 100 onto the first sand sieving plate 110, starts the first motor 510 and the second motor 610, rotates the first eccentric roller 530 and the second eccentric roller 630 through the first transmission shaft 520 and the second transmission shaft 620, and drives the first sand sieving plate 530 and the second eccentric roller 630 under the action of the elastic rope 130 110. The second sand sieving plate 120 is shaken rapidly, sand smaller than the sieve holes of the first sand sieving plate 110 falls onto the second sand sieving plate 120, then sand smaller than the second sand sieving plate 120 falls into the fine sand collecting box 900, sand left on the first sand sieving plate 110 and the second sand sieving plate 120 respectively moves to the discharge end under the continuous shaking of the first sand sieving plate 110 and the second sand sieving plate 120, and finally falls into the corresponding collecting box, thereby completing the multi-stage sieving of the sand, so that the sieved sand can meet different use requirements, the practicability of the device is effectively improved, when the first transmission shaft 520 at the lower end of the first sand sieving plate 110 drives the first eccentric roller 530 to rotate, the first bevel gear 540 can be driven to rotate at the moment, the first bevel gear 540 then drives the first rotating rod 410 to rotate through the second bevel gear 411, the first rotating rod 410 then drives the third bevel gear 412 to rotate, the third bevel gear 412 drives the second rotating rod 420 to rotate through the fourth bevel gear 421, the second rotating rod 420 drives the fifth bevel gear 422 to rotate, the fifth bevel gear 422 drives the third rotating rod 430 to rotate through the sixth bevel gear 431, so that the third rotating rod 430 drives the impeller 432 to rotate, the impeller 432 generates wind to blow towards the side of the second sand sieving plate 120 far away from the discharging end, thereby blowing the sand screened and dropped from the first sand screening plate 110 to the side of the second sand screening plate 120 far away from the discharge end, so that the sand stays on the second sand screening plate 120 for a longer time, by providing the feed hopper 200 at a side of the box 100 away from the discharge end of the first sand sieving plate 110, sand can stay on the first sand sieving plate 110 for a longer time, thereby effectual improvement to the screening efficiency of sand, further improve the device to the screening quality of sand.

To sum up, the utility model relates to a civil construction technical field discloses a building construction engineering is with small-size screening sand device, include: the box body is provided with a feeding hopper, and the feeding hopper is arranged at the top of the box body; the supporting legs are arranged at the bottom of the box body; further comprising: the first sand screening plate is transversely and obliquely arranged in the box body; the second sand screening plate is transversely obliquely arranged in the box body, and the first sand screening plate and the second sand screening plate are arranged in a vertically staggered manner; the higher side of the first sand sieving plate and the second sand sieving plate is a feeding end, and the lower side of the first sand sieving plate and the second sand sieving plate is a discharging end; the first sieve plate power component is arranged at the bottom of the higher side of the first sand sieving plate; the second sieve plate power component is arranged at the bottom of the higher side of the second sand sieving plate; the first sieve plate power component and the second sieve plate power component are respectively used for controlling the first sand sieving plate and the second sand sieving plate to shake up and down; the air supply component sets up between first sieve husky board and second sieve husky board to carry out abundant shaking with the sand of caking and scatter, improve the screening effect to the sand, the effectual sieve husky quality and the sieve husky efficiency that have improved the device, the practicality is higher, can satisfy the user demand in the in-service use, is suitable for using widely.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (10)

1. A small-size screening sand device for civil engineering includes: a box body (100),

the feeding hopper (200) is arranged at the top of the box body (100);

the supporting legs (300) are arranged at the bottom of the box body (100);

it is characterized by also comprising:

the first sand screening plate (110) is transversely and obliquely arranged in the box body (100);

the second sand screening plate (120) is transversely obliquely arranged in the box body (100), and the first sand screening plate (110) and the second sand screening plate (120) are arranged in a vertically staggered manner; the higher side of the first sand sieving plate (110) and the second sand sieving plate (120) is a feeding end, and the lower side of the first sand sieving plate and the second sand sieving plate is a discharging end;

the first sieve plate power member (500) is arranged at the bottom of the higher side of the first sand sieving plate (110);

the second sieve plate power component (600) is arranged at the bottom of the higher side of the second sand sieving plate (120); the first sieve plate power member (500) and the second sieve plate power member (600) are respectively used for controlling the first sand sieving plate (110) and the second sand sieving plate (120) to shake up and down;

and the air supply component (400) is arranged between the first sand screening plate (110) and the second sand screening plate (120).

2. The small sand screening device for civil engineering as claimed in claim 1, wherein the feeding ends of the first sand screening plate (110) and the second sand screening plate (120) are provided with elastic ropes (130), and the other ends of the two elastic ropes (130) are connected to the inner wall of the box body (100); the discharge end of first screening sand board (110) and second screening sand board (120) stretches out to the box (100) outside, just the discharge end of first screening sand board (110) and second screening sand board (120) all rotates through articulated seat (140) with box (100) lateral wall and is connected, articulated seat (140) are fixed in on box (100) lateral wall.

3. The small-sized sand screening device for civil engineering construction according to claim 1, wherein the first screen plate power member (500) comprises a first motor (510), a first transmission shaft (520) connected to the first motor (510), a first eccentric drum (530) fixed to the first transmission shaft (520), and a first bevel gear (540) spaced apart from one side of the eccentric drum, and an outer surface of the eccentric drum is in contact with a bottom surface of the inlet of the first screen plate (110).

4. The small-sized sand screening device for civil engineering work of claim 1, wherein the second screen deck power member (600) comprises a second motor (610), a second transmission shaft (620) connected to the second motor (610), and a second eccentric drum (630) fixed to the second transmission shaft (620), wherein an outer surface of the second eccentric drum (630) is in contact with a bottom surface of the feed opening of the second sand screening deck (120).

5. The small-sized sand screening apparatus for civil construction engineering according to claim 1, wherein the blowing member (400) comprises a first rotation lever (410), a second rotation lever (420) and a third rotation lever (430) which are connected in sequence, one end of the first rotation lever (410) is fixedly connected with a second bevel gear (411) engaged with the first bevel gear (540), the other end of the first rotation lever (410) is fixedly connected with a third bevel gear (412), the second rotation lever (420) is rotatably connected to the outer wall of the box body (100) through a support rod, the upper end of the second rotation lever is fixedly connected with a fourth bevel gear (421) engaged with the third bevel gear (412), the lower end of the second rotation lever (420) is fixedly connected with a fifth bevel gear (422), the third rotation lever (430) is rotatably connected to the lower end of the box body (100) close to the second rotation lever (420), and one end of the third rotating rod (430) is fixedly connected with a sixth bevel gear (431) which is meshed with the fifth bevel gear (422), the other end of the third rotating rod (430) extends into the box body (100), and an impeller (432) is fixedly connected with the third rotating rod.

6. The small-sized sand screening device for civil engineering according to claim 5, wherein a guard box (700) is provided at the outer side of the side wall of the box body (100) and at the relative positions of the first rotating lever (410), the second rotating lever (420) and the third rotating lever (430).

7. The small-sized sand screening device for civil engineering as claimed in claim 1, wherein a dust suction member (800) is disposed at the upper end of the box body (100) and at one side of the feed hopper (200), the dust suction member (800) comprises a dust suction machine (810) fixed at the upper end of the box body (100), a dust suction pipe (820) connected to the dust suction machine (810) and extending into the box body (100), and a water tank (830) disposed at one side of the dust suction machine (810), wherein an air outlet of the dust suction machine (810) is connected with the water tank (830) through a dust outlet pipe (840), and one end of the dust outlet pipe (840) extends below the water level at the bottom of the water tank (830).

8. The small-sized sand screening device for civil engineering as claimed in claim 1, wherein the box body (100) is provided with a fine sand collecting box (900) at the bottom, the fine sand collecting box (900) is provided with a plurality of rollers (910) at the bottom, the box body (100) is provided with a chute (150) at the bottom, the rollers (910) roll along the chute (150), and the side wall of the box body (100) is provided with a box door (160) relative to the fine sand collecting box (900) along the length direction of the chute (150).

9. The small-sized sand screening device for civil construction engineering as claimed in claim 8, wherein the end of the fine sand collecting box (900) close to the box door (160) is provided with a handle, the end far away from the box door (160) is provided with a first magnet (920), and the inner wall of the box body (100) is fixed with a second magnet (170) matched with the first magnet (920).

10. The small-sized sand screening device for civil engineering work according to any one of claims 1 to 9, wherein a sealing plate (210) is symmetrically and rotatably connected to one end of the feed hopper (200) near the discharge port by a torsion spring.

Images