Sand and stone screening device for municipal construction

Abstract

The application discloses a sand and stone screening device for municipal construction and relates to the technical field of sand and stone screening. The sand and stone screening device comprises a base, a device shell is fixedly installed on the top outer wall of the base, an opening is formed in the top end of the device shell, a feeding hopper which is in communication with the inside of the device shell is arranged on the top end of the device shell, a wrinkle film is fixedly connected between the two sides of the end close to the bottom of the feeding hopper and the opening, and the sand and stone screening device further comprises a feeding assembly, a screening assembly and a driving assembly. The feeding assembly comprises a cavity column which is rotatably installed on the feeding hopper, and a discharging cavity roller is fixedly arranged on the outside of the cavity column. The feeding hopper can be moved back and forth, so that the range of feeding is improved, the discharging is avoided to be concentrated, and the screening effect of the device is ensured. When the cavity column and the discharging cavity roller rotate, the material is wrapped and carried downward by the fixed discharging sink, so that the feeding speed of the material is effectively slowed down, the feeding is avoided to be too fast, and the screening effect of the screening assembly is avoided to be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sand and gravel screening, and particularly relates to a sand and gravel screening device for municipal construction. BACKGROUND

[0002] The purpose of sand and gravel screening is to classify sand and gravel according to size to meet different engineering requirements. The size and shape of sand and gravel affect its physical properties, such as strength, stability, water permeability, etc., which are very important in the fields of building, road construction, bridge construction, etc. Through screening, sand and gravel of different particle sizes can be obtained to meet different engineering requirements. In addition, screening can also help improve the quality of sand and gravel.

[0003] According to the search, a sand and gravel screening device for construction is disclosed in Chinese Patent No. CN218531657U, which comprises a main body box, a feed inlet is formed in the top of the main body box, a discharge outlet is formed in the bottom of the main body box, a first motor and a second motor are fixedly installed on the side surface of the main body box, the first motor is located above the second motor, the output shaft of the first motor penetrates the main body box and is fixedly connected with a stirring column, a plurality of uniformly distributed stirring rods are fixedly installed on the surface of the stirring column, a first filter screen in an inclined state is fixedly installed in the inner cavity of the main body box below the stirring column, the output shaft of the second motor penetrates the main body box and is fixedly connected with a turntable, the turntable is fixedly connected with a link block, and the link block is fixedly connected with a link rod at the bottom.

[0004] However, the above-mentioned application has the following disadvantages: in the above-mentioned patent, the material is directly added through the feed inlet, but in actual operation, due to the fixed position of the feed inlet, the material will be added in a concentrated manner, in addition, the material lacks a slow-release design, and the material will quickly fall into the device, which will easily cause the material to be discharged from the gap without being screened, thereby reducing the screening quality, and thus having great limitations. SUMMARY

[0005] The purpose of the present application is to provide a sand and gravel screening device for municipal construction to solve the problems raised in the background art.

[0006] The technical solution of the present application is: a sand and gravel screening device for municipal construction, comprising a base, a device housing is fixedly installed on the top outer wall of the base, an opening is formed in the top end of the device housing, and a feeding hopper is provided at the top end of the device housing and communicates with the inside thereof, a pleated membrane is fixedly connected between the two sides of the end of the feeding hopper close to the bottom and the opening, and the device further comprises a feeding assembly, a screening assembly and a driving assembly.

[0007] The feeding assembly comprises a cavity column rotatably mounted on the feeding hopper, and a discharging cavity roller fixedly arranged outside the cavity column, a plurality of inner supporting plates fixedly connected between the inner wall of the discharging cavity roller and the cavity column, and a plurality of discharging grooves equidistantly arranged on the outer peripheral wall of the discharging cavity roller.

[0008] The screening assembly comprises a screening plate arranged inside the device shell, a slag discharge port formed in one side of the device shell, a slag discharge baffle hingedly connected to the top inner wall of the slag discharge port, a rubber film one fixedly connected between the side of the screening plate close to the slag discharge baffle and the inner wall of the device shell, and a rubber film two fixedly connected between the other side of the screening plate and the inner wall of the device shell.

[0009] The bottom outer wall of the feeding hopper is fixedly provided with side plates on both sides, a plurality of strip-shaped cavities equidistantly arranged in each side plate, a cleaning rod slidingly arranged in each strip-shaped cavity, and a connecting spring one fixedly connected between the top end of the cleaning rod and the top inner wall of the strip-shaped cavity.

[0010] Preferably, an installation cavity one is formed in the side plate close to the top end, and an electromagnetic plate is fixedly arranged in the installation cavity one; an installation cavity two is formed in the top end of each cleaning rod, and a magnetic block is fixedly arranged in the installation cavity two.

[0011] Preferably, the driving assembly comprises an installation side frame fixedly arranged on one side of the device shell, and a hydraulic rod one fixedly connected between the installation side frame and the feeding hopper, a bracket fixedly arranged on the hydraulic rod one, and the bottom of the bracket fixedly connected with the device shell and the installation side frame.

[0012] Preferably, rail groove frames are fixedly arranged on both sides of the top end of the device shell, guide frame blocks are fixedly arranged on the outer walls of both sides of the feeding hopper, the guide frame blocks slidingly connected with the rail groove frames, a rack fixedly arranged on both sides of the top end of the device shell, and gears fixedly arranged on both ends of the cavity column and engaged with the rack.

[0013] Preferably, a limiting slot rod is fixedly arranged on the top outer wall of the device shell, a supporting bracket slidingly arranged in the limiting slot rod, and a connecting pipe fixedly arranged in the supporting bracket.

[0014] Preferably, one end of the connecting pipe is rotatably connected with the cavity column, the other end of the connecting pipe fixedly communicated with a negative pressure hose, and the other end of the negative pressure hose fixedly communicated with an external dust removal equipment.

[0015] Preferably, a plurality of negative pressure pipes equidistantly arranged and fixedly communicated between the cavity column and the discharging cavity roller, a ring piece fixedly arranged in each negative pressure pipe, a connecting spring two fixedly arranged on one side of the ring piece, and an arc head counterweight block slidingly matched with the negative pressure pipe fixedly arranged at the end of the connecting spring two.

[0016] Preferably, each of the arc head counterweight blocks is provided with a dust suction hole, and the dust suction hole is in a whole "T" type structure.

[0017] Preferably, the installation inclined plate is fixedly installed on one side of the inner wall of the device shell close to the residue discharge baffle, and the installation block is fixedly installed on the other side of the inner wall of the device shell, the hydraulic rod two is fixedly installed on the top of the installation block, the movable inclined plate is fixedly installed on the extension end of the hydraulic rod two, the movable inclined plate is slidably connected with the inner wall of the device shell, a plurality of vibration springs two are fixedly installed between the top of the movable inclined plate and the installation inclined plate and the screening plate, and the vibration motor is fixedly installed on the bottom outer wall of the screening plate.

[0018] Preferably, the discharge port is formed in one side of the device shell, and the discharging plate is rotatably installed on the side of the inner wall of the device shell away from the discharge port through a movable shaft, and a plurality of vibration springs one are fixedly installed between the bottom inner wall of the discharge port and the discharging plate.

[0019] The sand and gravel screening device for municipal construction is provided by improving the prior art, and has the following improvements and advantages compared with the prior art.

[0020] Firstly, the feeding hopper can move back and forth, so that the feeding range is improved, the material is prevented from falling in a concentrated manner, and the screening effect of the device is ensured; when the cavity column and the discharging cavity roller rotate, the material is wrapped and carried downward by the set discharging sink, so that the feeding speed of the material is effectively slowed down, and the screening effect of the screening assembly is prevented from being reduced due to too fast feeding.

[0021] Secondly, the screening plate is set, which can vibrate when cooperating with the subsequent vibration motor, so that the screening plate can screen the material, and the rubber film one and the rubber film two are set, which can prevent the material from falling through the gap between the screening plate and the device shell, and ensure the screening effect.

[0022] Thirdly, when the feeding hopper moves back and forth, the two side plates can be driven to move synchronously, and the cleaning rod can be set to stir the material on the surface of the screening plate, so that the material can be evenly laid on the surface, and the screening effect is further improved; when the large particle impurities screened out by the screening plate need to be discharged, the electromagnetic plate can be controlled to start, and the cleaning rod can be retracted into the strip-shaped cavity opening by mutual adsorption with the magnetic block, so that the cleaning rod does not hinder the discharge of the large particle impurities, and the large particle impurities can quickly pass through the residue discharge baffle after the screening plate is inclined. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0024] Figure 1 It is a whole first perspective view of the structure of the present application.

[0025] Figure 2 It is a whole second perspective view of the structure of the present application.

[0026] Figure 3 It is a whole second perspective view of the structure of the present application. Figure 1 It is an enlarged structure diagram of A in the middle.

[0027] Figure 4 It is a partial cutaway structure diagram of the device shell of the present application.

[0028] Figure 5 It is a perspective view of the screening plate of the present application.

[0029] Figure 6 It is a perspective view of the downfeed roller of the present application.

[0030] Figure 7 It is a partial plane structure diagram of the side plate of the present application.

[0031] Figure 8 It is a cutaway structure diagram of the downfeed roller of the present application.

[0032] Reference signs:

[0033] 1, base; 2, device shell; 3, downfeed plate; 301, vibration spring one; 302, discharge port; 4, mounting side frame; 401, hydraulic rod one; 402, bracket; 5, feeding hopper; 501, guide frame block; 6, rail groove frame; 7, rack; 701, gear; 8, side plate; 801, cleaning rod; 802, magnetic block; 803, electromagnetic plate; 804, connecting spring one; 805, strip-shaped cavity; 9, cavity column; 901, downfeed roller; 902, downfeed sink; 10, screening plate; 11, vibration motor; 12, limiting groove rod; 13, support plate; 14, connecting pipe; 15, negative pressure hose; 16, slag discharge baffle; 17, rubber film one; 18, rubber film two; 19, mounting inclined plate; 20, movable inclined plate; 21, vibration spring two; 22, mounting block; 23, hydraulic rod two; 24, inner support plate; 25, negative pressure pipe; 26, ring piece; 27, connecting spring two; 28, arc head counterweight block; 29, dust suction hole; 30, pleated film. DETAILED DESCRIPTION

[0034] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] This invention provides an improved sand and gravel screening device for municipal construction. The technical solution of this invention is as follows:

[0036] like Figures 1 to 8 As shown, this embodiment of the invention provides a sand and gravel screening device for municipal construction, including a base 1. A device housing 2 is fixedly installed on the top outer wall of the base 1. The top of the device housing 2 has an opening, and a feeding hopper 5 communicating with the inside of the device housing 2 is provided at the top of the device housing 2. A pleated membrane 30 is fixedly connected between the two sides of the feeding hopper 5 near the bottom and the opening. The pleated membrane 30 can utilize its extensibility to adapt to the back-and-forth movement of the feeding hopper 5 and ensure the sealing between the outside of the feeding hopper 5 and the device housing 2. The device also includes a feeding component, a screening component, and a driving component. The driving component is used to drive the feeding hopper 5 to move back and forth, thereby increasing the feeding range and avoiding concentrated material drop, so as to ensure the screening effect of the device.

[0037] The feeding assembly includes a cavity column 9 rotatably mounted on the feeding hopper 5, and a feeding cavity roller 901 is fixedly installed on the outer side of the cavity column 9. Multiple inner support plates 24 are fixedly connected between the inner wall of the feeding cavity roller 901 and the cavity column 9. Multiple feeding troughs 902 are provided on the outer peripheral wall of the feeding cavity roller 901 at equal intervals. With the above structure, when the cavity column 9 and the feeding cavity roller 901 rotate, the feeding troughs 902 will use a fixed frequency to carry the material and scatter it downwards, thereby effectively slowing down the feeding speed of the material and avoiding feeding too fast, which would reduce the screening effect of the screening assembly.

[0038] The screening assembly includes a screening plate 10 disposed inside the device housing 2, and a slag outlet is provided on one side of the device housing 2. A slag discharge baffle 16 is hinged to the top inner wall of the slag outlet. A rubber diaphragm 17 is fixedly connected between the side of the screening plate 10 near the slag discharge baffle 16 and the inner wall of the device housing 2, and a rubber diaphragm 18 is fixedly connected between the other side of the screening plate 10 and the inner wall of the device housing 2. The screening plate 10, in conjunction with the subsequent vibration motor 11, can vibrate during operation to achieve material screening. At the same time, the rubber diaphragm 17 and the rubber diaphragm 18 prevent material from falling through the gap between the screening plate 10 and the device housing 2, ensuring screening effect.

[0039] The outer wall of the bottom of the feeding hopper 5 is fixedly provided with side plates 8 on both sides, and a plurality of strip-shaped cavities 805 are arranged at equal distances in each side plate 8, and a cleaning rod 801 is slidably arranged in each strip-shaped cavity 805, and a connecting spring 804 is fixedly connected between the top end of the cleaning rod 801 and the inner wall of the top of the strip-shaped cavity 805.

[0040] As a further scheme of the present application, the side plate 8 is provided with an installation cavity one near one end of the top, and an electromagnetic plate 803 is fixedly arranged in the installation cavity one, and the cleaning rod 801 is provided with an installation cavity two near one end of the top, and a magnetic block 802 is fixedly arranged in the installation cavity two; when the large particle impurities screened out by the screening plate 10 need to be discharged, the electromagnetic plate 803 can be controlled to start, and the magnetic block 802 is used to be adsorbed with each other, so that the cleaning rod 801 is retracted into the strip-shaped cavity 805, so as to avoid the hindering of the cleaning rod 801 to the discharge of the large particle impurities, so that the large particle impurities can quickly pass through the slag discharge baffle 16 after the screening plate 10 is inclined.

[0041] Further, the driving assembly comprises an installation side frame 4 fixedly arranged on one side of the device shell 2, and a hydraulic rod one 401 is fixedly connected between the installation side frame 4 and the feeding hopper 5, a bracket 402 is fixedly arranged on the hydraulic rod one 401, and the bottom of the bracket 402 is fixedly connected with the device shell 2 and the installation side frame 4; through the above structure, the feeding hopper 5 can be driven to move back by using the hydraulic rod one 401.

[0042] Further, the top of the device shell 2 is fixedly provided with a rail groove frame 6 on both sides, and the outer wall of both sides of the feeding hopper 5 is fixedly provided with a guide frame block 501, the guide frame block 501 is slidably connected with the rail groove frame 6, the top of the device shell 2 is fixedly provided with a rack 7 on both sides, and the both ends of the cavity column 9 are fixedly provided with a gear 701 meshing with the rack 7; through the above structure, when the feeding hopper 5 moves, the gears 701 at both ends of the cavity column 9 rotate under the meshing action of the rack 7, thereby driving the cavity column 9 to move.

[0043] As a further scheme of the present application, the top of the device shell 2 is fixedly provided with a limiting slot rod 12, and a supporting plate 13 is slidably arranged in the limiting slot rod 12, and a connecting pipe 14 is fixedly arranged in the supporting plate 13.

[0044] Further, the connecting pipe 14 is rotatably connected with one end of the cavity column 9, and the other end of the connecting pipe 14 is fixedly communicated with a negative pressure hose 15, and the other end of the negative pressure hose 15 is fixedly communicated with an external dust removal equipment; through the above structure, when the screening operation is carried out, a lot of dust will be generated in the inside of the device shell 2, at this time, the external dust removal equipment can be used to cooperate with the negative pressure hose 15 to generate negative pressure, and the inside of the cavity column 9 is in a negative pressure state.

[0045] Further, a plurality of negative pressure pipes 25 distributed at equal distances are fixedly communicated between the cavity column 9 and the discharging cavity roller 901, and ring pieces 26 are fixedly installed in the negative pressure pipes 25, and connecting springs two 27 are fixedly installed on one side of the ring pieces 26, and arc head counterweight blocks 28 in sliding cooperation with the negative pressure pipes 25 are fixedly installed at the end portions of the connecting springs two 27.

[0046] Further, the arc head counterweight block 28 is provided with a dust suction hole 29, and the dust suction hole 29 is in a whole "T" type structure.

[0047] Through the above structure, when the arc head counterweight block 28 moves to directly below when the discharging cavity roller 901 rotates, the end portion can be stretched out of the negative pressure pipe 25 under the action of gravity, so that the dust in the inside of the device shell 2 can be extracted by using the set dust suction hole 29, so as to achieve the purpose of energy saving and environmental protection.

[0048] Further, the installation inclined plate 19 is fixedly installed on the inner wall of the device shell 2 close to the residue discharging baffle 16, and the installation block 22 is fixedly installed on the other side of the inner wall of the device shell 2, the hydraulic rod two 23 is fixedly installed on the top of the installation block 22, the movable inclined plate 20 is fixedly installed at the extension end of the hydraulic rod two 23, the movable inclined plate 20 is in sliding connection with the inner wall of the device shell 2, a plurality of vibration springs two 21 are fixedly installed between the top of the movable inclined plate 20 and the installation inclined plate 19 and the screening plate 10, and the vibration motor 11 is fixedly installed on the bottom outer wall of the screening plate 10; through the above structure, when the vibration motor 11 is controlled to start, the vibration spring two 21 can be used to drive the screening plate 10 to vibrate, so as to improve the screening effect; when the hydraulic rod two 23 is controlled to start, the screening plate 10 can be pushed to flip upward, so that the large particle impurities fall from the screening plate 10, and when the residue discharging baffle 16 is pulled, the large particle impurities can be quickly discharged from the residue discharging port.

[0049] Further, the discharge port 302 is formed on one side of the device shell 2, the discharging plate 3 is rotatably installed on the inner wall of the device shell 2 away from the discharge port 302 through a movable shaft, and a plurality of vibration springs one 301 distributed at equal distances are fixedly installed between the bottom inner wall of the discharge port 302 and the discharging plate 3; through the above structure, when the screened material falls on the surface of the discharging plate 3, the vibration spring one 301 can be used to make the discharging plate 3 vibrate, so as to promote the discharging operation.

[0050] The specific working method is: when using, the sand and stone materials are put into the feeding hopper 5, after completion, the hydraulic rod one 401 is used to drive the feeding hopper 5 to move back, when the feeding hopper 5 moves, the gear 701 at both ends of the cavity column 9 rotates under the meshing action with the rack 7, and then drives the cavity column 9 to move; the feeding hopper 5 moves back and forth, which can improve the range of feeding, avoid the concentration of feeding, and ensure the screening effect of the device; when the cavity column 9 and the discharging cavity roller 901 rotate, the material is wrapped and falls downward by the setting of the discharging sink 902, so as to effectively slow down the feeding speed of the material, avoid the feeding too fast, and cause the screening effect of the screening assembly to decline;

[0051] By setting the screening plate 10, when running, the screening plate 10 is vibrated by cooperating with the vibration motor 11, so as to realize the screening of the material, and the rubber film one 17 and the rubber film two 18 are used to avoid the material falling from the gap between the screening plate 10 and the device shell 2, so as to ensure the screening effect; when the feeding hopper 5 moves back and forth, the two side plates 8 are driven to move synchronously, and the cleaning rod 801 is set to stir the material on the surface of the screening plate 10, so that the material is evenly laid on the surface, so as to further improve the screening effect;

[0052] When the large particle impurities screened out by the screening plate 10 need to be discharged, the electromagnetic plate 803 can be controlled to start, and the cleaning rod 801 is retracted into the strip-shaped cavity opening 805 by mutual adsorption with the magnetic block 802, so as to avoid the hindering of the cleaning rod 801 to the discharge of the large particle impurities; the hydraulic rod two 23 is controlled to start, the screening plate 10 is pushed to flip upward, so that the large particle impurities fall from the screening plate 10, and when the discharging baffle 16 is pulled, the large particle impurities are quickly discharged from the discharging port;

[0053] When the screening operation is performed, a lot of dust will be generated in the inside of the device shell 2, at this time, the external dust removal equipment is used to cooperate with the negative pressure hose 15 to generate negative pressure, and the inside of the cavity column 9 is in a negative pressure state; when the discharging cavity roller 901 rotates, the arc head counterweight 28 moves to the directly below, and the end part extends from the negative pressure pipe 25 under the action of gravity, so that the dust in the inside of the device shell 2 is sucked and removed by the setting of the dust suction hole 29, so as to achieve the purpose of energy saving and environmental protection; when the screened material falls on the surface of the discharging plate 3, the discharging plate 3 is vibrated by cooperating with the vibration spring one 301, so as to promote the discharging operation.

[0054] The foregoing description enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A municipal construction sand and gravel screening device, comprising a base (1), the top outer wall of the base (1) is fixedly installed with a device shell (2), the top end of the device shell (2) is provided with an opening, and the top end of the device shell (2) is provided with a feeding hopper (5) which is in communication with the inside of the device shell (2), the two sides of the end close to the bottom of the feeding hopper (5) are fixedly connected with a pleated film (30) between the opening, characterized in that, It also includes feeding assembly, screening assembly and driving assembly; The feeding assembly includes a cavity column (9) rotatably installed on the feeding hopper (5), and a discharging cavity roller (901) is fixedly arranged outside the cavity column (9), a plurality of inner supporting plates (24) are fixedly connected between the inner wall of the discharging cavity roller (901) and the cavity column (9), and a plurality of discharging sink grooves (902) are arranged on the outer peripheral wall of the discharging cavity roller (901) at equal distances. The screening assembly includes a screening plate (10) arranged inside the device housing (2), and a slag discharge port is formed in one side of the device housing (2), a slag discharge baffle (16) is hingedly connected to the top inner wall of the slag discharge port, a rubber film one (17) is fixedly connected between the side of the screening plate (10) close to the slag discharge baffle (16) and the inner wall of the device housing (2), and a rubber film two (18) is fixedly connected between the other side of the screening plate (10) and the inner wall of the device housing (2). The bottom outer wall of the feeding hopper (5) is fixedly installed with side plates (8) on both sides, a plurality of strip-shaped cavity openings (805) are formed in each side plate (8) at equal distances, a cleaning rod (801) is slidably installed in each strip-shaped cavity opening (805), a connecting spring one (804) is fixedly connected between the top end of the cleaning rod (801) and the top inner wall of the strip-shaped cavity opening (805), a plurality of negative pressure pipes (25) are fixedly and communicatively connected between the cavity column (9) and the discharging cavity roller (901) at equal distances, a ring piece (26) is fixedly installed in each negative pressure pipe (25), a connecting spring two (27) is fixedly installed on one side of the ring piece (26), and an arc head counterweight block (28) slidably matched with the negative pressure pipe (25) is fixedly installed at the end of the connecting spring two (27), a dust suction hole (29) is formed in each arc head counterweight block (28), and the dust suction hole (29) has a whole "T" type structure.

2. The sand and gravel screening device for municipal construction according to claim 1, characterized in that: An installation cavity one is formed in one end of the side plate (8) close to the top, and an electromagnetic plate (803) is fixedly installed in the installation cavity one, an installation cavity two is formed in one end of each cleaning rod (801) close to the top, and a magnetic block (802) is fixedly installed in the installation cavity two.

3. The sand and gravel screening device for municipal construction according to claim 1, characterized in that: The driving assembly includes an installation side frame (4) fixedly installed on one side of the device housing (2), and a hydraulic rod one (401) is fixedly and jointly connected between the installation side frame (4) and the feeding hopper (5), a bracket (402) is fixedly installed on the hydraulic rod one (401), and the bottom of the bracket (402) is fixedly connected with the device housing (2) and the installation side frame (4).

4. The sand and gravel screening device for municipal construction according to claim 3, characterized in that: The top ends of the device housing (2) are fixedly installed with rail groove frames (6) on both sides, the outer walls of the feeding hopper (5) are fixedly installed with guide frame blocks (501) on both sides, the guide frame blocks (501) are slidably connected with the rail groove frames (6), the top ends of the device housing (2) are fixedly installed with racks (7) on both sides, and gears (701) meshing with the racks (7) are fixedly installed at both ends of the cavity column (9).

5. The sand and gravel screening device for municipal construction according to claim 1, characterized in that: The top outer wall of the device shell (2) is fixedly provided with a limiting slot rod (12), and a supporting plate (13) is slidably arranged in the limiting slot rod (12).

6. The sand and gravel screening device for municipal construction according to claim 5, characterized in that: The connecting pipe (14) is rotatably connected with one end of the cavity column (9), and the other end of the connecting pipe (14) is fixedly communicated with a negative pressure hose (15), and the other end of the negative pressure hose (15) is fixedly communicated with an external dust removal device.

7. The sand and gravel screening device for municipal construction according to claim 1, characterized in that: The inner wall of the device shell (2) is fixedly provided with a mounting inclined plate (19) on one side close to the slag discharging baffle (16), and the inner wall of the device shell (2) is fixedly provided with a mounting block (22) on the other side, the top of the mounting block (22) is fixedly provided with a hydraulic rod two (23), and the extending end of the hydraulic rod two (23) is fixedly provided with a movable inclined plate (20), the movable inclined plate (20) is slidably connected with the inner wall of the device shell (2), a plurality of vibration springs two (21) are fixedly arranged between the top of the movable inclined plate (20) and the mounting inclined plate (19) and the screening plate (10), and the bottom outer wall of the screening plate (10) is fixedly provided with a vibration motor (11).

8. The sand and gravel screening device for municipal construction according to claim 1, characterized in that: One side of the device shell (2) is provided with a discharge port (302), and the inner wall of the device shell (2) is rotatably provided with a discharging plate (3) away from the discharge port (302) through a movable shaft, and a plurality of vibration springs one (301) are fixedly arranged between the bottom inner wall of the discharge port (302) and the discharging plate (3).

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