Sand screening device for municipal engineering construction

Abstract

The utility model discloses a sand screening device for municipal engineering construction, and relates to the technical field of sand screening devices. The sand screening machine comprises a supporting base, a sand screening machine box body is arranged on the upper side of the supporting base, a feeding port and an air inlet are formed in one side of the sand screening machine box body, a plurality of fans are arranged in the air inlet, a first impurity discharging port and a second impurity discharging port are formed in the side, away from the feeding port, of the sand screening machine box body, and a sand discharging pipe is arranged on the lower side of the sand screening machine box body. A sieve plate is rotationally matched between the two sides of the inner wall of the sand screening machine box, and an electric push rod is rotationally matched with one side of the inner wall of the sand screening machine box. The electric push rod stretches out and draws back so that the sieve plate can be conveniently pushed to rotate and incline, and therefore impurities can slide out of the first impurity discharging port and make contact with the upper side of the first impurity discharging port when sand is screened through the sieve plate, and the probability that sand meeting the size slides out of the first impurity discharging port is reduced; and the probability that the screened sand is discharged from the impurity discharging opening I is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sand screening device field, and concretely relates to a sand screening device for municipal engineering construction. BACKGROUND

[0002] The sand screening device is a kind of sand mine machinery using screening equipment to separate coarse and fine materials.

[0003] The Chinese patent with publication number CN220346485U discloses a high-efficiency sand screening device for municipal engineering construction, which comprises an intermediate partition plate arranged inside a machine body shell, an impurity discharge hole arranged at the lower left end of the machine body shell, an inlet hole arranged at the upper right end of the machine body shell, a fan hole arranged below the inlet hole on the machine body shell, and a screening plate arranged at the right side between the intermediate partition plate and the machine body shell.

[0004] However, when the sand screening device disclosed in the application is in use, the pretreated sand falling through the screening plate can slide and roll towards the intermediate partition plate, and the impurities left after screening can be discharged to the outside through the intermediate partition plate and the impurity discharge hole. However, when the pretreated sand accumulates, the sand that is not screened in time can pass through the intermediate partition plate along with the impurities and be discharged on the other side. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a sand screening device for municipal engineering construction to solve the problems raised in the background.

[0006] To solve the above technical problems, the basic concept of the technical solution of the utility model is as follows:

[0007] A sand screening device for municipal engineering construction comprises a support base, a sand screening machine box body arranged on the upper side of the support base, an inlet and an air inlet arranged on one side of the sand screening machine box body, the inlet being arranged above the air inlet, a plurality of fans being arranged in the air inlet, impurity discharge ports one and two being arranged on the side of the sand screening machine box body away from the inlet, the impurity discharge port two being arranged above the impurity discharge port one, and a sand discharge pipe being arranged on the lower side of the sand screening machine box body.

[0008] A screening plate is rotatably arranged between the inner walls of the sand screening machine box body, the screening plate is in contact with the upper side of the impurity discharge port one, an electric push rod is rotatably arranged on one side of the inner wall of the sand screening machine box body, the output shaft of the electric push rod is rotatably arranged on the lower side of the screening plate, a support plate is arranged on the inner wall of the sand screening machine box body away from the inlet, an elastic plate is elastically arranged on the support plate, a circular arc plate is arranged on the upper side of the elastic plate, and the circular arc plate is arranged below the screening plate.

[0009] Optionally, the upper side of the support plate is provided with two vertical rods and two springs, the spring is sleeved on the peripheral side of the vertical rod, the upper end of the spring is arranged on the lower side of the elastic plate, the elastic plate is vertically provided with two slot holes, the slot hole penetrates the elastic plate, and the top of the vertical rod is located in the corresponding slot hole.

[0010] Optionally, the upper end surface of the electric push rod output shaft is provided with a semicircle block one, the lower side of the sieve plate is provided with two fixed plates one, the two fixed plates one are provided with a horizontal rod one, the semicircle block one is rotationally matched on the peripheral side of the horizontal rod one, the lower end surface of the electric push rod is provided with a semicircle block two, the inner wall of the sand screening machine box is provided with two fixed plates two on one side, the two fixed plates two are provided with a horizontal rod two, and the semicircle block two is rotationally matched on the peripheral side of the horizontal rod two.

[0011] Optionally, the lower side of the sieve plate is provided with a motor one, the output shaft of the motor one penetrates the sieve plate vertically, the output shaft of the motor one is fixedly connected with a circular plate, and the side of the circular plate is symmetrically provided with two scrapers.

[0012] Optionally, the inner walls of the sand screening machine box are provided with shaft rods on both sides, and the sieve plate is provided with through holes two on both sides.

[0013] Optionally, the inner walls of the sand screening machine box are provided with connecting plates one on both sides, the connecting plates one penetrate the feeding port, two roller ones are rotationally matched between the two connecting plates one, a conveying belt one is sleeved on the peripheral side of the two roller ones, a plurality of partitions are arranged on the outer wall of the conveying belt one, the partitions are located between the two connecting plates one, the sand screening machine box and one side of one of the connecting plates one are provided with two motors two, the output shaft of the motor two is fixedly connected with a support rod one, the support rod one penetrates the two connecting plates one transversely, the two roller ones are arranged on the peripheral side of the corresponding support rod one, and the opposite outer sides of the two connecting plates one are provided with support legs one.

[0014] Optionally, the support base comprises a bottom plate arranged on the lower side of the sand screening machine box, the bottom plate is vertically provided with a slot, the slot penetrates the bottom plate, the sand discharging pipe penetrates the slot, and the lower side of the bottom plate is provided with four support legs two, which are symmetrically distributed on both sides of the sand discharging pipe.

[0015] Optionally, one side of the two adjacent support legs two is provided with a connecting plate two, two roller twos are rotationally matched between the two connecting plates two, a conveying belt two is sleeved on the peripheral side of the two roller twos, one side of one of the connecting plates two is provided with two motors three, the output shaft of the motor three is fixedly connected with a support rod two, the support rod two penetrates the two connecting plates two transversely, and the two roller twos are arranged on the peripheral side of the corresponding support rod two.

[0016] Optionally, the sand screening machine box is provided with an inclined plate on the side of the inner wall away from the air inlet, the inclined plate is arranged between the two sides of the inner wall of the sand screening machine box, the sieve plate is located between the inclined plate and the circular arc plate, the lower part of the inclined plate is located below the impurity discharge port two, and the sand screening machine box is provided with an impurity discharge pipe on one side, and the impurity discharge pipe is located on the side of the impurity discharge port one and the impurity discharge port two.

[0017] After the technical scheme is applied, the utility model has the following beneficial effects compared with the prior art, of course, any product implementing the utility model does not necessarily need to achieve all the advantages described below:

[0018] The impurities can slide out of the impurity discharge port one, the sieve plate is in contact with the upper side of the impurity discharge port one during sand screening, the probability of the sand meeting the size sliding out of the impurity discharge port one is reduced, the sieve plate is in elastic sliding contact with the elastic plate, the probability of the sand after screening being discharged from the impurity discharge port one is reduced, the circular arc plate reduces the friction between the sieve plate and the elastic plate during rotation of the sieve plate, the smoothness of the sieve plate during rotation is improved, and the fan blows out the fine impurities.

[0019] The specific embodiments of the utility model will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings:

[0021] Figure 1 It is a three-dimensional structure schematic view of the sand screening device;

[0022] Figure 2 It is a sectional structure schematic view of the sand screening device;

[0023] Figure 3 It is a structure schematic view of the pushing assembly;

[0024] Figure 4 It is a structure schematic view of the circular arc plate and the elastic plate;

[0025] Figure 5 It is a sectional structure schematic view of the transmission belt two;

[0026] Figure 6 It is a structure schematic view of the scraper.

[0027] In the drawings, the component list represented by each sign is as follows:

[0028] Sand screening machine box 1, connecting plate 2, bottom plate 3, impurity discharge pipe 4, support leg 5, connecting plate 6, conveying belt 7, conveying belt 8, partition plate 9, support leg 10, feed inlet 11, inclined plate 12, sieve plate 13, electric push rod 14, fan 15, shaft 16, motor 17, fixed plate 18, cross rod 19, fixed plate 20, cross rod 21, support plate 22, elastic plate 23, spring 24, vertical rod 25, support rod 26, roller 27, support rod 28, roller 29, sand discharge pipe 30, round plate 31, scraper 32.

[0029] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0032] Municipal engineering construction covers road laying, bridge building, drainage system construction and many other fields. Sand, as a key basic building material, its quality and particle size control plays a decisive role in the quality of the project. Sand that has not been screened or not finely screened may contain a large amount of impurities and large particles of gravel, which can cause problems such as insufficient concrete strength and poor road flatness. Therefore, an efficient and reliable sand screening device has become a necessary mechanical equipment on the site of municipal engineering construction. It not only ensures the quality of sand, but also improves the construction efficiency and reduces the labor cost.

[0033] The sand screening machine, also known as a dry land sand screening boat or a sand and gravel separator, is suitable for sand and gravel separation equipment in rivers, reservoirs and coal yards. It is composed of a hull, a shelf, a speed reducer, a conveyor belt, a rotating screen, an engine or a motor. This machine has simple structure, economy, easy operation. It is divided into drum type sand screening machine, water washing drum type sand screening machine, vibrating screen type sand screening machine, etc.

[0034] The sand screening machine has a wide range of application scenarios: mining industry: after mining, the ore needs to be separated from waste rock, soil and other impurities, the drum sand screening machine can screen according to the size of the ore particles, provide uniform particle size raw materials for the subsequent beneficiation process, improve the beneficiation efficiency and concentrate quality. For example, the primary selection of iron ore can effectively screen out a large amount of gangue, reducing the cost of subsequent processing.

[0035] Construction engineering: whether it is the construction of high-rise buildings or the construction of infrastructure such as roads and bridges, there are strict requirements for the quality of sand, gravel and other building materials. The drum sand screening machine can accurately screen out sand and gravel that meet the concrete mixing ratio, ensuring the strength of the building structure. For example, in the construction of large commercial buildings, in order to meet the demand for high-strength concrete, different specifications of gravel and pure sand are screened out.

[0036] Water conservancy project: when building water conservancy facilities such as dams and sluices, a large amount of high-quality sand and gravel is needed for concrete pouring and slope protection. The drum sand screening machine ensures that the sand and gravel used for the main body of the dam are free of large impurities, improving the impermeability and compression resistance of the dam; the stone used for slope protection is of moderate size after screening, which can effectively stabilize the embankment.

[0037] Glass manufacturing: glass production has very high requirements for the purity and particle size of quartz sand, the drum sand screening machine can finely screen out quartz sand that meets the process standards, remove impurity particles that may affect the transparency and quality of the glass, and ensure the optical performance and quality stability of the finished glass products.

[0038] Foundry industry: foundry sand needs to be within a specific particle size range, the drum sand screening machine can screen natural sand or artificial sand to the appropriate mesh size, providing high-quality sand for foundry mold making, ensuring smooth surface and accurate size of castings, reducing waste rate and improving casting production efficiency.

[0039] Garbage disposal: some municipal solid waste treatment plants use incineration power generation technology, and inert materials such as sand and gravel need to be screened out before incineration, the drum sand screening machine can quickly complete this separation task, avoid large inorganic particles from entering the incinerator and damaging the equipment, and ensure smooth garbage disposal process.

[0040] The sand screening machine plays a key role in the raw material pretreatment link of various industries with its stable and reliable performance, wide material adaptability and other characteristics, and helps various industries to produce efficiently.

[0041] During the use of the sand screening machine, some common faults may occur: screen clogging: this is a relatively frequent problem. When the sand has high water content and high viscosity, or contains a lot of fine powder and soil, it is easy to accumulate on the screen and block the screen holes. For example, in the rainy season, sand exposed to the air after being soaked into the sand screening machine is prone to cause large-area clogging of the screen, resulting in a sharp decrease in screening efficiency, or even complete inability to screen.

[0042] Vibration anomaly: for the vibrating sand screen, if the vibration motor fails, such as motor bearing wear, winding short circuit, etc., it will cause abnormal vibration frequency and amplitude. It shows that the vibration is uneven, and the sand screen shakes violently during operation, which not only affects the screening accuracy, but also may damage other parts of the equipment, such as the connecting spring breaks due to uneven force, further aggravating the degree of equipment failure.

[0043] Transmission component damage: the transmission system of the sand screening machine includes belt, speed reducer, chain wheel and other components. After a long time of operation, the belt may be loose, worn or broken, resulting in unstable or interrupted power transmission; if the speed reducer is not lubricated enough or overloads, it will cause gear wear and gluing, affecting the output of the equipment speed, so that the sand screening machine cannot work normally; under the condition of improper chain tension, the chain wheel is prone to tooth surface wear and tooth skipping.

[0044] Cleaning device failure: the cleaning device of some sand screening machines, such as high pressure air nozzle or mechanical beating device, will also cause problems if it fails. The high pressure air nozzle may not be able to effectively blow the screen due to insufficient air source pressure or nozzle blockage; the motor failure, eccentric wheel damage or beating rod deformation of the mechanical beating device will greatly reduce the cleaning function, leading to more serious screen clogging.

[0045] Poor discharge: the discharge system failure is often manifested as discharge port clogging or belt conveyor failure. The discharge port may be clogged due to sand arching and foreign matter sticking, so that the screened sand cannot be discharged smoothly, causing internal accumulation of the equipment; if the belt conveyor is off track or the roller is damaged, the sand will spill and cannot be accurately conveyed to the designated position, affecting the continuity of the whole sand screening process.

[0046] Please refer to Figures 1-6 In the embodiment, a sand screening device for municipal engineering construction is provided, which comprises a support base, a sand screening machine box body 1 is arranged on the upper side of the support base, a feeding port 11 and an air inlet are arranged on one side of the sand screening machine box body 1, the feeding port 11 is located above the air inlet, a plurality of fans 15 are arranged in the air inlet, impurity discharge ports one and two are arranged on the side of the sand screening machine box body 1 away from the feeding port 11, the impurity discharge port two is located above the impurity discharge port one, and a sand discharge pipe 30 is arranged on the lower side of the sand screening machine box body 1;

[0047] A sieve plate 13 is rotatably arranged between the inner walls of the sand screening machine box body 1, the sieve plate 13 is in contact with the upper side of the impurity discharge port one, an electric push rod 14 is rotatably arranged on one side of the inner wall of the sand screening machine box body 1, the output shaft of the electric push rod 14 is rotatably arranged on the lower side of the sieve plate 13, a support plate 22 is arranged on the inner wall of the sand screening machine box body 1 away from the feeding port 11, a resilient plate 23 is resiliently arranged on the support plate 22, a circular arc plate is arranged on the upper side of the resilient plate 23, and the circular arc plate is located below the sieve plate 13.

[0048] The application of one aspect of the embodiment is: in use, the pretreated sand is sent into the sand screening machine box 1 from the feed inlet 11, the fine impurities in the falling sand are blown out from the impurity discharge port two by the fan 15, the sand falls on the upper side of the sieve plate 13 for screening, the sand meeting the size is discharged from the sand discharge pipe 30, then the electric push rod 14 is extended to push the sieve plate 13 to rotate and tilt, at the same time, the sieve plate 13 rotates to extrude the arc plate and the elastic plate 23, so that the arc plate and the elastic plate 23 are forced to displace downward, and the impurities remaining on the upper side of the sieve plate 13 slide out from the impurity discharge port one, thereby completing the screening of the sand. It should be noted that all electrical equipment involved in the present application can be powered by a battery or an external power source.

[0049] The electric push rod 14 is telescopic to facilitate the rotation and tilting of the sieve plate 13, so that the impurities can slide out from the impurity discharge port one, the sieve plate 13 is in contact with the upper side of the impurity discharge port one during sand screening, which reduces the probability of sand meeting the size sliding out from the impurity discharge port one, the elastic plate 23 is elastically slid, which reduces the probability of sand after screening being discharged from the impurity discharge port one, the arc plate reduces the friction between the sieve plate 13 and the elastic plate 23 during rotation, which improves the smoothness of the sieve plate 13 during rotation, and the fan 15 facilitates blowing out the fine impurities.

[0050] As shown in Figure 4 , the upper side of the support plate 22 of the embodiment is provided with two vertical rods 25 and two springs 24, the spring 24 is sleeved on the side of the vertical rod 25, the upper end of the spring 24 is arranged on the lower side of the elastic plate 23, the elastic plate 23 is vertically provided with two slot holes, the slot hole penetrates the elastic plate 23, the top of the vertical rod 25 is located in the corresponding slot hole, the spring 24 facilitates the arc plate to keep in contact with the sieve plate 13, and the vertical rod 25 and the slot hole cooperate to reduce the probability of misplacement of the elastic plate 23 and the arc plate during downward displacement.

[0051] As shown in Figure 3 , the upper end surface of the output shaft of the electric push rod 14 of the embodiment is provided with a semicircle block one, the lower side of the sieve plate 13 is provided with two fixed plates one 18, the two fixed plates one 18 are provided with a horizontal rod one 19 therebetween, the semicircle block one is rotationally fitted on the side of the horizontal rod one 19, the lower end surface of the electric push rod 14 is provided with a semicircle block two, one side of the inner wall of the sand screening machine box 1 is provided with two fixed plates two 20, the two fixed plates two 20 are provided with a horizontal rod two 21 therebetween, the semicircle block two is rotationally fitted on the side of the horizontal rod two 21, the fixed plate one 18, the horizontal rod one 19 and the semicircle block one cooperate to facilitate the stable rotational connection of the output shaft of the electric push rod 14 and the sieve plate 13, which reduces the probability of the electric push rod 14 being blocked when pushing the sieve plate 13, the fixed plate two 20, the horizontal rod two 21 and the semicircle block two cooperate to facilitate the stable rotational connection of the electric push rod 14 and one side of the inner wall of the sand screening machine box 1, so that the electric push rod 14 can be angle-adjusted according to the extension length.

[0052] As Figure 6 shown, the lower side of the sieve plate 13 is provided with a motor 17, the output shaft of the motor 17 vertically penetrates the sieve plate 13, the output shaft of the motor 17 is fixedly connected with a circular plate 31, two scrapers 32 are symmetrically arranged on the side of the circular plate 31, the scrapers 32 are located on the upper side of the sieve plate 13, the circular plate 31 and the scrapers 32 are driven to rotate by the operation of the motor 17, the pretreated sand on the sieve plate 13 is stirred by the rotation of the scrapers 32, and the probability of clogging of the sieve plate 13 caused by the accumulation of the pretreated sand is reduced.

[0053] As Figure 2 shown, the two sides of the sand screening machine box 1 are provided with shaft rods 16, the two sides of the sieve plate 13 are provided with through holes 2, the shaft rods 16 are located in the through holes 2, the sieve plate 13 is supported by the shaft rods 16, and the sieve plate 13 is rotated along the shaft rods 16 by cooperating with the through holes 2.

[0054] As Figure 2 shown, the two sides of the sand screening machine box 1 are provided with connecting plates 2, the connecting plates 2 penetrate the feed inlet 11, two roller cylinders 27 are rotatably arranged between the two connecting plates 2, the two roller cylinders 27 are sleeved with a transmission belt 7, a plurality of partitions 9 are arranged on the outer wall of the transmission belt 7, the partitions 9 are located between the two connecting plates 2, the sand screening machine box 1 and one side of one of the connecting plates 2 are provided with a motor 2, the output shaft of the motor 2 is fixedly connected with a support rod 26, the support rod 26 transversely penetrates the two connecting plates 2, the two roller cylinders 27 are arranged on the corresponding sides of the support rod 26, the opposite outer sides of the two connecting plates 2 are provided with support legs 5, the roller cylinders 27 are supported by the connecting plates 2, the support rod 26 and the support legs 5, so as to support the transmission belt 7, the roller cylinders 27 and the transmission belt 7 are driven to rotate by the rotation of the output shaft of the motor 2, so as to convey the pretreated sand, the pretreated sand is conveyed into the sand screening machine box 1 by cooperating the transmission belt 7 with the partitions 9, the probability of the pretreated sand falling off from the transmission belt 7 is reduced, and the working intensity of the user is reduced.

[0055] As Figure 1 , 2 shown, the support base comprises a bottom plate 3 arranged on the lower side of the sand screening machine box 1, the bottom plate 3 is vertically provided with a slot, the slot penetrates the bottom plate 3, the sand discharge pipe 30 penetrates the slot, the lower side of the bottom plate 3 is provided with four support legs 10, the four support legs 10 are symmetrically arranged on the two sides of the sand discharge pipe 30, the sand screening machine box 1 is supported by cooperating the bottom plate 3 with the support legs 10, and the sand discharge pipe 30 penetrates the bottom plate 3 to discharge the screened sand by the slot.

[0056] As Figure 1 ,5 As shown, two connecting plates two 6 are arranged on one side of the two adjacent support legs two 10 of the embodiment, two roller drums two 29 are rotatably matched between the two connecting plates two 6, a transmission belt two 8 is sleeved on the circumferential side of the two roller drums two 29, one side of one of the connecting plates two 6 is provided with two motors three, the output shaft of the motor three is fixedly connected with a support rod two 28, the support rod two 28 transversely penetrates through the two connecting plates two 6, the two roller drums two 29 are arranged on the circumferential side of the corresponding support rod two 28 respectively, the roller drum two 29 and the transmission belt two 8 are supported through the cooperation of the connecting plate two 6 and the support rod two 28, the roller drum two 29 and the transmission belt two 8 are driven to rotate through the rotation of the output shaft of the motor three, the sand after screening is transported from below the discharge pipe 4 to the outside through the transmission belt two 8, and the convenience of collecting the sand after screening is improved.

[0057] As shown, Figure 2 As shown, the inclined plate 12 is arranged on the inner wall side away from the air inlet of the sand screening machine box 1, the inclined plate 12 is arranged between the two inner walls of the sand screening machine box 1, the sieve plate 13 is located between the inclined plate 12 and the circular arc plate, the lower part of the inclined plate 12 is located below the impurity discharge port two, the sand screening machine box 1 is provided with an impurity discharge pipe 4 on one side, and the impurity discharge pipe 4 is located on the circumferential side of the impurity discharge port one and the impurity discharge port two. The fine impurities blown by the wind are caught by the inclined plate 12, and the fine impurities slide along the inclined plate 12 to the impurity discharge port two. The impurities discharged from the impurity discharge port one and the impurity discharge port two are discharged from the impurity discharge pipe 4 through the cooperation of the impurity discharge port one, the impurity discharge port two and the impurity discharge pipe 4, and the convenience of collecting impurities by the user is improved.

[0058] The utility model is not limited to the above-mentioned embodiment, anyone should know that the structural change made under the inspiration of the utility model, any technical scheme with the same or similar technical scheme of the utility model falls into the protection scope of the utility model. The technical, shape and structure parts not described in detail in the utility model are known technology.

Claims

1. A sand screening device for civil engineering construction, characterized in that, The utility model relates to a sand screening machine, including: Supporting base, sand screening machine box body (1) are equipped on the upside of supporting base, sand screening machine box body (1) one side is equipped with feed inlet (11) and air inlet, air inlet is equipped with a plurality of fan (15) inside, sand screening machine box body (1) one side away from feed inlet (11) is equipped with impurity discharge port one and impurity discharge port two, sand screening machine box body (1) lower side is equipped with sand discharge pipe (30); Sand screening machine box body (1) inner wall both sides are rotatably equipped with sieve plate (13), sand screening machine box body (1) inner wall one side is rotatably equipped with electric push rod (14), electric push rod (14) output shaft top rotatably cooperates in the downside of sieve plate (13), sand screening machine box body (1) inner wall one side away from feed inlet (11) is equipped with support plate (22), support plate (22) is elastically equipped with elastic plate (23), and the upper side of elastic plate (23) is equipped with arc plate.

2. The sand screening device for municipal engineering construction according to claim 1, characterized in that, Support plate (22) upper side is equipped with two vertical rods (25) and two springs (24), and the lower side of elastic plate (23) is equipped with the upper end of spring (24), and the vertical of elastic plate (23) is equipped with two slot holes, and the top of vertical rod (25) is located in the corresponding slot hole.

3. The sand screening device for municipal engineering construction according to claim 1, characterized in that, The upper end surface of electric push rod (14) output shaft is equipped with semicircle block one, and the lower side of sieve plate (13) is equipped with two fixed plates (18), and the two fixed plates (18) are equipped with horizontal rod (19) between, and semicircle block one is rotatably cooperated in the circumferential side of horizontal rod (19), and the lower end surface of electric push rod (14) is equipped with semicircle block two, and the inner wall one side of sand screening machine box body (1) is equipped with two fixed plates (20), and the two fixed plates (20) are equipped with horizontal rod (21) between, and semicircle block two is rotatably cooperated in the circumferential side of horizontal rod (21).

4. The sand screening device for municipal engineering construction according to claim 1, characterized in that, The lower side of sieve plate (13) is equipped with motor (17), and the output shaft of motor (17) vertically penetrates sieve plate (13), and the output shaft of motor (17) is fixedly connected with round plate (31), and the side of round plate (31) is symmetrically equipped with two scrapers (32).

5. The sand screening device for municipal engineering construction according to claim 1, characterized in that, The inner wall both sides of sand screening machine box body (1) are equipped with shaft rod (16), and the both sides of sieve plate (13) are equipped with through hole two, and the shaft rod (16) is located in the through hole two.

6. The sand screening device for municipal engineering construction according to claim 1, characterized in that, The inner wall both sides of sand screening machine box body (1) are equipped with connecting plate (2), and the two connecting plates (2) are rotatably equipped with two roller (27) between, and the circumferential side of two roller (27) is sleeved with transmission belt (7), and the outer wall of transmission belt (7) is equipped with a plurality of partition plates (9), and the one side of sand screening machine box body (1) and one connecting plate (2) is equipped with motor (2), and the output shaft of motor (2) is fixedly connected with support rod (26), and two roller (27) are respectively equipped in the circumferential side of corresponding support rod (26).

7. The sand screening device for municipal engineering construction according to claim 1, characterized in that, Supporting base includes bottom plate (3) equipped in the lower side of sand screening machine box body (1), and the vertical of bottom plate (3) is equipped with slot, and sand discharge pipe (30) penetrates slot, and the lower side of bottom plate (3) is equipped with four support legs (10).

8. The sand screening device for municipal engineering construction according to claim 7, characterized in that, Two connecting plates two (6) are arranged on one side of two adjacent support legs two (10), two roller drums two (29) are rotatably connected between the two connecting plates two (6), a transmission belt two (8) is sleeved on the circumferential side of the two roller drums two (29), and one side of one of the connecting plates two (6) is provided with two motors three, the output shafts of the motors three are fixedly connected with support rods two (28), and the two roller drums two (29) are arranged on the circumferential side of the corresponding support rods two (28) respectively.

9. The sand screening device for municipal engineering construction according to claim 1, characterized in that, The sand screening machine box (1) is provided with an inclined plate (12) on the inner wall side away from the air inlet, and the sand screening machine box (1) is provided with an impurity discharge pipe (4) on one side.

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