CN112726770A - Drainage system with double-layer drainage grate - Google Patents

Abstract

The invention relates to a drainage system with a double-layer drainage grate. The power mechanism provides power for the transmission mechanism to drive the double-layer drainage grate to do relative shearing motion, and water and garbage sheared by the double-layer drainage grate are discharged into a sewer through the discharge mechanism; the double-layer drainage grate comprises a fixed ground drainage grate and a lower-layer drainage grate located below the ground drainage grate, the lower-layer drainage grate comprises a cylindrical drainage grate which is fixed on the same layer and opposite to the cylindrical drainage grate and a long-strip rectangular drainage grate, and the lower-layer drainage grate is driven by a transmission mechanism to do back and forth linear motion. The garbage is sheared by the relative shearing movement of the double-layer drainage grate, the garbage can be effectively removed, the problem of drainage blockage is solved, and the condition of sewer blockage of urban roads in rainy days can be improved.

Description

Drainage system with double-layer drainage grate

Technical Field

The invention relates to the field of ground drainage devices, in particular to a drainage grate structure of a drainage system.

Background

The drainage grate used in the market at present is processed and manufactured by using a cement material. Some are manufactured by processing a metal material such as iron. The application range of cement products is wider. The appearance can be processed according to the requirements, and the manufacture has stable practical performance and good relationship. Such as at the pool side of some square parks. Different water leakage holes are designed, for example, patent CN 201921242948.2. The products have stable performance and can meet the use requirements of more industries in the aspect of bearing. Not only in our daily lives. On tolls or in demanding environments such as airports. However, most of the mesh drainage grates are static symmetrical devices, and there are also swinging water grates such as patent CN201910097053.2, but the fault tolerance of the perforated water grate to the drained water quality still has a problem, and when turbid liquid, branches and sheet-shaped plastic products containing more fine particles are subjected to garbage accumulation and blockage to a certain extent, even the drainage pipeline is completely sealed in serious cases. This design is based on the problem that present drainage comb blockked up and is started, has solved rubbish to a certain extent and has piled up, block up the problem.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a drainage system capable of solving the problem of blockage of a drainage grate. In order to achieve the aim, the invention provides a drainage system with a double-layer drainage grate, which comprises the double-layer drainage grate, a transmission mechanism, a power mechanism and a drainage mechanism; the power mechanism is connected with the transmission mechanism, the transmission mechanism is connected with the double-layer drainage grate, the transmission mechanism drives the double-layer drainage grate to do relative shearing motion, and water and garbage sheared by the double-layer drainage grate are discharged into a sewer through the discharge mechanism; the double-layer drainage grate comprises a fixed ground drainage grate and a lower-layer drainage grate located below the ground drainage grate, the lower-layer drainage grate comprises a cylindrical drainage grate and a long-strip rectangular drainage grate which are fixed on the same layer and relatively, and the lower-layer drainage grate is driven by a transmission mechanism to move back and forth.

The garbage shearing machine provided by the invention can shear garbage by arranging the relative shearing motion of the double-layer drainage grate, effectively remove the garbage and solve the problem of drainage blockage.

As a further improvement of the drainage system with the double-layer drainage grate, the grid lines of the cylindrical drainage grate, the long-strip rectangular drainage grate and the ground drainage grate are all linear. In the process that the lower drainage grate is driven by the transmission mechanism to do reciprocating linear motion, the grid lines of the cylindrical drainage grate and the long rectangular drainage grate and the grid lines of the ground drainage grate do cross reciprocating motion, and the crossed grid lines can cut up hard objects such as branches.

As a further improvement of the drainage system with the double-layer drainage grate, the grid lines of the cylindrical drainage grate and the strip-shaped rectangular drainage grate are perpendicular to the grid lines of the ground drainage grate, and the lower drainage grate moves back and forth along the grid line direction of the ground drainage grate.

As a further improvement of the drainage system with the double-layer drainage grate, the grid lines of the cylindrical drainage grate and the long rectangular drainage grate are crossed with the grid lines of the ground drainage grate to form an angle of 60 degrees, and the lower drainage grate moves back and forth along the grid line direction of the ground drainage grate.

The vertical shearing motion and the shearing motion which is intersected at an angle of 60 degrees can effectively shear the garbage, and can also be set to be other intersected angles.

As a further improvement of the drainage system with the double-layer drainage grates, the double-layer drainage grates are arranged in a short distance, and the distance between the double-layer drainage grates is 0-10 cm. Further, the distance between the two layers can be set to be 1-10 cm or 3-5 cm, and a gap between the two layers is reserved to increase the water discharge.

As a further improvement of the drainage system with the double-layer drainage grate, the long rectangular drainage grate has sharp edges and is easy to shear garbage. And the shearing motion of cylindrical drainage grate relative to ground drainage grate also can cut up rubbish, also sees through rubbish easily, reduces rubbish and is detained. The cooperation of rectangular drainage double-edged fine-toothed comb and cylindrical drainage double-edged fine-toothed comb has improved the efficiency of refuse treatment.

As a further improvement of the drainage system with the double-layer drainage grate, the lower drainage grate is in a strip-shaped U-shaped groove structure, cylindrical drainage grates and strip-shaped rectangular drainage grates are fixedly arranged in the strip-shaped U-shaped groove at intervals, each cylindrical drainage grate is provided with a cylindrical grid line, each strip-shaped rectangular drainage grate is provided with a strip-shaped rectangular grid line, and the grid lines of the cylindrical drainage grates and the grid lines of the strip-shaped rectangular drainage grates are parallel to each other.

As a further improvement of the drainage system with the double-layer drainage grate, the outer side surface of the lower drainage grate is provided with a convex sliding block, the transmission mechanism is provided with a sliding groove, and the sliding block is embedded into the sliding groove; a tail end convex cylinder is arranged between the cylindrical drainage grate and the strip-shaped rectangular drainage grate in a U-shaped groove of the lower drainage grate, and the transmission mechanism drives the lower drainage grate to move back and forth along the sliding groove by driving the tail end convex cylinder.

As a further improvement of the drainage system with the double-layer drainage grate, the drainage system comprises an outer cover, and the ground drainage grate is fixedly arranged on the top surface of the outer cover; a fixed supporting plate is arranged in the outer cover; the lower drainage grate is arranged on the supporting plate.

As a further improvement of the drainage system with the double-layer drainage grate, a left large round hole, a middle square array small hole and a right large round hole are formed in the position, close to the side edge of the lower-layer drainage grate, of the supporting plate; water flows of the left large round hole and the right large round hole are led to the discharging mechanism, the discharging mechanism is provided with a garbage sorting device and a garbage penetrating device, and the garbage penetrating aperture is set to be 6-11 cm; the water flow with the square array holes is communicated with the power mechanism, and the mechanical energy of the water flow is transferred to the mechanical energy of the power mechanism.

The shearing motion of the cylindrical drainage grate and the strip-shaped rectangular drainage grate relative to the static ground drainage grate can cut the garbage, so that the garbage cannot be detained. The drainage system with the double-layer drainage grate can improve the drainage channel blockage situation of urban roads in rainy days, and reduce the garbage blockage problem caused by unreasonable design of the rainwater grate.

Drawings

Fig. 1 is an overall assembly view of a drainage system of the present invention.

Fig. 2 is a schematic view of the drainage device inside the drainage system of fig. 1 with the cover removed.

Fig. 3 is an enlarged view of a driving mechanism of the cylindrical drainage grate and the elongated rectangular drainage grate of fig. 2.

Fig. 4 is a schematic structural view of a power mechanism of the drainage system of the present invention.

Fig. 5 is a top view of the booster propeller of fig. 4.

Fig. 6 is a schematic view of the bottom view of the drainage system of the drainage mechanism of the present invention.

Reference numerals: the garbage bin comprises an outer cover 1, a ground drainage grate 2, a cylindrical drainage grate 3, a long rectangular drainage grate 4, a tail end convex cylinder 31, a crank 5, a disc 6, an inner convex cylinder 61, an outer disc 7, an outer convex cylinder 71, a sliding groove 72, a supporting plate 8, a left large round hole 81, a square array small hole 82, a right large round hole 83, a garbage penetrating plate 9, a garbage collecting and containing box 10, a pressurizing propeller 11, a water turbine 12, a first bevel gear 13, a middle position supporting column 130, a second bevel gear 14, a third bevel gear 15, a fourth bevel gear 16, a bearing seat 160, a left crawler 17, a right crawler 18, a low crawler wheel 19, a middle position crawler wheel 20, a high position crawler wheel 21 and an interlayer 22.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Example 1

The drainage system comprises a double-layer drainage grate, a transmission mechanism of a lower-layer drainage grate, a power mechanism and a drainage mechanism. Fig. 1 is a schematic view illustrating the overall assembly of the drainage system of the present invention, which is installed under the ground. The drainage system of fig. 1 comprises a housing 1 and an internal drainage means. The top surface of the outer cover 1 is provided with a ground drainage grate 2, and the ground drainage grate 2 is flush with the ground and used for leaking ground water and garbage to be discharged into a sewer.

Fig. 2 is a schematic view showing the structure of the drainage device inside the drainage system of fig. 1 with the cover 1 removed. This inside drainage device is including being located the lower floor drainage comb under 2 drainage combs on ground, and two-layer drainage comb closely sets up, and the interval sets up to 1 ~ 10cm to be used for doing effective shearing movement. The lower drainage grate is of a long-strip U-shaped groove structure, cylindrical drainage grates 3 and long-strip rectangular drainage grates 4 are fixedly arranged in the long-strip U-shaped groove at intervals, and a protruding sliding block is further arranged on the outer side face of the lower drainage grate. The cylindrical drainage grate 3 and the strip-shaped rectangular drainage grate 4 can be integrally driven to move back and forth so as to cut and shear solid garbage falling from the ground drainage grate 2 and reduce garbage accumulation entering a sewer.

Fig. 3 is an enlarged view of the driving mechanism of the cylindrical drainage grate 3 and the elongated rectangular drainage grate 4 of fig. 2. The transmission mechanism for the reciprocating movement of the cylindrical drainage grate 3 and the strip-shaped rectangular drainage grate 4 comprises a crank 5, a disc 6 and an outer disc 7. The disc 6 is arranged in a circular groove arranged on the outer disc 7 in a matching way, and the disc 6 can be driven by a power mechanism to rotate in the circular groove. An inner convex cylinder 61 is arranged on the upper surface of the disc 6 close to the edge, an outer convex cylinder 71 is arranged on the upper surface of the outer disc 7 which is not located in the circular groove, a sliding groove 72 is formed in the outer side surface of the outer disc 7, and the outer convex cylinder 71 is arranged on one side far away from the sliding groove 72. The sliding block of the lower drainage grate is embedded into the sliding groove 72, and the sliding block can slide in the sliding groove 72 under the action of external force.

A tail end convex column 31 is arranged between the cylindrical drainage grate 3 and the strip-shaped rectangular drainage grate 4 in the U-shaped groove of the lower drainage grate. The crank 5 is a strip-shaped structure and is horizontally placed, three sections of longitudinally penetrating holes are formed in the crank 5, and a first section of hole, a second section of hole and a third section of hole are sequentially formed in the three sections of holes from one end to the other end. The first section of hole is cylindrical, the diameter of the first section of hole is consistent with that of the convex cylinder 71, and the convex cylinder 71 penetrates into the first section of hole upwards; the second section of hole is strip-shaped, the width of the second section of hole is the same as the diameter of the inner convex cylinder 61, and the inner convex cylinder 61 penetrates into the second section of hole upwards and can slide in the strip-shaped hole; the third section of hole is the terminal open-ended bar hole, and its width is the same with terminal convex cylinder 31's diameter, and terminal convex cylinder 31 upwards penetrates this terminal open-ended bar hole.

The disc 6 is driven by a power mechanism connected with the lower end of the disc to rotate, the inner convex cylinder 61 makes circular motion along with the disc, the circular motion of the inner convex cylinder 61 drives the crank 5 to make sector rotation by taking the outer convex cylinder 71 as an approximate circle center, the tail end convex cylinder 31 is driven to move back and forth in the third section hole of the crank 5, and the moving track of the tail end of the crank 5 becomes an arc of the sector rotation pattern. Since the sliding blocks of the lower drainage grate are confined in the sliding grooves 72, the end convex cylinders 31 linearly move back and forth relative to the sliding grooves 72, and accordingly, the cylindrical drainage grate 3 and the elongated rectangular drainage grate 4 linearly move back and forth along the sliding grooves 72. Therefore, the cylindrical drainage grate 3 and the long rectangular drainage grate 4 do reciprocating linear motion relative to the fixed ground drainage grate 2, and grid lines of the cylindrical drainage grate 3 and the long rectangular drainage grate 4 are perpendicular to grid lines of the ground drainage grate 2, so that the reciprocating motion can effectively cut hard and brittle objects such as branches and the like, and the problem that drainage cannot be normally performed due to the fact that a drainage outlet is blocked by sundries such as dead tree leaves and dead tree branches is effectively solved. The long rectangular drainage grate 4 is provided with a sharp edge and is easy to shear garbage, the cylindrical drainage grate 3 can shear garbage relative to the shearing movement of the ground drainage grate 2 and is also easy to penetrate through the garbage, and the garbage retention is reduced. As can be seen from the above, the transmission mechanism is used for converting the circular motion of the disc 6 into the back-and-forth linear motion of the cylindrical drainage grate 3 and the strip-shaped rectangular drainage grate 4.

As shown in fig. 2, the drainage system of the present invention further comprises a support plate 8, the outer tray 7 and the lower drainage grate are installed on the support plate 8, and the support plate 8 is fixed on the outer cover 1. Three groups of holes are formed in the supporting plate 8, and the three groups of holes are close to the lower-layer drainage grate and used for draining the sheared garbage and water. The first set of holes is a left large circular hole 81 adjacent to the cylindrical drain grate 3. The second set of holes is a middle square array of small holes 82. The third group of holes is a right large circular hole 83 adjacent to the elongated rectangular drainage grate 4. Wherein, the water and the tiny garbage flowing into the middle square array small hole 82 flow to the power mechanism of the drainage system, the mechanical energy of the water flow is converted into the mechanical energy of the power mechanism, and the water and the garbage flowing into the left big round hole 81 and the right big round hole 83 flow to the drainage mechanism of the drainage system.

Fig. 4 is an enlarged schematic view of the power mechanism in fig. 1. The power mechanism of the drainage system comprises a pressurizing propeller 11, a water turbine 12, a first bevel gear 13, a second bevel gear 14, a third bevel gear 15, a fourth bevel gear 16 and a connecting rod. The booster propeller 11 is connected to the square array of apertures 82 above by a duct (not shown in figure 5). The top view structure of the supercharging propeller 11 is shown in fig. 5, and comprises three blades, a central shaft, a cross fixed on the central shaft and a peripheral protective ring sleeve. The center of the water turbine 12 is a section of vertical connecting rod, and the pressurizing propeller 11 is rotatably sleeved on the vertical connecting rod of the water turbine 12 through a central shaft of the pressurizing propeller. Pressure boost screw 11 is by electric drive, and three flabellums rotate and cause the negative pressure, make rivers pass through the flabellum gap fast to strike the hydraulic turbine 12 of below fast, rivers promote hydraulic turbine 12 rotatory, and the mechanical energy of rivers turns into the mechanical energy of hydraulic turbine 12, and when the ponding that needs were discharged becomes more moreover, the rotation of hydraulic turbine 12 can be accelerated to the rivers of increase, lets the frequency of lower floor's drainage comb reciprocating motion strengthen, does benefit to dredging rubbish. The vertical connecting rod at the center of the water turbine 12 is fixedly connected to the first bevel gear 13 below, so that the water turbine 12 can drive the first bevel gear 13 to rotate. The vertical first bevel gear 13 is meshed with the horizontal second bevel gear 14, the second bevel gear 14 is fixedly connected with a horizontal third bevel gear 15 through a section of horizontal connecting rod, the third bevel gear 15 is meshed with a vertical fourth bevel gear 16, a section of vertical connecting rod is fixedly connected above the fourth bevel gear 16, and the vertical connecting rod penetrates through the outer disc 7 through a bearing and is fixedly connected to the disc 6. The vertical connecting rod of the fourth bevel gear 16 connected with the disc 6 also passes downwards through the fourth bevel gear 16 and is connected to a partition 22 arranged inside the outer cover 1 through a bearing seat 160 (the partition 22 is shown in figure 1), so as to provide support for the fourth bevel gear 16. The mutually meshed conical surfaces of the first bevel gear 13, the second bevel gear 14, the third bevel gear 15 and the fourth bevel gear 16 are limited to the outer peripheries of the gears, and the central positions of the bevel gears are all plane-type non-contact. A middle support column 130 is arranged right below the first bevel gear 13, the lower end of the middle support column 130 is fixed on the interlayer 22, and a vertical connecting rod connecting the water turbine 12 and the first bevel gear 13 further downwards passes through the center of the first bevel gear 13 and is connected to the upper end of the middle support column 130 through a bearing seat.

Through the connecting structure, water flow pushes the water turbine 12 to rotate, the first bevel gear 13 rotates along with the water turbine, the second bevel gear 14 is driven to rotate, the third bevel gear 15 rotates along with the water turbine coaxially, the fourth bevel gear 16 is driven to rotate, the disc 6 is driven to rotate in the circular groove of the outer disc 7, the cylindrical drainage grate 3 and the long rectangular drainage grate 4 do reciprocating linear movement through the cooperation of the transmission mechanism where the crank 5 is located through the inner convex cylinder 61 fixed on the disc 6 and the crank 5 in sliding connection, and therefore the cylindrical drainage grate 3 and the long rectangular drainage grate 4 are matched with the ground drainage grate 2 fixed above to do shearing movement, solid garbage flowing in from the ground drainage grate 2 can be sheared, and the purposes of smashing and garbage cleaning are achieved. The bevel gear and the connecting rod fixed with the bevel gear can be matched and fixed through an H7/H6 hole shaft. Wherein, the shape and size of the first bevel gear 13 and the fourth bevel gear 16 are the same, and the shape and size of the second bevel gear 14 and the third bevel gear 15 are the same.

As shown in fig. 6, which is a bottom view of fig. 2, including the ejection mechanism. The discharging mechanism comprises double discharging pipes, double tracks, track wheels, track wheel connecting rods, a garbage penetrating plate 9 and a garbage collecting and accommodating box 10. The two crawler belts are arranged in parallel, have the same size, are inclined at an angle of 15 degrees relative to the horizontal plane, and are driven to rotate by the power mechanism. The double crawler belt is divided into a left crawler belt 17 and a right crawler belt 18 according to the direction, three crawler wheels are arranged in each crawler belt, the three crawler wheels are parallel and are arranged on the same inclined straight line, and the size of the two groups of six crawler wheels is equal. Because the crawler belt is obliquely arranged relative to the horizontal plane, the three crawler wheels are also arranged from low to high and comprise a low crawler wheel 19, a middle crawler wheel 20 and a high crawler wheel 21, the upper surface of the crawler belt is turned to the high crawler wheel 21 by the low crawler wheel 19, and the lower surface of the crawler belt is turned to the low crawler wheel 19 by the high crawler wheel 21. The middle crawler wheel 20 of the left crawler 17 is fixed outside the horizontal connecting rod between the second bevel gear 14 and the third bevel gear 15, and rotates synchronously with the horizontal connecting rod. The vertical first bevel gear 13 is meshed with the horizontal second bevel gear 14, the meshed conical surfaces of the first bevel gear and the second bevel gear are only limited to the peripheries of the gears, and the central positions of the two bevel gears are both flat and not contacted, so that a horizontal connecting rod is fixedly connected to the central plane of the second bevel gear 14, the horizontal connecting rod can rotatably penetrate through the central support column 130 and is fixed on the end face of the central crawler wheel 20 of the right crawler 18, and the two central crawler wheels 20 can coaxially and synchronously rotate. The second bevel gear 14 rotates clockwise when viewed from the front toward the center plane thereof, so as to drive the upper surface of the track to move from the lower position to the upper position. The low-level crawler wheel 19 of the left crawler 17 and the low-level crawler wheel 19 of the right crawler 18 are fixedly connected in an interference fit manner through a section of horizontal connecting rod so as to realize coaxial synchronous rotation, the horizontal connecting rod is supported by a shorter supporting column, and the supporting column is also fixed on an interlayer 22 arranged inside the outer cover 1. The high-level track wheels 21 of the left track 17 and the high-level track wheels 21 of the right track 18 are also fixedly connected in an interference fit manner by a section of horizontal connecting rod, which is supported in the garbage collection container 10 by a higher support column, so as to realize coaxial and synchronous rotation. In the operation process of the crawler, the middle crawler wheel 20 is a driving wheel, and the low crawler wheel 19 and the high crawler wheel 21 are driven wheels. The elevated track wheels 21 act as the transport ends of the tracks from which large refuse will fall into the refuse receptacle 10 below. The garbage collection and storage box 10 penetrates through the interlayer 22 downwards, abuts against the inner bottom surface of the outer cover 1 and penetrates out of the side wall of the outer cover 1 laterally, and large garbage flows out of the outer cover 1 through the garbage collection and storage box 10 and can be collected manually for further treatment.

In the discharge mechanism, the left large circular hole 81 connects one discharge pipe to above the left crawler 17, and the right large circular hole 83 connects the other discharge pipe to above the right crawler 18. The garbage permeating plate 9 is vertically arranged outside the two low crawler wheels 19, and the lower end of the garbage permeating plate is connected with the interlayer 22 in the outer cover 1. The garbage penetrating plate 9 serves as the side wall of the outer cover 1, grid holes are formed in the garbage penetrating plate and used for penetrating through garbage, grids can be square, and the side length can be 2-12 cm.

The garbage discharged from the left large circular hole 81 and the right large circular hole 83 to the upper side of the crawler belt through the discharge pipes has a certain adsorption capacity to the large garbage due to the surface of the crawler belt, and in the rotation process of the crawler belt, the large garbage is adsorbed on the crawler belt, runs obliquely upwards along with the crawler belt, and falls into the garbage collection box 10. The waste and water not adsorbed by the caterpillar band flow downwards and leave the caterpillar band, penetrating through the grid holes of the plate 9 into the sewer.

Example 2

In a second embodiment of the drainage system of the present invention, three sets of holes formed in the supporting plate 8 are all provided with siphon-type rain hoppers to increase the water flow speed, increase the power transmission and improve the rotational mechanical energy of the water turbine 12, and the other structures are the same as those of example 1.

For example, the present invention may be configured such that the water turbine 12 is directly driven to rotate by electricity without providing the supercharging propeller 11 to provide the shearing power of the drainage grate and the power for rotating the caterpillar track. For example, the cylindrical drainage grate 3 and the long rectangular drainage grate 4 in the lower drainage grate are not limited to the cylindrical and long rectangular shapes, and can also be knife blades which are beneficial to garbage chopping. For example, the grid lines of the cylindrical drainage grate 3 and the long rectangular drainage grate 4 and the grid lines of the ground drainage grate 2 can be in a vertical relation and can also intersect at an angle of 60 degrees, and the lower drainage grate moves back and forth along the grid line direction of the ground drainage grate 2.

Claims (10)

1. The utility model provides a drainage system with double-deck drainage grate which characterized in that: the drainage system comprises a double-layer drainage grate, a transmission mechanism, a power mechanism and a drainage mechanism; the power mechanism is connected with the transmission mechanism, the transmission mechanism is connected with the double-layer drainage grate, the transmission mechanism drives the double-layer drainage grate to do relative shearing motion, and water and garbage sheared by the double-layer drainage grate are discharged into a sewer through the discharge mechanism; the double-layer drainage grate comprises a fixed ground drainage grate (2) and a lower-layer drainage grate located below the ground drainage grate (2), the lower-layer drainage grate comprises a cylindrical drainage grate (3) and a long-strip rectangular drainage grate (4) which are fixed on the same layer and relatively, and the lower-layer drainage grate is driven by a transmission mechanism to move back and forth.

2. The drainage system having the double-layered drainage grate as set forth in claim 1, wherein: grid lines of the cylindrical drainage grate (3), the long rectangular drainage grate (4) and the ground drainage grate (2) are all linear; in the process that the lower drainage grate is driven by the transmission mechanism to do back-and-forth linear motion, the grid lines of the cylindrical drainage grate (3) and the long rectangular drainage grate (4) and the grid lines of the ground drainage grate (2) do back-and-forth motion in a crossing way.

3. The drainage system having the double-layered drainage grate as set forth in claim 2, wherein: grid lines of the cylindrical drainage grate (3) and the strip-shaped rectangular drainage grate (4) are perpendicular to grid lines of the ground drainage grate (2), and the lower drainage grate moves back and forth along the grid line direction of the ground drainage grate (2).

4. The drainage system having the double-layered drainage grate as set forth in claim 2, wherein: the grid lines of the cylindrical drainage grate (3) and the strip-shaped rectangular drainage grate (4) are crossed with the grid lines of the ground drainage grate (2) to form an angle of 60 degrees, and the lower drainage grate moves back and forth along the grid line direction of the ground drainage grate (2).

5. The drainage system having the double-layered drainage grate as set forth in claim 1, wherein: the double-layer drainage grates are arranged at a short distance, and the distance between the double-layer drainage grates is 0-10 cm.

6. The drainage system having the double-layered drainage grate as set forth in claim 1, wherein: the long rectangular drainage grate (4) is provided with a sharp edge.

7. The drainage system having the double-layered drainage grate as set forth in claim 1, wherein: the lower drainage grate is of a long-strip U-shaped groove structure, a cylindrical drainage grate (3) and a long-strip rectangular drainage grate (4) are fixedly arranged in the long-strip U-shaped groove at intervals, the cylindrical drainage grate (3) is provided with a cylindrical grid line, the long-strip rectangular drainage grate (4) is provided with a long-strip rectangular grid line, and the grid line of the cylindrical drainage grate (3) and the grid line of the long-strip rectangular drainage grate (4) are parallel to each other.

8. The drainage system having the double-layered drainage grate as set forth in claim 7, wherein: the outer side surface of the lower drainage grate is provided with a convex sliding block, the transmission mechanism is provided with a sliding groove (72), and the sliding block is embedded into the sliding groove (72); a tail end convex cylinder (31) is arranged between the cylindrical drainage grate (3) and the strip rectangular drainage grate (4) in a U-shaped groove of the lower drainage grate, and the transmission mechanism drives the lower drainage grate to move back and forth along the sliding groove (72) by driving the tail end convex cylinder (31).

9. The drainage system having the double-layered drainage grate as set forth in claim 1, wherein: the drainage system comprises an outer cover (1), and the ground drainage grate (2) is fixedly arranged on the top surface of the outer cover (1); a fixed support plate (8) is arranged in the outer cover (1); the lower drainage grate is arranged on the supporting plate (8).

10. The drainage system having the double-layered drainage grate as set forth in claim 9, wherein: a left large round hole (81), a middle square array small hole (82) and a right large round hole (83) are formed in the position, close to the side edge of the lower-layer drainage grate, on the supporting plate (8); water flow of the left large circular hole (81) and the right large circular hole (83) is communicated with the discharging mechanism, the discharging mechanism is provided with a garbage sorting device and a garbage penetrating device, and the diameter of garbage penetrating is 6-11 cm; the water flow of the square array small holes (82) is led to the power mechanism, and the mechanical energy of the water flow is transferred to the mechanical energy of the power mechanism.

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