CN215140859U - Foundation pit excavation silt particle piece-rate system - Google Patents

Abstract

The utility model discloses a foundation ditch excavation silt particle piece-rate system, include: a feeder; the sand washing device comprises a lifter, sand washing equipment and a vibrating dewatering screen which are connected with the feeder, and the feeder, the lifter, the sand washing equipment and the vibrating dewatering screen form an Jiong-shaped structure; the mud treatment device comprises a mud water recovery tank positioned in an Jiong-shaped structure of the sand washing equipment, a settling tank positioned outside a Jiong-shaped structure and positioned on one side far away from an opening of a Jiong-shaped structure, and a mud press; a fine sand conveyor belt; a dry mud conveyer belt. Through the utility model discloses the scheme, this foundation ditch excavation silt particle piece-rate system's overall arrangement is compact, reasonable, reduces area, can arrange a plurality of wheeled sand washers in limited space to cooperation slot type sand washer improves the separation efficiency of silt particle.

Description

Foundation pit excavation silt particle piece-rate system

Technical Field

The utility model relates to a silt particle separation technical field especially relates to a foundation ditch excavation silt particle piece-rate system.

Background

When the construction of projects such as hospitals and the like is carried out, the flat earth and stone excavation amount of an earth and stone outward transport project field can reach about 157 ten thousand squares, the earth and stone excavation amount is huge, and the main component is silt. In order to realize the reduction, reutilization and resource utilization of the silt, silt separation treatment is usually carried out on the silt, the silt is separated into silt and sand by a silt separation system, pure silt is transported outside, the sand is recycled as a resource, the washed coarse sand is used for spraying and anchoring a supporting structure, and graded sand is transported to a stirring station to be made into pre-mixed mortar for masonry, plastering and decoration of projects such as drainage and the like, so that the recycling of resources is realized, and the environment is protected.

The occupied area of the mud-sand separation system is large, and how to effectively plan and arrange each device in the mud-sand separation system is one of the technical problems to be solved when the mud-sand separation system is installed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a foundation ditch excavation silt particle piece-rate system for among the solution prior art, how effectively plan the problem of arranging wherein each equipment.

In order to solve the above problem, the utility model adopts the following technical scheme:

the utility model provides a foundation ditch excavation silt particle piece-rate system, includes:

a feeder;

the sand washing device comprises a hoisting machine connected with the feeding machine, sand washing equipment connected with the hoisting machine and a vibrating dewatering screen connected with the sand washing equipment, and the feeding machine, the hoisting machine, the sand washing equipment and the vibrating dewatering screen form an Jiong-shaped structure in an enclosing mode;

the mud treatment device comprises a mud water recovery tank positioned in an Jiong-shaped structure of the sand washing equipment, a settling tank positioned outside the Jiong-shaped structure and positioned on one side far away from an opening of the Jiong-shaped structure, and a mud pressing machine, wherein the mud water recovery tank recovers mud water in the sand washing equipment, the settling tank receives the mud water in the mud water recovery tank, and the mud pressing machine receives wet mud in the settling tank;

the fine sand conveying belt is connected with the vibration dewatering screen, is positioned outside the Jiong-shaped structure and is vertical to the long edge of the Jiong-shaped structure;

and the dry mud conveying belt is connected with the mud pressing machine and arranged side by side at intervals with the fine sand conveying belt.

Optionally, the sand washing equipment include with first wheeled sand washer that the lifting machine is connected, with the silt particle conveyer belt that first wheeled sand washer is connected and with the slot type sand washer that the silt particle conveyer belt is connected, the silt particle conveyer belt constitutes the minor face of Jiong shape structure, first wheeled sand washer with the slot type sand washer constitutes respectively Jiong shape structure's different long limits.

Optionally, the sand washing equipment further comprises a second wheel type sand washer located between the groove type sand washer and the vibrating dewatering screen, and the second wheel type sand washer forms a long edge of the Jiong-shaped structure.

Optionally, the muddy water recovery pond is located the inboard of silt conveyer belt and follows the silt conveyer belt extends.

Optionally, the sand washing device still include with the fine sand recovery machine that muddy water recovery pond is connected, the fine sand recovery machine constitutes Jiong shape structure the long limit and with the vibrations dewatering screen is located the both sides of fine sand conveyer belt, the fine sand recovery machine is followed the fine sand that the muddy water recovery pond retrieved fine sand and retrieved drops extremely the fine sand conveyer belt, the muddy water recovery pond is retrieved muddy water in the fine sand recovery machine.

Optionally, the sand washing device is still including being located the lifting machine with between the wheeled sand washing machine and separate the shale shaker of different diameter silt, with the recovery conveyer belt that the shale shaker is connected and is retrieved major diameter silt and with retrieve the system sand machine that the conveyer belt is connected, the shale shaker constitutes the long limit of Jiong shape structure, the recovery conveyer belt is located Jiong shape structure's inside, system sand machine is located Jiong shape structure's inside and broken silt by the lifting machine is carried extremely the shale shaker.

Optionally, a material pool which forms the long edge of the Jiong-shaped structure is arranged between the feeding machine and the hoisting machine, the material pool receives the muddy sand of the feeding machine and the sand making machine, the hoisting machine conveys the muddy sand in the material pool to the sand washing device, and the muddy water in the material pool is recovered by the muddy water recovery pool.

Optionally, the mud processing apparatus still include with the medicinal cupping that the gunbarrel is connected and is used for holding liquid medicine.

Optionally, the mud pressing machine, the mud water recovery tank and the medicine tank are arranged side by side, and the mud pressing machine is located between the medicine tank and the mud water recovery tank.

Optionally, the settling tank and the dry sludge conveyer belt are respectively located on two sides of the sludge pressing machine and the medicine tank.

The utility model discloses a technical scheme can reach following beneficial effect:

the foundation pit excavation mud-sand separation system is compact and reasonable in layout, and occupied area is reduced. Like this, can arrange a plurality of wheeled sand washers in limited space to the cooperation slot type sand washer improves the separation efficiency of silt particle. And convenience is provided for subsequent arrangement of a drainage and water supply system.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof of the present invention explain the present invention and do not form an improper limitation to the present invention. In the drawings:

FIG. 1 is a schematic structural view of a system for separating mud and sand in foundation pit excavation according to the present invention;

fig. 2 is a sectional view of the silt separating mechanism disclosed by the present invention;

FIG. 3 is a schematic view of the arrangement structure of the silt separating mechanism and the trough type sand washer disclosed by the present invention;

fig. 4 is a schematic side structure view of the mud press disclosed by the utility model;

fig. 5 is a front cross-sectional view of the mud press disclosed by the utility model.

Wherein the following reference numerals are specifically included in figures 1-5:

a feeder-1; a sand washing device-2; a mud treatment device-3; a fine sand conveyer belt-4; a dry mud conveying belt-5; a water storage tank-6; a material pool-21; a hoist-22; a vibrating screen-23; a sand making machine-24; a first wheel sander-25; a sand conveyer belt-26; a tank type sand washer-27; a second wheel sander-28; a vibrating dewatering screen-29; a fine sand reclaimer-210; a recovery conveyer belt-211; support column-261; a mud water recovery tank-31; a settling tank-32; a mud press-33; a medicine tank-34; a rain shelter-35; a housing-331; -a drainage mechanism-332; a first water diversion plate-333; a second diversion plate-334; a third diversion plate-335; -336 drain opening; a bottom plate-71; a baffle-72; a discharge port-73; a material distributing slide way-74; total slide-741; a first partial slide-742; a second branch chute-743.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, the utility model discloses a foundation ditch excavation silt particle piece-rate system includes batcher 1, sand washing device 2, mud processing apparatus 3, fine sand conveyer belt 4 and dry mud conveyer belt 5. The sand washing device 2 comprises a material pool 21, a lifting machine 22, a vibrating screen 23, a sand making machine 24, a first wheel type sand washing machine 25, a silt conveying belt 26, a groove type sand washing machine 27, a second wheel type sand washing machine 28 and a vibrating dewatering screen 29. The material pool 21 is connected with the feeder 1, the silt that the feeder 1 sieves out directly falls into the material pool 21, the material pool 21 is a cement pool dug on the ground, and clear water is contained, so that the preliminary separation of silt is realized. The hoisting machine 22 is connected with the material pool 21, the silt of the material pool 21 is conveyed to the vibrating screen 23, the vibrating screen 23 screens the silt, the silt with smaller particles enters the first wheel type sand washer 25, the silt is separated by the first wheel type sand washer 25, the silt with larger particles enters the sand making machine 24 through the recovery conveyer belt 211, the silt is crushed by the sand making machine 24 and then enters the material pool 21, and the hoisting machine 22 conveys the silt to the vibrating screen 23. The silt screened out by the first wheel type sand washer 25 is conveyed to a silt conveyer belt 26, the silt conveyer belt 26 conveys the silt to a groove type sand washer 27, the groove type sand washer 27 separates the silt, the groove type sand washer 27 conveys the washed silt to a second wheel type sand washer 28, the second wheel type sand washer 28 conveys the silt to a vibration dewatering screen 29, the vibration dewatering screen 29 dewaters the fine sand, the fine sand is conveyed to a fine sand conveyer belt 4, the fine sand conveyer belt 4 conveys the fine sand to a stacking place, and a fine sand transport vehicle conveys the fine sand to a designated place.

The feeder 1, the material pool 21, the elevator 22, the vibrating screen 23, the first wheel type sand washer 25, the silt conveyer belt 26, the trough type sand washer 27, the second wheel type sand washer 28 and the vibrating dewatering screen 29 form an Jiong-shaped structure. The sand conveyor belt 26 forms the short side of the Jiong-shaped structure. The feeder 1, the material pool 21, the elevator 22, the vibrating screen 23 and the first wheel type sand washer 25 are linearly arranged and located at one end of the lower end of the sand conveying belt 26 to form a long edge of an Jiong-shaped structure. The trough sand washer 27, the second wheel sand washer 28 and the vibrating dewatering screen 29 are arranged in a straight line in sequence, and are positioned at the high end of the sand-mud conveying belt 26 to form the other long edge of the Jiong-shaped structure. The sander 24 and recovery conveyor belt 211 are located within the Jiong-shaped structure, generally on the side of the elevator 22. The fine sand conveyor belt 4 is arranged perpendicular to the vibrating dewatering screen 29, i.e. perpendicular to the long side of the Jiong-shaped structure, and outside the Jiong-shaped structure.

The elevator 22 can be a bucket elevator 22, and comprises two material conveying hoppers located on one side of the material pool 21 and two material conveying grooves located on one side of the first wheel type sand washer 25, wherein the two material conveying grooves are connected with the vibrating screen 23. And be equipped with two first wheeled sand washers 25 side by side, every first wheeled sand washer 25 corresponds with a defeated silo respectively to improve the treatment effeciency of silt particle.

Each first wheel type sand washer 25 is provided with a lap which is lapped on a sand conveyer belt 26, the lap is obliquely arranged from the first wheel type sand washer 25 to the sand conveyer belt 26, and the lap is higher in height than the first wheel type sand washer 25. The sand and mud carried out by the first wheel washer 25 fall over the sand and mud belt 26. So arranged, the first wheel sand washer 25 can be arranged perpendicular to the sand conveyor belt 26 to provide powerful support for the devices arranged in an Jiong-shaped structure. The working principle of the first wheel sand washer 25 is the same as usual and will not be described in detail here.

The two groove-type sand washers 27 are also arranged at the same side of the sand conveyor belt 26, the two groove-type sand washers 27 are arranged side by side, extend along the direction perpendicular to the sand conveyor belt 26 and are arranged in an inclined manner, and are higher at the end far away from the sand conveyor belt 26, i.e. close to the second wheel-type sand washer 28. At this time, a silt separating mechanism is provided below the silt conveyor 26.

As shown in fig. 2, the sand and mud separating mechanism includes a bottom plate 71 and a baffle 72 enclosed on the bottom plate 71. The bottom plate 71 is arranged below the silt particle conveyer belt 26 and extends along the silt particle conveyer belt 26 in an inclined manner, the bottom plate 71 is higher at the high end of the silt particle conveyer belt 26, and the high end of the bottom plate 71 receives silt particles falling from the silt particle conveyer belt 26. The baffle 72 is provided with two discharge ports 73 at an interval on one side facing the trough type sand washer 27, and one discharge port 73 is respectively corresponding to the upper part of each trough type sand washer 27. The bottom plate 71 is smoothly recessed from a high end to a low end to form a material separating slideway 74, the material separating slideway 74 comprises a total slideway 741 extending from the high end to the front of the high end discharge port 73 (namely, a discharge port close to the high end of the bottom plate 71), a first branch slideway 742 connected with the total slideway 741 and extending to the high end discharge port 73, and a second branch slideway 743 connected with the total slideway 741 and extending to the low end discharge port 73 (namely, a discharge port close to the low end of the bottom plate 71), part of the silt falls to one of the tank type sand washers 27 through the total slideway 741 and the first branch slideway 742, and part of the silt falls to the other tank type sand washer 27 through the total slideway 741 and the second branch slideway 743. So set up, can guarantee to drop to the silt particle volume of slot type sand washer 27 roughly the same from two discharge gates 73 through setting up categorised slide 74, improve the efficiency of each slot type sand washer 27 separation silt particle.

Further, the overall chute 741 is close to the side of the bottom plate 71 where the discharge port 73 is provided, with respect to the other side of the bottom plate 71. The second sub chute 743 is located near a side of the bottom plate 71 where the discharging hole 73 is located, with respect to the other side of the bottom plate 71. The second partial slide 743 is arc-shaped, and the bending direction of the second partial slide 743 is back to the side of the bottom plate 71 where the discharge hole 73 is arranged and faces to the other side of the bottom plate 71. At this time, the baffle 72 between the two discharging holes 73 is arranged at an obtuse angle, that is, the bottom plate 71 and the baffle 72 are arranged at a position of the second branch chute 743 farthest from the other side of the bottom plate 71 at an obtuse angle. So set up, guarantee that the silt particle can roll smoothly to low end discharge gate 73 from second branch slide 743, reduce the risk of piling up the silt particle on bottom plate 71.

The bottom plate 71 is bent at the high end and the sand falls to the bent portion of the bottom plate 71. Perpendicular to the extending direction of the bottom plate 71, the bottom plate 71 is recessed smoothly from the other side (the side far away from the lower discharge port 73) to the lower discharge port 73, and a part of the sand and mud rolls from between the material dividing slide 74 and the baffle 72 on the other side of the bottom plate 71 to the lower discharge port 73. The lower discharge port 73 extends to the baffle 72 abutting against the lower end of the bottom plate 71, and the silt rolling to the lower end of the bottom plate 71 rolls to the lower discharge port 73 along the baffle 72 at the lower end. So set up, the silt particle that drops from silt particle conveyer belt 26 is dispersed, reduces the accumulational risk of silt particle on bottom plate 71, guarantees that the silt particle can drop to slot type sand washer 27 smoothly from silt particle conveyer belt 26.

Furthermore, the silt particle separating mechanism can be fixed with the silt particle conveyer belt 26 and the two groove-type sand washers 27, namely, the lower end of the bottom plate 71 penetrates through the supporting columns 261 of the silt particle conveyer belt 26 and is fixedly connected with the supporting columns 261, meanwhile, the lower end of the bottom plate 71 is welded on the groove-type sand washer 27, the high end of the bottom plate 71 is connected with the other groove-type sand washer 27 through a connecting rod, and the silt particle separating mechanism is simple in structure and low in cost.

As shown in FIG. 3, two spiral sand washing rods 271 are arranged in each trough type sand washer 27, and the spiral sheets 272 of the spiral sand washing rods 271 are staggered along the length direction of the spiral sand washing rods 271. And in the same groove type sand washer 27, the dislocation distance of the spiral sheets of the two spiral sand washing rods 271 is 1-2 cm. The vertical distance of the spiral sheets of the two spiral sand washing rods in the same shell is less than 1cm, wherein the vertical distance is the axial distance of the vertical spiral sand washing rods. So set up, can carry the silt particle to the wheeled sand washer 28 of second through the cooperation of two spiral sand washing poles 271, reduce the silt particle and wash accumulational risk in the sand washer 27 of groove type to reduce the manual work and clear away the number of times of groove type sand washer 27, improve silt particle treatment effect.

There are also two of the second wheel sand washer 28 and the vibrating dewatering screen 29, respectively. Two second wheel sand washers 28 are arranged side by side, two vibrating dewatering screens 29 are arranged side by side, and each second wheel sand washer 28 and vibrating dewatering screen 29 are correspondingly arranged on each trough sand washer 27.

The mud treatment device 3 comprises a mud water recovery tank 31, a settling tank 32, a medicine tank 34 and a mud press 33. The muddy water recovery tank 31 is used for recovering muddy water in the material tank 21, the first wheel type sand washer 25, the groove type sand washer 27 and the second wheel type sand washer 28, the muddy water is conveyed into the settling tank 32 through a pipeline after being settled in the muddy water recovery tank 31, meanwhile, the liquid medicine in the medicine tank 34 is pumped into the settling tank 32, and the muddy water is separated into mud and water under the action of the liquid medicine. The wet mud after the separation is carried to pressing mud machine 33, presses mud machine 33 to press wet mud into dry mud after, carries to dry mud conveyer belt 5, and dry mud conveyer belt 5 will be done mud and carry to the windrow place, will do mud by dry mud transport vechicle and transport to appointed place.

The muddy water recovery tank 31 is provided in an Jiong-shaped structure, the extending direction thereof is the same as the extending direction of the muddy sand conveying belt 26, and the muddy water recovery tank 31 is located closer to the muddy sand conveying belt 26. The mud-water recovery tank 31 is a cement tank dug in the ground, and the upper tank wall thereof protrudes from the ground. And a pipeline for communicating the settling tank 32 and the muddy water recovery tank 31 is poured in the wall of the muddy water recovery tank 31 at one end of the muddy water recovery tank 31.

The mud press 33 is arranged on the other side of the mud-sand conveying belt 26 and outside the Jiong-shaped structure, and four mud presses 33 are arranged side by side along the extending direction of the mud-sand conveying belt 26, so that the wet mud treatment effect is improved. Moreover, a canopy 35 is provided above each mud press 33, and rain is covered by the canopy 35.

Further, as shown in fig. 4 and 5, the mud press 33 is composed of a casing 331, a bracket supporting the casing 331, a mud press 33 body fixed in the casing 331, and a drainage mechanism 332 disposed below the casing 331, and the mud press body presses wet mud into dry mud, and the structure is the same as that of the conventional mud press, and details thereof are not repeated.

The water discharge mechanism 332 includes a first water guide plate 333 connected to the cabinet 331 and positioned below the water discharge port 336, a second water guide plate 334 connected to the cabinet 331 and receiving the wastewater from the first water guide plate 333, and a third water guide plate 335 receiving the wastewater from the second water guide plate 334. The second water guide plate 334 is obliquely fixed downward at one end of the cabinet 331, and the second water guide plate 334 has an arc-shaped plate structure with two sides high and a middle low, and the middle may be lower than the two sides by, for example, 1 mm. The first water guide plate 333 is fixed to the other end of the cabinet 331, and the first water guide plate 333 extends obliquely downward to be close to the second water guide plate 334. The third water diversion plate 335 is fixed below the second water diversion plate 334 and extends obliquely downward, the third water diversion plate 335 is in an arc-shaped plate structure with a high middle part and low two sides, and the middle part can be higher than the two sides by 1mm, for example. So set up, make the sewage collecting tank in the inflow ground that waste water can be steady, reduce the degree of splashing of waste water on ground, guarantee the cleanliness around mud press 33.

The three water diversion plates can be metal plates. Both sides of the third water diversion plate 335 and the second water diversion plate 334 are provided with baffles, so that the wastewater can flow into the third water diversion plate 335 from the second water diversion plate 334. The third water diversion plate 335 and the baffle arranged thereon are of an integrated structure, and the second water diversion plate 334 and the baffle arranged thereon are of an integrated structure, so that the structure is simple. The bottom end of the third diversion plate 335 is higher than the bottom end of the bracket, and when the mud press 33 is installed, the interference between the third diversion plate 335 and the ground is reduced.

Further, the middle of the second diversion plate 334 corresponds to the middle of the third diversion plate 335, i.e. the middle of the second diversion plate 334 is substantially aligned with the middle of the third diversion plate 335 in the left-right direction. The third water diversion plate 335 is fixedly connected with the machine shell 331 and fixed at the same end of the machine shell 331 as the first water diversion plate 333. The horizontal distance between the bottom end of the third water diversion plate 335 and the second water diversion plate 334 is smaller than the horizontal distance between the bottom end of the first water diversion plate 333 and the second water diversion plate 334, that is, the width of the water outlet between the third water diversion plate 335 and the second water diversion plate 334 is smaller than the width of the water outlet between the first water diversion plate 333 and the second water diversion plate 334. Furthermore, the first water guide plate 333 may be a flat plate, that is, both surfaces of the first water guide plate 333 are flat. The inclination degree of the first water diversion plate 333 is smaller than that of the second water diversion plate 334, and the inclination degree of the second water diversion plate 334 is smaller than that of the third water diversion plate 335. So set up, simple structure, the installation of being convenient for can further guarantee in the sewage collecting pit on steady gentle inflow ground of waste water moreover.

At this time, a drain outlet 336 may be provided at a lower middle portion of the case 331, and the drain outlet 336 extends perpendicular to a longitudinal direction of the first water guide plate 333, wherein the longitudinal direction of the first water guide plate 333 is a direction from a fixed end thereof to the other end thereof. And the density of water discharge ports 336 in the middle of cabinet 331 is less than the density of water discharge ports 336 on both sides, for example, the distance between water discharge ports 336 gradually decreases from the middle of cabinet 331 to both sides. So set up, slow down waste water velocity of flow layer upon layer from outlet 336 to third diversion board 335, guarantee the degree of splashing when waste water falls to ground.

The medicine tank 34 is positioned at one side of the mud press 33, namely the mud press 33 is positioned between the medicine tank 34 and the mud water recovery tank 31. And four medicine tanks 34 are also provided, and the four medicine tanks 34 are arranged side by side along the extending direction of the silt conveying belt 26.

The settling tank 32 is located at the corner position surrounded by the mud press 33 and the silt conveyer belt 26, is fixed in the water storage pool 6 through a support, and is communicated with the water storage pool 6 through a water pipe, the separated water in the settling tank 32 is pumped into the water storage pool 6, and the clear water in the water storage pool 6 is recycled again. Set up two gunning jars 32 side by side in the water storage pond 6, two gunning jars 32 communicate with water storage pond 6 through the water pipe respectively, and the one end setting of water pipe is at gunning jar 32's lateral wall top, and the other end stretches into in the water storage pond 6. When two settling tanks 32 are provided, the two settling tanks 32 are fixed in the water storage tank 6 by separate brackets, respectively.

The dry mud conveyer belt 5 is positioned at the other side of the mud press 33, the dry mud conveyer belt 5 and the settling tank 32 are respectively positioned at two sides of the mud press 33, and the dry mud conveyer belt 5 and the fine sand conveyer belt 4 are arranged side by side at intervals.

At this time, the sand washing device 2 further includes a fine sand recovery machine 210 connected to the slurry water recovery tank 31 through a fine sand recovery pipe, the fine sand recovery machine 210 recovers the fine sand in the slurry water recovery tank 31, and the fine sand recovery machine 210 conveys the fine sand to the fine sand conveyor belt 4 after processing the fine sand. The fine sand recycling machine 210 and the vibrating dewatering screen 29 are respectively positioned at two sides of the fine sand conveying belt 4, and the fine sand recycling machine 210, the vibrating dewatering screen 29 and the second wheel type sand washer 28 are linearly arranged, namely the fine sand recycling machine 210 is positioned at the long edge of the Jiong-shaped structure, so that the layout is compact, and the space is saved.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.

Claims (10)

1. The utility model provides a foundation ditch excavation silt particle piece-rate system which characterized in that includes:

a feeder;

the sand washing device comprises a hoisting machine connected with the feeding machine, sand washing equipment connected with the hoisting machine and a vibrating dewatering screen connected with the sand washing equipment, and the feeding machine, the hoisting machine, the sand washing equipment and the vibrating dewatering screen form an Jiong-shaped structure in an enclosing mode;

the mud treatment device comprises a mud water recovery tank positioned in an Jiong-shaped structure of the sand washing equipment, a settling tank positioned outside the Jiong-shaped structure and positioned on one side far away from an opening of the Jiong-shaped structure, and a mud pressing machine, wherein the mud water recovery tank recovers mud water in the sand washing equipment, the settling tank receives the mud water in the mud water recovery tank, and the mud pressing machine receives wet mud in the settling tank;

the fine sand conveying belt is connected with the vibration dewatering screen, is positioned outside the Jiong-shaped structure and is vertical to the long edge of the Jiong-shaped structure;

and the dry mud conveying belt is connected with the mud pressing machine and arranged side by side at intervals with the fine sand conveying belt.

2. The foundation pit excavation mud-sand separation system of claim 1, wherein the sand washing equipment comprises a first wheel type sand washer connected with the hoist, a mud-sand conveyer belt connected with the first wheel type sand washer, and a trough type sand washer connected with the mud-sand conveyer belt, wherein the mud-sand conveyer belt constitutes the short side of the Jiong-shaped structure, and the first wheel type sand washer and the trough type sand washer constitute different long sides of the Jiong-shaped structure respectively.

3. The excavation mud-sand separation system of claim 2, wherein the sand washing apparatus further comprises a second wheel washer located between the trough washer and the shaker dewatering screen, the second wheel washer forming a long side of the Jiong-shaped structure.

4. The excavation silt separation system of claim 2, wherein the mud-water recovery tank is located inside the silt conveyor and extends along the silt conveyor.

5. The excavation silt and sand separation system of claim 4, wherein the sand washing device further comprises a fine sand reclaimer connected to the mud water recovery tank, the fine sand reclaimer forms a long side of the Jiong-shaped structure and is located on both sides of the fine sand conveying belt with the vibrating dewatering screen, the fine sand reclaimer recovers fine sand from the mud water recovery tank and the recovered fine sand falls to the fine sand conveying belt, and the mud water recovery tank recovers mud water in the fine sand reclaimer.

6. The system for separating mud and sand in foundation pit excavation according to claim 5, characterized in that the sand washing device further comprises a vibrating screen which is located between the hoisting machine and the wheel type sand washing machine and used for separating mud and sand with different diameters, a recovery conveyer belt which is connected with the vibrating screen and used for recovering mud and sand with larger diameters, and a sand making machine which is connected with the recovery conveyer belt, wherein the vibrating screen forms the long side of the Jiong-shaped structure, the recovery conveyer belt is located in the Jiong-shaped structure, the sand making machine is located in the Jiong-shaped structure, and broken mud and sand are conveyed to the vibrating screen by the hoisting machine.

7. The foundation pit excavation mud-sand separation system of claim 6, wherein a material pool forming a long edge of the Jiong-shaped structure is arranged between the feeding machine and the hoisting machine, the material pool receives mud and sand of the feeding machine and the sand making machine, the hoisting machine conveys the mud and sand in the material pool to the sand washing device, and the muddy water recovery pool recovers muddy water in the material pool.

8. The excavation mud-sand separation system of any one of claims 1-7, wherein the mud treatment device further comprises a drug tank connected to the settling tank and configured to hold a drug solution.

9. The foundation pit excavation mud-sand separation system of claim 8, wherein the mud press, the mud-water recovery tank and the chemical tank are arranged side by side, and the mud press is located between the chemical tank and the mud-water recovery tank.

10. The foundation pit excavation mud-sand separation system of claim 9, wherein the settling tank and the dry mud conveyor belt are located on two sides of the mud press and the chemical tank, respectively.

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