CN211247361U

CN211247361U - Split type trucd mixer sewage treatment system

Info

Publication number: CN211247361U
Application number: CN201922269507.8U
Authority: CN
Inventors: 陈福奇; 肖龙华; 刘建兴; 周正胜
Original assignee: Hainan Jiankun Environmental Protection Engineering Co ltd
Current assignee: Hainan Jiankun Environmental Protection Engineering Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-08-14
Anticipated expiration: 2029-12-17

Abstract

The utility model discloses a split type trucd mixer sewage treatment system, include: the guide chute is used for collecting the sewage after the cleaning of the mixer truck; the stone separation device is used for separating stones from the sewage discharged from the material guide groove; the sand separation device is used for performing sand separation on the sewage subjected to the stone separation; the recovery tank is used for collecting the sewage after the separation of the stones and the sands is carried out; the fine sand separation device is used for performing fine sand separation on the sewage discharged from the recovery tank; the sewage pump is arranged at the bottom of the recovery tank, is connected with the fine sand separation device and is used for conveying the sewage in the recovery tank to the fine sand separation device; the stirring tank is connected with the fine sand separation device and is used for collecting low-concentration sewage discharged by the fine sand separation device; the recovery tank is connected with the fine sand separation device and is used for collecting high-concentration sewage discharged by the fine sand separation device. The utility model discloses can realize grit and the recycle who washs water in the sewage, resources are saved.

Description

Split type trucd mixer sewage treatment system

Technical Field

The utility model belongs to the technical field of the trucd mixer washs technique and specifically relates to a split type trucd mixer sewage treatment system is related to.

Background

With the development of the field of construction engineering year by year, the function of the mixer truck in the field of construction is not available. At present, because of the defects of the mixer truck equipment or the reasons of construction site limitation, the concrete materials in the mixer truck can not be used and finished, so that the concrete materials are left in the mixer truck, and if not cleaned in time, the concrete materials are not cleaned conveniently after solidification. However, the concrete contains a large amount of insoluble materials such as cement and mineral powder, and sewage cannot be poured randomly after the mixer truck is cleaned, so that a mixer truck sewage treatment system needs to be developed to effectively recycle the materials in the concrete and save resources.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of prior art, providing a split type trucd mixer sewage treatment system, can realize grit and the recycle who washs water in the sewage, resources are saved.

In order to realize the above purpose, the utility model provides a split type trucd mixer sewage treatment system, include:

the guide chute is used for collecting the sewage after the cleaning of the mixer truck;

the stone separation device is used for carrying out stone separation on the sewage from the material guide groove;

the sand separation device is used for performing sand separation on the sewage subjected to the stone separation;

the recovery tank is used for collecting the sewage after the separation of the stones and the sands is carried out;

the fine sand separation device is used for performing fine sand separation on the sewage from the recovery tank;

the sewage pump is arranged at the bottom of the recovery tank, is connected with the fine sand separation device and is used for conveying sewage in the recovery tank to the fine sand separation device;

the stirring tank is connected with the fine sand separation device and is used for collecting low-concentration sewage discharged by the fine sand separation device;

the recovery tank is connected with the fine sand separation device and is used for collecting high-concentration sewage discharged by the fine sand separation device;

the bottom of the stirring tank is connected with the sand separation device through a drain pipe, and a valve is arranged on the drain pipe; the bottom of the recovery tank is of a conical structure.

Furthermore, the stone separation device comprises a rack, a shell, a roller and a first rotary driving mechanism, wherein the roller is of a structure with two open ends; the shell and the first rotary driving mechanism are both arranged on the rack; the roller is horizontally arranged in the shell, and a rotating shaft is arranged in the center of the roller; two ends of the rotating shaft are rotatably connected with the shell, one end of the rotating shaft extends out of the roller and is then rotatably connected with the first rotary driving mechanism, inner spiral blades are arranged on the inner wall of the roller, and a plurality of sieve holes are arranged on the wall of the roller; the two opposite side surfaces of the shell are respectively provided with a liquid inlet and a stone outlet, and the bottom of the shell is provided with a liquid outlet.

Furthermore, the rotating shaft is connected with the inner wall of the roller through a plurality of stirring blades.

Furthermore, the stone separation device also comprises a compression roller mechanism, the compression roller mechanism comprises a support, a compression roller, an elastic compression bar and a connecting rod, and the support is connected with the inner wall of the shell; one end of each of the two supports is rotatably connected with one end of each of the two connecting rods, the other end of each of the two supports is movably connected with one end of each of the elastic pressing rods, the other ends of the two connecting rods are rotatably connected with the two ends of the pressing roller, and the other ends of the two elastic pressing rods are rotatably connected with the middle of the two connecting rods; the compression roller is attached to the outer wall of the roller.

Further, the elasticity depression bar includes spring, baffle and the body of rod, be equipped with the baffle on the body of rod, the one end of the body of rod with the overcoat has the spring between the baffle, be equipped with the perforation that the body of rod passed on the support, the perforation on the support is passed to the one end of the body of rod, just support and baffle are withstood respectively at the both ends of spring, the other end of the body of rod with rotate in the middle of the connecting rod and be connected.

Furthermore, the sand separation device comprises a liquid collecting hopper and a spiral conveyer, the liquid collecting hopper is installed above a liquid inlet of the spiral conveyer, the liquid collecting hopper is aligned to the liquid outlet of the shell, the spiral conveyer is arranged in an upward inclined mode, and a plurality of through holes are formed in spiral conveying blades of the spiral conveyer.

Further, the stirring tank is connected with the lower part of the liquid collecting hopper through a sewage draining pipe; the upper part of the liquid collecting hopper is connected with the upper part of the recovery tank through a liquid conveying tank.

Further, the fine sand separation device comprises a cyclone and a dewatering screen, wherein the cyclone is connected with the sewage pump and used for primary solid-liquid separation of sewage, the dewatering screen is arranged below the cyclone, the cyclone is connected with the stirring tank, and the dewatering screen is connected with the recovery tank.

The utility model has the advantages that:

1. the utility model discloses sewage after the trucd mixer washs retrieves through stone separator stone separation in proper order, realizes the grit separation again through grit separator and retrieves, realizes the fine sand separation through fine sand separator and retrieves after, and the low concentration sewage recovery after handling in the agitator tank, so realized grit and the recycle who washs water, resources are saved has realized the effective separation of grit in the sewage simultaneously.

2. The utility model discloses agitator tank bottom is connected with sand separator through the blow off pipe to open the valve after a period of time, make in the agitator tank bottom sedimentary a large amount of deposits flow into to sand separator automatically in, with the recovery processing who realizes the deposit, not only be favorable to improving the cleanliness of collecting sewage in the agitator tank, realize the periodic automatic clearance of deposit in the agitator tank simultaneously.

3. The utility model discloses recovery pond bottom adopts the toper structure, and the sewage pump is located the toper bottom of recovery pond, so under the effect of sewage pump, can take out the sewage in the recovery pond and the fine sand that contains completely, improves fine sand recovery efficiency.

4. The utility model discloses drive the cylinder and make rotary motion under the effect of first rotary driving mechanism among the stone separator, water and grit are then thrown away from the sieve mesh to get into grit separator, spiral blade effect including the stone is then under, discharge from the stone outlet of casing. The utility model discloses stone separator structural design is ingenious, convenient to use. The utility model discloses the pivot is connected with the cylinder inner wall through the stirring leaf, under the stirring leaf effect, has improved the holistic structural strength of cylinder greatly to improve stone separator's structural strength and life.

5. The utility model discloses under compression roller mechanism's effect, impress the stone that blocks up in the sieve mesh to the cylinder in, prevent that the stone card from causing the cylinder to block up in the sieve mesh, influence stone separation efficiency.

6. The utility model discloses the screw conveyer that grit separator includes is the tilt up setting to realize the quick effective separation of sand and water. The utility model discloses through-hole on the screw conveyer blade not only is favorable to alleviateing screw conveyer blade's weight, and save material is favorable to the quick drainage of grit simultaneously, improves sand-water separation efficiency, guarantees that the grit water content that screw conveyer sand outlet department came out is few.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a perspective view of the stone separating device of the present invention.

Fig. 3 is a perspective view of the roller and the pressing roller mechanism of the present invention.

Fig. 4 is a perspective view of the press roller mechanism of the present invention.

Fig. 5 is a perspective view of the sand separator of the present invention.

Fig. 6 is a perspective view of fig. 5 rotated by a certain angle.

Fig. 7 is a perspective view of the conveying mechanism of the present invention.

Fig. 8 is an enlarged view of fig. 7 at a.

Detailed Description

In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when in use, and are used for convenience of description and simplification of description, but do not refer to or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

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

As shown in fig. 1 to 6, the present embodiment provides a split type mixer truck sewage treatment system, including:

the guide chute 1 is used for collecting sewage after the cleaning of the mixer truck;

the stone separation device 2 is used for carrying out stone separation on the sewage from the material guide chute 1;

the sand separation device 3 is used for performing sand separation on the sewage subjected to the stone separation;

a recovery tank 4 for collecting the sewage (containing fine sand) after the separation of the stones and the sand;

the fine sand separation device 5 is used for performing fine sand separation on the sewage from the recovery tank 4;

the sewage pump 6 is arranged at the bottom of the recovery tank 4, is connected with the fine sand separation device 5, and is used for conveying sewage in the recovery tank 4 to the fine sand separation device 5;

the stirring tank 7 is connected with the fine sand separation device 5, and is used for collecting low-concentration sewage (containing a small amount of fine sand) discharged by the fine sand separation device 5;

the recovery tank 4 is connected with the fine sand separation device 5 and is used for collecting high-concentration sewage (containing part of fine sand) discharged by the fine sand separation device 5;

the bottom of the stirring tank 7 is connected with the sand separation device 3 through a drain pipe (not shown in the figure), and a valve (not shown in the figure) is arranged on the drain pipe; the bottom of the recovery tank 4 is of a conical structure.

In this embodiment, the agitator truck washs mainly to wasing the internal portion of agitator truck jar, baffle box 1 realizes the collection of the sewage after the washing, wherein baffle box 1 prefers to be the slope structure, in order under the action of gravity, sewage flows automatically to in stone separator 2, carry out the stone separation through stone separator 2 to sewage, rethread sand separator 3 carries out sand separation to the sewage after having carried out the stone separation, sewage after stone and sand separation then collects in recovery pond 4, carry the sewage in recovery pond 4 to fine sand separator 5 through sewage pump 5, accomplish the fine sand separation once more, thereby realize grit recycle. Wherein the low concentration sewage of fine sand separator 5 exhaust is collected in agitator tank 7, realizes wasing the recycle of water to be used for wasing trucd mixer etc. once more, resources are saved, and the high concentration sewage of fine sand separator 5 exhaust simultaneously flows back to in recovery pond 4, and the reentry is handled, with the improvement fine sand rate of recovery.

This embodiment can deposit a large amount of deposits in agitator tank 7 bottom after a period of time, opens the valve this moment for the deposit in agitator tank 7 bottom flows into in sand separator 3, in order to realize the recovery processing of deposit, not only is favorable to improving the cleanliness of collecting sewage in agitator tank 7, realizes the regular automatic clearance of deposit in agitator tank 7 simultaneously.

The bottom of the recovery tank 4 of the present embodiment is of a tapered structure, and the sewage pump 5 is located at the tapered bottom of the recovery tank 4. The sewage and the contained fine sand collected at the conical bottom of the recovery tank 4 can be completely pumped out under the action of the sewage pump 4, the recovery efficiency of the fine sand is improved, and the problem that the sewage and the contained fine sand are partially not pumped out due to deposition caused by the fact that the bottom of the recovery tank 4 is too wide is prevented.

Further, as shown in fig. 2 and 3, the stone separator 2 includes a frame 20, a housing 21, a roller 24, and a first rotary driving mechanism 23, wherein the roller 24 has a structure with two open ends; the housing 21 and the first rotary driving mechanism 23 are both mounted on the frame 20; the roller 24 is horizontally arranged in the shell 21, and a rotating shaft 26 is arranged in the center; two ends of the rotating shaft 26 are rotatably connected with the shell 21, one end of the rotating shaft extends out of the roller 24 and then is rotatably connected with the first rotary driving mechanism 23, inner spiral blades 25 are arranged on the inner wall of the roller 24, and a plurality of sieve holes 240 are arranged on the wall of the roller 24; two opposite side surfaces of the shell 21 are respectively provided with a liquid inlet and a stone outlet, and the bottom of the shell is provided with a liquid outlet. Preferably, the rotating shaft 26 is connected with the inner wall of the drum 24 through a plurality of stirring blades 27, and is used for supporting the drum 24 under the action of the stirring blades 27 to improve the structural strength of the drum 24, wherein the plurality of stirring blades 27 are uniformly distributed along the circumference in groups, and a plurality of groups of stirring blades 27 are arranged on the rotating shaft 26 at intervals along the length direction, so as to greatly improve the structural strength and the service life of the drum 24. In this embodiment, the first rotary driving mechanism 23 may be a motor directly or a combination of a motor and a transmission mechanism connected to the motor, wherein the transmission mechanism is rotatably connected to the rotating shaft 26 through a coupling, and the transmission mechanism may be an existing rack-and-pinion mechanism, a belt-and-pulley mechanism, or the like.

In this embodiment, the sewage from the material guiding chute 1 enters the drum 24 through the liquid inlet of the housing 21, and the drum 24 is driven to rotate by the first rotation driving mechanism 23, wherein the water and the sand are thrown out of the sieve holes 240 and enter the sand separating device 3 through the liquid outlet of the housing 21, and the stones are retained in the drum 24 and discharged from the stone outlet of the housing 21 under the action of the inner spiral blades 25.

Further, as shown in fig. 3 and 4, the stone separator 2 further comprises a press roller mechanism 28, the press roller mechanism 28 comprises a support 280, a press roller 281, an elastic press rod 282 and a connecting rod 283, the support 280 is connected with the inner wall of the housing 21; one end of each of the two holders 280 is rotatably connected to one end of each of the two connecting rods 283, the other end of each of the two holders 280 is movably connected to one end of each of the elastic pressing rods 282, the other end of each of the two connecting rods 283 is rotatably connected to both ends of the pressing roller 281, and the other end of each of the two elastic pressing rods 282 is rotatably connected to the middle of each of the two connecting rods 283; the pressing roller 281 is attached to the outer wall of the drum 24. In the present embodiment, the stones blocked in the sieve holes 240 are pressed into the drum 24 by the pressing roller mechanism 28, so that the stones are prevented from being stuck in the sieve holes 240 to block the drum 24, thereby preventing the stone separation efficiency from being affected. When the embodiment is used, the pressing roller 281 is pressed on the outer wall of the roller 24 all the time under the elastic force of the elastic pressing rod 282, so that the stones in the sieve holes 240 can be effectively pressed into the roller 24, and meanwhile, the pressing roller mechanism 28 is protected from being damaged. In this embodiment, the support 280 is rotatably connected with the link 283 through a pin shaft, the link 283 is rotatably connected with the press roller 281, and the elastic press rod 282 is rotatably connected with the link 283 through a cotter pin.

In this embodiment, the elastic pressing rod 282 includes a spring 2821, a baffle 2822 and a rod 2820, the baffle 2822 is disposed on the rod 2820, one end of the rod 2820 is connected with the spring 2821 which is sleeved between the baffle 2822, a through hole through which the rod 2820 passes is disposed on the support 280, one end of the rod 2820 passes through the through hole on the support 280, the two ends of the spring 2821 respectively support the support 280 and the baffle 2822, and the other end of the rod 2820 is connected with the middle of the connecting rod 283 in a rotating manner. Wherein be equipped with stop nut 2823 on the body of rod 2820, baffle 2822 overcoat is spacing on the body of rod 2820 through stop nut 2823. In this embodiment, one end of the rod 2820 penetrates through the length of the through hole on the support 280, so as to ensure that one end of the rod 2820 is not pulled away from the support 280 during the extension and retraction process of the spring 2821.

Further, as shown in fig. 5 and 6, the sand separating device 3 includes a liquid collecting bucket 30 and a screw conveyor 31, the liquid collecting bucket 30 is installed above a liquid inlet of the screw conveyor 31, the liquid collecting bucket 30 is aligned with the liquid outlet of the housing 21, the screw conveyor 31 is inclined upward, and a plurality of through holes 3101 are formed in the screw conveying blade 310 of the screw conveyor 31. In the embodiment, the sewage after the stones are separated by the stone separation device 2 falls into the sand separation device 3, wherein the sand sinks into the screw conveyor 31, and under the action of the screw conveyor 31, the sand in the sewage is effectively separated. Wherein screw conveyer 31 is the tilt up setting to realize the quick effective separation of sand water, the low concentration sewage that contains fine sand then gathers in collecting hopper 30 simultaneously, and it is interior to flow to recovery pond 4. Through-hole 3101 on the screw conveying blade 310 in this embodiment is not only favorable to reducing the weight of the screw conveying blade 31, saves materials, but also is favorable to quick sand drainage, improves the sand-water separation efficiency, and ensures that the sand water content discharged from the sand outlet of the screw conveyor 31 is low.

In the embodiment, the stirring tank 7 is connected with the lower part of the liquid collecting hopper 30 through a sewage draining pipe; the upper part of the collecting hopper 30 is connected to the upper part of the recovery tank 4 via a liquid transfer tank (not shown). Wherein the liquid collecting hopper 30 is provided with a sewage draining outlet 302 communicated with the sewage draining pipe and a liquid outlet window 301 communicated with the infusion groove.

Further, as shown in fig. 1, the fine sand separation device 5 includes a cyclone 51 connected to the sewage pump 6 for preliminary solid-liquid separation of sewage, and a dewatering screen 50 disposed below the cyclone 51, wherein the cyclone 51 is connected to the agitator tank 7, and the dewatering screen 50 is connected to the recovery tank 4. In this embodiment, the cyclone 21 has a liquid inlet, a bottom flow port and an overflow port, and primary solid-liquid separation of sewage is realized under the action of the cyclone 51, wherein the liquid inlet of the cyclone 51 is connected with the sewage pump 6 through a pipeline to convey the sewage in the recovery tank 4 into the cyclone 51, wherein the bottom flow port of the cyclone 51 is located above the dewatering screen 50, so that the high-concentration sewage (containing a large amount of fine sand) subjected to solid-liquid separation by the cyclone 51 falls onto the dewatering screen 50, and after the dewatering treatment by the dewatering screen 50, most of the fine sand is recovered, the sewage containing part of the fine sand flows back into the recovery tank 4 again, and meanwhile, the low-concentration sewage (containing a small amount of fine sand) flowing out of the overflow port of the cyclone 51 is collected in the stirring tank 7 to be used for cleaning the stirring truck and the.

Further, as shown in fig. 7 and 8, the sewage treatment system of the split-type mixer truck further includes a conveying mechanism 8, where the conveying mechanism 8 includes a conveying frame 80, a roller supporting mechanism 84, a conveying belt 83, a main driving roller 82, a driven roller 81, a second rotation driving mechanism (not shown in the figure) and a receiving hopper 85, and the second rotation driving mechanism is installed on the conveying frame 80; the main drive roller 82 and the driven roller 81 rotate respectively and install in the both ends of carriage 80, the second rotary driving mechanism with the main drive roller 82 rotates and connects, carriage 80 is equipped with a plurality of roller supporting mechanism 84 along the impartial interval in its direction of delivery's both edges, main drive roller 82 and driven roller 81 pass through the conveyer belt 83 is connected, just roller supporting mechanism 84 supports the conveyer belt 83, the both edges of conveyer belt 83 all by roller supporting mechanism 84 lifts up in the slant.

In this embodiment, the roller supporting mechanism 84 includes a roller 841 and a supporting frame 840, the supporting frame 840 is connected to the conveying frame 80, and the roller 841 is rotatably mounted on the supporting frame 840.

The conveying mechanism 8 is arranged below the stone outlet of the shell 21 in the embodiment, wherein stones at the stone outlet of the shell 21 fall on the conveying mechanism 8 through a stone outlet plate 23 (shown in fig. 2), and the stones are conveyed to the stone collecting area through the conveying mechanism 8 so as to finish the recovery of the stones. In this embodiment, the second rotation driving mechanism may be a motor as it is or a combination of a motor and a speed reducer.

In the present embodiment, the conveying mechanism 8 is also provided below the sand outlet of the sand separating device 3, and the sand discharged from the sand outlet of the sand separating device 3 falls on the conveying mechanism 8, and is conveyed to the sand collecting area through the conveying mechanism 8, so as to complete the recovery of the stone and sand.

In this embodiment, both edges of the conveyor belt 83 are lifted up obliquely upward under the action of the roller support mechanisms 84, so that the stones or sands cannot fall off from the edges of the conveyor belt 83 during the conveying process, and the stones or sands are guaranteed to be conveyed stably and effectively.

In this embodiment, as shown in fig. 7 and 8, the conveying mechanism 8 further includes a receiving hopper 85, the receiving hopper 85 includes an end surface sloping plate 851 and a side surface sloping plate 850, the two side surface sloping plates 850 are respectively connected to two sides of the end surface sloping plate 851, the two side surface sloping plates 850 form an upward horn structure, and the two side surface sloping plates 850 are both connected to the feeding end of the conveying frame 80 through a supporting rod 86; the receiving hopper 85 is located at the feed end of the conveyor belt 80. In the present embodiment, the receiving hopper 85 effectively raises the feed end of the conveyor 83, and even if stones or sand fall on the feed end of the conveyor 83, the stones or sand do not fall off the conveyor 83. Wherein the receiving hopper 85 is effectively supported at the feed end of the conveyor belt 83 by the action of the support rods 86. The gaps between the side inclined plates 850 and the end inclined plates 851 and the conveyor belt 83 are required to ensure that stones or sand do not leak out of the gaps and to prevent the conveyance of the conveyor belt 83 from being affected.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a split type trucd mixer sewage treatment system which characterized in that includes:

2. The split-type agitator truck sewage treatment system of claim 1, wherein the stone separation device comprises a frame, a shell, a roller and a first rotary driving mechanism, wherein the roller is of a structure with two open ends; the shell and the first rotary driving mechanism are both arranged on the rack; the roller is horizontally arranged in the shell, and a rotating shaft is arranged in the center of the roller; two ends of the rotating shaft are rotatably connected with the shell, one end of the rotating shaft extends out of the roller and is then rotatably connected with the first rotary driving mechanism, inner spiral blades are arranged on the inner wall of the roller, and a plurality of sieve holes are arranged on the wall of the roller; the two opposite side surfaces of the shell are respectively provided with a liquid inlet and a stone outlet, and the bottom of the shell is provided with a liquid outlet.

3. The split-type mixer truck sewage treatment system according to claim 2, wherein the rotating shaft is connected with the inner wall of the drum through a plurality of mixing blades.

4. The split-type agitator truck sewage treatment system of claim 2, wherein the pebble separation device further comprises a press roll mechanism, the press roll mechanism comprises a support, a press roll, an elastic press rod and a connecting rod, and the support is connected with the inner wall of the shell; one end of each of the two supports is rotatably connected with one end of each of the two connecting rods, the other end of each of the two supports is movably connected with one end of each of the elastic pressing rods, the other ends of the two connecting rods are rotatably connected with the two ends of the pressing roller, and the other ends of the two elastic pressing rods are rotatably connected with the middle of the two connecting rods; the compression roller is attached to the outer wall of the roller.

5. The split-type mixer truck sewage treatment system according to claim 4, wherein the elastic pressure rod comprises a spring, a baffle and a rod body, the baffle is arranged on the rod body, the spring is sleeved outside the position between one end of the rod body and the baffle, a through hole through which the rod body passes is arranged on the support, one end of the rod body passes through the through hole on the support, the two ends of the spring respectively support against the support and the baffle, and the other end of the rod body is rotatably connected with the middle of the connecting rod.

6. The split-type mixer truck sewage treatment system according to claim 2, wherein the sand separation device comprises a liquid collecting hopper and a screw conveyor, the liquid collecting hopper is mounted above a liquid inlet of the screw conveyor, the liquid collecting hopper is aligned with the liquid outlet of the housing, the screw conveyor is arranged in an upward inclined manner, and a plurality of through holes are formed in a screw conveying blade of the screw conveyor.

7. The split-type mixer truck sewage treatment system according to claim 6, wherein the mixer tank is connected with the lower part of the liquid collecting hopper through a sewage discharge pipe; the upper part of the liquid collecting hopper is connected with the upper part of the recovery tank through a liquid conveying tank.

8. The split-type mixer truck sewage treatment system according to claim 1, wherein the fine sand separation device comprises a cyclone connected to the sewage pump for preliminary solid-liquid separation of sewage and a dewatering screen disposed below the cyclone, the cyclone is connected to the agitator tank, and the dewatering screen is connected to the recovery tank.