Dust removal system and method for sweeping vehicle, and sweeping vehicle

Abstract

A dust removal system and method for a sweeping vehicle, and a sweeping vehicle. The dust removal system comprises a control unit, a dust suction assembly (1), a dust removal assembly, an air guide pipe (2), and a first dust collection cavity (4), a second dust collection cavity (5) and a dust removal cavity (6) which are arranged independently of one another, wherein the control unit controls, on the basis of a control signal output by a human-computer interaction unit, a fan to adjust the negative pressure suction intensity in real time; the first dust collection cavity (4) is in communication with the dust suction assembly (1) to collect first dust particles from original air to be subjected to dust removal; the dust removal assembly is mounted inside the dust removal cavity (6), one side of the dust removal assembly is in communication with the first dust collection cavity (4) to perform secondary dust removal on second dust-containing air obtained after first dust-containing air has undergone dust removal, and the other side of the dust removal assembly is in communication with the second dust collection cavity (5) to collect second dust particles obtained during the secondary dust removal; and the dust removal cavity (6) is in communication with the air guide pipe (2) to discharge third dust-containing air obtained during the secondary dust removal to the outside atmosphere through the air guide pipe (2). The dust removal system achieves a significant improvement in dust removal efficiency by means of multi-stage effective dust removal.

Description

Dust removal system, method and sweeper for sweeper TECHNICAL FIELD

[0001] The present application relates to a dust removal system, method and sweeper for sweeper, belonging to the technical field of environmental sanitation mechanical equipment. BACKGROUND

[0002] The current way of road cleaning by sweeper is to use negative pressure suction technology. Because the composition of road garbage is complex and the proportion of dust and other solid particles is high, in order to control the dust concentration at the outlet of the fan and avoid secondary pollution during operation, dust suppression measures need to be taken.

[0003] There are mainly two ways to suppress dust at present, which are wet spraying and dry filtering.

[0004] The wet dust removal has the following disadvantages: water spraying dust removal causes additional consumption of water resources and limits the single operation endurance time of the equipment, which is poor in use economy; secondly, for areas with large amount of garbage and heavy pollution, simple water spraying cannot suppress the dust generated during the cleaning process, and cannot effectively avoid the generation of secondary pollution; in addition, when used in a scene where the air temperature is below zero Celsius, the water spraying method is easy to cause the road surface to freeze, which has safety hazards.

[0005] Compared with wet dust removal, dry dust removal has a wider range of application and better dust removal effect. However, most of the dry dust removal on the current market adopts the method of filter membrane combined with pulse dust removal. If pulse dust removal is to be formed, a series of components such as gas source, gas bag, gas valve and the like are needed, the system is relatively complex, the risk of failure is relatively high, some manufacturers use the method of sharing the gas source with the chassis, which may cause the risk of insufficient braking force of the product; in addition, the blowing of high-speed airflow is easy to cause damage to the filter membrane, thus to a certain extent, the maintenance time of related parts is shortened. SUMMARY

[0006] The purpose of the present application is to provide a dust removal system, method and sweeper for sweeper, which aims to effectively improve the dust removal efficiency by adopting a multi-stage dry dust removal structure design with simple structure and high reliability.

[0007] To solve the above technical problems, the present application is realized by adopting the following technical scheme:

[0008] On the one hand, the present application provides a dust removal system for sweeper, which comprises a control unit, a dust suction assembly, a dust removal assembly, a wind guide pipeline, and a first dust collection cavity, a second dust collection cavity and a dust removal cavity which are independently arranged;

[0009] The control unit controls the fan communicated with the air guide duct according to the control signal output by the man-machine interaction unit electrically connected thereto, and adjusts the strength of negative pressure suction in real time.

[0010] The first dust collecting cavity is communicated with the dust suction assembly, and is used for collecting first dust particles in the first dust-containing air.

[0011] The dust removing assembly is installed in the dust removing cavity, one side of the dust removing assembly is communicated with the first dust collecting cavity, and is used for performing secondary dust removal on the second dust-containing air after dust removal of the first dust-containing air, and the other side of the dust removing assembly is communicated with the second dust collecting cavity, and is used for collecting second dust particles obtained through secondary dust removal.

[0012] One side of the top of the dust removing cavity is communicated with the air guide duct, and is used for discharging third dust-containing air obtained through secondary dust removal to the atmosphere through the air guide duct.

[0013] The dust-containing concentrations of the first dust-containing air, the second dust-containing air and the third dust-containing air are reduced in sequence, and the particle size of the first dust particles is greater than the particle size of the second dust particles.

[0014] The first dust collecting cavity is used for preliminary dust removal of original to-be-filtered pollutants, and part of the pollutants with large mass in the original to-be-filtered pollutants are collected through preliminary natural sedimentation according to their own weight and flow field effect; the second dust collecting cavity is used for separation of second dust particles and third dust-containing air from the second dust-containing air after preliminary filtration, so that the third dust-containing air after secondary dust removal meeting the actual emission standard is obtained, and the second dust particles are collected in the second dust collecting cavity.

[0015] Optionally, the first dust collecting cavity is communicated with the first dust outlet of the dust suction assembly, and is used for collecting the first dust particles; the dust removing assembly is installed at the bottom of the dust removing cavity, and one side of the dust removing assembly is provided with a dust inlet communicated with the first dust collecting cavity.

[0016] The lower end surface of the dust removing cavity and the upper end surface of the second dust collecting cavity are provided with a second dust outlet in the overlapping area, and are used for mutual communication between the dust removing cavity and the second dust collecting cavity; one side of the top of the dust removing cavity is also provided with a third dust outlet, and is used for mutual communication between the dust removing cavity and the air guide duct.

[0017] Optionally, the dust removal system for the cleaning vehicle further comprises a collection and detection assembly connected with a suction cylinder pipeline correspondingly provided in the dust suction assembly, for collecting and detecting the dust concentration of the first dust-containing air in the suction cylinder pipeline, and feeding back the dust concentration to the man-machine interaction unit; the design of the related collection and detection assembly enables the related dust removal system to adjust the air volume output by the fan according to the size of the dust content in the actual application process, so as to ensure that the dust removal effect can reach the optimum;

[0018] The man-machine interaction unit generates a corresponding control instruction according to the dust concentration, and outputs the control instruction to the control unit; the control unit controls the fan to adjust the strength of real-time negative pressure suction according to the control instruction.

[0019] Optionally, the dust removal system for the cleaning vehicle further comprises a guide plate installed on the box and located above the dust suction assembly, for making the first dust particles pre-settle and guiding the second dust-containing air. Compared with the dust particles directly colliding with the box and then settling, the design of the guide plate enables the related dust particles to collide with the contact object in advance, so that the pollutants with large mass can pre-settle to the bottom of the first dust collection chamber according to the factors of gravity and flow field, to complete the preliminary dust particle collection, and the dust removal efficiency is obviously higher.

[0020] Optionally, the guide plate is in a bent shape, for making the second dust-containing air advance towards the direction of the dust inlet. The related bent structure design can more effectively transport the remaining second dust-containing air after settling to the dust removal assembly, to complete the subsequent further dust removal treatment.

[0021] Optionally, the dust removal system for the cleaning vehicle further comprises a filter screen installed on one side of the dust inlet, for filtering the second dust-containing air once. The filter screen can effectively block large and light objects, to ensure that the dust at the outlet of the fan is low.

[0022] Optionally, the dust removal system for the cleaning vehicle further comprises at least one group of plate filter elements arranged above the dust removal assembly, for filtering the third dust-containing air twice; the plate filter element can further filter PM2.5 / PM10 in the dust-containing air twice, to reduce the risk of secondary pollution;

[0023] The plate filter element comprises: a mounting frame and a filter cloth; one end of the mounting frame is open, for being connected with the third dust outlet; the filter cloth is correspondingly arranged on the other end and the peripheral side of the mounting frame.

[0024] Optionally, the dust removal assembly is a reverse pre-filter, which comprises a shell and a plurality of separation pieces;

[0025] The separating piece comprises a guide pipe, a cyclone vane and a guide cone pipe; the guide pipe penetrates into the inner cavity of the guide cone pipe and is connected with the guide cone pipe through the cyclone vane; the top of the guide pipe abuts against the upper end surface of the shell, and the corresponding cone part of the guide cone pipe abuts against the lower end surface of the shell;

[0026] Under the cyclone action of the cyclone vane, the second dust particles in the second dust-containing air slide to the second dust outlet through the inner wall of the guide cone pipe, and then are discharged to the second dust collection cavity through the second dust outlet; the third dust-containing air is discharged to the corresponding dust removal cavity above the shell through the guide pipe, and waits for secondary filtration by the plate filter element; the air inlet and outlet directions are completely opposite in this process, and more than 90% of the dust can be effectively separated.

[0027] Optionally, the cyclone vane is obliquely arranged between the guide pipe and the guide cone pipe; the oblique design can introduce the dust-containing air to be filtered to the greatest extent, so as to effectively separate the dust particles from the target dust-containing air.

[0028] In a second aspect, the application further provides a cleaning vehicle dust removal method suitable for the cleaning vehicle dust removal system of the first aspect, and the method comprises the following steps:

[0029] The control unit controls the fan to adjust to the corresponding negative pressure suction strength according to the control signal output by the man-machine interaction unit;

[0030] The first dust-containing air is input into the first dust collection cavity through the dust suction assembly, and after primary dust removal, first dust particles and second dust-containing air are obtained, and the first dust particles are deposited in the first dust collection cavity;

[0031] The second dust-containing air is input into the dust removal assembly through the dust inlet, and after secondary dust removal, second dust particles and third dust-containing air are obtained, the second dust particles are discharged into the second dust collection cavity through the second dust outlet, and the third dust-containing air is discharged into the air guide pipe through the third dust outlet.

[0032] In a third aspect, the application further provides a cleaning vehicle comprising the cleaning vehicle dust removal system of the first aspect.

[0033] Compared with the prior art, the application has the following beneficial effects:

[0034] (1) The application collects dust particles in multiple processes through the dust collection cavities and dust removal cavities which are independent of each other and are connected with each other, thereby realizing effective dust removal of dust-containing air; the hierarchical dust removal method ensures that the dust removal effect is significantly improved, and the dust raised at the outlet of the fan is correspondingly reduced;

[0035] (2) The application adopts targeted four filtering, namely natural sedimentation, metal filter screen coarse filtration, reverse pre-filter and plate filter element fine filtration, so as to ensure that the dust-containing air after multiple filtration can meet the relevant emission standards, and the practicability is high; the reverse pre-filter can make the dust particles in the dust-containing air to be pre-filtered and the dust-containing air after pre-filtering be collected along opposite directions respectively, and the dust particles and the dust-containing air be further filtered, so that the separation effect is obvious and the efficiency is high;

[0036] (3) The application adopts a dry dust removal mode, so that the all-weather operation requirement is effectively met, the utilization rate of the equipment is significantly improved, and the related dust removal system does not need additional power, and the structure is simple and the reliability is high. BRIEF DESCRIPTION OF DRAWINGS

[0037] Fig. 1 is a rear view of one embodiment of the dust removal system for the sweeper according to the application;

[0038] Fig. 2 is a dust removal process schematic diagram of one embodiment of the dust removal system for the sweeper according to the application;

[0039] Fig. 3 is a structural schematic diagram of the dust collecting cavity in the dust removal system for the sweeper according to the application;

[0040] Fig. 4 is a structural schematic diagram of the plate filter element in the dust removal system for the sweeper according to the application;

[0041] Fig. 5 is a structural schematic diagram of the reverse pre-filter in the dust removal system for the sweeper according to the application;

[0042] Fig. 6 is a structural schematic diagram of the dissociation piece in the dust removal system for the sweeper according to the application;

[0043] Fig. 7 is a structural schematic diagram of the sealing door in the dust removal system for the sweeper according to the application;

[0044] Fig. 1 is a rear view of one embodiment of the dust removal system for the sweeper according to the application; DETAILED DESCRIPTION

[0045] The application will be further described below in combination with the drawings. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0046] Example 1

[0047] The embodiment introduces a dust removal system for a cleaning vehicle, which comprises a control unit, a dust suction assembly 1, a dust removal assembly, a wind guide pipeline 2, a box body 3, and a first dust collection cavity 4, a second dust collection cavity 5 and a dust removal cavity 6 which are independently arranged;

[0048] The control unit controls the fan connected with the wind guide pipeline 2 according to the control signal output by the man-machine interaction unit electrically connected with the control unit, and adjusts the strength of negative pressure suction in real time.

[0049] The first dust collection cavity 4 is connected with the dust suction assembly 1, and is used for collecting first dust particles in the first dust-containing air which is originally to be removed dust.

[0050] The dust removal cavity 6 is arranged at one side of the top of the box body 3, and the second dust collection cavity 5 is arranged at one side of the bottom of the box body 3; the dust removal assembly is installed in the dust removal cavity 6, one side of the dust removal assembly is connected with the first dust collection cavity 4, and is used for secondary dust removal of the second dust-containing air after the first dust-containing air is removed dust, and the other side of the dust removal assembly is connected with the second dust collection cavity 5, and is used for collecting the second dust particles obtained by the secondary dust removal.

[0051] One side of the top of the dust removal cavity 6 is connected with the wind guide pipeline 2, and is used for discharging the third dust-containing air obtained by the secondary dust removal to the atmosphere through the wind guide pipeline 2.

[0052] The dust-containing concentration of the first dust-containing air, the second dust-containing air and the third dust-containing air decreases in turn, and the particle size of the first dust particles is greater than the particle size of the second dust particles.

[0053] The first dust collection cavity 4 is connected with the first dust outlet corresponding to the dust suction assembly 1, and is used for collecting the first dust particles; the dust removal assembly is installed at the bottom of the dust removal cavity 6, and one side of the dust removal assembly is provided with a dust inlet connected with the first dust collection cavity 4.

[0054] The lower end surface of the dust removal cavity 6 and the upper end surface of the second dust collection cavity 5 are provided with a second dust outlet in the overlapping area, which is used for the mutual communication between the dust removal cavity 6 and the second dust collection cavity 5; one side of the top of the dust removal cavity 6 is also provided with a third dust outlet, which is used for the mutual communication between the dust removal cavity 6 and the wind guide pipeline 2.

[0055] Specifically, under the action of the negative pressure suction of the fan, the dust suction assembly 1 will suck the pollutants on the pavement into the first dust collecting chamber 4, and part of the pollutants with relatively large mass will settle at the bottom of the first dust collecting chamber 4 due to gravity and flow field factors, thereby completing the collection of the first dust particles. Further, the remaining dust-containing air, i.e. the second dust-containing air, will continue to move towards the air outlet direction, enter the dust removal assembly, and obtain the second dust particles and the third dust-containing air. The flow directions of the second dust particles and the third dust-containing air are different. The second dust particles will settle in the second dust collecting chamber 5 through the corresponding dust outlet, thereby completing the secondary collection of the dust particles. The third dust-containing air will communicate with the air guide pipeline 2 through the third dust outlet 9 in a direction opposite to the settling direction of the second dust particles, thereby completing the discharge of the dust-containing air.

[0056] Embodiment 2

[0057] Referring to FIGS. 1-3, based on the embodiment 1, the present embodiment adopts a four-stage filtration process of natural sedimentation, metal filter screen coarse filtration, reverse pre-filter and plate filter element fine filtration in sequence, to achieve effective dust removal of dust-containing air. The specific implementation process is as follows. By using the principle of fan negative pressure suction, the suction disc 24 in the dust suction assembly 1 will suck the pollutants (first dust-containing air) on the pavement into the first dust collecting chamber through the suction cylinder pipeline 10 in the suction disc assembly 1, and the suction cylinder pipeline 10 is directly communicated with the first dust collecting chamber 4. Then, under the action of the flow guide plate 11, part of the pollutants (first dust particles) with relatively large mass will settle at the bottom of the first dust collecting chamber 4 due to gravity and flow field factors.

[0058] Specifically, the flow guide plate 11 is installed on the box body 3 and located above the dust suction assembly 1, and is used for pre-settling the first dust particles and guiding the second dust-containing air. Compared with the direct collision of dust particles with the box and then settling, the design of the flow guide plate 11 can make the relevant dust particles collide with the contact object in advance, so that the pollutants with relatively large mass can be pre-settled at the bottom of the first dust collecting chamber 4 according to gravity and flow field factors, thereby completing the preliminary collection of dust particles, and the dust removal efficiency is obviously higher.

[0059] The flow guide plate 11 is in a bent shape, which is used for guiding the second dust-containing air to move towards the dust inlet 8. The structure design of the relevant bent shape can more effectively transport the remaining second dust-containing air after settling into the dust removal assembly, to complete the subsequent further dust removal treatment.

[0060] Further, the remaining dust-containing air (second dust-containing air) will continue to move towards the air outlet direction. A metal filter screen 12 is arranged in front of the reverse pre-filter 16, and the metal filter screen 12 is installed on one side of the dust inlet 8, which can further block the large and light objects.

[0061] The gas after the metal filter screen 12 enters the reverse pre-filter 16. The reverse pre-filter 16 comprises a shell 17 and a plurality of separation components 18, which can be referred to in detail with reference to FIG. 5. As shown in FIG. 6, the separation component 18 comprises a gas guide pipe 19, a cyclone vane 20 and a guide cone pipe 21; the gas guide pipe 19 penetrates into the inner cavity of the guide cone pipe 21 and is connected with the guide cone pipe 21 through the cyclone vane 20; the top of the gas guide pipe 19 abuts against the upper end surface of the shell 17, and the corresponding cone part of the guide cone pipe 21 abuts against the lower end surface of the shell 17.

[0062] Specifically, the gas guide pipe 19 and the guide cone pipe 21 are connected to form an integral whole through the cyclone vane 20. Through the action of the cyclone vane 20, the dust particles in the second dust-containing air will slide along the inner wall of the guide cone pipe 21 and be stripped from the air, and will fall to the bottom of the second dust collection chamber 5 under the influence of gravity. The third dust-containing air after pre-filtering will be discharged through the gas guide pipe 19, thereby realizing the filtration of the dust-containing air. Since the filtration process is completely opposite to the air inlet and outlet directions, this filtration link is called reverse type, which can realize the separation of more than 90% of the dust.

[0063] Specifically, the cyclone vane 20 is arranged in a diagonal manner between the gas guide pipe 19 and the guide cone pipe 21. The diagonal design can maximize the introduction of the dust-containing air to be filtered, so as to realize the effective separation of dust particles from the target dust-containing air.

[0064] In addition, with reference to FIG. 7, the first dust collection chamber 4 and the second dust collection chamber 5 are provided with corresponding sealing doors 22 away from the air guide pipe 2. The first dust collection chamber 4 and the second dust collection chamber 5 are sealed by the same back door, which is driven to open by an oil cylinder 23. The back door is divided into a first dust collection chamber sealing area and a second dust collection chamber sealing area, which can realize the separate sealing of different chambers and are not connected with each other during the operation, and can be dumped at one time, which is convenient to operate.

[0065] In order to further improve the dust removal rate and reduce the risk of secondary pollution, the PM2.5 / PM10 in the dust-containing air is filtered out. The embodiment further comprises at least one group of plate filter elements 13 arranged above the dust removal assembly, which are used for secondary filtration of the third dust-containing air, as shown in FIG. 4.

[0066] Specifically, the plate filter element 13 comprises a mounting frame 14 and filter cloth 15; one end of the mounting frame 14 is open and used for communication with the third dust outlet 9; and the filter cloth 15 is correspondingly arranged on the other end and the peripheral side surface of the mounting frame 14.

[0067] In practical applications, the plate filter element 13 filtering area can be matched according to the air flow to be filtered, and can be designed according to the actual space of the box 3, and is not limited to the shape and number of the plate filter element 13, and the residual solid particles are adsorbed as a fine filter unit. Further, the gas passing through the plate filter element 13 is guided to the fan inlet through the air guide pipe 2, and then discharged to the atmosphere after circulating in the fan. At this time, the dust concentration of the fan outlet can meet the relevant standard requirements.

[0068] Embodiment 3

[0069] The embodiment provides a dust removal method for a sweeper, which is suitable for the dust removal system for a sweeper as described in Embodiment 1 or Embodiment 2, and includes the following steps:

[0070] The control unit controls the fan to adjust to the corresponding negative pressure suction strength according to the control signal output by the man-machine interaction unit;

[0071] The first dust-containing air is input into the first dust collection cavity 4 through the dust collection assembly, and is subjected to primary dust removal to obtain first dust particles and second dust-containing air, and the first dust particles are deposited in the first dust collection cavity 4;

[0072] The second dust-containing air is input into the dust removal assembly through the dust inlet 8, and is subjected to secondary dust removal to obtain second dust particles and third dust-containing air, the second dust particles are discharged into the second dust collection cavity 5 through the second dust outlet, and the third dust-containing air is discharged into the air guide pipe 2 through the third dust outlet 9.

[0073] The dust removal system in the embodiment can further perform graded filtration and dust removal on the original pollutants to be filtered after the man-machine interaction unit determines the corresponding negative pressure suction strength. The dust particles obtained at each level of filtration are collected into the dust collection cavities arranged independently of each other. The related structure is simple, reasonable and compact, the dust removal efficiency brought by the overall process flow is significantly improved, and the practicality is relatively strong.

[0074] Embodiment 4

[0075] The embodiment provides a sweeper, which includes the dust removal system for a sweeper as described in Embodiment 1 or Embodiment 2.

[0076] In the description of the disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used only to explain the relative position relationship, movement condition and the like between the components in a certain specific posture. If the specific posture changes, the directional indication also changes accordingly. It is only for the convenience of describing the disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the disclosure.

[0077] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the disclosure, unless otherwise specified and limited, the term "a plurality of" means two or more.

[0078] In the description of the disclosure, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the disclosure can be understood according to the specific circumstances.

[0079] The above is only the preferred embodiment of the disclosure, it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the disclosure, can make several improvements and modifications, these improvements and modifications should be considered as the protection scope of the disclosure.

Claims

1. A dust removal system for a sweeper, characterized by comprising: The utility model relates to a dust collection device, including: A control unit, a dust suction assembly (1), a dust removal assembly, a wind guide pipe (2), and a first dust collection cavity (4), a second dust collection cavity (5) and a dust removal cavity (6) which are independently arranged; The control unit controls the fan connected with the wind guide pipe (2) according to the control signal output by the man-machine interaction unit electrically connected with the control unit, and adjusts the strength of negative pressure suction in real time; The first dust collection cavity (4) is connected with the dust suction assembly (1), and is used for collecting first dust particles in the first dust-containing air to be removed originally; The dust removal assembly is installed in the dust removal cavity (6), one side of the dust removal assembly is connected with the first dust collection cavity (4), and the dust removal assembly is used for secondary dust removal of the second dust-containing air after the first dust-containing air is removed; the other side of the dust removal assembly is connected with the second dust collection cavity (5), and the dust removal assembly is used for collecting the second dust particles obtained by secondary dust removal; One side of the top of the dust removal cavity (6) is connected with the wind guide pipe (2), and the third dust-containing air obtained by secondary dust removal is discharged to the atmosphere through the wind guide pipe (2); The dust concentration of the first dust-containing air, the second dust-containing air and the third dust-containing air decreases in turn, and the particle size of the first dust particles is larger than that of the second dust particles.

2. The dust extraction system for a scrubber according to claim 1, wherein The first dust collection cavity (4) is connected with the first dust outlet (7) corresponding to the dust suction assembly (1), and is used for collecting the first dust particles; the dust removal assembly is installed at the bottom of the dust removal cavity (6), and one side of the dust removal assembly is provided with a dust inlet (8) connected with the first dust collection cavity (4); The lower end surface of the dust removal cavity (6) and the upper end surface of the second dust collection cavity (5) are provided with a second dust outlet in the overlapping area, which is used for the mutual communication between the dust removal cavity (6) and the second dust collection cavity (5); one side of the top of the dust removal cavity (6) is also provided with a third dust outlet (9), which is used for the mutual communication between the dust removal cavity (6) and the wind guide pipe (2).

3. The dust extraction system for a scrubber according to claim 2, wherein It also includes a collection and detection assembly connected with the suction cylinder pipe (10) provided in the dust suction assembly (1), which is used for collecting and detecting the dust concentration of the first dust-containing air in the suction cylinder pipe (10) and feeding back the dust concentration to the man-machine interaction unit; The man-machine interaction unit generates corresponding control instructions according to the dust concentration and outputs the control instructions to the control unit; the control unit controls the fan to adjust the strength of negative pressure suction in real time according to the control instructions.

4. The dust extraction system for a scrubber according to claim 3, wherein It also includes a guide plate (11) installed on the box (3) and located above the dust suction assembly (1), which is used for pre-settling the first dust particles and guiding the second dust-containing air; The guide plate (11) is bent, which is used for making the second dust-containing air move towards the direction of the dust inlet (8).

5. The dust extraction system for a scrubber according to claim 4, wherein It also includes a filter screen (12) installed on one side of the dust inlet (8), which is used for filtering the second dust-containing air once.

6. The dust extraction system for a scrubber according to claim 5, wherein Further comprising at least one set of plate filter elements (13) arranged above the dust removal assembly for secondary filtering of the third dust-containing air; The plate filter element (13) comprises a mounting frame (14) and a filter cloth (15); the mounting frame (14) is open at one end for communication with the third dust outlet (9); and the filter cloth (15) is correspondingly arranged on the other end and the peripheral side of the mounting frame (14).

7. The dust extraction system for a scrubber according to claim 1 or 6, wherein The dust removal assembly is a reverse pre-filter (16) comprising a shell (17) and a plurality of separation components (18); The separation component (18) comprises a gas guide pipe (19), a cyclone vane (20) and a guide cone pipe (21); the gas guide pipe (19) penetrates into the inner cavity of the guide cone pipe (21) and is connected with the guide cone pipe (21) through the cyclone vane (20); the top of the gas guide pipe (19) abuts against the upper end surface of the shell (17), and the corresponding cone portion of the guide cone pipe (21) abuts against the lower end surface of the shell (17); Under the action of the cyclone vane (20), the second dust particles in the second dust-containing air slide along the inner wall of the guide cone pipe (21) to the second dust outlet, and then are discharged into the second dust collection cavity (5) through the second dust outlet; and the third dust-containing air is discharged into the corresponding dust removal cavity (6) above the shell (17) through the gas guide pipe (19), waiting for secondary filtering of the third dust-containing air by the plate filter element (13).

8. The dust extraction system for a scrubber according to claim 7, wherein The cyclone vane (20) is obliquely arranged between the gas guide pipe (19) and the guide cone pipe (1).

9. A method for dust removal for a cleaning vehicle suitable for use in the dust removal system for a cleaning vehicle according to any one of claims 1 to 8, characterized by, The method comprises the following steps: The control unit controls the fan to adjust to the corresponding negative pressure suction intensity according to the control signal output by the human-computer interaction unit; The first dust-containing air is input into the first dust collection cavity (4) through the dust suction assembly (1), and after primary dust removal, first dust particles and second dust-containing air are obtained, and the first dust particles are settled in the first dust collection cavity (4); The second dust-containing air is input into the dust removal assembly through the dust inlet (8), and after secondary dust removal, second dust particles and third dust-containing air are obtained, the second dust particles are discharged into the second dust collection cavity (5) through the second dust outlet, and the third dust-containing air is discharged into the air guide pipe (2) through the third dust outlet (9).

10. A sweeper characterized by The dust removal system for the cleaning vehicle comprises the dust removal system for the cleaning vehicle according to any one of claims 1-8.

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