Controlled Dust Exhaust Device

Abstract

The present invention relates to a controlled dust exhaust device. The controlled dust exhaust device is used to exhaust dust in a dust suction vehicle, and the controlled dust exhaust device includes: a controlled conveying mechanism having a conveying starting end and a conveying ending end adjacent to a dust exhaust port of the dust suction vehicle; and a cover that is openably and closably mounted to the dust exhaust port.

Description

Technical Field

[0001] The present invention relates to the technical field of cleaning machinery, and particularly to a controlled dust exhaust device. Background Art

[0002] With the enhancement of people's environmental protection awareness, the performance requirements for road cleaning machinery are getting higher and higher. People not only hope that they can efficiently complete the cleaning operation, but also hope to reduce the secondary pollution to the surrounding environment caused by dust during the unloading of garbage or materials. For this reason, a large amount of research has been carried out.

[0003] For example, the Chinese patent application for invention CN103614980A titled "A Dust Suppression Device for Unloading of a Pure Suction Road Sweeper" published on March 5, 2014, proposes a solution to reduce dust by physical isolation. The dust suppression device for unloading of a pure suction road sweeper mainly includes: a hinge support, a box body, and a discharge port, and is characterized by further including: a moving push rod, an inner rotating bracket, a rotating bracket mounting frame, a discharge guiding ramp, an isolation cover, a rotating bracket movement limiting chain, and an outer rotating bracket. The connection mode is as follows: the moving push rod is respectively connected to the box body and the outer rotating bracket through the hinge support, the outer rotating bracket and the inner rotating bracket are connected to the rotating bracket mounting frame, the isolation cover is connected to the inner rotating bracket and the outer rotating bracket, the discharge guiding ramp is connected to the box body and the rotating bracket mounting frame, the inner rotating brackets are connected to each other through the rotating bracket movement limiting chain, the discharge port is connected to the box body, and the inner rotating bracket and the outer rotating bracket are connected through the rotating bracket movement limiting chain. During unloading, the isolation cover can be unfolded by controlling the movement of the moving push rod to isolate the material from the outside. This application claims to solve the problem of dust generation during unloading and significantly improve the cleaning and environmental protection characteristics of the suction vehicle. However, this physical isolation solution has problems such as large floor area, complex structure, and difficulty in cleaning the discharge guiding ramp and the isolation cover itself. Especially when cleaning on some narrow urban roads, the problems of floor area occupation and cleaning are more prominent.

[0004] For another example, the Chinese utility model patent application CN206428630U titled "A Dust Suppression Device for a Vacuum Cleaner Truck" published on August 22, 2017, proposed a solution to reduce dust by humidification. The dust suppression device of the vacuum cleaner truck includes a spray device, a water tank, a water pump, and a controller; the spray device is installed at the rear door of the vacuum cleaner truck, and it is provided with a plurality of high-pressure nozzles, and the spray directions of the high-pressure nozzles all face the outer end surface of the rear door of the truck; the water tank and the water pump are both arranged in the carriage of the vacuum cleaner truck, the input end of the water pump is connected to the water tank through a pipeline, and its output end is connected to the spray device through a pipeline, and the controller is installed in the cab of the vacuum cleaner truck and is electrically connected to the water pump. This application claims its advantages as: simple structure, convenient installation, can effectively suppress the dust during the unloading of garbage by the vacuum cleaner truck, and avoid the occurrence of secondary pollution. However, the problem with this solution is that it is easy to make the inside and outside of the carriage either muddy or the dust caking and adhering to the vacuum cleaner truck after drying, which is not easy to clean. When the environment is relatively dry, frequent water replenishment is required to achieve the claimed effect of this application, which is easy to cause waste of water resources. When it comes to a relatively cold environment, this solution is prone to icing and other situations, making it difficult to operate.

[0005] For another example, the Chinese utility model patent application CN210621589U titled "A Discharge Guiding Mechanism for a Vacuum Cleaner Truck Body That Can Be Freely Adjusted" published on May 26, 2020, proposed another solution to reduce dust by physical isolation. The discharge guiding mechanism for the vacuum cleaner truck body that can be freely adjusted includes a box body, a discharge guiding plate, and a driving device. The discharge guiding plate is rotatably connected to the bottom edge of the tail of the box body through a pin shaft, and the driving device drives the discharge guiding plate to rotate around the central axis of the pin shaft at its connection point. The discharge guiding plate can be rotated to contact the ground or abut against the rear panel of the tail of the box body. This application claims its beneficial effects as: adding a retractable discharge guiding mechanism at the discharge port, so as to realize the correct flow of the garbage at the discharge port into the garbage pool, ensure the cleanliness around the garbage pool, and can effectively improve the docking and adaptation function with other sanitation trucks. It can effectively improve the functions of discharging and suppressing dust, can effectively improve the working efficiency of the vacuum cleaner truck, and can also retract the discharge guiding plate when not in use. In addition, when driving during opening and encountering obstacles on the road surface, the discharge guiding plate can also be retracted to avoid obstacles. However, the problem with this solution is that it occupies a large area and cannot block the dust generated in the carriage during the unloading process.

[0006] This background technology is only for facilitating the understanding of the related technologies in this field and is not regarded as an admission of the prior art. Summary of the Invention

[0007] The present invention aims to provide a controlled dust discharge device that solves at least some of the above technical problems.

[0008] The present invention also aims to provide a rear door assembly of a dust suction vehicle applying the above improved controlled dust discharging device.

[0009] According to one aspect of the present invention, there is provided a controlled dust discharging device for discharging dust in a dust suction vehicle. The controlled dust discharging device includes: a controlled conveying mechanism having a conveying starting end and a conveying ending end adjacent to the dust discharging port of the dust suction vehicle; and a cover openably and closably mounted to the dust discharging port.

[0010] With the controlled dust discharging device of the present invention, another option is provided for discharging the contents of the dust suction vehicle, that is, without opening the unloading port of the dust suction vehicle, opening the cover of the dust discharging port, and transporting sundries such as dust in the dust suction vehicle to the conveying ending end through the controlled dust discharging device and discharging it through the dust discharging port. A collecting device can be provided at the dust discharging port to collect the discharged dust. The controlled dust discharging device can be manually controlled to perform actions such as feeding, retracting, and stopping, so that the dust can be discharged orderly under a controlled state without being randomly diffused into the atmosphere to cause secondary pollution.

[0011] In some embodiments, the conveying mechanism includes: a driving mechanism; a rotating shaft connected to the driving mechanism; and a spiral pushing blade mounted on the rotating shaft. This kind of conveying mechanism has a simple structure and is easy to implement.

[0012] In some embodiments, the dust discharging port is provided on one side of the rear door, the rotating shaft is connected with a spiral pushing blade, and the spiral pushing blade continuously spirally extends from one end of the rotating shaft to the other end to be adjacent to the dust discharging port. In this way, the conveying starting end of the conveying mechanism is located on one side, while the conveying ending end is located on the other side. The spiral pushing blade pushes the dust from one side to the other side and then discharges it through the dust discharging port. The device has a simple structure and is easy to operate. In this embodiment, the dust discharging port can be provided on one side of the rear door, which basically has no impact on the overall surface and the original structure of the dust suction vehicle.

[0013] In some embodiments, the dust discharging port is provided in the middle of the rear door, and a pair of spiral pushing blades are oppositely connected to the rotating shaft with opposite spiral directions. In this way, the conveying starting ends of the conveying mechanism are located on both sides, while the conveying ending end is located in the middle. The two spiral pushing blades push the dust from both sides to the middle and then discharge it through the dust discharging port. The device has a simple structure and is easy to operate. In this embodiment, the dust discharging port can be provided in the middle of the rear door, which basically has no impact on the overall surface and the original structure of the dust suction vehicle.

[0014] In some embodiments, the cover is pivotable, and the controlled dust exhaust device further includes an opening and closing mechanism drivingly connected to the cover. The controlled opening or closing of the cover can prevent dust from being inadvertently released and diffused from the dust exhaust port. The pivotable cover can be pressed against the dust exhaust port when fastened, thereby effectively sealing the dust exhaust port. The pivotable structure enables the cover to be more easily pressed tightly against the dust exhaust port, preventing dust from overflowing from the dust exhaust port. The opening and closing mechanism cooperates with the pivotable cover, with a simpler structure and better sealing effect, further preventing fine dust particles from overflowing.

[0015] In some embodiments, the opening and closing mechanism includes: a controlled linear motion mechanism; and a connecting rod connected to the cover and hinged to the linear motion mechanism. The linear motion mechanism can be, for example, a push rod motor. Driven by the linear motion mechanism, the connecting rod drives the cover to pivot to open or close the dust exhaust port, and the connecting rod can press the cover more tightly against the dust exhaust port, with a better sealing effect. This opening and closing mechanism has a simple structure and can effectively operate the cover to cover the dust exhaust port.

[0016] According to another aspect of the present invention, there is provided a rear door assembly for a dust suction vehicle, including: a rear door formed with a dust exhaust port; and at least one controlled dust exhaust device mounted to the rear door, the controlled dust exhaust device being the aforementioned controlled dust exhaust device. The rear door assembly of the dust suction vehicle according to the present invention can be integrally pivotally connected to the dust suction vehicle body. In the traditional dumping mode, the rear door opens the vehicle body and together with the vehicle body defines a discharge port for dumping garbage and other sundries. In cases where it is necessary to prevent dust diffusion, the rear door is closed but the dust exhaust port is open, and the controlled dust exhaust device sends the dust to the dust exhaust port and discharges it through the dust exhaust port. Through the rear door assembly of the dust suction vehicle according to the present invention, the discharging method of the contents of the dust suction vehicle is more flexible, can effectively avoid dust emission, and has a simple structure and is easy to implement.

[0017] According to still another aspect of the present invention, there is provided a rear door assembly for a dust suction vehicle, including: a rear door having a first dust exhaust port formed in its lower region and a second dust exhaust port formed in its upper region; a controlled first conveying mechanism mounted to the lower region of the rear door corresponding to the first dust exhaust port; a first cover openably and closably mounted to the first dust exhaust port; a controlled second conveying mechanism mounted to the upper region of the rear door corresponding to the second dust exhaust port; and a second cover openably and closably mounted to the second dust exhaust port.

[0018] The rear door assembly of the dust suction vehicle of the present invention can be pivotally connected to the dust suction vehicle body as a whole. In the traditional dumping mode, the rear door opens the vehicle body and together with the vehicle body defines a discharge port for dumping garbage and other sundries. In the case where it is necessary to prevent the spread of dust, the rear door is closed and the covers of the first dust discharge port and the second dust discharge port are opened, allowing the first conveying mechanism and the second conveying mechanism to send the dust to the dust discharge port for discharge. The first conveying mechanism and the second conveying mechanism can be manually controlled to perform actions such as feeding, retracting, and stopping, so that the dust can be discharged orderly under a controlled state without being randomly diffused into the atmosphere to cause secondary pollution. The two dust discharge ports correspond to the positive pressure chamber and the negative pressure chamber respectively, and the dust in the two chambers is discharged separately to prevent the dust in the two chambers from mixing. The first conveying mechanism and the second conveying mechanism can move synchronously or can be independently controlled to move. In this way, the discharge mode of the dust in the vehicle body is more flexible and easy to operate, and further reduces the dust emission.

[0019] In some embodiments, each of the first conveying mechanism and the second conveying mechanism includes: a driving mechanism mounted to the rear door; a rotating shaft connected to the driving mechanism; and a spiral pushing blade mounted to the rotating shaft.

[0020] In some embodiments, the first dust discharge port is disposed in the middle of the rear door, and the first conveying mechanism includes a pair of spiral pushing blades connected to its rotating shaft relatively and with opposite rotation directions. In this way, the starting end of the conveying mechanism is located on both sides, and the ending end of the conveying is located in the middle. The two spiral pushing blades push the dust from both sides to the middle and then discharge it from the dust discharge port. The device structure is simple and easy to operate. In this embodiment, the dust discharge port can be arranged in the middle of the rear door, which basically has no impact on the overall surface and the original structure of the dust suction vehicle.

[0021] In some embodiments, the second dust discharge port is disposed on one side of the rear door, and the second conveying mechanism includes a spiral pushing blade connected to its rotating shaft and continuously spirally extending from one end of the rotating shaft to the other end to approach the second dust discharge port. In this way, the starting end of the conveying mechanism is located on one side, and the ending end of the conveying is located on the other side. The spiral pushing blade pushes the dust from one side to the other side and then discharges it from the dust discharge port. The device structure is simple and easy to operate. In this embodiment, the dust discharge port can be arranged on one side of the rear door, which basically has no impact on the overall surface and the original structure of the dust suction vehicle.

[0022] In some embodiments, at least one of the first cover and the second cover is pivotally mounted on the rear door and connected to an opening and closing mechanism. The pivotable cover is more easily pressed tightly against the corresponding dust discharge port to prevent the dust from overflowing from the dust discharge port. The opening and closing mechanism cooperates with the pivotable cover, and the structure is simpler and the sealing effect is better.

[0023] In some embodiments, the opening and closing mechanism includes: a controlled linear motion mechanism mounted to the rear door; and a connecting rod hinged to the linear motion mechanism and connected to a corresponding cover. Such an opening and closing mechanism has a simple structure and can effectively operate the cover to cover the corresponding dust exhaust port.

[0024] In some embodiments, the rear door is pivotally mounted to define an openable and closable discharge port of the dust collection suction vehicle. In this way, the unloading method of the dust collection suction vehicle is more flexible. It is possible to keep the box body of the dust collection suction vehicle horizontal, close the rear door, open the dust exhaust port, and discharge the dust in a non-dusty manner. It is also possible to lift the front end of the box body and open the rear door to unload the dust in a dumping manner.

[0025] In some embodiments, the rear door is provided with an observation window for observing the interior of the suction vehicle. The observation window includes an observation opening and a lid that is openably and closably mounted to the observation opening.

[0026] In some embodiments, the rear door includes a rear door panel forming an upper groove, a lower groove, and a partition between the upper groove and the lower groove. The first conveying mechanism is installed in the lower groove, and the second conveying mechanism is installed in the upper groove. The position of the partition corresponds to the position of the baffle between the positive pressure chamber and the negative pressure chamber of the box body of the dust collection suction vehicle. When the rear door is closed, the partition can be joined with the baffle between the positive pressure chamber and the negative pressure chamber to form an integral isolation board, realizing the isolation of the two compartments of the box body, preventing the positive pressure chamber and the negative pressure chamber from communicating, and also preventing the dust in the positive pressure chamber and the negative pressure chamber from mixing.

[0027] In some embodiments, at least one of the first dust exhaust port and the second dust exhaust port is connected to a dust exhaust pipe. The dust exhaust pipe defines a movement path for the dust discharged from the dust exhaust port. Further, a collection device, such as a collection bag, can be joined to the dust exhaust pipe. In one embodiment, the collection bag can be detachably connected to the dust exhaust pipe. In another embodiment, the collection bag can be self-sealing, for example, self-sealing when detached from the dust exhaust pipe. Alternatively, at least one of the collection bag and the dust exhaust pipe is provided with a quick-release and quick-installation structure for connecting the collection bag to the dust exhaust pipe and detaching it from the dust exhaust pipe. The dust is discharged from the dust exhaust port through the dust exhaust pipe and collected by the collection device, preventing the dust from spreading into the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, wherein:

[0029] Figure 1 is a schematic diagram of a dust collection suction vehicle according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the box body of a dust collection suction vehicle according to an embodiment of the present invention;

[0031] Figure 3 is a schematic view of the rear door assembly of a dust collection and suction vehicle according to an embodiment of the present invention;

[0032] Figure 4 is a side view of the rear door assembly of a dust collection and suction vehicle according to an embodiment of the present invention;

[0033] Figure 5 is a schematic view of the cover and opening / closing mechanism of the rear door assembly of a dust collection and suction vehicle according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1. Dust collection and suction vehicle; 2. Compartment; 21. Front wall; 22. Rear wall; 23. Top wall; 24. Bottom wall; 25. Partition; 26. Positive pressure chamber; 27. Negative pressure chamber; 29: Baffle; 31. Filter part; 32. Filter part; 4. Rear door assembly; 41. Rear door; 411. Rear door panel; 412. Side panel; 413. Sealing plate; 414. Partition; 415. First dust discharge port; 416. Second dust discharge port; 417. Partition; 42. First dust discharge device; 421. First conveying mechanism; 4211. First driving mechanism; 4212. First rotating shaft; 4213. First spiral pushing blade; 4214. Second spiral pushing blade; 422. First cover; 423. First opening / closing mechanism; 4231. First push rod motor; 4232. First connecting rod; 4233. Bracket; 43. Second dust discharge device; 431. Second conveying mechanism; 4311. Second driving mechanism; 4312. Second rotating shaft; 4313. Third spiral pushing blade; 432. Second cover; 433. Second opening / closing mechanism; 4331. Second push rod motor; 4332. Second connecting rod; 44. Hydraulic pipeline; 45. Observation window; 451. Observation port; 452. Lid. 46. Rear door actuating mechanism; 6. Negative pressure source; 61. Air inlet; 7. Suction pipe; 8. Chassis. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the detailed implementation manners and the accompanying drawings. Herein, the illustrative implementation manners of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0037] Figure 1 shows a schematic cross-sectional view of a dust collection and suction vehicle according to an embodiment of the present invention, Figure 2 schematically shows in a partial view Figure 1The dust collection and suction truck, in which the cab and the chassis are omitted. As shown in the figure, the dust collection and suction truck 1 includes a movable chassis 8 and a body 2 mounted on the chassis 8. The front end of the body 2 near the cab can be lifted (for example, lifted by an oil cylinder or jacked up by a jack) to facilitate the unloading of garbage or the discharge of dust from the rear end of the body 2 away from the cab. In the body 2, a positive pressure chamber 26 and a negative pressure chamber 27 are separated by a baffle 29. For example, a negative pressure source 6 in the form of a fan is mounted on the body 2. The air inlet 61 of the negative pressure source 6 is in fluid communication with the negative pressure chamber 27 to suck gas from the negative pressure chamber 27, and the air outlet 62 of the negative pressure source 6 is in fluid communication with the positive pressure chamber 26 to discharge gas into the positive pressure chamber 26. The positive pressure chamber 26 may be provided with an exhaust port communicating with the atmosphere or connected to an exhaust port communicating with the atmosphere provided at other positions of the body 2. One end of the suction pipe 7 extends into the negative pressure chamber 27, and the other end extends downward and is connected to a cleaning and suction device (not shown in the figure) to facilitate the road suction and cleaning operation. The cleaning and suction device may include a purging port communicating with another air outlet of the negative pressure source, a cleaning brush, and a suction port communicating with the negative pressure chamber. In some embodiments, the suction port is in communication with the negative pressure chamber 27 of the body 2 through the suction pipe 7, and can suck and collect dust, garbage, etc. on the road surface. In some embodiments, the purging port is in communication with another air outlet (not shown in the figure) of the negative pressure source 6 through a duct. This other air outlet of the negative pressure source 6 is located between the air inlet 61 and the air outlet 62 of the negative pressure source 6. The purging port can be arranged to spray gas towards the suction port to blow dust, garbage, etc. on the road surface towards the suction port, which helps the suction port to complete the suction cleaning operation more efficiently.

[0038] As Figure 2 shown, in one embodiment, the body 2 is surrounded by a plurality of side walls, and the plurality of side walls include a top wall 23, a front wall 21 connected to the top wall 23 at one end of the top wall 23 near the cab, and a rear wall 22 connected to the top wall 23 at one end of the top wall 23 near the rear of the vehicle. The front wall 21 and the rear wall 22 are relatively spaced apart. A vertically arranged partition 25 is connected to the top wall 23 and is located between the front wall 21 and the rear wall 22. A bottom wall 24 opposite to the top wall 23 is connected between the partition 25 and the rear wall 22. In this way, the top wall 23, the partition 25, the bottom wall 24, and the rear wall 22 jointly enclose the collection space of the body 2, and the top wall 23, the front wall 21, and the partition 25 enclose an open space communicating with the atmosphere. The baffle 29 is arranged in the collection space and is connected between the front wall 21 and the rear wall 22. Thus, the baffle 29 divides the collection space into a lower negative pressure chamber 27 and an upper positive pressure chamber 26.

[0039] In one embodiment, the negative pressure source 6 can be installed on the box body 2, and the air inlet 61 of the negative pressure source 6 is connected to the negative pressure chamber 27 through the opening of the baffle 29. The negative pressure source 6 can be, for example, a blower. By driving the blower impeller to rotate at a high speed, the negative pressure chamber 27 of the box body 2 is pumped into a certain degree of vacuum, and dust, garbage, etc. are sucked into the negative pressure chamber 27 through the suction pipe 7. After entering the negative pressure chamber 27, due to sudden pressure increase, the air flow velocity slows down, and most of the substances with larger mass in the inhaled matter settle down under the action of gravity, realizing the first rough separation of air and dust, while some fine dust is sucked into by the blower impeller. Under the high-speed rotation of the impeller, the dust obtains energy and is thrown into the casing of the blower at a certain speed and pressure. The dust makes a high-speed circular motion in the casing. According to the centrifugal force formula: F = mωv (centrifugal force = mass × angular velocity × linear velocity), it shows that: at the same speed, the larger the mass, the greater the centrifugal force obtained. Because the mass of the dust is much larger than that of the air, the dust moves closer to the edge of the casing, so that the dust and the gas are separated, realizing the second fine separation of air and dust. The separated fine dust is thrown into the positive pressure chamber 26 of the box body 2 under the action of inertia force and settles down, while the separated gas enters the blowing port of the cleaning and dust suction device along the air guide pipe. The air flow sprays out from the blowing port to blow the ground dust and sundries towards the suction pipe 7, and then is sucked up by the suction pipe 7 and enters the negative pressure chamber 27 of the box body 2. In this cycle, the purpose of sucking up the ground sundries and dust is achieved.

[0040] In one embodiment, a pressurizing mechanism (not shown in the figure) is also installed on the side of the impeller in the casing of the blower, and the pressurizing mechanism is used to pressurize the gas flowing out of the other air outlet of the blower and make it enter the air guide pipe at a high speed. In one embodiment, the pressurizing mechanism can be a flow guiding ring, and the flow guiding ring can be circular, and is composed of two upper and lower circular steel plates with a certain taper and several intermediate flow guiding vanes. In the rotational motion of the air flow, the flow guiding vanes can make the air flow change from circular motion to radial motion and increase the air flow pressure, so as to pass through the air guide pipe at a high speed and spray out from the blowing port of the cleaning and dust suction device.

[0041] To prevent the inhaled substances from damaging the negative pressure source 6, in one embodiment, a filtering part 31 can be provided at the opening of the baffle 29 communicating with the air inlet 61. The filtering part 31 can be, for example, a grid plate or a grating plate.

[0042] In some embodiments, the end of the suction pipe 7 extends into the negative pressure chamber 27, and the extending end is configured in a parabolic curve configuration. Thereby, the substances with larger mass in the inhaled matter will move in the negative pressure chamber 27 along a parabolic trajectory until they fall on the bottom wall 24, preventing impact on the rear wall 22 and the rear door 41 of the box body 2, and at the same time reducing the impact on the bottom wall 24. The parabolic curve configuration parameters of the extending end of the suction pipe 7 satisfy that the parabolic motion trajectory of the object avoids the baffle 29 and the rear wall 22.

[0043] According to the dust collection and suction vehicle of the present invention, the cleaning cycle of the whole vehicle is completed entirely by airflow. With the help of the cooperation between the fan and the positive pressure cabin and the negative pressure cabin, the airflow entering the vehicle through the cleaning and suction device circulates at high speed in a closed channel with almost no gas leakage. Because the dust is always entrained by the airflow, it will not cause dust problems. Due to the use of the combined blowing and suction method, it is equivalent to utilizing the total pressure generated when the impeller is working (negative pressure of suction, positive pressure of blowing), which not only increases the cleaning width, but also saves a lot of energy. Because it is a dry suction type, there is no need to spray water, which saves water resources, and the northern winter can operate as usual (no water, no fear of ice). Therefore, the dust collection and suction vehicle according to the present invention can be used in places with a lot of dust and debris, and can effectively remove ground dust without causing secondary dust. The content of inhalable particulate matter in the air is reduced, the environment is protected, and the urban sanitation level is improved. Through the circulation of airflow in the fan, positive pressure cabin, and negative pressure cabin, only a small part of the gas is discharged from the exhaust port of the compartment. The exhaust volume of the exhaust port of the compartment only accounts for 10%-30% of the air intake of the gas sucked in by the air purification device and the cleaning and dust collection device, that is, the exhaust volume of the dust collection truck only accounts for 10%-30% of the air intake of the whole vehicle, and 70%-90% of the air intake of the dust collection truck is used for its own cleaning operation and circulates in a closed loop, achieving the effect of only a small amount of gas emission, and the emitted gas is also filtered clean air, which effectively solves the problem of environmental pollution caused by large amount of gas emission from dust collection trucks.

[0044] refer to Figures 3 to 5 , the rear door assembly 4 is mounted on the rear wall 22. The rear door assembly 4 can be pivoted as a whole to open or close the collection space of the compartment 2. When the front end of the compartment 2 rises and the rear door assembly 4 pivots to open the collection space of the compartment 2, a discharge outlet is defined between the rear door 41 of the rear door assembly 4 and the compartment 2, and the garbage in the compartment 2 can be discharged in a dumping manner. When the front end of the compartment 2 rises and the rear door assembly 4 still closes the collection space of the compartment 2, the dust deposited in the positive pressure cabin 26 and the negative pressure cabin 27 can be discharged in an independently controllable and almost dust-free manner by relying on the rear door assembly 4, avoiding secondary pollution to the air.

[0045] In the illustrated embodiment, the rear door assembly 4 includes a rear door 41, a first dust exhaust device 42, and a second dust exhaust device 43. The rear door 41 is mounted on the rear wall 22 through a pivot shaft, and a rear door actuating mechanism 46 is connected between the rear wall 22 and the rear door 41 to control the rear door 41 to flip open or close the collection space of the box body 2. The rear door actuating mechanism 46 can be a telescopic mechanism, such as a piston cylinder. One end of the piston cylinder is hinged on the rear wall 22, and the other end is hinged on the rear door 41. The rear door 41 is driven to flip by the extension or retraction of the piston rod. In one embodiment, the piston cylinder is an oil cylinder. In the illustrated embodiment, the rear door 41 can have a groove. In one embodiment, the rear door 41 includes a rear door panel 411 and a plurality of (e.g., 4) side plates 412 connected to the periphery of the rear door panel 411. The rear door panel 411 and the side plates 412 jointly enclose a mounting groove for mounting the first dust exhaust device 42 and the second dust exhaust device 43.

[0046] As Figure 3 and Figure 4 shown, the rear door 41 is formed with a first dust exhaust port 415 in the lower region corresponding to the negative pressure chamber 27, and a second dust exhaust port 416 in the upper region corresponding to the positive pressure chamber 26. The first dust exhaust device 42 is installed corresponding to the first dust exhaust port 415, and is used to controllably send the dust deposited in the negative pressure chamber 27 to the first dust exhaust port 415 and discharge it through the first dust exhaust port 415 for collection. The second dust exhaust device 43 is installed corresponding to the second dust exhaust port 416, and is used to controllably send the dust deposited in the positive pressure chamber 26 to the second dust exhaust port 416 and discharge it through the second dust exhaust port 416 for collection.

[0047] In the illustrated embodiment, the first dust exhaust device 42 includes a first conveying mechanism 421, a first cover 422, and a first opening and closing mechanism 423. The first cover 422 is movably installed at the first dust exhaust port 415 to open or close the first dust exhaust port 415. The movable manner of the first cover 422 can be pivoting or translation. In the illustrated embodiment, the first cover 422 is installed at the first dust exhaust port 415 through a pivot shaft, and the first opening and closing mechanism 423 is connected to the first cover 422 and controls the pivoting of the first cover 422. In one embodiment, the first opening and closing mechanism 423 includes a first push rod motor 4231 and a first connecting rod 4232, wherein the first push rod motor 4231 is hinged on the rear door panel 411 of the rear door 41, and one end of the first connecting rod 4232 is hinged to the first push rod motor 4231, and the other end is connected to the first cover 422. Alternatively, the first push rod motor can be replaced by other linear motion mechanisms that can be controlled to perform linear motion. As shown in the figure, a bracket 4233 can be provided at the first dust exhaust port 415, and the first cover 422 is hinged on the bracket 4233. The connecting rod helps to press the first cover against the first dust exhaust port to prevent dust leakage. In an embodiment not shown, the first cover 422 can also be manually controlled to open and close.

[0048] In the illustrated embodiment, the first conveying mechanism 421 is disposed in the installation groove of the rear door 41 corresponding to the negative pressure chamber 27. The conveying start end of the first conveying mechanism 421 is far from the first dust exhaust port 415, while the conveying end of the first conveying mechanism 421 points to or is close to the first dust exhaust port 415, so as to convey the dust towards the first dust exhaust port 415 and discharge it. As shown in the figure, the first conveying mechanism 421 includes a first driving mechanism 4211 installed on the rear door 41, a first rotating shaft 4212 connected to the first driving mechanism 4211, a first spiral pushing blade 4213 and a second spiral pushing blade 4214 extending spirally on the outer periphery of the first rotating shaft 4212. The first spiral pushing blade 4213 and the second spiral pushing blade 4214 are arranged oppositely and have opposite spiral directions on the first rotating shaft 4212. In one embodiment, the first dust exhaust port 415 is centrally disposed in the lower region of the rear door panel 411, and the first spiral pushing blade 4213 and the second spiral pushing blade 4214 can push the dust from both sides of the rear door towards the middle to be discharged from the first dust exhaust port 415. According to an embodiment of the present invention, the first conveying mechanism 421 has two conveying start ends on opposite sides of the rear door and a central conveying end.

[0049] In an embodiment not shown, the first controlled dust exhaust device may further include another set of conveying mechanisms disposed at an angle (such as 90 degrees) with the first conveying mechanism. This another set of conveying mechanisms can extend from the inside of the negative pressure chamber 27 of the box body 2 to the conveying start end of the first conveying mechanism. Similar to the first conveying mechanism, this another set of conveying mechanisms is provided with a driving mechanism, a rotating shaft, and spiral pushing blades for pushing the dust in the negative pressure chamber to the start end of the first conveying mechanism, and then the first conveying mechanism pushes the received dust to the first dust exhaust port.

[0050] In one embodiment, the first driving mechanism 4211 is connected to the hydraulic pipeline 44 and is hydraulically controlled. Such a first driving mechanism 4211 can be a hydraulic motor. The first driving mechanism 4211 is controlled to start or stop the rotation of the first rotating shaft 4212, thereby controlling the first blade 4213 and the second blade 4214 to discharge dust towards the first dust exhaust port 415 or stop discharging dust.

[0051] In one embodiment, a first dust exhaust pipe can be sleeved on the first dust exhaust port 415, and the dust can move along the first dust exhaust pipe after being discharged from the first dust exhaust port. The first dust exhaust pipe can be connected with a collection device such as a collection bag. The collection device can be detachably connected to the first dust exhaust pipe. The collection device can also be self-sealing. At least one of the first dust exhaust pipe and the collection device can be provided with a quick-installation and quick-disassembly structure.

[0052] In the illustrated embodiment, the second dust exhausting device 43 includes a second conveying mechanism 431, a second cover 432, and a second opening and closing mechanism 433. The second cover 432 is movably installed at the second dust exhaust port 416 to open or close the second dust exhaust port 416. The movable manner of the second cover 432 may be pivoting or translation. In the illustrated embodiment, the second cover 432 is installed at the second dust exhaust port 416 through a pivot shaft, and the second opening and closing mechanism 433 is connected to the second cover 432 and controls the pivoting of the second cover 432. As Figure 5 shown, in one embodiment, the second opening and closing mechanism 433 includes a second push rod motor 4331 and a second connecting rod 4332. The second push rod motor 4331 is hinged to the rear door panel 411 of the rear door 41, and one end of the second connecting rod 4332 is hinged to the second push rod motor 4331, and the other end is connected to the second cover 432. Alternatively, the second push rod motor may be replaced with other linear motion mechanisms that can be controlled to perform linear motion. The connecting rod helps to press the second cover against the second dust exhaust port to prevent dust leakage. In an embodiment not shown, the second cover 432 may also be manually controlled to open and close.

[0053] In the illustrated embodiment, the second conveying mechanism 431 is disposed in the installation groove of the rear door 41 corresponding to the positive pressure chamber 26. The conveying start end of the second conveying mechanism 431 is far from the second dust exhaust port 416, and the conveying end of the second conveying mechanism 431 points to or is close to the second dust exhaust port 416 to realize conveying and discharging the dust toward the second dust exhaust port 416. As shown, the second conveying mechanism 431 includes a second driving mechanism 4311 installed on the rear door 41, a second rotating shaft 4312 connected to the second driving mechanism 4311, and a third spiral pushing blade 4313 spirally extending on the outer periphery of the second rotating shaft 4312. The spiral direction of the third spiral pushing blade 4313 is designed to be able to push the dust toward the second dust exhaust port 416. In one embodiment, the second dust exhaust port 416 is formed on one side of the upper region of the rear door panel 411, and the third spiral pushing blade 4313 can push the dust from one side of the rear door to the other side to be discharged from the second dust exhaust port. According to an embodiment of the present invention, the second conveying mechanism 431 has a conveying start end on one side of the rear door 41 and a conveying end on the opposite side of the rear door.

[0054] In an embodiment not shown, the second controlled dust exhausting device may further include another set of conveying mechanisms that form an angle (such as 90 degrees) with the second conveying mechanism. This another set of conveying mechanisms can extend from the inside of the positive pressure chamber 26 of the box body 2 to the conveying start end of the second conveying mechanism. This another set of conveying mechanisms is similarly provided with a driving mechanism, a rotating shaft, and a spiral pushing blade for pushing the dust in the positive pressure chamber to the start end of the second conveying mechanism, and then the second conveying mechanism pushes the dust to the second dust exhaust port.

[0055] In one embodiment, the second driving mechanism 4311 is connected to the hydraulic pipeline 44 and controlled by hydraulic pressure. Such a second driving mechanism 4311 can be a hydraulic motor. The second driving mechanism 4311 is controlled to start or stop the rotation of the second rotating shaft 4312, thereby controlling the third blade 4313 to discharge dust to the second dust discharge port 416 or stop discharging dust.

[0056] As Figure 3 shown, in one embodiment, a partition 417 is connected between two left and right opposite side plates 412. The partition 417 divides the installation groove of the rear door 41 into an upper groove and a lower groove. The first conveying mechanism 421 can be installed in the lower groove, while the second conveying mechanism can be installed in the upper groove. The partition 417 is installed corresponding to the position of the baffle 29. When the rear door 41 is closed, the partition 417 can be hermetically engaged or abutted against the baffle 29 to prevent the positive pressure chamber and the negative pressure chamber from communicating. In addition, the two separated grooves also facilitate the installation and control of the two conveying mechanisms respectively.

[0057] As Figure 3 shown, in one embodiment, a partition 414 is connected between two upper and lower opposite side plates 412. A space for installing the first driving mechanism 4211 and the second driving mechanism 4311 is formed between the partition 414 and one side plate 412. This helps with the wiring of the hydraulic pipeline 44 and connecting it to the two driving mechanisms. The hydraulic pipeline 44 can be provided with control valves to achieve synchronous or independent control of the first driving mechanism and the second driving mechanism.

[0058] In one embodiment, a second dust discharge pipe can be sleeved on the second dust discharge port 416. After the dust is discharged through the second dust discharge port, it can move along the second dust discharge pipe. The second dust discharge pipe can be connected with a collection device such as a collection bag. The collection device can be detachably connected to the second dust discharge pipe. The collection device can also be self-sealing. At least one of the second dust discharge pipe and the collection device can be provided with a quick installation and disassembly structure.

[0059] In the illustrated embodiment, in order to facilitate the control of the dust discharge operations of the first dust discharge device 42 and the second dust discharge device 43, an observation window 45 can be provided on the rear door 41. The observation window 45 can be provided with an observation port 451 that is through or has a transparent shield, and a lid 452 that can move to open or close the observation port 451. The movement mode of the lid 452 can be translational or pivotal. The lid 452 can be manually opened and closed or controlled to open and close through a motion control mechanism.

[0060] According to the dust collection and suction truck of the present invention, the controlled dust discharging device operates in a controllable manner within the closed compartment. Multiple controlled dust discharging devices can be independently controlled or synchronously controlled. The first conveying mechanism 421 and the second conveying mechanism 431 each send dust to the first dust discharging port and the second dust discharging port, and independently control the opening of the first cover 422 and the second cover 432 to perform the dust discharging operation. The dust is discharged and collected through the first dust discharging port and the second dust discharging port, which can effectively prevent the dust in the compartment 2 from being disorderly discharged into the atmosphere to cause dust pollution. The collected dust can also be used for other purposes, such as being used as raw materials for firing pottery. In some embodiments, a linkage mechanism can be provided between the first conveying mechanism 421 and the first cover 422. For example, in one embodiment, the linkage mechanism is configured to lock the first conveying mechanism 421 when the first cover 422 is closed, such as closing the driving mechanism of the first conveying mechanism, so that the first conveying mechanism 421 cannot be controlled to start. When the first cover 422 is opened, the linkage mechanism unlocks the first conveying mechanism 421, such as unlocking the driving mechanism of the first conveying mechanism, so that it can be controlled to start. In other embodiments, a similar linkage mechanism can be provided between the second conveying mechanism 431 and the second cover 432. The linkage mechanism can prevent misoperation of the conveying mechanism when the cover is closed, ensuring the safe progress of the dust discharging operation. The rear door assembly integrated with the controlled dust discharging device can achieve flexible operation of the dust collection and suction truck. It is possible to choose not to activate the controlled dust discharging device. At this time, the rear door is flipped open to unload the dust from the carriage. It is also possible to choose to activate the controlled dust discharging device to enable the dust to be discharged and collected in an orderly manner, effectively avoiding environmental damage such as dust pollution.

[0061] In this document, multiple embodiments of the present invention are described. However, for the sake of brevity, the descriptions of each embodiment are not exhaustive, and the same or similar features or parts between the various embodiments may be omitted. In this document, "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean applicable to at least one embodiment or example according to the present invention, rather than all embodiments. And the above terms do not necessarily mean referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics of each embodiment can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0062] In this document, the terms "comprising", "including" or variations thereof are intended to be inclusive, not exclusive, such that a process, method, product or apparatus that includes a series of elements may include those elements and may also include other elements not expressly listed. For the purposes of disclosure and unless otherwise specified, "a" means "one or more". As used in this specification and the claims, the term "comprising" or "comprises" will be non-exhaustive, somewhat similar to "including", in that those terms are interpretive when used as transitional connectives.

[0063] The exemplary systems and methods of the present invention have been specifically shown and described with reference to the above embodiments, which are merely examples of the best mode for implementing the systems and methods. Those skilled in the art will understand that various changes can be made to the embodiments of the systems and methods described herein when implementing the systems and / or methods without departing from the spirit and scope of the present invention as defined in the appended claims. The appended claims are intended to define the scope of the systems and methods, and thus systems and methods that fall within these claims and their equivalents may be covered. The above description of the systems and methods should be understood to include the combination of all new and non-obvious elements described herein, and there may be claims in this application or subsequent applications that cover any combination of new and non-obvious elements. In addition, the above embodiments are exemplary, and no single feature or element is essential in all possible combinations that may be claimed in this application or subsequent applications.

Claims

1. A rear door assembly for a vacuum cleaner truck, characterized in that, it includes: a rear door, in its lower region there is formed a first dust discharge port, and in its upper region there is formed a second dust discharge port; a controlled first conveying mechanism installed corresponding to the first dust discharge port in the lower region of the rear door, the first conveying mechanism having a conveying starting end and a conveying ending end adjacent to the dust discharge port of the vacuum cleaner truck; a first cover installed to be openable and closable to the first dust discharge port; a controlled second conveying mechanism installed corresponding to the second dust discharge port in the upper region of the rear door, the second conveying mechanism having a conveying starting end and a conveying ending end adjacent to the dust discharge port of the vacuum cleaner truck; and a second cover installed to be openable and closable to the second dust discharge port; wherein, each of the first conveying mechanism and the second conveying mechanism includes: a driving mechanism installed to the rear door, a rotating shaft connected to the driving mechanism, and a spiral pushing blade installed to the rotating shaft; wherein, the first dust discharge port is disposed in the middle of the rear door, and the first conveying mechanism includes a pair of spiral pushing blades oppositely and reversely spirally connected to its rotating shaft; wherein, the second dust discharge port is disposed on one side of the rear door, and the second conveying mechanism includes a spiral pushing blade connected to its rotating shaft and continuously spirally extending from one end of the rotating shaft to the other end to be adjacent to the second dust discharge port; wherein, at least one of the first cover and the second cover is pivotally installed on the rear door and connected to an opening and closing mechanism; wherein, the opening and closing mechanism includes: a controlled linear motion mechanism installed to the rear door; and a connecting rod hinged to the linear motion mechanism and connected to the corresponding cover.

2. The rear door assembly for a vacuum cleaner truck according to claim 1, characterized in that, the rear door is pivotally installed to define an openable and closable discharge port of the vacuum cleaner truck.

3. The rear door assembly for a vacuum cleaner truck according to claim 1, characterized in that, the rear door is provided with an observation window for observing the interior of the vacuum cleaner truck, the observation window including an observation opening and a lid installed to be openable and closable to the observation opening.

4. The rear door assembly for a vacuum cleaner truck according to claim 1, characterized in that, the rear door includes a rear door panel forming an upper groove, a lower groove, and a partition between the upper groove and the lower groove, the first conveying mechanism is installed in the lower groove, and the second conveying mechanism is installed in the upper groove.

5. The rear door assembly for a vacuum cleaner truck according to claim 1, characterized in that, at least one of the first dust discharge port and the second dust discharge port is connected with a dust discharge pipe.

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