CN113605292B - Energy-saving and environment-friendly garbage sweeper - Google Patents
Energy-saving and environment-friendly garbage sweeper Download PDFInfo
- Publication number
- CN113605292B CN113605292B CN202110686746.2A CN202110686746A CN113605292B CN 113605292 B CN113605292 B CN 113605292B CN 202110686746 A CN202110686746 A CN 202110686746A CN 113605292 B CN113605292 B CN 113605292B
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- Prior art keywords
- pipeline
- dust collection
- contact switch
- filter
- saving
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- 241001417527 Pempheridae Species 0.000 title claims abstract description 19
- 239000000428 dust Substances 0.000 claims abstract description 63
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 230000007704 transition Effects 0.000 claims abstract description 14
- 238000010408 sweeping Methods 0.000 claims description 5
- 230000007306 turnover Effects 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000011065 in-situ storage Methods 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 18
- 239000004575 stone Substances 0.000 abstract description 16
- 238000009434 installation Methods 0.000 description 5
- 230000001960 triggered effect Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
- E01H1/0827—Dislodging by suction; Mechanical dislodging-cleaning apparatus with independent or dependent exhaust, e.g. dislodging-sweeping machines with independent suction nozzles ; Mechanical loosening devices working under vacuum
- E01H1/0836—Apparatus dislodging all of the dirt by suction ; Suction nozzles
- E01H1/0845—Apparatus dislodging all of the dirt by suction ; Suction nozzles with mechanical loosening or feeding instruments for the dirt to be sucked- up, e.g. brushes, scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/06—Selective separation of solid materials carried by, or dispersed in, gas currents by impingement against sieves
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Cleaning Of Streets, Tracks, Or Beaches (AREA)
Abstract
One or more embodiments of the present disclosure provide an energy-saving and environment-friendly garbage sweeper, comprising: the dust collection device comprises a carriage, wherein a dust collection cavity is arranged in the carriage, a dust collection fan is arranged in the dust collection cavity, two ends of the dust collection cavity are respectively communicated with an exhaust pipe and a transverse pipeline, a dust filtering net is arranged in the transverse pipeline, the transverse pipeline is communicated with a dust collection box, a transition pipeline is communicated above the dust collection box, the transition pipeline is communicated with an air inlet pipe, and a filtering assembly is arranged at the end part of the transition pipeline; the gear of the dust collection fan can be adjusted according to the quantity of sand and stone, so that the dust collection fan is energy-saving and environment-friendly.
Description
Technical Field
One or more embodiments of the present disclosure relate to the field of garbage truck technologies, and in particular, to an energy-saving and environment-friendly garbage sweeper.
Background
Creating civilized cities is a goal of many cities in the current stage of our country. Civilized cities are not only in the improvement of human quality, but also in the improvement of urban images, and are one of very important standards for the most visual reflection of urban images and the cleanliness degree of cities.
Traditional sanitation work mainly relies on sanitation workman's manpower to clean, but in summer and winter, sanitation workman cleans the street and need bear extreme weather condition to clean intensity of labour is big, cleans efficiency and is limited, consequently, garbage truck obtains wide application, and it absorbs subaerial rubbish through dust extraction, can be quick convenient completion sanitation work.
The present inventors have found that the prior art has at least the following problems:
On the road section of adjacent road administration construction, the gravel and sand of machineshop car delivery often drops on the road surface, when cleaning, if the suction is too big, leads to easily that the dust filter net is damaged by the grit striking, if the suction is too little, bigger grit can't be cleaned off.
Disclosure of Invention
In view of this, an object of one or more embodiments of the present disclosure is to provide an energy-saving and environment-friendly garbage sweeper, so as to solve the problem that when sweeping, sand and stone carried by an engineering truck often fall on a road surface in a road section adjacent to road construction, if the suction force is too large, the dust filtering net is easily damaged by the impact of the sand and stone, if the suction force is too small, the larger sand and stone cannot be cleaned.
In view of the above, one or more embodiments of the present disclosure provide an energy-saving and environment-friendly garbage sweeper, including: the dust collection device comprises a carriage, wherein a dust collection cavity is arranged in the carriage, a dust collection fan is arranged in the dust collection cavity, two ends of the dust collection cavity are respectively communicated with an exhaust pipe and a transverse pipeline, a dust filtering net is arranged in the transverse pipeline, the transverse pipeline is communicated with a dust collection box, a transition pipeline is communicated above the dust collection box, the transition pipeline is communicated with an air inlet pipe, and a filtering assembly is arranged at the end part of the transition pipeline;
the filter assembly comprises a filter pipeline arranged at the top of the dust box, a plurality of ribs are arranged in the filter pipeline, a reset spring is connected to the ribs, a filter plate is connected to the reset spring, a plurality of filter plates are mutually spliced to form a whole filter panel, a push rod is connected to the back of the filter plate, one-way pushing teeth are arranged on the push rod, an installation shaft is arranged in the filter pipeline, a plurality of rotating gears are arranged on the installation shaft and are respectively matched with the one-way pushing teeth on the push rod, when the push rod moves backwards, the pushing gears rotate, when the push rod returns to the original position and moves forwards, the pushing gears do not rotate, a toothed belt is arranged between the toothed belt wheels in a matched mode, a pressing plate is arranged on the toothed belt, an upper driving roller and a lower driving roller are also arranged in the filter pipeline, a driving belt is arranged between the upper driving roller and the lower driving roller, an upper contact switch and a lower contact switch are arranged on the driving belt, and the pressing plate is arranged between the upper contact switch and the lower contact switch and the dust collection fan.
Optionally, the upper contact switch and the lower contact switch are electrically connected with a timing unit, and the timing unit records the time t used by the contact of the pressing plate and the upper contact switch.
Optionally, one-way promotion tooth includes the tooth root of fixed mounting on the push rod, and the connecting axle is installed to the tooth root bottom, the connecting axle is installed in the one side of keeping away from the filter of tooth root bottom, and the connecting axle is connected with and stirs the tooth.
Optionally, the carriage includes the back lid, and the back lid is connected with the tilting axis, and tilting axis fixed mounting is in carriage rear end top.
Optionally, a guiding rotating shaft is installed on the inner wall of the rear cover, the guiding rotating shaft is connected with a guiding plate, and the guiding plate is matched with the filtering pipeline to guide the air flow.
Optionally, the connecting rod is installed to carriage bottom front end position, and the connecting rod is connected with the mounting disc, installs driving motor on the mounting disc, and driving motor output power is connected with the dish of sweeping the floor.
Optionally, the dust filtering net is connected with a vibrating spring, the vibrating spring is connected with a spring seat, and the spring seat is fixedly arranged on the inner wall of the transverse pipeline.
It can be seen from the above that, the energy-saving and environment-friendly garbage sweeper provided by one or more embodiments of the present specification is provided with a filtering assembly, the filtering assembly comprises a filtering pipeline, a plurality of filtering plates are installed on the filtering pipeline, the filtering plates are connected with reset springs, sand and stone can strike the filtering plates to enable the filtering plates to move, the filtering plates move to drive the unidirectional pushing teeth to move, the unidirectional pushing teeth push the gear 3023 to rotate, the pressing plates move, contact switches are arranged above and below the pressing plates, the contact switches trigger through different contact switches, and the gear change of the dust suction fan is controlled, so that on the basis that sand and stone are absorbed, a proper gear is selected, energy sources are saved, and the environment-friendly effect is achieved.
Drawings
For a clearer description of one or more embodiments of the present description or of the solutions of the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only one or more embodiments of the present description, from which other drawings can be obtained, without inventive effort, for a person skilled in the art.
FIG. 1 is a schematic diagram of an energy-efficient and environmentally friendly garbage sweeper according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a filter assembly of an energy efficient and environmentally friendly garbage sweeper according to one or more embodiments of the present disclosure;
FIG. 3 is an enlarged schematic view of a portion A of FIG. 2;
Fig. 4 is a schematic rear view of a filter assembly of an energy efficient and environmentally friendly garbage sweeper according to one or more embodiments of the present disclosure.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
It is noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
According to one or more embodiments of the present disclosure, an energy-saving and environment-friendly garbage sweeper is shown, and the garbage sweeper comprises a carriage 101, wherein a dust collection cavity 211 is arranged in the carriage 101, a dust collection fan 212 is installed in the dust collection cavity 211, two ends of the dust collection cavity 211 are respectively communicated with an exhaust pipe 213 and a transverse pipeline 210, a dust filtering net 207 is installed in the transverse pipeline 210, the transverse pipeline 210 is communicated with a dust collection box 203, a transition pipeline 202 is communicated above the dust collection box 203, the transition pipeline 202 is communicated with an air inlet pipe 201, and a filtering assembly 301 is installed at the end part of the transition pipeline 202;
The filter assembly 301 comprises a filter pipeline 3011 installed at the top of the dust box 203, a plurality of ribs 3012 are installed in the filter pipeline 3011, a reset spring 3013 is connected to the ribs 3012, the reset spring 3013 is connected with a filter plate 3014, a plurality of filter plates 3014 are mutually spliced to form the whole filter panel, a push rod 3016 is connected to the back of the filter plate 3014, unidirectional pushing teeth are installed on the push rod 3016, an installation shaft 3027 is installed in the filter pipeline 3011, a plurality of rotating gears 3023 are installed on the installation shaft 3027, a plurality of rotating gears 3023 are respectively matched with the unidirectional pushing teeth on the push rod 3016, the pushing gears 3023 are rotated when the push rod 3016 returns to the original position and moves forward, a toothed belt 3020 is also installed on the installation shaft 3027, a pressing plate 3022 is installed on the toothed belt 3021, a driving roller 3024 is also installed inside the filter pipeline 3011, a switch 3024 is installed on the lower driving roller 3026, a switch 3025 is installed on the lower driving roller 3024 and is in contact with the upper driving roller 3028, and a switch 3015 is installed on the lower driving roller 3025, and the switch 3015 is in contact with the lower driving roller 3028. In use, the suction fan 212 is started to suck dust, air with dust and stones is sucked in from the air inlet pipe 201 and enters the transition pipeline 202, the stones are blocked down at the filter assembly 301, at this time, the stones impact the filter plate 3014 due to suction force and inertia, the filter plate 3014 is impacted and then moves backward, the push rod 3016 moves backward along with the impact, the unidirectional pushing teeth push the rotating gear 3023 to rotate, the mounting shaft 3027 rotates, the toothed belt wheel 3020 rotates, the toothed belt 3021 moves, since the filter plate 3014 is provided with a plurality of filter plates 3014, the toothed belt 3021 moves a distance, namely the pressing plate 3022 moves a distance, the suction fan 212 has a plurality of gears, the upper driving roller 3024 and the lower driving roller 3026 have a plurality of gears matched with the suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are initially in initial gears, operate for a period of time, if the pressure plate 3022 contacts with the upper contact switch 3015, it indicates that there is no sand on the road, the pressure plate 3022 and the upper contact switch 3015 are reset, the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are kept at the gear inconvenient, if one end of the operation is performed, the pressure plate 3022 and the lower contact switch 3028 are contacted, it indicates that there is more sand on the road, the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are lifted up, the upper contact switch 3015 and the lower contact switch 3028 are moved faster to compensate for the increase of sand speed, if the upper contact switch 3015 is triggered, the pressure plate 3022 and the upper contact switch 3015 are reset, the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are kept at the gear constant, if the lower contact switch 3028 is triggered after the operation is performed, the pressure plate 3022 and the upper contact switch 3015 are reset, the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are lifted up, until the upper contact switch 3015 is activated. The power of the dust suction fan 212 can be adjusted in real time according to the sand and stone conditions sucked on the road surface, and energy sources can be saved on the basis of completing sand and stone suction.
In some alternative embodiments, the upper contact switch 3015 and the lower contact switch 3028 are electrically connected to a timing unit, and the timing unit records the time t for the platen 3022 to contact the upper contact switch 3015. When the time t for the pressing plate 3022 to contact the upper contact switch 3015 is too small, it means that less sand is produced, and the gear positions of the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are lowered.
In some alternative embodiments, the unidirectional pushing teeth comprise tooth roots 3017 fixedly mounted on the pushing rod 3016, connecting shafts 3018 are mounted at the bottom ends of the tooth roots 3017, the connecting shafts 3018 are mounted on one side, far away from the filter plates 3014, of the bottom ends of the tooth roots 3017, and the connecting shafts 3018 are connected with stirring teeth 3019. So that the toggle tooth 3019 can rotate clockwise but not counterclockwise, thereby achieving the purpose of unidirectional pushing.
In some alternative embodiments, the compartment 101 includes a rear cover 204, and the rear cover 204 is connected to a roll-over shaft 205, and the roll-over shaft 205 is fixedly mounted on top of the rear end of the compartment 101. The rear cover facilitates cleaning of the dust in the dust bin 203.
In some alternative embodiments, a guiding shaft is mounted on the inner wall of the rear cover 204, and a guiding plate 214 is connected to the guiding shaft, and the guiding plate 214 cooperates with the filtering duct 3011 to guide the air flow. The dust collection is convenient.
In some optional embodiments, a connecting rod 102 is installed at the front end position of the bottom of the carriage 101, the connecting rod 102 is connected with a mounting plate 103, a driving motor 104 is installed on the mounting plate 103, and the output end of the driving motor 104 is in power connection with a sweeping plate 105. Garbage is gathered through the sweeping floor 105, and is conveniently sucked.
In some alternative embodiments, a guide roller 106 is further mounted at the bottom of the carriage 101, and the guide roller 106 is disposed between the floor pan 105 and the air inlet pipe 201.
In some alternative embodiments, the dust filter 207 is connected with a vibration spring 209, the vibration spring 209 is connected with a spring seat 208, and the spring seat 208 is fixedly mounted on the inner wall of the transverse pipeline 210.
The working principle of the invention is as follows: in use, the suction fan 212 is started to suck dust, air with dust and stones is sucked in from the air inlet pipe 201 and enters the transition pipeline 202, the stones are blocked down at the filter assembly 301, at this time, the stones impact the filter plate 3014 due to suction force and inertia, the filter plate 3014 is impacted and then moves backward, the push rod 3016 moves backward along with the impact, the unidirectional pushing teeth push the rotating gear 3023 to rotate, the mounting shaft 3027 rotates, the toothed belt wheel 3020 rotates, the toothed belt 3021 moves, since the filter plate 3014 is provided with a plurality of filter plates 3014, the toothed belt 3021 moves a distance, namely the pressing plate 3022 moves a distance, the suction fan 212 has a plurality of gears, the upper driving roller 3024 and the lower driving roller 3026 have a plurality of gears matched with the suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are initially in initial gears, operate for a period of time, if the pressure plate 3022 contacts with the upper contact switch 3015, it indicates that there is no sand on the road, the pressure plate 3022 and the upper contact switch 3015 are reset, the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are kept at the gear inconvenient, if one end of the operation is performed, the pressure plate 3022 and the lower contact switch 3028 are contacted, it indicates that there is more sand on the road, the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are lifted up, the upper contact switch 3015 and the lower contact switch 3028 are moved faster to compensate for the increase of sand speed, if the upper contact switch 3015 is triggered, the pressure plate 3022 and the upper contact switch 3015 are reset, the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are kept at the gear constant, if the lower contact switch 3028 is triggered after the operation is performed, the pressure plate 3022 and the upper contact switch 3015 are reset, the dust suction fan 212, the upper driving roller 3024 and the lower driving roller 3026 are lifted up, until the upper contact switch 3015 is activated. The power of the dust suction fan 212 can be adjusted in real time according to the sand and stone conditions sucked on the road surface, and energy sources can be saved on the basis of completing sand and stone suction.
The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the disclosure, are therefore intended to be included within the scope of the disclosure.
Claims (7)
1. An energy-saving and environment-friendly garbage sweeper is characterized by comprising: the dust collection device comprises a carriage (101), wherein a dust collection cavity (211) is arranged in the carriage (101), a dust collection fan (212) is arranged in the dust collection cavity (211), two ends of the dust collection cavity (211) are respectively communicated with an exhaust pipe (213) and a transverse pipeline (210), a dust filtering net (207) is arranged in the transverse pipeline (210), the transverse pipeline (210) is communicated with a dust collection box (203), a transition pipeline (202) is communicated above the dust collection box (203), an air inlet pipe (201) is communicated with the transition pipeline (202), and a filtering assembly (301) is arranged at the end part of the transition pipeline (202);
The filter assembly (301) comprises a filter pipeline (3011) arranged at the top of a dust box (203), a plurality of ribs (3012) are arranged in the filter pipeline (3011), a plurality of return springs (3013) are connected to the ribs (3012), the return springs (3013) are connected with filter plates (3014), the filter plates (3014) are spliced with each other to form a whole filter panel, the back of each filter plate (3014) is connected with a push rod (3016), unidirectional pushing teeth are arranged on the push rod (3016), a mounting shaft (3027) is arranged in the filter pipeline (3011), a plurality of rotating gears (3023) are arranged on the mounting shaft (3027), the rotating gears (3023) are respectively matched with the unidirectional pushing teeth on the push rod (3016), the pushing gears (3023) rotate when the push rod (3016) moves backwards, the push gears (3013) do not rotate when the push rod (3016) returns forwards in situ, tooth pulleys (3020) are further arranged on the mounting shaft (3027), a toothed pulley (3020), a plurality of driving roller (3020) are arranged between the driving pulleys (3020), and the upper and lower driving roller (3021) and the inner driving roller (3021) are arranged on the filter assembly (3014), an upper contact switch (3015) and a lower contact switch (3028) are arranged on the transmission belt (3025), a pressing plate (3022) is arranged between the upper contact switch (3015) and the lower contact switch (3028), and the upper contact switch (3015) and the lower contact switch (3028) are electrically connected with the dust suction fan (212).
2. The energy-saving and environment-friendly garbage sweeper as claimed in claim 1, wherein the upper contact switch (3015) and the lower contact switch (3028) are electrically connected with a timing unit, and the timing unit records the time t for the pressing plate (3022) to contact with the upper contact switch (3015).
3. The energy-saving and environment-friendly garbage sweeper as claimed in claim 1, wherein the unidirectional pushing teeth comprise tooth roots (3017) fixedly mounted on the pushing rod (3016), connecting shafts (3018) are mounted at the bottom ends of the tooth roots (3017), the connecting shafts (3018) are mounted at one sides, far away from the filter plates (3014), of the bottom ends of the tooth roots (3017), and the connecting shafts (3018) are connected with poking teeth (3019).
4. The energy-saving and environment-friendly garbage sweeper as claimed in claim 1, wherein the carriage (101) comprises a rear cover (204), the rear cover (204) is connected with a turnover shaft (205), and the turnover shaft (205) is fixedly arranged at the top of the rear end of the carriage (101).
5. The energy-saving and environment-friendly garbage sweeper as claimed in claim 4, wherein a guiding rotating shaft is mounted on the inner wall of the rear cover (204), the guiding rotating shaft is connected with a guiding plate (214), and the guiding plate (214) is matched with the filtering pipeline (3011) to guide air flow.
6. The energy-saving and environment-friendly garbage sweeper as claimed in claim 1, wherein a connecting rod (102) is installed at the front end position of the bottom of the carriage (101), the connecting rod (102) is connected with a mounting plate (103), a driving motor (104) is installed on the mounting plate (103), and the output end of the driving motor (104) is in power connection with a sweeping plate (105).
7. The energy-saving and environment-friendly garbage sweeper as claimed in claim 1, wherein the dust filtering net (207) is connected with a vibrating spring (209), the vibrating spring (209) is connected with a spring seat (208), and the spring seat (208) is fixedly arranged on the inner wall of the transverse pipeline (210).
Priority Applications (1)
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CN202110686746.2A CN113605292B (en) | 2021-06-21 | 2021-06-21 | Energy-saving and environment-friendly garbage sweeper |
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CN202110686746.2A CN113605292B (en) | 2021-06-21 | 2021-06-21 | Energy-saving and environment-friendly garbage sweeper |
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CN113605292B true CN113605292B (en) | 2024-04-19 |
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CN110904900A (en) * | 2019-11-26 | 2020-03-24 | 利辛县江淮扬天汽车有限公司 | Sweeping device of sweeper |
CN212396982U (en) * | 2020-03-31 | 2021-01-26 | 濮阳龙丰纸业有限公司 | Novel automatic dust removal of prepareeing material device |
CN111846709A (en) * | 2020-07-29 | 2020-10-30 | 利辛县江淮扬天汽车有限公司 | Top cap device that opens and shuts for garbage truck |
CN112854075A (en) * | 2021-01-15 | 2021-05-28 | 黄招兰 | Environment-friendly road maintenance dust suction device |
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