CN213255042U - Hydraulic pressure quartering hammer is with supplementary dust device - Google Patents
Hydraulic pressure quartering hammer is with supplementary dust device Download PDFInfo
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- CN213255042U CN213255042U CN202021622155.6U CN202021622155U CN213255042U CN 213255042 U CN213255042 U CN 213255042U CN 202021622155 U CN202021622155 U CN 202021622155U CN 213255042 U CN213255042 U CN 213255042U
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- dust
- collection box
- dust collection
- filter plate
- negative pressure
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Abstract
The utility model relates to a hydraulic pressure quartering hammer is with supplementary dust device, it includes dust cage, tub and the case that gathers dust, the fixed bottom that sets up at the quartering hammer body in top of dust cage, the one end of tub and the week side intercommunication setting of dust cage gather dust, the other end and the case intercommunication setting of gathering dust of tub, one side fixed connection of case of gathering dust is in one side of quartering hammer body, is provided with the negative pressure power spare that is used for making to gather dust and forms the negative pressure in the case on the case of gathering dust. This application is through setting up the dust cage, the pipe gathers dust, the dust collection box, negative pressure power spare, when using hydraulic quartering hammer to carry out the breakage to big stone, start negative pressure power spare, make negative pressure power spare produce the negative pressure in with the dust collection box, then gather dust and produce the negative pressure in the pipe, the pipe that gathers dust absorbs the air that the dust cage covered, then make the dust in the air along with the air along gathering dust the pipe entering dust collection box that gathers dust, accomplish the collection of dust collection box to the dust simultaneously, and then reduce the pollution of the dust that produces when the quartering hammer carries out the breakage to big stone to the air.
Description
Technical Field
The application relates to the field of construction equipment, especially, relate to a hydraulic pressure is supplementary dust device for quartering hammer.
Background
The hydraulic breaking hammer is called breaking hammer or breaker for short, the power source of the hydraulic breaking hammer is the pressure provided by an excavator, a loader or a pump station, and the hydraulic breaking hammer can effectively break stones and rocks in engineering construction and improve the working efficiency. In the process of producing concrete, a hydraulic crusher is needed to crush larger stones, and then the crushed stones are crushed by the crusher, so that stones with corresponding particle sizes are obtained and used as raw materials of the concrete.
In prior art, chinese utility model patent like publication number CN207538106U discloses a hydraulic breaking hammer is used in construction, including drill rod, hydraulic breaking hammer body, dustproof mechanism, casing, hydro-cylinder and heating mechanism, its characterized in that: the drill rod is installed on the lower end face of the hydraulic breaking hammer body, the dustproof mechanism is arranged on the outer surface of the hydraulic breaking hammer body, the hydraulic breaking hammer body is installed inside the shell, the oil cylinder is installed inside the shell, and the heating mechanism is arranged on the annular side face of the oil cylinder; the dustproof mechanism comprises a dustproof cover, a buckle, an expansion bolt, a movable baffle and a through hole, the dustproof cover is arranged on the outer surface of the hydraulic breaking hammer body, the upper side of the dustproof cover is fixed with the upper side of the hydraulic breaking hammer body through the buckle, the lower side of the dustproof cover is fixed with the lower side of the hydraulic breaking hammer body through the expansion bolt, the through hole is formed in the dustproof cover, the movable baffle is arranged on the outer surface of the dustproof cover, the fixed end of the movable baffle is connected with the outer surface of the dustproof cover through a rivet, and the free end of the movable baffle is connected with the outer surface of the dustproof; heating mechanism includes ring channel, heating plate, battery and heating switch, the ring channel is installed in hydro-cylinder annular side, the heating plate is installed inside the ring channel, the battery is installed inside the casing, the heating switch is installed at the casing rear end face. The design solves the problem that the original hydraulic breaking hammer is poor in dustproof effect, and the problem that the oil temperature of the original hydraulic breaking hammer is too low in a low-temperature environment is solved.
In view of the above-mentioned related art, the inventor believes that when the hydraulic breaking hammer is used for breaking a large stone, as the hydraulic breaking hammer continuously impacts the large stone, a large amount of dust is generated on the surface and the cracks of the large stone, and the dust is mixed into the air along with the flow of the air, so that air pollution is caused.
SUMMERY OF THE UTILITY MODEL
In order to reduce the dust that produces when hydraulic breaker carries out the breakage to the stone and to the pollution of air, this application provides a hydraulic pressure quartering hammer is with supplementary dust device.
The application provides a pair of hydraulic breaking hammer adopts following technical scheme with supplementary dust device:
the utility model provides a hydraulic pressure quartering hammer is with supplementary dust device, includes dust cage, tub and the case that gathers dust, the fixed bottom that sets up at the quartering hammer body in top of dust cage, the one end of tub and the week side intercommunication setting of dust cage gather dust, the other end and the case intercommunication setting of gathering dust of tub, one side fixed connection of case of gathering dust is in one side of quartering hammer body, it is provided with the negative pressure power spare that is used for making to gather dust in the case and forms the negative pressure to gather dust on the case of gathering dust.
Through adopting above-mentioned technical scheme, when using the hydraulic breaking hammer to carry out the breakage to big stone, start negative pressure power spare for negative pressure power spare produces the negative pressure in with the case that gathers dust, thereby make and gather dust and manage and produce the negative pressure in the pipe, and then make the pipe that gathers dust and absorb the air that the dust hood covered, then make the dust in the air along gathering dust the pipe entering dust box that gathers dust, accomplish the collection of dust box to the dust simultaneously, and then reduce the dust that produces when the breaking hammer carries out the breakage to big stone and pollute the air.
Preferably, the negative pressure power part is negative pressure fan, negative pressure fan and dust collection box intercommunication set up, just be provided with in the dust collection box and be used for carrying out filterable filtration to the air in the dust collection box.
Through adopting above-mentioned technical scheme, when using supplementary dust device to carry out the dust fall to hydraulic pressure quartering hammer during operation, start negative-pressure air fan, thereby make the air in the case of gathering dust to be taken out by negative-pressure air fan, then make the pressure in the case of gathering dust reduce, and then make the air that the dust cage covered be inhaled into in the case of gathering dust by the pipe that gathers dust, make the dust follow the air and get into in the case of gathering dust simultaneously, make the filtration piece in the case of gathering dust at last filter the air of inhaling in the case of gathering dust, finally reach the effect that the dust was collected in the case of gathering dust, the phenomenon that the air in the case was taken out in the dust follow case takes place when the filter plate can reduce negative-pressure air fan takes.
Preferably, the filter element is a filter plate, the filter plate is fixedly connected with the inner wall of the dust collection box, the filter plate is perpendicular to the flowing direction of air in the dust collection box, and the filter plate is provided with filter holes.
By adopting the technical scheme, the air covered by the dust hood enters the dust collection box through the dust collection pipe, the air is left through dust through the filter holes on the filter plate, then the air entering the dust collection box is sucked out through the suction effect of the negative pressure fan, the dust entering the dust collection box is left in the dust collection box, and finally the dust collection effect is achieved.
Preferably, the side surface of the filter plate facing the negative pressure fan is provided with a brush, the brush is connected with the filter plate in a sliding mode along the direction perpendicular to the air flowing direction in the dust collection box, and a brush head of the brush is abutted to the filter plate.
Through adopting above-mentioned technical scheme, the air that is covered by the dust cage gets into in the dust collecting box through the pipe that gathers dust, the filtration pore on the filter plate blocks of air in the dust collecting box, at negative-pressure air fan during operation, the drive brush, make the brush take place the relative slip along the direction that the air flows in the perpendicular to dust collecting box and filter plate, then make the brush clear up the dust on the filter plate, the condition that reduces the dust jam filtration pore takes place, and then increase supplementary dust device's dust fall effect, set up the brush in one side of filter plate towards negative-pressure air fan, can reduce when the brush clears up the filter plate, the phenomenon that the dust moved to negative-pressure air fan one side through the filtration pore takes place, finally reach the phenomenon that the dust in the reduction dust collecting box got.
Preferably, a scraper is arranged on the side surface of the filter plate, which is far away from the negative pressure fan, the scraper is connected with the filter plate in a sliding mode along the direction perpendicular to the flowing direction of air in the dust collection box, and one side of the scraper is abutted to the filter plate.
Through adopting above-mentioned technical scheme, through the pipe air that gathers dust in getting into the case that gathers dust, the air flows into the atmosphere through the filtration pore, and the dust is blockked under the effect of filtration pore, and some falls along the filter plate of the dust that is blockked, and some stay on the filter plate, drive the scraper blade for scraper blade and filter plate take place relative motion, and then make the scraper blade scrape the dust on the filter plate down, reach the filter effect that reduces the dust and stop on the filter plate and influence the filter plate.
Preferably, the dust collecting box is provided with a driving assembly for driving the scraper and the brush to move synchronously.
Through adopting above-mentioned technical scheme, when supplementary dust device carries out the dust fall to the pipe that gathers dust, start negative-pressure air fan and start drive assembly for drive assembly drives brush and scraper blade, makes drive assembly drive brush and scraper blade motion then, and then the completion cleans the filter plate and collects the dust on the filter plate.
Preferably, drive assembly includes two sets of reciprocal lead screws and driving motor, and every group reciprocal lead screw all includes lead screw and slider, two the lead screw all rotates with the case that gathers dust to be connected, and two the collection dirt case is all worn out with the one end of lead screw, driving motor and collection dirt case fixed connection, just driving motor's output shaft and a lead screw wear out the one end transmission of collecting the dirt case to be connected, two the equal coaxial fixedly connected with belt pulley of one end of wearing out the collection dirt case of lead screw, two belt pulley belt transmission connects, two the slider respectively with scraper blade and brush fixed connection that correspond separately.
Through adopting above-mentioned technical scheme, when needs scraper blade and brush cleared up the filter plate, start driving motor for driving motor drives the lead screw rotation of reciprocal lead screw, under the effect of two belt pulleys, makes the lead screw synchronous rotation of two reciprocal lead screws, makes then the slider on the reciprocal lead screw drive respectively and takes place relative slip between scraper blade and brush and the filter plate, and then realizes the simultaneous movement of scraper blade and brush.
Preferably, the filtration pore is opened in the filter plate and is close to driving motor's one end, be provided with the dust removal drawer on the dust collection box, just the dust removal drawer sets up between filter plate and the pipe that gathers dust, and the dust removal drawer sets up the one end of keeping away from driving motor at the filter plate, the one end of dust removal drawer penetrate in the dust collection box and with gather dust the case along perpendicular to dust collection box in the air flow direction sliding connection.
Through adopting above-mentioned technical scheme, under the effect of driving motor and belt pulley, the lead screw of two reciprocal lead screws takes place synchronous rotation, then make the lead screw drive the slider and take place the relative slip along the direction that the perpendicular to was gathered dust the case air flow in with the filter plate, thereby make scraper blade and brush and filter plate take place the relative slip, and then make the dust on the scraper blade with the filter plate scrape to the dust removal drawer in, make things convenient for the staff to clear up the dust in the case of gathering dust simultaneously, after the dust collection in the dust removal drawer is full, take out the dust removal drawer, then pour into the disposal bag with the dust in the dust removal drawer, the clearance of final back dust.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by arranging the dust collection cover, the dust collection pipe, the dust collection box and the negative pressure power part, when a hydraulic breaking hammer is used for breaking a large stone, the negative pressure power part is started, so that negative pressure is generated in the dust collection pipe by the negative pressure power part, the dust collection pipe absorbs air covered by the dust collection cover, dust in the air enters the dust collection box along the dust collection pipe along with the air, the dust collection of the dust collection box is completed, and the pollution of the dust generated when the breaking hammer breaks the large stone to the air is reduced;
2. by arranging the negative-pressure fan and the filter piece, when the auxiliary dust falling device is used for falling dust in the working process of the hydraulic breaking hammer, the negative-pressure fan is started, so that air in the dust collection box is sucked out by the negative-pressure fan, the pressure in the dust collection box is reduced, the air covered by the dust collection cover is sucked into the dust collection box by the dust collection pipe, meanwhile, dust enters the dust collection box along with the air, finally, the filter piece in the dust collection box filters the air sucked into the dust collection box, the effect that the dust is collected in the dust collection box is finally achieved, the filter plate can reduce the phenomenon that the air in the dust collection box is sucked out when the negative-pressure fan sucks the air in the dust collection box, and further, the dust is guaranteed to be collected;
3. through setting up the brush, the air that is covered by the dust cage gets into the dust collecting box through the pipe that gathers dust, the filtration pore on the filter plate of air in the dust collecting box blocks, at negative-pressure air fan during operation, the drive brush, make the brush take place the relative slip along the direction that the air flows in the perpendicular to dust collecting box and filter plate, then make the brush clear up the dust on the filter plate, the condition that reduces the dust jam filtration pore takes place, and then increase auxiliary dust device's dust fall effect, set up the brush in one side of filter plate towards negative-pressure air fan, can reduce when the brush clears up the filter plate, the phenomenon that the dust moved to negative-pressure air fan one side through the filtration pore takes place, finally reach the phenomenon that reduces the dust in the dust collecting box and get.
Drawings
Fig. 1 is a schematic structural diagram of the present application.
Description of reference numerals: 100. a dust collection cover; 200. a dust collecting pipe; 300. a dust collection box; 310. a chute; 320. a dust removal drawer; 400. a breaking hammer body; 500. a negative pressure fan; 600. filtering the plate; 610. filtering holes; 620. a brush; 621. a slider; 630. a squeegee; 700. a drive assembly; 710. a reciprocating screw; 711. a lead screw; 712. a slider; 713. a belt pulley; 714. a belt; 720. the motor is driven.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application discloses hydraulic breaking hammer is with supplementary dust device.
Referring to fig. 1, an auxiliary dust falling device for a hydraulic breaking hammer comprises a dust collection cover 100, a dust collection pipe 200 and a dust collection box 300, wherein the top of the dust collection cover 100 is fixedly installed at the bottom of a breaking hammer body 400 through screws, one end of the dust collection pipe 200 is communicated with the peripheral side face of the dust collection cover 100, the other end of the dust collection pipe 200 is communicated with the dust collection box 300, one side of the dust collection box 300 is installed at one side of the breaking hammer body 400 through screws or welding, and a welding mode is adopted in the embodiment. The dust collection box 300 is provided with a negative pressure power part for forming negative pressure in the dust collection box 300, the negative pressure power part is a negative pressure fan 500, and the negative pressure fan 500 is communicated with the dust collection box 300. When using supplementary dust device to carry out the dust fall to hydraulic pressure quartering hammer during operation, start negative-pressure air fan 500, make negative-pressure air fan 500 take out the air in dust collection box 300 then, and then form the negative pressure in making dust collection box 300, then make the air that is covered by dust cage 100 get into dust collection box 300 through tub 200 that gathers dust, and then make the dust along with in the air gets into dust collection box 300.
In order to reduce dust in the dust collection box 300 from flowing into the atmosphere along with the air in the dust collection box 300, a filter element for filtering the air in the dust collection box 300 is installed in the dust collection box 300, the filter element is a filter plate 600, the filter plate 600 is fixedly welded with the inner wall of the dust collection box 300, the filter plate 600 is arranged perpendicular to the flowing direction of the air in the dust collection box 300, and the filter plate 600 is provided with filter holes 610. Air enters the dust collection box 300 through the dust collection pipe 200, the air in the dust collection box 300 is discharged to the atmosphere through the filter holes 610 and the negative pressure fan 500, and dust is left under the action of the filter holes 610, so that the dust is collected.
In order to clean the filter plate 600 conveniently, the brush 620 is installed on the side of the filter plate 600 facing the negative pressure fan 500, the brush 620 is connected with the filter plate 600 in a sliding manner along the direction perpendicular to the air flowing direction in the dust collection box 300, and the brush 620 head of the brush 620 abuts against the filter plate 600. A scraper 630 is installed on the side of the filter plate 600 away from the negative pressure fan 500, the scraper 630 is connected with the filter plate 600 in a sliding manner along the direction perpendicular to the flow direction of the air in the dust collection box 300, and one side of the scraper 630 abuts against the filter plate 600. Sliding grooves 310 are formed in the dust collection box 300 along the direction perpendicular to the flowing direction of air in the dust collection box 300 corresponding to the brushes 620 and the scraping plates 630, sliding blocks 621 are integrally formed on the scraping plates 630 and the brushes 620 corresponding to the sliding grooves 310, and the sliding blocks 621 are connected with the sliding grooves 310 in a sliding mode.
In order to realize the automatic movement of the scraping plate 630 and the brush 620, a driving assembly 700 for driving the scraping plate 630 and the brush 620 to move synchronously is installed on the dust collection box 300, the driving assembly 700 includes two sets of reciprocating lead screws 710 and a driving motor 720, each set of reciprocating lead screws 710 includes a lead screw 711 and a slider 712, the two lead screws 711 are both rotatably connected with the dust collection box 300, the same end of the two lead screws 711 penetrates out of the dust collection box 300, the driving motor 720 and the dust collection box 300 are fixedly connected through a bolt pair, an output shaft of the driving motor 720 and one end of the lead screw 711 penetrating out of the dust collection box 300 are coaxially welded together, one end of the two lead screws 711 penetrating out of the dust collection box 300 is coaxially and fixedly welded with a belt pulley 713, the two belt pulleys 713 are in transmission connection through a belt 714, and the two sliders 712 are respectively and fixedly welded.
In order to facilitate workers to take out dust in the dust collection box 300, the filter hole 610 is formed in one end, close to the driving motor 720, of the filter plate 600, the dust collection box 300 is provided with the dust removal drawer 320, the dust removal drawer 320 is installed between the filter plate 600 and the dust collection pipe 200, the dust removal drawer 320 is installed at one end, far away from the driving motor 720, of the filter plate 600, and one end of the dust removal drawer 320 penetrates into the dust collection box 300 and is in sliding connection with the dust collection box 300 in the direction perpendicular to the air flowing direction in the dust collection box 300. When the brush 620 and the scraper 630 clean the filter plate 600, the brush 620 cleans the filter holes 610 on the filter plate 600, and the scraper 630 scrapes the dust on the filter plate 600 into the dust removal drawer 320, so that the dust is scraped into the dust removal drawer 320 by following the scraper 630. The filter holes 610 opened at one end of the filter sheet 600 near the driving motor 720 can reduce the occurrence of dust scraped by the scraper 630 flowing out of the dust box 300 following the air flow in the dust box 300.
The embodiment of the application provides a hydraulic pressure quartering hammer is with supplementary dust device's implementation principle does: when the hydraulic breaking hammer breaks a large stone, the negative pressure fan 500 and the driving motor 720 are started, then the negative pressure fan 500 pumps air in the dust collection box 300 into atmospheric air, so that negative pressure is generated in the dust collection box 300, then the dust collection pipe 200 sucks air covered by the dust collection cover 100 into the dust collection box 300, and then dust generated during the working of the hydraulic breaking hammer enters the dust collection box 300 along with the air. The air introduced into the dust box 300 flows into the atmosphere through the filter holes 610 and the negative pressure fan 500, and the dust introduced into the dust box 300 is blocked by the filter holes 610, so that the dust falls down along the filter sheet 600 into the dust drawer 320. When the negative pressure fan 500 is operated, the driving motor 720 is simultaneously operated, so that the scraper 630 and the brushes 620 are relatively moved with respect to the filter plate 600, and the scraper 630 scrapes dust adhered to the filter plate 600 into the dust removal drawer 320. When the brush 620 slides relative to the filter plate 600, the brush 620 cleans the filter hole 610, so that the dust blocked in the filter hole 610 falls into the dust removal drawer 320 after being cleaned by the brush 620. After the dust in the dust removal drawer 320 is fully collected, the dust removal drawer 320 is pulled out, so that the dust in the dust removal drawer 320 can be poured into a garbage bag conveniently by a worker, and the effect of reducing the air pollution caused by the dust is finally achieved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a hydraulic pressure quartering hammer is with supplementary dust device which characterized in that: including dust cage (100), tub (200) and dust collection box (300) gather dust, the fixed bottom that sets up at quartering hammer body (400) in top of dust cage (100), the one end of tub (200) that gathers dust sets up with the week side intercommunication of dust cage (100), the other end and the dust collection box (300) intercommunication setting of tub (200) gather dust, one side fixed connection of dust collection box (300) is in one side of quartering hammer body (400), be provided with the negative pressure power spare that is arranged in making dust collection box (300) in form the negative pressure on dust collection box (300).
2. The auxiliary dust falling device for the hydraulic breaking hammer according to claim 1, wherein: the negative pressure power part is negative pressure fan (500), negative pressure fan (500) and dust collection box (300) intercommunication setting, just be provided with in dust collection box (300) and be used for carrying out filterable filtration piece to the air in dust collection box (300).
3. The auxiliary dust falling device for the hydraulic breaking hammer according to claim 2, wherein: the filter piece is a filter plate (600), the filter plate (600) is fixedly connected with the inner wall of the dust collection box (300), the filter plate (600) is perpendicular to the flowing direction of air in the dust collection box (300), and filter holes (610) are formed in the filter plate (600).
4. The auxiliary dust falling device for the hydraulic breaking hammer according to claim 3, wherein: the side of the filter plate (600) facing the negative pressure fan (500) is provided with a brush (620), the brush (620) is connected with the filter plate (600) in a sliding mode along the direction perpendicular to the air flowing in the dust collection box (300), and the head of the brush (620) is abutted to the filter plate (600).
5. The auxiliary dust falling device for the hydraulic breaking hammer according to claim 4, wherein: the side of the filter plate (600) departing from the negative pressure fan (500) is provided with a scraper (630), the scraper (630) is connected with the filter plate (600) in a sliding manner along the flowing direction of air in the dust collection box (300), and one side of the scraper (630) is abutted to the filter plate (600).
6. The auxiliary dust falling device for the hydraulic breaking hammer according to claim 5, wherein: the dust collection box (300) is provided with a driving assembly (700) for driving the scraper (630) and the brush (620) to move synchronously.
7. The auxiliary dust falling device for the hydraulic breaking hammer according to claim 6, wherein: drive assembly (700) includes two sets of reciprocal lead screw (710) and driving motor (720), and every group reciprocal lead screw (710) all includes lead screw (711) and slider (712), two lead screw (711) all rotates with dust collection box (300) to be connected, and two dust collection box (300) is all worn out to the same end of lead screw (711), driving motor (720) and dust collection box (300) fixed connection, just the output shaft of driving motor (720) and one lead screw (711) are worn out the one end transmission of dust collection box (300) and are connected, two the one end of wearing out dust collection box (300) of lead screw (711) is coaxial fixedly connected with belt pulley (713), two belt pulley (713) belt (714) transmission is connected, two slider (712) respectively with scraper blade (630) and brush (620) fixed connection that correspond separately.
8. The auxiliary dust falling device for the hydraulic breaking hammer according to claim 7, wherein: the one end that is close to driving motor (720) is seted up at filter plate (600) in filtration pore (610), be provided with dust removal drawer (320) on dust collection box (300), just dust removal drawer (320) set up between filter plate (600) and dust collection pipe (200), and dust removal drawer (320) set up the one end of keeping away from driving motor (720) in filter plate (600), the one end of dust removal drawer (320) penetrate in dust collection box (300) and along perpendicular to dust collection box (300) air flow direction sliding connection with dust collection box (300).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021622155.6U CN213255042U (en) | 2020-08-06 | 2020-08-06 | Hydraulic pressure quartering hammer is with supplementary dust device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021622155.6U CN213255042U (en) | 2020-08-06 | 2020-08-06 | Hydraulic pressure quartering hammer is with supplementary dust device |
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| Publication Number | Publication Date |
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| CN213255042U true CN213255042U (en) | 2021-05-25 |
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| CN202021622155.6U Expired - Fee Related CN213255042U (en) | 2020-08-06 | 2020-08-06 | Hydraulic pressure quartering hammer is with supplementary dust device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005868A1 (en) * | 2021-07-26 | 2023-02-02 | 广东利元亨智能装备股份有限公司 | Negative pressure generation system and waste collection device |
-
2020
- 2020-08-06 CN CN202021622155.6U patent/CN213255042U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005868A1 (en) * | 2021-07-26 | 2023-02-02 | 广东利元亨智能装备股份有限公司 | Negative pressure generation system and waste collection device |
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Granted publication date: 20210525 |