CN219024486U - Building waste recovery device - Google Patents
Building waste recovery device Download PDFInfo
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- CN219024486U CN219024486U CN202222950413.9U CN202222950413U CN219024486U CN 219024486 U CN219024486 U CN 219024486U CN 202222950413 U CN202222950413 U CN 202222950413U CN 219024486 U CN219024486 U CN 219024486U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/58—Construction or demolition [C&D] waste
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Abstract
The utility model provides a construction waste recycling device, and relates to the technical field of construction waste recycling. The construction waste recycling device comprises a working box, a discharge hole and a blow-off pipe, wherein a dust removing mechanism is fixedly arranged at the bottom of an inner cavity of the working box, filter screens are fixedly connected to the inner walls of the left side and the right side of the working box, a crushing mechanism is fixedly arranged in the working box, a water feeding pipe is fixedly communicated with the left side of the working box, a discharging mechanism is fixedly arranged at the top of the inner cavity of the working box, and a cover plate is hinged to the upper end of the working box through a pin shaft. This building waste recovery unit is through setting up dust removal mechanism, can degrade the dust that produces in the crushing process, can produce a large amount of dust when smashing the building stone in having solved appearing among the patent number CN2020200941491, and the dust can fly away everywhere, if untimely handling, can cause the injury problem to the environment of pollution surrounding even to human health.
Description
Technical Field
The utility model relates to the technical field of building waste recovery, in particular to a building waste recovery device.
Background
The construction waste is slag soil, waste materials, sludge and other wastes generated in the repairing process when various buildings, structures, pipe networks and the like are constructed, laid or dismantled by construction units or individuals, the site selection of most urban construction waste stacking places is random to a great extent, a great deal of potential safety hazards are left, and the nearby construction sites are temporary stacking places for the construction waste.
And the building waste is usually bulky, need smash it when recycle and recycle back recycle, like a building waste recovery unit of current patent, patent number is CN2020200941491, the device is through pouring the building waste from the feed inlet into inside the organism, through broken mechanism crushing, reduce the building waste volume, and make the reinforcing bar that has in the building waste, iron nail, steel wire etc. separate with the building waste, be convenient for follow-up transportation process, and be convenient for retrieve the classification of building waste, make full use of available resource, reduce the wasting of resources.
However, in the actual use process, the device does not have a dust removing function, a large amount of dust can be generated when the building stone is crushed, the dust can fly around, if the dust is not treated in time, the surrounding environment can be polluted, and even the health of a human body can be damaged.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the utility model provides a construction waste recycling device, which solves the problems in the background technology.
(II) technical scheme
In order to achieve the above purpose, the utility model is realized by the following technical scheme: the utility model provides a building waste recovery device, includes the work box, the bin outlet has been seted up on the right side of work box, the fixed intercommunication in right side bottom of work box has the blow off pipe, the inner chamber bottom fixed mounting of work box has dust removal mechanism, the left and right sides inner wall fixedly connected with filter screen of work box, the inside fixed mounting of work box has crushing mechanism, the fixed intercommunication in left side of work box has the water pipe, the inner chamber top fixed mounting of work box has unloading mechanism, the upper end of work box articulates through the round pin axle has the apron.
The dust removing mechanism comprises an annular water storage pipe, a spray head, a water pump, a water drain pipe, a water pumping pipe, a guide plate, an active carbon adsorption plate and a fine filter plate, wherein the annular water storage pipe is fixedly arranged on the inner wall of the top of the working box, the spray head is uniformly arranged on the lower surface of the annular water storage pipe, the water pump is fixedly arranged on the left side of the working box, the water drain pipe is fixedly communicated with the water drain pipe, the upper end of the water drain pipe is fixedly communicated with the annular water storage pipe, the water pumping port of the water pump is fixedly communicated with the water pumping pipe, the lower end of the water pumping pipe is fixedly communicated with the left side of the working box, the guide plate is fixedly connected with the left side inner wall of the working box, the guide plate is positioned below the filter screen, the active carbon adsorption plate and the fine filter plate are fixedly connected on the inner wall of the bottom of the working box, and the active carbon adsorption plate and the upper end of the fine filter plate are fixedly connected with the lower surface of the guide plate, and the active carbon adsorption plate is positioned on the left side of the fine filter plate.
The crushing mechanism comprises a protective shell, a motor, a first rotating rod, a second rotating rod, a first gear and a second gear, wherein the protective shell is fixedly arranged on the right side of the working box, the motor is fixedly arranged on the inner wall of the right side of the protective shell, the left end of an output shaft of the motor is fixedly connected with the first rotating rod, the left end of the first rotating rod penetrates through the right side of the working box and is rotatably connected to the left side of the working box through a bearing, the second rotating rod is horizontally arranged at the rear of the first rotating rod, two ends of the second rotating rod are rotatably connected to the left side and the right side of the working box through bearings respectively, the first gear is fixedly sleeved on the outer wall of the right end of the first rotating rod, and the second gear is fixedly sleeved on the outer wall of the right end of the second rotating rod.
The blanking mechanism comprises a supporting plate, electromagnetic plates and springs, wherein the inner walls of the left side and the right side of the working box are fixedly connected with the supporting plate and the electromagnetic plates and are positioned above the supporting plate, the upper surfaces of the two supporting plates are fixedly connected with two springs, and the upper ends of the springs are fixedly connected with the lower surface of the electromagnetic plates.
Preferably, crushing teeth are arranged on the outer walls of the first rotating rod and the second rotating rod, and the crushing teeth on the first rotating rod and the second rotating rod are distributed in an equidistance and staggered mode.
Preferably, the filter screen is arranged at one side far away from the discharge port and is obliquely arranged towards the top end of the working box.
Preferably, valves are arranged on the water adding pipe and the sewage draining pipe.
Preferably, the first gear and the second gear are meshed.
Preferably, the front upper end of the working box is provided with a sealing door through a hinge, and the front lower end of the working box is provided with a transparent observation window.
Preferably, the four corners of the lower surface of the working box are fixedly provided with rollers.
(III) beneficial effects
The utility model provides a construction waste recycling device. The beneficial effects are as follows:
1. this building waste recovery unit, through setting up dust removing mechanism, start the water pump when smashing and pass through the water suction pipe extraction work box bottom water, rethread drain pipe is with water transmission for annular water storage pipe supply shower nozzle use, the shower nozzle spouts the dust that produces in the crushing process and degrades, avoid the dust to splash, can produce a large amount of dust when smashing the building stone in having solved appearing in the patent number CN2020200941491, the dust can fly away everywhere, if untimely handling, can pollute the surrounding environment, can cause the injury problem to human health even, smashed building rubbish is discharged along the filter screen from the bin outlet, water passes the filter screen and flows into the bottom right side of work box through the guide plate, water after purifying is purified through thin filter plate and active carbon adsorption plate, water flow into the left side working box bottom working pump after purifying uses, circulation in proper order can carry out cyclic utilization to the water source, the waste of water resource has been reduced, make the device more environmental protection and practicability.
2. This building waste recovery unit, through setting up unloading mechanism, fall into the feed inlet from the work box top with the building waste that needs to be broken, because the reason of gravity drops and drops on the electromagnetic plate, can play the effect of buffering through setting up the spring, alleviate the impact force that the electromagnetic plate received, avoid the electromagnetic plate to be smashed by the stone, simultaneously the electromagnetic plate incessantly shakes the speed that can accelerate the building waste whereabouts, the electromagnetic plate circular telegram, hold the iron nail in the building waste and other materials, avoid the iron nail to enter into in the work box direct with smash the tooth contact and lead to smashing the tooth damage, effectually delayed the life of smashing the tooth.
Drawings
Fig. 1 is a schematic structural view of a construction waste recycling device according to the present utility model;
fig. 2 is a front view of a construction waste recycling device according to the present utility model;
fig. 3 is a plan view of a pulverizing mechanism of a construction waste recycling apparatus according to the present utility model.
1, a working box; 2. a discharge port; 3. a blow-down pipe; 4. a dust removing mechanism; 401. an annular water storage pipe; 402. a spray head; 403. a water pump; 404. a drain pipe; 405. a water pumping pipe; 406. a deflector; 407. an activated carbon adsorption plate; 408. fine filter plates; 5. a filter screen; 6. a crushing mechanism; 601. a protective shell; 602. a motor; 603. a first rotating lever; 604. a second rotating rod; 605. a first gear; 606. a second gear; 7. a water supply pipe; 8. a blanking mechanism; 801. a support plate; 802. an electromagnetic plate; 803. a spring; 9. and a cover plate.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
The embodiment of the utility model provides a construction waste recycling device, as shown in fig. 1-3, the construction waste recycling device comprises a working box 1, idler wheels are fixedly arranged at four corners of the lower surface of the working box 1, the recycling device is convenient to move through the idler wheels, labor burden of workers is lightened, a sealing door is arranged at the upper end of the front face of the working box 1 through a hinge, a transparent observation window is arranged at the lower end of the front face of the working box 1, a discharge outlet 2 is arranged on the right side of the working box 1, a drain pipe 3 is fixedly communicated with the bottom of the right side of the working box 1, a dust removing mechanism 4 is fixedly arranged at the bottom of an inner cavity of the working box 1, a filter screen 5 is fixedly connected to the inner walls of the left side and the right side of the working box 1, one side far away from the discharge outlet 2 is obliquely arranged towards the top of the working box 1, construction waste intercepted on the filter screen 5 can move towards the discharge outlet 2 under the action of self gravity, the construction waste on the filter screen 5 is reduced, a crushing mechanism 6 is fixedly arranged in the working box 1, a water adding pipe 7 is fixedly communicated with the left side of the working box 1, valves are arranged on the drain pipe 7 and the drain pipe 3, a drain pipe 9 can be fixedly connected to the bottom of the working box 1 through the valve, and a control pin shaft 9 is fixedly arranged at the top of the drain pipe 3.
The dust removing mechanism 4 comprises an annular water storage pipe 401, a spray head 402, a water pump 403, a water drain pipe 404, a water suction pipe 405, a guide plate 406, an activated carbon adsorption plate 407 and a fine filter plate 408, wherein the annular water storage pipe 401 is fixedly arranged on the inner wall of the top of the working box 1, the spray head 402 is uniformly arranged on the lower surface of the annular water storage pipe 401, the water pump 403 is fixedly arranged on the left side of the working box 1, the water drain outlet of the water pump 403 is fixedly communicated with the water drain pipe 404, the upper end of the water drain pipe 404 is fixedly communicated with the annular water storage pipe 401, the water suction port of the water pump 403 is fixedly communicated with the water suction pipe 405, the lower end of the water suction pipe 405 is fixedly communicated with the left side of the working box 1, the guide plate 406 is fixedly connected with the inner wall of the left side of the working box 1, the guide plate 406 is positioned below the filter screen 5, the activated carbon adsorption plate 407 and the fine filter plate 408 are fixedly connected with the inner wall of the bottom of the working box 1, the active carbon adsorption plate 407 and the upper end of the fine filter plate 408 are fixedly connected with the lower surface of the guide plate 406, the active carbon adsorption plate 407 is positioned at the left side of the fine filter plate 408, water is firstly added from the water adding pipe 7 to the bottom of the working box 1, the water level and the working condition are checked through the front transparent observation window, the water pump 403 is started to pump water at the bottom of the working box 1 through the water pumping pipe 405 during crushing, the water is transmitted to the annular water storage pipe 401 through the water discharging pipe 404 for the spray head 402, the spray head 402 sprays water to degrade dust generated in the crushing process, the dust splash is avoided, a large amount of dust is generated when the building stone is crushed, the dust is scattered everywhere, if the dust is not treated timely, the surrounding environment is polluted, even the problem of harm to the health of human body is caused, the crushed building rubbish is discharged from the discharge outlet 2 along the filter screen 5, the water passes through the filter screen 5 and flows into the right side of the bottom of the working box 1 through the guide plate 406, and then the water is purified through the fine filter plate 408 and the activated carbon adsorption plate 407, and the purified water flows into the water supply pump 403 at the left side of the bottom of the working box 1 for use, so that the water source can be recycled in sequence, the waste of water resources is reduced, and the device is more environment-friendly and practical.
The crushing mechanism 6 comprises a protective shell 601, a motor 602, a first rotating rod 603, a second rotating rod 604, a first gear 605 and a second gear 606, wherein the protective shell 601 is fixedly arranged on the right side of the working box 1, the motor 602 is fixedly arranged on the inner wall of the right side of the protective shell 601, the first rotating rod 603 is fixedly connected with the left end of the output shaft of the motor 602, the left end of the first rotating rod 603 penetrates through the right side of the working box 1 and is rotatably connected to the left side of the working box 1 through a bearing, the second rotating rod 604 is horizontally arranged behind the first rotating rod 603, two ends of the second rotating rod 604 are rotatably connected to the left side and the right side of the working box 1 through the bearing respectively, crushing teeth are formed on the outer walls of the first rotating rod 603 and the second rotating rod 604, the crushing teeth on the first rotating rod 603 and the second rotating rod 604 are equidistantly staggered, the crushing teeth are equidistantly staggered, so that construction waste can be crushed thoroughly, the outer wall of the right end of the first rotating rod is fixedly sleeved with the first gear 605, the outer wall of the right end of the second rotating rod 604 is fixedly sleeved with the second gear 606, the first gear 605 and the second motor 606 are rotatably connected with the first gear 605, the second gear 606 is rotatably, the first rotating rod 605 and the second motor 606 are rotatably drives the first rotating rod 603 and the first rotating rod 604 to rotate, and the first gear 603 and the second rotating rod 604, and the second rotating rod 603 are rotatably, and the first rotating rod 603 and the second rotating rod 603.
The unloading mechanism 8 includes backup pad 801, electromagnetic plate 802, spring 803, the equal fixedly connected with backup pad 801 of left and right sides inner wall of working tank 1 and electromagnetic plate 802 are located the top of backup pad 801, the upper surface of two backup pads 801 is all fixedly connected with two springs 803 and the upper end of spring 803 is fixedly connected with the lower surface of electromagnetic plate 802, firstly pour the building waste that needs broken into from the feed inlet at working tank 1 top, drop on electromagnetic plate 802 because of the cause of gravity, can play the cushioning effect through setting up spring 803, alleviate the impact that electromagnetic plate 802 received, avoid electromagnetic plate 802 to be smashed bad by the stone, simultaneously electromagnetic plate 802 incessantly shake and can accelerate the speed that building waste falls, electromagnetic plate 802 circular telegram, hold materials such as the iron nail in the building waste, avoid the iron nail to enter into working tank 1 in direct contact with crushing tooth and lead to crushing tooth damage, the effective life who has delayed crushing tooth.
Further, crushing teeth are arranged on the outer walls of the first rotating rod 603 and the second rotating rod 604, and the crushing teeth on the first rotating rod 603 and the second rotating rod 604 are distributed in an equidistance and staggered manner, as shown in fig. 3, and the crushing teeth are distributed in an equidistance and staggered manner, so that the construction waste can be crushed more thoroughly.
Further, the filter screen 5 is located and keeps away from the slope of bin outlet 2 one side towards work box 1 top setting, as shown in fig. 1, and the construction waste that is intercepted on filter screen 5 can be under the effect of self gravity towards bin outlet 2 motion, is favorable to reducing the construction waste that is located on filter screen 5.
Further, valves are arranged on the water feeding pipe 7 and the sewage draining pipe 3, and as shown in fig. 1, the closing of the water feeding pipe 7 and the sewage draining pipe 3 can be controlled by arranging the valves.
Further, the rollers are fixedly installed at four corners of the lower surface of the working box 1, and as shown in fig. 1, the rollers are arranged to facilitate movement of the recovery device, so that the labor burden of workers is reduced.
Working principle: when the device is used, firstly, building waste to be crushed is poured from a feed inlet at the top of the working box 1, and falls down on the electromagnetic plate 802 due to gravity, the impact force born by the electromagnetic plate 802 can be reduced through the arrangement of the spring 803, so that the electromagnetic plate 802 is prevented from being broken by stones, meanwhile, the electromagnetic plate 802 continuously vibrates to accelerate the falling speed of the building waste, the electromagnetic plate 802 is electrified, iron nails and other materials in the building waste are sucked, the iron nails are prevented from directly contacting with crushing teeth in the working box 1 to damage the crushing teeth, and the service life of the crushing teeth is effectively prolonged; then, the motor 602 is started to drive the first rotating rod 603 and the first gear 605 to rotate, the first gear 605 rotates to drive the second gear 606 to rotate through meshing transmission so as to drive the second rotating rod 604 to rotate, and the first rotating rod 603 and the second rotating rod 604 simultaneously rotate to crush construction waste; firstly, water is added from the water adding pipe 7 to the bottom of the working box 1, the water level surface and the working condition are checked through the transparent observation window on the front, the water pump 403 is started to pump water at the bottom of the working box 1 through the water pumping pipe 405 during crushing, the water is transmitted to the annular water storage pipe 401 through the water discharging pipe 404 for the spray head 402 to be used, the spray head 402 can degrade dust generated in the crushing process, dust splash is avoided, a large amount of dust can be generated when the building stone is crushed in the patent number CN2020200941491, the dust can fly around, if the dust is not treated timely, the surrounding environment can be polluted, even the damage problem to the health of a human body is caused, the crushed building garbage is discharged from the discharge port 2 along the filter screen 5, the water passes through the filter screen 5 and flows into the right side of the bottom of the working box 1 through the guide plate 406, and is purified through the thin 408 and the activated carbon adsorption plate 407, the purified water flows into the water source 403 at the left side of the bottom of the working box 1, the water source can be recycled in sequence, and the waste of water resources is reduced, and the device is more environment-friendly and practical.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. Building waste recovery unit, including work box (1), its characterized in that: the automatic dust removing device is characterized in that a discharge hole (2) is formed in the right side of the working box (1), a drain pipe (3) is fixedly communicated with the bottom of the right side of the working box (1), a dust removing mechanism (4) is fixedly arranged at the bottom of an inner cavity of the working box (1), a filter screen (5) is fixedly connected to the inner walls of the left side and the right side of the working box (1), a crushing mechanism (6) is fixedly arranged in the working box (1), a water adding pipe (7) is fixedly communicated with the left side of the working box (1), a discharging mechanism (8) is fixedly arranged at the top of the inner cavity of the working box (1), and a cover plate (9) is hinged to the upper end of the working box (1) through a pin shaft;
the dust removing mechanism (4) comprises an annular water storage pipe (401), a spray head (402), a water pump (403), a drain pipe (404), a water pumping pipe (405), a guide plate (406), an activated carbon adsorption plate (407) and a fine filter plate (408), wherein the annular water storage pipe (401) is fixedly arranged on the inner wall of the top of the working box (1), the spray head (402) is uniformly arranged on the lower surface of the annular water storage pipe (401), the water pump (403) is fixedly arranged on the left side of the working box (1), the water discharging outlet of the water pump (403) is fixedly communicated with the drain pipe (404) and the upper end of the drain pipe (404) is fixedly communicated with the annular water storage pipe (401), the water pumping port of the water pump (403) is fixedly communicated with the water pumping pipe (405) and the lower end of the water pumping pipe (405) is fixedly communicated with the left side of the working box (1), the guide plate (406) is fixedly connected with the inner wall of the left side of the working box (1) and the guide plate (406) is positioned below the filter screen (5), the activated carbon adsorption plate (407) and the fine filter plate (408) are fixedly connected on the inner wall of the bottom of the working box (1), the upper ends of the activated carbon adsorption plate (407) and the fine filter plate (408) are fixedly connected with the lower surface of the guide plate (406), and the activated carbon adsorption plate (407) is positioned on the left side of the fine filter plate (408);
the smashing mechanism (6) comprises a protection shell (601), a motor (602), a first rotating rod (603), a second rotating rod (604), a first gear (605) and a second gear (606), wherein the protection shell (601) is fixedly installed on the right side of the working box (1), the motor (602) is fixedly installed on the inner wall of the right side of the protection shell (601), the left end of an output shaft of the motor (602) is fixedly connected with the first rotating rod (603) and the left end of the first rotating rod (603) penetrates through the right side of the working box (1) and is rotatably connected to the left side of the working box (1) through a bearing, the second rotating rod (604) is horizontally arranged at the rear of the first rotating rod (603) and two ends of the second rotating rod (604) are respectively rotatably connected to the left side and the right side of the working box (1) through bearings, the first gear (605) is fixedly sleeved on the outer wall of the right end of the first rotating rod (603), and the second gear (606) is fixedly sleeved on the outer wall of the right end of the second rotating rod (604).
Unloading mechanism (8) include backup pad (801), electromagnetic plate (802), spring (803), the equal fixedly connected with backup pad (801) of the left and right sides inner wall of work box (1) and electromagnetic plate (802) are located the top of backup pad (801), two equal fixedly connected with two springs (803) of upper surface of backup pad (801) and the upper end of spring (803) and the lower surface fixed connection of electromagnetic plate (802).
2. A construction waste recycling apparatus according to claim 1, wherein: crushing teeth are arranged on the outer walls of the first rotating rod (603) and the second rotating rod (604), and the crushing teeth on the first rotating rod (603) and the second rotating rod (604) are equidistantly and alternately distributed.
3. A construction waste recycling apparatus according to claim 1, wherein: the filter screen (5) is arranged at one side far away from the discharge port (2) and is obliquely arranged towards the top end of the working box (1).
4. A construction waste recycling apparatus according to claim 1, wherein: valves are arranged on the water adding pipe (7) and the sewage draining pipe (3).
5. A construction waste recycling apparatus according to claim 1, wherein: the first gear (605) and the second gear (606) are meshed for transmission.
6. A construction waste recycling apparatus according to claim 1, wherein: the front upper end of the working box (1) is provided with a sealing door through a hinge, and the front lower end of the working box (1) is provided with a transparent observation window.
7. A construction waste recycling apparatus according to claim 1, wherein: the four corners of the lower surface of the working box (1) are fixedly provided with idler wheels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222950413.9U CN219024486U (en) | 2022-11-07 | 2022-11-07 | Building waste recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222950413.9U CN219024486U (en) | 2022-11-07 | 2022-11-07 | Building waste recovery device |
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| Publication Number | Publication Date |
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| CN219024486U true CN219024486U (en) | 2023-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222950413.9U Active CN219024486U (en) | 2022-11-07 | 2022-11-07 | Building waste recovery device |
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| CN (1) | CN219024486U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117206004A (en) * | 2023-10-26 | 2023-12-12 | 杭州奥兴筑友科技有限公司 | Aerated block crushing device and method |
-
2022
- 2022-11-07 CN CN202222950413.9U patent/CN219024486U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117206004A (en) * | 2023-10-26 | 2023-12-12 | 杭州奥兴筑友科技有限公司 | Aerated block crushing device and method |
| CN117206004B (en) * | 2023-10-26 | 2024-03-22 | 杭州奥兴筑友科技有限公司 | Aerated block crushing device and method |
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