CN215694304U - Prevent building rubbish recovery breaker of raise dust - Google Patents
Prevent building rubbish recovery breaker of raise dust Download PDFInfo
- Publication number
- CN215694304U CN215694304U CN202120121025.2U CN202120121025U CN215694304U CN 215694304 U CN215694304 U CN 215694304U CN 202120121025 U CN202120121025 U CN 202120121025U CN 215694304 U CN215694304 U CN 215694304U
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- Prior art keywords
- wall
- crushing box
- crushing
- fixedly connected
- sleeved
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- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 31
- 239000000428 dust Substances 0.000 title claims abstract description 22
- 238000011084 recovery Methods 0.000 title description 2
- 239000002699 waste material Substances 0.000 claims abstract description 47
- 238000010276 construction Methods 0.000 claims abstract description 44
- 238000004064 recycling Methods 0.000 claims abstract description 17
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 4
- 230000006378 damage Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Crushing And Pulverization Processes (AREA)
Abstract
The utility model discloses a dust-raising-prevention construction waste recycling and crushing device which comprises a crushing box, wherein two first round rods are rotatably connected between the inner walls of the two sides of the crushing box, a rotating plate is sleeved on the outer walls of the two first round rods, the inner walls of the two sides of the crushing box are fixedly connected with first fixing seats, the outer walls of the two first fixing seats are rotatably connected with first telescopic rods, one ends of the two first telescopic rods are rotatably connected with second fixing seats, one sides of the two second fixing seats are fixedly connected with one side of the rotating plate, first springs are sleeved on the outer walls of the two first telescopic rods, and inclined plates are fixedly connected with the inner walls of the two sides of the crushing box. Compared with the existing device, the device is provided with the rotating plate, the first fixed seat, the first telescopic rod, the second fixed seat and the first spring, and the device is used for sealing the building garbage feeding port, so that dust is prevented from being raised, the surrounding environment is prevented from being polluted, and the breathing health of workers is ensured.
Description
Technical Field
The utility model relates to the technical field of buildings, in particular to a dust-raising-prevention building garbage recycling and crushing device.
Background
The construction waste occupies a large amount of land, causes serious environmental pollution, damages soil structures and causes ground surface settlement, however, most of the construction waste is transported to suburbs or villages by construction units without any treatment and is piled or buried in the open air, but when the waste is cleaned, the waste is firstly crushed for shipment. And the prior art device does not prevent the raise dust to it when smashing building rubbish and handle, has seriously influenced air quality, causes very big harm to staff's health simultaneously.
Through retrieval, chinese patent granted publication No. CN210386098U discloses a construction waste crushing device, which comprises a second motor, a first rotating rod, a crushing roller, a first blade, a first motor, a second rotating rod, and a second blade device. The building rubbish reducing mechanism in above-mentioned patent exists following not enough: through starting the second motor, drive first rotary rod and rotate, drive and smash the roller and rotate to smash building rubbish through first blade, rubbish after smashing drives second rotary rod through first motor, thereby carry out the regrinding to rubbish through the second blade, nevertheless this device does not handle its raise dust prevention when smashing building rubbish, has seriously influenced air quality, causes very big harm to staff's health simultaneously.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects in the prior art and provides a dust-proof construction waste recycling and crushing device.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a dust-proof construction waste recycling and crushing device comprises a crushing box, wherein two first round rods are rotatably connected between the inner walls of the two sides of the crushing box, the outer walls of the two first round rods are sleeved with a rotating plate, the inner walls of the two sides of the crushing box are fixedly connected with first fixed seats, the outer walls of the two first fixed seats are rotatably connected with first telescopic rods, one ends of the two first telescopic rods are rotatably connected with second fixed seats, one sides of the two second fixed seats are fixedly connected with one side of the rotating plate, the outer walls of the two first telescopic rods are sleeved with first springs, the inner walls of the two sides of the crushing box are fixedly connected with inclined plates, one side of the crushing box is provided with two first through holes, the crushing box is rotatably connected with a first rotating shaft and a second rotating shaft at the first through holes, and the outer walls of the first rotating shaft and the outer walls of the second rotating shaft are both sleeved with crushing rollers, the outer wall of one side of crushing case fixedly connected with motor, one end and the one end fixed connection of first pivot on the output shaft of motor.
Further, the outer wall of first pivot and the outer wall of second pivot all overlap and are equipped with gear, two gear intermeshing, the both sides inner wall of smashing the case all is fixed even has the arc.
Further, smash the equal fixedly connected with arc seat of both sides inner wall of case, it is connected with same second round bar to rotate between the both sides inner wall of case to smash, the outer wall cover of second round bar is equipped with the sieve, smash one side inner wall fixedly connected with second telescopic link of case, the one end of second telescopic link is rotated and is connected with the third fixing base, one side of third fixing base and one side fixed connection of sieve, the outer wall cover of second telescopic link is equipped with the second spring.
Furthermore, a second through hole is formed in one side of the crushing box, a third rotating shaft is rotatably connected to the crushing box in the second through hole, a cam is sleeved on the outer wall of the third rotating shaft, a driving wheel is sleeved on the outer wall of an output shaft of the motor, and a driven wheel is sleeved on the outer wall of the third rotating shaft.
Furthermore, the outer wall of action wheel and the outer wall cover from the driving wheel are equipped with same conveyer belt.
Furthermore, a third through hole is formed in one side of the crushing box, a filter screen is fixedly connected to the crushing box at the third through hole, a fan is fixedly mounted at the third through hole of the crushing box, a collecting box is arranged on the outer wall of one side of the crushing box, a fourth through hole is formed in one side of the collecting box, a guide pipe is fixedly connected to the collecting box at the fourth through hole, and one end of the guide pipe is fixedly connected with the third through hole.
The utility model has the beneficial effects that:
1. by arranging the crushing box, the first round bar, the rotating plate, the first fixed seat, the first telescopic rod, the second fixed seat, the first spring, the inclined plate, the first rotating shaft, the second rotating shaft, the crushing rollers, the motor, the gear and the arc-shaped plate, the building garbage to be crushed is poured into the crushing box, the rotating plate rotates around the first round bar under the self gravity of the building garbage, the first telescopic rod rotates simultaneously when being contracted under the cooperation of the first fixed seat and the second fixed seat, so that the building garbage slides to the lower part of the arc-shaped plate, the motor is started, the first rotating shaft and the second rotating shaft rotate oppositely through the two gears, the building garbage is crushed through the two crushing rollers, the blockage problem caused by the garbage plugged at the rotating end of the rotating plate can be avoided through the inclined plate, the aim of sealing the building garbage feeding port is achieved, and the dust is prevented from being raised, the pollution to the surrounding environment is caused, so that the breathing health of workers is ensured;
2. by arranging the arc-shaped seat, the second round rod, the sieve plate, the second telescopic rod, the third fixed seat, the second spring, the third rotating shaft, the cam and the rotating door, the crushed construction waste completely falls onto the sieve plate through the arc-shaped seat, the third rotating shaft is driven to rotate through the first rotating shaft, thereby driving the cam to rotate, leading the cam to intermittently push the sieve plate and leading the sieve plate to rotate around the second round rod, under the coordination of the second telescopic rod, the third fixed seat and the second spring, the sieve plate can shake up and down, the crushed construction waste is screened, the construction waste which is sufficiently crushed is discharged by opening the rotary door, the construction waste which is not sufficiently crushed slides out of one side of the crushing box through the sieve plate, and is finally poured into the crushing box again through the external conveying device for secondary crushing, so that the construction waste can be crushed to reach the standard, and the construction waste is convenient to subsequently recycle;
3. through having set up the filter screen, the fan, the collecting box, the pipe, absorb the dust of overwhelming majority and the stone of tiny granule through the fan, filter other impurity through the filter screen, avoid inhaling great impurity and leading to damaging the fan, through the pipe in with the leading-in collecting box of dust, mix the final discharge with the dust through the water in the collecting box, the inside and outside circulation of air is realized to the water inlet through the collecting box, finally reach the dust fall effect, reached and to have guaranteed the kibbling operational environment of building rubbish, avoid the dust to raise and cause the pollution to the environment.
Drawings
Fig. 1 is a schematic perspective view of a crushing box of a dust-proof construction waste recycling and crushing device provided in embodiment 1;
fig. 2 is a schematic front view of a crushing box of the dust-proof construction waste recycling and crushing device in embodiment 1;
fig. 3 is a schematic structural diagram of an internal structure of a crushing box of the dust-proof construction waste recycling and crushing device provided in embodiment 1;
fig. 4 is a rear view of the structure of the crushing box of the dust-proof construction waste recycling and crushing device provided in embodiment 1;
fig. 5 is a schematic structural diagram of an internal structure of a crushing box of the dust-proof construction waste recycling and crushing device provided in embodiment 2.
In the figure: smash case 1, first round bar 2, rotor plate 3, first fixing base 4, first telescopic link 5, second fixing base 6, first spring 7, swash plate 8, first pivot 9, second pivot 10, crushing roller 11, motor 12, gear 13, arc 14, arc 15, second round bar 16, sieve 17, second telescopic link 18, third fixing base 19, second spring 20, third pivot 21, cam 22, revolving door 23, filter screen 24, fan 25, collecting box 26, pipe 27.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1
Referring to fig. 1-4, a dust-proof construction waste recycling and crushing device comprises a crushing box 1, wherein two first round bars 2 are rotatably connected between the inner walls of the two sides of the crushing box 1, a rotating plate 3 is sleeved on the outer walls of the two first round bars 2, the inner walls of the two sides of the crushing box 1 are fixedly connected with first fixed seats 4, the outer walls of the two first fixed seats 4 are rotatably connected with first telescopic rods 5, one ends of the two first telescopic rods 5 are rotatably connected with second fixed seats 6, one sides of the two second fixed seats 6 are fixedly connected with one sides of the rotating plate 3, the outer walls of the two first telescopic rods 5 are sleeved with first springs 7, the inner walls of the two sides of the crushing box 1 are fixedly connected with inclined plates 8, one side of the crushing box 1 is provided with two first through holes, the crushing box 1 is rotatably connected with a first rotating shaft 9 and a second rotating shaft 10 at the first through holes, the outer wall of the first rotating shaft 9 and the outer wall of the second rotating shaft 10 are both sleeved with crushing rollers 11, the outer wall of one side of the crushing box 1 is fixedly connected with a motor 12, one end of an output shaft of the motor 12 is fixedly connected with one end of the first rotating shaft 9, the outer wall of the first rotating shaft 9 and the outer wall of the second rotating shaft 10 are both sleeved with gears 13, the two gears 13 are meshed with each other, the inner walls of the two sides of the crushing box 1 are both fixedly connected with arc-shaped plates 14, under the self gravity of construction waste, the rotating plate 3 rotates around the first round rod 2, under the matching of the first fixing seat 4 and the second fixing seat 6, the first telescopic rod 5 rotates simultaneously when being contracted, so that the construction waste slides below the arc-shaped plates 14, the first rotating shaft 9 and the second rotating shaft 10 rotate oppositely through the two gears 13 by starting the motor 12, and then the construction waste is crushed through the two crushing rollers 11, can avoid 3 rotation end departments of rotor plate to fill in through swash plate 8 and have rubbish lead to blockking up the problem, reach and to have sealed to building rubbish pan feeding mouth, avoided causing the dust to raise, cause the pollution to the surrounding environment to staff's breathing is healthy.
Wherein, the inner walls of the two sides of the crushing box 1 are fixedly connected with arc-shaped seats 15, the same second round bar 16 is rotatably connected between the inner walls of the two sides of the crushing box 1, the outer wall of the second round bar 16 is sleeved with a sieve plate 17, the inner wall of one side of the crushing box 1 is fixedly connected with a second telescopic rod 18, one end of the second telescopic rod 18 is rotatably connected with a third fixed seat 19, one side of the third fixed seat 19 is fixedly connected with one side of the sieve plate 17, the outer wall of the second telescopic rod 18 is sleeved with a second spring 20, one side of the crushing box 1 is provided with a second through hole, the crushing box 1 is rotatably connected with a third rotating shaft 21 at the second through hole, the outer wall of the third rotating shaft 21 is sleeved with a cam 22, the outer wall of an output shaft of the motor 12 is sleeved with a driving wheel, the outer wall of the third rotating shaft 21 is sleeved with a driven wheel, the outer wall of the driving wheel is sleeved with the same conveyor belt, make on the whole sieve 17 that drops of building rubbish after smashing through arc seat 15, it rotates to drive third pivot 21 through first pivot 9, thereby drive cam 22 and rotate, make cam 22 intermittent type promote sieve 17, make sieve 17 surround second round bar 16 and rotate, at second telescopic link 18, third fixing base 19, under the cooperation of second spring 20, make sieve 17 shake from top to bottom, thereby sieve the building rubbish after smashing, smash abundant building rubbish and discharge through opening swing door 23, the abundant building rubbish of smashing passes through the one side that the sieve 17 roll-off smashed case 1, finally pour once more in smashing case 1 through outside conveyor and smash once more, reached and to have made building rubbish smash and reach the standard, be convenient for subsequent recycle.
The working principle is as follows: when in use, the construction waste to be crushed is poured into the crushing box 1, the rotating plate 3 rotates around the first round rod 2 under the self gravity of the construction waste, the first telescopic rod 5 rotates simultaneously when being contracted under the matching of the first fixing seat 4 and the second fixing seat 6, so that the construction waste slides to fall under the arc-shaped plate 14, the first rotating shaft 9 and the second rotating shaft 10 rotate oppositely through the two gears 13 by starting the motor 12, the construction waste is crushed through the two crushing rollers 11, the blockage problem caused by the blockage of the waste plugged at the rotating end of the rotating plate 3 can be avoided through the inclined plate 8, the sealing of a feeding port of the construction waste is realized, the dust is prevented from being raised, the pollution to the surrounding environment is prevented, the breathing health of workers is ensured, and the crushed construction waste completely falls on the sieve plate 17 through the arc-shaped seat 15, drive third pivot 21 through first pivot 9 and rotate, thereby it rotates to drive cam 22, make cam 22 intermittent type promote sieve 17, make sieve 17 revolve around second round bar 16 and rotate, at second telescopic link 18, third fixing base 19, under the cooperation of second spring 20, make sieve 17 shake from top to bottom, thereby the building rubbish after smashing sieves, the building rubbish after smashing fully is discharged through opening swing door 23, the one side of smashing case 1 through sieve 17 roll-off of not smashing abundant building rubbish, finally pour once more in smashing case 1 through outside conveyor and smash once more, reached and to have made building rubbish smash and reach the standard, be convenient for subsequent recycle.
Example 2
Referring to fig. 5, a dustproof construction waste recycling and crushing device, this embodiment compares in embodiment 1, in order to guarantee the kibbling operational environment of construction waste, the third through-hole has been seted up to one side of crushing case 1, crushing case 1 is at third through-hole fixedly connected with filter screen 24, crushing case 1 is at third through-hole fixedly mounted with fan 25, one side outer wall of crushing case 1 is equipped with collecting box 26, the fourth through-hole has been seted up to one side of collecting box 26, collecting box 26 is at fourth through-hole fixedly connected with pipe 27, the one end and the third through-hole fixed connection of pipe 27.
The working principle is as follows: when in use, the construction waste to be crushed is poured into the crushing box 1, the rotating plate 3 rotates around the first round rod 2 under the self gravity of the construction waste, the first telescopic rod 5 rotates simultaneously when being contracted under the matching of the first fixing seat 4 and the second fixing seat 6, so that the construction waste slides to fall below the arc-shaped plate 14, the first rotating shaft 9 and the second rotating shaft 10 rotate oppositely through the two gears 13 by starting the motor 12, the construction waste is crushed through the two crushing rollers 11, the blockage problem caused by the blockage of the waste plugged at the rotating end of the rotating plate 3 can be avoided through the inclined plate 8, the sealing of a feeding port of the construction waste is realized, the dust rising is avoided, the pollution to the surrounding environment is avoided, the breathing health of workers is ensured, the dust and the tiny particles are absorbed through the fan 25, other impurities are filtered through the filter screen 24, avoid sucking larger impurity and causing damage fan 25, lead into the collecting box 26 with the dust through pipe 27, mix through the water in the collecting box 26 with the dust and finally discharge, realize inside and outside circulation of air through the water inlet of collecting box 26, finally reach the dust fall effect, reached and can guarantee the kibbling operational environment of construction waste, avoid the dust to raise and cause the pollution to the environment, make the whole construction waste after smashing drop on the sieve 17 through the arc seat 15, drive the third pivot 21 to rotate through the first pivot 9, thus drive the cam 22 to rotate, make the cam 22 promote the sieve 17 intermittently, make the sieve 17 surround the second round bar 16 to rotate, under the cooperation of second telescopic link 18, third fixed seat 19, second spring 20, make the sieve 17 shake up and down, thus sieve the construction waste after smashing, the construction waste after smashing fully is discharged through opening the rotating door 23, not smash abundant building rubbish and pass through sieve 17 roll-off and smash one side of case 1, finally pour once more into through outside conveyor and smash once more in smashing case 1, reached and to have enabled building rubbish to smash and reach the standard, be convenient for subsequent recycle.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (6)
1. The dust-proof construction waste recycling and crushing device comprises a crushing box (1) and is characterized in that two first round rods (2) are rotatably connected between the inner walls of the two sides of the crushing box (1), a rotating plate (3) is sleeved on the outer walls of the two first round rods (2), the inner walls of the two sides of the crushing box (1) are fixedly connected with first fixed seats (4), the outer walls of the two first fixed seats (4) are rotatably connected with first telescopic rods (5), one ends of the two first telescopic rods (5) are rotatably connected with second fixed seats (6), one sides of the two second fixed seats (6) are fixedly connected with one side of the rotating plate (3), the outer walls of the two first telescopic rods (5) are sleeved with first springs (7), inclined plates (8) are fixedly connected with the inner walls of the two sides of the crushing box (1), one side of the crushing box (1) is provided with two first through holes, smash case (1) and rotate in first through-hole department and be connected with first pivot (9) and second pivot (10), the outer wall of first pivot (9) and the outer wall of second pivot (10) all overlap and are equipped with crushing roller (11), one side outer wall fixedly connected with motor (12) of crushing case (1), the one end fixed connection of one end and first pivot (9) on the output shaft of motor (12).
2. A dustproof construction waste recycling and crushing device according to claim 1, wherein gears (13) are sleeved on the outer wall of the first rotating shaft (9) and the outer wall of the second rotating shaft (10), the two gears (13) are meshed with each other, and arc-shaped plates (14) are fixedly connected to the inner walls of the two sides of the crushing box (1).
3. The dustproof construction waste recycling and crushing device as claimed in claim 1, wherein the inner walls of two sides of the crushing box (1) are fixedly connected with arc-shaped seats (15), the inner walls of two sides of the crushing box (1) are rotatably connected with a same second round rod (16), a sieve plate (17) is sleeved on the outer wall of the second round rod (16), a second telescopic rod (18) is fixedly connected with the inner wall of one side of the crushing box (1), one end of the second telescopic rod (18) is rotatably connected with a third fixed seat (19), one side of the third fixed seat (19) is fixedly connected with one side of the sieve plate (17), and a second spring (20) is sleeved on the outer wall of the second telescopic rod (18).
4. The building rubbish recycling and crushing device capable of preventing dust rising as claimed in claim 1, wherein a second through hole is formed in one side of the crushing box (1), a third rotating shaft (21) is rotatably connected to the second through hole of the crushing box (1), a cam (22) is sleeved on the outer wall of the third rotating shaft (21), a driving wheel is sleeved on the outer wall of an output shaft of the motor (12), and a driven wheel is sleeved on the outer wall of the third rotating shaft (21).
5. The construction waste recycling and crushing device capable of preventing dust according to claim 4, wherein the same conveyor belt is sleeved on the outer wall of the driving wheel and the outer wall of the driven wheel.
6. The construction waste recycling and crushing device capable of preventing dust emission according to claim 1, wherein a third through hole is formed in one side of the crushing box (1), a filter screen (24) is fixedly connected to the third through hole of the crushing box (1), a fan (25) is fixedly installed at the third through hole of the crushing box (1), a collecting box (26) is arranged on the outer wall of one side of the crushing box (1), a fourth through hole is formed in one side of the collecting box (26), a guide pipe (27) is fixedly connected to the collecting box (26) at the fourth through hole, and one end of the guide pipe (27) is fixedly connected to the third through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120121025.2U CN215694304U (en) | 2021-01-18 | 2021-01-18 | Prevent building rubbish recovery breaker of raise dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120121025.2U CN215694304U (en) | 2021-01-18 | 2021-01-18 | Prevent building rubbish recovery breaker of raise dust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215694304U true CN215694304U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120121025.2U Expired - Fee Related CN215694304U (en) | 2021-01-18 | 2021-01-18 | Prevent building rubbish recovery breaker of raise dust |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215694304U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301336A (en) * | 2022-07-27 | 2022-11-08 | 枣庄鑫金山智能装备有限公司 | Hydraulic composite roller type crusher |
-
2021
- 2021-01-18 CN CN202120121025.2U patent/CN215694304U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301336A (en) * | 2022-07-27 | 2022-11-08 | 枣庄鑫金山智能装备有限公司 | Hydraulic composite roller type crusher |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220201 |
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| CF01 | Termination of patent right due to non-payment of annual fee |