CN115780244A - Building grit sieving mechanism - Google Patents
Building grit sieving mechanism Download PDFInfo
- Publication number
- CN115780244A CN115780244A CN202211637631.5A CN202211637631A CN115780244A CN 115780244 A CN115780244 A CN 115780244A CN 202211637631 A CN202211637631 A CN 202211637631A CN 115780244 A CN115780244 A CN 115780244A
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- hopper
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- 238000007873 sieving Methods 0.000 title claims description 7
- 238000012216 screening Methods 0.000 claims abstract description 47
- 239000004576 sand Substances 0.000 claims abstract description 42
- 239000004575 stone Substances 0.000 claims abstract description 21
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000007790 scraping Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 17
- 239000000428 dust Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 9
- 230000010405 clearance mechanism Effects 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000007664 blowing Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000003595 mist Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention relates to a screening device, in particular to a building sandstone screening device. The invention aims to provide a building sandstone screening device which can scrape off sand grains stained on the surface of stones. The invention provides a building gravel screening device which comprises a discharge hopper, a feed hopper, a screening mechanism, a vibrating mechanism and a cleaning mechanism, wherein the discharge hopper and the feed hopper are arranged on the screening mechanism, the feed hopper is positioned above the discharge hopper, the vibrating mechanism for vibrating and screening gravel is arranged at the bottom of the screening mechanism, and the cleaning mechanism for scraping sand grains stuck on stones is arranged on the right side of the vibrating mechanism. The positive and negative rotation of the gear can drive the brush to rotate positively and negatively, and when sand passes through the brush, the brush can scrape sand grains attached to the surface of stones, so that the sand can be primarily separated, and the screening effect is good.
Description
Technical Field
The invention relates to a screening device, in particular to a building sandstone screening device.
Background
Sandstone refers to a loose mixture of sand and broken stones, is often used as a high-quality building material and a concrete raw material due to good hardness and stable chemical properties of the sandstone, and is used for screening stones and sand in silt to be used for manufacturing building concrete.
Patent application CN211359581U, published as 20200828, discloses a building sandstone screening device, which comprises a case, wherein the top of the case is fixedly connected with a feed hopper, one side of the case is provided with a coarse sand port, one side of the case, which is far away from the coarse sand port, is provided with a medium sand port, the bottom of the case is provided with a fine sand port, a screening mechanism is arranged inside the case, and one side of the screening mechanism is provided with a vibrating mechanism; the invention has the beneficial effects that: be equipped with screening mechanism in this building grit sieving mechanism, moreover, the steam generator is simple in structure, be fit for the construction of minizone, the operator is as long as pour the grit into the feeder hopper, the coarse sand can be sieved the back through first screen cloth and discharge from the coarse sand mouth, well sand is discharged from the middle sand mouth after the second screen cloth sieves, remaining fine sand is discharged from the fine sand mouth, and the export of three kinds of grit has been established in the direction of three differences, conveniently sieve the back and carry out categorised use to the grit, so that form the higher concrete of intensity, potential safety hazard has been reduced and has been built. Although above-mentioned patent can be screened the grit, at the screening in-process, be difficult to scrape off the grit that is stained with on the stone surface, the screening effect is not good.
When screening sand to above-mentioned patent, generally can not scrape the sand grain that is stained with on the stone surface, the problem that the screening effect is not good, so at present the urgent need one kind can be with being stained with the building grit sieving mechanism that scrapes at the sand grain on stone surface for solve above-mentioned problem.
Disclosure of Invention
In order to overcome the defects that the existing building gravel screening device can not scrape off sand particles stained on the surface of stones generally and has poor screening effect, the invention aims to provide the building gravel screening device which can scrape off the sand particles stained on the surface of stones.
The invention is realized by the following technical approaches:
the utility model provides a building grit sieving mechanism, is equipped with out hopper and feeder hopper including going out hopper, feeder hopper, screening mechanism, vibration mechanism and clearance mechanism on the screening mechanism, the feeder hopper is located the top of a hopper, and screening mechanism bottom is provided with the vibration mechanism who is used for carrying out the vibration screening to the grit, and the vibration mechanism right side is provided with the clearance mechanism that is used for scraping the sand grain that will glue on stone.
In one embodiment, the screening mechanism comprises a discharge box, sieve plates and baffles, the discharge box and the feed hopper are both arranged on the rear side of the discharge box, the three sieve plates are uniformly connected to the inner side of the discharge box at intervals, and the three baffles are rotatably arranged on the left part of the front side of the discharge box at intervals.
In one embodiment, the vibration mechanism comprises a base, an elastic part, a vibrator and a sliding frame, the sliding frame is connected to the bottom of the emptying box, the base is arranged on the lower portion of the sliding frame in a sliding mode, the vibrator is connected to the middle of the top of the base, the top of a telescopic rod of the vibrator is connected with the sliding frame, and the elastic part is connected between the base and the sliding frame in a bilateral symmetry mode.
In one embodiment, the cleaning mechanism comprises a rack, a fixing plate, a brush and a gear, the rack is connected to the lower portion of one side of the base, the fixing plate is connected to the right side of the upper portion of the discharging box, the brush is rotatably arranged in the middle of the fixing plate and located on the upper side of the inner portion of the discharging box, the gear is connected to the right side of the brush, and the gear is meshed with the rack.
In one of them embodiment, still including the dust removal mechanism that is used for removing dust to blowing incasement portion, dust removal mechanism is including the water tank, press the pressure pump, the conveyer pipe, connecting block and atomizer, one side sub-unit connection that the base is close to the rack has the water tank, water tank top rear side is connected with presses the pressure pump and communicates, press the drive shaft and the carriage of pressure pump to be connected, press the pump rear side to be connected with the conveyer pipe and communicate, the top front side is connected with the connecting block in the play hopper, be connected with atomizer on the connecting block, the conveyer pipe upper end is connected with atomizer and communicates.
In one embodiment, the sand drying device further comprises a drying mechanism for drying sand, the drying mechanism comprises an air heater, a connecting pipe and a protective cover, the front part of one side, away from the rack, of the base is connected with the air heater, the top of the air heater is connected with the connecting pipe and communicated with the connecting pipe, the upper end of the connecting pipe penetrates through the left side of the emptying box, the upper end of the connecting pipe is connected with the protective cover, and the protective cover is located inside the emptying box.
In one embodiment, the automatic feeding device further comprises a conveying mechanism for feeding, the conveying mechanism comprises a discharging hopper, a connecting shell, a threaded rod, a motor and elastic cloth, the discharging hopper is connected to the rear portion of the left side of the base, the connecting shell is connected to the discharging hopper, the motor is connected to the left side of the upper portion of the connecting shell, the threaded rod is connected to the bottom of an output shaft of the motor, the threaded rod is located inside the connecting shell, and the elastic cloth is connected between the upper portion of the connecting shell and the top of the feeding hopper.
In one embodiment, the discharge hopper is arranged obliquely.
Compared with the prior art, the invention has the following advantages:
1. the positive and negative rotation of the gear can drive the brush to rotate positively and negatively, and when sand passes through the brush, the brush can scrape sand grains attached to the surface of stones, so that the sand can be primarily separated, and the screening effect is good.
2. When the sliding frame reciprocates up and down, the pressing pump can be driven to work, the pressing pump can convey water in the water tank to the atomizing nozzle through the conveying pipe, and the atomizing nozzle can spray water mist in the discharging box, so that the aim of removing dust is fulfilled.
3. According to the invention, by starting the hot air blower, the hot air blower can blow hot air upwards, so that the hot air can be blown into the discharging box through the connecting pipe, sand in the discharging box can be dried, wet sand grains are prevented from being attached to the stones, and the stones and the sand grains can be better separated subsequently.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic perspective view of the discharge hopper and the feed hopper of the present invention.
Fig. 3 is a schematic perspective view of the screening mechanism and the vibrating mechanism of the present invention.
Fig. 4 is a schematic perspective view of the discharge box and the screen plate of the present invention.
FIG. 5 is a perspective view of the cleaning mechanism of the present invention.
Fig. 6 is a perspective view of a gear and the like according to the present invention.
Fig. 7 is a schematic perspective view of the dust removing mechanism of the present invention.
Fig. 8 is a schematic perspective view of the drying mechanism of the present invention.
Fig. 9 is a schematic perspective view of the conveying mechanism of the present invention.
Labeled as: 1-discharge hopper, 2-feed hopper, 3-screening mechanism, 31-discharge hopper, 32-sieve plate, 33-baffle plate, 4-vibration mechanism, 41-base, 42-elastic piece, 43-vibrator, 44-sliding frame, 5-cleaning mechanism, 51-rack, 52-fixed plate, 53-hairbrush, 54-gear, 6-dust-removing mechanism, 61-water tank, 62-pressing pump, 63-conveying pipe, 64-connecting block, 65-atomizing nozzle, 7-drying mechanism, 71-hot air blower, 72-connecting pipe, 73-protective cover, 8-conveying mechanism, 81-discharge hopper, 82-connecting shell, 83-threaded rod, 84-motor and 85-elastic cloth.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
Example 1
The utility model provides a building grit sieving mechanism, refer to and show in fig. 1-6, including going out hopper 1, feeder hopper 2, screening mechanism 3, vibration mechanism 4 and clearance mechanism 5, be equipped with out hopper 1 and feeder hopper 2 on the screening mechanism 3, go out hopper 1 and set up for the slope, feeder hopper 2 is located the top of going out hopper 1, and 3 bottoms of screening mechanism are provided with vibration mechanism 4, and 4 right sides of vibration mechanism are provided with clearance mechanism 5.
Referring to fig. 1, 3 and 4, the screening mechanism 3 includes a material discharge box 31, a sieve plate 32 and a baffle 33, the material discharge box 1 and the material discharge box 2 are both installed at the rear side of the material discharge box 31, three sieve plates 32 are welded at the inner side of the material discharge box 31 at uniform intervals, the sieve plates 32 can screen sand and stones through up-and-down movement, and the three baffles 33 are rotatably arranged at the left part of the front side of the material discharge box 31 at uniform intervals.
Referring to fig. 1 and 3, the vibration mechanism 4 includes a base 41, an elastic member 42, a vibrator 43, and a sliding frame 44, the sliding frame 44 is welded at the bottom of the material placing box 31, the base 41 is slidably disposed at the lower portion of the sliding frame 44, the vibrator 43 is connected to the middle of the top of the base 41, the top of the telescopic rod of the vibrator 43 is connected to the sliding frame 44, and the elastic member 42 is symmetrically connected between the base 41 and the sliding frame 44.
Referring to fig. 2, 5 and 6, cleaning mechanism 5 is including rack 51, fixed plate 52, brush 53 and gear 54, base 41 right side lower part welding has rack 51, blowing case 31 upper portion right side welding has fixed plate 52, fixed plate 52 middle part rotary type is provided with brush 53, brush 53 is located the inside upside of blowing case 31, brush 53 just reverse rotation can be scraped the sand grain that is stained with on the stone surface, thereby can carry out preliminary separation to grit, brush 53 right side is connected with gear 54, gear 54 and rack 51 meshing.
When the device needs to be used, people place the device at a specified position firstly, then pour a proper amount of gravel into the feed hopper 2, make the gravel fall inside the discharge box 31, then people start the vibrator 43, the telescopic rod of the vibrator 43 can extend and shorten in a reciprocating manner, drive the sliding frame 44 to move up and down, the elastic piece 42 can deform adaptively, play a role in shock absorption, the sliding frame 44 can drive the discharge box 31 to move up and down by moving up and down, the discharge box 31 can drive the fixed plate 52 to move up and down, the fixed plate 52 can drive the brush 53 to move up and down, the brush 53 can drive the gear 54 to move up and down by moving up and down, under the action of the rack 51, the gear 54 can drive the brush 53 to rotate forward and backward, when the gravel passes through the brush 53, the brush 53 can scrape sand particles stained on the surface of the stone, thereby can primarily separate the gravel, meanwhile, the discharge box 31 can drive the sieve plate 32 to move up and down, three sieve plates 32 can carry out three times, the sand particles can fall through the discharge hopper 1, the sieve plate can be collected by manual operation, the sieve plate 33 can be closed, and the screen plate 33 can be collected.
Example 2
On the basis of embodiment 1, refer to fig. 1 and 7 for illustration, still include dust removal mechanism 6, dust removal mechanism 6 includes water tank 61, press the force pump 62, conveyer pipe 63, connecting block 64 and atomizer 65, base 41 right side lower part welding has water tank 61, water tank 61 top rear side is connected with press the force pump 62 and communicates, the drive shaft and the carriage 44 of press the force pump 62 are connected, press the force pump 62 rear side to be connected with conveyer pipe 63 and communicate, it has connecting block 64 to weld the connecting block 64 to go out the top front side in hopper 1, be connected with atomizer 65 on the connecting block 64, the conveyer pipe 63 upper end is connected with atomizer 65 and communicates, atomizer 65 can spout water smoke in blowing case 31, thereby reach the purpose of dust removal.
When the device is needed, people pour a proper amount of water into the water tank 61 firstly, when the sliding frame 44 moves up and down in a reciprocating mode, the pressing pump 62 can be driven to work, the pressing pump 62 can convey the water in the water tank 61 into the atomizing nozzle 65 through the conveying pipe 63, and the atomizing nozzle 65 can spray the water mist into the discharging tank 31, so that the dust removal purpose is achieved.
Referring to fig. 1 and 8, still including drying mechanism 7, drying mechanism 7 is including air heater 71, connecting pipe 72 and protection casing 73, base 41 left side front portion welding has air heater 71, air heater 71 can up blow hot-blastly to can dry the grit in blowing case 31, avoid moist sand grain to be stained with on the stone, air heater 71 top is connected with connecting pipe 72 and intercommunication, the connecting pipe 72 upper end runs through the blowing case 31 left side, the connecting pipe 72 upper end is connected with protection casing 73, protection casing 73 is located inside the blowing case 31.
When needs use the device, can start air heater 71, air heater 71 can up blow hot-blastly for it is hot-blastly in blowing case 31 through connecting pipe 72, thereby can dry the grit in blowing case 31, avoids moist sand grain to be stained with on the stone, makes follow-up can be better separate stone and sand grain, and after the stoving was accomplished, it can to close air heater 71.
Referring to fig. 1 and 9, the conveying mechanism 8 is further included, the conveying mechanism 8 includes a discharging hopper 81, a connecting shell 82, a threaded rod 83, a motor 84 and elastic cloth 85, the discharging hopper 81 is welded at the rear portion of the left side of the base 41, the connecting shell 82 is welded on the discharging hopper 81, the motor 84 is bolted on the left side of the upper portion of the connecting shell 82, the threaded rod 83 is connected to the bottom of an output shaft of the motor 84, the threaded rod 83 is located inside the connecting shell 82, the threaded rod 83 rotates to enable sand in the discharging hopper 81 to be transported upwards, people can conveniently feed materials, and the elastic cloth 85 is connected between the upper portion of the connecting shell 82 and the top of the feeding hopper 2.
When the device is needed, people pour a proper amount of gravel into the discharging hopper 81, then the motor 84 is started, the output shaft of the motor 84 rotates to drive the threaded rod 83 to rotate, the threaded rod 83 rotates to enable the gravel in the discharging hopper 81 to be transported upwards, the gravel in the discharging hopper 81 is transported into the feeding hopper 2 through the connecting shell 82 and the elastic cloth 85, people can conveniently carry out feeding work, and after the transportation is completed, the motor 84 is turned off.
It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the claims appended to the present application.
Claims (8)
1. The utility model provides a building grit sieving mechanism, a serial communication port, including play hopper (1), feeder hopper (2), screening mechanism (3), vibration mechanism (4) and clearance mechanism (5), be equipped with out hopper (1) and feeder hopper (2) on screening mechanism (3), feeder hopper (2) are located the top of a hopper (1), screening mechanism (3) bottom is provided with vibration mechanism (4) that are used for carrying out the vibration screening to the grit, vibration mechanism (4) right side is provided with and is used for scraping the clearance mechanism (5) that will glue the sand grain on the stone.
2. A building sandstone screening device according to claim 1, wherein the screening mechanism (3) comprises a discharge box (31), sieve plates (32) and baffles (33), the discharge box (1) and the feed box (2) are both installed at the rear side of the discharge box (31), the inner side of the discharge box (31) is uniformly connected with three sieve plates (32) at intervals, and the left part of the front side of the discharge box (31) is rotatably provided with three baffles (33) at uniform intervals.
3. The building sandstone screening device of claim 2, wherein the vibration mechanism (4) comprises a base (41), an elastic member (42), a vibrator (43) and a sliding frame (44), the sliding frame (44) is connected to the bottom of the emptying box (31), the base (41) is slidably arranged at the lower part of the sliding frame (44), the vibrator (43) is connected to the middle of the top of the base (41), the top of a telescopic rod of the vibrator (43) is connected with the sliding frame (44), and the elastic member (42) is symmetrically connected between the base (41) and the sliding frame (44).
4. A building sand screening device according to claim 3, wherein the cleaning mechanism (5) comprises a rack (51), a fixing plate (52), a brush (53) and a gear (54), the rack (51) is connected to the lower portion of one side of the base (41), the fixing plate (52) is connected to the right side of the upper portion of the emptying box (31), the brush (53) is rotatably arranged in the middle of the fixing plate (52), the brush (53) is located on the upper side inside the emptying box (31), the gear (54) is connected to the right side of the brush (53), and the gear (54) is meshed with the rack (51).
5. The building sand screening device according to claim 4, further comprising a dust removal mechanism (6) for removing dust inside the material placing box (31), wherein the dust removal mechanism (6) comprises a water tank (61), a pressing pump (62), a conveying pipe (63), a connecting block (64) and an atomizing nozzle (65), the water tank (61) is connected to the lower portion of one side, close to the rack (51), of the base (41), the pressing pump (62) is connected to and communicated with the rear side of the top of the water tank (61), a driving shaft of the pressing pump (62) is connected with the sliding frame (44), the conveying pipe (63) is connected to and communicated with the rear side of the pressing pump (62), the connecting block (64) is connected to the front side of the inner top of the material discharging hopper (1), the atomizing nozzle (65) is connected to the connecting block (64), and the upper end of the conveying pipe (63) is connected with and communicated with the atomizing nozzle (65).
6. The building sandstone screening device according to claim 5, further comprising a drying mechanism (7) for drying sandstone, wherein the drying mechanism (7) comprises a hot air blower (71), a connecting pipe (72) and a protective cover (73), the front part of one side of the base (41), which is far away from the rack (51), is connected with the hot air blower (71), the top of the hot air blower (71) is connected with the connecting pipe (72) and communicated with the connecting pipe (72), the upper end of the connecting pipe (72) penetrates through the left side of the discharge box (31), the upper end of the connecting pipe (72) is connected with the protective cover (73), and the protective cover (73) is located inside the discharge box (31).
7. The building sandstone screening device according to claim 6, further comprising a conveying mechanism (8) for feeding, wherein the conveying mechanism (8) comprises a discharge hopper (81), a connecting shell (82), a threaded rod (83), a motor (84) and elastic cloth (85), the discharge hopper (81) is connected to the rear portion of the left side of the base (41), the connecting shell (82) is connected to the discharge hopper (81), the motor (84) is connected to the left side of the upper portion of the connecting shell (82), the threaded rod (83) is connected to the bottom of an output shaft of the motor (84), the threaded rod (83) is located inside the connecting shell (82), and the elastic cloth (85) is connected between the upper portion of the connecting shell (82) and the top of the feed hopper (2).
8. A building sandstone screening device according to claim 1, wherein the discharge hopper (1) is inclined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211637631.5A CN115780244A (en) | 2022-12-20 | 2022-12-20 | Building grit sieving mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211637631.5A CN115780244A (en) | 2022-12-20 | 2022-12-20 | Building grit sieving mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115780244A true CN115780244A (en) | 2023-03-14 |
Family
ID=85426185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211637631.5A Pending CN115780244A (en) | 2022-12-20 | 2022-12-20 | Building grit sieving mechanism |
Country Status (1)
| Country | Link |
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| CN (1) | CN115780244A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116371719A (en) * | 2023-06-06 | 2023-07-04 | 四川磊蒙机械设备有限公司 | Sand and stone screening device |
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| CN217411456U (en) * | 2022-05-26 | 2022-09-13 | 北京三环建设有限公司 | Be used for building engineering grit screening installation |
| CN217664584U (en) * | 2022-06-07 | 2022-10-28 | 淮北砼友乐环保科技有限公司 | Sand and stone separator for concrete production |
| CN217797225U (en) * | 2022-07-13 | 2022-11-15 | 呼伦贝尔市农牧技术推广中心 | Soil fertilizer separator with grit screening function |
| CN217940871U (en) * | 2022-07-21 | 2022-12-02 | 仁化县振华建筑工程有限公司 | Grit sieving mechanism for housing construction |
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2022
- 2022-12-20 CN CN202211637631.5A patent/CN115780244A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210146440U (en) * | 2019-07-12 | 2020-03-17 | 杨刚 | Grit screening installation for building engineering |
| CN211070828U (en) * | 2019-12-02 | 2020-07-24 | 六盘水师范学院 | Grit screening plant for building engineering |
| CN215542695U (en) * | 2021-09-01 | 2022-01-18 | 广州顺盈混凝土有限公司 | Sand and stone separating equipment |
| CN114011699A (en) * | 2021-10-11 | 2022-02-08 | 田金梅 | Building site is with husky soil screening installation |
| CN217411456U (en) * | 2022-05-26 | 2022-09-13 | 北京三环建设有限公司 | Be used for building engineering grit screening installation |
| CN217664584U (en) * | 2022-06-07 | 2022-10-28 | 淮北砼友乐环保科技有限公司 | Sand and stone separator for concrete production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116371719A (en) * | 2023-06-06 | 2023-07-04 | 四川磊蒙机械设备有限公司 | Sand and stone screening device |
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