CN116499835A - Automatic sample pressing device of soil heavy metal instrument - Google Patents

Automatic sample pressing device of soil heavy metal instrument Download PDF

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Publication number
CN116499835A
CN116499835A CN202310723637.2A CN202310723637A CN116499835A CN 116499835 A CN116499835 A CN 116499835A CN 202310723637 A CN202310723637 A CN 202310723637A CN 116499835 A CN116499835 A CN 116499835A
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CN
China
Prior art keywords
fixedly connected
heavy metal
sample pressing
pressing device
rotating rod
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Granted
Application number
CN202310723637.2A
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Chinese (zh)
Other versions
CN116499835B (en
Inventor
桂毅
郭丽莉
郝弟
李书鹏
熊静
张冉
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BCEG Environmental Remediation Co Ltd
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BCEG Environmental Remediation Co Ltd
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Priority to CN202310723637.2A priority Critical patent/CN116499835B/en
Publication of CN116499835A publication Critical patent/CN116499835A/en
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Publication of CN116499835B publication Critical patent/CN116499835B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00Cleaning by methods involving the use of tools
    • B08B1/10Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/16Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
    • B08B1/165Scrapers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00Cleaning by methods involving the use of tools
    • B08B1/30Cleaning by methods involving the use of tools by movement of cleaning members over a surface

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention belongs to the technical field of automatic sample pressing devices, in particular to an automatic sample pressing device of a soil heavy metal instrument, aiming at the problems that in the prior art, when soil is pressed, soil is easy to be stained on a pressing plate, and when the pressing plate is contracted, the soil falls out of a sample barrel to cause waste. The invention has simple structure, can clean the soil bags stained by the pressing plate through the shaking mechanism and the scraping mechanism, avoids the condition of waste caused by falling out of the sample barrel, and is convenient for people to use.

Description

Automatic sample pressing device of soil heavy metal instrument
Technical Field
The invention relates to the technical field of automatic sample pressing devices, in particular to an automatic sample pressing device of a soil heavy metal instrument.
Background
Soil testing is a systematic measurement of various soil properties to check and record the spatio-temporal changes in these properties. The soil quality related data such as soil moisture content, nutrient content, pH value, pollution condition and the like of the soil can be obtained through soil detection, and the data obtained through the soil detection are critical to agricultural production and environmental management. At present, the specifications and the types of soil detection instruments are various, but samples to be detected of most instruments need to be manually involved in making pressed samples, so that on one hand, the pressure balance and the consistency of soil compactness cannot be ensured by manual operation, so that the prepared samples are uneven, and the detection result is inaccurate; on the other hand, a certain amount of manpower and material resources are consumed.
In the prior art, when pressing the appearance to soil, be infected with soil easily on the clamp plate, when contracting the clamp plate, lead to soil to drop outside the sample bucket, caused extravagant.
Disclosure of Invention
The invention aims to solve the defect that in the prior art, soil is easy to be stained on a pressing plate when the soil is pressed, and the soil falls out of a sample barrel to cause waste when the pressing plate is contracted.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an automatic sample pressing device of a soil heavy metal instrument comprises a base, a frame body is fixedly installed on the base, a top box is fixedly installed at the top of the frame body, a driving rod is fixedly connected to the top box, two gears are fixedly connected to the driving rod, two vertical racks are connected to the top box in a sliding mode, the two vertical racks are respectively meshed with the two gears, limiting plates are fixedly connected to the inner walls of the two sides of the top box in a sliding mode, one ends of the two limiting plates are fixedly connected with the two vertical racks respectively, a push plate is fixedly connected to the bottom ends of the two vertical racks, a shaking seat is fixedly installed at the bottom of the push plate, a partition plate is fixedly installed in the shaking seat, a vertical rotating rod is connected to the partition plate in a rotating mode, a polygonal block is fixedly connected to the bottom end of the vertical rotating rod, a shaking mechanism is arranged on the shaking seat, a sample pressing plate is fixedly connected to the bottom end of the vertical rotating rod, a scraping mechanism is symmetrically fixedly installed at the bottom of the sample pressing plate, a fixing seat is fixedly installed on the base, a sample fixing seat is fixedly connected to the sample barrel, the worm wheel fixing mechanism comprises two worm wheel fixing blocks, a first rotating rod and a second rotating rod is fixedly connected to the two inclined rotating rods, a first rotating rod is fixedly connected to one side of the first rotating rod and a second rotating rod is fixedly connected to the first rotating rod, and a first rotating rod is fixedly connected to the first rotating rod and a second rotating rod is fixedly connected to the first rotating rod, and a second rotating rod is fixedly connected to the second rotating rod, and a rotating rod is fixedly connected to the second rotating rod, and a rotating mechanism is fixedly connecting rod, and a rotating mechanism is fixedly connected to the rotating mechanism, and a rotating mechanism and a rotating device, and a rotating device is capable. The rotary rod can drive two eccentric wheels to rotate, and extrude two L template, shake the both sides of seat and all be equipped with shake spring, all fixedly connected with L template on two shake springs, two L template respectively with shake the both sides sliding connection of seat, the bottom of two L template respectively with press the template fixed connection, strike off the mechanism and include the second worm, second worm and perpendicular pivot fixed connection, press the inboard rotation of template to be connected with the bull stick, connect fixedly connected with second worm wheel on the bull stick, the second worm wheel meshes with the second worm mutually, connect two reciprocating screw of fixedly connected with on the bull stick, the equal sliding connection of reciprocating inslot of two reciprocating screw has the pin board, two pin boards all with press template sliding connection, the equal fixedly connected with of bottom of two pin boards scrapes the piece, fixed mounting has first motor on the baffle, the output shaft and the perpendicular bull stick fixed connection of first motor, one side fixed mounting of roof box has the second motor, the output shaft and the actuating lever fixed connection of second motor.
Compared with the prior art, the invention has the advantages that:
(1) According to the scheme, when the two shaking springs are arranged to release elasticity, the two L-shaped plates reset, the two L-shaped plates drive the template to shake up and down, so that the soil bags at the bottom of the template are fallen into the sample barrel, and the purpose of shaking off the soil bags is achieved.
(2) According to the scheme, the two pin plates are arranged to follow the reciprocating grooves of the two reciprocating screw rods to reciprocate, the two pin plates drive the two scraping blocks to reciprocate, and the soil bags at the bottom of the pressing sample plate are scraped in the sample barrel, so that the aim of cleaning the soil bags at the bottom of the pressing sample plate is fulfilled.
The invention has simple structure, can clean the soil bags stained by the pressing plate through the shaking mechanism and the scraping mechanism, avoids the condition of waste caused by falling out of the sample barrel, and is convenient for people to use.
Drawings
Fig. 1 is a schematic perspective view of an automatic sample pressing device of a soil heavy metal instrument according to the present invention;
fig. 2 is a schematic side view structure of an automatic sample pressing device of a soil heavy metal meter according to the present invention;
fig. 3 is a schematic diagram of a part a of an automatic sample pressing device of a soil heavy metal instrument according to the present invention;
fig. 4 is a schematic perspective view of an inclined plate of an automatic sample pressing device of a soil heavy metal instrument according to the present invention;
fig. 5 is a schematic perspective view of an L-shaped plate of an automatic sample pressing device of a soil heavy metal instrument according to the present invention.
In the figure: 1. a base; 2. a frame; 3. a top box; 4. a driving rod; 5. a gear; 6. a vertical rack; 7. a limiting plate; 8. a push plate; 9. a shaking seat; 10. a partition plate; 11. a vertical turning rod; 12. polygonal blocks; 13. a vertical rotating shaft; 14. pressing a sample plate; 15. a sloping plate; 16. a fixing seat; 17. a sample barrel; 18. a sloping block; 19. a fixed rod; 20. a fixed spring; 21. a fixing plate; 22. a first worm; 23. a rotating rod; 24. a first worm wheel; 25. an eccentric wheel; 26. an auxiliary plate; 27. a shaking spring; 28. an L-shaped plate; 29. a second worm; 30. connecting a rotating rod; 31. a second worm wheel; 32. a reciprocating screw rod; 33. a pin plate; 34. scraping blocks; 35. a first motor; 36. and a second motor.
Detailed Description
The technical solutions of the present embodiment will be clearly and completely described below with reference to the drawings in the present embodiment, and it is apparent that the described embodiments are only some embodiments of the present embodiment, not all embodiments.
Example 1
Referring to fig. 1-5, an automatic sample pressing device of a soil heavy metal instrument comprises a base 1, a frame body 2 is fixedly installed on the base 1, a top box 3 is fixedly installed at the top of the frame body 2, a driving rod 4 is rotationally connected to the top box 3, two gears 5 are fixedly connected to the driving rod 4, two vertical racks 6 are slidably connected to the top box 3, the two vertical racks 6 are respectively meshed with the two gears 5, limiting plates 7 are slidably connected to the inner walls of the two sides of the top box 3, one ends of the two limiting plates 7 are respectively fixedly connected with the two vertical racks 6, a push plate 8 is fixedly connected to the bottom ends of the two vertical racks 6, a shaking seat 9 is fixedly installed at the bottom of the push plate 8, a partition plate 10 is fixedly installed in the shaking seat 9, a vertical rotating rod 11 is rotationally connected to the partition plate 10, a polygonal block 12 is fixedly connected to the bottom end of the vertical rotating rod 11, a vertical rotating shaft 13 is sleeved with a vertical rotating shaft 13, sample pressing plates 14 are fixedly connected to the bottom of the polygonal block 12, a scraping plate 15 is symmetrically fixedly installed at the bottom of the sample pressing plate 14, a sample pressing mechanism 16 is fixedly installed on the sample pressing seat 1, a sample fixing seat 16 is fixedly installed on the base 16, and a fixing seat 16 is fixedly installed on the sample fixing seat 16.
In this embodiment, the fixing mechanism includes two inclined blocks 18, the two inclined blocks 18 are slidably connected with the base 1, one sides of the two inclined blocks 18 are fixedly connected with fixing rods 19, and the two fixing rods 19 are sleeved with fixing springs 20.
In this embodiment, one end of each of the two fixing rods 19 is fixedly connected with a fixing plate 21, and the two fixing plates 21 are matched.
In this embodiment, the shake mechanism includes a first worm 22, the first worm 22 is fixedly connected with the vertical rotating rod 11, a rotating rod 23 is rotationally connected to the shake base 9, a first worm wheel 24 is fixedly connected to the rotating rod 23, and the first worm wheel 24 is meshed with the first worm 22.
In this embodiment, both ends of the rotary rod 23 are fixedly connected with eccentric wheels 25, both sides of the shake base 9 are provided with shake springs 27, and the two shake springs 27 are fixedly connected with an L-shaped plate 28.
In this embodiment, two L-shaped plates 28 are slidably connected to two sides of the shaking seat 9, and bottom ends of the two L-shaped plates 28 are fixedly connected to the pressing plate 14.
In this embodiment, the scraping mechanism includes a second worm 29, the second worm 29 is fixedly connected with the vertical rotating shaft 13, a connecting rotating rod 30 is rotationally connected to the pressing plate 14, a second worm wheel 31 is fixedly connected to the connecting rotating rod 30, and the second worm wheel 31 is meshed with the second worm 29.
In this embodiment, two reciprocating screw rods 32 are fixedly connected to the connecting rotating rod 30, pin plates 33 are slidably connected to the reciprocating grooves of the two reciprocating screw rods 32, the two pin plates 33 are slidably connected to the sample pressing plate 14, and scraping blocks 34 are fixedly connected to the bottom ends of the two pin plates 33.
In this embodiment, a first motor 35 is fixedly mounted on the partition board 10, and an output shaft of the first motor 35 is fixedly connected with the vertical rotating rod 11.
In this embodiment, a second motor 36 is fixedly installed on one side of the top case 3, and an output shaft of the second motor 36 is fixedly connected with the driving rod 4.
In this embodiment, when the device is used, the soil bag is put into the sample barrel 17, the second motor 36 is started, the output shaft of the second motor 36 drives the driving rod 4 to rotate, the driving rod 4 drives the two gears 5 to rotate, the two gears 5 drive the two vertical racks 6 to move downwards, the two vertical racks 6 drive the push plate 8 to move downwards, the push plate 8 drives the two inclined plates 15 to move downwards, when the two inclined plates 15 are extruded with the two inclined blocks 18, the two inclined blocks 18 drive the two fixing rods 19 to approach each other and compress the two fixing springs 20, the two fixing rods 19 drive the two fixing plates 21 to approach each other and fix the sample barrel 17, meanwhile, the push plate 8 drives the pressing plate 14 to move downwards through the shaking seat 9 and press the soil bag into the sample barrel 17, after the pressing, the second motor 36 is reversely driven, so that the pressing plate 14 is positioned at the top opening of the sample barrel 17, starting the first motor 35, the output shaft of the first motor 35 drives the vertical rotating rod 11 to rotate, the vertical rotating rod 11 drives the first worm wheel 24 to rotate through the first worm 22, the first worm wheel 24 drives the rotating rod 23 to rotate, the rotating rod 23 drives the two eccentric wheels 25 to rotate and squeeze the two L-shaped plates 28, the two L-shaped plates 28 drive the two auxiliary plates 26 to move downwards and compress the two shaking springs 27, when the two shaking springs 27 release elasticity, the two L-shaped plates 28 reset, the two L-shaped plates 28 drive the pressing plate 14 to shake up and down, the soil bags at the bottom of the pressing plate 14 fall into the sample barrel 17, meanwhile, the vertical rotating rod 11 drives the vertical rotating shaft 13 to rotate through the polygonal block 12, the vertical rotating shaft 13 drives the second worm wheel 31 to rotate through the second worm wheel 29, the second worm wheel 31 drives the connecting rotating rod 30 to rotate, the connecting rotating rod 30 drives the two reciprocating screw rods 32 to rotate, simultaneously, the two pin plates 33 reciprocate along the reciprocating grooves of the two reciprocating screw rods 32, the two pin plates 33 drive the two scraping blocks 34 to reciprocate, and soil bags at the bottom of the pressing plate 14 are scraped in the sample barrel 17.
Example two
In this embodiment, the sample tank 17 is provided with an observation window, and the base 1 is provided with a controller.
The difference between this embodiment and the first embodiment is that: can watch sample bucket 17 inside condition through the observation window, can control first motor 35 and second motor 36 work through the controller, all structures in this application all can carry out the selection of material and length according to the actual use condition, and the drawing is the schematic structure diagram, and specific actual size can make suitable adjustment.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will be able to apply equally to the technical solution of the present invention and the inventive concept thereof, within the scope of the present invention.

Claims (10)

1. The utility model provides an automatic sample pressing device of soil heavy metal appearance, includes base (1), its characterized in that, fixed mounting has framework (2) on base (1), and the top fixed mounting of framework (2) has top case (3), and top case (3) internal rotation is connected with actuating lever (4), and fixedly connected with two gears (5) on actuating lever (4), sliding connection has two perpendicular racks (6) in top case (3), and two perpendicular racks (6) mesh with two gears (5) respectively, all sliding connection has limiting plate (7) on the both sides inner wall of top case (3), and the one end of two limiting plate (7) is respectively with two perpendicular racks (6) fixed connection, and the bottom fixedly connected with push pedal (8) of two perpendicular racks (6), and the bottom fixed mounting of push pedal (8) has shake seat (9), and fixedly connected with baffle (10) in the seat (9), and the internal rotation of baffle (10) has perpendicular bull stick (11), and bottom fixedly connected with perpendicular bull stick (12) of perpendicular bull stick (11), and equal sliding connection has limiting plate (7) on the both sides inner wall of top case (3), and the bottom of two perpendicular racks (7) is equipped with pivot (14) and shake the pivot (14) is equipped with on the pivot (14) and shake the pivot is equipped with the pivot (13), the pressure plate (14) is provided with a scraping mechanism, a fixing seat (16) is fixedly arranged on the base (1), a sample barrel (17) is fixedly arranged in the fixing seat (16), and a fixing mechanism is arranged on the fixing seat (16).
2. The automatic sample pressing device of the soil heavy metal instrument according to claim 1, wherein the fixing mechanism comprises two inclined blocks (18), the two inclined blocks (18) are both in sliding connection with the base (1), one sides of the two inclined blocks (18) are both fixedly connected with fixing rods (19), and the two fixing rods (19) are both sleeved with fixing springs (20).
3. The automatic sample pressing device of the soil heavy metal instrument according to claim 2, wherein one end of each of the two fixing rods (19) is fixedly connected with a fixing plate (21), and the two fixing plates (21) are matched.
4. The automatic sample pressing device of the soil heavy metal instrument according to claim 1, wherein the shaking mechanism comprises a first worm (22), the first worm (22) is fixedly connected with a vertical rotating rod (11), a rotating rod (23) is rotationally connected to the shaking seat (9), a first worm wheel (24) is fixedly connected to the rotating rod (23), and the first worm wheel (24) is meshed with the first worm (22).
5. The automatic sample pressing device of the soil heavy metal instrument according to claim 4, wherein two ends of the rotating rod (23) are fixedly connected with eccentric wheels (25), two sides of the shaking seat (9) are provided with shaking springs (27), and two shaking springs (27) are fixedly connected with L-shaped plates (28).
6. The automatic sample pressing device of the soil heavy metal instrument according to claim 5, wherein two L-shaped plates (28) are respectively and slidably connected with two sides of the shaking seat (9), and the bottom ends of the two L-shaped plates (28) are respectively and fixedly connected with the sample pressing plate (14).
7. The automatic sample pressing device of the soil heavy metal instrument according to claim 1, wherein the scraping mechanism comprises a second worm (29), the second worm (29) is fixedly connected with the vertical rotating shaft (13), the sample pressing plate (14) is rotatably connected with a connecting rotating rod (30), the connecting rotating rod (30) is fixedly connected with a second worm wheel (31), and the second worm wheel (31) is meshed with the second worm (29).
8. The automatic sample pressing device of the soil heavy metal instrument according to claim 7, wherein two reciprocating screw rods (32) are fixedly connected to the connecting rotating rod (30), pin plates (33) are slidably connected to the reciprocating grooves of the two reciprocating screw rods (32), the two pin plates (33) are slidably connected with the sample pressing plate (14), and scraping blocks (34) are fixedly connected to the bottom ends of the two pin plates (33).
9. The automatic sample pressing device of the soil heavy metal instrument according to claim 1, wherein a first motor (35) is fixedly installed on the partition board (10), and an output shaft of the first motor (35) is fixedly connected with the vertical rotating rod (11).
10. The automatic sample pressing device of the soil heavy metal instrument according to claim 1, wherein a second motor (36) is fixedly arranged on one side of the top box (3), and an output shaft of the second motor (36) is fixedly connected with the driving rod (4).
CN202310723637.2A 2023-06-19 2023-06-19 Automatic sample pressing device of soil heavy metal instrument Active CN116499835B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310723637.2A CN116499835B (en) 2023-06-19 2023-06-19 Automatic sample pressing device of soil heavy metal instrument

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Application Number Priority Date Filing Date Title
CN202310723637.2A CN116499835B (en) 2023-06-19 2023-06-19 Automatic sample pressing device of soil heavy metal instrument

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CN116499835B CN116499835B (en) 2023-09-01

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Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120136767A (en) * 2011-06-10 2012-12-20 이호석 Multipurpose auger
CN107824256A (en) * 2017-10-19 2018-03-23 长沙市凤英机械科技有限公司 A kind of vibrating type mineral products refinement mineral breaker
CN108811540A (en) * 2018-07-04 2018-11-16 邱文斌 Clay land presser is removed in the novel included cleaning of one kind
CN210730404U (en) * 2019-09-11 2020-06-12 周永军 Soil shaking machine for liquorice roots and rhizomes
CN112546703A (en) * 2020-12-02 2021-03-26 孔姗姗 Kitchen sewage treatment equipment
CN212903976U (en) * 2020-08-25 2021-04-06 四川赛纳斯分析检测有限公司 Environmental soil collection system
CN112958279A (en) * 2021-01-28 2021-06-15 李启辉 Sample crushing and screening device for soil detection
CN113007272A (en) * 2021-02-09 2021-06-22 蒋丽 High-efficient environmental protection heat pump
CN113022740A (en) * 2021-04-02 2021-06-25 无锡集萃绿色信息科技有限公司 Unmanned detection vehicle for collecting soil samples in field
CN213914837U (en) * 2020-11-22 2021-08-10 承德县宝旺商品混凝土有限公司 Multistage screening equipment is used in recycled concrete processing
CN114563346A (en) * 2022-04-28 2022-05-31 南京庆瑞水泥有限公司 Cement bonding strength detection device
WO2022116573A1 (en) * 2020-12-02 2022-06-09 广州城市理工学院 Outward-expanding fastening type gravitational anti-bumping vehicle-mounted mobile phone support
CN115245068A (en) * 2022-08-29 2022-10-28 山东科达环境工程有限公司 Ramming equipment is backfilled to environmental engineering soil
CN115430668A (en) * 2022-08-26 2022-12-06 熊新党 Biomass energy raw material processing equipment

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120136767A (en) * 2011-06-10 2012-12-20 이호석 Multipurpose auger
CN107824256A (en) * 2017-10-19 2018-03-23 长沙市凤英机械科技有限公司 A kind of vibrating type mineral products refinement mineral breaker
CN108811540A (en) * 2018-07-04 2018-11-16 邱文斌 Clay land presser is removed in the novel included cleaning of one kind
CN210730404U (en) * 2019-09-11 2020-06-12 周永军 Soil shaking machine for liquorice roots and rhizomes
CN212903976U (en) * 2020-08-25 2021-04-06 四川赛纳斯分析检测有限公司 Environmental soil collection system
CN213914837U (en) * 2020-11-22 2021-08-10 承德县宝旺商品混凝土有限公司 Multistage screening equipment is used in recycled concrete processing
CN112546703A (en) * 2020-12-02 2021-03-26 孔姗姗 Kitchen sewage treatment equipment
WO2022116573A1 (en) * 2020-12-02 2022-06-09 广州城市理工学院 Outward-expanding fastening type gravitational anti-bumping vehicle-mounted mobile phone support
CN112958279A (en) * 2021-01-28 2021-06-15 李启辉 Sample crushing and screening device for soil detection
CN113007272A (en) * 2021-02-09 2021-06-22 蒋丽 High-efficient environmental protection heat pump
CN113022740A (en) * 2021-04-02 2021-06-25 无锡集萃绿色信息科技有限公司 Unmanned detection vehicle for collecting soil samples in field
CN114563346A (en) * 2022-04-28 2022-05-31 南京庆瑞水泥有限公司 Cement bonding strength detection device
CN115430668A (en) * 2022-08-26 2022-12-06 熊新党 Biomass energy raw material processing equipment
CN115245068A (en) * 2022-08-29 2022-10-28 山东科达环境工程有限公司 Ramming equipment is backfilled to environmental engineering soil

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