CN210834250U - Geotechnical engineering investigation auxiliary device - Google Patents
Geotechnical engineering investigation auxiliary device Download PDFInfo
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- CN210834250U CN210834250U CN201921566933.1U CN201921566933U CN210834250U CN 210834250 U CN210834250 U CN 210834250U CN 201921566933 U CN201921566933 U CN 201921566933U CN 210834250 U CN210834250 U CN 210834250U
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- fixed cylinder
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- geotechnical engineering
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- 238000011835 investigation Methods 0.000 title claims abstract description 11
- 239000007787 solid Substances 0.000 claims description 41
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 21
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 21
- 241001330002 Bambuseae Species 0.000 claims description 21
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 21
- 239000011425 bamboo Substances 0.000 claims description 21
- 238000005070 sampling Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002349 favourable effect Effects 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- -1 stratum structures Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a geological survey technical field to the lower problem of geotechnical engineering reconnaissance device stability, provides a geotechnical engineering reconnaissance auxiliary device, and this technical scheme is as follows: an geotechnical engineering investigation auxiliary device comprises a driving motor, wherein the driving motor is fixedly connected with a handle, the driving motor is rotatably connected with a rotating shaft, one end of the rotating shaft is fixedly connected with a sampling rod, a sampling port is formed in the sampling rod, one end of the sampling rod is fixedly connected with a drill bit, a fixing cylinder is sleeved outside the driving motor, a guide hole is formed in the fixing cylinder, the handle is slidably connected with the guide hole, one end, facing the ground, of the fixing cylinder is open, a fixing hole is formed in the fixing cylinder, and the fixing hole is slidably connected with a fixing rod; because of the guiding effect of guiding hole for the drill bit is difficult for taking place the skew when downstream, and the drill bit keeps vertical state always, and then makes the drill bit be difficult for because of the uneven fracture of atress, and device stability is higher.
Description
Technical Field
The utility model belongs to the technical field of the geological survey technique and specifically relates to a geotechnical engineering reconnaissance auxiliary device is related to.
Background
Geological survey is a short term for geological survey work. Generally, the term is understood as a synonym of geological work, and different investigation and research works are carried out on geological conditions such as rocks, stratum structures, minerals, underground water, landforms and the like in a certain area according to the needs of economic construction, national defense construction and scientific and technical development.
Along with the development of times and science and technology, present geotechnical engineering reconnaissance device adopts the sample rig to drill the sample mostly, present sample rig mainly includes driving motor, with driving motor fixed connection's handle, rotate the pivot of being connected with driving motor, pivot fixedly connected with thief rod, it has the sample connection to open on the thief rod, the one end fixedly connected with drill bit of pivot is kept away from to the thief rod, driving motor drive pivot rotates during the sample, the pivot drives the drill bit and carries out vertical decurrent motion, the sample connection is collected the geology, and then accomplish the sample work.
The staff only comes controlling means's straightness that hangs down through controlling the handle with the hand in the sample process for the stability of device is lower, and at the in-process of probing, the device is difficult to keep always in vertical state, and then makes the drill bit easily because of the uneven fracture of atress, influences drilling sample job schedule, consequently, needs improve.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a geotechnical engineering reconnaissance auxiliary device has stability higher, the difficult cracked advantage of drill bit.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model provides a geotechnical engineering reconnaissance auxiliary device, includes driving motor, driving motor fixedly connected with handle, driving motor's one end fixedly connected with thief rod is kept away from to last pivot of driving motor, it has the sample connection to open on the thief rod, the one end fixedly connected with drill bit of pivot is kept away from to the thief rod, driving motor has cup jointed the solid fixed cylinder outward, pivot, thief rod, drill bit all are located the solid fixed cylinder, open the guiding hole that has vertical setting on the solid fixed cylinder, handle and guiding hole sliding connection, solid fixed cylinder one end opening, the drill bit is located the solid fixed cylinder open end, it has the fixed orifices to open on the solid fixed cylinder, the fixed orifices distributes along the solid fixed cylinder circumference has at least two, the fixed orifices sliding connection has the dead lever, the dead lever cooperates with ground grafting.
By adopting the technical scheme, when a worker samples and observes the geology, the fixed rod is inserted into the ground, the fixed cylinder is enabled to be kept in a state vertical to the ground, the driving motor is started, the driving motor drives the rotating shaft to rotate, the rotating shaft drives the sampling rod to rotate, the sampling rod drives the drill bit to rotate, force is applied to the handle, the handle vertically and downwards moves along the guide hole, the drill bit vertically and downwards moves, the drill bit is not prone to being deviated when moving downwards due to the guiding effect of the guide hole, the drill bit is always kept in a vertical state, the drill bit is not prone to being broken due to uneven stress, and the device stability is high; meanwhile, due to the arrangement of the fixed cylinder, when the drill bit drills the ground, dust is not easy to splash onto the body of a worker, and the body of the worker is not easy to adhere to the dust; driving motor, pivot, thief rod, drill bit all are located the solid fixed cylinder for the difficult device that collides with the solid fixed cylinder of external object, are favorable to prolonging the life of solid fixed cylinder device.
The fixed cylinder comprises an upper fixed cylinder and a lower fixed cylinder which is connected with the upper fixed cylinder in a sliding mode, the upper fixed cylinder is provided with a connecting hole, the lower fixed cylinder is provided with an adjusting hole, the adjusting hole is distributed in a plurality of positions along the vertical direction, the connecting hole and the adjusting hole are located on the same vertical line, the connecting hole is in threaded connection with an adjusting bolt, and the adjusting bolt penetrates through the connecting hole and is in threaded connection with the adjusting hole.
Through adopting above-mentioned technical scheme, because of the mating reaction of connecting hole and regulation hole for the height of solid fixed cylinder can be adjusted, and then makes solid fixed cylinder can adapt to the sample rod and the drill bit of different length, is favorable to strengthening the adaptability of solid fixed cylinder.
The utility model discloses further set up to: and a plurality of groups of connecting holes and adjusting holes are distributed along the circumference of the fixed cylinder.
Through adopting above-mentioned technical scheme, because of the cooperation of multiunit connecting hole and regulation hole for go up the solid fixed cylinder after the altitude mixture control of solid fixed cylinder and be connected more firm with solid fixed cylinder down, gu fixed cylinder can be more stable fix on ground, the drill bit is difficult for the skew when boring ground, is favorable to strengthening the stability of device.
The utility model discloses further set up to: go up a fixed section of thick bamboo including a left fixed section of thick bamboo, with a fixed section of thick bamboo articulated right fixed section of thick bamboo of a left side, a fixed section of thick bamboo threaded connection in a left side has connecting bolt, connecting bolt runs through a fixed section of thick bamboo in a left side and a fixed section of thick bamboo threaded connection in a right side, a fixed section of thick bamboo is opened has the movable orifice that the level set up, movable orifice and handle sliding connection, movable orifice and guiding hole intercommunication.
By adopting the technical scheme, the fixed cylinder can be opened, the upper fixed cylinder is arranged into the left fixed cylinder and the right fixed cylinder which are opened and closed, and the driving motor, the rotating shaft, the sampling rod and the drill bit can be taken out of the fixed cylinder, so that the device in the fixed cylinder can be conveniently overhauled and maintained; because of connecting bolt's setting for left fixed cylinder links together with right fixed cylinder, takes off connecting bolt and just can make fixed cylinder fall into two parts, and then makes opening of fixed cylinder convenient.
The utility model discloses further set up to: at least two connecting bolts are distributed along the height direction of the fixed cylinder.
Through adopting above-mentioned technical scheme, because of connecting bolt has two settings at least for left fixed cylinder is more firm when fixed with right fixed cylinder, and left fixed cylinder is difficult for separating with right fixed cylinder, and then makes the drill bit difficult skew at the during operation, is favorable to strengthening the stability of device.
The utility model discloses further set up to: at least three connecting bolts are uniformly distributed along the height direction of the fixed cylinder.
Through adopting above-mentioned technical scheme, because of connecting bolt along the setting of solid fixed cylinder direction of height evenly distributed for the locking force that connecting bolt bore is more even, is favorable to left solid fixed cylinder and solid fixed cylinder to have better locking effect.
The utility model discloses further set up to: the lower fixing cylinder comprises a convex block integrally connected with the fixing cylinder, the convex block is arranged close to the opening end of the fixing cylinder, and the fixing hole is formed in the convex block.
Through adopting above-mentioned technical scheme, because of the setting of lug for the area of fixed cylinder and ground contact is bigger, and the lug has disperseed the pressure of fixed cylinder to ground, makes fixed cylinder more firm when ground is fixed, is favorable to strengthening the stability of device.
The utility model discloses further set up to: one end of the fixing rod, which is far away from the fixing barrel, is of a pointed structure.
Through adopting above-mentioned technical scheme, because of the dead lever is kept away from fixed section of thick bamboo one end and is most advanced setting for when the dead lever inserts ground, the dead lever has bigger pressure to ground, and then makes things convenient for the dead lever to insert ground more.
To sum up, the utility model discloses following beneficial effect has:
1. due to the guiding effect of the guide hole, the drill bit is not easy to deviate when moving downwards, the drill bit is always kept in a vertical state, the drill bit is further not easy to break due to uneven stress, and the stability of the device is high;
2. due to the matching effect of the connecting hole and the adjusting hole, the height of the fixed cylinder can be adjusted, so that the fixed cylinder can adapt to sampling rods and drill bits with different lengths, and the adaptability of the fixed cylinder is enhanced;
3. because the end of the fixing rod, which is far away from the fixing cylinder, is the pointed end, when the fixing rod is inserted into the ground, the fixing rod has higher pressure on the ground, and the fixing rod is more conveniently inserted into the ground.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the left and right fixed cylinders of the present invention when they are opened;
FIG. 3 is a schematic view of the upper and lower fixed cylinders of the present invention when they are separated;
fig. 4 is an enlarged schematic view of a in fig. 3.
In the figure: 1. a drive motor; 2. a handle; 3. a rotating shaft; 4. a sampling rod; 5. a sampling port; 6. a drill bit; 7. a fixed cylinder; 71. an upper fixed cylinder; 72. a lower fixed cylinder; 711. a left fixed cylinder; 712. a right fixed cylinder; 8. A guide hole; 9. a fixing hole; 10. fixing the rod; 11. connecting holes; 12. an adjustment hole; 13. adjusting the bolt; 14. a connecting bolt; 15. a movable hole; 16. a connecting nut; 17. a first fixing plate; 18. a second fixing plate; 19. a bump; 20. and (4) strip-shaped holes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1 and 2, a geotechnical engineering reconnaissance auxiliary device, including a fixed section of thick bamboo 7, driving motor 1 has been placed in a fixed section of thick bamboo 7, 3 fixedly connected with thief rod 4 of the last pivot of driving motor 1, it has sample connection 5 to open on thief rod 4, the one end fixedly connected with drill bit 6 of pivot 3 is kept away from to thief rod 4, it has the guiding hole 8 of vertical setting to open on a fixed section of thick bamboo 7, 8 sliding connection in guiding hole have handle 2, handle 2 and driving motor 1 fixed connection, a fixed section of thick bamboo 7 is close to the one end opening on ground, it has fixed orifices 9 to open on a fixed section of thick bamboo 7, fixed orifices 9 distributes along a fixed section of thick bamboo 7 circumference has threely, fixed.
The fixed cylinder 7 is provided with a movable hole 15 which is horizontally arranged, the movable hole 15 is connected with the handle 2 in a sliding way, and the movable hole 15 is communicated with the guide hole 8.
The cross section of the fixed cylinder 7 is circular, one end of the fixed cylinder 7, which is far away from the ground, is closed, the fixed cylinder 7 comprises an upper fixed cylinder 71 and a lower fixed cylinder 72, and the upper fixed cylinder 71 is in sliding connection with the lower fixed cylinder 72.
The upper fixed cylinder 71 comprises a left fixed cylinder 711 and a right fixed cylinder 712, the left fixed cylinder 711 is hinged with the right fixed cylinder 712, and the left fixed cylinder 711 and the right fixed cylinder 712 are consistent in size.
The cross section of the handle 2 is circular, two handles 2 are symmetrically arranged about the symmetrical axis of the fixed cylinder 7, and anti-skid grains are carved on the handle 2.
The cross section of the fixing rod 10 is circular, the diameter of one end, far away from the ground, of the fixing rod 10 is larger than the aperture of the fixing hole 9, and the end, far away from the fixing barrel 7, of the fixing rod 10 is arranged in a pointed end mode.
Referring to fig. 3, the upper fixed cylinder 71 is sleeved on the lower fixed cylinder 72, the thickness of the sliding connection part between the lower fixed cylinder 72 and the upper fixed cylinder 71 is smaller than the thickness of the non-sliding connection part between the lower fixed cylinder 72 and the upper fixed cylinder 71, the lower fixed cylinder 72 is provided with a strip-shaped hole 20 with the same width as the guide hole 8, one end of the strip-shaped hole 20 facing the upper fixed cylinder 71 is open, and the strip-shaped hole 20 and the guide hole 8 are located on the same vertical line and partially overlapped.
The lower fixing cylinder 72 is integrally formed with a bump 19, the bump 19 is arranged near the opening end of the fixing cylinder 7, the cross section of the bump 19 is rectangular, three bumps 19 are distributed along the circumference of the fixing cylinder 7, and the fixing holes 9 are located on the bump 19.
The upper fixing cylinder 71 is provided with connecting holes 11, the lower fixing cylinder 72 is provided with adjusting holes 12, the adjusting holes 12 are uniformly distributed in five along the vertical direction, the connecting holes 11 and the adjusting holes 12 are positioned on the same vertical line, the connecting holes 11 and the adjusting holes 12 are uniformly distributed in four groups along the circumference of the fixing cylinder 7, the connecting holes 11 are in threaded connection with adjusting bolts 13, and the adjusting bolts 13 extend into the fixing cylinder 7 and are in threaded connection with the adjusting holes 12.
Referring to fig. 3 and 4, a first fixing plate 17 is integrally formed on one side of the left fixing cylinder 711 away from the hinge point, a second fixing plate 18 is integrally formed on one side of the right fixing cylinder 712 away from the hinge point, the first fixing plate 17 and the second fixing plate 18 are identical in size and rectangular in cross section, a connecting bolt 14 penetrates through the first fixing plate 17, the connecting bolt 14 is in threaded connection with the second fixing plate 18, the connecting bolt 14 penetrates through the second fixing plate 18 and is in threaded connection with a connecting nut 16, the connecting nut 16 tightly supports the second fixing plate 18, and three connecting bolts 14 are uniformly distributed along the height direction of the upper fixing cylinder 71.
The working conditions and principles of the embodiment are as follows:
when a worker carries out geological exploration work, firstly, pressure is applied to the fixing rod 10, the fixing rod 10 is inserted into the ground, and due to the fact that one end of the fixing rod 10 is the pointed end, the pressure born by the ground is larger, and the fixing rod 10 is more easily inserted into the ground; after the fixed rod 10 is inserted into the ground, the fixed cylinder 7 is fixed on the ground, the driving motor 1 is started, the rotating shaft 3 is rotated, the drill bit 6 drills into the ground, the geology is sampled through the sampling port 5 on the sampling rod 4, when the drill bit 6 moves downwards, the handle 2 vertically slides downwards along the guide hole 8 due to the guiding effect of the guide hole 8, the drill bit 6 is always in a vertical state, so that the drill bit 6 is not easy to deviate when drilling into the ground, the drill bit 6 is not easy to break due to uneven stress, and the service life of the drill bit 6 is prolonged; the fixed cylinder 7 ensures that the device in the fixed cylinder 7 is not easy to collide with the outside to cause damage, thereby being beneficial to prolonging the service life of the device in the fixed cylinder 7; meanwhile, dust splashed by the drill bit 6 during working is not easy to be splashed out of the fixed cylinder 7, and the working environment of workers is improved.
When the device in the fixed cylinder 7 needs to be overhauled, the connecting bolt 14 is screwed off, so that the left fixed cylinder 711 and the right fixed cylinder 712 can be opened, the device in the fixed cylinder 7 is taken out, and the device placed in the fixed cylinder 7 can be overhauled; due to the arrangement of the connecting bolt 14, the relative positions of the left fixing cylinder 711 and the right fixing cylinder 712 are fixed, which is beneficial to enhancing the stability of the device; meanwhile, the left fixed cylinder 711 and the right fixed cylinder 712 are no longer fixed relatively by unscrewing the connecting bolt 14, so that the device is convenient to disassemble.
Because the connecting bolts 14 are distributed along the vertical direction, when the left fixing cylinder 711 and the right fixing cylinder 712 are fixed in relative positions, the left fixing cylinder 711 and the right fixing cylinder 712 are fixed more stably, which is beneficial to further enhancing the stability of the device.
When facing to the drill bit 6 or the thief rod 4 of different length, unscrew adjusting bolt 13, go up solid fixed cylinder 71 along solid fixed cylinder 72 moves up down or move down just can make the highly increase or the reduction of solid fixed cylinder 7, the height of solid fixed cylinder 7 can be adjusted for solid fixed cylinder 7 can adapt to the drill bit 6 or the thief rod 4 of different length, and then is favorable to strengthening the adaptability of solid fixed cylinder 7.
Because of adjusting bolt 13 has four around solid fixed cylinder 7 evenly distributed for when going up solid fixed cylinder 71 and solid fixed cylinder 72 relative position down fixed cylinder, go up solid fixed cylinder 71 and be connected more stable with solid fixed cylinder 72 down, and then make solid fixed more firm of solid fixed cylinder 7, be favorable to further reinforcing device's stability.
Because of the one end that solid fixed cylinder 7 kept away from ground is sealed for solid fixed cylinder 7 has better closed effect to solid fixed cylinder 7 in-device, and then makes solid fixed cylinder 7 have better guard action.
Due to the arrangement of the projection 19, the contact area of the lower fixing cylinder 72 and the ground is larger, and the fixing of the fixing cylinder 7 on the ground is more stable.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. The utility model provides a geotechnical engineering reconnaissance auxiliary device, includes driving motor (1), driving motor (1) fixedly connected with handle (2), pivot (3) fixedly connected with thief rod (4) on driving motor (1), it has sample connection (5) to open on thief rod (4), one end fixedly connected with drill bit (6), characterized by of pivot (3) are kept away from in thief rod (4): driving motor (1) has cup jointed solid fixed cylinder (7) outward, pivot (3), thief rod (4), drill bit (6) all are located solid fixed cylinder (7), open guiding hole (8) that have vertical setting on solid fixed cylinder (7), handle (2) and guiding hole (8) sliding connection, gu fixed cylinder (7) one end opening, drill bit (6) are located solid fixed cylinder (7) open end, gu fixed cylinder (7) are gone up to open has fixed orifices (9), fixed orifices (9) have two at least along solid fixed cylinder (7) circumference distribution, fixed orifices (9) sliding connection has dead lever (10), dead lever (10) are pegged graft with ground and are cooperated.
2. The geotechnical engineering investigation auxiliary device according to claim 1, wherein: fixed section of thick bamboo (7) including last fixed section of thick bamboo (71), with last fixed section of thick bamboo (71) sliding connection's lower fixed section of thick bamboo (72), it has connecting hole (11) to go up fixed section of thick bamboo (71) and open, down fixed section of thick bamboo (72) are opened and are had regulation hole (12), regulation hole (12) distribute along vertical direction has a plurality ofly, connecting hole (11) are located same vertical line with regulation hole (12), connecting hole (11) threaded connection has adjusting bolt (13), adjusting bolt (13) pass connecting hole (11) and with regulation hole (12) threaded connection.
3. The geotechnical engineering investigation auxiliary device according to claim 2, wherein: and a plurality of groups of connecting holes (11) and adjusting holes (12) are distributed along the circumferential direction of the fixed cylinder (7).
4. The geotechnical engineering investigation auxiliary device according to claim 2, wherein: go up fixed cylinder (71) including left fixed cylinder (711), with left fixed cylinder (711) articulated right fixed cylinder (712), left fixed cylinder (711) threaded connection has connecting bolt (14), connecting bolt (14) run through left fixed cylinder (711) and with right fixed cylinder (712) threaded connection, fixed cylinder (7) are opened movable hole (15) that have the level to set up, movable hole (15) and handle (2) sliding connection, movable hole (15) and guiding hole (8) intercommunication.
5. The geotechnical engineering investigation auxiliary device according to claim 4, wherein: at least two connecting bolts (14) are distributed along the height direction of the upper fixing cylinder (71).
6. The geotechnical engineering investigation auxiliary device according to claim 5, wherein: at least three connecting bolts (14) are uniformly distributed along the height direction of the upper fixing cylinder (71).
7. The geotechnical engineering investigation auxiliary device according to claim 2, wherein: the fixed cylinder (7) comprises a lug (19) integrally connected with the lower fixed cylinder (72), the lug (19) is arranged close to the opening end of the fixed cylinder (7), and the fixing hole (9) is formed in the lug (19).
8. The geotechnical engineering investigation auxiliary device according to claim 1, wherein: one end of the fixing rod (10) far away from the fixing barrel (7) is of a pointed structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921566933.1U CN210834250U (en) | 2019-09-19 | 2019-09-19 | Geotechnical engineering investigation auxiliary device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921566933.1U CN210834250U (en) | 2019-09-19 | 2019-09-19 | Geotechnical engineering investigation auxiliary device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210834250U true CN210834250U (en) | 2020-06-23 |
Family
ID=71251990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921566933.1U Expired - Fee Related CN210834250U (en) | 2019-09-19 | 2019-09-19 | Geotechnical engineering investigation auxiliary device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210834250U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067343A (en) * | 2020-08-17 | 2020-12-11 | 四川轻化工大学 | Sampling device for geotechnical engineering investigation and using method thereof |
-
2019
- 2019-09-19 CN CN201921566933.1U patent/CN210834250U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067343A (en) * | 2020-08-17 | 2020-12-11 | 四川轻化工大学 | Sampling device for geotechnical engineering investigation and using method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200623 |