CN115556056A - Bottom inclination angle simulation core sample holder - Google Patents
Bottom inclination angle simulation core sample holder Download PDFInfo
- Publication number
- CN115556056A CN115556056A CN202211025934.1A CN202211025934A CN115556056A CN 115556056 A CN115556056 A CN 115556056A CN 202211025934 A CN202211025934 A CN 202211025934A CN 115556056 A CN115556056 A CN 115556056A
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- Prior art keywords
- holder
- piston
- leg
- barrel
- supporting leg
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- 238000004088 simulation Methods 0.000 title claims abstract description 12
- 238000013016 damping Methods 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 7
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 6
- 229920002530 polyetherether ketone Polymers 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 3
- 239000003351 stiffener Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
- B25H1/14—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby with provision for adjusting the bench top
- B25H1/18—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby with provision for adjusting the bench top in inclination
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
- B25H1/06—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby of trestle type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pulmonology (AREA)
- Radiology & Medical Imaging (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (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 discloses a bottom inclination angle simulation core sample holder, which relates to the technical field of oil and gas development and comprises a holder cylinder, an adjusting support and an angle indicating disc, wherein the adjusting support is arranged at the center of the outer side of the holder cylinder, the adjusting support is rotationally connected with the holder cylinder, the angle indicating disc is arranged at the center of the adjusting support, a pointer of the angle indicating disc is in driving connection with the holder cylinder, the bottom end of the adjusting support is provided with a universal supporting leg, the adjusting support comprises a first supporting leg, a second supporting leg, a third supporting leg and a fourth supporting leg, the first supporting leg and the second supporting leg are arranged on one side of the holder cylinder, the first supporting leg and the second supporting leg are rotationally connected, the third supporting leg and the fourth supporting leg are arranged on the other side of the holder cylinder, and the third supporting leg and the fourth supporting leg are rotationally connected.
Description
Technical Field
The invention belongs to the technical field of oil and gas development, and particularly relates to a bottom-layer inclination angle simulation core sample holder.
Background
The core is a cylindrical rock sample taken out of the hole by using an annular core drill and other coring tools according to the requirements of geological exploration work or engineering. The core is an important physical geological data for researching and understanding underground geology and mineral conditions.
When an indoor physical simulation oil displacement experiment is carried out, all parameters of a target oil reservoir, such as porosity, permeability, specific surface area, oil layer inclination angle and the like, are simulated, and the porosity, the permeability, the specific surface area and the like can be realized through a core manufacturing process. Stratum inclination angles of oil reservoir blocks with different purposes are different, field conditions need to be simulated as much as possible when indoor physical simulation oil displacement experiments are carried out, and the existing rock core holder does not have the function of simulating the stratum inclination angle.
Therefore, how to arrange a core sample holder with a simulated formation inclination angle to obtain a more real simulation result becomes a problem to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above, the invention provides a core sample holder capable of simulating the inclination angle of the bottom layer, which can simulate the formation inclination angle of a target oil reservoir oil layer, is convenient to fold, disassemble and assemble, facilitates the transportation of the core sample holder, and improves the working efficiency of workers.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a bottom inclination simulation rock core sample holder, includes the holder barrel, adjusts support and angle indicator panel, adjust the center that the support set up in the outside of holding body barrel, it is connected with the rotation of holder barrel to adjust the support, the angle indicator panel sets up the center at adjusting the support, the pointer and the drive of holder barrel of angle indicator panel are connected, the bottom of adjusting the support is provided with universal stabilizer blade, it includes first landing leg, second landing leg, third landing leg and fourth landing leg to adjust the support, first landing leg and second landing leg setting are in one side of holder barrel, first landing leg and second landing leg rotate to be connected, third landing leg and fourth landing leg setting are at the opposite side of holder barrel, third landing leg and fourth landing leg rotate to be connected.
The clamp holder further comprises damping hinges symmetrically arranged at the center of the side face of the clamp holder barrel, the first supporting leg and the second supporting leg are rotatably connected through the damping hinges, and the third supporting leg and the fourth supporting leg are rotatably connected through the damping hinges.
Furthermore, a confining pressure air inlet is formed in the center of the damping hinge.
Furthermore, the holder cylinder is made of polyether-ether-ketone or polyether-ether-ketone carbon fiber materials.
Further, both ends are provided with left end cap and right end cap about the holder barrel, the holder barrel respectively with left end cap, right end cap threaded connection, install on the end cap of the right side and impel the support, inside support frame, rubber barrel, first piston and the second piston of having set gradually of holder barrel, first piston and second piston set up the both ends at rubber barrel respectively, first piston and second piston and rubber barrel sliding connection, second piston and left end cap butt, the one end of first piston is provided with the regulation pole, the surface of adjusting the pole is provided with the external screw thread, install pressure sensor on the regulation pole, the other end of adjusting the pole runs through right end cap and with right end cap threaded connection, adjust pole and impel support threaded connection, the top of adjusting the pole is installed and is impeld the carousel.
Furthermore, first piston, second piston, left end cap and right end cap are hollow structure, the outside of left end cap is provided with the leakage fluid dram, adjust the pole and be hollow structure, the one end of adjusting the pole is linked together with the piston, the other end of adjusting the pole is provided with rotary joint.
Furthermore, a sealing gasket is arranged at the joint of the first piston and the adjusting rod.
The clamp is characterized by further comprising a spiral flow guide cavity, wherein the spiral flow guide cavity is arranged in the cylinder wall of the clamp barrel, an air inlet is formed in one end of the outer wall of the clamp barrel, and an air outlet is formed in the other end of the outer wall of the clamp barrel.
Furthermore, the reinforcing rod is rotatably arranged in the first supporting leg and the third supporting leg, one end of the reinforcing rod is rotatably connected with the first supporting leg and the third supporting leg, the other end of the reinforcing rod is inserted into the first supporting leg and the third supporting leg through a bolt, and the second supporting leg and the fourth supporting leg are correspondingly provided with inserting holes.
The beneficial effects of the invention are as follows:
the adjustable-angle adjusting support is adopted, the adjustable-angle adjusting support is simple to install and convenient to take and store the holder barrel, the damping hinge can ensure that the adjusting support is locked at any angle, the angle can be adjusted more conveniently, the inclination angle of the holder barrel can be accurately set by matching with an angle indicating disc, the actual situation of a site can be simulated as much as possible, and more real theoretical and technical guidance is provided for a development scheme of the site.
Drawings
FIG. 1 is a schematic structural diagram of a main body of the present invention;
FIG. 2 is a schematic view of another angle structure of the present invention;
FIG. 3 is a schematic view of a reinforcing frame according to the present invention;
FIG. 4 is a cross-sectional view of the present invention;
in the figure: 1-a gripper cylinder; 2-a first leg; 3-a second leg; 4-a third leg; 5-a fourth leg; 6-angle indicating dial; 7-universal stand bars; 8-a damped hinge; 9-confining pressure air inlet; 10-left plug; 11-right plug; 12-a pushing support; 13-reinforcing rods; 14-a latch; 15-a plug hole; 16-a support frame; 17-a rubber cylinder; 18-a first piston; 19-a second piston; 20-adjusting the rod; 21-a pressure sensor; 22-a propelling turntable; 23-a rotary joint; 24-a seal pad; 25-rotating flow guide cavity; 26-an air inlet; 27-an exhaust port; 28-liquid drain.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms, "upper", "lower", "left", "right", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Example 1
As shown in fig. 1-4, the invention discloses a bottom layer inclination angle simulated rock core sample holder, which comprises a holder cylinder 1, an adjusting support and an angle indicating disc 6, wherein damping hinges 8 are arranged at the centers of two sides of the holder cylinder 1, a confining pressure air inlet 9 is arranged at the center of each damping hinge 8, the confining pressure air inlet 9 is communicated with the inside of the holder cylinder 1, the adjusting support is rotatably connected with the holder cylinder 1 through the damping hinges 8, the angle indicating disc 6 is arranged at the center of the adjusting support, a pointer of the angle indicating disc 6 is in driving connection with the holder cylinder 1, the inclination angle of the holder cylinder 1 can be reflected through the jumping of the pointer, a universal support leg 7 is arranged at the bottom end of the adjusting support, the adjusting support comprises a first support leg 2, a second support leg 3, a third support leg 4 and a fourth support leg 5, the first support leg 2 and the second support leg 3 are arranged on one side of the holder cylinder 1, the first support leg 2 and the second support leg 3 are rotatably connected through the damping hinges 8, the third support leg 4 and the fourth support 5 are rotatably connected through the damping hinges 8, the supporting legs can be conveniently arranged, the angle of the holder cylinder 1 can be adjusted, and the angle of the holder cylinder can be adjusted on-site accurately adjusted, and the angle of the holder, the holder can be adjusted on-site.
Still be provided with stiffener 13 in first landing leg 2 and the third landing leg 4, the one end and first landing leg 2 of stiffener 13, third landing leg 4 rotates to be connected, the other end of stiffener 13 is pegged graft in first landing leg 2 and third landing leg 4 through bolt 14, second landing leg 3 and fourth landing leg 5 correspond and are provided with spliced eye 15, take off bolt 14 during the use, pack into spliced eye 15 with the other end of stiffener 13, and fix through bolt 14, the setting of stiffener 13, moreover, the steam generator is simple in structure, the equipment is convenient, can further promote the stability of holder barrel 1 when experiment.
The holder barrel 1 is made of polyether-ether-ketone or polyether-ether-ketone carbon fiber materials, absorption of X-rays during CT scanning of a metal barrel is avoided, a left plug 10 and a right plug 11 are arranged at the left end and the right end of the holder barrel 1, a spiral flow guide cavity 25 is arranged in the barrel wall of the holder barrel 1, an air inlet 26 is arranged at one end of the outer wall of the holder barrel 1, an air outlet 27 is arranged at the other end of the outer wall of the holder barrel 1, the spiral flow guide cavity 25 is arranged, circulating air can be used for quickly dissipating heat of the holder barrel 1, the rubber barrel 17 is prevented from being bonded on the surface of a rock core after being melted due to overheating, the holder barrel 1 is respectively in threaded connection with the left plug 10 and the right plug 11, a propelling support 12 is arranged on the right plug 11, the support frame 16, the rubber cylinder 17, the first piston 18 and the second piston 19 are sequentially arranged inside the holder cylinder 1, the first piston 18 and the second piston 19 are respectively arranged at two ends of the rubber cylinder 17, the first piston 18 and the second piston 19 are in sliding connection with the rubber cylinder 17, a sealing structure is formed inside the rubber cylinder 17, the second piston 19 is abutted to the left plug 10, an adjusting rod 20 is arranged at one end of the first piston 18, external threads are arranged on the outer surface of the adjusting rod 20, a pressure sensor 21 is installed on the adjusting rod 20, the other end of the adjusting rod 20 penetrates through the right plug 11 and is in threaded connection with the right plug 11, the adjusting rod 20 is in threaded connection with the propelling support 12, a propelling turntable 22 is installed at the top end of the adjusting rod 20, the screwing depth of the adjusting rod 20 can be adjusted by screwing the propelling turntable 22, and the core is fixed in a core displacement experiment.
The first piston 18, the second piston 19, the left plug 10 and the right plug 11 are all of a hollow structure, a liquid outlet 28 is formed in the outer side of the left plug 10, the adjusting rod 20 is of a hollow structure, one end of the adjusting rod 20 is communicated with the first piston 18, a sealing gasket 24 is arranged at the joint of the adjusting rod 20, a rotary joint 23 is arranged at the other end of the adjusting rod 20 and can be communicated with a liquid inlet pipe through the rotary joint 23, and due to the arrangement of the rotary joint 23, the situation that the liquid inlet pipe is rotationally blocked due to the rotation of the adjusting turntable 22 when the adjusting rod 20 is clamped and pressed is avoided.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (9)
1. The utility model provides a bottom inclination simulation rock core sample holder, its characterized in that, includes the holder barrel, adjusts support and angle indicating dial, adjust the center that the support set up in the outside of holding body barrel, it is connected with the rotation of holder barrel to adjust the support, the center of support is being adjusted in the setting of angle indicating dial, the pointer and the drive of holder barrel of angle indicating dial are connected, the bottom of adjusting the support is provided with universal stabilizer blade, it includes first landing leg, second landing leg, third landing leg and fourth landing leg to adjust the support, first landing leg and second landing leg setting are in one side of holder barrel, first landing leg and second landing leg rotate to be connected, third landing leg and fourth landing leg setting are at the opposite side of holder barrel, third landing leg and fourth landing leg rotate to be connected.
2. The bottom inclination angle simulated core sample holder as claimed in claim 1, further comprising damping hinges symmetrically arranged at the center of the side of the holder cylinder, the first leg and the second leg being rotatably connected by the damping hinges, and the third leg and the fourth leg being rotatably connected by the damping hinges.
3. The bottom-dip angle simulated core sample holder as claimed in claim 2, wherein a confining pressure air inlet is provided in the center of the damping hinge.
4. The bottom-dip angle simulated core sample holder as claimed in claim 1, wherein the holder barrel is made of polyetheretherketone or polyetheretherketone plus carbon fiber material.
5. The bottom inclination angle simulation core sample holder as claimed in claim 1, wherein a left plug and a right plug are arranged at the left end and the right end of a holder barrel, the holder barrel is respectively in threaded connection with the left plug and the right plug, a pushing support is arranged on the right plug, a support frame, a rubber barrel, a first piston and a second piston are sequentially arranged inside the holder barrel, the first piston and the second piston are respectively arranged at the two ends of the rubber barrel, the first piston and the second piston are slidably connected with the rubber barrel, the second piston is abutted against the left plug, an adjusting rod is arranged at one end of the first piston, external threads are arranged on the outer surface of the adjusting rod, a pressure sensor is arranged on the adjusting rod, the other end of the adjusting rod penetrates through the right plug and is in threaded connection with the right plug, the adjusting rod is in threaded connection with the pushing support, and a pushing turntable is arranged at the top end of the adjusting rod.
6. The bottom inclination angle simulation core sample holder according to claim 5, wherein the first piston, the second piston, the left plug and the right plug are all of a hollow structure, a liquid discharge port is formed in the outer side of the left plug, the adjusting rod is of a hollow structure, one end of the adjusting rod is communicated with the piston, and a rotary joint is arranged at the other end of the adjusting rod.
7. The bottom-dip angle simulated core sample holder as claimed in claim 6, wherein a seal is disposed at a connection between the first piston and the adjustment rod.
8. The bottom inclination angle simulated core sample holder as claimed in claim 1, further comprising a spiral flow guide cavity, wherein the spiral flow guide cavity is arranged in the cylinder wall of the holder cylinder, an air inlet is arranged at one end of the outer wall of the holder cylinder, and an air outlet is arranged at the other end of the outer wall of the holder cylinder.
9. The bottom inclination angle simulation core sample holder as claimed in claim 1, further comprising a reinforcing rod, wherein the reinforcing rod is rotatably arranged in the first supporting leg and the third supporting leg, one end of the reinforcing rod is rotatably connected with the first supporting leg and the third supporting leg, the other end of the reinforcing rod is inserted into the first supporting leg and the third supporting leg through a plug pin, and the second supporting leg and the fourth supporting leg are correspondingly provided with insertion holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211025934.1A CN115556056B (en) | 2022-08-25 | Bottom dip angle simulation core sample holder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211025934.1A CN115556056B (en) | 2022-08-25 | Bottom dip angle simulation core sample holder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115556056A true CN115556056A (en) | 2023-01-03 |
| CN115556056B CN115556056B (en) | 2024-05-31 |
Family
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000050962A (en) * | 1998-08-13 | 2000-02-22 | Pika Corporation:Kk | Foot table |
| CN202839661U (en) * | 2012-09-29 | 2013-03-27 | 英利能源（中国）有限公司 | Photovoltaic assembly and adjustable bracket of photovoltaic assembly |
| CN206027835U (en) * | 2016-08-28 | 2017-03-22 | 山东帝高漆业有限公司 | A water -cooled sand mill for paint production |
| CN108037006A (en) * | 2017-11-30 | 2018-05-15 | 成都岩心科技有限公司 | A kind of axial space adjusts core holding unit and application method |
| CN207944876U (en) * | 2018-02-13 | 2018-10-09 | 新昌县七星街道秀丽建材装饰材料经营部 | A kind of double ladder of folding adjustable angle |
| US20190211625A1 (en) * | 2018-01-07 | 2019-07-11 | Shmulik Shimon | Secure ladder |
| CN212280456U (en) * | 2020-04-23 | 2021-01-05 | 泉州市锦盛轻工制品有限公司 | Folding type beach article rack |
| CN214173326U (en) * | 2021-02-25 | 2021-09-10 | 火星营地(北京)教育科技有限公司 | Novel sextant convenient to operation |
| CN214560299U (en) * | 2021-03-31 | 2021-11-02 | 宁波锋成先进能源材料研究院有限公司 | Adjustable rock core clamping device |
| CN217060522U (en) * | 2022-02-25 | 2022-07-26 | 湖南省煤业集团马田矿业有限公司 | Angle positioning device for mining water transient prevention and control electromagnetic coil detection |
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000050962A (en) * | 1998-08-13 | 2000-02-22 | Pika Corporation:Kk | Foot table |
| CN202839661U (en) * | 2012-09-29 | 2013-03-27 | 英利能源（中国）有限公司 | Photovoltaic assembly and adjustable bracket of photovoltaic assembly |
| CN206027835U (en) * | 2016-08-28 | 2017-03-22 | 山东帝高漆业有限公司 | A water -cooled sand mill for paint production |
| CN108037006A (en) * | 2017-11-30 | 2018-05-15 | 成都岩心科技有限公司 | A kind of axial space adjusts core holding unit and application method |
| US20190211625A1 (en) * | 2018-01-07 | 2019-07-11 | Shmulik Shimon | Secure ladder |
| CN207944876U (en) * | 2018-02-13 | 2018-10-09 | 新昌县七星街道秀丽建材装饰材料经营部 | A kind of double ladder of folding adjustable angle |
| CN212280456U (en) * | 2020-04-23 | 2021-01-05 | 泉州市锦盛轻工制品有限公司 | Folding type beach article rack |
| CN214173326U (en) * | 2021-02-25 | 2021-09-10 | 火星营地(北京)教育科技有限公司 | Novel sextant convenient to operation |
| CN214560299U (en) * | 2021-03-31 | 2021-11-02 | 宁波锋成先进能源材料研究院有限公司 | Adjustable rock core clamping device |
| CN217060522U (en) * | 2022-02-25 | 2022-07-26 | 湖南省煤业集团马田矿业有限公司 | Angle positioning device for mining water transient prevention and control electromagnetic coil detection |
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