CN114195061B - Portable manhole cover opening device and use method thereof - Google Patents
Portable manhole cover opening device and use method thereof Download PDFInfo
- Publication number
- CN114195061B CN114195061B CN202111341021.6A CN202111341021A CN114195061B CN 114195061 B CN114195061 B CN 114195061B CN 202111341021 A CN202111341021 A CN 202111341021A CN 114195061 B CN114195061 B CN 114195061B
- Authority
- CN
- China
- Prior art keywords
- manhole cover
- bar
- pedal
- pry
- connecting rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 3
- 210000001364 upper extremity Anatomy 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 description 9
- 238000007689 inspection Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F19/00—Hoisting, lifting, hauling or pushing, not otherwise provided for
- B66F19/005—Lifting devices for manhole covers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a portable manhole cover opening device, which comprises: the pedal part comprises a pedal, a pedal support rod and a pedal connecting rod which are connected in sequence; the prying bar part comprises a prying bar, a fixed platform and a prying bar connecting rod, wherein the fixed platform and the prying bar connecting rod are arranged at two ends of the prying bar, a first fixed shaft is penetrated in the fixed platform, and a first fixed bar which is used for being inserted into a prying cover hole of a manhole cover is arranged at the lower end of the first fixed shaft; two ends of the pry bar connecting rod are respectively provided with a hollow pry bar shaft sleeve, and the outer side of each pry bar shaft sleeve is provided with a pry bar clamping seat; the leg part comprises a leg connecting rod, a main leg rotationally connected with the leg connecting rod and a branch leg arranged at two ends of the leg connecting rod; the invention also provides a using method of the portable manhole cover opening device. The invention has the advantages that: the lever principle is adopted, and the manhole cover is pried up by means of the weight of a human body, so that people with weak upper limb strength can use the manhole cover conveniently; adopt collapsible design, make things convenient for single carrying.
Description
Technical Field
The invention relates to the technical field of inspection well operation and maintenance, in particular to a portable inspection well lid opening device and a using method thereof.
Background
In the daily maintenance and running state monitoring work of municipal pipe network, the manhole cover needs to be frequently opened. The design and the installation mode of the existing manhole cover are mainly safe, antitheft and durable, and lack of convenient opening consideration, so that the manhole cover is opened by adopting a construction crowbar at present. The method is time-consuming and labor-consuming, the personnel to be opened is required to have stronger upper limb force, and part of square manhole covers cannot be opened; in addition, the loss of each opening is also larger, because the crowbar can cause damage to the composite material and the prying hole of the thin-wall manhole cover.
In order to enable operation and maintenance personnel to conveniently and rapidly open the manhole cover, an opening device which can be used by a single person, is easy to carry and use and has small loss on the manhole cover is urgently needed at present, and is used for opening the manhole cover.
Disclosure of Invention
The invention aims to provide a portable manhole cover opening device which is used for solving the defects in the prior art.
The invention provides a portable manhole cover opening device, which comprises: the pedal part comprises a pedal, a pedal support rod and a pedal connecting rod which are sequentially connected, two hollow pedal shaft sleeves are respectively arranged at two ends of the pedal connecting rod, and a pedal clamping block is arranged at the inner side of each pedal shaft sleeve; the pry bar part comprises a pry bar, a fixed platform and a pry bar connecting rod, wherein the fixed platform and the pry bar connecting rod are arranged at two ends of the pry bar, a first fixed shaft is arranged in the fixed platform in a penetrating manner, and a first fixed rod which is used for being inserted into a pry cover hole of a manhole cover is arranged at the lower end of the first fixed shaft; two hollow pry bar shaft sleeves are respectively arranged at two ends of the pry bar connecting rod, and a pry bar clamping seat is arranged at the outer side of each pry bar shaft sleeve; the support leg comprises a support leg connecting rod, a main support leg rotationally connected with the support leg connecting rod and branch legs arranged at two ends of the support leg connecting rod; during assembly, the support leg connecting rod penetrates through the pry bar shaft sleeve and the pedal shaft sleeve, the branch legs are in butt joint with the outer side of the pedal shaft sleeve, the pedal clamping blocks are clamped in the pry bar clamping seats, and the main support legs are located between the two pry bar shaft sleeves.
Preferably, the pry bar is further connected with a sliding platform in a sliding manner, a second fixing shaft is arranged in the sliding platform in a penetrating manner, and a second fixing rod is arranged at the end part of the second fixing shaft.
Preferably, the lower end of the second fixing shaft is provided with the second fixing rod, and the upper end of the second fixing shaft is provided with a spiral cover.
Preferably, damping glue is laid at the contact position of the sliding platform and the pry bar.
Preferably, the pry bar is also provided with a vibrator fixing platform for installing a vibrator.
The invention also provides a using method of the portable manhole cover opening device, which comprises the following steps:
s1, inserting a first fixing rod into a prying hole of a manhole cover so that the first fixing rod clamps the manhole cover;
s2, a person steps on the pedal by using feet to pry the manhole cover away from the manhole cover.
Preferably, the pry bar is also connected with a sliding platform in a sliding way, a second fixed shaft is arranged in the sliding platform in a penetrating way, and a second fixed rod is arranged at the end part of the second fixed shaft; when the manhole cover is operated to be easy to damage or large in thickness, the S1 further comprises: and adjusting the position of the sliding platform on the pry bar, and inserting the second fixing bar into the other pry cover hole of the manhole cover so that the second fixing bar clamps the manhole cover.
Preferably, the two ends of the first fixed shaft are provided with the first fixed rod; when the manhole cover with larger mass works, the S2 further comprises: one person steps on the pedal by using a foot, the other person uses a rope to cover a first fixing rod at the upper end of a first fixing shaft, and the two persons cooperate to pry the manhole cover away from the manhole cover.
Preferably, the pry bar is also provided with a vibrator fixing platform for installing a vibrator; when the manhole cover stuck by the sludge is operated, the S1 further comprises: and opening the vibrator to loosen soil around the manhole cover.
The invention has the advantages that:
1) The lever principle is adopted, and the manhole cover is pried up by means of the weight of a human body, so that people with weak upper limb strength can use the manhole cover conveniently;
2) The pedal reinforcing ribs are arranged on the pedal, so that a user can conveniently apply radial torque besides reinforcing the pedal, and the manhole cover is moved out of the manhole ring;
3) The vibrator is loaded, so that the vibrator has the vibrating and loosening function on the inspection well cover covering the mud prying hole and the mud filling inspection well ring and the inspection well cover gap, and the inspection well cover is convenient to open;
4) Adopt collapsible design, make things convenient for single carrying, be convenient for survey, fortune dimension personnel to use.
Drawings
FIG. 1 is a side view of a vibrator;
FIG. 2 is a top view of the footrest;
FIG. 3 is a top view of the pry bar;
FIG. 4 is a front view of the pry bar;
FIG. 5 is a side view of the pry bar;
FIG. 6 is a top view of the leg portion;
FIG. 7 is a schematic view showing an operating state of the portable manhole cover opening device of the present invention;
FIG. 8 is a top view of the portable manhole cover opening device of the present invention in a folded state;
fig. 9 is a schematic view showing a folded state of the portable manhole cover opening device of the present invention.
Description of element numbers:
1. vibrator
2. Fixing screw
3. Fixing nut
4. Pedal plate
5. Pedal reinforcing rib
6. Pedal strut
7. Pedal connecting rod
8. Pedal shaft sleeve
9. Pedal clamping block
10. First fixed shaft
11. First fixing rod
12. Fixed platform
13. Vibrator fixing platform
14. Fixing hole
15. Sliding platform
16. Screw cap
17. Second fixed shaft
18. Second fixing rod
19. Pry bar clamping seat
20. Pry bar shaft sleeve
21. Pry bar connecting rod
22. Pry bar
23. Stand bar connecting rod
24. Main support leg
25. Separating support
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to be limiting.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention provides a portable manhole cover opening device, which comprises: pedal portion, crow bar portion and foot portion. When the device is used, the manhole cover is clamped by the pry bar part, the supporting part provides support for the lever supporting point, the pedal part provides external force to pry the pry bar part, and then the manhole cover is quickly opened.
The pedal part is shown in fig. 2, and comprises a pedal 4, a pedal support rod 6 and a pedal connecting rod 7 which are sequentially connected, wherein two hollow pedal shaft sleeves 8 are respectively arranged at two ends of the pedal connecting rod 7, and a pedal clamping block 9 is arranged at the inner side of each pedal shaft sleeve 8. Because the pedal clamping block 9 receives larger torque, the thick-wall steel pipe is preferably integrally processed and molded. Reinforcing ribs are preferably provided at the connection of the pedal strut 6 and the pedal link 7 and at the connection of the pedal link 7 and the pedal bushing 8 for reinforcing the structural strength. The pedal reinforcing rib 5 is welded on one side surface of the pedal 4, when the device is in a working state, the pedal reinforcing rib 5 faces upwards, which is convenient for a user to apply radial torque besides reinforcing the pedal 4, and the manhole cover is moved out of the manhole ring.
The pry bar part is shown in fig. 3-5, and comprises a pry bar 22, and a fixed platform 12, a vibrator fixed platform 13, a sliding platform 15 and a pry bar connecting rod 21 which are arranged along the length direction of the pry bar 22, wherein the fixed platform 12 and the pry bar connecting rod 21 are respectively welded at two ends of the pry bar 22. The fixed platform 12 is provided with a round hole, a first fixed shaft 10 is arranged in the round hole in a penetrating way, and the first fixed shaft 10 can slide freely in the hole along the axial direction of the round hole and rotate freely in the radial direction. The fixed platform 12 has a thickness so as to assist the first fixed shaft 10 in sharing part of the shear stress. A first fixing rod 11 for being inserted into a prying hole of the manhole cover is welded at two ends of the first fixing shaft 10, and the first fixing rod 11 is perpendicular to the first fixing shaft 10. The vibrator fixing platform 13 is provided with a fixing hole 14, the vibrator 1 is provided with a fixing screw rod 2 and a fixing nut 3 as shown in fig. 1, and the vibrator fixing platform internally comprises two groups of batteries, an eccentric wheel and a motor, and a group of switches, so that vertical and horizontal vibration can be realized. The fixing screw rod 2 and the fixing nut 3 can be arranged in the fixing hole 14 to drive each part on the pry bar 22 to vibrate, and quick assembly, disassembly and replacement are realized. The contact between the sliding platform 15 and the pry bar 22 is laid with damping glue which can slide freely along the pry bar 22 without being subjected to radial force. A round hole is arranged in the sliding platform 15, a second fixed shaft 17 is arranged in the round hole in a penetrating way, and the second fixed shaft 17 can slide freely in the hole along the axial direction of the round hole and rotate freely in the radial direction. The sliding platform 15 has a certain thickness and thus can help the second stationary shaft 17 to share part of the shear stress. The upper end of the second fixed shaft 17 is connected with a screw cap 16 in a threaded manner, the lower end of the second fixed shaft 17 is welded with a second fixed rod 18, and the second fixed rod 18 is perpendicular to the second fixed shaft 17. The operator can twist the screw cap 16 to drive the second fixing rod 18 to rotate, and the screw cap 16 is detachable, so that the screw cap is convenient to use and maintain. Two ends of the pry bar connecting rod 21 are respectively provided with a hollow pry bar shaft sleeve 20, and the outer side of each pry bar shaft sleeve 20 is provided with a pry bar clamping seat 19.
The leg portion is shown in fig. 6, and includes a leg link 23, a main leg 24 rotatably connected to the leg link 23 vertically, and branch legs 25 provided at both ends of the leg link 23, the main leg 24 being located between the two branch legs 25 at the middle of the leg link 23.
As shown in fig. 7-9, when assembled, the leg link 23 sequentially penetrates the crow bar sleeve 20 and the pedal sleeve 8, the branch leg 25 is abutted against the outer side of the pedal sleeve 8, the pedal clamping block 9 is clamped in the crow bar clamping seat 19, and the main leg 24 is positioned between the two crow bar sleeves 20.
The invention also provides a using method of the portable manhole cover opening device, which comprises the following steps:
as shown in fig. 7 to 9, before the operation, the fixing nut 3 is unscrewed, and the vibrator 1 is taken out from the vibrator fixing platform 13 and fully charged. The screw cap 16 is removed, the second fixed shaft 17 is removed from the slide platform 15, the slide platform 15 is moved to a position on the pry bar 22, and the pedal portion is folded so that the pedal rod 6 is parallel to the pry bar 22. The vibrator 1, the fixing screw rod 2, the fixing nut 3, the spiral cover 16 and the second fixing shaft 17 are well received, and the pedal support rod 6 and the pry bar 22 are bound and fixed by passing a rope through the fixing hole 14. Since the main leg 24 is rotatable, it can function as a stand support. On the way to the operation place, the device in the folded state can be bound on the transportation means, so that the device is very convenient to carry or hold.
When the common manhole cover is operated, the method comprises the following steps:
s1, untying a rope, inserting a first fixing rod 11 into a prying hole of a manhole cover, and rotating the first fixing rod 11 to enable the first fixing rod 11 to clamp the manhole cover;
s2, turning over the pedal part to form an obtuse angle between the pedal support rod 6 and the pry bar 22, and then stepping on the pedal 4 by one person to pry the manhole cover away from the manhole cover. The pedal reinforcing rib 5 can be forced by the pedal foot to push the manhole cover completely away from the manhole cover.
When the manhole cover is easy to damage or has larger thickness, the S1 further comprises: a second fixing rod 17 is installed in the sliding platform 15, and a screw cap 16 is screwed on an upper end of the second fixing rod 17. The position of the sliding platform 15 on the pry bar 22 is adjusted, the second fixing bar 18 is inserted into the other pry cover hole of the manhole cover, and the rotary cover 16 is rotated, so that the second fixing bar 18 clamps the manhole cover.
When the manhole cover with larger mass works, the step S2 further comprises the following steps: one person steps on the pedal 4 by foot, the other person uses a rope to sleeve the first fixing rod 11 positioned at the upper end of the first fixing shaft 10, and the two persons cooperate to pry the manhole cover away from the manhole cover.
When working on the manhole cover stuck by the sludge, the step S1 further includes: the vibrator 1 is arranged on the vibrator fixing platform 13, and the vibrator 1 is opened to loosen soil around the manhole cover.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (8)
1. A portable manhole cover opening device, comprising:
the pedal part comprises a pedal (4), a pedal support rod (6) and a pedal connecting rod (7) which are sequentially connected, two hollow pedal shaft sleeves (8) are respectively arranged at two ends of the pedal connecting rod (7), and a pedal clamping block (9) is arranged at the inner side of each pedal shaft sleeve (8);
the prying bar part comprises a prying bar (22), fixed platforms (12) and prying bar connecting rods (21) which are arranged at two ends of the prying bar (22), a first fixed shaft (10) is arranged in the fixed platform (12) in a penetrating manner, and a first fixed bar (11) which is used for being inserted into a prying cover hole of a manhole cover is arranged at the lower end of the first fixed shaft (10); two ends of the prying bar connecting rod (21) are respectively provided with a hollow prying bar shaft sleeve (20), and the outer side of each prying bar shaft sleeve (20) is provided with a prying bar clamping seat (19); the pry bar (22) is also connected with a sliding platform (15) in a sliding way, a second fixed shaft (17) is penetrated in the sliding platform (15), and a second fixed bar (18) is arranged at the end part of the second fixed shaft (17);
the support leg comprises a support leg connecting rod (23), a main support leg (24) rotationally connected with the support leg connecting rod (23) and branch legs (25) arranged at two ends of the support leg connecting rod (23);
during assembly, the support leg connecting rods (23) penetrate through the pry bar shaft sleeves (20) and the pedal shaft sleeves (8), the branch legs (25) are in butt joint with the outer sides of the pedal shaft sleeves (8), the pedal clamping blocks (9) are clamped in the pry bar clamping seats (19), and the main leg (24) is located between the two pry bar shaft sleeves (20).
2. The portable manhole cover opening device according to claim 1, wherein the second fixing shaft (17) is provided with the second fixing rod (18) at a lower end and a screw cap (16) at an upper end.
3. The portable manhole cover opening device according to claim 1, wherein damping glue is laid at the contact of the sliding platform (15) and the pry bar (22).
4. The portable manhole cover opening device according to claim 1, wherein the pry bar (22) is further provided with a vibrator fixing platform (13) for mounting the vibrator (1).
5. A method of using the portable manhole cover opening device of claim 1, comprising the steps of:
s1, inserting a first fixing rod (11) into a prying hole of a manhole cover, so that the first fixing rod (11) clamps the manhole cover;
s2, a person steps on the pedal (4) by feet to pry the manhole cover away from the manhole cover.
6. The use method of the portable manhole cover opening device according to claim 5, wherein the pry bar (22) is further connected with a sliding platform (15) in a sliding manner, a second fixed shaft (17) is penetrated in the sliding platform (15), and a second fixed rod (18) is arranged at the end part of the second fixed shaft (17);
when the manhole cover is operated to be easy to damage or large in thickness, the S1 further comprises: and adjusting the position of the sliding platform (15) on the pry bar (22), and inserting the second fixing bar (18) into the other pry cover hole of the manhole cover so that the second fixing bar (18) clamps the manhole cover.
7. The method for using the portable manhole cover opening device according to claim 5, wherein the first fixing rods (11) are arranged at both ends of the first fixing shaft (10);
when the manhole cover with larger mass works, the S2 further comprises: one person steps on the pedal (4) by foot, the other person uses a rope to cover a first fixed rod (11) positioned at the upper end of a first fixed shaft (10), and the two persons cooperate to pry the manhole cover away from the manhole cover.
8. The method of using a portable manhole cover opening device according to claim 5, wherein the pry bar (22) is further provided with a vibrator fixing platform (13) for mounting a vibrator (1);
when the manhole cover stuck by the sludge is operated, the S1 further comprises: and opening the vibrator (1) to loosen soil around the manhole cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111341021.6A CN114195061B (en) | 2021-11-12 | 2021-11-12 | Portable manhole cover opening device and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111341021.6A CN114195061B (en) | 2021-11-12 | 2021-11-12 | Portable manhole cover opening device and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114195061A CN114195061A (en) | 2022-03-18 |
| CN114195061B true CN114195061B (en) | 2024-02-23 |
Family
ID=80647542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111341021.6A Active CN114195061B (en) | 2021-11-12 | 2021-11-12 | Portable manhole cover opening device and use method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114195061B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200201485Y1 (en) * | 2000-05-23 | 2000-11-01 | 나경민 | Opening or shutting equipment of manhole cover |
| CN206070583U (en) * | 2016-08-30 | 2017-04-05 | 国脉科技股份有限公司 | Piping shaft opener |
| CN210683138U (en) * | 2019-11-03 | 2020-06-05 | 台州学院 | An inspection well cover opening device |
| CN211444959U (en) * | 2019-10-23 | 2020-09-08 | 王明磊 | Auxiliary opening device for road well cover |
| CN213707673U (en) * | 2020-10-19 | 2021-07-16 | 长春市城建维护集团股份有限公司 | Manhole cover opening tool |
| CN214031620U (en) * | 2020-12-29 | 2021-08-24 | 湖南科技大学 | Steel rope foldable structure square manhole cover opening device |
-
2021
- 2021-11-12 CN CN202111341021.6A patent/CN114195061B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200201485Y1 (en) * | 2000-05-23 | 2000-11-01 | 나경민 | Opening or shutting equipment of manhole cover |
| CN206070583U (en) * | 2016-08-30 | 2017-04-05 | 国脉科技股份有限公司 | Piping shaft opener |
| CN211444959U (en) * | 2019-10-23 | 2020-09-08 | 王明磊 | Auxiliary opening device for road well cover |
| CN210683138U (en) * | 2019-11-03 | 2020-06-05 | 台州学院 | An inspection well cover opening device |
| CN213707673U (en) * | 2020-10-19 | 2021-07-16 | 长春市城建维护集团股份有限公司 | Manhole cover opening tool |
| CN214031620U (en) * | 2020-12-29 | 2021-08-24 | 湖南科技大学 | Steel rope foldable structure square manhole cover opening device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114195061A (en) | 2022-03-18 |
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