CN104989297A - Main tong of closed tong - Google Patents
Main tong of closed tong Download PDFInfo
- Publication number
- CN104989297A CN104989297A CN201510505288.2A CN201510505288A CN104989297A CN 104989297 A CN104989297 A CN 104989297A CN 201510505288 A CN201510505288 A CN 201510505288A CN 104989297 A CN104989297 A CN 104989297A
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- assembly
- cylinder assembly
- rotary cylinder
- pincers
- hydraulic cylinder
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- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 210000000080 chela (arthropods) Anatomy 0.000 claims description 59
- 229910052755 nonmetal Inorganic materials 0.000 claims description 3
- 150000002843 nonmetals Chemical class 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 230000000712 assembly Effects 0.000 abstract description 11
- 238000000429 assembly Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Landscapes
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
- Actuator (AREA)
Abstract
The invention discloses a main tong of a closed tong. The main tong of the closed tong comprises multi-way valve assemblies, a shell, a rotating cylinder assembly arranged in the shell, a large gear and multiple power shaft assemblies; a hydraulic motor with a speed reducer is arranged under each power shaft assembly, a shaft is connected with the hydraulic motors with the speed reducers, the large gear and the rotating cylinder assembly are fixed with each other, a hydraulic cylinder support is arranged above the rotating cylinder assembly, multiple hydraulic cylinder assemblies which are evenly distributed are installed on the hydraulic cylinder support, and a piston rod of each hydraulic cylinder assembly is provided with a circular-arc-shaped tooth plate; the multi-way valve assemblies are connected with an external hydraulic system, connected with each hydraulic motor with the speed reducer through a rubber pipe, and connected with the rotating cylinder assembly through flexible pipes; the rotating cylinder assembly is connected with the hydraulic cylinder assemblies through multiple sealing oil channels, therefore, oil pipe bodies can achieve the seamless or micro-damaged effect, and the using safety can be improved.
Description
Technical field
The present invention relates to technical field of petroleum machinery, particularly relate to one remain silent pincers main pincers.
Background technology
As everyone knows, well head automation, when workover treatment, is progressively carried out in oil field, to remain silent Qian Shang oil discharge pipe if adopted, one can realize single elevator operation, and it two adopts pincers of remaining silent can save artificial push-and-pull pliers back and forth, more than can reduce the labour intensity of workman, improve safety.In addition, oil field is in wellbore construction, sometimes according to the supporting needs of new technology new equipment, require that pliers can only stick of tool bar body, cannot stick of tool knock-off joint, pliers block teeth are to after the occlusion of drilling rod body, can only micro-damage, traditional rotary tong be two frontal plate to folder, every frontal plate only fills two block teeth, containment area is too little, forms very dark bite mark after occlusion.For gas well, particularly high sulfur Gas Fields, oil pipe, to overlap effective be anti-corrosion pipe, body is softer, during pliers clamping body, requires pliers to body without dental impression, pincers of remaining silent of the prior art are general all adopts planet pawl clamp system, point cantact between block teeth and body, dark especially to the bite mark of body, the even easily flat body of folder, after surface has the body of dental impression to go into the well, acid solution enters from dental impression gap, sour bad body, causes body to hang well accident, gas leakage accidents; In addition, when pincers of remaining silent of the prior art are detained in realization and shackle action exchanges, need to take cover plate apart, take out planet pawl, then turn over turnback, reinstall, the too tired lock of such action, operating efficiency is lower.
Therefore, be necessary to provide a kind of main pincers of pincers of remaining silent solved the problems of the technologies described above.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of main pincers of pincers of remaining silent reducing pipeline damage.
For achieving the above object, the technical solution used in the present invention is: one is remained silent and clamped main pincers, comprise: banked direction control valves assembly, housing and the rotary cylinder assembly be arranged in housing, gear wheel and several line shaft assembly, described housing comprises shell top wall and housing lower wall, described rotary cylinder assembly comprises: rotary cylinder, with the upper bracket of shell top wall phase fixing and the undersetting with housing lower wall phase fixing, clutch shaft bearing is provided with between described rotary cylinder and upper bracket, the second bearing is provided with between described rotary cylinder and undersetting, the central authorities of described rotary cylinder are provided with a through hole, each line shaft assembly comprises: upper cover plate, lower cover, axle and pinion integrated with axle, described upper cover plate and shell top wall phase fixing, described lower cover and housing lower wall phase fixing, the 3rd bearing is provided with between described axle and upper cover plate, the 4th bearing is provided with between described axle and lower cover, the below of each line shaft assembly is provided with band reducer hydraulic motor, described axle is connected with band reducer hydraulic motor, described pinion is meshed with gear wheel, described gear wheel and rotary cylinder assembly phase fixing, the top of described rotary cylinder assembly is provided with hydraulic cylinder leg, described hydraulic cylinder leg is provided with the hydraulic cylinder assembly of several even arrangement, the axis perpendicular of several hydraulic cylinder assembly and rotary cylinder is arranged, the piston rod of each hydraulic cylinder assembly is all provided with circular arc dental lamina, described banked direction control valves assembly is connected with external hydraulic system, be connected by sebific duct between described banked direction control valves assembly with each band reducer hydraulic motor, described banked direction control valves assembly is connected by flexible pipe with between rotary cylinder assembly, seal oil duct by several between described rotary cylinder assembly with several hydraulic cylinder assembly to be connected.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, described circular arc dental lamina be shiny surface by clamping the face that pipe fitting contacts, described circular arc dental lamina is made up of nonmetals.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, described circular arc dental lamina be serrated face by clamping the face that pipe fitting contacts, described circular arc dental lamina is made up of metal material.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, the quantity of described line shaft assembly and band reducer hydraulic motor is four.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, the oil circuit of four band reducer hydraulic motors adopts and is connected in parallel.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, described banked direction control valves assembly be provided with, shackle handle and clamping, release handle.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, described banked direction control valves assembly is connected with PLC.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, oil circuit, after banked direction control valves assembly and rotary cylinder assembly, is provided with diffluence motor and fine setting choke valve before entering hydraulic cylinder assembly.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, oil circuit, after banked direction control valves assembly and rotary cylinder assembly, is provided with booster and pressurize lock before entering hydraulic cylinder assembly.
Preferably, remain silent in the main pincers of pincers in above-mentioned one, the quantity of described hydraulic cylinder assembly is four.
Beneficial effect of the present invention is: the remaining silent main pincers of pincers in the present invention, solves existing pincers design of remaining silent unreasonable, causes damaging that oil pipe is serious, the problem of poor stability, and the remaining silent pincers in the present invention can make oil pipe body reach seamless or the effect of micro-damage; When upper shackle action is exchanged, do not need to open cover plate, ensure that operating efficiency and product quality and safety in utilization increases, thus reduce enterprise's cost of production and drop into, make enterprise remain advantage in market competition, be convenient to realize well head automation.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 remains silent in the present invention to clamp the structural representation of main pincers.
Fig. 2 is the sectional structure schematic diagram along the line of A-A shown in Fig. 1.
In Fig. 1 and Fig. 2: 1, banked direction control valves assembly, 2, housing, 3, rotary cylinder assembly, 4, gear wheel, 5, line shaft assembly, 6, shell top wall, 7, housing lower wall, 8, rotary cylinder, 9, upper bracket, 10, undersetting, 11, clutch shaft bearing, the 12, second bearing, 13, through hole, 14, upper cover plate, 15, lower cover, 16, axle, 17, pinion, 18, the 3rd bearing, the 19, the 4th bearing, 20, band reducer hydraulic motor, 21, hydraulic cylinder leg, 22, hydraulic cylinder assembly, 23, circular arc dental lamina, 24, sealing oil duct.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.The example of these preferred embodiments illustrates in the accompanying drawings.Shown in accompanying drawing and the embodiments of the present invention described with reference to the accompanying drawings be only exemplary, and the present invention is not limited to these embodiments.
At this, also it should be noted that, in order to avoid the present invention fuzzy because of unnecessary details, illustrate only in the accompanying drawings with according to the closely-related structure of the solution of the present invention and/or treatment step, and eliminate other details little with relation of the present invention.
Shown in ginseng Fig. 1 and Fig. 2, one is remained silent and is clamped main pincers, comprise: banked direction control valves assembly 1, housing 2 and the rotary cylinder assembly 3 be arranged in housing 2, gear wheel 4 and four line shaft assemblies 5, described housing 2 comprises shell top wall 6 and housing lower wall 7, described rotary cylinder assembly 3 comprises: rotary cylinder 8, with the upper bracket 9 of shell top wall 6 phase fixing and the undersetting 10 with housing lower wall 7 phase fixing, clutch shaft bearing 11 is provided with between described rotary cylinder 8 and upper bracket 9, the second bearing 12 is provided with between described rotary cylinder 8 and undersetting 10, the central authorities of described rotary cylinder 8 are provided with a through hole 13, each line shaft assembly 5 comprises: upper cover plate 14, lower cover 15, axle 16 and pinion 17 integrated with axle 16, described upper cover plate 14 and shell top wall 6 phase fixing, described lower cover 15 and housing lower wall 7 phase fixing, the 3rd bearing 18 is provided with between described axle 16 and upper cover plate 14, the 4th bearing 19 is provided with between described axle 16 and lower cover 15, the below of each line shaft assembly 5 is provided with band reducer hydraulic motor 20, described axle 16 is connected with band reducer hydraulic motor 20, described pinion 17 is meshed with gear wheel 4, described gear wheel 4 and rotary cylinder assembly 3 phase fixing, the top of described rotary cylinder assembly 3 is provided with hydraulic cylinder leg 21, described hydraulic cylinder leg 21 is provided with four hydraulic cylinder assemblies 22 of evenly arranging, each hydraulic cylinder assembly 22 is arranged with the axis perpendicular of rotary cylinder 8, clamping force is very large, frictional force can be made like this to increase, thus must moment of torsion be arrived.The piston rod of each hydraulic cylinder assembly 22 is all provided with circular arc dental lamina 23, and the contact area of circular arc dental lamina 23 is large, makes oil pipe surface uniform stressed, makes oil pipe indeformable.In the present embodiment, described circular arc dental lamina 23 be serrated face by clamping the face that pipe fitting contacts, described circular arc dental lamina 23 is made up of high-quality steel and through Overheating Treatment, can be made drilling rod body surface uniform stressed, realize micro-damage, certainly, in other embodiments, described circular arc dental lamina 23 with can be also shiny surface by clamping the face that pipe fitting contacts, when for shiny surface, described circular arc dental lamina is made up of nonmetals, can ensure the seamless effect of body.
Described banked direction control valves assembly 1 is connected with external hydraulic system, be connected by sebific duct between described banked direction control valves assembly 1 with each band reducer hydraulic motor 20, described banked direction control valves assembly 1 is connected by flexible pipe with between rotary cylinder assembly 3, seals oil duct 24 be connected between described rotary cylinder assembly 3 with several hydraulic cylinder assembly 22 by several.The oil circuit of four band reducer hydraulic motors 20 adopts and is connected in parallel.Described banked direction control valves assembly 1 is provided with, shackle handle and clamping, release handle, can realize Non-follow control, certainly, described banked direction control valves assembly 1 also can be connected with PLC, to realize Automated condtrol.Oil circuit is after banked direction control valves assembly 1 with rotary cylinder assembly 3, diffluence motor and fine setting choke valve is provided with before entering hydraulic cylinder assembly 22, thus can ensure that the piston rod of four hydraulic cylinder assemblies 22 is synchronized with the movement, oil circuit is after banked direction control valves assembly 1 with rotary cylinder assembly 3, before entering hydraulic cylinder assembly 22, be provided with booster and pressurize lock, thus the clamping pressure that the piston rod of hydraulic cylinder assembly 22 is powerful can be ensured.
The operating principle clamping main pincers of remaining silent in the present invention is: main pincers are when workover treatment, the main pincers of pincers of remaining silent are horizontal positioned, play oil pipe or lower oil pipe to be directly through to remain silent and to clamp the intermediate throughholes of main pincers, when needing clamping, operation banked direction control valves assembly 1 clamping lever, the piston rod of four hydraulic cylinder assemblies 22 synchronously stretches out, circular arc dental lamina 23 clamps oil pipe, when needs are buckled, attacker's handle on operation banked direction control valves assembly 1, circular arc dental lamina 23 is bitten the surface of body and is started to rotate, provide the effect of reaction torque at back-up tong under, form moment of torsion, can button be completed; When needing shackle, then operate banked direction control valves assembly 1 shackle handle, circular arc dental lamina is bitten tube surfaces and is started to rotate toward shackle direction, under providing the effect of reaction torque, forms moment of torsion, can complete shackle at back-up tong; When needing to unclamp, operation banked direction control valves assembly 1 release handle, the piston synchronous of four hydraulic cylinder assemblies 22 is retracted, and circular arc dental lamina 23 leaves body.The oil circuit that clamping, the oil circuit unclamped and upper shackle rotate independently separates, the oil circuit rotated is that external hydraulic system is first connected with banked direction control valves assembly 1, and then pass through the oil inlet and outlet of sebific duct connecting band reducer hydraulic motor 20, then the transmission of line shaft assembly 5 and gear wheel 4 is passed through, rotary cylinder assembly 3 is driven to rotate, thus drive the several hydraulic cylinder assemblies 22 above rotary cylinder assembly 3 to rotate, gear wheel 4, rotary cylinder assembly 3, hydraulic cylinder leg 21, hydraulic cylinder assembly 22 they be synchronously to rotate continuously; Main clamp is tight, unclamp oil circuit be by rotary cylinder assembly 3 inside sealing oil duct 24 be connected to hydraulic cylinder assembly 22, and have the sealing of revolution pressure-resistant seal, when design can ensure that main pincers clamping cylinder clamps body like this, energy rotation with pressure.
In sum, the remaining silent main pincers of pincers in the present invention, solve existing pincers design of remaining silent unreasonable, cause damaging that oil pipe is serious, the problem of poor stability, and the remaining silent pincers in the present invention can make oil pipe body reach seamless or the effect of micro-damage; When upper shackle action is exchanged, do not need to open cover plate, ensure that operating efficiency and product quality and safety in utilization increases, thus reduce enterprise's cost of production and drop into, make enterprise remain advantage in market competition, be convenient to realize well head automation.
Finally, also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.
Claims (10)
1. the main pincers of pincers of remaining silent, it is characterized in that, comprise: banked direction control valves assembly, housing and the rotary cylinder assembly be arranged in housing, gear wheel and several line shaft assembly, described housing comprises shell top wall and housing lower wall, described rotary cylinder assembly comprises: rotary cylinder, with the upper bracket of shell top wall phase fixing and the undersetting with housing lower wall phase fixing, clutch shaft bearing is provided with between described rotary cylinder and upper bracket, the second bearing is provided with between described rotary cylinder and undersetting, the central authorities of described rotary cylinder are provided with a through hole, each line shaft assembly comprises: upper cover plate, lower cover, axle and pinion integrated with axle, described upper cover plate and shell top wall phase fixing, described lower cover and housing lower wall phase fixing, the 3rd bearing is provided with between described axle and upper cover plate, the 4th bearing is provided with between described axle and lower cover, the below of each line shaft assembly is provided with band reducer hydraulic motor, described axle is connected with band reducer hydraulic motor, described pinion is meshed with gear wheel, described gear wheel and rotary cylinder assembly phase fixing, the top of described rotary cylinder assembly is provided with hydraulic cylinder leg, described hydraulic cylinder leg is provided with the hydraulic cylinder assembly of several even arrangement, the axis perpendicular of several hydraulic cylinder assembly and rotary cylinder is arranged, the piston rod of each hydraulic cylinder assembly is all provided with circular arc dental lamina, described banked direction control valves assembly is connected with external hydraulic system, be connected by sebific duct between described banked direction control valves assembly with each band reducer hydraulic motor, described banked direction control valves assembly is connected by flexible pipe with between rotary cylinder assembly, seal oil duct by several between described rotary cylinder assembly with several hydraulic cylinder assembly to be connected.
2. one as claimed in claim 1 is remained silent the main pincers of pincers, it is characterized in that: described circular arc dental lamina be shiny surface by clamping the face that pipe fitting contacts, described circular arc dental lamina is made up of nonmetals.
3. one as claimed in claim 1 is remained silent the main pincers of pincers, it is characterized in that: described circular arc dental lamina be serrated face by clamping the face that pipe fitting contacts, described circular arc dental lamina is made up of metal material.
4. one as claimed in claim 1 is remained silent and is clamped main pincers, it is characterized in that: the quantity of described line shaft assembly and band reducer hydraulic motor is four.
5. one as claimed in claim 4 is remained silent and is clamped main pincers, it is characterized in that: the oil circuit of four band reducer hydraulic motors adopts and is connected in parallel.
6. one as claimed in claim 1 is remained silent the main pincers of pincers, it is characterized in that: described banked direction control valves assembly is provided with, shackle handle and clamping, release handle.
7. one as claimed in claim 1 is remained silent and is clamped main pincers, it is characterized in that: described banked direction control valves assembly is connected with PLC.
8. one as claimed in claim 1 is remained silent and is clamped main pincers, it is characterized in that: oil circuit, after banked direction control valves assembly and rotary cylinder assembly, is provided with diffluence motor and fine setting choke valve before entering hydraulic cylinder assembly.
9. one as claimed in claim 1 is remained silent and is clamped main pincers, it is characterized in that: oil circuit, after banked direction control valves assembly and rotary cylinder assembly, is provided with booster and pressurize lock before entering hydraulic cylinder assembly.
10. one as claimed in claim 1 is remained silent and is clamped main pincers, it is characterized in that: the quantity of described hydraulic cylinder assembly is four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510505288.2A CN104989297B (en) | 2015-08-18 | 2015-08-18 | One kind, which is remained silent, clamps main pincers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510505288.2A CN104989297B (en) | 2015-08-18 | 2015-08-18 | One kind, which is remained silent, clamps main pincers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104989297A true CN104989297A (en) | 2015-10-21 |
| CN104989297B CN104989297B (en) | 2018-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510505288.2A Active CN104989297B (en) | 2015-08-18 | 2015-08-18 | One kind, which is remained silent, clamps main pincers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104989297B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029962A (en) * | 2019-05-13 | 2019-07-19 | 江苏申利达机械制造有限公司 | Drilling and repairing well drilling tool check valve, oil pipe plug valve remotely quickly rob connection device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3516308A (en) * | 1967-12-04 | 1970-06-23 | Byron Jackson Inc | Power pipe tong transmission assembly |
| CN201443318U (en) * | 2008-10-18 | 2010-04-28 | 西南石油大学 | Power clamp for continuous cycling drilling operation |
| CN202832304U (en) * | 2012-10-17 | 2013-03-27 | 江苏如石机械有限公司 | Power tong automatic door interlocking mechanism |
| CN203515391U (en) * | 2013-10-15 | 2014-04-02 | 江苏申利达机械制造有限公司 | Large-torque makeup and breakout unit capable of rotating continuously by 360 degrees |
| CN103939038A (en) * | 2014-04-10 | 2014-07-23 | 江苏申利达机械制造有限公司 | Hydraulic power tongs without tooth marks |
| CN204827282U (en) * | 2015-08-18 | 2015-12-02 | 江苏申利达机械制造有限公司 | Main pincers of pincers of remaining silent |
-
2015
- 2015-08-18 CN CN201510505288.2A patent/CN104989297B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3516308A (en) * | 1967-12-04 | 1970-06-23 | Byron Jackson Inc | Power pipe tong transmission assembly |
| CN201443318U (en) * | 2008-10-18 | 2010-04-28 | 西南石油大学 | Power clamp for continuous cycling drilling operation |
| CN202832304U (en) * | 2012-10-17 | 2013-03-27 | 江苏如石机械有限公司 | Power tong automatic door interlocking mechanism |
| CN203515391U (en) * | 2013-10-15 | 2014-04-02 | 江苏申利达机械制造有限公司 | Large-torque makeup and breakout unit capable of rotating continuously by 360 degrees |
| CN103939038A (en) * | 2014-04-10 | 2014-07-23 | 江苏申利达机械制造有限公司 | Hydraulic power tongs without tooth marks |
| CN204827282U (en) * | 2015-08-18 | 2015-12-02 | 江苏申利达机械制造有限公司 | Main pincers of pincers of remaining silent |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029962A (en) * | 2019-05-13 | 2019-07-19 | 江苏申利达机械制造有限公司 | Drilling and repairing well drilling tool check valve, oil pipe plug valve remotely quickly rob connection device |
| CN110029962B (en) * | 2019-05-13 | 2023-08-29 | 江苏申利达机械制造有限公司 | Remote quick-connection device for check valve and oil pipe plug valve of drilling tool for drilling and repairing well |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104989297B (en) | 2018-02-09 |
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| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A type of closed pliers main pliers Granted publication date: 20180209 Pledgee: Bank of China Limited Jianhu Branch Pledgor: JIANGSU SHENLIDA MACHINERY MANUFACTURE CO.,LTD. Registration number: Y2024980007556 |
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