CN205640028U - Plugging device for pipeline - Google Patents
Plugging device for pipeline Download PDFInfo
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- CN205640028U CN205640028U CN201620420582.3U CN201620420582U CN205640028U CN 205640028 U CN205640028 U CN 205640028U CN 201620420582 U CN201620420582 U CN 201620420582U CN 205640028 U CN205640028 U CN 205640028U
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Abstract
The utility model provides a plugging device for pipeline, including the plugging device flange, be equipped with the cavity that runs through from top to bottom along the axial in the plugging device flange, be equipped with the shutoff main shaft in the cavity and the shutoff main shaft can reciprocate in the cavity, the inside of shutoff main shaft is equipped with the air vent along the axial, the upper end and the lower extreme of air vent all are equipped with a quick -operation joint, a quick -operation joint threaded connection is and be linked together with the air vent on the shutoff main shaft, the lower extreme fixedly connected with hinge formula leather cup shutoff head of shutoff main shaft, the upper end of hinge formula leather cup shutoff head is equipped with the hose, the hose is connected with a quick -operation joint of air vent lower extreme. The utility model discloses can be convenient and reliablely release the maintenance pipeline and press and the pressurization, prevent that shutoff scalp bowl periphery in the plugging device from turning over and roll over excessively and can not form good sealedly.
Description
Technical field
This utility model belongs to pipe plugging technical field, is specifically related to a kind of pipeline device.
Background technology
The aspects such as currently, pipeline has become as an important part for urban infrastructure, and it is at transporting oil, aqueous vapor have high efficiency and convenience, and the life with people is closely bound up, and along with the big quantization of pipe laying, pipeline fault also happens occasionally.During at present municipal pipeline engineering relating to relocate in municipal administration and rush to repair, in order to reduce the adverse effect that backend user is used, it is often necessary to operating pipeline is implemented non-stop plugging operation.It is typically to offer plugging hole in the upstream and downstream position of maintenance pipeline, block head is placed in pipeline and blocks, set up and while bypass line makes it possible to normally use, carry out maintenance replacing, stopper and block head are with the use of being greatly improved closure efficiency and plugging effect, the pressure in release maintenance pipeline is needed before additionally keeping in repair pipeline after closure, the pressure in first equalizing main is needed, it is to avoid cause security incident because pressure differential is excessive after maintenance pipeline.The design of the block head in plugging device directly affects the quality of closure quality, should ensure the sealing effectiveness of closure, also to consider the closure destructiveness to pipeline, generally use multi-clove type or the block head of multi-stack, so can reduce the openings of sizes on pipeline.The metal support edge of traditional block head is thin, is easily deformed, and makes block head be easily damaged, and causes and blocks unsuccessfully, brings difficulty to the installation of workman, and installation effectiveness is low.
Utility model content
The problems referred to above that this utility model exists for prior art, it is provided that a kind of pipeline device, it is possible to easily and reliably to maintenance pipeline release of pressure and pressurization, prevent the turnover of the block head leather cup periphery in stopper from excessively can not form good sealing.
This utility model adopts the following technical scheme that
A kind of pipeline device, including stopper flange, is provided with the cavity run through up and down vertically in described stopper flange, be provided with closure main shaft and described closure main shaft can move up and down in cavity in described cavity；Block main shaft is axially inside provided with passage, and the top and bottom of described passage are equipped with the first snap joint, and described first snap joint is threadedly connected to block on main shaft and is connected with passage；The lower end of described closure main shaft is fixedly connected with hinge-type leather cup block head, and the upper end of described hinge-type leather cup block head is provided with flexible pipe, and described flexible pipe is connected with the first snap joint of passage lower end；
The outer cover of closure main shaft is provided with feed mechanism, described feed mechanism includes driving sleeve, operation handle, transition axle sleeve and spacer, described driving sleeve be sheathed on closure main shaft outside and with closure main shaft axial restraint, described operation handle is located at the upper end and being bolted of closure main shaft and is fixed on driving sleeve, the bottom of driving sleeve is provided with screwed hole vertically, described spacer is installed in described screwed hole and is sheathed on the outside of closure main shaft, described transition axle sleeve is sheathed on the outside of driving sleeve and threadeds with driving sleeve, the upper end of transition axle sleeve is provided with rotary handle, described rotary handle is bolted and is fixed on transition axis and puts, the lower end of transition axle sleeve is arranged with connecting bushing, described connecting bushing can slide up and down along transition axle sleeve and rotate around transition axle sleeve；
The outer cover of the closure main shaft between stopper flange and feed mechanism is provided with flange lock sleeve, the upper end of described flange lock sleeve is symmetrically arranged with draw-in groove, connecting bushing is provided with card article with the corresponding position of flange lock sleeve, and described card article is intercalated in described draw-in groove；The lower end of flange lock sleeve is threadedly connected to the upper end of stopper flange, is provided with plastics bulb in the upper end of stopper flange, and the lower end of flange lock sleeve abuts against on described plastics bulb；The inside of described plastics bulb is provided with through hole and is sheathed on the outside of closure main shaft by described through hole, and the inwall of through hole is evenly equipped with some first sealing rings vertically, and the outside of closure main shaft is located at by described first sealing ring sealing shroud；Stopper flange is fixed with the second sealing ring on the inner peripheral surface of plastics bulb corresponding position, and the outside of plastics bulb is located at by described second sealing ring sealing shroud.
Above-mentioned a kind of pipeline device, described hinge-type leather cup block head includes leading truck, closure hinge, leather cup, described leading truck is bolted to connection in the lower end of described closure main shaft, leading truck be symmetrically arranged on two with connecting shaft, one end of described connecting shaft is connected with leading truck, and the other end is connected with described closure hinge, and the bottom of closure hinge offers pore, described pore connects has the second snap joint, described second snap joint to be connected with described flexible pipe；Described leather cup is fixedly connected on the above of closure hinge and fits with closure hinge, and the size of closure hinge is suitable with the size of leather cup；The above of leather cup is fixedly installed gusset assembly and fits with described gusset assembly, gusset assembly includes the first gusset being positioned at leather cup center position and is symmetricly set in the second gusset of the first gusset both sides, and the size of gusset assembly is suitable with the size of leather cup.
Above-mentioned a kind of pipeline device, described closure hinge includes main wing, and the lateral symmetry of main wing is provided with flank, and main wing is connected by bearing pin with flank, closure hinge is connected by two fixed blocks and leather cup are fixing, and two fixed blocks are all individually fixed on two flanks by bolt.
Above-mentioned a kind of pipeline device, described leather cup is provided with the corresponding position of flange, described first gusset and the second gusset and leather cup flange and is equipped with turnover panel, and described turnover panel is fixed on the medial surface of flange.Leather cup is provided with flange can reach better seal effect, and the flange of leather cup can be played the fixing effect supported by arranging of this turnover panel.
The beneficial effects of the utility model are as follows:
This utility model is in use, upstream and downstream position at pipeline to be repaired, first job platform is laid, job platform can be tightly connected with the lateral wall of pipeline to be repaired, opening is offered to lay block head on pipeline to be repaired in job platform confined space, again stopper is arranged on job platform, in block head being arranged on pipeline to be repaired by stopper, carries out pipe plugging.Offer through hole on the block head that this utility model uses and connect the flexible pipe of ventilation, can be easily and reliably to maintenance pipeline release of pressure and pressurization, prevent the turnover of the block head leather cup periphery in stopper from excessively can not form good sealing, the venting channels of stopper is connected with block head, is used for blocking pipe by placing in pipeline under block head.Specifically, when using this utility model, stopper flange is fixed on job platform, stopper flange and job platform are in sealing contact, the lower end of closure main shaft is connected with hinge-type leather cup block head, on hinge-type leather cup block head hose connection closure main shaft lower end snap joint on, breather is connected in the snap joint of closure main shaft upper end, closure main shaft moves up and down in stopper flange, in hinge-type leather cup block head can be placed in pipeline to be repaired, pipeline to be repaired is blocked, gas in pipeline the most to be repaired or liquid etc. all can outwards be discharged by flexible pipe via the passage in closure main shaft and discharge, thus conveniently maintenance；After maintenance is changed, by in closure main shaft passage inversely for inflatable body or liquid in the pipeline that keeped in repair, thus balance the pressure differential of pipeline and the upstream and downstream keeped in repair, remove hinge-type leather cup block head the most again, so can ensure that the safety of construction, simultaneously can also be by the pressure valve on breather, Pressure gauge etc. to keeping in repair the pipeline pressure sealing situation with Measuring error pipeline.Breather line of the present utility model is blocking inside main shaft, and compact conformation more saves space, utilizes flexible pipe and snap joint to be also beneficial to the sealing of breather line, and it is more convenient to operate, and function is more extensive.And snap joint is connected to being screwed block on main shaft and hinge-type leather cup block head, solid and reliable, good airproof performance, snap joint also is able to the instrument that need not and just realizes pipeline connection or disconnect.Hinge-type leather cup block head can make the hinge-type leather cup block head of different size according to different pipe diameters, the hinge-type leather cup block head matched with pipe diameter to be repaired is selected during use, this hinge-type leather cup block head transfers to pipe interior to be repaired, leather cup is made to be adjacent to inner-walls of duct, leather cup has certain elasticity, there is certain compressible amount, this compressible amount can make leather cup be close on pipe wall, it is allowed to the closure to pipeline tightly reliable, all can reach good plugging effect at basic, normal, high pressure condition；Gusset assembly it is further fixed on leather cup, the special tectonic of gusset assembly, leather cup is served certain supporting role, particularly can support yielding leather cup edge, plugging leather cup edge is turned over phenomenon that is many and that can not seal very well to prevent hinge-type leather cup block head from occurring owing to pressure is excessive during upholding；This hinge-type leather cup block head is not stressed restriction, traditional block head under low pressure plugging effect is bad, under high pressure, block head is difficult to again bear the intensity of pressure, and this hinge-type leather cup block head uses closure gusset that leather cup is supported enhancing intensity, and plugging effect is good.
This utility model is additionally provided with feeding structure on closure main shaft, described feeding structure includes connecting bushing, driving sleeve, rotary handle, transition axle sleeve, described driving sleeve be set in closure main shaft on and with described closure main shaft axial restraint, transition axle sleeve is threadeded with driving sleeve, transition axis has put rotary handle, rotary handle is bolted to connection on transition axis overlaps, the quick in-position of closure main shaft can be made by promoting rotary handle, transition axis puts equipped with connecting bushing, connecting bushing can slide up and down or rotate about on transition axis overlaps, transition axle sleeve lower end abuts against on flange lock sleeve, the rotation of operation handle can drive driving sleeve to move up and down, driving sleeve is connected with closure main shaft axial restraint, thus drive the realization that moves up and down of closure main shaft to block, this compact conformation, mobile accurate.
Being provided with plastics bulb in the upper end of stopper flange described in the utility model, plastics bulb inner peripheral surface is fixed with the first sealing ring, and the outside of closure main shaft is located at by described first sealing ring sealing shroud；Stopper flange is fixed with the second sealing ring on the inner peripheral surface of plastics bulb corresponding position; the outside of plastics bulb is located at by described second sealing ring sealing shroud; by arranging of sealing ring, the space between stopper flange and job platform is isolated from the outside; reach better seal effect; prevent gas leak, the safety of protection construction.
Flange lock sleeve also it is arranged with on closure main shaft described in the utility model, flange lock sleeve is between described feeding structure and stopper flange, plastics bulb is had in the middle of flange lock sleeve and stopper flange, pass through rotating operating handle, by driving sleeve, transition axle sleeve and a series of transmissions of connecting bushing, the rotation of connecting bushing can drive flange lock sleeve to rotate, thus extrudes plastics bulb with locking closure main shaft, prevent it from moving axially, thus ensure plugging effect.
Hinge-type leather cup block head is transferred to pipe interior to be repaired by described stopper by this utility model, and described leading truck is bolted to connection in the lower end of described closure main shaft, so stopper can drive leading truck to move.This hinge-type leather cup block head is before putting into pipeline, and the action of the mobile drive connecting shaft of leading truck, and then connecting shaft drives closure hinge to carry out shrinking the action closed up, thus closure hinge makes leather cup in shrinking closed configuration.Block head is transferred in pipeline to shrink the state closed up, the openings of sizes on pipeline can be greatly reduced, after this hinge-type leather cup block head transfers to pipe interior, then opened at pipe interior by the action of leading truck, connecting shaft and closure hinge, make leather cup fit tightly with inner-walls of duct；Closure hinge structure is simple, arranges ingenious, and the action opened by the contraction of self makes whole block head carry out the flexible action opened, and action control is very convenient.Use this hinge-type leather cup block head that pipeline is blocked, it is possible to be greatly reduced the shrinkage area of block head, thus reduce the openings of sizes on pipeline, pipeline is effectively protected, it is also possible to facilitate follow-up sealing.
It is fixed with flexible pipe on hinge-type leather cup block head described in the utility model; closure hinge bottom offers through hole; through hole connects snap joint; flexible pipe lower end is connected with snap joint; upper end is connected to block the snap joint on main shaft, pipeline to be repaired can carry out gas transmission or venting, not only can judge plugging effect and can carry out pressure balance; equipment is played protection operation, improves operational security.
This utility model uses hinge-type leather cup block head to block pipeline; the shrinkage area of block head can be greatly reduced; thus reduce the openings of sizes on pipeline; pipeline is effectively protected; it also is able to facilitate follow-up sealing; set up gusset leather cup edge is effectively supported simultaneously, strengthen crushing resistance, improve sealing effectiveness.
Accompanying drawing explanation
Fig. 1 is gripping orientation structural representation of the present utility model；
Fig. 2 is releasing orientation structural representation of the present utility model；
Fig. 3 is the structure for amplifying schematic diagram of A in Fig. 2；
Fig. 4 is the structural representation of hinge-type leather cup block head in Fig. 2；
Fig. 5 is the structural representation of the connecting bushing in Fig. 2；
Fig. 6 is the structural representation of the flange lock sleeve in Fig. 2；
Fig. 7 is the structural representation of the stopper flange in Fig. 2.
Detailed description of the invention
For making technical purpose of the present utility model, technical scheme and beneficial effect clearer, with specific embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings:
If Fig. 1 is to shown in 7, a kind of pipeline device, including stopper flange 1, the lower end of stopper flange 1 is a flange plate structure, it is fixedly installed on work platforms by this structure, the upper end of stopper flange 1 is that flange arranges and be provided with female thread, is provided with the cavity run through up and down in described stopper flange 1 vertically, is provided with closure main shaft 2 and described closure main shaft 2 can move up and down in cavity in described cavity；Block main shaft 2 is axially inside provided with passage 3, and the top and bottom of described passage 3 are equipped with the first snap joint 4, and described first snap joint 4 is threadedly connected to block on main shaft 2 and is connected with passage 3；The lower end of described closure main shaft 2 is fixedly connected with hinge-type leather cup block head 18, and the upper end of described hinge-type leather cup block head 18 is provided with flexible pipe 20, and described flexible pipe 20 is connected with the first snap joint 4 of passage 3 lower end；nullClosure main shaft 2 is arranged with feed mechanism 6，Described feed mechanism 6 includes driving sleeve 14、Operation handle 7、Transition axle sleeve 16、Spacer 13，Described driving sleeve 14 be sheathed on closure main shaft 2 outside and with closure main shaft 2 axial restraint，Described operation handle 7 is located at the upper end and being bolted of closure main shaft 2 and is fixed on driving sleeve 14，The bottom of driving sleeve 14 is provided with screwed hole vertically，Described spacer 13 is installed in described screwed hole and is sheathed on the outside of closure main shaft 2，Described transition axle sleeve 16 is sheathed on the outside of driving sleeve 14 and threadeds with driving sleeve 14，The upper end of transition axle sleeve 16 is provided with rotary handle 15，Described rotary handle 15 is bolted and is fixed on transition axle sleeve 16，The lower end of transition axle sleeve 16 is arranged with connecting bushing 12，Described connecting bushing 12 can slide up and down along transition axle sleeve 16 and rotate around transition axle sleeve 16；The outer cover of the closure main shaft 2 between stopper flange 1 and feed mechanism 6 is provided with flange lock sleeve 10, in Fig. 1, the upper end of described flange lock sleeve 10 is symmetrically arranged with draw-in groove, and connecting bushing 12 is provided with card article with the corresponding position of flange lock sleeve 10, and described card article is intercalated in described draw-in groove；Flange lock sleeve 10 can relatively rotate with connecting bushing 12, is at gripping orientation both when screwing, and this is also duty of the present utility model, and after pipeline maintenance completes, opposite direction is outwarded winding and is releasing orientation of the present utility model, as shown in Figure 2；The lower end of flange lock sleeve 10 is provided with the external screw thread suitable with the female thread of the upper end of stopper flange 1, thus is threadedly connected to the upper end of stopper flange 1；Feed mechanism 6 is additionally provided with L-type connecting plate 17, the upper end of L-type connecting plate 17 is bolted on flange lock sleeve 10, lower end fastens with the flange of stopper flange 1 upper end, so can make to connect between stopper flange 1 and flange lock sleeve 10 more reliable, also function to spacing effect；Being provided with plastics bulb 8 in the upper end of stopper flange 1, the lower end of flange lock sleeve 10 abuts against on described plastics bulb 8；The inside of described plastics bulb 8 is provided with through hole and is sheathed on the outside of closure main shaft 2 by described through hole, and the inwall of through hole is evenly equipped with some first sealing rings 9 vertically, and the outside of closure main shaft 2 is located at by described first sealing ring 9 sealing shroud；Stopper flange 1 is fixed with the second sealing ring 11 on the inner peripheral surface of plastics bulb 8 corresponding position, and the outside of plastics bulb 8 is located at by described second sealing ring 11 sealing shroud.Described hinge-type leather cup block head 18 includes leading truck 19, closure hinge 21, leather cup 25, described leading truck 19 is bolted to connection in the lower end of described closure main shaft 2, leading truck 19 be symmetrically arranged on two with connecting shaft 22, one end of described connecting shaft 22 is connected with leading truck 19, the other end is connected with described closure hinge 21, closure hinge 21 bottom offers pore 26, pore 26 connects the second snap joint 5, second snap joint 5 is connected with flexible pipe 20, flexible pipe 20 is connected with the first snap joint 4, it is thus connected to block the breather line in main shaft 2, carry out the inflated for deflated of pipeline；Described leather cup 25 is fixedly connected on the above of closure hinge 21 and fits with closure hinge 21, and the size of closure hinge 21 is suitable with the size of leather cup 25；The above of leather cup 25 is fixedly installed gusset assembly and fits with described gusset assembly, gusset assembly includes the first gusset 23 being positioned at leather cup 25 center position and is symmetricly set in the second gusset 24 of the first gusset 23 both sides, first gusset 23 and the second gusset 24 are all connected by some screws are fixing with leather cup 25, and the size of gusset assembly is suitable with the size of leather cup 25.Described leather cup 25 is provided with flange, and the corresponding position of described first gusset 23 and the second gusset 24 and leather cup 25 flange is equipped with turnover panel, and described turnover panel is fixed on the medial surface of flange.Described closure hinge 21 includes main wing 211, the lateral symmetry of main wing 211 is provided with flank 212, main wing 211 is connected by bearing pin with flank 212, and closure hinge 21 is connected by two fixed blocks 213 are fixing with leather cup 25, and two fixed blocks 213 are all individually fixed on two flanks 212 by bolt.Leading truck 19 can drive the contraction of closure hinge 21 to open by the rotation of connecting shaft 22, opens so that whole hinge-type leather cup block head 18 shrinks.
The above, it is only this utility model preferred embodiment, therefore can not limit, with this, the scope that this utility model is implemented, and the equivalence change i.e. made according to this utility model claim and description and modifying, all should still belong in the range of this utility model patent contains.
Claims (4)
1. a pipeline device, it is characterised in that include stopper flange, be provided with the cavity run through up and down in described stopper flange vertically, is provided with closure main shaft in described cavity and described closure main shaft can move up and down in cavity；Block main shaft is axially inside provided with passage, and the top and bottom of described passage are equipped with the first snap joint, and described first snap joint is threadedly connected to block on main shaft and is connected with passage；The lower end of described closure main shaft is fixedly connected with hinge-type leather cup block head, and the upper end of described hinge-type leather cup block head is provided with flexible pipe, and described flexible pipe is connected with the first snap joint of passage lower end；
The outer cover of closure main shaft is provided with feed mechanism, described feed mechanism includes driving sleeve, operation handle, transition axle sleeve and spacer, described driving sleeve be sheathed on closure main shaft outside and with closure main shaft axial restraint, described operation handle is located at the upper end and being bolted of closure main shaft and is fixed on driving sleeve, the bottom of driving sleeve is provided with screwed hole vertically, described spacer is installed in described screwed hole and is sheathed on the outside of closure main shaft, described transition axle sleeve is sheathed on the outside of driving sleeve and threadeds with driving sleeve, the upper end of transition axle sleeve is provided with rotary handle, described rotary handle is bolted and is fixed on transition axis and puts, the lower end of transition axle sleeve is arranged with connecting bushing, described connecting bushing can slide up and down along transition axle sleeve and rotate around transition axle sleeve；
The outer cover of the closure main shaft between stopper flange and feed mechanism is provided with flange lock sleeve, the upper end of described flange lock sleeve is symmetrically arranged with draw-in groove, connecting bushing is provided with card article with the corresponding position of flange lock sleeve, and described card article is intercalated in described draw-in groove；The lower end of flange lock sleeve is threadedly connected to the upper end of stopper flange, is provided with plastics bulb in the upper end of stopper flange, and the lower end of flange lock sleeve abuts against on described plastics bulb；The inside of described plastics bulb is provided with through hole and is sheathed on the outside of closure main shaft by described through hole, and the inwall of through hole is evenly equipped with some first sealing rings vertically, and the outside of closure main shaft is located at by described first sealing ring sealing shroud；Stopper flange is fixed with the second sealing ring on the inner peripheral surface of plastics bulb corresponding position, and the outside of plastics bulb is located at by described second sealing ring sealing shroud.
A kind of pipeline device the most according to claim 1, it is characterized in that, described hinge-type leather cup block head includes leading truck, closure hinge, leather cup, described leading truck is bolted to connection in the lower end of described closure main shaft, leading truck be symmetrically arranged on two with connecting shaft, one end of described connecting shaft is connected with leading truck, the other end is connected with described closure hinge, the bottom of closure hinge offers pore, described pore connects has the second snap joint, described second snap joint to be connected with described flexible pipe；Described leather cup is fixedly connected on the above of closure hinge and fits with closure hinge, and the size of closure hinge is suitable with the size of leather cup；The above of leather cup is fixedly installed gusset assembly and fits with described gusset assembly, gusset assembly includes the first gusset being positioned at leather cup center position and is symmetricly set in the second gusset of the first gusset both sides, and the size of gusset assembly is suitable with the size of leather cup.
A kind of pipeline device the most according to claim 2, it is characterized in that, described closure hinge includes main wing, the lateral symmetry of main wing is provided with flank, main wing is connected by bearing pin with flank, closure hinge is connected by two fixed blocks and leather cup are fixing, and two fixed blocks are all individually fixed on two flanks by bolt.
A kind of pipeline device the most according to claim 2, it is characterised in that described leather cup is provided with the corresponding position of flange, described first gusset and the second gusset and leather cup flange and is equipped with turnover panel, and described turnover panel is fixed on the medial surface of flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620420582.3U CN205640028U (en) | 2016-05-11 | 2016-05-11 | Plugging device for pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620420582.3U CN205640028U (en) | 2016-05-11 | 2016-05-11 | Plugging device for pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205640028U true CN205640028U (en) | 2016-10-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620420582.3U Active CN205640028U (en) | 2016-05-11 | 2016-05-11 | Plugging device for pipeline |
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| CN (1) | CN205640028U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360342A (en) * | 2020-09-28 | 2021-02-12 | 中煤科工开采研究院有限公司 | Quick drilling hole sealing integration drilling rod |
-
2016
- 2016-05-11 CN CN201620420582.3U patent/CN205640028U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360342A (en) * | 2020-09-28 | 2021-02-12 | 中煤科工开采研究院有限公司 | Quick drilling hole sealing integration drilling rod |
| CN112360342B (en) * | 2020-09-28 | 2022-12-20 | 中煤科工开采研究院有限公司 | Quick drilling hole sealing integration drilling rod |
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