CN102373750B - Locking device - Google Patents
Locking device Download PDFInfo
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- CN102373750B CN102373750B CN2011103658866A CN201110365886A CN102373750B CN 102373750 B CN102373750 B CN 102373750B CN 2011103658866 A CN2011103658866 A CN 2011103658866A CN 201110365886 A CN201110365886 A CN 201110365886A CN 102373750 B CN102373750 B CN 102373750B
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- fork plate
- sleeve
- guardrail
- cylinder
- lock according
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- 238000010168 coupling process Methods 0.000 claims description 20
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- 230000001939 inductive effect Effects 0.000 claims description 9
- 239000000126 substance Substances 0.000 abstract 2
- 238000000034 method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 230000033001 locomotion Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The invention provides a locking device, which is used for fixing a digger which is provided with a connecting rod. The locking device comprises a fork plate which is connected with a power device through a connecting assembly. The fork plate is provided with a through groove, and the power device drives the through groove of the fork plate to move to fasten the connecting rod and release the fastening of the connecting rod. By means of the locking device provided by the invention, the digger can be locked and prevented from rotation, silting substances inside the digger is then discharged, and thus, the slitting substances inside the digger can be further prevented from splashing everywhere and can be discharged more thoroughly.
Description
Technical field
The present invention relates to underground blow-off line machines for mud clearage field, especially, relate to a kind of be used to locking the lock of excavating device.
Background technology
At present, the underground blow-off line in city mainly utilizes dredging vehicle to carry out the blowdown processing, and its main working method is to adopt the excavating device of dredging vehicle will silt thing up from underground blow-off line, drawing out.The two ends of excavating device are connected with respectively wire rope, and two wire rope extend respectively well head, and then are connected to the first hydraulic wireline winch and second hydraulic wireline winch of dredging vehicle.By controlling the first hydraulic wireline winch and the second hydraulic wireline winch, thereby make two wire rope drag excavating device and dig the work of drawing in underground blow-off line, after silting thing up and entering in excavating device, the second hydraulic wireline winch and then excavating device is pulled out in underground blow-off line.Dredging vehicle is unloaded to the thing that silts up in excavating device in tipping lorry again.
By silting up during thing is unloaded to the process in tipping lorry in excavating device, the wire rope of the second hydraulic wireline winch is hung in excavating device in the air at dredging vehicle.The excavating device that is played aloft is not fixed, and excavating device easily rocks and rotates, and makes from the thing that silts up that flows out in excavating device and splashes everywhere, affects hygienic conditions; Simultaneously, it is not thorough that the excavating device that rocks silts in the process of thing unloading up in unloading.
Summary of the invention
The object of the invention is to provide a kind of lock, to solve the excavating device that is played, aloft is not fixed, and causes silting up thing and splashes everywhere and silt the halfway technical problem of thing unloading up.
For achieving the above object, according to an aspect of the present invention, provide a kind of lock, be used to fixing an excavating device, excavating device is provided with a connecting rod, and lock comprises the fork plate, and the fork plate is connected in power set through a coupling assembling; The fork plate is provided with a groove, and the opening of groove is towards connecting rod, and the groove that power set drive the fork plate moves to the fixing that fixes connecting rod or disengaging and connecting rod.
Further, lock also comprises a supporting seat, and the fork plate is mounted slidably on supporting seat.
Further, supporting seat also is provided with second through hole that communicates with groove; Lock also comprises a compressing member, and compressing member comprises a sleeve, and the first end of sleeve is with an end wall, and end wall is provided with third through-hole, and the second end of sleeve is fixed in the second through hole of supporting seat; The sidewall of sleeve offers a breach, and the fork plate operationally passes breach.
Further, compressing member also comprises the movable cylinder that two ends connect, and movable cylinder is placed in sleeve actively.
Further, compressing member also comprises one first elasticity thing, and the first elasticity thing is arranged in sleeve, and the two ends of the first elasticity thing compress respectively the inwall of the end wall of the outer wall of movable cylinder and sleeve.
Further, in movable cylinder, be fixedly installed the first cylinder, in the third through-hole of end wall, be fixedly installed the second cylinder, be nested with the first cylinder and the second cylinder inner and outer movable, the first elasticity thing is placed on the periphery of the first cylinder and the second cylinder actively.
Further, the sidewall of movable cylinder is fixedly installed an inductive rod, and the position that the sidewall of sleeve is relative with breach offers a spacing hole; Inductive rod exposes to sleeve after passing the spacing hole of sleeve.
Further, supporting seat is fixedly installed guardrail, and guardrail comprises the first guardrail, second guardrail relative with the first guardrail and connect the first guardrail and the 3rd guardrail of the second guardrail, and the 3rd guardrail is provided with the first through hole; Coupling assembling passes the first through hole, and the two ends of coupling assembling are connected to power set and fork plate.
Further, coupling assembling comprises a cross bar and is connected in the montant of cross bar, and cross bar passes the first through hole and is connected in power set, and montant is fixedly connected on the fork plate.
Further, power set are hydraulic jack.
Further, coupling assembling comprises the sleeve pipe of the telescopic arm that is fixed in cantilever, and the first end of sleeve pipe is fixedly connected on the fork plate, and the second end of sleeve pipe is equipped with telescopic pull bar actively, and the end wall of the second end of sleeve pipe is provided with the backstop thing; The first end of pull bar is fixedly connected on the basic arm of cantilever, and second end that is contained in sleeve pipe of pull bar is provided with limited block.
Further, coupling assembling also comprises drive link, and sleeve pipe is connected in the fork plate through drive link.
Further, coupling assembling also comprises gear box, and gear box is fixedly installed on supporting seat, and drive link is connected in the fork plate after passing gear box.
The present invention has following beneficial effect:
By lock of the present invention, excavating device can be locked, make excavating device not rotate, then unload again the thing that silts up in excavating device, and then making the thing that silts up in excavating device, can not splash and silt up the thing unloading everywhere more thorough.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
The accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining.In the accompanying drawings:
Fig. 1 be in prior art pipeline dredging vehicle for the schematic diagram of pipe-dredging;
Fig. 2 is that the lock of the preferred embodiment of the present invention one is be used to locking the structural representation of excavating device;
Fig. 3 is the supporting seat of the lock of the preferred embodiment of the present invention one, the structural representation of fork plate, coupling assembling and power set;
Fig. 4 is the structural representation of the lock of the preferred embodiment of the present invention one; And
Fig. 5 is the structural representation of the lock of the preferred embodiment of the present invention two.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Referring to Fig. 1, lock of the present invention is installed on pipeline dredging vehicle 1, for the excavating device 3 of fixed-piping dredging vehicle 1, so that the thing that silts up in excavating device 3 is offloaded in the tipping lorry (not shown).Pipeline dredging vehicle 1 is in the process that pipeline 7 is dredged, and excavating device 3 need carry out the work of drawing of digging repeatedly in pipeline 7.Particularly, the dodge gate of excavating device 3 is connected in the first steel cable 2, the first steel cables 2 and then is connected in the first hydraulic wireline winch 11 of pipeline dredging vehicle 1; The top of excavating device 3 is connected in the second steel cable 4, the second steel cables 4 and then is connected in the second hydraulic wireline winch 13 of dredging vehicle 1.By controlling the first hydraulic wireline winch 11 and the second hydraulic wireline winch 13, thereby make the first steel cable 2 and the second steel cable 4 drag excavating device 3, in pipeline 7, dig the work of drawing.The excavating device 3 that silts thing up is housed and under the active force of the second hydraulic wireline winch 13, is drawn out well 6, then will silt thing up and be unloaded in tipping lorry.
Embodiment mono-
Please, in conjunction with referring to Fig. 2, at excavating device 3, be drawn out well 6, and while rising to certain altitude, lock 5 of the present invention is excavating device 3 lockings, and then makes excavating device 3 fixing.Excavating device 3 comprises a stack shell 31 and by a connecting rod 33, is connected in the top handle 35 of stack shell 31.It is conical that this top handle 35 is.
Preferably, in the present invention, power set 57 can adopt hydraulic jack.
Please, in conjunction with referring to Fig. 3, pitch plate 53 and comprise second relative with first surface.Fork plate 53 is provided with one and runs through second and the groove 531 that extends towards first surface by second, groove 531 comprises the fixing section that size is less and is funnelform larger-size approach section by fixing outward-dipping formation of section, preferably, the angle of flare of this funnelform approach section is approximately 150 degree.Wherein, approach section is positioned at the free end of fork plate 53.Supporting seat 51 is provided with the second through hole 511 that communicates with the approach section of the groove 531 of pitching plate 53.
Please in conjunction with referring to Fig. 4, lock 5 also comprises a compressing member 59.Particularly, compressing member 59 comprises a sleeve 591.The first end of sleeve 591 is provided with an end wall 592, on end wall 592, is provided with third through-hole 594.The second end of sleeve 591 is axially fixed in the second through hole 511 of supporting seat 51.Preferably, sleeve 591 adopts the mode of welding to be welded in the inwall of the second through hole 511.At this moment, the second through hole 511 of supporting seat 51 axially connects with the third through-hole 594 of the end wall 592 of sleeve 591.
For making fork plate 53 can be pushed in the sleeve 591 of compressing member 59, the position over against fork plate 53 of the sidewall of sleeve 591 has a breach 593.When coupling assembling 55 promoted fork plate 53 to sleeve 591 slip, fork plate 53 entered in sleeve 591 through the breach 593 that sleeve 591 is offered when power set 57.
Preferably, the sidewall of sleeve 591 with breach 593 over against position be provided with a spacing hole 595 that connects.This spacing hole 595 is square, and its to offer direction be axially to arrange along sleeve 591.The interior movable sleeve of compressing member 59 is equipped with the movable cylinder 596 that two ends connect, and movable cylinder 596 comprises a conical cavity 597.The sidewall of movable cylinder 596 is fixedly installed an inductive rod 510.Preferentially, this inductive rod 510 adopts the mode that is threaded to be connected in the screwed hole of the sidewall setting of movable cylinder 596.Inductive rod 510 is passed the spacing hole 595 of sleeve 591, and then is exposed at outside sleeve 591.
Below elaborate locking and the releasing process of 5 pairs of excavating devices 3 of lock of the present embodiment one.
Please, in conjunction with referring to Fig. 2 and Fig. 4, after the second steel cable 4 passes the second cylinder 599, the first cylinder 598 and the movable cylinder 596 in compressing member 59 successively, then be connected on the top handle 35 of excavating device 3.The second steel cable 4 upwards draws high excavating device 3 under the active force of the second hydraulic wireline winch 13.Like this, the top handle 35 of excavating device 3 enters in the conical cavity 597 of movable cylinder 596, until support on the roof of conical cavity 597.At this moment, the second steel cable 4 continuation are past to drawing high, and the movable cylinder 596 of top handle 35 pushing tows is past to moving along sleeve 591, thereby it is past to movement along the second cylinder 599 to drive the first cylinder 598; Movable cylinder 596 compresses the first elasticity things 590 and forces the first elasticity thing 590 to be in compressive state in this process.In the process to motion, inductive rod 510 is past to moving with movable cylinder 596 spacing holes along sleeve 591 595 at activity cylinder 596.When the connecting rod 33 of excavating device 3 is positioned at same level with the funnelform approach section of the groove 531 of fork plate 53, and while mutually aliging, inductive rod 510 touching one inductor (not shown), make inductor send one and touch the control system (not shown) of signal to pipeline dredging vehicle 1.Control system generates the first control instruction according to touching signal, and the first control instruction is sent to a control device (not shown), control device promotes 53 motions of the direction toward excavating device 3 places of fork plate according to the power set 57 that the first control instruction drives lock 5, until fork plate 53 passes the breach 593 of sleeve 591, makes the connecting rod 33 of excavating device 3 be contained in the funnelform approach section of groove 531.In fork plate 53 is turned right the process of passing, thereby because of top handle 35, be placed on can be toward moving right in the conical cavity 597 of movable cylinder 596 for excavating device 3.Because the sidewall of connecting rod 33 is provided with limiting plate, when connecting rod 33 relatively moved toward the fixing section of groove 531, the limiting plate of connecting rod 33 can make excavating device 3 rotations, and then by the excavating device 3 a certain position of setting right.Fork plate 53 continues toward moving right, and makes the connecting rod 33 of excavating device 3 enter in the fixing section that the size of groove 531 is less.At this moment, the fixing section of fork plate 53 fixes connecting rod 33 live, thereby excavating device 3 is fixed, to prevent excavating device 3 rotations.Simultaneously, the elastic force of the first elasticity thing 590 is pressed on top handle 35 and makes excavating device 3 be in the lock state by movable cylinder 596 tops.By after silting thing up and be unloaded in tipping lorry in excavating device 3, control system generates the second control instruction, and the second control instruction is sent to control device when pipeline dredging vehicle 1.Control device will be pitched plate 53 toward pulling back according to the second control instruction driving power device 57, and fork plate 53 breaks away from the connecting rod 33 of excavating device 3, thereby makes excavating device 3 be in released state.The second hydraulic wireline winch 13 is transferred excavating device 3 gradually by the second steel cable 4; Simultaneously, the movable cylinder 596 of the first elasticity thing 590 elastic-restoring force pushing tows in sleeve 591 moves downward and resets.
In other embodiment of the present embodiment one, lock 5 also can not arrange compressing member 59, by manually operated method, controls locking and the release of excavating device 3.
Embodiment bis-
The lock 5 of the present embodiment two is coupling assembling 55 with the difference of the lock 5 of embodiment mono-.Refer to Fig. 5, coupling assembling 55 comprises drive link 552, gear box 554 and sleeve pipe 555.Wherein, gear box 554 is fixed on supporting seat 51, and gear box 554 comprises the first side and second side relative with the first side.The first side is respectively arranged with coaxial fourth hole and fifth hole with the second side, and drive link 552 is placed on gear box 554 after passing successively fourth hole and fifth hole actively.The first end of drive link 552 is fixedly connected on fork plate 53 after exposing to the first side, and the first end of drive link 552 is equipped with the second elasticity thing 550 actively.The two ends of the second elasticity thing 550 compress respectively the first side of gear box 554 and fixed conveyor bar 552 in the wall of the holder of fork plate 53.The second end of drive link 552 is fixedly connected on the first end of sleeve pipe 555.The preferred spring that adopts of the second elasticity thing 550.
Below elaborate locking and the releasing process of 5 pairs of excavating devices 3 of lock of the present embodiment two.
Please refer again to Fig. 5, when the telescopic arm of the suspended wall of pipeline dredging vehicle 1 is turned right while stretching, sleeve pipe 555 is along with the telescopic arm motion of turning right.Because pull bar 557 is fixedly connected with the basic arm of suspended wall, therefore, pull bar 557 can not move, and still, pull bar 557, with sleeve pipe 555, relative motion occurs.When the backstop thing 559 of the second end of sleeve pipe 555 compresses the limited block 558 of the second end of pull bar 557, the operation that continues to turn right of telescopic arm and sleeve pipe 555, at this moment, pull bar 557 is held sleeve pipe 555, sleeve pipe 555 and then pull drive link 552 operation of turning left, drive link 552 pulls the operation of turning left of fork plate 53, thereby makes the second elasticity thing 550 that is placed on drive link 552 compress.After fork plate 53 was turned left operation, excavating device 3 rose, and makes excavating device 3 withstand the compressing member 59 of lock 5.Then, telescopic arm drives sleeve pipe 555 retraction of turning left.In sleeve pipe 555 is turned left the process that bounces back, when the limited block 558 of pull bar 557 relatively moves toward the right of sleeve pipe 555, be that pull bar 557 no longer applies pulling force to sleeve pipe 555, this moment, the second elasticity thing 550 restore to promote the motion of turning right of fork plate 53 because of elastic force, thereby make fork plate 53 that excavating device 3 forks are lived, to prevent excavating device 3 rotations.This is the process of the locking of excavating device 3.
The telescopic arm operation LAP that continues to turn left, then, pipeline dredging vehicle 1 will silt the thing unloading up in excavating device 3.After having unloaded, telescopic arm is together with sleeve pipe 555 operation of again turning right, when the backstop thing 559 of the second end of sleeve pipe 555 compresses the limited block 558 of the second end of pull bar 557, the operation that continues to turn right of telescopic arm and sleeve pipe 555, at this moment, pull bar 557 is held sleeve pipes 555, sleeve pipe 555 and then pull drive link 552 operation of turning left, drive link 552 pulls the operation of turning left of fork plate 53, thereby makes excavating device 3 break away from fixing of fork plates 53.Excavating device 3 is put down by pipeline dredging vehicle 1.This is the process of the release of excavating device 3.
In other embodiment of the present embodiment two, lock 5 also can not arrange compressing member 59, by manually operated method, controls locking and the release of excavating device 3.
In other embodiment of the present embodiment two, also drive link 552 can be set, be fixedly connected on fork plate 53 after directly the first end of sleeve pipe 555 being passed to gear box 554.Part between plate 53 is nested with the second elasticity thing 50 at sleeve pipe 555 and fork again, makes the two ends of the second elasticity thing 550 compress respectively the first side of gear box 554 and fixed sleeving 555 in the wall of the holder of fork plate 53.
To sum up, by lock 5 of the present invention, can make excavating device 3 not rotate excavating device 3 locking, then unload again the thing that silts up in excavating device 3, and then make silting thing up and can not splash and silt up thing everywhere and unload more thorough in excavating device 3.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. a lock (5), be used to fixing an excavating device, described excavating device is provided with a connecting rod, it is characterized in that, and described lock comprises fork plate (53), and described fork plate (53) is connected in power set (57) through a coupling assembling (55); Described fork plate (53) is provided with a groove (531), the opening of described groove (531) is towards described connecting rod, and the described groove (531) that described power set (57) drive described fork plate (53) moves to the fixing that fixes described connecting rod or disengaging and described connecting rod.
2. lock according to claim 1, is characterized in that, described lock also comprises a supporting seat (51), and described fork plate (53) is mounted slidably on described supporting seat (51).
3. lock according to claim 2, is characterized in that, described supporting seat (51) also is provided with second through hole (511) that communicates with described groove (531); Described lock (5) also comprises a compressing member (59), described compressing member (59) comprises a sleeve (591), the first end of described sleeve (591) is with an end wall (592), described end wall (592) is provided with third through-hole (594), and the second end of described sleeve (591) is fixed in described second through hole (511) of described supporting seat (51); The sidewall of described sleeve (591) offers a breach (593), and described fork plate (53) operationally passes described breach (593).
4. lock according to claim 3, is characterized in that, described compressing member (59) also comprises the movable cylinder (596) that two ends connect, and described movable cylinder (596) is placed in described sleeve (591) actively.
5. lock according to claim 4, it is characterized in that, described compressing member (59) also comprises one first elasticity thing (590), described the first elasticity thing (590) is arranged in described sleeve (591), and the two ends of described the first elasticity thing (590) compress respectively the inwall of the described end wall (592) of the outer wall of described movable cylinder (596) and described sleeve (591).
6. lock according to claim 5, it is characterized in that, in described movable cylinder (596), be fixedly installed the first cylinder (598), in the described third through-hole (594) of described end wall (592), be fixedly installed the second cylinder (599), be nested with, described the first elasticity thing (590) is placed on the periphery of described the first cylinder (598) and described the second cylinder (599) actively described the first cylinder (598) and described the second cylinder (599) inner and outer movable.
7. lock according to claim 6, is characterized in that, the sidewall of described movable cylinder (596) is fixedly installed an inductive rod (510), and the position that the sidewall of described sleeve (591) is relative with described breach (593) offers a spacing hole (595); Described inductive rod (510) exposes to described sleeve (591) after passing the described spacing hole (595) of described sleeve (591).
8. lock according to claim 7, it is characterized in that, described supporting seat (51) is fixedly installed guardrail (59), described guardrail (59) comprises the first guardrail, second guardrail relative with described the first guardrail and connects the 3rd guardrail of described the first guardrail and described the second guardrail, and described the 3rd guardrail is provided with the first through hole (591);
Described coupling assembling (55) passes described the first through hole (591), and the two ends of described coupling assembling (55) are connected to described power set (57) and described fork plate (53).
9. lock according to claim 8, it is characterized in that, described coupling assembling (55) comprises a cross bar (551) and is connected in the montant (553) of described cross bar (551), described cross bar (551) passes described the first through hole (591) and is connected in described power set (57), and described montant (553) is fixedly connected on described fork plate (53).
10. lock according to claim 1, is characterized in that, described power set (57) are hydraulic jack.
11. lock according to claim 7, it is characterized in that, described coupling assembling (55) comprises the sleeve pipe (555) of the telescopic arm that is fixed in cantilever, the first end of described sleeve pipe (555) is fixedly connected on described fork plate (53), the second end of described sleeve pipe (555) is equipped with telescopic pull bar (557) actively, and the end wall of described second end of described sleeve pipe (555) is provided with backstop thing (559);
The first end of described pull bar (557) is fixedly connected on the basic arm of described cantilever, and second end that is contained in described sleeve pipe (555) of described pull bar (557) is provided with limited block (558).
12. lock according to claim 11, is characterized in that, described coupling assembling (55) also comprises drive link (552), and described sleeve pipe (555) is connected in described fork plate (53) through described drive link (552).
13. lock according to claim 12 (5), it is characterized in that, described coupling assembling (55) also comprises gear box (554), it is upper that described gear box (554) is fixedly installed in described supporting seat (51), and described drive link (552) is connected in described fork plate (53) after passing described gear box (554).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103658866A CN102373750B (en) | 2011-11-17 | 2011-11-17 | Locking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103658866A CN102373750B (en) | 2011-11-17 | 2011-11-17 | Locking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102373750A CN102373750A (en) | 2012-03-14 |
| CN102373750B true CN102373750B (en) | 2013-11-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103658866A Expired - Fee Related CN102373750B (en) | 2011-11-17 | 2011-11-17 | Locking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102373750B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4228990A (en) * | 1978-10-26 | 1980-10-21 | Steve Horvath | Hydraulic sewer cleaning system |
| CN201046447Y (en) * | 2007-05-22 | 2008-04-16 | 杨远发 | Conduct pipe dredge |
-
2011
- 2011-11-17 CN CN2011103658866A patent/CN102373750B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4228990A (en) * | 1978-10-26 | 1980-10-21 | Steve Horvath | Hydraulic sewer cleaning system |
| CN201046447Y (en) * | 2007-05-22 | 2008-04-16 | 杨远发 | Conduct pipe dredge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102373750A (en) | 2012-03-14 |
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Granted publication date: 20131120 |