CN108869878B - A kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor - Google Patents
A kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor Download PDFInfo
- Publication number
- CN108869878B CN108869878B CN201810688041.2A CN201810688041A CN108869878B CN 108869878 B CN108869878 B CN 108869878B CN 201810688041 A CN201810688041 A CN 201810688041A CN 108869878 B CN108869878 B CN 108869878B
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- Prior art keywords
- long duct
- heap
- top fork
- tail
- hood
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supports For Pipes And Cables (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a kind of screw thread pusher locking mechanisms for long duct anti-oscillating in reactor, including guide pipe, the guide pipe extends outward to form extension towards the end A of long duct in heap, which forms a U-clamp arm to the end A around tieback after long duct in heap；Top fork stick has a forked end, which is inserted into after guide pipe to surround with U-clamp arm and be clamped in heap on long duct outer wall, and another section of stick of top fork is connected with connecting rod, and connecting rod with fixed buildings for connecting；Wherein, the outer diameter of the top fork stick is greater than connecting rod, and one end of top fork stick connection connecting rod forms variable diameter bearing surface, nut is socketed in guiding pipe outer wall, the nut is provided with tail-hood far from one end of long duct in heap, and the tail-hood is provided with through-hole, and connecting rod is inserted into free to slide in the through-hole；As into heap, long duct constantly screws nut, one side of the final tail-hood towards guide pipe is contacted with the extruding of variable diameter bearing surface.
Description
Technical field
The invention belongs to the clampings of nuclear power station internal pipeline, support technology field, and in particular to one kind is for long in reactor
The screw thread pusher locking mechanism of conduit anti-oscillating.
Background technique
In nuclear reactor, it is provided with and largely provides the conduit of guiding and supporting functions with instrument for In-core Instrumentation, this
A little conduits are longer and are in bending state, and generally there is fixation at the both ends of conduit, but due to water impact and heap in reactor
The influence of internal vibration, it is necessary to fixing and limiting structure be set for the intermediate position of these conduits, generalling use the structures such as fixed block will
Conduit blocks, and fixed block is fixed in support tube in a manner of welding or is bolted, but since dimensional tolerance influences, these
Catheter outer diameter value is not exactly the same, generally has certain gap between fixed block and conduit, cause conduit in water impact or
Occur shaking and being prone to wear under the influence of heap internal vibration, and different conduits and the distance between support tube are different, use
The identical fixed block of size is come when fixing all conduits, it is possible to will lead to some conduits and deviate original route.
Summary of the invention
The purpose of the present invention is to provide a kind of screw thread pusher locking mechanisms for long duct anti-oscillating in reactor, originally
Invention devises a kind of thread locking structure and fixes to position among conduit, which screws principle using screw thread,
Realize the clamping to conduit, completely eliminate the gap between locking mechanism and conduit, the structure can with adjustment length, with
Adapt to different the distance between conduit and support tube.
The specific technical proposal of the invention is:
Long duct axis in a kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor, including axis and heap
The vertically disposed guide pipe of line, the one end of the guide pipe towards long duct in heap is the end A, and the end A extends outward to form extension,
The extension forms a U-clamp arm to the end A around tieback after long duct in heap；It further include a top fork stick, stick is pitched on the top
With a forked end, which is inserted into after guide pipe to surround with U-clamp arm and be clamped in heap on long duct outer wall, top fork
Another section of stick is connected with connecting rod, and connecting rod with fixed buildings for connecting；Wherein, the outer diameter of the top fork stick is greater than connection
One end of bar, top fork stick connection connecting rod forms variable diameter bearing surface, further includes nut, nut is socketed in guiding pipe outer wall, institute
It states nut and one end of long duct in heap is provided with tail-hood, the tail-hood is provided with through-hole, and the diameter of the through-hole is less than top fork
Rod outside diameter but be greater than connecting rod outer diameter, connecting rod is inserted into free to slide in the through-hole；As long duct is continuous into heap for nut
It screws, one side of the final tail-hood towards guide pipe is contacted with the extruding of variable diameter bearing surface.
In the present invention, since the present invention is to belong to more special reactor environment, long duct is in high spoke in heap
Region is penetrated, and in water environment, which is movement water environment, and therefore, long duct will receive water impact in heap, therefore
Biggish concussion is often resulted in, and the structure that traditional limit method uses is complex, simultaneously because radiation environment, it can not
Manually mode is operated, and commonly relies on manipulator operation, therefore assembly manipulation gets up the very consuming time, and in the later period
When maintenance, disassembly is also very troublesome.And design principle of the invention is, in advance by guide pipe and heap with U-clamp arm
Interior long duct is assembled together, and wherein U-clamp arm and guide pipe completely surround long duct in heap, and later, the present invention only need to be according to
Rely manipulator to lift integrated top fork stick and connecting rod, top fork stick is inserted into guide pipe, nut is then lifted and is screwed in
On guide pipe, since top fork rod outside diameter is greater than the outer diameter of connecting rod, step variation is caused, that is, forms variable diameter bearing
Face, at this point, tail-hood will be drawn close to the variable diameter bearing surface direction of top fork stick, and squeeze variable diameter bearing surface, thus when being screwed on
Drive the whole long duct direction into heap of top fork stick, connecting rod mobile, until the forked end of top fork stick presses against long duct in heap
On, at this point, top fork stick and U-clamp arm constitute yoke configurations, and due to being that driving top fork stick is mobile, and outside is led in the present invention
It is not moved to pipe, stress is concentrated to tail-hood.In the present invention, due to only needing rotating nuts that the guiding of intermediate top fork stick can be completed
It is mobile, it therefore, operates very easy, can have that manipulator is simple, quickly operation is completed, while pushing up fork stick and U-clamp arm
It is crimped in heap on long duct completely, it is thus eliminated that the gap between hold assembly and long duct, while it is this using screw thread
The mode of cooperation can lock overall length according to the different distance adjusting nut between long duct and support apparatus to adapt to, full
While sufficient conduit fixation requires, conduit is not made to deviate original route.
In addition, the present invention is in the course of the research, it is contemplated that application environment of the invention is more special, water flow category in environment
In dynamic water environment, and in the event of an accident, water flow can change, simultaneously because the above-mentioned method of clamping of the present invention belongs to rigidity
Clamping, then water flow impact pressure can become larger when major accident occurs, and long duct size is generally relatively thin in the heap, big
Under water impact, and due to being intermediate clamping, vibration is still remained in the heap at both ends to middle section between long duct, having can
It can resonate, therefore, if continuing to keep rigid clamping, be likely to so that long duct fracture or serious change in heap
Shape, in order to overcome the above problem, the tail-hood of the invention uses austenitic stainless steel material, with a thickness of 2mm to 3mm.By
Research, it has been found that when General reactions heap works normally, water flow is about 10N to the impact force of long duct in heap, using above-mentioned solid
The mode rigidly clamped is squeezed calmly, substantially prevents the larger vibration of long duct intermediate region in heap, and serious thing is occurring
Therefore when, water flow will increase 40-50N to the impact force of long duct in heap, and when use above-mentioned material and thickness, in the work of the power
Under, can tail-hood be deformed outward, just will increase the contact area of tail-hood and top fork stick at this time, the end face limit by is squeezed
Buckling is interference fit, at this point, limiting using frictional force, top fork stick can be made to be displaced outwardly certain distance at this time, so that
Certain gap is generated between long duct and top fork stick in heap, at this moment can allow in heap long duct under the action of water flow impact pressure
The shake allowed is generated, the energy of impact force is switched into the frictional energy between the mechanical energy and tail-hood and top fork stick of vibration,
It avoids in heap long duct stress excessive and damages.
Preferably, the variable diameter bearing surface is vertical section, and the vertical section is vertical with top fork mandrel line.
Preferably, the variable diameter bearing surface is inclination section, exists between the inclination section and top fork mandrel line and is greater than 0 degree
And the angle less than 90 degree.
In above-mentioned two preferred embodiment, the shape of variable diameter bearing surface is limited, wherein preferred plan is the change
Diameter bearing surface is inclination section, which is equivalent to a transition gradually reduced of top fork stick to connecting tube, due to adopting
With the shape, therefore, tail-hood is all vertically arranged under normal circumstances, at this point, the contact form between tail-hood and inclination section is
Line contact, this way of contact can make stress focus on tail-hood circular-hole internal-wall, and the stress torque of tail-hood is maximum at this time
, it when major accident occurs, is easiest to causing tail-hood into outside deformation, increases deformation extent, tail-hood and top is allowed to pitch stick
Contact area maximizes, and uses vertical section, and the contact form between tail-hood and inclination section is face contact, therefore, tail
Form and the degree for covering deformation are all weaker.
Preferably, one side of the tail-hood towards guide pipe is vertical with top fork mandrel line.
Preferably, exist between one side of the tail-hood towards guide pipe and top fork mandrel line greater than 0 degree and less than 90 degree
Angle.
Likewise, above-mentioned tail-hood is obliquely installed, it is more advantageous to the contact area maximization after tail-hood deformation with top fork stick.
Preferably, the connecting rod is connected through a screw thread mode and is connected with the adjustment ring being fixed in fixed buildings.
Preferably, it is arc groove end face that fork stick in top, which has a forked end,.
Preferably, the top fork stick is provided with L slot, which penetrates into forked end.
Compared with prior art, the present invention having the following advantages and benefits: 1, structure is simple, driving method letter
It is single, when implementing so that mode of operation is easy, and major accident can be coped with, destruction problem of the water flow to long duct.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is structure chart when variable diameter bearing surface of the present invention is obliquely installed.
Fig. 2 is structure chart when variable diameter bearing surface of the present invention is vertically arranged.
Fig. 3 is the structure chart of top fork stick.
Fig. 4 is the structure chart of guide pipe.
In figure, 1, long duct in heap；2, U-clamp arm；3, top fork stick；4, guide pipe；5, nut；6, tail-hood；7, connecting rod；
8, adjustment ring；9, variable diameter bearing surface；10, L slot.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below with reference to embodiment
Further to be described in detail, exemplary embodiment of the invention and its explanation for explaining only the invention, are not intended as to this
The restriction of invention.
Embodiment one
It is as shown in Figure 1 and Figure 2:
Long duct 1 in a kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor, including axis and heap
The vertically disposed guide pipe 4 of axis, the one end of the guide pipe 4 towards long duct 1 in heap is the end A, and the end A, which extends outward to form, prolongs
Extending portion, the extension form a U-clamp arm 2 to the end A around tieback after long duct 1 in heap；It further include a top fork stick 3, institute
Stating top fork stick has a forked end, which, which is inserted into after guide pipe 4 to surround with U-clamp arm 2, is clamped to long duct 1 in heap
On outer wall, another section of stick of top fork is connected with connecting rod 7, and connecting rod 7 with fixed buildings for connecting；Wherein, stick is pitched on the top
Outer diameter be greater than connecting rod 7, it further includes nut 5 that one end of top fork stick connection connecting rod 7, which forms variable diameter bearing surface 9,5 sets of nut
It connects on 4 outer wall of guide pipe, the nut 5 is provided with tail-hood 6 far from one end of long duct 1 in heap, and the tail-hood 6 is provided with logical
Hole, the diameter of the through-hole are less than top fork rod outside diameter but are greater than 7 outer diameter of connecting rod, and connecting rod 7 is inserted into free skating in the through-hole
It is dynamic；As into heap, long duct 1 constantly screws nut 5, one side of the final tail-hood 6 towards guide pipe 4 is squeezed with variable diameter bearing surface 9
Contact.
In the present invention, since the present invention is to belong to more special reactor environment, long duct 1 is in high spoke in heap
Region is penetrated, and in water environment, which is movement water environment, and therefore, long duct 1 will receive water impact in heap, because
This often results in biggish concussion, and the structure that traditional limit method uses is complex, simultaneously because radiation environment, nothing
Manually mode is operated method, commonly relies on manipulator operation, therefore assembly manipulation gets up the very consuming time, and rear
When phase overhauls, disassembly is also very troublesome.And design principle of the invention is: in advance by the guide pipe 4 with U-clamp arm 2
It is assembled together with long duct 1 in heap, wherein U-clamp arm 2 and guide pipe 4 completely surround long duct 1 in heap, later, this hair
Bright need to rely on manipulator and lift integrated top fork stick and connecting rod 7, and top fork stick is inserted into guide pipe 4, is then lifted
Nut 5 is screwed on guide pipe, since top fork rod outside diameter is greater than the outer diameter of connecting rod 7, is caused step variation, that is, is formed
Variable diameter bearing surface 9, at this point, tail-hood 6 will be drawn close to variable diameter bearing surface 9 direction of top fork stick, and squeeze variable diameter when being screwed on
Bearing surface 9 thus drives whole 1 direction of long duct into heap of top fork stick, connecting rod 7 mobile, until the forked end of top fork stick
It presses against in heap on long duct 1, at this point, top fork stick and U-clamp arm 2 constitute yoke configurations, and due to being driving in the present invention
Top fork stick is mobile, and external orientation pipe does not move, and stress is concentrated to tail-hood 6.In the present invention, due to only needing rotating nuts
The guiding movement of intermediate top fork stick is completed, therefore, operates very easy, can there is that manipulator is simple, quickly operation is completed,
Fork stick is pushed up simultaneously and U-clamp arm 2 is crimped on completely in heap on long duct 1, it is thus eliminated that between hold assembly and long duct
Gap, at the same it is this by the way of being threadedly engaged, spiral shell can be adjusted according to the different distance between long duct and support apparatus
Mother's locking overall length adapts to, and while meeting that conduit is fixed to be required, conduit is not made to deviate original route.
In addition, the present invention is in the course of the research, it is contemplated that application environment of the invention is more special, water flow category in environment
In dynamic water environment, and in the event of an accident, water flow can change, simultaneously because the above-mentioned method of clamping of the present invention belongs to rigidity
Clamping, then water flow impact pressure can become larger when major accident occurs, and 1 size of long duct is generally relatively thin in the heap, big
Under water impact, and due to being intermediate clamping, vibration is still remained in the heap at both ends to middle section between long duct 1, is had
It may resonate, therefore, if continuing to keep rigid clamping, be likely to so that long duct (1) fracture or tight in heap
It deforms again, in order to overcome the above problem, the tail-hood 6 of the invention uses austenitic stainless steel material, with a thickness of 2mm to 3mm.
After study, it has been found that when General reactions heap works normally, water flow is about 10N to the impact force of long duct 1 in heap, is used
The mode that above-mentioned fixed press rigidly clamps, substantially prevents the larger vibration of 1 intermediate region of long duct in heap, and is occurring
When major accident, water flow will increase 40-50N to the impact force of long duct 1 in heap, and when use above-mentioned material and thickness, In
Under the action of the power, tail-hood 6 can be made to deform outward, just will increase the contact area of tail-hood 6 and top fork stick at this time, by
End face limit, which squeezes, to be become being interference fitted, at this point, limiting using frictional force, top fork stick can be made to be displaced outwardly centainly at this time
At this moment distance can allow long duct 1 in heap to rush in water flow so that generating certain gap between long duct 1 and top fork stick in heap
Hit under the action of power and generate the shake of permission, by the energy of impact force switch to vibration mechanical energy and tail-hood 6 and top fork stick it
Between frictional energy, avoid in heap 1 stress of long duct excessive and damage.
Embodiment 2:
As shown in Fig. 2, on that basis of example 1, the variable diameter bearing surface 9 is vertical section, the vertical section and top are pitched
Mandrel line is vertical.
Embodiment 3:
As shown in Figure 1, on that basis of example 1, the variable diameter bearing surface 9 is inclination section, the inclination section and top are pitched
Exist between mandrel line and is greater than 0 degree and the angle less than 90 degree.
In 2 scheme of above-described embodiment 1 and embodiment, the shape of variable diameter bearing surface 9 is limited, wherein preferred plan
It is inclination section for the variable diameter bearing surface 9, which is equivalent to top fork stick to a mistake gradually reduced of connecting tube
It crosses, due to using the shape, tail-hood 6 is all vertically arranged under normal circumstances, at this point, between tail-hood 6 and inclination section
Contact form is line contact, and this way of contact can make stress focus on 6 circular-hole internal-wall of tail-hood, at this time tail-hood 6 by
Force square is the largest, and when major accident occurs, is easiest to causing tail-hood into outside deformation, is increased deformation extent, is allowed tail
The contact area of lid 6 and top fork stick maximizes, and uses vertical section, and the contact form between tail-hood 6 and inclination section is
Face contact, therefore, the form and degree of tail-hood deformation are all weaker.
Embodiment 4:
On that basis of example 1, hang down as shown in Fig. 2, mandrel line is pitched on one side of the tail-hood 6 towards guide pipe 4 and top
Directly, the variable diameter bearing surface 9 is vertical section, and the vertical section is vertical with top fork mandrel line.
Embodiment 5:
On that basis of example 1, hang down as shown in Figure 1, mandrel line is pitched on one side of the tail-hood 6 towards guide pipe 4 and top
Directly, as shown in Figure 1, the variable diameter bearing surface 9 is inclination section, exist between the inclination section and top fork mandrel line and be greater than 0 degree
And the angle less than 90 degree.
Embodiment 5:
On that basis of example 1, it is preferred that deposited between one side of the tail-hood 6 towards guide pipe 4 and top fork mandrel line
Angle being greater than 0 degree and less than 90 degree.
Likewise, above-mentioned tail-hood 6 is obliquely installed, it is more advantageous to the contact area after tail-hood 6 deforms with top fork stick and maximizes.
Other are preferred, and the connecting rod 7 is connected through a screw thread mode and is connected with the adjustment being fixed in fixed buildings
Ring 8.
Preferably, it is arc groove end face that fork stick in top, which has a forked end,.
Preferably, the top fork stick is provided with L slot 10, which penetrates into forked end.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor, which is characterized in that including axis and heap
The vertically disposed guide pipe of interior long duct (1) axis (4), the one end of the guide pipe (4) towards long duct in heap (1) is the end A,
The end A extends outward to form extension, and around long duct (1) in heap, tieback forms a U-clamp arm (2) to the end A to the extension afterwards；
It further include top fork stick (3), for the top fork stick with a forked end, which is inserted into guide pipe (4) afterwards and U-clamp
Arm (2), which surrounds, to be clamped on long duct in heap (1) outer wall, and another section of stick of top fork is connected with connecting rod (7), and connecting rod (7) is used for
It is connect with fixed buildings；Wherein, the outer diameter of the top fork stick is greater than connecting rod (7), one end of top fork stick connection connecting rod (7)
It is formed variable diameter bearing surface (9), further includes nut (5), nut (5) is socketed on guide pipe (4) outer wall, and the nut (5) is separate
One end of long duct (1) is provided with tail-hood (6) in heap, and the tail-hood (6) is provided with through-hole, and the diameter of the through-hole is less than top fork stick
Outer diameter but be greater than connecting rod (7) outer diameter, connecting rod (7) is inserted into free to slide in the through-hole；As nut (5) into heap, lead by length
Pipe (1) constantly screws, and squeezes one side of the tail-hood (6) towards guide pipe (4) with variable diameter bearing surface (9) and contacts.
2. a kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor according to claim 1, special
Sign is that the tail-hood (6) uses austenitic stainless steel material, with a thickness of 2mm to 3mm.
3. a kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor according to claim 1, special
Sign is that the variable diameter bearing surface (9) is vertical section, and the vertical section is vertical with top fork mandrel line.
4. a kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor according to claim 1, special
Sign is that the variable diameter bearing surface (9) is inclination section, exists between the inclination section and top fork mandrel line greater than 0 degree and small
In 90 degree of angle.
5. a kind of screw thread pusher lock for long duct anti-oscillating in reactor described in any one of -4 according to claim 1
Locking structure, which is characterized in that one side of the tail-hood (6) towards guide pipe (4) is vertical with top fork mandrel line.
6. a kind of screw thread pusher lock for long duct anti-oscillating in reactor described in any one of -4 according to claim 1
Locking structure, which is characterized in that exist between one side of the tail-hood (6) towards guide pipe (4) and top fork mandrel line and be greater than 0 degree simultaneously
Angle less than 90 degree.
7. a kind of screw thread pusher lock for long duct anti-oscillating in reactor described in any one of -4 according to claim 1
Locking structure, which is characterized in that connecting rod (7) mode of being connected through a screw thread is connected with the adjustment being fixed in fixed buildings
Ring (8).
8. a kind of screw thread pusher lock for long duct anti-oscillating in reactor described in any one of -4 according to claim 1
Locking structure, which is characterized in that it is arc groove end face that top fork stick, which has a forked end,.
9. a kind of screw thread pusher lock for long duct anti-oscillating in reactor described in any one of -4 according to claim 1
Locking structure, which is characterized in that the top fork stick is provided with L slot (10), which penetrates into forked end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810688041.2A CN108869878B (en) | 2018-06-28 | 2018-06-28 | A kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810688041.2A CN108869878B (en) | 2018-06-28 | 2018-06-28 | A kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108869878A CN108869878A (en) | 2018-11-23 |
| CN108869878B true CN108869878B (en) | 2019-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810688041.2A Active CN108869878B (en) | 2018-06-28 | 2018-06-28 | A kind of screw thread pusher locking mechanism for long duct anti-oscillating in reactor |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2085286U (en) * | 1991-03-29 | 1991-09-25 | 马涛 | Monkey wrench |
| US7073755B2 (en) * | 2003-06-30 | 2006-07-11 | Thomas & Betts International, Inc. | Fast screw pipe clamp |
| CN203907022U (en) * | 2014-06-10 | 2014-10-29 | 宁波中安锻造有限公司 | Pipe installation clamp |
| CN204711915U (en) * | 2015-06-11 | 2015-10-21 | 阜康市拓荒者信息科技有限公司 | A kind of movable four square head wrenches |
| CN205065043U (en) * | 2015-09-21 | 2016-03-02 | 沈阳华威电力设备有限公司 | Overhead line equipment |
| CN205781398U (en) * | 2016-05-28 | 2016-12-07 | 江联重工集团股份有限公司 | A kind of water pressure testing device fixing by U bolt |
| CN205978820U (en) * | 2016-06-08 | 2017-02-22 | 中国建筑第八工程局有限公司 | Pipeline hoop driver |
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2018
- 2018-06-28 CN CN201810688041.2A patent/CN108869878B/en active Active
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