CN203479645U - Torsion-resistant test shaft - Google Patents
Torsion-resistant test shaft Download PDFInfo
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- CN203479645U CN203479645U CN201320554638.0U CN201320554638U CN203479645U CN 203479645 U CN203479645 U CN 203479645U CN 201320554638 U CN201320554638 U CN 201320554638U CN 203479645 U CN203479645 U CN 203479645U
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- bushing pipe
- web member
- seal head
- hole
- shaped
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Abstract
The utility model discloses a torsion-resistant test shaft, and relates to the technical field of high-temperature high-pressure environment simulation test devices for oil-gas well underground tools. The torsion-resistant test shaft comprises a high-pressure cylinder body, a screened pipe, a screened pipe connecting element and a screened pipe pressing ring, wherein the high-pressure cylinder body is provided with a pipe-shaped through hole; the screened pipe is arranged in the pipe-shaped through hole of the high-pressure cylinder body, and a clearance is reserved between the screened pipe and the inner wall of the high-pressure cylinder body; the screened pipe connecting element is arranged in the pipe-shaped through hole above the screened pipe; the middle part of the screened pipe connecting element is provided with a cylindrical through hole; the inner surface of the screened pipe connecting element and the outer surface of the screened pipe are fixed peripherally; the outer surface of the screened pipe connecting element and the inner surface of the high-pressure shaft are fixed peripherally. The torsion-resistant test shaft provided by the utility model has the beneficial effects that the screened pipe connecting element structure is arranged between the high-pressure cylinder body and the screened pipe, so that the screened pipe in the high-pressure cylinder body can bear torsion load, the torsion torque of a tested underground workpiece is transmitted to the externally connected loading equipment through the screened pipe, and the tested underground tool torsion load test can be completed.
Description
Technical field
The utility model relates to Oil/gas Well subsurface tool high temperature and high pressure environment simulation test device, and in particular, the utility model relates to a kind of torsion test pit shaft.
Background technology
In order to meet the demand of hydrocarbon resources exploitation research, comprise the development need of unconventional oil gas well completion technique and subsurface tool, the performance of the know-why of relevant brill, well-completing process and brill, completion tool is carried out to indoor detection test and become more and more important.For this reason, build High Temperature High Pressure full scale tests pit shaft, complete measuring mechanical property, the endurancing under high-temperature and high-pressure conditions and the detection of full-scale instrument combination property etc. of all kinds of subsurface tools, for replenishment of process, improvement instrument provide scientific basis.
Oil/gas Well subsurface tool compbined test environmental requirement test unit possesses the ability that upper cavity pressure, lower cavity pressure, center cavity pressure, mechanical pressure, mechanical pulling force and torsional load are provided for subjects, as the simulation test pit shaft that holds subjects, except bearing High Temperature High Pressure and mechanical pressure, also need to bear torsional load.
At present, what simulation test well adopted is the double-decker mode for special high-pressure cylindrical shell or the adaptation different size instrument of specific standard instrument, skin is the manufacture of high voltage bearing carrying thick-walled pipe, what internal layer adopted is that multi-segment structure connects into an internal lining pipe, can change cheaply bushing pipe and reach the object of changing instrument specification under test pit and the bushing pipe part of changing damage; Existing experimental wwll cylinder can not be born torsional load mostly.
Utility model content
The purpose of this utility model is effectively to overcome the deficiency of above-mentioned technology, a kind of torsion test pit shaft that carries torsional load is provided, this torsion test shaft structure is simple, attractive in appearance, and requirement on machining accuracy is relatively low, and not easily realized by the restriction of pit shaft length dimension, technique.
The technical solution of the utility model is achieved in that it comprises
One high pressure cylindrical shell, has a tube-shaped through hole, and this tube-shaped through hole upper end is equipped with upper sealing device, and lower end is provided with lower sealing device;
One bushing pipe, is arranged in the tube-shaped through hole of above-mentioned high pressure cylindrical shell, and leaves gap between described bushing pipe and the inwall of described high pressure cylindrical shell; It is characterized in that: it also includes
One bushing pipe web member, be arranged in the tube-shaped through hole of bushing pipe top, the middle part of this bushing pipe web member has cylindrical hole, and the inside surface of described bushing pipe web member and the outside surface of described bushing pipe are circumferentially fixing, and the inside surface of the outside surface of described bushing pipe web member and described high pressure pit shaft is circumferentially fixing; And
One bushing pipe pressure ring, this bushing pipe pressure ring is threaded connection at tube-shaped through hole top, for bushing pipe web member top is pressed in to tube-shaped through hole inside.
In above-mentioned structure, described upper sealing device comprises seal head and seal head pressure ring, and described upper seal head is arranged in bushing pipe web member, is sealing setting between the outer wall of the bottom of upper seal head and the inwall of bushing pipe web member; After the bottom of described seal head pressure ring is connected with the screw top of described bushing pipe web member, the top, bottom of described upper seal head is pressed in bushing pipe web member.
In above-mentioned structure, in through hole in the middle of described upper seal head, be provided with the twisting tension and compression load bar being tightly connected with upper seal head, and the bottom of this twisting tension and compression load bar is stretched in described bushing pipe, a setting nut is being threaded on the twisting tension and compression load bar of described seal head pressure ring top, seal head pressure ring top has external thread, the depression bar pressure ring that is being threaded on external thread, described twisting tension and compression load bar, through in the through hole at depression bar pressure ring middle part, is arranged on depression bar pressure ring by above-mentioned setting nut inner.
In above-mentioned structure, between the inside surface of the outside surface of described bushing pipe and described bushing pipe web member, be also provided with the second bushing pipe web member, and the outside surface of described the second bushing pipe web member is fixed on the inside surface of described bushing pipe web member, the outside surface of described bushing pipe is fixed on the inside surface of described the second bushing pipe web member, makes the inside surface of above-mentioned bushing pipe web member and the outside surface of described bushing pipe circumferentially fixing.
In above-mentioned structure, described upper sealing device is comprised of upper seal head and seal head pressure ring, and the bottom of upper seal head is arranged in bushing pipe web member, and is sealing setting between the outer wall of the bottom of upper seal head and the inwall of bushing pipe web member; After the bottom of described seal head pressure ring is connected with the screw top of described bushing pipe web member, the top, bottom of described upper seal head is pressed in bushing pipe web member.
In above-mentioned structure, described lower sealing device is comprised of lower seal head and seal head pressure cap, it between the inwall of the lower end of described lower seal head and high pressure cylindrical shell, is sealing setting, described seal head pressure cap is pressed in the described lower seal crown in the tube-shaped through hole of high pressure cylindrical shell after being threaded with described high pressure cylindrical shell lower end.
In above-mentioned structure, the top of described bushing pipe web member is non-circular ring-shaped edge portion, in the tube-shaped through hole of described high pressure cylindrical shell, be provided with the antitorque non-circular structure suitable with non-circular ring-shaped edge portion, the non-circular ring-shaped edge portion of described bushing pipe web member is fastened in antitorque non-circular structure, makes bushing pipe web member and described high pressure cylindrical shell axial restraint.
In above-mentioned structure, upwards be provided with pressurizing port and lower pressurizing port the week of described high pressure cylindrical shell, described bushing pipe web member is provided with the through hole corresponding with upper pressurizing port, after described bushing pipe web member packs in the tube-shaped through hole of high pressure cylindrical shell, described upper pressurizing port is communicated with through hole, and passes into bushing pipe inside; Described lower pressurizing port is communicated in above-mentioned gap.
The beneficial effects of the utility model are: torsion test pit shaft of the present utility model, by bushing pipe connecting-piece structure is set between high pressure cylindrical shell and bushing pipe, make lining pipe in cylindrical shell to bear torsional load, torsional moment on the workpiece of tested down-hole is passed through bushing pipe structure to cylindrical shell, by cylindrical shell, be passed to the outside loading equipemtn connecting again, so, can complete the test of tested subsurface tool torsional load; The utility model is mainly comprised of high pressure cylindrical shell, the bushing pipe that is arranged on high pressure inner barrel, bushing pipe web member and the packoff that is arranged on high pressure cylindrical shell, its structure is comparatively simple, attractive in appearance with respect to existing simulation test pit shaft, requirement on machining accuracy of the present utility model is not high, be not subject to the restriction of pit shaft length dimension, its technique easily realizes.
Accompanying drawing explanation
Fig. 1 is the first embodiment cross section view of the present utility model;
Fig. 2 is the first embodiment exploded perspective view of the present utility model;
Fig. 3 is the second embodiment cross section view of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model will be further described.
Embodiment 1
Shown in Fig. 1, first specific embodiment of a kind of torsion test pit shaft disclosing for the utility model, in the present embodiment, this torsion test pit shaft includes a high pressure cylindrical shell 100, a bushing pipe 200, a bushing pipe web member 300 and a bushing pipe pressure ring 400, on high pressure cylindrical shell 100, there is tube-shaped through hole 1001, and tube-shaped through hole is equipped with packoff in two ends Shang Xia 1001.
Shown in Fig. 2, bushing pipe 200 is arranged in the tube-shaped through hole 1001 of high pressure cylindrical shell 100, between the inwall of bushing pipe 200 and high pressure cylindrical shell 100, leave gap, bushing pipe web member 300 is arranged in the tube-shaped through hole 1001 of bushing pipe top, the middle part of bushing pipe web member 300 has cylindrical hole, the outside surface of the inside surface of bushing pipe web member 300 and bushing pipe 200 is circumferentially fixing, and the inside surface of the outside surface of bushing pipe web member 300 and high pressure pit shaft 100 is circumferentially fixing; Bushing pipe pressure ring 400 is threaded connection at tube-shaped through hole 1001 tops, for bushing pipe web member 300 tops are pressed in to tube-shaped through hole 1001 inside.In the present embodiment, with reference to Fig. 3, the top of bushing pipe web member 300 is non-circular ring-shaped edge portion 3001, in the tube-shaped through hole of high pressure cylindrical shell 100, be provided with the antitorque non-circular structure 1002 suitable with non-circular ring-shaped edge portion 3001, the non-circular ring-shaped edge portion 3002 of bushing pipe web member 300 is fastened in antitorque non-circular structure 1002, makes bushing pipe web member 300 and described high pressure cylindrical shell 100 axial restraints.Upwards be provided with pressurizing port 500 and lower pressurizing port 600 week of high pressure cylindrical shell 100, bushing pipe web member 300 is provided with the through hole corresponding with upper pressurizing port 500, bushing pipe web member 300 pack into the tube-shaped through hole 1001 of high pressure cylindrical shell 100 interior after, described upper pressurizing port 500 is communicated with through hole, and passes into bushing pipe 200 inside; Described lower pressurizing port 600 is communicated in above-mentioned gap.
Above-mentioned packoff is comprised of with the lower sealing device 800 that is positioned at tube-shaped through hole 1001 lower ends the upper sealing device 700 that is positioned at tube-shaped through hole upper end; Wherein, upper sealing device 700 comprises seal head 7001 and seal head pressure ring 7002, and described upper seal head 7001 is arranged in bushing pipe web member 300, is sealing setting between the outer wall of the bottom of upper seal head 7001 and the inwall of bushing pipe web member 300; After the bottom of seal head pressure ring 7002 is connected with the screw top of described bushing pipe web member 300, the top, bottom of described upper seal head 7001 is pressed in bushing pipe web member 300.In through hole in the middle of upper seal head 7001, be provided with the twisting tension and compression load bar 7003 being tightly connected with upper seal head 7001, and the bottom of this twisting tension and compression load bar 7003 is stretched in described bushing pipe 300, a setting nut 7004 is being threaded on the twisting tension and compression load bar 7003 of described seal head pressure ring 7002 tops, seal head pressure ring 7002 tops have external thread, a depression bar pressure ring 7005 is being threaded on external thread, described twisting tension and compression load bar 7003, through in the through hole at depression bar pressure ring 7005 middle parts, is arranged on depression bar pressure ring 7005 inside by above-mentioned setting nut 7004; The lower end of twisting tension and compression load bar 7003 connects tested instrument, in actual mechanical process, because the setting position of tested instrument and bushing pipe 200 is uncertain, therefore can regulate by setting nut 7004 position of twisting tension and compression load bar 7003.Lower sealing device 800 is comprised of lower seal head 8001 and seal head pressure cap 8002, it between the inwall of the lower end of described lower seal head 8001 and high pressure cylindrical shell 100, is sealing setting, after described seal head pressure cap 8002 is threaded with described high pressure cylindrical shell 100 lower ends, described lower seal head 8001 tops are pressed in the tube-shaped through hole 1001 of high pressure cylindrical shell 100.
The utility model subsurface tool high pressure compbined test pit shaft, by bushing pipe web member 300 structures are set between high pressure cylindrical shell 100 and bushing pipe 200, make the bushing pipe 200 in high pressure cylindrical shell 100 can bear torsional load, torsional moment on the workpiece of tested down-hole is passed to high pressure cylindrical shell 100 by bushing pipe 200, by high pressure cylindrical shell 100, be passed to the outside loading equipemtn connecting again, so, can complete the test of tested subsurface tool torsional load.
Embodiment 2
Shown in Fig. 3, second specific embodiment of a kind of torsion test pit shaft disclosing for the utility model, when not needing tested instrument to apply torsional load, can replace with seal head, adopts following structure to hit cardiac pressure.
In the present embodiment, this torsion test pit shaft includes a high pressure cylindrical shell 10, a bushing pipe 20, a bushing pipe web member 30 and a bushing pipe pressure ring 40, have tube-shaped through hole 101, and tube-shaped through hole is equipped with packoff in two ends Shang Xia 101 on high pressure cylindrical shell 10.
With reference to Fig. 3, bushing pipe 20 is arranged in the tube-shaped through hole 101 of high pressure cylindrical shell 10, between the inwall of bushing pipe 20 and high pressure cylindrical shell 10, leave gap, bushing pipe web member 30 is arranged in the tube-shaped through hole 101 of bushing pipe top, the middle part of bushing pipe web member 30 has cylindrical hole, the outside surface of the inside surface of bushing pipe web member 30 and bushing pipe 20 is circumferentially fixing, and in the present embodiment, between the inside surface of the outside surface of bushing pipe 20 and described bushing pipe web member 30, be also provided with the second bushing pipe web member 90, and the outside surface of the second bushing pipe web member 90 is fixed on the inside surface of described bushing pipe web member 30, the outside surface of bushing pipe 20 is fixed on the inside surface of described the second bushing pipe web member 90, by this kind of structure, make the inside surface of above-mentioned bushing pipe web member 30 and the outside surface of described bushing pipe 20 circumferentially fixing, in addition, the inside surface of the outside surface of bushing pipe web member 30 and high pressure pit shaft 10 is circumferentially fixing.Bushing pipe pressure ring 40 is threaded connection at tube-shaped through hole 101 tops, for bushing pipe web member 30 tops are pressed in to tube-shaped through hole 101 inside.In the present embodiment, with reference to Fig. 3, the top of bushing pipe web member 30 is non-circular ring-shaped edge portion, in the tube-shaped through hole of high pressure cylindrical shell 10, be provided with the antitorque non-circular structure suitable with non-circular ring-shaped edge portion, the non-circular ring-shaped edge portion of bushing pipe web member 30 is fastened in antitorque non-circular structure, makes bushing pipe web member 30 and described high pressure cylindrical shell 10 axial restraints.Upwards be provided with pressurizing port 50 and lower pressurizing port 60 week of high pressure cylindrical shell 10, bushing pipe web member 30 is provided with the through hole corresponding with upper pressurizing port 50, bushing pipe web member 30 pack into the tube-shaped through hole 101 of high pressure cylindrical shell 10 interior after, described upper pressurizing port 50 is communicated with through hole, and passes into bushing pipe 20 inside; Described lower pressurizing port 60 is communicated in above-mentioned gap.
Above-mentioned packoff is comprised of with the lower sealing device 80 that is positioned at tube-shaped through hole 101 lower ends the upper sealing device 70 that is positioned at tube-shaped through hole upper end; Wherein, upper sealing device 70 is comprised of with seal head pressure ring 702 upper seal head 701, and the bottom of upper seal head 701 is arranged in bushing pipe web member 30, and is sealing setting between the outer wall of the bottom of upper seal head 701 and the inwall of bushing pipe web member 30; After the bottom of seal head pressure ring 702 is connected with the screw top of described bushing pipe web member 30, the top, bottom of upper seal head 701 is pressed in bushing pipe web member 30.Lower sealing device 80 is comprised of lower seal head 801 and seal head pressure cap 802, it between the inwall of the lower end of lower seal head 801 and high pressure cylindrical shell 10, is sealing setting, after seal head pressure cap 802 is threaded with described high pressure cylindrical shell 10 lower ends, described lower seal head 801 tops are pressed in the tube-shaped through hole 101 of high pressure cylindrical shell 10.By above-mentioned structure, when needs are exerted pressure to bushing pipe 20 inside, fluid media (medium) flows in bushing pipe 20 by upper pressurizing port 50, when needs are exerted pressure to bushing pipe 20 outsides, fluid media (medium) flows in gap by lower pressurizing port 60, the twisting resistance of bushing pipe 20 is passed on high pressure cylindrical shell 10 by bushing pipe web member 30, and is passed to loading equipemtn by high pressure cylindrical shell 10, realizes torsion test.
The utility model is mainly comprised of high pressure cylindrical shell, the bushing pipe that is arranged on high pressure inner barrel, bushing pipe web member and the packoff that is arranged on high pressure cylindrical shell, its structure is comparatively simple, attractive in appearance with respect to existing simulation test pit shaft, requirement on machining accuracy of the present utility model is not high, be not subject to the restriction of pit shaft length dimension, its technique easily realizes.
Described above is only preferred embodiment of the present utility model, and above-mentioned specific embodiment is not to restriction of the present utility model.In technological thought category of the present utility model, can there is various distortion and modification, the retouching that all those of ordinary skill in the art make according to above description, revise or be equal to replacement, all belong to the scope that the utility model is protected.
Claims (8)
1. a torsion test pit shaft, it comprises
One high pressure cylindrical shell, has a tube-shaped through hole, and this tube-shaped through hole upper end is equipped with upper sealing device, and lower end is provided with lower sealing device;
One bushing pipe, is arranged in the tube-shaped through hole of above-mentioned high pressure cylindrical shell, and leaves gap between described bushing pipe and the inwall of described high pressure cylindrical shell; It is characterized in that: it also includes
One bushing pipe web member, be arranged in the tube-shaped through hole of bushing pipe top, the middle part of this bushing pipe web member has cylindrical hole, and the inside surface of described bushing pipe web member and the outside surface of described bushing pipe are circumferentially fixing, and the inside surface of the outside surface of described bushing pipe web member and described high pressure pit shaft is circumferentially fixing; And
One bushing pipe pressure ring, this bushing pipe pressure ring is threaded connection at tube-shaped through hole top, for bushing pipe web member top is pressed in to tube-shaped through hole inside.
2. a kind of torsion test pit shaft according to claim 1, it is characterized in that: described upper sealing device comprises seal head and seal head pressure ring, described upper seal head is arranged in bushing pipe web member, is sealing setting between the outer wall of the bottom of upper seal head and the inwall of bushing pipe web member; After the bottom of described seal head pressure ring is connected with the screw top of described bushing pipe web member, the top, bottom of described upper seal head is pressed in bushing pipe web member.
3. a kind of torsion test pit shaft according to claim 2, it is characterized in that: in the through hole in the middle of described upper seal head, be provided with the twisting tension and compression load bar being tightly connected with upper seal head, and the bottom of this twisting tension and compression load bar is stretched in described bushing pipe, a setting nut is being threaded on the twisting tension and compression load bar of described seal head pressure ring top, seal head pressure ring top has external thread, a depression bar pressure ring is being threaded on external thread, described twisting tension and compression load bar, through in the through hole at depression bar pressure ring middle part, is arranged on depression bar pressure ring by above-mentioned setting nut inner.
4. a kind of torsion test pit shaft according to claim 1, it is characterized in that: between the outside surface of described bushing pipe and the inside surface of described bushing pipe web member, be also provided with the second bushing pipe web member, and the outside surface of described the second bushing pipe web member is fixed on the inside surface of described bushing pipe web member, the outside surface of described bushing pipe is fixed on the inside surface of described the second bushing pipe web member, makes the inside surface of above-mentioned bushing pipe web member and the outside surface of described bushing pipe circumferentially fixing.
5. a kind of torsion test pit shaft according to claim 4, it is characterized in that: described upper sealing device is comprised of upper seal head and seal head pressure ring, the bottom of upper seal head is arranged in bushing pipe web member, and is sealing setting between the outer wall of the bottom of upper seal head and the inwall of bushing pipe web member; After the bottom of described seal head pressure ring is connected with the screw top of described bushing pipe web member, the top, bottom of described upper seal head is pressed in bushing pipe web member.
6. a kind of torsion test pit shaft according to claim 1, it is characterized in that: described lower sealing device is comprised of lower seal head and seal head pressure cap, it between the inwall of the lower end of described lower seal head and high pressure cylindrical shell, is sealing setting, described seal head pressure cap is pressed in the described lower seal crown in the tube-shaped through hole of high pressure cylindrical shell after being threaded with described high pressure cylindrical shell lower end.
7. a kind of torsion test pit shaft according to claim 1, it is characterized in that: the top of described bushing pipe web member is non-circular ring-shaped edge portion, in the tube-shaped through hole of described high pressure cylindrical shell, be provided with the antitorque non-circular structure suitable with non-circular ring-shaped edge portion, the non-circular ring-shaped edge portion of described bushing pipe web member is fastened in antitorque non-circular structure, makes bushing pipe web member and described high pressure cylindrical shell axial restraint.
8. according to a kind of torsion test pit shaft described in claim 1 or 7, it is characterized in that: be upwards provided with pressurizing port and lower pressurizing port the week of described high pressure cylindrical shell, described bushing pipe web member is provided with the through hole corresponding with upper pressurizing port, after described bushing pipe web member packs in the tube-shaped through hole of high pressure cylindrical shell, described upper pressurizing port is communicated with through hole, and passes into bushing pipe inside; Described lower pressurizing port is communicated in above-mentioned gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320554638.0U CN203479645U (en) | 2013-08-30 | 2013-08-30 | Torsion-resistant test shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320554638.0U CN203479645U (en) | 2013-08-30 | 2013-08-30 | Torsion-resistant test shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203479645U true CN203479645U (en) | 2014-03-12 |
Family
ID=50227957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320554638.0U Expired - Lifetime CN203479645U (en) | 2013-08-30 | 2013-08-30 | Torsion-resistant test shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203479645U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105019885A (en) * | 2014-12-23 | 2015-11-04 | 中国石油化工股份有限公司 | Upright pressure compensation type high temperature and high pressure simulation device |
| CN112014221A (en) * | 2020-09-03 | 2020-12-01 | 西南石油大学 | Well drilling traction robot supporting mechanism testing arrangement |
-
2013
- 2013-08-30 CN CN201320554638.0U patent/CN203479645U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105019885A (en) * | 2014-12-23 | 2015-11-04 | 中国石油化工股份有限公司 | Upright pressure compensation type high temperature and high pressure simulation device |
| CN105019885B (en) * | 2014-12-23 | 2017-11-24 | 中国石油化工股份有限公司 | Place formula pressure compensation HTHP analogue means vertically |
| CN112014221A (en) * | 2020-09-03 | 2020-12-01 | 西南石油大学 | Well drilling traction robot supporting mechanism testing arrangement |
| CN112014221B (en) * | 2020-09-03 | 2022-02-15 | 西南石油大学 | Well drilling traction robot supporting mechanism testing arrangement |
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Address after: 518000, West Coast Building, Nanshan District commercial culture center, Shenzhen, Guangdong, 2010 Patentee after: SHENZHEN FST TECHNOLOGY CO.,LTD. Address before: 518000, West Coast Building, Nanshan District commercial culture center, Shenzhen, Guangdong, 2010 Patentee before: SHENZHEN FST DETECTING EQUIPMENT CO.,LTD. |
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| CX01 | Expiry of patent term |
Granted publication date: 20140312 |
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| CX01 | Expiry of patent term |