CN112444455A - Coarse-pitch embedded sleeve anti-loosening anti-pulling force test device and method - Google Patents
Coarse-pitch embedded sleeve anti-loosening anti-pulling force test device and method Download PDFInfo
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- CN112444455A CN112444455A CN202011248586.5A CN202011248586A CN112444455A CN 112444455 A CN112444455 A CN 112444455A CN 202011248586 A CN202011248586 A CN 202011248586A CN 112444455 A CN112444455 A CN 112444455A
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- 238000000034 method Methods 0.000 title claims abstract description 7
- 241001669679 Eleotris Species 0.000 claims abstract description 15
- 238000010998 test method Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 abstract description 4
- 230000008092 positive effect Effects 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 239000004519 grease Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- General Health & Medical Sciences (AREA)
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a coarse pitch embedded sleeve anti-loosening withdrawal resistance test device and a method, wherein the device comprises a support frame, a hydraulic dynamometer and an anti-loosening core rod, wherein: the support frame comprises a first upright post and a second upright post which are respectively arranged on the sleeper and the track plate, a cross beam is arranged above the first upright post and the second upright post, the first upright post and the second upright post are respectively positioned at two sides of the large-pitch embedded sleeve to be detected, and the cross beam is parallel to a sleeper rail bearing surface; locking plug includes the hob and overlaps the nut, goes up pinion rack and the lower pinion rack of establishing on the hob, wherein: the lower toothed plate and the upper toothed plate are connected and matched through the anti-loosening teeth. Compared with the prior art, the invention has the following positive effects: through the anti loosening structure of the upper toothed plate and the lower toothed plate arranged on the spiral rod, the anti-pulling force experiment of the embedded sleeve of the sleeper and the track plate can ensure that the test core rod and the sleeve keep relatively static, so that the experiment is continued on site, and the spiral rod can not rotate to loosen and retreat to cause the experiment to be incapable of being carried out.
Description
Technical Field
The invention relates to a coarse pitch embedded sleeve anti-loose withdrawal resistance test device, in particular to an anti-loose withdrawal device in a test process and a test method.
Background
The conventional embedded casing test method adopts a device shown in fig. 1, and comprises the following steps: the device comprises a sleeper 1, a to-be-tested embedded sleeve 2, a support frame 3, a core rod 4, a hydraulic dynamometer 5 and the like, wherein the hydraulic dynamometer 5 generates upward ejection force, the upward ejection force is transmitted to the core rod 4 through a gasket and a nut, and then the core rod 4 acts on the to-be-tested embedded sleeve 2. Because the screw pitch of the core rod 4 and the pre-buried sleeve 2 to be tested is large, the helix angle is large, the generated reverse loosening component force is large, when the combined surface of the pre-buried sleeve 2 to be tested and the core rod 4 is not rough enough, or grease is filled in the pre-buried sleeve 2 to be tested (oil is filled according to requirements), the friction force of the grease is not enough to overcome the loosening component force, the core rod 4 rotates reversely, and in addition, the piston of the hydraulic dynamometer 5 can freely rotate along the axial direction, the friction force is extremely small and is not enough to overcome the reverse loosening component force of the core rod 4, the core rod 4 continuously rotates reversely, and the test.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a coarse pitch embedded sleeve anti-loose type pulling resistance test device and method.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a locking type withdrawal resistance test device of coarse pitch embedded bushing, includes support frame, hydraulic dynamometer and locking plug, wherein: the support frame comprises a first upright post and a second upright post which are respectively arranged on the sleeper and the track plate, a cross beam is arranged above the first upright post and the second upright post, the first upright post and the second upright post are respectively positioned at two sides of the large-pitch embedded sleeve to be detected, and the cross beam is parallel to a sleeper rail bearing surface; locking plug includes the hob and overlaps the nut, goes up pinion rack and the lower pinion rack of establishing on the hob, wherein: the lower toothed plate and the upper toothed plate are connected and matched through the anti-loosening teeth.
The invention also provides a large-pitch embedded sleeve anti-loosening withdrawal resistance test method, which comprises the following steps:
step one, screwing a spiral rod into a coarse-pitch embedded sleeve;
step two, wearing the lower toothed plate, the upper toothed plate and the pressing plate on the spiral rod in sequence to enable the anti-skid teeth of the lower toothed plate to be downward, the upper toothed plate to be meshed with the coarse teeth of the lower toothed plate, and the small end section of the pressing plate hole to be upward;
thirdly, screwing a nut into the fine thread part at the upper end of the spiral rod and screwing the nut tightly, so that the anti-skid teeth of the lower toothed plate are embedded into the end face of the large-pitch embedded sleeve;
placing a first upright column and a second upright column at two ends of the large-pitch embedded sleeve, then enabling a beam hole to penetrate through the spiral rod, and respectively placing two ends of the beam on the first upright column and the second upright column to ensure that the beam is parallel to a rail bearing surface;
step five, enabling the spiral rod to penetrate through a piston center hole of the hydraulic dynamometer, and placing the hydraulic dynamometer on the cross beam;
step six, starting the hydraulic dynamometer to pressurize to a specified pressure or pulling resistance, and keeping for a specified time;
and step seven, dismounting the hydraulic dynamometer and the support, releasing the nut counterclockwise, taking out the pressing plate, the upper toothed plate and the lower toothed plate, and screwing out the spiral rod counterclockwise to finish the test.
Compared with the prior art, the invention has the following positive effects:
through the anti-loosening structure of the upper toothed plate and the lower toothed plate arranged on the spiral rod, the test core rod and the sleeve can be guaranteed to keep relatively static in the anti-pulling force test of the embedded sleeve of the sleeper and the track plate, so that the test can be continuously carried out on site. After the spiral rod is pulled in the test process, the counterclockwise component force of the spiral rod is offset by the clockwise component force of the lower toothed plate on the upper toothed plate, and the phenomenon that the spiral rod rotates and loosens to cause the test to be impossible is avoided.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a conventional pullout resistance test apparatus;
FIG. 2 is a schematic view of the stand of the present invention;
FIG. 3 is a schematic view of the anti-loosening mandrel of the present invention;
FIG. 4 is a schematic view of the installation of a screw rod;
FIG. 5 is a schematic view of the installation check member;
FIG. 6 is a schematic view of the lead angle of the helical rod;
figure 7 is a schematic view of the helix angles of the upper and lower tooth plates;
fig. 8 is a schematic view of the lower toothed plate anti-loose teeth embedded in the embedded sleeves;
FIG. 9 is a hexagonal mating view of the upper tooth plate and the helical rod;
FIG. 10 is a schematic view of hexagonal threading of a helical rod through a lower tooth plate aperture;
FIG. 11 is a schematic view of the installation of the screw rods and the support bracket;
FIG. 12 is a schematic structural view of the present invention;
the reference numerals include: the device comprises a sleeper 1, a to-be-tested embedded sleeve 2, a support frame 3, a core rod 4, a hydraulic dynamometer 5 and a locking core rod 6; a gasket 31, a first upright column 32, a cross beam 33 and a second upright column 34; lower toothed plate 61, nut 62, screw rod 63, pressure plate 64, upper toothed plate 65.
Detailed Description
A coarse pitch embedded sleeve anti-loose type pulling resistance test device is shown in figure 12 and comprises: the device comprises a sleeper 1, a to-be-tested embedded sleeve 2, a support frame 3, a hydraulic dynamometer 5 and a locking core rod 6.
The structure of the supporting frame 3 is shown in fig. 2, and comprises: the device comprises a gasket 31, a first upright column 32, a cross beam 33 and a second upright column 34, wherein the first upright column 32 and the second upright column 34 are arranged on a sleeper or a track plate and positioned at two sides of a measured coarse pitch embedded sleeve 2, the cross beam 33 is arranged above the first upright column 32 and the second upright column 34, and the cross beam 33 can rotate around the first upright column 32 properly and is adjusted to be parallel to a rail bearing surface of the sleeper 1 through the gasket 31.
The structure of the anti-loosening core rod 6 is shown in fig. 3, and comprises: lower toothed plate 61, nut 62, spiral rod 63, clamp plate 64, go up toothed plate 65, wherein: the lower toothed plate 61 and the upper toothed plate 65 are connected and matched through the anti-loosening teeth, and the center of the upper toothed plate 65 is matched with the hexagonal part of the hexagonal inner hole and the spiral rod 63, can only slide up and down and cannot rotate mutually. The lower end of the lower toothed plate 61 is provided with anti-skid teeth which are embedded into the upper end surface of the measured embedded sleeve 2 under the action of axial force and cannot rotate mutually. The nut 62 is tightened and the clamping force is transmitted through the pressure plate 64 and the upper toothed plate 65 to the lower toothed plate 61.
A tooth-type helix angle γ (shown in fig. 7) of a connection portion of the lower toothed plate 61 and the upper toothed plate 65 is greater than a helix angle β (shown in fig. 6) of a measured casing thread, when a force is applied to the helical rod 63 to generate a component force of counterclockwise rotation loosening, the helical rod 63 drives the upper toothed plate 65 to rotate counterclockwise, but since the mating helix angle γ of the upper toothed plate 65 and the lower toothed plate 61 is greater than the helix angle β of the helical rod 63 in mating with the casing 2, and an inner hole of the lower toothed plate 61 is greater than a hexagonal shape of the helical rod (shown in fig. 10), the lower toothed plate 61 cannot rotate with the helical rod 63, and if the upper toothed plate 65 slightly rotates under the rotation of the helical rod 63, the lower toothed plate 61 cannot rotate, so that the pressure of the upper toothed plate 65 on the lower toothed plate 61 is increased, and the anti-slip teeth at the lower end of the lower toothed plate 61 are embedded and deepened in the casing (shown in fig. 8), thereby effectively blocking the rotation of the lower toothed plate 61, and the component force in a clockwise direction is generated, the upper toothed plate 65 cannot rotate, the upper toothed plate 65 and the spiral rod 63 are connected by a hexagonal sliding key (as shown in fig. 9), the spiral rod 63 cannot rotate, and the experiment is continued.
The invention also provides a large-pitch embedded sleeve anti-loosening withdrawal resistance test method, which comprises the following steps:
1) according to the figure 4, firstly screwing the spiral rod 63 into the large-pitch embedded sleeve 2 of the sleeper or the track plate 1, wherein the screwing depth is the design depth required by the test;
2) according to the figure 5, the lower toothed plate 61, the upper toothed plate 65 and the pressing plate 64 are sequentially worn on the spiral rod 63, so that the anti-skid teeth of the lower toothed plate 61 are downward, the coarse teeth (anti-loose teeth) are upward, the teeth of the upper toothed plate 65 are downward, the upper toothed plate 65 is meshed with the coarse teeth of the lower toothed plate 61, and the small end section of the pressing plate hole is upward;
3) according to the figure 3, the nut 62 is screwed into the fine thread part at the upper end of the spiral rod 63 and is screwed tightly, so that the anti-skid teeth of the lower toothed plate 61 are embedded into the end surface of the large-pitch embedded sleeve 2;
4) placing a first upright column 32 and a second upright column 34 at two ends of a large-pitch embedded sleeve on a sleeper or a track plate according to the graph of FIG. 11, then enabling a cross beam 33 to penetrate through a spiral rod 63, placing the cross beam 33 on the first upright column 32 and the second upright column 34 to enable the cross beam 33 to be parallel to a track bearing surface, and filling a gasket 31 with proper thickness below the first upright column 32 according to adjustment requirements;
5) according to fig. 12, a screw rod 63 is inserted through the central hole of the piston of the hydraulic dynamometer 5, and the hydraulic dynamometer 5 is placed on the cross beam 33;
6) the hydraulic dynamometer 5 is activated to be pressurized to a prescribed pressure or withdrawal force and is maintained for a prescribed time.
7) The hydraulic dynamometer 5 and the support 3 are removed. And (3) releasing the nut 62 counterclockwise, taking out the pressing plate 64, the upper toothed plate 65 and the lower toothed plate 61, and screwing out the spiral rod 63 counterclockwise, so that the test is completed.
The working principle of the invention is as follows:
after the nut 62 on the experimental spiral rod 63 is screwed down, the generated axial force is transmitted to the lower toothed plate 61 through the pressing plate 64 and the upper toothed plate 65, the lower end of the lower toothed plate 61 is of a fine tooth structure, the end face of the embedded sleeve 2 can be embedded under the action of the axial force, and the lower toothed plate 61 can not rotate any more at the moment. After the lower toothed plate 61 is fixed, the spiral rod 63 and the upper toothed plate 65 are connected through a hexagonal sliding key and cannot rotate. If the reverse loosening trend of the spiral rod 63 appears, the upper toothed plate 65 is driven to rotate reversely, and because the spiral rising angle gamma of the upper toothed plate 65 and the lower toothed plate 61 is larger than the spiral rising angle beta of the spiral rod 63 and the pre-buried sleeve 2 to be measured, the downward pressing trend of the upper toothed plate 65 to the lower toothed plate 61 is generated, so that the embedding pressure of the lower toothed plate 61 to the pre-buried sleeve is increased, and the lower toothed plate 61 and the pre-buried sleeve 2 are fixed more firmly.
Claims (10)
1. The utility model provides a locking type withdrawal resistance test device of coarse pitch embedded bushing which characterized in that: including support frame, hydraulic dynamometer and locking plug, wherein: the support frame comprises a first upright post and a second upright post which are respectively arranged on the sleeper and the track plate, a cross beam is arranged above the first upright post and the second upright post, the first upright post and the second upright post are respectively positioned at two sides of the large-pitch embedded sleeve to be detected, and the cross beam is parallel to a sleeper rail bearing surface; locking plug includes the hob and overlaps the nut, goes up pinion rack and the lower pinion rack of establishing on the hob, wherein: the lower toothed plate and the upper toothed plate are connected and matched through the anti-loosening teeth.
2. The coarse pitch embedded sleeve anti-loose type pulling resistance test device according to claim 1, characterized in that: the helix angle of the tooth shape of the connecting part of the lower toothed plate and the upper toothed plate is larger than that of the measured casing thread.
3. The coarse pitch embedded sleeve anti-loose type pulling resistance test device according to claim 1, characterized in that: the inner hole of the lower toothed plate is larger than the hexagonal shape of the spiral rod; the upper toothed plate is connected with the spiral rod through a hexagonal sliding key.
4. The coarse pitch embedded sleeve anti-loose type pulling resistance test device according to claim 1, characterized in that: the lower end of the lower toothed plate is provided with anti-skid teeth.
5. The coarse pitch embedded sleeve anti-loose type pulling resistance test device according to claim 1, characterized in that: and a pressure plate is arranged between the nut on the spiral rod and the upper toothed plate.
6. The coarse pitch embedded sleeve anti-loose type pulling resistance test device according to claim 5, characterized in that: the pressing plate hole is divided into a small end section and a large end section, wherein the large end section faces downwards, and the size of the large end hole is larger than the size of a hexagonal diagonal of the spiral rod.
7. The coarse pitch embedded sleeve anti-loose type pulling resistance test device according to claim 1, characterized in that: and a gasket is arranged below the first upright post.
8. The coarse pitch embedded sleeve anti-loose type pulling resistance test device according to claim 1, characterized in that: the cross beam is rotatable about the first upright.
9. A coarse pitch embedded sleeve anti-loosening withdrawal resistance test method is characterized by comprising the following steps: the method comprises the following steps:
step one, screwing a spiral rod into a coarse-pitch embedded sleeve;
step two, sequentially matching the lower toothed plate, the upper toothed plate and the pressing plate on the spiral rod, enabling the anti-skid teeth of the lower toothed plate to be downward, enabling the upper toothed plate to be meshed with the coarse teeth of the lower toothed plate, and enabling the small end section of the pressing plate to be upward;
thirdly, screwing a nut into the fine thread part at the upper end of the spiral rod and screwing the nut tightly, so that the anti-skid teeth of the lower toothed plate are embedded into the end face of the large-pitch embedded sleeve;
placing a first upright column and a second upright column at two ends of the large-pitch embedded sleeve, then enabling a beam hole to penetrate through the spiral rod, and respectively placing two ends of the beam on the first upright column and the second upright column to ensure that the beam is parallel to a rail bearing surface;
fifthly, enabling the spiral rod to penetrate through a piston through hole of the hydraulic dynamometer, and placing the hydraulic dynamometer on the cross beam;
step six, starting the hydraulic dynamometer to pressurize to a specified pressure or pulling resistance, and keeping for a specified time;
and step seven, dismounting the hydraulic dynamometer and the support, releasing the nut counterclockwise, taking out the pressing plate, the upper toothed plate and the lower toothed plate, and screwing out the spiral rod counterclockwise to finish the test.
10. The coarse pitch embedded sleeve anti-loosening anti-pulling force test method according to claim 9, characterized in that: the cross beam is ensured to be parallel to the rail bearing surface by arranging gaskets with different thicknesses below the first upright post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011248586.5A CN112444455A (en) | 2020-11-10 | 2020-11-10 | Coarse-pitch embedded sleeve anti-loosening anti-pulling force test device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011248586.5A CN112444455A (en) | 2020-11-10 | 2020-11-10 | Coarse-pitch embedded sleeve anti-loosening anti-pulling force test device and method |
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| CN112444455A true CN112444455A (en) | 2021-03-05 |
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| CN202011248586.5A Pending CN112444455A (en) | 2020-11-10 | 2020-11-10 | Coarse-pitch embedded sleeve anti-loosening anti-pulling force test device and method |
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| JP2001003700A (en) * | 1999-06-21 | 2001-01-09 | Front Engineering Kk | Device and method for testing bar steel member for withdrawing resistance |
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| KR200348952Y1 (en) * | 2004-01-08 | 2004-04-30 | 한라건설주식회사 | Portable Pullout Tester of Fiber Reinforced Plastic Pipe |
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| CN209875676U (en) * | 2019-05-05 | 2019-12-31 | 陈建军 | Bolt self-locking anti-loosening structure |
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| CN211825421U (en) * | 2020-01-14 | 2020-10-30 | 中铁十一局集团桥梁有限公司 | Anti-pulling detection device |
| CN211852449U (en) * | 2020-03-23 | 2020-11-03 | 刘兴丹 | Annular column check bolt fastener |
| CN214066888U (en) * | 2020-11-10 | 2021-08-27 | 中铁隆昌铁路器材有限公司 | Coarse pitch embedded sleeve anti-loosening anti-pulling force test device |
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2020
- 2020-11-10 CN CN202011248586.5A patent/CN112444455A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001003700A (en) * | 1999-06-21 | 2001-01-09 | Front Engineering Kk | Device and method for testing bar steel member for withdrawing resistance |
| US20020144556A1 (en) * | 2001-04-06 | 2002-10-10 | Kenji Hasegawa | Instrument and method for measuring pluck resistance of fastener members |
| JP2004278254A (en) * | 2003-03-19 | 2004-10-07 | Nisshin Steel Co Ltd | Pulling resistance testing device for lock bolt |
| KR200348952Y1 (en) * | 2004-01-08 | 2004-04-30 | 한라건설주식회사 | Portable Pullout Tester of Fiber Reinforced Plastic Pipe |
| CN2720177Y (en) * | 2004-08-17 | 2005-08-24 | 黄林海 | Anti-loosing device for nut |
| CN203700882U (en) * | 2013-12-30 | 2014-07-09 | 太仓中博铁路紧固件有限公司 | Rail gusset plate fastener with anti-loose structure |
| CN203926321U (en) * | 2014-05-29 | 2014-11-05 | 陈舒光 | A kind of securing means of the anti-Anti-theft-dismounting that relaxes |
| CN204175767U (en) * | 2014-10-20 | 2015-02-25 | 浙江荣得利航空部件有限公司 | Dual anti-loosing nut external member |
| CN204985270U (en) * | 2015-08-04 | 2016-01-20 | 申书达 | Detachable check bolt or screw subassembly |
| CN205688282U (en) * | 2016-06-02 | 2016-11-16 | 刘兴丹 | A kind of sleeper check bolt |
| CN206234234U (en) * | 2016-09-10 | 2017-06-09 | 王一婷 | A kind of sleeve pipe check bolt |
| CN207485832U (en) * | 2017-09-21 | 2018-06-12 | 孙愉后 | Fastener |
| CN209875676U (en) * | 2019-05-05 | 2019-12-31 | 陈建军 | Bolt self-locking anti-loosening structure |
| CN211449343U (en) * | 2019-12-31 | 2020-09-08 | 北京洋生科技有限公司 | Tooth-shaped locknut assembly |
| CN211825421U (en) * | 2020-01-14 | 2020-10-30 | 中铁十一局集团桥梁有限公司 | Anti-pulling detection device |
| CN211852449U (en) * | 2020-03-23 | 2020-11-03 | 刘兴丹 | Annular column check bolt fastener |
| CN214066888U (en) * | 2020-11-10 | 2021-08-27 | 中铁隆昌铁路器材有限公司 | Coarse pitch embedded sleeve anti-loosening anti-pulling force test device |
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