CN107036797A - The experimental rig of bolt looseness under a kind of measurement action of lateral load - Google Patents

The experimental rig of bolt looseness under a kind of measurement action of lateral load Download PDF

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Publication number
CN107036797A
CN107036797A CN201710388811.7A CN201710388811A CN107036797A CN 107036797 A CN107036797 A CN 107036797A CN 201710388811 A CN201710388811 A CN 201710388811A CN 107036797 A CN107036797 A CN 107036797A
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China
Prior art keywords
grip block
bolt
plate
hole
groove
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Application number
CN201710388811.7A
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Chinese (zh)
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CN107036797B (en
Inventor
张明远
鲁连涛
唐明明
曾东方
张远彬
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Southwest Jiaotong University
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Southwest Jiaotong University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts

Abstract

The invention discloses a kind of experimental rig for measuring bolt looseness under action of lateral load, belong to vibration testing device field, including the first grip block, the second grip block and the pressure sensor being from left to right sequentially connected;The top of first grip block is cylinder, and bottom is surface plate, and the center of surface plate is provided with first through hole;The bottom of second grip block is cylinder, and top is surface plate, and the center of surface plate is provided with the second through hole, and the right side of surface plate is provided with the second circular groove, and the second circular groove, which embeds intrinsic center, has the pressure sensor of through hole.Also include nut outer corner measurement support and encoder, bolt locating ring and anti-attrition pad.The present invention drives the first grip block and the second grip block to move back and forth by hydraulic fatigue machine, by the load transmission of vibration source to experiment bolt and experiment nut, the continuously adjustabe of laterally loading amplitude and frequency is realized, can be to loosening characteristic (clamping force, nut corner), transverse load and the real-time displacement monitoring of bolt.

Description

The experimental rig of bolt looseness under a kind of measurement action of lateral load
Technical field
The present invention relates to vibration testing device field, and in particular to measures bolt looseness under action of lateral load to a kind of Experimental rig.
Background technology
Bolt has easy to assemble, repeatedly used feature, is widely used in the connection of mechanical structure.Sent out in use It is existing, bolt by transverse load (loading direction is perpendicular to the direction of clamping force) long term when, easily loosen, bolt clip Clamp force is gradually reduced or even completely lost, and causes the failure of equipment and instrument, or even serious security incident.Therefore, it is necessary to logical The reason for mode of overtesting is to bolt looseness is studied, and experimental basis is provided for the design of bolt.
At present frequently with action of lateral load under bolt looseness experimental rig be fastener oscillation crosswise testing stand (reference National standard GB/T-10431-2008), the testing stand carries out horizontal loading by the eccentric wheel on motor, changes eccentric The rotating speed of amount and eccentric wheel realizes the adjustment of loading amplitude and frequency.But the testing stand can not realize the company of loading amplitude and frequency It is continuous to change, and load capability is limited, loading frequency is relatively low.In an installation, screw rod is difficult to align bolt with the center line of screw, leads Cause screw rod in stand under load easily to be come in contact with screw, increase bolt stand under load.In addition, nut rotates during bolt looseness, but The measurement of nut corner is not implemented existing testing stand more.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of experimental rig for measuring bolt looseness under action of lateral load, The problem of loading amplitude and frequency continuously change can not be realized by solving existing experimental rig, can be achieved in bolt looseness experiment laterally Load the continuously adjustabe of amplitude and frequency.
In order to solve the above technical problems, the technical solution adopted in the present invention is:
The experimental rig of bolt looseness under a kind of measurement action of lateral load, one end of the first grip block is cylinder, separately One end is surface plate, and the center of surface plate is provided with first through hole;One end of second grip block is cylinder, and the other end is plane Plate, the center of surface plate is provided with the second through hole;The side of the surface plate of second grip block and the surface plate of the first grip block are mutual It is close to, opposite side is connected with pressure sensor;Second through hole and first through hole are concentric, the first grip block and the second grip block Cylinder is concentric.
According to such scheme, in addition to connect into the nut outer corner measurement support and encoder of an entirety.
According to such scheme, the nut outer corner measurement support include the first L-type beam and the second L-type beam, the first L-type beam and Second L-type beam connects into " Contraband " font beam;First L-type beam is connected by bolt with straight beam, and the second L-type beam is connected to fixed flat Plate, fixed flat planar is fixedly connected with encoder, and the center of fixed flat planar is provided with through hole;The rotary shaft of encoder passes through fixed flat planar Threaded sleeve is fixedly connected with the top of the through hole at center, rotary shaft, the center of threaded sleeve is provided with to match with experiment bolt Screw thread.
According to such scheme, side of the surface plate away from the second grip block of first grip block is positioned provided with bolt Ring, the center of the bolt locating ring is provided with the bolt head shapes identical regular hexagon with testing bolt.
According to such scheme, the bolt locating ring is by the left semi-ring for being symmetrical arranged and being bolted and right half ring group Into left semi-ring and right semi-ring are respectively equipped with parallel cuts.
According to such scheme, in addition to anti-attrition pad;The surface plate of first grip block is close to the one of the second grip block Side is provided with the first square groove, and the surface plate of second grip block is provided with the second square groove close to the side of the first grip block, described to subtract Mill pad is placed in the first square groove and the second square groove.
According to such scheme, the anti-attrition pad is around the middle square washer for being provided with third through-hole, third through-hole Provided with the 3rd groove, roller is provided with the 3rd groove.
According to such scheme, the quantity of the anti-attrition pad is two.
According to such scheme, the side of the surface plate of first grip block is provided with the first groove, second grip block Surface plate side be provided with the second groove, general flat key is also cross the first groove and the second groove.
Compared with prior art, the beneficial effects of the invention are as follows:By hydraulic fatigue machine drive the first grip block and Second grip block move back and forth, by the load transmission of vibration source to experiment bolt and experiment nut, realize laterally loading amplitude and The continuously adjustabe of frequency, can to loosening characteristic (clamping force, nut corner), transverse load and the real-time displacement monitoring of bolt, The anti-loosening property of various threaded fasteners is analyzed for engineers and technicians, the validity and assembly connection of various anti-loose methods is assessed Process optimization provides basic platform;The corner of experiment nut can be also measured simultaneously.
Brief description of the drawings
The embodiment to the present invention is described further below in conjunction with the accompanying drawings, wherein:
Fig. 1 is the general structure schematic diagram of the present invention;
Fig. 2 is the schematic elevation view of the first grip block in the present invention;
Fig. 3 is that the right side of the first grip block in the present invention regards schematic cross-sectional view;
Fig. 4 is the schematic elevation view of the second grip block in the present invention;
Fig. 5 is that the right side of the second grip block in the present invention regards schematic cross-sectional view;
Fig. 6 is the structural representation of bolt locating ring in the present invention;
Fig. 7 is the structural representation of anti-attrition pad in the present invention;
Fig. 8 is the attachment structure schematic diagram of nut outer corner measurement support and encoder in the present invention.
Each label is interpreted as in figure:The grip blocks of 1- first, the circular grooves of 11- first, the square grooves of 12- first, 13- first through hole, The grooves of 14- first, the grip blocks of 2- second, the circular grooves of 21- second, the square grooves of 22- second, the through holes of 23- second, the grooves of 24- second, 3- spiral shells Bolt locating ring, the left semi-rings of 31-, the right semi-rings of 32-, 33- parallel cuts, 4- anti-attrition pads, 41- third through-holes, the grooves of 42- the 3rd, 43- rollers, 5- nut outer corner measurement supports, 51- straight beams, 52- the first L-type fine strains of millet, 53 second L-type fine strains of millet, 54- fixed flat planars, 55- spiral shells Line axle sleeve, 6- experiment bolts, 7- experiment nuts, 8- pressure sensors, 9- encoders.
Embodiment
It is of the invention main by the first grip block 1, the second grip block 2, pressure sensor 8, nut outer corner measurement support 5 and volume Code device 9 is constituted.
The top of first grip block 1 is cylinder, and clamping is in the upper hydraulic chuck of fatigue tester.Bottom is flat Panel, the center of surface plate offers the first through hole 13 that internal diameter is more than the diameter of experiment bolt 6, and right side is machined with placement anti-attrition First square groove 12 of pad 4, left side is machined with the first circular groove 11 for placing bolt locating ring 3, placement is machined with sideways common flat First groove 14 of key.
The bottom of second grip block 2 is cylinder, and clamping is in the lower hydraulic chuck of fatigue tester.Top is flat Panel, the center of surface plate offers the second through hole 23 that internal diameter is more than the diameter of experiment bolt 6, and left side is machined with placement anti-attrition Second square groove 22 of pad 4, right side is machined with the second circular groove 21 of placement force sensor 8, placement is machined with sideways common flat Second groove 24 of key.
The outer shroud of bolt locating ring 3 is circle, and the outer annular diameter of bolt locating ring 3 is smaller than the diameter of the first circular groove 11 0.02mm;The center of bolt locating ring 3 is provided with the bolt head shapes identical regular hexagon with testing bolt 6, bolt locating ring 3 It is made up of the left semi-ring 31 and right semi-ring 32 that are symmetrical arranged and are bolted, left semi-ring 31 and right semi-ring 32 are respectively equipped with flat Row otch 33.After bolt locating ring 3 clamps the bolt head for testing bolt 6, the screw rod and all kinds of through holes of experiment bolt 6 can be achieved Center line alignment, it is to avoid in loading procedure test bolt 6 contacted with hole wall, increase test bolt 6 stand under load.
The anti-attrition pad 4 is to be provided with the 3rd around the middle square washer for being provided with third through-hole 41, third through-hole 41 Roller 43 is provided with groove 42, the 3rd groove 42.Anti-attrition pad 4 can reduce rubbing between the first grip block 1 and the second grip block 2 Wipe coefficient.
The nut outer corner measurement support 5 includes the first L-type beam 52 and the second L-type beam 53 for connecting into Contraband font beam;The One L-type beam 52 is connected by bolt with straight beam 51, and the second L-type beam 53 is connected to fixed flat planar 54, fixed flat planar 54 and encoder 9 It is fixedly connected, the center of fixed flat planar 54 is provided with through hole;The rotary shaft of encoder 9 passes through the through hole at the center of fixed flat planar 54, rotation Threaded sleeve 55 is fixedly connected with the top of rotating shaft, the center of threaded sleeve 55 is provided with the screw thread matched with experiment bolt 6.
The specific test method of this experimental rig is as follows:
Tu covers butter in the 3rd groove 42 of anti-attrition pad 4, and some rollers 43 are inserted in the 3rd groove 42, by two pieces Anti-attrition pad 4 is respectively implanted in the first square groove 12 and the second square groove 22 of the first grip block 1 and the second grip block 2.
First grip block 1 and the second grip block 2 are respectively fixed to the upper hydraulic chuck and lower hydraulic clip of fatigue tester In head, and ensure that the cylinder of the first grip block 1 and the second grip block 2 is concentric.By the first grip block 1 and the second grip block 2 The first groove 14 and the second groove 24 of side are alignd, and general flat key is placed in the first groove 14 and the second groove 24, with Ensure the center line alignment of the through hole 23 of first through hole 13 and second of the first grip block 1 and the second grip block 2.
Bolt locating ring 3 is fixed with testing the bolt head of bolt 6.
In the second circular groove 21 that pressure sensor 8 is inserted to the second grip block 2.
The experiment bolt 6 for being fixed with bolt locating ring 3 is sequentially passed through to the first through hole 13 of the first grip block 1, anti-wear gasket The third through-hole 41 of piece 4, then bolt locating ring 3 is placed in by the second through hole 23 and pressure sensor 8 of the second grip block 2 In first circular groove 11 of one grip block 1, finally experiment nut 7 is screwed in the end of the screw rod of experiment bolt 6.
Nut 7 is tested with the clamping of 51 and first L-type beam of straight beam 52 of nut outer corner measurement support 5, then consolidates encoder 9 Determine onto the fixed flat planar 54 of nut outer corner measurement support 5, be then fixedly connected with thread spindle at the top of the rotary shaft of encoder 9 Set 55, the end of screw rod of the threaded sleeve 55 with testing bolt 6 is fixedly connected.
The lower hydraulic chuck of fatigue tester is remained stationary as, and applies reciprocal displacement load to upper hydraulic chuck, can be achieved Load the continuously adjustabe of amplitude and frequency.Bolt 6 is tested in the presence of external load, experiment nut 7 is gradually rotated, and tests spiral shell The clamping force of mother 7 is slowly reduced, so as to loosen.The angle for testing the rotation of nut 7 passes through the measurement in real time of encoder 9, experiment The clamping force of bolt 6 is then measured in real time by pressure sensor 8.Test the transverse load of bolt 6 and be displaced through fatigue tester The pressure sensor and displacement sensor carried on hydraulic chuck.

Claims (9)

1. a kind of experimental rig for measuring bolt looseness under action of lateral load, it is characterised in that:One end of first grip block (1) For cylinder, the other end is surface plate, and the center of surface plate is provided with first through hole (13);One end of second grip block (2) is circle Cylinder, the other end is surface plate, and the center of surface plate is provided with the second through hole (23);The side of the surface plate of second grip block (2) It is close to mutually with the surface plate of the first grip block (1), opposite side is connected with pressure sensor (8);Second through hole (23) and first Through hole (13) is concentric, and the cylinder of the first grip block (1) and the second grip block (2) is concentric.
2. a kind of experimental rig for measuring bolt looseness under action of lateral load according to claim 1, it is characterised in that: Also include the nut outer corner measurement support (5) and encoder (9) for connecting into an entirety.
3. a kind of experimental rig for measuring bolt looseness under action of lateral load according to claim 2, it is characterised in that: The nut outer corner measurement support (5) includes the first L-type beam (52) and the second L-type beam (53), the first L-type beam (52) and the 2nd L Type beam (53) connects into " Contraband " font beam;First L-type beam (52) is connected by bolt with straight beam (51), and the second L-type beam (53) is even Fixed flat planar (54) is connected to, fixed flat planar (54) is fixedly connected with encoder (9), the center of fixed flat planar (54) is provided with through hole; The rotary shaft of encoder (9) passes through and is fixedly connected with threaded sleeve at the top of the through hole at fixed flat planar (54) center, rotary shaft (55), the center of threaded sleeve (55) is provided with the screw thread matched with experiment bolt (6).
4. a kind of experimental rig for measuring bolt looseness under action of lateral load according to claim 1, it is characterised in that: Side of the surface plate away from the second grip block (2) of first grip block (1) is provided with bolt locating ring (3), and the bolt is determined The center of position ring (3) is provided with the bolt head shapes identical regular hexagon with experiment bolt (6).
5. a kind of experimental rig for measuring bolt looseness under action of lateral load according to claim 4, it is characterised in that: The bolt locating ring (3) is made up of the left semi-ring (31) and right semi-ring (32) for being symmetrical arranged and being bolted, left semi-ring And right semi-ring (32) is respectively equipped with parallel cuts (33) (31).
6. a kind of experimental rig for measuring bolt looseness under action of lateral load according to claim 1, it is characterised in that: Also include anti-attrition pad (4);The surface plate of first grip block (1) is provided with first party close to the side of the second grip block (2) Groove (12), the surface plate of second grip block (2) is provided with the second square groove (22) close to the side of the first grip block (1), described Anti-attrition pad (4) is placed in the first square groove (12) and the second square groove (22).
7. a kind of experimental rig for measuring bolt looseness under action of lateral load according to claim 6, it is characterised in that: The anti-attrition pad (4) is to be provided with threeway around the middle square washer for being provided with third through-hole (41), third through-hole (41) Roller (43) is provided with groove (42), the 3rd groove (42).
8. a kind of experimental rig for measuring bolt looseness under action of lateral load according to claim 6, it is characterised in that: The quantity of the anti-attrition pad (4) is two.
9. a kind of experimental rig for measuring bolt looseness under action of lateral load according to claim 1, it is characterised in that: The side of the surface plate of first grip block (1) is provided with the first groove (14), the side of the surface plate of second grip block (2) Face is provided with the second groove (24), and general flat key is also cross the first groove (14) and the second groove (24).
CN201710388811.7A 2017-05-27 2017-05-27 The experimental rig of bolt looseness under a kind of measurement action of lateral load Expired - Fee Related CN107036797B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108982042A (en) * 2018-09-21 2018-12-11 中国航空工业集团公司沈阳飞机设计研究所 A kind of rivet resistance to shock test structure
CN109211508A (en) * 2018-11-09 2019-01-15 太原科技大学 One kind being bolted loosening test macro
CN109283041A (en) * 2018-10-09 2019-01-29 大连理工大学 The experimental provision and experimental method of connected piece limit contact stress in a kind of measurement bolt joint
CN110657976A (en) * 2019-10-12 2020-01-07 北京工业大学 Bolt fastening experimental device for ensuring coaxiality
CN111307387A (en) * 2020-03-06 2020-06-19 西南交通大学 Bolt transverse load and axial load test clamp and test method thereof
CN112097706A (en) * 2020-08-24 2020-12-18 中国大唐集团科学技术研究院有限公司西北电力试验研究院 Wind power tower cylinder flange bolt looseness real-time monitoring system and early warning method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0198704A (en) * 1987-10-08 1989-04-17 Mitsui Eng & Shipbuild Co Ltd Device for detecting bolt looseness
CN204314068U (en) * 2014-12-23 2015-05-06 西南交通大学 The loosening test device be threaded under a kind of axial La-La load
CN204679270U (en) * 2015-06-17 2015-09-30 西南交通大学 The loosening test device that under a kind of lateral load, bolt group connects
CN106441838A (en) * 2016-09-07 2017-02-22 三峡大学 Adjustable high precision bolt dynamic loosening test vibration instrument under action of tensile, compression and shear force
CN206020020U (en) * 2016-09-12 2017-03-15 三峡大学 Bolt looseness tester

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0198704A (en) * 1987-10-08 1989-04-17 Mitsui Eng & Shipbuild Co Ltd Device for detecting bolt looseness
CN204314068U (en) * 2014-12-23 2015-05-06 西南交通大学 The loosening test device be threaded under a kind of axial La-La load
CN204679270U (en) * 2015-06-17 2015-09-30 西南交通大学 The loosening test device that under a kind of lateral load, bolt group connects
CN106441838A (en) * 2016-09-07 2017-02-22 三峡大学 Adjustable high precision bolt dynamic loosening test vibration instrument under action of tensile, compression and shear force
CN206020020U (en) * 2016-09-12 2017-03-15 三峡大学 Bolt looseness tester

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108982042A (en) * 2018-09-21 2018-12-11 中国航空工业集团公司沈阳飞机设计研究所 A kind of rivet resistance to shock test structure
CN109283041A (en) * 2018-10-09 2019-01-29 大连理工大学 The experimental provision and experimental method of connected piece limit contact stress in a kind of measurement bolt joint
CN109211508A (en) * 2018-11-09 2019-01-15 太原科技大学 One kind being bolted loosening test macro
CN110657976A (en) * 2019-10-12 2020-01-07 北京工业大学 Bolt fastening experimental device for ensuring coaxiality
CN111307387A (en) * 2020-03-06 2020-06-19 西南交通大学 Bolt transverse load and axial load test clamp and test method thereof
CN112097706A (en) * 2020-08-24 2020-12-18 中国大唐集团科学技术研究院有限公司西北电力试验研究院 Wind power tower cylinder flange bolt looseness real-time monitoring system and early warning method

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