CN110186783A - Compression shear of dropping hammer impact test apparatus - Google Patents
Compression shear of dropping hammer impact test apparatus Download PDFInfo
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- CN110186783A CN110186783A CN201910365555.9A CN201910365555A CN110186783A CN 110186783 A CN110186783 A CN 110186783A CN 201910365555 A CN201910365555 A CN 201910365555A CN 110186783 A CN110186783 A CN 110186783A
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- hinged shaft
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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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
- G01N2203/001—Impulsive
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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
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0039—Hammer or pendulum
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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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
It drops hammer compression shear impact test apparatus the invention proposes one kind, it is fast to solve existing test method impact velocity, there are larger security risks, the problem of being not easy to the mechanical responses such as observation crack propagation, including support construction and power supply, the top of support construction is provided with carrying means, the impact assembly and holding relieving mechanism gone up and down by carrying means driving, the lower part of support construction is provided with impact specimen loaded structure, the signal output end of impact specimen loaded structure is connected with strain measurement system, the side of impact specimen loaded structure is provided with optic testing system.The present invention realizes the real-time strain and optical measurement of middle low speed rock compression shear impact, it is used cooperatively using drop impact and compression shear fixture, low speed rock compression shear shock-testing in realization, deformation and mechanical response in destructive process are impacted using the direct stain measuring technology in surface and digital speckle indirect method of measurement record, and crack propagation process is recorded by high-speed camera.
Description
Technical field
The present invention relates to rock dynamic compression-shear test technical field, drop hammer compression shear impact test dress more particularly, to one kind
It sets.
Background technique
Constitutive relation of the rock under Impact Load is the research heat in the fields such as blasting engineering, underground protective engineering
Point, how to obtain the mechanical response of material under impact load is key therein.Rock belongs to natural material, internal joints development
Irregularly, the crack rule of development of the rock under compression shear state in explosion etc. under impact loads, for the works such as digging up mine, protecting
Journey has important theory significance, and the research of rock dynamic compression shear performance test is that engineering circles are badly in need of the great pivotal trial carried out
One of.
Hopkinson bar is one of the most basic means of research material dynamic mechanical, and basic principle is mentioned to test specimen
It can control the pulse signal of amplitude, shape and duration etc. for one, then by obtaining on two bars of analysis
The ess-strain information of the stress wave signal test specimen that you can get it between two bars, the power of test block so as to obtain
Learn performance.The mechanical property of the test specimen measured at this time is in the case where high speed, high strain-rate.General Hopkinson bar
Loading velocity and strain rate are larger, are relatively specific for the dynamic response of the high-speed motions such as bullet, are not suitable for compression shear compound flushing
It hits, and is not easy to the mechanical responses such as observation crack propagation, the mechanics for fragile materials such as rocks, under middle low velocity impact or so
Response is obviously also important, therefore it is also the perfect key one of shock dynamics that research and development, which are applicable in the experimental rig of middle low velocity impact,
Ring.
Drop hammer test device is mainly used for the impact failure of plate class material at present, and can only test under different-energy and impact
The number of destruction cannot quantitatively test the deformation and mechanical response process in impact process to detect the qualification rate of material.?
Have not seen the loading device of rock compression shear composite impact load.So researching and developing one kind can be realized middle low speed rock compression shear impact
The device of test is particularly important.
Summary of the invention
The present invention proposes that one kind is dropped hammer compression shear impact test apparatus, and to solve, existing test method destructive power is larger, deposits
In larger security risk, it is not easy to the problem of mechanical responses such as observation crack propagation, is carried out with reaching middle low speed to rock sample
Impact quantitatively tests deformation and mechanical response process in impact process, increases the purpose of Security of test.
The technical scheme of the present invention is realized as follows:
Compression shear of dropping hammer impact test apparatus, including being used to support the support construction of device entirety and for being that device is whole
The power supply of electric energy is provided, the top of support construction is provided with carrying means, drives the impact assembly gone up and down by carrying means
And it is arranged between carrying means and impact assembly for controlling impact assembly release and when impact assembly is sprung back for the first time
Hold the holding relieving mechanism of impact assembly tightly, the lower part of support construction, which is provided with, is holding relieving mechanism release tightly for impact assembly
The impact specimen loaded structure that impact generates compression shear strain, the signal output end connection of impact specimen loaded structure are carried out afterwards
Have for based in wireless dynamic strain measuring technical foundation to impact specimen loaded structure generate compression shear strain be acquired
The strain measurement system of analysis, the side of impact specimen loaded structure, which is provided with, to be displaced and is based on for recording the impact moment whole audience
Digital speckle measurement method calculates the optic testing system of strain field and crack propagation velocity.
Technical solution is advanced optimized, the support construction includes the pedestal of rectangular-blocklike, is vertically arranged in pedestal top
Two columns on end face and the top plate that two column tops are arranged in are respectively provided with sliding rail on the inner sidewall of two columns.
Technical solution is advanced optimized, the carrying means include that hoist ropes and setting are used on top plate by hoist ropes
It is wound the driving mechanism of release, driving mechanism includes traction motor and turn being connected with the output shaft end of traction motor
Dynamic roller, hoist ropes winding setting is on rotation roller.
Advanced optimize technical solution, the impact assembly include rectangular-blocklike setting drop hammer and it is mutually solid with dropping hammer
Fixed spherical handle, the two sides dropped hammer are provided with the smooth groove being mutually equipped with sliding rail.
Technical solution is advanced optimized, the holding relieving mechanism includes the card slot and cross being slidably arranged on two columns
To be arranged between two columns for electricity condition when be mutually clamped with card slot and in power failure state with card slot be detached from be clamped
Impulse interference wave switch, the bottom end of impulse interference wave switch are provided with the clamp matched with spherical handle by link mechanism, in link mechanism
Portion is provided with for compressing or extending in the case where carrying means drive and then link mechanism and clamp is driven to carry out release or clamping punching
The spring of component is hit, hoist ropes passes through impulse interference wave switch and the top of link mechanism is connected with spring.
Technical solution is advanced optimized, the impulse interference wave switch includes the internal rectangular box in cavity body structure, rectangular box
It is inside provided with the iron core that periphery is wound with hot-wire coil, the left and right ends of iron core pass through spring b respectively and are connected in rectangle
The armature that is slided in framework and be separately positioned on two armature not with the one end connecting spring b and pass through rectangular box and card
Two pins that slot is mutually equipped with, the left and right ends of rectangular box offer respectively to be connected for so that pin passes through with cavity body structure
Perforating, hot-wire coil is electrically connected at power supply.
Advanced optimize technical solution, the link mechanism include the top hinged shaft for being fixed at rectangular box bottom end,
The left end hinged shaft being connected with top hinged shaft by first connecting rod, the bottom end hinge being connected with left end hinged shaft by second connecting rod
Axis, the right end hinged shaft being connected by third connecting rod with bottom end hinged shaft and connecting is arranged between right end hinged shaft and top hinged shaft
Fourth link；The spring is arranged between top hinged shaft and bottom end hinged shaft；The clamp are divided into the left end of arc-shaped shape
Clamp and the right end clamp being oppositely arranged with left end clamp, left end clamp connect with third connecting rod is hinged on bottom end hinged shaft jointly
On, right end clamp connect with second connecting rod to be hinged on jointly on the hinged shaft of bottom end.
Technical solution is advanced optimized, the impact specimen loaded structure includes two compression shears immediately below impact assembly
Fixture and the impact specimen being arranged between two compression shear fixtures, two compression shear fixtures include the compressive-shear fixture being set on the base
And the upper compression shear fixture above compressive-shear fixture is set, the top end face of the bottom face and compressive-shear fixture of upper compression shear fixture is
Inclined surface with same tilt angle；It is provided with strain rosette on the impact specimen, upper compression shear fixture and compressive-shear fixture
Foil gauge is provided on side wall；
The periphery of the impact specimen loaded structure is provided with bottom end and is mutually fixed for preventing blast fragments from jumping out with pedestal
Guard box, guard box be full transparent protective film cabinet.
Technical solution is advanced optimized, the strain measurement system includes electric with foil gauge and strain rosette respectively by conducting wire
Property connection wireless dynamic strain indicator and be connected with wireless dynamic strain indicator for carrying out by wireless transmission collection system
The signal output end of the laptop of data processing, foil gauge and strain rosette is connected to the input of wireless dynamic strain indicator
End, the output end of wireless dynamic strain indicator are connected to the input terminal of laptop.
Technical solution is advanced optimized, the optic testing system includes being arranged immediately ahead of impact specimen to use by bracket
In the high speed video camera of record impact moment whole audience displacement.
Using above-mentioned technical proposal, the invention has the benefit that
The present invention realizes the real-time strain and optical measurement of middle low speed rock compression shear impact, using drop impact and pressure
It cuts fixture to be used cooperatively, low speed rock compression shear shock-testing in realization, using the direct stain measuring technology in surface and digital speckle
Indirect method of measurement record impacts deformation and mechanical response in destructive process, and records crack propagation mistake by high-speed camera
Journey provides necessary research equipment for the perfect of ballistics.
The group of different-energy and different impact velocitys may be implemented by changing the weight dropped hammer and shock height in the present invention
It closes, by compression shear and the combination dropped hammer, can be realized the impact of rock compression shear, provide reliable test for rock compression shear dynamic response
Method can be realized whole audience displacement, crack propagation velocity precise measurement, and drop impact precision is high, and test efficiency is high.
For the present invention by wireless dynamic strain measuring technology, real-time measurement compression shear fixture, the mechanics on impact specimen surface are loud
It answers, angularly studies impact process to the affecting laws of impact specimen failure mode from impact transmitting and strain-responsive.
The present invention records entire impact failure process by DIC digital speckle measuring technology combination high-speed camera in real time,
The displacement of the moment whole audience and crack propagation process are impacted, strain field, crack propagation speed are calculated based on digital speckle measurement method
Degree provides reliable measuring technology for impact fracture mechanics and supports.
The present invention makes full transparent protective film cabinet, can be effectively prevented blast fragments and jump out.
The present invention holds relieving mechanism tightly and can also hold tightly dropping hammer to complete to drop hammer when the first Secondary Shocks are sprung back, effectively
Ground prevents secondary pulse.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of the present invention for holding relieving mechanism tightly；
Fig. 3 is the structural schematic diagram of impulse interference wave switch of the present invention.
Wherein: 1, pedestal, 2, column, 3, sliding rail, 4, drop hammer, 5, clamp, 6, link mechanism, 7, spring, 8, hoist ropes, 9,
Traction motor, 10, impulse interference wave switch, 11, compression shear fixture, 12, foil gauge, 13, strain rosette, 14, conducting wire, 15, wireless dynamic strain
Instrument, 16, laptop, 17, high speed video camera, 18, guard box, 19, impact specimen, 20, card slot, 21, hot-wire coil, 22,
Iron core, 23, armature, 24, spring b, 25, pin.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
One kind is dropped hammer compression shear impact test apparatus, in conjunction with shown in Fig. 1 to Fig. 3, including support device entirety, power supply, traction
Mechanism, holds relieving mechanism, impact specimen loaded structure, strain measurement system and optic testing system tightly at impact assembly.
The support construction that support device is integrally used for, electricity consumption, which is derived from, integrally provides electric energy for device.The top of support construction
Be provided with carrying means, by the carrying means impact assembly that is gone up and down of driving and setting carrying means and impact assembly it
Between for control impact assembly release and impact assembly for the first time spring back when hold tightly impact assembly holding relieving mechanism, support
The lower part of structure, which is provided with, carries out rushing for impact generation compression shear strain after holding relieving mechanism release tightly for impact assembly
Sample loaded structure is hit, the signal output end of impact specimen loaded structure is connected with for based on wireless dynamic strain measuring technology
On the basis of the strain measurement system of analysis is acquired to the compression shear strain that impact specimen loaded structure generates, impact specimen is loaded
The side of structure, which is provided with, to be displaced and is based on for the record impact moment whole audience digital speckle measurement method calculating strain field and split
The optic testing system of line expansion rate.
Support construction includes the pedestal 1 of rectangular-blocklike, two columns 2 being vertically arranged on 1 top end face of pedestal and sets
The top plate on two columns, 2 top is set, stable rack construction is formed, is respectively provided with sliding rail 3 on the inner sidewall of two columns 2.
Carrying means include hoist ropes 8 and are arranged on top plate for hoist ropes 8 to be wound to the driving machine of release
Structure, driving mechanism include traction motor 9 and the rotation roller being connected with the output shaft end of traction motor 9, and hoist ropes 8 is wound
Setting is on rotation roller.In addition, carrying means further include the control switch for controlling the running of traction motor 9, control is pressed
Carrying means running can be realized in switch, and then impact assembly is promoted to specified height.
Impact assembly includes 4 and the spherical handle fixed with 4 phases of dropping hammer of dropping hammer of rectangular-blocklike setting, and dropping hammer 4 is
Metal block may be configured as different weight, and for weight size depending on practical situation to be detected, the present invention passes through the weight that drops hammer
Amount and shock height control impact energy and impact velocity.Drop hammer 4 left and right length it is identical as the spacing between two columns 2, protect
Demonstrate,prove the stability for 4 whereabouts of dropping hammer.Drop hammer 4 two sides be provided with 3 phase of sliding rail be equipped with smooth groove so that drop hammer 4 with installing
It sets on two columns 2, can be moved up and down along column 2, and do not deviate by vertical position, Jin Erbao during decline
Demonstrate,prove the accuracy of test.
Hold tightly relieving mechanism include be slidably arranged in the upper card slot 20 of two columns 2 and be horizontally installed on two columns 2 it
Between impulse interference wave switch 10, the bottom end of impulse interference wave switch 10 is provided with the clamp 5 matched with spherical handle by link mechanism 6, rushes
The bottom end and 6 phase of link mechanism for hitting switch 10 are fixed.Card slot 20 is installation fixed card slot of the sliding on column, and height is adjustable.
Card slot 20 includes suit setting to the rectangle casing on column and two transverse plates being horizontally installed on rectangle casing, and two laterally
There is certain gap, two transverse plates are arranged in the inside of column, can carry out between rectangle casing and column outer wall between plate
Sliding, is positioned between casing and column by screw, card slot 20 can be fixed to column by screw after having adjusted height
On.
Through-hole is provided on impulse interference wave switch 10, the top of link mechanism 6 is again provided with through-hole b, and hoist ropes 8 passes through impact
The top of switch 10 and link mechanism 6 is connected with spring 7.The middle part of link mechanism 6 is provided with spring 7, and spring 7 is for draging
Draw mechanism and drive lower compression or elongation, and then link mechanism 6 and clamp 5 is driven to carry out release or clamping impact assembly.Impact is opened
10 are closed for being clamped when obtaining electricity condition with 20 phase of card slot, and is detached from and is clamped with card slot 20 in power failure state.
Impulse interference wave switch 10 includes the internal rectangular box in cavity body structure, is provided with periphery in rectangular box and is wound with energization
The iron core 22 of coil 21, the left and right ends of iron core 22 pass through spring b24 respectively and are connected with to be slided in rectangular box
Armature 23 and be separately positioned on two armature 23 not with the one end connecting spring b24 and pass through rectangular box and card slot 20 and match
Two pins 25 of dress, the left and right ends of rectangular box offer respectively to be connected for passing through pin 25 with cavity body structure
Perforating, hot-wire coil 21 are electrically connected at power supply.
After hot-wire coil 21 is powered, hot-wire coil 21 generates magnetomechanical effects, and iron core 22 generates suction, armature to armature 23
23 move inward in rectangular box, compress to spring b24, and pin 25 bounces back out of card slot 20.Close impulse interference wave switch
After power supply, hot-wire coil 21 loses galvanomagnetic-effect, and iron core 22 is separated with armature 23, and spring b24 restores, and pin 25 moves out,
It is inserted into card slot 20, realizes the positioning of impulse interference wave switch 10.
Link mechanism 6 includes that the top hinged shaft for being fixed at rectangular box bottom end and top hinged shaft pass through first connecting rod
The left end hinged shaft that is connected, the bottom end hinged shaft being connected by second connecting rod with left end hinged shaft pass through third company with bottom end hinged shaft
The fourth link between right end hinged shaft and top hinged shaft is arranged in the right end hinged shaft and connection that bar is connected.Through-hole b is provided with
On the hinged shaft of top；Spring 7 is arranged between top hinged shaft and bottom end hinged shaft；Clamp 5 be divided into the left end clamp of arc-shaped shape with
And the right end clamp being oppositely arranged with left end clamp, left end clamp connect with third connecting rod to be hinged on jointly on the hinged shaft of bottom end, right
End clamp connect with second connecting rod to be hinged on jointly on the hinged shaft of bottom end.
When impulse interference wave switch 10 is not clamped with 20 phase of card slot, the gravity downward by impulse interference wave switch 10 of spring 7, impact assembly
The upward tractive force of downward gravity and carrying means.At this point, the upward tractive force of carrying means and impulse interference wave switch 10 are downward
Gravity and the downward gravity of impact assembly between it is equal, so spring 7 is in the raw, clamp 5 carry out spherical handle
Clamping, and carrying means can average rate be lifted up impact assembly.
When impulse interference wave switch 10 is clamped with 20 phase of card slot, is navigated on the card slot 20 of two columns 2, made due to impulse interference wave switch 10
Spring 7 is no longer influenced by the gravity of impulse interference wave switch 10, the only gravity and carrying means downward by impact assembly of spring 7
Upward tractive force.At this point, the upward tractive force of carrying means is greater than the downward gravity of impact assembly, so spring 7 is compressed,
And then second connecting rod and third connecting rod is driven to expand outwardly, and then the left end clamp being attached thereto and right end clamp opening is driven to become
Greatly, so that clamp no longer carry out clamping, impact assembly and then free-falling to spherical handle.
Impact specimen loaded structure includes two compression shear fixtures 11 being located at immediately below impact assembly and is arranged in two compression shears
Impact specimen 19 between fixture 11, two compression shear fixtures 11 include the compressive-shear fixture being arranged on pedestal 1 and are arranged under
Upper compression shear fixture above compression shear fixture, the bottom face of upper compression shear fixture and the top end face of compressive-shear fixture are with same tilt
The inclined surface of angle.Two compression shear fixtures 11 have multiple spare packages, can provide different compression shear inclination angles, design and drop hammer in vertical side
Stringent centering is kept upwards.
It is provided with strain rosette 13 on impact specimen 19, is provided with foil gauge on the side wall of upper compression shear fixture and compressive-shear fixture
12.Foil gauge 12, which is pasted on the side wall of compression shear fixture and compressive-shear fixture, vertically to be pasted, and impact load transmittance process is tested.
Strain rosette 13 is pasted on the position that impact specimen surface may be destroyed, and test impact starts until impact is impacted during terminating
The mechanical response of sample.
The periphery of impact specimen loaded structure is provided with the bottom end guard box 18 fixed with 1 phase of pedestal, and guard box 18 is complete
Transparency protected cabinet.Guard box 18 uses all-transparent pmma material, and four sides can freely be placed in pedestal by hinge connection
On, a protective cover is formed, prevents blast fragments from jumping out and hurting tester.
Strain measurement system includes the wireless dynamic being electrically connected respectively with foil gauge 12 and strain rosette 13 by conducting wire 14
Deformeter 15 and the pen being connected with wireless dynamic strain indicator 15 for carrying out data processing by wireless transmission collection system
Remember this computer 16, the signal output end of foil gauge 12 and strain rosette 13 is connected to the input terminal of wireless dynamic strain indicator 15,
The output end of wireless dynamic strain indicator 15 is connected to the input terminal of laptop 16.
Optic testing system includes the high speed video camera 17 that 19 front of impact specimen is arranged in by bracket, is shot with video-corder at a high speed
Machine 17 is for recording impact moment whole audience displacement.
Specific step is as follows for low velocity impact experimental test in present invention progress rock compression shear.
Card slot 20 is fixed on column 2 by the first step, so that the height and position of two card slots of left and right is identical.
Second step 4 carries out promotion positioning to dropping hammer.Impulse interference wave switch 10 and link mechanism decline are driven by traction motor
To specified altitude assignment (i.e. the position of impulse interference wave switch 10 and 20 flush of card slot), impulse interference wave switch 10 is triggered, that is, closes impulse interference wave switch
Power supply, hot-wire coil 21 lose galvanomagnetic-effect, and iron core 22 is separated with armature 23, and spring b24 restores, and pin 25 moves out, and insert
Enter into card slot 20, realizes the positioning of impulse interference wave switch 10.At this moment, the upward traction of hoist ropes 8, spring 7 are driven by traction motor
It is compressed, and then second connecting rod and third connecting rod is driven to expand outwardly, to open with moving calipers 5, and the package of clamp 5 is fallen
Hammer the spherical handle on 4 tops into shape.
Impulse interference wave switch 10 is triggered again, opens the power supply of impulse interference wave switch at this time, and hot-wire coil 21 is powered, and hot-wire coil 21 produces
Magnetisation stress effect, iron core 22 generate suction to armature 23, and armature 23 is moved inward in rectangular box, pressed spring b24
Contracting, pin 25 bounce back out of card slot 20.At this point, the gravity that the gravity downward by impulse interference wave switch 10 of spring 7, impact assembly are downward
And the tractive force that carrying means are upward.The upward tractive force of carrying means and the downward gravity of impulse interference wave switch 10 and impact assembly
Equal between downward gravity, so spring 7 is in the raw, clamp 5 carry out clamping to spherical handle, realize to dropping hammer 4
Clamping hold tightly, and carrying means can average rate be lifted up impact assembly, will be dropped hammer by carrying means and 4 be promoted to specified height
Degree.
Third step, the height adjustment of card slot 20 adjust upward height of the card slot 20 on column 1, specific to adjust height
According to be reached drop hammer 4 impact velocity depending on so that left and right two card slots height and position it is identical.
4th step, drop hammer 4 release.The upward traction of hoist ropes 8 is driven by traction motor, will drop hammer 4 is promoted to card slot
Height at 20.At this point, triggering impulse interference wave switch 10, that is, close the power supply of impulse interference wave switch, hot-wire coil 21 loses galvanomagnetic-effect, iron
The heart 22 is separated with armature 23, and spring b24 restores, and pin 25 is moved out, is inserted into card slot 20, realizes determining for impulse interference wave switch 10
Position.At this moment, it continues through traction motor and drives the upward traction of hoist ropes 8, since impulse interference wave switch 10 navigates to the card slot of two columns 2
On 20 so that spring 7 is no longer influenced by the gravity of impulse interference wave switch 10, spring 7 only the gravity downward by impact assembly and
The upward tractive force of carrying means.The upward tractive force of carrying means is greater than the downward gravity of impact assembly, so spring 7 is pressed
Contracting, and then second connecting rod and third connecting rod is driven to expand outwardly, so that the left end clamp being attached thereto and right end clamp be driven to open
Mouthful become larger, so that clamp no longer carry out clamping to spherical handle, dropping hammer 4 is released and is impacted.
5th step, the impact force being subject to impact specimen 19 detect.It drops hammer when falling on the compression shear fixture on top under 4,
Certain impact force can be generated to the impact specimen 19 being arranged between upper and lower two compression shear fixtures.It is tested and is impacted by foil gauge 12
Load transmittance process is tested the mechanical response of the impact specimen during impact terminates impacting by strain rosette 13, answered
Become piece 12 and strain rosette 13 and the information tested is fed back into wireless dynamic strain indicator 15, then passes through wireless transmission collection system
It is input to laptop 16, carries out data processing.
6th step, the detection of crack propagation velocity.High-speed camera 17 is placed in the front of impact specimen 19, is adjusted
For focal length to clear, impact specimen 19 passes through two kinds of paint sprayings of black and white, forms high-quality speckle to measure, test process whole process note
Record, carries out image procossing for digital picture, forms the number format of pixel, the displacement for obtaining each pixel carries out subsequent point
Analysis.Impact moment whole audience displacement is recorded using high-speed camera 17, strain field is calculated based on digital speckle measurement method, crackle expands
Open up speed.
7th step 4 holds tightly to dropping hammer for test is completed, prevents secondary pulse.When dropping hammer, 4 spherical handle is moved to
When 5 position of clamp, impulse interference wave switch 10 is triggered again, opens the power supply of impulse interference wave switch at this time, and hot-wire coil 21 is powered, hot-wire coil
21 generate magnetomechanical effects, and iron core 22 generates suction to armature 23, and armature 23 moves inward in rectangular box, to spring b24 into
Row compression, pin 25 bounce back out of card slot 20.At this point, the gravity downward by impulse interference wave switch 10 of spring 7, impact assembly are downward
Gravity and the upward tractive force of carrying means.The upward tractive force of carrying means and the downward gravity of impulse interference wave switch 10 and impact
Equal between the downward gravity of component, so spring 7 is in the raw, clamp 5 carry out clamping to spherical handle, realize to falling
The clamping of hammer 4 is held tightly.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. compression shear of dropping hammer impact test apparatus, it is characterised in that: including being used to support the support construction of device entirety and being used for
The power supply of electric energy is integrally provided for device, the top of support construction is provided with carrying means, is gone up and down by carrying means driving
Impact assembly and be arranged between carrying means and impact assembly for controlling impact assembly release and in impact assembly the
Hold the holding relieving mechanism of impact assembly when primary rebound tightly, the lower part of support construction, which is provided with, releases for impact assembly in holding
The impact specimen loaded structure that impact generates compression shear strain, the signal of impact specimen loaded structure are carried out after laying mechanism release
Output end is connected with for being answered based on the compression shear generated in wireless dynamic strain measuring technical foundation to impact specimen loaded structure
Become the strain measurement system for being acquired analysis, the side of impact specimen loaded structure is provided with for recording the impact moment whole audience
It is displaced and calculates based on digital speckle measurement method the optic testing system of strain field and crack propagation velocity.
2. the compression shear impact test apparatus according to claim 1 that drops hammer, it is characterised in that: the support construction includes in square
The block-like pedestal of shape (1), two columns (2) being vertically arranged on pedestal (1) top end face and setting are on two columns (2) top
Top plate is respectively provided with sliding rail (3) on the inner sidewall of two columns (2).
3. the compression shear impact test apparatus according to claim 2 that drops hammer, it is characterised in that: the carrying means include traction
Rope (8) and setting are used to for hoist ropes (8) being wound the driving mechanism of release on top plate, and driving mechanism includes traction electricity
Machine (9) and the rotation roller being connected with the output shaft end of traction motor (9), hoist ropes (8) winding setting is in rotation roller
On.
4. the compression shear impact test apparatus according to claim 3 that drops hammer, it is characterised in that: the impact assembly includes in square
The setting of shape bulk drop hammer (4) and with (4) the mutually fixed spherical handle that drops hammer, the two sides of (4) of dropping hammer are provided with and sliding rail (3)
Mutually equipped smooth groove.
5. the compression shear impact test apparatus according to claim 4 that drops hammer, it is characterised in that: the holding relieving mechanism includes
The card slot (20) that is slidably arranged on two columns (2) and be horizontally installed between two columns (2) for electricity condition when with
Card slot (20) is mutually clamped and is detached from the impulse interference wave switch (10) of clamping, the bottom of impulse interference wave switch (10) with card slot (20) in power failure state
End is provided with the clamp (5) matched with spherical handle by link mechanism (6), is provided with and is used in the middle part of link mechanism (6)
It compresses or extends under carrying means drive and then link mechanism (6) and clamp (5) is driven to carry out release or clamping impact assembly
Spring (7), the top that hoist ropes (8) passes through impulse interference wave switch (10) and link mechanism (6) is connected with spring (7).
6. the compression shear impact test apparatus according to claim 5 that drops hammer, it is characterised in that: the impulse interference wave switch (10) includes
Inside is in the rectangular box of cavity body structure, is provided with the iron core (22) that periphery is wound with hot-wire coil (21), iron in rectangular box
The left and right ends of the heart (22) pass through respectively spring b (24) be connected with the armature (23) slided in rectangular box and
Be separately positioned on two armature (23) not with the one end connecting spring b (24) and pass through rectangular box and card slot (20) mutually equipped two
Pin (25), the left and right ends of rectangular box offer to be connected with cavity body structure respectively and be used for so that wearing of passing through of pin (25)
Apertured, hot-wire coil (21) are electrically connected at power supply.
7. the compression shear impact test apparatus according to claim 6 that drops hammer, it is characterised in that: the link mechanism (6) includes
Be fixed at the top hinged shaft of rectangular box bottom end, the left end hinged shaft being connected by first connecting rod with top hinged shaft, with it is left
Bottom end hinged shaft that end hinged shaft is connected by second connecting rod, the right end hinged shaft being connected with bottom end hinged shaft by third connecting rod and
The fourth link between right end hinged shaft and top hinged shaft is arranged in connection；Spring (7) setting is cut with scissors in top hinged shaft and bottom end
Between axis；The right end clamp that the clamp (5) are divided into the left end clamp of arc-shaped shape and are oppositely arranged with left end clamp, it is left
End clamp connect with third connecting rod to be hinged on jointly on the hinged shaft of bottom end, and right end clamp connect with second connecting rod is hinged on bottom end jointly
On hinged shaft.
8. the compression shear impact test apparatus according to claim 2 that drops hammer, it is characterised in that: the impact specimen loaded structure
Including the impact specimen for being located at two compression shear fixtures (11) immediately below impact assembly and being arranged between two compression shear fixtures (11)
(19), two compression shear fixtures (11) include the compressive-shear fixture being arranged on pedestal (1) and are arranged in above compressive-shear fixture
Upper compression shear fixture, the bottom face of upper compression shear fixture and the top end face of compressive-shear fixture are the inclined surface with same tilt angle；
It is provided with strain rosette (13) on the impact specimen (19), is provided with foil gauge on the side wall of upper compression shear fixture and compressive-shear fixture
(12)；
The periphery of the impact specimen loaded structure is provided with what bottom end and pedestal (1) were mutually fixed for preventing blast fragments from jumping out
Guard box (18), guard box (18) are full transparent protective film cabinet.
9. the compression shear impact test apparatus according to claim 8 that drops hammer, it is characterised in that: the strain measurement system includes
The wireless dynamic strain indicator (15) that is electrically connected respectively with foil gauge (12) and strain rosette (13) by conducting wire (14) and pass through
Wireless transmission collection system is connected the laptop (16) for carrying out data processing with wireless dynamic strain indicator (15), answers
The signal output end of change piece (12) and strain rosette (13) is connected to the input terminal of wireless dynamic strain indicator (15), wireless dynamic
The output end of deformeter (15) is connected to the input terminal of laptop (16).
10. the compression shear impact test apparatus according to claim 8 that drops hammer, it is characterised in that: the optic testing system packet
Include the high speed video camera (17) being displaced immediately ahead of impact specimen (19) for recording the impact moment whole audience by bracket setting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910365555.9A CN110186783A (en) | 2019-05-01 | 2019-05-01 | Compression shear of dropping hammer impact test apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910365555.9A CN110186783A (en) | 2019-05-01 | 2019-05-01 | Compression shear of dropping hammer impact test apparatus |
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| CN110186783A true CN110186783A (en) | 2019-08-30 |
Family
ID=67715489
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| CN201910365555.9A Pending CN110186783A (en) | 2019-05-01 | 2019-05-01 | Compression shear of dropping hammer impact test apparatus |
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| CN111929181A (en) * | 2020-07-24 | 2020-11-13 | 中煤科工集团西安研究院有限公司 | Impact rock breaking mechanism test device |
| CN111982715A (en) * | 2020-08-12 | 2020-11-24 | 中机城市建设有限公司 | Building material impact resistance testing machine |
| CN112964580A (en) * | 2021-03-17 | 2021-06-15 | 哈尔滨工业大学 | Concrete tensile impact performance test device and impact test method thereof |
| CN113514217A (en) * | 2021-06-04 | 2021-10-19 | 桂林理工大学 | Testing device and testing method for simulating impact on building structure in fire |
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