CN101738348B - Drop hammer type shock test bench controlled by magnetic switch - Google Patents
Drop hammer type shock test bench controlled by magnetic switch Download PDFInfo
- Publication number
- CN101738348B CN101738348B CN2009102490714A CN200910249071A CN101738348B CN 101738348 B CN101738348 B CN 101738348B CN 2009102490714 A CN2009102490714 A CN 2009102490714A CN 200910249071 A CN200910249071 A CN 200910249071A CN 101738348 B CN101738348 B CN 101738348B
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- magnetic switch
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- shock
- impact
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- Expired - Fee Related
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- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 230000035939 shock Effects 0.000 title claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 8
- 230000003116 impacting effect Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a drop hammer type shock test bench controlled by a magnetic switch, belongs to the technical field of civil engineering, and relates to a fiber concrete shock-resistance property test device. The device is characterized in that a shock rack is vertically welded to a bottom plate; a positioning cantilever is connected with the shock rack through a movable bolt, and the height is freely adjusted; the magnetic switch is connected with the positioning cantilever through a movable bolt, and the position is accurately adjusted. The free falling of the shock hammer is ensured, and the protecting device is clamped around four iron baffle plates on the bottom plate through square sleeves, thus the edge conditions of a test piece during shocking are same, and simultaneously the safety of the operators is ensured. The invention has the advantages of obvious enhancement of shock test accuracy, wide application, simple structure, easy operation, convenient carrying and enhancement of test safety.
Description
Technical field
The invention belongs to technical field of civil engineering, relate to a kind of fiber concrete impact resistance test device, specially refer to drop hammer type shock test bench controlled by magnetic switch.
Background technology
Fiber concrete can improve mechanical properties of concrete and permanance, is widely used in building structure and the Tunnel Engineering, and development prospect is very optimistic.At present, the experimental provision that drops hammer that known fiber concrete shock resistance proving installation has the ACI544 council to recommend, China the similar of experimental provision and ACI544 council recommendation of dropping hammer.When using this device to test, need manually the steel ram hammer to be lifted specified altitude assignment and aimed at test specimen, loosen both hands then and make ram hammer fall concrete sample is impacted.The hammer location will inevitably produce deviation owing to liquidate manually, the height of ram hammer is constant in the time of can not guaranteeing to impact at every turn, can't guarantee that also the center of gravity trace when ram hammer falls at every turn passes the center of gravity of impacting ball, even initial velocity and initial acceleration can have influence on ram hammer and fall the time, thereby bring adverse influence can for the accuracy of test; Simultaneously,, cause ram hammer bounce-back back to fall test specimen is caused irregular impact for the second time, do not realize the consistance of each impact owing to do not have suitable protective device behind the ram hammer impact test piece.In addition, lack protective device and make ram hammer injure testing crew easily by a crashing object, exist can not support personnel's safety drawback.
The sample dimensions that experimental provision adopted of dropping hammer that the ACI544 council is recommended is that diameter is 150mm, and thickness is the patty test specimen of 63mm ± 3mm.Behind the new structure type long fibre that adds 50mm~65mm in the concrete, fiber is 150mm at diameter, thickness is to have certain orientation trend near the patty die trial limit wall of 63mm ± 3mm, forms " wall effect ", can't truly reflect the shock resistance of this kind fiber concrete material.
Summary of the invention
It is more accurate that the technical problem to be solved in the present invention provides a kind of impulse test that makes; the scope of application is more extensive; in light weight; be easy to carry; can protect operator safety; easy and simple to handle; the impact test apparatus that is particularly useful for domestic different building ground; thereby not only solved the initial height of drop that operation manually causes; initial velocity; the inconsistent problem of boundary condition when initial acceleration variation and each impulse test; solved center of gravity trace when ram hammer falls at every turn and can not pass a difficult problem of impacting the ball center of gravity, and solved the problem of " wall effect " that testing crew safety and long fibre exist in the concrete die trial.
Technical scheme of the present invention is:
Before carrying out impulse test, at first base plate 9 usefulness expansion bolts are fixed on the rigid foundation, adjust location cantilever 3 then to desired height, be fixed on the impact frame 2 that is connected with base plate 9 with movable bolt.Utilize plummet with magnetic switch 1 and impact ball 6 centerings, the center of gravity trace the when ram hammer 4 that makes magnetic switch 1 adsorb falls at every turn passes the center of gravity of impacting ball 6.And the square sleeve of protective device 5 by the lower part be stuck on four outer baffle plates 8 of concrete sample 7, promptly finished fixing to protective device 5.
When carrying out impulse test; open magnetic switch 1; ram hammer 4 is adsorbed on the magnetic switch 1 of location; close magnetic switch 1; absorption affinity disappears, and ram hammer 4 is done the movement of falling object under the effect of self gravitation, impacts the impact ball 6 that is placed on the test specimen end face; ram hammer 4 drops in the protective device 5 after finishing one-shot, whenever finishes one-shot and is a circulation.
When adopting fiber concrete, for the fiber of 30~50mm length, the employing diameter is 150mm, and thickness is the patty test specimen of 75mm; For the fiber of 50mm~65mm length, the employing diameter is 200mm, and thickness is the patty test specimen of 75mm.
Effect of the present invention and benefit are:
The present invention positions with the magnetic switch hammer that liquidates, and testing crew only need be controlled magnetic switch and can test, and has solved and has located inaccurate problem manually, guarantees that the initial falling speed perseverance of ram hammer is zero; Protective device makes the secondary pulse rule unanimity of ram hammer to test specimen.Magnetic switch and protective device have constant boundary condition when test specimen is hit, improved the accuracy of impulse test significantly.But protective device is protection test personnel's safety also.The present invention also has in light weight, is easy to carry; Need not any energy that orders about, environmental protection; Characteristics easy and simple to handle.And the scope of application is more extensive, is applicable to the research of the shock resistance of structural type long fibre concrete material when fibre length 30~65mm.In addition, in various places, especially the working-yard provides guarantee for carrying out high-quality impulse test easily.
Description of drawings
Accompanying drawing 1 is the structural representation of drop hammer type shock test bench controlled by magnetic switch.
Accompanying drawing 2 is A-A planimetric maps of drop hammer type shock test bench controlled by magnetic switch.
Among the figure: 1 magnetic switch; 2 impact frame; 3 location cantilevers; 4 ram hammers; 5 protective devices; 6 impact ball; 7 test specimens; 8 baffle plates; 9 base plates; 10 square sleeves.
Embodiment
Be described in detail concrete implementation step of the present invention below in conjunction with technical scheme and accompanying drawing.
Step 1. is fixed on the base plate 9 of the experimental provision mode by the expansion bolt anchoring on the rigid foundation.
Claims (1)
1. a drop hammer type shock test bench controlled by magnetic switch comprises magnetic switch (1), impact frame (2), location cantilever (3), ram hammer (4), protective device (5), impacts ball (6), test specimen (7), baffle plate (8) and base plate (9); It is characterized in that: the structure of this magnetic switch control drop hammer type shock test device is that steel base plate (9) is fixed on the rigid foundation by expansion bolt; Impact frame (2) and the vertical welding of base plate (9); Location cantilever (3) is connected by first movable bolt with impact frame (2), and freely adjusts height along impacting frame; Magnetic switch (1) is connected by second movable bolt with location cantilever (3); The magnetic switch (1) that utilization is fixed on the location cantilever (3) is located ram hammer (4), and ram hammer (4) is adsorbed on the magnetic switch (1); And utilize the release of magnetic switch (1) control ram hammer (4), and guarantee that it does the movement of falling object during drop impact down at every turn, guarantee that simultaneously center of gravity trace that ram hammer (4) falls is by impacting the center of gravity of ball (6); Impact the geometric center place that ball (6) is positioned over test specimen (7) upper surface; Protective device (5) is made of two parts up and down, top is designed to funnel, the lower part is designed to square sleeve (10), two parts weld by steel pole up and down, protective device (5) by square sleeve (10) be stuck in the last four steel baffle plates of base plate (9) (8) around, make the boundary condition of test specimen (7) when being hit identical; The protective device of setting up (5) makes the secondary pulse rule unanimity of ram hammer to test specimen (7), simultaneously the warranty test operator safety.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN2009102490714A CN101738348B (en) | 2009-12-31 | 2009-12-31 | Drop hammer type shock test bench controlled by magnetic switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN2009102490714A CN101738348B (en) | 2009-12-31 | 2009-12-31 | Drop hammer type shock test bench controlled by magnetic switch |
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CN101738348A CN101738348A (en) | 2010-06-16 |
CN101738348B true CN101738348B (en) | 2011-08-24 |
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CN2009102490714A Expired - Fee Related CN101738348B (en) | 2009-12-31 | 2009-12-31 | Drop hammer type shock test bench controlled by magnetic switch |
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- 2009-12-31 CN CN2009102490714A patent/CN101738348B/en not_active Expired - Fee Related
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Granted publication date: 20110824 Termination date: 20191231 |