KR101787999B1 - Free drop tester - Google Patents
Free drop tester Download PDFInfo
- Publication number
- KR101787999B1 KR101787999B1 KR1020150182768A KR20150182768A KR101787999B1 KR 101787999 B1 KR101787999 B1 KR 101787999B1 KR 1020150182768 A KR1020150182768 A KR 1020150182768A KR 20150182768 A KR20150182768 A KR 20150182768A KR 101787999 B1 KR101787999 B1 KR 101787999B1
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- KR
- South Korea
- Prior art keywords
- coupled
- guide member
- wires
- mounting plate
- guide
- Prior art date
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
- F16G11/12—Connections or attachments, e.g. turnbuckles, adapted for straining of cables, ropes, or wire
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
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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
- G01N2203/0033—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
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
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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
- G01N2203/0284—Bulk material, e.g. powders
-
- 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 Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pathology (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A free fall tester is started. The free fall tester according to the present invention comprises a lower frame having a lower frame having a predetermined length and a pair of first and second lower frames coupled to both ends of the lower frame; A guide member for guiding the drop body provided in the guide groove so as to fall freely in the gravity direction, the guide member being formed at one side thereof with a guide groove in the longitudinal direction and vertically installed at an intermediate point of the lower frame; An upper support which is coupled to an upper end of the guide member while maintaining a horizontal state; And wires connected to both ends of the upper support and each end of the lower support frame, and tension adjusters respectively installed on the wires to adjust the tension of the wires, And vertical adjustment means for adjusting the vertical state of the member. According to the present invention, not only an accurate impact test can be performed by dropping a drop body provided with an acceleration sensor with minimum resistance in a vertical direction and stably falling free, but also by attaching a penetration pin to the bottom surface of a drop body, It is possible to provide a measurable effect.
Description
The present invention relates to a free fall tester, and more particularly, to a free fall tester capable of stably dropping a drop body provided with an acceleration sensor without resistance in a gravity direction so as to perform various impact tests, The present invention relates to a free fall tester capable of measuring the depth of penetration into the ground.
Impact testers generally use Charpy Impact Tester, Hickinson Impact Tester, free fall impact tester, and rain gun depending on the impact test subject and test conditions. These impact testers are used for low shock test Speed impact test. The purpose of the impact test is to obtain the impact properties of the material and to evaluate the impact safety of the product.
Particularly, in case of the free fall impact tester, it is relatively easy to apply, the weight of the falling object can be changed, and when the height of the falling object is adjusted, there is a strong point that the impact that can be applied to the product can be controlled. It is one of the impact tester which can be implemented and widely applied.
As a prior art, a composite drop tester is disclosed in Korean Patent No. 10-1098769 (Published on December 24, 2011). The dropping tester is configured such that a guide is provided on a supporting base of a vertically installed body, the clamping means is movably coupled to the guide in a vertical direction, and the dropping tester is configured to drop while the test object is fixed to the clamping means. The strength of the collided portion can be measured by dropping the test object at a constant height and colliding with the ground by setting the collision portion of the test object arbitrarily.
However, in the falling tester according to the related art, since the supporting table is vertically fixed to the lower supporting table, the supporting table can maintain the right angle with respect to the supporting table, but it is difficult to correct the supporting table when it is not perpendicular to the supporting table. In other words, the clamping means can fall without resistance only when the support is held at right angles to the pedestal. However, when the support is inclined beyond the right angle, the clamping means falls and rubs against the guide, There is a problem that an accurate drop test can not be performed.
In addition, since the drop test apparatus according to the prior art having such a structure is configured to simply drop the fallen objects onto the pedestal, there is a problem that it is impossible to perform a test for measuring the depth of penetration for the ground.
It is an object of the present invention to provide an acceleration sensor capable of accurately performing an impact test by dropping a falling object provided with an acceleration sensor in a vertical direction with a minimum of resistance and stably falling down and freely measuring a penetration depth with respect to the ground by attaching a penetration pin to the falling object Drop testing machine.
The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to at least partially solve the problems in the conventional arts. It can be understood.
According to the present invention, the above object can be achieved by a lower support comprising a lower frame having a predetermined length and a pair of lower support frames each having an intermediate portion joined to both ends of the lower frame; A guide member for guiding the drop body provided in the guide groove so as to fall freely in the gravity direction, the guide member being formed at one side thereof with a guide groove in the longitudinal direction and vertically installed at an intermediate point of the lower frame; An upper support which is coupled to an upper end of the guide member while maintaining a horizontal state; And wires connected to both ends of the upper support and each end of the first and second lower support frames and tension adjusters respectively installed on the wires to adjust the tension of the wires, And vertical adjusting means for adjusting the vertical state of the guide member by adjusting the vertical movement of the guide member.
Wherein the drop body comprises: a moving member coupled to the guide groove so as to move in the gravity direction and the gravity opposite direction with respect to the guide member; A mounting plate whose one end is coupled to the front surface of the moving member in a horizontal state; An acceleration sensor installed on the mounting plate; And at least one weight block for selectively increasing or decreasing the weight of the drop body.
An acceleration sensor is mounted on the seating groove when the weight block is not coupled to the mounting plate, and the acceleration sensor is mounted on the seating groove, When the weight block is coupled to the mounting plate, the acceleration sensor may be installed in the auxiliary seating groove.
The bottom of the mounting plate is provided with a penetration fin for the ground penetration depth test, and the upper end of the penetration fin is fitted to the bottom surface of the mounting plate in a state of being fitted in the reinforcing bracket.
A receiver may be provided between the lower support frames to receive sand or soil for the penetration of the penetration pins.
The guide groove may be formed on both sides of the support end, and a pair of guide ends may be respectively formed at one end of the guide member to be inserted into the guide grooves on both sides of the guide member, have.
Wherein the guide member is provided with an orthogonal system for measuring a vertical state, a leveling instrument for measuring a horizontal state is installed on the upper support, and the vertical adjustment means is operated on the basis of the vertical system and the vertical system, As shown in FIG.
The tension regulator may comprise a turnbuckle.
The wire may include first and second wires each having one end connected to one end of the upper support and the other end coupled to one end of each of the first and second lower support frames; And third and fourth wires each having one end connected to the other end of the upper support and the other end coupled to the other end of the first and second lower support frames, And the tension adjusters may be respectively installed on the 3,4 wires.
According to the present invention, not only an accurate impact test can be performed by dropping a drop body provided with an acceleration sensor with minimum resistance in a vertical direction and stably falling free, but also by attaching a penetration pin to the bottom surface of a drop body, It is possible to provide a measurable effect.
1 is an exploded perspective view showing a free fall tester according to a first embodiment of the present invention.
Fig. 2 is a perspective view of the free fall tester shown in Fig. 1 in a coupled state.
3 is a sectional view taken along the line AA in Fig.
4 is a sectional view taken along line BB of Fig.
5 is a side sectional view showing a free fall tester according to a second embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.
1 is an exploded perspective view showing a free fall tester according to a first embodiment of the present invention. FIG. 2 is a perspective view of the free fall tester shown in FIG. 1, 4 is a cross-sectional view taken along the line BB of Fig. 2; Fig.
As shown in Figs. 1 to 4, the
This will be described more specifically.
The
The
At this time, the
Further, although not shown in the drawings, a reinforcing bar of the "nail" type can be respectively coupled to the connecting corner region of the
The
The reinforcing bars of the "nail" type can be respectively coupled to the connecting corner regions of the
The vertical adjustment means 60 adjusts the tension of the first, second, third and
1, one end of the
The
The
The
The moving
On the upper surface of the mounting
An
The
The drop impact test specimen may be coupled to the bottom surface of the mounting
On the other hand, the
The operation of the
In order to evaluate the physical properties of the material by using the
At this time, an
4, when the dropping
At this time, if the free fall falls vertically at a height apart by a unit length (arbitrary length) in the case of the falling speed, the time taken to reach the ground, an arbitrary length, and an acceleration value can be obtained. The performance of the accelerometer can be verified by comparing it with the value calculated according to distance-time, and the amount of impact according to arbitrary height can also be calculated arithmetically.
Meanwhile, the vertical state of the
For example, when the
On the other hand, when the
The vertical state of the
5 is a side sectional view showing a free fall tester according to a second embodiment of the present invention.
The
A
At this time, the weight of the
The operation of the
If the
By this process, the environment of the ground can be judged based on the depth of the
For example, if a free fall is made at a height apart by a unit length (an arbitrary length), the
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it should be understood that such modifications or alterations should not be understood individually from the technical spirit and viewpoint of the present invention, and that modified embodiments fall within the scope of the claims of the present invention.
10: Tester 20: Lower support
22:
24B: second lower support frame 30: guide member
32: guide groove 34: support end
40: upper support 50:
52: moving member 54: mounting plate
54A: seat groove 56: acceleration sensor
58:
60: Vertical adjustment means 62A, 62B, 62C, 62D: 1st, 2nd, 3rd and 4th wires
64: tension regulator 70:
80: Level gauge 90: Penetration pin
92: Reinforcing bracket 94: Receptor
Claims (9)
An aluminum profile guiding member formed on one surface of the guiding groove in the longitudinal direction and vertically installed at an intermediate point of the lower frame and guiding the dropping body installed in the guiding groove so as to fall freely in the gravity direction;
An upper support which is coupled to an upper end of the guide member while maintaining a horizontal state; And
And wires connected to both ends of the upper support and each end of the first and second lower support frames and tension adjusters respectively installed on the wires to adjust the tension of the wires, And vertical adjusting means for correcting the vertical state of the guide member,
On the back surface of the guide member,
A lower end of the reinforcing member is coupled to the lower frame and a remaining portion of the reinforcing member except for the lower end is closely attached to the back surface of the guide member,
Each of the guide grooves is formed on both sides with a support end interposed therebetween. One end of the movable member is formed with a pair of guide ends inserted into the guide grooves on both sides so as to be guided while guiding the support end ,
Wherein the drop body comprises:
A moving member coupled to the guide groove to move in the gravity direction and the gravity opposite direction with respect to the guide member; A mounting plate whose one end is coupled to the front surface of the moving member in a horizontal state; An acceleration sensor installed on the mounting plate; And at least one weight block selectively attached to the mounting plate to increase or decrease the weight of the drop body,
Wherein an acceleration sensor is mounted on the seating groove when the weight block is not coupled to the mounting plate, and the acceleration sensor is mounted on the seating groove, When the weight block is coupled to the mounting plate, the acceleration sensor is seated in the auxiliary seating groove,
On the bottom surface of the mounting plate,
A penetration fin for the depth penetration test is installed, and an upper end of the penetration fin is fitted to a bottom surface of the mounting plate in a state of being fitted in the reinforcing bracket,
Wherein the guide member is provided with an orthogonal system for measuring a vertical state and a horizontal system for measuring the horizontal state is installed on the upper support body and the vertical adjustment means is operated on the basis of the vertical system and the vertical system, . ≪ / RTI >
Free fall tester.
Between the first and second lower support frames,
Characterized in that a receptacle is provided for receiving sand or soil for penetration of the penetration pin.
Free fall tester.
The wire
First and second wires each having one end coupled to one end of the upper support and the other end coupled to one end of each of the first and second lower support frames; And
And third and fourth wires each having one end connected to the other end of the upper support and the other end connected to the other end of each of the first and second lower support frames,
And the tension adjusters are installed on the first, second, third, and fourth wires, respectively.
Free fall tester.
Wherein the tension regulator comprises:
Characterized by comprising a turnbuckle,
Free fall tester.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020150182768A KR101787999B1 (en) | 2015-12-21 | 2015-12-21 | Free drop tester |
Applications Claiming Priority (1)
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KR1020150182768A KR101787999B1 (en) | 2015-12-21 | 2015-12-21 | Free drop tester |
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KR20170073942A KR20170073942A (en) | 2017-06-29 |
KR101787999B1 true KR101787999B1 (en) | 2017-11-15 |
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KR1020150182768A KR101787999B1 (en) | 2015-12-21 | 2015-12-21 | Free drop tester |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20220016722A (en) | 2020-08-03 | 2022-02-10 | 한국해양과학기술원 | Free fall type penetration tester for underwater |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108375506A (en) * | 2018-04-24 | 2018-08-07 | 浙江大学 | The experimental rig of the vertical load of fixed eccentric compression concrete column |
KR102358526B1 (en) * | 2020-08-04 | 2022-02-11 | 주식회사 푸른종합건설 | Canti-lever type Multi-purpose Mini Gantry Crane |
KR102344381B1 (en) * | 2020-08-19 | 2021-12-27 | 한국해양과학기술원 | Seabed Penetration System and Estimation Method for Penetration Depth |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR200258613Y1 (en) * | 2001-10-09 | 2001-12-29 | 주식회사 건화 이앤아이 | fixing device for prevention of electric pole slant |
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2015
- 2015-12-21 KR KR1020150182768A patent/KR101787999B1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR200258613Y1 (en) * | 2001-10-09 | 2001-12-29 | 주식회사 건화 이앤아이 | fixing device for prevention of electric pole slant |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20220016722A (en) | 2020-08-03 | 2022-02-10 | 한국해양과학기술원 | Free fall type penetration tester for underwater |
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KR20170073942A (en) | 2017-06-29 |
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