KR101787999B1 - Free drop tester - Google Patents

Free drop tester Download PDF

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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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South Korea
Prior art keywords
coupled
guide member
wires
mounting plate
guide
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KR1020150182768A
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Korean (ko)
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KR20170073942A (en
Inventor
권오순
신창주
서정민
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한국해양과학기술원
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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
    • 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
    • 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
    • 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
    • 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
    • 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

Free Drop Tester {FREE DROP TESTER}

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.

Korean Patent No. 10-1098769 (Published on December 26, 2011)

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 free fall tester 10 according to the first embodiment of the present invention measures the motion of a vertical component or performs an impact test or a ground penetration test of a freely falling object A lower frame 22 having a predetermined length and a lower support 20 composed of a pair of lower support frames 24A and 24B each of which is fitted in an intermediate portion at both ends of the lower frame 22, A guide groove 32 is formed in a longitudinal direction on one surface of the lower frame 22 and vertically installed at an intermediate point of the lower frame 22 so as to guide the drop body 50 provided in the guide groove 32 to fall freely in the gravity direction An upper support body 40 which is coupled to the upper end of the guide member 30 while maintaining a horizontal state and an upper support body 40 which is coupled to both ends of the upper support body 40 and the lower support frames 24A and 24B Wires 62 connecting the respective ends, and wires 62 connected to the wires 62 And a vertical adjustment means 60 for adjusting the tension of the guide member 30 by adjusting the tension adjusters 64. The vertical adjustment means 60 includes a tension adjuster 64 for adjusting the tension of the wire 62, .

This will be described more specifically.

The lower support 20 is for supporting the lower portion of the tester 10, that is, the guide member 30 in a vertical state, and includes a lower frame 22 having a predetermined length (approximately 20 to 100 cm in length) And a pair of lower support frames 24A, 24B each having an intermediate portion joined to both ends of the frame 22 and having a predetermined length (approximately 20-100 cm in length). The lower frame 22 and each of the lower support frames 24A and 24B may be formed into a rod shape or an extruded aluminum profile as shown in FIG. It is natural that it can be formed into a structure.

 The guide member 30 is provided to be perpendicular to the above-described lower frame 22 to guide the drop body 50 so that it can fall freely only in the gravity direction without resistance. Grooves 32 are formed and vertically installed at the intermediate point of the lower frame 22. [ The guide member 30 is formed in the shape of an aluminum profile manufactured by extrusion molding and has a predetermined length (approximately 50 to 200 cm in length) and has guide grooves 32 on both sides with the support end 34 therebetween. Respectively. This is because the guide member 30 is formed of an aluminum profile because the guide groove 32 can be easily formed and can be manufactured at a low cost. However, the guide member 30 is not limited to the structure or the shape as shown in Figs. 1 and 3, and various structures that are rod-shaped with the guide groove 32 and can maintain the vertical state can be applied.

At this time, the reinforcement member 36 can be coupled to the back surface of the guide member 30. [ The reinforcing member 36 has a lower end coupled to the lower frame 22 and a remaining portion except for the lower end of the reinforcing member 36 in close contact with the rear surface of the guide member 30 to thereby complement the vertical state of the guide member 30, (22) and the guide member (30).

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 lower frame 22 and the guide member 30. [

The upper support 40 is for the installation of the vertical adjustment means 60 and is held in the horizontal state and is coupled to the upper end of the guide member 30 at the intermediate portion. The upper support 40 has a length of approximately 20-100 cm and may be formed in the form of an extruded profile or may be formed in various forms to support the wire 62 of the vertical adjustment means 60 Of course. At this time, the upper support 40 is arranged in a direction crossing the lower frame 22 (one end toward the front), and is coupled to the upper end of the guide member 30. [ This coupling direction is for pulling one end and the other end of the upper support 40 with the first and second wires 62A and 62B and the third and fourth wires 62C and 62D to correct the vertical state of the guide member 30 . That is, when the guide member 30 is not in the vertical state, the guide member 30 is vertically moved so as to correct it.

The reinforcing bars of the "nail" type can be respectively coupled to the connecting corner regions of the guide member 30 and the upper support body 40. [

The vertical adjustment means 60 adjusts the tension of the first, second, third and fourth wires 62A, 62B, 62C and 62D connecting the upper support 40 and the first and second lower support frames 24A and 24B The first and second support frames 24A and 24B are connected to the first support frame 24 and the second support frame 24A. Second, third, and fourth wires 62A, 62B, 62C, and 62D that are respectively installed on the wires 62A, 62B, 62C, and 62D and the first, second, third, and fourth wires 62A, 62C, and 62D, respectively. The tension adjuster 64 may be configured in various manners, but in the present embodiment, the tension adjuster 64 will be described based on a turnbuckle.

1, one end of the tension regulator 64 is coupled to the upper side wire 62, and the other end thereof is coupled to the lower side wire 62, as shown in FIG. Therefore, by the operation of tightening or loosening the tension regulator 64, both the wires 62 can be pulled and taut or the tension can be relieved.

The drop 50 is provided so as to be movable only in the gravity direction in the guide groove 32 of the guide member 30 and includes an acceleration sensor 56 capable of measuring the acceleration and a weight And one or more weight blocks 58 that can add and subtract. A moving member 52 having one end engaged with the guide groove 32 so as to move only in the gravity direction and the gravity opposite direction with respect to the guide member 30; An acceleration sensor 56 mounted on the mounting plate 54 and a mounting member 54 selectively coupled to the mounting plate 54 by bolts to connect the drop 50 to the mounting plate 54. [ And at least one weight block (58) for increasing or decreasing the weight of the weight block (58).

The acceleration sensor 56 is for measuring the dropping speed of the dropping body 50 when the dropping body 50 drops freely. The weighting block 58 adjusts the dropping speed by adjusting the weight of the dropping body 50, .

The weight block 58 and the acceleration sensor 56 are coupled to the mounting plate 54 by bolts or the like so that when the weight block 58 is stacked, An elongated bolt may be used to engage the top surface. That is, the length of the bolt may be varied according to the number of the weight blocks 58. The acceleration sensor 56 is coupled to the upper surface of the mounting plate 54 when there is no weight block 58, Is attached to the upper surface of the weight block (58).

The moving member 52 is configured to be fitted in the guide groove 32 formed in the guide member 30 and movable only in the vertical direction, i.e., in the gravity direction. As shown in Fig. 3, the guide groove 32 In order to be guided while being inserted into the guide grooves 32 at both ends of one end of the moving member 52 so as to surround the supporting end 34 A pair of guide ends 52A are respectively formed. Since the pair of guide ends 52A are formed as described above, stable translational movement in the vertical direction is possible.

On the upper surface of the mounting plate 54, a seating groove 54A is formed concavely. And the acceleration sensor 56 is stably seated in the seating groove 54A.

An auxiliary seating groove 58A is also formed on the upper surface of the weight block 58, respectively. An acceleration sensor 56 is selectively seated in the auxiliary seating groove 58A. That is, when the weight block 58 is not coupled to the mounting plate 54, the acceleration sensor 56 is mounted on the seating groove 54A and the weight block 58 is coupled to the mounting plate 54 The acceleration sensor 54 is mounted in the auxiliary seating groove 58A.

The acceleration sensor 56 is coupled to the mounting plate 54 or the weight block 58 by bolts or the like and the weight block 58 is stacked and attached to the mounting plate 54 by bolts or the like.

The drop impact test specimen may be coupled to the bottom surface of the mounting plate 54 by a clamp or the like and the shock test specimen may be pricked when the impact specimen is located between the first and second lower support frames 24A and 24B Price may be combined.

On the other hand, the guide member 30 is provided with an orthogonal system 70 for measuring the vertical state, and the upper support 40 is provided with a level meter 80 for measuring the horizontal state. It is possible to correct the vertical state of the guide member 30 by adjusting the vertical adjusting means 60 on the basis of the vertical system 70 and the horizontal system 80. [

The operation of the free fall tester 10 according to the present invention constructed as described above will be described.

In order to evaluate the physical properties of the material by using the free fall tester 10 according to the present invention, a test piece is fixed to the bottom surface of the mounting plate 54 of the drop body 50 with a clamp (not shown) The specimen is placed at the point where the mounting plate 54 falls.

At this time, an acceleration sensor 56 is installed on the mounting plate 54, or a weight block 58 is attached to add weight to the drop body 50. At this time, since the weight block 58 can be added or subtracted, it is possible to measure the falling speed of the drop body 50 and various impact amounts.

4, when the dropping body 50 located on the upper portion of the guide member 30 is placed, the dropping body 50 is guided in the guide groove 32 of the guide member 30 (Free fall) only in the gravity direction. In this process, the acceleration sensor 56 is guided by the guide groove 32 to measure the falling speed of the falling body 50 falling freely. Then, the impact applied to the specimen is calculated based on the falling speed of the drop 50.

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 guide member 30 installed vertically through the vertical system 70 and the horizontal system 80 is determined. If the guide member 30 is inclined to either side with respect to the vertical line, the tension adjuster 64 is operated to fix the vertical position of the guide member 30 and fix it.

For example, when the guide member 30 is inclined rearward with respect to the vertical line, the first and second wires 30A and 30B, which connect one ends of the upper support 40 and one ends of the first and second lower support frames 24A and 24B, Tightening operation of the tension adjuster (64) provided on the upper and lower frames (62A, 62B). The first and second wires 62A and 62B are tensed and the upper support body 40 is tilted in the first direction (in the direction opposite to the tilting direction - forward), and at this time, the vertical system 70 and the level system 80 are checked and the degree of pulling is controlled. In this process, since the guide member 30 inclined backward is inclined forwardly, the guide member 30 can maintain the vertical state.

On the other hand, when the guide member 30 is tilted to the left or right, the tension adjuster 64 is provided on the first and third wires 62A and 62C on the first lower support frame 24A side, 2 The tension regulator 64 provided on the second and fourth wires 62B and 62D on the lower support frame 24B side is tightened to adjust and maintain the vertical state of the guide member 30. [

The vertical state of the guide member 30 can be adjusted by operating the tension regulators 64 provided on the first, second, third and fourth wires 62A, 62B, 62C and 62D, The first, second, third, and fourth wires 62A, 62B, 62C, and 62D are tilted in four directions, and the guide members 30 So that the vertical state of the guide member 30 can be stably maintained.

5 is a side sectional view showing a free fall tester according to a second embodiment of the present invention.

The free fall tester 10 according to the second embodiment is the same as the free fall tester 10 according to the second embodiment except that a penetration fin 90 for ground penetration depth test is provided on the bottom surface of the installation plate 54 so as to test the depth of the ground penetration. For example. At this time, the upper end of the penetration pin 90 is fitted to the bottom surface of the mounting plate 54 in a state of being fitted in the reinforcing bracket 92. That is, a bolt penetrating downward from the upper surface of the mounting plate 54 is fastened to the upper end of the penetration pin 90 through the reinforcing bracket 92 to which the upper end of the penetration fin 90 is inserted. The reinforcing bracket 92 serves to support the upper end of the penetration fin 90 so that the joint portion with the bolt is not damaged or deformed by the load due to the penetration of the penetration fin 90 into the ground.

A receiver 94 may be provided between the first and second lower support frames 24A and 24B to receive the sand or soil for the penetration of the penetration pin 90 have. If the receptacle 94 is not provided, the tester 10 may be seated in the field so that the penetration pin 90 is directly penetrated to the ground. In the case where the receiver 94 is provided, it is possible to test the depth of penetration by receiving the soil or the similar soil in the field 94, The penetration depth test of the ground becomes possible.

At this time, the weight of the drop body 50 can be adjusted by adding or removing the weight block 58 to the mounting plate 54.

The operation of the free fall tester 10 according to the second embodiment constructed as described above will be described.

 If the drop body 50 is allowed to fall freely while the receiver 94 is provided with sand or soil and the penetration pin 90 is provided in the gravity direction on the bottom surface of the drop body 50, 50 is penetrated into the soil contained in the receptacle 94. The lower end of the penetration pin 90,

By this process, the environment of the ground can be judged based on the depth of the penetration fin 90 penetrated into the soil.

For example, if a free fall is made at a height apart by a unit length (an arbitrary length), the penetration pin 90 is brought into contact with the soil simulating the ground accommodated in the receptor 94 and penetrated into the ground for a predetermined length, , The amount of energy until reaching the ground can be obtained arithmetically and the resistance of the part (soil) simulating the ground can be known through the cross-sectional area and depth of penetration of the fin. It is possible to grasp the hardness of the wafer.

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: lower frame 24A: first lower support frame
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: weight block 58A: auxiliary seat groove
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)

A lower support having a lower frame having a predetermined length and a pair of first and second lower support frames coupled to both ends of the lower frame;
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. delete delete delete The method according to claim 1,
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. delete The method according to claim 1,
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. delete 8. The method of claim 7,
Wherein the tension regulator comprises:
Characterized by comprising a turnbuckle,
Free fall tester.



KR1020150182768A 2015-12-21 2015-12-21 Free drop tester KR101787999B1 (en)

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KR101787999B1 true KR101787999B1 (en) 2017-11-15

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KR20220016722A (en) 2020-08-03 2022-02-10 한국해양과학기술원 Free fall type penetration tester for underwater

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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

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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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