KR20170029122A - Residual impact energy absorption structure for heavy weight drop tester - Google Patents

Residual impact energy absorption structure for heavy weight drop tester Download PDF

Info

Publication number
KR20170029122A
KR20170029122A KR1020150126041A KR20150126041A KR20170029122A KR 20170029122 A KR20170029122 A KR 20170029122A KR 1020150126041 A KR1020150126041 A KR 1020150126041A KR 20150126041 A KR20150126041 A KR 20150126041A KR 20170029122 A KR20170029122 A KR 20170029122A
Authority
KR
South Korea
Prior art keywords
support
lower member
impact energy
energy absorbing
absorbing structure
Prior art date
Application number
KR1020150126041A
Other languages
Korean (ko)
Other versions
KR101763476B1 (en
Inventor
이재욱
조정우
정명식
이상곤
조용재
강훈
장진석
Original Assignee
한국생산기술연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국생산기술연구원 filed Critical 한국생산기술연구원
Priority to KR1020150126041A priority Critical patent/KR101763476B1/en
Publication of KR20170029122A publication Critical patent/KR20170029122A/en
Application granted granted Critical
Publication of KR101763476B1 publication Critical patent/KR101763476B1/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/08—Shock-testing
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • 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

Abstract

The present invention relates to an impact absorption structure installed in a base portion of a drop tester, comprising: a lower supporter which comes in contact with a base portion; an upper supporter positioned to be separated from the lower supporter; and a plurality of support legs which extend up and down, and connect the lower supporter to the upper supporter. The support leg includes a lower member which extends upward from the lower supporter and has a hollow shape with an upper end opened, and an upper member which extends downwards from the upper supporter has a lower end inserted through the opened upper end of the lower member and coupled to the lower member. The upper member includes an inclination portion having an inclined outer peripheral surface since its outer diameter gets smaller and thinner towards the lower end. The maximum diameter of the inclination portion is greater than an inner diameter of the lower member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a residual impact energy absorbing structure for a heavy-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drop testing machine, and more particularly, to a residual impact energy absorbing structure used in a heavy duty drop testing machine.

The dropping tester is a device for dropping a test object to test the impact reliability of the test object against drop impact, and has a collision portion that collides with the test object. The impact generated when the test object impacts the impact portion is also transmitted to the drop testing device. If the test object is light, the impact is not a problem because the impact is small. However, when the test object is heavy, If delivered as is, the drop tester may be damaged. Accordingly, the high-weight drop testing machine needs to be equipped with a means for absorbing the residual impact energy after the impact test. In the prior art, there is no shock absorbing means suitable for the heavy-weight drop testing machine.

EP 2 669 652 A1 "Automatic drop tester" (2013.12.04) Korean Registered Patent Publication No. 10-0480053 "Drop Test Apparatus for Mobile Terminals" (Mar. 30, 2005)

It is an object of the present invention to provide a residual impact energy absorbing structure suitable for use in a heavy duty drop testing machine.

According to an aspect of the present invention,

An impact absorbing structure provided on a base portion of a drop testing machine, the impact absorbing structure comprising: a lower support portion in contact with the base portion; An upper support positioned to be spaced above the lower support; And a plurality of support legs extending vertically so as to connect the lower support and the upper support, the support legs having a hollow lower member extending upward from the lower support and having an open top, And an upper member inserted into the lower member through a lower end of the lower member so as to be engaged with the lower member. The upper member has an inclined portion having an inclined outer circumferential surface with an outer diameter reduced to be tapered toward the lower end , And the maximum diameter of the inclined portion is larger than the inner diameter of the lower member.

The inclined portion may be press-fitted into the upper end of the lower member so that the lower member and the upper member can be engaged.

The upper member may further include an insertion portion extending from a lower end to a lower end of the inclined portion, and the insertion portion may be inserted into the lower member so that the lower member and the upper member may be engaged.

The upper member may be solid.

According to the present invention, all of the objects of the present invention described above can be achieved. Specifically, since the residual impact energy absorbing structure is inserted into the lower member and the lower member and includes the support leg having the upper member having the inclined portion which moves while expanding the lower member at the time of collision, The deformation of the member and the frictional dissipation of the upper member and the lower member can be effectively absorbed.

1 is a view showing a schematic configuration of a heavy-weight drop test machine having a residual impact energy absorbing structure according to an embodiment of the present invention.
2 is a perspective view of the residual impact energy absorbing structure shown in FIG.
3 and 4 each show a state before and after the collision of the support legs in the residual impact energy absorbing structure shown in Fig. 2, and Fig. 5 shows the deformation of the lower member occurring in the collision process step by step .
FIG. 6 is a graph showing the result of impact absorption analysis by the residual impact energy absorbing structure shown in FIG. 2. FIG.
FIG. 7 is a graph showing the result that the initial impact energy shown in FIG. 6 is absorbed by both the deformation energy and the frictional dissipation, and the initial impact energy is absorbed.
FIG. 8 is a perspective view showing another residual impact energy absorbing structure which is a comparative example of the residual impact energy absorbing structure shown in FIG. 2. FIG.
9 is a graph showing the results of the impact absorption analysis by the residual impact energy absorbing structure shown in FIG.
10 is a cross-sectional view showing a support leg according to another embodiment of the present invention.

Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1 schematically shows a configuration of a heavy-weight drop test machine having a residual impact energy absorbing structure according to an embodiment of the present invention. 1, the heavy-weight drop testing machine 10 includes a base 11, a plurality of pillars 12 extending upward from the base 11, and a ceiling portion 13 A conveying device 14 installed on the ceiling portion 13 for conveying the test object A connected to the wire 15 to a predetermined height and a movement guide 16 for guiding the up and down movement of the test object A , The residual impact energy due to the fall of the test object (A) after the collision with the primary impact structure (19) and the primary impact structure (19) which first collides with the falling test object (A) To the base (11). 1 is one example for illustrating the residual impact energy absorbing structure 100 according to an embodiment of the present invention and is not limited to the configuration as shown, The energy absorbing structure 100 is similarly installed and used in a drop testing machine 10 of another configuration commonly used, and this is also within the scope of the present invention. All types of drop tester provided with the residual impact energy absorbing structure according to the present invention are also within the scope of the present invention. Now, the residual impact energy absorbing structure 100 according to one embodiment of the present invention will be described in detail.

Fig. 2 is a perspective view of the residual impact energy absorbing structure 100 for the heavy duty drop tester shown in Fig. Referring to FIGS. 1 and 2, the residual impact energy absorbing structure 100 includes a lower support 110, an upper support 120, and a plurality of support legs 130. The residual impact energy absorbing structure 100 is provided on the base portion 11 of the heavy weight drop testing machine 100 and is provided with a shock generated by collision with the falling test object A and transmitted to the base portion 11 .

The lower support 110 is generally in the form of a plate, and is disposed on the upper surface of the base 11. The lower support 110 is preferably detachably coupled to the base 11, but may alternatively be simply resting on the top of the base 11. [ The lower ends of each of the four support legs 130 are fixed to each of the four points corresponding to four vertexes of a substantially square shape on the upper surface of the lower support 110. [ The primary collision structure 19 is installed at the center of the upper surface of the lower support 110.

The upper support 120 is generally in the form of a plate, and is located at a distance above the lower support 110 of the logo even when facing the lower support 110. The upper surface of the upper supporter 120 is formed as a shock surface which collides with the falling test object A to generate an impact, and is generally horizontal. The upper ends of each of four support legs 130 are fixed to each of the four points corresponding to the four vertexes of the substantially square at the lower surface of the upper support 120. An opening 121 is provided at the center of the upper support 120 and the upper portion of the primary impact structure 19 protrudes upward through the opening 121. The upper portion of the primary impact structure 19 is formed in the shape of a corrugated pipe and is plastically deformed so as to reduce the length of the collision with the test object A. The test object A collides with the upper support 120 after collision with the primary impact structure 19. [ The primary impact structure 19 may be comprised in the residual impact energy absorbing structure 100.

Each of the support legs 130 is four, and each of the support legs 130 is elongated along the vertical direction so that the lower end and the upper end are fixed to the lower support base 110 and the upper support base 120, respectively. Four support legs 130 are located at points corresponding to the four vertices of a generally square. The four support legs 130 all have the same configuration.

The support leg 130 includes a lower member 131 extending upward from the lower support 110 and an upper member 135 extending downward from the upper support 120 and coupled to the lower member 131 Respectively. The impact transmitted to the base portion 11 is reduced by the plastic deformation occurring at the portion where the lower member 131 and the upper member 135 are engaged and the impact absorbing action due to the friction at the time of the collision. 3 is a cross-sectional view of a state where the lower member 131 and the upper member 135 are engaged before the collision. Hereinafter, the configuration of the lower member 131 and the upper member 135 will be described in detail with reference to FIGS. 2 and 3. FIG.

Referring to FIGS. 2 and 3, the lower member 131 is a hollow member having a circular cross-sectional shape, which is elongated straight in the vertical direction. The lower end of the lower member 131 is fixed to the upper surface of the lower support 110. The upper end of the lower member 131 is opened to form the opening 132. The lower end of the upper member 135 is inserted into the lower member 131 to a certain depth through the opened upper end of the lower member 131 so that the upper portion of the lower member 131 and the lower portion of the upper member 135 are engaged.

2 and 3, the upper member 135 is a solid-shaped member having a circular cross section and extending straight in a vertical direction. The upper end of the upper member 135 is fixed to the lower surface of the upper support 120. The upper member 135 has an inclined portion 136 having an inclined outer circumferential surface with a smaller outer diameter so as to be tapered toward the lower end (in a direction away from the upper support 120). The diameter D1 of the lower end of the inclined portion 136 is smaller than the inner diameter D2 of the lower member 131 and the diameter D3 of the upper end of the inclined portion 136 is smaller than the inner diameter D2 of the lower member 131. [ Lt; / RTI > Prior to the collision, as shown in Fig. 3, the inclined portion 136 is press-fitted into the lower member 131 and remains engaged.

When the test object (A in FIG. 1) falls and collides with the upper support 120 in a state where the lower member 131 and the upper member 135 before the impact are combined as shown in FIG. 3, The inclined portion 136 pushes downward a certain distance downward while expanding the inner diameter of the lower member 131 in the lower member 131, and then stops in a state as shown in FIG. The impact is absorbed by the plastic deformation of the lower member 131 and the friction between the lower member 131 and the upper member 135 that occur in this process. FIG. 5 is a stepwise view showing the deformation state of the lower member generated in the collision process. It is preferable that the upper member 131 and the lower member 135 are made of a general steel material having a high elongation, because it is advantageous in terms of energy absorption. Further, the energy absorption amount can be appropriately adjusted according to the inclination angle of the inclined portion 136 and the diameter of the upper and lower members 131 and 135.

FIG. 6 is a graph showing the result of the impact absorption analysis by the residual impact energy absorbing structure shown in FIG. This is a case where a striker in the form of a flat plate having a weight of 4.75 tons fell and collided with the upper support 120 at a speed of 14 m / s using Abaqus / Explicit. It shows the change of the impact force according to the passing time. Referring to FIG. 6, the instantaneous maximum impact force transmitted to the base 11 is 488 tons. Fig. 7 shows the result that the initial impact energy shown in Fig. 6 is absorbed by both the deformation energy and the frictional dissipation, so that all of the initial impact energy is absorbed.

Fig. 8 shows another residual impact energy absorbing structure as a comparative example of the residual impact energy absorbing structure shown in Fig. 2 as a perspective view. Referring to Fig. 8, the residual impact energy absorbing structure 20 according to the comparative example is a cube having a length of 3 m, which is made of a steel plate.

FIG. 9 is a graph showing the results of the impact absorption analysis by the residual impact energy absorbing structure shown in FIG. This is the same as in the case of Fig. 6 (when the striker in the form of a flat plate having a weight of 4.75 tons falls and collides with the upper surface of the residual impact energy absorbing structure 20 at a speed of 14 m / s is referred to as Abaqus / Explicit), and shows the change in the impact force with time transmitted to the base 11. Referring to FIG. 9, the instantaneous maximum impact force transmitted to the base 11 is about 1400 tons. 6 and 9, the residual impact energy absorbing structure 100 according to an embodiment of the present invention shown in FIG. 2 is more flexible than the residual impact energy absorbing structure 20 according to the comparative example shown in FIG. 8 It is confirmed that the impact force transmitted to the base plate 11 is greatly reduced.

10 is a cross-sectional view of a portion of a support leg in accordance with another embodiment of the present invention. Referring to FIG. 10, the support leg 230 according to another embodiment of the present invention includes a lower member 231 and an upper member 235.

The lower member 231 is a hollow member having a circular cross section and extending straight in the vertical direction. The lower end of the lower member 231 is fixed to the upper surface of the lower support (110 in Fig. 2). The upper end of the lower member 231 is opened to form the opening 232.

The upper member 235 is a solid member having a circular cross section and extending straight in the vertical direction. The upper end of the upper member 235 is fixed to the lower surface of the upper support (120 in Fig. 2). The upper member 235 has an inclined portion 236 having an inclined outer circumferential surface with a smaller outer diameter so as to be tapered toward the lower end side (in a direction away from the upper support 120) And an insertion portion 237 extending therefrom. The diameter of the insertion portion 237 is determined such that the insertion portion 237 is inserted into the inside of the lower member 231 through the opening 232 of the lower member 231. The insertion portion 237 is inserted into the lower member 231 so that the lower member 231 and the upper member 235 are coupled to each other and the slope portion 236 of the upper member 235 is directly above the upper end of the lower member 231 ). 8, and after the collision, the inclined portion 236 pushes down a certain distance downward while expanding the inner diameter of the lower member 231, and the lower member 231, which is generated in this process, The plastic deformation of the lower member 231 and the friction between the lower member 231 and the upper member 235 absorb the impact.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

10: High-weight drop testing machine 11:
12: column 13: ceiling
14: Feeder 16: Movement guide
100: residual impact energy absorbing structure 110: lower support
120: upper support plate 130: support leg
131: lower member 135: upper member
136:

Claims (6)

A residual impact energy absorbing structure installed and used on a base portion of a drop testing machine,
A lower support contacting the base portion;
An upper support positioned to be spaced above the lower support; And
And a plurality of support legs extending vertically to connect the lower support and the upper support,
Wherein the support leg comprises a lower member having a hollow circular cross section extending upwardly from the lower support and an upper end opened and a lower end extending downward from the upper support and having a lower end inserted through an open top of the lower member, And an upper member having a circular cross section,
Wherein the upper member has an inclined portion having an inclined outer circumferential surface with a smaller outer diameter so as to be tapered toward the lower end and a maximum diameter of the inclined portion is larger than an inner diameter of the lower member. . The method according to claim 1,
Wherein the inclined portion is press-fitted into an upper end of the lower member, so that the lower member and the upper member are engaged with each other. The method according to claim 1,
The upper member further includes an insertion portion extending from a lower end to a lower end of the inclined portion,
Wherein the inserting portion is inserted into the lower member so that the lower member and the upper member are engaged with each other. The method according to claim 1,
Wherein the upper member is solid-type. The method according to claim 1,
Further comprising a primary impact structure extending upward from the lower support and projecting above the upper support,
Wherein the upper portion of the primary impact structure is in the form of a corrugated tube. A heavy weight drop testing machine comprising the residual impact energy absorbing structure according to any one of claims 1 to 5.
KR1020150126041A 2015-09-07 2015-09-07 Residual impact energy absorption structure for heavy weight drop tester KR101763476B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150126041A KR101763476B1 (en) 2015-09-07 2015-09-07 Residual impact energy absorption structure for heavy weight drop tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150126041A KR101763476B1 (en) 2015-09-07 2015-09-07 Residual impact energy absorption structure for heavy weight drop tester

Publications (2)

Publication Number Publication Date
KR20170029122A true KR20170029122A (en) 2017-03-15
KR101763476B1 KR101763476B1 (en) 2017-08-04

Family

ID=58403202

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150126041A KR101763476B1 (en) 2015-09-07 2015-09-07 Residual impact energy absorption structure for heavy weight drop tester

Country Status (1)

Country Link
KR (1) KR101763476B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110130953A (en) * 2019-05-23 2019-08-16 辽宁工程技术大学 A kind of compound erosion control energy absorption device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100480053B1 (en) 2002-07-12 2005-03-30 엘지전자 주식회사 Drop-test device for mobile-phone
EP2669652A1 (en) 2012-05-30 2013-12-04 BillerudKorsnäs AB Automatic drop tester

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4254416B2 (en) * 2003-08-12 2009-04-15 株式会社Ｉｈｉ High-speed collision test method and apparatus
JP4558811B2 (en) * 2008-03-06 2010-10-06 レノボ・シンガポール・プライベート・リミテッド Drop test method and drop test apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100480053B1 (en) 2002-07-12 2005-03-30 엘지전자 주식회사 Drop-test device for mobile-phone
EP2669652A1 (en) 2012-05-30 2013-12-04 BillerudKorsnäs AB Automatic drop tester

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110130953A (en) * 2019-05-23 2019-08-16 辽宁工程技术大学 A kind of compound erosion control energy absorption device

Also Published As

Publication number Publication date
KR101763476B1 (en) 2017-08-04

Similar Documents

Publication Publication Date Title
KR101739075B1 (en) Motor control vibration exciter for measuring dynamic stiffness of structure
KR101763476B1 (en) Residual impact energy absorption structure for heavy weight drop tester
WO2016038941A1 (en) Inspection method and inspection device for resin shock absorber
JP5109993B2 (en) Falling weight test equipment
CN103459207A (en) Shock-absorbing member
KR101007538B1 (en) Connecting Device For Slab Wall Form
KR100480053B1 (en) Drop-test device for mobile-phone
CN103499485B (en) A kind of bullet emitter of Hopkinson pressure bar
JP6544185B2 (en) Gas holder, piston support structure and seismic bracket
CN207779660U (en) A kind of impact amplifier
JP2012526948A (en) A device that absorbs the kinetic energy of a moving body
KR102217224B1 (en) Burring make device for car seat frame
NO20065311L (en) Post connection device for transport vehicle and method of manufacture thereof
JP2006184133A (en) Drop tester and drop test method
CN106320783B (en) Isolator limiting device for electrical equipment
CN110023147A (en) Light weight bumper rail
KR102011306B1 (en) Fixiing device for innition check window of boiler
JP2018168868A (en) Shock absorber
KR102328390B1 (en) Pipe Expanding Apparatus
CN107228804A (en) A kind of jump bit for vertical mechanical shock test machine
KR20150002188A (en) Chiesel fixing apparatus for hydraulic breaker
CN209758293U (en) Screening formula spiral pay-off track
JP2011140390A (en) Elevator shock absorber
KR102034747B1 (en) A buffering device for elevator
JP2016079765A (en) Tornado protection net

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
AMND Amendment
E601 Decision to refuse application
AMND Amendment
X701 Decision to grant (after re-examination)