KR101738125B1 - Falling impact tester - Google Patents

Falling impact tester Download PDF

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Publication number
KR101738125B1
KR101738125B1 KR1020150131687A KR20150131687A KR101738125B1 KR 101738125 B1 KR101738125 B1 KR 101738125B1 KR 1020150131687 A KR1020150131687 A KR 1020150131687A KR 20150131687 A KR20150131687 A KR 20150131687A KR 101738125 B1 KR101738125 B1 KR 101738125B1
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KR
South Korea
Prior art keywords
plate
guide
hammer
moving
guide bar
Prior art date
Application number
KR1020150131687A
Other languages
Korean (ko)
Other versions
KR20170033660A (en
Inventor
박철우
김승원
원상연
Original Assignee
강원대학교산학협력단
원상연
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Application filed by 강원대학교산학협력단, 원상연 filed Critical 강원대학교산학협력단
Priority to KR1020150131687A priority Critical patent/KR101738125B1/en
Publication of KR20170033660A publication Critical patent/KR20170033660A/en
Application granted granted Critical
Publication of KR101738125B1 publication Critical patent/KR101738125B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
    • 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
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0039—Hammer or pendulum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0067—Fracture or rupture

Abstract

The present invention relates to a test apparatus for testing a test object, comprising: a lower plate having a flat surface on which a test object is placed; a main column installed upright at a predetermined height in a vertex area of the upper surface of the lower plate; A body portion; A guide bar disposed between the main column and the main column so as to be opposed to each other, and a hammer which is installed between the guide bar and the guide bar so as to be able to move up and down along the guide bar and collide with the test object, A guide portion formed of a guide plate; A moving plate on which the hydraulic cylinder is fixed so that the hammer can be dropped after the hammer is moved at a predetermined height, and a moving means for moving the moving plate at a predetermined height, A drop driving unit comprising: It is possible to provide a drop impact tester which is capable of dropping a hammer which impacts on a test object at the same point during repetitive test so that accurate testing can be carried out, The user's satisfaction with the product can be improved by improving the structural stability compared with the way in which the drop occurs.

Description

FALLING IMPACT TESTER

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a drop impact tester, and more particularly, to a drop impact tester capable of performing an accurate fall impact test.

In general, the test items to understand the physical properties of metallic materials include tensile test, bending test, hardness test, Naval Research Laboratory, and failure mode change measurement test Drop Weight Tear Test).

Among these test items, drop impact tester for dropping impact test is a device for measuring the toughness or strength of a material. It is designed to break a test piece formed with a notch by applying an impact force with a hammer (pendulum) It is a type of physical property tester that uses the energy value of the energy generated in the destruction process as the mechanical property data of the material.

However, in the conventional drop impact tester, the hammer that applies an impact to the test object while falling is a method of using the electromagnet or using the wire to move the hammer up and down. Therefore, in the case of using the electromagnet, The hammer can be dropped arbitrarily, and in the case of a method using a wire, the wire can be cut, and the stability is lowered.

Further, since the hammer does not have a separate means for guiding the falling path of the drop of the hammer during the drop operation, accurate test can not be performed due to fluctuation of dropping point of the drop of the hammer, Can not be obtained.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a hammer which impacts a test object, The object of the present invention is to provide a drop impact tester capable of improving the user's satisfaction with a product by improving the structural stability compared to a method in which a drop of a hammer is performed.

In order to solve the above-described problems, the present invention provides a liquid crystal display device comprising: a lower plate having a flat surface on which a test object is placed; a main column arranged upright at a predetermined height in an apex area of the upper surface of the lower plate; An upper plate; A guide bar disposed between the main column and the main column so as to be opposed to each other, and a hammer which is installed between the guide bar and the guide bar so as to be able to move up and down along the guide bar and collide with the test object, A guide portion formed of a guide plate; A moving plate on which the hydraulic cylinder is fixed so that the hammer can be dropped after the hammer is moved at a predetermined height, and a moving means for moving the moving plate at a predetermined height, A drop driving unit comprising: A drop impact tester is provided.

Here, a guide hole may be formed in the vertex area of the guide plate, and four guide bars may be provided symmetrically so that each guide bar may be inserted into the guide hole.

A rod block may be provided at a position corresponding to the hammer on the upper surface of the guide plate so as to be gripped by the hydraulic cylinder so that the guide plate is selectively fixed to the moving plate.

The moving means may include a screw bar having a screw thread formed on an outer surface of the guide bar and the guide bar, the screw nut being rotatably installed on both sides of the plate of the moving plate to be fastened to the screw bar, A drive motor provided on the upper surface of the moving plate and provided with a sprocket on the rotating shaft so as to rotationally drive the screw nut and the sprocket, and a chain interconnecting the screw nut and the sprocket.

In addition, a tension adjuster may be provided on the upper surface of the moving plate between the screw nut and the sprocket of the driving motor to adjust the tension of the chain.

The tension adjusting unit may include a tension sprocket that is rotatably installed on the upper surface of the moving plate so as to be movable at regular intervals along a direction perpendicular to the chain, and is in contact with the chain so that the chain passes through the tension sprocket.

A reinforcing member may be provided on one side of the outer surface of the main column to fix the main column with a pair of main columns and another pair of main columns to reinforce the structural stability of the main column.

The present invention is not limited to a hammer which impacts on a test object so that the hammer falls down to the same point during repetitive testing, It is possible to improve the user's satisfaction with the product.

1 is a perspective view illustrating a structure of a drop impact tester according to an embodiment of the present invention,
FIG. 2 is a side view showing the structure of the drop impact tester of FIG. 1 viewed from the side,
3 is a plan view showing a structure viewed from above on the fall impact tester of FIG. 1,
4 is an operation diagram illustrating the operation of the drop impact tester according to one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the structure of a drop impact tester according to an embodiment of the present invention, FIG. 2 is a side view showing a structure of the fall impact tester shown in FIG. 1, FIG. 4 is an operation diagram illustrating an operation of a drop impact tester according to an embodiment of the present invention. Referring to FIG.

As shown in these drawings, the drop impact tester according to the present invention includes a lower plate 110 having a flat surface on which a test object is placed, and a lower plate 110 having a vertically- A main body 100 including a main column 120 and an upper plate 130 disposed on the upper surface of the main column 120. The main column 120 is disposed between the main column 120 and the main column 120, A guide bar 210 installed between the guide bar 210 and the guide bar 210 so as to be movable upward and downward along the guide bar 210, A hydraulic cylinder 310 disposed opposite to the hammers 221 so as to grip both sides of the hammers 221 and a guide plate 220 having a guide plate 220 provided with the hammers 221, After moving to a constant height And a drop driving part 300 including a moving plate 320 to which the hydraulic cylinder 310 is fixed and a moving unit 330 to move the moving plate 320 at a predetermined height .

The main body 100 includes a lower plate 110 mounted on the ground and having a predetermined height to allow a drop impact test to be performed, And a top plate 130 provided on the upper surface of the main column 120.

A plurality of support members 111 are provided on the lower surface of the lower plate 110 so that the lower plate 110 can be stably placed on the ground. The support members 111 are adjustable in height, It is preferable that the main body 100 can be stably mounted.

The main column 120 is a member arranged upright along the height direction of the lower plate 110 in the four vertex regions of the lower plate 110 and is formed to have a height sufficient to generate an impact force during the drop impact test effective.

A reinforcing member 140 is fixed to one side of the outer surface of the main column 120 and fixed to the pair of main columns 120 and the pair of main columns 120 to reinforce the structural stability of the main column 120 Is installed.

The upper plate 130 is installed on the upper surfaces of the plurality of main columns 120 and serves to prevent the drop driving unit 300 from being detached from the screw bar 331 to be described later when the drop driving unit 300 is operated for drop impact test do.

The guide part 200 includes a guide bar 210 positioned between the main column 120 and the main column 120 so as to face each other and a guide bar 210 disposed between the guide bar 210 and the guide bar 210 And a guide plate 220 installed to move up and down along the guide bar 210 and having a hammer 221 which collides with the test object.

The guide unit 200 serves to guide the guide plate 220 and the path of the dropping of the hammer 221, which are moved upward by driving the drop driving unit 300 for falling impact test, do.

A guide bar 210 is disposed between the main column 120 and the main column 120 and a guide hole 222 through which the guide bar 210 is inserted in the vertex area of the guide plate 220, .

Four guide bars 210 are symmetrically arranged so that the guide plate 220 can be moved in a balanced state parallel to the ground without being tilted to one side when the guide plate 220 is moved.

It is preferable that the outer surface of the guide bar 210 is formed so as to smoothly minimize friction when the guide plate 220 inserted into the guide bar 210 through the guide hole 222 is dropped.

A load block 223 is provided at a position corresponding to the hammers 221 on the upper surface of the guide plate 220 so as to be gripped by the hydraulic cylinder 310 to fix the guide plate 220 selectively to the moving plate 320 have.

The rod block 223 is a member for pressing the both sides of the hydraulic cylinder 310 to thereby grip the guide plate 220 and the hammer 221 as a result of which the hydraulic cylinder 310 can grip the hydraulic cylinder 310 It is effective that the rod block 223 is formed of a material having a certain elasticity so that the rod block 223 can be accurately pressed.

 The drop driving part 300 includes a hydraulic cylinder 310 that grips the rod block 223 and fixes the guide plate 220 to the moving plate 320 and a moving plate that moves up and down with the hydraulic cylinder 310 fixed 320, and a moving means 330 for moving the moving plate 320 up and down.

The hydraulic cylinder 310 is composed of a cylinder fixed to the lower surface of the moving plate 320 and a piston inserted into and out of the cylinder so that the end of the piston comes into contact with both sides of the rod block 223 to fix the moving plate 320 do.

The moving plate 320 is a plate-shaped member arranged on the guide plate 220 so as to be movable along the height direction of the screw bar 331. The moving plate 320 is provided with moving means 330 are arranged.

The moving means 330 includes a screw bar 331 which is disposed between the guide bar 210 and the guide bar 210 and is threaded on the outer surface of the screw bar 331 and is rotatably provided on both sides of the plate surface of the moving plate 320 A screw nut 332 fastened to the screw bar 331 and a driving motor provided on the upper surface of the moving plate 320 to include a sprocket 333a on a rotary shaft for driving the screw nut 332 to rotate, And a chain 334 connecting the screw nut 332 and the sprocket 333a to each other.

The screw bar 331 is a rod-shaped member having a screw thread formed on the outer surface thereof and installed between the guide bar 210 and the guide bar 210. Both end portions are fixedly coupled to the lower plate 110 and the upper plate 130 have.

The screw nut 332 is rotatably provided on both sides of the moving plate 320 so that the moving plate 320 can be moved upward and downward along the screw bar 331 by the rotation of the screw nut 332.

The drive motor 333 is provided with a sprocket 333a at the rotational axis of the drive motor 333 so as to transmit the drive force to the screw nut 332 as a member for generating a driving force by which the screw nut 332 can be rotated.

The chain 334 is a member for transmitting the rotational driving force generated by the driving motor 333 to the screw nut 332. It is preferable that the chain 334 is provided in a chain rather than a belt or pulley shape in order to prevent slippage.

A separate tension adjuster 340 is provided on the upper surface of the moving plate 320 between the screw nut 332 and the sprocket 333a of the driving motor 333 to adjust the tension of the chain 334 It is effective.

The tension adjuster 340 is installed on the upper surface of the moving plate 320 so as to be rotatable and movable at regular intervals along a direction perpendicular to the chain 334 and is in contact with the chain 334, And a tension sprocket 341 for allowing the tension sprocket 341 to rotate.

That is, when the chain 334 is loose, the chain 334 is tensioned by moving the tension sprocket 341 at regular intervals in a direction perpendicular to the chain 334, so that the tension of the chain 334 can be adjusted .

The operation of the drop impact tester according to an embodiment of the present invention having the above-described configuration will be described below.

First, after placing the test object in the central region of the upper surface of the lower plate 110, the hydraulic cylinder 310 is operated so that the piston is drawn out of the cylinder so that the end of the piston comes into contact with both sides of the rod block 223, ).

The guide plate 220 and the moving plate 320 are fixed by the hydraulic cylinder 310 so that the hammer 221 provided on the lower surface of the guide plate 220 can be moved up and down .

Thereafter, when the drive motor 333 is driven, the sprocket 333a provided on the rotary shaft of the drive motor 333 rotates and the chain 334 with one side engaged with the sprocket 333a rotates.

The screw nut 332 engaged with the other side of the chain 334 is driven to rotate by the rotation of the chain 334 and the moving plate 320 is rotated by the rotation of the screw nut 332, And moves up and down along the height direction.

When the chain 334 is loose, the tension sprocket 341 of the tension adjuster 340 is moved in a direction perpendicular to the chain 334 to thereby tension the chain 334, So that the driving force is accurately transmitted to the screw nut 332 side.

The guide plate 220 fixed to the moving plate 320 is moved up and down by the hydraulic cylinder 310 in accordance with the movement of the moving plate 320 and the hammer 221 provided on the lower surface of the guide plate 220 Thereby moving up and down.

The tester stops the operation of the drive motor 333 when the hammer 221 reaches the required height after driving the drive motor 333 to move the hammer 221 by the height required for the fall impact test.

Thereafter, when the hydraulic cylinder 310 is driven to allow the piston to be drawn into the cylinder, the restraint of the rod block 223 is released and the test plate 220 is moved to the test position where the moving plate 220 and the hammer 221 are seated on the lower plate 110 Impact force is generated while colliding with the object, and the drop impact test is completed.

The hammer which impacts the test object is caused to drop to the same point in the repeated test so that the accurate test is performed and the structural stability is improved compared with the method in which the hammer is dropped by the wire method or the electronic method Thereby improving the user's satisfaction with the product.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

100: main body 110: lower plate
111: Support member 120: Main column
130: upper plate 140: reinforcing member
200: guide part 210: guide bar
220: guide plate 221: hammer
222: insert ball 223: road block
300: drop driving part 310: hydraulic cylinder
320: moving plate 330: moving means
331: screw bar 332: screw nut
333: Driving motor 333a: Hammer
334: chain 340: tension adjusting part
341: Tension sprocket

Claims (7)

A main column 120 disposed upright at a predetermined height in a vertex area of the upper surface of the lower plate 110; a main column 120 disposed on the upper surface of the main column 120 at a predetermined height; And an upper plate (130) installed at the upper portion of the main body (100).
A guide bar 210 disposed between the main column 120 and the main column 120 and disposed opposite to each other and a guide bar 210 disposed between the guide bar 210 and the guide bar 210, And a guide plate (220) mounted on the lower surface of the guide plate (220) so as to move up and down along the guide plate and having a hammer (221) colliding with the test object.
A hydraulic cylinder 310 disposed opposite to each other so as to grip both sides of the hammer 221 and a moving plate 310 fixed to the hydraulic cylinder 310 so as to be able to drop the hammer 221 after moving the hammer 221 at a predetermined height 320), and a moving means (330) for moving the moving plate (320) at a predetermined height; Including,
The moving means 330 includes a screw bar 331 which is disposed between the guide bar 210 and the guide bar 210 and is threaded on the outer surface of the guide bar 210, A screw nut 332 fastened to the screw bar 331 and a sprocket 333a provided on a rotating shaft for driving the screw nut 332 to rotate the screw nut 332 and installed on the upper surface of the moving plate 320 A driving motor 333 and a chain 334 connecting the screw nut 332 and the sprocket 333a to each other. The method according to claim 1,
Wherein a guide hole (222) is formed in the vertex area of the guide plate (220), and four guide bars (210) are symmetrically inserted into the guide hole (222) Tester. The method according to claim 1,
A load block (not shown) is provided at a position corresponding to the hammer 221 on the upper surface of the guide plate 220 so as to be gripped by the hydraulic cylinder 310 to selectively fix the guide plate 220 to the moving plate 320 223) are provided on the lower surface of the lower portion delete The method according to claim 1,
A separate tension adjuster 340 is provided on the upper surface of the moving plate 320 between the screw nut 332 and the sprocket 333a of the driving motor 333 to adjust the tension of the chain 334, And a drop impact tester. 6. The method of claim 5,
The tension adjuster 340 is rotatably installed on the upper surface of the moving plate 320 at a predetermined interval along a direction perpendicular to the chain 334 and is in contact with the chain 334, 334) is passed through the tension sprocket (341). The method according to any one of claims 1 to 3, 5, and 6,
A reinforcement member 140 is fixed to one side of the outer surface of the main column 120 and fixed to a pair of main columns 120 and another pair of main columns 120 to reinforce the structural stability of the main column 120 A drop impact tester characterized by being installed.

KR1020150131687A 2015-09-17 2015-09-17 Falling impact tester KR101738125B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150131687A KR101738125B1 (en) 2015-09-17 2015-09-17 Falling impact tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150131687A KR101738125B1 (en) 2015-09-17 2015-09-17 Falling impact tester

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KR101738125B1 true KR101738125B1 (en) 2017-05-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102148322B1 (en) 2019-02-18 2020-08-26 서울대학교산학협력단 Apparatus and Method for Drop Weight Impact Test

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109269922A (en) * 2018-09-07 2019-01-25 河南检亿科技有限公司 A kind of low-temperature impact test device for wire and cable
CN109269921A (en) * 2018-10-11 2019-01-25 深圳市恩普达工业系统有限公司 Battery pole electricity column test macro
CN109374447A (en) * 2018-10-17 2019-02-22 王书志 A kind of drop hammer impact testing machine for construction material detection
CN113049353A (en) * 2021-02-25 2021-06-29 太原理工大学 Inorganic binder stable material sample forming device based on density method

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JP2005062003A (en) 2003-08-12 2005-03-10 Ishikawajima Harima Heavy Ind Co Ltd High-speed collision test method and device
KR101135135B1 (en) * 2011-06-13 2012-04-13 대경테크 주식회사 Free-fall testing device

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Publication number Priority date Publication date Assignee Title
JP2005062003A (en) 2003-08-12 2005-03-10 Ishikawajima Harima Heavy Ind Co Ltd High-speed collision test method and device
KR101135135B1 (en) * 2011-06-13 2012-04-13 대경테크 주식회사 Free-fall testing device

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Title
박철우, 강원대학교 건설시스템공학과 첨단건설재료 및 구조연구실, 콘크리트학회지, 2015년11월, pp78-80

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102148322B1 (en) 2019-02-18 2020-08-26 서울대학교산학협력단 Apparatus and Method for Drop Weight Impact Test

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