KR101850877B1 - Drop impact test equipment - Google Patents

Abstract

The present invention relates to drop impact test equipment. The drop impact test equipment includes: a frame body having a guide bar fixed to a lower plate and vertically extending therefrom, and a screw rod; a hammer part including a guide plate fixed to the guide bar so as to be movable up and down, a weight fixed to the guide plate, an impact measuring unit installed under the weight to measure an amount of impact transmitted from the outside, and a hammer fixed to the impact measuring unit and colliding with a test object; a drop driving part moving up and down while being supported on the screw rod and lifting the hammer part to a desired height and then dropping it freely; and a supporter portion for supporting a test object at a lower altitude than the hammer that is moved up. According to the drop impact test equipment of the present invention having the above configuration, it is possible to precisely measure the impact energy at the moment of collision between the hammer and the test object, and to prevent the test object from being sprung or released upon collision, so that the safety can be ensured. In addition, the impact test can be performed on test objects having various sizes, and an impact load cell is accommodated in the hammer part to minimize an additional height, so that the minimum drop distance required for the test is secured. Thus, the device size can be reduced so that the device can be installed well in a narrow space.

Description

[0001] Drop impact test equipment [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drop impact test apparatus, and more particularly, to a drop impact test apparatus configured to enable precise impact test data acquisition.

As an authorized test items to grasp the physical properties of various metal materials, there are tensile test, bending test, hardness test, falling weight test, Drop Weight Tear Test) are known.

Among these various tests, the drop impact test apparatus for performing the drop test is for measuring the toughness or strength of a material. The test object to which the notch is previously formed is hit with a hammer to destroy the energy, And the material properties of the material are used as data.

In order to accurately derive the impact value applied to the test object, it is necessary to accurately measure the impact energy generated in the local part where the impact is applied. However, since the time of occurrence of the impact is very short, Device is essential.

On the other hand, in a general drop impact test apparatus for measuring impact energy, an impact load cell and a hammer are commonly mounted. However, the impact load cell has a problem that it is easily broken due to an impact coming from the outside during the test. In order to solve the problem of the breakage, a load cell having a high allowable value can be used, but it can not easily be applied at a cost.

In addition, when the impact load cell is embedded in a hammer and a supporter, the size of the hammer is limited. For example, it is impossible to test a test object having a size larger than the width of the hammer. So that the minimum load of the hammer is increased.

In addition, the conventional falling impact test apparatus can not firmly fix the test object. For example, when the hammer and the test object collide with each other, the test object bounces due to the recoil and the impact energy is dispersed. It is not possible to acquire, and there is a risk of accident.

[Related literature]

Korean Patent Registration No. 10-1019056 (high impact drop test apparatus)

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 method and apparatus for precisely measuring collision energy at the moment of collision between a hammer and a test object, as well as to prevent the test object from bouncing or being released The present invention has been made in view of the above problems.

In addition, the present invention is capable of impact test on test objects having various sizes, and the impact load cell is embedded in the hammer portion to minimize the additional height, so that the minimum drop distance required for the test is secured, Another object of the present invention is to provide a drop impact test apparatus which can be installed and operated sufficiently in a narrow space.

In order to accomplish the above object, the drop impact test apparatus of the present invention comprises a lower plate horizontal to the ground, and a plurality of guide bars and screw rods vertically extended with a lower end fixed to the lower plate A frame body; A guide plate fixed to the guide bar so as to be able to move up and down, a weight mounted on the guide plate, a collision measuring unit installed under the weight and measuring the amount of impact transmitted from the outside, A hammer part including a hammer which collides with a test object; A drop driving part moving up and down in a state of being supported by the screw rod, raising the hammer to a desired height and then dropping freely; And a supporter portion supporting the test object at a lower altitude than the hammer portion in the raised state.

The weighing device may further comprise: And a plate-like weight plate having a predetermined thickness is stacked by a desired number.

The collision measuring unit may include: A load cell jig for impact having an inner space open to the bottom and fixed to the weight, and a shock load cell fixed to the inside of the impact load cell jig and exposed to the lower part to receive impact energy raised through the hammer .

In addition, a plate-shaped connecting plate having a predetermined thickness is further provided between the impact measuring unit and the hammer, and the shock load cell jig is bolted to the connecting plate in a state where the impact load cell is accommodated therein, .

The supporter may further comprise: A pair of extension plates positioned on the opposite sides with the lower plate interposed therebetween, and a fixed frame installed to be adjustable in position on the extension plate and supporting an end portion of the test object.

In addition, the fixed frame includes: A supporter mounted on the upper portion of the supporter, a supporter fixed to an upper portion of the supporter for supporting the supporter, and a mounting space extending to the upper portion of the supporter for accommodating the end portion of the test object, And a test object holding means provided in the fixing table and pressing both ends of the test object received in the mounting space toward the receiving member so that both ends of the test object are kept horizontal during the collision test.

The drop impact test apparatus according to the present invention as described above can precisely measure the impact energy at the moment of collision between the hammer and the test object and can prevent the test object from bouncing or dropping due to recoil It is as safe as it can be.

In addition, the present invention is capable of impact test on test objects having various sizes, and the impact load cell is embedded in the hammer portion to minimize the additional height, so that the minimum drop distance required for the test is secured, It can be installed and operated well in a narrow space.

1 is a perspective view showing the overall structure of a drop impact test apparatus according to an embodiment of the present invention.
2 is a front view of the drop impact test apparatus shown in FIG.
Fig. 3 is a view showing the hammer portion shown separately in the drop impact test apparatus shown in Fig. 1. Fig.
4 is a perspective view for explaining a configuration of a supporter portion in the drop impact test apparatus shown in Fig.
5 is a view for explaining the action of the supporter section shown in Fig.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a drop impact testing apparatus 11 according to one embodiment of the present invention, and FIG. 2 is a front view of the drop impact testing apparatus shown in FIG. 3 is a configuration diagram showing the hammer portion shown in the drop impact test apparatus shown in Fig. 1 separately.

As shown in the drawing, the drop impact test apparatus 11 according to the present embodiment includes a frame body 100 for providing a supporting force, a drop driving part 500 for moving up and down while being supported by the frame body 100, A hammer part 300 located at a lower portion of the drop driving part 500 and dropping in a state of being held by the drop driving part 500 and lifted up to a predetermined height; And a supporter unit (200) for positioning the supporter unit (200).

The frame body 100 includes a rectangular plate-shaped lower plate 110 and a plurality of vertically extending main columns 120 fixed in the lower plate 110, A pair of screw rods 150 fixed parallel to the guide bar 160 and having male threads formed on an outer circumferential surface of the screw rods 150 and guide bars 160 And an upper plate 130 fixed to the upper end of the screw rod 150.

Reference numeral 111 denotes a supporting member for vertically supporting the frame body 100. Reference numeral 140 denotes a reinforcing member. The reinforcing member 140 reinforces the structural strength of the frame body 100 in a state of being fixed to the side portion of the main column 120.

The main column 120 maintains the gap between the upper plate 130 and the lower plate 110 and provides a strong overall supporting force so that the drop driving part 500 and the hammer part 300 can smoothly move up and down do.

The drop driving part 500 includes a moving plate 520 having a screw nut 532 at both ends thereof and a driving motor 533 provided at the center of the moving plate 520 and having a driving sprocket 533a on the driving shaft, A chain 534 for connecting the drive sprocket 533a and the screw nut 532 to each other and a pair of hydraulic cylinders 510 installed so as to face each other under the moving plate 520. [

The screw nut 532 is a member that engages with the screw rod 150 and has a sprocket on the outer circumferential surface thereof. The screw nut 532 rotates by receiving a rotational force from the chain 534 when the drive motor 533 is operated. In particular, the screw nuts 532 on both sides rotate in the same direction and at the same angular velocity. Therefore, as the screw nut 532 rotates, the moving plate 520 is raised or lowered while maintaining the horizontal position.

The pair of hydraulic cylinders 510 fixed to the lower portion of the moving plate 520 has piston rods located on the same axial line and is located on the opposite side between the fixed block 420a to be described later.

The piston rod moves toward the counterpart hydraulic cylinder and engages with the fixed block 420a or moves in the opposite direction and is separated from the fixed block 420a. 2, when the piston rod of the hydraulic cylinder 510 is pulled toward the cylinder while the hammer portion 300 is lifted, the piston rod is separated from the fixed block 420a, (300) falls freely.

In order to raise the hammer portion 300 in a freely falling state to a desired height, the screw nut 532 is rotated so that the hydraulic cylinder 510 is lowered to the fixed block 420a and fixes the screw nut 532 in the opposite direction. As the screw nut 532 rotates in the opposite direction, it is natural that the drop driving part 500 rises. The drop driving part 500 repeats the above-described operation and raises or drops the hammer part 300 to a target height.

The hammer unit 300 includes a guide plate 420 which is supported by the guide bar 160 and has a fixing block 420a at an upper center thereof, A collision measuring unit 320 installed at a lower portion of the weight 340 for measuring an amount of impact transmitted from the outside and a weight measuring unit 340 fixed to the collision measuring unit 320, And a hammer 310 which collides with the hammer 310.

The guide plate 420 is a plate-like member which passes the guide bar 160 in its thickness direction and moves up and down along the longitudinal direction of the guide bar 160. The guide plate 420 is always horizontally supported by the guide bar 160.

The weight 340 is formed by stacking a plurality of plate-shaped weight plates 340a having a predetermined thickness, and the weight plates 340a are closely fixed to each other through a plurality of bolts. The number of application of the weight plate 340a can be adjusted as needed.

The impact measurement unit 320 includes a rectangular box type impact cell jig 322 fixed under the weight 340 and opened downward and a shock cell 322 fixed to the inside of the impact cell 362, And a load cell 321 for a load cell.

The upper end of the impacting load cell jig 322 is fixed to a lower portion of the weight 340 and the lower end of the impacting load cell jig 322 is bolted to the connecting plate 330 . The spacing of the impact load cell jig 322 relative to the connecting plate 330 may be varied by adjusting the degree of bolting.

The lower end of the impact load cell jig 322 is separated from the upper surface of the connection plate 330 by a predetermined distance z. The spacing distance is about 0.5 mm.

The impact load cell 321 is a load cell accommodated in the impact load cell jig 322 and functions to measure the impact energy transmitted from the hammer 310. The impact load cell 321 is tightly fixed to the upper surface of the connection plate 330.

When the impact load cell 321 is slightly open from the connection plate 330, a part of the amount of the impulse coming up through the connection plate 330 is not transmitted to the impact load cell 321, have. The degree of contact of the impact load cell 321 with the connection plate 330 is related to the reliability of the test data.

Since it is important that the impact load cell 321 is tightly fixed to the connection plate 330, the impact measurement unit 320 and the connection plate 330 are coupled in the following manner.

First, the impact load cell 321 is inserted and fixed inside the impact load cell jig 322. At this time, the lower end of the impact load cell 321 protrudes downward by about 1.0 mm from the lower end of the impact load cell jig 322. This protruding length is determined at the time of designing the impact load cell jig 322 for the impact load cell 321 to be used.

If the impact load cell 321 is fixed inside the impact load cell jig 322, the connection plate 330 is positioned below the impact load cell 321, Connect the jig 322 with a bolt. In this state, the interval between the lower end of the impact-load cell jig 322 and the connecting plate 330 is about 1.0 mm.

In this state, the bolt is tightly tightened so that the interval between the impacting load cell jig 322 and the connecting plate 330 is 0.5 mm. Through this process of bolting, the impact load cell 321 is pressed to the connection plate 330 side, leaving no minute space.

The connecting plate 330 is a plate-shaped member having a predetermined thickness, and the upper surface and the lower surface thereof are coupled to the impact measuring unit 320 and the hammer 310, respectively. Accordingly, the impact energy applied to the hammer 310 can be directly transmitted to the impact measuring unit 320 through the connecting plate 330. [

The hammer 310 is a striking member fixed to the lower portion of the connecting plate 330 and strikes the test object (M in FIG. 5) waiting in the vertical lower portion when the hammer portion 300 is free to fall. The impact energy transmitted to the hammer 310 when the hammer 310 is impacted on the test object is transmitted to the impact measuring unit 320 through the connecting plate 330 as described above.

The supporter unit 200 is for positioning a test object to be collided against a vertical lower portion of the hammer 310 and includes a pair of extension plates 210 located on the opposite sides of the lower plate 110 And a fixing frame (250 in FIG. 4) installed to the extension plate 210 to adjust the position thereof and supporting the end portion of the test object.

The structure of the supporter 200 is shown separately in FIGS. 4 and 5. FIG.

FIG. 4 is a perspective view for explaining a configuration of the supporter unit 200, and FIG. 5 is a view for explaining an action of the supporter unit shown in FIG.

As shown in the figure, expansion plates 210 are symmetrically disposed on both sides of the lower plate 110. The extension plate 210 is positioned horizontally with respect to the ground and supports the fixed frame 250.

A plurality of fixing holes 212 are formed in the extension plate 210. The fixing hole 212 is a bolt hole for fixing and fixing the fixing frame 250 to the extension plate 210. As described above, since the fixing holes 212 are distributed on the entire surface of the extension plate 210, the position of the fixing frame 250 relative to the extension plate 210 can be changed as desired.

The supporter unit 200 is for supporting both ends of the test object M. If the size of the test object M is small and can be included in the lower plate 110, the supporter unit 200 is not used. At this time, supporters of small size should be applied.

The fixing frame 250 includes a supporter 220 fixed to upper portions of the expansion plates 210 on both sides and providing a supporting force and a supporting member 250 disposed horizontally above the supporter 220 and supporting the test object M, A fixing table 230 extending upward from the supporter 220 and providing a mounting space 233 for accommodating the end portion of the test object M at an upper portion of the supporting member 235, And a fixing bar 231 provided in the holding space 233 for holding the test object M held in the holding space 233 in the direction of the arrow p.

The fixing bar 231 is operated by the user to press the end portion of the test object M toward the receiving member 235 so that the free falling hammer 310 hits the test object M in the direction of arrow F The test object M is prevented from bouncing and the both ends of the test object M are maintained in the initial state. That is, the portion supported by the support member 235 is kept horizontal.

Without the fixing bar 231 having such a function, the test object M is very dangerous due to the reaction force during the test, and particularly accurate measurement can not be performed. As long as the test object M can be stably fixed as described above, the fixing bar 231 can be changed in any manner.

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 exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

11: Drop impact test apparatus 100: Frame body 110: Lower plate
111: support member 120: main column 130: upper plate
140: reinforcing member 150: screw rod 160: guide bar
200: supporter part 210: extension plate 212: fixing hole
220: supporter 230: fixed base 231: fixed bar
233: mounting space 235: supporting member 250: fixing frame
300: hammer part 310: hammer 320: crash measuring part
321: Impact load cell 322: Impact load cell jig 330: Connecting plate
340 weight weight 340a weight plate 420 guide plate
420a: fixed block 500: drop driving part 510: hydraulic cylinder
520: moving plate 532: screw nut 533: driving motor
533a: drive sprocket 534: chain

Claims (6)

A frame body having a lower plate that is horizontal with respect to the paper surface, a plurality of guide bars and screw rods that are vertically extended with the lower end thereof fixed to the lower plate, A weight plate fixed to the guide plate and constructed by stacking a desired number of plate-shaped weight plates having a predetermined thickness; and a weight plate provided below the weight plate, A hammering unit fixed to the collision measuring unit and including a hammer colliding with the test object; A drop driving part moving up and down in a state of being supported by the screw rod, raising the hammer to a desired height and then dropping freely; A supporter portion supporting the test object at a lower altitude than the hammer portion in the raised state; ≪ / RTI &
Wherein the collision measuring unit comprises: A load cell jig fixed to the inside of the impact load cell jig and protruding downward to be exposed to the impact energy transmitted through the hammer, / RTI >
And a plate-shaped connection plate having a predetermined thickness is further provided between the impact measurement unit and the hammer. The impact load cell is received in the impact load cell jig and is compressed by the connection plate, So that the amount of impact transmitted through the connection plate can be transmitted without loss. delete delete delete The method according to claim 1,
Wherein the supporter portion comprises:
A pair of extension plates located on the opposite sides with the lower plate interposed therebetween,
And a fixed frame mounted on the extension plate so as to be adjustable in position and supporting an end portion of the test object. 6. The method of claim 5,
Wherein the fixed frame comprises:
A supporter mounted on the upper portion of the extension plate,
A supporting member fixed to the upper portion of the supporter and supporting the test object,
A supporter extending to an upper portion of the supporter and provided at an upper portion of the supporter to provide a supporter space for accommodating the end portion of the test object;
And test object holding means provided on the fixing table and pressing both ends of the test object accommodated in the mounting space toward the support member so that both ends of the test object are kept horizontal during the collision test.

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