KR101112585B1 - Drop Weight Low-Velocity Impact Test Equipment - Google Patents

Abstract

The present invention is capable of moving the test unit to perform the impact test at the same position and any other position, and the impact test can be performed vertically with respect to the upper surface of the specimen or air vehicle wing structure having any three-dimensional shape It relates to a drop-type low-speed impact test device,
An outer frame 10 moving forward and backward along a pair of rails 14 arranged at regular intervals; A center frame 20 rotatably installed on the outer frame 10 and rotated about an X axis; A test unit 30 installed inside the center frame 20 to rotate about the Y axis and detecting the impact amount by dropping the impactor 35 onto the test object 50; It includes; a pneumatic device unit for operating a plurality of cylinders provided in the test unit 30.
Therefore, the test part is moved to the front, rear, left and right while the test object is fixed, and rotates about the X and Y axes to perform a test on a specimen or structure having an arbitrary shape. Low-speed impact resistance assessments of various structures, including the actual wing structure, can be performed, significantly reducing the time and cost required for testing.

Description

Drop Weight Low-Velocity Impact Test Equipment

The present invention relates to a drop-type low-speed impact test, in particular, the movement of the test part to be subjected to the impact test in the same position and any other position, and with respect to the upper surface of the wing structure of the specimen or the actual aircraft having any three-dimensional shape The present invention relates to a drop-type low-speed impact test apparatus capable of performing a low-impact impact resistance evaluation of various structures by allowing the impact test to be performed vertically.

In general, most structures are subjected to impact loads, and mechanical properties due to these impact loads are different from mechanical properties through static tests such as simple tensile tests, creep tests, and fatigue tests. A separate impact test is required to obtain data for the safety design of the device, to judge the machinability in high-speed plastic processing, and to analyze the deformation caused by the impact deformation.

Conventional impact tester is composed of various types according to the target and test conditions of the impact test, the method to measure the impact properties after the impact on the surface of the material or the test piece made of the material most of the test It is. The Charpy impact tester and the IZOD impact tester are typical, and the impact tensile tester, the impact torsion tester, and the automatic recording impact tester are also used. The impact test using the impact tester is divided into the low-speed impact test and the high-speed impact test based on the deformation rate of the material. The purpose of the impact test is to obtain the material's impact properties and to evaluate the impact stability of the product.

Impact tests on specimens of composite materials commonly used in structures are carried out in accordance with the ASTM D7136 test standard of the American Society for Testing Materials, which is used to test specimens of small plates placed horizontally on the ground. It is specified for test equipment intended to impact in the vertical direction.

By the way, most impact testers have the impactor falling at the same position of the test apparatus without moving the position in the apparatus, and in order to impact the arbitrary position of the test specimen, the test apparatus is left as it is and the test fixture is fixed by moving the test fixture. Done. Therefore, the test becomes impossible when the size of the specimen increases, and it is also impossible to test the shape having the inclined angle of the specimen at a non-horizontal angle with respect to the ground.

Accordingly, there has been a demand for the development of an impact test apparatus capable of conducting an impact test by tilting the test part vertically and hitting the test body even when the surface of the impact point is inclined with respect to the ground.

The present invention has been made in view of the above-described conventional problems, and is capable of moving back and forth, left and right of the test unit to perform an impact test at the same position and any other position, and the upper surface of the specimen or actual wing structure having an arbitrary three-dimensional shape. A low-speed impact test apparatus capable of performing low-speed impact resistance evaluation on test objects of various structures by rotating the test unit about the X-axis and the Y-axis so that the impact test can be carried out at a vertical price. The purpose is to provide.

The present invention for achieving the above object, the outer frame to move in the front and rear direction along a pair of rails arranged at a predetermined interval; A center frame rotatably installed on the outer frame and rotated about an X axis; A test unit installed inside the center frame to rotate about a Y axis and detecting an impact amount by dropping an impact object onto a test object; It characterized in that it comprises a; pneumatic device unit for operating a plurality of cylinders provided in the test unit.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the outer frame is installed on the lower left and right sides of the frame structure made of a rectangular frame, respectively, the lower LM guide transfer portion moving along the rail, and the front and rear of the frame structure And an upper LM guide rail respectively installed on both upper sides, and a pair of transfer parts that are movably coupled to both upper LM guide rails to support the center frame.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the transfer unit, the transfer plate is provided on the lower side and the carrier is moved along the upper LM guide rail, the transfer plate is provided on one side of the movement of the transfer plate It characterized in that it comprises a fixing device for limiting.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the center frame is composed of four support columns installed in the vertical direction and the upper / lower frame body in the form of a square frame connecting the support pillars in the upper and lower portions thereof. Frame structure having a rectangular cylindrical shape, a frame rotating means coupled to the outer frame to rotatably support the frame structure, and a test part rotated on the lower frame of the frame structure to allow the test part to rotate about the Y axis. It comprises a means.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the frame rotation means is made of a bearing member installed on the other one and the worm gear device installed on any one of the pair of transfer unit provided in the center frame, The worm gear device is installed in the conveying unit and a gear box having a worm and a worm gear therein, a handle for rotating the worm outside the gear box, and installed in the frame structure so that the shaft of the worm gear is fixed. And a shaft fixing plate, wherein the bearing member is installed on one side of the conveying part and the fixing plate installed on the frame structure, and is installed on the other side of the bearing to rotatably support one end of the bearing shaft, and the fixing plate provided on the conveying part and the frame structure. And a shaft fixing member to which the other end of the bearing shaft is fixed.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the test unit rotation means, the worm gear device is installed on the extension of the lower frame body so that the axis of the worm gear protrudes in the Y-axis direction and And a bearing member installed at a position facing the worm gear device to rotatably support the rotating part, wherein the worm gear device includes a gear box installed at the extension part and provided with a worm and a worm gear therein; And a handle for rotating the worm on the outside of the gear box, and a fixing block installed at the test part and to which the shaft of the worm gear is coupled, wherein the bearing member is disposed on any one side of the lower frame body and the test part. And a fixed block installed at the other side to fix the other end of the bearing shaft, the bearing being installed to rotatably support one end of the bearing shaft. The.

Further, according to the drop-type low-speed impact test apparatus of the present invention, the center frame, the center frame goniometer for measuring the relative rotation angle with respect to the outer frame of the center frame rotated by the frame rotating means, and the test unit rotation means And a test part goniometer for measuring a relative rotation angle with respect to the center frame rotated by the test part.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the test unit, the impact object to drop the impact on the test object located in the lower portion of the center frame and sense the impact amount, and the impact body can pass through A lower plate having a through hole formed in a central portion thereof, a pair of pillar members respectively provided on both sides of the lower plate, an upper plate installed on an upper side of the pillar member, and a lower plate and an upper portion to guide the vertical movement of the impactor. A pair of guide rods disposed between the plates, an impactor holding device actuated by the pneumatic device part to temporarily hold the impactor, and a pneumatic device part operated by the pneumatic device part and held by the impactor holding device And an impactor elevating device for raising the impactor to a dropping position.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the impact body is provided with an impact load sensor for detecting the impact load, the impact portion collides with the test object, and the bearing portion into which the guide rod is inserted is installed at both ends It characterized in that it comprises a weight plate, and a support installed on the lower portion of the weight plate to support the collision portion coupled to the lower end.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the impact load sensor is a piezoelectric PVDF (Poly-VinyliDene Fluoride) film, ceramic piezoelectric element, electrical resistance strain gauge, FBG (Fiber Bragg Grating) It is characterized by measuring the impact load using at least one.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the weight plate is characterized in that it further comprises a weight fixing bolt which is installed symmetrically on the upper surface to increase the impact load by adding a weight.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the impactor holding device includes a front and rear movable cylinder provided with a U-shaped jig at the rod end, the impact body lifting device, the front and rear movable cylinder is attached to the rod And a main cylinder for moving the longitudinally moving cylinder in a vertical direction.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the test unit further includes a drop speed detecting means for detecting the falling speed of the impact body, and a double impact prevention means for preventing a double impact by the impact body. It includes, the falling speed detecting means, respectively provided in a position spaced in the vertical direction to transmit a shock detection signal to the data acquisition means, consisting of a pair of optical fiber sensors for calculating the falling speed of the impact body, The double shock preventing means is installed at the lower end or side of the impact body, the magnetic proximity sensor for transmitting a signal to the pneumatic device unit when the impact body passes through a predetermined section, and the pneumatic pressure supplied from the pneumatic device unit Double impact prevention seal which is operated by pushing the impactor upwards and fixed immediately after the impactor hits the test object. It characterized in that it comprises a further.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the pneumatic device portion, a compressor for generating pneumatic, a switchboard installed in the outer frame to control the pneumatic pressure generated in the compressor, and a plurality of pneumatic It characterized in that it is provided with a pneumatic distributor for dispensing to the cylinder of the pneumatic control panel provided with a plurality of valves.

In the drop-type low-speed impact test apparatus of the present invention, the test unit is moved to the front and rear, left and right while the test object is fixed, and rotated about the X and Y axes to perform a test on a specimen or structure having an arbitrary shape. Therefore, low-speed impact resistance evaluation of various structures, from small plate specimens to various parts and actual wing structures, can be performed, which can greatly reduce the time and cost required for the test.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, because the outer frame is moved in the front and rear direction, the center frame provided with the test unit can be moved from side to side in the outer frame to move the position of the test unit to the front and rear, left and right, There is an effect that the impact test can be carried out irrespective of the size and the test position.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, since the center frame is rotatably installed about the X axis on the outer frame and the test unit is rotatably installed about the Y axis on the center frame, the test unit is configured to rotate the X axis and the Y axis. There is an effect that the impact test can be performed on the inclined surface rather than the horizontal plane rotated around the center.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, by rotating the center frame and the test unit by using the handle of the worm gear device, the rotation angle can be finely adjusted and the theoretical rotation angle is measured by using a goniometer. There is an effect that can accurately determine the amount of impact.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, since the impact member falls in a straight line by a pair of guide rods, the impact object can be collided vertically on the surface of the test object to obtain reliable test results. There is.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, after holding the impact member to move to the drop position to release the impact body to free fall, the impact amount by the impact body can be adjusted through the drop position adjustment It works.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, since the weight can be added to the impact body, the impact amount can be adjusted by changing the weight of the impact body.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, since the impact holding device holds the impact body by using a U-shaped jig, the holding body of the impact cylinder can be released only by retracting the rod. It has an effect.

In addition, according to the drop-type low-speed impact test apparatus of the present invention, the test unit is provided with a drop speed detecting means and a double impact prevention means has an effect that can accurately calculate the impact amount according to the drop of the impact body.

1 is an overall configuration diagram of a drop-type low-speed impact test apparatus according to the present invention.
Figure 2 is a reference diagram showing the impact test using a drop-type low-speed impact test apparatus according to the present invention.
Figure 3 is a block diagram showing the outer frame, the compressor and the switchboard which is the main configuration of the present invention.
Figure 4 is an enlarged view showing a conveying part of the main configuration of the present invention.
Figure 5 is a block diagram showing a central frame which is the main configuration of the present invention.
Figure 6 is a block diagram showing a frame rotation means that is the main configuration of the present invention.
Figure 7 is a block diagram showing the test portion rotation means that is the main component of the present invention.
8 is a configuration diagram showing a test unit which is the main configuration of the present invention.
9 is a configuration diagram showing an impactor which is a main configuration of the present invention.
Figure 10 is a block diagram showing the impact holding device and the impact lifting device is a main component of the present invention.
11 is a block diagram showing the drop speed detecting means and the double impact preventing means of the main components of the present invention.

Hereinafter, with reference to the accompanying drawings, the drop-type low-speed impact test apparatus of the present invention will be described.

Drop-type low-speed impact test apparatus according to the present invention, as shown in Figure 1 to 2, the outer frame 10 to move in the front and rear direction along a pair of rails 14 arranged at a predetermined interval; A center frame 20 rotatably installed on the outer frame 10 and rotated about an X axis; A test unit (30) installed inside the center frame (20) to rotate about a Y axis and detecting an impact amount by dropping the impactor (35) onto a test object; It comprises a; pneumatic device unit 40 for operating a plurality of cylinders provided in the test unit 30.

Here, the outer frame 10 is installed on the lower left and right sides of the frame structure 11 of the rectangular frame form, as shown in Figure 3, respectively, the lower LM guide transfer portion 12 to move along the rail 14 And, the upper LM guide rails 13 which are respectively installed on both front and rear sides of the frame structure 11 and the two upper LM guide rails 13 are movably coupled to support the center frame 10 and positioned It comprises a pair of transfer section 15 having a fixing member. In addition, as illustrated in FIG. 4, the transfer part 15 includes a transfer plate 15a having a carrier 15b disposed below the upper LM guide rail 13 and a lower portion of the transfer plate 15a. Is provided on one side is made of a fixing device (15c) for limiting the movement of the transfer plate (15a).

In addition, as shown in FIG. 5, the center frame 20 has four support pillars 22 installed in a vertical direction and a square frame shape connecting upper and lower support pillars 22 to each other. Frame structure 21 having a rectangular cylindrical shape consisting of the lower frame body (23, 23 '), Frame rotating means 24 is coupled to the outer frame 10 to support the frame structure 21 rotatably, Is installed on the lower frame body 23 ′ of the frame structure 21 to be rotated by the test unit rotation means 27 and the frame rotation means 24 so that the test unit 30 is rotated about the Y axis. A central frame digital goniometer for measuring a relative rotation angle of the center frame 20 with respect to the outer frame 10 and a center frame 20 of the test unit 30 rotated by the test unit rotating means 27. Including a test section digital goniometer to measure the relative rotation angle to The lure is.

Here, the frame rotating means 24 is installed on the other one of the worm gear device 25 installed in any one of the pair of transfer unit 15 provided in the center frame 20, as shown in FIG. It consists of a bearing member 26. The worm gear device 25 is installed in the transfer unit 15, the gear box 25a is provided with a worm and a worm gear therein, and a handle 25b for rotating the worm outside the gear box 25a And a shaft fixing plate 25d installed on the frame structure 21 so that the shaft 25c of the worm gear is fixed. The bearing member 26 may include a bearing 26b installed at one side of the fixed part 26d of the transfer part 15 and the frame structure 21 to rotatably support one end of the bearing shaft 26a. The shaft fixing member 26c is installed on the other side of the transfer part 15 and the fixing plate 26d of the frame structure 21 to fix the other end of the bearing shaft 26a.

In addition, as shown in FIGS. 6 and 7, the test unit rotating means 27 extends 23 ″ of the lower frame body 23 ′ so that the shaft 28 of the worm gear protrudes in the Y-axis direction. A worm gear device 28 installed at a position to rotate the test part 30 and a bearing member 29 installed at a position facing the worm gear device 28 to rotatably support the test part 30. The worm gear device 28 includes a gear box 28a installed in the extension part 23 " and provided with a worm and a worm gear therein, and a worm on the outside of the gear box 28a. It is composed of a handle 28b for rotating and a fixed block 28d installed in the test part 30 to which the shaft 28c of the worm gear is coupled. In addition, the bearing member 29 is provided on any one of the lower frame body 23 'and the test unit 30, and a bearing 29a for rotatably supporting one end of the bearing shaft 29b, and the lower part. It is composed of a fixed block (29c) is installed on the other side of the frame 23 'and the test unit 30 to fix the other end of the bearing shaft (29b).

In addition, as illustrated in FIG. 8, the test unit 30 drops on the test object 50 positioned below the center frame 20 to give an impact and detect the impact amount 35. And a lower plate 31 having a through hole 31 ′ formed at a central portion thereof so that the impactor 35 can pass therethrough, and a pair of pillar members 33 provided at both sides of the lower plate 31. And a pair of guides disposed between the upper plate 32 and the lower plate 31 and the upper plate 32 to guide the vertical movement of the impact member 35 and the upper plate 32 installed on the upper side of the pillar member 33. Rod 34, impactor holding device 36 actuated by the pneumatic device portion 40 to temporarily hold the impactor 35, and actuated by the pneumatic device portion 40 and the impact And an impactor elevating device 37 for raising the impactor 35 held by the sieve holding device 36 to the dropping position.

As illustrated in FIG. 9, the impact member 35 includes an impact load sensor 35b for detecting an impact load and a collision part 35a that collides with the test object 50, and the guide rod 34. The bearing portion 35d is inserted into the weight plate 36c is installed at both ends, and the support plate 35e is installed in the lower portion of the weight plate 35c to support the impact portion 35a coupled to the lower end do. Since the weight fixing bolt 35f to which the weight 35g is coupled symmetrically is installed on the upper surface of the weight plate 35c, it is preferable to increase the impact load by using the weight 35g. . In this case, the impact load sensor 35b measures the impact load by using at least one of a piezoelectric polyvinyl fluoride (PVDF) film, a ceramic piezoelectric element, an electrical resistance strain gauge, and a fiber bragg grating (FBG). Done.

And, as shown in FIG. 10, the impactor holding device 36 is formed of a front and rear movable cylinder 36a provided with a U-shaped jig 36c at the tip of the rod 36b, and the impactor lifting device 37 Is a main cylinder 37a to which the front and rear movement cylinder 36a is attached to the rod 37b to move the front and rear movement cylinder 36a in the vertical direction.

On the other hand, the test unit 30, as shown in Figure 11, falling speed detecting means for detecting the falling speed of the impactor 35, and double to prevent the double impact by the impactor 35 It may include a shock preventing means. The drop speed detecting means is installed at positions spaced apart in the vertical direction, respectively, after detecting the impact body 35 and transmitting the signal to the data acquiring means, as long as the falling speed of the impact body 35 is calculated. It consists of a pair of optical fiber sensor 38, the double impact preventing means 39, is installed on the lower end or side of the impact member 35, the pneumatic device when the impact member 35 passes a predetermined section Immediately after the impact object 35 collides with the test object 50 by being operated by a magnetic proximity sensor 39a of a magnetic method for transmitting a signal to the unit 40 and pneumatic pressure supplied from the pneumatic device unit 40. It consists of a double impact prevention cylinder (39b) for pushing up and fixing the impactor 35 to the upper.

In addition, as shown in FIG. 3, the pneumatic device unit 40 includes a compressor 41 for generating pneumatic pressure and a switchboard installed in the outer frame 10 to control the pneumatic pressure generated by the compressor 41. 42 and a pneumatic control panel 43 installed at the upper end of the center frame 20 and provided with a pneumatic distributor and a plurality of valves for distributing pneumatic pressure.

The drop-type low-speed impact test apparatus of the present invention configured as described above has the test part moved to the front, rear, left, and right sides while the test object is fixed, and also rotates about the X and Y axes to perform an impact test on a surface that is not horizontal to the ground. To be able to do this.

First, as illustrated in FIG. 2, the test object 50 is positioned below the apparatus, and the outer frame 10 is moved forward and backward so that the test part 30 is positioned above the test object 50. In addition, the center frame 20 is moved in the left and right directions. Of course, when the position of the test unit 30 is completely determined, the outer frame 10 is fixed by using a knob provided in the lower LM guide transfer unit 12, and the fixing device 15c installed in the transfer unit 15 is fixed. Of course, the center frame 20 should be fixed by using. As such, when the outer frame 10 and the center frame 20 are moved in the front-back direction and the left-right direction, the test so that the impact member 35 provided in the test unit 30 can hit the correct test position. The position of the part 30 can be adjusted.

When the position of the test unit 30 is fixed, the center frame 20 is rotated about the X axis in consideration of the shape of the test position, and the test unit 30 provided in the center frame 20 is centered on the Y axis. Rotate Therefore, the impact body 35 collides with the surface of the test object 50 by falling vertically regardless of the shape of the test object 50.

When the position and angle of the test unit 30 are determined through the above process, the pneumatic pressure supplied from the compressor 41 of the pneumatic device unit 40 is controlled by the pneumatic control panel 42 and the main cylinder 36a. It is distributed to the cylinder 37a and the double shock prevention cylinder 39b, respectively. The front and rear movement cylinder 36a advances the rod 36b so that the cylindrical support 35e of the impact body 35 is inserted into the U-shaped jig 36c provided at the tip of the rod 36b. In this state, the main cylinder 37a is operated to move the impact cylinder 35 temporarily held by the U-shaped jig 36c to the dropping position by raising the front-back movement cylinder 36a. When the movement of the impactor 35 is completed, the U-shaped jig 36c is retracted by the front and rear movement cylinder 36a, thereby releasing the holding of the impactor 35, and the impactor 35 has its own weight. It is dropped by the collision portion 35a of the tip is to collide with the test object (50). At this time, the double shock prevention cylinder (39b) is operated in accordance with the signal of the proximity sensor (39a) for detecting the impactor 35, the impactor 35 immediately after the impactor 35 hit the test object (50) 35) will be pushed up. Therefore, the impact body 35 can be prevented from doublely hitting the test object 50 due to elasticity or the like, and the reliability of the test can be increased. Therefore, it is possible to measure the actual impact load through the impact load sensor (35b) provided in the impact portion (35a).

Of course, in consideration of the weight of the impact body 35, the inclination angle of the center frame 20 and the test unit 30 and the falling speed of the impact body 35, the impact amount acting on the test object 50 You can also calculate

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Changes will be possible.

10: outer frame
11: frame structure 12: lower LM guide feeder
13: Upper LM Guide Rail 14: Rail
15: transfer section
15a: transfer plate 15b: carrier
15c: fixture
20: center frame
21: frame structure 22: support pillar
23: upper frame 23 ': lower frame
24: frame rotating means
25: worm gear unit
25a: gearbox 25b: steering wheel
25c: shaft (of worm gear) 25d: shaft fixing plate
26: bearing member
26a: bearing axis 26b: bearing
26c: shaft fixing member 26d: fixing plate
27: rotating means of the test part
28: worm gear mechanism
28a: gearbox 28b: steering wheel
28c: axis (of the worm gear) 28d: fixed block
29: bearing member
29a: bearing 29b: bearing axis
29c: fixed block
30: test part
31: lower plate 31 ': through hole
32: upper plate 33: pillar member
34: guide rod
35: impactor
35a: impact portion 35b: impact sensor
35c: Weight plate 35d: Bearing part
35e: Support 35f: Weight fixing bolt
35 g: weight
36: impactor holding device
36a: forward and backward cylinder 36b: rod
36c: jig
37: impactor lifting device
37a: master cylinder 37b: rod
38: optical fiber sensor
39: double impact prevention means
39a: Proximity sensor 39b: Double shock prevention cylinder
40: pneumatic device
41: compressor 42: switchboard
43: pneumatic control panel
50: test object

Claims (14)

An outer frame 10 moving forward and backward along a pair of rails 14 arranged at regular intervals;
A center frame 20 rotatably installed on the outer frame 10 and rotated about an X axis;
A test unit (30) installed inside the center frame (20) to rotate about a Y axis and detecting an impact amount by dropping the impact member (35) onto a test object (50);
Drop-type low-speed impact test apparatus comprising a; pneumatic device unit for operating a plurality of cylinders provided in the test section (30). The method of claim 1,
The outer frame 10 is installed on the lower left and right sides of the frame structure 11 in the form of a rectangular frame, respectively, the lower LM guide transfer portion 12 moving along the rail 14 and the frame structure 11 of the It includes an upper LM guide rail 13 which is respectively installed on the front and rear both sides, and a pair of transfer parts 15 are movably coupled to the both upper LM guide rail 13 to support the center frame 10. Drop type slow impact test apparatus, characterized in that. The method of claim 2,
The transfer part 15 may include a transfer plate 15a having a carrier 15b moved along the upper LM guide rail 13 at a lower portion thereof, and a transfer plate 15a disposed at one side of the transfer plate 15a. Drop-type low-speed impact test device, characterized in that it comprises a fixing device (15c) to limit the movement. The method of claim 1,
The center frame 20 has four support pillars 22 installed in a vertical direction, and upper and lower frame bodies 23 and 23 'having a rectangular frame shape connecting the support pillars 22 to each other at upper and lower portions thereof. A frame structure 21 having a rectangular cylindrical shape, a frame rotating means 24 coupled to the outer frame 10 to rotatably support the frame structure 21, and a lower frame body of the frame structure 21. Falling low-speed impact test apparatus, characterized in that it comprises a test unit rotating means for being installed at (23 ') so that the test unit 30 is rotated about the Y axis. The method of claim 4, wherein
The frame rotating means 24 is composed of a bearing member 26 installed on the other one of the worm gear device 25 provided on any one of the pair of transfer unit 15 provided in the center frame 20,
The worm gear device 25 is installed in the transfer unit 15, the gear box 25a is provided with a worm and a worm gear therein, and a handle 25b for rotating the worm outside the gear box 25a And a shaft fixing plate 25d installed on the frame structure 21 to fix the shaft 25c of the worm gear,
The bearing member 26 is a bearing 26b installed on one side of the fixed part 26d of the transfer part 15 and the frame structure 21 to rotatably support one end of the bearing shaft 26a, and Drop-type low-speed impact test characterized in that it comprises a shaft fixing member (26c) which is installed on the other side of the transfer portion 15 and the fixed plate (26d) of the frame structure 21 is fixed to the other end of the bearing shaft (26a) Device. The method of claim 4, wherein
The test part rotating means 27 is installed on an extension part 23 ″ of the lower frame body 23 ′ so that the shaft 28 of the worm gear protrudes in the Y-axis direction to rotate the test part 30. A worm gear device 28 and a bearing member 29 installed at a position facing the worm gear device 28 to rotatably support the test unit 30,
The worm gear device 28 is a gear box 28a installed in the extension portion 23 ″ and provided with a worm and a worm gear therein, and a handle for rotating the worm outside the gear box 28a. 28b) and a fixed block 28d installed in the test part 30 and to which the shaft 28c of the worm gear is coupled.
The bearing member 29 is provided on any one of the lower frame body 23 ′ and the test unit 30, and a bearing 29 a rotatably supporting one end of the bearing shaft 29 b, and the lower frame body ( 23 ') and a drop-type low-speed impact test device, characterized in that it comprises a fixed block (29c) is installed on the other side of the test section 30 to secure the other end of the bearing shaft (29b). The method of claim 4, wherein
The center frame 20 includes a center frame goniometer for measuring a relative rotation angle of the center frame 20 rotated by the frame rotation means 24 with respect to the outer frame 10, and the test unit rotation means 27. Falling low-speed impact test apparatus, characterized in that further comprising a test section goniometer for measuring the relative rotation angle with respect to the center frame 20 of the test section 30 rotated by the). The method of claim 1,
The test unit 30, the impact body 35 for dropping the test object 50 located in the lower portion of the center frame 20 to the impact and sense the impact amount, and the impact body 35 is A lower plate 31 having a through hole 31 ′ formed at a center portion thereof, a pair of pillar members 33 provided at both sides of the lower plate 31, and an upper side of the pillar member 33. A pair of guide rods 34 disposed between the upper plate 32 and the lower plate 31 and the upper plate 32 so as to guide the vertical movement of the impactor 35. The impactor holding device 36, which is actuated by the unit 40 to temporarily hold the impactor 35, and the pneumatic device unit 40, which is actuated by the pneumatic device unit 40, drops the position of the impactor holding device 36. Drop-type low-speed impact test device, characterized in that it comprises a shock lifting device (37) to raise up to. The method of claim 8,
The impact member 35 is provided with an impact load sensor 35b for detecting an impact load and a collision portion 35a that collides with the test object 50, and a bearing portion into which the guide rod 34 is inserted. A dropping type including a weight plate 36c provided at both ends and a support 35e installed at a lower portion of the weight plate 35c to support the collision part 35a coupled to a lower end thereof. Low speed impact test device. 10. The method of claim 9,
The impact load sensor 35b measures the impact load by using at least one of a piezoelectric polyvinyl fluoride (PVDF) film, a ceramic piezoelectric element, an electric resistance strain gauge, and a fiber bragg grating (FBG). Drop-type low-speed impact test device characterized in that. 10. The method of claim 9,
The weight plate 35c is a drop-type low-speed impact test characterized in that it further comprises a plurality of weight fixing bolts (35f) are installed symmetrically on the upper surface to increase the impact load by adding a weight (35g) Device. The method of claim 8,
The impactor holding device 36 includes a front and rear movable cylinder 36a provided with a U-shaped jig 36c at the tip of the rod 36b,
The impactor elevating device 37 includes a main cylinder 37a, in which the front and rear movement cylinder 36a is attached to the rod 37b to move the front and rear movement cylinder 36a in the vertical direction. Drop-type low-speed impact test device. 13. The method according to any one of claims 8 to 12,
The test unit 30 further includes a drop speed detecting means for detecting a drop speed of the impact body 35 and a double impact preventing means for preventing a double shock by the impact body 35,
The drop speed detecting means is installed at positions spaced in the vertical direction, respectively, and detects the impact body and transmits the signal to the data acquisition means, a pair of optical fiber sensors for calculating the falling speed of the impact body 35 Consisting of 38,
The double shock preventing means 39 is installed on the lower end or side of the impact body 35, the magnetic proximity sensor of the magnetic type for transmitting a signal to the pneumatic device unit 40 when the impact body passes through a predetermined section ( 39a) and a double that is operated by the pneumatic pressure supplied from the pneumatic device portion 40 to push up the impactor 35 upwards immediately after the impactor 35 collides with the test object 50. Drop-type low-speed impact test device, characterized in that it comprises an impact resistant cylinder (39b). The method of claim 1,
The pneumatic device unit 40, the compressor 41 for generating a pneumatic, the switchboard 42 is installed in the outer frame 10 to control the pneumatic pressure generated by the compressor 41, and to distribute the air pressure Drop type slow impact test apparatus, characterized in that it comprises a pneumatic distributor and a pneumatic control panel (43) having a plurality of valves.

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