WO2007048271A1

WO2007048271A1 - An impact testing apparatus

Info

Publication number: WO2007048271A1
Application number: PCT/CN2005/001752
Authority: WO
Inventors: Tat Wing So; Ka Lun Fan; Ching Ching Cheung
Original assignee: Jets Technics Limited
Priority date: 2005-10-24
Filing date: 2005-10-24
Publication date: 2007-05-03

Abstract

An impact testing apparatus comprises a testing bracket and a dropping assembly, wherein the testing bracket comprises a bracket flat-roof and multi-retractable supporting feet which are connected to the bracket flat-roof, and the dropping assembly comprises a dropping axis and a testing head which is connected to the lower end of the dropping axis.

Description

Impact tester

The present invention relates to a test instrument, and more particularly to an impact tester for measuring the impact capability of a sports field or a playground mat. Background technique

In sports grounds and playgrounds, accidents in which people fall or fall from heights often occur. In order to minimize or prevent accidental injuries, sports facilities in playgrounds and playgrounds are provided with protective mats. At present, there are many kinds of floor mats on the market, and various materials are used. Managers of playgrounds and playgrounds need to measure the strengths and weaknesses of these mats according to certain criteria and make choices. Also, after the mat has been worn for a period of time, management and maintenance personnel need to assess whether it still meets safety requirements and needs to be replaced. In order to evaluate the performance of the mat, an impact tester is required.

'Existing impact testers, such as the Triax 2000 impact tester from the Playground Clearing House in the United States, include a tripod mount and a spherical test head mounted on top of the tripod. An accelerometer is installed in the test head. During the test work, the staff first measures the height of the test head with a ruler, and then makes the test head fall freely from the top of the tripod. When the test head is in contact with the surface of the mat, the accelerometer forms a power proportional to the acceleration value. The signal and the electrical signal are processed and converted into data indicating the impact resistance of the floor mat, thereby facilitating the recording and determination by the staff.

However, in the above-mentioned prior art impact tester, the tripod bracket is higher than the height of an ordinary person, and the operation is inconvenient. The test head falls from a height. After contact with the floor mat, if the impact of the mat is not good enough, the test head will not be buffered, and it may rebound due to the speed too fast, causing damage to the nearby staff or others. hurt.

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Summary of the invention

In order to solve the problems in the prior art, it is an object of the present invention to provide an impact tester which is compact in structure, light in weight, easy to operate, and safe and reliable.

To achieve the above object, an impact tester of the present invention includes a test stand and a drop assembly, wherein: the test stand includes a support platform and a plurality of retractable legs connected to the support platform, and the center of the support platform is a central through hole , each leg is evenly distributed around the bracket platform, in the center A magnetic seat with a switch is arranged beside the hole. When the switch is opened, the lower surface of the magnetic seat is magnetic, and when the switch is closed, the lower surface of the magnetic seat is not magnetic;

The drop assembly includes a drop shaft and a 3⁄4 test head connected to the lower end of the drop shaft. During the impact test, the drop shaft cooperates with the center through hole. The test head is hemispherical, made of a magnetically permeable material, and the spherical portion is downward. When the drop axis is lifted up through the center through hole, the upper surface of the test head can abut against the lower surface of the magnetic seat.

Compared with the existing products, the impact tester of the present invention is light in weight and less than one meter in height, and one person can easily operate and complete the entire test procedure. During the test, the movement of the test head is constrained by the hollow shaft, and it will not hurt others due to rebound, and the safety is higher. DRAWINGS

The invention will be described in detail below with reference to the accompanying drawings, in which:

1 is a schematic view of an embodiment of an impact tester of the present invention;

Figure 2 is a plan view of the stent platform;

Figure 3 is a side view of the stent platform;

4 is a schematic view of another embodiment of the impact tester of the present invention;

Figure 5 is a schematic view of the drop assembly of Figure 4;

Figure 6 is a flow chart of the electronic part of the impact tester of Figure 4. detailed description

As shown in Figures 1, 2 and 3, the impact tester of the present invention includes a test stand and a drop assembly. The test support comprises a support platform 13 and a plurality of telescopic legs 4 connected to the support platform 13, and the legs 4 are evenly distributed around the periphery of the support platform 13, and the support support platform 13 is hinged. The center of the support platform 13 is a central through hole 14. On the support platform 13, a magnetic base 2 with a rotary switch 25 is disposed near the central through hole 14. When the switch 25 is rotated to the open position, the lower surface 24 of the magnetic base 2 is magnetic, and when the switch 25 is rotated to the closed position, the lower surface 24 is not magnetic. A plurality of permanent magnets (not shown) are mounted in the magnetic base 2, and the rotation of the switch 25 adjusts the positions of the permanent magnet N and S poles so that the lower surface of the magnetic seat changes between magnetic and non-magnetic. . Similar devices and operating principles are well known in the art, such as magnetic shelves commonly used in laboratory measurements. In another embodiment, the magnetic base 2 may also include an electromagnet. When the switch 25 is opened, the alternating current is turned on, the lower surface 24 of the magnetic base 2 is magnetic, and when the switch 25 is closed, the alternating current is disconnected. The lower surface 24 is not magnetic.

The drop assembly includes a drop shaft 1 and a test head 6 coupled to the lower end of the drop shaft. The drop shaft 1 cooperates with the center through hole 14 during the impact test. The test head is hemispherical with the spherical portion down. The upper surface of the spherical test head 6 may have a threaded hole, and the lower end of the drop shaft 1 has an outer thread so that the two are threadedly connected to achieve a detachable fit.

In order to make the center through hole 14 fit better with the drop shaft 1 and reduce the wear of the center through hole 14, a bearing bush 21 may be mounted on the center through hole 14, and the bearing bush 21 has a protrusion from both sides of the center through hole 14. The flat upper and lower end faces 22 and 23 are coming out.

The test head 6 is made of a magnetically permeable material.

An adjustment mechanism 3 is also mounted on the telescopic legs 4. The adjustment mechanism 3 can be constructed of any structure known in the art for adjusting the extension length of each telescopic leg to adjust the distance between the test head 6 and the floor mat 5 to be tested. Each leg is engraved with a corresponding reference tick mark for tuning.

The drop axis 1 and test head 6 of the drop assembly of the present invention may be hollow. At the upper end of the drop shaft 1, a 0-shaped indicating ring 9 is fitted. During the falling of the drop shaft 1, the O-shaped indicator ring 9 hits the upper end surface 22 of the bearing bushing 21 and is blocked.

A horizontal display device 7 can also be provided on the stand platform 13. The horizontal display device can use flat water drops.

The process of testing the floor mat using the impact tester of the present invention is described below. First, the retractable leg 4 of the test stand of the present invention is adjusted to the reference scale line by means of the adjustment mechanism 3. The drop shaft 1 is then passed through the center through hole 14 in which the bearing bushing 21 is mounted, and the test head 6 is attached. In order to facilitate the movement of the impact tester, a groove 41 is provided at the upper end of the drop shaft 1. A corresponding pin hole 42 is formed in the two portions where the end portion is separated by the groove 41. The mounting pin 10 can be mounted in the pin hole 42 to be perpendicular to the groove 41.

Both ends of the "n"-shaped mounting bracket 8 are inserted into the mounting holes 81, 82 of the bracket platform 13, respectively. After the drop shaft 1 passes through the center through hole 14, the groove 41 is aligned with the beam portion of the mounting frame 8, and the beam portion is sized such that it can fit in the groove 41, and then the mounting pin 10 is inserted into the pin hole. 42, release the drop assembly, and support the drop assembly in the standby position by the mounting bracket 8 and the mounting pin 10. Since the drop shaft 1 and the test head 6 are detachable. It is also possible to first mount the drop shaft 1 as described above, and then mount the test head 6 at the lower end of the drop shaft 1, which facilitates the movement of the impact tester.

When the impact tester is required, the switch of the magnetic base 2 is opened. Removing the mounting bracket 8 and the mounting pin 10, lifting the drop shaft 1 until the upper surface of the test head 6 abuts against the lower end surface of the magnetic base 2 24 and attracted by magnetism. The impact tester is placed on the center of the floor mat 5 to be tested. Each of the retractable legs 4 is adjusted to maintain the distance between the bottom of the test head and the surface of the floor mat 5 at a set value. And use the flat water beads 7 to maintain the level of the support platform 13.

A 0-shaped indicator ring is placed over the upper end of the drop shaft 1 to ensure that the distance between the indicator ring 9 and the upper end face 22 of the bearing bush is equal to the distance from the test head to the surface of the floor mat to be tested. In the present invention, the distance is set to 0.7 m. A ruler with a fixed length of 0.7 m can be prepared for easy measurement. The position of the indicator ring 9 is now the "zero point" position of the test.

When the switch 25 of the magnetic base 2 is rotated to the closed position, and the lower surface 24 of the magnetic base 2 is demagnetized, the drop assembly is free to fall onto the floor mat 5 by gravity. The drop assembly continues to move downward after the test head 6 hits the surface of the floor mat 5, and then quickly stops due to the cushioning action of the floor mat 5. The indicator ring 9 dropped with the drop assembly is blocked after encountering the upper end face 22 of the bearing bushing, and the drop shaft 1 continues to descend. Then, the drop shaft 1 is lifted until the upper surface of the test head 6 contacts the lower surface 24 of the magnetic base 2. When the switch 25 of the magnetic base 2 is rotated to the open position, the test head 6 is sucked. The distance of the indicator ring 9 relative to the initially set test zero is measured, which is the maximum distance the test head drops after it touches the floor mat. The smaller the distance, the better the impact resistance of the mat. Measure the distance and record the value to complete a test.

In order to display the results of the measurement more directly, the scale can be marked on the drop axis 1 to read the value directly.

If the support platform 13 is made of a magnetically permeable material, the lower surface 24 of the magnetic base 2 can be formed by the lower plane of the support platform 13. During the operation of the impact tester, the upper plane of the test head 6 directly contacts the lower plane of the support platform 13.

Figure 4 illustrates yet another embodiment of the present invention. In this embodiment, the structure of the impact tester is substantially the same as that of the embodiment shown in FIG. 1, but does not have a 0-shaped indicator ring 9, but is provided with an electronic portion for quantitatively measuring the impact of the test head, including installation in the test. The acceleration sensor 16 inside the head, the processor 17 connected to the acceleration sensor 16 and processing the measurement signal of the acceleration sensor, has a display for displaying the measurement result processed by the processor and a control panel 15 for controlling the switch. An aperture may be formed in the upper plane of the test head 6 to connect the cable of the acceleration sensor 16 and the processor 17 through. '

The operation of the impact tester of this embodiment is also similar to that of the previous embodiment. After the test head is in contact with the surface of the floor mat, the acceleration sensor 16 is shocked to generate an electrical signal which is transmitted to the microprocessor 17, which includes a signal conditioner 18, a low pass filter 19, an analog/digital Turn The converter 20, the sorting data, and the microcontroller 30 for performing mathematical calculations. After the voltage signal is sequentially adjusted, filtered, converted, sorted, and calculated, it is displayed as a digital signal on the control panel 15. Figure 6 shows a flow chart of the signal processing procedure. The impact resistance of the mat can be assessed by comparing the values of the test results with corresponding standard values. The impact tester of this embodiment allows the operator to obtain test results faster, more conveniently, and more accurately.

In order to facilitate the carrying or carrying of the tester, the mounting handle 11 can be provided on the surface of the support platform 13.

While the present invention has been described with reference to the drawings, the present invention is not limited thereto, and various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

Claims

Rights request

1. An impact tester comprising a test stand and a drop assembly, wherein:

The test bracket comprises a support platform and a plurality of retractable legs connected to the support platform. The center of the support platform is a central through hole, and the legs are evenly distributed around the support platform, and a magnetic seat with a switch is arranged beside the central through hole. When opened, the lower surface of the magnetic seat is magnetic, and when the switch is closed, the lower surface of the magnetic seat is not magnetic;

The drop assembly includes a drop shaft and a test head connected to the lower end of the drop shaft. During the impact test, the drop shaft is matched with the central through hole. The test head is hemispherical, made of a magnetic conductive material, and the spherical portion is downward. When the drop shaft is lifted up through the center through hole, the upper surface of the test head can abut against the lower surface of the magnetic seat.

2. The impact tester according to claim 1, wherein the bracket platform is made of a magnetic material, and the lower plane of the bracket platform simultaneously constitutes a lower surface of the magnetic seat.

3. The impact tester according to claim 1, wherein a bearing bush is provided on the center through hole, the bearing bush having upper and lower end faces projecting from both sides of the center through hole.

4. The impact tester according to claim 3, wherein the magnetic base includes a plurality of permanent magnets, and the action of the switch changes the magnetic pole arrangement of the permanent magnet so that the lower surface of the magnetic base is provided with or without Magnetic.

5. The impact tester according to claim 3, wherein the magnetic base includes an electromagnet, and the action of the switch turns on or cuts off the AC power source, so that the lower surface of the magnetic seat is provided with or without magnetic .

6. The impact tester according to claim 3, wherein the drop shaft and the test head are both hollow.

7. The impact tester according to claim 3, further comprising an o-shaped indicating ring that can be placed over the upper end of the drop shaft, wherein the o-shaped indicating ring hits the upper end surface of the bearing bush during the falling of the falling shaft And blocked.

8. The impact tester according to claim 7, wherein the drop axis is marked with a scale.

9. The impact tester according to claim 3, further comprising an acceleration measuring sensor installed in the test head to process the measured electrical signal of the acceleration sensor A display panel having a display and a control switch for displaying test results processed by the processor.

10. The impact tester according to claim 9, wherein the processor comprises a signal conditioner, a low pass filter, an analog/digital converter, sorting data, and a micro controller using mathematical calculations.

11. The impact tester according to claim 3, wherein the horizontal display device is mounted on the support platform.

12. The impact tester according to claim 11, wherein the horizontal display device is a flat water bead.

13. The impact tester according to claim 3, wherein the telescopic legs are further provided with an adjustment mechanism for adjusting the height of the telescopic legs to adjust the position of the test head.