Distance measuring device for drop impact test

Abstract

The present invention discloses a distance measuring device suitable for a drop impact test, comprising a guide rail arranged in a vertical direction, a distance indicator slidably arranged on the guide rail, and a driving device driving the distance indicator to move along the guide rail; the driving device comprises a connecting belt connected to the distance indicator, a power mechanism driving the connecting belt to move, and a control mechanism controlling the operation of the power mechanism. The distance measuring device suitable for a drop impact test of the present invention has a reasonable structural design, stable and reliable operation, can be attached to the original test device, and can also be independently operated without affecting the use of the original system, adopts a non-contact measurement method, is easy to use, has high measurement accuracy, and improves the safety of the entire test device.

Description

Technical Field

[0001] The invention relates to a distance measuring device suitable for a falling impact test. Background Art

[0002] When testing the fall suspension safety belt, the overall dynamic load test should be carried out according to the method specified in Article 4.8 of GB / T 6096-2009 Safety Belt Test Methods. Figure 1 As shown, a sensor 2 and a hanging point 1 are installed on a test bench 3, and a simulated person 5 is installed on the hanging point 1 through a sample 4. During the experiment, the simulated person 5 is first fixed by a suspension mechanism 6, and then the simulated person 5 is separated from the suspension mechanism 6 and falls downward. The vertical distance measured before and after the fall is the fall height.

[0003] The traditional measurement method uses an impact test frame that is integrated with the building structure for testing. The impact test frame is about 6 meters high. During the test, the fixed point (or the ground) of the impact test frame is used as the reference point to measure the distance of the simulator before and after the test. The difference is the fall distance. If the measurement is performed from above the simulator, there is a risk of falling from a height. If the measurement is performed from below the simulator, there is a risk of being hit by the simulator (the simulator weighs 100 kG).

[0004] In the prior art, there is a manikin with a built-in distance sensor, which is pre-charged before use. The measurement data is sent wirelessly and displayed by the receiving end. Although the measurement device can obtain relatively accurate data when it is first used, it is expensive, has a complex structure, is susceptible to electromagnetic interference, and has a high failure rate after multiple impacts and poor reliability. Summary of the invention

[0005] In view of this, in order to overcome the defects of the prior art, the purpose of the present invention is to provide an improved distance measuring device suitable for drop impact test, which has low cost, reliable use, and quick, convenient and accurate measurement.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A distance measuring device suitable for a drop impact test comprises a guide rail arranged in a vertical direction, a distance indicator slidably arranged on the guide rail, and a driving device driving the distance indicator to move along the guide rail; the driving device comprises a connecting belt connected to the distance indicator, a power mechanism driving the connecting belt to move, and a control mechanism controlling the operation of the power mechanism. Since the drop impact test mainly depends on the height difference of the simulated person before and after the test, that is, the falling distance, the guide rail is arranged in a vertical direction and a distance indicator is arranged on the guide rail. The distance indicator is moved on the guide rail by the driving device to mark the height of the simulated person before and after the test, and then the falling distance of the simulated person is obtained, and the result of the drop impact test is obtained. The entire distance measuring device is simple and quick to operate, and the test results are accurate.

[0008] Preferably, the driving device further comprises a counterweight connected to the other end of the connecting belt, that is, the connecting belt connects the distance indicator and the counterweight, and the distance indicator is driven to move by the counterweight and controlled by the power mechanism, so that the movement process of the distance indicator is more stable and the service life of the device is longer.

[0009] Preferably, the guide rail has a bearing capable of sliding along the guide rail, the distance indicator is mounted on the bearing, and the connecting belt is connected to the bearing.

[0010] Preferably, the distance indicator is used to emit an indicator line toward the manikin, and the indicator line is arranged horizontally. The distance indicator is used to mark the height of the manikin in the vertical direction before and after the test, that is, the falling distance is the height in the vertical direction, and the indicator line is a horizontal line arranged perpendicular to the vertical direction.

[0011] Preferably, a guide wheel for guiding the movement of the connecting belt is also provided on the movement path of the connecting belt. The guide wheel is provided to make the movement of the distance indicator, the connecting belt and the counterweight more stable, and the guide wheel is provided on a side close to the counterweight.

[0012] Preferably, the distance measuring device includes a ruler arranged corresponding to the distance indicator, and the moving distance of the distance indicator is obtained by the ruler. The ruler is preferably arranged on the guide rail, and can also be arranged on the moving path of the counterweight or arranged corresponding to the indication line emitted by the distance indicator. The displacement is read by the ruler, and the result is more accurate and intuitive.

[0013] Preferably, a photoelectric encoder is also provided on the movement path of the connecting belt, and the moving distance of the distance indicator is obtained by the photoelectric encoder. In some embodiments, a photoelectric encoder can also be provided, and the current position of the distance indicator can be obtained by decoding the signal through a single-chip microcomputer, and the position difference corresponding to the photoelectric encoder before and after the test is the falling distance. The photoelectric encoder is installed between the power mechanism and the guide wheel.

[0014] Preferably, the distance measuring device further comprises a housing for accommodating the driving device, and the housing is provided with a movement hole for the connecting belt to pass through. The driving device is located on the upper part of the guide rail, and the housing is also located above the guide rail, and the housing contains a power mechanism, a photoelectric encoder, a guide wheel and part of the connecting belt.

[0015] More preferably, the distance measuring device also includes an auxiliary guide rail for limiting the movement of the counterweight, which can ensure the stability of the counterweight operation.

[0016] Preferably, the connecting belt is a toothed belt matching the power mechanism, and the power mechanism is a stepping motor. The control mechanism controls the switch of the stepping motor, drives the distance indicator to move through the toothed belt, obtains the corresponding position of the simulated person before and after the test, and obtains the falling distance through a ruler or an analytical photoelectric encoder.

[0017] Compared with the prior art, the advantages of the present invention are as follows: the distance measuring device suitable for the drop impact test of the present invention has a reasonable structural design, stable and reliable operation, can be attached to the original test device, and can also be operated independently without affecting the use of the original system. It adopts a non-contact measurement method, is easy to use, has high measurement accuracy, and improves the safety of the entire test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall dynamic load test of the fall suspension safety belt;

[0020] Figure 2 It is a schematic diagram of a distance measuring device suitable for a drop impact test in a preferred embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of a distance measuring device suitable for a drop impact test in a preferred embodiment of the present invention during measurement;

[0022] Among them: hanging point-1, sensor-2, test bench-3, test sample-4, simulated person-5, suspension mechanism-6, guide rail-7, distance indicator-8, counterweight-9, connecting belt-10, shell-11, moving hole-12, bearing-13, guide wheel-14, photoelectric encoder-15, stepping motor-16. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] Reference Figure 2-3 As shown, the distance measuring device suitable for the drop impact test of this embodiment includes a guide rail 7 arranged in the vertical direction, a bearing 13 slidably arranged on the guide rail 7, a distance indicator 8 fixed on the bearing 13, a driving device for driving the distance indicator 8 to move along the guide rail 7, and a housing 11 for accommodating the driving device.

[0025] The distance indicator 8 is used to emit an indication line toward the manikin 5, and the indication line is set horizontally. The function of the distance indicator 8 is to mark the height of the manikin 5 in the vertical direction before and after the test, that is, the falling distance is the height in the vertical direction, and the indication line is a horizontal line set perpendicular to the vertical direction. In this embodiment, the distance indicator 8 is a laser indicator, and the indication line is a laser line.

[0026] The driving device includes a counterweight 9, a connecting belt 10, a power mechanism for driving the connecting belt 10 to move, and a control mechanism for controlling the operation of the power mechanism. One end of the connecting belt 10 is connected to the bearing 13, and the other end is connected to the counterweight 9, and in this embodiment, the distance indicator 8 and the counterweight 9 are relatively distributed on both sides of the guide rail 7 and the driving device. That is, the connecting belt 10 connects the bearing 13 and the counterweight 9, and the distance indicator 8 is driven to move by the counterweight 9 and controlled by the power mechanism, so that the movement process of the distance indicator 8 is more stable and the service life of the device is longer.

[0027] Since the drop impact test mainly depends on the height difference of the manikin 5 before and after the test, that is, the drop distance, the guide rail 7 is arranged in the vertical direction and a distance indicator 8 is arranged on the guide rail 7. The distance indicator 8 is moved on the guide rail 7 by a driving device to mark the height of the manikin 5 before and after the test, and then the drop distance of the manikin 5 is obtained, and the result of the drop impact test is obtained. The entire distance measuring device is simple and quick to operate, and the test result is accurate.

[0028] In this embodiment, a guide wheel 14 and a photoelectric encoder 15 for guiding the movement of the connecting belt 10 are also provided on the movement path of the connecting belt 10, and the photoelectric encoder 15 is installed between the power mechanism and the guide wheel 14. The guide wheel 14 is provided to make the movement of the distance indicator 8, the connecting belt 10 and the counterweight 9 more stable, and the guide wheel 14 is provided on the side close to the counterweight 9. In this embodiment, an auxiliary guide rail for limiting the movement of the counterweight 9 is also provided corresponding to the counterweight 9, which can ensure the stability of the operation of the counterweight 9.

[0029] The current position of the distance indicator 8 can be obtained by decoding the signal through the single-chip microcomputer. The position difference corresponding to the photoelectric encoder 15 before and after the test is the falling distance, which is quick and convenient. Specifically, the photoelectric encoder 15 is a sensor that converts the mechanical geometric quantity on the input shaft into a pulse or digital quantity through photoelectric conversion. It is composed of a grating disk and a photoelectric detection device. The grating disk is a circular plate with a certain diameter and a plurality of rectangular holes opened in equal parts. When the grating disk rotates, the detection device composed of electronic components such as light-emitting diodes outputs a plurality of pulse signals. The displacement, angular velocity, rotation speed and other data can be obtained by statistical calculation of the pulse signal. In order to judge the direction of rotation, the code disk can also provide a pulse signal with a phase difference of 90°. The single-chip microcomputer in this embodiment adopts a single-clock / machine cycle (1T) single-chip microcomputer produced by Hongjing Technology. It is a high-speed / low-power / super anti-interference 8051 single-chip microcomputer, with an internal integrated 8-way high-speed 10-bit A / D conversion (250K / S) for decoding, calculation and display of photoelectric coded signals.

[0030] In some other embodiments, the photoelectric encoder 15 can be replaced by a ruler corresponding to the distance indicator 8, and the moving distance of the distance indicator 8 can be obtained by the ruler. The ruler is preferably set on the guide rail 7, and can also be set on the moving path of the counterweight 9 or set corresponding to the indicator line emitted by the distance indicator 8. The displacement is read by the ruler, and the result is more accurate and intuitive.

[0031] The driving device is located on the upper part of the guide rail 7, and the housing 11 is also located above the guide rail 7. The housing 11 is provided with a movement hole 12 for the connecting belt 10 to pass through. The housing 11 contains a power mechanism, a photoelectric encoder 15, a guide wheel 14 and part of the connecting belt 10.

[0032] The connecting belt 10 in this embodiment is a toothed belt matched with the power mechanism, and the power mechanism is a stepping motor 16. The control mechanism controls the switch of the stepping motor 16, drives the distance indicator 8 to move through the toothed belt, obtains the corresponding position of the simulated person 5 before and after the test, and obtains the falling distance through the ruler or analytical photoelectric encoder 15.

[0033] The following briefly describes the measurement process of the distance measuring device suitable for the drop impact test in this embodiment:

[0034] The manikin 5 is hung at the position specified by the standard, the power mechanism is started by the control mechanism, the connecting belt 10 moves, the distance indicator 8 moves, and the laser indication line is aligned with a fixed indication point on the manikin 5; the current position information is recorded.

[0035] Release the simulator 5 and perform a drop impact test; wait for the simulator 5 to come to a standstill.

[0036] The power mechanism is started again by the control mechanism, and the distance indicator 8 is moved so that the laser indication line is aligned with the indication point on the simulated person 5; and the current position information is recorded.

[0037] The falling distance is obtained by using a ruler or an analytical photoelectric encoder 15. Figure 3 As shown, Figure 3 In the figure, the initial position of the simulator 5 is indicated by a solid line, the position of the simulator 5 after movement is indicated by a dotted line, the initial position of the distance indicator 8 is indicated by a solid line, and the position of the distance indicator 8 after movement is indicated by a dotted line. The horizontal line is the laser indicator line, and the distance between the two laser indicator lines is the falling distance of the simulator 5.

[0038] The distance measuring device of this embodiment is composed of the main parts such as guide rail 7, bearing 13, distance indicator 8, stepper motor 16, photoelectric encoder 15, toothed belt, etc. The distance measuring device of this embodiment is set independently of the impact test frame and will not affect the use of the impact test frame when working.

[0039] When the stepper motor 16 rotates, it drives the toothed belt to move, and the bearing 13 equipped with the distance indicator 8 will move upward (or downward, determined by the rotation direction of the stepper motor 16), and also drives the photoelectric encoder 15 to rotate. The current position of the distance indicator 8 can be obtained by decoding the signal of the photoelectric encoder 15 with a single-chip microcomputer. The position difference of the photoelectric encoder 15 before and after the test is the falling distance.

[0040] The distance measuring device suitable for the drop impact test of the present invention has a reasonable structural design, is simple to use, easy to operate, and runs stably and reliably, and the measurement result is more accurate. It can be attached to the original test device or run independently without affecting the use of the original system. It adopts a non-contact measurement method, is easy to use, has high measurement accuracy, and improves the safety of the entire test device. It provides an efficient and reliable special measurement device for measuring the falling distance of a test simulator during a safety belt drop impact test.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A distance measuring device suitable for a drop impact test, characterized in that: It comprises a guide rail arranged in a vertical direction, a distance indicator slidably arranged on the guide rail, and a driving device driving the distance indicator to move along the guide rail; the driving device comprises a connecting belt connected to the distance indicator, a power mechanism driving the connecting belt to move, and a control mechanism controlling the operation of the power mechanism; The driving device further includes a counterweight connected to the other end of the connecting belt; the distance measuring device further includes an auxiliary guide rail for limiting the movement of the counterweight; The guide rail is provided with a bearing capable of sliding along the guide rail, the distance indicator is mounted on the bearing, and the connecting belt is connected to the bearing; the distance indicator is used to emit an indication line toward the simulated person, and the indication line is arranged horizontally; a guide wheel for guiding the movement of the connecting belt is also arranged on the movement path of the connecting belt; The distance measuring device includes a ruler arranged corresponding to the distance indicator, through which the moving distance of the distance indicator is obtained; a photoelectric encoder is also arranged on the moving path of the connecting belt, through which the moving distance of the distance indicator is obtained; the photoelectric encoder is installed between the power mechanism and the guide wheel; The connecting belt is a toothed belt matching the power mechanism; the power mechanism is a stepping motor.

2. A distance measuring device suitable for a drop impact test according to claim 1, characterized in that: The distance measuring device further comprises a shell for accommodating the driving device, and the shell is provided with a movement hole for the connecting belt to pass through.

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