CN203705279U - Speed detecting device - Google Patents

Abstract

The utility model relates to a speed measuring device, which is connected with an impact testing device, the impact testing device includes an impact drop hammer, and the speed measuring device includes a speed measuring sensor head, a fixed frame, a platform, a test scale and signal acquisition analysis assembly; the speed measuring sensing head is connected to the fixed frame; the fixed frame is connected to the platform; the platform is connected to the impact test device; the test scale is fixed on the outer surface of the impact drop weight, and the The impact and drop hammers move together; the signal acquisition and analysis component is connected with the speed sensor head. Compared with the prior art, the utility model has the advantages of being able to realize real and accurate knowledge of the impact velocity, impact energy and rebound velocity of the surface of the protective material when it is impacted.

Description

a speed measuring device

technical field

The utility model relates to the technical field of material analysis, in particular to a speed measuring device.

Background technique

With the continuous advancement of the modernization process, it is becoming more and more common for people to suffer from low-speed impact injuries such as high-altitude parabolic objects and vehicle collisions. In the aerospace and military fields, there are also aircraft impacts and non-penetrating damage to body armor. Protection requirements, research on the low-velocity impact resistance of different materials is one of the key issues that urgently need to be resolved.

Existing impact testing devices include pendulum type and drop weight type. In view of the limitation of test flexibility, drop weight impact testing machines are widely used. However, the traditional drop hammer impact testing machine mostly calculates the impact energy or impact velocity of the impact sample by setting the drop hammer height, ignoring the energy loss value of the drop hammer in the impact direction path, resulting in the obtained impact velocity parameter The value is inaccurate, especially when the falling weight height is set at a lower value, the error of the impact velocity value is large, which affects the judgment of the impact resistance of the protective material; The impact energy is related to the structural characteristics of the sample itself, so the impact energy can be divided into the rebound energy of the falling weight and the absorbed energy of the sample, while the traditional drop weight impact testing machine can only measure the geometric damage shape of the sample surface after impact, indirectly Qualitatively analyze the absorbed energy of the sample after impact, but cannot quantitatively determine the absorbed energy of the sample, let alone the rebound energy of the falling weight, so the data obtained by the existing falling weight impact testing machine cannot be fully and thoroughly understood Low-velocity impact resistance of protective materials.

Contents of the invention

The purpose of this utility model is to propose a speed measuring device that can realize the real and accurate knowledge of the impact velocity and rebound velocity of the protective material surface when it is impacted in order to overcome the defects of the above-mentioned existing impact testing device.

The purpose of this utility model can be achieved through the following technical solutions:

A speed measurement device, the speed measurement device is connected with an impact test device, the impact test device includes an impact drop hammer, and the speed measurement device includes a speed measurement sensor head, a fixed frame, a platform, a test scale and a signal acquisition and analysis component;

The speed measuring sensor head is connected with the fixed frame;

The fixing frame is connected to the platform;

The platform is connected with the impact testing device;

The test scale is fixed on the outer surface of the impact drop hammer and moves together with the impact drop hammer;

The signal acquisition and analysis component is connected with the speed sensor head.

The speed measuring sensor head includes a sending module for sending optical signals and a receiving module for receiving optical pulse coded signals, and the receiving module is connected with the signal acquisition and analysis component.

The fixed frame includes a fixed pipe clamp and a T-shaped connecting plate, and the speed measuring sensor head is fixed on the T-shaped connecting plate through the fixed pipe clamp.

The fixed pipe clip is fixed on the vertical edge of the T-shaped connecting plate.

The fixed pipe clamp is provided with a hoop for placing the speed sensor head.

The platform is an integrated panel formed by connecting a trapezoidal structural plate and a rectangular structural plate. Two rows of mounting holes are provided on the inner side of the trapezoidal structural plate near the short bottom, and the platform is installed through the The holes are connected to the fixing frame, the rectangular structural plate is provided with fixing holes, and the platform is connected to the impact testing device through the fixing holes.

The test scale is provided with a trigger code for triggering the signal acquisition and analysis component to start sampling.

The test scale is a diffraction grating or a reflective barcode.

The signal acquisition and analysis component includes a data analysis collector, a central control computer, and a signal transmission channel for transmitting signals. One end of the data analysis collector is connected to the speed sensor head through the signal transmission channel, and the other end is connected to the central control computer. .

Compared with the prior art, the utility model has the following advantages:

The existing impact test device calculates the impact energy or impact velocity of the impact sample by setting the height of the drop hammer, ignoring the energy loss value of the drop hammer in the impact direction path, resulting in inaccurate impact velocity parameters, especially The error of the impact velocity is large when the falling weight height is set low, which affects the judgment of the impact resistance of the protective material; and only through the indirect qualitative analysis of the impacted sample by measuring the geometric damage shape of the impacted sample surface The absorbed energy of the sample cannot be quantitatively determined, and the rebound energy of the falling weight is even more unknown. The speed measuring device of the utility model is connected with the impact testing device, and the speed measuring sensor head can accurately measure the impact speed at the moment before impacting the drop hammer on the sample and the speed at the moment of rebound after the impact, so as to avoid the energy consumption of the falling hammer in the impact direction path The interference can ensure the accuracy of the obtained impact velocity or impact energy parameter value, and at the same time, the rebound velocity of the falling hammer can be obtained, and then the rebound energy of the falling hammer and the absorbed energy of the sample can be obtained, which is beneficial to the low-speed impact resistance of the protective material. Conduct in-depth research. The difference between the impact energy and the rebound energy is the energy absorbed by the sample, and the utility model can quantitatively determine the energy absorbed by the sample.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the utility model device;

Fig. 2 is the schematic diagram of the utility model speed sensor head;

Fig. 3 is the schematic diagram of the utility model fixed frame;

Fig. 4 is the schematic diagram of the utility model platform;

Fig. 5 is a speed measurement flow chart of the utility model device.

Among them: 1. Speed sensor head; 2. Fixed frame; 3. Platform; 4. Test scale; 5. Impact drop hammer; 6. Signal acquisition and analysis component; 7. Data analysis collector; 8. Central control computer; 9 , signal transmission channel; 2-1, fixed pipe clamp 2-2, T-shaped connecting plate 2-3, pipe clamp installation hole; 2-4, waist-shaped installation hole; 3-1, trapezoidal structure plate; 3-2 , Rectangular structural plate.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the utility model, and the detailed implementation and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

As shown in Figure 1, a kind of speed measuring device, this speed measuring device is used in conjunction with impact testing device, and impact testing device comprises impact drop hammer 5, and speed measuring device comprises speed measuring sensing head 1, fixed mount 2, platform 3, test scale 4 and Signal acquisition and analysis component 6, the speed sensor head 1 is connected to the fixed frame 2, the fixed frame 2 is connected to the platform 3, the test scale 4 is fixed on the outer surface of the impact drop hammer 5, and moves together with the impact drop hammer 5, and the signal is collected and analyzed Component 6 is connected with speed sensor head 1 .

The speed sensor head 1 includes a sending module for sending optical signals and a receiving module for receiving optical pulse coded signals, and the receiving module is connected with the signal acquisition and analysis component 6 .

As shown in Figure 2-Figure 3, the fixed frame 2 includes a fixed pipe clamp 2-1 and a T-shaped connecting plate 2-2, the speed sensor head 1 is located in the hoop of the fixed pipe clamp 2-1, through the The clamp 2-1 is fixed on the T-shaped connecting plate 2-2, the diameter of the hoop of the fixed pipe clamp 2-1 is consistent with the diameter of the speed sensor head 1, and the fixed pipe clamp 2-1 is fixed on the T-shaped connecting plate 2 -2's vertical edge.

The T-shaped connecting plate 2-2 is provided with a pipe clamp mounting hole 2-3 and a waist-shaped mounting hole 2-4. The pipe clamp installation hole 2-3 fixes the speed sensor head 1 on the fixed frame 2. The diameter of the pipe clamp installation hole 2-3 is consistent with the diameter of the installation hole of the fixed pipe clamp bottom plate. The T-shaped connecting plate 2-2 passes through the waist The mounting holes 2-4 are fixed on the platform 3.

As shown in Figure 4, the platform 3 is an integrated plate formed by connecting a trapezoidal structural plate 3-1 and a rectangular structural plate 3-2. Two rows of Mounting hole, the mounting hole can choose different distances according to the actual test requirements, the platform 3 is connected with the fixing frame 2 through the mounting hole, a pair of fixing holes are arranged on the rectangular structural plate 3-2, and the platform 3 is connected with the impact test device through the fixing holes .

The test scale 4 is provided with a trigger code for triggering the signal acquisition and analysis system 6 to start sampling. The test scale 4 is a diffraction grating or a reflective barcode, and the length of the scale is fixed on the outer surface of the impact drop hammer 5 after accurate measurement, and can be tested with the impact. The impact drop hammer 5 of the device moves together.

The signal acquisition and analysis system 6 includes a data analysis collector 7, a central control computer 8 and a signal transmission channel 9 for transmitting signals. The signal transmission channel 9 may be a low-noise signal transmission cable; the data analysis collector 7 is connected to the speed sensor head 1 through the signal transmission channel 9, and is used to convert the signal to the central control computer 8 for storage, calculation and display after analog-to-digital conversion ; The central control computer 8 is connected to the data analysis collector 7 to start or stop the data collection.

When carrying out the low-speed impact test, the device is installed on the impact test device through the fixing hole of the platform 3 .

As shown in Figure 5, it is the flow chart of the velocity measurement of the utility model device: start the impact test device, the impact drop hammer 5 falls freely when the height is set, and when the test scale on the surface of the impact drop hammer enters the laser irradiation point of the velocity measurement sensor head 1 When within the range, the sending module of the speed measuring sensor head 1 sends an active signal to the test scale 4, and the test scale 4 reflects the active signal with the movement of the impact drop hammer 5 to form a pulse, and the receiving module of the speed measuring sensor head 1 receives the first signal of the test scale 4. After a trigger coding signal, the sampling signal of the data analysis collector 7 is triggered and starts sampling, and the receiving module of the speed sensor head 1 stops sampling after receiving the last trigger coding signal of the test scale 4; the sampling signal is transmitted through the signal The channel 9 is sent to the data analysis collector 7 for analog-to-digital conversion processing and then sent to the central control computer 8. The central control computer 8 performs mathematical calculations according to the duration of the sampling signal and the fixed length of the test scale 4 to obtain the impact velocity of the falling hammer 5 And rebound speed and record, store and display the data, and finally calculate the impact energy, rebound energy and material absorption energy according to the obtained impact speed and rebound speed.

Claims (9)

1. a speed measuring device, this speed measuring device is connected with apparatus for impact testing, described apparatus for impact testing comprises impacting and drops hammer (5), it is characterized in that: described speed measuring device comprises the sensing head that tests the speed (1), fixed mount (2), platform (3), test scale (4) and signal processing and analysis assembly (6);

The described sensing head that tests the speed (1) is connected with fixed mount (2);

Described fixed mount (2) is connected on platform (3);

Described platform (3) is connected with apparatus for impact testing;

Described test scale (4) is fixed on to impact and drops hammer on (5) outside surface, with impact (5) associated movement that drops hammer;

Described signal processing and analysis assembly (6) is connected with the sensing head that tests the speed (1).

2. speed measuring device according to claim 1, it is characterized in that: the described sensing head that tests the speed (1) comprises the sending module that sends light signal and the receiver module that receives light pulse coded signal, and described receiver module is connected with signal processing and analysis assembly (6).

3. speed measuring device according to claim 1, it is characterized in that: described fixed mount (2) comprises a Duct fixing clamp (2-1) and a T-shaped connection plate (2-2), the described sensing head that tests the speed (1) is fixed on T-shaped connection plate (2-2) by Duct fixing clamp (2-1).

4. speed measuring device according to claim 3, is characterized in that: described Duct fixing clamp (2-1) is fixed on the vertical edge edge of T-shaped connection plate (2-2).

5. speed measuring device according to claim 3, is characterized in that: described Duct fixing clamp (2-1) is provided with the anchor ear for placing sensing head (1) of testing the speed.

6. speed measuring device according to claim 1, it is characterized in that: the integral type plate of described platform (3) for being formed by connecting by a trapezium structure plate (3-1) and a rectangle structure plate (3-2), described trapezium structure plate (3-1) is upper is provided with two row's mounting holes near inner side, short base, described platform (3) is connected with fixed mount (2) by this mounting hole, described rectangle structure plate (3-2) is provided with fixed orifice, and described platform (3) is connected with apparatus for impact testing by fixed orifice.

7. speed measuring device according to claim 1, is characterized in that: described test scale (4) is provided with the triggering coding that starts sampling for trigger pip collection analysis assembly (6).

8. speed measuring device according to claim 7, is characterized in that: described test scale (4) is diffraction grating or reflecting bar code.

9. speed measuring device according to claim 1, it is characterized in that: described signal processing and analysis assembly (6) comprises data analysis collector (7), cruise Control Module (8) and the signal transmission passage (9) for signal transmission, described data analysis collector (7) one end connects by signal transmission passage (9) sensing head (1) that tests the speed, and the other end connects cruise Control Module (8).