CN204694725U - The determinator of Hopkinson pressure bar system take-off lever speed - Google Patents

Abstract

The utility model belongs to measurement mechanism technical field, especially a kind of determinator of Hopkinson pressure bar system take-off lever speed is related to, it is characterized in that being provided with a laser velocimeter device between Hopkinson pressure bar system take-off lever end and absorbing rod, this laser velocimeter device comprises laser flip flop, fixes the speed measuring device main body of two flip flop equipments of this laser flip flop.The utility model has the practical value of height, can when warranty test result, and improve experimental precision, reduce experiment difficulty, accurately obtain the loss part of energy, the improvement for Hopkinson pressure bar test has original innovation characteristic.

Description

Measuring device for output rod speed of Hopkinson compression rod system

technical field

The utility model belongs to the technical field of measuring devices, in particular to a measuring device for output rod speed of a Hopkinson pressure rod system.

Background technique

At present, split Hopkinson bar is an effective experimental setup to study the dynamic mechanical properties of materials under one-dimensional stress state. Since Kolsky invented it in 1949 and used it to study the dynamic mechanical properties of materials under one-dimensional stress state, the experimental device has been improved a lot, and the experimental technology has been continuously improved. The conventional Hopkinson pressure bar test device has only one set of speed measurement system, that is, in the input rod part, the kinetic energy of the input rod is calculated through the measured speed, that is, the total energy of the whole system, and the energy of the output rod needs to be obtained from the computer The difference between the two is the energy acting on the experimental specimen. However, due to the existence of systematic errors and human errors, the analysis of the lost energy will inevitably bring certain errors and errors. In particular, the Hopkinson compression rod test device cannot accurately and conveniently obtain the output rod energy, which makes the error of the experimental results larger.

Contents of the invention

The purpose of this utility model is to provide a measuring device for the speed of the output rod of the Hopkinson pressure rod system that can conveniently and accurately measure the energy of the output rod. The device can measure the speed of the output rod on the basis of the original measurement data, and can express The distribution of energy in the Hopkinson pressure bar test can guide the energy matching of explosives and rocks in actual engineering.

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

The measuring device for the speed of the output rod of the Hopkinson pressure rod system of the utility model is characterized in that a laser speed measuring device is arranged between the end of the output rod of the Hopkinson pressure rod system and the absorbing rod, and the laser speed measuring device includes a laser trigger , the main body of the speed measuring device that fixes the two triggering devices of this laser trigger.

The main body of the speed measuring device includes a main body support fixed to the base of the Hopkinson experimental device, and a fixing device fixed on the upper end of the main body support. A lower semicircle hole is provided respectively, and two upper semicircle holes are provided on the fixing device, and the two upper semicircle holes and the two lower semicircle holes respectively form two circular holes, and the emitter end of the laser trigger The head and the receiver end are respectively fixed in the two round holes, and the output rod of the Hopkinson pressure rod system passes through the groove.

Advantage of the utility model:

The measuring device of the output rod speed of the Hopkinson pressure rod system of the utility model has a high practical value, can improve the experimental accuracy, reduce the difficulty of the experiment, and accurately obtain the loss part of the energy under the condition of ensuring the test results, which is the Hopkinson The improvement of the compression bar test has unique innovative features.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the A-direction view of Fig. 1 of the present utility model.

Detailed ways

Further illustrate the specific embodiment of the present utility model below in conjunction with accompanying drawing.

As shown in Figures 1 and 2, the measuring device for the speed of the output rod of the Hopkinson pressure rod system of the present invention is characterized in that a laser speed measuring device is provided between the end of the output rod 1 of the Hopkinson pressure rod system and the absorbing rod 5 device, the laser speed measuring device includes a laser trigger 8, and fixes the main body of the speed measuring device of the two triggering devices of the laser trigger 8.

The main body of the speed measuring device includes a main body support 7 fixed to the base of the Hopkinson experimental device, and a fixing device 3 fixed on the upper end of the main body support 7. The middle part of the upper end of the main body support 7 is provided with a groove 6. Both sides of the groove 6 are respectively provided with a lower semicircle hole, and the fixing device is provided with two upper semicircle holes, and the two upper semicircle holes and the two lower semicircle holes form two circular holes respectively, and the laser The transmitter end 2 and the receiver end 4 of the trigger are respectively fixed in the two circular holes, and the output rod 1 of the Hopkinson pressure rod system passes through the groove 6 .

The utility model is improved on the basis of the existing Hopkinson experimental device. The method adopted is to install a laser speed measuring device at the end of the output rod 1 of the Hopkinson pressure rod system, and fix two trigger devices of the laser trigger. There is a signal time difference between the laser triggers, and its value is the output rod 1 of the Hopkinson pressure rod system. The movement time interval T is measured by the laser speed measuring device (composed of a laser transmitter and a laser receiver), and the distance between them is measured. L, because the distance between the lasers is short and the time is relatively short, according to the differential principle, this instantaneous speed can be considered as the average speed, and the speed V can be expressed by the ratio of the distance L to the time T. The mass M of the output rod is calculated to obtain the momentum P at the end of the output rod, and then the kinetic energy E is obtained. This yields the remaining energy E'. The specific theoretical formula is as follows:

(1)

(2)

(3)

In the formula: V—the speed of the output rod, m/s.

L—the distance between triggers, m.

T—the time difference recorded by the trigger time, s.

P - The momentum of the output rod, kg m/s.

E—the energy of the output rod, J.

In this laser speed measuring device, the output rod 1 of the Hopkinson pressure rod system can just pass between the speed measuring devices, and the center height of the output rod 1 of the Hopkinson pressure rod system is at the same level as the center height of the speed measuring device; the speed measuring device The speed of the output rod 1 of the Hopkinson pressure rod system can be accurately measured, and the distribution of energy in the entire system can be obtained through physical formula and energy map analysis, and then the matching of rock and explosive energy can be studied. The measuring device of the output rod speed of the Hopkinson pressure rod system of the utility model has a high practical value, can improve the experimental accuracy, reduce the difficulty of the experiment, and accurately obtain the loss part of the energy under the condition of ensuring the test results, which is the Hopkinson The improvement of the compression bar test has unique innovative features.

Claims (2)

1. A measuring device for the output rod speed of the Hopkinson pressure rod system, characterized in that a laser speed measuring device is provided between the end of the Hopkinson pressure rod system output rod and the absorbing rod, and the laser speed measuring device includes a laser trigger , the main body of the speed measuring device that fixes the two triggering devices of this laser trigger. 2. The measuring device of the Hopkinson pressure bar system output rod speed according to claim 1, it is characterized in that the main body of the speed measuring device comprises a main body support fixed with the Hopkinson experimental device base, fixed on this main body support The fixing device at the upper end of the seat, the middle part of the upper end of the main body support is provided with a groove, and a lower semicircular hole is respectively provided on both sides of the groove, and two upper semicircular holes are provided on the said fixing device. Two upper semi-circular holes and two lower semi-circular holes form two circular holes respectively. The transmitter end and receiver end of the laser trigger are respectively fixed in these two circular holes. The output rod of the Hopkinson pressure rod system through the groove.