CN211121856U - A three-wire pendulum period measuring device - Google Patents

Abstract

The utility model discloses a three-wire pendulum period measurement device, including three-wire pendulum, hall component group, pulse shaping circuit and controller, wherein, the three-wire is put and is provided with magnet, the three-wire pendulum drives reciprocating motion is to magnet, hall component group includes first hall element and second hall element, first hall element and second hall element are in three-wire pendulum effect down output pulse signal, pulse shaping circuit connection hall component group, the controller is connected pulse shaping circuit receives the pulse signal of pulse shaping circuit transmission is exported and is shown for the mode module. Through the phase difference of comparing two hall element output signal, can learn that three-wire pendulum motion number of times has the hourglass to survey, thereby improve the utility model discloses the rate of accuracy of test.

Description

A three-wire pendulum period measuring device

technical field

The utility model relates to the field of period measurement, in particular to a three-wire pendulum period measurement device.

Background technique

When studying the reciprocating motion of an object (such as a single pendulum, a three-wire pendulum, etc.), it is a key step to accurately measure the motion period of the object. In the prior art, the three-wire pendulum performs periodic motion and uses a photoelectric gate to measure the period. The door instrument adjustment is more complicated, and improper adjustment is easy to cause the problem of missed measurement, so the measurement accuracy is not high.

Utility model content

In order to solve the problem of low measurement accuracy of period measuring instruments in the prior art, the present invention provides a three-wire pendulum period measurement device, which can improve the period measurement accuracy of periodically moving objects.

A three-wire pendulum period measurement device, comprising:

Three-wire pendulum, a magnet is arranged on the three-wire pendulum, and the three-wire pendulum drives the magnet to reciprocate;

a hall element group, the hall element group includes a first hall element and a second hall element, and the first hall element and the second hall element output a pulse signal under the action of the three-wire pendulum;

a pulse shaping circuit, the pulse shaping circuit is connected to the Hall element group;

The controller is connected to the pulse shaping circuit, receives the pulse signal transmitted by the pulse shaping circuit, and outputs the pulse signal to the mode module for display.

Further, in a static state, the magnet faces the midpoint of the distance between the first Hall element and the second Hall element.

Further, the vertical distance between the Hall element group and the three-wire pendulum is 3-5 mm.

Further, the three-wire pendulum period measurement device further includes a communication interface, and the communication interface is connected to the controller.

Further, the pulse shaping circuit includes a Schmitt trigger, and the Schmitt trigger adopts an integrated chip.

Further, the output ends of the first Hall element and the second Hall element are respectively connected to the two input ends of the integrated chip, and the first output end and the second output end of the integrated chip are respectively connected to the control the input of the device.

Further, the three-wire pendulum period measurement device further includes a keyboard, and the keyboard is connected to the controller.

Further, the model used by the Hall element group is 31144A.

Further, the communication interface adopts an RS232 interface.

Compared with the prior art, the beneficial effects of the present utility model:

The utility model is provided with a hall element group, the hall element group includes a first hall element and a second hall element, a magnet is arranged on the three-wire pendulum, and when the three-wire pendulum drives the magnet to rotate and reciprocate, whenever the three-wire pendulum passes through The Hall element group, the Hall element group sends out a signal, after the pulse signal is obtained by amplifying and shaping, the output waveforms of the first Hall element and the second Hall element are displayed on the display module. By comparing the phase difference between the two pulse signals, the component collects signals, and it can judge whether the period measurement is accurate, which solves the problem of inaccurate period measurement in the prior art, so the utility model can effectively improve the accuracy rate of the period measurement.

Description of drawings

1 is a schematic block diagram of a three-wire pendulum period measuring device provided by an embodiment of the present utility model;

Fig. 2 is the output waveform of the Hall element group when the three-wire pendulum provided by the embodiment of the utility model moves clockwise;

FIG. 3 is the output waveform of the Hall element group when the three-wire pendulum moves counterclockwise according to the embodiment of the present invention.

4 is a circuit diagram of a pulse shaping circuit provided by an embodiment of the present invention;

5 is a circuit diagram of a controller provided by an embodiment of the present invention;

FIG. 6 is a circuit diagram of a display module provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1 shows a principle block diagram of a three-wire pendulum period measurement device provided by this embodiment. The three-wire pendulum period measurement device provided by this embodiment includes a three-wire pendulum, a Hall element group, a pulse shaping circuit, a controller, and a display module, wherein, A magnet is arranged on the three-wire pendulum, and the three-wire pendulum drives the magnet to reciprocate. The Hall element group includes a first Hall element A and a second Hall element B. The first Hall element A and the second Hall element B are in the three-wire pendulum. Under the action, the pulse signal is output, the pulse shaping circuit is connected with the Hall element group, the controller is connected with the pulse shaping circuit, and the pulse signal transmitted by the pulse shaping circuit is received and output to the display module for display. By comparing the phase difference of the output signals of the two Hall elements, it can be judged whether the period measurement is accurate, which solves the problem of inaccurate period measurement in the prior art, so the utility model can effectively improve the accuracy rate of the period measurement.

As a specific example of the three-wire pendulum in this embodiment, as shown in FIG. 1 , the three-wire pendulum provided in this embodiment includes an upper disc and a lower disc, a magnet is arranged on the lower disc, and the upper disc is supported by three wires to support the lower disc. The disc, when the three-wire pendulum rotates and reciprocates, drives the magnet to rotate and reciprocate.

Further, in the static state of the three pendulums, the magnet faces the midpoint of the distance between the first Hall element A and the second Hall element B, and the vertical distance between the Hall element group and the three-wire pendulum is 3-5 mm.

As a specific example of the Hall element group in this embodiment, as shown in FIGS. 1 and 4 , the model of the Hall element group provided in this embodiment is 3144A, which includes two Hall elements, respectively the first Hall element. Hall element A and the second Hall element B, when the three-wire pendulum rotates and reciprocates, the magnet passes through the Hall element group, so that the Hall element group generates the Hall electromotive force, and the output signal of the Hall element group is processed by the Schmitt trigger. After processing, the pulse period model is obtained. Specifically, the pulse period signal generation process is as follows:

When the three-wire pendulum swings clockwise, the magnet first passes through the first Hall element A, and then passes through the second Hall element B. At this time, the output signal waveform of the Hall element group is shown in Figure 2, and the output signal of the first Hall element A is ahead. The second Hall element B outputs a signal;

When the three-wire pendulum swings counterclockwise, the magnet first passes through the second Hall element B, and then passes through the first Hall element A. At this time, the output signal waveform of the Hall element group is shown in Figure 3, and the output signal of the second Hall element B is ahead. The first Hall element A outputs a signal.

Because the three-wire pendulum in this embodiment rotates and reciprocates, if there is no leakage detection, the pulse signals generated by the first Hall element A and the second Hall element B alternately lead. If the same output signal leads continuously, then Indicates that there is a missed test.

According to an embodiment of the present invention, as shown in FIG. 4 , the pulse shaping circuit includes a Schmitt trigger. In this embodiment, the Schmitt trigger adopts an integrated chip CD40106. Specifically, the output end of the first Hall element A is Connect pin 1 of the integrated chip, the output end of the second Hall element B is connected to the pin 3 of the integrated chip, and the pins 2 and 5 of the integrated chip are respectively connected to the input end of the control, the integrated chip is connected to the first Hall element A and the second The output signal of Hall element B is shaped into a pulse period signal, and the pulse period signal is transmitted to the controller.

It should be noted that the pulse shaping circuit provided in this embodiment may also adopt other circuits, and at the same time, this embodiment may also include a method circuit to amplify the pulse period, which is convenient for the display module to display.

According to an embodiment of the present invention, as shown in FIG. 5 , in this embodiment, the controller adopts STC8A8K64S4A12, and the controller outputs the pulse period signal to the display module for display. Of course, the controller in this embodiment can also choose other models, which is not limited too much.

Specifically, as shown in FIG. 6 , the display module in this embodiment includes a liquid crystal display screen, and the input terminal of the liquid crystal display screen is connected to the output terminal of the controller, and is used to display the pulse period signals of the two Hall elements, which is convenient for personnel to check the three-wire Whether the number of pendulum movements is missed.

Further, this embodiment further includes a communication interface, the communication interface is connected to the controller, the communication interface can be connected to an external storage device, and the controller outputs the received pulse period signal to the storage setting.

Specifically, the communication interface adopts the RS232 interface.

Further, this embodiment also includes a keyboard. In the embodiment, the keyboard adopts a 4*4 matrix keyboard, the keyboard is connected to the controller, and the periodic signal stored in the storage device can be retrieved through the keyboard, which is convenient for checking whether there is any missed test or Test for inaccurate phenomena.

To sum up, the three-wire pendulum period measurement device provided by the present utility model, by preventing the magnet directly above the midpoint of the distance between the two Hall elements, the magnet is placed in the three-wire pendulum. Each Hall element generates the Hall electromotive force in sequence, and the output signals of the two Hall elements are processed to form a pulse period signal.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. A three-wire pendulum cycle measuring device, comprising:

The three-wire pendulum is provided with a magnet and drives the magnet to do reciprocating motion;

The Hall element group comprises a first Hall element and a second Hall element, and the first Hall element and the second Hall element output pulse signals under the action of the three-wire pendulum;

A pulse shaping circuit connected to the group of hall elements;

And the controller is connected with the pulse shaping circuit, receives the pulse signal transmitted by the pulse shaping circuit and outputs the pulse signal to the mode module for display.

2. The three-wire pendulum cycle measuring device of claim 1, wherein the magnet faces a midpoint of a gap between the first hall element and the second hall element in a rest state.

3. The three-wire pendulum cycle measuring device of claim 1, wherein the hall element set is vertically spaced from the three-wire pendulum by 3-5 mm.

4. The three-wire pendulum cycle measurement device of claim 1, further comprising a communication interface, the communication interface coupled to the controller.

5. The three-wire pendulum cycle measurement device of claim 1, wherein the pulse shaping circuit comprises a schmitt trigger, and the schmitt trigger is an integrated chip.

6. The three-wire pendulum cycle measuring device of claim 5, wherein the output terminals of the first and second Hall elements are connected to two input terminals of the integrated chip, respectively, and the first and second output terminals of the integrated chip are connected to the input terminal of the controller, respectively.

7. The three-wire pendulum cycle measurement device of claim 1, further comprising a keyboard coupled to the controller.

8. The three-wire pendulum cycle measuring device of claim 2, wherein the hall element set is model 31144A.

9. The three-wire pendulum cycle measurement device of claim 4, wherein the communication interface is an RS232 interface.

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