CN212780864U

CN212780864U - Signal acquisition indicating device and rotating speed indicator

Info

Publication number: CN212780864U
Application number: CN202022221236.1U
Authority: CN
Inventors: 林翔; 赵宝康; 陈伟; 黄龙伟; 李光达
Original assignee: Sichuan Xinchuan Aviation Instrument Co ltd
Current assignee: Sichuan Xinchuan Aviation Instrument Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-03-23
Anticipated expiration: 2030-09-30

Abstract

The utility model discloses a signal acquisition indicating device and rotational speed indicator. The rotating speed indicator comprises an indicating component, a stepping motor and a CPU (central processing unit) used for connecting a rotating speed sensor; the CPU processor is provided with a driving circuit for converting a rotating speed signal acquired by the rotating speed sensor into a stepping frequency of the stepping motor and a compensating circuit for providing the stepping motor with a compensating stepping frequency; the indication component is arranged at the output end of the stepping motor, and the CPU processor is electrically connected with the input end of the stepping motor through the driving circuit and the compensation circuit. The rotating speed indicator drives the stepping motor to rotate through the driving circuit processed by the CPU, and provides compensation for the stepping motor through the compensation circuit of the CPU processor so as to eliminate accumulated errors generated by the stepping motor in continuous operation and improve the indicating precision.

Description

Signal acquisition indicating device and rotating speed indicator

Technical Field

The utility model relates to a measure the field, especially relate to a rotational speed indicator. Still relate to a signal acquisition indicating device, include above-mentioned rotational speed indicator.

Background

The pointer type indicator is an indicating device that indicates a numerical value by an angle of rotation of a pointer. The pointer instrument has the advantages of visual display, reliable work, low price and the like, and is widely applied to products such as various electrical instruments, other industrial instruments, speedometers used on vehicles, clocks used in daily life and the like.

The stepping motor is one of important structures in a needle type indicator, and can convert a received electric pulse signal into a corresponding angular displacement or linear displacement and output the corresponding angular displacement or linear displacement. That is, the rotor of the stepping motor rotates one angle or one step forward every time the stepping motor receives a pulse signal, and thus, the angular displacement or linear displacement output by the stepping motor is proportional to the number of received pulses, i.e., the rotational speed of the output shaft of the stepping motor is proportional to the pulse frequency.

However, the pointer type indicator having the stepping motor also has a problem of low indication accuracy based on the structural characteristics of the pointer type indicator, and therefore, how to improve the indication accuracy of the pointer type indicator becomes a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a rotational speed indicator can improve the instruction precision. Another object of the utility model is to provide a signal acquisition indicating device, including above-mentioned rotational speed indicator.

In order to achieve the above object, the present invention provides a rotation speed indicator, which comprises an indicating component, a stepping motor and a CPU processor for connecting a rotation speed sensor; the CPU processor is provided with a driving circuit for converting a rotating speed signal acquired by the rotating speed sensor into a stepping frequency of the stepping motor and a compensating circuit for providing a compensating stepping frequency for the stepping motor; the indication assembly is arranged at the output end of the stepping motor, and the CPU processor is electrically connected with the input end of the stepping motor through the driving circuit and the compensation circuit.

Preferably, a gear transmission part is connected between the indicating component and the output end of the stepping motor.

Preferably, the system also comprises a signal conditioning circuit with a D trigger; the output end of the signal conditioning circuit is connected to the CPU processor.

Preferably, the CPU processor is connected with a power supply circuit, a power-on return-to-zero circuit and/or a power-off return-to-zero circuit.

Preferably, the power supply circuit comprises a DC/DC power supply module, a filter and an energy storage capacitor.

Preferably, the indicating assembly, the stepping motor and the CPU processor are all disposed in an indicator housing; the indicator housing includes a transparent housing located outside of the indicating assembly.

Preferably, the indicating assembly comprises a dial and a pointer; the pointer is arranged on an output shaft of the stepping motor; and a lighting device is arranged below the dial.

Preferably, the indicator housing is in the shape of a cylindrical cavity, and the transparent housing is arranged in one axial end of the indicator housing and fixed along the radial extension of the indicator housing.

The utility model also provides a signal acquisition indicating device, including speed sensor and last speed indicator.

Preferably, the rotation speed sensor is specifically a rotation speed magnetic sensor.

Compared with the prior art, the utility model provides a rotational speed indicator is including instructing subassembly, step motor and being used for connecting speed sensor's CPU treater. Wherein, instruct the subassembly to install in step motor's output, the CPU treater is connected in step motor's input.

In the rotating speed indicator, a CPU processor is connected with a rotating speed sensor used for acquiring a workpiece to be measured. The CPU processor is provided with a driving circuit and a compensating circuit, wherein the driving circuit is used for converting a rotating speed signal acquired by the rotating speed sensor into a stepping frequency of the stepping motor, and the compensating circuit is used for providing a compensating stepping frequency for the stepping motor. The CPU processor is electrically connected with the input end of the stepping motor through a driving circuit and a compensating circuit and is used for providing a driving signal for the stepping motor.

The utility model provides a speed indicator utilizes the drive circuit realization of CPU treater to realize according to the step frequency of the rotational speed control step motor who waits to test the speed the work piece, makes step motor rotatory according to preceding step frequency. The indicating component is arranged at the output end of the stepping motor, and the pointer of the indicating component is driven to rotate when the stepping motor rotates, so that the pointer indicates the rotating speed of the workpiece to be tested. When the stepping motor works, the CPU processor provides a compensation stepping frequency for the stepping motor through the compensation circuit, so that the accumulated error of the stepping motor is eliminated, and the indication precision of the indication assembly is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a rotation speed indicator according to an embodiment of the present invention;

fig. 2 is a schematic block diagram of a rotation speed indicator according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a compensation circuit according to an embodiment of the present invention.

The device comprises a rotating speed sensor 01, an indicating component 1, a stepping motor 2, a CPU 3, a signal conditioning circuit 4, a power-off zero-returning circuit 5, a power circuit 6, a lighting circuit 7, a lighting circuit board 8, a driving circuit 9, a transparent shell 10, a pointer 11, a stepping motor circuit board 12, a signal conditioning circuit board 13, a power circuit board 14 and a driving circuit board 15.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a rotation speed indicator according to an embodiment of the present invention; fig. 2 is a schematic block diagram of a rotation speed indicator according to an embodiment of the present invention; fig. 3 is a schematic circuit diagram of a compensation circuit according to an embodiment of the present invention.

The utility model provides a rotation speed indicator, including indicating subassembly 1, step motor 2 and be used for connecting rotational speed sensor 01's CPU treater 3.

The CPU processor 3 is arranged at the input end of the stepping motor 2 and is used for processing the acquired rotating speed signal of the workpiece to be measured and transmitting the rotating speed signal to the stepping motor 2, so that the stepping frequency of the stepping motor 2 is controlled according to the rotating speed of the workpiece to be measured, and the stepping motor 2 rotates according to the stepping frequency. The indicating component 1 is arranged at the output end of the stepping motor 2, and the pointer 11 of the indicating component 1 is driven to rotate when the stepping motor 2 rotates, so that the pointer 11 indicates the rotating speed of a workpiece to be tested.

The CPU processor 3 is connected to the output end of the rotation speed sensor 01. The CPU processor 3 is provided with a drive circuit 9 and a compensation circuit. The rotating speed sensor 01 collects a frequency signal of the workpiece to be measured in a rotating state, the frequency signal is in direct proportion to the rotating speed of the workpiece to be measured, and the rotating speed of the workpiece to be measured can be calibrated. The drive circuit 9 of the CPU processor 3 controls the rotation of the stepping motor 2 according to this frequency signal. There is accumulative error when considering that step motor 2 drives pointer 11 and rotates, in order to eliminate this error, the utility model provides an among the rotational speed indicator, CPU processor 3 provides compensation step frequency to step motor 2 through compensating circuit to eliminate step motor 2's accumulative error.

The compensation step frequency may be a preset compensation value, and the compensation circuit is configured to provide the compensation step frequency to the stepping motor 2 according to the preset compensation value. In other words, the rotation speed indicator is determined at the beginning of production and assembly, and the stepping motor 2 rotates a certain angle at intervals of a certain rotation amount under the action of the compensation circuit, so as to ensure that the stepping motor 2 eliminates the error accumulated before; or may be a compensation value provided in real time according to the actual rotation state of the stepping motor 2.

For the compensation circuit, reference is also made to the circuit diagram shown in fig. 3. The rotating speed indicator collects actual driving voltage signals for driving the stepping motor 2 to rotate in real time, and when the actual driving voltage signals of the stepping motor 2 deviate from target driving voltage signals output by the driving circuit 9, the compensation circuit recalibrates the rotating angle of the stepping motor 2 according to the voltage deviation amount of the actual driving voltage signals and the target driving voltage signals so as to compensate the rotating angle in real time and further realize quick and effective high-precision indication.

For the driving circuit 9, a CMOS integrated circuit may be used, an input end of which receives a pulse signal, and an output end of which is used to connect and control an output shaft of the stepping motor to rotate in micro steps, each pulse signal rotates 0.083 ° corresponding to the output shaft of the stepping motor, and the indicating accuracy of the pointer can reach 0.1% in combination with the unit of the geometric angle of the dial. In addition, the driving circuit 9 can also adopt a high-precision power supply with the output precision not greater than 0.04% to prevent the influence of power supply fluctuation on the rotation of the stepping motor and further influence the pointer indication.

It can be seen that the utility model provides a rotation speed indicator is rotatory through the common drive step motor 2 of CPU treater 3 that has drive circuit 9 and compensating circuit, has realized the accurate instruction to the fast work piece that awaits measuring.

The rotation speed indicator provided by the present invention will be further described with reference to the accompanying drawings and embodiments.

The utility model provides an among the speed indicator, be connected with gear drive spare between instruction subassembly 1 and step motor 2's the output, that is to say, step motor 2's output shaft drives gear drive spare rotatory, and then drives the pointer 11 rotation of instruction subassembly 1 in order to instruct the rotational speed.

As for the gear transmission member, it may be provided according to the related structure in the prior art.

Since the stepping motor 2 drives the indicating component 1 to rotate through the gear transmission member, for the rotating speed indicator, in addition to the movement of the stepping motor 2, the gear transmission member can generate more or less accumulated errors. The rotation speed indicator can provide corresponding compensation according to the error actually brought by the gear transmission piece in the whole device, for example, a circuit which is the same as or similar to the compensation circuit in the previous embodiment is adopted, or compensation of the rotation angle of the indicating component 1 by the stepping motor 2 is realized by utilizing the compensation software of the CPU 3.

Further, the utility model provides a rotational speed indicator is still including the signal conditioning circuit 4 that has the D trigger, and the output of signal conditioning circuit 4 is connected in CPU treater 3. In this embodiment, the rotation speed signal of the workpiece to be measured, which is acquired by the rotation speed sensor 01, is first subjected to signal processing by the signal conditioning circuit 4, and then transmitted to the CPU processor 3.

Based on the setting of the rotation speed sensor 01 in the prior art, the rotation speed signal obtained by the rotation speed sensor 01 is usually a frequency voltage signal of an approximate sine wave, and the signal conditioning circuit 4 processes the rotation speed signal into a square wave signal, filters out a high-frequency interference signal therein according to the frequency bandwidth requirement of the CPU processor 3, and controls the voltage of the square wave signal within the acceptable range of the CPU processor 3.

The D flip-flop in the signal conditioning circuit 4 can perform delay sampling on the square wave signal, thereby effectively filtering out glitches and jitter signals.

To the utility model discloses CPU treater 3 that adopts, it is connected with power supply circuit 6, goes up the electricity and returns zero circuit and/or outage and return zero circuit 4. The power supply circuit 6 is used for supplying power to each electric device in the rotating speed indicator by using external electric energy; the power-up zero-return circuit and the power-down zero-return circuit can respectively ensure that the pointer 11 of the rotating speed indicator returns to zero when being powered up and returns to zero when being powered down. Taking the power-on zero-returning circuit as an example, the circuit board provided with the power circuit 6 may be provided with an energy storage capacitor, and the energy storage capacitor is used for providing electric energy to the pointer 11 when the power is off, so as to ensure that the pointer 11 returns to the zero point. The power-on zero-returning circuit and the power-off zero-returning circuit can adopt a trapezoidal speed control curve of acceleration-uniform speed-deceleration, so that the pointer 11 is prevented from shaking due to inertia, and the effect of preventing the pointer 11 from rebounding when returning to zero is achieved. In addition, the output pulses provided by the CPU processor 3 to the stepper motor 2 may also take the form of a trapezoidal speed control curve.

The utility model discloses power supply circuit 6 that adopts includes DC/DC power module, wave filter and energy storage electric capacity. The filter is used for filtering and preventing spikes and surges; the energy storage capacitor is used for acting as a standby power supply when the rotating speed indicator is abnormally powered off.

In the rotating speed indicator, an indicating component 1, a stepping motor 2 and a CPU (central processing unit) processor 3 are all arranged in an indicator shell; the indicator housing comprises a transparent housing 10 located outside the indicating assembly 1. The transparent shell 10 is arranged next to the indicating assembly 1, so that a user can visually acquire the position of the pointer 11 in the indicating assembly 1 relative to the dial through the transparent shell 10, and accordingly, the rotating speed can be read.

For convenience of use, the rotating speed indicator is improved in application occasions, and the indicating assembly 1 is provided with an illuminating device below the dial plate. The lighting means may be formed by a plurality of LED bulbs arranged below the dial to provide uniform illumination of the dial and the pointer 11.

The rotating speed indicator also comprises a rear seat plate arranged at the tail part of the rotating speed indicator and an assembly part thereof, and the rear seat plate is used for realizing the positioning and the installation of the rotating speed indicator.

Illustratively, the indicator housing is in the form of a cylindrical cavity, and the transparent housing 10 is disposed in one axial end of the indicator housing and fixed to the indicator housing in a radially extending manner. The inside of the indicator shell is provided with a plurality of groups of bushings and pillars for respectively positioning and installing a stepping motor circuit board 12, a signal conditioning circuit board 13 provided with a signal conditioning circuit 4, a power circuit board 14 provided with a power circuit 6, a driving circuit board 15 provided with a driving circuit and a compensating circuit and an illumination circuit board 8 provided with an illumination circuit 7. The pillar near the tail of the indicator shell can be arranged on the rear seat plate assembly in an expanding riveting mode.

The utility model provides a rotational speed indicator acquires the frequency voltage signal of waiting to test the speed the work piece with magnetic sensor and passes through the filtering, takes care of the back, via 3 operation processing of CPU treater and export to step motor 2, realizes that step motor 2 is rotatory in order to match in the step frequency of waiting to test the speed the angular velocity of work piece, finally realizes that pointer 11's rotation stops on the rotational speed position that the calibrated scale corresponds.

The utility model also provides a signal acquisition indicating device, including speed sensor 01 and the rotational speed indicator as shown in any above-mentioned embodiment.

The speed sensor 01 is used for acquiring the speed of a workpiece to be measured, such as the wheel speed of a vehicle, the engine speed of an airplane or the rotor speed of a helicopter. In the signal acquisition indicating device, the rotating speed sensor 01 is specifically a rotating speed magnetic sensor.

It is right above the utility model provides a signal acquisition indicating device and rotational speed indicator have carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A rotating speed indicator is characterized by comprising an indicating component (1), a stepping motor (2) and a CPU (central processing unit) processor (3) connected with a rotating speed sensor (01); the CPU processor (3) is provided with a driving circuit (9) for converting a rotating speed signal acquired by a rotating speed sensor (01) into a stepping frequency of the stepping motor (2) and a compensating circuit for providing the stepping motor (2) with a compensating stepping frequency; the indication assembly (1) is installed at the output end of the stepping motor (2), and the CPU processor (3) is electrically connected with the input end of the stepping motor (2) through the driving circuit (9) and the compensation circuit.

2. A speed indicator according to claim 1, characterised in that a gear transmission is connected between the indicating assembly (1) and the output of the stepper motor (2).

3. A revolution indicator according to claim 1, characterized by further comprising a signal conditioning circuit (4) with a D flip-flop; the output end of the signal conditioning circuit (4) is connected to the CPU processor (3).

4. A speed indicator according to claim 1, characterised in that the CPU processor (3) is connected to a power supply circuit (6), a power-up return-to-zero circuit and/or a power-down return-to-zero circuit (5).

5. A speed indicator according to claim 4, characterised in that the power supply circuit (6) comprises a DC/DC power supply module, a filter and an energy storage capacitor.

6. A speed indicator according to claim 1, wherein the indicating assembly (1), the stepper motor (2) and the CPU processor (3) are all disposed within an indicator housing; the indicator housing comprises a transparent housing (10) located outside the indicating assembly (1).

7. A speed indicator according to claim 6, characterised in that the indicating assembly (1) comprises a dial and a pointer (11); the pointer (11) is arranged on an output shaft of the stepping motor (2); and a lighting device is arranged below the dial.

8. A rotation speed indicator according to claim 6, wherein the indicator housing is in the form of a cylindrical cavity, and the transparent housing (10) is disposed in an axial end of the indicator housing and fixed in a radial extension of the indicator housing.

9. A signal acquisition and indication device, characterized by comprising a rotation speed sensor (01) and a rotation speed indicator according to any one of claims 1 to 8.

10. The signal acquisition and indication device according to claim 9, characterized in that said rotation speed sensor (01) is in particular a rotation speed magnetic sensor.