Automatic rotational inertia measuring device

Abstract

The utility model discloses an automatic rotational inertia measuring device, which comprises a shell. The motor is arranged in the shell; the rotary table penetrates through the top surface of the shell and is connected to the motor, and a photoelectric timing mechanism is arranged between the rotary table and the shell; and the control panel is arranged on the shell and is used for controlling the motor to work. According to the utility model, the structure of the measuring device can be simplified, the manufacturing cost of the measuring device can be greatly reduced, the labor intensity of manual operation is reduced, the measured data can be visually presented, and the use is flexible and convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic rotation inertia measuring device. BACKGROUND

[0002] Rotation inertia is the basic quantity in the structural dynamics and kinematics calculation problem, and is widely applied in all kinds of engineering related to mechanics. Rotation inertia is the physical quantity for describing the inertia of rigid body rotation around the axis, and is an indispensable data for rotation construction in industry. Currently, rotation inertia is mainly obtained by two ways: 1. Theoretical calculation, which is suitable for simple regular structure, and can directly calculate by using the theoretical method and formula about rotation inertia in theoretical mechanics; 2. Experimental measurement, which can obtain the rotation inertia of complex structure by targeted experimental measurement. When the object is irregular, it can only be measured by experimental method.

[0003] Currently, rotation inertia instrument mainly focuses on: falling body method, torsion pendulum method, line pendulum method and some instruments with potential energy storage to manufacture constant torque or equivalent torque, or to indirectly calculate and measure by parallel axis theorem. Such method has larger demand for human operation, increases the labor intensity of manual operation, and has higher cost of instrument. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at the deficiency of prior art to provide the technical scheme of automatic rotation inertia measuring device, which can not only simplify the structure of measuring device, but also greatly reduce the manufacturing cost of measuring device, reduce the labor intensity of manual operation, intuitively present the measurement data and use flexibly and conveniently.

[0005] In order to solve the above technical problem, the utility model adopts the following technical scheme:

[0006] The automatic rotation inertia measuring device has the characteristics that it comprises

[0007] A shell;

[0008] A motor, which is arranged in the shell;

[0009] A turntable, which penetrates the top surface of the shell and is connected to the motor, and a photoelectric timing mechanism is arranged between the turntable and the shell;

[0010] And a control panel, which is arranged on the shell and is used for controlling the motor to work.

[0011] Through the above structure design, the structure of measuring device can be simplified, the manufacturing cost of measuring device can be greatly reduced, the labor intensity of manual operation can be reduced, the measurement data can be intuitively presented, and the device is flexible and convenient to use.

[0012] Further, the photoelectric timing mechanism comprises a grating, a photoelectric gate and a photoelectric sensor, the grating is arranged at the bottom of the turntable and rotates synchronously with the turntable, the photoelectric gate is arranged in the shell, and the photoelectric sensor is embedded in the photoelectric gate; when the grating rotates along the photoelectric gate, the photoelectric sensor detects a signal and outputs high and low levels; when the photoelectric gate is blocked, the high level can be outputted, and when the photoelectric gate is transparent, the low level can be outputted; the width of the light blocking piece on the grating is equal to that of the transparent hole, so that the level is changed once and the time is recorded once every time, and the recorded time is the time when the turntable rotates through a certain angle.

[0013] Further, the control panel is provided with a circuit board, the circuit board is provided with a main chip, a secondary chip, an analog-digital conversion chip, a Hall current sensor, a constant current source module and a main-secondary chip communication structure, the main chip communicates with the secondary chip through the main-secondary chip communication structure, the main chip is electrically connected with the photoelectric sensor and the constant current source module, the secondary chip is connected with the Hall current sensor through the analog-digital conversion chip, the Hall current sensor is electrically connected with the constant current source module, the main-secondary chip communication structure adopts eight one-way information transmission channels of NAND gate structure, through the design of the above structure, when the active level changing end is high, the passive level changing end is also high, when the active level changing end is low, the passive level changing end is also low, and signal transmission and data transmission are realized.

[0014] Further, the main chip and the secondary chip both adopt STC89C52 single-chip microcomputers.

[0015] Further, the outer side of the control panel is provided with a main display, a secondary display, buttons and knobs, the main display, the buttons and the knobs are electrically connected with the main chip, and the secondary display is electrically connected with the secondary chip.

[0016] Further, the shell is provided with a charging port and a switch, the charging port and the switch are electrically connected with the control panel and the motor, and the bottom of the shell is provided with a supporting block for horizontally placing the measuring device.

[0017] The utility model discloses have the following beneficial effects because of adopting the above technical scheme:

[0018] The utility model discloses can not only simplify the structure of measuring device, but also can greatly reduce the manufacturing cost of measuring device, reduce the labor intensity of manual operation simultaneously, and the intuitive presentation of measurement data is convenient, and the use is flexible and convenient. DRAWINGS:

[0019] The utility model makes further explanation from the following:

[0020] Figure 1 It is the structural schematic diagram of automatical rotation inertia measuring device of the utility model;

[0021] Figure 2 It is Figure 1 It is the structural schematic diagram of rear side.

[0022] Figure 3 It is the internal structure schematic view of the utility model;

[0023] Figure 4 It is the connection schematic view of grating and rotary table in the utility model;

[0024] Figure 5 It is the structure schematic view of photoelectric timing mechanism in the utility model;

[0025] Figure 6 It is the circuit block diagram in the utility model;

[0026] Figure 7 It is the circuit diagram of main chip in the utility model;

[0027] Figure 8 It is the circuit diagram of vice chip in the utility model;

[0028] Figure 9 It is the flow chart of measurement method in the utility model;

[0029] Figure 10 It is the relationship diagram between motor output torque and armature in the utility model.

[0030] In the drawing: 1-rotary table; 2-casing; 3-control panel; 4-supporting block; 5-motor; 6-photoelectric gate; 7-photoelectric sensor; 8-grating; 9-charging port; 10-switch. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] In order for the person skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, not necessarily to describe a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0034] AsFigures 1 to 8 The utility model discloses an automatic rotation inertia measuring device, including shell 2, motor 5, turntable 1 and control panel 3, motor 5 is located in the shell 2.

[0035] The turntable 1 penetrates the top surface of the shell 2 and is connected to the motor 5. An optical timing mechanism is arranged between the turntable 1 and the shell 2.

[0036] The optical timing mechanism includes a grating 8, a photoelectric gate 6 and a photoelectric sensor 7. The grating 8 is arranged at the bottom of the turntable 1 and rotates synchronously with the turntable 1. The photoelectric gate 6 is arranged in the shell 2, and the photoelectric sensor 7 is embedded in the photoelectric gate 6. When the grating 8 rotates along the photoelectric gate 6, the photoelectric sensor 7 detects the signal and outputs high and low levels. When the photoelectric gate 6 is blocked, it can output high level, and when it is transparent, it can output low level. The width of the light blocking piece on the grating 8 and the transparent hole is equal, so that the level change is recorded once every time, and the recorded time is the time when the turntable 1 rotates through a certain angle.

[0037] The control panel 3 is arranged on the shell 2 and is used to control the operation of the motor 5.

[0038] The control panel 3 is provided with a circuit board, which is provided with a main chip, a secondary chip, an analog-digital conversion chip, a Hall current sensor, a constant current source module and a main-secondary chip communication structure. The main chip communicates with the secondary chip through the main-secondary chip communication structure. The main chip is electrically connected with the photoelectric sensor 7 and the constant current source module. The secondary chip is connected with the Hall current sensor through the analog-digital conversion chip. The Hall current sensor is electrically connected with the constant current source module. The main-secondary chip communication structure adopts an one-way information transmission channel with eight NOT gate structures. Through the above structure, when the active level changing end is high, the passive level changing end is also high. When the active level changing end is low, the passive level changing end is also low. Signal transmission and data transmission are realized.

[0039] Both the main chip and the secondary chip adopt STC89C52 single-chip microcomputer. The analog-digital conversion chip adopts ADC0809. The Hall current sensor adopts WCS2702.

[0040] The outer side of the control panel 3 is provided with a main display, a secondary display, buttons and knobs. The main display and the buttons and knobs are electrically connected with the main chip. The secondary display is electrically connected with the secondary chip. Both the main display and the secondary display adopt LCD1602.

[0041] The shell 2 is provided with a charging port 9 and a switch 10, which are electrically connected with the control panel 3 and the motor 5. The bottom of the shell 2 is provided with a support block 4 for horizontally placing the measuring device.

[0042] Through the design of the above structure, the structure of the measuring device can be simplified, the manufacturing cost of the measuring device can be greatly reduced, the labor intensity of manual operation is reduced, the intuitive presentation of the measurement data is facilitated, and the use is flexible and convenient.

[0043] The physical detection effect generated by the measuring device is determined by the motor, the rotary table with the grating, and the photoelectric sensor.

[0044] The motor adopts a motor with a constant torque constant, which can be given by the motor manufacturer. The torque constant is the ratio of the output torque of the motor to the current size passing through the motor, which is determined by the motor structure and material performance. The value is irrelevant to the current size, and is only related to the aging degree and rotation state of the motor.

[0045] The light transmission hole angle of the grating is 3.6°, and the light blocking piece angle is 3.6°. Taking the distance from the rotation center r = 50 mm as an example, the width of the light transmission hole and the light blocking piece is calculated.

[0046] The photoelectric sensor of the photoelectric door outputs two different levels in the light blocking state and the light transmission state. Since the width of the light transmission hole and the light blocking piece is the same, the time interval of the first level change is the time when the rotary table rotates by 3.6°.

[0047] When the measuring device measures the physical quantity of rotational inertia:

[0048] I. Original physical quantity:

[0049] 1. Influence of motor torque constant and motor friction on motor output torque:

[0050] Motor torque constant: Kt (N*cm / mA).

[0051] Motor friction: At low speed, the friction torque T of the rolling bearing is T0+k*ω, where ω represents the motor rotation angular velocity, and the unit of T is N*cm.

[0052] Other friction is a fixed value represented by T1, so T = T0+k*ω+T1.

[0053] The measuring device does not make technical innovations to the motor used, and existing motors can be used, but the parameters can be selected according to actual use requirements.

[0054] 2. Level change time interval: Δt (ms)

[0055] 3. Last level change time interval: Δt0 (ms)

[0056] 4. Current size passing through the motor: I (mA)

[0057] 5. The angle of rotation of the turntable: Δθ = 3.6°

[0058] II. Derivation of physical quantities:

[0059] 1. The angular velocity of the turntable ω

[0060]

[0061] 2. The acceleration of the turntable a

[0062]

[0063] 3. The output torque of the motor M

[0064] M = Kt * I - T = J * a.

[0065] 4. Moment of inertia (between two level changes)

[0066]

[0067] During the grating timing process, when the turntable starts to rotate, the first level change to the second level change is t0, the second level change to the third level change is t1, and the current value between the second level change and the third level change is taken. The angular velocity is taken between the second level change and the third level change. That is, after the grating starts to rotate, the second level change is calculated, the time before the first level change is left blank to prevent the different starting angles of the motor from causing; Since this time cannot be used as data, another data collection is performed, that is, t0 between the first level change and the second level change is taken as the previous data for the first data calculation, t1 between the second level change and the third level change is taken, and so on. Recursive operation, after 400 times of calculation, the average value is taken to get the final value.

[0068] The same index in the array represents the same time:

[0069] Level change time interval [t0, t1, …, t 400 ]

[0070] Current between level changes [I1, …, I 400 ]

[0071] Angular velocity between level changes

[0072] Substitute into the formula

[0073]

[0074] Get [J1, …, J 400 ]

[0075] Finally, average values are taken to obtain the magnitude of the final moment of inertia J.

[0076] As Figure 9 shown, it is a measurement method of the automatic moment of inertia measuring device, comprising the following steps:

[0077] S1, main chip and vice chip initialization setting

[0078] a, the main chip and vice chip P1 pin to high level, the main chip P3.2 pin to high level, P3.3 pin to low level, turn off the motor 5 circuit, open the resistance circuit;

[0079] b, the main chip P2 pin 8 bit control constant current source module initialization, through the button and knob change resistance output analog signal to constant current source module output current size adjustment;

[0080] c, the main chip P3.0, P3.1 and P3.6 pin to high level, the button and knob and photoelectric sensor 7 lead pin set to receive state;

[0081] S2, main display and vice display initialization setting

[0082] The main chip is initialized and set to the content of the main display, and the vice chip is initialized and set to the content of the vice display.

[0083] When the main chip initializes and sets the content of the main display, the following steps are included:

[0084] a, the P3.5 pin of the main chip is set to low level, the P0.0 pin is set to high level, the P0 other pins are set to low level, the P3.4 pin is set to high level, and the delay is 5 ms after being set to low level, and the screen is cleared;

[0085] b, the P0.7 pin of the main chip is set to high level, the P0 other pins are set to low level, the P3.4 pin is set to high level, and the delay is 5 ms after being set to low level, and the cursor is defined at the beginning of the first line;

[0086] c, the P3.5 pin of the main chip is set to high level, the first line data is started to be written, the ASCII code of the character, i.e. eight binary numbers, is defined as the level information of the P0 eight pins, the P3.4 pin is set to high level, and the delay is 5 ms after being set to low level, a character is successfully displayed, the cursor is automatically moved one bit, and the next character is defined;

[0087] d. Define the pointer position of the second line character insertion, the P3.5 pin of the main chip is low, then the P0.6 and P0.7 pins are high, the other P0 pins are low, the P3.4 pin is high, and after a 5ms delay, the P3.4 pin is low, and the cursor is defined at the beginning of the second line;

[0088] e. The P3.5 pin of the main chip is high, and the writing of the second line data is started. The ASCII code of the character, i.e. the eight-bit binary number, defines the level information of the P0 eight pins, the P3.4 pin is high, and after a 5ms delay, the P3.4 pin is low, and a character is successfully displayed. The cursor is automatically moved one bit backward, and the next character is defined.

[0089] When the secondary chip initializes and sets the content of the secondary display, the following steps are included:

[0090] a. The P3.5 pin of the secondary chip is low, the P2.0 pin is high, the other P2 pins are low, the P3.4 pin is high, and after a 5ms delay, the P3.4 pin is low, and the screen is cleared.

[0091] b. The P2.7 pin of the secondary chip is high, the other P2 pins are low, the P3.4 pin is high, and after a 5ms delay, the P3.4 pin is low, and the cursor is defined at the beginning of the first line.

[0092] c. The P3.5 pin of the secondary chip is high, and the writing of the first line data is started. The ASCII code of the character, i.e. the eight-bit binary number, defines the level information of the P2 eight pins, the P3.4 pin is high, and after a 5ms delay, the P3.4 pin is low, and a character is successfully displayed. The cursor is automatically moved one bit backward, and the next character is defined.

[0093] d. Define the pointer position of the second line character insertion, the P3.5 pin is low, then the P2.6 and P2.7 pins are high, the other P2 pins are low, the P3.4 pin is high, and after a 5ms delay, the P3.4 pin is low, and the cursor is defined at the beginning of the second line.

[0094] e. The P3.5 pin is high, and the writing of the second line data is started. The ASCII code of the character, i.e. the eight-bit binary number, defines the level information of the P2 eight pins, the P3.4 pin is high, and after a 5ms delay, the P3.4 pin is low, and a character is successfully displayed. The cursor is automatically moved one bit backward, and the next character is defined.

[0095] S3. Button operation

[0096] a. When the left button in the button and knob is pressed, the P3.0 pin of the main chip changes from high to low. When the left button is released, the P3.0 pin of the main chip changes from low to high. The chip internally obtains the change signal and makes the corresponding next step response.

[0097] b. When the right button of the button and knob is pressed, the P3.1 pin of the main chip changes from high level to low level, and when the right button is released, the P3.1 pin of the main chip changes from low level to high level, the internal chip gets the change signal and makes the corresponding next step response;

[0098] S4, automatic measurement

[0099] a. Initial interface, when the left button of the button and knob is pressed, it is a zero setting process, and when the right button of the button and knob is pressed, it is a formal test process;

[0100] b. The main chip locks the current output size, the secondary chip receives the information returned by the analog-digital conversion chip, the main chip and the secondary chip start to receive the information returned by the photoelectric timing mechanism, the main chip turns off the resistance circuit, turns on the motor 5 circuit, and transmits real-time information with the secondary chip; The main chip fixes the current size output by the artificial control constant current source module through the eight pins of P2 unchanged;

[0101] c. The P3.2 pin of the secondary chip is set to low level, the P3.0 pin is set to low level, the P3.3 pin is set to low level, the P3.3 pin is set to high level, the P3.0 pin is set to high level, the P3.3 pin is set to low level, the P3.0 pin is set to low level, the data conversion and collection process of the analog-digital conversion chip is completed, after the collection is completed, the EOC pin of the analog-digital conversion chip is set to high level, driving the P3.1 pin of the secondary chip to high level, the P3.2 pin of the secondary chip to high level, at this time, the eight binary numbers of the P0 pin of the secondary chip receive the current value, and the current value is stored in the cache, the P3.2 pin of the secondary chip is set to low level, and the collection of current size analog-digital conversion is completed;

[0102] d. The Hall current sensor collects the current size in the motor 5 loop or resistance loop, and linearly outputs an analog signal to its own Vout pin, which is received by the IN-0 pin of the analog-digital conversion chip, so as to complete the collection;

[0103] e. When starting measurement, the P3.2 pin of the main chip is set to low level, the P3.3 pin of the main chip is set to high level, the current line is switched to the motor 5, and the Hall current sensor and the analog-digital conversion chip work together, the motor 5 starts to rotate with constant current, outputs constant torque, drives the turntable 1 to start rotating, and makes the grating 8 and the photoelectric gate 6 interact;

[0104] A low level pulse is transmitted from the P1.0 pin of the main chip to the P1.0 pin of the secondary chip, when the P1.2 pin of the secondary chip is set to low level to drive the P1.2 pin of the main chip to low level, it proves that the synchronization is successful, so that the secondary chip synchronously enters the data collection mode;

[0105] The grating 8 rotates to start data collection. When the light is blocked, the photoelectric gate 6 LIGHT_GATE pin is at low level, the P1.0 pin of the main chip is at low level, and the P1.0 pin of the secondary chip is at low level. When the light is transparent, the photoelectric gate 6 LIGHT_GATE pin is at high level, the P1.0 pin of the main chip is at high level, and the P1.0 pin of the secondary chip is at high level.

[0106] Whenever the P3.6 pin of the main chip changes in level, the internal counter of the main chip adds the time value between the two level changes to an array (time value).

[0107] Whenever the P1.0 pin of the secondary chip changes in level, the current value collected by the current analog-to-digital conversion chip is added to an array (current value). The data of the two arrays correspond one by one. After the time data in the main chip and the current value data in the secondary chip are collected, the P1.2 pin of the secondary chip drives the P1.2 pin of the main chip to high level.

[0108] After the time data in the main chip and the current value data in the secondary chip are collected, they are transmitted to the main chip for common operation. The level common change is realized through eight one-way information transmission channels with NAND gate structure between the main chip and the secondary chip.

[0109] The P1.0 and P1.1 pins of the main chip can drive the P1.0 and P1.1 pins of the secondary chip to change in level quickly and commonly. The P1.2 to P1.7 pins of the secondary chip can drive the P1.2 to P1.7 pins of the main chip to change in level quickly and commonly.

[0110] Take the P1.0 pin of the main chip driving the P1.0 pin of the secondary chip as an example: in the initial state, all levels are high. When the P1.0 pin of the main chip is at low level, the signal is inverted to high level by the NAND gate, and the high level acts on the MOSFET on this path to make it conductive. The P1.0 pin of the secondary chip is originally in an open circuit state and at high level. When the MOSFET is conductive, it is connected to the ground, making the P1.0 pin of the secondary chip at low level. Therefore, when the P1.0 pin of the main chip is at low level, the P1.0 pin of the secondary chip is at low level.

[0111] When the P1.0 pin of the main chip returns to high level, the signal is inverted to low level by the NAND gate, and the low level acts on the MOSFET on this path to make it non-conductive. The P1.0 pin of the secondary chip is originally in a conductive state and at low level. When the MOSFET is non-conductive, it is disconnected from the ground, making the P1.0 pin of the secondary chip return to high level. Therefore, when the P1.0 pin of the main chip is at high level, the P1.0 pin of the secondary chip is at high level.

[0112] S5, automatic calculation and result presentation

[0113] a. When the measurement is completed, press the right button in the button and knob to select the start calculation;

[0114] b. The main chip receives the current data from the secondary chip through the information transmission module, and calculates the measurement result of the rotational inertia: if it is a zero adjustment process, the result is defined as J0 and stored in the cache; if it is a formal measurement process, the result is subtracted from J0 and defined as J and stored in the cache; when it is a zero adjustment process, the screen presents the English word "zero adjustment successful" and gives the options of left button for re-zero adjustment and right button for start measurement; when it is a formal measurement process, the liquid crystal screen display process is called to present the data J (rotational inertia result) on the display screen;

[0115] c. The level information received by the P1.2 pin of the main chip returns to high level, and the secondary chip enters waiting. When the P1.1 pin of the main chip goes to low level, and at the next moment, the P1.0 pin goes to low level and the P1.1 pin goes to high level, the two chips are synchronized to enter the data transmission mode. Each four-digit current data in the current array is split into four binary numbers one by one, and the level of the P1.4 to P1.7 pins of the main chip is changed by changing the level of the P1.4 to P1.7 pins of the secondary chip to perform sequential transmission. In the transmission process, each data has four digits that need to be transmitted once respectively. The change of the P1.2 and P1.3 pins of the secondary chip indicates that the assignment is complete. After the first change and stabilization of the P1.4 to P1.7 pins of the secondary chip, the P1.2 and P1.3 pins of the secondary chip are set from high level to low level. The main chip receives the data and changes the level of the P1.1 pin. After receiving by the secondary chip, the next data transmission is performed, and the data is received in a synchronous loop.

[0116] d. When the array is completely transmitted, i.e. the data reception of the main chip is completed, the P1.0 pin of the main chip is set to high level, the data transmission is completed, and the time array and the current size array are stored in the main chip;

[0117] e. The code is used to perform calculation by formula, and assign zero value or present result. The measurement is completed.

[0118] The measurement method has simple steps, effectively solves the problems of high cost of rotational inertia measurement and not intuitive demonstration of the relationship between rotational inertia and torque in physics teaching, and proposes a more concise operation method, which is beneficial to more intuitive presentation of data.

[0119] The above are only specific embodiments of the present application, but the technical features of the present application are not limited to this. Any simple change, equivalent replacement or modification made on the basis of the present application to achieve basically the same technical effect is covered in the protection scope of the present application.

Claims

1. An automated moment of inertia measurement apparatus, characterized by: The utility model provides a kind of measuring device, including A shell; A motor, the motor is located in the shell; A turntable, the turntable penetrates the top surface of the shell, and is connected to the motor, and photoelectric timing mechanism is arranged between the turntable and the shell; And a control panel, the control panel is arranged on the shell, for controlling the motor work.

2. The automated moment of inertia measurement apparatus of claim 1, wherein: The photoelectric timing mechanism includes grating, photogate and photoelectric sensor, the grating is arranged in the bottom of the turntable, for synchronous rotation with the turntable, the photogate is arranged in the shell, and the photoelectric sensor is embedded in the photogate, when the grating rotates along the photogate, signal is detected by the photoelectric sensor and high-low level is output.

3. The automated moment of inertia measurement apparatus of claim 2, wherein: The control panel is provided with circuit board, the circuit board is provided with main chip, auxiliary chip, analog-digital conversion chip, hall current sensor, constant current source module and main auxiliary chip communication structure, the main chip communicates with the auxiliary chip by the main auxiliary chip communication structure, the main chip is electrically connected with the photoelectric sensor and the constant current source module, the auxiliary chip is connected with the hall current sensor by the analog-digital conversion chip, the hall current sensor is electrically connected with the constant current source module, and main auxiliary chip communication structure adopts eight NAND gate structure one-way information transmission channel.

4. The automated moment of inertia measurement apparatus of claim 3, wherein: The main chip and the auxiliary chip both adopt STC89C52 single-chip microcomputer.

5. The automated moment of inertia measurement apparatus of claim 3, wherein: The outside of the control panel is provided with main display, auxiliary display, button and knob, the main display and the button and knob are electrically connected with the main chip, and the auxiliary display is electrically connected with the auxiliary chip.

6. The automated moment of inertia measurement apparatus of claim 1, wherein: The shell is provided with charging port and switch, the charging port and the switch are electrically connected with the control panel and the motor, and the bottom of the shell is provided with support block, for horizontal placement of the measuring device.

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