CN108181375A - A kind of principal direction of stress determination method based on magnetic memory detection technology - Google Patents
A kind of principal direction of stress determination method based on magnetic memory detection technology Download PDFInfo
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Abstract
A kind of principal direction of stress determination method based on magnetic memory detection technology belongs to the stress oriented detection technical field of metal material more particularly to a kind of principal direction of stress determination method based on magnetic memory detection technology.The present invention provides a kind of principal direction of stress determination method based on magnetic memory detection technology.The present invention includes system and main program, stepper motor data acquisition routines, gathered data processing subprogram, binary-coded decimal conversion routine, LED display subroutines and the original value as interrupt service routine is called to acquire subprogram；It is raw value storage address that system, which calls main Cheng Caiyong assembler directive commands setting LINEADR,；ADTURN is gathered data storage area first address；SHOWADR is Data Position record value storage address, and SHOWADR1 is LED display datas ' ten ' storage address.
Description
Technical field
Stress oriented detection technical field more particularly to one kind the invention belongs to metal material are based on Magnetic memory testing skill
The principal direction of stress determination method of art.
Background technology
With the development of modern design awareness, metal has been applied to the every field of our lives, can be due to the damage of metal
Economic loss caused by wound also increases year by year.But general non-destructive testing technology can only detect the crackle formed or lack
It falls into, and early detection cannot be carried out to the fatigue rupture caused by stress concentration.And metal magnetic memory principle is ferromagnetic material
Magnetic and elastic interaction energy is formed under stress, makes intensity of magnetization reorientation, is sent out so as to cause magnetic field intensity
Changing achievees the purpose that measurement, so early detection can be carried out to metal material.Magnetic Memory research core theory be：Magnetic is remembered
Signal is recalled in its normal component H p (y) zero crossing of stress concentration position, and tangential component H p (x) have maximum value
The characteristics of；But we generally the characteristics of normal component H p (y) zero crossings, is studied it is more, and to tangential component H p (x
) having the characteristics that maximum value is studied less, this is primarily due to principal stress magnetic memory signal direction and is difficult to determine, i.e. principal stress
Direction is difficult to judge, so affecting the reliability of its research.
Invention content
The present invention addresses the above problem, provides a kind of principal direction of stress judgement side based on magnetic memory detection technology
Method.
To achieve the above object, the present invention adopts the following technical scheme that, the present invention includes system and calls main program, stepping electricity
Machine data acquisition routines, gathered data handle subprogram, binary-coded decimal conversion routine, LED display subroutines and are taken as interrupting
The original value acquisition subprogram for program of being engaged in；
It is raw value storage address that system, which calls main Cheng Caiyong assembler directive commands setting LINEADR,；ADTURN is gathered data
Storage area first address；SHOWADR is Data Position record value storage address, and SHOWADR1 is LED display datas ' ten ' storage
Address, SHOWADR2 are LED display datas ' a position ' storage address, and TAB is LED display segment code headings address, and TABLE is step
Stepper motor rotates forward heading address；
System calls main Cheng Shouxian to call stepper motor data acquisition routines, and multiple magnetic is acquired using stepper motor rotation angle
Signal, i.e. magnetic signal of the certain degree acquisition of often rotation, and gathered data is put into the data storage area that ADTURN is first address
In；Then gathered data processing subprogram is called to interrupt ADTURN with passing through respectively for numerical value in the data storage area of first address
（Original value acquires）The collected original value of subprogram is compared, and finds out the storage unit identical with original value, and will cycle
Number is stored in as Data Position record value in SHOWADR storage units, is waited to be called；Call " binary-coded decimal conversion routine " will
Binary code is converted to binary-coded decimal in SHOWADR storage units, and will be ' ten ' be stored in respectively with ' a position ' SHOWADR1,
SHOWADR2 storage units are medium to be called；" LED display subroutines " is finally called to store SHOWADR1, SHOWADR2 single
Member storage numerical value is shown in light-emitting diode display；
Stepper motor rotating forward heading address TABLE is put into data pointer DPTR by stepper motor data acquisition routines first,
Using R0 content of registers be set as 00H as stepper motor rotate initial value, using R0 content of registers be put into A-register wherein as
Pointer DPTR+A is directed toward content taking-up and is put into A-register, as exported needed for the stepper motor rotation first step by pointer offset amount
Value is exported the value in register A by the port being connect with stepper motor, then stepper motor just has rotated a step, that is, has rotated
Then R0 is directed toward next storage unit by certain angle；R1 is directed toward gathered data storage area first address ADTURN, starts IN0
Channel carries out a period of time to be collected such as A/D conversions, delay, and transformed number is put into R1 is directed toward area, and R1 is directed toward next deposit
Storage unit；Cycle is multiple in this way, and stepper motor has rotated certain angle, and sensor also acquires multiple data deposit storage
R0 content of registers is set as 00H and rotates initial value as stepper motor by area again, and systemic circulation is multiple again, such microcontroller
Certain degree is had rotated, sensor will also rotate the data deposit ADTURN repeatedly measured as in the memory block of first address；
R0 content of registers is set as 00H as cycle count initial value by gathered data processing subprogram first, and R1 is directed toward number
According to acquisition memory block first address ADTURN, R0 content of registers is added one, that is, set rotation first step Data Position record value as
' 1 ', it by R1 directions value compared with the acquired original value i.e. LINEADR storage unit values measured in advance, differs, R0, R1 is posted
Storage content continues cycling through after adding one respectively, identical to be then stored in SHOWADR using R0 content of registers as Data Position record value
In storage unit；
Result is put into SHOWADR1 storage lists by binary-coded decimal conversion routine first by SHOWADR memory cell contents divided by 10
In member, remainder is put into SHOWADR2 storage units, is thus converted to the binary numeral in SHOWADR storage units
Binary-coded decimal, and will be ' ten ' be put into SHOWADR1 storage units, ' a position ' is put into SHOWADR2 storage units；
LED display subroutines select the control mouth of parallel interface chip and write control word to parallel interface chip first, and R0 is referred to
To storage unit SHOWADR+1, R1 content of registers values are set as 01H as position control code, after the C mouths for selecting parallel interface chip
By C mouthfuls of carry-out bit control codes, ' a position ' light-emitting diode display is lighted；The B mouths of parallel interface chip are selected, by LED display segment code headings
Location TAB is put into data pointer DPTR, and R0 is directed toward content is stored in as pointer offset amount in A-register, by pointer DPTR+A
It is directed toward content taking-up and is put into A-register, then A-register content is the position control code of light-emitting diode display, by A-register content by B mouthfuls
Output, then LED ' a position ' displays are just by ' a position ' the information output of SHOWADR1 deposits；R0 is directed toward next storage unit, will
R1 content of registers moves to left one and a period of time is lighted in the waiting that is delayed, and parallel interface chip is selected if not recycling 2 times
C mouths after C mouthfuls of carry-out bit control codes are subjected to a partial circulating again, light light-emitting diode display ' ten ', if cycle-index arrives
R0 is then directed toward storage unit SHOWADR+1 2 times, R1 content of registers values are set as 01H as position control code, carry out one greatly
Cycle；It constantly recycles in this way, it is possible to light ' a position ', ' ten ' two light-emitting diode displays cycles.
As a preferred embodiment, of the present invention be rotated by 360 ° using stepper motor acquires 20 magnetic signals, i.e., every turn
Magnetic signal of dynamic 18 degree of acquisitions.
As another preferred embodiment, the value in the A of the present invention by register is defeated by the P1 mouths being connect with stepper motor
Go out, then stepper motor just has rotated a step, that is, has rotated 18 degree.
As another preferred embodiment, it is of the present invention it is such cycle 4 times, stepper motor i.e. have rotated 72 degree, sensor
Also 4 data deposit memory blocks are acquired, R0 content of registers is set as 00H again rotates initial value as stepper motor, then
Secondary systemic circulation 5 times, such microcontroller have rotated 360 degree, and sensor will also rotate the data deposit ADTURN that measures for 20 times and be
In the memory block of first address.
As another preferred embodiment, parallel interface chip of the present invention uses 8255 chips.
As another preferred embodiment, microcontroller of the present invention uses 80C51 chips.
As another preferred embodiment, permanent magnet, permanent magnet and section side are installed on stepping motor rotating shaft of the present invention
To parallel, all vertical components across the section magnetic line of force are cancelled out each other, and only there are horizontal component, and direction is identical.
As another preferred embodiment, stepper motor of the present invention uses 6 wire type connections.
Secondly, it is of the present invention to perform interrupt service routine, interrupt service routine when 11 feet of 80C51 chips are ' 0 '
Interruption is opened after protecting ' program scene ' and ' breakpoint ' first, performs original value acquisition subprogram, the Central Shanxi Plain is broken after execution subroutine, so
Restore ' program scene ' and ' breakpoint ' afterwards, continue to execute main program；
Start IN0 channels and carry out a period of time to be collected such as A/D conversions, delay, it is single that transformed value is put into LINEADR storages
In member.
In addition, sensor of the present invention uses 49E type Hall sensors, sensor measurement direction is X-direction.
Advantageous effect of the present invention.
Magnetic memory signal is in its normal component H p (y) zero crossing of stress concentration position, tangential component H p (x)
There is maximum value；Since normal component H p (y) are zero, tangential component H p (x) have maximum value, so
As long as determine the direction in the direction, i.e. principal stress magnetic memory signal value of H p (x) maximum values on section, you can determine principal stress
Direction.
Inventor is had found by many experiments：Principal stress magnetic memory signal can be changed when adding external magnetic field to metal material
Value, but the then value of principal stress magnetic memory signal when external magnetic field magnetic line of force direction is vertical with principal stress magnetic memory signal direction
It is constant.The present invention is based on this feature, the size conduct of principal stress magnetic memory signal X-component when measuring no external magnetic field first
' original value ' etc. is to be compared；Permanent magnet is parallel to section to put, its magnetic line of force is made to be parallel to section and direction consistent, due to adding
External magnetic field, the size of principal stress magnetic memory signal X-component can all change；It is parallel to and cut with stepper motor driving permanent magnet
Face rotates one week, records the size of every turn of principal stress magnetic memory signal X-component when moving a step, by itself and ' original value ' comparison, when
It is perpendicular to the direction of principal stress magnetic memory signal then to illustrate the rotation direction when measured value is identical with ' original value ', and then is obtained
Principal stress magnetic memory signal direction, i.e. principal direction of stress.
The present invention solves the problems, such as that metal principal direction of stress is difficult to detect.
The present invention using the externally-applied magnetic field magnetic line of force vertically tangential principal stress magnetic memory signal direction when, tangential principal stress magnetic note
Recall the constant property of restricting the number value to measure, judgement effect more intuitive and convenient.
The present invention is controlled using microcontroller, and assembler language programming makes measuring apparatus more compact, is easy to field work.
Description of the drawings
The present invention will be further described with reference to the accompanying drawings and detailed description.The scope of the present invention not only limits to
In the statement of the following contents.
Fig. 1：System calls main program flow chart.
Fig. 2：Stepper motor data acquisition routines flow chart.
Fig. 3：Gathered data handles subroutine flow chart.
Fig. 4：Binary-coded decimal conversion routine flow chart.
Fig. 5：LED display subroutine flow charts.
Fig. 6：It interrupts（Original value acquires）Subroutine flow chart.
Fig. 7：The novel stress oriented detection system construction drawing of the present invention.
Fig. 8：Metal section direction value figure.
Fig. 9：Additional permanent magnet magnetic line chart.
Figure 10：Stepper motor and permanent magnet connection figure.
Figure 11：Principle of stepping motor figure.
Figure 12：Stepper motor single-chip connection circuit diagram.
Figure 13：Hall sensor structure chart.
Figure 14：Data collecting system circuit diagram.
Figure 15：Reset system and interrupt control circuit figure.
Figure 16：Memory expansion circuit figure.
Figure 17：8255 connect circuit diagram with 80C51.
Figure 18：8255 connect circuit diagram with light-emitting diode display.
Specific embodiment
As shown in the figure, present invention can apply to novel stress oriented detection system, novel stress oriented detection system
Including microcontroller, stepper motor part of data acquisition, sensor, A/D converter, memory expansion part, reset interrupt control
Part and numerical value display portion, motor data input port and the stepper motor part of data acquisition of structural feature microcontroller
Motor data output port is connected,
The detection signal output port of sensor is connected with the detection signal input port of A/D converter, the detection of A/D converter
Signal output port is connected with the detection signal input port of microcontroller, the reset signal input port and reset interrupt of microcontroller
The reset signal output port of the reset control part of control section is connected, and the interrupt signal input port of microcontroller is with resetting
The interrupt signal output port for interrupting the interruption part processed of control section is connected, storage signal output port and the storage of microcontroller
The storage signal input port of device expansion is connected, the display signal output port of microcontroller and the display of numerical value display portion
Signal input port is connected；
The program of microcontroller include system call main program, stepper motor data acquisition routines, gathered data processing subprogram,
Binary-coded decimal conversion routine, LED display subroutines and the original value as interrupt service routine acquire subprogram；
It is raw value storage address that system, which calls main Cheng Caiyong assembler directive commands setting LINEADR,；ADTURN is gathered data
Storage area first address；SHOWADR is Data Position record value storage address, and SHOWADR1 is LED display datas ' ten ' storage
Address, SHOWADR2 are LED display datas ' a position ' storage address, and TAB is LED display segment code headings address, and TABLE is step
Stepper motor rotates forward heading address；
As shown in Figure 1, system calls main Cheng Shouxian to call stepper motor data acquisition routines, stepper motor rotation angle is utilized
Multiple magnetic signal is acquired, i.e. magnetic signal of the certain degree acquisition of often rotation, and it is first address that gathered data is put into ADTURN
In data storage area；Then gathered data processing subprogram is called to distinguish ADTURN for numerical value in the data storage area of first address
It is interrupted with passing through（Original value acquires）The collected original value of subprogram is compared, and finds out the storage list identical with original value
Member, and be stored in cycle-index as Data Position record value in SHOWADR storage units, it waits to be called；Call " binary-coded decimal turn
Change subprogram " binary code in SHOWADR storage units is converted into binary-coded decimal, and will be ' ten ' be stored in respectively with ' a position '
SHOWADR1, SHOWADR2 storage unit are medium to be called；Finally call " LED display subroutines " by SHOWADR1,
SHOWADR2 storage units storage numerical value is shown in light-emitting diode display；
Refer to as shown in Fig. 2, stepper motor rotating forward heading address TABLE is put into data by stepper motor data acquisition routines first
In needle DPTR, R0 content of registers is set as 00H and rotates initial value as stepper motor, R0 content of registers is put into A deposits
Pointer DPTR+A wherein as pointer offset amount, is directed toward content taking-up and is put into A-register, as stepper motor rotation first by device
Output valve needed for step is exported the value in register A by the port being connect with stepper motor, then stepper motor just has rotated one
Step, that is, have rotated certain angle, R0 then be directed toward next storage unit；R1 is directed toward gathered data storage area first address
ADTURN, starts IN0 channels and carries out a period of time to be collected such as A/D conversions, delay, and transformed number is put into R1 is directed toward
Area, R1 are directed toward next storage unit；Cycle is multiple in this way, and stepper motor has rotated certain angle, and sensor also acquires more
Secondary data are stored in memory block, and R0 content of registers is set as 00H again rotates initial value as stepper motor, and systemic circulation is more again
Secondary, such microcontroller has rotated certain degree, and the data deposit ADTURN that sensor also repeatedly measures rotation is first address
In memory block；
Since ADTURN can be determined for the offset of gathered data in the memory block of first address by cycle-index when searching, institute
With the LINEADR cell values that will be acquired before（Original value）It is the value recycle ratio pair in the memory block of first address with ADTURN, sends out
Existing identical value jumps out cycle, and cycle-index is medium as ' Data Position record value ' deposit SHOWADR storage units
It is to be called.As shown in figure 3, that R0 content of registers is set as 00H first is initial as cycle count for gathered data processing subprogram
R1 is directed toward data acquisition memory block first address ADTURN, R0 content of registers is added one, that is, sets rotation first step data bit by value
It is ' 1 ' to put record value, by R1 directions value compared with the acquired original value i.e. LINEADR storage unit values measured in advance, is differed
It is continued cycling through after R0, R1 content of registers then are added one respectively, it is identical then using R0 content of registers as Data Position record value
It is stored in SHOWADR storage units；
As shown in figure 4, binary-coded decimal conversion routine is put into first by SHOWADR memory cell contents divided by 10, and by result
In SHOWADR1 storage units, remainder is put into SHOWADR2 storage units, thus by two in SHOWADR storage units
Binary value is converted to binary-coded decimal, and will be ' ten ' it is put into SHOWADR1 storage units, it is single that ' a position ' is put into SHOWADR2 storages
In member；
As shown in figure 5, LED display subroutines select the control mouth of parallel interface chip and control are write to parallel interface chip first
R0 is directed toward storage unit SHOWADR+1 by word, and R1 content of registers values are set as 01H as position control code, select parallel interface core
By C mouthfuls of carry-out bit control codes after the C mouths of piece, ' a position ' light-emitting diode display is lighted；The B mouths of parallel interface chip are selected, LED is shown
Segment encode heading address TAB is put into data pointer DPTR, and R0 is directed toward content is stored in as pointer offset amount in A-register, will
Pointer DPTR+A is directed toward content taking-up and is put into A-register, then A-register content is the position control code of light-emitting diode display, and A is deposited
Device content is by B mouthfuls of outputs, then LED ' a position ' displays are just by ' a position ' the information output of SHOWADR1 deposits；R0 is directed toward next
R1 content of registers is moved to left one and a period of time is lighted in the waiting that is delayed, selected simultaneously if not recycling 2 times by storage unit
C mouthfuls of carry-out bit control codes are subjected to a partial circulating again after the C mouths of line interface chip, light light-emitting diode display ' ten ', if
R0 is then directed toward storage unit SHOWADR+1 by cycle-index to 2 times, and R1 content of registers values are set as 01H as position control code,
Carry out a systemic circulation；It constantly recycles in this way, it is possible to ' a position ', ' ten ' two light-emitting diode displays cycles are lighted, and due to
Speed and the visual difference of the mankind are lighted, is lighted when just feeling as；
The present invention shown ' Data Position record value ' by light-emitting diode display as a result, stepper motor one of the invention
Socialize and transfer 20 steps, select two light-emitting diode displays respectively as ' ten ' and ' a position '.First with ' except digit remainder
Number ' method ' Data Position record value ' in SHOWADR storage units is converted into binary-coded decimal by binary number, and will be ' ten '
It is put into SHOWADR+2 storage units, ' a position ' is put into SHOWADR+1 storage units；It is connect parallel using microcontroller control
8255 cycle of mouth is lighted and exports the value in SHOWADR+2, SHOWADR+1 storage unit；It thus can be by ' Data Position is remembered
Record value ' it is shown by light-emitting diode display.
The original value is acquired by reset interrupt control section.
It is described to be rotated by 360 ° 20 magnetic signals of acquisition using stepper motor, i.e., often rotate magnetic signal of 18 degree of acquisitions.
Value in the A by register is exported by the P1 mouths being connect with stepper motor, then stepper motor just has rotated a step,
Have rotated 18 degree.
Such cycle 4 times, stepper motor has rotated 72 degree, and sensor also acquires 4 data deposit memory blocks,
R0 content of registers is set as 00H again and rotates initial value, again systemic circulation 5 times as stepper motor, such microcontroller revolves
360 degree are turned, it is in the memory block of first address that sensor, which will also rotate 20 data deposit ADTURN measured,.
The parallel interface chip uses 8255 chips.
The microcontroller uses 80C51 chips.
As shown in figure 12, the stepper motor part of data acquisition use LUN2003 chips, the 1C of LUN2003 chips,
2C, 3C, 4C pin are connected respectively the orange of 20BY20H01 type stepper motors, brown, yellow, black pin, LUN2003
Tetra- pins of 1B, 2B, 3B, 4B of chip are connected respectively tetra- pins of P1.0, P1.1, P1.2, P1.3 of 80C51 chips,
Thus 80C51 microcontrollers just carry out stepper motor rotation control using P1 mouthfuls, and wherein LUN2003 plays the work of amplification electric current
With.
As shown in figure 9, permanent magnet, permanent magnet and section are installed on the stepping motor rotating shaft（If metal covering is plane,
The section is metal flat；If metal covering is arcwall face, which is the section of arcwall face）Direction is parallel, and all pass through is cut
The vertical component of the face magnetic line of force is cancelled out each other, and only there are horizontal component, and direction is identical, ensure that the magnetic force of externally-applied magnetic field
Line requirement parallel with section, in the same direction.The magnetic signal value of metallic test point X-direction is measured first with sensor, then in stepping
The permanent magnet parallel with section is put on motor, permanent magnet is made to be parallel to section using stepper motor and rotated；Such as Fig. 9, due to forever
Magnet is parallel with section direction, so all vertical components across the section magnetic line of force are cancelled out each other, only there are horizontal component, and
Direction is identical；It thereby realizes the externally-applied magnetic field magnetic line of force and is parallel to 360 degree of section rotation.Stepping is controlled using microcontroller
Motor rotate, and every turn move a step by corresponding magnetic signal value be put into ADTURN be first address gathered data storage area in.
The present invention can drive permanent magnet using stepper motor, while rotate and add gathered data, make magnetic signal size and corresponding rotational angle
It is corresponding, comparison is facilitated to record.
The stepper motor uses 6 wire type connections；Torque bigger disclosure satisfy that the demand of driving permanent magnet.
As shown in Figure 17,18, the numerical value display portion includes 8255 chips, eight road reverse drivens, two-way and reversely drives
Dynamic device and two light-emitting diode displays, the P0 mouths of 80C51 chips are connected with the data port of 8255 chips, the transmission of data are carried out, by P0
Mouth is connected to by a decoding circuit in the CS chip select pins of 8255 chips with P2 mouthfuls, the selection of chip is carried out, by ' reading '
' writing ' pin, which corresponds to, to be connected；The PB mouths of 8255 chips pass through the eight road reverse drivens section control mouth with two light-emitting diode displays respectively
It is connected, the PC0 mouths of 8255 chips pass through two-way reverse driven and ' the position control mouth of a position ' light-emitting diode display is connected, 8255 chips
PC1 mouths control mouth by two-way reverse driven and ' ten ' position of light-emitting diode display and be connected.
As shown in figure 15, the interruption control section of the reset interrupt control section includes switch K2, switch K2 one end
Be connected respectively with capacitance C2 one end, power supply VGG, the switch K2 other ends respectively with the capacitance C2 other ends, resistance R2 one end, first non-
Door input terminal is connected, and resistance R2 other ends ground connection, the first non-gate output terminal is connected with 11 feet of 80C51 chips.When switch is pressed
Start interrupt service routine, and then start original value acquisition subprogram.
Shown capacitance C2 uses 10uF capacitances, and resistance R2 uses 10K Ohmic resistances.
Since test value must be with test point X-axis magnetic signal value during no externally-applied magnetic field（Original value）It is compared, so must
It must acquire in advance ' original value ', the present invention is acquired ' original value ' using the mode of additional interruption；Utilized in no externally-applied magnetic field
Microcontroller INT0 pins generate interruption, perform interruption subroutine, and interruption subroutine is by test point X during collected no externally-applied magnetic field
Axis magnetic signal value（Original value）It is medium to be called to be stored in LINEADR storage units.It is pressed when K2 is switched, the 11 of 80C51 chips
Foot is ' 0 ', performs interrupt service routine, as shown in fig. 6, interrupt service routine is opened after protecting ' program scene ' and ' breakpoint ' first
It interrupts, performs original value acquisition subprogram, the Central Shanxi Plain is broken after execution subroutine, is then restored ' program scene ' and ' breakpoint ', is continued
Perform main program；
Start IN0 channels and carry out a period of time to be collected such as A/D conversions, delay, it is single that transformed value is put into LINEADR storages
In member.
As shown in figure 13, the sensor uses 49E type Hall sensors, and sensor measurement direction is X-direction.Pass through
Many experiments are found, can change the value of principal stress magnetic memory signal, but work as external magnetic field when adding external magnetic field to metal material
Then the value of principal stress magnetic memory signal is constant when magnetic line of force direction is vertical with principal stress magnetic memory signal direction.The present invention is based on this
A feature, X-axis magnetic signal size when first measuring test point without externally-applied magnetic field（Such as Fig. 8, if section is horizontal, y direction is respectively X
Axis, Y-axis；If the vertical direction of section is Z axis --- the direction that general magnetic signal measures is chosen, X-axis magnetic signal size and principal stress
Magnetic signal size is directly proportional）It is to be compared as ' original value ' etc.；Externally-applied magnetic field again, and the externally-applied magnetic field magnetic line of force is made to be parallel to section
It is rotated by 360 °, every time rotation observation X-axis magnetic signal size variation situation, when X-axis magnetic signal size is identical with ' original value ',
Then illustrate that the direction is vertical for principal stress magnetic memory signal direction, measure ' Data Position record value ', it will ' Data Position record
Value ' with stepper motor often walk number of rotation（18 degree）It is multiplied, comparison motor rotation initial position, it is possible to show that principal stress magnetic is remembered
Recall signal vertical direction, and then find principal stress magnetic memory signal direction, as principal direction of stress.
As shown in figure 16, the memory expansion part includes 74LS373 chips and HM628128RAM chips, 80C51 cores
32~39 feet of piece respectively it is corresponding with 18,17,14,13,8,7,4,3 foot of the chip of 74LS373 be connected, 80C51 chips 32~
39 feet are corresponding with 21~13 feet of HM628128RAM chips respectively to be connected, the chip 19,16,15,12,9,6,5,2 of 74LS373
Foot is corresponding with 5~12 feet of HM628128RAM chips respectively to be connected, 17,18 feet of 80C51 chips respectively with HM628128RAM
24, the 29 of chip, which correspond to, to be connected；
1,2 feet of 80C51 chips are corresponding with 2,31 feet of HM628128RAM chips respectively to be connected, 27~21 points of 80C51 chips
It is not corresponding with 3,28,4,25,23,26,27 feet of HM628128RAM chips to be connected；22 feet of HM628128RAM chips and decoding
Circuit is connected；30 feet of 80C51 chips are connected with 11 feet of 74LS373 chips.
Setting memory expansion part can meet the needs of mass data processing.
As shown in figure 14, the A/D converter uses AD0809 chips, the P of 80C51 chips0Port and AD0809 chips
Data access port D ports be connected, the A of 74LS373 chips0、A1、A2Port is right with A, B of AD0809 chips, C-terminal mouth respectively
It should be connected；
13 feet of 80C51 chips are connected with the second non-gate output terminal, the EOC ports phase of the second NOT gate input terminal and AD0809 chips
Even, 16 feet of 80C51 chips are connected with first with the first input end of door, 21 feet of 0C51 chips respectively with first and door the
Two input terminals, second are connected with the first input end of door, and 17 feet of 80C51 chips are connected with second with the second input terminal of door；
First is connected with the output terminal of door with third NOT gate input terminal, the non-gate output terminal of third respectively with the ST ends of AD0809 chips
Mouth, ALE ports are connected；Second is connected with the output terminal of door with the 4th NOT gate input terminal, the 4th non-gate output terminal and AD0809 cores
The OE ports of piece are connected；30 feet of 80C51 chips are by taking half value circuit to be connected with the CLK ports of AD0809 chips；
The IN0 mouths of AD0809 chips are connected for C mouthfuls as signal access port with Hall sensor, and A mouthfuls of Hall sensor connects power supply, suddenly
You are grounded B mouthfuls of sensor.
As shown in figure 15, the reset control part of the reset interrupt control section includes switch K1, switch K1 one end point
Be not connected with power supply VCC, capacitance C1 one end, the switch K1 other ends respectively with the capacitance C1 other ends, resistance R1 one end, 80C51 cores
9 feet of piece are connected, resistance R1 other end ground connection.
Shown capacitance C1 uses 10uF capacitances, and resistance R1 uses 10K Ohmic resistances.
When test is completed or when something goes wrong, a reset system is needed to carry out counting of reworking；It is existing according to the present invention
The demand of field work uses the form design of outside connected switch to reset system.
It is understood that above with respect to the specific descriptions of the present invention, it is merely to illustrate the present invention and is not limited to this
The described technical solution of inventive embodiments, it will be understood by those of ordinary skill in the art that, still the present invention can be carried out
Modification or equivalent replacement, to reach identical technique effect；As long as meeting using needs, all protection scope of the present invention it
It is interior.
Claims (10)
1. a kind of principal direction of stress determination method based on magnetic memory detection technology calls main program, stepper motor including system
Data acquisition routines, gathered data handle subprogram, binary-coded decimal conversion routine, LED display subroutines and are serviced as interrupting
The original value acquisition subprogram of program；It is characterized in that：
It is raw value storage address that system, which calls main Cheng Caiyong assembler directive commands setting LINEADR,；ADTURN is gathered data
Storage area first address；SHOWADR is Data Position record value storage address, and SHOWADR1 is LED display datas ' ten ' storage
Address, SHOWADR2 are LED display datas ' a position ' storage address, and TAB is LED display segment code headings address, and TABLE is step
Stepper motor rotates forward heading address；
System calls main Cheng Shouxian to call stepper motor data acquisition routines, and multiple magnetic is acquired using stepper motor rotation angle
Signal, i.e. magnetic signal of the certain degree acquisition of often rotation, and gathered data is put into the data storage area that ADTURN is first address
In；Then gathered data processing subprogram is called to interrupt ADTURN with passing through respectively for numerical value in the data storage area of first address
（Original value acquires）The collected original value of subprogram is compared, and finds out the storage unit identical with original value, and will cycle
Number is stored in as Data Position record value in SHOWADR storage units, is waited to be called；Call " binary-coded decimal conversion routine " will
Binary code is converted to binary-coded decimal in SHOWADR storage units, and will be ' ten ' be stored in respectively with ' a position ' SHOWADR1,
SHOWADR2 storage units are medium to be called；" LED display subroutines " is finally called to store SHOWADR1, SHOWADR2 single
Member storage numerical value is shown in light-emitting diode display；
Stepper motor rotating forward heading address TABLE is put into data pointer DPTR by stepper motor data acquisition routines first,
Using R0 content of registers be set as 00H as stepper motor rotate initial value, using R0 content of registers be put into A-register wherein as
Pointer DPTR+A is directed toward content taking-up and is put into A-register, as exported needed for the stepper motor rotation first step by pointer offset amount
Value is exported the value in register A by the port being connect with stepper motor, then stepper motor just has rotated a step, that is, has rotated
Then R0 is directed toward next storage unit by certain angle；R1 is directed toward gathered data storage area first address ADTURN, starts IN0
Channel carries out a period of time to be collected such as A/D conversions, delay, and transformed number is put into R1 is directed toward area, and R1 is directed toward next deposit
Storage unit；Cycle is multiple in this way, and stepper motor has rotated certain angle, and sensor also acquires multiple data deposit storage
R0 content of registers is set as 00H and rotates initial value as stepper motor by area again, and systemic circulation is multiple again, such microcontroller
Certain degree is had rotated, sensor will also rotate the data deposit ADTURN repeatedly measured as in the memory block of first address；
R0 content of registers is set as 00H as cycle count initial value by gathered data processing subprogram first, and R1 is directed toward number
According to acquisition memory block first address ADTURN, R0 content of registers is added one, that is, set rotation first step Data Position record value as
' 1 ', it by R1 directions value compared with the acquired original value i.e. LINEADR storage unit values measured in advance, differs, R0, R1 is posted
Storage content continues cycling through after adding one respectively, identical to be then stored in SHOWADR using R0 content of registers as Data Position record value
In storage unit；
Result is put into SHOWADR1 storage lists by binary-coded decimal conversion routine first by SHOWADR memory cell contents divided by 10
In member, remainder is put into SHOWADR2 storage units, is thus converted to the binary numeral in SHOWADR storage units
Binary-coded decimal, and will be ' ten ' be put into SHOWADR1 storage units, ' a position ' is put into SHOWADR2 storage units；
LED display subroutines select the control mouth of parallel interface chip and write control word to parallel interface chip first, and R0 is referred to
To storage unit SHOWADR+1, R1 content of registers values are set as 01H as position control code, after the C mouths for selecting parallel interface chip
By C mouthfuls of carry-out bit control codes, ' a position ' light-emitting diode display is lighted；The B mouths of parallel interface chip are selected, by LED display segment code headings
Location TAB is put into data pointer DPTR, and R0 is directed toward content is stored in as pointer offset amount in A-register, by pointer DPTR+A
It is directed toward content taking-up and is put into A-register, then A-register content is the position control code of light-emitting diode display, by A-register content by B mouthfuls
Output, then LED ' a position ' displays are just by ' a position ' the information output of SHOWADR1 deposits；R0 is directed toward next storage unit, will
R1 content of registers moves to left one and a period of time is lighted in the waiting that is delayed, and parallel interface chip is selected if not recycling 2 times
C mouths after C mouthfuls of carry-out bit control codes are subjected to a partial circulating again, light light-emitting diode display ' ten ', if cycle-index arrives
R0 is then directed toward storage unit SHOWADR+1 2 times, R1 content of registers values are set as 01H as position control code, carry out one greatly
Cycle；It constantly recycles in this way, it is possible to light ' a position ', ' ten ' two light-emitting diode displays cycles.
2. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
It is described to be rotated by 360 ° 20 magnetic signals of acquisition using stepper motor, i.e., often rotate magnetic signal of 18 degree of acquisitions.
3. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
Value in the A by register is exported by the P1 mouths being connect with stepper motor, then stepper motor just has rotated a step, that is, has rotated
18 degree.
4. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
Such cycle 4 times, stepper motor has rotated 72 degree, and sensor also acquires 4 data deposit memory blocks, and R0 is deposited
Device content is set as 00H and rotates initial value, again systemic circulation 5 times as stepper motor again, and such microcontroller has rotated 360
Degree, it is in the memory block of first address that sensor, which will also rotate 20 data deposit ADTURN measured,.
5. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
The parallel interface chip uses 8255 chips.
6. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
The microcontroller uses 80C51 chips.
7. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
Permanent magnet is installed, permanent magnet is parallel with section direction, all to divide across the vertical of the section magnetic line of force on the stepping motor rotating shaft
Amount is cancelled out each other, and only there are horizontal component, and direction is identical.
8. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
The stepper motor uses 6 wire type connections.
9. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
11 feet when 80C51 chips perform interrupt service routine when being ' 0 ', interrupt service routine protect first ' program scene ' and
Interruption is opened after ' breakpoint ', performs original value acquisition subprogram, the Central Shanxi Plain is broken after execution subroutine, then recovery ' program scene ' and
' breakpoint ', continues to execute main program；
Start IN0 channels and carry out a period of time to be collected such as A/D conversions, delay, it is single that transformed value is put into LINEADR storages
In member.
10. a kind of principal direction of stress determination method based on magnetic memory detection technology according to claim 1, it is characterised in that
The sensor uses 49E type Hall sensors, and sensor measurement direction is X-direction.
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