A kind of calibration method of the positioner slow-speed of revolutionTechnical field
The invention belongs to metering instrument and the field of test technology, in particular to a kind of calibration side of the positioner slow-speed of revolutionMethod.
Background technique
Welding is one of most important technology in manufacturing industry, it is in machine-building, nuclear industry, aerospace, the energyIn the industries such as traffic, petrochemical industry and building and electronics using more and more extensive.And positioner, sometimes also referred to as weldSwitch through platform, also just becomes a kind of indispensable equipment of large-scale workpiece welding procedure.
Positioner, which mainly passes through the movements such as the positive and negative revolution, overturning, lifting of workbench, makes workpiece be in best welderingPosition is connect, it changes the welding operation that vertical position welding, overhead welding, annular welds etc. may be needed to be difficult to ensure welding quality, to guaranteeWelding quality, improves the safety of welding productivity and production process.
Positioner is under conditions of meeting rated load, rotational speed (i.e. the revolving speed of workbench) parameter of workbenchBe positioner it is main be also most important parameter.Calibration or measurement to the parameter, since it is more special, workRange is generally in 0.01r/min~20r/min.For being greater than or equal to the revolving speed of 1r/min, we can pass through digital lightElectric revolution counter is directly measured in welding scene, and it is simply easily operated to change method.Due to being limited to digital photoelectric whirl tableMeasurement range, for the slow-speed of revolution less than 1r/min, we then can not directly be measured by revolution counter.Due to positionerThere is no lock-out pulse output, and to be measured by other methods, it is just much greater in the difficulty of welding scene measurement, it canOperability is not also strong.
It is known that the unit of revolving speed is rev/min, refers in the unit time, the number that object moves in a circle, and weldDisplacement machine worktable is exactly a kind of circular motion at the uniform velocity.In actual operation, workpiece fixation to be welded only needs on the tableIt rotates a circle with regard to achievable welding.So we can measure one week elapsed time of positioner worktable rotary come it is quasi-The really revolving speed of measurement workbench.
Summary of the invention
In order to achieve the above objectives, the present invention provides a kind of calibration methods of positioner slow-speed of revolution, including walk as followsIt is rapid:
Step 1: a reflective sticker is sticked in the appropriate location on welding turntable, and photoelectric sensor is arranged and makesOn its light vertical irradiation to reflective sticker issued, the input terminal of the output end linkage counter of the photoelectric sensor；
Step 2: welding turntable is rotated with initial velocity；
Step 3: photoelectric sensor receives the first reflection optical signal of reflective paster, transmits after being converted into electric signalTo counter, as initial signal；
Step 4: photoelectric sensor receives second of reflected light signal of reflective paster, transmits after being converted into electric signalTo counter, as stop signal；
Step 5: counter measures interval time according to initial signal and stop signal；
Step 6: welding turntable tachometer value is calculated according to the interval time of step 5.
Further, after the signal of photoelectric sensor being drawn by connecting line, the defeated of counter is connected to using BNC connectorEnter end.
Further, before step 1, according to photoelectric sensor export electric signal characteristic to counter whenBetween interval measurement function be configured.
Further, in step 6, the circular of tachometer value: n=60/T, wherein n be revolving speed, unit be turn/Point；T is interval time, and unit is the second.
The invention has the following advantages:
1. the output signal of photoelectric sensor is drawn by connecting line, becoming it from special equipment can be withThe matching used common apparatus of other equipment.
2. direct measurement revolving speed magnitude is converted to measurement by being used cooperatively the instrument being used alone originally againTime interval magnitude improves the accuracy of measurement, especially suitable for revolving speed lower than the welding displacement that 1r/min moves with uniform velocityThe measurement of rotating speed of machine turntable.
Specific embodiment
The present invention provides a kind of calibration methods of positioner slow-speed of revolution, include the following steps:
Step 1: a reflective sticker is sticked in the appropriate location on welding turntable, and photoelectric sensor is arranged and makesOn its light vertical irradiation to reflective sticker issued, the input terminal of the output end linkage counter of the photoelectric sensor.
By the output signal of photoelectric sensor by connecting line draw, make its from special equipment become can and itsThe common apparatus that his coordinative composition of equipments uses.
Before this, time interval measurement function of the characteristic to counter of electric signal is exported according to photoelectric sensorIt is configured.Speed-frequency instrument at this time is not involved in measurement, only provides power supply to photoelectric sensor and observation photoelectricity turnsWhether fast sensor has normal signal to export, and wants so can also provide to meet to photoelectric sensor with other methodsThe power supply asked.Further, after the signal of photoelectric sensor being drawn by connecting line, counter is connected to using BNC connectorInput terminal.
Present embodiment universal counter SP53131A, time interval measurement range is very big, and accuracy can reach 1 ×10-7 magnitude is even higher.
Step 2: welding turntable is rotated with initial velocity.
Initial speed is to be set according to reality by operator oneself.
Step 3: photoelectric sensor receives the first reflection optical signal of reflective paster, transmits after being converted into electric signalTo counter, as initial signal.
Step 4: photoelectric sensor receives second of reflected light signal of reflective paster, transmits after being converted into electric signalTo counter, as stop signal.
It, will be defeated when the light vertical irradiation that photoelectric sensor issues is to the reflective sticker being pasted on welding turntableThe certain positive pulse electric signal of an amplitude out, if the positioner of uniform motion rotates a circle, photoelectric whirl is passedSensor will export two positive pulse electric signals for having the amplitude of certain time interval certain.
Step 5: counter measures interval time according to initial signal and stop signal.
The time interval measurement function of universal counter SP53131A is arranged to A, the measurement of channel B conjunction state, thusThe time interval of the signal all the way of A channel input can be measured.
Step 6: welding turntable tachometer value is calculated according to the interval time of step 5.
The circular of tachometer value: n=60/T, wherein n is revolving speed, and unit is rev/min；T is interval time, unitFor the second.