CN110617758A - Precision detection machine of magnetic grid ruler and precision detection method thereof - Google Patents
Precision detection machine of magnetic grid ruler and precision detection method thereof Download PDFInfo
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- CN110617758A CN110617758A CN201910793587.9A CN201910793587A CN110617758A CN 110617758 A CN110617758 A CN 110617758A CN 201910793587 A CN201910793587 A CN 201910793587A CN 110617758 A CN110617758 A CN 110617758A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/042—Calibration or calibration artifacts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Abstract
The application discloses precision detection machine of magnetic grid chi and precision detection method thereof, the magnetic grid chi has a plurality of equidistant magnetic poles, the magnetic pole includes first magnetic pole and second magnetic pole, precision detection machine is including being used for detecting the magnetic pole of magnetic grid chi and send feedback signal's reading head, control the reading head is in the controlling means of last motion of magnetic grid chi, and through the feedback signal detection of reading head the high accuracy linear module of actual distance between first magnetic pole and the second magnetic pole. The measuring accuracy of the magnetic grid ruler can be detected.
Description
Technical Field
The application relates to the technical field of display, in particular to a precision detection machine of a magnetic grid ruler and a precision detection method thereof.
Background
The magnetic grid ruler is a device for detecting displacement by utilizing electromagnetic characteristics and a magnetic recording principle and is generally divided into a ruler magnetic grid, a magnetic grid reading head and a detection circuit. On the magnetic grid ruler, square wave or sine wave signals with certain wavelength recorded by magnetized magnetic poles are used. During detection, the magnetic grid reading head reads a square wave or sine wave electromagnetic signal on the magnetic grid ruler, converts the square wave or sine wave electromagnetic signal into an electric signal, and realizes displacement detection according to the electric signal.
However, the accuracy of the conventional magnetic scale cannot meet the factory requirement or the use requirement, and the error is enlarged by using the unqualified magnetic scale for measurement, so that how to detect the measurement accuracy of the magnetic scale becomes a technical problem to be solved by the technical staff in the field.
Disclosure of Invention
The application aims to provide a precision detection machine of a magnetic grid ruler and a precision detection method thereof, so as to detect the measurement precision of the magnetic grid ruler.
The application discloses a precision detector of a magnetic grid ruler, wherein the magnetic grid ruler is provided with a plurality of magnetic poles at equal intervals, the magnetic poles comprise a first magnetic pole and a second magnetic pole, and the precision detector comprises a reading head used for detecting the magnetic poles of the magnetic grid ruler and sending a feedback signal; the control device controls the reading head to move on the magnetic grid ruler; and a high-precision linear module for detecting the actual distance between the first magnetic pole and the second magnetic pole through a feedback signal of the reading head.
Optionally, the theoretical distance between the first magnetic pole and the second magnetic pole is a marked distance, the precision detector further includes a marked distance obtaining module and an error calculating module, the marked distance obtaining module obtains the marked distance, the error calculating module is respectively connected with the marked distance obtaining module and the high-precision linear module to obtain and compare the marked distance and the actual distance, and if the difference value is smaller than a preset threshold value, the magnetic grating ruler is qualified; and if the difference value is greater than or equal to the preset threshold value, the magnetic grid ruler is unqualified.
Optionally, the control device includes a slider, the slider is in sliding fit with the magnetic scale in the direction in which the magnetic scale extends, and the reading head is disposed on the slider;
the control device also comprises a programmable logic controller, a servo driver, a servo motor and a linear screw rod, wherein the editable logic controller comprises a high-speed pulse output port, and the servo driver is connected with the editable logic controller through the high-speed pulse output port; the editable logic controller outputs a high-speed pulse string to the servo driver, the servo driver controls the servo motor to work according to the high-speed pulse string, and the servo motor controls the sliding block to move through the linear screw rod.
Optionally, the precision detection machine further includes a human-computer interaction controller, the programmable logic controller includes a communication port, and the human-computer interaction controller is connected to the programmable logic controller through the communication port to implement communication.
Optionally, the high-precision linear module includes a displacement sensor, and the displacement sensor is disposed in cooperation with the reading head and configured to calculate an actual distance between the first magnetic pole and the second magnetic pole according to feedback information corresponding to the first magnetic pole and the second magnetic pole, the feedback information being fed back by the reading head.
Optionally, the precision detector comprises a detection machine table, a material tray arranged in parallel with the high-precision linear module is arranged on a table surface of the detection machine table, and the magnetic grid ruler is detachably mounted at the material tray; the detection machine is provided with an origin signal inductor, the origin signal inductor is matched with the material tray and used for indicating the zero return position of the reading head, and the origin signal inductor is coupled with an origin signal induction port of the programmable logic controller.
Optionally, the high-precision linear module includes a housing, the displacement sensor includes a high-precision grating scale, and the high-precision grating scale is disposed in the housing; the control device is integrated on or in the housing.
Optionally, the precision detector further includes a data display, and the data display is coupled to the reading head and the high-precision linear module to display the numerical value of the actual distance.
The application also discloses a precision detection method of the magnetic grid ruler, which is applied to any precision detector disclosed by the application and comprises the following steps:
initializing the system and completing zero return;
controlling the displacement of the reading head to detect the actual distance between the first magnetic pole and the second magnetic pole of the magnetic grid ruler;
the actual distance is displayed.
Optionally, the step of displaying the actual distance includes:
acquiring a marked distance and an actual distance, and calculating a difference value between the marked distance and the actual distance;
comparing the difference value with a preset threshold value, and judging whether the precision of the magnetic grid ruler is qualified or not according to the comparison result to obtain a judgment result;
and displaying the actual distance, the difference value, the comparison result and the judgment result.
The reading head moves under the control of the control device, the reading head is used for detecting magnetic poles in the magnetic grid ruler and sending a feedback signal, the reading head detects the selected first magnetic pole and the selected second magnetic pole and generates a corresponding feedback signal to the high-precision linear module, therefore, the actual distance between the first magnetic pole and the second magnetic pole can be detected, and the actual measurement precision of the magnetic grid ruler is measured by comparing the actual distance with the marked distance of the first magnetic pole and the second magnetic pole as the actual distance precision obtained by measurement is far higher than that of the magnetic grid ruler; the first magnetic pole and the second magnetic pole can be any two magnetic poles in the magnetic grid ruler, and can also be a magnetic pole positioned at the origin and a magnetic pole positioned at the terminal in the magnetic grid ruler.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view of an accuracy testing machine of an embodiment of the present application;
FIG. 2 is a schematic diagram of the overall structure of the precision detector according to an embodiment of the present application;
FIG. 3 is a top view of the precision measuring machine according to an embodiment of the present application;
FIG. 4 is an exploded view of the structure of the precision detection machine of an embodiment of the present application;
FIG. 5 is an overall schematic view of an accuracy testing machine of an embodiment of the present application;
FIG. 6 is a first flowchart of a method of accuracy detection according to an embodiment of the present application;
FIG. 7 is a second flowchart of a method of accuracy detection of an embodiment of the present application;
FIG. 8 is a program flow diagram of a programmable logic controller of a method of accuracy detection according to an embodiment of the present application;
fig. 9 is a flowchart of a touch screen (human-computer interaction controller) of a precision detection method according to an embodiment of the present application.
Wherein, 1, a magnetic grid ruler; 2. a read head; 3. a control device; 4. a high precision linear module; 5. detecting a machine table; 6. a data display; 7. a human-computer interaction controller; 8. a material tray; 31. a slider; 32. a programmable logic controller; 33. a servo driver; 34. a servo motor; 35. a linear screw rod; 41. displacement sensor/high precision grating ruler; 42. a housing; 321. a high-speed pulse output port; 322. a communication port; 323. an origin signal sensor; 324. an origin signal sensing port; 331. a feedback port.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
With the increasing requirements on the precision and speed of numerical control machine tools, the adoption of linear displacement detection devices becomes more and more important, and particularly, sensors for measuring a large number of lengths are required in the fields of automatic control, machine manufacturing and industrial application. Currently, most of precision measuring instruments used in the industrial field amplify the minimum scale mechanically to obtain more accurate measurement values. For example, a vernier caliper is a caliper that uses a vernier to enlarge the minimum scale of a main scale, thereby achieving a measurement accuracy of 0.02 mm. For another example, the micrometer caliper uses a spiral ruler to enlarge the minimum scale of the main scale, i.e. the spiral ruler is used to convert the linear distance into angular displacement, thereby improving the measurement accuracy to 0.01 mm.
For the vernier caliper, only the number of the squares of the vernier caliper can be increased to improve the measurement accuracy, however, the increase of the number of the squares increases the parallax due to the difference of 1/n mm between each square of the main caliper and the vernier, which increases the difficulty of the user in identifying the vernier. For micrometer screws, the accuracy can only be improved by reducing the minimum scale of the screw, which also increases the difficulty of use. In fact, due to the limitation of the machining capability, the method of improving the measurement accuracy by mechanical amplification causes the increase of the manufacturing difficulty and cost, and is difficult to implement and not suitable for mass production.
Under such background conditions, a magnetic scale for measurement based on the principle of magnetoelectric conversion has been developed, and a component including a magnetic scale and a magnetic head is called a magnetic scale type length sensor. The system composed of the magnetic grating measuring system and electronic parts such as filtering, amplifying, shaping, subdividing, counting, digital displaying and the like has the length measuring precision of 3 micrometers/1000 millimeters and the angle measuring precision of 1'/360 degrees or even higher. The process of recording strictly equally spaced magnetic waves on a magnetic scale (or disk) by a recording head is called magnetic recording, using a method similar to the recording technique. The magnetic scale on which the magnetic wave has been recorded is called a magnetic grid scale. The separation distance between adjacent grid waves on the magnetic grid ruler is called the wavelength of the magnetic grid, and is also called the pitch (grid distance) of the magnetic grid.
However, the inventor finds that the existing magnetic grid ruler is difficult to carry out effective precision detection, so that the ex-factory magnetic grid ruler has the problem of unqualified measurement precision; or, after long-term use, the measurement accuracy of the magnetic scale may be degraded. In order to ensure that the precision of the used magnetic grid ruler can meet the precision requirement, the inventor improves the precision detector of the following magnetic grid ruler and the precision detection method thereof.
The present application is described in detail below with reference to the figures and alternative embodiments.
Fig. 1 is a schematic diagram of an accuracy testing machine according to an embodiment of the present application, and referring to fig. 1, the present application discloses an accuracy testing machine for a magnetic scale, where the magnetic scale 1 has a plurality of equally spaced magnetic poles, and the magnetic poles include a first magnetic pole and a second magnetic pole (not shown in the figure), and the accuracy testing machine includes:
the reading head 2 is used for detecting the magnetic poles of the magnetic grid ruler 1 and sending a feedback signal;
a control device 3 for controlling the movement of the reading head 2 on the magnetic scale 1;
and the high-precision linear module 4 detects the actual distance between the first magnetic pole and the second magnetic pole through a feedback signal of the reading head 2.
The reading head moves under the control of the control device, the reading head is used for detecting magnetic poles in the magnetic grid ruler and sending a feedback signal, the reading head detects the selected first magnetic pole and the selected second magnetic pole and generates a corresponding feedback signal to the high-precision linear module, therefore, the actual distance between the first magnetic pole and the second magnetic pole can be detected, and the actual measurement precision of the magnetic grid ruler is measured by comparing the actual distance with the marked distance of the first magnetic pole and the second magnetic pole as the actual distance precision obtained by measurement is far higher than that of the magnetic grid ruler; the first magnetic pole and the second magnetic pole can be any two magnetic poles in the magnetic grid ruler, and can also be a magnetic pole positioned at the origin and a magnetic pole positioned at the terminal in the magnetic grid ruler.
The precision detector further comprises a marked distance obtaining module and an error calculating module (not shown in the figure), wherein the marked distance obtaining module obtains the marked distance, the error calculating module is respectively connected with the marked distance obtaining module and the high-precision linear module 4 to obtain and compare the marked distance and the actual distance, and if the difference value is smaller than a preset threshold value, the magnetic grid ruler 1 is qualified; and if the difference value is larger than the preset threshold value, the magnetic grid ruler 1 is unqualified. The marking distance, namely the distance which is expected to be reached during the production of the magnetic grid ruler, takes the distance between adjacent magnetic poles as 5mm as an example, 201 magnetic poles are spaced by 200 magnetic poles in total, and the total marking distance is 1000 mm; in fact, magnetizing cannot be performed accurately, so that the actual distance between 200 magnetic poles deviates from 1000mm, and generally, when the deviation is less than or equal to 5 wires (one wire is equal to one hundredth of mm), the magnetic grid ruler is qualified.
FIG. 2 is a schematic diagram of the overall structure of the precision detector according to an embodiment of the present application; FIG. 3 is a top view of a precision measuring machine according to an embodiment of the present application; FIG. 4 is an exploded view of the structure of an accuracy testing machine according to another embodiment of the present application; fig. 5 is an overall schematic diagram of an accuracy testing machine according to another embodiment of the present application, and referring to fig. 2 to 5, it can be known from fig. 1 that:
the control device 3 comprises a slide block 31, the slide block 31 is matched with the magnetic grid ruler 1 in a sliding mode in the extending direction of the magnetic grid ruler 1, and the reading head 2 is arranged on the slide block 31. The moving direction of the sliding block is parallel to and close to the extending direction of the magnetic grid ruler, and the reading head faces the position of the magnetized magnetic pole of the magnetic grid ruler, so that when the difference value between the actual distance and the marked distance of a certain two magnetic poles in the magnetic grid ruler needs to be detected, the sliding block is controlled by the control device to sequentially pass through the two magnetic poles to be detected, such as the first magnetic pole and the second magnetic pole, the actual distance between the first magnetic pole and the second magnetic pole can be obtained through the matching detection of the high-precision linear module, and whether the magnetizing precision of the first magnetic pole and the second magnetic pole meets the preset requirement or not is judged.
In order to control the movement of the slider, the control device 3 specifically includes a programmable logic controller 32, a servo driver 33, a servo motor 34 and a linear screw 35, the editable logic controller 32 includes a high-speed pulse output port 321, and the servo driver 33 is connected to the editable logic controller 32 through the high-speed pulse output port 321;
the editable logic controller 32 outputs a high-speed pulse train to the servo driver 33, the servo driver 33 controls the servo motor 34 to work according to the high-speed pulse train, and the servo motor 34 controls the slide block 31 to move through the linear screw rod 35. Wherein, furthermore, the servo driver 33 can be set to a full closed-loop control, and the rotation mode of the motor is CW/CWW mode (CW, clock-wise; CCW, counter-clock-wise). In this way, through the control of a Programmable Logic Controller (PLC), a servo driver, a servo motor and a linear lead screw, the slider can slide between required positions to detect the actual distance between the first magnetic pole and the second magnetic pole to be detected; generally, the first magnetic pole is an original magnetic pole of the magnetic scale, the second magnetic pole is an end magnetic pole of the magnetic scale, and the actual distance is an actual distance of the measuring range of the magnetic scale. Specifically, the programmable logic controller may employ a loose FX-sigma motion control type PLC; wherein, the programmable logic controller can also be replaced by a Micro Controller Unit (MCU).
In order to be better suitable for the precision measurement of different magnetic grid scales, the precision detection machine further comprises a human-computer interaction controller 7, the programmable logic controller 32 comprises a communication port 322, and the human-computer interaction controller 7 is connected with the programmable logic controller 32 through the communication port 322 to realize communication. The human-computer interaction controller 7 may include a touch screen, or may be a control method such as a key to set a parameter that can be set by the programmable logic controller 32.
Optionally, the high-precision linear module 4 includes a displacement sensor 41, and the displacement sensor 41 is disposed in cooperation with the reading head 2, and is configured to calculate an actual distance between the first magnetic pole and the second magnetic pole according to feedback information of the reading head 2 corresponding to the first magnetic pole and the second magnetic pole. The reading head is not only used for detecting the position of the magnetic poles, but also for cooperating with a displacement sensor for detecting the actual distance between the first magnetic pole and the second magnetic pole by means of the displacement sensor.
The servo driver 33 may further include a feedback port 331 for connecting to the displacement sensor 41, the programmable logic controller 32 controls the servo driver 33 through pulses, the servo driver 33 controls the servo motor 34 to drive the linear screw 35 to rotate, the displacement of the rotational movement is compared with displacement data detected by the displacement sensor 41, and the position error is fed back to the feedback port 331 of the servo driver 33 again to compensate the displacement control, which is helpful for improving the detection accuracy of the actual distance.
The servo driver 33 may be provided with a calculation comparison amplifying circuit (not shown), and the feedback of the displacement error is compensated and corrected by the calculation comparison amplifying circuit, so as to achieve accurate positioning.
In addition, the precision detector comprises a detection machine table 5, a material tray 8 arranged in parallel with the high-precision linear module 4 is arranged on the table surface of the detection machine table 5, and the magnetic grid ruler 1 is detachably arranged at the material tray 8; the detection machine table 5 is provided with an origin signal sensor 323, the origin signal sensor 323 is arranged in cooperation with the tray 8 to indicate the zero return position of the reading head 2, and the origin signal sensor 323 is coupled to an origin signal sensing port 324 of the programmable logic controller 32. The charging tray can be rectangular shape, shape and the matching of magnetic grid chi correspond, and the charging tray is parallel with the linear module of high accuracy, then is convenient for adjust the reading head on the magnetic grid chi in the messenger charging tray, the high accuracy grating chi in the linear module of high accuracy, the slider, and is parallel to each other, guarantees measuring precision.
The origin signal sensor 323 is arranged in cooperation with the tray 8 to indicate a servo origin position or a zero-returning position of the reading head, the origin signal sensor 323 is coupled to an origin signal sensing port 324 of the programmable logic controller, and before a new round of precision measurement is performed, the reading head needs to be zeroed first, that is, the control device 3 drives the reading head to return to the origin position. The home position may be a sensor to inform the readhead that this is a zero point. Of course, if the origin position does not correspond to the actual origin magnetic pole of the magnetic scale, adjustment may be performed, or after re-measurement, the actual distance may be obtained by removing the offset value.
As to the high-precision linear module, more specifically, the high-precision linear module 4 includes a housing 42, the displacement sensor 41 includes a high-precision grating scale 41, and the high-precision grating scale 41 is disposed in the housing 42; the control device 3 is integrated on the housing 42 or in the housing 42. The high integration level enables that the next measurement can be carried out immediately only by replacing the magnetic grid ruler, and the production efficiency is improved.
Specifically, when absolute value position positioning is performed, a zero-returning program of the servo system (a general term of a servo driver, etc.) needs to return to an original point, and after detecting an original point sensing signal (an original point signal sensor 323 is connected to an original point signal sensing port 324), the programmable logic controller 32 stops sending a telling pulse train to the servo driver 33, the servo motor 34 stops working, and the linear lead screw 35 and the slider 31 also stop working. After the return to the original point operation is completed, data measurement can be started, and meanwhile, the data of the reading head 2 and the data display 6 can be cleared.
The moving direction of the slide block 31 is parallel to the extending direction of the material tray 8, and the moving range of the slide block 31 exceeds the measuring range of the magnetic grid ruler 1. Thus, when the actual distance of the magnetic scale exceeds the range, for example, the range of the magnetic scale is 1000mm, and the actual distance is 1010mm, the slider can be extended and measured to a position of 1010 mm.
The control device 3 comprises a programmable logic controller 32, a servo driver 33, a servo motor 34, a linear screw 35, a slider 31 and the like, wherein the servo driver 33 comprises a feedback port 331 for coupling with the high-precision grating ruler 41; the servo driver 33 and the high precision scale 41 constitute a full closed loop position control. The programmable logic controller sends a pulse to the servo driver, the servo driver controls the servo motor to drive the linear screw rod to rotate, the displacement of the rotary movement is compared with position data detected by a displacement sensor (a high-precision grating ruler), and the position error is fed back to the servo driver to be compensated. The rotation of lead screw drives the slip table and moves, and the displacement volume (being the distance) that the magnetic grid read head (magnetic grid chi read head is installed on the slip table) can be analytic magnetic grid chi along with the removal shows through data display, can calculate the error value (being the precision) through reading data display's measured value and data display's resolution ratio.
Besides, the precision detector further comprises a data display 6, wherein the data display 6 is coupled to the reading head 2 and the high-precision linear module 4 to display the numerical value of the actual distance. Of course, when the precision detector comprises the marked distance acquisition module and the error calculation module, the data display can also display the marked distance, the comparison result, the judgment result and the like.
The human-computer interaction controller 7 and the data display 6 may be integrated into a control and display console 9, the detection platform 5 may be provided with a fixing hole 51, the control and display console 9 may be fixed to the fixing hole 51 through a support rod 91 so as to facilitate a user to view data and perform parameter setting, the human-computer interaction controller includes a touch screen and the like, and may be used for displaying data, and may also be used for performing parameter setting on the programmable logic controller 32, the servo driver 33 and the like.
The human-computer interaction controller 7 and the programmable logic controller 32 control the operations of starting, resetting, setting of the detected polar distance (pitch or grid distance), material receiving and discharging of the material tray (replacement of a magnetic grid ruler), detection delay and the like of the whole detection system.
More specifically, the software part of the precision detection machine comprises two parts, one part is the setting of software parameters, and the other part is the portability of programs. The software parameter setting mainly comprises the programmable logic controller software parameter normal setting, the servo driver parameter and the touch screen software parameter setting. The programmable logic controller software parameter setting comprises the type setting of a programmable logic controller, a pulse output channel, an origin signal and the like; the parameter setting of the servo driver comprises a pulse control mode, pulse input flow of each circle, grating ruler parameters, gain parameter setting and the like; the touch screen software parameter setting comprises a touch screen model, a communication port, a programmable logic controller type, address allocation and the like.
In the programming aspect, the programming method mainly comprises a program of a programmable logic controller and a program of a human-computer interaction controller, wherein the program of the programmable logic controller comprises high-speed pulse output, positioning position detection and comparison, zero return, fault alarm, reset and the like. The touch screen program comprises starting and zeroing. Fault resetting, material receiving and discharging of a material tray, measurement interval setting (determination of a first magnetic pole and a second magnetic pole and determination of a marked distance), measurement time interval setting and the like. The man-machine interaction controller can control the programmable logic controller to make corresponding actions through the communication with the programmable logic controller, the setting of parameters, the input and the display of calculation data and the like through buttons and the like on a man-machine interface and the like.
The specific operation flow is as follows:
FIG. 6 is a first flowchart of a method of accuracy detection according to an embodiment of the present application; FIG. 7 is a second flowchart of a method of accuracy detection of an embodiment of the present application; FIG. 8 is a program flow diagram of a programmable logic controller of a method of accuracy detection according to an embodiment of the present application; fig. 9 is a flowchart of a touch screen (human-computer interaction controller) of a precision detection method according to an embodiment of the present application, and referring to fig. 6 to 9, it can be known from fig. 1 to 5 that:
the application also discloses a precision detection method of the magnetic grid ruler, which is applied to any precision detector disclosed by the application and comprises the following steps:
s1: initializing the system and completing zero return;
s2: controlling the displacement of the reading head to detect the actual distance between the first magnetic pole and the second magnetic pole of the magnetic grid ruler;
s3: the actual distance is displayed.
Wherein the step of displaying the actual distance comprises:
s31: acquiring a marked distance and an actual distance, and calculating a difference value between the marked distance and the actual distance;
s32: comparing the difference value with a preset threshold value, and judging whether the precision of the magnetic grid ruler is qualified or not according to the comparison result to obtain a judgment result;
s33: and displaying the actual distance, the difference value, the comparison result and the judgment result.
Optionally, the step of controlling the displacement of the reading head to detect the actual distance between the first magnetic pole and the second magnetic pole of the magnetic scale comprises:
controlling the displacement of the reading head to detect the distance between the first magnetic pole and the second magnetic pole of the magnetic grid ruler;
repeating the preset times to detect and obtain the distances between the plurality of first magnetic poles and the plurality of second magnetic poles;
the plurality of distances are averaged to obtain an actual distance between the first magnetic pole and the second magnetic pole. Wherein, the preset times can be taken as 3 times; of course, regardless of the preset number of times, if data significantly different from other measurement results appear, the data are eliminated and then averaged.
When the actual distance between the first magnetic pole and the second magnetic pole needs to be detected, other magnetic poles exist between the first magnetic pole and the second magnetic pole generally, but the number of the magnetic poles between the first magnetic pole and the second magnetic pole can be predetermined, so that the reading head can count to reach a terminal magnetic pole when reaching a preset count, and the actual distance can be calculated according to feedback information of the reading head corresponding to the first magnetic pole and the second magnetic pole, so that the memory occupation can be reduced.
Of course, the reading head may update the data every time it passes a magnetic pole, and store it, and then when a preset count is reached, namely the feedback information corresponding to the second magnetic pole, and then the actual distance between the first magnetic pole and the second magnetic pole can be calculated by combining the feedback information corresponding to the first magnetic pole, by doing so, not only can the actual distance between the first magnetic pole and the second magnetic pole be calculated, and the data of each magnetic pole passing in the middle can be stored so as to calculate the mutual spacing condition of each magnetic pole passing in the middle, avoid the situation that the magnetic pole passing in the middle has serious errors, and when the measurement result is unqualified, the position of the problem causing the unqualified measurement result can be quickly determined (generally, the problem occurs in the magnetization of some magnetic poles), so that the problem can be quickly solved, and the qualification rate of the magnetic grid ruler in subsequent production is improved.
It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present application.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A precision detector of a magnetic scale having a plurality of equally spaced magnetic poles including a first magnetic pole and a second magnetic pole, comprising:
the reading head is used for detecting the magnetic poles of the magnetic grid ruler and sending a feedback signal;
the control device controls the reading head to move on the magnetic grid ruler;
and the high-precision linear module detects the actual distance between the first magnetic pole and the second magnetic pole through a feedback signal of the reading head.
2. The precision detector of a magnetic scale according to claim 1, wherein the theoretical distance between the first magnetic pole and the second magnetic pole is a marked distance, the precision detector further comprises a marked distance obtaining module and an error calculating module, the marked distance obtaining module obtains the marked distance, the error calculating module is respectively connected with the marked distance obtaining module and the high-precision linear module to obtain and compare the marked distance and the actual distance, and if the difference is smaller than a preset threshold, the magnetic scale is qualified; and if the difference value is larger than the preset threshold value, the magnetic grid ruler is unqualified.
3. The precision measuring machine of a magnetic scale according to claim 1, wherein said control means includes a slider which is slidably engaged with said magnetic scale in a direction in which said magnetic scale extends, said reading head being provided on said slider;
the control device also comprises a programmable logic controller, a servo driver, a servo motor and a linear screw rod, wherein the editable logic controller comprises a high-speed pulse output port, and the servo driver is connected with the editable logic controller through the high-speed pulse output port; the editable logic controller outputs a high-speed pulse string to the servo driver, the servo driver controls the servo motor to work according to the high-speed pulse string, and the servo motor controls the sliding block to move through the linear screw rod.
4. The precision testing machine of a magnetic scale of claim 3, further comprising a human-computer interaction controller, wherein the programmable logic controller further comprises a communication port, and the human-computer interaction controller is connected with the programmable logic controller through the communication port to realize communication.
5. The precision detector of claim 1, wherein the high precision linear module comprises a displacement sensor coupled to the read head for calculating the actual distance between the first magnetic pole and the second magnetic pole according to the feedback information corresponding to the first magnetic pole and the second magnetic pole fed back by the read head.
6. The precision detector of a magnetic scale according to claim 5, wherein the precision detector comprises a detection machine table, a tray arranged in parallel with the high-precision linear module is arranged on the table surface of the detection machine table, and the magnetic scale is detachably mounted on the tray; the detection machine is provided with an origin signal inductor, the origin signal inductor is matched with the material tray and used for indicating the zero return position of the reading head, and the origin signal inductor is coupled with an origin signal induction port of the programmable logic controller.
7. The precision detector of a magnetic grid ruler as claimed in claim 6, wherein the high-precision linear module further comprises a housing, the displacement sensor comprises a high-precision grid ruler, and the high-precision grid ruler is arranged in the housing; the control device is integrated on or in the housing.
8. The machine of claim 7, further comprising a data display coupled to the read head and the displacement sensor to obtain and display a value of the actual distance.
9. A precision detection method of a magnetic scale, which is applied to the precision detector according to any one of claims 1 to 8, characterized by comprising the steps of:
initializing the system and completing zero return;
controlling the displacement of the reading head to detect the actual distance between the first magnetic pole and the second magnetic pole of the magnetic grid ruler;
the actual distance is displayed.
10. The method of claim 9, wherein the step of displaying the actual distance comprises:
acquiring a marked distance and an actual distance, and calculating a difference value between the marked distance and the actual distance;
comparing the difference value with a preset threshold value, and judging whether the precision of the magnetic grid ruler is qualified or not according to the comparison result to obtain a judgment result;
and displaying the actual distance, the difference value, the comparison result and the judgment result.
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Application publication date: 20191227 |