CN105241321A - Digital display caliper automatic detection system - Google Patents

Abstract

The invention relates to a digital caliper automatic detection system, which includes a computer, a digital caliper measurement system, a grating detection system, and a drive controller. The computer is connected to the grating detection system through RS232, and the digital caliper measurement system is The communication expansion interface is left to connect with the computer. At the same time, the computer is responsible for communication control of the drive controller. The computer controls the movement of the motor through the drive controller, analyzes the data collected by the grating detection system and the digital caliper measurement system, and automatically realizes the automatic correction of the digital caliper measurement system. The invention has high control precision and high work efficiency, reduces the error of manual calibration, and improves the efficiency of producing digital calipers.

Description

A digital caliper automatic detection system

technical field

The invention relates to an automatic detection system for a digital caliper.

Background technique

The 21st century is the information age, and the integration of information technology and manufacturing technology is the main direction of the development of manufacturing technology in the 21st century. The rapid development of modern science and technology has created conditions for the progress and development of detection technology. At the same time, it has continuously put forward higher and newer requirements for detection technology. At present, most domestic manufacturers are using the manual detection method - the metal gauge block detection method, while the traditional manual detection method has high work intensity, low efficiency, and large human errors, so the current manual detection method is getting more and more popular. The more unable to meet the requirements of modern production, the digital caliper automatic detection system is needed to replace the manual detection method. Not only can the caliper be calibrated and measured according to the current national metrology verification regulations, but also any size position of the caliper can be measured. The digital display is realized while using the microcomputer to automatically correct the error, making the measurement work more intuitive and convenient.

Contents of the invention

The purpose of the present invention is to reduce large manual errors, improve production efficiency, and provide a digital caliper that can accurately detect the deviation of each detection point by feeding back the data of the digital caliper detection point to the computer and comparing it with the standard value of the detection point. Caliper automatic detection system. The digital caliper automatic detection system based on a high-precision grating detection system solves the defects of existing manual detection: high work intensity, low efficiency, and large errors.

In order to achieve the above object, a kind of digital caliper automatic detection system of the present invention comprises computer, digital caliper measurement system, grating detection system, drive controller, and computer is connected with grating detection system by RS232, and digital caliper is connected by USB The detection system and drive controller are connected separately.

The drive controller includes a control board and a stepping motor, and the control board receives the displacement command sent by the computer to control the direction and displacement of the stepping motor.

The computer has two modes of manual detection and automatic detection.

The manual detection mode refers to artificially input the displacement distance of the detection points, and detect all the detection points one by one.

The detection process of the automatic detection mode is as follows: ①The head of the digital caliper is tightly closed, loaded on the instrument, and the computer reads the current value of the grating as the absolute origin ABS0; ②Input the number of times n to be detected on the computer, and send the The displacement command of a detection point is used for positioning; ③The control board receives the displacement command and replies that the reception is successful to the computer, and sends pulses to control the movement of the stepper motor; ④After the movement is completed, the control board sends a movement completion command to the computer; ⑤The computer receives After the movement command is completed, read the current value and subtract the modulus from ABS0 to calculate the actual moving distance S0; ⑥ Prepare to check the next detection point until all detection points are detected; ⑦ Repeat the detection n times to obtain n groups of displacements The data is filtered by the mean value, and the measured value is replaced by the mean value. Finally, the least square method is used to perform linear fitting on the mean value of the group, and the parameters obtained are input into the caliper.

The average value is calculated by using the average filtering method for n sets of data, and the average value of the n data of each point is calculated to replace the measured value, and finally a set of average values is obtained.

The beneficial effects of the present invention are: the present invention solves the problems of slow traditional manual detection and large manual errors, especially the introduction of a grating detection system, which greatly improves the detection accuracy. Therefore, it has the advantages of high detection accuracy, fast speed, simple and convenient operation, etc. The advantages of the invention greatly meet the detection requirements of the digital caliper industry, and have great development potential and application prospects.

Description of drawings

Fig. 1 is the structural representation of digital caliper automatic detection system of the present invention;

Fig. 2 is the communication flowchart of digital caliper automatic detection system of the present invention;

detailed description

Fig. 1 is a schematic structural view of the digital caliper automatic detection system of the present invention. The present invention is a digital caliper automatic detection system, which mainly includes a computer, a digital caliper measurement system, a grating detection system, and a drive controller. The computer is connected to the grating detection system through RS232, and the digital caliper measurement system reserves a communication expansion interface. It is connected with the computer, and at the same time, the computer is responsible for communication control of the drive controller.

There are two modes on the manual interface of the computer: manual detection and automatic detection. Manual detection needs to input the displacement of detection points one by one, and any point can be detected in this detection mode. In the automatic detection mode, the detection points set in the digital caliper measurement system are detected one by one.

The detection process of the automatic detection mode is as follows: ①The head of the digital caliper is tightly closed, loaded on the instrument, and the computer reads the current value of the grating as the absolute origin ABS0; ②Input the number of times n to be detected on the computer, and send the first detection ③The control board receives the displacement command and replies that the reception is successful to the computer, and sends pulses to control the movement of the stepper motor; ④After the movement is completed, the control board sends the movement completion command to the computer; ⑤The computer receives the movement completion command Finally, wait for the grating to stabilize, read the current value and ABS0 to take the modulus, and calculate the actual moving distance S0; ⑥ prepare for the verification of the next detection point; ⑦ repeat the detection n times to obtain n sets of displacement data, and use The average value replaces the measured value, and finally the least square method is used to perform linear fitting on the group average value, and the obtained parameters are input into the caliper.

The average value is calculated by using the mean filtering method for n groups of data. Let n groups of measured values form n arrays as X ₁ , X ₂ , X ₃ ... X _n , and take the average value of each corresponding value in these arrays, namely:

Get a set of mean values X. The set of values X and the standard value Y output by the grating are linearly fitted by least squares, and the fitting equation can be obtained: Y=aX+b, where a and b represent the first-order coefficient and the constant term respectively, and the obtained Input a and b into the caliper to complete the detection.

The above description is an explanation of the present invention, not a limitation of the invention. For the limited scope of the present invention, please refer to the claims. Within the protection scope of the present invention, any form of modification can be made.

Claims (6)

1. a digital display calliper automated detection system, it is characterized in that: described digital display calliper automated detection system comprises computing machine, digital display calliper measuring system, Grating Detecting System, driving governor, described computing machine is connected with Grating Detecting System by RS232, is connected respectively with digital display calliper detection system, driving governor by USB.

2. digital display calliper automated detection system as claimed in claim 1, is characterized in that: described driving governor comprises control panel and stepper motor, the direction of the displacement commands control step motor that control panel receiving computer sends and displacement.

3. digital display calliper automated detection system as claimed in claim 1, is characterized in that: described computing machine has manual detection and automatically detects two patterns.

4. digital display calliper automated detection system as claimed in claim 3, is characterized in that: described manual detection pattern refers to the shift length inputting check point artificially, detects one by one all check points.

5. digital display calliper automated detection system as claimed in claim 3, is characterized in that: the testing process of described autosensing mode is as follows: 1. digital display calliper chi head closes, is loaded on instrument, and computing machine reads grating currency, as absolute initial point ABS0; 2. input needs the frequency n of detection on computers, and the displacement command sending first check point positions; 3. control panel receive displacement command reply receives successfully give computing machine, and send Pulse Width Control stepper motor move; 4., after movement completes, control panel sends and has moved order to computing machine; 5., after computing machine receives and moved order, reading currency and ABS0 subtract each other delivery, calculate actual displacement S0; 6. the verification carrying out next check point is prepared, until all check points have detected; 7. repeatedly detect n time, obtain n group displacement data, carry out mean filter, replace measured value with mean value, finally adopt least square method to carry out linear fit to this cell mean, obtain parameters input in slide calliper rule.

6. digital display calliper automated detection system as claimed in claim 5, it is characterized in that: described mean value is that n group data acquisition mean filter method calculates, n data of each point are calculated mean value to replace measured value, finally obtains a cell mean.