CN202119880U

CN202119880U - Switch parameter measuring apparatus

Info

Publication number: CN202119880U
Application number: CN2011202416352U
Authority: CN
Inventors: 卢超
Original assignee: Shaanxi University of Technology
Current assignee: Shaanxi University of Technology
Priority date: 2011-07-11
Filing date: 2011-07-11
Publication date: 2012-01-18
Anticipated expiration: 2021-07-11

Abstract

The utility model relates to a switch parameter measuring apparatus, including a machinery button motion device, a pressure transducer, an A/D data acquisition device, a button circuit, a liquid crystal display screen, a six-circuit relay switch, an MAX 232 serial port data communication module, a PC and a one-chip microcomputer. The machinery button motion device is connected with the pressure transducer; the output terminal of the pressure transducer is connected with the A/D data acquisition device; the button circuit and the A/D data acquisition device are respectively connected with output terminal of the one-chip microcomputer; the output terminal of the one-chip microcomputer is respectively connected with the liquid crystal display screen for displaying processed data and the six-circuit relay switch for controlling the closing of the relay; and the output terminal of the one-chip microcomputer is connected with the PC through the MAX 232 serial port data communication module. In the switch parameter measuring apparatus provided in the utility model, the performance is stable; the work is reliable; the measure precision is high; the value display stability is good; and the system expansion capability is strong.

Description

The switch parameter measuring instrument

Technical field

The utility model relates to the technical field of instrument and meter design, especially a kind of switch parameter measuring instrument that can be applicable to the detection of keyswitch non-defective unit and defective products on the production line.

Background technology

Keyswitch application of today be suitable extensively, in production, also be omnipresent in life not only.For example: mobile phone, the networking telephone, all kinds of telepilot, MP3/MP4, radio, digital camera, learning machine, game control keyboard, micro-wave oven, fascia, telescope, toy etc.So the demand of keyswitch also is very big, and produces in batches in the process of keyswitch, this link of quality testing is considerable; Here will use a kind of instrument, be " keyswitch loading displacement curve appearance ", two latitude coordinates are stroke with the X axle exactly; With the Y axle is the curve testing tool of the size variation formation of induction force; Measure various switches specially, button, shell fragment and some elastic things.The loading curvometer is because instrument not merely is to test out the various strength that need the workpiece of measurement, most importantly can find out the loading process of switch, and whole loading process is to show to show through curve, and is very directly perceived.

Along with the fast development of electronic technology and control technology, keyswitch loading displacement curve appearance also will keep pace with the times, and can only measure OF, OD and CK value from the beginning and develop into now and can measure 23 parameters simultaneously; PK is arranged; CK, RPK, RLK; LK is equivalent, can protect instrument to be damaged by pressure the loading inductor through setting bound.Minimum demonstration stroke also develops into present 0.001mm from 1mm; Minimum demonstration loading is also from 10 gram precision, 0.01 gram precision till now; Interface setting also utilizes WINDOWS Chinese viewing window pictures to set from embedded developing into now; Simple to operation, and all data all can store (test condition, loading curve map, test result, inspection form ... Or the like).Peak Force, ReturnForce, Distance and Click lead etc. all can directly show numerical value on figure, must manual calculation; Measure curve map by computer memory, can amplify at any time, dwindle, an A4 paper can be specified arbitrarily and placed N curve map; The mensuration project can be imported the upper and lower limit specification value, measures the result and can judge OK or NO automatically; Can import maximum measure stroke and loading, computer is controlled automatically; Loading unit shows that N, Ib, gf, kgf can freely switch; Computer is directly printd and is stored loading-stroke curve figure, inspection form (do not need square paper, general A4 paper gets final product); Test data is stored in hard disk (each document all can store, and does not limit number of times); Test condition is all set (containing test stroke, speed, number of times, pneumatics, time out or the like) by the computer picture; Check form new line content can be revised (Chinese and English all can) at any time; The check form can produce automatically, must not remake input; The check form can be exchanged into document statement forms such as Excel.

At present, maximum switch measuring instrument of use, what the pressure transducer of employing used is resistance strain gage, it is very thin that it has paper tinsel grid, can reflect the distortion of component surface preferably, thereby measuring accuracy is higher; Be convenient to a large amount of productions, cost is low, and therefore, foil strain gauge is used widely, but the response speed of this foil gauge is slow excessively, only is fit to be applied to pressure and changes slow occasion, in addition, exists poor stability, precision low.

The utility model content

The technical matters that the utility model will solve is: in order to overcome the above-mentioned middle problem that exists, the switch parameter that a kind of response speed is fast, measuring accuracy is high measuring instrument is provided.

The utility model solves the technical scheme that its technical matters adopted: a kind of switch parameter measuring instrument, to form by mechanical key movement device, pressure transducer, A/D data acquisition, key circuit, LCDs, six road relay switchs, MAX232 serial data communication module, PC and single-chip microcomputer, and it is the course of action of analogue-key switch that the mechanical key movement device mainly acts on; Make speed that button presses down and stressed all even; Formed pressure history of actuation of keys of keyswitch is stable and accurately like this, if without mechanical hook-up, presses the words of keyswitch with hand; Stressed and the speed of at every turn pressing keyswitch is all inhomogeneous also different; Possibly cause in the A/D sampling interval, gathering less than extreme point, cause erroneous judgement, main motor adopts electric capacity phase-splitting reversible jaw pole permanent-magnet synchronous machine; This motor characteristic feature is that rotating speed is slow; Speed is well-balanced, and dynamics is even, and positive and negative both direction is controlled.Connect the A/D data acquisition on the described pressure transducer output terminal; Described key circuit is connected with the single-chip microcomputer input end respectively with the A/D data acquisition; Key circuit has adopted four stand-alone keypad to be connected with single-chip microcomputer as the man-machine setting interface of adjusting parameter; This single-chip microcomputer is the ATmega32 single-chip microcomputer, and ATmega32 is based on 8 CMOS microcontrollers of low-power consumption of the AVR risc architecture of enhancing, the highest 16MHz crystal oscillator that connects in outside; Because its advanced instruction set and single clock cycle instruction time; The data throughput of ATmega32 is up to 1MIPS/MHz, and be the single clock period most of instruction times, and be 1/16MHz ≈ 0.062us the fastest instruction time.Described mechanical key movement device is connected with pressure transducer; Be connected with the LCDs that is used for data after the display process six road relay switchs closed on the single-chip microcomputer output terminal respectively and be connected with PC through MAX232 serial data communication module with being used for pilot relay, six road relay switchs corresponding respectively the upper and lower limit alarming value of OF, CK, OD, all can closure in case be higher than mxm. or be lower than the minimum relay; Pilot lamp can be bright simultaneously; Represent this road relay closes, MAX232 serial data communication module comprises the IC chip of two-way receiver and driver, is applicable to various EIA-232C and communication interface V.28/v.24; MAX232 serial data communication inside modules has a power supply converter; Can input+the 5V supply voltage is for conversion into the RS-232C output level required+10V voltage, so, adopt the serial communication system of this chip interface only to need single+5V power supply just passable; For not having+occasion of 12V power supply; Its adaptability is stronger, its moderate cost in addition, and hardware interface is simple.

In order to have antitorque, anti-side and anti-bias load ability, response speed faster, described pressure transducer is a S type pull pressure sensor.

The beneficial effect of the utility model switch parameter measuring instrument is: use the combination of single-chip microcomputer and A/D data acquisition, can reduce system cost effectively and can satisfy data acquisition request; Adopt S type pull pressure sensor, have stronger antitorque, anti-side and anti-bias load ability, response speed faster, measuring accuracy height, good stability, temperature drift be little, export the good and compact conformation, complete in specifications of symmetry; This measuring instrument stable performance, reliable operation has the measuring accuracy height, and stability of display is good, and the system extension ability is strong.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1 is the structural representation of the utility model.

1. mechanical key movement devices among the figure, 2. pressure transducer, 3.A/D data acquisition, 4. key circuit, 5. LCDs, 6. six road relay switchs, 7.MAX232 serial data communication module, 8.PC machine, 9. single-chip microcomputer.

Embodiment

Combine accompanying drawing that the utility model is done further detailed explanation now.These accompanying drawings are the synoptic diagram of simplification, the basic structure of the utility model only is described in a schematic way, so it only show the formation relevant with the utility model.

Switch parameter measuring instrument as shown in Figure 1; Form by mechanical key movement device 1, S type pull pressure sensor 2, A/D data acquisition 3, key circuit 4, LCDs 5, six road relay switchs 6, MAX232 serial data communication module 7, PC 8 and single-chip microcomputer 9; Mechanical key movement device 1 is connected with pressure transducer 2; Connect A/D data acquisition 3 on S type pull pressure sensor 2 output terminals; Key circuit 4 is connected with single-chip microcomputer 9 input ends respectively with A/D data acquisition 3, is connected with the LCDs 5 that is used for data after the display process six road relay switchs 6 closed with being used for pilot relay on single-chip microcomputer 9 output terminals respectively and is connected with PC 8 through MAX232 serial data communication module 7.

The principle of work of the switch parameter measuring instrument of the utility model: the external interrupt of first triggering system; Simultaneously LCDs 5 is carried out cls; Expression can begin to have carried out A/D data acquisition 3, and open the shift knob of mechanical key movement device 1 this moment, and the connecting rod pressure arm of mechanical key movement device 1 is with the even velocity pressed downward; Accomplish after the switch motion; Mechanical key movement device 1 can recover the original position automatically, and single-chip microcomputer 9 begins to handle the data after the A/D data acquisition 3, and process result shows on LCDs 5 simultaneously; And make the relay closes in corresponding six road relay switchs 6 according to the result, also on PC 8, send dependent instruction simultaneously through MAX232 serial data communication module 7.So far, the measuring process of a keyswitch finishes.

With above-mentioned desirable embodiment according to the utility model is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this utility model technological thought.The technical scope of this utility model is not limited to the content on the instructions, must confirm its technical scope according to the claim scope.

Claims

1. switch parameter measuring instrument; It is characterized in that: form by mechanical key movement device (1), pressure transducer (2), A/D data acquisition (3), key circuit (4), LCDs (5), six road relay switchs (6), MAX232 serial data communication module (7), PC (8) and single-chip microcomputer (9); Described mechanical key movement device (1) is connected with pressure transducer (2); Connect A/D data acquisition (3) on described pressure transducer (2) output terminal; Described key circuit (4) is connected with single-chip microcomputer (9) input end respectively with A/D data acquisition (3), is connected with the LCDs (5) that is used for data after the display process six road relay switchs (6) closed with being used for pilot relay on single-chip microcomputer (9) output terminal respectively and is connected with PC (8) through MAX232 serial data communication module (7).

2. switch parameter measuring instrument according to claim 1 is characterized in that: described pressure transducer (2) is a S type pull pressure sensor.