CN201059947Y

CN201059947Y - Digital type linear measures device

Info

Publication number: CN201059947Y
Application number: CNU2007200962079U
Authority: CN
Inventors: 周宇浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-06-04
Filing date: 2007-06-04
Publication date: 2008-05-14
Anticipated expiration: 2017-06-04

Abstract

The utility model relates to a digital type length measurer. The utility model comprises an outer casing (1), a display device (2) arranged at the top part of the outer casing, a power supply module (13) arranged inside the outer casing (1), a line axle (5) arranged inside the outer casing (1), a handle (3) connected with the end of the line axle and rotated along with the line axle, a measuring line (12) winded on the line axle, a signal gathering device (6), and a signal processing unit (16) receiving impulse signal, the input end of the signal processing unit is connected with the output terminal of the signal gathering device, and the output terminal of the signal processing unit is connected with the input terminal of the display device. The utility model has the advantages that the cost is low, the carrying is convenient, the precision is higher, the measurable scope is larger, data can be easily read, and the utility model can be used to measure folded lines, curve lines and irregular perimeters.

Description

Digital device for measuring length

Technical field

It is the metering outfit of feature that the utility model relates to a kind of optical means that adopts, and further relates to a kind of digital device for measuring length.

Background technology

Along with the continuous progress of society, the effect of science and technology in people's life is important all the more.We know that the basis of science and technology is effective, the timely and high-precision measurement of physical signalling.All scientific activities and scientific research all are based upon on this basis, and length is that we relate to one of the most frequent physical quantity at ordinary times, become extremely important so how can measure length fast and accurately.Along with development of science and technology, we have had many high precision, distance element, and the high-tech surveying instrument of large range measuring is such as nano measurement instrument, laser measuring apparatus, optical measuring instrument etc.But these surveying instrument costs are very high, mostly are used for very high-precision experiment or research process, in general basic measurement process, can not obtain general application.When we carry out general measure at ordinary times, though surveying instrument in the past can satisfy basic requirement, but have the following disadvantages: the distance that (1) runs into when we measure is very big sometimes, from several centimetres to up to a hundred meters, surveying instrument in the past is difficult to satisfy simultaneously high precision and big measurement range; (2) for the measurement of middle and long distance, surveying instrument volume in the past is big, heavier, and survey crew carries very inconvenient in use; (3) surveying instrument in the past directly is marked on scale on the surveying instrument mostly, and along with the growth of service time, scale can wear and tear, and influences reading.Add that the error when producing exists, can make the precision of long range measurements instrument reduce; (4) surveying instrument in the past, as tape measure, ruler etc., the material flexibility of surveying instrument is not fine, volume is bigger, thus only be fit to measure air line distance, many again broken lines, all very inconvenient when curve and irregular circumferential measurements, and precision reduces greatly.

Summary of the invention

The purpose of this utility model is to provide a kind of cost low, easy to carry, and precision is higher, but weight range is bigger, is easy to reading, can measure broken line, the surveying instrument of curve and irregular girth.

The measuring appliance that the utility model relates to comprises: shell 1, be located at the display device 2 of cover top portion, be located at the power supply power module 13 of shell 1 inside, be located at the bobbin 5 of shell 1 inside, the handle 3 that links to each other and can rotate with bobbin with the bobbin end, be wrapped in the slotted line 12 on the bobbin, signal pickup assembly 6, the signal processing unit 16 of received pulse signal, the input end of signal processing unit 16 links to each other with the output terminal of signal pickup assembly 6, and the output terminal of signal processing unit 16 links to each other with the input end of display device 2.

Above-mentioned signal pickup assembly 6 comprises: with the pulley 11 of slotted line rubbing contact, the toothed disc of rotation under pulley 11 drives is sent the grating sensor 10 of pulse signal when toothed disc is rotated.

Above-mentioned signal processing unit 16 comprises: pulse shaping circuit 7, and the shaping pulse that grating sensor is exported is the square-wave signal of standard; Pulse-recognition circuit 8 judges that signal is the pulse that unwrapping wire or take-up produce; Microprocessor 9, the counting of pulse signals calculates the distance value of measurement.

Above-mentioned pulse shaping circuit 7 is made of Schmidt trigger; Above-mentioned pulse-recognition circuit 8 is made of two d type flip flops; Above-mentioned microprocessor 9 is a single-chip microcomputer.

Above-mentioned display device 2 can be LED or LCD.

In order to carry, further can also comprise: be positioned at the draw ring 4 of slotted line end, be positioned at data storage/reading device button 14 and power switch button 15 on the shell with easy to operate.

In order to prevent that slotted line breaks away from pulley 11, can also comprise a rubber blanket that is located between slotted line 12 and the pulley 11, slotted line 12 is clamped in advance, make slotted line 12 can not break away from pulley 11.

During measurement, by the action of lay and recover wire, drive fluted disc and rotate, grating sensor sends pulse signal, export signal processing unit to, become the square-wave signal of standard through the pulse shaping circuit, judge the pulse that unwrapping wire or take-up produce by pulse-recognition circuit, the pulse signal input microprocessor, microprocessor is by the counting of pulse signals, calculate the distance value of measurement, the input end of display unit links to each other with signal processing circuit, measures distance value in order to demonstration.

The related digital length-measuring appliance of the utility model has following advantage:

(1) can be automatic, the distance value that real-time demonstration is surveyed, and adopt grating sensor to measure the rotation of fluted disc, and converse corresponding distance value then, very high precision is arranged.

(2) the employed slotted line of the utility model can be arbitrarily crooked, makes this measuring appliance not only can measure straight length, also can be used for non-rectilinear, the measurement of irregular girth etc.

Description of drawings

With embodiment the utility model is described in detail with reference to the accompanying drawings.Wherein:

Fig. 1 is a structural drawing of the present utility model;

Fig. 2 is a theory diagram of the present utility model;

Fig. 3 is collecting sensor signal circuit theory diagrams of the present utility model;

Fig. 4 is a pulse shaping circuit schematic diagram of the present utility model;

Fig. 5 is a signal recognition circuit schematic diagram of the present utility model;

Embodiment

Contrast Fig. 1, digital device for measuring length comprises: shell 1, be located at the display device 2 of cover top portion, be located at the power supply 15 of shell 1 inside, be located at the bobbin 5 of shell 1 inside, the handle 3 that links to each other and can rotate with bobbin with the bobbin end, be wrapped in the slotted line 12 on the bobbin, signal pickup assembly 6, the signal processing unit 16 of received pulse signal, the input end of signal processing unit 16 links to each other with the output terminal of signal pickup assembly 6, and the output terminal of signal processing unit 16 links to each other with the input end of display device 2; Be positioned at the draw ring 4 of slotted line end, be positioned at the data storage/reading device button 14 and the power switch button 15 on shell 1 top, the rubber blanket between slotted line 12 and pulley 11 clamps in advance to slotted line 12, makes slotted line can not break away from pulley.

Contrast Fig. 2, signal acquisition circuit mainly is made up of grating sensor, and the distance signal that grating sensor collects passes to Schmidt trigger after being converted to digital pulse signal.Schmidt trigger carries out shaping with digital pulse signal, and the square-wave signal that the later pulse signal of shaping becomes standard is sent on the d type flip flop.D type flip flop judges it is take-up or unwrapping wire according to square-wave signal, and when unwrapping wire, the take-up pulse signal of d type flip flop is with conductively-closed, the unwrapping wire signal open (CD1=0, CD2=1), when take-up, unwrapping wire signal on the trigger will shield, the take-up signal open (CD1=1, CD2=0).D type flip flop sends signal to single-chip microcomputer by two exterior terminals.Single-chip microcomputer writes down the plus-minus numeration that take-up and unwrapping wire pulse realize the paired pulses number respectively, pulse number is converted into physical length stores in the storer and through the LED seven-segment display actual range is shown.Above-mentioned grating sensor, Schmidt trigger, d type flip flop, single-chip microcomputer, nixie display etc. all can be bought relevant chip or module on market, do not do detailed description at this.

Contrast Fig. 3, the collecting sensor signal circuit is realized distance signal is converted to digital pulse signal, for the CPU calculation process, sensor adopts grating sensor, in backguy and take-up process, code-disc can be respectively to the both direction rotation, and corresponding grating sensor can send the digital pulse signal of both direction.The output pulse number is the number of teeth that code-disc rotates through, tooth spiral is changeed the distance walked and sensor acquisition to the number of teeth multiply each other and be the distance of actual measurement.Pulse of every output, light emitting diode triggers two JFET that reversal connection, and produces the opposite pulse signal of two-way and passes to Schmidt trigger.When just changeing, OUT1 exports positive signal, and OUT2 exports designature; When counter-rotating, OUT1 exports designature, and OUT2 exports positive signal.

Contrast Fig. 4, two Schmidt triggers, its mode of connection is identical.Schmidt trigger belongs to level triggers, stands good for the signal of slow variation.When input signal reached a certain magnitude of voltage, output voltage can be undergone mutation.Carry out shaping so the effect of this trigger is the pulse signal with signal pickup assembly output, the pulse signal is become the square wave of standard, filtering interference signals simultaneously.

Contrast Fig. 5, signal recognition circuit principle of the present utility model is as follows: Schmidt trigger will send d type flip flop to through the square-wave signal of shaping.When take-up, when IN1 is effective, make that the U3A input clock pulse signals is effective, U3A starts working, and OUT1 exports useful signal, interrupts thereby single-chip microcomputer produces INT0, gives the CD end set of U3B when IN1 is effective simultaneously, makes the U3B zero clearing, can not work; When take-up, when IN2 is effective, make that the U3B input clock pulse signals is effective, U3B starts working, and OUT2 exports useful signal, interrupts thereby single-chip microcomputer produces INT1, gives the CD end set of U3A when IN2 is effective simultaneously, makes the U3B zero clearing, can not work.

The main program flow of microprocessor operation of the present utility model is as follows: behind the electrification reset, at first the initialization microprocessor interrupts, input interface, and output interface and LED show.Judged whether the look-at-me input then,, then waited for if there is not the signal input.If the signal input of interruption is arranged, then judges it is direct impulse or reverse impulse.(the corresponding backguy process of direct impulse, the corresponding take-up process of reverse impulse) paired pulses number then counted, and receives that whenever a direct impulse count value adds 1, receives that whenever a reverse impulse count value subtracts 1.According to obtaining count value, be converted into actual distance measure, and judge whether to exceed measurement range then, at last the distance value that records is shown with LED.

Claims

1. digital device for measuring length, it is characterized in that, comprise: shell (1), be located at the display device (2) of cover top portion, be located at the inner power module (13) of shell (1), be located at the inner bobbin (5) of shell (1), the handle (3) that links to each other and can rotate with bobbin with the bobbin end, be wrapped in the slotted line (12) on the bobbin, signal pickup assembly (6), the signal processing unit of received pulse signal (16), the input end of signal processing unit links to each other with the output terminal of signal pickup assembly, and the output terminal of signal processing unit links to each other with the input end of display device.

2. a kind of according to claim 1 digital device for measuring length, it is characterized in that, described signal pickup assembly comprises: with the pulley (11) of slotted line rubbing contact, drive the toothed disc of rotating down at pulley (11), send the grating sensor (10) of pulse signal when toothed disc is rotated.

3. a kind of according to claim 1 digital device for measuring length is characterized in that, described signal processing unit (16) comprising:

Pulse shaping circuit (7), the shaping pulse that grating sensor is exported is the square-wave signal of standard;

Pulse-recognition circuit (8) judges that signal is the pulse that unwrapping wire or take-up produce;

Microprocessor (9), the counting of pulse signals calculates the distance value of measurement.

4. as a kind of digital device for measuring length as described in the claim 2, it is characterized in that described pulse shaping circuit (7) is made of Schmidt trigger.

5. as a kind of digital device for measuring length as described in the claim 2, it is characterized in that described pulse-recognition circuit (8) is made of two d type flip flops.

6. as a kind of digital device for measuring length as described in the claim 2, it is characterized in that described microprocessor (9) is a single-chip microcomputer.

7. a kind of according to claim 1 digital device for measuring length is characterized in that described display device (2) can be LED or LCD.

8. as claim 1 to 6 a kind of digital device for measuring length as described in any one, it is characterized in that, also comprise: the draw ring (4) that is positioned at the slotted line end.

9. as claim 1 to 6 a kind of digital device for measuring length as described in any one, it is characterized in that, also comprise: data storage/reading device button (14) and power switch button (15);

10. as claim 1 to 6 a kind of digital device for measuring length as described in any one, it is characterized in that, also comprise a rubber blanket that is located between slotted line and the pulley (11), slotted line is clamped in advance, make slotted line can not break away from pulley.