CN2159856Y

CN2159856Y - Strain type digital indicating socket torque spanners

Info

Publication number: CN2159856Y
Application number: CN 93214262
Authority: CN
Inventors: 许万雍; 钱美英; 王云宏; 沈培光; 汤一清
Original assignee: YA-AO COMPUTER TECHNOLOGY INST QINGHUA BEIJING
Current assignee: YA-AO COMPUTER TECHNOLOGY INST QINGHUA BEIJING
Priority date: 1993-05-29
Filing date: 1993-05-29
Publication date: 1994-03-30
Anticipated expiration: 2003-05-29

Abstract

The utility model relates to a strain type digital indicating socket force moment spanners, composed of a spanner head (1), a connecting bar (2), a spanner bar (4), a spanner handle box (5), etc. The utility model is characterized in that strain sheets (3) are pasted on the two sides of the connecting bar (2), a circuit board (6) and an electric cell (7) are arranged in the spanner handle box (5), force moment signals are detected by the strain sheets (3), sent by an amplifier and an A/D convertor to the single chip micro-processing chip CPU, processed by the single chip micro-processing chip CPU, and finally send to a digital liquid crystal display (9) for displaying.

Description

Strain type digital indicating socket torque spanners

The utility model is about a kind of fastened tools, and a kind of strain-type numeral of more specifically saying so shows the sleeve torque spanner.

Chinese patent CN2100289U discloses a kind of automatic demonstration torque-indicating wrencg, though this spanner energy measurement and demonstration are applied to the moment on the spanner, it is simple that it exists function, can not solve the drift problem, and its accuracy can not reach very high.

The purpose of this utility model addresses the above problem exactly, provides a kind of strain-type numeral to show the sleeve torque spanner.He not only has zero compensation, and also has multiple Presentation Function and warning function.

Show the sleeve torque spanner according to strain-type numeral of the present utility model, it is made up of driving end (1), connecting rod (2), wrenching bar (4), wrenching handle case (5) etc., it is characterized in that: foil gauge (3) is being pasted the both sides of connecting rod (2), circuit pulls (6) and battery (7) is contained among the wrenching handle case (5), detect torque signals by foil gauge (3), deliver to the little process chip CPU of monolithic again through amplifier, A/D converter and handle, deliver to digital lcd (9) at last and show.Below in conjunction with accompanying drawing the utility model strain-type numeral is shown that the specific embodiment of sleeve torque spanner is described in detail.

Figure 1A is the vertical view that the utility model strain-type numeral shows the sleeve torque spanner.

Figure 1B is I-I among Figure 1A ' profile.

Fig. 2 is the schematic diagram of explanation strain measurement principle.

Fig. 3 is the concrete circuit that the utility model strain-type numeral shows the circuit part of sleeve torque spanner.

Fig. 4 A, 4B are the software flow patterns that the utility model strain-type numeral shows the sleeve torque spanner.

At first referring to Figure 1A and Figure 1B, the utility model strain-type numeral shows the sleeve torque spanner, comprises driving end 1, wrenching bar 4, handle box 5.Driving end 1 is connected with wrenching bar 4 by connecting rod 2, and connecting rod 2 fuses with driving end 1, and is inserted among the wrenching bar 4, and being bonded with its operation principle back of foil gauge 3(will describe in detail in the both sides of connecting rod 2).Handle box 5 can be divided into upper casing and lower casing, at handle box 5 front upper parts circuit is housed and pulls 6, at the rear portion of handle box 5 battery 7 is housed, and acoustical generator 8, digital lcd 9 and various function operating key 10 also are housed in the front portion of handle box 5.Foil gauge 3 detects the moment on the spanner when spanner uses, and by electric wire this signal is delivered to circuit and pull 6, delivers to acoustical generator 8 and digital lcd 9 again after the process circuit is pulled various processing of circuit, thereby finishes various functions.

Below in conjunction with Fig. 2 and Fig. 3 strain measurement principle in the utility model is described.When to the spanner application of force, connecting rod 2 will deform, and the foil gauge 3 that at this moment is attached to above the connecting rod 2 deforms, thereby changes its resistance value, and foil gauge one has 4, and they are respectively corresponding to the strain resistor YR among Fig. 3 _1-4, R ₁, YR ₃Be attached to the same side of connecting rod 2, YR ₂, YR ₄Then all be attached to the opposite side of connecting rod 2, they have constituted a bridge circuit.When bar was subjected to moment, bar can be crooked shown in dotted line, so YR _1,3The elongation resistance strengthens YR _2,4Shorten resistance and reduce, then the electric bridge disequilibrium produces output signal and delivers to amplifier.

In Fig. 3, voltage-stablizer is by ICE(MC1403) constitute 1 end input power supply V _DD, the voltage of 2 ends output voltage stabilizing is given electric bridge, keeps strain to survey reason stability.Amplifier is by IC2(ICL7650) and accessory circuit form,

input

4 and 5 connects electric bridge output, output 10 send IC2.Electricity W1 changes multiplication factor, the ratio that is used to calibrate spanner.IC3 and accessory circuit thereof have been formed 6 passage list range analog-digital converters, it is converted to time interval to the input analog voltage signal, give CPU(IC4), measure siding-to-siding block length by CPU in this interval inside counting, this has represented input voltage, and CPU begins for 3 signallings (RAMP start) expression time interval of IC3.7 points (COMP OUT) of IC3 are the time interval square waves of comparator output, give CPU timing, and 4 external capacitors of IC3 are used to produce the charging capacitor of ramp voltage.8 external reference voltages of IC3,6 external reference currents.1,2,16 of IC3 is three gating addresses, CPU sends this address, one of 6 inputs of gating, six input channels are as follows: the voltage to be measured of 10 input IC2 input, 11 input voltages, 12 input reference voltages, potentiometer output voltage of 13 inputs, change the gain (changing it) that forward applies moment according to this input by CPU, compensate the poor of the positive and negative gain that adds moment with this, 15 another potentiometer output voltages of input determine to use one of four kinds of moment ranges according to this voltage, 9 input power supply V _DDVoltage after partial is used to find that supply voltage is low excessively, so that display alarm.

LCD is that special liquid crystal shows sheet: displaying contents as shown in the figure.Comprising 8 groups of literal: DIRECT, MEMORY, SIGNAL, LOBAT, FILb, INLb, NM and MKG.Also have 4 numerals and 3 decimal points between numeral.It has 22 pins.

DIRECT, MEMORL, be respectively applied for and show that spanner is in one of three kinds of working methods: direct mode, storage mode, setting-aspect.LOBAT display power supply brownout, FILb, IMLb, NM, MKG are respectively applied for and show one of four kinds of measurement units selecting for use: Foot-Pound, pound, Newton meter, kilogram-metre, every group of literal (adding DIRECT) show simultaneously or extinguish, and therefore only select light on and off with one (bit).Then require 8bit to select altogether.

4 bit digital and 3 decimal points show corresponding moment values by working mode selection.Each numeral is made up of 7 line segments, select to show 7 in relevant line segment, can show 0,1,2,3,4,5,6,7,8,9 or E.When applying moment greater than range, 4 bit digital show EE.Therefore the bits per inch word is selected by 7bit, and 4 bit digital are selected by 28bit, and 3 decimal points are selected by 3bit.

In a word, literal, numeral, decimal point, the common need be selected by 39bit.But chip has only 22 pins.Each selects 2 display elements so arrange 20

pins.Pin

1 and 22 transmits COM1 and COM2 signal.They select one of 2 functions for each pin.Add pin 21, when the COM1 signal is arranged, transmit the MEMORY signal, transmit DIRECT when COM2 is arranged.

IC4(80C51) be to include the ROM(external storage in the 80C51 of the Philips company series) single place sheet microprocessor controller chip.Its recovery end 9(RST) outside connected switch K4(is used to connect the ON RESET switch of power supply and state restoration).Its end (EA) that draws connects high potential, selects to use chip internal program memory.It has four IO mouths, and each mouth has 8bit.Have the bit of 32 IO, the 1-8 of die terminals O, 21-28,36-39 totally 20 show signal for LCD panel provides 20bit, 33 and 34 provide COM1 and COM2 to LCD panel.35 driving buzzers and light emitting diode (in setting-aspect, when applying moment greater than the value of setting, sounding is also luminous).13 outside connected switch K1 (MODE) change working method.15 outside connected switch K2(UNIT) change work unit.16 outside connected switch K3(SET) but incremental is set moment values.14 RAMP start(3 that meet IC3) issue IC3 oblique wave commencing signal (beginning analog-to-digital conversion).12 COMP OUT(7 that meet IC3), receive the time interval of IC3 output.13,10,11 A2, A1, AO points (2,1,16) that meet IC3 are given IC36 channel selecting address.17 are sent power supply self-insurance current potential, and after being begun to make T1 and T2 conducting and connected power supply by K4,17 outputs are high, keep T ₁And T ₂Logical.After spanner did not use above 2 minutes and 40 seconds, it is low that CPU transfers 7 outputs to, T ₁And T ₂End, dump realizes not using automatic outage.

Parts such as CPU, RAM, ROM, 4 I/O mouths, timer are arranged in the IC4 chip, be integrated in a special-purpose core place sheet.

Just because of adopted the drive unit of chip microprocessor chip as digital lcd, thus the utlity model has multiple function, as described below:

1. have four kinds of units of display: Foot-Pound (FT.LB), inchpound (IN.LB), Newton meter (N.M), and kilogram-metre (KG.M) can select for use above any one unit to show the moment values that applies, the unit of the current use of liquid crystal display.

2. have three kinds of working methods:

(1) direct mode: liquid crystal shows the moment that applies in real time, and this is suitable for the assembling of accurate non-repeatability.

(2) memory style: the maximum moment that applies in the liquid crystal display operation, this is applicable to monitoring.

(3) signalization mode: after choosing this mode, the user can incrementally be provided with moment values, the moment values that liquid crystal display is provided with, and when the actual moment values that applies meets or exceeds when being provided with, the buzzer sounding indicate luminously, and this precision that is applicable to repeatability is assembled.

3. system can measure zero point automatically, realizes the automatic compensation of null offset.

4. when the withdraw from service time reaches 2 minutes and 40 seconds, can cut off the power supply automatically.

5. drop to may influence precision the time when cell voltage, liquid crystal display " LOBAT ", indication must be changed battery.

6. set the dead band in the system, so that keep the stability of demonstration at zero point.

This spanner is telescopic torque spanner, and the user only need shake handgrip continuously, can realize both direction degree of tightness nut, and the degree of tightness direction can be set.

The design of spanner has guaranteed to be convenient to form the series of products of different ranges, the spanner of different ranges uses identical little process chip and circuit, as long as change other circuit parameter and frame for movement, available circuit can be realized four kinds of ranges: 15 kilogram-metres, 30 kilogram-metres, 45 kilogram-metres, 60 kilogram-metres.

In order to understand the utility model better, Fig. 4 A, Fig. 4 B disclose the software flow pattern of the utility model strain-type numeral demonstration sleeve torque spanner.

This spanner adopts strain measurement principle, and the foil gauge bonding also is sealed on the metal basis, do not exist cracked, dislocation, pollution/motion problem such as be obstructed, therefore, anti-vibration ability and all very strong to the adaptive capacity of environment.

The strain measurement principle is a kind of accurate dynamometry, this external system also realized zero point from motion tracking and compensation, the design of system and debugging have guaranteed that also left-handed to add moment consistent with the sensitivity that dextrorotation adds moment, so the measure error on the both direction is all 1%.

Automatic circuit break function can reduce battery consumption, but the low excessively indication guides user of cell voltage is in time changed battery, so that correctly use spanner, the setting in dead band can keep the stability of demonstration at zero point, and these give the user to greatly facilitate.

Claims

1, a kind of strain-type numeral shows the sleeve torque spanner, it is made up of driving end (1), connecting rod (2), wrenching bar (4), wrenching handle case (5) etc., it is characterized in that: foil gauge (3) is being pasted the both sides of connecting rod (2), circuit pulls (6) and battery (7) is contained among the wrenching handle case (5), detect torque signals by foil gauge (3), deliver to the little process chip CPU of monolithic again through amplifier, A/D converter and handle, deliver to digital lcd (9) at last and show.

2, show the sleeve torque spanner according to the described strain-type numeral of claim 1, it is characterized in that driving end adopts telescopic moment spanner, can realize both direction degree of tightness nut, the degree of tightness direction can be set.