CN2059983U

CN2059983U - Self-checking digital display apparatus for truck load

Info

Publication number: CN2059983U
Application number: CN 90210099
Authority: CN
Inventors: 范垂义; 潘润奇; 周建功
Original assignee: SHENYANG INST OF CHEMICAL MACHINERY APPLICATION
Current assignee: SHENYANG INST OF CHEMICAL MACHINERY APPLICATION
Priority date: 1990-01-24
Filing date: 1990-01-24
Publication date: 1990-08-01

Abstract

The utility model discloses a self-checking digital display apparatus for truck load, composed of a multi-vibrator, a displacement sensor, a phase-sensitive positive rectifier, an addition operation amplifier, an A/D transformation and a tribit semi-liquid crystal digital display. The displacement sensor of the display apparatus designs two upper and lower universal joints on the general displacement sensor, and fixes the displacement sensor between the truck frame and the truck axle through the upper and lower universal joints. The truck and other motor vehicles can measure the vehicle capacity conveniently after provided with the displayer, avoid using the weighbridge for checking weight, and improve the efficiency of checking weight and transportation. Besides, the self-checking apparatus for truck load can help the driver estimate capacity exactly, or is used as the equipment for again measure calculation of the weighbridge to reduce missdetection in the process of checking weight.

Description

Self-checking digital display apparatus for truck load

The utility model is a kind of electronic device that is used for automobile or other motor vehicles self check dead weight capacity.

Usually the weight of metering automobile or other motor vehicles load often adopts platform scale to check the weight, and this method needs the secondary weighing to automobile, promptly respectively carries out once after zero load and the load.Therefore this metering way not only bothers, and it is also more the possibility of flase drop to occur, and particularly at bigger goods, car is more, and the method that this employing platform scale is checked the weight especially seems time-consuming and inconvenient.This in addition way of checking the weight, the weight of the also difficult estimation of driver institute cargo causes to occur deviation when checking the weight the work efficiency that influence is checked the weight.

A kind of instrument that can the automatic gauge carload lot of the purpose of this utility model design is installed in it on the automobile, automatically the size of display automobile load, can remove from and utilize platform scale to check the weight, not only convenient, can save the plenty of time, also can help the driver accurately to estimate dead weight capacity.In addition, this self check load-carrying instrument also can be used as the metering outfit of reweighing goods on a standard scale to check for cheating of platform scale, reduces the flase drop that occurs in the weight testing process.

The utility model is to utilize such principle to realize, the principle that is directly proportional with dead weight capacity according to the distortion of vehicle body suspension leaf spring behind the carload, select for use displacement transducer to measure its distortion, according to the dynamo-electric principle of similitude its distortion is transformed into the electric analogy amount again, and then be input to totalizer and amplifier, after the A/D conversion, its result is demonstrated by display, and the arrangements of elements structure of the utility model automobile self check load-carrying digital indicator as shown in Figure 1.The schematic block circuit diagram of display instrument such as Fig. 2.

Fig. 1 is the arrangements of elements structural drawing of the utility model display instrument, among Fig. 1: 1, casing; 2, measure key; 3, display panel; 4, main circuit board; 5, multi-resonant oscillating circuit plate; 6, adjusting knob; 7, power supply box; 8, power switch; 9, supply voltage shows; 10, displacement transducer.

Fig. 2 is the schematic block circuit diagram of display instrument, and among Fig. 2: a is a multivibrator; B is a displacement transducer; C is phase depending on rectification; D is additive operation and amplifier; E is the A/D transducer; F is a display.By Fig. 1, Fig. 2 the utility model display instrument by multivibrator, displacement transducer, phase-sensitive rectifier, adder operational amplifier, A/D conversion and as a result display form, the circuit part of displacement transducer is formed electric bridge by differential type and multiturn potentioneter meter, electric bridge is by multivibrator supply high frequency power supply, its output signal is sent into the multiturn potentioneter meter after the positive rectification of phase sensitivity, adder operational amplifier is selected integrated package for use, can simplify the structure of instrument, A/D conversion of the present utility model in addition is the signal that aanalogvoltage is converted to direct driving display.Display of the present utility model is selected three and half LCD for use for reducing power consumption, and the dead weight capacity ton is equivalent to volt, shows 4,85 volts as display and is equivalent to 4.85 tons of load-carryings.

The important component part displacement transducer dividing circuit part of the utility model display instrument is outer also to comprise the mechanical measurement part, and Fig. 3 is its structural drawing, among the figure: 11,12 upper and lower universal joints; 13, sounding rod; 14, insulating sleeve; 15, inductance measurement pipe; 26, telefault.Be that displacement transducer is made up of telefault 26 inductance measurement pipes 15, insulating sleeve 14 and sounding rod 13, telefault 26 is on insulating sleeve 14, pack into then in the inductance measurement pipe 15 that steel pipe makes, sounding rod can be upper and lower mobile in insulating sleeve, feature of the present utility model is to be fixed with upper and lower universal joint 11,12 respectively on the inductance measurement pipe 15 of displacement transducer and the sounding rod 13, displacement transducer is fixed on automobile frame and is connected on the horizontal steel plate that is fixed on the vehicle by upper and lower universal joint 11,12.The upper and lower universal joint 11,12 that displacement transducer connects makes the not only relative displacement between energy measurement vehicle frame and the axle but also can adapt to mobile arbitrarily in the horizontal direction of displacement transducer.This displacement transducer can only be suitable for using on the front axle by the axletree of one group of leaf spring supporting or general wagon, and be on back axle, to form rigidity by leaf spring and auxiliary leaf spring combination support to be connected to general lorry rear axle, the displacement transducer that therefore is used to measure rear axle leaf spring and auxiliary spring deflection just must carry out with two groups of displacements commentaries on classics sensors.Fig. 4 is this structural drawing that comprises two displacement transducers, among Fig. 4: 16, main inductance measuring tube; 17, auxilliary inductance measurement pipe; 18, upper cardan; 19, guide pole; 20, guide frame; 21, main sounding rod; 22, auxilliary sounding rod; 23, measure plate; 24, lower cardan; H is the distance between auxilliary sounding rod 22 tops and the measurement plate 23.Main inductance measuring tube 16 is fixed on the vehicle frame by upper cardan 18 with auxilliary inductance measurement pipe 17, main sounding rod 21 lower ends are fixed on to be measured on the plate 23, guide frame 20 is fixed on the lower end of main inductance measuring tube 16 and auxilliary inductance measurement pipe 17, guide pole 19 be slidingly matched pass upper cardan 18 and guide frame 20 measure plates 23 be fixed on lower cardan 24 upper and lower universal joints 24 lower ends be fixed on the fixing horizontal steel plate of car back axle on.Auxilliary sounding rod 22 is compressed spring and pushes the lower end to, but leaving the distance of measuring plate 23 is H, auxiliary leaf spring was to the mean value of fore-stock and after-poppet distance when H was the automobile zero load, guide frame 20 and two upper and lower

universal joints

18,24 can adapt to vehicle frame under the effect of guide pole 19 and back axle moves arbitrarily in the horizontal direction, simultaneously can make inductance measurement pipe 16,17 measure the distortion of leaf spring and auxiliary leaf spring respectively again.The main inductance measuring tube 16 among Fig. 4 and the structure of auxilliary inductance measurement pipe 17 such as the inductance measurement pipe 15 among Fig. 3, promptly telefault on insulating sleeve, inserts the rear end insulating sleeve in the measuring tube equally.Each telefault has a tap, with coil two ends totally three end points, joins with three leads and end points, and the signal of responding on the telefault is input to display instrument.

Displacement transducer of the present utility model is fixed on the axletree or car back axle of vehicle frame and supporting steel plate spring, can measure the displacement deformation of leaf spring and convert the inductance signal to.Therefore on each leaf spring of automobile a displacement transducer should be installed all, when the supporting steel plate spring is made up of main steel plate spring and auxiliary leaf spring, then should select displacement transducer as shown in Figure 4 for use.Between the left and right leaf spring of car front axle and vehicle frame, a displacement transducer shown in Figure 3 is installed respectively as common lorry like this, and a displacement transducer shown in Figure 4 respectively is installed on back axle and vehicle frame.The inductance of each sensor is drawn lead and is pooled to display instrument by cable.This typical circuit diagram as shown in Figure 5.Fig. 5 is the circuit diagram that has the automobile self check load-carrying digital indicator of 4 displacement transducers (2 compound displacement transducers that comprise two inductance measurement pipes are wherein arranged).Among Fig. 5, L1, L1 '～L6, L6 ' are respectively the telefaults in the displacement transducer 1～6; D1～4th, diode is formed the positive rectification of phase sensitivity; W1, W2 are the multiturn potentioneter devices, wherein W1 is that each passage is output as zero when being used for regulating zero load, W2 regulates stiffness sensitivity, it be rigidity size adjustment according to each spring to corresponding sensitivity, be that 300Kg/Cm is transferred to 300mV/Cm with its sensitivity as rigidity; W3, W4 are potentiometer, and wherein W4 is used for arithmetical unit zeroing, and W3 is used for regulating the enlargement factor of arithmetical unit; IC1 is an operational amplifier; R is a resistance; G is the digital indicator that has the A/D transducer, can adopt three and half liquid crystal digital displays for reducing power consumption; K2 is a debug switch, K2 is put into test position after debugging W1, the W2 of each displacement transducer respectively; BG9-10 is that triode, C1～C3 are electricity, and B1 is the high-frequency coupling transformer, resistance R 1～R7, and BG9-10, C1～C3 and B1 form multivibrator; That the high frequency electric source that the secondary coil 1,1 '～6,6 ' respectively of high-frequency coupling transformer B1 produces multivibrator is added to electric bridge that telefault forms is corresponding 1,1 '～6,6 ' on; A+, a-, b+, b-, c+, c-are three groups of power supplys, utilize the diode displaying supply voltage, among Fig. 5 power unit are omitted.

The use of the utility model automobile self check load-carrying digital indicator is:

1, displacement transducer is installed on the fixed mount of motor spring top, the cable plug of sensor is inserted the input end of display instrument;

2, the power switch 8 on the unlatching display instrument panel, after treating instrument stabilizer, display was zero when adjusting W1 made zero load, regulating W2 makes rigidity be transferred to corresponding sensitivity, regulator potentiometer W1～W4 of the present utility model is installed on the automobile at display instrument and seals after the disposable adjustment in back, and regulator potentiometer all is to be arranged in the casing of casing 1;

As long as press when 3, using and measure key 2, numeral (unit volt, expression ton) can appear on display panel.

Fig. 1, Fig. 3, Fig. 4 and Fig. 5 can be used as an example of the present utility model.In addition, the utility model removes and to be used for automobile, can make things convenient for, detect rapidly outside the weight of institute's load, also this display instrument can be installed on other motor vehicles, and for example tractor, trailer etc. are as the measuring instrument of self check dead weight capacity.

Claims

1, a kind of motor vehicles self check load-carrying digital indicator, it is characterized in that this display instrument is by multivibrator, displacement transducer, the phase sensitivity positive ion deterioration, adder operational amplifier, A/D transducer and result's numeral display group become, displacement transducer is formed electric bridge, electric bridge by multivibrator supply high frequency power supply by differential type and multiturn potentioneter meter, its output signal is sent into the multiturn potentioneter meter behind the phase sensitivity positive ion deterioration, the gained signal is after summing amplifier amplifies, be transformed into the digital indicator signal through A/D, make digital indicator demonstrate the result.

2,, it is characterized in that digital indicator is three and half LCD according to the described display instrument of claim 1.

3, according to the described display instrument of claim 1, its displacement transducer is made up of telefault, inductance measurement pipe, insulating sleeve and sounding rod, it is characterized in that being fixed with upper and lower universal joint 11,12 respectively on the inductance measurement pipe 15 of this sensor and the sounding rod 13, by upper and lower universal joint 11,12 with displacement transducer be fixed on vehicle frame and the horizontal steel plate, horizontal steel plate is fixed on the axletree.

4, according to claim 1,3 described display instruments, when it is characterized in that support spring steel plate for axletree is combined into by main steel plate spring and auxiliary leaf spring, displacement transducer changes sensing by two groups of displacements and forms, this sensor is by the main inductance measuring tube, auxilliary inductance measurement pipe master sounding rod, auxilliary sounding rod, guide pole, guide frame, measure plate and last, lower cardan is formed, main, auxilliary measuring tube 16,17 are fixed on the vehicle frame by upper cardan 18, main sounding rod 21 lower ends are fixed on to be measured on the plate 23, guide frame 20 is fixed on the lower end of main inductance measuring tube 16 and auxilliary inductance measurement pipe 17, guide pole 19 is slidingly matched and passes upper cardan 18 and guide frame 20 and be fixed on the lower cardan 24 measuring plates 23, lower cardan 24 lower ends be fixed on the fixing horizontal steel plate of car back axle on.