CN2110864U

CN2110864U - Weighing apparatus for automobile load

Info

Publication number: CN2110864U
Application number: CN 92201870
Authority: CN
Inventors: 刘大立; 李炳光
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-02-01
Filing date: 1992-02-01
Publication date: 1992-07-22

Abstract

The utility model relates to a balance for automobile load, which belongs to a weighing device and is a metering device for the measurement of the load of an automobile. The utility model is composed of a sensor, an oscillator, a computer and a monitor. The utility model adopts a displacement sensor to measure the amount of displacement when a spring of an automobile plate loads (the amount of deformation). Accurate weight of the load can be obtained after data is treated by a microprocessor. The utility model can be installed on various automobiles without great change of the automobiles, and has the advantages of convenient installation and low price. The sensitivity is 10 kg; the precision is +-5%; the power source is an automobile battery; the weighting capacity is not limited.

Description

Weighing apparatus for automobile load

The utility model relates to a kind of measuring apparatus of measured automobiles dead weight capacity, belongs to weighing apparatus.

At present, the method for measured automobiles dead weight capacity is that automobile is reached the general assembly (TW) that pit scale weighs up automobile and load thing, deducts the nominal titre of automobile then, draws the weight of load thing.The pit scale price is expensive, can not move, and can not install everywhere, therefore uses to be restricted.Domestic do not see be installed on the automobile, can directly read the report of the measuring apparatus of automobile load weight.

The utility model is that a kind of manufacturing that provides in order to overcome above-mentioned shortcoming is simple, and cost is low can be installed on the various automobiles, and has the direct-reading automobile loading measuring apparatus of certain precision.

Principle of work of the present utility model is to utilize automobile when different loading, its loading laminated spring produces deformation, being directed at distance between forward and backward bridge of automobile and automotive frame has the principle of change in displacement, adopt electronic technology and computing technique, the change in displacement that loading is produced is converted into load thing weight and shows.Any automobile all is that car body is fixed on the automotive frame, and big roof beam structure is contained on the loading laminated spring, and laminated spring is fixed on the wheel shaft (forward and backward bridge).After the automobile loading, laminated spring is driven plain, thereby the distance between wheel shaft and crossbeam is changed.This automobile loading scale is characterised in that: substitute traditional pressure transducer with displacement transducer, and displacement transducer and oscillator are fitted together.Simultaneously, the detection signal that exports computing machine to by oscillator is a frequency variation signal.Because displacement transducer and oscillator are contained in the same shielding capsule, therefore can not be subjected to extraneous electromagnetic interference (EMI), what export is frequency signal, thereby can directly adopt counting or timing mode to obtain its frequency values and need not to carry out analog to digital conversion and improved measuring accuracy, simplify equipment, reduced cost.

Accompanying drawing 1 is a functional-block diagram of the present utility model.(1) is displacement transducer among the figure, is installed between automotive frame and the vehicle wheel shaft.It can be the variable capacitance sensor, also can be variable inductance formula sensor, respectively installs one on the loading laminated spring side of four wheels.(2) are oscillators among the figure, and electric capacity or inductance sensor are its oscillation circuits, and when electric capacity or inductance value changed with change in displacement, oscillation frequency also changed thereupon.Oscillator is contained in the shielding capsule of sensor.(3) be computing machine, it to oscillator output displacement--frequency signal is counted, and the curvilinear equation that frequency quantity obtains according to actual measurement is carried out computing and converts dead weight capacity to.(4) be display, it shows the dead weight capacity signal of computing machine output with charactron or LCDs.

Need to prove: for truck since the position difference of the thing of freighting in the compartment, though be same weight, the deformation potential energy of suffered power of laminated spring and generation is with difference on each wheel shaft.Simultaneously, between the deformational displacement amount of laminated spring and the dead weight capacity and nonlinear relationship, therefore for different vehicles, must measure the relation curve between laminated spring and the displacement earlier, and deposit computing machine in, by computing machine the frequency quantity that obtains is handled, and, synthesized the airlift of automobile potential energy (dead weight capacity) addition of four laminated springs.

Description of drawings: Fig. 1 is the functional-block diagram of automobile loading scale

Fig. 2 is capacitive sensor structure figure

Fig. 3 is oscillator circuit figure

Embodiment of the present utility model:

Displacement transducer (1) adopts capacitance type sensor, and its structure is an accompanying drawing 2.(5) are garden tubular pole plates in the capacitor among the figure, make by brass tube, (6) be outer garden tubular and plate, (7) are insulation courses, and (8) are shells, (9) be the internal polar plate holder of making of insulating material, (10) be fixedly termination of the external polar plate done of copper, (11) are that displacement is conducted and defended, and (12) are back-moving springs, (13) be the external polar plate location-plate, (14) are the oscillator printed circuit board (PCB)s.Interior electrode (5) and external electrode (6) are formed two electrodes of variable condenser, external electrode (6) connects together with lead-in wire with shell (8), to guarantee to have good ground connection, one end of external electrode (6) is installed with the displacement conduction and defends (11), it can withstand on the spring for motor car, also can be fixed on the vehicle wheel shaft (forward and backward bridge) by mechanical hook-up.Shell (8) is fixed on the automotive frame.When spring for motor car was driven plain because of loading, external polar plate (6) was headed in the box, and electric capacity is changed.

Present embodiment adopts integrated package NE555 to form RC astable oscillator (2) by standard circuit, sees accompanying drawing 3.Work as R ₁R ₂The aforementioned capacitive transducer of adapted when being respectively 100K Ω and 1M Ω, when displacement was 50 millimeters, frequency range was greatly between 8～16KHZ.Oscillator and sensor are contained in the same capsule, and this sensing oscillator capsule always has three external lines, that is: power supply+, power supply-(ground wire) and output line.

Computing machine in the present embodiment (3) adopt 8031 chip microprocessors, itself have counting, regularly, a plurality of input/output port, satisfy technical requirement fully.

Display (4) is selected for use according to customer requirements, and present embodiment adopts liquid crystal display.

Single-chip microcomputer and display are contained in the capsule, are fixed on the automobile instrument panel.

Single-chip microcomputer, oscillator, display all with automobile storage battery as power supply, automobile batteries is 12V, can be by 7805 power supply integrated package of pressure-stabilizing with voltage step-down and be stable at 5V.

The utility model has the advantages that handling ease does not need automobile is done any change, can be installed on the various automobiles, and is cheap, sensitivity is 10Kg, precision can reach ± and more than 5%.

Claims

1, a kind of automobile loading scale, by sensor, chromacoder and display are formed, and it is characterized in that:

1.. sensor adopts four position weigh sensors, is installed in respectively between automotive frame and four wheel shafts, and displacement is become electric capacity or inductance, serves as the loop element of oscillator (2), and is contained in the same shielding capsule with oscillator;

2.. chromacoder is made of oscillator (2) and computing machine (3), and oscillator adopts the RC astable oscillator, and the variation of dead weight capacity is transformed to frequency signal through oscillator and is defeated by computing machine (3) and carries out data processing.

2, automobile loading scale as claimed in claim 1, it is characterized in that: said displacement transducer is by interior garden tubular pole plate (5), outer garden tubular pole plate (6), insulation course (7), shell (8) and internal polar plate holder (9) and external polar plate fixedly termination (10) are formed, interior electrode (5) and external electrode (6) are formed two electrodes of variable condenser, external electrode (6) is electrically connected with lead-in wire and shell (8), one end of external electrode (6) is installed with a scale conductive bar (11), withstand on the spring for motor car, shell is fixed on the automotive frame, and when spring for motor car was driven plain because of loading, external polar plate (6) is headed into made electric capacity change in the box.

3, automobile loading scale as claimed in claim 1 is characterized in that: said oscillator (2) adopts the NE555 integrated package to form the RC soup device that shakes, and C1 be a weigh sensor, and when displacement was 50 millimeters, frequency range was 8-16KHZ.

4, automobile loading scale as claimed in claim 1, it is characterized in that: said computing machine adopts 8031 chip microprocessors.